CN204283211U - Advanced support pipe shed pore-forming system for extremely-broken water-rich weak surrounding rock tunnel - Google Patents

Abstract

The utility model discloses a hole-forming system for an advanced support pipe shed for extremely broken, water-rich and weak surrounding rock tunnels, which solves the problem of difficult construction of an advanced pipe shed for tunnels with broken, weak, water-rich and shallow buried sections. Including that a down-the-hole drilling machine (3) and an air compressor (4) are installed in the excavated tunnel (2), and an advanced drilling hole (7) is formed in the extremely broken and weak tunnel surrounding rock (1). A follow-up pipe shed (6) is arranged in the borehole (7), and the front section of the follow-up pipe shed (6) is provided with a pipe shed advancing stopper (9), which follows the drill pipe (5) on the down-the-hole drilling machine (3). ) is set in the follow-up pipe shed (6), the front end of the drill pipe is provided with a pipe shoe (10), and the front side of the pipe shoe (10) is in movable contact with the pipe shed push block (9). An eccentric drill bit (8) is provided, and the tail end of the drill rod is connected to the propeller (11) of the down-the-hole drilling rig. The utility model improves the construction quality of the advanced pipe shed and shortens the construction time.

Description

Pre-support pipe shed hole forming system for extremely broken water-rich and weak surrounding rock tunnels

technical field

The utility model relates to a hole-forming system for a tunnel support pipe shed.

Background technique

At present, in the process of tunnel construction, the advanced support of pipe shed is widely used in the construction of weak, broken, water-rich or shallow buried sections, and has become an extremely important safety guarantee measure before tunnel excavation. Conventional advanced pipe shed construction is roughly divided into two processes: one is to use ordinary down-the-hole drilling rigs for advanced drilling, and the other is to use drilling rigs or excavators to install pipe sheds on the hard top. In the process of conventionally using down-the-hole drilling rigs to build pipe sheds, it is easy to drill holes but difficult to form holes when faced with weak, broken, and water-rich shallow tunnels. As a result, the pipe shed cannot be installed in place according to the design indicators, and during the drilling process, a large number of collapsed rock mass virtual slag directly causes a sharp increase in the propulsion resistance of the drill pipe of the down-the-hole drilling rig. Great damage.

Contents of the invention

The utility model provides an advanced support pipe shed hole forming system for extremely broken, water-rich and weak surrounding rock tunnels, which solves the problem of difficult construction of the surrounding rock broken, weak, water-rich and shallow buried section of the tunnel ahead of the pipe shed, poor construction quality and problems. Technical issues with high cost input.

The utility model solves the above technical problems through the following solutions:

A tunnel-forming system for advanced support pipe shed of extremely broken water-rich and weak surrounding rock tunnel, including the excavated tunnel, the extremely broken and weak tunnel surrounding rock in front of the excavated tunnel face, and a follower is set in the excavated tunnel The pipe down-the-hole drilling rig and air compressor form an advanced drilling hole in the extremely broken and weak tunnel surrounding rock, and a follow-up pipe shed is set in the advanced drilling hole, and a pipe shed propulsion block is set at the front section of the follow-up pipe shed. The drill pipe on the pipe down-the-hole drilling rig is set in the follow-up pipe shed, the front end of the drill pipe is provided with a pipe shoe, and the front side of the pipe shoe is movably abutted with the pipe shed advancing stopper, and the drill pipe head is provided with an eccentric The drill bit and the tail end of the drill pipe are connected to the propeller of the down-the-hole drilling rig, and the propeller is connected with the air compressor through the high-pressure air pipe.

Both the follow-up pipe shed and the drill pipe can be assembled and lengthened.

The utility model utilizes the pipe shed steel pipe synchronously followed up with the drill pipe as the slag retaining casing to protect the hole and protect the drill pipe while drilling, which greatly reduces the power load of the down-the-hole drilling machine and reduces the damage and maintenance costs of the drill pipe. cost input. At the same time, the drilling process is carried out simultaneously with the pipe shed installation process, which greatly improves the construction quality of the advanced pipe shed, simplifies the process, shortens the construction time, and greatly reduces the cost investment.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic structural view of the front end of the drill pipe 5 of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail:

A hole-forming system for an extremely broken, water-rich and weak surrounding rock tunnel with advanced support pipe shed, including an excavated tunnel 2, an extremely broken and weak tunnel surrounding rock 1 in front of the tunnel face of the excavated tunnel 2, and an excavated tunnel 2 A follow-up pipe down-the-hole drilling rig 3 and an air compressor 4 are installed in the center, and an advance borehole 7 is formed in the extremely broken and weak tunnel surrounding rock 1, and a follow-up pipe shed 6 is arranged in the advance borehole 7, and the follow-up pipe shed 6 The front section of the pipe shed is provided with a pipe shed propulsion block 9, and the drill pipe 5 on the pipe down-the-hole drilling machine 3 is arranged in the follow-up pipe shed 6. The front end of the drill pipe 5 is provided with a pipe shoe 10, and the front end of the pipe shoe 10 is connected to the The shed propulsion block 9 is movably connected together, and an eccentric drill bit 8 is arranged at the head of the drill pipe 5. The tail end of the drill pipe 5 is connected to the propeller 11 of the down-the-hole drilling rig 3, and the propeller 11 passes through the high-pressure air pipe. Connected with air compressor 4.

Follow-up pipe shed 6 and drilling rod 3 all can be assembled and lengthened. The advanced support pipe shed hole forming system for extremely broken, water-rich and weak surrounding rock tunnels introduces the original down-the-hole drilling rig into the tunnel advance support pipe shed construction, uses the existing air compressor system in the tunnel as the power source, and the drilling process During the process, the pipe shed is advanced synchronously with the drill pipe, and the pipe shed is installed in place while the hole is formed.

Claims (2)

1. A hole-forming system for tunnels with extremely broken, water-rich and weak surrounding rocks with advanced support, pipe shed, including the excavated tunnel (2), and the extremely broken and weak tunnel surrounding rock (1) in front of the excavated tunnel (2). ), which is characterized in that a down-the-hole drilling rig (3) and an air compressor (4) are installed in the excavated tunnel (2), and advanced drilling ( 7), a follow-up pipe shed (6) is set in the advance drilling (7), and the front section of the follow-up pipe shed (6) is provided with a pipe shed advancing stopper (9), which follows the pipe down-the-hole drilling rig (3) The drill pipe (5) is set in the follow-up pipe shed (6), the front end of the drill pipe (5) is provided with a pipe shoe (10), and the front end of the pipe shoe (10) moves with the pipe shed push block (9) Abut together, an eccentric drill bit (8) is arranged at the head of the drill rod (5), and the tail end of the drill rod (5) is connected to the propeller (11) of the down-the-hole drilling rig (3), and the propeller ( 11) It is connected with the air compressor (4) through the high-pressure air pipe. 2. According to claim 1, an extremely broken, water-rich and weak surrounding rock tunnel advanced support pipe shed hole forming system, characterized in that the follow-up pipe shed (6) and the drill pipe (3) can be assembled and lengthened of.