Construction technology of the hottest pipe jackin

2022-08-19
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Pipe jacking construction technology

pipe jacking construction refers to the construction process of jacking steel pipes (including multi section steel pipes) or concrete pipes from point a to point B with hydraulic power without digging trenches on the surface. Our company has formed this construction technology after many engineering practices

process characteristics and scope of application

1. Pipe Jacking under the road, and the road is unblocked

2. Pipe Jacking under the building does not affect the use function of the building

3. Shorten the pipeline laying cycle and significantly reduce the project cost

4. Single equipment and simple operation

5. The pipe joints of the pipes used in this process to measure the output must be qualified products produced by national designated manufacturers

6. It is applicable to the construction of railways, highways and underground pipelines that are difficult or unsuitable to excavate grooves

process principle and process flow

open laying pipeline is changed to use machinery as power to transfer the pipeline from point a to point B under the surface

construction preparation - measure the elevation and axis - dig the jacking Work Pit - lay the jacking guide rail - set the jacking back - install the jacking equipment and lift the pipe joint - excavate and jacking - measure and correct the deviation - excavate again (soil in the pipe) jacking - measure the circular operation to complete the right angle tear sample

main mechanical equipment: hoisting equipment, high-pressure oil pump, large tonnage jack, back pile and back beam, guide rail and unearthed tools, theodolite, level gauge. The function and quantity of machines and tools depend on the diameter, length and weight of the jacked pipe joint

key points of construction

1. The excavation of pipe jacking work pit shall be carried out in accordance with the construction scheme and specific environment. The length and width of the pit shall depend on the soil quality, the diameter and length of the pipe jacking section, machines and equipment, pipe laying and excavation methods. In addition to installing the back of equipment, guide rail and jacking pipe joint for pipe jacking, the working pit is also conducive to the operation of personnel who are not much different from the excavation and operation of relatively expanded polystyrene board outside the pit. Generally, the front edge of the upper opening of the working pit is ≥ 2m away from the curb. After the pipe joint is placed, there should be a 1m working surface on each side. The space between the rear side of the pipe joint and the jack should be conducive to excavation. In a water environment, water pits and drainage facilities should be set up. The slope coefficient of the working pit wall should meet the requirements according to the soil conditions, and the pit bottom should be compacted

2. The guide rail consists of four steel rails and oil cylinder. Stroke: 250mm; It is composed of several sleepers. The sleepers are placed on the foundation soil with the height of 1/2 of the sleeper under the bottom of the working pit. The sleeper spacing is 800-1000mm. The length of the steel rail is equal to the length of the bottom of the working pit minus the position occupied by the steel rail pile. The spacing of the steel rail depends on the outer diameter of the pipe jacking joint. Generally, it is necessary to ensure that the lower skin of the pipe joint is 20mm higher than the sleeper epithelium after the pipe joint is installed. After the jack is installed, it is necessary to have the largest contact surface with the cross section of the pipe joint, and the steel rail installation should be straight, The front head should have 0 0% slope

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