Novel embedded sleeve structure of shield tunnel, support mounting structure and method

Abstract

The invention provides a shield tunnel novel embedded sleeve structure which comprises a metal bolt sleeve embedded in a shield tunnel segment and a polymer positioning rod embedded in the shield tunnel segment, the inner wall of the bolt sleeve is provided with an internal thread matched with a bolt, one end of the positioning rod is connected with the bolt sleeve, and the other end of the positioning rod is connected with the metal bolt sleeve. A guide hole for the bolt to stretch into the bolt sleeve is formed in the middle of the positioning rod. The novel embedded sleeve structure of the shield tunnel further comprises an end plug capable of blocking the other end of the positioning rod. The invention further provides a shield tunnel support mounting structure and method. According to the novel embedded sleeve, the high bearing capacity and the reliable anti-loosening performance are guaranteed, meanwhile, the material consumption is optimized, the cost is reduced, and the comprehensive requirements of rail transit engineering for structural safety, economical efficiency and long-term durability are met.

Description

Technical Field

[0001] This invention relates to the field of subway engineering, and in particular to a novel pre-embedded sleeve structure, support installation structure and method for shield tunnels. Background Technology

[0002] Urban rail transit engineering is a complex systems engineering project, involving multiple electromechanical systems such as civil engineering, power supply, lighting, overhead contact system, fire protection, water supply and drainage, communication, and signaling. The cables, pipelines, equipment, and evacuation platforms of these systems all need to be fixed inside the shield tunnel by supports, so the reliable connection between the supports and the tunnel segments is crucial.

[0003] Traditional support fixing methods mainly rely on drilling to install expansion bolts, chemical anchors, or mechanical anchors, but this technology has many drawbacks: (1) drilling damages the tunnel segment structure, affecting the long-term health of the tunnel; (2) construction efficiency is low, construction period is long, and cost is high; (3) construction quality is difficult to control, posing safety hazards. To overcome these problems, pre-embedded technologies (such as pre-embedded channels, pre-embedded sleeves, and their combination modes) are gradually replacing traditional anchors. However, existing pre-embedded technologies still have shortcomings: pre-embedded channels cannot be replaced, making it difficult to meet the 100-year durability requirement, and the cost is high; while traditional stainless steel pre-embedded sleeves have the problems of large steel consumption and high cost; in addition, polymer sleeves have poor mechanical properties, and polymer sleeves generally have insufficient anti-loosening performance, making it difficult to adapt to the vibration environment of long-term train operation, affecting operational safety. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a new type of pre-embedded sleeve structure, support installation structure and method for shield tunnels. This invention solves at least some of the problems in the prior art.

[0005] This invention is implemented as follows:

[0006] This invention provides a novel pre-embedded sleeve structure for shield tunnels, comprising a metal bolt sleeve pre-embedded in a shield tunnel segment and a polymer positioning rod pre-embedded in a shield tunnel segment. The inner wall of the bolt sleeve is provided with an internal thread that mates with the bolt. One end of the positioning rod is connected to the bolt sleeve, and a guide hole is provided in the middle of the positioning rod for the bolt to extend into the bolt sleeve. The novel pre-embedded sleeve structure for shield tunnels also includes an end plug that can seal the other end of the positioning rod.

[0007] Furthermore, one end of the bolt sleeve extends into the positioning rod, and the interior of the positioning rod is provided with a stepped surface surrounding the bolt sleeve.

[0008] Furthermore, the positioning rod is threadedly connected to the bolt sleeve.

[0009] Furthermore, the outer wall of the bolt sleeve is provided with a first abutting plate that abuts against the end face of the positioning rod.

[0010] Furthermore, the end plug is made of rubber or plastic.

[0011] Furthermore, the polymer positioning rod is a plastic positioning rod.

[0012] Furthermore, the bolt sleeve is made of stainless steel.

[0013] Furthermore, the length of the positioning rod is longer than the length of the bolt sleeve.

[0014] The present invention also provides a shield tunnel support installation structure, including a support and bolts, and further including the aforementioned bolt sleeve and positioning rod. The bolt sleeve and the positioning rod are both pre-embedded in the shield tunnel segments. The support is provided with mounting holes for bolts to pass through. The bolts extend into the bolt sleeve through the positioning rod and are threadedly connected to the bolt sleeve.

[0015] The present invention also provides a method for installing a shield tunnel support, which is applied to the support installation structure in the above-mentioned shield tunnel, including the following steps: S1, pre-embedding the bolt sleeve and positioning rod in the shield tunnel segment; S2, removing the end plug on the positioning rod before installing the support; S3, fixing the support to the shield tunnel segment by fixing the bolt and bolt sleeve together.

[0016] The present invention has the following beneficial effects:

[0017] The novel pre-embedded sleeve proposed in this invention consists of a metal bolt sleeve and a polymer positioning rod, which reduces the amount of stainless steel used. While ensuring high load-bearing capacity and reliable anti-loosening performance through the metal bolt sleeve, it also reduces costs and meets the comprehensive requirements of rail transit engineering for structural safety, economy and long-term durability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present 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 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.

[0019] Figure 1 This is a cross-sectional view of a shield tunnel after the installation of the pre-embedded sleeve, provided in an embodiment of the present invention.

[0020] Figure 2 This is a detailed drawing of the novel pre-embedded sleeve provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the first installation step provided in an embodiment of the present invention (embedded sleeve inside the segment).

[0022] Figure 4 Provided for embodiments of the present invention Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 A schematic diagram of installation step two (removing the end plug) provided in an embodiment of the present invention;

[0024] Figure 6 Provided for embodiments of the present invention Figure 5 Enlarged view at point B in the middle;

[0025] Figure 7 A schematic diagram of installation step three provided in an embodiment of the present invention (fixing the bracket with a sleeve using bolts).

[0026] Figure 8 Provided for embodiments of the present invention Figure 7 Enlarged view of point C.

[0027] In the figure: 1. Shield tunnel segment; 2. New type of pre-embedded sleeve; 3. Bolt sleeve; 4. Positioning rod; 5. End plug; 6. Bolt; 7. First abutment plate; 8. Second abutment plate; 9. Bracket; 10. External thread. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] like Figure 2This invention provides a novel pre-embedded sleeve structure for shield tunnels, comprising a metal bolt sleeve 3 and a polymer positioning rod 4 pre-embedded within a shield tunnel segment 1. The inner wall of the bolt sleeve 3 has an internal thread that mates with a bolt 6. One end of the positioning rod 4 is connected to the bolt sleeve 3, and a guide hole is provided in the middle of the positioning rod 4 for the bolt to extend into the bolt sleeve. The novel pre-embedded sleeve structure for shield tunnels also includes an end plug 5 that can seal the other end of the positioning rod 4. This novel pre-embedded sleeve, composed of a metal bolt sleeve 3 and a polymer positioning rod 4, reduces the amount of stainless steel used. While ensuring high load-bearing capacity and reliable anti-loosening performance through the metal bolt sleeve 3, it also reduces costs, meeting the comprehensive requirements of rail transit engineering for structural safety, economy, and long-term durability.

[0031] In this embodiment, one end of the bolt sleeve 3 extends into the positioning rod 4, and the interior of the positioning rod 4 is provided with a stepped surface surrounding the bolt sleeve 3.

[0032] The positioning rod 4 is threadedly connected to the bolt sleeve 3. One end of the bolt sleeve 3 that extends into the positioning rod is provided with an external thread 10, and the inner wall of the positioning rod 4 is provided with an internal thread that mates with it.

[0033] In this embodiment, the outer wall of the bolt sleeve 3 is provided with a first abutting plate 7 that abuts against the end face of the positioning rod.

[0034] In this embodiment, the end plug 5 is a rubber plug or a plastic plug. The end plug 5 is used to prevent concrete slurry from entering the bolt sleeve during the pouring of the tunnel segment concrete, thus protecting the bolt sleeve before use.

[0035] In this embodiment, one end of the end plug 5 extends into the positioning rod 4, and a second abutting plate 8 is provided on the outer wall of the end plug 5 to abut against the end face of the positioning rod. The other end of the end plug 5 is located outside the positioning rod, which facilitates the installation and removal of the end plug 5 by the operator. The outer diameter of the end of the end plug located outside the positioning rod is larger than the outer diameter of the end of the end plug located inside the positioning rod.

[0036] In this embodiment, the polymer positioning rod 4 is a plastic positioning rod, more specifically, a nylon positioning rod. The polymer positioning rod 4 is used to ensure that the bolt 6 can be accurately fixed to the bolt sleeve 3, while ensuring the required embedment depth of the bolt sleeve 3.

[0037] In this embodiment, the bolt sleeve 3 is made of 304 or 316 stainless steel, which is corrosion-resistant and has a longer service life; the bolt sleeve 3 has internal threads for later use in fixing the bracket bolts, and the bolt sleeve 3 is the main load-bearing component.

[0038] In this embodiment, the length of the positioning rod 4 is longer than the length of the bolt sleeve 3.

[0039] Figure 1 This is a cross-sectional view of the shield tunnel after the pre-embedded sleeve has been installed. Figure 1 In the process, there are multiple new type pre-embedded sleeves 2; each of the new type pre-embedded sleeves is pre-embedded in the shield tunnel segment 1 at uniform intervals along the circumference of the shield tunnel.

[0040] Embodiment 2 of the present invention provides a shield tunnel support installation structure, including a support 9 and a bolt 6, and also including the aforementioned bolt sleeve 3 and positioning rod 4. The bolt sleeve 3 and the positioning rod 4 are both pre-embedded in the shield tunnel segment 1. The support 9 is provided with an installation hole for the bolt 6 to pass through. The bolt 6 extends into the bolt sleeve 3 through the positioning rod 4 and is threadedly connected to the bolt sleeve 3 to fix the support 9 on the shield tunnel segment 1.

[0041] Embodiment 3 of the present invention provides a method for installing a shield tunnel support, applied to the support installation structure in the aforementioned shield tunnel, comprising the following steps: S1, pre-embedding the bolt sleeve 3 and the positioning rod 4 within the shield tunnel segment 1; during the pouring of the segment concrete, sealing the end of the positioning rod 4 away from the bolt sleeve 3 with an end plug 5, such as... Figure 3 S2. Before installing bracket 9, remove the end plug 5 from positioning rod 4, such as... Figure 5 S3. The bracket 9 is fixed to the inner wall of the shield tunnel segment 1 by means of bolt 6 and bolt sleeve 3. Figure 7 .

[0042] This invention optimizes the traditional pre-embedded sleeve structure, resulting in a new sleeve that uses less steel, saving approximately 60% of steel. It is more economical while still meeting performance requirements such as load-bearing capacity, and the new sleeve saves approximately 20% in cost compared to the traditional sleeve.

[0043] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel pre-embedded sleeve structure for shield tunnels, characterized in that: The device includes a metal bolt sleeve pre-embedded in the shield tunnel segment and a polymer positioning rod pre-embedded in the shield tunnel segment. The inner wall of the bolt sleeve is provided with an internal thread that mates with the bolt. One end of the positioning rod is connected to the bolt sleeve. A guide hole is opened in the middle of the positioning rod for the bolt to extend into the bolt sleeve. The new pre-embedded sleeve structure for shield tunnels also includes an end plug that can seal the other end of the positioning rod.

2. The novel pre-embedded sleeve structure for shield tunnels as described in claim 1, characterized in that: One end of the bolt sleeve extends into the positioning rod, and the interior of the positioning rod has a stepped surface surrounding the bolt sleeve.

3. The novel pre-embedded sleeve structure for shield tunnels as described in claim 2, characterized in that: The positioning rod is threadedly connected to the bolt sleeve.

4. The novel pre-embedded sleeve structure for shield tunnels as described in claim 1, characterized in that: The outer wall of the bolt sleeve is provided with a first abutting plate that abuts against the end face of the positioning rod.

5. The novel pre-embedded sleeve structure for shield tunnels as described in claim 1, characterized in that: The end plug is made of rubber or plastic.

6. The novel pre-embedded sleeve structure for shield tunnels as described in claim 1, characterized in that: The polymer positioning rod is a plastic positioning rod.

7. The novel pre-embedded sleeve structure for shield tunnels as described in claim 1, characterized in that: The bolt sleeve is made of stainless steel.

8. The novel pre-embedded sleeve structure for shield tunnels as described in claim 1, characterized in that: The length of the positioning rod is longer than the length of the bolt sleeve.

9. A shield tunnel support installation structure, characterized in that: The device includes a bracket and bolts, and further includes a bolt sleeve and a positioning rod as described in any one of claims 1-8. The bolt sleeve and the positioning rod are both pre-embedded in the shield tunnel segment. The bracket is provided with mounting holes for bolts to pass through. The bolts extend into the bolt sleeve through the positioning rod and are threadedly connected to the bolt sleeve.

10. A method for installing a shield tunnel support, applied to the support installation structure in a shield tunnel as described in claim 9, characterized in that, The process includes the following steps: S1, pre-embedding the bolt sleeve and positioning rod inside the shield tunnel segment; S2, removing the end plug on the positioning rod before installing the bracket; S3, fixing the bracket to the shield tunnel segment by connecting the bolt and bolt sleeve with bolts.

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