A reinforced concrete pipe joint structure suitable for high water pressure conditions

Abstract

The application provides a reinforced concrete pipe jacking interface structure suitable for high water pressure conditions and relates to the field of pipe jacking engineering.The pipe joint outer wall sealing structure comprises a socket steel collar, two stop steel rings and two wedge-shaped sealing rubber rings, the socket steel collar is fixedly arranged on the outer wall of the socket of the front pipe joint, the two stop steel rings and the two wedge-shaped sealing rubber rings are fixedly arranged on the outer wall of the socket of the rear pipe joint in an axial staggered and spaced manner, the inner side of the socket steel collar is provided with water-swelling rubber, and the gap between the socket steel collar and the concrete pipe wall of the front pipe joint is filled with double-component polysulfide sealing paste;the pipe joint inner wall sealing structure comprises two sets of elastic sealing pads, grooves are reserved on the abutting end faces of the inner walls of the front pipe joint and the rear pipe joint, the two sets of elastic sealing pads are fixedly arranged in the grooves of the front pipe joint and the rear pipe joint respectively, and the abutting gap of the inner walls of the front pipe joint and the rear pipe joint is filled with double-component polysulfide sealing paste.The application has the effect of improving the safety of the pipe jacking water conveying tunnel structure.

Description

Technical Field

[0001] This application relates to the field of pipe jacking engineering technology, and in particular to a reinforced concrete pipe jacking interface structure suitable for high water pressure conditions. Background Technology

[0002] With the acceleration of urbanization, trenchless pipe jacking technology has been widely used in underground engineering fields such as municipal engineering and water conservancy. Reinforced concrete pipe jacking has the characteristics of high rigidity, strong load-bearing capacity, good durability and excellent economy. It can effectively withstand external loads from the strata and is increasingly used in water conveyance tunnels crossing rivers and lakes.

[0003] The working conditions of water conveyance tunnels crossing rivers and lakes are complex, subjecting them to high internal and external water pressures and strong ground seepage over long periods. This places stringent requirements on the sealing and waterproofing performance of the pipe joints. Currently, reinforced concrete pipe jacking generally uses steel socket joints with wedge-shaped rubber rings. The rubber rings are flared outwards, and a seal is achieved through the compression deformation of the pipe joints during connection. This effectively resists external water pressure and meets the requirements for external waterproofing.

[0004] The existing interface structure has obvious technical defects and is difficult to adapt to the high internal water pressure operating conditions of water conveyance tunnels. The water pressure test index of conventional reinforced concrete drainage pipes is only 0.1MPa, while the actual operating water pressure in water conveyance tunnels is generally higher than this limit. The internal water pressure sealing performance of the original structure of conventional pipe jacking cannot meet the actual service requirements of the project.

[0005] To address the insufficient resistance to internal water pressure in reinforced concrete pipe jacking, the current mainstream solution is to add a steel lining inside the pipe. While this solution can improve the pipeline's resistance to internal pressure and waterproofing performance, it has significant drawbacks: the cost of the steel lining material is high, significantly increasing project costs; the construction process is cumbersome, requiring high installation precision, and is difficult to construct; the additional lining process prolongs the construction period, resulting in poor overall project efficiency. Furthermore, conventional steel-socketed pipe jacking joints have a low internal water pressure tolerance limit. Under long-term high internal water pressure, the joint sealing structure is prone to seepage, leakage, and even breakdown failure. Joint waterproofing failure not only causes water loss and reduces operational efficiency but also disturbs the surrounding soil, leading to abnormal stress on the pipeline structure, seriously affecting the structural stability and long-term operational safety of the water conveyance tunnel. Summary of the Invention

[0006] In order to overcome the technical problems described in the prior art, this application provides a reinforced concrete pipe jacking interface structure suitable for high water pressure conditions.

[0007] The technical solution provided in this application for a reinforced concrete pipe jacking interface structure suitable for high water pressure conditions is as follows: A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions, located at the interface between adjacent front and rear pipe sections, includes... The outer wall sealing structure of the pipe section includes a socket steel sleeve, two anti-reverse steel rings and two wedge-shaped sealing rubber rings. The socket steel sleeve is fixed to the outer wall of the socket of the front pipe section. The two anti-reverse steel rings and the two wedge-shaped sealing rubber rings are fixed to the outer wall of the spigot of the rear pipe section along the axial direction of the pipe section. The inner side of the socket steel sleeve is provided with water-swellable rubber, and the gap between the socket steel sleeve and the concrete pipe wall of the front pipe section is filled with two-component polysulfide sealant. The inner wall sealing structure of the pipe section includes two sets of elastic sealing gaskets. Grooves are reserved on the mating end faces of the front and rear pipe sections near the inner wall. The two sets of elastic sealing gaskets are fixedly installed in the grooves of the front and rear pipe sections respectively. The gap between the inner walls of the front and rear pipe sections is filled with two-component polysulfide sealant.

[0008] Furthermore, the socket steel collar and the anti-reverse steel collar are both anchored to the steel cage of the front and rear pipe sections respectively by anchor bars, and are integrally cast with the pipe section concrete to form an integrated fixed structure.

[0009] Furthermore, the wedge-shaped sealing rubber ring is bonded and fixed to the rear section of the pipe with an adhesive. The inner side of the wedge-shaped sealing rubber ring is a horizontal structure and the outer side is an inclined structure. The thickness of the whole increases from front to back along the axial direction of the pipe section, and the rear end of the wedge-shaped sealing rubber ring is provided with an arc-shaped lip structure.

[0010] Furthermore, the elastic sealing gasket has several pressure relief holes, and the elastic sealing gasket is bonded and fixed in the groove by an adhesive.

[0011] Furthermore, bolt holes are symmetrically provided at the docking positions of the front and rear sections of the tube, and connecting bolts are installed in the bolt holes. Tightening the connecting bolts can apply pre-tightening pressure to the elastic sealing gasket in the groove.

[0012] Furthermore, the insertion end of the rear section pipe is provided with several grouting pipes, which are installed through the pipe wall of the rear section pipe.

[0013] Furthermore, the end of the grouting pipe is equipped with an external square plug for temporary sealing.

[0014] Furthermore, the connecting bolts and the grouting pipe are arranged in a staggered manner on the cross-section of the pipe section.

[0015] Furthermore, a wooden liner is sandwiched between the mating end faces of the front and rear sections of the tube.

[0016] Furthermore, the two-component polysulfide sealant located at the joint between the inner walls of the front and rear sections of the tube is placed on the inner side of the elastic sealing gasket.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. The pipe jacking interface structure provided by the present invention is reasonable and easy to implement, which can effectively solve the problems of high internal water pressure and high external water pressure faced in water conveyance tunnels and ensure the waterproof performance of water conveyance tunnels throughout their entire operational lifespan. 2. Compared with the existing high internal water pressure solution of constructing a steel pipe lining inside a reinforced concrete pipe in water conveyance tunnels, the pipe jacking interface structure proposed in this invention can effectively save investment and shorten the construction period; 3. The grouting pipe reserved at the end of the rear pipe section can effectively fill the gap between the pipe jacking structure and the excavated soil, reduce ground settlement, and at the same time isolate the hydraulic connection between groundwater and the structure, thus extending the service life of the pipe jacking tunnel. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the structure of the front pipe section, rear pipe section, socket steel collar, anti-reverse steel ring, wedge-shaped sealing rubber ring and grouting pipe in the embodiments of this application.

[0021] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0022] Figure 4 This is a schematic diagram of the wedge-shaped sealing rubber ring in an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the structure of the elastic sealing gasket in the embodiments of this application.

[0024] Reference numerals: 1. Front section pipe; 2. Rear section pipe; 3. Socket steel collar; 4. Anti-reverse steel ring; 5. Wedge-shaped sealing rubber ring; 6. Two-component polysulfide sealant; 7. Elastic sealing gasket; 8. Groove; 9. Pressure relief hole; 10. Bolt hole; 11. Connecting bolt; 12. Grouting pipe; 13. Outer square pipe plug; 14. Wooden liner; 15. Water-swellable rubber; 16. Positioning steel ring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] This application discloses a reinforced concrete pipe jacking interface structure suitable for high water pressure conditions. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions is disclosed, located at the interface between adjacent front pipe section 1 and rear pipe section 2. The front pipe section 1 is equipped with a socket structure, and the rear pipe section 2 is equipped with a spigot structure. This pipe jacking interface structure includes an outer wall sealing structure and an inner wall sealing structure. The outer wall sealing structure is the core first waterproof barrier of this invention against the high groundwater pressure outside the tunnel, and mainly includes a socket steel collar 3, two anti-reverse steel rings 4, and two wedge-shaped sealing rubber rings 5.

[0027] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 During the prefabrication stage of pipe sections, the first step is to bind and form the reinforcing cages for each section. At a predetermined position on the outer wall of the socket of the preceding pipe section 1, anchor bars are used to reliably anchor the socket steel collar 3 to the reinforcing cage, ensuring that the relative position of the socket steel collar 3 and the reinforcing cage is fixed without deviation or loosening. Similarly, at a predetermined position on the outer wall of the spigot of the following pipe section 2, anchor bars are used to reliably anchor two anti-reverse steel rings 4 at intervals to the reinforcing cage, ensuring that the relative position of the anti-reverse steel rings 4 and the reinforcing cage is fixed without deviation or loosening. After the steel components are anchored, the entire formwork is erected and the pipe section concrete is poured, forming an integral cast structure with the socket steel collar 3, anti-reverse steel rings 4, and the pipe section concrete. This significantly improves the bonding strength between the steel rings and the concrete, preventing problems such as steel ring detachment and water seepage channels from occurring later.

[0028] After the concrete of the pipe section has cured to the design strength, the assembly of the outer wall wedge-shaped sealing rubber ring 5 will commence. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5This invention employs an assembly method in which two anti-reverse steel rings 4 and two wedge-shaped sealing rubber rings 5 ​​are arranged axially in a staggered manner. The two anti-reverse steel rings 4 are axially spaced along the outer wall of the rear section pipe 2 insertion port, forming an annular mounting groove between them. One wedge-shaped sealing rubber ring 5 is embedded and fixed in the annular groove between the two anti-reverse steel rings 4, while the other wedge-shaped sealing rubber ring 5 is arranged on the axial rear side of the two anti-reverse steel rings 4, forming a staggered, double-layered progressive outer wall sealing structure. Compared with the traditional single-seal structure, this structure offers higher waterproof redundancy and stronger resistance to high-pressure water head. The two wedge-shaped sealing rubber rings 5 ​​are uniformly bonded and fixed in the preset installation position using 202 neoprene rubber adhesive. The bonding surfaces are ground clean, free of dust and oil, ensuring a firm bond and a gapless seal. The wedge-shaped sealing rubber ring 5 adopts a special irregular structure, with a horizontal straight surface on the inner side and an inclined slope on the outer side. The thickness of the wedge-shaped sealing rubber ring 5 gradually increases from the front end to the rear end along the axial direction of the pipe section, and the rear end of the wedge-shaped sealing rubber ring 5 is equipped with an arc-shaped lip structure. During the pipe jacking and docking process, the spigot of the rear pipe section 2 is gradually pressed into the socket of the front pipe section 1. The wedge-shaped sealing rubber ring 5 is compressed and deformed under the squeezing action of the socket steel sleeve 3. Among them, the arc-shaped lip at the rear end has the largest compression and the highest contact stress, which can tightly fit the inner wall of the socket steel sleeve 3, forming a high-pressure and dense sealing surface on the outer wall of the pipe section. This can effectively resist the high external water pressure outside the tunnel and prevent external water from seeping into the interface.

[0029] To further seal the water leakage channels on the outer wall, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5Water-swellable rubber 15 is embedded inside the socket steel collar 3 of the front section pipe 1. Upon contact with water seepage, the water-swellable rubber 15 automatically expands to seal tiny gaps, achieving passive waterproofing and reinforcement. Simultaneously, all construction gaps and pouring joints between the socket steel collar 3 and the concrete wall of the front section pipe 1 are completely filled with two-component polysulfide sealant 6 to thoroughly seal the minute water seepage channels at the steel-concrete interface. The two-component polysulfide sealant 6 used in this invention is an AB two-component room-temperature vulcanizing elastic sealing material. The standard construction quality ratio is A component:B component = 10:1. The ratio can be finely adjusted according to the ambient temperature; in summer, the B component can be appropriately reduced, and in winter, the B component can be appropriately increased to ensure uniform curing rate. Component A (approximately 90% by mass) is a grayish-white base paste, primarily composed of liquid polysulfide rubber, compounded with activated light calcium carbonate, activated heavy calcium carbonate, fumed silica reinforcing filler, dibutyl phthalate plasticizer, epoxy silane coupling agent, and thixotropic functional additives. Component B (approximately 10% by mass) is a black curing paste, using manganese dioxide as the core vulcanizing agent, combined with semi-reinforcing carbon black auxiliary filler and vulcanization accelerator. When the two components are mixed at room temperature, an oxidative cross-linking reaction occurs, forming a stable three-dimensional network of highly elastic colloid. This colloid can cure normally in the humid environment of tunnels, exhibiting excellent adhesion to the steel-concrete interface and excellent waterproofing properties. It is suitable for sealing conditions under high external water pressure on the outer wall, forming a multi-layered external wall waterproofing system consisting of a wedge-shaped sealing rubber ring as the main seal, an expanded rubber auxiliary seal, and polysulfide paste for caulking.

[0030] Traditional pipe jacking relies solely on the external wall sealing structure. Under the long-term effect of high internal water pressure during tunnel operation, the wedge-shaped sealing rubber ring 5 on the external wall is easily punctured and overturned by the internal water pressure, causing water seepage and gushing into the tunnel wall, which seriously affects structural safety. To address this, the present invention sets up an independent inner wall sealing structure for the pipe section, serving as a core second waterproof barrier against the high internal water pressure.

[0031] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5During the precast concrete pouring stage of the pipe sections, annular grooves 8 are simultaneously reserved on the mating surfaces of the front pipe section 1 and the rear pipe section 2 near the inner wall. The grooves 8 are uniform in size and depth, and the concrete surface of the grooves is flat, dense, and free of honeycomb pits. The inner wall sealing structure of the pipe section includes two sets of elastic sealing gaskets 7, which are fixedly installed in the grooves 8 of the front pipe section 1 and the rear pipe section 2 respectively. The grooves 8 serve as dedicated mounting bases for the elastic sealing gaskets 7, effectively limiting the deformation range of the elastic sealing gaskets 7 and preventing them from slipping or falling off under the action of jacking compression and water pressure. The elastic sealing gaskets 7 are made of EPDM rubber material with aging resistance, high resilience, and high compression performance. Several pressure relief holes 9 are evenly opened on the body of the elastic sealing gaskets 7. The pressure relief holes 9 can significantly improve the compression and resilience performance of the elastic sealing gaskets 7, ensuring stable compression and buffering of mating stress during jacking, and continuously and stably outputting contact stress during operation, adapting to the long-term load of high internal water pressure. Before installation, the inside of the groove 8 is cleaned, dusted, and dried. The elastic sealing gasket 7 is then completely bonded and fixed inside the reserved groove 8 using a special adhesive, ensuring full adhesion, no voids, and no curling edges. During the pipe jacking and docking process, the front and rear pipe sections gradually fit and compress, and the elastic sealing gasket 7 on the inner wall deforms evenly under pressure. Relying on its high resilience, it forms a tightly fitting joint seal, effectively preventing water from leaking out of the tunnel, specifically designed to cope with the high internal water pressure conditions during the operation of water conveyance tunnels.

[0032] After the entire pipe jacking is completed and the pipe sections are joined and formed, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A two-component polysulfide sealant 6 is applied to the joint between the inner walls of the front section 1 and the rear section 2. This two-component polysulfide sealant 6 covers the side of the elastic sealing gasket 7 closest to the interior of the front section 1 and the rear section 2. On the one hand, it can further seal the tiny gaps in the inner wall joint, improving the overall waterproof level; on the other hand, it can prevent water, silt, and impurities inside the tunnel from directly contacting the elastic sealing gasket 7, avoiding long-term erosion, aging, and wear of the elastic sealing gasket 7, and significantly improving the durability and service stability of the inner wall sealing system.

[0033] To address the issue of leakage caused by long-term pressure relaxation, reduced resilience, and decreased sealing stress in conventional rubber gaskets, referencing Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5This invention pre-drills bolt holes 10 at the pipe section interface and configures connecting bolts 11 to achieve full-process pre-tightening and pressure stabilization of the sealing gasket. During the pipe section prefabrication stage, bolt holes 10 are symmetrically pre-drilled at corresponding positions on the mating end faces of the front pipe section 1 and the rear pipe section 2. One end of the bolt hole 10 away from the mating end face is located on the inner wall of the front pipe section 1 / rear pipe section 2. After the tunnel is fully jacked and the pipe sections are aligned, connecting bolts 11 are inserted into each bolt hole 10 and tightened step by step. The locking force of the connecting bolts 11 applies a constant pre-tightening pressure to the elastic sealing gasket 7 inside the groove 8, so that the elastic sealing gasket 7 always maintains a preset compression state throughout the entire operation cycle, continuously and stably outputs sealing contact stress, and completely avoids the sealing failure problem caused by stress relaxation and insufficient deformation rebound of the elastic sealing gasket 7. After all 11 connecting bolts are tensioned and tightened and their sealing performance is inspected and approved, waterproof mortar or micro-expansion fine stone concrete is used to fill, seal, and smooth the bolt holes 10 in layers to ensure that the inner wall of the pipe section is flat and straight. At the same time, structural opening defects are repaired to ensure the overall structural strength and durability of the pipe section.

[0034] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This invention pre-installs multiple grouting pipes 12 at the insertion end of the rear section pipe 2. The grouting pipes 12 penetrate the wall of the rear section pipe 2, and a positioning steel ring 16 is welded and sealed onto each grouting pipe 12. The positioning steel ring 16 is pre-embedded inside the rear section pipe 2, ensuring the stability of the grouting pipe 12 installation and preventing water seepage. Three to four grouting pipes 12 are evenly arranged in each single jacking section according to the tunnel cross-section dimensions. The grouting pipes 12 and connecting bolts 11 are staggered on the cross-section of the pipe section to avoid stress concentration and structural interference caused by concentrated openings, maximizing the preservation of the integrity of the pipe section's concrete structure. During the pipe jacking construction phase, friction-reducing slurry is injected into the gap between the outer wall of the pipe section and the soil through the grouting pipes 12, effectively reducing the frictional resistance of the jacking, decreasing the jacking pressure, and protecting the sealing structure of the pipe section interface from damage by construction loads. After the entire jacking pipe is completed and stabilized, the original lubricating and drag-reducing mud on the outside of the pipe section is completely replaced with waterproof cement grout using grouting pipe 12. This grouting fills and solidifies the voids in the outer wall of the pipe section, forming an overall waterproof and solidified outer layer. This completely eliminates seepage channels in the outer wall, further enhancing the overall waterproof and seepage-resistant capabilities of the tunnel. After the entire grouting process is completed, an outer square pipe plug 13 is installed at the end of the grouting pipe 12 to seal the port. Then, epoxy mortar is used to level and seal the pipe opening, ensuring it is dense, waterproof, smooth, and aesthetically pleasing. This also prevents corrosion and blockage of the grouting pipe 12, improving the long-term durability of the structure.

[0035] To avoid rigid compression, edge chipping, and damage to the concrete end faces of the front section 1 and rear section 2 caused by the enormous jacking force during the pipe jacking process, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In this invention, a wooden pad 14 is installed between the mating end faces of the front section pipe 1 and the rear section pipe 2. The wooden pad 14 is made of plywood material with uniform texture, moderate elasticity, and good integrity, with uniform thickness, no cracks, and no delamination. During the jacking construction, the wooden pad 14 is sandwiched between the concrete end faces on both sides, effectively buffering and dispersing the concentrated jacking force, achieving flexible mating, avoiding damage from hard contact and squeezing of the concrete, protecting the integrity of the pipe section end faces, and at the same time, allowing for fine adjustment of the flatness of the pipe section mating, and assisting in improving the sealing and fitting accuracy of the interface. It should be noted that the wooden pad 14 in this invention is a permanent structure and does not need to be removed after the mating is completed; the wooden pad 14 only undertakes the functions of end face buffering, pressure equalization, and anti-collision, and will not encroach on the compression deformation space of the inner and outer sealing structures, nor will it create a water seepage channel, and will not affect the sealing and fitting effect of the wedge-shaped sealing rubber ring 5, the elastic sealing gasket 7, and the polysulfide sealant. Conversely, the permanently placed wooden gasket 14 can make the gap between pipe sections uniform and the force balanced, avoiding the problems of uneven pressure and voiding of the sealing gasket caused by local misalignment and uneven gaps in the pipe sections, and greatly ensuring and improving the overall sealing stability and long-term waterproof reliability of the interface.

[0036] The implementation principle of a reinforced concrete pipe jacking interface structure applicable to high water pressure conditions in this application embodiment is as follows: This invention adopts a multi-level, all-round waterproof structural system with an outer wall resisting external pressure, an inner wall resisting internal pressure, bolts stabilizing pressure, grouting to plug gaps, and a lining to protect the structure. The outer wall uses two staggered wedge-shaped sealing rubber rings 5 ​​in conjunction with a backstop steel ring 4 to effectively resist high external water pressure; the inner wall uses a high-resilience EPDM elastic sealing gasket 7 in conjunction with a two-component polysulfide sealant 6 to specifically address the problem of leakage due to high internal water pressure during water transport; the bolt pre-tightening technology solves the problem of long-term stress attenuation of the elastic sealing gasket 7; the grouting replacement technology eliminates water seepage channels on the outside of the pipe wall; and the buffer wooden lining 14 solves the problem of structural damage during construction. Compared to the traditional pipe jacking interface structure that relies solely on a single seal on the outer wall, the present invention has a clear division of labor, sufficient waterproof redundancy, simple construction process, and low maintenance requirements. It can stably adapt to the complex working conditions of water conveyance tunnels with high internal and external water pressure for a long time, effectively preventing defects such as interface leakage and structural failure, and significantly improving the structural safety and service durability of pipe jacking water conveyance tunnels.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions, located at the interface between adjacent front and rear pipe sections, characterized in that, include The outer wall sealing structure of the pipe section includes a socket steel sleeve, two anti-reverse steel rings and two wedge-shaped sealing rubber rings. The socket steel sleeve is fixed to the outer wall of the socket of the front pipe section. The two anti-reverse steel rings and the two wedge-shaped sealing rubber rings are fixed to the outer wall of the spigot of the rear pipe section along the axial direction of the pipe section. The inner side of the socket steel sleeve is provided with water-swellable rubber, and the gap between the socket steel sleeve and the concrete pipe wall of the front pipe section is filled with two-component polysulfide sealant. The inner wall sealing structure of the pipe section includes two sets of elastic sealing gaskets. Grooves are reserved on the mating end faces of the front and rear pipe sections near the inner wall. The two sets of elastic sealing gaskets are fixedly installed in the grooves of the front and rear pipe sections respectively. The gap between the inner walls of the front and rear pipe sections is filled with two-component polysulfide sealant.

2. The reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 1, characterized in that, The socket steel collar and the anti-reverse steel collar are both anchored to the steel cage of the front and rear pipe sections respectively by anchor bars, and are integrally cast with the pipe section concrete to form an integrated fixed structure.

3. The reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 1, characterized in that, The wedge-shaped sealing rubber ring is bonded and fixed to the rear section of the pipe with an adhesive. The inner side of the wedge-shaped sealing rubber ring is a horizontal structure and the outer side is an inclined structure. The thickness of the whole ring increases from front to back along the axial direction of the pipe section, and the rear end of the wedge-shaped sealing rubber ring is provided with an arc-shaped lip structure.

4. The reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 1, characterized in that, The elastic sealing gasket has several pressure relief holes, and the elastic sealing gasket is bonded and fixed in the groove by an adhesive.

5. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 4, characterized in that, The front and rear sections of the tube are symmetrically provided with bolt holes at their docking positions. Connecting bolts are inserted into the bolt holes, and tightening the connecting bolts can apply pre-tightening pressure to the elastic sealing gasket in the groove.

6. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 5, characterized in that, Several grouting pipes are pre-installed at the insertion end of the rear section pipe, and the grouting pipes are installed through the pipe wall of the rear section pipe.

7. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 6, characterized in that, The grouting pipe is equipped with an external square plug at its end for temporary sealing.

8. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 7, characterized in that, The connecting bolts and the grouting pipe are arranged in a staggered manner on the cross section of the pipe section.

9. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 1, characterized in that, A wooden pad is sandwiched between the mating end faces of the front and rear sections of the tube.

10. A reinforced concrete pipe jacking interface structure suitable for high water pressure conditions according to claim 1, characterized in that, The two-component polysulfide sealant located at the joint between the inner walls of the front and rear sections of the tube is placed on the inner side of the elastic sealing gasket.

Images