CN103953361A - Clearance strengthening system for serious cracks of existing tunnel arch lining - Google Patents

Abstract

The invention relates to a system for reinforcing the existing tunnel arch lining with severe cracks and clear space. The arch of the existing tunnel lining is prone to damage, and it can only be properly reinforced without demolition and reconstruction. The reinforcement system of the present invention lays steel reinforcement mesh on the arch of the existing concrete lining. In the reinforcement mesh, multiple H-shaped steel frames are arranged longitudinally along the tunnel, and anchor rods are laid. The ends of the anchor rods are fixed on On the H-shaped steel frame; holes are drilled at intervals between the anchor rods at each H-shaped steel frame and pre-buried arch grouting pipes are used to grout the back of the lining to fill the void; the sprayed concrete covers the H in the existing concrete lining Type steel frame. The present invention grouts the back of the severely cracked part of the arch lining of the existing tunnel, fills the cavity, and selects H-shaped steel frame to cooperate with steel mesh, anchor rod, and sprayed concrete to form a comprehensive reinforcement system to reinforce the serious cracking disease of the arch. , Simple construction, saving investment.

Description

The arch lining of the existing tunnel is severely cracked and there is a clearance reinforcement system

technical field

    The invention belongs to the technical field of tunnel traffic engineering, and in particular relates to an existing tunnel arch lining with serious cracks and a clearance reinforcement system.

Background technique

A large number of tunnels are being built in traffic projects such as railways and highways in China. A large number of tunnels built in mountainous areas in the early days are still in use, and some have reached the design life at that time. Due to construction quality, corrosion environment, concrete durability, ground pressure, etc. Affected by many factors, many tunnels still in use have already had lining cracks, peeling off pieces and other diseases, especially lining arches are more likely to occur. If left unchecked, minor diseases will become serious problems, causing great harm to driving safety , and the tunnel has no conditions for demolition and reconstruction, so it can only be properly reinforced according to the severity of the disease. It is very important to choose economical and reasonable, convenient construction, safe and reliable treatment measures.

Contents of the invention

The purpose of the present invention is to provide an existing tunnel arch lining with severe cracks and headroom reinforcement system, which can effectively deal with concrete cracking diseases, and is suitable for the working condition of the existing tunnel arch lining with severe cracks and headroom.

The technical scheme adopted in the present invention is:

There is a headroom reinforcement system for severe cracks in the arch lining of existing tunnels, which is characterized by:

Reinforcement mesh is laid on the arch of the existing concrete lining. In the reinforcement mesh, multiple H-shaped steel frames are arranged longitudinally along the tunnel, and a number of radial anchors driven into the surrounding rock are arranged at the H-shaped steel frames. The ends of the anchor rods are It is fixed on the H-shaped steel frame through the anchor pad and connecting bolts;

Between the anchor rods at each H-shaped steel frame, holes are drilled at intervals and pre-buried arch grouting pipes are used for grouting behind the lining to fill the void;

The H-shaped steel frame is covered with shotcrete within the existing concrete lining.

There are longitudinal connecting steel bars welded between the H-shaped steel frames.

Both the arch foot of the existing concrete lining and the end of the H-shaped steel frame are provided with steel frame locking foot anchor pipes driven into the surrounding rock.

The anchor rods at each H-shaped steel frame are distributed in a broken line in the transverse direction, and the ends are staggered and fixed on the edge of the H-shaped steel frame.

The present invention has the following advantages:

The present invention grouts the back of the seriously cracked part of the arch lining of the existing tunnel, fills the cavity, and selects the H-shaped steel frame with small height and high rigidity to cooperate with the steel mesh and anchor rod to form a comprehensive reinforcement system, which can repair the serious cracking disease of the arch. The once-and-for-all radical cure has the advantages of simple construction, investment saving, safety and reliability. the

Description of drawings

Figure 1 is a cross-sectional view of the present invention.

Fig. 2 is a plane layout diagram of the present invention.

Figure 3 is a partial detailed view of the present invention.

In the figure, 1-existing concrete lining, 2-anchor rod, 3-reinforcement mesh, 4-arch grouting pipe, 5-H-shaped steel frame, 6-longitudinal connecting steel bar, 7-steel frame locking foot anchor pipe, 8-Anchor backing plate, 9-Connecting bolts, 10-Shotcrete.

Detailed ways

The present invention will be described in detail below in combination with specific embodiments.

The present invention relates to an existing tunnel arch lining with severe cracks and headroom reinforcement system, which is suitable for working conditions where the tunnel arch lining is severely cracked, has clearance, and must be treated. It uses anchors, nets, belts, and grouting. The structure can be arranged continuously or locally in the longitudinal direction of the tunnel according to the needs, which occupies a small space and is easy to construct. The specific structure is as follows: a steel mesh 3 is laid on the arch of the existing concrete lining 1, and a plurality of H-shaped steel frames 5 are arranged longitudinally in the steel mesh 3 along the tunnel, and longitudinal connecting steel bars 6 are welded between the H-shaped steel frames 5. A number of radial bolts 2 driven into the surrounding rock are arranged at the H-shaped steel frame 5 , and the ends of the anchor rods 2 are fixed on the H-shaped steel frame 5 through anchor backing plates 8 and connecting bolts 9 . The anchor rods 2 at the 5 places of each H-shaped steel frame are distributed in a broken line in the transverse direction, and the ends are staggered and fixed on the edge of the H-shaped steel frame 5 . Between the anchor rods 2 at each H-shaped steel frame 5, the arch grouting pipes 4 for grouting behind the lining and filling the voids are pre-embedded. The H-shaped steel frame 5 is covered with shotcrete in the existing concrete lining 1 . Both the arch foot of the existing concrete lining 1 and the end of the H-shaped steel frame 5 are provided with steel frame locking foot anchor pipes 7 driven into the surrounding rock.

The content of the present invention is not limited to the examples listed, and any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is covered by the claims of the present invention.

Claims (4)

1. the serious cracking of existing tunnel Arch lining has headroom reinforcement system, it is characterized in that:

Steel mesh reinforcement (3) is laid in arch in existing concrete lining (1), multiple tracks H shaped steel frame (5) is longitudinally set along tunnel in steel mesh reinforcement (3), at H shaped steel frame (5), locate to arrange some anchor poles radially, that squeeze into country rock (2), anchor pole (2) end is fixed on H shaped steel frame (5) by roof bolt plate (8) and connecting bolt (9);

Between the anchor pole (2) that per pass H shaped steel frame (5) is located, interval punching is embedded with for tamp empty arch Grouting Pipe (4) at lining cutting back-grouting;

In existing concrete lining (1), sprayed mortar covers H shaped steel frame (5).

2. the serious cracking of existing tunnel Arch lining according to claim 1 has headroom reinforcement system, it is characterized in that:

Between H shaped steel frame (5), be welded with longitudinal connecting reinforcement (6).

3. the serious cracking of existing tunnel Arch lining according to claim 2 has headroom reinforcement system, it is characterized in that:

The arch springing place of described existing concrete lining (1) and the end of H shaped steel frame (5) are provided with the steelframe lock pin anchor tube (7) of squeezing into country rock.

4. the serious cracking of existing tunnel Arch lining according to claim 3 has headroom reinforcement system, it is characterized in that:

The anchor pole (2) that per pass H shaped steel frame (5) is located is laterally broken line and distributes, and end is staggered front to back and is fixed on H shaped steel frame (5) edge.