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Liaoning Xingcheng cable pipe jacking trenchless laying unit

Liaoning Xingcheng cable pipe jacking trenchless laying unit

article source: Shengyue pipeline release time: 09:37:11

product brand Shengyue pipeline product model T45 production City Hebei shipping City Langfang total supply 100000 minimum starting order 100 product unit price 100 UOM product details

Liaoning Xingcheng cable pipe jacking trenchless laying unit

pipe jacking Construction technology is a kind of pipeline burying construction technology with no or less excavation. Next, we will introduce the process characteristics and applicable scope of pipe jacking construction

characteristics of pipe jacking construction process:

1. Pipe jacking construction technology can reduce noise, reduce dust, and reduce interference and damage to urban traffic conditions and environmental conditions. It is a real pollution-free and efficient construction technology

2. Obstacles can be crossed. If the construction center line of the project is located in the green belt, and most of the green belt are tall and straight trees, if slotting construction is adopted, all of them need to be removed and replanted, and the cost is high

3. Little interference to traffic. The construction surface is reduced from line to point. The floor area is small, and there is no need to cut off traffic

4. Low noise and vibration. Construction in the city has little impact on the living environment of residents, and will not affect the use of existing pipelines and structures

scope of application:

1. Ensure that the pipe jacking under the road is smooth

2. The designed lower pipe jacking of the building shall not affect the use function of the building

3. Shorten the pipeline laying period as far as possible and significantly reduce the project cost

4. Single equipment and simple operation method

5. The pipe joints used shall be qualified products produced in accordance with national standards

6. It can be applied to the construction of railway, highway and underground pipeline which is not easy or suitable for trench excavation in chemical industry and other industries

7. Rivers and lakes, downtown areas, scenic spots and historic sites, crops and vegetation protection areas

the above is an introduction to the characteristics and scope of application of pipe jacking construction. I hope it can help you understand more about pipe jacking construction

the trenchless laying unit of Liaoning Xingcheng cable pipe jacking clamped it between the steel sleeve rings of the front and rear pipe joints to uniform the interaction between the pipe joints and reduce the interface damage. After the pipe is jacked, the pipe must be treated as an internal interface. The plywood between the pipe joints shall be chiseled to the same depth (2 ~ 3cm deep), and then troweled with asphalt elastic caulking paste or cement mortar. "In the jacking process of long-distance (more than 100m) pipelines, the grouting process must be adopted, the thixotropic slurry sleeve must be used to reduce the friction between the pipe wall and the soil during the jacking process, and the lost soil shall be filled to reduce the deformation, settlement and water isolation of the soil." Thixotropic mud is composed of bentonite and water, with a mix ratio of 8. The thixotropic slurry is stored in the slurry storage tank after mixing, and then transported to the concrete pipe grouting hole through the pipeline through the grouting machine. The soil is injected to form a slurry sleeve. "Due to the large pipe diameter (D = 2000mm) and large buried depth of the sewage pipeline, the pipe jacking construction shall be adopted according to the design requirements in the construction scheme of the open caisson for pipe jacking and the open caisson for the receiving well." Open caisson construction is adopted for 2 working wells and 2 receiving wells for pipe jacking construction. In order to ensure the quality and timely complete the schedule, the winter construction measures shall not only comply with the general requirements of winter construction, but also consider the different conditions of various parts. Therefore, the winter construction shall be implemented according to the following principles. "Since the construction site is relatively open and the area belongs to frost heaving area, it is indicated that calcium silicate board (or sand paddle and other inorganic materials) is used as the back plate of the sample for the long-term use of the central pile, and the benchmarks are buried 1.0m deep underground and set at 0.6m × 0.6m × 1.0m concrete pier shall be protected from frost expansion. The accuracy shall be checked at any time according to the weather changes. "In order to prevent the foundation and concrete foundation from freezing due to the rise of groundwater level, special personnel shall be assigned to observe that the groundwater can also reduce the production cost at the same time, and timely precipitation. Special personnel shall be assigned to be on duty to ensure normal precipitation." The water injection of closed water test pipeline must be carried out under normal temperature. When the water injection reaches the test water level, check that the wellhead is covered with rock wool. After the closed water test is completed, the water in the water pipeline shall be pumped up to the ground drainage system in time. "(1) the project department establishes a safety assurance team. According to the design drawings, the width of the inner wall of the open caisson is 4.0m, and the wall thickness on both sides is, which is divided into three sections. The width of the whole open caisson is B = 5.0m; the length of the inner wall of the open caisson is 7.0m, and the wall thickness on both sides is 0.0.3 m, which is divided into three sections. The length of the whole open caisson is l = 8.0m; the depth of the open caisson is about 11.2m. The opening of the shaft wall shall be cut off mechanically during pipe jacking construction after the bottom is sunk." C25 concrete shall be used, and undrained sinking shall be used for sinking, and underwater concrete shall be used for bottom sealing. After pouring the bottom plate of the open caisson, both sides of the connecting pipe shall be treated with cement mixing piles. The mixing piles at the portal shall be densified. See the following figure (plan of the working well) for the specific dimensions. "Site leveling", DN25 galvanized water pipe is used to connect to the working well, and the water pipe is buried 20cm underground; The layout of power consumption is as follows: set up the main power box, connect the power supply provided by the construction unit to the main power box, and connect each power box to the working well by the main cable, and then adopt the five wire system with special protective zero line with repeated grounding for the electrical equipment at the construction site (i.e. TN-S system is used for power supply). Through experiments, it is found that

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