A method for installing a downhole filling pipe

Abstract

The present invention relates to an underground filling pipe installation method, which belongs to the field of mining construction technology. This technical solution constructs a filling borehole through a raise boring machine, and then installs multiple filling pipes in the filling borehole, and connects the filling pipeline system of the upper middle section with the filling pipeline system of the lower middle section through the filling pipe, shortening the pipeline length of the filling system and reducing the filling line. The filling paste and the filling pipe form a whole fixed in the surrounding rock, avoiding the swing of the filling pipe during the filling process. The filling pipe is isolated from the air, which slows down the rust of the filling pipe and extends the service life of the filling pipe. By installing multiple filling pipes, as long as there is a filling pipe connected to the lower filling system, the pipeline connection of the upper and lower filling systems can be realized, avoiding the paralysis of the filling system due to the blockage of the filling pipe, resulting in the inability to fill the mining field, and effectively increasing the stability of the operation of the filling pipeline system.

Description

Technical Field

[0001] The invention belongs to the technical field of mining construction, and in particular relates to an underground filling pipe installation method. Background Art

[0002] In backfill mining, the backfill pipe system, as the delivery system for the backfill paste, is crucial for operational stability. The current installation procedure for the backfill pipe connecting the upper and middle mining areas involves using a drill to create a backfill borehole, inserting the backfill pipe into the borehole, and finally connecting the backfill pipe network in the upper and middle mining areas to the backfill pipe network in the lower and middle mining areas, respectively. Due to the gap between the backfill pipe and the borehole, the backfill pipe is susceptible to corrosion and damage, resulting in a short service life. Furthermore, the single backfill pipe design, if blocked, will inevitably paralyze the backfill system, preventing backfilling in the mine and causing unstable operation. Summary of the Invention

[0003] In order to solve the above problems, the present invention proposes a method for installing a downhole filling pipe, which effectively increases the stability of the filling pipe system.

[0004] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0005] A method for installing a downhole filling pipe comprises the following steps:

[0006] S1: In the upper middle section, select a place with intact rock structure and good stability to construct the raise drilling joint 2, and construct the raise drilling chamber 4 at the end of the raise drilling joint 2; in the lower middle section, select a place with intact rock structure and good stability to construct the filling joint 3;

[0007] S2: Using a surveying theodolite, a pilot hole is drilled in the upper middle section raise-bored chamber 4 to connect the lower middle section filling channel 3. The pilot hole is connected to the upper and lower middle sections through raise-boring, and then expanded to form a filling borehole with a diameter of 2m.

[0008] S3: Install a fixed electric hoist in the upper middle section raise boring chamber 4, pull the filling pipe 1 with the electric hoist, and gradually put it into the filling borehole until the filling pipe 1 connects the entire filling borehole;

[0009] S4: The filling pipe 1 in the upper middle section raise boring chamber 4 is connected to the filling pipe 1 network system directly connected to the surface at the upper part through the raise boring tunnel 2 and the filling pipe 1 in the upper middle section tunnel, and is controlled by a gate valve;

[0010] S5: The filling pipe 1 in the lower middle section filling joint 3 is connected to the filling pipe 1 network system directly connected to the stope at the lower part through the filling joint 3 and the filling pipe 1 in the lower middle section roadway, and is controlled by a gate valve;

[0011] S6: Repeat steps S3 to S5 to install at least two filling pipes 1 in the filling borehole;

[0012] S7: Build a closed partition wall in the lower middle section filling channel 3. After the partition wall solidifies, connect the filling pipe 1 from the upper middle section reverse drilling chamber 4, open the gate valve of the filling pipe 1, connect to the surface filling preparation station to make paste, and fill the paste into the filling borehole through the upper filling system pipeline network until the gap between the filling pipe 1 and the filling borehole side wall is filled, and fix the filling pipe 1 in the paste.

[0013] Preferably, in step S2, the length of the raise-drilled tunnel 2 is 8 to 20 m, and the cross section is a three-center arch of 3 m×3 m.

[0014] Preferably, in step S2, the raise-bored chamber 4 is constructed by drilling and blasting to form a cube with a width of 4 m, a length of 6 m, and a height of 5.2 m.

[0015] Preferably, in step S7, the ingredients of the paste include water, tailings, cement, and flocculant.

[0016] Preferably, in step 3, the inner diameter of the filling tube 1 is 150 mm.

[0017] Beneficial effects of the present invention:

[0018] This technical solution uses a raise boring machine to construct a filling borehole, and then installs multiple filling pipes in the filling borehole. The filling pipe system in the upper middle section is connected to the filling pipe system in the lower middle section through the filling pipe, shortening the length of the filling system pipeline and reducing the filling line. The filling paste and the filling pipe form a whole and are fixed in the surrounding rock, avoiding the swing of the filling pipe during the filling process. The filling pipe is isolated from the air, which slows down the rust of the filling pipe and extends the service life of the filling pipe. By installing multiple filling pipes, as long as there is a filling pipe connected to the lower filling system, the upper and lower area filling system pipelines can be connected, avoiding the paralysis of the filling system due to the blockage of the filling pipe, resulting in the inability to fill the stope, and effectively increasing the stability of the filling pipe system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the installation of the filling tube of the present invention.

[0021] In the figure, 1-filling pipe, 2-raised well drilling channel, 3-filling channel, 4-raised well drilling chamber, 5-partition cavity. Implementation Method

[0022] In order to make the objectives, technical solutions and beneficial effects of the present invention more clear, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding by technicians.

[0023] Specific embodiments, such as Figure 1 As shown, in the upper middle mining area, a place with complete rock structure and good stability is selected to construct the reverse drilling joint 2. The reverse drilling joint 2 can be constructed into a length of 8 to 20 meters according to the on-site time conditions, and the cross-section is constructed as a 3m×3m three-center arch; the reverse drilling chamber 4 is constructed at the end of the filling joint 3. The raise boring chamber 4 is constructed by drilling and blasting to form a cube with a width of 4m, a length of 6m and a height of 5.2m. In the lower middle section, a filling joint 3 is constructed at a place with complete rock structure and good stability. The length of the filling joint 3 is generally 3 to 10m, and the cross section is a 3m×3m three-center arch. A measuring theodolite is used to lay out the position of the pilot hole connecting the lower middle section filling joint 3 in the upper middle section raise boring chamber 4. After the raise boring construction pilot hole connects the upper and lower middle sections, it is expanded to form a filling borehole with a diameter of 2m. After the filling borehole is formed, a fixed electric hoist is installed in the upper middle section raise boring chamber 4, and the filling pipe 1 (inner diameter 150mm) is pulled by the hoist, connected one by one, and gradually placed into the filling borehole until the connection length of the filling pipe 1 is sufficient to connect the entire filling borehole. The filling pipe 1 in the upper middle section raise boring chamber 4 is drilled through the raise boring The filling pipe 1 is installed in the link 2 and the upper middle section of the roadway, and is connected to the filling pipe 1 network system directly connected to the surface at the top, and is controlled by a gate valve; the filling pipe 1 in the lower middle section filling link 3 is connected to the filling pipe 1 network system directly connected to the stope at the bottom through the filling link 3 and the lower middle section of the roadway, and is controlled by a gate valve; 2 to 4 filling pipes 1 can be installed as needed in the filling borehole according to steps S3 to S5; a closed partition wall is built in the lower middle section filling link 3, and after the partition wall solidifies, the filling pipe 1 is connected from the upper middle section reverse drilling chamber 4, the gate valve of the filling pipe 1 is opened to contact the surface filling preparation station to make a paste (including water, tailings, cement, flocculant, etc.), and the paste is filled into the filling borehole through the upper filling system pipeline network until the gap between the filling pipe 1 and the side wall of the filling borehole is filled, so that the filling pipe 1 is fixed in the paste.

[0024] This technical solution uses a raise boring machine to construct a filling borehole, installs multiple filling pipes 1 in the filling borehole, and connects the filling pipe 1 system of the upper middle section with the filling pipe 1 system of the lower middle section through the filling pipe 1, shortening the length of the filling system pipeline and reducing the filling line. The filling paste and the filling pipe 1 form a whole fixed in the surrounding rock, avoiding the swing of the filling pipe 1 during the filling process. The filling pipe 1 is isolated from the air, which slows down the rust of the filling pipe 1 and extends the service life of the filling pipe 1. Before the invention is used, the diameter of the filling borehole is only 30 to 40 cm. Only one filling pipe 1 can be installed in the filling borehole, and the risk of pipe blockage is relatively high. The invention can install 2 to 4 filling pipes 1 in the filling borehole. As long as there is a filling pipe 1 connected to the lower filling system, the upper and lower area filling system pipelines can be connected, avoiding the filling system paralysis caused by the blockage of the filling pipe 1, resulting in the inability to fill the mining area, and effectively increasing the stability of the operation of the filling pipe 1 system.

[0025] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A method for installing a downhole filling pipe, characterized in that: The specific steps include: S1: In the upper middle section, select the place with intact rock structure and good stability to construct the raise drilling joint, and construct the raise drilling chamber at the end of the raise drilling joint; in the lower middle section, select the place with intact rock structure and good stability to construct the filling joint; S2: Use a surveying theodolite to lay out the pilot hole position for connecting the filling channel of the lower middle section in the upper middle section raise boring chamber. After raise boring, the pilot hole connects the upper and lower middle sections and then expands to form a filling borehole with a diameter of 2m. S3: Install a fixed electric hoist in the upper middle section of the raise boring chamber, pull the filling pipe with the electric hoist, and gradually put it into the filling borehole until the filling pipe connects the entire filling borehole; S4: The filling pipes in the upper middle section raise boring chamber are connected to the filling pipe network system directly connected to the surface through the raise boring tunnel and the filling pipes in the upper middle section tunnel, and are controlled by gate valves; S5: The filling pipe in the lower middle section filling joint is connected to the filling pipe network system directly connected to the stope at the bottom through the filling joint and the filling pipe in the lower middle section roadway, and is controlled by a gate valve; S6: Repeat steps S3 to S5 to install at least two filling pipes in the filling borehole; S7: Construct a sealed partition wall in the lower middle section filling channel. After the partition wall solidifies, connect the filling pipe from the upper middle section raise boring chamber, open the filling pipe gate valve, contact the surface filling preparation station to make paste, and fill the paste into the filling borehole through the upper filling system pipe network until the gap between the filling pipe and the filling borehole sidewall is filled, and fix the filling pipe in the paste; In step S2, the length of the raise drilling track is 8 to 20 m, and the cross section is a three-center arch of 3 m × 3 m; In step S2, the raise-bored chamber is constructed by drilling and blasting to form a cube with a width of 4 m, a length of 6 m, and a height of 5.2 m.

2. A method for installing a downhole filling pipe according to claim 1, characterized in that: In step S7, the paste comprises water, tailings, cement, and flocculant.

3. A method for installing a downhole filling pipe according to claim 2, characterized in that: In step 3, the inner diameter of the filling tube is 150 mm.

Images