Borehole sealing structure

Abstract

A kind of survey hole sealing structure, detachable grouting pipe is installed on support plate, the outer periphery of grouting pipe is equipped with circumferentially arranged sector baffle, sector baffle can form relatively closed annular seal between grouting pipe and survey hole wall, grouting is injected into survey hole through grouting pipe, slurry fills the gap in survey hole, forms first sealing barrier, simultaneously, pull rope drives sector baffle to overturn upwards, forms relatively closed annular seal between grouting pipe and survey hole wall as second sealing defense line, and sector baffle is circumferentially arranged and mutually overlapped between adjacent sectors, can push sector baffle to form more closely closed with hole wall, further reduces leakage path.This double sealing structure effectively prevents the leakage of groundwater, soil, gas and impurities that may enter during construction, greatly improves the sealing reliability of survey hole, avoids the problems such as water and soil upwelling, foam overflow caused by poor sealing, and guarantees the normal operation of underground construction and ground traffic.

Description

Technical Field

[0001] This utility model relates to the technical field of exploration hole sealing devices, specifically an exploration hole sealing structure. Background Technology

[0002] Exploration boreholes, also known as exploratory boreholes, are holes drilled underground using drilling equipment to obtain underground geological data such as rock cores, mineral cores, and rock cuttings; to conduct geophysical logging; and to observe the hydrogeological dynamics of groundwater layers. Their main purpose is to identify, analyze, and evaluate the geological, environmental characteristics, and geotechnical conditions of the construction site, providing a scientific basis for subsequent engineering construction. After exploration is completed, the exploration borehole needs to be sealed to facilitate subsequent construction within the strata. Current sealing methods typically involve filling the borehole with clay balls and then installing a sealing cap at the borehole opening. However, existing sealing methods have limited sealing effectiveness. If tunnel excavation begins after sealing, foam from the cutterhead of the tunnel boring machine (TBM) can overflow to the surface through the exploration borehole during its movement, potentially causing soil and water runoff. This not only affects underground construction but also disrupts normal surface traffic. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure for exploration holes, which forms a relatively closed annular seal through grouting and a fan-shaped baffle, thus ensuring the sealing effect inside the exploration hole and solving the problems in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a sealing structure for an exploration hole, including a horizontally arranged support plate, a well-shaped bracket on one side of the support plate, and a detachable grouting pipe installed on the support plate at the center of the well-shaped bracket. Several circumferentially arranged fan-shaped baffles are hinged to the outer periphery of the grouting pipe at the end away from the support plate, with adjacent fan-shaped baffles overlapping each other. Each fan-shaped baffle is connected to a pull rope. The support plate has through holes that cooperate with the pull ropes. When the pull ropes cause the fan-shaped baffles to rotate upwards, all the fan-shaped baffles can form a relatively closed annular seal between the grouting pipe and the exploration hole wall. A recessed groove is provided at the center of the support plate, and a vertically arranged connecting pipe is provided in the recessed groove. The inner periphery of the connecting pipe has internal threads that cooperate with the grouting pipe, and the upper outer periphery of the connecting pipe has external threads. A snap cap is fitted onto the external threads, and the snap cap is completely located within the recessed groove. A groove is provided on the snap cap, and a rotating pull ring is hinged to the groove. The inner circumference of the through hole is provided with several upwardly inclined limiting teeth. The pull rope can pass through the bottom of the through hole and extend upwards. The limiting teeth can restrict the downward movement of the pull rope within the through hole. A limiting ring is installed at the end of the pull rope that extends upwards through the through hole. A positioning pin is provided on the arc surface of the fan-shaped baffle away from the grouting pipe. The grouting pipe is hinged to its outer periphery with four circumferentially arranged sector-shaped baffles. The grouting pipe also has four sets of circumferentially arranged first limiting blocks, with a first annular hinge shaft connecting the four sets of first limiting blocks. Below the first annular hinge shaft, the grouting pipe has four sets of circumferentially arranged second limiting blocks, with a second annular hinge shaft connecting the four sets of second limiting blocks. The first and second limiting blocks are staggered. Two sector-shaped baffles are mounted on the first annular hinge shaft, and the other two are mounted on the second annular hinge shaft. The sector-shaped baffles on the first and second annular hinge shafts are staggered and overlapped. When the pull rope causes the sector-shaped baffles to rotate upwards, the inner arc surface of the sector-shaped baffle remains in contact with the outer periphery of the grouting pipe.

[0005] The positive effects of this utility model are as follows: The exploration hole sealing structure described in this utility model has a detachable grouting pipe installed on a support plate. The outer circumference of the grouting pipe is provided with circumferentially arranged fan-shaped baffles. The fan-shaped baffles can form a relatively closed annular seal between the grouting pipe and the exploration hole wall. Grout is injected into the exploration hole through the grouting pipe, and the grout fills the gaps in the exploration hole, forming the first sealing barrier. At the same time, the pull rope drives the fan-shaped baffles to flip upward, forming a relatively closed annular seal between the grouting pipe and the exploration hole wall, serving as the second sealing line. Moreover, the fan-shaped baffles are arranged circumferentially and overlap each other. This design ensures that when the baffles flip to form a sealing ring, the baffles fit tightly together without obvious gaps. When groundwater or impurities rise, they can push the fan-shaped baffles to form a tighter seal with the hole wall, further reducing the leakage path. This double-sealing structure effectively prevents the leakage of groundwater, soil, gas, and impurities that may enter during construction, greatly improving the sealing reliability of the exploration borehole and avoiding problems such as water and soil gushing up and foam overflowing due to poor sealing, thus ensuring the normal progress of underground construction and surface traffic. Attached Figure Description

[0006] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is the front view of this utility model; Figure 3 yes Figure 2 Top view; Figure 4 yes Figure 2 Sectional view along line AA; Figure 5 yes Figure 3 A partial view of the BB-direction sectional view; Figure 6 yes Figure 5 A magnified view of part of I; Figure 7 This is a schematic diagram of the structure in which four fan-shaped baffles are hinged to the outer periphery of the grouting pipe; Figure 8 yes Figure 7 An enlarged view of the sectional view along the CC direction; Figure 9 yes Figure 7 An enlarged view of the sectional view along the DD direction; Figure 10 This is a schematic diagram of the installation of this utility model inside the exploration hole; Figure 11 yes Figure 10 A schematic diagram showing the state in which the centrally structured fan-shaped baffle flips upward to form an annular seal. Detailed Implementation

[0007] The exploration hole sealing structure described in this utility model, such as Figure 1-4 As shown, it includes a horizontally arranged support plate 1, a well-shaped bracket 2 on one side of the support plate 1, and a detachable grouting pipe 3 installed on the support plate 1 at the center of the well-shaped bracket 2. The well-shaped bracket 2 allows the support plate 1 to be positioned above the exploration hole, while the grouting pipe 3 extends into the exploration hole. Grouting into the exploration hole through the grouting pipe 3 can achieve preliminary sealing.

[0008] A number of circumferentially arranged sector-shaped baffles 4 are hinged to the outer periphery of the grouting pipe 3 away from the support plate 1. Adjacent sector-shaped baffles 4 overlap each other, and each sector-shaped baffle 4 is connected to a pull rope 5. The support plate 1 has through holes 6 that cooperate with the pull ropes 5. When the pull ropes 5 drive the sector-shaped baffles 4 to rotate upward, all sector-shaped baffles 4 can form a relatively closed annular seal between the grouting pipe 3 and the exploration hole wall, thus forming a second sealing structure for the exploration hole. The overlapping sector-shaped baffles 4 can effectively reduce the seepage path and improve the sealing strength. During the grouting process, even if groundwater, soil, or other impurities rise into the hole, they will push the sector-shaped baffles 4 to insert more tightly into the hole wall, thus forming a more stable annular sealing structure.

[0009] When using the borehole sealing structure to seal the borehole, first, fill the borehole with clay balls. Then, install the grouting pipe 3 onto the support plate 1, and place the well-shaped bracket 2 at the borehole opening. With the grouting pipe 3 inside the borehole, pull the rope 5 upwards, causing the fan-shaped baffle 4 to flip upwards and insert into the borehole wall, forming an annular seal between the grouting pipe 3 and the borehole wall. Subsequently, grout is injected into the borehole through the grouting pipe 3. After curing and solidification, it can form a double sealing structure with the fan-shaped baffle 4. Then, cut the rope 5, remove the grouting pipe 3 from the support plate 1, and cut off any grouting pipe 3 protruding outside the borehole. Finally, fill the hole above the fan-shaped baffle 4 with cement mortar to form the third sealing structure of the borehole, thereby effectively improving the sealing performance of the borehole.

[0010] Furthermore, such as Figure 5 As shown, a recessed groove 9 can be provided at the center of the support plate 1. A vertically arranged connecting pipe 7 is provided in the recessed groove 9. The inner circumference of the connecting pipe 7 is provided with an internal thread that mates with the grouting pipe 3, thereby enabling a detachable connection between the support plate 1 and the grouting pipe 3. The upper outer circumference of the connecting pipe 7 is provided with an external thread, and a snap cover 8 is fitted onto the external thread. The snap cover 8 is completely located within the recessed groove 9. A groove 10 is provided on the snap cover 8, and a hinged pull ring 11 that can be flipped is installed in the groove 10.

[0011] The grouting pipe 3 is easy to install and remove, and can be quickly installed using internal threads. After construction is completed, the support plate 1 can be disassembled and recycled, reducing material waste and improving equipment utilization. The cover 8 can seal the grouting pipe 3 when not grouting, preventing non-grout debris from entering the exploration hole and affecting subsequent grouting and solidification operations.

[0012] The cover 8 is completely located within the recessed groove 9, ensuring the overall flatness of the support plate 1 and facilitating storage and relocation. It also prevents damage to the cover 8 during construction. The pull ring 11 facilitates screwing the cover 8 into the recessed groove 9, and can also rotate into the groove 10, preventing it from protruding and interfering with normal construction, thus ensuring smooth and safe operation. The support plate 1, well-shaped bracket 2, grouting pipe 3, and other components can all be independently designed and their dimensions can be flexibly adjusted according to the borehole diameter to adapt to different engineering needs.

[0013] To limit the movement of the pull rope 5 and prevent accidental operation such as the pull rope 5 slipping out of the hand, which would affect the positioning and insertion of the sector baffle 4 on the hole wall, such as... Figure 6 As shown, the inner circumference of the through hole 6 is provided with several inclined upward limiting teeth 12. The pull rope 5 can pass through the bottom of the through hole 6 and go upward. The limiting teeth 12 can restrict the downward movement of the pull rope 5 in the through hole 6. A limiting ring 18 is installed at one end of the pull rope 5 that goes upward through the through hole 6.

[0014] The above-described structure prevents the pull rope 5 from loosening or falling off due to external force or misoperation during construction, ensuring that the sector baffle 4 can be stably maintained in the sealed position. Simultaneously, a limit ring 18 is installed at the end of the pull rope 5 that extends upward through the through hole 6, providing initial restraint on the pull rope 5. This ensures that the pull rope 5 is already through the through hole 6 before use, facilitating subsequent lifting operations by pulling the limit ring 18.

[0015] Furthermore, in order to ensure that the outer arc surface of the fan-shaped baffle 4 can be stably inserted into the hole wall during the upward flipping process, a positioning nail 13 is provided on the arc surface of the fan-shaped baffle 4 away from the grouting pipe 3. After the baffle is flipped into place, the positioning nail 13 can be inserted into the hole wall to fix the position of the baffle and prevent it from shifting under the action of underground pressure or construction vibration, thus ensuring the long-term stability of the sealing structure.

[0016] Furthermore, four circumferentially arranged sector-shaped baffles 4 can be hinged to the outer periphery of the grouting pipe 3. To ensure the sealing performance of the annular space between the grouting pipe 3 and the borehole wall during the rotation of the sector-shaped baffles 4, such as... Figure 7-9As shown, the grouting pipe 3 is provided with four sets of first limiting blocks 14 arranged in a circle, and a first annular hinge shaft 15 is installed between the four sets of first limiting blocks 14. The grouting pipe 3 below the first annular hinge shaft 15 is provided with four sets of second limiting blocks 16 arranged in a circle, and a second annular hinge shaft 17 is installed between the four sets of second limiting blocks 16.

[0017] The first limiting block 14 and the second limiting block 16 are arranged alternately. Fan-shaped baffles 4 are located on the annular hinge shaft between the limiting blocks. Two fan-shaped baffles 4 are mounted on the first annular hinge shaft 15, and the other two are mounted on the second annular hinge shaft 17. The fan-shaped baffles 4 on the first annular hinge shaft 15 and the fan-shaped baffles 4 on the second annular hinge shaft 17 are arranged in an overlapping manner. The two fan-shaped baffles 4 on the first annular hinge shaft 15 are arranged correspondingly, and the two fan-shaped baffles 4 on the second annular hinge shaft 17 are arranged correspondingly, forming a closed annular structure that overlaps and covers each other between the grouting pipe 3 and the borehole wall. When the pull rope 5 drives the fan-shaped baffles 4 to rotate upwards, the inner arc surface of the fan-shaped baffle 4 always fits against the outer circumference of the grouting pipe 3, while the outer arc surface of the fan-shaped baffle 4 inserts into the borehole wall, thus achieving a relatively closed annular sealing structure.

[0018] This double-ring hinge shaft design makes the connection of the fan-shaped baffle 4 more robust, forming an "overlapping" structure that disperses the force and enhances the overall connection strength. It can withstand greater underground pressure and construction vibration, avoid the risk of single-point failure, and ensure the stability and reliability of the sealing structure under complex geological conditions and construction environments.

[0019] Furthermore, the design of this exploration borehole sealing structure offers considerable flexibility. By adjusting the dimensions and specifications of components such as the support plate 1, well-shaped bracket 2, grouting pipe 3, and fan-shaped baffle 4, it can adapt to the sealing requirements of exploration boreholes with different diameters. Whether for small geological exploration boreholes or large engineering exploration boreholes, a suitable sealing structure configuration can be found, demonstrating broad applicability. Because the sealing structure combines grouting and mechanical sealing, it can adapt to various geological conditions. In various strata such as soft soil, sand, and rock, effective sealing of the exploration borehole can be achieved by adjusting the performance of the grouting material and the grouting process, as well as by rationally designing the size and shape of the fan-shaped baffle, providing reliable protection for various engineering construction projects.

[0020] In summary, this utility model, through structural innovation and functional integration, achieves high efficiency, stability, and economy in sealing exploration holes, providing reliable technical support for underground engineering construction.

[0021] The technical solution of this utility model is not limited to the scope of the embodiments described herein. All technical contents not described in detail herein are publicly known technologies.

Claims

1. A sealing structure for an exploration hole, characterized in that: The system includes a horizontally arranged support plate (1), a well-shaped bracket (2) on one side of the support plate (1), and a detachable grouting pipe (3) installed on the support plate (1) at the center of the well-shaped bracket (2). Several circumferentially arranged fan-shaped baffles (4) are hinged to the outer periphery of the end of the grouting pipe (3) away from the support plate (1). Adjacent fan-shaped baffles (4) overlap each other, and each fan-shaped baffle (4) is connected to a pull rope (5). The support plate (1) has a through hole (6) that matches the pull rope (5). When the pull rope (5) drives the fan-shaped baffles (4) to rotate upward, all the fan-shaped baffles (4) can form a relatively closed annular seal between the grouting pipe (3) and the exploration hole wall.

2. The exploration hole sealing structure according to claim 1, characterized in that: The support plate (1) has a recessed groove (9) at its center. A vertically arranged connecting pipe (7) is provided in the recessed groove (9). The inner circumference of the connecting pipe (7) is provided with an internal thread that matches the grouting pipe (3). The outer circumference of the upper part of the connecting pipe (7) is provided with an external thread. A cover (8) is installed on the external thread. The cover (8) is completely located in the recessed groove (9). A groove (10) is provided on the cover (8). A hinged pull ring (11) that can be flipped is installed in the groove (10).

3. The exploration hole sealing structure according to claim 1, characterized in that: The inner circumference of the through hole (6) is provided with several inclined upward limiting teeth (12). The pull rope (5) can pass through the bottom of the through hole (6) upward. The limiting teeth (12) can restrict the pull rope (5) from moving downward in the through hole (6). A limiting ring (18) is installed at one end of the pull rope (5) that passes through the through hole (6) upward.

4. The exploration hole sealing structure according to claim 1, characterized in that: The fan-shaped baffle (4) has a positioning nail (13) on the arc surface of the end away from the grouting pipe (3).

5. The exploration hole sealing structure according to claim 1, characterized in that: The grouting pipe (3) is hinged to the outer periphery with four circumferentially arranged fan-shaped baffles (4). The grouting pipe (3) is provided with four circumferentially arranged first limiting blocks (14), and a first annular hinge shaft (15) is installed between the four sets of first limiting blocks (14). The grouting pipe (3) below the first annular hinge shaft (15) is provided with four circumferentially arranged second limiting blocks (16), and a second annular hinge shaft (17) is installed between the four sets of second limiting blocks (16). The first limiting blocks (14) and... The second limiting blocks (16) are arranged in an alternating manner, with two fan-shaped baffles (4) installed on the first annular hinge shaft (15) and the other two fan-shaped baffles (4) installed on the second annular hinge shaft (17). The fan-shaped baffles (4) on the first annular hinge shaft (15) and the fan-shaped baffles (4) on the second annular hinge shaft (17) are arranged in an alternating overlapping manner. When the pull rope (5) drives the fan-shaped baffles (4) to flip upward, the arc surface on the inner side of the fan-shaped baffles (4) is always in contact with the outer periphery of the grouting pipe (3).

Images