Monitoring instrument borehole grouting device

Abstract

The monitoring instrument drilling hole grouting device relates to the safety monitoring field.The monitoring instrument drilling hole grouting device comprises a main steel cylinder, a drain pipe, an exhaust pipe, a pressure gauge, a main grouting pipe, a supplementary grouting pipe, a hole grouting pipe, a hole exhaust pipe, a flange plate, a pre-buried steel pipe and a displacement measurement assembly.The pre-buried steel pipe is pre-buried at the hole mouth of the drilling hole, and the main steel cylinder is connected with the pre-buried steel pipe through the flange plate.The main grouting pipe and the supplementary grouting pipe are both installed at the end of the main steel cylinder and are in communication with the inside of the main steel cylinder.The drain pipe is arranged at the lower part of the main steel cylinder.The exhaust pipe is arranged at the upper part of the main steel cylinder.The hole grouting pipe, the hole exhaust pipe and the displacement measurement assembly are all installed in the main steel cylinder and the pre-buried steel pipe.The hole grouting pipe is connected with the main grouting pipe or the supplementary grouting pipe of the main steel cylinder, and the hole exhaust pipe is connected with the exhaust pipe of the main steel cylinder.The present application can realize the one-time completion of grouting, drainage and leakage stopping under the geological condition of abundant underground water, and has the characteristics of labor saving, rapidness, reliability and convenience.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring, and in particular to a borehole grouting device for monitoring instruments used after the installation of a multi-point displacement gauge in a borehole. Background Technology

[0002] Multi-point displacement gauges are the primary monitoring instruments for slope and underground cavern deformation and are widely used in engineering. The process involves drilling a borehole within the rock mass and installing a displacement measurement assembly inside. Multiple anchor points are installed at different depths within the borehole. A measuring rod (with a PVC protective sleeve) connects the anchor points. The measuring rod is then led to the borehole opening and connected to a displacement sensor, which is fixed within a dedicated probe support. After the displacement measurement assembly is installed, the borehole must be backfilled with grout. The grout must be dense to ensure that the anchor points deform synchronously with the surrounding rock mass.

[0003] In engineering projects, situations often arise where groundwater is abundant in the rock mass, with groundwater continuously gushing from the borehole. Direct grouting in such cases often results in incomplete grouting and weak connection between the anchor points and the rock mass, causing displacement sensors to fail to accurately reflect the rock mass deformation. The usual approach in engineering is to first plug the leak, blocking the groundwater, before installing the displacement measurement components and grouting. However, this approach significantly increases the workload, often requiring repeated treatments over several days, and the results are not always ideal. Summary of the Invention

[0004] The present invention addresses the problem that in rock masses rich in groundwater, direct grouting in boreholes results in incomplete grouting, causing displacement sensors to fail to accurately reflect the deformation of the rock mass. This necessitates plugging leaks before installing displacement measurement components and grouting, but the results are unsatisfactory. The invention provides a borehole grouting device for monitoring instruments that perform borehole grouting after the installation of a multi-point displacement gauge displacement measurement component. This device achieves grouting, drainage, and leak plugging in one operation, offering advantages such as labor saving, speed, reliability, and convenience.

[0005] The monitoring instrument drilling grouting device of the present invention is installed at the borehole opening. The device comprises a main steel cylinder, a drain pipe, an exhaust pipe, a pressure gauge, a main grouting pipe, a supplementary grouting pipe, an in-hole grouting pipe, an in-hole exhaust pipe, a flange, a pre-embedded steel pipe, and a displacement measuring component. The pre-embedded steel pipe is embedded at the borehole opening, and the main steel cylinder is connected to the pre-embedded steel pipe via the flange. Both the main grouting pipe and the supplementary grouting pipe are installed at the ends of the main steel cylinder and communicate with its interior. The drain pipe is located at the lower part of the main steel cylinder, with its outlet end at the bottom of the main steel cylinder. The exhaust pipe is located at the upper part of the main steel cylinder, with its outlet end at the top of the main steel cylinder, and the pressure gauge is installed at the outlet end of the exhaust pipe. The in-hole grouting pipe, the in-hole exhaust pipe, and the displacement measuring component are all installed inside the main steel cylinder and the pre-embedded steel pipe. The in-hole grouting pipe is connected to the main grouting pipe or the supplementary grouting pipe of the main steel cylinder, and the in-hole exhaust pipe is connected to the exhaust pipe of the main steel cylinder.

[0006] The displacement measurement assembly includes a displacement gauge rod, a protective tube, and a displacement gauge anchor head. Several displacement gauge rods are arranged in parallel, each covered by a PVC protective tube, and the displacement gauge anchor head is fixed to the bottom of the displacement gauge rod.

[0007] Valves are installed on the drainage pipe, exhaust pipe, main grouting pipe, and supplementary grouting pipe of the main steel cylinder to facilitate control of the grouting process.

[0008] When the borehole is horizontal or downward inclined, the grouting pipe inside the borehole is connected to the main grouting pipe on the main steel cylinder; when the borehole is upward inclined, the grouting pipe inside the borehole is connected to the supplementary grouting pipe on the main steel cylinder, and the vent pipe inside the borehole is connected to the vent pipe on the main steel cylinder; the grouting pipe inside the borehole and the vent pipe inside the borehole extend to the bottom of the borehole.

[0009] After drilling is completed, a pre-embedded steel pipe is first installed at the borehole opening. Mortar is then backfilled between the pre-embedded steel pipe and the borehole wall. Next, several components, including a displacement measuring assembly, a grouting pipe, and a venting pipe, are installed in the pre-embedded steel pipe and inside the borehole. The main steel cylinder is then connected to the pre-embedded steel pipe via a flange. The valve on the drainage pipe is opened, allowing groundwater to drain out. During grouting, the valves on the main grouting pipe and the venting pipe are opened, while the valve on the drainage pipe is closed. Grout is injected into the borehole through the main grouting pipe, and air and groundwater inside the borehole are discharged through the venting pipe. When the grout flows out and its concentration matches that of the injected grout, close the vent valve. At this point, the pressure gauge pointer will rise, and when the pressure reaches 0.5 MPa, or the grouting pressure required by the design, close the main grouting pipe valve and maintain the pressure until the grout initially sets. If the hole is not filled with grout, supplement the grouting through the supplementary grouting pipe until it is full. After the grout has solidified, remove the main steel cylinder, take the pre-embedded steel pipe out of the borehole, and cut off the exposed grouting pipe and vent pipe at the borehole opening. The grouting is now complete, and the subsequent installation of monitoring instruments can proceed.

[0010] The grouting device for monitoring instruments of this invention is scientifically designed, easy to operate, and has a reasonable structure. Under geological conditions with abundant groundwater, it can complete grouting, drainage, and leak plugging in one go, and perform monitoring instrument borehole grouting quickly and effectively. It is labor-saving, fast, reliable, and convenient, and can control the grouting pressure to achieve pressurized grouting, ensuring the compactness of the grout. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0013] The components include: borehole 1, main steel cylinder 2, drainage pipe 3, vent pipe 4, pressure gauge 5, main grouting pipe 6, supplementary grouting pipe 7, in-hole grouting pipe 8, in-hole vent pipe 9, flange 10, embedded steel pipe 11, displacement gauge rod 12, protective pipe 13, and displacement gauge measuring point anchor head 14. Detailed Implementation

[0014] Example 1: A grouting device for a monitoring instrument borehole 1 is installed at the borehole opening of borehole 1. The grouting device includes a main steel cylinder 2, a drain pipe 3, an exhaust pipe 4, a pressure gauge 5, a main grouting pipe 6, a supplementary grouting pipe 7, an in-hole grouting pipe 8, a flange 10, a pre-embedded steel pipe 11, and a displacement measuring component. The pre-embedded steel pipe 11 is pre-embedded at the borehole opening of borehole 1. The main steel cylinder 2 is connected to the pre-embedded steel pipe 11 through the flange 10. The main grouting pipe 6 and the supplementary grouting pipe 7 are both installed on the main steel cylinder 2 and communicate with the interior of the main steel cylinder 2. The in-hole grouting pipe 8 and the displacement measuring component are both installed inside the main steel cylinder 2 and the pre-embedded steel pipe 11. The in-hole grouting pipe 8 is connected to the main grouting pipe 6 on the main steel cylinder 2. The drain pipe 3 is located at the lower part of the main steel cylinder 2, with its outlet end located at the bottom of the main steel cylinder 2. The exhaust pipe 4 is located at the upper part of the main steel cylinder 2, with its outlet end located at the top of the main steel cylinder 2. The pressure gauge 5 is installed at the outlet end of the exhaust pipe 4. The displacement measurement assembly includes displacement gauge rods 12, protective tubes 13, and displacement gauge anchor heads 14. Several displacement gauge rods 12 are arranged in parallel, each covered by a PVC protective tube 13. The displacement gauge anchor heads 14 are fixed to the bottom of the displacement gauge rods 12. Valves are installed on the drainage pipe 3, exhaust pipe 4, main grouting pipe 6, and supplementary grouting pipe 7 on the main steel cylinder 2 to facilitate control of the grouting process.

[0015] When borehole 1 is horizontal or downward-sloping, after completing borehole 1, a pre-embedded steel pipe 11 is first installed at the borehole opening. Mortar is backfilled between the pre-embedded steel pipe 11 and the borehole wall. Then, a displacement measuring assembly and a grouting pipe 8 are installed in the pre-embedded steel pipe 11 and borehole 1 respectively. The grouting pipe 8 is connected to the main grouting pipe 6 on the main steel cylinder 2 and extends to the bottom of borehole 1. Afterwards, the main steel cylinder 2 is connected to the pre-embedded steel pipe 11 via a flange 10. The valve on the drainage pipe 3 is opened, and groundwater is discharged through the drainage pipe 3. During grouting, the valves on the main grouting pipe 6 and the vent pipe 4 are opened, and the valve on the drainage pipe 3 is closed. Grouting proceeds through the main grouting pipe 6 and the grouting pipe... 8. Grouting is performed from the bottom of the borehole into the borehole. Air and groundwater in the borehole are discharged through the vent pipe 4. When grout flows out of the vent pipe 4 and the concentration is consistent with the grout injected, the valve of the vent pipe 4 is closed. At this time, the pointer of the pressure gauge 5 rises. When the pressure reaches 0.5MPa, or the grouting pressure required by the design, the valve of the main grouting pipe 6 is closed, and the pressure is maintained until the grout initially sets. If the grout in the borehole is not full, it is supplemented by grouting through the supplementary grouting pipe 7 until it is full. After the grout solidifies, the main steel cylinder 2 is removed, the pre-embedded steel pipe 11 is taken out from the borehole 1, and the grouting pipe 8 exposed at the borehole opening is cut off. At this point, the grouting is completed, and the subsequent installation of monitoring instruments can be carried out.

[0016] Example 2: A grouting device for a monitoring instrument borehole 1 is installed at the borehole opening of borehole 1. The grouting device includes a main steel cylinder 2, a drainage pipe 3, an exhaust pipe 4, a pressure gauge 5, a main grouting pipe 6, a supplementary grouting pipe 7, an in-hole exhaust pipe 9, an in-hole grouting pipe 8, a flange 10, a pre-embedded steel pipe 11, and a displacement measuring assembly. The pre-embedded steel pipe 11 is pre-embedded at the borehole opening of borehole 1. The main steel cylinder 2 is connected to the pre-embedded steel pipe 11 via the flange 10. Both the main grouting pipe 6 and the supplementary grouting pipe 7 are installed on the main steel cylinder 2. The grouting pipe 8, the vent pipe 9, and the displacement measuring assembly are all installed on the main steel cylinder 2 and the pre-embedded steel pipe 11. The grouting pipe 8 is connected to the supplementary grouting pipe 7 of the main steel cylinder 2, and the vent pipe 9 is connected to the vent pipe 4 of the main steel cylinder 2. The drain pipe 3 is located at the lower part of the main steel cylinder 2, with its outlet end at the bottom of the main steel cylinder 2. The vent pipe 4 is located at the upper part of the main steel cylinder 2, with its outlet end at the top of the main steel cylinder 2. The pressure gauge 5 is installed on the outlet end of the vent pipe 4. The displacement measuring assembly includes a displacement measuring rod 12, a protective pipe 13, and a displacement measuring point anchor head 14. Several displacement measuring rods 12 are arranged in parallel, with a PVC protective pipe 13 covering the displacement measuring rod 12. The displacement measuring point anchor head 14 is fixed to the bottom of the displacement measuring rod 12. Valves are installed on the drain pipe 3, vent pipe 4, main grouting pipe 6, and supplementary grouting pipe 7 on the main steel cylinder 2 to facilitate control of the grouting process.

[0017] When borehole 1 is an upward-sloping borehole 1, after completing borehole 1, a pre-embedded steel pipe 11 is first installed at the borehole opening. Mortar is backfilled between the pre-embedded steel pipe 11 and the borehole wall. Then, multiple components such as a displacement measuring assembly, a grouting pipe 8, and a venting pipe 9 are installed in the pre-embedded steel pipe 11 and borehole 1, respectively. The grouting pipe 8 and the venting pipe 9 are connected to the supplementary grouting pipe 7 and venting pipe 4 of the main steel cylinder 2, respectively, and extend to the bottom of borehole 1. Afterward, the main steel cylinder 2 is connected to the pre-embedded steel pipe 11 via a flange 10. The valve on the drainage pipe 3 is opened, and groundwater is discharged through the drainage pipe 3. During grouting, the valves on the main grouting pipe 6 and the venting pipe 4 are opened, and the valve on the drainage pipe 3 is closed. Grouting proceeds through the main grouting pipe 6... Grouting is performed from the borehole opening into the borehole. Air and groundwater inside the borehole are discharged through the vent pipe 9 and the vent pipe 4 of the main steel cylinder 2. When grout flows out of the vent pipe 4 and the concentration is consistent with the injected grout, the valve of the vent pipe 4 is closed. At this time, the pointer of the pressure gauge 5 rises, and the pressure reaches 0.5MPa, or the grouting pressure required by the design. Then, the valve of the main grouting pipe 6 is closed, and the pressure is maintained until the grout initially sets. If the borehole is not filled with grout, it is supplemented through the grouting pipe 7 until it is full. After the grout solidifies, the main steel cylinder 2 is removed, the pre-embedded steel pipe 11 is taken out of the borehole 1, and the exposed grouting pipe 8 and the vent pipe 9 at the borehole opening are cut off. At this point, the grouting is completed, and the subsequent installation of monitoring instruments can be carried out.

Claims

1. A grouting device for a monitoring instrument borehole, installed at the opening of a borehole (1), characterized in that... The grouting device includes a main steel cylinder (2), a drainage pipe (3), an exhaust pipe (4), a pressure gauge (5), a main grouting pipe (6), a supplementary grouting pipe (7), an in-hole grouting pipe (8), an in-hole exhaust pipe (9), a flange (10), a pre-embedded steel pipe (11), and a displacement measuring assembly. The pre-embedded steel pipe (11) is pre-embedded at the opening of the borehole (1). The main steel cylinder (2) is connected to the pre-embedded steel pipe (11) through the flange (10). The main grouting pipe (6) and the supplementary grouting pipe (7) are both installed at the end of the main steel cylinder (2) and are connected to the inside of the main steel cylinder (2). The grouting pipe (8), the vent pipe (9) inside the borehole, and the displacement measuring assembly are all installed inside the main steel cylinder (2) and the pre-embedded steel pipe (11). The grouting pipe (8) inside the borehole is connected to the main grouting pipe (6) or the supplementary grouting pipe (7) of the main steel cylinder (2). The vent pipe (9) inside the borehole is connected to the vent pipe (4) of the main steel cylinder (2). The drain pipe (3) is set at the lower part of the main steel cylinder (2), and the outlet end is set at the bottom of the main steel cylinder (2). The vent pipe (4) is set at the upper part of the main steel cylinder (2), and the outlet end is set at the top of the main steel cylinder (2). The pressure gauge (5) is installed on the outlet end of the vent pipe (4). The displacement measurement assembly includes a displacement measuring rod (12), a protective tube (13), and a displacement measuring point anchor (14). Several displacement measuring rods (12) are arranged in parallel. The displacement measuring rods (12) are covered with PVC protective tubes (13), and the displacement measuring point anchors (14) are fixed to the bottom of the displacement measuring rods (12). When the borehole (1) is horizontal or downward inclined, the grouting pipe (8) inside the hole is connected to the main grouting pipe (6) of the main steel cylinder (2), and the grouting pipe (8) inside the hole extends to the bottom of the borehole (1); when the borehole (1) is upward inclined, the grouting pipe (8) inside the hole and the vent pipe (9) inside the hole are connected to the supplementary grouting pipe (7) and the vent pipe (4) of the main steel cylinder (2) respectively, and extend to the bottom of the borehole (1).

2. The monitoring instrument borehole grouting device as described in claim 1, characterized in that... Valves are installed on the drainage pipe (3), exhaust pipe (4), main grouting pipe (6) and supplementary grouting pipe (7) of the main steel cylinder (2) to facilitate control of the grouting process.

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