Gravity flow pipe-jacking tunnel construction structure based on pipe-jacking shell abandoning process
Through the connection of the pipe shell abandonment process and the riding well, the problems of large demand for the site and difficulty in water supply in the gravity flow pipe tunnel construction are solved, and construction results with little stability and environmental impact are achieved.
Patent Information
- Application Number
- CN202422256208.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-14
AI Technical Summary
When the demand for middle and deep underground space development in cities increases, traditional gravity flow top pipe tunnel construction requires the starting well and receiving well of the top pipe on a larger site, resulting in a great impact on urban facilities and it is difficult to achieve water flow conditions for the pipeline.
The pipe shell abandoning process is adopted to deliver the pipe to the design position, and a horse-shaving connection pipeline is applied on the ground. Combined with the cast-in-place structure in the pipe shell and the concrete seal at the connection of the horse-shaving well, the pipe-shell receiving well is cancelled to achieve water circulation and structural stability of the pipeline.
It provides intensive urban construction plans to reduce project investment and construction cycle, improve soil autonomy, reduce construction risks, and ensure structural stability and low environmental impact.
Smart Images
Figure CN223152044U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tunnel construction, in particular to a gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell abandonment process. Background Technique
[0002] In the construction of urban gravity flow pipe jacking tunnels, the pipe jacking method is a commonly used construction technique. Pipe jacking construction is carried out by setting working wells and receiving well foundations, hoisting pipe jacking machines, pipe sections, jacks, etc. into the working well foundation for initial jacking, and advancing into the receiving well under the action of the main jack and relay jacks, and then hoisting out the pipe jacking machine to achieve the connection from the working well to the receiving well.
[0003] With the continuous deepening of urbanization, the shallow underground space in cities is gradually saturated, and the demand for the development of medium and deep underground spaces is increasing. When implementing gravity flow pipe jacking tunnels in medium and deep underground spaces, it is often necessary to set relatively deep pipe jacking launching wells and receiving wells. When constructing these launching wells and receiving wells, it is often necessary to occupy a large area of construction sites, which has an adverse impact on the normal operation of surrounding urban facilities. In extreme cases, the pipe jacking launching and receiving wells may even be unable to be implemented due to surrounding conditions.
[0004] With the continuous increase in the global average temperature and the frequent occurrence of various meteorological disasters year by year, building a "resilient city" has gradually become an essential course for urban development. Constructing gravity flow drainage tunnels as a means to cope with extreme weather often requires the pipe network system to have good water passing conditions.
[0005] To address the problem that the pipe jacking receiving well cannot be implemented, in the prior art, people will use methods such as pipe jacking shell abandonment to send the pipe jacking to the designed position to achieve underground pipe connection, but it is still difficult to achieve the water passing conditions of the pipeline. Summary of the Invention
[0006] The purpose of the utility model is to provide a gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell abandonment process according to the deficiencies of the above-mentioned prior art. By using the pipe jacking shell abandonment process to send the pipe jacking to the designed position and constructing a riding well on the ground to connect the pipeline to achieve the water passing conditions, the pipe jacking receiving well for the gravity flow pipeline in the traditional pipe jacking method is eliminated, reducing the project cost and construction period. At the same time, methods such as cast-in-place structure inside the pipe jacking shell and pouring concrete at the connection between the pipe jacking pipeline and the riding well for sealing are adopted to ensure the overall stability of the structure, reduce the impact on the surrounding environment, and reduce the construction risk.
[0007] The purpose of the utility model is achieved by the following technical solutions:
[0008] A construction structure for a gravity flow jacking pipe tunnel based on the jacking pipe shell abandonment process, characterized in that it includes an abandoned jacking machine shell, a jacking pipe section, and a riding well structure. The jacking machine shell and the jacking pipe section are fixedly connected and their interiors are in communication. The riding well structure is arranged above the jacking pipe section and their interiors are in communication.
[0009] The jacking machine shell and the jacking pipe section are connected and fixed through an in-shell cast-in-place structure to form an integral structure.
[0010] The in-shell cast-in-place structure includes circumferential reinforcement bars, longitudinal reinforcement bars, and L-shaped connecting bars. The circumferential reinforcement bars are arranged along the circumferential direction of the jacking machine shell, the longitudinal reinforcement bars are arranged along the longitudinal direction of the jacking machine shell, and the L-shaped connecting bars are used to connect the circumferential reinforcement bars and the longitudinal reinforcement bars. After formwork support and pouring, each reinforcement bar forms the in-shell cast-in-place structure.
[0011] The in-shell cast-in-place structure is connected to the jacking pipe section by implanting reinforcement bars.
[0012] The riding well structure includes a precast riding well shaft, a riding well enclosure, and a steel sleeve. The steel sleeve is arranged inside the riding well enclosure, and the precast riding well shaft is arranged inside the steel sleeve and is in communication with the jacking pipe section.
[0013] Concrete is poured and sealed at the connection between the precast riding well shaft and the jacking pipe section.
[0014] Both the jacking machine shell and the jacking pipe section are partially arranged in the foundation reinforcement body, and the connection between them is within the range of the foundation reinforcement body.
[0015] A waterproof part is arranged at the connection port between the jacking machine shell and the jacking pipe section.
[0016] Bricks and foamed concrete are used to build a wall at the pipeline position between the jacking machine shell and the jacking pipe section.
[0017] The advantages of the present utility model are:
[0018] (1) It provides a feasible solution for the construction of gravity flow jacking pipe tunnels in densely populated urban areas where jacking pipe receiving wells are not feasible. The jacking pipe receiving well is cancelled. After the jacking pipe reaches the receiving location, the overall structure of the jacking machine shell is abandoned. The jacking pipe is connected to the riding well to achieve water passing conditions, directly reducing project investment and construction period, and saving a large amount of resources for society;
[0019] (2)In the receiving section of the pipe jacking, the surrounding soil mass is ground improved, which enhances the self - standing ability of the soil mass and meanwhile plays a certain role in water isolation. At the same time, a cast - in - place structure is constructed inside the pipe jacking machine shell. L - shaped steel bars are used to connect the reinforcement of the cast - in - place structure with the pipe jacking machine shell. Meanwhile, the formwork is reinforced with circumferential + longitudinal steel bars, ensuring the overall stability, reducing the impact on the surrounding environment, and lowering the construction risk. Description of the Drawings
[0020] Figure 1 It is the longitudinal sectional view of the first step of the construction of the present utility model;
[0021] Figure 2 It is the longitudinal sectional view of the second step of the construction of the present utility model;
[0022] Figure 3 It is the longitudinal sectional view of the third step of the construction of the present utility model;
[0023] Figure 4 It is the longitudinal sectional view of the fourth and fifth steps of the construction of the present utility model;
[0024] Figure 5 It is the longitudinal sectional view of the sixth step of the construction of the present utility model;
[0025] Figure 6 It is the construction sectional view of the cast - in - place structure inside the shell in the third step of the construction of the present utility model. Detailed Implementation Manner
[0026] The features of the present utility model and other related features are further described in detail through embodiments with reference to the drawings for the understanding of those skilled in the same industry:
[0027] As Figure 1-6 shown, the marks 1 - 15 in the figure respectively represent: ground improvement body 1, pipe jacking machine cutter head 2, pipe jacking machine shell 3, equipment inside the pipe jacking machine 4, connection port 5, pipe jacking pipe segment 6, cast - in - place structure inside the shell 7, enclosure of the horse - riding well 8, steel sleeve of the horse - riding well 9, precast shaft of the horse - riding well 10, concrete seal 11, L - shaped steel bar 12, formwork of the cast - in - place structure 13, circumferential reinforcement bar 14, longitudinal reinforcement bar 15.
[0028] Embodiment: With reference to Figures 1 to 6 shown, in this embodiment, the construction structure of the gravity - flow pipe jacking tunnel based on the pipe jacking shell - discarding process includes the following construction methods:
[0029] Step 1: As Figure 1 shown, according to the design documents, geological exploration results and the investigation of the surrounding environment of the horse - riding well, determine the appropriate ground improvement method, construction parameters, depth of the horse - riding well, enclosure of the horse - riding well, etc., and adopt an appropriate construction method, such as the MJS method, to construct the ground improvement body 1 in the area where the shell - discarding section is located.
[0030] Step 2: As shown in Figure 2 , the jacking pipe segment 6 is jacked from the launching shaft to the designed receiving position, and then the equipment inside the jacking machine 4 located inside the casing 3 of the jacking machine is removed; the advancing direction of the casing 3 of the jacking machine has a cutter head 2 of the jacking machine. Stiffening plates are welded on the top of the casing 3 of the jacking machine, and the chain hoist is fixed on the lifting holes of the stiffening plates. The equipment 4 of the jacking machine is removed one by one with the chain hoist, and then other steel structures inside the jacking machine such as breast plates are cut off and transported to the launching shaft by flatbed truck and lifted out.
[0031] Step 3: As shown in Figure 3 , construction of the in-casing cast-in-place structure: First, position the circumferential reinforcement bars 14 of the cast-in-place structure inside the casing 3 of the jacking machine, and then bind the longitudinal reinforcement bars 15 and weld the L-shaped connecting bars 12. Then install the formwork 13 of the cast-in-place structure, and at the same time install the circumferential reinforcement bars 14 and the longitudinal reinforcement bars 15. The concrete is poured from bottom to top, and the in-casing cast-in-place structure is connected to the jacking pipe segment 6 by planting bars.
[0032] Step 4: As shown in Figure 4 , construction of the pony well structure: Use a total station to recheck the center of the pony well, lower the steel sleeve 9 of the pony well by using a pipe ramming machine, and then construct the high-pressure jet grouting piles of the retaining structure 8 of the pony well. After the retaining construction is completed, soil is taken inside the steel sleeve 9 of the pony well.
[0033] Step 5: Weld the steel bars of the steel sleeve 9 of the pony well and the jacking pipe segment 6, then lower the precast shaft 10 of the pony well, weld the steel bars of the precast shaft 10 of the pony well and the jacking pipe segment 6, and pour concrete for sealing 11 around the connection between the precast shaft 10 of the pony well and the jacking pipe segment. After the construction of the pony well structure is completed, an opening is made at the top of the jacking pipe segment 6.
[0034] Step 6: As shown in Figure 5 , use bricks + foamed concrete to build a wall to seal the pipeline between the jacking pipe segment 6 and the casing 3 of the jacking machine.
[0035] In the specific implementation of this embodiment: In step 1 of this embodiment, the range of MJS foundation reinforcement is 1 m outside the tunnel pipe wall, and the reinforcement range below the tunnel is 4 m outside the pipe, to ensure the bearing capacity of the underlying soil.
[0036] Before the jacking pipe reaches the reinforcement area, recheck the data such as the jacking pipe measurement control points, the jacking pipe axis, the jacking mileage, and the jacking pipe attitude. At the same time, control the jacking speed when entering the foundation reinforcement area to prevent the abnormal increase of soil pressure caused by too fast jacking speed, so as to avoid the overall displacement of the MJS method piles and damage the reinforcement effect.
[0037] When the pipe jacking machine enters the reinforced area, the soil improvement can be carried out on the reinforced soil mass in front of the cutter head 2 of the pipe jacking machine to ensure the normal circulation and outflow of the reinforced soil mass, so as to control the earth pressure within the normal range. Before the final shutdown, the change of the earth pressure should be closely monitored.
[0038] In step four of this embodiment, the connection port 5 between the pipe jacking machine shell 3 and the pipe jacking pipe section 6 can be waterproofed by using water-swelling rubber waterstop strips, ethylene propylene diene monomer (EPDM) rubber elastic gaskets, etc.
[0039] The tools used in the above steps are as follows:
[0040] a. Pipe jacking construction device: It includes a pipe jacking machine and its supporting equipment, precast pipe sections, and the main jacking cylinders, jacks, supporting hydraulic equipment, and relay chambers of the jacking device.
[0041] b. Structural construction device: It includes a welding machine, a cutting machine, a grouting machine, and an electric drill, which are mainly used for welding steel bars, cutting steel bars, pouring concrete, and chiseling out structural steel bars, etc.
[0042] c. Horsehead well construction device: It includes using a pipe ramming machine to lower a steel sleeve, an excavator to excavate soil, and a crane to lower a precast wellbore, etc.
[0043] d. Construction survey device: It includes total stations, levels, tilt sensors, etc., which are instruments for measuring the attitude of the jacked tunnel structure and rechecking the position of the horsehead well.
[0044] In this embodiment, the pipe jacking is sent to the designed position through the pipe jacking shell removal process, and the water passing condition is realized by constructing a horsehead well on the ground to connect the pipelines, eliminating the pipe jacking receiving well for gravity flow pipelines in the traditional pipe jacking method, reducing the project cost and construction period. At the same time, methods such as casting in-situ structures inside the pipe jacking shell and pouring concrete at the connection between the pipe jacking pipeline and the horsehead well for sealing are adopted to ensure the overall stability of the structure, reduce the impact on the surrounding environment, and reduce the construction risk.
[0045] Before the pipe jacking machine reaches the designed shell removal position, the foundation should be reinforced according to the geological conditions and surrounding environment of the shell removal section. The foundation reinforcement can also adopt methods such as cement-based reinforcement, freezing reinforcement, and dewatering reinforcement.
[0046] The final shutdown and shell removal position of the pipe jacking machine is in the foundation reinforcement area, and the pipe jacking machine shell 3 remains in place. The subsequent equipment removal and in-situ structure construction are all carried out inside the pipe jacking machine shell.
[0047] The pipe jacking construction methods include earth pressure balance, slurry balance, composite type, manual excavation type and other pipe jacking construction methods.
[0048] The cross-section of the pipe jacking pipe section 6 can be circular, rectangular and other types according to the design requirements.
[0049] The in-shell cast-in-place structure inside the shell 3 of the pipe jacking machine serves as a permanent lining, adopting a reinforced concrete structure, and can be connected to the last pipe joint of the pipe jacking machine by means of planting steel bars or the like.
[0050] Although the above embodiments have described in detail the concept and embodiments of the object of the present invention with reference to the drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims, so they will not be elaborated one by one here.
Claims
1. A construction structure for a gravity flow pipe jacking tunnel based on the pipe jacking shell abandonment process, characterized in that: It includes a discarded pipe jacking machine housing, pipe jacking pipe segments and a horsehead well structure. The pipe jacking machine housing and the pipe jacking pipe segments are fixedly connected and their interiors are in communication. The horsehead well structure is arranged above the pipe jacking pipe segments and their interiors are in communication.
2. The gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 1, characterized in that: The pipe jacking machine housing and the pipe jacking pipe segments are connected and fixed by an in-shell cast-in-place structure to form an integral structure.
3. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 2, characterized in that: The in-shell cast-in-place structure includes circumferential reinforcement bars, longitudinal reinforcement bars, and L-shaped connecting bars. The circumferential reinforcement bars are arranged along the circumferential direction of the pipe jacking machine housing, the longitudinal reinforcement bars are arranged along the longitudinal direction of the pipe jacking machine housing, and the L-shaped connecting bars are used to connect the circumferential reinforcement bars and the longitudinal reinforcement bars. After formwork support and pouring, each reinforcement bar forms the in-shell cast-in-place structure.
4. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 2 or 3, characterized in that: The in-shell cast-in-place structure is connected to the pipe jacking pipe segments by post-inserted reinforcement.
5. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 1, characterized in that: The horsehead well structure includes a precast horsehead well shaft, a horsehead well enclosure, and a steel sleeve. The steel sleeve is arranged inside the horsehead well enclosure, and the precast horsehead well shaft is arranged inside the steel sleeve and is in communication with the pipe jacking pipe segments.
6. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 5, characterized in that: Concrete is poured and sealed at the connection between the precast horsehead well shaft and the pipe jacking pipe segments.
7. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 1, characterized in that: Parts of the pipe jacking machine housing and the pipe jacking pipe segments are both arranged in the foundation consolidation body, and the connection between them is within the range of the foundation consolidation body.
8. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 1, characterized in that: A waterproof member is provided at the connection port between the pipe jacking machine housing and the pipe jacking pipe segments.
9. A gravity flow pipe jacking tunnel construction structure based on the pipe jacking shell removal process according to claim 1, characterized in that: Walls are built at the pipe position between the pipe jacking machine housing and the pipe jacking pipe segments.