Vertical Vibration Concrete Pipe Machine Productin Manual

vertical vibration concrete pipe machine

How Does Vertical Vibration Concrete Pipe Machine Works?

vibrator
vibrator for vertical vibration concrete pipe machine

Vertical Vibration Concrete Pipe Machine uses half-dry concrete as aggregate, the mandrel vibrator and inner mold vibrating together to form the pipes vertically. There are eccentric blocks inside the vibrator located in the inner mold. These blocks rotate in high frequency to generate vibration and the force of vibration passes to the concrete through the inner mold.

There are 3-4 eccentric blocks in the vertical vibration machine along with the vertical shaft. The vibration force generated by the rotation of blocks is right-angled with the axis of the concrete pipes. This force is circumference vibrating, it likes a vibrator which diameter equals to the inner diameter of the pipe, vibrating continuously and form the concrete into shape.

 

This method is done by the machine to reduce the adhesive property, internal friction, and the engaging force of the particle from the mixed concrete. Along with all these things, it also helps to form a filing structure and to compact the concrete to a high-density level for gaining expected strength and other specifications.

During the process of manufacturing, while adding concrete, the pipes are compacted by vibration force. The upper end of the pipes is made with the vibration force and the hydraulic press force by the joint forming plate. It helps to give the upper end of the pipe a good density, higher strength and good dimension accuracy.

The mold could be removed vertically after production without curing them. The subsidence could happen to the concrete pipes before the initial-set, and they may deform easily, especially the upper end of the pipes. So we should strictly follow the manufacturing technology to make sure that the finished pipe could bear the gravity, and the deformation would not be greater than the tolerance. To ensure the accuracy of the upper end of the concrete pipes, it should be protected with steel or GRP header during the natural curing.

Tired Of Long Article?

What is good of this vibration concrete pipe machine?

● This machine is automatic and maintains a high mechanism. With its high frequency, it has helped a lot to save labor time. Keeping this machine in hand, this industry has turned itself from being labor-intensive to a fully technical manufacturing.
● Adjustment of vibration is solely dependent upon the dimension of concrete pipes. So the making of high quality of concrete pipes has become a lot easier.
●Traditional machines, like the horizontal concrete pipe machine, used to have more than one mold for each of the sizes. But this revolutionary machine uses only one mold for each size. Thus the concrete pipes made with this machine are highly accurate in nature.
● This machine is totally Eco- friendly as it has decreased the usage of cementing materials. And half-concrete is really cost effective in comparison to the traditional materials.
● The strength and density of the concrete pipes made with this machine are undeniable. Additionally, the water absorption cannot be more than 6%.
● With only one mold for each size, Vertical Vibration Concrete Pipe Machine has not only reduced the investment expenditure, rather it has made the machine highly efficient for mass production and urgent projects. Now, the number of molds cannot limit the output.
● This machine makes use of natural curing process (30-40℃) which helps to save energy.
● The machine is a multi-tasking one. For example, it can make pipes with basement as well as it is an expert in the making of other non-circular pipes.
● This machine is a savior to the environment.
● It can also produce lining pipes such as pvc lining concrete pipes, steel lining concrete pipe and GRP lining concrete pipes.
● It requires less equipment for the making of pipes. And it has also shortened the processing time of pipes.
● This machine can successfully manufacture pipes with the diameter bigger than 2400mm.

XBKT$SHB9B8R[X[QNFJ_TOV

Tired Of Long Article?

Bothered by the air-pocket? Here is the solution!

Why there are air-pocket on the surface of pipes made by vertical vibration concrete pipe machine?

The vibration compacting process uses the vibrator for generating vibration and then passing it to the mixed concrete. During this process, the particles of the mixed concrete come closer to each other which extrudes the air out of the concrete. Thus air bubbles come out to the surface of the concrete as well as the surface where the steel molds got attached with the pipes. These air pockets worsen the look of the pipes.

The bubbles which raise up to the surface of concrete are the ones having a specific diameter. On the other hand, the other bubbles, which cannot conquer the conflict with their buoyancy force, remain inside the concrete and thus form the air pockets inside the pipe body.

Now, the question arises, where does the air come from?

The air not only comes from the concrete batching, delivery and filing process; it also comes from the air absorption during the vibration force. How much air gets absorbed into the concrete depends on the vibration technology, which matters a lot to the quality of finished concrete pipes.

The volume of air absorbed into the concrete is depends upon the vibration frequency, the vibration amplitude, and also the mixed concrete matters.

  1. During the vibration compacting, the higher vibration amplitude results in more air absorption.
  2. During the vibration compacting, the higher vibration frequency results in less air absorption.
  3. The longer will be the time of vibration, the more air will be
  4. The worse will be the surface adhesive between concrete and mold, the more air will be absorbed.
  5. The looser the concrete, the more air is absorbed.
  6. The more Viscosity of the concrete, the more air is absorbed.

Solution to the problem.

The most efficient way to decline air absorption while making pipes with half dry concrete is to use the high vibration frequency in lower vibration amplitude, and make the vibration time as short as we can.

Is there any test could support our theory?

We made a test that can completely approve our theories about the influence of vibration frequency to the concrete density.

The tests used same vibration force, same aggregates, but four different vibration frequency to make concrete pipes. We took 3 samples from the top end of the pipe, the middle of the pipe and the bottom of the pipe, and made a water absorption testing. The results are shown below:

84`}}35)T47UK)L4WNV79L2

From the test above we can learn that:

● Concrete pipes made by Vertical Vibration Concrete Pipe Machine have different water absorption from top to bottom which also becomes less from top to bottom.
● The water absorption in the middle and the top of the pipe body becomes lower with improving the vibration frequency; while the bottom of the pipes vibrates for long, the vibration frequency becomes less effective to the water absorption.
When the vibration frequency is at 4166rpm, the water absorption of middle pipe and the bottom pipe become higher; it is proved that after the high-frequency vibration, the middle section of the pipe becomes completely compacted. Increasing the vibration time does not improve the density of the bottom section of pipes continuously. So, we could use the variable concrete-filling-speed during the production, accelerate the speed of fill concrete when filling the bottom of the pipe and increase the volume of filling concrete, in order to reduce the vibration time of the bottom of the pipe. Slow the concrete filling speed gradually from downside to up to increase the vibration time of the upside concrete pipe, then to balance the density of the concrete pipe from downside to upside.

Tired Of Long Article?

The requirement to the concrete manufacturing concrete pipe by vertical vibration machine

When Concrete pipe is made by Vertical Vibration Machine, mold could be removed instantly after production, and it could even be cured without mold (with other machines like spun pipe machine, the pipe have to get cured with the mold). Without the support of the mold, the concrete pipe will deform under the gravitational force until and unless it becomes solid. So in order to prevent the pipe from deforming, the concrete must have enough cohesiveness, the finished concrete pipe will have the ability of self-supporting to bear the gravity without deformation.

From the above, we can learn that the cohesiveness of concrete is very important. From the selection of aggregate to giving it the right proportion - all the steps should aim to improve the cohesiveness of concrete. And the compression of vibration could guarantee the concrete to have sufficient cohesiveness too.

The technology of vibration concrete pipe machine uses high-frequency vibration to make the concrete particles moving, filling the mold and compacting; the upper end of the pipe takes its shape by hydraulic compressing and vibration force. So the concrete for vibration machine should be dry which is suitable for both vibration and hydraulic compacting. The well-designed concrete for vibration machine is easy to compact to the right shape, and has the good cohesiveness, and it will also have fewer air pockets. The end of the pipe is easy to compact to the designed shape in 2-3 mins without air pocket and appearance of stones.

According to your experience and test, the specifications of concrete are below:

  1. Water cement proportion

Water cement proportion is very important for the mixed concrete, and it matters a lot to the workability. The vibration technology requests the concrete to compact firmly during vibration for higher density; meanwhile, the concrete should be half-dry with no lumps; it could get squeezed to clumps by hands and could be collapsed when you will touch them. Usually, the water-cement ratio is 0.36-0.39

  1. Volume of cement

The volume of cement affects the bonding strength of aggregate. Improving the volume of cement within certain limits could also improve the strength of concrete along with the workability making it easy to liquefy and flow. But the usage of too much cement will not improve the strength, rather it will increase the cost.

Usually, the cement volume for C30 standard concrete is 320-370 kg/ m; the cement volume of C40 standard concrete is 340-380 kg/ m³; the cement volume of C50 standard concrete is 360-400 kg/ m³. If any chemical or other mineral additives are used in the concrete, the volume of cement could be reduced accordingly.

  1. Sand percentage

The sand percentage is the main factor to the cohesiveness and workability of the concrete.

Usually, the proportion is 0.40-0.48.

  1. The volume of sand and stone

The aggregate grading and sand percentage is the main factor to the workability of half-dry concrete. The aggregate grading should be strictly controlled during the production to get high quality and well-designed concrete product while reducing the consumption of cement.

In the production, we should adjust the proportion and aggregate grading according to the aggregate quality, seasonal climate and the dimension of pipes, to meet the required quality.

Quality of mixed concrete has a significant influence to the vibration concrete pipes. Controlling the quality and stability of concrete are the most critical, so it’s better to keep all the material quality stable and it's also better not to change them frequently.

Specification of Vibration Process

The structure of half-dry concrete is very loose. During the vibration and liquify process, the tiny space gets fulfilled with small particles and the concrete become compact squeezing most of the air out of the concrete. The vibration have to be strong enough to let the particle’s move speedily up to the specific limit of velocity to liquify the concrete for getting the ideal compaction. Whether the concrete could liquify or not, depends upon the frequency and the amplitude of vibration, and the other specifications like the quality of cement, water cement proportion, the surface of aggregate, and the aggregate grading, temperature etc.

There is very little cement paste in the half-dry concrete. Low-frequency vibration is not enough to liquify the concrete and make the half-dry concrete flow and full fill the pipe mold. So we have to adopt high frequency and strong vibration to liquify the concrete, and make it flow and get compressed to the designed density.

In the concrete pipe making the process by vibration machine, the diameter is from 15mm to 25mm; the most abundant amongst them is 15mm; If the diameter of sand is within 5mm, take the diameter of aggregate and the energy decrement of concrete into consideration, to make the dry concrete liquify. The most proper annular rotating vibrations should be more than 6000 rpm.

 

The quality defects may happen to vibration concrete pipe machine and the resolutions

The main quality defects that happened to vibration concrete pipe machine is that the rough surface and the air pockets on the appearance, the pore space inside the pipe body, and the crack of upper end of the pipes. But if we operate the machine properly with gentle care and make the mixed concrete for the production accordingly, all these defects can be eliminated from the machine.

Solutions to quality defects:

1.Make the mixed concrete strictly according to the standard and guarantee the workability of the concrete.

When the mold is released from the concrete pipes, during the curing process, the subsidence could happen to the pipes and cause the pipes to deform. The main reason of this being:

  • unstable lifting and striking happened to the mold and pipe during the mold release process.
  • the bottom ring and pipe are not completely vertical to the ground.
  • pipes are too tall and thin.
  • too much water in the concrete.

In order to avoid these defects, stable demoulding is a way to protect the pipe from impacting. Make the ground surface flat enough, and use the accurate dimension of mold. This process is to make sure about the high workability of mixed concrete.

Self-support is an important specification to guarantee the accuracy dimension of concrete pipes. The volume of water for mixed concrete should be adjusted according to the dimension of pipes, material, climate.

2.Adequate vibration

Vibration force is the main force to form the concrete pipe. Vibration specification should be adjusted according to the dimension of pipes, and the quality of concrete to acquire higher density, high strength with the perfectly finished product.

3.Coordination of concrete filling and vibration.

Vibration machine uses the rotating belt to fill the concrete while vibrating; the vibration and concrete filling should be coordinated. The vibration specification should be adjusted according to the dimension of the pipe which is being produced; meanwhi,le adjust the concrete filling speed and the volume.

If filling the concrete becomes too fast, the concrete will not be liquified and full fill the pipe mold; the air will not be squeezed out of the concrete because of the continuous process going on and on. The cement paste could not fulfill all the space among these aggregate. And the hole formed inside the pipe body causes the low density and strength of the pipe.

In order to solve this, the concrete filling speed should be different from bottom to top; fill faster in the bottom, while slow down gradually from bottom to top. This helps to completely compact the concrete and improve the producing time circle.

Improve the frequency of vibrator to 6000 rpm or more, to improve the density, strength, and reduce the air in the concrete as less as possible. It will also help you to save energy, shorten the production time circle and improve the efficiency.

4.Time of starting vibration

The vibration concrete pipe machine uses the technology of inner mold vibration which lasts for the whole concrete filling process. The obvious consequence of this is the bottom of the pipe vibration being more than the top of the pipe; and the bottom may even over-vibrate while the top may experience lack of vibration. So, depending upon the specification of the concrete pipe and the vibration of the machine, start the process and fill up about 1/3-1/4 of the pipe mold.

If we start the vibration early without material, the noise will be loud and the vibrator as well as the mold can break anytime by the powerful vibration. on the contrary, If we start the vibration too late, the air in the bottom of the pipe will be hard to squeeze out, and too much air will remain in the concrete while forming the air pockets, holes, and reduce the density of the whole pipe.

5.Hydraulic Pressure

Unlike the bottom of the pipe, the vibration for the top of the pipes are not that longer. In order to improve the density, strength and form the joint of pipe, we use hydraulic pressing while vibrating. During the operation, the pressing should be slow and gradual avoiding any sudden press force to the top of the pipes.

6.Curing process

The main character of vibration pipe machine is that

  • Using half-dry concrete
  • Removing the mold instantly after production.

So the concrete pipe made by vibration machine requires more attention during the curing process after production. Protective-header must be set on the top joint of the pipe after removing out the mold. Cover the pipe with the plastic cover to prevent water from steaming away. Natural curing and steam curing are the options according to the climate and temperature.

7.Quality of steel mold

The vibration force of vibration concrete pipe machine is passed to the concrete though the steel mold; so the steel should be of good quality, light-weight, and should have good resilience power.

The design of steel mold is quite important

  • The reinforced bar of outer mold should be in the right quantity and well-designed position
  • The steel should be of lightweight and have good resilience power in order to make the concrete liquified by the most efficient vibration, to guarantee the uniformity of the pipe quality.
  • The dimension should be accurate as designed, and should be leak proof.
  • The surface of mold should be smooth enough, the welding line should be polished with no dent and accurate dimension. Make the cone with a diameter of 3mm to guarantee the mold to be removed smoothly without resistance.

8.Installation of the machine

The installation of vibration pipe machine has significant influence to the vibration efficiency. The foundation should strictly abide by the designs, to guarantee the accuracy of the machine and the vertical of mold.

Precast Concrete Manhole Design and Manhole Making Machine

manhole making machine
High frequency vibrating manhole well production line
Double station manhole well equipment production line
Operation simple, Highe versatility, which could produce round manhole, rectangular manhole, U channel, concrete pipes etc all kinds of shaped precast proudcts.
Round manhole well

Concrete manhole with base: the base is precasted together with manhole body, reduced the lifting work during installation, but not very convenient to install.

manhole with base
Square manhole well
422558994865918462
422558994865918462

Joints of Concrete Manhole

Joints between the manhole elements are almost the same with concrete pipes, there are flat joints, as well as male & female joints. The seals for the gap are cement plaster, factice, and rubber seal.

joint of manhole

Concrete Manhole Manufacturing

There are ways to manufacturing concrete manhole, by dry cast vibration machine and wet cast manual mold. are the most common two methods.

 

concrete manhole mold

Wet Cast Manhole Mold

Wet cast manhole mold uses the steel mold to manufacturing precast manholes, using wet concrete as aggregate, the finished manhole will cure inside the mold until it becomes solid to remove the mold. This mold is suitable for Low-Rate Initial Production.

manhole making machine

Automatic Concrete Manhole Machine

Concrete manhole machine uses dry concrete as aggregate, and with the high-frequency vibration force, the finished manhole product has high density and strength, the mold could be removed instantly after production. This machine is suitable for mass production.

Want To Learn More?

Things You Should Know About Vibration Concrete Pipe Machine

One of my client Antonio from the Philippines came to inspect our pipe machine yesterday, the process he producing concrete pipes currently is using the manual mold, the reason he wanted to update his concrete pipe plant is to improve the efficiency.

On our way drive back to the factory from the airport, he said that Pony, I have learned so much about all the machines on the web, but there are so many types, how can you help me to work out the best solution?

There are types of machines outside there on the market indeed, but our purpose is to improve the daily output at the meantime, get qualified pipes with high density and strength of the civil project and selling.

In order to help him to wok out the solution for her requirement, I made some points that help him to make his option.

The first machine he requested is the horizontal concrete pipe machine

spinning concrete pipe machine

The horizontal concrete pipe machine has a long history, and widely used for its simple structure and operation. With the half-dry concrete as material spinning inside the mold to form the shape.

cocnrete pipe mold

The quality of pipe made by this machine mainly based on the skill and experience of the operator, the density and strength is lower than other pipes made by other machines. The main flow of pipes during the making process is that the steel cage may go deformed during rotating of mold; and the thickness may be thicker than designed, that because the pipe forms under the spinning force and the pressure between roller and mold, if we filling moderate concrete, the pipe is not completely compacted by roller and cause the unexpected quality, if we filling more concrete, the pipe could be compacted completely, but the thickness may more than we designed.

concrete pipe mold

Invest for this machine seems lower than other equipment, but we need multiple molds for each size to meet the daily output, as the mold cannot be removed until the concrete become solid.  As experiences, machine with multiple molds, the investment may equal to the vibration pipe machines.

The other issue you may take into consideration is that if the mold and the machine are not made inaccurate dimension, the machine and mold bounce a lot during the production, that could be a potential bomb to the safety of operators.

 

After the brief introduction of the roller suspension concrete pipe machine, Antonio said that, pony, I’m outdated using the manual mold, I don’t want to invest in another traditional facility once again. Please give more introduction of the vibration machine.

The next one I introduced to Antonio is the double shifts vertical vibration concrete pipe machine.

Vertical concrete pipe machine

double shift concrete pipe machine

Using the core mandrel vibrator to generate high-frequency vibration force to form the pipe into shape. The 6000rpm vibration frequency and powerful force is strong enough to liquefy the concrete during production, and make the particles of concrete full fil space between aggregate to acquire the high density and strength, which are very important for the durable of concrete pipes. With the central control panel and electric chart for delivering pipes, only two operators could run the whole production plant.

Antonio asked me why the 6000 rpm so important? Other companies vibration frequency could up to 3000-4000, are there any differences?

This is a technical issue some of the pipe machine user may ignore when they inspect the machine. The appearance of the machine and mold is quite obvious to see and check, but the frequency, its hard to tell until you actually operate the machine.

Why exactly high frequency like 6000rpm important? The diameter of aggregate we use during the production is 5-25mm, and most of them are 15mm particles, some sand particles are even within 5mm. take the range of the diameter of aggregate and the energy decrement of vibration force into consideration, 6000rpm is the best to liquefy the concrete and get the high density and strength concrete pipes. If the vibration frequency is less than 6000rpm, it's not strong enough to liquefy the concrete, and the small particles can not full fill all the spaces of the concrete, that’s the reason why there are so many air pockets on the surface of the pipes and the water permeability is too high.

I also showed this chart to Antonio to help him compare all these concrete pipe machines.

Machines Quality of pipe Appearance of pipe Efficiency Eco-friendly Cement consumption Energy consumption
Centrifugal pipe machine Good Good Low Low High high
Horizontal pipe machine Medium Medium Medium Medium Low high
Manual mold Good Good Low Medium Medium low
Vertical vibration machine good medium high High low medium
Radial press machine Medium meidum Very high high low medium

After these detailed introductions, Antonio know which machine to choose as well as we all know.

Let me know in the comment if you have any questions.

Need Free Design & Consultation?

Can your vibration machine liquefy the concrete?

Liquefaction is an appearance during the compaction of dry concrete when making concrete pipes with vibration. Liquefaction is a process that airs are expelled out of the concrete, and the aggregate of concrete is compacted together firmly.

Why is liquefaction so important for making dry-precast concrete products by vibration machine? During the liquefaction, the extra air is expelled out of the concrete, and each element of the concrete are compacted and bonded with each other in high level. The mortar produced during the process could full-fill tiny gap and space, that enables to increase the strength and the density, as well as the low-permeability.

What is liquefaction looks like? Have you ever boil waters? The air bubbles keep coming out of the surface the of water. Liquefaction of concrete looks like that. But the difference is, liquefaction is a temporary scene when most of the air is expelled out of the concrete, the air bubbles are less and less visible.

You may wonder that liquefaction is very common in wet precast, but dry concrete? Not sure.

However, liquefaction happens in dry concrete too. The vibration is matters a lot for the appearance of liquefaction. Try to adjust the vibration to high frequency (5000-6000rpm) and low amplitude (close to the self-amplitude of concrete), you will get a perfect finish concrete product.

You may not tell the differences of machines whether they can make the concrete liquefy or not. But the finished concrete product won’t lie.

The concrete product that has been fully compacted and liquefied by high-frequency vibration has a smooth surface and visible density, while the one hasn’t been produced in this way came out with a surface full of pores.

concrete product hasn't been completely compacted.

concrete pipe with pore

concrete product has been fully compacted and liquefied

smooth surface

How exactly the liquefaction looks like? Alright, I took this video, not professional, but I think it’s enough to tell.

Concrete Pipe Manufacturing Process (Vertical Vibration Machine)

DESCRIPTION OF VIBRATION CONCRETE PIPE MACHINE MANUFACTURING PROCESS

Vibration concrete pipe machine has features of highly mechanized, high density of finished pipes, good and surface, and quickly mold releasing. But you may wonder what the making process of this machine? Is it suitable for your current plant? Here are the details.

This simple chart could help you to understand how the machine process. And the process below helps to check all details.

flow chart

1. Clean the bottom ring, and the rings should be coated with mold release (you can use wasted engine oil instead of pro mold release)

bottom ring

2. Sit the out mold on to the bottom ring.

concrete pipe mold

3. Put the out mold into the working pit.

concrete pipe mold and hook


4. Start the feeding machine, and adjust the volume of concrete according to the dimension of pipes. Start the vibrator after the concrete fills about 50cm height of the mold. Vibrating while feeding concrete.

concrete pipe machine feeding

5. Feed the concrete to the top of the mold, start the hydraulic of pressing while vibrating, to form the joint.

concrete pipe joint forming

6. Lift the out mold and pipe out of the pit, delivery to the curing area.

concrete mold with pipe

7. Put the glass fiber or steel pallets on to the top of the pipe to protect the joint during the curing.

8. The pipe could self-cure with the heat of hydration of cement. And cover the pipe with plastic cover would help with the curing process.

concrete pipe curing

9. Product testing.

How To Make Dry-cast Concrete Pipe With Machine

Companies in brick manufacturing, mining, civil engineering, and contractors start involving into making precast concrete pipes for new business development. As beginners, you may wonder what kind of equipment would be appropriate for making concrete pipes. As dry casting plays a significant part in precast industry, I’m going to introduce several machines which are commonly used.

The first one, roller suspension machine.

roller suspension pipe machine

Invented by engineer Roberston and Clark in 1943 in AU, the pipe forms under the pressure of the roller and the spinning force. This machine is popular for its simple structure and low investment. But as we can’t remove the mold instantly after production, we need a huge number of molds to improve the daily output. Does this sound cost-saving? You do the math.

The second one is the vertical vibration casting machine.

vertical vibration pipe machine

Invented by Pedershaab in Denmark. As the concrete forms into shape under the high-frequency vibration force of vibrators, the strength is excellent and mold can be removed immediately after production. It can also be used to make pipes with lining and irregular concrete products.

But the frequency of vibrator and the proportion of concrete are quite matters to the quality of finished product. Equipped with robotization facilities, the machine can be operated full-automatically.

 

The third and the last I want to introduce is Radial Press Concrete Pipe Machine

Developed by McCracken in 1940, with the rollerheader rotating in high speed, it forms the concrete in high frequency. The whole production plant can be designed to three shifts or more to meet mass production. The high investment of this machine is not the only reason why people take it as a second option. As it is not appropriate to make irregular product and pipe with lining.

And the wire cage may go deform during the spinning of the header.

 

Ways to reinforce the ends of concrete jacking pipes

Due to the partial compression during the jacking process, the ends of jacking pipes are easy to go deformed laterally and become damaged. So the bearing capacity of the ends of jacking pipe should be reinforced. U shape hooping and more latitudinal reinforce wires should be used at the 200mm-300mm ends of the pipes.

The out layer of latitudinal wire should be the priority when doing the reinforcement. After the reinforcement, the span of the latitudinal wires should be 1/3-2/3 of ones on the pipe body. The reinforced u shaped hooping should be equal with the longitudinal wires of the pipe.

You may wonder how we decide the span of latitudinal wires and the length, there are five factors may help you to figure it out:

1.Jacking distance 2.geological conditions of the project 3.drivage (machinery or manually) 4.expirence and skills of the operator 5. straight jacking or curved jacking. The reinforcement should be stronger when factors above are unfavorable.

During the jacking process, the pipes forced stress not only from Poisson’s effect but from the superposition of the deviation as well. Like the picture below: the end faces of the pipe is transmitting the pressure point to point instead of end to end, so the ends of the jacking pipes are very easy to collapse and break.

The end reinforcement in long distance jacommentpe project like the diagram below, the inner and outside wall is covered by the steel ring, the thickness of steel should be 4-8mm, and length from 120-200mm.

reinforce the ends of a concrete jacking pipe

Different reinforcement for different joints of jacking pipes:
reinforce the ends of concrete jacking pipes

reinforce the ends of a concrete jacking pipe

Leave a comments if I was wrong in this article. Thanks.

What Is Concrete Pipe Making Machine And Its Function?

concrete pipe machines

The development technology has reached the highest level where one can find solutions for everything. While concrete pipe making process was going through some difficult time concrete pipe making machine came into the market and saved the time. Earlier a lot of time was consumed to make it in a customized manner but this technology made the whole manufacturing a smooth process. This machine is versatile in approach as well which can enable table vibration or central core vibration and has Falcon control.

The concrete pipe making technology avails various optional features that can be installed in this concrete pipe machine in order to improve production value. It is great for handling machine easily that are swivel automation for swivel arm and concrete feeder which also includes vibrator and swivel arm, pendant switch for operation of concrete feeders, hydraulic pressing/rocking function, stationary control panel, R4 headers, lifting hole equipment, top ring system and much more. This vertical cast concrete pipe machine is a manually operated machine and thus, it can manufacture high-quality box culverts, concrete pipe, and complete manhole systems.

Designed with the state-of-the-art components, it is suitable for all types of concrete pipes of different shapes and sizes. Concrete pipe making machine can also make circular and non-circular pipe with “bell” or in-wall joint, reinforced and non-reinforced pipe, lined pipe, box culverts, jacking pipe, manhole risers, base sections, cones and cover slabs. It can enable versatile productions of pipe, culverts and complete manhole systems of up to 1500 mm in diameter for circular units and up to 1500 x 1500 mm for square units. Though the capacity of this machine depends on the kind of concrete pipe being produced, with the help of this machine all concrete pipes and manhole systems are manufactured with an inner lining of PVC, PE or GRP with special mold attachments.

Bothered by air pockets on the surface of concrete pipes? here is solution

Yesterday, one of my friends Chandrakant told me he is upsetting by the air pockets (or more) on the surface of the concrete, like pictures below.

Adjust the vibrator to high frequencies like 6000rpm instead of 4000rpm, and low amplitude instead of high, let's see what happened.

You may try when your users are critical to the surface of pipes.