A surrounding rock borehole osmometer integrated installation device and installation method

Abstract

The application discloses a kind of surrounding rock borehole osmometer integration installation device and installation method, device contains outer mould, limit steel casing, inner mould, inner mould positioning slide bar, inner mould support rod, handle and mesh positioning support plate;Outer mould is the cylinder of adapting borehole inner diameter, limit steel casing is welded to its outside, and inner mould is slidably connected with outer mould by positioning slide bar, and hollow tubular inner mould support rod is welded on inner mould;When using, first fill fine sand in outer mould, with mesh positioning support plate, osmometer is fixed in the middle, preloaded to form integrated filling body, then outer mould is sent into borehole, and inner mould is pushed by support rod, filling body is pushed into borehole as a whole, and finally hole sealing is completed;Corresponding installation method contains device assembly, osmometer preloading, integrated filling body preparation, sending into borehole, pushing out filling body, hole sealing step.The application can realize osmometer once installation in place, in the middle of hole, depth precision control and fine sand dense filling, and the device structure is simple, low in cost and reusable.

Description

Technical Field

[0001] This invention belongs to the field of safety monitoring technology for water conservancy and hydropower projects, specifically relating to an integrated installation device and installation method for a borehole piezometer in surrounding rock. Background Technology

[0002] A borehole piezometer is a specialized sensor used in hydraulic and hydropower projects and geotechnical engineering to measure pore water pressure and fracture water pressure at different depths in rock or soil. Its main body is typically made of stainless steel, and internally it contains a permeable stone, a sensing diaphragm, a sensing element, a temperature probe, and a waterproof cable. It converts changes in water pressure into hydraulic head values ​​for long-term automated monitoring of seepage conditions, playing a crucial role in early warning of seepage safety risks.

[0003] Currently, the installation of piezometers in boreholes in surrounding rock typically involves a manual, step-by-step filling method. This involves manually filling the bottom of the borehole with a certain thickness of fine sand, placing the piezometer inside, backfilling with bentonite to isolate it from external water according to design requirements, and finally sealing the borehole with cement mortar. This traditional installation method has the following prominent problems: First, the piezometer is prone to shifting during its descent and positioning after being placed from the borehole opening, making it impossible to ensure its centering within the borehole. This can lead to the piezometer contacting or being offset from the borehole wall, affecting the accuracy of monitoring data. Second, the fine sand is freely filled from top to bottom within the borehole, making it difficult to ensure compaction and creating voids that reduce the permeability around the piezometer. Third, because there are no graduation markings inside the borehole, the actual installation depth of the piezometer is difficult to control accurately, often resulting in discrepancies between the installation depth and the design depth. Fourth, the aforementioned manual step-by-step operation process is cumbersome, time-consuming to install each piezometer, and inefficient. Currently, there is no mature, integrated installation device on the market specifically for installing piezometers in surrounding rock boreholes. Summary of the Invention

[0004] To address the technical problems in the installation of borehole piezometers in existing technologies, such as the inability to install them in one go, the inability to center them in the borehole, inaccurate installation depth, insufficient compaction of fine sand, and long installation time, this invention provides an integrated installation device and method for borehole piezometers in surrounding rock.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An integrated installation device for a borehole piezometer in surrounding rock includes an outer mold, a limiting steel sleeve, an inner mold, an inner mold positioning slide rod, an inner mold support rod, an inner mold support rod handle, and a mesh positioning support plate.

[0006] The outer mold is a cylindrical structure that matches the inner diameter of the borehole in the surrounding rock. One end of the outer mold is an open end, and the other end is a limiting end. The limiting steel sleeve is welded and fixed to the limiting end of the outer mold, and the limiting steel sleeve protrudes outward along the radial direction of the outer mold. The inner mold is a circular plate-shaped structure that matches the inner diameter of the outer mold and is located inside the limiting end of the outer mold. The outer edge of the inner mold is in sliding fit with the inner wall of the outer mold, and an inner mold sliding hole is provided on the inner mold. The inner mold positioning slide rod is welded and fixed to the inner wall of the outer mold along the axial direction. The inner mold positioning slide rod passes through the inner mold sliding hole on the inner mold, and the inner mold positioning slide rod and the inner mold sliding hole form a sliding fit to guide the inner mold to slide along the axial direction of the outer mold. The inner mold support rod is a hollow tubular structure, welded and fixed to the side of the inner mold away from the inner mold. The inner mold support rod extends axially along the outer mold, passes through the limiting steel sleeve, and extends beyond the limiting end of the outer mold. It is used to push the inner mold to slide axially from the limiting end to the opening end, pushing the pre-installed fine sand and piezometer inside the outer mold out of the opening end and into the surrounding rock borehole. The handle of the inner mold support rod is connected to the end of the inner mold support rod away from the inner mold, and the handle and the inner mold support rod are connected in a T-shape to apply thrust. The mesh positioning support plate is located inside the outer mold. The outer contour of the mesh positioning support plate is a circle matching the inner cross-section of the outer mold. The outer edge of the mesh positioning support plate has a clearance notch corresponding to the position of the inner mold positioning slide rod, allowing the mesh positioning support plate to move axially along the outer mold past the inner mold positioning slide rod. The mesh positioning support plate is used to center and fix the piezometer inside the outer mold.

[0007] Furthermore, the outer wall of the outer mold is provided with graduations arranged in the axial direction to mark the installation depth position of the piezometer inside the outer mold.

[0008] Furthermore, the piezometer is connected to a monitoring cable, and the reading end of the monitoring cable passes through the hollow cavity of the inner mold support rod and the handle of the inner mold support rod in sequence before being led out to the outside of the limiting end of the outer mold.

[0009] Furthermore, the outside of the piezometer is wrapped with geotextile to filter soil particles and prevent fine sand from clogging the permeable stone of the piezometer.

[0010] Furthermore, the mesh positioning support plate is a plate-shaped structure with multiple through holes, the diameter of which is smaller than the particle size of fine sand; the clearance notch is an arc-shaped notch recessed inward along the outer edge of the mesh positioning support plate, the inner diameter of which is larger than the outer diameter of the inner mold positioning slide rod; there are two mesh positioning support plates, which are spaced apart above and below the piezometer along the axial direction of the outer mold, clamping and fixing the piezometer between the two mesh positioning support plates.

[0011] Furthermore, the number of inner mold positioning slide rods is at least two, which are evenly spaced along the inner wall of the outer mold; correspondingly, the number and position of the inner mold sliding holes on the inner mold correspond one-to-one with the inner mold positioning slide rods.

[0012] Furthermore, the outer mold is made of thin-walled galvanized steel pipe or galvanized steel plate welded together; the limiting steel sleeve is made of galvanized steel pipe welded together; the inner mold is made of galvanized steel plate; the inner mold positioning slide rod is made of round steel bar; the inner mold support rod and the inner mold support rod handle are made of galvanized steel pipe; and the mesh positioning support plate is made of PVC mesh plate cut from sheet metal.

[0013] Furthermore, the inner mold support rod is welded and fixed at the center position of the side of the inner mold facing away from the interior of the outer mold.

[0014] The present invention also provides an integrated installation method for a borehole piezometer based on the above-mentioned installation device, comprising the following steps: S1. Device assembly: Insert the inner mold into the inner mold positioning slide rod through the inner mold sliding hole, so that the inner mold is located inside the limiting end of the outer mold, and complete the sliding connection between the outer mold and the inner mold; pass the reading end of the monitoring cable of the piezometer through the hollow inner cavity of the inner mold support rod and the handle of the inner mold support rod in sequence and then lead it out.

[0015] S2. Piezometer Pre-installation: Place the outer mold vertically with the limiting end facing down and the open end facing up; fill the outer mold with fine sand from the open end, compacting it as you fill; determine the filling depth according to the scale on the outer wall of the outer mold; when the fine sand is filled to the designed installation depth of the piezometer, align the clearance notch of a mesh positioning support plate with the inner mold positioning slide rod and place it inside the outer mold; place the piezometer in the center above the mesh positioning support plate; then place another mesh positioning support plate above the piezometer in the same way, so that the piezometer is clamped and fixed between the two mesh positioning support plates.

[0016] S3. Preparation of integrated filler: Continue to fill the interior of the outer mold with fine sand, compacting it as you fill, until the interior of the outer mold is completely filled, so that the fine sand, piezometer and mesh positioning support plate form an integrated filler.

[0017] S4. Insert into the borehole: Flip the outer mold and insert it into the surrounding rock borehole with the open end facing forward. The limiting steel sleeve is placed against the opening of the surrounding rock borehole to limit its movement. At this time, the piezometer has reached the designed installation depth.

[0018] S5. Pushing out the filler: By applying force with both hands using the handle of the inner mold support rod, push the inner mold support rod to drive the inner mold to slide axially from the limiting end to the opening end within the outer mold, pushing the integrated filler out of the opening end of the outer mold and into the surrounding rock borehole. During the pushing process, the mesh positioning support plate smoothly passes over the inner mold positioning slide rod through the avoidance notch on its outer edge without any movement interference. Because the fine sand is pre-compacted and positioned by the mesh positioning support plate, the filler maintains its integrity after pushing out, and the position of the piezometer does not shift.

[0019] S6. Sealing: Slowly pull out the outer mold, then use bentonite to backfill the waterproof layer according to the design requirements, and finally use cement mortar to seal the borehole in the surrounding rock to complete the installation of the piezometer.

[0020] Furthermore, in step S2, before the piezometer is placed into the outer mold, it is first wrapped with geotextile to filter soil particles and prevent fine sand from clogging the permeable stone of the piezometer.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. Achieve one-time installation of the piezometer: By pre-assembling fine sand and the piezometer inside the outer mold to form an integrated filler, the integrated filler is pushed into the borehole using the inner mold, avoiding the step-by-step filling and repeated adjustment process in the traditional method, thus achieving one-time installation of the piezometer.

[0022] 2. Ensure the piezometer is centered in the borehole: The cylindrical structure of the outer mold matches the inner diameter of the borehole in the surrounding rock. The piezometer is fixed in the centered position inside the outer mold by a mesh positioning support plate. After being pushed out, it remains centered, avoiding the piezometer from shifting or contacting the borehole wall.

[0023] 3. Improve the compaction of fine sand filling: Fine sand is filled and compacted inside the outer mold, the operating space is controllable, the filling quality can be checked, and the filling density is higher than that of filling directly inside the borehole.

[0024] 4. Precise control of installation depth: The installation depth of the piezometer is precisely controlled by the scale on the outer wall of the outer mold, avoiding discrepancies between the installation depth and the design depth.

[0025] 5. Improved installation efficiency and reduced costs: The entire installation process is simple and quick, with short installation time. The device has a simple structure, low manufacturing cost, and is reusable, resulting in good economic and social benefits. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the integrated installation device for the surrounding rock borehole piezometer of the present invention.

[0027] Figure 2 This is a schematic diagram showing the usage status of the integrated installation device for the surrounding rock borehole piezometer of the present invention.

[0028] In the diagram: 1-Outer mold, 2-Limiting steel sleeve, 3-Inner mold, 4-Inner mold sliding hole, 5-Inner mold positioning slide rod, 6-Inner mold support rod, 7-Inner mold support rod handle, 8-Mesh positioning support plate, 9-Pyrometer, 10-Monitoring cable, 11-Fine sand, 12-Scale, 13-Rock borehole. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The following embodiments are only used to illustrate the technical solutions of the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0030] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides an integrated installation device and method for a borehole piezometer in surrounding rock, which is suitable for installing a vibrating wire piezometer in a borehole with a diameter of φ110mm and a depth of 1m in the surrounding rock of underground caverns.

[0031] The installation device in this embodiment consists of an outer mold 1, a limiting steel sleeve 2, an inner mold 3, an inner mold positioning slide rod 5, an inner mold support rod 6, an inner mold support rod handle 7, and a mesh positioning support plate 8, and is used in conjunction with a piezometer 9, a monitoring cable 10, and fine sand 11.

[0032] The outer mold 1 is a cylindrical structure, made of thin-walled galvanized steel pipe with an inner diameter of φ110mm, a length of 1m, and a wall thickness of 1.5mm, or rolled and welded from thin-walled galvanized steel sheet of the same specifications. The outer diameter of the outer mold 1 matches the inner diameter of the surrounding rock borehole 13. One end of the outer mold 1 is a limiting end (used for filling and installing the inner mold 3), and the other end is an open end (used for pushing out the filler). The outer wall of the outer mold 1 is provided with graduations 12 arranged in the axial direction for accurately marking the depth position when filling fine sand 11 and installing the piezometer 9.

[0033] The limiting steel sleeve 2 is made of galvanized steel pipe with a diameter of φ25mm and a length of 50mm, and is welded and fixed to the limiting end of the outer mold 1. The limiting steel sleeve 2 protrudes outward along the radial direction of the outer mold 1. When the outer mold 1 is sent into the surrounding rock borehole 13, the limiting steel sleeve 2 abuts against the borehole opening to limit the movement and prevent the outer mold 1 from sliding completely into the borehole.

[0034] The inner mold 3 is a circular plate structure made of galvanized steel plate with a diameter of φ110mm and a thickness of 2.5mm. The outer diameter of the inner mold 3 matches the inner diameter of the outer mold 1, so that the outer edge of the inner mold 3 fits against the inner wall of the outer mold 1, forming a sliding fit. The inner mold 3 can slide smoothly along the axial direction inside the outer mold 1. The inner mold 3 has at least two inner mold sliding holes 4 with a diameter of φ12mm, which are evenly spaced along the circumference of the inner mold 3.

[0035] The inner mold positioning slide rod 5 is made of round steel bar with a diameter of φ10mm and a length of 1m, and is welded and fixed to the inner wall of the outer mold 1, arranged along the axial direction of the outer mold 1. There are at least two inner mold positioning slide rods 5, evenly spaced along the circumference of the inner wall of the outer mold 1, corresponding one-to-one with the inner mold sliding holes 4 on the inner mold 3. The inner mold positioning slide rod 5 passes through the inner mold sliding holes 4 on the inner mold 3, forming a sliding fit between the inner mold positioning slide rod 5 and the inner mold sliding holes 4, guiding the inner mold 3 to slide smoothly along the axial direction within the outer mold 1, preventing the inner mold 3 from tilting or jamming during the sliding process.

[0036] The inner mold support rod 6 is made of galvanized steel pipe with a diameter of φ20mm and a length of 1050mm. It is a hollow tubular structure and is welded and fixed to the center of the inner mold 3 on the side opposite to the interior of the outer mold 1. The inner mold support rod 6 extends along the axial direction of the outer mold 1, passes through the limiting steel sleeve 2, and extends out of the limiting end of the outer mold 1 to the outside of the outer mold 1. The hollow cavity of the inner mold support rod 6 is used to pass through the monitoring cable 10 of the piezometer 9. In use, by pushing the inner mold support rod 6, the inner mold 3 is slid along the axial direction inside the outer mold 1 from the limiting end to the opening end, pushing the pre-installed fine sand 11 and the piezometer 9 out of the opening end and into the surrounding rock borehole 13.

[0037] The handle 7 of the inner mold support rod is made of galvanized steel pipe with a diameter of φ20mm and a length of 150mm. It is welded to the end of the inner mold support rod 6 away from the inner mold 3. The handle 7 and the inner mold support rod 6 are connected in a T-shape, which is convenient for construction personnel to hold and apply force with both hands. The reading end of the monitoring cable 10 passes through the hollow cavity of the inner mold support rod 6 and the handle 7 in sequence and is led out to the outside of the limiting end of the outer mold 1.

[0038] The perforated positioning support plate 8 is made of PVC perforated board with a mesh diameter of 2mm. Its main body outline is circular, matching the inner cross-section of the outer mold 1. The outer edge of the perforated positioning support plate 8 has an inwardly recessed arc-shaped clearance notch corresponding to the position of the inner mold positioning slide rod 5. The inner diameter of the arc-shaped notch is slightly larger than the outer diameter φ10mm of the inner mold positioning slide rod 5, allowing the perforated positioning support plate 8 to smoothly pass over the inner mold positioning slide rod 5 without interference when moving axially inside the outer mold 1. Two perforated positioning support plates 8 are used, spaced apart above and below the piezometer 9 along the axial direction of the outer mold 1. The piezometer 9 is clamped and fixed between the two perforated positioning support plates 8, achieving centered positioning and longitudinal fixation of the piezometer 9 inside the outer mold 1. The mesh on the perforated positioning support plate 8 allows water to pass through but prevents fine sand from passing through, ensuring the integrity of the filling material.

[0039] The piezometer 9 is used after being wrapped with geotextile. The geotextile serves to filter soil particles and prevent fine sand from clogging the permeable stone of the piezometer 9.

[0040] This embodiment also provides an integrated installation method for a rock borehole piezometer based on the above-mentioned installation device, the specific usage process of which is as follows: Step S1: Device Assembly. Insert the inner mold 3 into the inner mold positioning slide rod 5 through the inner mold sliding hole 4, so that the inner mold 3 is located inside the limiting end of the outer mold 1, completing the sliding connection between the outer mold 1 and the inner mold 3. Pass the reading end of the monitoring cable 10 through the hollow cavity of the inner mold support rod 6 and the inner mold support rod handle 7 in sequence, then let it hang freely outside the outer mold 1.

[0041] Step S2: Pre-installation of the piezometer. Wrap the piezometer 9 with geotextile and set aside. Place the outer mold 1 vertically with the limiting end facing down and the open end facing up. Fill the outer mold 1 with the required backfill material and fine sand 11 from the open end, compacting as you fill. Determine the filling depth according to the scale 12 on the outer wall of the outer mold 1. When the fine sand 11 reaches the designed installation depth of the piezometer 9, align the clearance notch of a mesh positioning support plate 8 with the inner mold positioning slide rod 5 and place it inside the outer mold 1. Center the piezometer 9 above the mesh positioning support plate 8. Then, place another mesh positioning support plate 8 above the piezometer 9 in the same manner, so that the piezometer 9 is clamped and fixed between the two mesh positioning support plates 8, achieving the centered positioning and longitudinal fixation of the piezometer 9.

[0042] Step S3: Preparation of integrated filler. Continue to fill the interior of the outer mold 1 with fine sand 11, compacting it as you fill, until the interior of the outer mold 1 is completely filled, so that the fine sand 11, the piezometer 9 and the mesh positioning support plate 8 form an integrated filler.

[0043] Step S4: Insert into the borehole. Flip the outer mold 1 and insert it into the surrounding rock borehole 13 with the open end facing forward. The limiting steel sleeve 2 is placed against the opening of the surrounding rock borehole 13 to limit its movement. At this time, the piezometer 9 has reached the designed installation depth.

[0044] Step S5: Push out the filler. Using both hands, apply force to the inner mold support rod handle 7, pushing the inner mold support rod 6 to slide the inner mold 3 axially from the limiting end to the opening end within the outer mold 1. This pushes the integrated filler out of the opening end of the outer mold 1 and into the surrounding rock borehole 13. During the pushing process, the mesh positioning support plate 8 smoothly passes over the inner mold positioning slide rod 5 through the avoidance notch on its outer edge without any movement interference. Because the fine sand 11 is pre-compacted and positioned by the mesh positioning support plate 8, the filler maintains its integrity after pushing out, and the position of the piezometer 9 does not shift.

[0045] Step S6: Sealing the hole. Slowly pull out the outer mold 1, then backfill the waterproof layer with bentonite according to the design requirements, and finally seal the surrounding rock borehole 13 with cement mortar to complete the installation of the piezometer 9.

[0046] The installation device in this embodiment has a simple structure and low manufacturing cost. It is made entirely of conventional metal materials and PVC panels, and can be customized according to different hole diameters and depths, making it highly adaptable and reusable. It has been practically applied in monitoring seepage water pressure in underground cavern surrounding rock, significantly improving installation efficiency and providing accurate and reliable monitoring data.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated installation device for a borehole piezometer in surrounding rock, characterized in that, It includes an outer mold (1), a limiting steel sleeve (2), an inner mold (3), an inner mold positioning slide rod (5), an inner mold support rod (6), an inner mold support rod handle (7), and a mesh positioning support plate (8). The outer mold (1) is a cylindrical structure that matches the inner diameter of the surrounding rock borehole (13). One end of the outer mold (1) is an open end, and the other end is a limiting end. The limiting steel sleeve (2) is welded and fixed to the limiting end of the outer mold (1), and the limiting steel sleeve (2) protrudes outward along the radial direction of the outer mold (1); The inner mold (3) is a circular plate structure that matches the inner diameter of the outer mold (1). The inner mold (3) is located inside the limiting end of the outer mold (1). The outer edge of the inner mold (3) is in sliding fit with the inner wall of the outer mold (1). The inner mold (3) has an inner mold sliding hole (4). The inner mold positioning slide rod (5) is welded and fixed to the inner wall of the outer mold (1) along the axial direction of the outer mold (1). The inner mold positioning slide rod (5) passes through the inner mold sliding hole (4) on the inner mold (3). The inner mold positioning slide rod (5) and the inner mold sliding hole (4) form a sliding fit to guide the inner mold (3) to slide along the axial direction of the outer mold (1). The inner mold support rod (6) is a hollow tubular structure. The inner mold support rod (6) passes through the limiting steel sleeve (2). The inner mold support rod (6) extends along the axial direction of the outer mold (1) and extends out of the limiting end of the outer mold (1). It is used to push the inner mold (3) to slide from the limiting end to the opening end along the axial direction of the outer mold (1). The fine sand (11) and the piezometer (9) pre-installed in the outer mold (1) are pushed out of the opening end as a whole and sent into the surrounding rock borehole (13). The inner mold support rod handle (7) is connected to the end of the inner mold support rod (6) away from the inner mold (3), and the inner mold support rod handle (7) and the inner mold support rod (6) are connected in a T-shape for applying thrust; The mesh positioning support plate (8) is disposed inside the outer mold (1). The outer contour of the main body of the mesh positioning support plate (8) is a circle that matches the inner cross section of the outer mold (1). The outer edge of the mesh positioning support plate (8) is provided with a clearance notch corresponding to the position of the inner mold positioning slide rod (5), so that the mesh positioning support plate (8) can move past the inner mold positioning slide rod (5) along the axial direction of the outer mold (1). The mesh positioning support plate (8) is used to center and fix the piezometer (9) inside the outer mold (1).

2. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The outer wall of the outer mold (1) is provided with a scale (12) arranged in the axial direction. The scale (12) is used to mark the installation depth position of the piezometer (9) in the outer mold (1).

3. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The piezometer (9) is connected to a monitoring cable (10). The reading end of the monitoring cable (10) passes through the hollow cavity of the inner mold support rod (6) and the handle (7) of the inner mold support rod in sequence and is led out to the outside of the limiting end of the outer mold (1).

4. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The outside of the piezometer (9) is wrapped with geotextile to filter soil particles and prevent fine sand from clogging the permeable stone of the piezometer (9).

5. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The mesh positioning support plate (8) is a plate-shaped structure with multiple through holes, the diameter of which is smaller than the particle size of fine sand (11); the clearance notch is an arc-shaped notch that is recessed inward along the outer edge of the mesh positioning support plate (8), the inner diameter of which is larger than the outer diameter of the inner mold positioning slide rod (5); there are two mesh positioning support plates (8), and the two mesh positioning support plates (8) are spaced apart above and below the piezometer (9) along the axial direction of the outer mold (1), clamping and fixing the piezometer (9) between the two mesh positioning support plates (8).

6. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The number of inner mold positioning slide rods (5) is at least two, and the at least two inner mold positioning slide rods (5) are evenly spaced along the inner wall of the outer mold (1); correspondingly, the number and position of the inner mold sliding holes (4) on the inner mold (3) correspond one-to-one with the inner mold positioning slide rods (5).

7. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The outer mold (1) is made of thin-walled galvanized steel pipe or galvanized steel plate by welding; the limiting steel sleeve (2) is made of galvanized steel pipe by welding; the inner mold (3) is made of galvanized steel plate; the inner mold positioning slide rod (5) is made of round steel bar; the inner mold support rod (6) and the inner mold support rod handle (7) are made of galvanized steel pipe; the mesh positioning support plate (8) is made of PVC mesh plate by cutting.

8. The integrated installation device for a borehole piezometer in surrounding rock according to claim 1, characterized in that, The inner mold support rod (6) is welded and fixed to the center position of the inner mold (3) on the side opposite to the interior of the outer mold (1).

9. A method for integrating a borehole piezometer with the installation device according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Device assembly: Insert the inner mold (3) into the inner mold positioning slide rod (5) through the inner mold sliding hole (4) so ​​that the inner mold (3) is located inside the limiting end of the outer mold (1) to complete the sliding connection between the outer mold (1) and the inner mold (3); pass the reading end of the monitoring cable (10) of the piezometer (9) through the hollow cavity of the inner mold support rod (6) and the handle (7) of the inner mold support rod in sequence and then lead it out; S2, Pre-installation of piezometer: Place the outer mold (1) vertically with the limiting end facing down and the opening end facing up; fill the outer mold (11) with fine sand (11) from the opening end, compacting it as you fill; determine the filling depth according to the scale (12) on the outer wall of the outer mold (1); when the fine sand (11) is filled to the designed installation depth of the piezometer (9), align the clearance notch of one of the mesh positioning support plates (8) with the inner mold positioning slide rod (5) and place it inside the outer mold (1); place the piezometer (9) in the center above the mesh positioning support plate (8); and place another mesh positioning support plate (8) above the piezometer (9) in the same way, so that the piezometer (9) is clamped and fixed between the two mesh positioning support plates (8); S3. Preparation of integrated filler: Continue to fill the interior of the outer mold (1) with fine sand (11) while filling and compacting until the interior of the outer mold (1) is completely filled, so that the fine sand (11), the piezometer (9) and the mesh positioning support plate (8) form an integrated filler; S4. Insert into the borehole: Flip the outer mold (1) and insert it into the surrounding rock borehole (13) with the open end facing forward. The limiting steel sleeve (2) abuts against the opening of the surrounding rock borehole (13) to limit its position. S5. Push out the filler: By applying force through the handle (7) of the inner mold support rod, push the inner mold support rod (6) to drive the inner mold (3) to slide along the axial direction from the limiting end to the opening end in the outer mold (1), and push the integrated filler out of the opening end of the outer mold (1) and send it into the surrounding rock borehole (13). S6. Sealing: Remove the outer mold (1), backfill the waterproof layer with bentonite according to the design requirements, and then seal the surrounding rock borehole (13) with cement mortar.

10. The integrated installation method for a borehole piezometer in surrounding rock according to claim 9, characterized in that, In step S2, before the piezometer (9) is placed into the outer mold (1), it is first wrapped with geotextile to filter soil particles and prevent fine sand (11) from clogging the permeable stone of the piezometer (9).

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