Old shaft guniting supporting method

Abstract

The invention discloses an old shaft guniting supporting method, and relates to the technical field of mine shaft supporting. The construction method comprises the following steps: mounting a main well mouth guniting machine and a chute; welding a protective barrier at the top of a main / auxiliary cage of a main well and erecting a protective shed; mounting a seamless steel pipe in a main well shaft; connecting a guniting pipeline; by means of the construction mode, the problems that the mine shaft is old and difficult to support can be solved, the guniting supporting work efficiency and the supporting strength can be improved by erecting the protective railings and the protective sheds and re-planning the positions of the pipelines, production can be normally organized after guniting of each shift of the mine shaft, and the influence on normal production is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mine shaft support, and more specifically to a method for spraying support for old shafts. Background Art

[0002] In mining, the shaft is an important channel connecting the ground and the underground ore body. With the increase of mining depth and the expansion of mining scale, the shaft needs to withstand greater ground pressure, rock stress and other forces. For example, in deep metal mining, the rocks around the shaft may deform and crack due to high stress. Traditional support methods are difficult to meet the requirements of long-term stability. Shotcrete support technology can quickly and effectively reinforce the shaft.

[0003] Some areas of the shaft wall of the mine shaft have been eroded by freeze-thaw for a long time, which has caused the concrete and brickwork of the shaft wall to crack. As a result, the shaft wall peeling and rubble falling frequently occur. During shaft maintenance, the main shaft wall needs to be sealed by grouting. However, there are currently the following problems in the support construction in the old shaft: First, there are many facilities in the old shaft, which makes the support construction difficult; second, there are many facilities, which makes it inconvenient to install wind, water and electricity equipment, and it is difficult to obtain wind, water and electricity in the upper middle section of the old shaft; third, it is difficult to lower materials in the old shaft, and the safety risk of the operation is high. The removal of various facilities will affect the construction efficiency and production efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of difficult wellbore support construction and lack of wind, water and electricity in sections of old wellbores. The present invention provides a method for spraying support of old wellbores with simple process and little impact on production. Except for the spraying time period, production can proceed normally.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical scheme: a method for spraying support of an old wellbore, comprising the following construction steps:

[0006] 1. Installation of the main wellhead shotcrete machine and chute: Conduct on-site survey of the main wellhead site to determine the placement of the shotcrete machine; use steel plates and channel steel to process the chute, and make the chute face the shotcrete and feed port; connect the air and water supply pipelines. If the air and water supply pipelines need to pass through the pipe track, use a protective steel pipe and then lower it through the track;

[0007] 2. Welding guardrails on the top of the main / auxiliary tank cages in the main shaft and setting up protective sheds: Use angle steel to make and process the guardrails on the top of the main and auxiliary tank cages;

[0008] 3. Install seamless steel pipes in the main shaft: Conduct on-site surveys of the equipment installed in the main shaft to determine the installation locations of the shotcrete pipelines and high-pressure water pipes; after on-site surveys and discussions, decide to install the pipelines in the gap between the main and auxiliary cages; when lowering the steel pipes, open the escape cover on the top of the main cage, put the installed pipelines into the cage and tie them up securely; lower the cage to the bottom of the pipelines to be installed, use the tankway beam as a fixed point and use pulleys to lift the pipelines to the installation location, and use flanges to connect the steel pipes; use U-shaped pipe clamps to securely fix the pipelines to the tankway beams; repeat the above operations until the pipelines are installed to the location where shotcrete needs to be installed;

[0009] 4. Connect the spraying pipeline: Use a reducer to connect the spraying hose to the spraying material delivery steel pipe;

[0010] 5. Flushing the well wall: Use a crowbar to inspect the well wall; before spraying, use high-pressure water to clean the well wall. After the construction personnel have finished flushing the well wall, they will notify the construction personnel at the wellhead;

[0011] 6. Feed the shotcrete machine: mix cement, sand, water and inorganic materials evenly according to the proportion; transfer the mixed shotcrete material to the shotcrete chute;

[0012] 7. Carry out the spraying operation: During the spraying operation, the operator stands on the top of the cage and operates from top to bottom;

[0013] Finishing work: After the shotcrete operation is completed, clean the shotcrete machine and shotcrete pipeline, clean the rebound material on the cage, tankway and facilities in the wellbore, remove the shotcrete hose and lift it to the well, clean the rebound material on the top of the cage, and clean the surface construction site.

[0014] Furthermore, the seamless steel pipe described in step three is specifically a φ89 seamless steel pipe.

[0015] Furthermore, the U-shaped pipe clamps in step three are spaced 12 meters apart.

[0016] Furthermore, the sand in step six includes fine aggregate and coarse aggregate, the inorganic material includes an accelerator and a high-performance inorganic material, and the ratio of cement, sand, water, and inorganic material is 1:4.4:0.44:0.0556.

[0017] Furthermore, in step seven, the spraying strength grade is c20, and the spraying thickness is 28mm-32mm.

[0018] Furthermore, the spraying operation in step seven is carried out in sections, and the length of each section should not exceed 20m.

[0019] The beneficial effects of the present invention are as follows: the old shaft spraying support is achieved by installing a spraying machine and a chute at the wellhead of the main shaft, welding protective railings on the top of the main / auxiliary cages of the main shaft and setting up protective sheds, installing seamless steel pipes in the shaft of the main shaft, connecting the spraying pipeline, flushing the shaft wall, feeding the spraying machine, performing spraying operations, and finishing operations. There is no need to dismantle the original facilities, and the support method is simple and durable, thereby solving the problem of old mine shafts and difficult support. By erecting protective railings and protective sheds, re-planning the pipeline position, and setting the spraying ratio, the efficiency and support strength of the spraying support work can be improved, and production can be organized normally after each shift of shaft spraying, reducing the impact on normal production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0022] See also Figure 1 , the present invention provides the following technical solutions:

[0023] (I) Installation of main wellhead shotcrete machine and chute:

[0024] 1. First, conduct an on-site survey of the main wellhead site to determine the location of the shotcrete machine;

[0025] 2. Use steel plates and channel steel to process the chute, and make the chute face the spraying and feeding port;

[0026] 3. Connect the air and water supply pipes. If the air and water supply pipes need to pass through the pipe track, use a protective steel pipe and then lower it through the track.

[0027] (II) Welding guardrails on the top of the main / auxiliary cages in the main shaft and setting up protective sheds:

[0028] 1. Use angle steel to make and process the protective railings on the top of the main and auxiliary tank cages.

[0029] (III) Installation of φ89 seamless steel pipe in the main well

[0030] 1. First, conduct an on-site survey of the equipment installed in the main well shaft to determine the installation location of the shotcrete pipeline and high-pressure water pipe. After on-site survey and discussion, it was decided to install the pipeline in the gap between the main and auxiliary cages;

[0031] 2. When lowering the steel pipe, open the escape cover on the top of the main cage, put the installed pipe into the cage and tie it up securely;

[0032] 3. Lower the cage to the bottom where the pipeline needs to be installed, use the tank beam as a fixed point and use the pulley to lift the pipeline to the installation position, and use flanges to connect the steel pipes;

[0033] 4. Use U-shaped pipe clamps to firmly fix the pipeline and the tank beam, with the U-shaped pipe clamps spaced 12 meters apart;

[0034] 5. Repeat the above steps until the pipeline is installed to the position where spraying is required.

[0035] (IV) Connect the spraying pipeline:

[0036] 1. Use a reducer to connect the shotcrete hose to the φ89 shotcrete delivery steel pipe.

[0037] (V) Flushing the well wall:

[0038] 1. First, use a crowbar to pry the well wall;

[0039] 2. Before spraying, use high-pressure water to clean the well wall. After the construction personnel have finished flushing the well wall, they will notify the construction personnel at the wellhead.

[0040] (VI) Feeding the shotcrete machine:

[0041] 1. Mix cement, sand, water and inorganic materials in proportion and mix them evenly. The sand includes fine aggregate and coarse aggregate. The ratio of fine aggregate to coarse aggregate is 1:1. The inorganic materials include accelerator and high-performance inorganic materials.

[0042] 2. The ratio of cement, sand, water and inorganic materials is 1:4.4:0.44:0.0556;

[0043] 3. Transfer the mixed shotcrete to the shotcrete chute.

[0044] (VII) Carry out spraying operation:

[0045] 1. During spraying, the operator stands on the top of the cage;

[0046] 2. During spraying, the work is carried out from top to bottom;

[0047] 3. The spraying strength grade is c20 and the spraying thickness is required to be 30mm.

[0048] (VIII) Closing work:

[0049] 1. After the spraying operation is completed, clean the spraying machine and spraying pipeline;

[0050] 2. Clean the rebound material on the cage, tankway and facilities in the wellbore;

[0051] 3. Remove the shotcrete hose and then lift it to the well;

[0052] 4. Clean the rebound material on the top of the cage;

[0053] 5. Clean up the surface construction site.

[0054] It should be noted in this embodiment that:

[0055] 1. All workers shall be equipped with and correctly wear labor protection articles such as safety helmets, safety belts, safety shoes, etc. that meet national standards. Safety belts shall be double-rope full-body type;

[0056] 2. Safety guardrails and safety sheds must be installed on the tank top. The height of the safety guardrails shall not be less than 1.2 meters, and the thickness of the safety shed shall not be less than 5 mm;

[0057] 3. Operators should be equipped with walkie-talkies with good signals to communicate with wellhead signals in a timely and effective manner. Two walkie-talkies should be used and one should be spare;

[0058] 4. Before each shift, operators should clear the wellbore and clean the well wall;

[0059] 5. The wellhead operation area is included in the red zone management, and a warning belt is set up within a 10-meter range. Unauthorized personnel are strictly prohibited from entering;

[0060] 6. During the construction process, the safety belt should be fixed at the connection between the wire rope and the tank, and the personnel should stand within the safety fence and under the safety shed throughout the process;

[0061] 7. The spraying operation should be carried out in sections, and the length of each section should not exceed 20 meters to ensure the quality of spraying and construction safety;

[0062] 8. After the shotcreting operation is completed, the construction site should be cleaned up in time and the remaining shotcrete materials and waste should be transported out of the wellbore. The cleaning work should be thorough to avoid leaving any safety hazards.

[0063] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for spraying support of old wellbore, characterized in that: The construction steps include:

1. Installation of the main wellhead shotcrete machine and chute: Conduct on-site survey of the main wellhead site to determine the placement of the shotcrete machine; use steel plates and channel steel to process the chute, and make the chute face the shotcrete and feed port; connect the air and water supply pipelines. If the air and water supply pipelines need to pass through the pipe track, use a protective steel pipe and then lower it through the track; 2. Welding guardrails on the top of the main / auxiliary tank cages in the main shaft and setting up protective sheds: Use angle steel to make and process the guardrails on the top of the main and auxiliary tank cages; 3. Install seamless steel pipes in the main shaft: Conduct on-site surveys of the equipment installed in the main shaft to determine the installation locations of the shotcrete pipelines and high-pressure water pipes; after on-site surveys and discussions, decide to install the pipelines in the gap between the main and auxiliary cages; when lowering the steel pipes, open the escape cover on the top of the main cage, put the installed pipelines into the cage and tie them up securely; lower the cage to the bottom of the pipelines to be installed, use the tankway beam as a fixed point and use pulleys to lift the pipelines to the installation location, and use flanges to connect the steel pipes; use U-shaped pipe clamps to securely fix the pipelines to the tankway beams; repeat the above operations until the pipelines are installed to the location where shotcrete needs to be installed; 4. Connect the spraying pipeline: Use a reducer to connect the spraying hose to the spraying material delivery steel pipe; 5. Flushing the well wall: Use a crowbar to inspect the well wall; before spraying, use high-pressure water to clean the well wall. After the construction personnel have finished flushing the well wall, they will notify the construction personnel at the wellhead; 6. Feed the shotcrete machine: mix cement, sand, water and inorganic materials evenly according to the proportion; transfer the mixed shotcrete material to the shotcrete chute; 7. Carry out the spraying operation: During the spraying operation, the operator stands on the top of the cage and operates from top to bottom; 8. Finishing work: After the shotcrete operation is completed, clean the shotcrete machine and shotcrete pipeline, clean the rebound material on the cage, tankway and facilities in the wellbore, remove the shotcrete hose and lift it to the well, clean the rebound material on the top of the cage, and clean the surface construction site.

2. The old wellbore shotcrete support method according to claim 1, characterized in that: The seamless steel pipe described in step three is specifically a φ89 seamless steel pipe.

3. The old wellbore shotcrete support method according to claim 1 is characterized in that: The U-shaped pipe clamps described in step 3 are spaced 12 meters apart.

4. The old wellbore shotcrete support method according to claim 1, characterized in that: The sand in step six includes fine aggregate and coarse aggregate, the inorganic material includes an accelerator and a high-performance inorganic material, and the ratio of cement, sand, water, and inorganic material is 1:4.4:0.44:0.0556.

5. The old wellbore shotcrete support method according to claim 1 is characterized in that: In step seven, the spraying strength grade is c20 and the spraying thickness is 28mm-32mm.

6. The old wellbore shotcrete support method according to claim 1, characterized in that: In step seven, the spraying operation is carried out in sections, and the length of each section should not exceed 20m.

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