Pipe jacking shell abandoning receiving waterproof structure

Abstract

The utility model belongs to the technical field of underground engineering, and particularly relates to a pipe jacking shell abandoning receiving waterproof structure which is used for connecting a pipe jacking machine shell reserved in a tunnel with a station tunnel portal and a prefabricated pipe joint. Comprising a flexible waterproof structure arranged between a pipe jacking machine shell and a prefabricated pipe joint and a water stop waterproof structure arranged between the pipe jacking machine shell and a station tunnel portal. Wherein the flexible waterproof structure comprises a wedge-shaped waterproof combination arranged at the bell and spigot joint of the pipe jacking machine shell and the prefabricated pipe joint and an elastic waterproof combination arranged at the joint of a tail annular rib plate of the pipe jacking machine shell and the section of the prefabricated pipe joint; the water stopping and preventing structure comprises an L-shaped steel plate arranged along the periphery of the station tunnel portal, and the L-shaped steel plate and a pipe jacking machine shell are rapidly welded and filled with slurry in a grouting mode to form a closed water stopping mode. The device is low in construction risk, low in construction cost, small in influence on the surrounding environment and capable of being used for pipe jacking shell abandoning receiving construction under various complex stratums under the condition that the surrounding environment is complex and no receiving well construction space exists.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground engineering, and in particular relates to a jacking pipe abandoned shell receiving waterproof structure. Background Art

[0002] Pipe jacking construction technology is widely used in urban underground passages and underpasses due to its high construction efficiency, small construction disturbance, and small footprint. In pipe jacking construction, the outlet reception of the pipe jacking is a key link, which directly affects the quality, efficiency and safety of the tunnel project.

[0003] Traditional receiving solutions often require the setting up of an open-cut working well at the receiving end for the pipe jacking machine to receive. After the pipe jacking machine arrives at the working well, the first pipe section is connected to the post-cast ring beam at the working well portal, and the pipe jacking machine begins to be dismantled. However, the existing receiving well solution has the disadvantages of high construction cost, long construction period, easy to be restricted by underground environment or terrain, and certain construction risks. In addition, as the above-ground and underground space in cities becomes increasingly crowded, the receiving space that can be guaranteed during pipe jacking construction is also decreasing. In some special cases, it is no longer possible to arrange a pipe jacking receiving well, and the pipe jacking machine can only be received in existing underground buildings.

[0004] Based on the above problems, it is an urgent problem to design a waterproof structure for jacking pipe shell receiving with low construction risk, low engineering cost and little impact on the surrounding environment, which is particularly suitable for tunnel construction using rectangular jacking pipe shell receiving construction technology in water-rich soft soil strata, complex surrounding environment and no receiving well construction space. Utility Model Content

[0005] The utility model proposes a jacking pipe abandoned shell receiving waterproof structure with low construction risk, low engineering cost and little impact on the surrounding environment. Its purpose is to solve the problem of jacking pipe tunnel construction under complex geological or environmental conditions when a receiving well cannot be constructed due to the presence of many existing upper buildings or the cumbersome relocation of pipelines.

[0006] The technical solution is as follows:

[0007] A pipe jacking abandoned shell receiving waterproof structure, which is used to connect the casing of the pipe jacking machine retained in the tunnel with the station tunnel door and the prefabricated pipe section, and comprises a flexible waterproof structure arranged between the casing of the pipe jacking machine and the prefabricated pipe section and a water-stopping waterproof structure arranged between the casing of the pipe jacking machine and the station tunnel door, wherein:

[0008] The flexible waterproof structure includes a wedge-shaped waterproof combination arranged at the socket of the pipe jacking machine casing and the prefabricated pipe segment and an elastic waterproof combination arranged at the connection between the tail annular rib plate of the pipe jacking machine casing and the cross-section of the prefabricated pipe segment;

[0009] The water-stopping and waterproofing structure comprises an L-shaped steel plate arranged along the circumference of the station tunnel gate. The L-shaped steel plate is quickly welded to the casing of the pipe jacking machine and filled with grouting to form a closed water-stopping structure.

[0010] In one technical solution, the wedge-shaped waterproof assembly includes:

[0011] A steel ring is fixedly arranged at the end of the first pipe section along the circumference of the first pipe section of the prefabricated pipe section;

[0012] The wedge-shaped rubber strip has a wedge-shaped cross-section and is interference-set between the casing of the pipe jacking machine and the first pipe section. The inner side surface of the wedge-shaped rubber strip is set along the circumference of the first pipe section, and the outer side surface is interference-fitted with the casing of the pipe jacking machine. The descending end abuts against the steel ring, and the ascending end abuts against the pipe section step of the first pipe section.

[0013] In one technical solution, at least two circles of pipe step with gradually decreasing diameters are provided on the outer wall of the first pipe section near the socket side along its circumference. Taking this embodiment as an example, two circles of pipe step are provided, the first circle of pipe step is close to the socket, the outer diameter of the second circle of pipe step is smaller than the inner diameter of the casing of the pipe jacking machine, the first circle and the second circle of pipe step are inserted into the socket of the casing of the pipe jacking machine, the steel ring and the wedge-shaped rubber strip are provided on the first circle of pipe step, the descending end of the wedge-shaped rubber strip abuts against the steel ring, and the ascending end abuts against the second circle of pipe step.

[0014] In one technical solution, the elastic waterproof combination includes expansion rubber, force transmission pads, elastic rubber sealing pads and two-component polysulfide sealant at the cross-section connection between the annular ribs at the rear of the casing and the first pipe section, and the expansion rubber, force transmission pads and two-component polysulfide sealant are arranged in sequence from the outside to the inside.

[0015] In one technical solution, the force transmission pad is a nitrile cork pad, the number of which is at least two circles, and an elastic rubber sealing pad is arranged between adjacent nitrile cork pads. The expansion rubber is filled between the casing of the pipe jacking machine, the steel ring and the outermost nitrile cork pad, and the two-component polysulfide sealant is filled between the tail annular rib, the first pipe section and the innermost nitrile cork pad.

[0016] In one technical solution, a water-stop steel ring and a water-stop steel plate are fixedly connected between the inner ring of the annular ribs at the rear of the casing and the cross section of the first pipe section.

[0017] In one technical solution, the cross section of the elastic rubber gasket is hourglass-shaped, and has a plurality of compression holes inside. The hourglass-shaped gasket may have two trapezoidal upper bases overlapped, and the two trapezoids are axially symmetrically distributed relative to the upper bases. Such an elastic rubber gasket is easily compressed and deformed under stress, driving air circulation and providing good elastic function.

[0018] In one technical solution, a cast-in-place reinforced concrete structure is constructed at the casing of the pipe jacking machine to form a discarded shell cast-in-place section. The annular ribs on the inner side of the pipe jacking machine casing are used to weld the outer and inner side steel bars of the discarded shell cast-in-place section to the pipe jacking machine casing, and longitudinal through steel bars are installed at the place on the inner side of the pipe jacking machine casing where there is no annular rib obstruction. Bolts are arranged on the pipe jacking machine casing to form the pipe jacking machine casing and the reinforced concrete structure as a whole.

[0019] In one technical solution, the water-stopping and waterproofing structure also includes a pre-buried grouting pipe pre-buried at the stop position of the pipe jacking machine, through which cement slurry is poured into the underground continuous wall, the L-shaped steel plate and the casing of the pipe jacking machine and filled densely.

[0020] Combining all the above technical solutions, the advantages and positive effects of the utility model are as follows:

[0021] 1. In the utility model, a flexible connection is adopted between the abandoned shell cast-in-place section and the prefabricated pipe section, a wedge-shaped rubber strip and a steel ring are arranged at the socket in sequence, and expansion rubber, nitrile cork, elastic rubber sealing pads and two-component polysulfide sealant are arranged at the cross-section connection, which can effectively achieve waterproofing. The wedge-shaped waterproof combination and the elastic waterproof combination together constitute a flexible waterproof structure, which not only has a double waterproof effect, but also has a double anti-seismic, anti-impact and displacement compensation effect.

[0022] 2. In the utility model, in the waterproof design of the abandoned shell cast-in-place section and the station tunnel gate, an L-shaped steel plate is arranged around the tunnel gate. After the pipe jacking machine reaches the specified position, the L-shaped steel plate and the pipe jacking machine casing are quickly welded to form a closed water stop, and then cement slurry is poured through the pre-buried grouting pipe to achieve a good water stop effect.

[0023] 3. The utility model combines the characteristics of the equipment and takes into account the factors that the vertical and horizontal ribs inside the casing of the pipe jacking machine are dense, which makes it difficult and time-consuming to cut them out. Therefore, the utility model makes full use of the annular ribs of the existing casing, welds them to the steel bars in the cast-in-place section, and sets up longitudinal through steel bars in the places on the inner side of the cast-in-place section where there are no annular ribs to block the ribs, so that the casing of the pipe jacking machine and the reinforced concrete structure form a whole, ensuring the overall stability and waterproofness.

[0024] 4. The utility model realizes the reception of the abandoned shell of the pipe jacking machine, has a reasonable structural design, safe and simple construction, low engineering cost, and little impact on the surrounding environment during the construction process. It can be widely used in the construction of urban underground space, and can be used for the reception of the abandoned shell of the pipe jacking machine under various complex strata when the surrounding environment is complex and there is no space for the construction of a receiving well. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, serve to explain the principles of the present disclosure;

[0026] Figure 1 It is a structural schematic diagram of the waterproof design between the abandoned shell cast-in-place section and the existing station and the first pipe section in the embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the flexible waterproof structure between the abandoned shell cast-in-place section and the first pipe section in the embodiment of the utility model;

[0028] Figure 3 yes Figure 2 A partial enlarged view of the

[0029] Figure 4 It is a structural schematic diagram of the water-stopping and waterproofing structure between the abandoned shell cast-in-place section and the existing station in the embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the steel bar distribution structure of the abandoned shell cast-in-place section in the embodiment of the utility model;

[0031] Figure 6 This is a schematic diagram of the first stop position of the embodiment of the utility model;

[0032] Figure 7 This is a schematic diagram of the second stop position of the embodiment of the utility model;

[0033] Figure 8 This is a schematic diagram of the third stop position of the embodiment of the utility model;

[0034] Fig. 9 It is a schematic diagram of the cast-in-place section of the abandoned shell after pouring in the embodiment of the utility model.

[0035] In the figure: 1-reinforced hidden beam; 2-L-shaped steel plate; 3-continuous ground wall; 4-sleeve valve grouting pipe; 5-jacking machine casing; 6-steel ring; 7-wedge-shaped rubber strip; 8-expansion rubber; 9-annular rib; 10-elastic rubber sealing pad; 11-nitrile cork pad; 12-two-component polysulfide sealant; 13-waterstop steel plate; 14-polyurethane sealant; 15-stud; 16-waterstop steel ring; 17-welded steel bars; 18-annular steel bars; 19-longitudinal steel bars; 20-pipe section step. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0037] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example 1

[0038] A pipe jacking abandoned shell receiving waterproof structure, which is used to connect the pipe jacking machine casing 5 retained in the tunnel with the station tunnel door and the prefabricated pipe segment, and includes a flexible waterproof structure arranged between the pipe jacking machine casing 5 and the prefabricated pipe segment and a water-stopping waterproof structure arranged between the pipe jacking machine casing 5 and the station tunnel door, wherein:

[0039] The flexible waterproof structure (such as Figure 1 (shown in the middle B part) includes a wedge-shaped waterproof combination arranged at the socket of the pipe jacking machine casing 5 and the prefabricated pipe segment and an elastic waterproof combination arranged at the connection between the tail annular rib plate 9 of the pipe jacking machine casing 5 and the cross-section of the prefabricated pipe segment;

[0040] The water-stopping and waterproofing structure (such as Figure 1 The L-shaped steel plate 2 is arranged around the station tunnel door, and the L-shaped steel plate 2 is quickly welded to the casing 5 of the pipe jacking machine and filled with grouting to form a closed water stop.

[0041] In this embodiment, the casing of the pipe jacking machine is finally retained in the tunnel, and there is no need to dig a working well for receiving the pipe jacking machine, which reduces the construction cost, construction period and construction risk. One end of the casing of the pipe jacking machine retained in the tunnel is connected to the first pipe section of the prefabricated pipe section through a flexible waterproof structure, and the other end is connected to the station tunnel door through a water-stopping waterproof structure, which can effectively achieve waterproofing and water-stopping, and realize the receiving of the abandoned shell of the pipe jacking machine. The structural design is reasonable, the construction is safe and simple, the project cost is low, and the construction process has little impact on the surrounding environment.

[0042] Furthermore, it can also be considered in this embodiment that the wedge-shaped waterproof combination includes:

[0043] A steel ring 6 is fixedly arranged at the end of the first pipe section along the circumference of the first pipe section of the prefabricated pipe section;

[0044] The wedge-shaped rubber strip 7 has a wedge-shaped cross-section and is interference-set between the pipe jacking machine casing 5 and the first pipe section. The inner side surface of the wedge-shaped rubber strip 7 is set along the circumference of the first pipe section, and the outer side surface is interference-fitted with the pipe jacking machine casing 5. The descending end abuts against the steel ring 6, and the ascending end abuts against the pipe section step of the first pipe section.

[0045] like Figure 2-3As shown, the steel ring 6 plays a supporting role, the wedge-shaped rubber strip 7 is confined between the steel ring 6 and the pipe segment step, and the outer side is interference fit with the pipe jacking machine casing 5. The wedge-shaped structure is conducive to the rapid assembly between the pipe jacking machine casing 5 and the prefabricated pipe segment during the socket-spiking process, and can play a good waterproof effect after the assembly is completed. Under the premise of meeting the waterproof effect, the flexible connection can have certain seismic resistance, impact resistance and displacement compensation performance, further ensuring the sealing and waterproof effect.

[0046] Furthermore, in this embodiment, it can also be considered that at least two circles of pipe section steps 20 with gradually decreasing diameters are provided on the outer side wall of the first pipe section near the socket side along its circumference. Figure 2-3 As shown, the bell end of the first pipe section is provided with two circles of pipe section steps, the first circle of pipe section steps is close to the bell, the outer diameter of the second circle of pipe section steps is smaller than the inner diameter of the casing of the pipe jacking machine, and larger than the outer diameter of the first circle of pipe section steps, the first and second circles of pipe section steps are inserted into the bell of the casing of the pipe jacking machine, the steel ring and the wedge-shaped rubber strip are arranged on the first circle of pipe section steps, the descending end of the wedge-shaped rubber strip is against the steel ring, and the ascending end is against the second circle of pipe section steps.

[0047] Furthermore, in this embodiment, it can be considered that the elastic waterproof combination includes an expansion rubber 8, a force transmission pad, an elastic rubber sealing pad 10 and a two-component polysulfide sealant 12 at the cross-section connection between the annular rib plate 9 at the rear of the casing and the first pipe section, and the expansion rubber 8, the force transmission pad and the two-component polysulfide sealant 12 are arranged in sequence from the outside to the inside. The wedge-shaped waterproof combination and the elastic waterproof combination together constitute a flexible waterproof structure, which has a double waterproof effect and a double anti-seismic, anti-impact and displacement compensation effect.

[0048] Furthermore, in the present embodiment, it can also be considered that the force transmission pad is a nitrile cork pad 11, and the number thereof is at least two circles, and an elastic rubber sealing pad 10 is arranged between adjacent nitrile cork pads 11, and the expansion rubber 8 is filled between the casing of the pipe jacking machine, the steel ring and the outermost circle of nitrile cork pads, and the two-component polysulfide sealant 12 is filled between the tail annular rib, the first pipe section and the innermost circle of nitrile cork pads.

[0049] Furthermore, in this embodiment, it can also be considered that a water-stop steel ring 16 and a water-stop steel plate 13 are fixedly connected between the inner ring of the annular rib 9 at the rear of the casing and the cross section of the first pipe section.

[0050] Furthermore, in this embodiment, the cross section of the elastic rubber sealing pad 10 is an hourglass-like shape, and has a plurality of compression holes inside. The hourglass-like shape can be in the form of two trapezoidal upper bottom edges overlapping, and the two trapezoids are axially symmetrically distributed relative to the upper bottom edges. Such an elastic rubber sealing pad is easily compressed and deformed under stress, driving air circulation and providing good elastic function.

[0051] Furthermore, in the present embodiment, it can also be considered that a cast-in-place reinforced concrete structure is also constructed at the casing 5 of the pipe jacking machine to jointly form a discarded shell cast-in-place section, and the annular ribs 9 on the inner side of the pipe jacking machine casing 5 are used to weld the outer and inner steel bars of the discarded shell cast-in-place section to the pipe jacking machine casing, and longitudinal through steel bars 19 are installed at the place on the inner side of the pipe jacking machine casing 5 where there is no annular rib obstruction, and bolts 15 are provided on the pipe jacking machine casing 5 to form a whole with the pipe jacking machine casing 5 and the reinforced concrete structure.

[0052] Furthermore, in the present embodiment, it can also be considered that the water-stopping and waterproofing structure also includes a pre-buried grouting pipe pre-buried in the stop position of the pipe jacking machine. The pre-buried grouting preferably adopts a sleeve valve grouting pipe 4, and cement slurry is poured through the pre-buried grouting pipe into the underground continuous wall (continuous ground wall 3), the L-shaped steel plate 2 and the pipe jacking machine casing 5 and filled tightly.

[0053] The utility model provides a waterproof structure for receiving pipe shells with low construction risk, low engineering cost and little impact on the surrounding environment. It is particularly suitable for tunnel construction using rectangular pipe shell receiving construction technology in water-rich soft soil layers, complex surrounding environments and no receiving well construction space.

[0054] Figure 1 to Figure 9 It is a typical example of the shell receiving waterproof structure of the utility model. The embodiment is only used to further illustrate the details of the method of the utility model and its effects, and does not constitute a limitation to the utility model. Technical personnel in this industry can make corresponding derivations according to the external environmental conditions of the project, combined with the engineering geology and hydrogeology conditions during the project implementation. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by technical personnel in this industry without making creative work are within the scope of protection of the utility model. Example 2

[0055] A method for receiving a pipe jacking abandoned shell comprises the following steps:

[0056] S1. When the tip of the main cutter disc of the pipe jacking machine reaches the outside of the ground-connected wall, the machine is stopped for the first time, and then water is sealed, and the ground-connected wall is broken manually, and finally the first re-push is carried out.

[0057] Specifically: Figure 6As shown in the figure, the first shutdown position is when the tip of the main cutter disc of the pipe jacking machine reaches the outside of the ground connection wall. After the pipe jacking machine is shut down for the first time, three measures are adopted to ensure that there is no risk of water inrush before breaking the ground connection wall. First, concentrated mud is continuously injected through the reserved holes in the middle and rear of the pipe jacking machine casing to perform radial water stopping and prevent radial water from coming into the prefabricated pipe sections; second, the manhole reserved in the chest plate at the front end of the pipe jacking machine is used to observe the face in real time for water leakage; third, the water exploration holes drilled on the ground connection wall at the opening are used to observe whether there is water in the soil bin. Figure 7 As shown in the figure, after the shutdown and water sealing, the ground connection wall is manually broken, the main reinforcement of the ground connection wall is cut from top to bottom, and the remaining protective layer and loose reinforcement are broken. Thixotropic mud is injected into the channel every day to prevent the prefabricated pipe section from locking with the soil and to avoid excessive jacking force again. Finally, the first re-push is carried out.

[0058] S2. Stop the machine for the second time when the spokes of the main cutter disc are 50mm away from the newly built hidden beam, then seal the water, excavate the land, clean the slag, remove the spokes of the cutter disc, and finally push it again for the second time.

[0059] Specifically: The second stop position is when the main cutterhead spoke is 50mm away from the newly built hidden beam. After the jacking is in place, thick mud is used to radially inject the jacking machine and the prefabricated pipe sections of the jacking pipes in the adjacent reinforcement area to form a water stop ring to prevent water leakage in the jacking area.

[0060] After the machine is shut down, the spiral machine is used to continue excavating. When it cannot be excavated normally, the spiral machine is dismantled, and then the chest plate manhole is opened. The operator enters through the manhole and clears the slag through the spiral machine hole. After the slag is cleared, the operator removes the cutter disc spokes, and the spiral machine and cutter disc spokes are transported out through the channel inside the prefabricated pipe section. After all operations are completed, the second push is carried out.

[0061] S3, when reaching the final position, the machine is stopped for the third time, and then the waterproof structure in Example 1 is processed, grouting and sealing the mold are performed, and then the pipe jacking machine equipment is disassembled.

[0062] Specifically: Figure 8 As shown in the figure, the third stop position is the final stop position. Immediately after the jacking is in place, double liquid slurry is radially injected into the jacking machine and the prefabricated pipe segment to form a water stop ring, and then the remaining debris in the soil bin is cleaned, and the mold is sealed to grout the gap between the shell and the ground wall. After the grouting is completed, cement grouting is carried out through the grouting holes of the jacking machine shell and the prefabricated pipe segment. After the cement grouting is completed, the remaining disassembly work of the jacking machine is carried out.

[0063] S4. Finally, cast-in-place structure construction is carried out and the tunnel is penetrated.

[0064] Specifically: Fig. 9As shown, the cast-in-place structure is finally constructed and the passage is connected. The cast-in-place structure is divided into two parts, the lower base plate and partial side walls are cast with conventional concrete, and the remaining side walls and top plate are cast with self-compacting concrete to ensure the quality of concrete casting.

[0065] Furthermore, in this embodiment, it can also be considered that the soil in the final area of ​​the jacking shell is reinforced with φ2000@1400MJS large-diameter rotary jet piles, and the reinforced body needs to be able to withstand the water and soil pressure after the ground-connected wall is broken.

[0066] Furthermore, in the present embodiment, it can also be considered that the manual demolition of the ground-connected wall in step S1 includes cutting off the main reinforcement of the ground-connected wall from top to bottom and removing the remaining protective layer and loose reinforcement bodies. The demolition range of the ground wall is 30 mm larger than the outer contour of the pipe jacking machine, and an L-shaped steel plate is buried around the ground-connected wall opening.

[0067] Furthermore, in this embodiment, it can also be considered that after the ground-connected wall is broken, thixotropic mud should be injected into the channel every day to prevent the prefabricated pipe section from locking with the soil and to avoid excessive thrust when jacking again.

[0068] Furthermore, in the present embodiment, it can also be considered that in step S2, the sealing water after the second shutdown is to be radially injected into the pipe jacking machine and the prefabricated pipe sections in the adjacent reinforcement area using concentrated mud to form a water stop ring to prevent water leakage in the pipe jacking area.

[0069] Furthermore, in this embodiment, it can be considered that in step S4, the casing of the pipe jacking machine and the cast-in-place structure together form a discarded cast-in-place section, the cast-in-place structure makes full use of the annular ribs of the existing shell, the outer steel bars are welded to the casing in the cast-in-place section, and longitudinal through steel bars are installed in the places where there is no annular rib barrier on the inner side, and bolts are set on the casing of the pipe jacking machine to make the casing and the reinforced concrete structure form a whole. Figure 5 As shown in the figure, the abandoned shell cast-in-place section is retained in the tunnel because the jacking machine shell is retained in the tunnel. Considering that the vertical and horizontal ribs inside the jacking machine shell are dense, it is difficult and time-consuming to cut them out. Therefore, the annular ribs of the existing shell are fully utilized and welded to the outer steel bars of the structure in the cast-in-place section. The remaining ribs are all cut out. In addition, longitudinal through steel bars are set in the places where there are no annular ribs blocking the inner side of the cast-in-place section, and bolts are set on the jacking machine shell to form a whole with the reinforced concrete structure. Then concrete pouring is carried out to complete the construction of the abandoned shell cast-in-place section.

[0070] Furthermore, in this embodiment, it can also be considered that the waterproof structure processing in step S3 includes waterproof design of the abandoned shell cast-in-place section and prefabricated pipe sections, and waterproof design of the abandoned shell cast-in-place section and the station portal.

[0071] The waterproof design of the abandoned shell cast-in-place section and the prefabricated pipe section is as follows: a flexible connection is used between the cast-in-place section and the prefabricated pipe section, wedge-shaped rubber strips and steel rings are sequentially arranged at the sockets of the casing and the prefabricated pipe section, and expansion rubber, nitrile cork (used as a force transmission pad), elastic rubber sealing pad and two-component polysulfide sealant are arranged from top to bottom at the cross-section connection between the casing tail ring plate and the first prefabricated pipe section (first pipe section). After the pipe jacking machine reaches the designated position, the casing tail ring plate is welded to the embedded steel plate of the first prefabricated pipe section through the steel ring.

[0072] like Figure 1-3 As shown in the figure, the cast-in-place section of the abandoned shell is connected to the prefabricated pipe section by a flexible connection. A wedge-shaped rubber strip and a steel ring are sequentially arranged at the socket of the casing and the prefabricated pipe section. At the cross-sectional connection between the ring plate at the rear of the casing and the first pipe section, expansion rubber, elastic rubber sealing pads, and two-component polysulfide sealant are arranged from top to bottom for caulking treatment, which together form a waterproof structure between the cast-in-place section and the prefabricated pipe section. After the pipe jacking machine reaches the designated position, the ring plate at the rear of the casing is welded to the embedded steel plate of the first pipe section through a steel ring.

[0073] The waterproof design of the abandoned shell cast-in-place section and the station tunnel gate is as follows: an L-shaped steel plate is set around the tunnel gate. After the pipe jacking machine reaches the designated position, the L-shaped steel plate is quickly welded to the pipe jacking machine shell to form a closed water stop, and then cement slurry is poured through the pre-buried grouting pipe.

[0074] like Figure 4 As shown in the figure, the waterproof structure of the abandoned shell cast-in-place section and the station tunnel gate is mainly composed of steel plates and pre-buried grouting pipes. An L-shaped steel plate is set around the tunnel gate. After the pipe jacking machine reaches the designated position, the L-shaped steel plate is quickly welded to the pipe jacking machine shell to form a closed water stop. Then cement slurry is poured through the pre-buried grouting pipe to achieve a rapid water stop effect, ensuring the normal construction requirements of the abandoned shell cast-in-place section and the station tunnel gate.

[0075] Furthermore, it can also be considered in the present embodiment that the purpose of the repeated pushing in steps S1 and S2 is to overlap the casing of the pipe jacking machine within the range of the ground connection wall to a greater extent.

[0076] Furthermore, in this embodiment, it can also be considered that the stop positions and times in steps S1, S2, and S3 are to optimize the construction process in combination with the existing structure of the station, so as to achieve the reception of the abandoned shell of the jacking pipe and the penetration of the tunnel.

[0077] This embodiment discloses a design scheme for receiving abandoned shells from jacking pipes, including the use of large-diameter MJS rotary jet piles for reinforcement within the range of receiving abandoned shells; combining with the existing structure of the station, optimizing the construction process, and using three shutdowns to push the rectangular jacking pipe casing to the final position to achieve receiving abandoned shells, cast-in-place structure, and tunnel penetration; using flexible connections between the cast-in-place section of the abandoned shell and the prefabricated pipe section, and using wedge-shaped rubber strips, steel rings, expansion rubber, elastic rubber sealing pads, and two-component polysulfide sealants for waterproofing; using pre-buried L-shaped steel plates and sleeve valve pipe grouting on the ground connection wall to strengthen the hidden beam at the cast-in-place section of the abandoned shell and the station portal for waterproofing; the cast-in-place section of the abandoned shell fully utilizes the existing annular ribs and steel bars for welding, and pouring concrete to form an integral structure. The utility model has simple process, low construction risk, low project cost, and little impact on the surrounding environment. It can be used for receiving abandoned shells from jacking pipes under various complex strata when the surrounding environment is complex and there is no space for receiving wells.

[0078] The technical effects of the design scheme for receiving a pipe jacking shell disclosed in this embodiment are also reflected in the following important aspects:

[0079] 1. The utility model provides a feasible solution for the implementation of underground pedestrian crossings in complex surrounding environments without construction space conditions, which can greatly improve the feasibility of underground pedestrian crossings and greatly facilitate people's travel. The technical solution of the utility model is expected to bring huge social value after transformation; and the utility model can reduce the impact on the ground, and is expected to generate greater economic value for engineering risks and engineering costs.

[0080] 2. The waterproofing scheme proposed in the utility model fills the technical gap in the receiving scheme of the abandoned shell of the jacking pipe in the domestic and foreign industries, forms a complete and reliable waterproofing system, and can ensure that the structure in the receiving scheme of the abandoned shell of the jacking pipe has no leakage risk.

[0081] 3. For the construction of underground pedestrian crossings in complex surrounding environments with no construction space conditions, especially in areas like Tianjin with high groundwater levels and relatively soft soil, this abandoned shell reception method is the first application in Tianjin, successfully solving the problem of Tianjin Metro Line 2 crossing Weiguo Road without being able to set up entrances and exits for many years, causing difficulties for surrounding residents to travel by subway.

[0082] 4. The utility model overcomes the one-sided perception that it is difficult to receive abandoned shells in areas with high groundwater levels. Through soil reinforcement, rapid welding of pre-buried steel rings in the jacking pipe casing and the ground-connected wall, and flexible waterproof combination between the casing and the prefabricated pipe sections, safe and reliable excavation without support conditions is ensured during implementation.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A waterproof structure for receiving a discarded shell of a jacking pipe, characterized in that: It is used to connect the casing of the pipe jacking machine retained in the tunnel with the station door and the prefabricated pipe segment, including a flexible waterproof structure arranged between the casing of the pipe jacking machine and the prefabricated pipe segment and a water-stopping waterproof structure arranged between the casing of the pipe jacking machine and the station door, wherein: The flexible waterproof structure includes a wedge-shaped waterproof combination arranged at the socket of the pipe jacking machine casing and the prefabricated pipe segment and an elastic waterproof combination arranged at the connection between the tail annular rib plate of the pipe jacking machine casing and the cross-section of the prefabricated pipe segment; The water-stopping and waterproofing structure comprises an L-shaped steel plate arranged along the circumference of the station tunnel gate. The L-shaped steel plate is quickly welded to the casing of the pipe jacking machine and filled with grouting to form a closed water-stopping structure.

2. A waterproof structure for receiving a discarded shell of a jacking pipe according to claim 1, characterized in that: The wedge-shaped waterproof combination comprises: A steel ring is fixedly arranged at the end of the first pipe section along the circumference of the first pipe section of the prefabricated pipe section; The wedge-shaped rubber strip has a wedge-shaped cross-section and is interference-set between the casing of the pipe jacking machine and the first pipe section. The inner side surface of the wedge-shaped rubber strip is set along the circumference of the first pipe section, and the outer side surface is interference-fitted with the casing of the pipe jacking machine. The descending end abuts against the steel ring, and the ascending end abuts against the pipe section step of the first pipe section.

3. A waterproof structure for receiving a discarded shell of a jacking pipe according to claim 2, characterized in that: At least two circles of pipe section steps with gradually decreasing diameters are provided on the outer side wall of the first pipe section near the socket side along its circumference.

4. A waterproof structure for receiving a discarded shell of a jacking pipe according to claim 1, characterized in that: The elastic waterproof combination includes expansion rubber, force transmission pad, elastic rubber sealing pad and two-component polysulfide sealant at the cross-section connection between the annular rib plate at the rear of the casing and the first pipe section, and the expansion rubber, force transmission pad and two-component polysulfide sealant are arranged in sequence from the outside to the inside.

5. A waterproof structure for receiving abandoned shells of jacking pipes according to claim 4, characterized in that: The force transmission pads are nitrile cork pads, the number of which is at least two circles, and elastic rubber sealing pads are arranged between adjacent nitrile cork pads.

6. A waterproof structure for receiving a discarded shell of a jacking pipe according to claim 5, characterized in that: The expansion rubber is filled between the casing of the pipe jacking machine, the steel ring and the outermost nitrile cork pad, and the two-component polysulfide sealant is filled between the tail annular rib, the first pipe section and the innermost nitrile cork pad.

7. A waterproof structure for receiving abandoned shells of jacking pipes according to claim 5, characterized in that: The cross section of the elastic rubber sealing pad is hourglass-shaped and has a plurality of compression holes inside.

8. A waterproof structure for receiving a discarded shell of a jacking pipe according to any one of claims 1 to 7, characterized in that: A cast-in-place reinforced concrete structure is also constructed at the casing of the pipe jacking machine to form a discarded shell cast-in-place section.

9. A waterproof structure for receiving abandoned shells of jacking pipes according to claim 8, characterized in that: The annular ribs on the inner side of the casing of the pipe jacking machine are utilized to weld the outer side steel bars to the casing of the pipe jacking machine in the abandoned shell cast-in-place section, and longitudinal through steel bars are installed at the places on the inner side of the casing of the pipe jacking machine where there is no annular rib obstruction, and bolts are arranged on the casing of the pipe jacking machine to form a whole with the reinforced concrete structure.

10. A waterproof structure for receiving abandoned shells of jacking pipes according to claim 1, characterized in that: The water-stopping and waterproof structure also includes a pre-buried grouting pipe pre-buried at the stop position of the pipe jacking machine, through which cement slurry is poured into the underground continuous wall, the L-shaped steel plate and the casing of the pipe jacking machine and filled densely.

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