In-hole upward hole osmometer embedding device and embedding method

Abstract

The invention relates to an in-hole upward hole osmometer embedding device and method. The device comprises a double-layer floral tube sleeve, a fixed water stop capsule, a detachable connector and a detachable conveying rod which are sequentially connected in series. An inner sleeve of the double-layer floral tube sleeve contains an osmometer and is filled with fine sand; gravels are filled between the inner sleeve and the outer sleeve to form an inverted filter structure; the fixed water stop capsule comprises an inflatable capsule, a restoring spring and a framework barrel, and the inflatable capsule can extrude and expand to be attached to the hole wall or reset to be separated from the hole wall; the detachable connector is connected with the framework barrel through threads, and the square rotating head and the *-shaped protrusion of the conveying rod are embedded to achieve synchronous rotation; the conveying rod can be connected with the extension rod to be matched with the deep hole. The method comprises the steps of assembling the device, connecting the conveying rod, pushing to the depth, rotating and fixing the water stop capsule, and disassembling the conveying rod. According to the invention, stable placement of the upward hole osmometer, anti-clogging protection equipment of the inverted filter structure and detachable design are realized, maintenance and reuse are supported, deep hole and short-term / long-term monitoring requirements are met, and a reliable technical means is provided for osmotic pressure monitoring of underground engineering.

Description

Technical Field

[0001] This invention relates to the field of hydrogeological survey technology, specifically to a device and method for burying an in-cavity borehole piezometer. Background Technology

[0002] Currently, various vertical borehole piezometer installation devices are available for field hydrogeological surveys, but there is still a lack of devices for installing piezometers in upward-sloping boreholes (inverted boreholes) within tunnels. With the large-scale construction of tunnel projects, the demand for piezometer monitoring in inverted boreholes is becoming increasingly urgent, and existing technologies cannot solve the problems of difficult placement and testing of piezometers in inverted boreholes. Summary of the Invention

[0003] In order to install piezometers in tunnel boreholes, the present invention provides a device and method for installing piezometers in boreholes, which can meet the needs of installing piezometers in upwardly inclined boreholes near the tunnel arch.

[0004] The technical solution adopted by this invention to solve its technical problem is: A device for burying a borehole piezometer in a tunnel includes a double-layer perforated tube sleeve, a fixed water-stop capsule, a disassembly connector, and a transport rod that is detachably connected to the disassembly connector, all fixed in series. The double-layer perforated tube sleeve includes an outer sleeve and an inner sleeve. Both the inner sleeve and the outer sleeve are perforated tube structures. The inner sleeve is used to place the piezometer and is filled with fine sand. The space between the outer sleeve and the inner sleeve is filled with gravel. The fixed water-stopping capsule includes an inflatable capsule, a restoring spring, and a skeleton barrel. The skeleton barrel consists of a central rod and an outer sleeve. The inflatable capsule can slide along the outer wall of the skeleton barrel. The restoring spring is sleeved on the central rod and can slide along the central rod. The osmotic pressure gauge wire passes through the central rod. The head of the central rod is provided with an external thread section. The front end of the disassembly connector is provided with an internal thread section, which is connected to the external thread section of the central rod. The rear end is provided with a square rotating head with a cross-shaped groove inside. The front end of the conveying rod is provided with a star-shaped protrusion that matches the square rotating head of the disassembly connector, and the rear end is provided with a connecting structure for extending its length.

[0005] Furthermore, the fine sand in the inner sleeve of the double-layer perforated tube sleeve and the gravel in the outer sleeve form a reverse filter structure to prevent clogging and protect the piezometer.

[0006] Furthermore, when the inflatable capsule of the fixed water-stopping capsule is squeezed by the disassembly connector, it expands laterally and adheres tightly to the borehole wall, forming a water-proof sealing area; when the disassembly connector rotates in the reverse direction, the restoring spring drives the inflatable capsule to stretch and reset longitudinally, detaching it from the borehole wall.

[0007] Furthermore, the disassembly connector engages with the star-shaped protrusion at the front end of the transport rod via a grid rotating head, achieving synchronous rotation to move back and forth along the central rod thread, squeezing or releasing the inflatable capsule.

[0008] Furthermore, the rear end connection structure of the transport rod is a connecting thread. The transport rod is divided into an installation transport rod and a disassembly transport rod, which respectively meet the installation and disassembly requirements of the piezometer. Both the installation transport rod and the disassembly transport rod include a star-shaped protrusion and a connecting thread. The function of the connecting thread is to extend the transport rod to achieve deep hole embedding and disassembly. The tightening direction of the connecting thread is different when disassembling the transport rod from that when installing the transport rod, so as to ensure that the disassembly transport rod remains connected during the disassembly process of the piezometer.

[0009] A method for installing an in-hole piezometer in a cave, using the aforementioned device, includes the following steps: Step 1: Assemble the device. Place the piezometer into the inner sleeve of the double-layer perforated tube sleeve, fill it with fine sand, and fill the space between the outer sleeve and the inner sleeve with gravel. Then, fix and connect the double-layer perforated tube sleeve, the fixed water-stop capsule, and the disassembled connector in sequence, so that the piezometer wire passes through the central rod of the fixed water-stop capsule. Step 2: Connect the transport rod, fit the star-shaped protrusion at the front end of the transport rod into the square rotating head of the disassembly connector, and connect the extension rod through the rear connection structure to adapt to the drilling depth; Step 3: Push the device to the preset depth. The assembled device is pushed to the specified depth of the borehole using a transport rod. Step 4: Fixing the device, rotating the conveyor rod drives the disassembly connector to move forward along the central rod thread, squeezing the inflatable capsule that fixes the water-stop capsule so that it expands laterally and fits tightly against the borehole wall, forming a water-proof and sealed area; Step 5: Disassemble the transport rod and pull it in the opposite direction to detach it from the disassembly connector, thus completing the installation of the piezometer.

[0010] Furthermore, in step 1, the steps of filling the inner sleeve with fine sand and the outer sleeve with gravel form a reverse filter structure to prevent clogging and protect the piezometer.

[0011] Furthermore, in step 4, when it is necessary to remove the pressure gauge, the connector is disassembled by rotating the transport rod in the opposite direction, so that the return spring drives the inflatable capsule to stretch and reset longitudinally, and the device is removed after it is separated from the borehole wall.

[0012] Furthermore, in step 2, the cross-shaped protrusion at the front end of the transport rod engages with the square rotating head of the disassembly connector to achieve synchronous rotation, thereby squeezing or releasing the inflatable capsule.

[0013] Furthermore, in step 2, the delivery rod is installed or removed according to the drilling depth, and its length is extended by an extension rod to adapt to the deep hole burial requirements.

[0014] The present invention has the following beneficial effects: 1. Solved the problem of "difficult placement" of borehole piezometers in tunnels, filling a technological gap. The device employs a modular, serial design consisting of a double-layer perforated sleeve, a fixed water-stop capsule, a detachable connector, and a transport rod, adaptable to horizontal or upward-sloping borehole environments. Specifically, the inflatable capsule for fixing the water-stop capsule can be expanded laterally by detaching the connector and pressed tightly against the borehole wall, ensuring stable fixation of the piezometer in the borehole. The return spring's reset function ensures flexible disassembly of the device, overcoming the technical bottleneck of traditional vertical drilling equipment's inability to reliably place in boreholes and filling a gap in borehole piezometer monitoring equipment.

[0015] 2. Achieve long-term protection and stable monitoring of the piezometer. The double-layer perforated pipe sleeve, with its inner sleeve filled with fine sand and the outer sleeve filled with gravel, forms a gradient reverse filtration system. This system can filter impurities in the water flow, prevent clogging of the piezometer's sensing components, and buffer the pressure of the surrounding rock on the borehole wall, preventing damage to the piezometer from direct contact with the rock. This significantly improves the accuracy of monitoring data and extends the equipment's lifespan.

[0016] 3. Easy to operate, supports deep hole installation and subsequent maintenance. Detachable connection design: The detachable connector engages with the cross-shaped protrusion of the transport rod via a square rotating head, achieving efficient transmission of rotational power and facilitating precise control of the expansion and repositioning of the fixed water-stop capsule in the borehole; the connection structure at the rear end of the transport rod supports the splicing of extension rods to meet the embedding requirements of boreholes at different depths.

[0017] Quick disassembly and maintenance: simply rotate the connector in the reverse direction to allow the return spring to lift the inflation capsule off the borehole wall. The piezometer can be removed without damaging the borehole structure, greatly reducing the difficulty of later maintenance or replacement and improving the equipment reuse rate.

[0018] 4. Enhance the adaptability of monitoring scenarios, taking into account both short-term and long-term measurement needs. The device enables short-term rapid monitoring through the immediate sealing of the fixed water-stop capsule; if long-term monitoring is required, permanent sealing can be achieved by filling the space between the fixed water-stop capsule and the orifice with concrete, adapting to the needs of different monitoring cycles in tunnel engineering and enhancing the practicality and scenario flexibility of the equipment.

[0019] In summary, this device effectively solves the problems of "difficult placement, difficult testing, and difficult maintenance" of borehole piezometers in tunnels through structural innovation, providing a reliable technical means for hydrogeological monitoring of underground engineering. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the in-hole piezometer installation device of the present invention; Figure 2 This is a schematic diagram illustrating the application scenario of the invention of the borehole piezometer installation device.

[0021] In the diagram: 1—Double-layer flower tube sleeve, 2—Fixed water-stop capsule, 3—Disassembly connector, 4—Transport rod, 5—Outer sleeve, 6—Inner sleeve, 7—Pyrometer, 8—Fine sand, 9—Gravel, 10—Inflatable capsule, 11—Recovery spring, 12—Skeleton barrel, 13—Center rod, 14—Sleeve, 15—Pyrometer wire, 16—External thread section, 17—Grid rotating head, 18—M-shaped protrusion. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the implementation process will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] like Figure 1 As shown, this embodiment of the invention provides a device for installing an in-cavity borehole piezometer, including a double-layer perforated sleeve 1, a fixed water-stop capsule 2, a disassembly connector 3, and a transport rod 4. The double-layer perforated sleeve 1, the fixed water-stop capsule 2, and the disassembly connector 3 are fixedly connected in series.

[0024] The double-layer perforated pipe sleeve 1 includes an outer sleeve 5 and an inner sleeve 6. The inner sleeve 6 is filled with a piezometer 7 and fine sand 8. The space between the inner and outer sleeves is filled with gravel 9 to prevent clogging and protect the piezometer 7.

[0025] The fixed water-stopping capsule 2 consists of an inflatable capsule 10, a restoring spring 11, and a skeleton barrel 12. The skeleton barrel 12 includes a central rod 13 and a sleeve 14. The head of the central rod 13 is threaded, allowing the inflatable capsule 10 to slide along the sleeve 14. When the disassembly connector 3 is rotated and moved forward along the thread, the inflatable capsule 10 is compressed and expands laterally, adhering tightly to the borehole wall, thus fixing the piezometer 7 and stopping the water flow. When the disassembly connector 3 is rotated and moved backward along the thread, the inflatable capsule 10 is stretched longitudinally under the action of the restoring spring 11, detaching from the borehole wall, at which point the piezometer 7 can be removed from the borehole.

[0026] The disassembly connector 3 has an internal thread at its front end, which is threaded to the fixed water-stop capsule 2. It can move back and forth on the fixed water-stop capsule 2 by rotation, thereby squeezing the inflation capsule 10 and fixing or removing the piezometer 7. The rear end of the disassembly connector 3 is a grid rotating head 17 with a star-shaped groove inside. Its function is to connect to the conveying rod 4, and the disassembly connector 3 is disassembled by twisting and rotating the conveying rod 4, thereby squeezing and fixing the water-stop capsule 2.

[0027] The transport rod 4 has a cross-shaped protrusion 18 at its front end that matches the square rotating head 17 of the disassembly connector 3. Its function is to connect to the disassembly connector 3 and rotate it to drive the disassembly connector 3. Furthermore, its shape ensures that it can rotate synchronously with the disassembly connector 3, and the connection can also be released by moving it back and forth. The rear end of the transport rod 4 has a connecting thread, allowing it to connect an extension rod to increase its length and achieve the purpose of deeper borehole installation. The transport rod is divided into an installation transport rod and a disassembly transport rod, respectively fulfilling the installation and disassembly requirements of the piezometer. Both the installation and disassembly transport rods include the cross-shaped protrusion and connecting thread. The connecting thread extends the transport rod to achieve deep hole installation and disassembly. The tightening direction of the connecting thread on the disassembly transport rod is different from that on the installation transport rod to ensure that the disassembly transport rod remains connected during the disassembly of the piezometer.

[0028] This invention also provides a method for installing an in-hole piezometer in a tunnel, using the aforementioned device. The method includes the following steps: Step 1: Drilling Preparation After the borehole is completed, the borehole is thoroughly cleaned, and the burial depth of the piezometer 7 is determined according to the strata conditions inside the cave.

[0029] Step 2: Preparation of piezometer and assembly of the device Component assembly: Place the piezometer 7 into the inner sleeve 6 of the double-layer perforated tube sleeve 1, fill it with fine sand 8, and fill the space between the outer sleeve 5 and the inner sleeve 6 with gravel 9 to form a reverse filter structure to prevent clogging and protect the piezometer 7; fix the double-layer perforated tube sleeve 1, the fixed water-stop capsule 2, and the disassembly connector 3 in series in sequence, so that the piezometer wire 15 passes through the central rod 13 of the fixed water-stop capsule 2, ensuring that the fixed water-stop capsule 2 is initially in a tensile state.

[0030] Performance test: Measure and mark the length of the piezometer lead wire 15 (to ensure accurate burial depth), and use a piezometer reader to test the reading of the piezometer 7 to confirm that it is in normal working condition.

[0031] Step 3: Installation of the piezometer in the borehole Connecting the transport rod: The cross-shaped protrusion 18 at the front end of the transport rod 4 is fitted with the square rotating head 17 of the disassembly connector 3, and the extension rod is connected through the connecting structure at the rear end of the transport rod 4 to adapt to the drilling depth.

[0032] Pushing the device to a preset depth: The assembled device is pushed to the specified depth of the borehole using the transport rod 4.

[0033] Fixing device: Rotate the conveying rod 4, which drives the disassembly connector 3 to move forward along the thread of the central rod 13, squeezing the inflatable capsule 10 of the fixed water-stop capsule 2 to make it expand laterally and stick tightly to the borehole wall, forming a water-proof and sealed area. At this time, the piezometer 7 is fixed inside the borehole.

[0034] Disassembly of the transport rod and long-term measurement: Pull the transport rod 4 in the opposite direction to detach it from the disassembly connector 3, remove it from the borehole, and complete the short-term measurement installation; if long-term measurement is required, fill the space between the fixed water-stop capsule 2 and the borehole opening with concrete to permanently seal the piezometer 7 inside the borehole.

[0035] Step 4: Data Connection Connect the piezometer lead wire 15 to the data acquisition device at the borehole opening to achieve automated measurement and recording of borehole seepage pressure. For example... Figure 2 As shown, when the present invention is in operation, the piezometer installation device is sent into the borehole to complete the installation of the piezometer in the borehole.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for embedding an in-cavity borehole piezometer, characterized in that, It comprises double-layer flower pipe sleeve (1), fixed water stop capsule (2), dismounting connector (3) and conveying rod (4) connected with dismounting connector (3) fixed in series. The double-layer flower pipe sleeve (1) comprises outer sleeve (5) and inner sleeve (6), both of which are flower pipe structure, the inner sleeve (6) is used for placing osmometer (7) and filling fine sand (8), and the outer sleeve (5) and the inner sleeve (6) are filled with gravel (9) between them. The fixed water stop capsule (2) comprises inflatable capsule (10), restoring spring (11) and framework barrel (12), the framework barrel (12) is composed of center rod (13) and sleeve (14), the inflatable capsule (10) can slide along the outer wall of the framework barrel (12), the restoring spring (11) is sleeved on the center rod (13) and can slide along the center rod (13), the osmometer lead wire (15) passes through the center rod (13), and the head of the center rod (13) is provided with an external thread segment (16). The front end of the dismounting connector (3) is provided with an internal thread segment matched with the external thread segment (16) of the center rod (13), and the rear end is provided with a square rotating head (17), and the inside is a rice-shaped recess. The front end of the conveying rod (4) is provided with a rice-shaped protrusion (18) matched with the square rotating head (17) of the dismounting connector (3), and the rear end is provided with a connecting structure for lengthening the conveying rod.

2. The apparatus of claim 1, wherein, The fine sand (8) in the inner sleeve (6) of the double-layer flower pipe sleeve (1) and the gravel (9) in the outer sleeve (5) form a reverse filtration structure for preventing clogging and protecting the osmometer (7).

3. The apparatus of claim 1, wherein, When the inflatable capsule (10) of the fixed water stop capsule (2) is extruded by the dismounting connector (3), it expands transversely and tightly adheres to the borehole wall, forming a water-sealed area; when the dismounting connector (3) is rotated in the opposite direction, the restoring spring (11) drives the inflatable capsule (10) to stretch longitudinally and reset, and the inflatable capsule (10) is separated from the borehole wall.

4. The apparatus of claim 1, wherein, The dismounting connector (3) is embedded with the rice-shaped protrusion (18) at the front end of the conveying rod (4) through the square rotating head (17), realizes synchronous rotation, moves forward and backward along the center rod (13) in thread, extrudes or releases the inflatable capsule (10).

5. The apparatus of claim 1, wherein, The rear end connecting structure of the conveying rod is a connecting thread, the conveying rod (4) is divided into an installation conveying rod and a dismounting conveying rod, and realizes the installation and dismounting requirements of the osmometer respectively; the installation conveying rod and the dismounting conveying rod both contain the rice-shaped protrusion (18) and the connecting thread, the connecting thread is used for lengthening the conveying rod to realize deep hole embedding and dismounting; the tightening directions of the connecting threads of the dismounting conveying rod and the installation conveying rod are different, so that the dismounting conveying rod remains connected during the dismounting process of the osmometer.

6. A method of embedding a borehole piezometer in a borehole, characterized by, The method comprises the following steps: Step 1: Assemble the device, place the osmometer (7) into the inner sleeve (6) of the double-layer flower pipe sleeve (1), fill the fine sand (8), and fill the gravel (9) between the outer sleeve (5) and the inner sleeve (6); sequentially fix the double-layer flower pipe sleeve (1), the fixed water stop capsule (2) and the dismounting connector (3) in series, so that the osmometer lead wire (15) passes through the center rod (13) of the fixed water stop capsule (2). Step 2: Connect the delivery rod (4), embed the cross-shaped protrusion (18) at the front end of the delivery rod (4) with the square rotating head (17) of the detachable connector (3), and connect the extension rod through the rear end connection structure to adapt to the drilling depth; Step 3: Push the device to the preset depth, and push the assembled device to the designated depth of the hole through the delivery rod (4); Step 4: Fix the device, rotate the delivery rod (4) to drive the detachable connector (3) to move forward along the central rod (13) in a threaded manner, and squeeze the inflatable capsule (10) of the water stop capsule (2) to make it expand horizontally and tightly adhere to the drilling wall, forming a water-blocking area; Step 5: Remove the delivery rod, pull the delivery rod (4) in the opposite direction to make it disengage from the detachable connector (3), and complete the installation of the osmometer.

7. The method of claim 6, wherein, In step 1, the inner sleeve (6) filled with fine sand (8) and the outer sleeve (5) filled with gravel (9) form a filter structure to prevent clogging and protect the osmometer (7).

8. The method of claim 6, wherein, In step 4, when the osmometer needs to be removed, rotate the detachable connector (3) in the opposite direction through the delivery rod (4) to make the recovery spring (11) drive the inflatable capsule (10) to stretch longitudinally and reset, and then remove the device after it is separated from the drilling wall.

9. The method of claim 6, wherein, In step 2, the cross-shaped protrusion (18) at the front end of the delivery rod (4) is embedded with the square rotating head (17) of the detachable connector (3) to achieve synchronous rotation to squeeze or release the inflatable capsule (10).

10. The method of claim 6, wherein, In step 2, according to the drilling depth, install the delivery rod or remove the delivery rod, and extend the length through the extension rod to adapt to the deep hole installation requirements.

Images