Tunneling construction method of collapsible loess deep-buried pipe-jacking construction well
By setting up pile foundation and support wall and the bearing in one-piece casting on the bottom of the working well, combined with the sealing connection between the cutting head and the pipe, the problem of the sinking and sealing grouting of the pipe in the trapped loess is solved, and the complexity of the pipe hoisting machine is improved Construction stability and efficiency.
Patent Information
- Application Number
- CN202411483233.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2024-12-31
AI Technical Summary
When the pipe hoisting is carried out in wet loess, the foundation of the pipe hoisting machine is prone to sink and deformation, resulting in changes in installation height and unstable construction. The instability of the wet loess affects construction efficiency and accuracy, and sealing and grouting equipment The complex process restricts the construction progress.
The pile foundation and support wall and support table are used to form integrated casting on the bottom surface of the working well to improve load-bearing capacity and stability, and sealing connection between the cutting head and the pipe to avoid water leakage and the complexity of sealing and grouting.
It improves the stability and construction accuracy of the pipe header, reduces the deformation of the well wall, simplifies sealing connections, and improves construction efficiency and overall stability.
Smart Images
Figure CN119221949A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pipe jacking construction, and in particular to a method for excavating a deep-buried pipe jacking construction well in collapsible loess. Background Art
[0002] Pipe jacking construction is an underground pipeline construction method developed after shield construction. It does not require excavation of the surface layer and can pass through roads, railways, rivers, ground buildings, underground structures and various underground pipelines. Pipe jacking construction uses the thrust of the main jacking cylinder and the pipeline relay room to push the tool pipe or tunnel boring machine from the working well through the soil layer to the receiving well for hoisting. At the same time, the pipeline following the tool pipe or tunnel boring machine is buried between the two wells, in order to realize the construction method of trenchless laying of underground pipelines, solve the problems of damage to urban buildings and road traffic congestion during pipeline burial construction, and highlight its advantages in stabilizing the soil layer and protecting the environment. This is very important for cities with busy traffic, dense population, numerous ground buildings and complex underground pipelines. It will create a clean, comfortable and beautiful environment for the city.
[0003] The existing technology has the following problems:
[0004] In the process of pipe jacking construction, it is first necessary to build a working well and a receiving well, and complete the pipe jacking excavation work between the two wells. The pipe jacking machine is installed in the working well and is located at the bottom of the working well. When the soil at the construction site is collapsible loess, due to the low bearing capacity and serious deformation of collapsible loess, after the installation of heavy equipment such as the pipe jacking machine, the foundation used to support the pipe jacking machine is very likely to sink and deform, resulting in changes in the vertical installation height of the pipe jacking machine, affecting the accuracy of the pipe jacking and the construction progress. At the same time, due to the instability of collapsible loess, its lateral pressure is not stable enough. When the pipe jacking machine is working, the reaction force generated is large. When it acts on the surface of the supporting wall, the supporting wall transfers the force to the well wall, which is easy to cause deformation of the well wall, resulting in axial movement of the pipe jacking machine, and also affecting the stability of the work and construction efficiency. At the same time, in order to avoid leakage between pipes, grouting and sealing are carried out simultaneously during the process of pipe jacking. The required equipment and process are cumbersome and complicated, which also restricts the construction efficiency. Further improvements can be made.
[0005] To this end, we proposed a method for excavating deep buried jacking pipe construction wells in collapsible loess to solve the above-mentioned drawbacks. Summary of the invention
[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a construction method for excavating a deep-buried jacking pipe construction well in collapsible loess.
[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a construction method for excavating a deep-buried jacking pipe construction well in collapsible loess, comprising a positioning and laying-out process, a working well construction process, a receiving well construction process, an equipment installation process and a jacking pipe excavation construction process, the positioning and laying-out process comprising a working well positioning step, a receiving well positioning step and a route positioning step, and the working well contour laying-out work is carried out after the working well positioning step, and the receiving well contour laying-out work is carried out after the receiving well positioning step, the working well construction process can be carried out only after the working well contour laying-out work is completed, and the receiving well construction process can be carried out only after the receiving well contour laying-out work is completed.
[0008] Preferably, the working pit construction process includes the following specific steps:
[0009] S1. Excavation and support of working well: Use an excavator to excavate the working well, use steel cylinders for support as the excavation proceeds, and fully weld the steel cylinders.
[0010] S2. Working pit cleaning: After excavation to the pit bottom elevation, the pit bottom is cleaned manually.
[0011] S3. Construction of pile foundation at the bottom of the working pit: specifically including pile hole positioning, pile hole excavation, pile hole support, pile reinforcement cage binding, pile hole concrete pouring, cap tying and binding, and cap concrete pouring. Among them, after the pile hole is positioned and laid out, a pile drilling machine is used to drill holes, and support is provided as the drilling progresses. Subsequently, the pile reinforcement cage is tied and lowered. After the concrete is poured and the concrete solidifies, the upper reinforcement of the pile reinforcement cage is bent and anchored into the cap reinforcement grid. Subsequently, the supporting and compression wall reinforcement is tied, and the bottom of the supporting and compression wall reinforcement is inserted into the cap reinforcement grid. Subsequently, the supporting and compression wall is formwork constructed, and then the supporting and compression wall concrete is poured while the cap concrete is poured.
[0012] Preferably, the receiving well construction process includes the following specific steps:
[0013] S1. Excavation and support of receiving well: Use an excavator to excavate the receiving well, use steel cylinders for support as the well is dug, and fully weld the steel cylinders.
[0014] S2. Receiving well cleaning: After excavation to the well bottom elevation, the well bottom is cleaned manually.
[0015] S3. Construction of the receiving well pit bottom foundation: pour the concrete cushion layer, then tie the pedestal steel bars, and then pour the pedestal concrete.
[0016] Preferably, the equipment installation process includes the following specific steps:
[0017] S1. Installation of drainage equipment and laying of steel plates beside the well: The drainage equipment includes a water pump and a suction pipe. The suction end of the suction pipe extends to the inside of the receiving well and the working well. Steel plates with a thickness of not less than 1 cm are laid around the receiving well and the working well.
[0018] S2. Road surface hardening: The site is hardened by laying concrete for hardened road surface.
[0019] S3. Installation of lifting equipment: Lifting equipment includes crane and crane.
[0020] S4. Installation of pipe jacking machine: The pipe jacking machine is lowered into the working pit by hoisting equipment and assembled.
[0021] S5. Debugging of pipe jacking machine: Confirm the pipe jacking direction, pipe jacking height and pipe jacking angle through measurement.
[0022] S6. Support hole: Confirm the hole and position through measurement and positioning, and cut a hole with a diameter not less than the top pipe on the surface of the support steel cylinder.
[0023] Preferably, the pipe jacking construction process includes the following specific steps:
[0024] S1. Insert the cutter head: First, use the pipe jacking machine to insert the cutter head.
[0025] S2. Knife-tube connection and pipe-pipe connection: After the cutter head is pushed in, the pipe is connected inside the working well. One end of the pipe is aligned with the tail of the cutter head. Waterproof membrane is laid on one end of the pipe and the inner wall of the tail of the cutter head. One end of the pipe and the outer wall of the tail of the cutter head are fully welded. Then, the pipe jacking machine pushes the pipe in, hoists the new pipe and lowers it into the working well. One end of the new pipe is sealed and connected to the tail end of the pipe that has entered the soil. The pipe-pipe connection method is the same as the knife-tube connection method.
[0026] S3. Pipe jacking and excavation construction: The pipe jacking machine is used to jack the pipe. After jacking the pipe for a certain distance, people or equipment enter the pipe to excavate and transport the waste soil out.
[0027] Preferably, the working well depth verification work is carried out after the working well outline layout work is completed, and the working well depth verification work is carried out after the working well excavation step.
[0028] Preferably, the receiving well depth verification work is carried out after the receiving well outline layout work is completed, and the receiving well depth verification work is carried out after the receiving well excavation step.
[0029] Preferably, the pipe jacking position verification work is carried out after the route laying work is completed, and the pipe jacking position verification work is carried out before the pipe jacking machine installation step.
[0030] Preferably, in the pile hole excavation step, the pile hole depth reaches the bearing layer.
[0031] Preferably, in the step of casting the supporting and compression wall, the supporting and compression wall concrete abuts against the supporting steel cylinder of the working shaft.
[0032] Compared with the prior art, the beneficial effects of the present invention are:
[0033] (1) The present invention adopts a method of setting a pile foundation at the bottom of the working pit, thereby improving the bearing capacity of the bottom of the working pit, avoiding the problem of sinking and misalignment of the pipe jacking machine caused by insufficient bearing capacity of collapsible loess, improving the stability of pipe jacking and excavation, and further improving the stability and accuracy of construction, thereby improving construction efficiency.
[0034] (2) The present invention adopts an integrated casting method of the supporting pressure wall and the pedestal on the bottom surface of the working well. Through the rigid connection between the pedestal and the supporting pressure wall, the extrusion effect of the reaction force generated by the pipe jacking machine during operation on the inner wall of the working well is dispersed, thereby avoiding the problem of compressive deformation of the inner wall of the working well caused by insufficient side pressure of collapsible loess, and further avoiding the problem of axial displacement of the pipe jacking machine, further improving the stability and accuracy of the pipe jacking, and further improving the construction efficiency.
[0035] (3) The present invention adopts a sealed connection between the cutter head and the pipe, and a sealed connection between the pipes. When the cutter head is connected to the pipe, the waterproof membrane is bonded to the tail of the cutter head and the inner wall of the pipe end, and the tail of the cutter head and the outer wall of the pipe end are fully welded to avoid water leakage. Similarly, the connection between the pipes is the same as the connection between the pipe and the cutter head, which avoids the trouble of subsequent sealing grouting, improves the integrity and stability of the connection, reduces equipment investment, and further improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below.
[0037] Figure 1 It is a flow chart of the positioning and setting-out process of a method for excavating a deep-buried jacking pipe construction well in collapsible loess proposed by the present invention;
[0038] Figure 2 A flow chart of the working well construction process of a method for excavating a deep buried pipe jacking well in collapsible loess proposed by the present invention;
[0039] Figure 3 It is a flow chart of the receiving well construction process of the excavation construction method of the collapsible loess deep buried jacking pipe construction well proposed by the present invention;
[0040] Figure 4 It is a flow chart of the equipment installation process of a method for excavating a deep buried pipe jacking well in collapsible loess proposed by the present invention;
[0041] Figure 5 The present invention provides a flow chart of the pipe jacking construction process of a method for excavating a deep-buried pipe jacking construction well in collapsible loess. DETAILED DESCRIPTION
[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.
[0043] Please refer to Figure 1-5 , a construction method for excavating a deep-buried jacking well in collapsible loess, comprising a positioning and laying-out process, a working well construction process, a receiving well construction process, an equipment installation process and a jacking construction process, the positioning and laying-out process comprising a working well positioning step, a receiving well positioning step and a route positioning step, and after the working well positioning step, the working well contour laying-out work is performed, and after the receiving well positioning step, the receiving well contour laying-out work is performed, the working well construction process can be performed only after the working well contour laying-out work is completed, and the receiving well contour laying-out work can be performed only after the receiving well contour laying-out work is completed, wherein the receiving well construction process and the working well construction process are performed simultaneously, the working well positioning step, the receiving well positioning step and the route positioning step are performed simultaneously, the working well contour laying-out work, the receiving well contour laying-out work and the route laying-out work are performed simultaneously, wherein the working well construction process comprises the following specific steps:
[0044] S1. Excavation and support of working well: Use excavators to excavate the working well, and use steel cylinders for support as the excavation proceeds. The steel cylinders are fully welded to play a supporting role and prevent the working well from collapsing.
[0045] S2. Working well cleaning: After excavation to the well bottom elevation, the well bottom is cleaned manually to facilitate the positioning and laying out of the pile holes.
[0046] S3. Construction of pile foundation at the bottom of the working pit: specifically including pile hole positioning, pile hole excavation, pile hole support, pile reinforcement cage binding, pile hole concrete pouring, cap tying and binding, and cap concrete pouring. Among them, after the pile hole is positioned and laid out, a pile drilling machine is used to drill holes, and support is provided as the drilling progresses. Subsequently, the pile reinforcement cage is tied and lowered. After the concrete is poured and the concrete solidifies, the upper reinforcement of the pile reinforcement cage is bent and anchored into the cap reinforcement grid. Subsequently, the supporting and compression wall reinforcement is tied, and the bottom of the supporting and compression wall reinforcement is inserted into the cap reinforcement grid. Subsequently, the supporting and compression wall is formwork constructed, and then the supporting and compression wall concrete is poured while the cap concrete is poured.
[0047] In this implementation scheme: a method of setting up pile foundations at the bottom of the working well is adopted to improve the bearing capacity of the bottom of the working well, avoid the problem of sinking and dislocation of the pipe jacking machine due to insufficient bearing capacity of the collapsible loess, improve the stability of pipe jacking and excavation, and then improve the stability and accuracy of construction, and improve construction efficiency. At the same time, an integrated casting method of the supporting pressure wall and the pedestal on the bottom of the working well is adopted. Through the rigid connection between the pedestal and the supporting pressure wall, the extrusion effect of the reaction force generated by the pipe jacking machine during operation on the inner wall of the working well is dispersed, avoiding the problem of compressive deformation of the inner wall of the working well caused by insufficient side pressure of the collapsible loess, and further avoiding the problem of axial displacement of the pipe jacking machine, further improving the stability and accuracy of the pipe jacking, and further improving the construction efficiency.
[0048] Specifically, the receiving well construction process includes the following specific steps:
[0049] S1. Excavation and support of receiving well: Use an excavator to excavate the receiving well, use steel cylinders for support as the well is dug, and fully weld the steel cylinders.
[0050] S2. Receiving well cleaning: After excavation to the well bottom elevation, the well bottom is cleaned manually.
[0051] S3. Construction of the receiving well pit bottom foundation: pour the concrete cushion layer, then tie the pedestal steel bars, and then pour the pedestal concrete. Since no equipment is installed in the receiving well, the traditional pedestal can meet the construction needs.
[0052] In this implementation scheme: the receiving well switch and receiving well support steps are the same as the working well excavation and working well support methods, and will not be elaborated on in detail.
[0053] Specifically, the equipment installation process includes the following specific steps:
[0054] S1. Installation of drainage equipment and laying of steel plates beside the well: The drainage equipment includes a water pump and a suction pipe. The suction end of the suction pipe extends to the inside of the receiving well and the working well to facilitate pumping water at any time and avoid water accumulation in the well. Steel plates with a thickness of not less than 1 cm are laid around the receiving well and the working well to improve the bearing capacity, facilitate the transportation of equipment and workers into the collapsible loess, and improve the convenience of construction.
[0055] S2. Road hardening: The site is hardened by paving concrete to make it easier for vehicles to drive and people to walk.
[0056] S3. Installation of lifting equipment: The lifting equipment includes cranes and cranes, which are common lifting equipment in this field and are used for lifting pipes and transporting waste soil.
[0057] S4. Installation of pipe jacking machine: The pipe jacking machine is lowered into the working pit by hoisting equipment and assembled. This is a common assembly method and will not be elaborated on here.
[0058] S5. Debugging of pipe jacking machine: Confirm the pipe jacking direction, height and angle through measurement, and install the laser navigation system to avoid position deviation.
[0059] S6. Support hole: Confirm the hole and position through measurement and positioning, and cut a hole with a diameter not less than the top pipe on the surface of the support steel cylinder.
[0060] In this implementation scheme: corresponding holes are opened on the surfaces of the working well support steel cylinder and the receiving well support steel cylinder to facilitate the passage of the jacking pipe.
[0061] Specifically, the pipe jacking construction process includes the following specific steps:
[0062] S1. Insert the cutter head: First, use the pipe jacking machine to insert the cutter head.
[0063] S2. Knife-tube connection and pipe-pipe connection: After the cutter head is pushed in, the pipe is connected inside the working well. One end of the pipe is aligned with the tail of the cutter head. Waterproof membrane is laid on one end of the pipe and the inner wall of the tail of the cutter head. One end of the pipe and the outer wall of the tail of the cutter head are fully welded. Then, the pipe jacking machine pushes the pipe in, hoists the new pipe and lowers it into the working well. One end of the new pipe is sealed and connected to the tail end of the pipe that has entered the soil. The pipe-pipe connection method is the same as the knife-tube connection method.
[0064] S3. Pipe jacking and excavation construction: The pipe jacking machine is used to jack the pipe. After jacking the pipe for a certain distance, people or equipment enter the pipe to excavate and transport the waste soil out.
[0065] In this embodiment: a sealed connection between the cutter head and the pipe and a sealed connection between the pipes are adopted. When the cutter head is connected to the pipe, the waterproof membrane is bonded to the tail of the cutter head and the inner wall of the pipe end, and the tail of the cutter head and the outer wall of the pipe end are fully welded to avoid water leakage. Similarly, the connection between pipes is the same as the connection between pipes and cutter heads, which avoids the trouble of sealing and grouting in the later stage, improves the integrity and stability of the connection, reduces equipment investment, and further improves construction efficiency.
[0066] Specifically, the working well depth verification work is carried out after the working well outline layout work is completed, and the working well depth verification work is carried out after the working well excavation step.
[0067] In this implementation scheme: the depth calibration of the working well is a common measurement work in this field. The staff can perform measurement and calibration according to the design drawings, and no further details will be given here.
[0068] Specifically, the receiving well depth verification work is carried out after the receiving well outline layout work is completed, and the receiving well depth verification work is carried out after the receiving well excavation step.
[0069] In this implementation scheme: the receiving well depth verification work is a common measurement work in this field and will not be described in detail here.
[0070] Specifically, the pipe jacking position verification work is carried out after the route layout work is completed, and the pipe jacking position verification work is carried out before the pipe jacking machine installation step.
[0071] In this implementation scheme: it is convenient for the pipe jacking machine to adjust the pipe jacking position and improve the accuracy of pipe jacking.
[0072] Specifically, in the pile hole excavation step, the pile hole depth reaches the bearing layer.
[0073] In this implementation scheme: the pile hole reaches the bearing layer, so that the bearing capacity of the pile foundation is stronger, and the problem of pile foundation sinking at the bottom of the working pit is avoided.
[0074] Specifically, during the step of pouring the supporting and compression wall, the supporting and compression wall concrete abuts against the supporting steel cylinder of the working shaft.
[0075] In this implementation scheme: the working shaft support steel cylinder also supports the pressure support wall and improves stability.
[0076] Working principle: By setting up pile foundations at the bottom of the working well, the bearing capacity of the bottom of the working well is improved, the problem of sinking and dislocation of the pipe jacking machine due to insufficient bearing capacity of collapsible loess is avoided, the stability of pipe jacking and excavation is improved, and then the stability and accuracy of construction are improved, and the construction efficiency is improved. By integrally casting the supporting wall and the pedestal at the bottom of the working well, and by the rigid connection between the pedestal and the supporting wall, the reaction force generated by the pipe jacking machine during operation on the inner wall of the working well is dispersed, and the problem of compression deformation of the inner wall of the working well caused by insufficient side pressure of collapsible loess is avoided. , thereby further avoiding the problem of axial displacement of the pipe jacking machine, further improving the stability and accuracy of the pipe jacking, and further improving the construction efficiency. At the same time, through the sealed connection between the cutter head and the pipe, and the sealed connection between the pipes, when the cutter head is connected to the pipe, the tail of the cutter head and the inner wall of the pipe end are bonded with waterproof membrane, and the tail of the cutter head and the outer wall of the pipe end are fully welded to avoid water leakage. Similarly, the connection between pipes is the same as the connection between pipes and cutter heads, which avoids the trouble of later sealing grouting, improves the integrity and stability of the connection, reduces equipment investment, and further improves construction efficiency.
[0077] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.
Claims
1. A construction method for excavating a deep buried pipe jacking well in collapsible loess, comprising a positioning and setting out process, a working well construction process, a receiving well construction process, an equipment installation process and a pipe jacking construction process, characterized in that: The positioning and laying-out process includes a working well positioning step, a receiving well positioning step and a route positioning step, and the working well contour laying-out work is carried out after the working well positioning step, and the receiving well contour laying-out work is carried out after the receiving well positioning step. The working well construction process can only be carried out after the working well contour laying-out work is completed, and the receiving well construction process can only be carried out after the receiving well contour laying-out work is completed.
2. The excavation construction method for a deep buried pipe jacking well in collapsible loess according to claim 1 is characterized in that: The working well construction process includes the following specific steps: S1. Excavation and support of working well: Use an excavator to excavate the working well, use steel cylinders for support as the excavation proceeds, and fully weld the steel cylinders. S2. Working pit cleaning: After excavation to the pit bottom elevation, the pit bottom is cleaned manually. S3. Construction of pile foundation at the bottom of the working pit: specifically including pile hole positioning, pile hole excavation, pile hole support, pile reinforcement cage binding, pile hole concrete pouring, cap tying and binding, and cap concrete pouring. Among them, after the pile hole is positioned and laid out, a pile drilling machine is used to drill holes, and support is provided as the drilling progresses. Subsequently, the pile reinforcement cage is tied and lowered. After the concrete is poured and the concrete solidifies, the upper reinforcement of the pile reinforcement cage is bent and anchored into the cap reinforcement grid. Subsequently, the supporting and compression wall reinforcement is tied, and the bottom of the supporting and compression wall reinforcement is inserted into the cap reinforcement grid. Subsequently, the supporting and compression wall is formwork constructed, and then the supporting and compression wall concrete is poured while the cap concrete is poured.
3. The excavation construction method for a deep buried pipe jacking construction well in collapsible loess according to claim 1 is characterized in that: The receiving well construction process includes the following specific steps: S1. Excavation and support of receiving well: Use an excavator to excavate the receiving well, use steel cylinders for support as the well is dug, and fully weld the steel cylinders. S2. Receiving well cleaning: After excavation to the well bottom elevation, the well bottom is cleaned manually. S3. Construction of the receiving well pit bottom foundation: pour the concrete cushion layer, then tie the pedestal steel bars, and then pour the pedestal concrete.
4. The excavation construction method for a deep buried pipe jacking well in collapsible loess according to claim 1 is characterized in that: The equipment installation process includes the following specific steps: S1. Installation of drainage equipment and laying of steel plates beside the well: The drainage equipment includes a water pump and a suction pipe. The suction end of the suction pipe extends to the inside of the receiving well and the working well. Steel plates with a thickness of not less than 1 cm are laid around the receiving well and the working well. S2. Road surface hardening: The site is hardened by laying concrete for hardened road surface. S3. Installation of lifting equipment: Lifting equipment includes crane and crane. S4. Installation of pipe jacking machine: The pipe jacking machine is lowered into the working pit by hoisting equipment and assembled. S5. Debugging of pipe jacking machine: Confirm the pipe jacking direction, pipe jacking height and pipe jacking angle through measurement. S6. Support hole: Confirm the hole and position through measurement and positioning, and cut a hole with a diameter not less than the top pipe on the surface of the support steel cylinder.
5. The excavation construction method for a deep buried pipe jacking construction well in collapsible loess according to claim 1 is characterized in that: The pipe jacking construction process comprises the following specific steps: S1. Insert the cutter head: First, use the pipe jacking machine to insert the cutter head. S2. Knife-tube connection and pipe-pipe connection: After the cutter head is pushed in, the pipe is connected inside the working well. One end of the pipe is aligned with the tail of the cutter head. Waterproof membrane is laid on one end of the pipe and the inner wall of the tail of the cutter head. One end of the pipe and the outer wall of the tail of the cutter head are fully welded. Then, the pipe jacking machine pushes the pipe in, hoists the new pipe and lowers it into the working well. One end of the new pipe is sealed and connected to the tail end of the pipe that has entered the soil. The pipe-pipe connection method is the same as the knife-tube connection method. S3. Pipe jacking and excavation construction: The pipe jacking machine is used to jack the pipe. After jacking the pipe for a certain distance, people or equipment enter the pipe to excavate and transport the waste soil out.
6. The excavation construction method for a deep buried pipe jacking well in collapsible loess according to claim 2 is characterized in that: The working well depth verification work is carried out after the working well outline layout work is completed, and the working well depth verification work is carried out after the working well excavation step.
7. The excavation construction method for a deep buried pipe jacking well in collapsible loess according to claim 3 is characterized in that: The receiving well depth verification work is carried out after the receiving well outline layout work is completed, and the receiving well depth verification work is carried out after the receiving well excavation step.
8. The excavation construction method for a deep buried pipe jacking well in collapsible loess according to claim 4 is characterized in that: After the route laying work is completed, the jacking position verification work is carried out, and the jacking position verification work is carried out before the jacking machine installation step.
9. The method for excavating a deep buried pipe jacking well in collapsible loess according to claim 2, characterized in that: In the pile hole excavation step, the pile hole depth reaches the bearing layer.
10. The method for excavating a deep buried pipe jacking well in collapsible loess according to claim 2, characterized in that: In the step of casting the supporting and compression wall, the supporting and compression wall concrete abuts against the supporting steel cylinder of the working well.