A sealing and waterproof sleeve for the middle connection of shield tunnel segment bolts

Abstract

This application discloses a sealing and waterproof sleeve for the middle connection of bolts in shield tunnel segments. It is used to fit onto the bolts assembled on the segments to improve the waterproof capability of the bolt holes used for installing the bolts. The waterproof sleeve includes a water-stop sleeve, a fixing bolt, an outer elastic sealing gasket, and an inner elastic sealing gasket. The bolt hole has an assembly groove, and the water-stop sleeve is installed in the assembly groove by the fixing bolt. The outer elastic sealing gasket is disposed in the assembly groove. The water-stop sleeve includes an outer sleeve with one end abutting against the outer elastic sealing gasket and an inner sleeve screwed into the outer sleeve. The inner sleeve is fitted onto the segment bolt and threadedly fixed. The inner elastic sealing gasket is fitted onto the segment bolt and sandwiched between the inner sleeve and the outer sleeve. The beneficial effects of this application are as follows: This application installs a water-stop sleeve at the middle of the bolt, adding an extra layer of sealing and waterproofing system, greatly improving the waterproof capability at the bolt hole.

Description

Technical Field

[0001] This application relates to the field of waterproofing technology for shield tunnel segment joints, specifically to a sealing and waterproofing sleeve for the middle connection of shield tunnel segment bolts. Background Technology

[0002] With the rapid development of urban subways in my country, the shield tunneling method, as an advanced construction technology, has advantages such as high construction quality, fast construction speed, and minimal environmental impact, and is widely used in underground tunnel engineering. Shield tunnels are constructed by bolting together reinforced concrete segments, resulting in numerous joints and bolt holes. These locations often become major sources of leakage in subway tunnels. Water leakage not only damages the tunnel structure but also harms equipment and facilities within the subway tunnel, thus affecting its normal operation.

[0003] For high-water-pressure shield tunnels, the segment joints require high waterproofing capabilities, typically achieved through a double-layer waterproofing gasket arrangement. This method uses two elastic gaskets at the segment joints; even if the outer gasket fails, the inner gasket can still withstand high water pressure, ensuring the tunnel's waterproofing performance, significantly reducing leakage, and guaranteeing tunnel safety. However, gaps exist in the connecting bolts at the segment joints. When the outer gasket fails, water can easily seep through the central bolt holes, causing the entire waterproofing system at the joint to fail, rendering the inner gasket ineffective. Currently, most designs for waterproofing bolt holes use sealing rings at the bolt manholes. However, during segment bolt assembly, these sealing rings are prone to detaching from the corner grooves and breaking, significantly reducing the waterproofing capability of the bolt holes. In addition, some scholars have proposed adding a waterproofing measure at the middle of the bolt connection. While these measures enhance the waterproofing of the bolt holes to some extent, they rely on the pressure generated during the assembly of the pipe segments to deform the sealing gasket and provide water pressure resistance to the middle of the bolt hole. However, the waterproofing effect is poor when the pipe segments separate or misalign. Actual engineering surveys show that bolt hole leakage still occurs frequently, indicating that the existing treatment methods urgently need improvement and a more scientific and rational design is required.

[0004] The waterproofing design of the bolt holes in the middle of the segment joints in shield tunnels is crucial for achieving the dual-layer waterproofing effect. Therefore, a reasonable design for the waterproofing of the bolt holes in the middle is necessary to improve waterproofing capacity and system reliability. Summary of the Invention

[0005] The purpose of this application is to provide a sealing and waterproof sleeve at the middle connection of the bolts of the shield tunnel segments. By installing a water-stop sleeve at the middle of the bolt, an additional sealing and waterproof system is added, which greatly improves the waterproofing capability at the bolt hole, thereby solving at least one of the technical problems involved in the background art.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] This application provides a sealing and waterproof sleeve for the middle connection of shield tunnel segment bolts. It is used to fit onto the segment bolts assembled on the segments to improve the waterproof capability of the bolt holes used to install the segment bolts. The waterproof sleeve includes a water-stop sleeve, a fixing bolt, an outer elastic sealing gasket, and an inner elastic sealing gasket. The bolt hole has an assembly groove, and the water-stop sleeve is installed in the assembly groove by the fixing bolt. The outer elastic sealing gasket is disposed in the assembly groove. The water-stop sleeve includes an outer sleeve with one end abutting against the outer elastic sealing gasket and an inner sleeve screwed into the outer sleeve. The inner sleeve is fitted onto the segment bolt and threadedly fixed. The inner elastic sealing gasket is fitted onto the segment bolt and sandwiched between the inner sleeve and the outer sleeve.

[0008] Optionally, the fixing bolt is a high-strength bolt.

[0009] Optionally, the outer elastic sealing gasket is adhered to the reserved groove of the outer sleeve using waterproof strong adhesive.

[0010] Optionally, the inner wall of the outer sleeve and the outer wall of the inner sleeve are provided with mating threads.

[0011] Optionally, the segment bolt has a first threaded portion that is threaded to the segment and a second threaded portion that is threaded to the inner sleeve.

[0012] Optionally, the diameter of the segment bolt section assembled with the inner sleeve is 2 mm smaller than the inner diameter of the inner sleeve.

[0013] Optionally, the materials used to make the inner elastic sealing gasket and the outer elastic sealing gasket are selected from any one of EPDM rubber, silicone rubber, nitrile rubber gaskets, and water-swellable rubber.

[0014] Optionally, both the inner elastic sealing gasket and the outer elastic sealing gasket are made of EPDM rubber.

[0015] The beneficial effects of this application are as follows:

[0016] I. Improved waterproofing of bolt holes: Compared with the original waterproofing system for bolt holes, this application adds a sealing and waterproofing system by installing a water-stop sleeve in the middle of the bolt, which greatly improves the waterproofing capability of the bolt hole.

[0017] 2. Strong integrity and less affected by bolt misalignment: The water-stop sleeve provided in this application deforms the waterproof sealing gasket inside the sleeve by squeezing it with the inner sleeve, so that the waterproof sealing gasket firmly wraps the bolt; after the water-stop sleeve is installed, the water-stop sleeve and the pipe segment form an integral whole, and the elastic sealing gasket inside the water-stop sleeve is elastic and can be deformed at will, so that the water-stop sleeve is less affected by the misalignment between the pipe segments and the bolt misalignment.

[0018] Third, simple construction: The first part of the installation of the water-stop sleeve provided in this application is to fix it inside the pipe segment by tightening the fixing bolts, while the second part of the installation is indirectly completed during the process of tightening the pipe segment bolts. The construction process required by this application is relatively simple.

[0019] IV. Scientific and Reasonable: The waterproof sleeve provided in this application can be tested for its waterproofing ability through relevant waterproofing tests, and the double waterproofing design is scientific and reasonable, which has guiding significance for actual engineering. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 A schematic diagram illustrating the application structure of the sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts provided in this embodiment of the application;

[0022] Figure 2 This is a schematic diagram of the structure of the bolt holes for the inter-segment joints provided in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the segment bolts provided in the embodiments of this application;

[0024] Figure 4 for Figure 3 Enlarged view of section A. Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] The sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0028] Please see Figures 1 to 3 This application provides a sealing and waterproof sleeve for the middle connection of the segment bolts in a shield tunnel. It is used to be sleeved on the segment bolts 2 assembled on the segment 1 to improve the waterproof capability of the bolt holes used to install the segment bolts 2.

[0029] The waterproof sleeve includes a water-stop sleeve 3, a fixing bolt 4, an outer elastic sealing gasket 5, and an inner elastic sealing gasket 6. The bolt hole is provided with an assembly groove (not labeled), and the water-stop sleeve is installed in the assembly groove by the fixing bolt 4.

[0030] Specifically, the fixing bolt 4 is a high-strength bolt.

[0031] The water-stop sleeve 3 includes an outer sleeve 31 with one end abutting against the outer elastic sealing gasket 5 and an inner sleeve 32 screwed into the outer sleeve 31.

[0032] The outer elastic sealing gasket 5 is adhered to the reserved groove in the outer sleeve 31 using waterproof and strong adhesive, as detailed in [reference needed]. Figure 2 As shown, the outer sleeve 31 has a recessed groove on the side facing the tube segment 1, and the outer elastic sealing gasket 5 is embedded in the reserved groove. In this way, water can be prevented from leaking from the gaps in the outer wall of the outer sleeve 31.

[0033] When the water-stop sleeve 3 is installed, the inner elastic sealing gasket 6 is squeezed by the outer sleeve 31 and the inner sleeve 32. The applied pressure causes the inner elastic sealing gasket 6 to squeeze and wrap the segment bolt 2, thereby making the middle of the segment bolt 2 sealed and able to resist water pressure.

[0034] Specifically, the inner wall of the outer sleeve and the outer wall of the inner sleeve are provided with mating threads.

[0035] The inner sleeve 32 is fitted onto the segment bolt 2 and fixed by thread.

[0036] Specifically, the segment bolt 2 is provided with a first threaded portion 21 that is threaded to the segment 1 and a second threaded portion 22 that is threaded to the inner sleeve 32.

[0037] Combined Figure 4 As shown, the segment bolt 2 has a stepped structure, including a first part 23 with the first threaded portion 21 and a second part 24 with the second threaded portion 22. The diameter of the second part 24 is 4 mm larger than the diameter of the first part 23.

[0038] Furthermore, the diameter of the second part 24 assembled with the inner sleeve 32 is 2 mm smaller than the inner diameter of the inner sleeve 32.

[0039] During the installation of the segment bolt 2, the second threaded portion 22 of the second part 24 of the segment bolt 2 gradually tightens the inner sleeve 32, causing the inner sleeve 32 to rotate. This causes the external thread of the inner sleeve 32 to gradually tighten with the internal thread of the outer sleeve 31, thereby generating pressure on the inner elastic sealing gasket 6. This causes the inner elastic sealing gasket 6 to compress and deform, gradually wrapping around the segment bolt 2, thus creating the ability to resist water flow into the segment bolt 2. The inner elastic sealing gasket 6 is adhered to the surface of the steel plate reserved inside the wall of the outer sleeve 31 by waterproof strong adhesive. The pressure applied during the installation of the inner sleeve 32 causes the inner elastic sealing gasket 6 to compress and deform, gradually wrapping around the segment bolt 2, thereby creating the ability to resist water flow into the segment bolt 2.

[0040] The water-stop sleeve 3 forms a two-layer waterproofing system. The first layer of waterproofing takes effect after the fixing bolts 4 tighten it onto the surface of the segment 1, and the second layer of waterproofing takes effect after the segment bolts 2 are installed. The water-stop sleeve 3 is a single unit and is less affected by the opening and misalignment of the segment.

[0041] The inner elastic sealing gasket 6 is sleeved on the segment bolt 2 and sandwiched between the inner sleeve 32 and the outer sleeve 31.

[0042] Both the inner elastic sealing gasket 6 and the outer elastic sealing gasket 5 are made of EPDM rubber. The use of EPDM rubber as a highly elastic material provides excellent durability.

[0043] The sealing gasket is a closed circle and is made by rubber compression. The manufacturing process is simple and highly adaptable. However, this application is not limited to this form. The material for making the sealing gasket can also be one of silicone rubber, nitrile rubber, and water-swellable rubber. The shape can be one of a closed circle, rhombus, or polygon, or a hollow circle, rhombus, or polygon. The implementation steps are the same as in this example.

[0044] In shield tunnel waterproofing systems, when the outer sealing gasket fails, water flow can easily breach the bolt holes, causing leakage and rendering the inner sealing gasket ineffective. The waterproof sleeve proposed in this application adds an extra layer of waterproofing to the original bolt hole waterproofing system, forming a reliable waterproof barrier at the midpoint of the segment bolt connection. This effectively prevents water from entering the bolt holes, reducing the risk of leakage, improving the safety and long-term stability of the tunnel during construction and operation, and lowering construction costs. This application provides a feasible method for waterproofing the midpoint bolt connections of shield tunnel segments in engineering applications.

[0045] The beneficial effects of this application are as follows:

[0046] I. Improved waterproofing of bolt holes: Compared with the original waterproofing system for bolt holes, this application adds a sealing and waterproofing system by installing a water-stop sleeve in the middle of the bolt, which greatly improves the waterproofing capability of the bolt hole.

[0047] 2. Strong integrity and less affected by bolt misalignment: The water-stop sleeve provided in this application deforms the waterproof sealing gasket inside the sleeve by squeezing it with the inner sleeve, so that the waterproof sealing gasket firmly wraps the bolt; after the water-stop sleeve is installed, the water-stop sleeve and the pipe segment form an integral whole, and the elastic sealing gasket inside the water-stop sleeve is elastic and can be deformed at will, so that the water-stop sleeve is less affected by the misalignment between the pipe segments and the bolt misalignment.

[0048] Third, simple construction: The first part of the installation of the water-stop sleeve provided in this application is to fix it inside the pipe segment by tightening the fixing bolts, while the second part of the installation is indirectly completed during the process of tightening the pipe segment bolts. The construction process required by this application is relatively simple.

[0049] IV. Scientific and Reasonable: The waterproof sleeve provided in this application can be tested for its waterproofing ability through relevant waterproofing tests, and the double waterproofing design is scientific and reasonable, which has guiding significance for actual engineering.

[0050] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0051] Furthermore, it should be noted that the scope of the methods and systems in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0052] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A sealing and waterproof sleeve for the middle connection of shield tunnel segment bolts, used to be fitted onto the segment bolts assembled on the segments to improve the waterproof capability of the bolt holes used to install the segment bolts, characterized in that, The waterproof sleeve includes a water-stop sleeve, a fixing bolt, an outer elastic sealing gasket, and an inner elastic sealing gasket. The bolt hole has an assembly groove, and the water-stop sleeve is installed in the assembly groove by the fixing bolt. The outer elastic sealing gasket is disposed in the assembly groove. The water-stop sleeve includes an outer sleeve and an inner sleeve. One end of the outer sleeve abuts against the outer elastic sealing gasket. The inner wall of the outer sleeve has an internal thread, and the outer wall of the inner sleeve has an external thread that mates with the internal thread. The inner sleeve is screwed into the outer sleeve. The segment bolt has a stepped structure, including a first part and a second part. The first part is provided with a first threaded portion that is threaded to the segment, and the second part is provided with a second threaded portion that is threaded to the inner sleeve. The diameter of the second part is larger than the diameter of the first part. The inner sleeve is sleeved on the second part of the segment bolt and is threaded to and fixed to the second threaded portion. The inner elastic sealing gasket is sleeved on the segment bolt and sandwiched between the inner sleeve and the outer sleeve; During the tightening of the segment bolt, the segment bolt drives the inner sleeve to rotate through the second threaded portion. Through the engagement of the external thread and the internal thread, the inner sleeve generates axial displacement, thereby applying extrusion force to the inner elastic sealing gasket, causing the inner elastic sealing gasket to compress and deform and tightly wrap around the segment bolt.

2. The sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts according to claim 1, characterized in that, The outer elastic sealing gasket is attached to the reserved groove of the outer sleeve with waterproof strong adhesive.

3. The sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts according to claim 1, characterized in that, The diameter of the segment bolt section assembled with the inner sleeve is 2 mm smaller than the inner diameter of the inner sleeve.

4. The sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts according to claim 1, characterized in that, The fixing bolts secure the outer sleeve to the surface of the tube segment.

5. The sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts according to claim 1, characterized in that, Both the inner elastic sealing gasket and the outer elastic sealing gasket are closed circular sealing gaskets made of EPDM rubber.

6. The sealing and waterproof sleeve at the middle connection of the shield tunnel segment bolts according to claim 1, characterized in that, The inner elastic sealing gasket is pre-attached to the inner wall step surface of the outer sleeve using waterproof strong adhesive.

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