Blasting construction structure for preventing wellhead hole from being blocked

Abstract

The application discloses a construction structure of hole plugging prevention for well mouth blasting, which comprises a construction structure for constructing a plugging prevention structure at a pilot hole well mouth. When the blasting area is blasted, the flexible steel wire mesh establishes the first rolling prevention measure for large rolling stones; when the large rolling stones roll down, the wooden pile is moved and clamped in the pilot hole well through the spring A, the large rolling stones are clamped at the pilot hole well mouth against the wooden pile, and the large rolling stones are located at the side of the wooden pile, so that the construction of the plugging prevention structure is realized, and the problem that the existing plugging prevention technology cannot be used for construction due to insufficient construction space for the pilot hole well with a small inner diameter is solved.

Description

Technical Field

[0001] This utility model relates to a blasting-based wellhead plugging construction structure, belonging to the field of vertical shaft wellhead construction technology. Background Technology

[0002] During the excavation of the power station shaft, if the rock strata are too hard to be excavated by engineering machinery, blasting must be carried out first. When blasting is carried out at the top of the shaft, care must be taken to avoid blocking the entrance to the pilot tunnel.

[0003] Existing wellhead anti-clogging technology, as described in Chinese Patent Publication No. CN112412468B, involves constructing a fixed module within the wellbore to provide structural support for the anti-clogging module. However, this technology faces the problem of insufficient construction space for pilot wells with small inner diameters. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a construction structure for preventing wellhead plugging by blasting.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a blasting-resistant wellhead plugging construction structure, comprising:

[0007] The construction structure for creating a plugging structure at the wellhead of the pilot tunnel.

[0008] The construction structure includes: a vertical shaft wall rock layer with a blasting area on the inner side, a guide tunnel at the bottom of the inner side of the vertical shaft wall rock layer, and a flexible steel wire mesh installed on the upper side of the blasting area.

[0009] Explosive charges are installed in the blasting area.

[0010] The bottom of the flexible steel wire mesh is connected to wooden piles via spring A. The wooden piles are installed at the opening of the guide tunnel well with gaps between them, and the top of the wooden piles is higher than the opening of the guide tunnel well.

[0011] The top of the flexible wire mesh is fixedly connected to a cable by a spring member B, and the cable is tied to a counterweight on the top of the rock strata of the shaft wall.

[0012] The beneficial effects of this utility model are as follows: During blasting in the blasting area, the flexible steel wire mesh establishes the first layer of protection against the large rolling stones; when the large rolling stones roll downwards, the wooden piles are adjusted and locked in the guide tunnel well by spring component A, and the large rolling stones are stuck against the wooden piles at the opening of the guide tunnel well. The large rolling stones are located on the side of the wooden piles, thus realizing the construction of the anti-blocking structure and solving the problem that for guide tunnel wells with small inner diameters, there is not enough construction space to carry out the existing anti-blocking technology. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the cross-sectional distribution of this utility model;

[0014] In the diagram: 1-rock strata of the shaft wall; 11-blasting area; 12-explosive body; 2-guide shaft; 3-flexible wire mesh; 31-spring component A; 32-spring component B; 4-wooden pile; 5-cable; 6-counterweight. Detailed Implementation

[0015] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0016] like Figure 1 As shown.

[0017] This application discloses a blasting-based wellhead plugging construction structure, comprising:

[0018] A load-bearing vertical shaft wall rock layer 1 is provided, and there is a blasting zone 11 inside the vertical shaft wall rock layer 1. Explosive explosive 12 is installed in the blasting zone 11.

[0019] There is a guide shaft 2 at the bottom of the inner side of the rock layer 1 of the vertical shaft wall; after the explosive 12 is detonated and the blasting area 11 is blasted, the large rolling stones generated in the blasting area 11 will roll down and block the opening of the guide shaft 2.

[0020] Therefore, a flexible wire mesh 3, also known as a slope protection mesh, is installed on the inner side of the blasting area 11. The flexible wire mesh 3 prevents large boulders from rolling down and blocking the opening of the guide tunnel 2.

[0021] The bottom of the flexible wire mesh 3 is connected to the wooden stakes 4 via spring A31. The wooden stakes 4 are installed at the opening of the guide tunnel 2 with gaps between them. The top of the wooden stakes 4 is higher than the opening of the guide tunnel 2. When a large boulder rolls down to the opening of the guide tunnel 2, the boulder will be stuck against the wooden stakes 4 at the opening of the guide tunnel 2. At this time, the boulder is on the side of the wooden stakes 4, which is convenient for cleaning. During blasting vibration, the wooden stakes 4 are adjusted and stuck in the guide tunnel 2 via spring A31, preventing them from suddenly moving downwards or upwards.

[0022] The top of the flexible wire mesh 3 is fixedly connected to a cable 5 by a spring member B32, and the cable 5 is tied to a counterweight 6 on the top of the rock stratum 1 of the shaft wall.

[0023] When the explosive charge 12 is detonated to blast the blasting area 11, the flexible wire mesh 3 establishes the first line of defense against the large rolling stones. When the large rolling stones roll downwards, the wooden pile 4 is adjusted and locked in the guide tunnel 2 by the spring component A31. The large rolling stones are stuck against the wooden pile 4 at the opening of the guide tunnel 2. The large rolling stones are located on the side of the wooden pile 4, thus realizing the construction of the anti-blocking structure. This solves the problem that for guide tunnels with small inner diameters, there is not enough construction space to carry out the existing anti-blocking technology.

Claims

1. A construction structure for preventing wellhead plugging during blasting, characterized in that, include: The construction structure for the anti-blocking structure is realized at the orifice of the pilot tunnel (2); The construction structure includes: a vertical shaft wall rock layer (1) with a blasting area (11) on the inner side, a guide tunnel (2) at the bottom of the inner side of the vertical shaft wall rock layer (1), and a flexible steel wire mesh (3) installed on the inner side of the blasting area (11). The blasting zone (11) is equipped with explosive charge (12); The bottom of the flexible wire mesh (3) is connected to the wooden pile (4) by the spring A (31). The wooden pile (4) is installed at the opening of the guide tunnel (2) with gaps. The top of the wooden pile (4) is higher than the opening of the guide tunnel (2). The top of the flexible wire mesh (3) is fixedly connected to a cable (5) by a spring member B (32), and the cable (5) is tied to a counterweight (6) on the top of the vertical shaft rock layer (1).

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