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.