Tunnel grouting ring increasing point grouting construction device and construction structure

Abstract

The application discloses a tunnel grouting ring increasing point grouting construction device and a construction structure. The construction device comprises a grouting pipe piece, one end of the grouting pipe piece is provided with a grouting hole penetrating in and out, the outer side of the grouting pipe piece is provided with a grouting groove, a bending pipe joint is communicated between the grouting hole and the grouting groove, the bending pipe joint is communicated with a guide pipe in the grouting groove, and both ends of the guide pipe are located at both ends of the grouting pipe piece. The construction structure comprises a tunnel and the above-mentioned tunnel grouting ring increasing point grouting construction device, and the grouting pipe piece is supported in the tunnel. The application has the beneficial effects that the purpose of grouting range diffusion is realized from a single grouting hole through supplementary grouting by pre-embedded grouting pipes; the pre-embedded guide pipe can directly deliver grout to areas where the grout is difficult to diffuse, greatly increases the guarantee rate of forming a complete and continuous grouting ring, and reduces engineering risks and quality hidden dangers caused by incomplete grouting rings.

Description

Technical Field

[0001] This application belongs to the field of tunnel construction technology, specifically relating to a tunnel grout stop ring additional grouting construction device and construction structure, used in the construction behind tunnel segment walls to form a grouting measure for forming a continuous closed grout stop ring. Background Technology

[0002] During tunnel construction, after the segment lining is assembled, a ring-shaped gap is formed between its outer wall and the excavated rock wall. To stabilize the segment lining structure and ensure it shares the load with the surrounding rock, gravel must be promptly blown into this gap, followed by cement grouting to form a dense gravel-cement aggregate. This is crucial for controlling ground deformation, ensuring segment stability, and providing long-term waterproofing of the tunnel, especially in complex conditions such as long downhill slopes, tunnels passing under important buildings or water-rich strata.

[0003] However, a particularly prominent technical challenge in such tunnel engineering is preventing grout leakage during subsequent secondary grouting, i.e., the significant loss of grout along the tail gap towards the tunnel boring machine. This not only wastes grouting materials and results in insufficient filling behind the lining, but also prevents the effective establishment of grouting pressure, severely impacting the grouting reinforcement effect and waterproofing reliability. To address this issue, the current conventional process involves applying rapid-setting dual-liquid grout (cement-water glass) stop rings at intervals (e.g., 50 rings on straight sections and 30 rings on downhill sections). These stop rings aim to form a rapidly solidifying, closed barrier around the tunnel, preventing subsequent grout leakage. However, this process has inherent defects in practical applications, which limit its reliability—the integrity and continuity of the grout-stop ring itself are difficult to guarantee: due to the limited number of grouting holes reserved in each ring segment, the circumferential flow and diffusion range of the two-liquid grout injected from a single grouting hole in the gravel voids is severely restricted; the grout tends to accumulate and solidify rapidly in the area near the grouting hole, often making it difficult to effectively penetrate and connect to the distal area between two adjacent grouting holes. This easily leads to local weaknesses or interruptions in the circumferential direction of the final grout-stop ring, making it impossible to form a continuous and complete sealing ring.

[0004] The consequences of such defective grout-stopping rings are particularly severe in long downhill sections. The slope and gravity exacerbate the forward loss of grout, not only failing to effectively stop the grout flow and leading to material waste and incomplete filling, but also failing to effectively reduce drainage pressure during tunnel operation. Therefore, ensuring that the grout injected from a limited number of grouting holes can form a continuous, complete, and reliable circumferential seal, without increasing the number of grouting holes in the tunnel segments and avoiding increased manufacturing costs and assembly complexity, has become a critical technical challenge that urgently needs to be addressed to improve tunnel construction quality, especially when dealing with complex hydrogeological conditions. Utility Model Content

[0005] The purpose of this application is to address the problems of weak control over the flow direction of dual-component grout and uneven grout diffusion in existing grouting processes. This application provides a tunnel grout stop ring additional grouting construction device and construction structure. By pre-embedding a conduit, supplementary grouting is performed in advance in the area far from the grouting hole. By first supplementing grouting at the far end, and then directly performing conventional grout stop ring construction from the grouting hole, the integrity and sealing reliability of the grout stop ring are ensured, effectively avoiding grout loss during the backfill grouting process, and improving the grouting effect and project quality.

[0006] The objective of this application is achieved through the following technical solution: A tunnel grouting ring grouting construction device includes a grouting segment. One end of the grouting segment is provided with an internally and externally penetrating grouting hole. The outer side of the grouting segment is provided with a grouting groove. A bent pipe joint connects the grouting hole and the grouting groove. The bent pipe joint is connected to a guide pipe in the grouting groove. The two ends of the guide pipe are located at the two ends of the grouting segment.

[0007] Furthermore, the grouting hole is connected to the grouting trench.

[0008] Furthermore, the grouting holes are arranged radially.

[0009] Furthermore, a sealing cap is provided at the inner opening of the grouting hole.

[0010] Furthermore, the bent pipe joint has an L-shaped structure.

[0011] Furthermore, the grouting groove is an arc-shaped groove.

[0012] Furthermore, the conduit includes an inner supporting steel wire and an outer composite layer, the composite layer including a non-woven filter cloth and a nylon mesh.

[0013] Furthermore, the outer side of the grouting pipe segment is provided with a protective cover plate, which covers the grouting hole and grouting groove.

[0014] Furthermore, the protective cover is a plastic grid, and the protective cover is fixed to the grouting pipe segment by bolts.

[0015] Furthermore, a temporary sealing sleeve is provided at the opening of the catheter.

[0016] A tunnel grout-stopping ring-increasing grouting construction structure includes a tunnel and the aforementioned tunnel grout-stopping ring-increasing grouting construction device, with grouting segments supported inside the tunnel.

[0017] Furthermore, it also includes retaining pipe segments, grouting pipe segments, and retaining pipe segments arranged in sequence at intervals, with the grouting pipe segments and retaining pipe segments together forming a pipe segment support structure.

[0018] The beneficial effects of this application are as follows: supplementary grouting through pre-embedded grouting pipes achieves the purpose of grouting range diffusion from a single grouting hole; pre-embedded conduits can directly transport grout to areas where it is difficult to diffuse, greatly increasing the guarantee rate of forming a complete and continuous grout stop ring and reducing engineering risks and quality hazards caused by incomplete grout stop rings; at the same time, the construction process of pre-embedded conduits does not require any changes to the existing tunnel boring machine and segment assembly process, and the optimization is mainly carried out in the segment design and manufacturing stage.

[0019] The aforementioned main solution and its various further alternatives can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding this solution, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the construction device structure for this application.

[0021] Figure 2 This is a partial structural diagram of the outer side of the construction device of this application.

[0022] Figure 3 This is a schematic diagram of the construction structure of this application.

[0023] In the diagram: 100-grouting segment, 200-enclosure segment; 101-grouting hole, 102-sealing hole cover, 103-bent pipe joint, 104-grouting trench, 105-conduit pipe, 106-protective cover plate, 107-bolt, 108-temporary cover. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0025] Example 1 refer to Figure 1 and Figure 2 As shown, a tunnel grout stop ring additional grouting construction device includes a grouting pipe segment 100. This construction device addresses the problem of grout stop ring construction during the backfill grouting process. It supplements grouting through a pre-embedded conduit to solve the problems of uneven diffusion of the two-liquid grout and incomplete grout stop ring formation, thus preventing grout leakage during backfill grouting.

[0026] The grouting segment 100 is a precast reinforced concrete structure that serves as a normal enclosure support. Simultaneously, the grouting segment 100 undergoes structural optimization to ensure uniform grouting behind the wall. One end of the grouting segment 100 is provided with a grouting hole 101 that connects internally and externally, allowing grouting operations to be performed from the inside of the segment to the outside.

[0027] The outer surface of the grouting segment 100 is provided with a grouting groove 104, which is used for the arrangement of the guide pipe 105. The grouting hole 101 is connected to the grouting groove 104, which facilitates the processing and shaping of the structure. Both the grouting hole 101 and the grouting groove 104 are pre-embedded during the segment prefabrication process.

[0028] A bent pipe joint 103 connects the grouting hole 101 and the grouting trench 104, serving as a transition point to redirect the grout. The bent pipe joint 103 connects to a conduit 105 within the grouting trench 104, with both ends of the conduit 105 located at opposite ends of the grouting segment 100. This allows grouting operations to be performed at a distant end via the conduit 105. After completion, the bent pipe joint 103 can be destroyed to allow grouting operations at a closer end, ensuring the grouting range covers both near and far areas and thus guaranteeing grout uniformity. The bent pipe joint 103 and the conduit 105 are installed and fixed during the segment prefabrication process.

[0029] The grouting holes 101 are arranged radially to ensure rapid connection between the inside and outside. A sealing cover 102 is provided at the inner opening of the grouting hole 101 to seal the grouting hole 101, so as to ensure the unobstructed flow of the grouting hole 101 before grouting and to prevent debris from falling into the hole and causing blockage.

[0030] The bent pipe joint 103 has an L-shaped structure. One end of it extends into the grouting hole 101 to achieve communication, so that the grout can enter the pipe joint from the grouting hole 101. The other end of the bent pipe joint 103 is threaded, and the thread is used to connect and communicate with the conduit 105. After the grout is turned by the bent pipe joint 103, it extends through the conduit 105.

[0031] Grouting groove 104 is an arc-shaped groove with dimensions of 1500*20*20mm. During segment production, it is pre-set along the cross-sectional direction of the segment at the grouting holes on the outer wall of the segment. Conduit 105 is a disposable grouting pipe with an inner diameter of 8mm and an outer diameter of 12mm. The conduit is fixed to the segment with epoxy resin structural adhesive and placed in the arc-shaped groove, extending to one side along the outer wall of the segment to the target area, that is, the gap at the outer shield tail of the segment corresponding to the circumferential midpoint between two adjacent grouting holes.

[0032] The guide tube 105 includes an inner supporting steel wire and an outer composite layer. The composite layer includes a non-woven filter cloth and a nylon mesh. That is, the guide tube 105 uses a steel spring as a supporting skeleton to ensure that the grouting channel is continuously unobstructed. The outer layer is a double filtration layer of composite non-woven filter cloth and nylon mesh, which is flexible and can also ensure the encapsulation and delivery of grout. The guide tube can be laid along the groove on the outer wall of the pipe segment.

[0033] The outer surface of the grouting segment 100 is provided with a flexible protective cover plate 106. The protective cover plate 106 covers the grouting hole 101 and the grouting groove 104. The width of the cover plate completely covers the guide pipe and the grouting hole to protect and shield the hole and groove, preventing debris from entering and damaging the pipeline. The protective cover plate 106 is a plastic grid, preferably made of glass fiber reinforced plastic. The protective cover plate 106 is fixed to the grouting segment 100 with bolts. Bolts are used on both sides of the cover plate to anchor it to the concrete of the segment. The protective cover plate 106 is provided with expansion metal bolts on both sides, with four bolts in a single row, to anchor the flexible cover plate to the outer wall of the segment.

[0034] A temporary sleeve 108 is provided at the opening of the conduit 105. The sleeve is preferably made of rubber and is used to seal and protect the port. The rubber sleeve is wrapped around the port of the pre-embedded conduit for temporary sealing to prevent damage that may occur during the filling of gravel.

[0035] Example 2 refer to Figures 1-3 As shown, a tunnel grout-stopping ring-addition point grouting construction structure includes a tunnel and the tunnel grout-stopping ring-addition point grouting construction device of Example 1.

[0036] Grouting segments 100 are installed inside the tunnel. They serve both as normal retaining walls and for grouting operations behind the tunnel walls. The grouting range of the grouting segments 100 can cover both near and far distances, ensuring uniform grouting. Grouting is injected behind the segments to form a continuous, closed grout-stopping ring during the construction process behind the segments.

[0037] The system also includes retaining segments 200, grouting segments 100, and retaining segments 200 arranged alternately, forming a segment support structure together. Grouting segments 100 can perform grouting operations at both ends (near and far ends), so adjacent segments do not require structural modifications and can use conventional segments. The spaced arrangement of grouting segments 100 also ensures the uniformity of grouting.

[0038] The workflow of this application is as follows: (1) Prefabrication of grouting segments; (2) Installation of grouting segments; (3) After the segments are installed and the gravel filling process is completed, check the guide pipe opening to ensure that it is not blocked; (4) Connect the grouting equipment and carry out the first step of supplementary grouting through the guide pipe. Control the end time of supplementary grouting by monitoring the grouting pressure and observing the leakage of the hole; (5) Suspend grouting and perform pipe breaking operation at the grouting hole to destroy the two-way pipe joint structure and establish a new channel directly from the grouting hole to the nearby shield tail gap. Carry out the second step of grouting. Control the end time of the second step of grouting by monitoring the grouting pressure and observing the leakage of the hole; (6) Repeat (3) to (5) in the order of the segments from bottom to top until the grouting ring construction work of all the preset grouting holes of the single ring is completed.

[0039] The foregoing basic examples and their further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the scheme of this application, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tunnel grout-stopping ring-addition grouting construction device, comprising grouting segments (100), characterized in that: One end of the grouting pipe segment (100) is provided with a grouting hole (101) that runs through the inside and outside. The outer side of the grouting pipe segment (100) is provided with a grouting groove (104). A bent pipe joint (103) is connected between the grouting hole (101) and the grouting groove (104). The bent pipe joint (103) is connected to the conduit (105) in the grouting groove (104). The two ends of the conduit (105) are located at the two ends of the grouting pipe segment (100).

2. The tunnel grout-stopping ring-addition grouting construction device according to claim 1, characterized in that: The grouting hole (101) is connected to the grouting groove (104).

3. The tunnel grout-stopping ring-addition grouting construction device according to claim 1, characterized in that: The grouting hole (101) is provided with a sealing cap (102) at the inner opening.

4. The tunnel grout-stopping ring-addition grouting construction device according to claim 1, characterized in that: The bent pipe joint (103) is an L-shaped structure.

5. The tunnel grout-stopping ring-addition grouting construction device according to claim 1 or 2, characterized in that: The grouting groove (104) is an arc-shaped groove.

6. The tunnel grout-stopping ring grouting construction device according to claim 1, characterized in that: The catheter (105) includes an inner supporting steel wire and an outer composite layer, the composite layer including non-woven filter cloth and nylon mesh.

7. The tunnel grout-stopping ring-addition grouting construction device according to claim 1, characterized in that: The outer side of the grouting pipe segment (100) is provided with a protective cover plate (106), which covers the grouting hole (101) and the grouting groove (104).

8. The tunnel grout-stopping ring-addition grouting construction device according to claim 1 or 7, characterized in that: The catheter (105) is provided with a temporary cap (108) at the opening.

9. A tunnel grout-stopping ring-addition grouting construction structure, comprising a tunnel, characterized in that: It also includes the tunnel grouting ring grouting construction device according to any one of claims 1 to 8, wherein the grouting pipe segment (100) is supported in the tunnel.

10. The tunnel grout-stopping ring grouting construction structure according to claim 9, characterized in that: It also includes retaining pipe segments (200), grouting pipe segments (100) and retaining pipe segments (200) arranged in sequence at intervals, and the grouting pipe segments (100) and retaining pipe segments (200) together form a pipe segment support structure.

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