A large-section tunnel secondary lining steel arch fixing device and construction method thereof

Abstract

The invention discloses a large-section tunnel secondary lining steel bar arch fixing device and a construction method thereof. The large-section tunnel secondary lining steel bar arch fixing device comprises an implanted arch part and a secondary lining steel bar connecting part, the implanted arch part comprises a connecting rod and a steel washer ring I, the lower end of the connecting rod has an external thread, and the steel washer ring I is mounted and fixed on the connecting rod; the secondary lining steel bar connecting part is a J-shaped connecting hook, and its straight arm end has an external thread; the upper end of the connecting rod is implanted in the initial support of the tunnel arch, the lower end of the connecting rod passes through the waterproof board and is located below the waterproof board, the steel washer ring I is located above the waterproof board, and a steel washer ring II is mounted on the connecting rod at the lower part of the waterproof board, and a rubber water stop pad is arranged between the waterproof board and the steel washer ring I and between the waterproof board and the steel washer ring II, the steel washer ring II, the rubber water stop pad, the waterproof board, and the steel washer ring I are fastened together by a threaded sleeve connected to the lower end of the connecting rod, and the straight arm end of the connecting hook is connected to the lower end of the threaded sleeve by a thread.

Description

Technical Field

[0001] The present invention relates to a large-section tunnel secondary lining steel bar arch fixing device, belonging to the technical field of tunnel construction. The present invention also relates to a construction method of the large-section tunnel secondary lining steel bar arch fixing device. Background Art

[0002] During tunnel construction, the tunnel secondary lining steel bars generally use double-layer steel mesh. For tunnels with small cross-sections, the secondary lining steel bars can form self-stabilization due to the use of double-layer steel mesh, and no auxiliary measures are needed to fix them. However, for large-section tunnels, due to their large cross-sections, the tunnel secondary lining steel mesh cannot form a self-stabilizing structure and is prone to sinking or even collapse at the arch, posing a large risk to construction quality and safety. The secondary lining steel bars within the arch need to be fixed. At the same time, a secondary lining steel bar fixing device is set on the tunnel arch. Since a waterproof board is designed on the outside of the tunnel secondary lining, the fixing device needs to pass through the waterproof board, which poses a certain risk to tunnel waterproofing.

[0003] For the installation of secondary lining steel bars in large-section tunnels, it is necessary to solve the problem of fixing the secondary lining steel bars on the arch to ensure that the secondary lining steel mesh does not deform. At the same time, it is necessary to solve the problem of water leakage caused by perforation of the waterproof layer outside the arch due to the additional fixing measures on the arch. Summary of the invention

[0004] In view of the above-mentioned defects existing in the prior art, the present invention provides a large-section tunnel secondary lining steel arch fixing device.

[0005] The present invention is realized by the following technical scheme: a large-section tunnel secondary lining steel bar arch fixing device, characterized in that: it comprises an implanted arch part and a secondary lining steel bar connecting part, the implanted arch part comprises a connecting rod and a steel washer ring I, the lower end of the connecting rod has an external thread, the steel washer ring I is sleeved and fixedly connected to the connecting rod, and the steel washer ring I is arranged close to the end of the connecting rod with the external thread; the secondary lining steel bar connecting part is a connecting hook, the connecting hook is J-shaped, and its straight arm end has an external thread; the upper end of the connecting rod implanted in the arch part is fixedly implanted in the initial support of the tunnel arch, The lower end of the connecting rod implanted in the arch part passes through the waterproof board of the tunnel and is located below the waterproof board. The steel gasket ring I implanted in the arch part is located above the waterproof board and close to the lower surface of the initial support of the tunnel arch. A steel gasket ring II is mounted on the connecting rod at the lower part of the waterproof board. Rubber waterstop pads are arranged between the waterproof board and the steel gasket ring I and between the waterproof board and the steel gasket ring II. The steel gasket ring II, the rubber waterstop pad, the waterproof board and the steel gasket ring I are fastened together by a threaded sleeve connected to the lower end of the connecting rod, and the straight arm end of the connecting hook is connected to the lower end of the threaded sleeve by threads.

[0006] In the present invention, the connecting rod implanted in the vault part is fixedly connected to the initial support of the tunnel vault after being implanted in the initial support of the tunnel vault, so as to form a stable connection. In the part passing through the waterproof board, a processing method of steel washer ring I + rubber water stop gasket + waterproof board + rubber water stop gasket + steel washer ring II is adopted, and a threaded sleeve is used for tightening, thereby solving the problem of water leakage after the waterproof board is perforated. Through the connecting hook threadedly connected at the lower end of the threaded sleeve, the curved hook part of the connecting hook can be connected to the tunnel secondary lining steel bar, so as to achieve the purpose of anchoring the tunnel secondary lining steel bar to the vault.

[0007] Furthermore, in order to ensure the structural strength of the fixing device and facilitate processing and manufacturing, the connecting rod and the connecting hook are both made of ribbed steel bars.

[0008] Furthermore, the connecting rod and the connecting hook are both made of Ф16 ribbed steel bars.

[0009] Furthermore, in order to ensure the structural strength of the fixing device and prevent water leakage, the steel gasket ring I and the connecting rod are fully welded.

[0010] Furthermore, to facilitate installation, the rubber water-stop pad in contact with the lower part of the steel gasket ring I is bonded to the steel gasket ring I.

[0011] Furthermore, the depth of the connecting rod implanted into the initial support of the tunnel vault is 240 mm.

[0012] The present invention also provides a construction method of the above-mentioned large-section tunnel secondary lining steel bar arch fixing device, which is characterized by comprising the following steps:

[0013] (a) Fabricate the part to be embedded in the vault and the part to be connected with the secondary lining reinforcement;

[0014] (b) Installation of the implanted vault part: Use anchoring glue to implant the upper end of the connecting rod of the implanted vault part into the initial support of the tunnel vault, then fix the rubber water stop pad to the lower part of the steel pad ring I, and then install the tunnel outer waterproof board. After the lower end of the connecting rod passes through the waterproof board, install the rubber water stop pad and steel pad ring II on the connecting rod at the lower part of the waterproof board in sequence, and then install the threaded sleeve at the lower end of the connecting rod and tighten it;

[0015] (c) The straight arm end of the connecting hook connecting the secondary lining steel bar portion is screwed into the lower end of the threaded sleeve, and the tunnel secondary lining steel bar passes through the bent hook portion of the connecting hook. The tunnel secondary lining steel bar is connected through the bent hook portion of the connecting hook to achieve the purpose of anchoring the tunnel secondary lining steel bar to the arch.

[0016] The beneficial effects of the present invention are as follows: the present invention can anchor the tunnel secondary lining steel bar to the tunnel vault, ensure the stability of the tunnel secondary lining steel bar installation, solve the waterproof problem, and ensure the installation quality and construction safety of the tunnel secondary lining steel bar. The implanted vault part of the present invention is installed before the waterproof board is installed. After the waterproof board is installed, the part passing through the waterproof board adopts the processing method of steel washer Ⅰ+rubber water stop gasket+waterproof board+rubber water stop gasket+steel washer Ⅱ, and is tightened by a threaded sleeve, which solves the problem of water leakage after the waterproof board is perforated. The implanted vault part and the part connecting the secondary lining steel bar of the present invention are connected by a threaded sleeve, which solves the damage to the waterproof board caused by high temperature caused by welding connection, reduces the workload of high-altitude operations on site, and speeds up the construction progress. The present invention adopts a connecting hook to connect with the threaded sleeve, which solves the connection problem with the tunnel secondary lining steel bar on the one hand, and on the other hand, the connection method is also convenient for determining the connection length of the straight arm end of the connecting hook according to the uneven initial support of the tunnel on site, and solves the construction error problem caused by the uneven initial support of the tunnel on site. The present invention has good fixing effect, is safe and reliable, and ensures construction quality and construction safety. The invention has the advantages of simple construction, high construction efficiency, and is conducive to shortening the construction period. The invention is particularly suitable for large-section tunnels and has the advantages of simple operation, strong applicability, low cost, high practicality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention;

[0018] Figure 2 is a front view of the implanted vault portion of the present invention;

[0019] Figure 3 yes Figure 2 A top view of

[0020] Figure 4 It is a schematic diagram of the structure of the connecting hook connecting the second lining steel bar part in the present invention;

[0021] Figure 5 It is a schematic diagram of the implanted vault part of the present invention after being implanted into the tunnel vault for initial support;

[0022] In the figure, 1. connecting rod, 2. steel washer ring I, 3. rubber water stop gasket, 4. waterproof board, 5. rubber water stop gasket, 6. steel washer ring II, 7. threaded sleeve, 8. connecting hook, 801, straight arm end, 802, bent hook part, 9, initial support of tunnel vault, 10, tunnel secondary lining steel bar. DETAILED DESCRIPTION

[0023] The present invention will be further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0024] As shown in the attached drawings, a large-section tunnel secondary lining steel bar arch fixing device includes an implanted arch part and a secondary lining steel bar connecting part. The implanted arch part includes a connecting rod 1 and a steel washer ring Ⅰ2. The connecting rod 1 is made of a 281mm long Ф16 ribbed steel bar. The lower end of the connecting rod 1 has an external thread with a length of 25mm. The steel washer ring Ⅰ2 is a circular ring structure. The steel washer ring Ⅰ2 is made of a 5mm thick steel plate. The outer diameter of the steel washer ring Ⅰ2 is 100mm. The middle of the steel washer ring Ⅰ2 is a through hole that can pass through the connecting rod 1. The steel washer ring Ⅰ2 is sleeved and installed on the connecting rod 1. The steel washer ring Ⅰ2 passes through the connecting rod 1 and is fully welded to the connecting rod 1. The steel washer ring Ⅰ2 is arranged near the end of the connecting rod 1 with an external thread. In this embodiment, the steel washer ring Ⅰ2 is arranged 41m away from the end of the threaded end of the connecting rod 1. The connecting part of the secondary lining steel bar is a connecting hook 8, which is J-shaped and includes a straight arm end 801 and a hook portion 802. The end portion of the straight arm end 801 has an external thread with a thread length of 25 mm, and the hook portion 802 can accommodate the passage of the secondary lining steel bar of the tunnel. The upper end of the connecting rod 1 implanted in the vault part is fixedly implanted in the initial support 9 of the tunnel vault, and the lower end of the connecting rod 1 implanted in the vault part passes through the waterproof board 4 of the tunnel and is located below the waterproof board 4. The steel gasket ring Ⅰ2 implanted in the vault part is located above the waterproof board 4 and is close to the lower surface of the initial support 9 of the tunnel vault. A steel gasket ring Ⅱ6 is mounted on the connecting rod 1 at the lower part of the waterproof board 4. The steel gasket ring Ⅱ6 is 5 mm thick, 100 mm in diameter, and the diameter of the middle hole is 20 mm. A rubber water stop pad 3 is provided between the waterproof plate 4 and the steel washer ring Ⅰ2, and a rubber water stop pad 5 is provided between the waterproof plate 4 and the steel washer ring Ⅱ6. The steel washer ring Ⅱ6, the rubber water stop pad 5, the waterproof plate 4, the rubber water stop pad 3, and the steel washer ring Ⅰ2 are fastened together by a threaded sleeve 7 connected to the lower end of the connecting rod 1. The threaded sleeve 7 has an internal thread that can match the external thread at the lower end of the connecting rod 1 and the external thread at the straight arm end of the connecting hook 8. The straight arm end of the connecting hook 8 is connected to the lower end of the threaded sleeve 7 by threading.

[0025] The construction method of the above-mentioned large-section tunnel secondary lining steel bar arch fixing device comprises the following steps:

[0026] (a) Fabrication of the implanted vault part and the secondary lining steel bar connection part: Figure 2-Figure 4 As shown, the implanted arch part and the part connecting the second lining steel bar are processed and manufactured according to the design. When the steel bar is manufactured, the two ends are cut by a steel bar cutting machine to ensure that the cross section is flat. After the steel pad ring Ⅰ2 and the connecting rod 1 are welded, anti-corrosion treatment is required. Due to the unevenness of tunnel excavation and initial support, the length of the fixing device at each point of the arch is inconsistent. Therefore, the length of the straight arm end 801 connecting the second lining steel bar is completed by the actual length measured on site.

[0027] (b) Installation of the implanted vault part: Use anchoring glue to implant the upper end of the connecting rod 1 of the implanted vault part into the initial support 9 (or surrounding rock) of the tunnel vault, with an implantation depth of 240 mm. Then, glue and fix the rubber water-stop pad 3 to the lower part of the steel gasket ring Ⅰ2. Then, install the tunnel outer waterproof board 4. After the lower end of the connecting rod 1 passes through the waterproof board 4, install the rubber water-stop pad 5 and the steel gasket ring Ⅱ 6 on the connecting rod 1 at the lower part of the waterproof board 4 in sequence. Then, install the threaded sleeve 7 at the lower end of the connecting rod 1 and tighten it. The tightening torque value is not less than 100 N.m. At this point, the implanted vault part of the present invention is installed. Figure 5 shown.

[0028] (c) Screw the straight arm end 801 of the connecting hook 8 connecting the secondary lining steel bar into the lower end of the threaded sleeve 7, and the tunnel secondary lining steel bar 10 passes through the bent hook part 802 of the connecting hook 8. The tunnel secondary lining steel bar 10 is connected through the bent hook part 802 of the connecting hook 8 to achieve the purpose of anchoring the tunnel secondary lining steel bar 10 to the arch, ensuring the installation quality requirements of the secondary lining steel bar. After installation, as shown in the attached Figure 1 shown.

[0029] The fixing device in the present invention can anchor the tunnel secondary lining steel bar to the tunnel vault, ensure the stability of the tunnel secondary lining steel bar installation, solve the waterproof problem, and ensure the installation quality and construction safety of the tunnel secondary lining steel bar. The present invention is particularly suitable for large-section tunnels and has the advantages of simple operation, strong applicability, low cost, high practicality, etc.

[0030] The other parts of this embodiment are all prior art and will not be described in detail here.

Claims

1. A large-section tunnel secondary lining steel arch fixing device, characterized by: The invention comprises a portion implanted in the vault and a portion connected to the secondary lining steel bar. The portion implanted in the vault comprises a connecting rod (1) and a steel washer ring I (2). The lower end of the connecting rod (1) has an external thread. The steel washer ring I (2) is fitted onto and fixedly connected to the connecting rod (1), and the steel washer ring I (2) is arranged close to the end of the connecting rod (1) having the external thread. The portion connected to the secondary lining steel bar is a connecting hook (8). The connecting hook (8) is J-shaped, and its straight arm end has an external thread. The upper end of the connecting rod (1) implanted in the vault is fixedly implanted in the initial support of the tunnel vault. The lower end of the connecting rod (1) implanted in the vault passes through the waterproof board (4) of the tunnel and is located at the waterproof board (4). The steel washer ring I (2) is implanted in the vault part below the waterproof plate (4), and is located above the waterproof plate (4) and is close to the lower surface of the initial support of the tunnel vault. A steel washer ring II (6) is mounted on the connecting rod (1) below the waterproof plate (4). Rubber water-stopping pads are arranged between the waterproof plate (4) and the steel washer ring I (2) and between the waterproof plate (4) and the steel washer ring II (6). The steel washer ring II (6), the rubber water-stopping pad, the waterproof plate (4) and the steel washer ring I (2) are fastened together by a threaded sleeve (7) connected to the lower end of the connecting rod (1). The straight arm end of the connecting hook (8) is connected to the lower end of the threaded sleeve (7) by a thread. The steel washer ring I (2) and the connecting rod (1) are connected by full welding; The depth of the connecting rod (1) implanted into the tunnel vault for initial support is 240 mm.

2. The large-section tunnel secondary lining steel arch fixing device according to claim 1 is characterized by: The connecting rod (1) and the connecting hook (8) are both made of ribbed steel bars.

3. The large-section tunnel secondary lining steel bar arch fixing device according to claim 2 is characterized by: The connecting rod (1) and the connecting hook (8) are both made of Φ16 ribbed steel bars.

4. The large-section tunnel secondary lining steel bar arch fixing device according to claim 1 is characterized by: The rubber water stop pad in contact with the lower part of the steel gasket ring Ⅰ (2) is bonded to the steel gasket ring Ⅰ (2).

5. A construction method for a large-section tunnel secondary lining steel arch fixing device according to any one of claims 1 to 4, characterized in that: The steps include: (a) Fabricate the part to be embedded in the vault and the part to be connected with the secondary lining reinforcement; (b) Installing the implanted vault part: The upper end of the connecting rod (1) of the implanted vault part is implanted into the initial support of the tunnel vault by using anchoring glue, and then the rubber water stop pad is fixed to the lower part of the steel pad ring I (2), and then the tunnel outer waterproof board (4) is installed. After the lower end of the connecting rod (1) passes through the waterproof board (4), the rubber water stop pad and the steel pad ring II (6) are installed on the connecting rod (1) at the lower part of the waterproof board (4) in sequence, and then the threaded sleeve (7) is installed at the lower end of the connecting rod (1) and tightened; (c) The straight arm end of the connecting hook (8) connecting the secondary lining steel bar portion is screwed into the lower end of the threaded sleeve (7), and the tunnel secondary lining steel bar passes through the bent hook portion of the connecting hook (8). The tunnel secondary lining steel bar is connected through the bent hook portion of the connecting hook (8) to achieve the purpose of anchoring the tunnel secondary lining steel bar to the arch.

6. The construction method according to claim 5, characterized in that: In step b, when tightening with the threaded sleeve (7), the tightening torque value is not less than 100 N.m.

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