Preliminary support construction hanging plate for broken stratum of water-rich tunnel

Abstract

The utility model relates to the technical field of tunnel engineering construction, in particular to a primary support construction hanging plate for a broken stratum of a water-rich tunnel. The problem that the primary support construction quality is difficult to guarantee when large-area bulk water is encountered during water-rich tunnel broken stratum construction is solved, and the primary support structure comprises a plurality of panels which are connected with one another and are installed along the outer arc of a primary support steel arch; the fixed cross beam is mounted along the inner arc of the primary support steel arch; the pull rods are connected between the panel and the fixed cross beam; the pull rod is provided with a PVC pull rod hole channel used for grouting and filling.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel engineering construction, and specifically relates to a hanging plate for the initial support construction of a water-rich tunnel in a broken stratum. Background Technique

[0002] With the increasing expansion of the construction scale of railways in the southwestern region of China, in the southwestern region at the transition between the Sichuan Basin and the Qinghai-Tibet Plateau, due to the strong incision of water systems such as the Minjiang River and the Dadu River, the terrain has a large elevation difference, dense ravines, and complex regional engineering geology. Mountain tunnels passing through fault zones, active fault zones, etc. are affected by tectonics, and the rock mass is relatively broken. During the construction process, problems such as roof collapse, water inrush and mud burst, and large deformation are extremely likely to occur. At present, during the construction of a water-rich tunnel in a broken stratum, when encountering a large area of scattered water, it is difficult to guarantee the construction quality of the initial support, resulting in the quality of the shotcrete not meeting the design requirements, low construction efficiency, a certain lag in the initial support, and the inability to timely and effectively support and seal the broken stratum, making it difficult to control the occurrence of tunnel mud inrush, water inrush, collapse, and deformation, seriously affecting the construction safety and quality. Summary of the Invention

[0003] The utility model aims to solve the problem that it is difficult to guarantee the construction quality of the initial support when encountering a large area of scattered water during the construction of a water-rich tunnel in a broken stratum, and provides a hanging plate for the initial support construction of a water-rich tunnel in a broken stratum.

[0004] The utility model adopts the following technical solutions: A hanging plate for the initial support construction of a water-rich tunnel in a broken stratum, characterized in that it includes:

[0005] Multiple panels, which are connected to each other and installed along the outer arc of the initial support steel arch;

[0006] A fixed cross beam, which is installed along the inner arc of the initial support steel arch;

[0007] Multiple tie rods, which are connected between the panels and the fixed cross beam; PVC tie rod holes are provided on the tie rods for grouting filling.

[0008] In some embodiments, a Y-shaped card slot is provided at the lower edge of the panel, and the upper edge of the panel can be clamped in the Y-shaped card slot, and the Y-shaped card slot is used to connect adjacent panels.

[0009] In some embodiments, a plurality of tie rod fixing bolt holes are provided in the middle of the panel, and the tie rod fixing bolt holes are evenly arranged on the panel; a plurality of tie rod fixing hole positions corresponding to the tie rod fixing bolt holes one by one are provided in the middle of the fixed cross beam, and the tie rods are arranged between the tie rod fixing bolt holes and the tie rod fixing hole positions.

[0010] In some embodiments, the panel is closely attached and connected to the initial support steel arch.

[0011] In some embodiments, a sealing strip is provided at the joint of two adjacent panels. The sealing strip is made of rubber and is pasted at the joint of the panels.

[0012] In some embodiments, a steel bar radial welding connection is adopted between the tie rod fixing bolt holes and the panel.

[0013] Compared with the prior art, the present utility model adopts an initial support construction hanging plate for a water-rich tunnel broken stratum. During the initial support construction operation of a water-rich tunnel broken stratum, the large-area rain-like water outflow on the excavation surface will affect the safety and quality of the initial support construction. By means of the initial support hanging plate construction, while improving the quality of the initial support concrete, the construction risk is greatly reduced, the construction speed is increased, the working environment is improved, and the problems such as the great difficulty in the initial support construction of the water-rich tunnel broken stratum, the difficult quality assurance, and the low construction efficiency are effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the installation cross-sectional view of the present utility model;

[0015] Figure 2 is the side view of the panel installation of the present utility model;

[0016] Figure 3 is the schematic plan view of the panel;

[0017] Wherein, 1 is the panel; 2 is the Y-shaped groove of the panel; 3 is the railing fixing bolt hole; 4 is the fixed cross beam; 5 is the tie rod fixing hole of the fixed cross beam; 6 is the tie rod hole channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] An initial support construction hanging plate for a water-rich tunnel broken stratum includes: a plurality of panels 1, which are connected to each other and are installed along the outer arc of the initial support steel arch; a fixed cross beam 4, which is installed along the inner arc of the initial support steel arch; a plurality of tie rods, which are connected between the panel 1 and the fixed cross beam 4; and a PVC tie rod hole channel 6 is provided on the tie rod for grouting filling.

[0020] A Y-shaped card slot 2 is provided at the lower edge of the panel 1, and the upper edge of the panel 1 can be clamped in the Y-shaped card slot 2, and the Y-shaped card slot 2 is used to connect adjacent panels.

[0021] Multiple tie rod fixing bolt holes 3 are arranged in the middle of the panel 1, and the tie rod fixing bolt holes 3 are evenly distributed on the panel 1; multiple tie rod fixing hole positions 5 corresponding to the tie rod fixing bolt holes 3 one by one are arranged in the middle of the fixed cross beam 4, and the tie rod is arranged between the tie rod fixing bolt holes 3 and the tie rod fixing hole positions 5.

[0022] A sealing strip is arranged at the joint of two adjacent panels 1. The sealing strip is made of rubber and is pasted at the joint of the panels 1.

[0023] As Figures 1 to 3 shown, for the initial support hanging board in the construction of a water-rich tunnel in broken strata, after the excavation of the face in the water-rich tunnel in broken strata, a large area of scattered water appears on the support profile surface and cannot be centrally collected and drained. After the danger removal operation is completed, the initial support steel frame is positioned and lofted for installation. The arch foot connecting plate of the initial support steel arch is used as the bottom support for the installation of the panel 1, and the Y-shaped card slot 2 is arranged at the lower edge of the panel as the support for the installation of the previous panel. The panels are connected through the card slots and are installed along the outer arc of the initial support steel arch. Installing along the outer arc of the initial support can effectively block the scattered water and falling rock blocks on the excavation surface, improve the working environment, ensure construction safety, and ensure the construction quality of shotcrete. In the later stage, parallel operation grouting is required to fill the voids behind the initial support. Multiple tie rod fixing bolt holes 3 are arranged in the middle of the panel 1, and the tie rod fixing bolt holes are evenly arranged in the middle of the panel. The panel 1 is closely installed with the initial support steel arch. The fixed cross beam 4 is installed on the other side of the steel frame. Multiple tie rod fixing hole positions 5 are arranged in the middle of the fixed cross beam 4. A PVC tie rod hole channel 6 is arranged between the fixed cross beam and the panel 1. The fixed cross beam and the panel 1 are connected and fixed through the tie rod 7. After the panel 1 is fixed, the initial support shotcrete and bolting operation is carried out. In the next cycle of operation, the hanging board of this cycle is removed and installed in the next cycle for recycling. When the face excavates and advances 5m - 10m each time, the void filling grouting operation of the initial support is carried out through the tie rod hole channel 6 to ensure that the initial support is closely attached to the surrounding rock surface without voids.

[0024] Tie rod fixing bolt holes are evenly arranged on both sides of the panel 1. The panel is closely installed with the initial support steel arch. When the panel is installed on the outside of the initial support steel arch, a separate fixed cross beam 4 needs to be set. Multiple tie rod fixing hole positions 5 are arranged in the middle of the fixed cross beam 4; when the panel is installed on the inside of the initial support steel arch, longitudinal connecting steel bars are used to increase the fixing bolt holes and serve as the fixed cross beam 4.

[0025] A tie rod hole channel 6 is arranged between the fixed cross beam 4 and the panel 1, which is used as the construction hole channel for bolts and the drain hole during the initial support operation. During the subsequent grouting construction operation, it can be used as the low-pressure grouting anchorage section. The number of tie rod hole channels 6 can be increased according to the construction site requirements to facilitate the construction of subsequent processes.

[0026] The working principle of the present utility model is:

[0027] During the construction of a water-rich tunnel in a fractured formation, when encountering a large area of scattered water, in order to quickly seal the excavation face and avoid the phenomenon of landsliding caused by the long-term exposure of the excavation face, after the installation of the initial support steel frame, hanging plates are installed along the outer arc of the steel arch to intercept the large area of scattered water outside the steel arch, improve the working environment, reduce the construction difficulty of shotcrete, and improve the construction efficiency and quality of the initial support concrete. Under certain collection conditions on the excavation face, the rain-like water is drained. Hanging plates are installed on the inner arc of the initial support steel arch, and cast-in-place concrete support is used at the concentrated water outlet to ensure the quality of the initial support concrete, provide timely support for the excavation face, and avoid local landsliding caused by the long-term exposure of the excavation face, which affects the construction safety and quality.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hanging board for initial support construction of broken strata in a water-rich tunnel, characterized in that: include: A plurality of panels (1), wherein the panels (1) are connected to each other and installed along the outer arc of the initial support steel arch; A fixed crossbeam (4), wherein the fixed crossbeam (4) is installed along the inner arc of the initial support steel arch frame; A plurality of tie rods are connected between the panel (1) and the fixed crossbeam (4); and PVC tie rod holes (6) are provided on the tie rods for grouting and filling.

2. The hanging plate for initial support construction of broken strata in a water-rich tunnel according to claim 1 is characterized in that: The lower edge of the panel (1) is provided with a Y-shaped slot (2), and the upper edge of the panel (1) can be snapped into the Y-shaped slot (2). The Y-shaped slot (2) is used to connect adjacent panels.

3. The hanging board for initial support construction of broken strata in water-rich tunnel according to claim 1 is characterized in that: A plurality of tie rod fixing bolt holes (3) are arranged in the middle of the panel (1), and the tie rod fixing bolt holes (3) are evenly arranged on the panel (1); a plurality of tie rod fixing hole positions (5) corresponding one to one with the tie rod fixing bolt holes (3) are arranged in the middle of the fixed crossbeam (4), and the tie rod is arranged between the tie rod fixing bolt holes (3) and the tie rod fixing hole positions (5).

4. The hanging board for initial support construction of broken strata in a water-rich tunnel according to claim 1 is characterized in that: The panel (1) is tightly fitted and connected to the initial supporting steel arch frame.

5. The hanging board for initial support construction of broken strata in water-rich tunnel according to claim 1 is characterized in that: A sealing strip is provided at the connection between two adjacent panels (1); the sealing strip is made of rubber and is adhered to the connection between the panels (1).

6. The hanging board for initial support construction of broken strata in a water-rich tunnel according to claim 3 is characterized in that: The tie rod fixing bolt hole (3) and the panel (1) are connected by steel bar radial welding.

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