Therefore, in order to protect urban roads, we should try to use trenchless technology.
1.2.
2.6 key points of reaming construction after the construction of the guide hole is completed, the construction personnel can carry out the back reaming process of the guide hole by drilling and reaming.
During jacking construction, the following contents shall be strictly paid attention to: during jacking, no one is allowed to stand on the jacking iron; After jacking in place, the construction line shall be restored immediately; After the jacking construction is completed, the construction personnel must comprehensively repair and consolidate the pipeline line and carry out relevant experiments..
1.2 pipe jacking technology 1 advantages of pipe jacking technology pipe jacking technology does not require slotting to lay pipes, is one of the trenchless construction methods.
Therefore, pipe jacking technology has the characteristics of complexity and multilateralism.
At present, it has been applied to many livelihood projects such as sewage pipeline laying, natural gas pipeline, rainwater pipeline and tap water project, eliminating the social and economic impact caused by previous excavation technology.
After completing the survey and setting out, the construction personnel can operate the directional drilling rig according to the depth requirements at the plane position of the pipeline.
This technology has been used earlier and has many advantages, For example: (1) high construction accuracy; (2) low comprehensive cost: only the soil in the underground soil layer needs to be removed, so as to shorten the construction period and reduce the quantities; (3) small damage to the environment: it can keep the functions of the surrounding building facilities from being damaged; (4) It can pass through obstacles, etc.
2.
The specific contents are as follows: first, master the geological conditions of the construction site, such as water content, permeability, etc.
Moreover, the pipe jacking technology has great potential safety hazards, and there are certain dangers in the construction.
First, investigate the underground pipe network at or near the construction site, locate the water supply, gas, communication, power and other pipelines on site, strictly analyze those pipelines that need to be stopped or removed, and then clearly mark them; Second, investigate the traffic conditions such as traffic flow and pedestrian flow on the road surface at the construction site, design traffic guidance signs at the intersection when necessary, arrange special personnel for command, and reasonably arrange the construction route according to the road traffic conditions; Third, clearly grasp the situation of drainage pipelines at and near the construction site, plan and design the best sewage discharge route, and set up temporary sewage discharge pipelines when necessary to avoid construction sewage flowing into other locations; Fourth, if there are bridges or other buildings on the construction site, designers must find out the pier, abutment foundation, building foundation pile, etc., so as to avoid the destructive impact of pipeline construction.
Key points of construction 1 Overview 1.1 urban underground pipeline is developing rapidly under the background of the rapid development of urban modernization and informatization.
If the traditional excavation construction technology is adopted, it will not only have a large economic burden, but also have an adverse impact on society and environment.
2.7 key points of jacking construction: after the construction of the guide hole is completed and the hole wall has a certain strength, the jacking construction process will be entered.
It uses a hard pipe to pass under the soil layer to form facilities for water supply and drainage or other functions.
it is precisely with these advantages that pipe jacking technology has been widely used.
The significance of studying pipe jacking technology at present, people pay more and more attention to environmental protection.
Then, the personnel of the construction unit shall clearly mark the specific position of the pipeline, i.e.
The back expansion process is generally completed in several times, and the squeeze expansion bit is used in the last time to shape and stabilize the hole wall.
Analysis of key points of pipe jacking construction technology in municipal engineering construction 2.1.
At present, its role and function are becoming more and more important.
horizontal height and operation direction, with measuring instruments according to the plane position of the pipeline on the design drawing.
Therefore, strengthening the research on pipe jacking technology is of great significance.
However, China’s pipe jacking technology started later than other countries, and has not formed a complete theoretical system so far.
Since pipe jacking construction technology is a non excavation construction technology, it is generally believed that non excavation construction technology is a construction method without excavation or trenching on the surface.
1.2.2 defects of pipe jacking technology, because pipe jacking technology is often used When applied to underground concealed works, the complexity of concealed works is unpredictable.
2.2 site investigation and investigation: make construction preparations.
Therefore, we should strengthen the research on pipe jacking technology in municipal engineering construction.
2.4 after detailed investigation and technical analysis, the designer can design the construction mode, line and well location based on this.
If it fails, it will bring huge economic losses.
2.3 after systematic and detailed survey and investigation, the designer shall analyze relevant data and information to obtain some construction technical conditions on the construction site, and determine a reasonable construction organization design according to the survey and technical analysis.
Therefore, the application scope of pipe jacking technology is gradually increased.
During the back expansion process, the appropriate mud volume shall always be maintained, and the drilling speed shall be reasonably controlled according to the actual needs for slag removal.
Strengthening the research on pipe jacking technology can improve and perfect the pipe jacking technology, improve the technical and quality standards of pipeline construction, improve the utilization rate of pipeline, reduce economic losses, and make the project more scientific and standardized.
Correct the wrong understanding and clarify the concept of pipe jacking construction.
There is an urgent need to build a large number of new pipelines in the city.
If the soil layer contains sand layer or rock stratum, the designer needs to further find out the specific conditions of sand layer and rock stratum, and then select the pipe jacking construction technology that meets the geological conditions; Secondly, analyze and summarize the variation law of groundwater level, and clearly describe its source, water surface height and tide; Third, master the relevant key points of various pipe jacking construction technologies.
3.
2.5 drilling guide hole trajectory construction whether the design and construction of guide hole trajectory are reasonable directly affects the accuracy of pipeline construction and has a vital impact on the success of pipeline construction.
