A pre-buried water stop device for a pipe jacking starting portal and a vertical shaft and a construction process thereof

Abstract

The application discloses a pre-buried water-stopping device for a pipe jacking starting hole and a vertical shaft and a construction process thereof, and has the structure comprising a steel sleeve ring pre-buried in a lining wall hole, a rubberized fabric plate attached to the outside of the steel sleeve ring, and an annular pressing plate for fixing the rubberized fabric plate; the steel sleeve ring, the rubberized fabric plate and the annular pressing plate are provided with corresponding mounting portions, and an installation piece is connected into the mounting portions to tightly bind the rubberized fabric plate; the water-stopping device is provided between a large-diameter power pipe jacking and a hole wall under complex stratum conditions such as deep burying, water enrichment and quicksand, and solves the risk of slurry leakage and sand gushing caused by the fact that the rubberized fabric plate and a pipe joint are tightly attached and sanded and the flange is worn due to sudden gushing in the process of long-distance and large-diameter pipe jacking.

Description

Technical Field

[0001] This invention relates to a pre-embedded water-stopping device and its construction process for pipe jacking starting tunnel portals and shafts, belonging to the field of municipal pipe jacking engineering technology. Background Technology

[0002] At present, pipe jacking technology is becoming more and more mature, and it is applicable to longer jacking distances, larger cross sections, and deeper burial depths. For pipe jacking working shafts, deep foundation pit support methods such as cast-in-place piles or diaphragm walls are often required. For example, after the large-diameter power tunnel is completed by pipe jacking in the vertical shaft, the vertical shaft can be equipped with an inner lining wall and used as a functional room for secondary use.

[0003] In situations like this, during the initial launch and jacking process of the pipe jacking machine, in complex geological formations with great depth, complex geology, and high water pressure, the water-stopping device is often only installed once. Continuous friction jacking can easily lead to gaps not sealing properly, potentially causing water and sand inrush or ground subsidence. Therefore, pipe jacking construction technology is constantly being improved and equipment is constantly being updated. The requirements for water-stopping at the exit of the working shaft during construction are becoming increasingly stringent. The effectiveness of the water-stopping is directly related to safety during construction and also has a direct impact on construction quality, surface subsidence, and jacking force. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a pre-embedded water-stopping device and its construction process for pipe jacking starting tunnel portals and shafts, thereby solving the problem.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a pre-embedded water-stopping device for the starting portal and shaft of pipe jacking, which is used to stop water in the gap between the pipe jacking section and the inner lining wall after the pipe jacking section is installed therein;

[0006] Its structure includes a steel collar pre-embedded in the opening of the inner lining wall, a curtain rubber sheet attached to the outside of the steel collar, and an annular pressure plate for fixing the curtain rubber sheet; the steel collar, the curtain rubber sheet, and the annular pressure plate are provided with corresponding mounting parts, and the curtain rubber sheet is tightened by connecting to the mounting part through a mounting component.

[0007] The fabric rubber plate has an extension end that extends into the gap between the top section tube and the steel collar for water sealing.

[0008] Preferably, the mounting component is a double-headed bolt post, which passes sequentially through the grooves reserved in the steel collar, the fabric rubber plate, and the annular pressure plate serving as the mounting part, and is fastened by a nut; wherein the grooves in the steel collar and the fabric rubber plate are threaded grooves, and the annular pressure plate is an arc-shaped groove.

[0009] Preferably, the annular pressure plate has a plurality of fan-shaped flaps distributed in a ring to support the curtain rubber plate during the jacking process to prevent the edge from flipping due to sudden pressure surge; the annular pressure plate and the fan-shaped flaps are movably connected by a hinge assembly.

[0010] Preferably, the hinge assembly includes a fixing plate spot-welded to the annular pressure plate and a hinge component, wherein the fixing plate is hinged to the fan-shaped flap via the hinge component.

[0011] Preferably, the fan-shaped flap is placed in the gap between the top section pipe and the steel collar for water sealing.

[0012] Preferably, the steel collar has an L-shaped cross-section and a water-stop steel plate is welded to its inner end; the water-stop steel plate is embedded in the inner lining wall.

[0013] Preferably, the inner ring surface of the steel sleeve is provided with multiple raised limiting steel rings, and multiple top and tail brushes are fixed on one side of the limiting steel rings; the top and tail brushes are placed in the gap between the top section pipe and the steel sleeve for water stop.

[0014] Preferably, the top tail brush is composed of multiple loose steel wires and is fixed to the inner ring surface of the steel collar by welding.

[0015] A construction process for pre-embedded waterstops in the portal and shaft of a pipe jacking starting tunnel includes the following steps:

[0016] Step 1: Lay the working shaft retaining wall inside the inner lining wall of the shaft and finish the opening of the inner lining wall to facilitate the installation of the steel collar;

[0017] Step 2: Fix the steel collar to the opening of the inner lining wall by welding and casting, and weld the water-stop steel plate to the inner end of the steel collar so that the water-stop steel plate is centered and embedded in the inner lining wall of the concrete structure.

[0018] Step 3: The screw grooves of the fabric rubber sheet and the steel collar are aligned and then inserted through several double-headed bolts. The double-headed bolts are then connected to the arc-shaped grooves on the annular pressure plate that is distributed in a ring and installed at intervals. Finally, the nuts are tightened on the annular pressure plate to achieve the purpose of fixing the steel collar, fabric rubber sheet and annular pressure plate together.

[0019] Step 4: Weld the top and tail brushes to the side of the limiting steel ring by welding, so that the top and tail brushes are arranged along the inner ring of the steel collar.

[0020] Step 5: Based on step 3, a fixing plate is welded and fixed between the two annular pressure plates, and the fan-shaped flap is movably installed on the fixing plate through a hinge.

[0021] Step 6: Install the top section pipe into the opening in the inner lining wall, and place its top tail brush, curtain rubber sheet, and fan-shaped flap in the gap between the top section pipe and the opening in the inner lining wall.

[0022] Preferably, in step 1, the retaining wall of the working well is reinforced with glass fiber reinforced steel within a 6-meter radius of the opening.

[0023] Beneficial effects

[0024] This invention provides a water-stopping device between a large-diameter power jacking pipe and the tunnel wall under complex geological conditions such as deep burial, water-rich, and quicksand. It solves the risk of grout leakage and sand inrush that may occur when the rubber sheet of the curtain cloth and the pipe section are tightly adhered and worn by sand due to sudden surge during the continuous friction jacking process of long-distance, large-diameter jacking pipe.

[0025] The construction techniques employed result in more precise initial positioning of the tunnel opening, safer connection between the main structure and the water-stopping device, and more effective sealing of the tunnel opening joints. At the same time, the top and tail brushes and the curtain rubber sheets are in close contact with the jacking pipe sections, effectively preventing grout leakage during the jacking friction process. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the pre-embedded water-stopping device for the starting portal and vertical shaft of the pipe jacking project according to the present invention;

[0028] Figure 2 For the present invention Figure 1 A schematic diagram of a partial structure;

[0029] Figure 3 This is a schematic diagram of the steel collar structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the steel collar installation structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the annular pressure plate of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the fan-shaped flap of the present invention. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] Please see Figures 1-5 The present invention provides a technical solution for a pre-embedded water-stopping device for the starting portal and shaft of pipe jacking: it is used to stop water in the gap between the top section pipe 7 and the inner lining wall 8 after installation;

[0035] Its structure includes a steel collar 1 embedded in the 8 openings of the inner lining wall, a curtain rubber plate 2 attached to the outside of the steel collar 1, an annular pressure plate 3 for fixing the curtain rubber plate 2, a fan-shaped flap 53 for preventing the edge from turning over, and a top and tail brush 6 for sealing the gaps.

[0036] The steel collar 1 has an L-shaped cross section and a water-stop steel plate 11 is welded to its inner end; the water-stop steel plate 11 is embedded in the inner lining wall 8; the inner ring surface of the steel collar 1 has two raised limiting steel rings 10, which are spaced apart to leave enough space for welding and fixing of the top and tail brush 6; and several annularly spaced threaded grooves are opened on the steel collar 1 as mounting parts.

[0037] The cord rubber plate 2 is annular, and has a threaded groove. The threaded groove of the cord rubber plate 2 and the threaded groove of the steel collar 1 are distributed at the same distance. The cord rubber plate 2 has an extension end with a certain length so that it can extend into the gap between the top section pipe 7 and the inner lining wall 8.

[0038] The annular pressure plate 3 is an arc-shaped block with two arc-shaped grooves; the annular pressure plate 3 is installed in conjunction with the curtain rubber sheet 2 along the annular shape.

[0039] The threaded grooves of the steel collar 1, the cord rubber plate 2, and the cord rubber plate 2 are corresponding to each other. They are then connected by a double-headed bolt 4, which is used as an installation component. The bolts are then tightened onto the annular pressure plate 3 with nuts to achieve the purpose of fixing the steel collar 1, the cord rubber plate 2, and the annular pressure plate 3 to each other.

[0040] The top and tail brush 6 is composed of multiple loose steel wires and is fixed to the inner ring surface of the steel collar 1 by welding, thereby filling the gap between the top section pipe 7 and the inner lining wall 8. The reason for welding the top and tail brush 6 to one side of the limiting steel ring 10 is that the protruding limiting steel ring 10 can share the pressure of the top and tail brush 6 and prevent the steel wires from detaching and falling off due to water flow impact.

[0041] Please see Figure 6The fan-shaped flap 53 is mounted on the annular pressure plate 3 via a hinge assembly; the hinge assembly includes a fixing plate 51 spot-welded to the annular pressure plate 3 and a hinge component 52. The fixing plate 51 is preferably distributed between two adjacent annular pressure plates 3 to distribute the water's thrust on the annular pressure plate 3. The hinge component 52 includes a pin with a limiting pad and a pin hole, and a locking pin 521 inserted into the pin hole. The fan-shaped flap 53 has a protrusion that is hollowed out to allow the pin to be inserted, and the fixing plate 51 has a groove corresponding to the protrusion. The fan-shaped flap 53 is hinged to the fixed plate 51 by passing a pin through the groove to the protrusion, and the pin is used to prevent the pin from slipping out and falling off. In this way, if a sudden surge of water occurs during the jacking process, the fan-shaped flap 53 will be subjected to a certain amount of force by the hinge 52 to dissipate the force. The front section of the curtain rubber plate 2 is subjected to force because the rear section is equipped with a fan-shaped flap 53, which can be used to dissipate the force. The fan-shaped flap 53 is also stuck in the gap to support the curtain rubber plate 2 and prevent the curtain rubber plate 2 from flipping over.

[0042] A construction process for pre-embedded waterstops in the portal and shaft of a pipe jacking starting tunnel includes the following steps:

[0043] Step 1: Lay the working shaft retaining wall 9 inside the inner lining wall 8 of the shaft and finish the opening of the inner lining wall 8 to facilitate the installation of the steel collar 1. Preferably, fiberglass reinforcement is used within a 6-meter range of the opening in the working shaft retaining wall 9. The main reason for using fiberglass reinforcement is its high corrosion resistance and excellent durability. When laying the working shaft retaining wall 9 inside the inner lining wall 8 of the shaft, traditional steel reinforcement is easily affected by corrosion due to the possibility of high ambient humidity and contact with water or chemicals, leading to structural damage to the wall. Fiberglass reinforcement, on the other hand, has corrosion resistance and can effectively resist the erosion of humidity, chemicals, and water, extending the service life of the wall and reducing the need for maintenance and repair.

[0044] Step 2: The steel collar 1 is fixed to the opening of the inner lining wall 8 by welding and casting. A water-stop steel plate 11 is welded to the inner end of the steel collar 1, ensuring that the water-stop steel plate 11 is centered and embedded in the concrete inner lining wall 8. This effectively and tightly connects the steel collar 1 and the water-stop steel plate 11 to the inner lining wall 8, increasing the strength and stability of the connection and improving the overall structure's seismic and vibration resistance. The welding and fixing of the water-stop steel plate 11 effectively prevents water leakage from the opening of the inner lining wall 8. Welding ensures the continuity between the water-stop steel plate 11 and the inner lining wall 8, preventing water penetration and protecting the building from water damage; and the construction process is simple and direct.

[0045] Step 3: The screw grooves of the fabric rubber sheet 2 and the steel collar 1 are aligned, and then several double-headed bolts 4 are inserted. The double-headed bolts 4 are then connected to the annular pressure plates 3, which are arranged in a ring and spaced apart, through their arc-shaped grooves. Finally, nuts are tightened onto the annular pressure plates 3 to achieve mutual fixation of the steel collar 1, fabric rubber sheet 2, and annular pressure plates 3. This rigid connection method ensures the robustness between the components, allowing them to work as a whole, enhancing the stability and resistance of the structure. The fabric rubber sheet 2, as a buffer layer between structural materials, has good water-proofing, vibration damping, and sound insulation effects. The use of double-headed bolts 4 and nuts facilitates the installation and disassembly of the structure. This method reduces construction time and the workload of workers, and is more convenient for maintenance and repair, improving project efficiency and maintainability.

[0046] Step 4: The top and tail brush 6 is welded to the side of the limiting steel ring 10 by welding, so that the top and tail brush 6 is arranged along the inner ring of the steel sleeve 1. This rigid connection can fix the top and tail brush 6 to the steel sleeve 1 to the maximum extent and adapt to the annular steel sleeve 1 to achieve excellent sealing performance.

[0047] Step 5: Based on step 3, a fixing plate 51 is welded and fixed between the two annular pressure plates 3, and the fan-shaped flap 53 is movably installed on the fixing plate 51 through the hinge 52. In this way, when the annular pressure plate 3 transmits the pressure, the fixing plate 51 can share the pressure of the two adjacent annular pressure plates 3.

[0048] Step 6: Install the top section pipe 7 into the opening of the inner lining wall 8, and place the top tail brush 6, the curtain rubber plate 2, and the fan-shaped flap 53 into the gap between the top section pipe 7 and the opening of the inner lining wall 8; then carry out the installation of the top section pipe 7.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pre-buried water stop device for a pipe jacking launching portal and a vertical shaft, used for water stopping between the gap between the inner lining wall and the top jacking pipe installed behind the inner lining wall; characterized in that: Its structure includes a steel collar pre-embedded in the opening of the inner lining wall, a curtain rubber sheet attached to the outside of the steel collar, and an annular pressure plate for fixing the curtain rubber sheet; the steel collar, the curtain rubber sheet, and the annular pressure plate are provided with corresponding mounting parts, and the curtain rubber sheet is tightened by connecting to the mounting part through a mounting component. The fabric rubber sheet has an extension end that extends into the gap between the top section tube and the steel collar for water sealing. The annular pressure plate has several fan-shaped flaps distributed in a ring to support the curtain rubber plate during the jacking process and prevent the edge from flipping due to sudden pressure surge; the annular pressure plate and the fan-shaped flaps are movably connected by a hinge assembly. The hinge assembly includes a fixing plate spot-welded to an annular pressure plate, and the fixing plate is hinged to a fan-shaped flap via a hinge component. The fan-shaped flap is placed in the gap between the top section pipe and the steel collar for water stoppage; The inner ring surface of the steel sleeve is provided with multiple raised limiting steel rings, and multiple top and tail brushes are fixed on one side of the limiting steel rings; the top and tail brushes are placed in the gap between the top section pipe and the steel sleeve for water stop. A fixing plate is welded between the two annular pressure plates to secure it. The annular pressure plate is an arc-shaped block with two arc-shaped grooves. The annular pressure plate is installed along the ring to fit the curtain rubber sheet. The hinge component includes a pin with a limiting pad and a pin hole, and a locking pin for inserting into the pin hole. The fan-shaped flap has a protrusion that is hollowed out to allow the pin to be inserted. The fixed plate has a groove corresponding to the protrusion. Thus, the fan-shaped flap can be hinged to the fixed plate by passing the pin through the groove to the protrusion. The locking pin is used to prevent the pin from slipping out and falling off. The process performed by the device includes the following steps: Step 1: Lay the working shaft retaining wall inside the inner lining wall of the shaft and finish the opening of the inner lining wall to facilitate the installation of the steel collar; Step 2: Fix the steel collar to the opening of the inner lining wall by welding and casting, and weld the water-stop steel plate to the inner end of the steel collar so that the water-stop steel plate is centered and embedded in the inner lining wall of the concrete structure. Step 3: The screw grooves of the fabric rubber sheet and the steel collar are aligned and then inserted through several double-headed bolts. The double-headed bolts are then connected to the arc-shaped grooves on the annular pressure plate that is distributed in a ring and installed at intervals. Finally, the nuts are tightened on the annular pressure plate to achieve the purpose of fixing the steel collar, fabric rubber sheet and annular pressure plate together. Step 4: Weld the top and tail brushes to the side of the limiting steel ring by welding, so that the top and tail brushes are arranged along the inner ring of the steel sleeve. Step 5: Based on step 3, weld and fix a fixed plate and hinge components between the two annular pressure plates, and the fan-shaped flap is movably installed on the fixed plate through the hinge components; Step 6: Install the top section pipe into the opening in the inner lining wall, and place its top tail brush, curtain rubber sheet, and fan-shaped flap in the gap between the top section pipe and the opening in the inner lining wall.

2. The pre-buried water stop device for the pipe jacking starting hole portal and the vertical shaft according to claim 1, characterized in that: The mounting component is a double-headed bolt post, which passes through the grooves reserved in the steel collar, the fabric rubber plate, and the annular pressure plate that serve as the mounting part, and is fastened by a nut. The grooves in the steel collar and the rubber sheet of the cord fabric are threaded grooves.

3. The pre-buried water stop device for the pipe jacking starting hole portal and the vertical shaft according to claim 1, characterized in that: The steel collar has an L-shaped cross-section and a water-stop steel plate is welded to its inner end; the water-stop steel plate is embedded in the inner lining wall.

4. The pre-buried water stop device for the pipe jacking starting hole portal and the vertical shaft according to claim 1, characterized in that: The top and tail brush is composed of multiple loose steel wires and is fixed to the inner ring surface of the steel collar by welding.

5. A pre-buried water stop device for a pipe jacking starting hole portal and a vertical shaft according to claim 1, characterized in that: In step 1, the retaining wall of the working well is reinforced with glass fiber reinforced steel within 6 meters of the opening.

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