Working well water stop reinforcing structure of large-section jacking pipe and construction method

Abstract

The working well comprises an underground diaphragm wall and a lining wall, the lining wall is located on the inner side of the underground diaphragm wall, a hole steel ring is fixedly installed at a pipe jacking hole of the lining wall in a surrounding mode, and the working well water stop reinforcing structure comprises a water stop assembly which is of an annular structure and fixedly installed at the pipe jacking hole of the lining wall in a surrounding mode, a pressure maintaining space is formed in the water stop assembly and filled with pressure maintaining liquid. The filling assembly is arranged on the inner side of the hole opening steel ring and is filled in a gap between the jacking pipe and the hole opening steel ring; and the plugging assembly is located in the working well and fixedly installed at the two ends of the jacking pipe and the hole opening steel ring. According to the water-stopping reinforcing structure, a three-layer type pipe-jacking tunnel portal water-stopping system is formed, the water-stopping effect is enhanced, sedimentation of a soil body in front of jacking of a starting well can be reduced, and construction time can be shortened and construction efficiency can be improved for special existing structures such as river dams and highways which are prone to serious sedimentation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipe jacking construction, and relates to water sealing and reinforcement of a working well of a pipe jacking, in particular to a water sealing and reinforcement structure and a construction method for a working well of a large-section pipe jacking. BACKGROUND

[0002] With the rapid development of urbanization in China, more and more mature overground facilities are developed, and underground pipeline and underground engineering construction are also increasingly widespread. The construction of underground pipelines is generally by pipe jacking method, jacking method or shallow burying and excavation method. In the case of abundant underground water, the hole door water sealing is the most important in pipe jacking construction, and will affect the safety and stability of jacking construction. However, in the construction process, there are gaps between the pipe jacking and the working well hole, and between the diaphragm wall and the inner lining wall. In the construction project, there is easy water leakage in different degrees. When long-term seepage occurs around the hole door, it will cause soil settlement in front of the hole door, water and soil loss, reduce the construction quality, and there are safety hazards. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provides a water sealing and reinforcement structure and a construction method for a working well of a large-section pipe jacking, which has good water sealing effect and high construction quality.

[0004] To solve the above problems, the technical scheme of the present application is as follows:

[0005] A water sealing and reinforcement structure for a working well of a large-section pipe jacking, the working well comprising a diaphragm wall and an inner lining wall, the inner lining wall being located on the inner side of the diaphragm wall, a hole door steel ring being fixedly installed around the pipe jacking hole of the inner lining wall, comprising:

[0006] A water sealing assembly, which is an annular structure and is fixedly installed around the pipe jacking hole of the inner lining wall, a pressure maintaining space being provided in the water sealing assembly, and the pressure maintaining space being filled with pressure maintaining liquid;

[0007] A filling assembly, which is provided on the inner side of the hole door steel ring and is filled in the gap between the pipe jacking and the hole door steel ring;

[0008] A plugging assembly, which is located in the working well and is fixedly installed on the two end portions of the pipe jacking and the hole door steel ring.

[0009] In a further embodiment, the water sealing assembly comprises an extended steel box, a folding plate and a rubber plate, the folding plate and the rubber plate being fixedly installed on the left and right sides of the extended steel box respectively, and the folding plate and the rubber plate being folded with the jacking of the pipe jacking.

[0010] In a further embodiment, the water sealing assembly further comprises a plugging plate, the extended steel box being a semi-closed structure, and the plugging plate being fixedly installed in the extended steel box and being adapted to form a pressure maintaining space in the extended steel box.

[0011] In a further embodiment, a retaining plate is fixedly installed on the inner side of the hole opening steel ring, and the water stop assembly is respectively arranged at the two end portions of the hole opening steel ring.

[0012] In a further embodiment, the filling assembly comprises an air bag, which is clamped between the retaining plate and the water stop assembly.

[0013] The air bag is connected with an inflation pipe, one side of the inflation pipe is provided with a grouting pipe, and the outlet of the grouting pipe is located on the surface of the air bag.

[0014] The inflation pipe and the grouting pipe are both located in the inner lining wall, and the outlets of the inflation pipe and the grouting pipe both extend out of the inner lining wall.

[0015] In a further embodiment, a pair of U-shaped plates are fixedly installed at the inner side of the diaphragm wall, a pair of L-shaped plates are fixedly installed at the outer side of the pair of U-shaped plates, the pair of L-shaped plates are located in the inner lining wall, and a first water stop plate is fixedly installed between the pair of L-shaped plates.

[0016] In a further embodiment, a post-pouring ring beam is arranged at each end portion of the pipe jacking, the post-pouring ring beam is located on the inner lining wall, and the side end surface of the post-pouring ring beam is flush with the side end surface of the inner lining wall.

[0017] In a further embodiment, the plugging assembly comprises a back steel plate and a second water stop plate, the back steel plate is fixedly installed at each end portion of the pipe jacking, and the second water stop plate is fixedly installed on the hole opening steel ring of the back steel plate.

[0018] In a further embodiment, the plugging assembly further comprises a hole door baffle and a water stop strip, one end portion of the hole door baffle is fixedly installed on the back steel plate, the other end portion of the hole door baffle is fixedly installed on the hole opening steel ring, the water stop strip is fixedly installed at the two end portions of the hole door baffle, and the water stop strip is also fixedly installed on the second water stop plate.

[0019] A working well water stop reinforcing construction method of a large-section pipe jacking is suitable for constructing a working well water stop reinforcing structure of a large-section pipe jacking, and comprises the following steps:

[0020] The working well is constructed, and the water stop assembly and the filling assembly are fixedly installed on the diaphragm wall and the inner lining wall;

[0021] In the jacking process of the pipe jacking, the water stop and the resistance reduction are performed through the filling assembly;

[0022] After the jacking is completed, the filling assembly is disassembled, the grouting pipe is reserved, the post-pouring ring beam is constructed, and the gap between the pipe jacking and the hole opening steel ring is water-stopped and reinforced through the grouting pipe.

[0023] Compared with the prior art, the working well water stop reinforcing construction method of the large-section pipe jacking has the following beneficial effects:

[0024] 1. This water-stopping reinforcement structure involves fixing water-stopping components, retaining plates, U-shaped plates, and L-shaped plates around the jacking pipe opening in the inner lining wall. Second water-stopping plates, portal baffles, and water-stopping strips are fixedly installed at both ends of the jacking pipe. These structures form a three-layer water-stopping system for the jacking pipe opening, which enhances the water-stopping effect. This not only reduces the settlement of the soil in front of the starting shaft, but also reduces construction time and improves construction efficiency for special existing structures, such as river dams and highways, which are prone to severe settlement.

[0025] 2. The water-stopping components of this water-stopping reinforcement structure include an extended steel box and a sealing plate. The sealing plate is fixedly installed inside the extended steel box, forming a pressure-holding space inside the extended steel box. The bolts are located in the pressure-holding space, and the pressure-holding space is filled with pressure-holding fluid to increase the pressure of the pressure-holding space and prevent water leakage at the bolt position. The extended steel box can work with rubber plates and hinge plates to perform secondary water-stopping, improving the water-stopping effect.

[0026] 3. When constructing the diaphragm wall, this water-stopping reinforcement structure includes two rows of U-shaped plates fixedly installed inside the reinforcing cage, with the U-shaped plates surrounding the jacking pipe opening; L-shaped plates are fixedly installed on the outer side of the U-shaped plates, with the L-shaped plates located inside the inner lining wall; and a first water-stopping plate is fixedly installed between a pair of L-shaped plates, which can stop the water in the construction joint between the diaphragm wall and the inner lining wall, with good water-stopping effect.

[0027] 4. This water-stopping reinforcement structure has a back steel plate fixedly installed at both ends of the jacking pipe. Grooves are made on the outer surfaces of the back steel plate and the steel ring at the opening, and a second water-stopping plate is inserted into the groove. A portal baffle is fixedly installed between the back steel plate and the steel ring at the opening. Water-stopping strips are fixedly installed between the two ends of the portal baffle and the second water-stopping plate, which is suitable for water-stopping reinforcement of the gap between the end of the jacking pipe and the opening of the jacking pipe.

[0028] 5. This water-stopping reinforcement structure incorporates an airbag between the jacking pipe and the steel ring at the tunnel entrance. The airbag is confined by retaining plates and water-stopping components, and is connected to an inflation pipe. Inflation and deflation of the airbag via the inflation pipe effectively fill the gap between the jacking pipe and the steel ring at the tunnel entrance. Grease is injected into the outer surface of the airbag through a grouting pipe to reduce drag and prevent rupture. This allows the airbag to not only provide water-stopping but also drag reduction, and its flexible inflation and deflation based on actual conditions makes it widely applicable. Furthermore, after the jacking pipe is completed, grout can be injected into the gap between the jacking pipe and the steel ring at the tunnel entrance through the grouting pipe to further enhance the water-stopping reinforcement effect. Attached Figure Description

[0029] Figure 1 A front view of a water-stopping and reinforcement structure for a working well of a large-section pipe jacking system;

[0030] Figure 2 A schematic diagram of an airbag structure for water-stopping and reinforcement of a working well in a large-section pipe jacking system;

[0031] Figure 3 A schematic diagram of a hole door baffle structure of a water stop reinforcing structure of a working well of a large-section pipe jacking;

[0032] Figure 4 A schematic diagram of a water stop assembly structure of a water stop reinforcing structure of a working well of a large-section pipe jacking;

[0033] Figure 5 A schematic diagram of a first water stop plate structure of a water stop reinforcing structure of a working well of a large-section pipe jacking;

[0034] Figure 6 A schematic diagram of a plugging plate structure of a water stop reinforcing structure of a working well of a large-section pipe jacking;

[0035] Figure 7 A flowchart of a water stop reinforcing construction method of a working well of a large-section pipe jacking.

[0036] In the figure: 1, working well; 11, diaphragm wall; 111, U-shaped plate; 112, L-shaped plate; 113, first water stop plate; 12, inner lining wall; 121, hole opening steel ring; 2, pipe jacking; 3, water stop assembly; 31, extended steel box; 32, pressure maintaining space; 33, plugging plate; 34, folding plate; 35, rubber plate; 4, air bag; 41, inflation pipe; 42, grouting pipe; 5, earth retaining plate; 6, post-poured ring beam; 7, back steel plate; 71, second water stop plate; 8, hole door baffle; 9, water stop strip. DETAILED DESCRIPTION

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0038] Example 1:

[0039] A working well water stop reinforcing structure of a large-section pipe jacking, like Figures 1 to 6As shown, it comprises several working wells 1 and a pipe jacking 2, the working wells 1 are arranged at predetermined construction positions, and the pipe jacking 2 passes through the working wells 1 in sequence, and the working well 1 at the front is the starting well, and the working well 1 at the back is the receiving well. The working well 1 comprises a diaphragm wall 11 and an inner lining wall 12, and the inner lining wall 12 is arranged inside the diaphragm wall 11. Preferably, the pipe jacking 2 is a large-section rectangular structure.

[0040] As shown, Figure 1 , Figure 4 The pipe jacking hole of the inner lining wall 12 is surrounded by a fixedly installed water stop assembly 3, the water stop assembly 3 is an annular structure and is arranged in the working well 1. The water stop assembly 3 comprises an extended steel box 31 and several blocking plates 33, and the extended steel box 31 is fixedly installed on the inner lining wall 12 by bolts; the extended steel box 31 is a semi-closed structure, and the opening of the extended steel box 31 faces the inner side of the pipe jacking hole, and several blocking plates 33 are fixedly installed in the opening of the extended steel box 31, so that a closed pressure maintaining space 32 is formed in the extended steel box 31, the cross section of the pressure maintaining space 32 is a rectangular structure, and the pressure maintaining space 32 is filled with pressure maintaining liquid; specifically, the bolts for fixing the extended steel box 31 are higher than the blocking plates 33, that is, one end of the bolt is located in the pressure maintaining space 32. As shown, Figure 6 The several blocking plates 33 are fixedly connected together by welding, and specifically, the two end portions of the blocking plate 33 are arranged as bevels, so that the connecting end portions of the adjacent two blocking plates 33 form a triangular gap, which facilitates more firm and stable welding connection. Preferably, the pressure maintaining liquid is grease, so that the pressure in the pressure maintaining space 32 is greater than or equal to the pressure of the external underground water, avoiding the leakage of underground water along the bolt. Preferably, the size of the blocking plate 33 is 20*20*2cm, and the angle of the bevels at the two end portions of the blocking plate 33 is 30° small chamfer.

[0041] As shown, Figure 4As shown, the water stop assembly 3 further comprises a pair of folding plates 34 and a pair of rubber plates 35, which are symmetrically and fixedly installed on the two side walls of the outer extension steel box 31. Specifically, the pair of folding plates 34 and the pair of rubber plates 35 can be fixedly installed on the inner side or the outer side of the outer extension steel box 31 according to the use requirements. The pair of folding plates 34 and the pair of rubber plates 35 are both fixedly installed on the outer extension steel box 31 by bolts, and one end of the bolt is located in the pressure maintaining space 32. The folding plate 34 comprises a fixed end and a hinge end, which are rotatably installed together by a hinge shaft. The fixed end of the folding plate 34 is fixedly installed on the side wall of the outer extension steel box 31, and the hinge end of the folding plate 34 extends inwardly into the pipe jacking hole. The position of the hinge shaft of the folding plate 34 corresponds to the edge position of the pipe jacking 2, so that the hinge end of the folding plate 34 can be driven forward to fold during the jacking process, thereby achieving water stop for the gap between the edge of the pipe jacking 2 and the pipe jacking hole. The rubber plate 35 comprises a fixed end and a cantilever end. The fixed end of the rubber plate 35 is fixedly installed on the side wall of the outer extension steel box 31 together with the fixed end of the folding plate 34 by bolts, and the cantilever end of the rubber plate 35 extends inwardly into the pipe jacking hole, so that the cantilever end of the rubber plate 35 can be driven forward to fold during the jacking process, thereby achieving water stop for the gap between the edge of the pipe jacking 2 and the pipe jacking hole together with the folding plate 34. The conventional folding plate 34 and the rubber plate 35 are fixedly installed on the inner lining wall 12 by bolts, and the bolt position is prone to water leakage. The outer extension steel box 31 and the pressure maintaining space 32 can perform secondary water stop, thereby avoiding the water leakage problem of the bolt position. Preferably, the bolt is an M20 bolt.

[0042] As Figure 2 、 Figure 4As shown, the inner lining wall 12 is fixedly installed around the top pipe opening, and a hole steel ring 121 is arranged at the top pipe opening, wherein the hole steel ring 121 is in a ring structure; a soil retaining plate 5 is fixedly installed on the inner side wall of the hole steel ring 121, and the soil retaining plate 5 is fixedly installed on the hole steel ring 121 through M20 bolts, and the soil retaining plate 5 is located at one end close to the diaphragm wall 11; specifically, the soil retaining plate 5 is in a ring structure, and the cross section of the soil retaining plate 5 is in an L-shaped structure, which is suitable for preventing external soil, sand and other sundries from entering the working well 1. An air bag 4 is further arranged on the inner side wall of the hole steel ring 121, the air bag 4 is located between the top pipe 2 and the hole steel ring 121, and the air bag 4 is arranged around the top pipe opening, and is limited and fixed by being clamped between the soil retaining plate 5 and the water stop assembly 3, which can not only block the leakage water, but also reduce the resistance to the top pipe 2 during the jacking process. The air bag 4 is connected with an inflation pipe 41, one side of the inflation pipe 41 is provided with a grouting pipe 42, and the inflation pipe 41 and the grouting pipe 42 are located in the inner lining wall 12. The inlet of the inflation pipe 41 and the inlet of the grouting pipe 42 extend into the working well 1, and the inflation pipe 41 can be used for inflating and deflating the air bag 4. The outlet of the grouting pipe 42 is located at the outer surface of the air bag 4, and the grouting pipe 42 can be used for injecting lubricating grease between the air bag 4 and the outer extension steel box 31. As the top pipe 2 is jacked, the grease can be evenly applied to the top end of the air bag 4, reducing the friction between the air bag 4 and the top pipe 2 and prolonging the service life of the air bag 4. Preferably, the size of the soil retaining plate 5 is 50*20*0.1 cm.

[0043] As shown in the drawings, Figure 5 A pair of U-shaped plates 111 are fixedly installed in the steel reinforcement cage of the diaphragm wall 11 along the radial direction of the top pipe opening, and the pair of U-shaped plates 111 are arranged around the circumferential side of the top pipe opening; specifically, the U-shaped plate 111 is made of channel steel. A pair of L-shaped plates 112 are symmetrically fixedly installed on the outer end faces of the pair of U-shaped plates 111, and the two are fixedly installed together by bolts; one end of the L-shaped plate 112 is located in the diaphragm wall 11, and the other end of the L-shaped plate 112 is located in the inner lining wall 12; specifically, the cross section of the L-shaped plate 112 is in an L-shaped structure. A first water stop plate 113 is fixedly installed between the pair of L-shaped plates 112, the first water stop plate 113 is in a ring structure, the cross section of the first water stop plate 113 is in a nearly U-shaped structure, and the concave side of the first water stop plate 113 faces the top pipe opening, which can solve the problem of water leakage at the construction joint between the diaphragm wall 11 and the inner lining wall 12. Preferably, the size of the U-shaped plate 111 is 12*24*1 cm, and the size of the L-shaped plate 112 is 12*24*1 cm; the U-shaped plate 111 and the L-shaped plate 112 are fixedly installed together by M27 bolts.

[0044] As shown in the drawings, Figure 3As shown, the head end and tail end of the pipe 2 are located in the receiving well and the starting well respectively, and the head end and tail end of the pipe 2 are fixedly installed with the back steel plate 7, and the inner side wall of the hole steel ring 121 is provided with a groove, and the second water stop plate 71 is inserted in the groove, and the two second water stop plates 71 are perpendicular to the back steel plate 7 and the hole steel ring 121 respectively. The head end and tail end of the pipe 2 are provided with the post-pouring ring beam 6, which is suitable for plugging and fixing the two ends of the pipe 2; the side wall of the post-pouring ring beam 6 is flush with the side wall of the lining wall 12. The inner side wall of the hole steel ring 121 is fixedly installed with the hole door baffle 8, which is an L-shaped structure, one end of the hole door baffle 8 is fixedly installed on the hole steel ring 121, the other end of the hole door baffle 8 is fixedly installed on the back steel plate 7, which is suitable for blocking the soil and underground water path between the pipe 2 and the pipe hole; the two ends of the hole door baffle 8 and the two second water stop plates 71 are fixedly installed with the water stop strip 9, which is suitable for cooperating with the second water stop plate 71 to stop water in the construction joint of the receiving well and the starting well. Specifically, the hole steel ring 121, the back steel plate 7, the second water stop plate 71, the hole door baffle 8 and the water stop strip 9 are located in the post-pouring ring beam 6. Preferably, the thickness of the second water stop plate 71 is 15 cm.

[0045] Embodiment 2:

[0046] A working well water stop reinforcement construction method of a large-section pipe, as shown in the accompanying drawings, comprises the following steps: Figure 7 As shown, the following steps are included:

[0047] S101, construct the working well 1, and fixedly install the water stop assembly 3 and the filling assembly on the diaphragm wall 11 and the lining wall 12:

[0048] The diaphragm wall 11 is constructed at a predetermined position, the lining wall 12 is constructed on the inner side of the diaphragm wall 11, and the working well 1 is formed.

[0049] When the diaphragm wall 11 is constructed, the U-shaped plate 111 is pre-buried on the side of the pipe hole, the U-shaped plate 111 is welded to the transverse main reinforcement of the steel reinforcement cage of the diaphragm wall 11, and the bolt hole of the U-shaped plate 111 is pre-plugged with M27 plastic bolts. When the lining wall 12 is subsequently constructed, the surface of the diaphragm wall 11 is roughened until the U-shaped plate 111 is exposed, the surface of the U-shaped plate 111 is cleaned, the plastic bolts are removed, the L-shaped plate 112 is fixedly installed on the U-shaped plate 111 using M27 steel bolts, and the first water stop plate 113 is fixedly welded to the L-shaped plate 112.

[0050] When the pipe hole of the lining wall 12 is constructed, high-strength bolt bases are pre-buried, the bases are arranged in a circle around the hole, and the bases are arranged in two rows with the same spacing as the outer extension steel box 31. When the soil retaining plate 5 is installed, the reserved bolt hole of the soil retaining plate 5 is aligned with the high-strength bolt base, and the soil retaining plate 5 is fixed by bolts, and the adjacent steel plate joint is synchronously welded to prevent water leakage.

[0051] The air bag 4 is arranged between the pipe jacking 2 and the pipe jacking hole, and is located between the retaining board 5 and the water stop assembly 3, and is limited by the retaining board 5 and the water stop assembly 3; the water stop assembly 3 is fixedly installed on the top of the inner lining wall 12 of the pipe jacking hole.

[0052] S103, during the jacking process of the pipe jacking 2, the water stop and resistance reduction are performed by the filling assembly:

[0053] During the jacking process of the pipe jacking 2, the air bag 4 is inflated by the inflation pipe 41, and the outer surface of the air bag 4 is injected with grease by the grouting pipe 42 to reduce resistance; according to the actual jacking condition of the pipe jacking 2, the air bag 4 is filled to 50%-100% to reduce the resistance of the pipe jacking 2.

[0054] S105, after the jacking is completed, the filling assembly is disassembled, the grouting pipe 42 is reserved, and after the post-pouring ring beam 6 is constructed, the gap between the pipe jacking 2 and the hole ring 121 is water-stopped and reinforced by the grouting pipe 42:

[0055] After the jacking of the pipe jacking 2 is completed, the air bag 4 is disassembled and the inflation pipe 41 is closed.

[0056] The back steel plate 7, the second water stop plate 71, the hole door baffle 8 and the water stop strip 9 are fixedly installed at both ends of the pipe jacking 2, and the post-pouring ring beam 6 is constructed at both ends of the pipe jacking 2, and the back steel plate 7, the second water stop plate 71, the hole door baffle 8, the water stop strip 9 and the folded part of the water stop assembly 3 are poured in the post-pouring ring beam 6. After the post-pouring ring beam 6 is constructed, the soil between the pipe jacking 2 and the pipe jacking hole, i.e. the soil at the position of the original air bag 4, is grouted by the grouting pipe 42 to complete the water stop and reinforcement.

[0057] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A working well water stop reinforcement structure of a large-section pipe jacking, a working well (1) comprising a diaphragm wall (11) and an inner lining wall (12), the inner lining wall (12) being located inside the diaphragm wall (11), a steel ring (121) being fixedly installed around a pipe jacking opening at the inner lining wall (12), characterized in that, The utility model relates to a kind of top tube construction technology, including: Water stop component (3), annular structure, around fixedly installed at the top pipe hole mouth of the inner lining wall (12), the pressure-maintaining space (32) is arranged in the water stop component (3), the pressure-maintaining space (32) is filled with pressure-maintaining liquid; Filling assembly, it is arranged in the inside of the hole mouth steel ring (121), and fill the gap between the top pipe (2) and the hole mouth steel ring (121); Plugging assembly, located in the working well (1), the plugging assembly is fixedly installed on the both ends of the top pipe (2) and the hole mouth steel ring (121).

2. The working shaft water stop reinforcement structure of a large-section pipe jacking according to claim 1, characterized in that, The water stop component (3) includes extension steel box (31), folding plate (34) and rubber plate (35), the left and right two sides of the extension steel box (31) are fixedly installed folding plate (34) and rubber plate (35) respectively, folding plate (34) and rubber plate (35) are folded with the jacking of the top pipe (2).

3. The working shaft water stop reinforcement structure of a large-section pipe jacking according to claim 2, characterized in that, The water stop component (3) further includes blocking plate (33), the extension steel box (31) is half-closed structure, the blocking plate (33) is fixedly installed in the extension steel box (31), is suitable for forming the pressure-maintaining space (32) in the extension steel box (31).

4. A working shaft sealing reinforcement structure for a large-diameter pipe jacking according to any one of claims 1 to 3, characterized in that, The inner side of the hole mouth steel ring (121) is fixedly installed with retaining plate (5), and the retaining plate (5) and the water stop component (3) are located at the both ends of the hole mouth steel ring (121) respectively.

5. The working shaft water stop reinforcement structure of a large-section pipe jacking according to claim 4, characterized in that, The filling assembly includes air bag (4), the air bag (4) is clamped between the retaining plate (5) and the water stop component (3); The air bag (4) is connected with inflator pipe (41), one side of the inflator pipe (41) is provided with grouting pipe (42), and the outlet of the grouting pipe (42) is located on the surface of the air bag (4). Lubricating grease is injected onto the surface of the air bag (4) through the grouting pipe (42). The inflator pipe (41) and the grouting pipe (42) are located in the inner lining wall (12), and the outlets of the inflator pipe (41) and the grouting pipe (42) extend out of the inner lining wall (12).

6. The working shaft water stop reinforcement structure of a large-section pipe jacking according to any one of claims 1 to 3, characterized in that, A pair of U-shaped plates (111) are fixedly installed on the inner side of the diaphragm wall (11), a pair of L-shaped plates (112) are fixedly installed on the outer sides of the pair of U-shaped plates (111), one pair of L-shaped plates (112) are located in the inner lining wall (12), and a first water stop plate (113) is fixedly installed between the pair of L-shaped plates (112).

7. A working shaft sealing reinforcement structure for a large-diameter pipe jacking according to any one of claims 1 to 3, characterized in that, Post-cast circle beams (6) are arranged at the both ends of the top pipe (2), the post-cast circle beams (6) are located on the inner lining wall (12), and the side end faces of the post-cast circle beams (6) are flush with the side end faces of the inner lining wall (12).

8. The working shaft water stop reinforcement structure of a large-section pipe jacking according to claim 7, characterized in that, The plugging assembly includes back steel plate (7) and second water stop plate (71), the back steel plate (7) is fixedly installed at the both ends of the top pipe (2), and the second water stop plate (71) is fixedly installed on the back steel plate (7) and the hole mouth steel ring (121) respectively.

9. The working shaft water stop reinforcement structure of a large-section pipe jacking according to claim 8, characterized in that, The sealing assembly further comprises a door baffle (8) and a water stop (9), one end of the door baffle (8) is fixedly installed on the back steel plate (7), the other end of the door baffle (8) is fixedly installed on the hole steel ring (121), the two ends of the door baffle (8) are respectively fixedly installed with the water stop (9), and the water stop (9) is further fixedly installed on the second water stop plate (71).

10. A working well water sealing and reinforcing construction method of a large-section pipe jacking, characterized in that, A working well sealing and reinforcing structure suitable for construction of a large-section pipe jacking, such as the one described in any one of claims 1 to 9, comprises the following steps: The working well (1) is constructed, and the sealing assembly (3) and the filling assembly are fixedly installed on the diaphragm wall (11) and the inner lining wall (12); During jacking of the pipe (2), water sealing and resistance reduction are performed by the filling assembly; After jacking is completed, the filling assembly is disassembled, the grouting pipe (42) is retained, and after the post-cast circle beam (6) is constructed, the gap between the pipe (2) and the hole steel ring (121) is sealed and reinforced by the grouting pipe (42).

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