Deep hole bottom double-liquid mixed grouting device convenient to recycle

Abstract

A deep hole bottom double-liquid mixed grouting device convenient to recycle comprises a bag type hole packer, the bag type hole packer comprises a bag body and plugs arranged at the two ends of the bag body, a grouting pipe penetrating out of the plugs is arranged in the middle of the bag body, the upper portion of the grouting pipe is connected with a bearing steel wire rope, and an upper end opening of the grouting pipe is connected with a two-in-one-out three-way connector. The upper port is communicated with a liquid outlet of a two-inlet and one-outlet three-way joint, and two liquid inlets of the two-inlet and one-outlet three-way joint are respectively connected with a first slurry pipeline and a second slurry pipeline which are arranged in parallel; a medium inlet of the bag body is communicated with external high-pressure water injection equipment through a three-way pipe fitting, the high-pressure water injection equipment is communicated with an inlet of the three-way pipe fitting through a high-pressure thin pipe, a medium outlet is communicated with an outlet of the three-way pipe fitting, and another outlet of the three-way pipe fitting is a discharge outlet capable of being opened and closed. According to the utility model, cement paste and water glass are mixed at a specified depth at the bottom of the hole; the in-hole grouting pipeline, the traction steel wire rope, the load-bearing steel wire rope and the like can be lifted and recycled after grouting is completed, and repeated utilization is achieved.

Description

Technical Field

[0001] This utility model relates to the field of borehole grouting technology, specifically a deep hole bottom dual-liquid mixing grouting device that is easy to recover. Background Technology

[0002] In mining operations, deep boreholes are often required for grouting, such as curtain grouting holes in mines, where depths can exceed 100 meters. For grout materials, cement grout and water glass dual-liquid grouting are typically used to achieve rapid underwater solidification, reduce grout loss, and facilitate quick sealing. Most existing dual-liquid grouting technologies employ a two-liquid mixing process at the borehole opening, with less emphasis on deep two-liquid mixing at the bottom of the borehole.

[0003] While the orifice mixing process for two-component grouts offers the advantage of ease of operation, the mixing of the two grouts at the orifice and subsequent solidification and hardening during transport to deeper parts of the borehole due to the reaction often leads to pipe or borehole blockage. This not only prevents the grout from being injected into the target layer at greater depths for extended periods but also renders the borehole or pipeline unusable, resulting in grouting failure. For deep bottom mixing of two-component grouts, existing technologies cannot adequately balance the two key technical functions of mixing and sealing the borehole, and lack methods for pipeline recycling. For example, patent CN106894414B, entitled "Precise Mixing Construction Process and Grouting Structure for Deep Bottom Mixing of Two-Compound Grouts," includes cement grout conduits and quick-setting grout conduits, as well as steel sleeves and sleeve caps for fixing the two conduits. Although the cement grout and water glass are mixed at the bottom of the pipes in this grouting structure, uneven mixing occurs, and the pipelines cannot be recycled for reuse. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a deep hole bottom dual-liquid mixing grouting device that is easy to recycle.

[0005] The technical solution of this utility model is as follows:

[0006] A deep hole bottom dual-liquid mixing grouting device that is easy to recycle includes a bladder-type sealing device. The bladder-type sealing device includes a bladder body and plugs disposed at both ends of the bladder body. The bladder body has a grouting pipe that passes through the plugs in the middle. A load-bearing steel wire rope is connected to the upper part of the grouting pipe, and a two-inlet-one-outlet tee connector is connected to the upper port of the grouting pipe. The outlet of the two-inlet-one-outlet tee connector is connected to the upper port through an outlet pipe. The two inlets of the two-inlet-one-outlet tee connector are respectively connected to a first grout pipeline and a second grout pipeline arranged in parallel. The outlet pipe is arranged in parallel with the first grout pipeline.

[0007] The bladder body has a medium inlet located on the plug. The medium inlet is connected to an external high-pressure water injection device through a tee fitting. The high-pressure water injection device is connected to the inlet of the tee fitting through a high-pressure thin tube. The medium outlet is connected to one of the outlets of the tee fitting. The other outlet of the tee fitting is a drain outlet that can be opened and closed.

[0008] The deep boreholes used in mining are quite deep. To ensure that the first and second slurry pipelines have sufficient length, the first slurry pipeline is composed of multiple detachable straight pipe sections. The second slurry pipeline has the same structure as the first slurry pipeline, and the multiple detachable straight pipe sections also facilitate disassembly and transportation.

[0009] The above-mentioned discharge outlet has a structure that enables it to open and close. The discharge outlet is equipped with a waterproof electric valve. The bladder-type sealing device is located at a designated position below the bottom of the deep hole. Its body expands and contacts the wall of the deep hole to seal the hole. After grouting is completed, the first grout pipeline, the second grout pipeline, and the bladder-type sealing device need to be removed upwards. The waterproof electric valve is opened by the controller on the upper outer side of the deep hole. The high-pressure water inside the bladder body flows out from the discharge outlet, so that the bladder body is separated from the inner wall of the deep hole, making it easy to remove the grouting device.

[0010] Because the high-pressure capillary tube is filled with water, to prevent pressure release at the borehole opening from hindering proper depressurization of the bladder-type sealing device at the bottom of the borehole, and thus preventing the bladder-type sealing device from becoming unremovable, this invention features a manual valve at the discharge outlet. The manual valve includes a handle, with a traction steel wire rope fixedly connected to the outer end of the handle. The handle can be perpendicular to the axis of the grouting pipe when the manual valve is normally closed. After grouting is completed, the traction steel wire rope can be pulled at the top of the deep hole to change the handle position, opening the discharge outlet. The high-pressure water inside the bladder flows outward along the discharge outlet, allowing the grouting device to be removed.

[0011] To facilitate the stable installation of the tee fitting on the upper part of the bladder-type sealing device, a mounting bracket is provided on one side of the grouting pipe above the tee fitting. The mounting bracket includes two parallel through mounting holes. The upper part of the tee fitting is connected to one through mounting hole, and the traction steel wire rope is threaded through the other through mounting hole located on the outer side.

[0012] To facilitate the upward rotation of the outer end of the handle by a certain angle when the traction wire rope is pulled up, thereby opening the discharge outlet, the connection between the handle and the traction wire rope is offset from another through mounting hole.

[0013] Another way to release the high-pressure water inside the grouting tube is to install a small waterproof electric push rod on the upper part of the grouting pipe away from the mounting bracket. The extended end of the small waterproof electric push rod is set vertically downward and connected to a piercing tip that can pierce the upper part of the grouting tube. By controlling the small waterproof electric push rod, the piercing tip is moved down to the grouting tube and pierced, so that the grouting tube is separated from the inner wall of the deep hole, making it easier to remove the grouting device. It can also be used in conjunction with the drain outlet to further discharge the water inside the grouting tube.

[0014] The beneficial effects of this utility model are as follows:

[0015] The first grout pipeline can transport cement grout, and the second grout pipeline can transport water glass. The cement grout and water glass can be pre-mixed at the contact point of the two-in-one-out tee joint. Before mixing, the cement grout and water glass pipelines are completely independent and run their own routes. The pipelines are the same size and specifications, and can achieve high-pressure and high-flow grouting of several megapascals. They can also be controlled independently and the mixing ratio is flexible. A bladder-type hole sealer is used to stop the grouting and seal the hole. The two-liquid pipelines can overcome the narrow hole diameter conditions of the drilled hole through the two-in-one-out tee joint to realize pipeline installation.

[0016] The "parallel tee" structure of the two-in-one-out tee connector connects to the grouting pipe at the top of the bladder-type sealing device via threaded connection, achieving four key technical challenges: First, the cement grout and water glass are mixed at a specified depth at the bottom of the hole; second, the bottom sealing must achieve the desired sealing effect, preventing air or grout leakage due to insufficient sealing pressure, which could prevent further grout injection; third, the bladder-type sealing device can move up and down at the bottom of the borehole for sealing, enabling multi-stage, layered grouting; and fourth, the grouting pipes, traction wire ropes, and load-bearing wire ropes inside the hole can all be lifted and retrieved after grouting is completed, allowing for repeated use.

[0017] The bladder-type sealing device, load-bearing steel wire rope, two-in-one-out tee connector, tee fitting, small waterproof electric push rod, and the first and second grout pipelines in sections are assembled as a whole. The installation, lowering, grouting construction, and recovery after grouting are all simple to operate. During lowering, the load-bearing steel wire rope is lifted by the drilling rig head to assist in the load-bearing. The first and second grout pipelines are installed section by section by manpower. The sections can be connected by threads, which has a good sealing effect. The sections are lowered one by one to the predetermined target grouting layer at the bottom of the deep hole. Water or air is used to seal the bladder-type sealing device to the borehole wall, and then grouting begins.

[0018] It enables grouting during installation, avoiding the drawbacks of grout sealing causing solidification waiting time and the inability to recycle pipelines, thus achieving green construction. Attached Figure Description

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the structure of Example 1;

[0021] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of Example 3;

[0023] Figure 4 for Figure 3 Partial front view;

[0024] Figure 5 A cross-sectional view of the grouting device installed in a deep hole;

[0025] The components represented by the various reference numerals in the diagram are:

[0026] 1. Bag-type sealing device; 101. Bag body; 102. Plug; 103. Medium inlet; 104. Grouting pipe; 2. Load-bearing steel wire rope; 3. Two-in-one-out T-connector; 301. Liquid outlet; 302. Liquid inlet; 4. First grout pipeline; 5. Second grout pipeline; 6. T-fitting; 601. Inlet; 602. Drain outlet; 7. High-pressure thin tube; 8. Manual valve; 801. Handle; 9. Traction steel wire rope; 10. Mounting bracket; 1001. Through mounting hole; 11. Small waterproof electric push rod; 12. Piercing tip. Detailed Implementation

[0027] Example 1:

[0028] See Figure 1 and Figure 2 As shown, a deep hole bottom dual-liquid mixing grouting device that is easy to recycle includes a bladder-type sealing device 1. The bladder-type sealing device 1 includes a bladder body 101 and plugs 102 disposed at both ends of the bladder body 101. In the figure, the bladder body 101 is in an expanded state. The middle of the bladder body 101 has a grouting pipe 104 that passes through the plugs 102. The upper part of the grouting pipe 104 is connected to a load-bearing steel wire rope 2, and the upper port of the grouting pipe 104 is connected to a two-inlet-one-outlet tee connector 3. The upper port is connected to the outlet 301 of the two-inlet-one-outlet tee connector 3 through an outlet pipe. The two inlets 302 of the two-inlet-one-outlet tee connector 3 are respectively connected to a first grout pipeline 4 and a second grout pipeline 5 arranged in parallel, and the outlet pipes are respectively arranged in parallel with the first grout pipeline 4 and the second grout pipeline 5.

[0029] The bladder body 101 has a medium inlet 103 provided on the plug 102. The medium inlet 103 is connected to an external high-pressure water injection device through a three-way fitting 6. The high-pressure water injection device is connected to the inlet 601 of the three-way fitting 6 through a high-pressure thin tube 7. The medium outlet is connected to one of the outlets of the three-way fitting 6. The other outlet of the three-way fitting 6 is a drain outlet 602 that can be opened and closed.

[0030] The deep boreholes used in mining are quite deep. To ensure that the first slurry pipeline 4 and the second slurry pipeline 5 have sufficient length, the first slurry pipeline 4 is composed of multiple detachable straight pipe sections. The straight pipe sections are interlocked and threaded together, and can be assembled to any length according to the depth of the deep hole. The second slurry pipeline 5 has the same structure as the first slurry pipeline 4, and the multiple detachable straight pipe sections also facilitate disassembly and transportation.

[0031] In this embodiment, the discharge outlet 602 is designed to open and close in the following way: the discharge outlet 602 is equipped with a manual valve 8, which includes a handle 801. A traction steel wire rope 9 is fixedly connected to the outer end of the handle 801, and the handle 801 can be perpendicular to the axis of the grouting pipe 104 when the manual valve 8 is normally closed. When the bladder-type sealing device 1 is lowered to the designated position at the bottom of the deep hole, one end of the traction steel wire rope 9 is located outside the upper end of the deep hole for easy pulling. After grouting is completed, the traction steel wire rope 9 can be pulled at the top of the deep hole to change the position of the handle 801, pulling the horizontal handle 801 upward to a vertical position, thereby opening the discharge outlet 602. The high-pressure water inside the bladder body 101 flows outward along the discharge outlet 602, facilitating the removal of the grouting device.

[0032] To facilitate the stable installation of the tee fitting 6 on the upper part of the bladder-type sealing device 1, a mounting bracket 10 is provided on one side of the grouting pipe 104 above the tee fitting 6. The mounting bracket 10 includes two parallel through mounting holes 1001. The upper part of the tee fitting 6 is connected to one through mounting hole 1001, and the traction steel wire rope 9 is passed through the other through mounting hole 1001 located on the outer side. The inner diameter of the through traction hole is larger than the outer diameter of the traction steel wire rope 9 and the high-pressure thin tube 7, respectively. The lower part of the high-pressure thin tube 7, which is connected to the upper part of the tee fitting 6, can be located in one through mounting hole 1001 to achieve the guiding and storage function.

[0033] To facilitate the upward rotation of the outer end of the handle 801 by a certain angle when the traction wire rope 9 is pulled up, thereby opening the discharge outlet 602, the connection between the handle 801 and the traction wire rope 9 is offset from another through mounting hole 1001. The vertical plane containing the axis of the other through mounting hole 1001 is in the same plane as the vertical plane containing the axis of the rotating shaft corresponding to the rotation of the handle 801. This allows the connection between the traction wire rope 9 and the outer end of the handle 801 to be inclinedly inserted into the through mounting hole 1001, making it easier to pull the handle 801.

[0034] When the bladder-type sealing device 1 is lowered into the deep hole, two grouting steel pipes are installed section by section. The high-pressure thin pipe 7, the pulling steel wire rope, the load-bearing steel wire rope 2, the first grout pipeline 4 and the second grout pipeline 5 all extend to the hole opening. During the lowering process of the bladder-type sealing device 1, the first grout pipeline 4 and the second grout pipeline 5, the load-bearing steel wire rope 2 is pulled with the assistance of the power table of the drilling rig. The grouting steel pipes are installed section by section by manpower, and the power table of the drilling rig is operated for lowering and installation.

[0035] The bladder-type sealing device 1 seals the hole by pumping water or air into the hole through a high-pressure thin tube 7 at the hole opening. The outer bladder of the bladder-type sealing device 1 expands and makes tight contact with the borehole wall to achieve sealing.

[0036] Cement grout and water glass enter the borehole through parallel first grout pipe 4 and second grout pipe 5, respectively. They are mixed through a two-in-one-out tee joint 3 and injected into the target layer at the bottom of the borehole through the grouting pipe 104 of the bladder-type sealing device 1. In this way, the two liquids are independent for the hundreds of meters of borehole depth, and they are only mixed at the bottom of the borehole. This avoids the disadvantages of pipe blockage, borehole blockage, borehole failure and grouting failure caused by mixing of two liquids at the borehole opening in the existing technology. The pipelines for the two liquid grouting are of the same size and specifications, which can ensure high flow rate grouting. The mixing ratio of the two liquids can be achieved above the borehole opening, which is more flexible.

[0037] After grouting is completed, the bladder sealer 1, the first grout line 4, the second grout line 5, and the grouting pipe 104 are retrieved. After grouting is completed, the hole is flushed with water. The manual valve 8 at the bottom of the deep hole can be opened remotely by pulling the steel wire rope to quickly depressurize the bladder sealer 1 and eliminate its seal with the hole wall, making it easy to pull up and retrieve the bladder sealer 1 and the grouting pipe 104.

[0038] Example 2:

[0039] The difference between Embodiment 2 and Embodiment 1 lies in the different opening and closing structures of the discharge outlet 602. In Embodiment 2, the discharge outlet 602 is equipped with a waterproof electric valve. The bladder-type sealing device 1 extends to a designated position at the bottom of the deep hole, and its bladder body 101 expands and contacts the wall of the deep hole to seal the hole. After grouting is completed, the first grout pipeline 4, the second grout pipeline 5, and the bladder-type sealing device 1 need to be removed upwards. By controlling the opening of the waterproof electric valve, the high-pressure water inside the bladder body 101 flows out from the discharge outlet 602, so that the bladder body 101 is separated from the inner wall of the deep hole, making it easy to remove the grouting device.

[0040] Example 3:

[0041] See Figure 3 , Figure 4 and Figure 5As shown, the difference between Embodiment 3 and Embodiments 2 and 1 lies in the method of releasing the high-pressure water from the bladder body 101. A small waterproof electric push rod 11 is provided on the upper part of the grouting pipe 104 away from the mounting bracket 10. The extended end of the small waterproof electric push rod 11 is set vertically downward, and the extended end is connected to a piercing tip 12 that can pierce the upper part of the bladder body 101. The piercing tip 12 is a rod structure. By controlling the small waterproof electric push rod 11, the piercing tip 12 is moved down to the bladder body 101, piercing the bladder body 101, so that the bladder body 101 is separated from the inner wall of the deep hole, making it easier to remove the grouting device. It can also be used in conjunction with the drain outlet 602 of Embodiment 1 or Embodiment 2 to further drain the water in the bladder body 101.

[0042] It should be noted that after grouting is completed, the bladder body must be immediately depressurized to detach from the borehole wall before the bladder sealer, grouting pipeline, and other equipment can be retrieved. Successful depressurization directly determines whether the bladder body can successfully detach from the borehole wall and the grouting pipeline can be successfully retrieved. When high-pressure water is used as the medium in the bladder sealer, the bladder body is filled with water, resulting in a better sealing effect than high-pressure air. However, because the high-pressure capillary tube is full of water, when the borehole depth is large, simply releasing pressure through the capillary tube at the borehole opening is insufficient to effectively depressurize the bladder body at the bottom of the borehole. Therefore, depressurization needs to be performed at a close distance to the bladder sealer, or the bladder body itself needs to be directly damaged for depressurization. Thus, this invention designs two remote depressurization devices. The first remote pressure relief device is a tee fitting installed on the upper part of the bladder-type sealing device. This tee fitting has a drainage outlet, for which two remote operation methods are designed: one is a waterproof electric valve installed at the drainage outlet, which is operated by a pre-installed wire to the deep hole opening; the other is a manual valve handle connected to a traction steel wire rope to the deep hole opening, allowing remote pressure relief by pulling the handle. The second remote pressure relief device is a small waterproof electric actuator installed above the grouting pipe on the upper part of the bladder-type sealing device. This actuator is operated by a pre-installed wire to the deep hole opening, allowing the piercing tip of the small waterproof electric actuator to pierce the bladder body. These two remote pressure relief devices ensure effective pressure relief of the bladder-type sealing device.

Claims

1. A deep-hole bottom dual-liquid mixing grouting device for easy recycling, comprising a bladder-type sealing device (1), wherein the bladder-type sealing device (1) comprises a bladder body (101) and plugs (102) disposed at both ends of the bladder body (101), and the bladder body (101) has a grouting pipe (104) extending through the plugs (102) in the middle, characterized in that, The upper part of the grouting pipe (104) is connected to a load-bearing steel wire rope (2), and the upper port of the grouting pipe (104) is connected to a two-in-one-out three-way connector (3). The outlet (301) of the two-in-one-out three-way connector (3) is connected to the upper port through the outlet pipe. The two inlets (302) of the two-in-one-out three-way connector (3) are respectively connected to a first grout pipeline (4) and a second grout pipeline (5) arranged in parallel, and the outlet pipe is arranged in parallel with the first grout pipeline (4). The bladder body (101) has a medium inlet (103) provided on the plug (102). The medium inlet (103) is connected to an external high-pressure water injection device through a three-way fitting (6). The high-pressure water injection device is connected to the inlet (601) of the three-way fitting (6) through a high-pressure thin tube (7). The medium outlet is connected to one of the outlets of the three-way fitting (6). The other outlet of the three-way fitting (6) is a drain outlet (602) that can be opened and closed.

2. The deep-hole bottom dual-liquid mixing grouting device for easy recycling according to claim 1, characterized in that, The first slurry pipeline (4) is composed of multiple detachable straight pipe sections, and the second slurry pipeline (5) has the same structure as the first slurry pipeline (4).

3. The deep-hole bottom dual-liquid mixing grouting device for easy recycling according to claim 1, characterized in that, The discharge outlet (602) is equipped with a waterproof electric valve.

4. The deep-hole bottom dual-liquid mixing grouting device for easy recycling according to claim 1, characterized in that, The discharge outlet (602) is equipped with a manual valve (8), which includes a handle (801). A traction steel wire rope (9) is fixedly connected to the outer end of the handle (801), and the handle (801) can be perpendicular to the axis of the grouting pipe (104) when the manual valve (8) is normally closed.

5. A deep-hole bottom dual-liquid mixing grouting device for easy recycling according to claim 4, characterized in that, The grouting pipe (104) is provided with a mounting bracket (10) above the tee fitting (6) on one side. The mounting bracket (10) includes two parallel through mounting holes (1001). The upper part of the tee fitting (6) is connected to one through mounting hole (1001), and the traction wire rope (9) is threaded through the other through mounting hole (1001) located on the outside.

6. A deep-hole bottom dual-liquid mixing grouting device for easy recycling according to claim 5, characterized in that, The connection between the handle (801) and the traction wire rope (9) is offset from another through mounting hole (1001).

7. A deep-hole bottom dual-liquid mixing grouting device for easy recycling according to claim 1, characterized in that, The upper part of the grouting pipe (104) is provided with a small waterproof electric push rod (11) on the side away from the mounting bracket (10). The extended end of the small waterproof electric push rod (11) is set vertically downward, and the extended end is connected to a piercing tip (12) that can pierce the upper part of the bladder body (101).

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