A synchronous grouting assembly for a tunneling structure

Abstract

The utility model provides a kind of synchronous grouting assembly of excavation structure, comprising: grouting assembly, the grouting assembly is extended to the inside of two lining by being fixed on formwork, its end and waterproof board on the initial support of two lining outside abut, the grouting assembly includes grouting pipe, the grouting pipe is embedded to the inside of two lining, its one end close to formwork and fixed flange sealing abut, the fixed flange is fixedly connected with the one side of formwork away from two lining by bolt, compared with prior art, the utility model has the beneficial effects as follows: by setting grouting assembly, when formwork is dismantled, grouting pipe part that extends outside the skin of two lining structure can be cut according to requirement, and grouting pipe is blocked by prepared blocking head, so as to realize repeatable grouting operation by opening blocking head when needed in later period, solve the problem that the damage waterproof layer or repeated grouting increases material consumption and construction period caused by improving grouting pressure or repeated grouting to enhance filling compactness.

Description

Technical Field

[0001] This utility model belongs to the field of grouting technology for underground excavation structures, and specifically relates to a synchronous grouting component for underground excavation structures. Background Technology

[0002] Currently, the main method for addressing the issue of poor adhesion between the secondary lining and the waterproofing layer in cut-and-cover structures is backfilling and grouting. Traditional grouting systems consist of a grouting base and grouting conduits. The grouting base needs to be heat-fused to the waterproofing layer, and the opening end of the grouting conduit is sealed with a cap and tightly wrapped with sealing tape before being embedded in the concrete. After the formwork is removed, the surface tape and concrete must be manually removed to expose the conduit. This process is complex and requires a high level of technical skill from the construction workers. If the welding is not strong or the sealing is not tight, it can easily lead to blockage or leakage of the grouting channel, affecting the grouting effect. Furthermore, grouting is usually carried out after demolding and when the concrete strength reaches 100% of the design value. At this time, the newly injected grout is difficult to form an effective bond with the hardened concrete, resulting in a weak interface, poor structural integrity, and a "two-layer" appearance.

[0003] To address this issue, conventional methods involve increasing grouting pressure or repeating grouting multiple times to enhance filling density. However, high pressure can damage the waterproofing layer, and repeated grouting increases material consumption and construction time. Furthermore, the delayed grouting process often necessitates the re-erection of scaffolding or work platforms, significantly increasing construction difficulty and costs, especially in space-constrained underground projects. Therefore, we aim to design a novel synchronous grouting assembly for underground excavation to solve this problem. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a synchronous grouting component for underground excavation structures, so as to solve the problems mentioned in the background technology.

[0005] This utility model is achieved through the following technical solution: a synchronous grouting assembly for a tunnel structure, comprising: a grouting assembly, which is fixed to a template and extends into the secondary lining, with its end abutting against a waterproofing plate set on the primary support on the outer side of the secondary lining; the grouting assembly includes a grouting pipe, which is embedded into the secondary lining, with its end near the template sealing against a fixed flange; the fixed flange is fixedly connected to the side of the template away from the secondary lining by bolts; and a connector is sealed at the end of the fixed flange away from the grouting pipe for connection with external grouting equipment. In actual use, longitudinal and circumferential construction joints are formed during template installation. The longitudinal and circumferential spacing of the template openings is set to 4m to 6m. Template openings are set on both sides of the circumferential construction joint and on both sides above and below the longitudinal construction joint, 500mm away from the joint. The reinforcement of the secondary lining can be constructed using existing technology.

[0006] In a preferred embodiment, the grouting pipe includes a pipe body for grouting. An elastic suction cup is fitted on the side of the pipe body near the waterproof membrane and abuts against the waterproof membrane. A snap-fit ​​cavity is provided inside the end of the pipe body near the fixed flange. In actual use, an annular water-stop flange is fixed to the outside of the middle of the pipe body to ensure the waterproofing requirements between the grouting pipe and the surrounding concrete (secondary lining).

[0007] In a preferred embodiment, the pipe body is provided with a conveying channel. The end of the conveying channel near the fixed flange is connected to the snap-fit ​​cavity, and the inner diameter of the snap-fit ​​cavity is larger than the inner diameter of the conveying channel. In actual use, the lower end of the pipe body is also equipped with a sealing head for sealing the lower end of the pipe body after the template and fixed flange are removed. The diameter and height of the upper part of the sealing head are matched with the inner diameter and depth of the snap-fit ​​cavity, respectively. The top of the sealing head is provided with a magnetic ring for magnetic fixation with the metal ring inside the snap-fit ​​cavity. The lower end of the sealing head is provided with a pull ring for easy installation or removal by the operator.

[0008] In a preferred embodiment, a circular boss is provided at the connection between the snap-fit ​​cavity and the conveying channel. A metal ring is fixed to one side of the snap-fit ​​cavity on the circular boss. The inner diameter of the metal ring is the same as the inner diameter of the conveying channel, and the outer diameter of the metal ring is the same as the inner diameter of the snap-fit ​​cavity.

[0009] In a preferred embodiment, the fixed flange includes a flange body, an embedded post is provided in the middle of the flange body near the grouting pipe, a plug-in post is provided in the middle of the embedded post, and a snap-fit ​​groove with an annular cross-section is provided between the plug-in post and the embedded post.

[0010] In a preferred embodiment, a conveying hole is formed through the middle of the outer end of the fixed flange, and the conveying hole passes through the insertion post. The inner diameter of the insertion post matches the inner diameter of the conveying channel, and the outer diameter of the insertion post matches the inner diameter of the snap-fit ​​cavity.

[0011] In a preferred embodiment, the outer end of the fixed flange is recessed inward to form an annular groove, and the axis of the annular groove is collinear with the axis of the conveying hole.

[0012] In a preferred embodiment, a sealing ring is embedded and fixed on the side of the connector near the fixed flange. The sealing ring is movably fitted inside the annular groove on the side near the fixed flange. A through hole is provided in the middle of the connector, which communicates with the conveying hole, and the inner diameters of the two are the same.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are as follows: 1. By setting up the grouting component, after the secondary lining has initially set, grout is injected into the grouting pipe through the through holes and conveying holes inside the connector and the fixed flange. During the grouting process, attention should be paid to controlling the grouting pressure. After the secondary lining reaches the design strength, the compactness of the secondary lining is scanned by ground radar. If there are voids or non-compact areas, the grouting pipe near the void can be used to grout again according to the above grouting steps and requirements until the secondary lining is compact. Then the template can be disassembled. If necessary, the fixed flange can also be disassembled from the template. The connector and the fixed flange do not need to be disassembled for convenient subsequent use.

[0014] 2. The installation of grouting pipes: When removing the formwork, the portion of the grouting pipe extending beyond the inner skin of the secondary lining structure can be cut off as needed, and the grouting pipe can be sealed with a pre-prepared sealing head. This allows for repeated grouting operations when needed, solving the problems of increasing grouting pressure or repeated grouting to enhance filling density, which could damage the waterproof layer or increase material consumption and construction period due to repeated grouting. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a synchronous grouting component for a tunnel excavation structure according to the present invention.

[0017] Figure 2 This is a schematic diagram of the grouting component structure of a synchronous grouting component for a tunnel excavation structure according to the present invention.

[0018] Figure 3 This is a schematic diagram of the grouting pipe structure of a synchronous grouting assembly for a tunnel excavation structure according to the present invention.

[0019] Figure 4 This is a schematic diagram of the fixed flange structure of a synchronous grouting assembly for a tunnel excavation structure according to the present invention.

[0020] Figure 5 This is a schematic diagram of the connector structure of a synchronous grouting component for a tunnel excavation structure according to this utility model.

[0021] Figure 6 This is a schematic diagram of the sealing head structure of a synchronous grouting assembly for a tunneling structure according to this utility model.

[0022] In the diagram, 100 represents the secondary lining, 110 the waterproof membrane, and 120 the formwork.

[0023] 200-Grouting component, 210-Grouting pipe, 211-Elastic suction cup, 212-Pipe body, 213-Metal ring, 214-Snap-fit ​​cavity, 220-Fixed flange, 221-Flange body, 222-Embedded column, 223-Plug-in column, 224-Snap-fit ​​groove, 225-Annular groove, 226-Conveying hole, 230-Connector, 231-Sealing ring, 240-Plug head. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] As the first embodiment of this utility model:

[0026] Please see Figures 1 to 6 A synchronous grouting assembly for a tunnel excavation structure includes: a grouting assembly 200, which is fixed to a template 120 and extends into the secondary lining 100, with its end abutting against a waterproofing membrane 110 disposed on the primary support on the outer side of the secondary lining 100; the grouting assembly 200 includes a grouting pipe 210, which is embedded into the secondary lining 100, with its end near the template 120 sealingly abutting against a fixing flange 220; the fixing flange 220 is bolted to the template 120 away from the secondary lining 100. One side is fixedly connected, and the end of the fixed flange 220 away from the grouting pipe 210 is sealed with a connector 230 for connection with external grouting equipment. In actual use, when the template 120 is installed, longitudinal construction joints and circumferential construction joints are formed. The longitudinal and circumferential spacing of the openings of the template 120 are set to 4m to 6m. The template 120 openings are set on both sides of the circumferential construction joint and on both sides above and below the longitudinal construction joint, 500mm away from the joint. The reinforcement of the secondary lining 100 can be constructed using existing technology.

[0027] The grouting pipe 210 includes a pipe body 212 for grouting. An elastic suction cup 211 is fitted on the side of the pipe body 212 near the waterproof membrane 110 and abuts against the waterproof membrane 110. A snap-fit ​​cavity 214 is provided inside the end of the pipe body 212 near the fixed flange 220. In actual use, an annular water-stop flange is fixed to the outside of the middle of the pipe body 212 to ensure the waterproofing requirements between the grouting pipe 210 and the surrounding concrete (secondary lining 100).

[0028] Specifically, by setting up the grouting component 200, in actual use, the external template 120 is used to pour the secondary lining 100. During the pouring process, care should be taken to avoid the vibrator touching the grouting component 200. After the secondary lining 100 has initially set, grout is injected into the grouting pipe 210 through the through holes and conveying holes 226 inside the connector 230 and the fixed flange 220. During the grouting process, the grouting pressure should be carefully controlled. After the secondary lining 100 reaches the design strength, the compactness of the secondary lining 100 is scanned using ground-penetrating radar. If there are voids or areas that are not compact, the grouting pipe 210 near the void can be used to grout again according to the above grouting steps and requirements until the secondary lining 100 is compacted. Then the template 120 can be disassembled. If necessary, the fixed flange 220 can also be removed from the template 120. The connector 230 and the fixed flange 220 do not need to be disassembled for convenient subsequent use.

[0029] As a second embodiment of this utility model:

[0030] Please see Figures 1 to 6 The pipe body 212 has a conveying channel inside. The end of the conveying channel near the fixed flange 220 is connected to the snap-fit ​​cavity 214. The inner diameter of the snap-fit ​​cavity 214 is larger than the inner diameter of the conveying channel. In actual use, the lower end of the pipe body 212 is also equipped with a sealing head 240 for sealing the lower end of the pipe body 212 after the template 120 and the fixed flange 220 are removed. The diameter and height of the upper side of the sealing head 240 are matched with the inner diameter and depth of the snap-fit ​​cavity 214, respectively. The top of the sealing head 240 is equipped with a magnetic ring for magnetic fixation with the metal ring 213 inside the snap-fit ​​cavity 214. The lower end of the sealing head 240 is equipped with a pull ring for easy installation or removal by the operator.

[0031] A circular boss is provided at the connection between the snap-fit ​​cavity 214 and the conveying channel. A metal ring 213 is fixed on one side of the snap-fit ​​cavity 214. The inner diameter of the metal ring 213 is the same as the inner diameter of the conveying channel, and the outer diameter of the metal ring 213 is the same as the inner diameter of the snap-fit ​​cavity 214.

[0032] The fixed flange 220 includes a flange body 221. An embedded post 222 is provided in the middle of the flange body 221 near the grouting pipe 210. A plug-in post 223 is provided in the middle of the embedded post 222. A snap-fit ​​groove 224 with an annular cross-section is provided between the plug-in post 223 and the embedded post 222.

[0033] A conveying hole 226 is formed by extending inward from the middle of the outer end of the fixed flange 220. The conveying hole 226 passes through the plug-in post 223, and its inner diameter matches the inner diameter of the conveying channel. The outer diameter of the plug-in post 223 matches the inner diameter of the snap-fit ​​cavity 214.

[0034] The outer end of the fixed flange 220 is recessed inward to form an annular groove 225, and the axis of the annular groove 225 is collinear with the axis of the conveying hole 226.

[0035] A sealing ring 231 is embedded and fixed on the side of the connector 230 near the fixed flange 220. The sealing ring 231 is movably clamped inside the annular groove 225 on the side near the fixed flange 220. A through hole is provided in the middle of the connector 230, which communicates with the conveying hole 226 and the two have the same inner diameter.

[0036] Based on the first embodiment described above, further, regarding the setting of the grouting pipe 210, in actual use, after the secondary lining 100 reaches the design strength, the density of the secondary lining 100 is scanned by ground-penetrating radar and found to be qualified. When the formwork 120 is removed, the portion of the grouting pipe 210 extending beyond the inner skin of the secondary lining 100 structure can be cut off as needed, and the grouting pipe 210 can be sealed by the prepared sealing head 240. This allows for repeated grouting operations when needed by opening the sealing head 240, solving the problems of increasing grouting pressure or repeated grouting to enhance filling density, which can damage the waterproof layer or increase material consumption and construction period due to repeated grouting.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A subsurface structure simultaneous grouting assembly, comprising: The grouting assembly (200) is characterized in that it is fixed on the template (120) and extends into the interior of the secondary lining (100), with its end abutting against a waterproofing plate (110) set on the primary support on the outside of the secondary lining (100). The grouting assembly (200) includes a grouting pipe (210) embedded in the interior of the secondary lining (100). One end of the grouting pipe (210) near the template (120) is sealed against a fixing flange (220). The fixing flange (220) is fixedly connected to the side of the template (120) away from the secondary lining (100) by bolts. A connector (230) is sealed and installed at the end of the fixing flange (220) away from the grouting pipe (210) for connection with external grouting equipment.

2. A subsurface excavation structure simultaneous grouting assembly as claimed in claim 1, wherein: The grouting pipe (210) includes a pipe body (212) for grouting. An elastic suction cup (211) is fitted on the side of the pipe body (212) near the waterproof membrane (110) and abuts against the waterproof membrane (110). A snap-fit ​​cavity (214) is provided inside the end of the pipe body (212) near the fixed flange (220).

3. The synchronous grouting assembly for a cut-and-cover structure as described in claim 2, characterized in that: The pipe body (212) is provided with a conveying channel inside. One end of the conveying channel near the fixed flange (220) is connected to the snap-fit ​​cavity (214), and the inner diameter of the snap-fit ​​cavity (214) is larger than the inner diameter of the conveying channel.

4. A subsurface excavation simultaneous grouting assembly as claimed in claim 3, wherein: A circular boss is provided at the connection between the snap-fit ​​cavity (214) and the conveying channel. A metal ring (213) is fixed on one side of the snap-fit ​​cavity (214). The inner diameter of the metal ring (213) is the same as the inner diameter of the conveying channel, and the outer diameter of the metal ring (213) is the same as the inner diameter of the snap-fit ​​cavity (214).

5. A subsurface excavation simultaneous grouting assembly as claimed in claim 4, wherein: The fixed flange (220) includes a flange body (221), and an embedded post (222) is provided in the middle of the flange body (221) near the grouting pipe (210). A plug-in post (223) is provided in the middle of the embedded post (222), and a snap-fit ​​groove (224) with an annular cross-section is provided between the plug-in post (223) and the embedded post (222).

6. The synchronous grouting assembly for a cut-and-cover structure as described in claim 5, characterized in that: The fixed flange (220) has a conveying hole (226) that extends inward from the middle of its outer end. The conveying hole (226) passes through the plug-in post (223), and its inner diameter matches the inner diameter of the conveying channel. The outer diameter of the plug-in post (223) matches the inner diameter of the snap-fit ​​cavity (214).

7. A subsurface excavation structure simultaneous grouting assembly as defined in claim 1, wherein: The outer end of the fixed flange (220) is recessed inward to form an annular groove (225), and the axis of the annular groove (225) is collinear with the axis of the conveying hole (226).

8. A subsurface excavation simultaneous grouting assembly as claimed in claim 7, wherein: A sealing ring (231) is embedded and fixed on the side of the connector (230) near the fixed flange (220). The sealing ring (231) is movably clamped inside the annular groove (225) on the side of the connector (230) near the fixed flange (220). A through hole is provided in the middle of the connector (230), which communicates with the conveying hole (226) and the two have the same inner diameter.

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