Pre-guiding mechanism for pipe jacking engineering

Abstract

The invention discloses a front guiding mechanism for pipe jacking engineering. A plurality of jacks capable of pushing the guiding pipe joint are installed at the front end of the concrete pipe joint; The surrounding surface of the guide pipe joint is provided with multiple grouting ports, and the grouting ports communicate with the grouting machine installed in the concrete pipe joint through pipes. In the present invention, a small-diameter guide pipe joint is added to the front end of the concrete pipe joint, and a jack is used to push the guide pipe joint to assist manual excavation. A soil retaining support structure is set in the guide pipe joint to prevent the soil from flowing into the pipe; During the process of jacking, the lower soil layer is reinforced by grouting to realize the continuous support of the jacking pipeline and play a long-term protection role for the pipeline; It plays an important role in preventing ground subsidence and cracking, and can effectively reduce construction difficulty and greatly improve work efficiency.

Description

technical field [0001] The invention relates to the technical field of municipal engineering construction, in particular to a front guiding mechanism for pipe jacking engineering. Background technique [0002] Pipe jacking technology is a non-excavation pipeline laying construction technology used in municipal construction. The pipe jacking technology uses the thrust between the main jacking cylinder and the relay between the pipelines to push the tool pipe or excavator from the working well through the soil layer. Push it into the receiving well and hoist it; its advantages are that it does not affect the surrounding environment or has a small impact, the construction site is small, and the noise is small. [0003] At present, in the pipe jacking construction, manual excavation is generally used for the front end excavation of the soft soil layer, soft soil and hard soil interlayer without groundwater. The artificial pipe jacking construction mainly has the following proble...

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Problems solved by technology

[0003] At present, in pipe jacking construction, manual excavation is generally used for the excavation of the front end of the pipe jacking in the soft soil layer, soft soil and hard soil interlayer without groundwater. The main problems in the manual pipe jacking construction are as follows: 1. Manually excavate the soil at the front end of the pipe The efficiency of the body is low, and the jacking speed is slow and cannot meet the construction requirements; 2. Manual excavation is prone to over-excavation phenomenon that is larger than the diameter of the pipeline, and it is easy to cause disturbance to the surrounding soil, which may lead to ground subsidence in the later stage; 3 1. There are great potential safety hazards in manual excavation; 4. During the manual pipe jacking process, problems such as pipe joint sinking, drooping, and soft soil flowing into the pipe are prone to occur, resulting in cracking and subsidence of the ground.

[0004] In addition, for pipe jacking construction in weak soil layers, surface grouting is generally used to process the bottom layer in the pipe jacking project. This method has the following defects: 1. The project cost is high, and the requirements for materials and machinery are relatively high; 2. It is difficult to implement in places such as roads, squares, and rivers, and it is more destructive to the soil layer; 3. The construction noise is loud, the environment is easy to pollute, and the underground pipeline is easy to be damaged; 4. When the buried depth is large, the ground surface should be reinforced. The reliability is low, and the local reinforcement effect is poor, which causes the pipe joint to sink, and the pipe jacking is prone to failure

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