An osmometer fixing device and its usage method

Abstract

The present invention discloses an osmometer fixing device and its using method, which includes an osmometer chamber and an accessory chamber. The accessory chamber is fixedly arranged on one side of the osmometer chamber. A driving device is fixedly arranged in the accessory chamber. A permeable stone is fixedly arranged in the osmometer chamber. An osmometer is fixedly arranged on one side of the permeable stone. A push-pull cover plate is arranged on the other side of the permeable stone. One side of the push-pull cover plate extends into the accessory chamber through the side wall of the osmometer chamber and is connected to the output end of the driving device. The driving device, the top plate and the push-pull cover plate are added. The top plate and the push-pull cover plate can protect the permeable stone to avoid the pores in the permeable stone being blocked by cement slurry. And water permeable holes are arranged on the top plate. The rubber plug in the water permeable holes is pulled out by driving the push-pull cover plate to move by the driving mechanism, so that the device can work normally. The welding of the fixing device steel reinforcement cage can improve the positioning accuracy and avoid the damage of the osmometer during the concrete pouring process, and improve the survival rate.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel and underground engineering seepage pressure monitoring, and in particular relates to a piezometer fixing device and a use method thereof. Background Art

[0002] In the design, construction and operation of underground projects such as tunnels, water pressure is an external load that cannot be ignored. During the survey and design process, the value of the water pressure load depends on geological survey data and relevant design specifications. However, due to certain objective reasons, the actual water pressure load on underground projects such as tunnels after completion is often inconsistent with the design value, which will cause the actual internal force value of the structure to differ from the design value. Underestimation of the load may cause the structure to be in an unfavorable stress state, thereby affecting its service life. In addition, during the service life of underground structures such as tunnels, extreme precipitation may occur, which will also cause a sudden increase in the water pressure load on the structure, thereby increasing its internal force. Therefore, during the construction process of tunnels and other underground projects, relevant sensors are often embedded in key locations to monitor the external loads of the structure in order to monitor and evaluate the safety of the structure in real time.

[0003] Among the pre-buried sensors, piezometers are a type of sensor device used to measure the magnitude of water pressure loads on underground or underwater buildings. Commonly used piezometers mainly include fiber grating type and vibrating string type. Although there are certain differences in the working principles and characteristics of the two piezometers, both require the collection of water pressure through the osmotic pressure sensing surface. In order to eliminate the influence of soil pressure, a permeable stone is generally provided on the surface of the osmotic pressure sensing surface to block soil particles. During the concrete pouring process, if the piezometer is not protected, it is very easy to cause the pores in the permeable stone on its surface to be blocked by cement slurry, thereby closing the seepage channel, causing the piezometer to fail and unable to collect water pressure. On the other hand, according to the survey, the existing piezometer installation is basically achieved by directly tying it to the steel cage. This method has the disadvantages of low installation and positioning accuracy and easy failure of the piezometer after concrete pouring. Therefore, it is necessary to develop a new type of piezometer fixing device for underground projects such as tunnels to solve these problems. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a piezometer fixing device and a method of using the same, which are mainly used for fixing and installing piezometers for measuring water pressure in tunnel linings or other underground projects. The device and the method of using the same can accurately fix the piezometer on the surface of the structure and can ensure the accuracy and effectiveness of the piezometer in measuring water pressure.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An osmometer fixing device and its usage method, including an osmometer chamber and an accessory chamber. The accessory chamber is fixedly arranged on one side of the osmometer chamber. A driving device is fixedly arranged in the accessory chamber. A permeable stone is fixedly arranged in the osmometer chamber. An osmometer is fixedly arranged on one side of the permeable stone. A push-pull cover plate is arranged on the other side of the permeable stone. One side of the push-pull cover plate penetrates through the side wall of the osmometer chamber and extends into the accessory chamber, and is connected to the output end of the driving device. A top plate is also arranged on one side of the push-pull cover plate. The top plate is provided with permeable holes. Rubber plugs are arranged on the permeable holes, and the rubber plugs are connected to the push-pull cover plate through connecting pieces. When the driving device drives the push-pull cover plate to move, the rubber plugs will be pulled out of the permeable holes by the push-pull cover plate through the connecting pieces.

[0007] Preferably, fixing rings for fixing the permeable stone are arranged on the inner wall of the osmometer chamber, and the number of the fixing rings is two. The permeable stone is located between the two fixing rings.

[0008] With such an arrangement, the permeable stone can be effectively fixed, avoiding the deviation of the permeable stone during installation and causing errors in the detection results.

[0009] Preferably, the sensing end of the osmometer is adjacent to the permeable stone. A bottom plate is arranged on the osmometer chamber at the other end of the osmometer. A cable hole is arranged on the bottom plate.

[0010] With such an arrangement, the osmometer can be fixed and the osmometer chamber can be sealed at the same time.

[0011] Preferably, a buffer interlayer is also arranged between the osmometer and the inner wall of the osmometer chamber.

[0012] With such an arrangement, the influence of external impacts and vibrations on the osmometer can be reduced, avoiding damage to the osmometer.

[0013] Preferably, the driving device includes a motor, a gear and a rack. The rack is fixedly installed on the push-pull cover plate. The motor is fixedly installed in the accessory chamber. The gear is fixedly arranged at the output end of the motor and meshes with the rack.

[0014] Preferably, sliding grooves are arranged on the inner walls of both the accessory chamber and the osmometer chamber. The push-pull cover plate slides in the sliding grooves, and rubber sealing rings are arranged at the joints of the push-pull cover plate with the osmometer chamber and the accessory chamber.

[0015] Preferably, the top plate is fixedly installed on the osmometer chamber and the accessory chamber through bolts.

[0016] With such an arrangement, the entry of muddy water can be effectively avoided to protect the motor and the permeable stone.

[0017] Preferably, both the water-permeable hole and the rubber plug are frustum-shaped. The lower bottom of the water-permeable hole is adjacent to the push-pull cover plate, and the lower bottom of the rubber plug is connected to the push-pull cover plate through a connecting member.

[0018] With such a setting, it can be ensured that when the push-pull cover plate moves from the upper part of the osmometer chamber to the upper part of the accessory chamber, the rubber plug is pulled out through the connecting member, ensuring the smoothness of the water-permeable hole.

[0019] An osmometer fixing device and its using method, the using method comprising the following steps:

[0020] First step, complete the assembly of the fixing device and the osmometer, and check the airtightness of the fixing device;

[0021] Second step, fix the fixing device on the steel reinforcement cage at the osmometer measuring point, and at the same time lead out the cable outside the structure, and then pour concrete;

[0022] Third step, after the concrete structure finishes curing, carry out cable connection;

[0023] Fourth step, finally use the driving device to open the push-pull cover plate to collect data.

[0024] Preferably, in the second step, the osmometer chamber is fixed by welding to the main steel reinforcement on the steel reinforcement cage, and the accessory chamber is fixed by welding to the secondary steel reinforcement, and the height of the top plate is kept consistent with the outer surface of the structure.

[0025] With such a setting, the positioning accuracy can be improved.

[0026] The advantages and positive effects of the present invention are:

[0027] The present invention adds a driving device, a top plate and a push-pull cover plate. Among them, the top plate and the push-pull cover plate can protect the water-permeable stone, the osmometer and the motor, avoiding the pores in the water-permeable stone from being blocked by cement slurry during the concrete pouring and curing processes. And a water-permeable hole is provided on the top plate, and the rubber plug in the water-permeable hole is pulled out by driving the push-pull cover plate to move by a driving mechanism, so that the osmometer can work normally. The welding of the fixing device steel reinforcement cage can improve the positioning accuracy and at the same time avoid the osmometer from being damaged during the concrete pouring process, improving the survival rate. Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic internal structure diagram of the water-permeable holes of the present invention in the unopened state;

[0030] Figure 2 It is a schematic internal structure diagram of the water-permeable holes of the present invention in the opened state.

[0031] The description of the reference numerals is as follows:

[0032] 1. Osmometer chamber; 2. Auxiliary chamber; 3. Fixed ring; 4. Permeable stone; 5. Motor; 6. Gear; 7. Rack; 8. Push-pull cover plate; 9. Slide groove; 10. Osmometer; 11. Bottom plate; 12. Top plate; 13. Water-permeable hole; 14. Rubber plug; 15. Connector; 16. Buffer interlayer; 17. Cable hole; 18. Main fixing rib; 19. Sub-fixing rib. Detailed implementation manners

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0035] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt the conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machines, parts, and equipment all adopt the conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0036] The present invention will be further described below in conjunction with the accompanying drawings:

[0037] Embodiment 1

[0038] As Figure 1 - Figure 2 shown, a piezometer fixing device and its using method include a piezometer chamber 1 and an accessory chamber 2. The accessory chamber 2 is fixedly arranged on one side of the piezometer chamber 1. A driving device is fixedly arranged in the accessory chamber 2. A permeable stone 4 is fixedly arranged in the piezometer chamber 1. One side of the permeable stone 4 is fixedly provided with a piezometer 10. On the other side of the permeable stone 4, a push-pull cover plate 8 is arranged. One side of the push-pull cover plate 8 passes through the side wall of the piezometer chamber 1 and extends into the accessory chamber 2, and is connected to the output end of the driving device. On one side of the push-pull cover plate 8, a top plate 12 is further arranged. A permeable hole 13 is arranged on the top plate 12. A rubber plug 14 is arranged on the permeable hole 13, and the rubber plug 14 is connected to the push-pull cover plate 8 through a connecting member 15. When the driving device drives the push-pull cover plate 8 to move, the rubber plug 14 will be pulled out of the permeable hole 13 by the push-pull cover plate 8 through the connecting member 15.

[0039] Specifically, the permeable stone 4 is fixed in the piezometer chamber 1 through two fixing rings 3. The fixing rings 3 are fixed on the inner wall of the piezometer chamber 1 by welding. The permeable stone 4 is located between the two fixing rings 3. The piezometer 10 is inserted into the piezometer chamber 1 from one end of the piezometer chamber 1, and the bottom plate 11 is fixed by bolts to seal the piezometer chamber 1. At the same time, the cable is led out from the cable hole 17 on the bottom plate 11, and airtight treatment is performed at the joint between the bottom plate 11 and the piezometer chamber 1 and at the gap where the cable passes through the cable hole 17 to prevent water leakage. The piezometric sensing surface of the piezometer 10 is adjacent to the permeable stone 4 during installation. A buffer interlayer 16 is arranged between the side surface of the piezometer 10 and the inner wall of the piezometer chamber 1, which can reduce the influence of external impact and vibration on the piezometer 10 and avoid damage to the piezometer 10.

[0040] Specifically, the driving device includes a motor 5, a gear 6, and a rack 7. The rack 7 is fixedly installed on the push-pull cover plate 8. The bottom of the motor 5 is fixedly installed on the inner bottom of the accessory bin 2 by welding. The gear 6 is fixedly arranged on the output shaft of the motor 5 and meshes with the rack 7, providing power for the movement of the push-pull cover plate 8. Sliding grooves 9 are provided on the inner walls of both the accessory bin 2 and the piezometer bin 1. Driven by the motor 5, the gear 6 rotates and drives the rack 7 to move. The push-pull cover plate 8 moves along the sliding groove 9 from the piezometer bin 1 into the accessory bin 2 following the drive of the rack 7. Rubber sealing rings are provided at the joints where the push-pull cover plate 8 contacts the piezometer bin 1 and the accessory bin 2, which can effectively prevent the entry of muddy water and protect the motor 5 and the permeable stone 4. The top plate 12 is fixedly installed on the piezometer bin 1 and the accessory bin 2 by bolts, and the joints between the top plate 12 and the piezometer bin 1 and the accessory bin are sealed with sealant. The shapes of both the water permeable hole 13 and the rubber plug 14 are frustum-shaped. The lower bottom of the water permeable hole 13 is adjacent to the push-pull cover plate 8, and the lower bottom of the rubber plug 14 is connected to the push-pull cover plate 8 through a connecting piece 15. Since the diameter of the lower bottom of the frustum is larger than that of the upper bottom, it can ensure that when the push-pull cover plate 8 moves, the rubber plug 14 is pulled out through the connecting piece 15, ensuring the smoothness of the water permeable hole 13.

[0041] The working process of this embodiment: First, the staff welds the main fixing bars on the outer wall of the piezometer bin 1, then welds the auxiliary fixing bars to the accessory bin 2. Then, the permeable stone 4 is installed in the piezometer bin 1 through two fixing rings 3, and the motor 5 is fixed in the accessory bin 2. Then, a sealing rubber ring is installed at the junction of the piezometer bin 1, the accessory bin 2, and the push-pull cover plate 8, and the push-pull cover plate 8 is inserted into the sealing rubber ring. While ensuring the sealing between the push-pull cover plate 8 and the accessory bin 2 and the piezometer bin 1, it is also necessary to ensure the smooth translation of the push-pull cover plate 8. Then, the rubber plug 14 is connected to the push-pull cover plate 8 through a connecting piece 15, and the rubber plug 14 is correctly inserted into the water permeable hole 13. Finally, the top plate 12 is fixed above the piezometer bin 1 and the accessory bin 2 by bolts and sealed with sealant. Then, the motor 5 is connected to the push-pull cover plate 8 through the gear 6 and the rack 7, so that when the motor 5 rotates, it can drive the push-pull cover plate 8 to move through the gear 6 and the rack 7. Then, the piezometer 10 is inserted into the piezometer bin 1, and the piezometric sensing surface of the piezometer 10 is adjacent to the permeable stone 4. Moreover, a buffer layer 16 is reserved between the piezometer 10 and the inner wall of the piezometer bin 1 to reduce the impact of external impacts and vibrations on the piezometer 10 and prevent the piezometer 10 from being damaged. Then, the cable is led out from the cable hole 17 of the bottom plate 11, and the bottom plate 11 is installed on the piezometer bin 1 by bolts. Sealing treatments are performed at the joint where the bottom plate 11 contacts the piezometer bin 1 and at the gap where the cable passes through the cable hole 17. After installation, the airtightness of the joints of each component is detected, and it can be used only after meeting the requirements to avoid damage caused by the infiltration of muddy water in the later stage.

[0042] Then, the staff uses the main fixing bars and the auxiliary fixing bars to weld the fixing device to the reinforcement cage at the measurement point. Before welding, it is necessary to check whether the push-pull cover plate 8 is located above the permeable stone 4 and whether the rubber plug 14 has sealed the permeable holes 13. After meeting the requirements, the outer wall of the piezometer chamber 1 is welded to the main fixing bar 18, and the outer wall of the accessory chamber 2 is welded to the auxiliary fixing bar 19. This can ensure the installation accuracy of the piezometer 10. At the same time, the piezometer chamber 1 can prevent the piezometer 10 from being damaged during the concrete pouring process. Moreover, during welding, the height of the fixing device also needs to be adjusted to ensure that the top plate 12 of the fixing device is at the same height as the outer surface of the structure after the concrete pouring is completed. Then, the cables of the piezometer 10 and the motor 5 led out from the cable holes 17 on the bottom plate 11 are respectively connected to the control circuit and the data acquisition system. Finally, after the concrete curing is completed, the staff starts the motor 5 through the control circuit. The push-pull cover plate 8 is opened by the motor 5. After the push-pull cover plate 8 moves, the rubber plug 14 is pulled out of the permeable hole 13 through the connecting piece 15, keeping the permeable hole 13 unobstructed and ensuring that the piezometer 10 can work normally.

[0043] In this embodiment, the piezometer 10 will always remain in the working state after installation and startup, and will monitor the water pressure load on the tunnel or underground structure in real time. The corresponding cover plate and the rubber plug 14 will not be closed again after being opened.

[0044] The above has described a detailed description of an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An osmometer fixing device, characterized in that: It includes a piezometer chamber (1) and an accessory chamber (2). The accessory chamber (2) is fixedly arranged on one side of the piezometer chamber (1). A driving device is fixedly arranged in the accessory chamber (2). A permeable stone (4) is fixedly arranged in the piezometer chamber (1). One side of the permeable stone (4) is fixedly provided with a piezometer (10). On the other side of the permeable stone (4), a push-pull cover plate (8) is arranged. One side of the push-pull cover plate (8) penetrates through the side wall of the piezometer chamber (1) and extends into the accessory chamber (2), and is connected to the output end of the driving device. On one side of the push-pull cover plate (8), a top plate (12) is further arranged. A water permeable hole (13) is arranged on the top plate (12). A rubber plug (14) is arranged on the water permeable hole (13), and the rubber plug (14) is connected to the push-pull cover plate (8) through a connecting piece (15). When the driving device drives the push-pull cover plate (8) to move, the rubber plug (14) will be pulled out of the water permeable hole (13) by the push-pull cover plate (8) through the connecting piece (15); On the inner wall of the piezometer chamber (1), a fixing ring (3) for fixing the permeable stone (4) is arranged, and the number of the fixing rings (3) is two. The permeable stone (4) is located between the two fixing rings (3); The sensing end of the piezometer (10) is adjacent to the permeable stone (4). On the piezometer chamber (1) at the other end of the piezometer (10), a bottom plate (11) is arranged. A cable hole (17) is arranged on the bottom plate (11).

2. The osmometer fixing device according to claim 1, characterized in that: A buffer interlayer (16) is further arranged between the piezometer (10) and the inner wall of the piezometer chamber (1).

3. The osmometer fixing device according to claim 1, characterized in that: The driving device includes a motor (5), a gear (6) and a rack (7). The rack (7) is fixedly installed on the push-pull cover plate (8). The motor (5) is fixedly installed in the accessory chamber (2). The gear (6) is fixedly arranged at the output end of the motor (5) and meshes with the rack (7).

4. The osmometer fixing device according to claim 1, characterized in that: Chute grooves (9) are arranged on the inner walls of both the accessory chamber (2) and the piezometer chamber (1). The push-pull cover plate (8) slides in the chute grooves (9), and rubber sealing rings are arranged at the joints where the push-pull cover plate (8) fits with the piezometer chamber (1) and the accessory chamber (2).

5. The osmometer fixing device according to claim 1, characterized in that: The top plate (12) is fixedly installed on the piezometer chamber (1) and the accessory chamber (2) through bolts.

6. The osmometer fixing device according to claim 1, characterized in that: The shapes of both the water permeable hole (13) and the rubber plug (14) are frustum-shaped. The lower bottom of the water permeable hole (13) is adjacent to the push-pull cover plate (8). The lower bottom of the rubber plug (14) is connected to the push-pull cover plate (8) through a connecting piece (15).

7. A method for using an osmometer fixing device, which refers to an osmometer fixing device described in claim 1, and its usage method It includes the following steps: The first step is to complete the assembly of the fixing device and the piezometer, and check the airtightness of the fixing device; The second step is to fix the fixing device on the steel reinforcement cage at the piezometric measurement point, and at the same time lead the cable out of the structure, and then pour concrete; The third step is to conduct cable connection after the concrete structure finishes curing; In the fourth step, finally, the driving device is used to open the push-pull cover plate (8) for data collection.

8. A method for using an osmotic pressure gauge fixing device according to claim 7, characterized in that: In the second step, the osmometer bin (1) is fixed by welding it to the main fixed reinforcement (18) on the steel reinforcement cage, and the accessory bin (2) is fixed by welding it to the secondary fixed reinforcement (19), and the top plate (12) is kept at the same height as the outer surface of the structure.

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