A water stop device and construction method for the starting shaft opening of a pipe jacking using the open caisson method

Abstract

The present application discloses a water stop device and a construction method for the starting hole of a pipe jacking starting shaft by the open caisson method. The water stop device includes a steel sleeve and a water stop member. The steel sleeve is pre-buried at the position of the reserved hole in the shaft wall of the starting shaft. An installation ring is fixedly connected to the inner wall of the steel sleeve. A plurality of bolts are vertically fixedly connected to the side wall of the installation ring facing the air side of the starting shaft. The water stop member includes a steel ring cushion block and water stop assemblies on both sides of the steel ring cushion block. A plurality of bolts all pass through the steel ring cushion block. The water stop assembly includes a rubber curtain and steel ring clips abutting on both sides of the rubber curtain. A plurality of bolts all pass through the rubber curtain and the steel ring clips. The rubber curtain abuts on the outer wall of the pipe joint. An external locking nut is threadedly connected to the bolt. The present application solves the problems in the prior art that when the rubber curtain is torn and damaged, it is difficult to replace the rubber curtain, the water stop effect is poor in the face of suddenly increased groundwater pressure, and the construction period is prolonged by pouring a pre-water stop wall when installing the water stop device in a circular starting shaft working shaft, etc.

Description

Technical Field

[0001] The present application relates to the field of water stop for openings, and in particular to a water stop device and construction method for the opening of a pipe jacking launching shaft by the open caisson method. Background Art

[0002] In pipe jacking construction, there is a certain gap between the pipe segment and the opening of the working shaft. When the pipe segment is jacked, if the gap is not treated for water stop, groundwater and sediment will flow into the working shaft through this gap, thus affecting the normal operation in the working shaft. Seriously, it will cause the collapse of the soil body above the opening, and even affect the safety of surrounding buildings and underground pipelines. Therefore, the water stop for the opening of the pipe jacking project is very important. The conventional water stop method is mainly realized by a rubber curtain.

[0003] However, in the process of implementing the inventive technical solution in the embodiments of the present application, the inventors found at least the following technical problems: when the pipe segment jacking causes the rubber curtain to be torn and damaged, it is difficult to replace the rubber curtain in the conventional water stop method; for pipe jacking projects under rainy seasons and crossing rivers, when the groundwater pressure suddenly increases, water seepage may occur in the conventional water stop method; for circular working shafts, when installing the rubber curtain of the conventional water stop device, a bow-shaped concrete water stop wall needs to be cast in the reserved opening of the circular working shaft, and the rubber curtain of the water stop ring is installed on a plane. However, the casting and forming of the concrete water stop wall requires a certain period, which will increase the construction period of the pipe jacking project. Summary of the Invention

[0004] The embodiments of the present application provide a water stop device and construction method for the opening of a pipe jacking launching shaft by the open caisson method, which solve the problems in the prior art that when the rubber curtain is torn and damaged, it is difficult to replace the rubber curtain, the water stop effect is poor in the face of sudden increase in groundwater pressure, and the construction period is prolonged due to the need to cast the front water stop wall when installing the water stop device for the circular launching shaft working shaft.

[0005] An embodiment of the present application provides a water-stop device for the opening of a pipe jacking starting shaft constructed by the open caisson method, which includes a steel sleeve and a water-stop member. The steel sleeve is embedded at the position of a reserved opening in the shaft wall of the starting shaft. An installation ring is fixedly connected to the inner wall of the steel sleeve. The pipe section in the starting shaft passes through the installation ring. A plurality of bolts evenly distributed along the circumference of the installation ring are perpendicularly fixedly connected to the side wall of the installation ring facing the air-facing surface of the starting shaft. The water-stop member includes a steel ring cushion block located on the side of the installation ring facing the air-facing surface of the starting shaft and water-stop assemblies located on both sides of the steel ring cushion block. A plurality of the bolts all pass through the steel ring cushion block. The water-stop assembly includes a rubber curtain and steel ring clips abutting against both sides of the rubber curtain. A plurality of the bolts all pass through the rubber curtain and the steel ring clips. The rubber curtain abuts against the outer wall of the pipe section. An outer locking nut is threadedly connected to the bolt, and the outer locking nut abuts against the outermost steel ring clip in the outermost water-stop assembly facing the air-facing surface of the starting shaft.

[0006] Further, the steel ring cushion block includes a pad ring for the bolt to pass through and a convex ring integrally formed on the inner wall of the pad ring. The convex ring is coplanar with the side surface of the pad ring facing the installation ring, and the width of the convex ring is less than the width of the pad ring. A rubber airbag is bonded between the inner wall of the pad ring and the side wall of the convex ring. A wire routing hole for the air pipe of the rubber airbag is provided on the pad ring.

[0007] Further, a counterbore for the bolt to pass through is provided on the side wall of the steel ring cushion block facing the air-facing surface of the starting shaft, and an inner locking nut threadedly connected to the bolt is arranged in the counterbore.

[0008] Further, a first embedded ring and a second embedded ring are fixedly connected to the outer wall of the steel sleeve, and both the first embedded ring and the second embedded ring are embedded in the shaft wall of the starting shaft.

[0009] Further, a plurality of reinforcing members are fixedly connected to the side wall of the installation ring away from the bolts. The reinforcing members include columns vertically fixed to the side wall of the installation ring and inclined columns arranged and fixedly connected between the ends of the columns and the side wall of the installation ring. A plurality of the inclined columns are provided and evenly distributed along the circumference of the column. A plurality of the reinforcing members are evenly distributed along the circumference of the installation ring. The reinforcing members are used for masonry together with the sealing bricks to be used for sealing the steel sleeve before the steel sleeve sinks.

[0010] Further, the side edge of the rubber curtain away from the steel sleeve is located below the steel ring clip and extends into the jacking direction of the pipe section.

[0011] The present application also provides a construction method for the water-stop device for the opening of a pipe jacking starting shaft constructed by the open caisson method. The construction method includes:

[0012] S1, pre-embedded steel sleeve: when the starting well is prefabricated, the steel sleeve is pre-embedded in the reserved hole of the starting well wall, and the pre-embedded ring 1 and the pre-embedded ring 2 on the outer circumference of the steel sleeve are pre-embedded in the starting well wall, and connected with the stress-bearing steel bars in the starting well wall;

[0013] S2, sealing bricks and sealing steel sleeves: After the steel sleeve of the launching well is pre-buried, the steel sleeve is sealed with sealing bricks, and the sealing bricks at one end of the steel sleeve facing the free surface of the launching well are laid on the reinforcement member;

[0014] S3, sinking the launch well: sinking the prefabricated launch well and making the steel sleeve located at the pipe joint jacking position;

[0015] S4, breaking the sealing bricks in the steel sleeve: after the launch well is sunk, the sealing bricks in the steel sleeve are broken;

[0016] S5, install the water stop: first install the inner water stop assembly, then install the steel ring gasket and the rubber airbag, then tighten the inner locking nut, then install the outer water stop assembly, and finally tighten the outer locking nut;

[0017] S6, pipe joint jacking water stop, including the following three situations:

[0018] S61, normal working condition: the pipe segments are pushed into the steel sleeve in sequence, and the rubber curtains in the water-stop components on both sides are used to abut against the outer wall of the pipe segment;

[0019] S62, sudden increase in groundwater pressure: inflate the rubber airbag until it hits the outer wall of the pipe segment;

[0020] S63, the rubber curtain is damaged: Unscrew the outer locking nut, remove the outer water stop assembly, and replace the rubber curtain in the outer water stop assembly.

[0021] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] 1. Due to the use of a water-stop device, when the pipe segment is pushed forward, the rubber curtains in the inner and outer water-stop components can be used to seal the pipe segment and the steel sleeve, thereby preventing groundwater from entering the tube mouth. However, the rubber curtains in the water-stop components will be damaged due to the continuous advancement of the pipe segment for a long time. Therefore, the water-stop components of the outermost group can be disassembled and the rubber curtains in the outer water-stop components can be replaced. During the replacement process, the rubber curtains in the inner water-stop components can still seal the pipe segment, making it easy to replace the rubber curtains. During the replacement process, the sealing of the hole can still be guaranteed.

[0023] 2. Since a rubber airbag is adopted, when the groundwater pressure suddenly increases, the rubber airbag can be inflated and then made to abut against the outer wall of the pipe section, thereby increasing the sealing performance between the pipe section and the steel sleeve.

[0024] 3. Due to the pre-embedding of the steel sleeve and the installation of the water stop assembly inside the steel sleeve, after the launching shaft sinks, there is no need to pour a concrete water stop wall at the opening to install the water stop parts, thus reducing the construction period and ensuring the normalization of the construction period of the pipe jacking project. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the launching shaft in the water stop device in the embodiment of the present application;

[0026] Figure 2 Schematic diagram of the structure among the pipe section, the water stop device and the launching shaft in the embodiment of the present application;

[0027] Figure 3 Exploded structure schematic diagram of the water stop device in the embodiment of the present application, mainly showing the installation of the water stop device;

[0028] Figure 4 is Figure 2 Cross-sectional schematic diagram, mainly showing the overall structure of the water stop device in the launching shaft;

[0029] Figure 5 is Figure 4 Schematic diagram of a part of the structure in

[0030] Figure 6 Flow chart of the construction method of the water stop device at the opening of the pipe jacking launching shaft by the launching shaft method in the present application.

[0031] In the figure: 100, launching shaft; 200, pipe section; 300, river; 400, pipe jacking pipeline; 01, water stop device; 1, steel sleeve; 11, installation ring; 12, bolt; 121, outer locking nut; 122, inner locking nut; 13, first embedded ring; 14, second embedded ring; 2, water stop piece; 21, steel ring cushion block; 2101, counterbore; 211, gasket ring; 2111, wire passing hole; 212, convex ring; 22, water stop assembly; 221, rubber curtain; 222, steel ring clamp; 23, rubber airbag; 3, reinforcement member; 31, column; 32, inclined column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The embodiment of the present application discloses a water-stopping device and construction method for the starting hole of a caisson method construction pipe jacking. When the pipe segment 200 is pushed forward, the rubber curtains 221 in the inner and outer groups of water-stopping components 22 can be used to seal the pipe segment 200 and the steel sleeve 1, thereby preventing groundwater from entering the sleeve mouth. If the pipe segment 200 is pushed forward continuously for a long time, the rubber curtains 221 in the water-stopping components 22 will be damaged. Therefore, the water-stopping components 22 of the outermost group can be disassembled and the rubber curtains 221 in the outer water-stopping components 22 can be replaced. During the replacement process, the rubber curtains 221 in the inner water-stopping components 22 can still seal the pipe segment 200.

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0034] Embodiment 1

[0035] Reference Figure 1 and Figure 2 It is a water-stopping device for the opening of a jacking shaft in the caisson method in the embodiment of the present application. The water-stopping device 01 includes a steel sleeve 1 and a water-stopping member 2. The steel sleeve 1 is pre-buried in the position of the reserved opening on the wall of the starting shaft 100. After the starting shaft 100 sinks, the position of the reserved opening of the starting shaft 100 is located below the river channel 300. A shield machine is used to open up from the opening in the starting shaft 100 to the other side below the river channel 300 to construct a jacking pipe 400 under the river. During the construction process, multiple pipe sections 200 are continuously pushed into the opening to form the jacking pipe 400. The water-stopping member 2 is installed in the steel sleeve 1, and the water-stopping member 2 is located between the steel sleeve 1 and the pipe section 200.

[0036] Reference Figure 2 , Figure 3 , Figure 4 as well as Figure 5 The length of the steel sleeve 1 can be consistent with the thickness of the well wall of the starting well 100. The end faces of the steel sleeve 1 at both ends are flush with the well walls on both sides of the starting well 100. A mounting ring 11 is fixedly connected to the inner wall of the steel sleeve 1. The pipe section 200 in the starting well 100 passes through the mounting ring 11. In addition, a plurality of bolts 12 are vertically fixedly connected to the side wall of the mounting ring 11 facing the empty surface of the starting well 100. The plurality of bolts 12 are evenly distributed along a circle of the mounting ring 11.

[0037] Continue to refer to Figure 2 , Figure 3 , Figure 4 as well as Figure 5The water stop 2 includes a steel ring gasket 21, two sets of water stop components 22 and a rubber airbag 23. The two sets of water stop components 22 are respectively located on both sides of the steel ring gasket 21. The steel ring gasket 21 includes an integrally formed gasket ring 211 and a convex ring 212. The axis of the gasket ring 211 is colinear with the axis of the steel sleeve 1. Several bolts 12 pass through the gasket ring 211. The convex ring 212 is integrally formed on the inner circumference of the gasket ring 211. The convex ring 212 is coplanar with the side surface of the gasket ring 211 close to the mounting ring 11. The rubber airbag 23 is bonded between the inner circumference of the gasket ring 211 and the side wall of the convex ring 212. The gasket ring 211 is provided with a routing hole 2111 for routing the air pipe of the rubber airbag 23. In addition, a countersunk hole 2101 for the bolt 12 to pass through is provided on the side wall of the gasket 211 facing the air surface of the launching well 100, and an internal locking nut 122 is provided in the countersunk hole 2101 and is threadedly connected to the bolt 12. The internal locking nut 122 can be used to lock the inner water stop assembly 22 and the steel ring gasket 21, so that when the outer water stop assembly 22 is replaced, the internal locking nut 122 can be used to ensure the stability of the inner water stop assembly 22 and the steel ring gasket 21 to ensure the sealing of the hole.

[0038] Continue to refer to Figure 3 , Figure 4 as well as Figure 5 The water stop assembly 22 includes a rubber curtain 221 and two steel ring clamps 222. The two steel ring clamps 222 are respectively located on both sides of the rubber curtain 221. The cross section of the rubber curtain 221 is L-shaped. The horizontal edge of the L-shaped rubber curtain 221 abuts against the outer peripheral surface of the pipe joint 200. The vertical edge of the rubber curtain 221 is located between the steel ring clamps 222 on both sides. Several bolts 12 pass through the rubber curtain 221 and the steel ring clamps 222. In addition, an external locking nut 121 is threadedly connected to the bolt 12, and the external locking nut 121 abuts against the outermost steel ring clamp 222 of the water stop assembly 22 on the outermost side of the launch well 100 facing the air surface.

[0039] Reference Figure 5 As shown, an embedded ring 13 and an embedded ring 2 14 are fixedly connected to the outer circumferential surface of the steel sleeve 1. The embedded ring 13 and the embedded ring 2 14 are both embedded in the inner wall of the starting well 100. The embedded ring 13 and the embedded ring 2 14 can increase the firmness between the steel sleeve 1 and the starting well 100 to reduce the possibility of the steel sleeve 1 detaching from the starting well 100.

[0040] Reference Figure 5As shown, a plurality of reinforcing members 3 are fixedly connected to the side wall of the mounting ring 11 away from the bolt 12, and the plurality of reinforcing members 3 are evenly distributed along the circumference of the mounting ring 11. The reinforcing members 3 include a column 31 vertically fixed to the side wall of the mounting ring 11, an inclined column 32 obliquely arranged and fixed between the end of the column 31 and the side wall of the mounting ring 11, and a plurality of inclined columns 32 are arranged and evenly distributed along the circumference of the column 31. The plurality of reinforcing members 3 are evenly distributed along the circumference of the mounting ring 11, and the reinforcing members 3 are used to be built together with the sealing bricks used to seal the steel sleeve 1 before the steel sleeve 1 sinks. Since the reinforcing members 3 are provided, not only the firmness of the mounting ring 11 can be improved, but also the sealing bricks can be built on the reinforcing members 3 when the sealing bricks are built, so that there is no need to add steel parts in the steel sleeve 1 to support the sealing bricks, thereby reducing the cost and space occupation.

[0041] To sum up: when the pipe segment 200 is pushed forward, the rubber curtain 221 in the inner and outer sets of water-stopping components 22 can be used to seal the pipe segment 200 and the steel sleeve 1, thereby preventing groundwater from entering the cave entrance. During a long construction period, several pipe segments 200 need to be continuously pushed into the cave entrance. Due to the long-term pushing, the rubber curtain 221 in the water-stopping component 22 will be worn. Therefore, the outermost locking nut 121 can be unscrewed, and the rubber curtain 221 in the outermost water-stopping component 22 can be disassembled and replaced. During the replacement process, the rubber curtain 221 in the inner water-stopping component 22 can still seal the pipe segment 200, which makes it easy to replace the rubber curtain 221, and during the replacement process, the sealing of the cave entrance can still be guaranteed.

[0042] In addition, when the underground water pressure suddenly increases, the rubber airbag 23 can be inflated, and then the rubber airbag 23 can be made to contact the outer wall of the pipe joint 200, so as to increase the sealing between the pipe joint 200 and the steel sleeve 1. Secondly, since the steel sleeve 1 is pre-buried in the starting well 100 before the starting well 100 sinks, and the water-stop assembly 22 is installed in the steel sleeve 1 later, after the starting well 100 sinks, there is no need to cast a concrete water-stop wall at the hole to install the water-stop components, so the construction period can be reduced to ensure the normalization of the construction period of the jacking project.

[0043] Embodiment 2

[0044] The present application also provides a construction method for a water-stop device for the start-up well opening of a caisson method. The use method is combined with the above-mentioned water-stop device, and the water-stop device is used as a reference. Figure 6 As shown, the construction method includes:

[0045] S1: Embedded steel sleeve 1.

[0046] In a specific implementation, the steel sleeve 1 is pre-embedded at the reserved hole of the wall of the launching shaft 100. During the pre-embedding process, the reinforcement bars at the hole are first tied, then the formwork at the hole is installed, and finally the concrete at the hole is poured. In addition, the first embedded ring 13 and the second embedded ring 14 on the outer peripheral surface of the steel sleeve 1 are also pre-embedded into the wall of the launching shaft 100 and are connected to the stress-bearing steel bars in the wall of the launching shaft 100.

[0047] In a specific implementation, before pre-embedding, the diameter of the steel sleeve 1 is determined by the construction engineering design department according to the diameter of the pipe section 200. When the outer diameter of the pipe section 200 is 3 m, the outer diameter of the steel sleeve 1 can be 3.6 m, and the thickness of the steel sleeve 1 can be 0.05 m. The length of the steel sleeve 1 can be the same as the wall thickness of the launching shaft 100. In addition, the outer diameters of the first embedded ring 13 and the embedded ring can be 3.8 m, and the width can be 0.06 m.

[0048] S2: Seal the steel sleeve 1 with a sealing brick.

[0049] In a specific implementation, after the pre-embedding of the steel sleeve 1 in the launching shaft 100 is completed, the two ends of the steel sleeve 1 are blocked with sealing bricks, and the sealing bricks at one end of the steel sleeve 1 are built onto the reinforcement member 3. By using the sealing bricks, it can be ensured that the steel sleeve 1 is in a sealed state before sinking, preventing groundwater from entering the launching shaft 100.

[0050] S3: Sink the launching shaft 100.

[0051] In a specific implementation, the prefabricated launching shaft 100 is sunk, and the steel sleeve 1 is located at the jacking position of the pipe section 200.

[0052] S4: Break the sealing brick inside the steel sleeve 1.

[0053] In a specific implementation, after the launching shaft 100 sinks, the sealing brick in the steel sleeve 1 is broken, and the inside of the steel sleeve 1 is emptied to prepare for the subsequent installation of the water stop member 2 and the jacking of the pipe section 200.

[0054] S5: Install the water stop member 2.

[0055] In a specific implementation, first, the inner water stop assembly 22 is installed, then the steel ring cushion block 21 and the rubber airbag 23 are installed, then the inner locking nut 122 is tightened, then the outer water stop assembly 22 is installed, and finally the outer locking nut 121 is tightened. Among them, when installing the water stop assembly 22, first insert the inner steel ring clip 222 onto the bolt 12, then insert the rubber curtain 221 onto the bolt 12, and finally insert the outer steel ring clip 222 onto the bolt 12, and make the side of the rubber curtain 221 away from the steel sleeve 1 located below the steel ring clip 222 and extend into the jacking direction of the pipe section 200.

[0056] S6: Pipe segment 200 is pushed in to stop water, wherein the process of pushing in to stop water includes the following three situations:

[0057] S61, normal working condition: the pipe segment 200 is pushed into the steel sleeve 1 in sequence, and the rubber curtains 221 in the water-stop components 22 on the inner and outer sides are used to contact the outer wall of the pipe segment 200, so that the two groups of water-stop components 22 can be sealed and waterproofed at the same time during the pushing process of the pipe segment 200, thereby improving the sealing of the hole.

[0058] S62, sudden increase in groundwater pressure: When the groundwater pressure suddenly increases, the construction personnel can inflate the rubber airbag 23 in the starting well 100 until the rubber airbag 23 hits the outer wall of the pipe joint 200, thereby increasing the sealing area between the pipe joint 200 and the steel sleeve 1, and improving the sealing of the cave opening to cope with the sudden increase in groundwater pressure.

[0059] S63, the rubber curtain 221 is damaged: due to the long-term continuous pushing of the pipe segment 200, the rubber curtain 221 will be worn. At this time, the outer locking nut 121 can be unscrewed, the outer water-stop assembly 22 can be removed, and the rubber curtain 221 in the outer water-stop assembly 22 can be replaced. During the replacement process of the outer water-stop assembly 22, the inner water-stop assembly 22 can still ensure the sealing of the hole.

[0060] What has been described above is only a preferred specific implementation manner of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A water stop device for the starting shaft opening of a pipe jacking constructed by the open caisson method, characterized in that, It includes a steel sleeve (1) and a water stop member (2). The steel sleeve (1) is embedded at the position of the reserved hole in the wall of the launching shaft (100). An installation ring (11) is fixedly connected to the inner wall of the steel sleeve (1). The pipe section (200) in the launching shaft (100) passes through the installation ring (11). A plurality of bolts (12) evenly distributed along the circumference of the installation ring (11) are perpendicularly fixedly connected to the side wall of the installation ring (11) facing the free surface of the launching shaft (100). The water stop member (2) includes a steel ring cushion block (21) located on the side of the installation ring (11) facing the free surface of the launching shaft (100), and water stop assemblies (22) located on both sides of the steel ring cushion block (21). A plurality of the bolts (12) all pass through the steel ring cushion block (21). The water stop assembly (22) includes a rubber curtain (221) and steel ring clips (222) abutted against both sides of the rubber curtain (221). A plurality of bolts (12) all pass through each rubber curtain (221) and each steel ring clip (222). Each rubber curtain (221) abuts against the outer wall of the pipe section (200). An external locking nut (121) is threadedly connected to the bolt (12), and the external locking nut (121) abuts against the outermost steel ring clip (222) in the outermost water stop assembly (22) on the side of the launching shaft (100) facing the free surface. The steel ring cushion block (21) includes a pad ring (211) for the bolt (12) to pass through, and a convex ring (212) integrally formed on the inner wall of the pad ring (211). The convex ring (212) is coplanar with the side surface of the pad ring (211) facing the installation ring (11), and the width of the convex ring (212) is less than the width of the pad ring (211). A rubber airbag (23) is bonded between the inner wall of the pad ring (211) and the side wall of the convex ring (212). A wire routing hole (2111) for the air pipe of the rubber airbag (23) is provided on the pad ring (211).

2. The water stop device for the starting shaft opening of the pipe jacking constructed by the open caisson method as described in claim 1, characterized in that, A counterbore (2101) for the bolt (12) to pass through is provided on the side wall of the steel ring cushion block (21) facing the free surface of the launching shaft (100). An internal locking nut (122) threadedly connected to the bolt (12) is arranged in the counterbore (2101).

3. The water stop device for the starting shaft opening of the pipe jacking constructed by the open caisson method according to claim 1, wherein, An embedded ring one (13) and an embedded ring two (14) are fixedly connected to the outer wall of the steel sleeve (1). The embedded ring one (13) and the embedded ring two (14) are both embedded in the wall of the launching shaft (100).

4. The water stop device for the opening of the pipe jacking launching shaft constructed by the open caisson method as described in claim 1, characterized in that, A plurality of reinforcing members (3) are fixedly connected to the side wall of the mounting ring (11) on the side away from the bolt (12). The reinforcing members (3) include columns (31) vertically fixed to the side wall of the mounting ring (11), and inclined columns (32) disposed obliquely and fixedly connected between the ends of the columns (31) and the side wall of the mounting ring (11). A plurality of the inclined columns (32) are provided and are uniformly distributed along the circumference of the column (31). The plurality of reinforcing members (3) are uniformly distributed along the circumference of the mounting ring (11). The reinforcing members (3) are used for being masonry together with the sealing bricks for sealing the steel sleeve (1) before the steel sleeve (1) sinks.

5. The water stop device for the opening of the pipe jacking launching shaft constructed by the open caisson method as described in claim 1, characterized in that, One side edge of the rubber curtain (221) in each water stop assembly (22) away from the steel sleeve (1) is located below the steel ring clip (222) and extends into the jacking direction of the pipe section (200).

6. A construction method of a water stop device for the starting shaft opening of a pipe jacking using the open caisson method, characterized in that, Adopt a water stop device for the starting shaft opening of a pipe jacking construction by the open caisson method according to any one of claims 1-5. The construction method includes: S1, pre-embed the steel sleeve (1): When prefabricating the starting shaft (100), pre-embed the steel sleeve (1) at the reserved hole of the wall of the starting shaft (100), and pre-embed the first pre-embedded ring (13) and the second pre-embedded ring (14) on the outer peripheral surface of the steel sleeve (1) into the wall of the starting shaft (100), and connect them with the stress reinforcement bars in the wall of the starting shaft (100); S2, seal the steel sleeve (1) with sealing bricks: After the steel sleeve (1) of the starting shaft (100) is pre-embedded, use the sealing bricks to block the steel sleeve (1), and make the sealing bricks at the end of the steel sleeve (1) facing the air-facing surface of the starting shaft (100) be masonry on the reinforcing members (3); S3, sink the starting shaft (100): Sink the prefabricated starting shaft (100) so that the steel sleeve (1) is located at the jacking position of the pipe section (200); S4, break the sealing bricks in the steel sleeve (1): After the starting shaft (100) sinks, break the sealing bricks in the steel sleeve (1); S5, install the water stop member (2): First install the inner water stop assembly (22), then install the steel ring cushion block (21) and the rubber air bag (23), then lock the inner locking nut (122), then install the outer water stop assembly (22), and finally lock the outer locking nut (121); S6, water stop for the pipe jacking of the pipe section (200), including the following three situations: S61, normal working condition: The pipe section (200) jacks into the steel sleeve (1) in sequence, and the rubber curtains (221) in the inner and outer water stop assemblies (22) are used to abut against the outer wall of the pipe section (200); S62, sudden increase in groundwater pressure: Inflate the rubber air bag (23) until the rubber air bag (23) abuts against the outer wall of the pipe section (200); S63, damage to the rubber curtain (221): Unscrew the outer locking nut (121), remove the outer water stop assembly (22), and replace the rubber curtain (221) in the outer water stop assembly (22).

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