Shield segment bolt hole protection cover and using method thereof

Abstract

The invention discloses a shield segment bolt hole protection cover and a using method thereof, and relates to the technical field of shield segment bolt hole dust prevention, the shield segment bolt hole protection cover comprises a protection assembly, the protection assembly is installed on a segment assembly, the protection assembly comprises a magnetic attraction strip, and the magnetic attraction strip is fixedly arranged on the protection cover and faces the upper portion of a fastening bolt. And through the magnetic adsorption effect with the fastening bolt, the protective cover is tightly attached to the opening of the bolt hole, and a closed structure for the bolt hole is formed. The protection cover is matched with magnetic attraction of the magnetic attraction strip and the fastening bolt, the protection cover can be tightly attached to an opening of the bolt hole to form a closed structure, in the 6-8-month construction period from installation of the shield segment to pouring of ballast bed concrete, water, dust and sundries generated in multiple procedures such as water pipe laying and chiseling treatment can be effectively prevented from entering the bolt hole, and the service life of the shield segment is prolonged. The fastening bolt is prevented from being rusted, the fastening effect and the structural safety of the fastening bolt on the duct piece are guaranteed, the protection device is suitable for complex tunnel construction scenes, and the protection problem of a traditional bolt hole in an open state is solved.

Description

Technical Field

[0001] The invention relates to the technical field of dust prevention for shield segment bolt holes, in particular to a shield segment bolt hole protection cover and a use method thereof. Background Art

[0002] In the construction process of the shield section, in the key link before pouring the roadbed concrete, in order to ensure that the shield segments and the subsequently poured concrete can form a tight bond and ensure the overall stability of the structure, the industry generally adopts the method of not applying finishing and sealing treatment to the bolt holes. The core purpose of this treatment method is to avoid the finishing material blocking the direct contact between the segments and the concrete, thereby reserving sufficient space for the combination of the two. It is a common practice followed in this construction stage to achieve the structural bonding effect, and it also makes the bolt holes in this stage in a completely open state, and the internal bolts are directly exposed to the environment in the tunnel.

[0003] The period from the completion of shield segment installation to the formal pouring of roadbed concrete is usually 6-8 months. During this period, a number of construction processes need to be carried out in the tunnel, including laying water pipes, laying cables, secondary grouting, extending mud and water pipelines, cleaning the tunnel bottom, roughening the surface, and tying the bottom reinforcement.

[0004] Since the bolt holes are always in an open state, moisture (such as water seepage during water pipe laying, slurry residue during secondary grouting, water accumulation during tunnel bottom cleaning, etc.) and dust (such as debris generated by roughening, dust carried by air flow in the tunnel, impurities during steel bar binding, etc.) generated during the construction of the above-mentioned processes can easily enter the bolt holes. After moisture and dust accumulate in the bolt holes, they will react chemically with the exposed iron bolts, causing the bolts to rust. This rust will not only weaken the mechanical properties of the bolts and affect their tightening effect on the shield segments, but may also further cause the segment connections to loosen, posing a direct and continuous threat to the safety of the installed shield segment structure. Therefore, targeted solutions are urgently needed. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a shield segment bolt hole protection cover and a method of using the same to solve the technical problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a shield segment bolt hole protection cover, comprising:

[0007] The protective assembly is a prefabricated, integrally formed protective cover, which is mounted on a segment assembly. The segment assembly is a shield segment, and bolt holes for installing fastening bolts are provided in the shield segment. The protective assembly also includes a magnetic strip and a disassembly hole. The magnetic strip is fixedly arranged above the protective cover toward the fastening bolt. Through the magnetic attraction with the fastening bolt, the protective cover is tightly fitted to the opening of the bolt hole, forming a closed structure for the bolt hole.

[0008] The outer contour of the protective cover matches the shape of the shield segment's bolt hole opening, and the angle of the bevel at the bottom edge of the protective cover matches the inclination angle of the inner wall of the bolt hole. Under the action of the bevel, it can fully fit with the inner wall of the bolt hole, thereby enhancing the sealing effect.

[0009] There is a certain distance between the bottom of the magnetic strip and the fastening bolt, and they do not directly contact each other. At the same time, the suction between the two ensures that the protective cover and the bolt hole fit tightly.

[0010] The protective cover is made of waterproof and wear-resistant hard plastic with a thickness of 3-5mm. It can withstand slight collisions and dust erosion during construction and will not crack or deform within a one-month service life.

[0011] The protective component is used from the installation of the shield segments to the completion of the roadbed concrete pouring. This phase covers the construction processes including water pipe laying, cable laying, secondary grouting, mud and water pipeline extension, tunnel bottom cleaning, roughening, and bottom reinforcement binding. During the construction of each of the above processes, the protective component can continuously keep the bolt holes closed.

[0012] The disassembly hole is opened on the top surface of the protective cover, and its aperture size is adapted to the insertion operation of a common disassembly tool, and is used to apply external force to separate the protective cover from the bolt hole when needed.

[0013] By adopting the above technical solution, the protective cover is made of waterproof and wear-resistant hard plastic, and the bottom edge bevel matches the angle of the inner wall of the bolt hole. With the magnetic attraction of the magnetic strip and the fastening bolt, it can fit tightly with the bolt hole opening to form a closed structure. During the 6-8 month construction period from the completion of the shield segment installation to the pouring of the roadbed concrete, it can effectively block the moisture, dust and debris generated by multiple processes such as water pipe laying and roughening from entering the bolt hole, avoid rusting of the fastening bolts, and ensure its fastening effect on the segment and structural safety. At the same time, the disassembly hole on the top of the protective cover is convenient for quick disassembly using tools, and can be reused after cleaning, reducing construction costs, adapting to complex tunnel construction scenes, and solving the protection problem of traditional bolt holes in the open state. A method for using a shield segment bolt hole protective cover, the installation and use process of which includes the following steps:

[0014] S1: After the fastening bolts of the shield segments under the trackbed are installed, use a high-pressure air gun to blow out the inside of the bolt holes and wipe the surface of the fastening bolts with a dry cloth to ensure that there is no water, dust or other debris in the bolt holes;

[0015] S2: Align the magnetic strip of the protective assembly with the head of the fastening bolt, so that the edge of the protective cover fits against the surface of the pipe segment at the bolt hole opening. The installation is completed by magnetic attraction. At this time, the protective assembly completely covers the bolt hole opening.

[0016] S3: Within 1 hour before pouring the roadbed concrete, use a screwdriver to insert the disassembly hole and apply outward prying force to separate the protective component from the bolt hole. After removing the protective component, check the condition of the bolt hole to ensure that there is no residual debris before proceeding with subsequent pouring operations.

[0017] After the protective cover is removed through the disassembly hole in step S3, the protective cover is cleaned to remove dust and stains attached to the surface so that the protective assembly can be reused at the bolt holes of other shield segments.

[0018] To sum up, the present invention mainly has the following beneficial effects: the protective cover of the present invention is made of waterproof and wear-resistant hard plastic, the bottom edge bevel matches the angle of the inner wall of the bolt hole, and cooperates with the magnetic adsorption of the magnetic strip and the fastening bolt to tightly fit the bolt hole opening to form a closed structure. During the 6-8 month construction period from the completion of the shield segment installation to the pouring of the roadbed concrete, it can effectively block the moisture, dust and debris generated by multiple processes such as water pipe laying and roughening from entering the bolt hole, avoid rusting of the fastening bolts, and ensure their fastening effect on the segment and structural safety. At the same time, the disassembly hole on the top of the protective cover is convenient for quick disassembly using tools, and can be reused after cleaning, reducing construction costs, adapting to complex tunnel construction scenes, and solving the protection problem when the traditional bolt holes are open. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an enlarged structural diagram of the protection component of the present invention from a first perspective;

[0020] Figure 2 Schematic diagram of the installation state of the segment assembly and the protection assembly of the present invention;

[0021] Figure 3 For the present invention Figure 2 A magnified view of point A;

[0022] Figure 4 It is an enlarged cross-sectional view of a local structure of the present invention;

[0023] Figure 5 This is an enlarged view of the second viewing angle of the protective cover of the present invention;

[0024] Figure 6This is a schematic diagram of the state where the pipe segment assembly of the present invention is not installed with the protection assembly.

[0025] In the figure: 1. Protection assembly; 101. Protection cover; 102. Magnetic strip; 103. Disassembly hole; 2. Segment assembly; 201. Shield segment; 202. Bolt hole; 203. Fastening bolt. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0027] The following describes an embodiment of the present invention based on its overall structure.

[0028] Example 1

[0029] like Figure 1-6 As shown, the protective cover device provided in this embodiment is mainly composed of a protective assembly 1 and a pipe segment assembly 2, and achieves long-term protection of the bolt hole through magnetic sealing, as follows:

[0030] The protection component 1 includes:

[0031] Protective cover 101: It is made of waterproof and wear-resistant hard plastic prefabricated in one piece, with a thickness of 3-5mm. The outer contour fully matches the opening shape of the bolt hole 202 of the shield segment 201. The angle of the bottom edge bevel is consistent with the inclination angle of the inner wall of the bolt hole 202 to ensure full fit.

[0032] Magnetic strip 102: fixed to the side of the protective cover 101 facing the fastening bolt 203, embedded in the protective cover 101 through the engaging hole, maintaining a small gap with the fastening bolt 203 without direct contact, and using magnetic attraction to make the protective cover 101 fit tightly against the opening of the bolt hole 202;

[0033] Disassembly hole 103: opened on the top surface of the protective cover 101, with a hole diameter suitable for inserting a common screwdriver, such as a flat-head or Phillips screwdriver, for applying external force to disassemble the protective cover;

[0034] The segment assembly 2 includes

[0035] Shield segment 201: A precast concrete component with bolt holes 202 inside for installing fastening bolts 203 to connect adjacent segments;

[0036] Fastening bolt 203: A metal bolt installed in the bolt hole 202 with its head exposed inside the bolt hole 202 and magnetically adsorbed with the magnetic strip 102 of the protective cover 101;

[0037] Pre-installation preparation

[0038] After the fastening bolts 203 of the shield segment 201 are installed, use a high-pressure air gun to blow out the inside of the bolt hole 202 to remove residual dust and debris. Then use a dry cloth to wipe the head of the fastening bolt 203 and the area around the opening of the bolt hole 202 to ensure that there is no water accumulation and no debris to avoid affecting the magnetic sealing effect.

[0039] Protective Cover 101 Installation

[0040] Hold the protective cover 101 and align the magnetic strip 102 with the head of the fastening bolt 203 so that the bottom edge of the protective cover 101 fits in contact with the surface of the shield segment 201 at the opening of the bolt hole 202;

[0041] By relying on the magnetic attraction between the magnetic strip 102 and the fastening bolt 203, the protective cover 101 automatically and tightly fits the bolt hole opening to form a closed structure, completely covering the bolt hole 202 to prevent moisture and dust from entering;

[0042] Protective cover 101 disassembly and reuse

[0043] Within 24 hours before the roadbed concrete is poured, insert a screwdriver into the disassembly hole 103 and apply prying force to the outside to overcome the adsorption force between the magnetic strip 102 and the fastening bolt 203 to separate the protective cover 101 from the bolt hole 202;

[0044] After removing the protective cover 101, check the internal condition of the bolt hole 202 to ensure that there is no residual debris; clean the protective cover 101, such as wiping off the dust on the surface, and reuse it to protect the bolt holes 202 of other shield segments 201;

[0045] In general, the service life of the protection assembly 1 is about 6-8 months from the installation of the shield segment 201 to the pouring of the roadbed concrete. During this period, it needs to go through multiple processes such as laying water pipes, laying cables, secondary grouting, tunnel bottom cleaning, roughening, and bottom reinforcement binding. The protection cover 101 always keeps the bolt holes 202 closed.

[0046] At the same time, the edge bevel of the protective cover 101 fits the inner wall of the bolt hole 202, and cooperates with the adsorption force of the magnetic strip 102 to form a tight seal, preventing moisture such as water seepage, grouting residue and dust such as chiseling debris and air dust from entering the bolt hole during the construction process;

[0047] The protective cover 101 is made of hard plastic material and can withstand slight collisions and dust erosion. It will not crack or deform within a 6-8 month service life, ensuring long-term protection effectiveness.

[0048] The non-contact adsorption of the magnetic strip 102 and the fastening bolt 203 ensures that the protective cover 101 fits tightly against the bolt hole opening while avoiding wear caused by direct contact between the two. The angle of the protective cover edge bevel matches the angle of the inner wall of the bolt hole, further enhancing the sealing effect and preventing leakage from the gap.

[0049] The design of disassembly hole 103 allows the protective cover to be quickly disassembled using conventional tools, avoiding damage to the bolt holes or pipe segments by violent operation. The protective cover 101 is made of wear-resistant material and can be reused after cleaning, reducing construction costs.

[0050] This embodiment solves the problem of rusting of the fastening bolts 203 caused by the open state of the bolt holes 202 of the shield segments 201 during construction through the design of a magnetic protective cover 101. The protective cover 101 relies on magnetic force to be quickly installed, tightly fitting the opening of the bolt hole 202, effectively blocking moisture and dust, and ensuring that the fastening bolts 203 do not rust during the 6-8 month construction period. It is easy to disassemble and assemble and is reusable, adapting to the multi-process cross-operation scenario in the tunnel, and ensuring the safety and stability of the connection structure of the shield segments 201.

[0051] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A shield segment bolt hole protection cover, characterized in that: include: A protection assembly (1), wherein the protection assembly (1) is a prefabricated integrally formed protection cover (101), the protection assembly (1) is mounted on a segment assembly (2), the segment assembly (2) is a shield segment (201), and a bolt hole (202) for mounting a fastening bolt (203) is provided in the shield segment (201), the protection assembly (1) further comprising a magnetic strip (102) and a disassembly hole (103), the magnetic strip (102) being fixedly arranged on the protection cover (101) above the fastening bolt (203), and being tightly fitted to the opening of the bolt hole (202) by magnetic attraction with the fastening bolt (203), thereby forming a closed structure for the bolt hole (202); The disassembly hole (103) is opened on the top surface of the protective cover (101), and its aperture size is adapted to the insertion operation of a common disassembly tool, and is used to apply external force to separate the protective cover (101) from the bolt hole (202) when needed.

2. The shield segment bolt hole protection cover according to claim 1, characterized in that: The outer contour of the protective cover (101) matches the opening shape of the bolt hole (202) of the shield segment (201), and the bevel angle of the bottom edge of the protective cover (101) matches the inclination angle of the inner wall of the bolt hole (202). Under the action of the bevel, the protective cover (101) can fully fit with the inner wall of the bolt hole (202), thereby increasing the sealing effect.

3. The shield segment bolt hole protection cover according to claim 1, characterized in that: The protective cover (101) is provided with a snap-fit ​​hole that matches the magnetic strip (102) and is used for snap-fitting and installing the magnetic strip (102).

4. The shield segment bolt hole protection cover according to claim 3, characterized in that: A certain distance is maintained between the bottom of the magnetic strip (102) and the fastening bolt (203) without direct contact, and the protective cover (101) and the bolt hole (202) are tightly fitted by means of the suction force between the two.

5. The shield segment bolt hole protection cover according to claim 1, characterized in that: The use phase of the protection component (1) is from the completion of installation of the shield segment (201) to the completion of pouring the roadbed concrete. The construction processes covered in this phase include water pipe laying, cable laying, secondary grouting, mud and water pipeline extension, tunnel bottom cleaning, roughening, and bottom reinforcement binding. During the construction of each of the above processes, the protection component (1) can continuously maintain the closed state of the bolt hole (202).

6. The shield segment bolt hole protection cover according to claim 1, characterized in that: The protective cover (101) is made of waterproof and wear-resistant hard plastic with a thickness of 3-5 mm, can withstand slight collisions and dust erosion during construction, and will not crack or deform within a service life of 6-8 months.

7. A method for using a shield segment bolt hole protection cover, characterized in that The shield segment bolt hole protection cover according to any one of claims 1 to 6 is installed and used, and the installation and use process includes the following steps: S1: After the fastening bolts (203) of the shield segment (201) under the trackbed are installed, a high-pressure air gun is used to blow out the inside of the bolt hole (202), and a dry cloth is used to wipe the surface of the fastening bolt (203) to ensure that there is no water, dust or other debris in the bolt hole (202); S2: Align the magnetic strip (102) of the protection component (1) with the head of the fastening bolt (203), so that the edge of the protection cover (101) fits with the surface of the pipe segment at the opening of the bolt hole (202), and complete the installation by magnetic attraction. At this time, the protection component (1) completely covers the opening of the bolt hole (202); S3: Within 24 hours before pouring the roadbed concrete, insert a screwdriver into the disassembly hole (103) and apply an outward prying force to separate the protective component (1) from the bolt hole (202). After removing the protective component (1), check the state inside the bolt hole (202) to ensure that there is no residual debris before proceeding with subsequent pouring operations.

8. The method for using the shield segment bolt hole protection cover according to claim 7, characterized in that: After the protective cover (101) is removed through the disassembly hole (103) in step S3, the protective cover (101) is cleaned to remove dust and stains attached to the surface so that the protective assembly (1) can be reused at the bolt hole (202) of another shield segment (201).

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