Foundation settlement deformation monitoring device

Abstract

This invention relates to the field of foundation settlement monitoring technology, specifically addressing the problem of uneven settlement around building foundations. The deformation monitoring device is strip-shaped and includes an air belt and several deformation detection units. Each deformation detection unit includes a pressure cylinder, a push rod, and a pressure measuring cylinder. The push rod is installed inside the air chamber of the pressure cylinder. The top of the pressure cylinder has an air inlet connecting to the air chamber, and the pressure cylinder is connected to the air belt through its air inlet. The pressure measuring cylinder has an air chamber inside, and a pressure measuring element is installed inside the air chamber. The bottom end of the pressure measuring element passes through the air belt and connects to the top of the piston. Adjacent pressure measuring cylinders are connected to their air chambers through pipes. This invention uses the high air pressure in the air belt to push the push rod downwards in conjunction with foundation settlement. During the downward movement of the push rod, the pressure measuring element also moves downwards, causing a decrease in air pressure inside the pressure measuring cylinder, thereby determining that settlement has occurred around the building foundation.

Description

Technical Field

[0001] This invention relates to the field of foundation settlement monitoring technology, specifically to a foundation settlement deformation monitoring device. Background Technology

[0002] Before the construction of buildings and geotechnical structures, the foundation already contains self-weight stress caused by the soil's own weight. The loads of buildings and geotechnical structures are transferred to the foundation through the bottom surface of the foundation or embankment, changing the original stress state of the natural soil layers. Under the action of additional triaxial stress components, vertical, lateral, and shear deformations occur in the foundation, leading to vertical and lateral displacements at various points. The vertical deformation of the foundation surface is called foundation settlement.

[0003] Storage tank structures are widely used in industries such as petroleum, chemical, and power. Large storage tanks built on soft soil foundations will experience various settlement deformations, including uniform settlement of the entire tank, dish-shaped settlement of the bottom plate, overall tilting settlement of the tank (also known as planar tilting), and uneven settlement around the tank (also known as non-planar tilting). Among these, uneven settlement around the tank has the most adverse impact on the structure. Analysis of numerous storage tank engineering accidents at home and abroad shows that uneven foundation settlement leading to tank failure is one of the main causes of accidents.

[0004] Chinese patent CN108592871A discloses a storage tank foundation settlement monitoring device and system. When the foundation of the storage tank to be tested settles, the first end of the transmission cable is driven downward along with the settlement of the foundation of the storage tank to be tested, and is driven horizontally towards the ground. The slider slides along with the transmission cable moving horizontally towards the ground. The fiber optic sensor detects the light signal reflected from the end face of the second end of the slider after it slides. The settlement displacement of the foundation of the storage tank to be tested can be determined based on the light signal.

[0005] However, this patent cannot detect uneven settlement around the building foundation. Figure 1 As shown, because a building is a formed structure with a certain degree of integrity, when uneven settlement (also known as non-planar tilt) occurs around the building, the building can still remain temporarily stable on the foundation. However, if the settlement range of the foundation gradually increases, the contact area between the building and the ground will continuously decrease, which will directly lead to cracking, tilting, or even destruction of the building. At this time, the danger will be greatly amplified. To address this problem, a foundation settlement deformation monitoring device needs to be proposed. Summary of the Invention

[0006] To address the technical problem of uneven settlement around the foundation of a building.

[0007] This application provides a foundation settlement deformation monitoring device. The deformation monitoring device is strip-shaped and includes an air belt and several deformation detection units. Each deformation detection unit includes a pressure cylinder, a push rod, and a pressure measuring cylinder. The pressure cylinder has an air chamber inside, the push rod is installed inside the air chamber of the pressure cylinder, a piston is provided at the top of the push rod, and the bottom part of the push rod is exposed outside the pressure cylinder.

[0008] The pressure cylinder has an air inlet at the top that connects to the air chamber. The pressure cylinder is connected to the air belt through its air inlet. The air belt is made of flexible material and can deliver gas to the air chambers of several pressure cylinders. The air belt is equipped with a first pressure gauge and a valve.

[0009] The number and position of the pressure testing cylinders correspond one-to-one with the pressure cylinders. The pressure testing cylinder has an air chamber inside, and a pressure measuring element is installed in the air chamber. The bottom end of the pressure measuring element passes through the air belt and is connected to the top of the piston. Adjacent pressure testing cylinders are connected to each other through pipes. A second pressure gauge can be installed on any pressure testing cylinder.

[0010] Preferably, the pressure measuring element includes a plug cylinder, which is located inside the air chamber of the pressure measuring cylinder and is slidably sealed to the pressure measuring cylinder. A first elastic element is sleeved on the plug cylinder, which is used to push the plug cylinder to fill the air chamber of the pressure measuring cylinder.

[0011] Preferably, the top of the plug cylinder is provided with a scale rod for detecting the foundation settlement height, and the scale rod is exposed outside the pressure measuring cylinder.

[0012] Preferably, a sleeve is provided at the bottom end of the plug cylinder, and a locking rod is provided inside the push rod. The bottom end of the locking rod is exposed outside the bottom end of the push rod. When the bottom end of the locking rod is under pressure, the locking rod is fixedly connected to the sleeve.

[0013] Preferably, a second elastic element is sleeved at the bottom end of the locking rod. The second element is used to push the locking rod down. The two ends of the locking rod pass through the piston and the push rod, respectively. A protrusion is provided on the locking rod. A guide groove is opened on the inner wall of the push rod. The protrusion is located inside the guide groove. A tooth is provided at the top end of the locking rod. A number of tooth grooves are arranged on the inner wall of the sleeve. When the protrusion of the locking rod is at one end of the guide groove, the protrusion engages with the tooth groove of the sleeve. When the protrusion of the locking rod is at the other end of the guide groove, the protrusion disengages from the tooth groove of the sleeve.

[0014] Preferably, the bottom of the pressure cylinder is provided with a pressure relief port, which can ensure that there is no air pressure resistance during the piston's downward movement.

[0015] Preferably, a support plate is provided at the air inlet at the top of the pressure cylinder, a locking rod passes through the support plate and is slidably connected to it, and the support plate is provided with an opening for communication between the air belt and the pressure cylinder.

[0016] Preferably, adjacent pressure cylinders are connected by chains.

[0017] The beneficial effects of this invention compared to the prior art are:

[0018] This application uses high air pressure within the air belt to push the top rod downwards in conjunction with foundation settlement. During the downward movement of the top rod, the pressure measuring element also moves downwards, causing a decrease in air pressure within the pressure measuring cylinder. This allows for the detection of settlement around the building foundation, achieving the goal of detecting foundation settlement at any location around the building and solving the problem of uneven settlement around the building foundation. Attached Figure Description

[0019] Figure 1 A schematic diagram of settlement around the building foundation;

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the non-working state of the present invention;

[0022] Figure 4 This is a schematic diagram of the non-working state of the present invention on an uneven surface;

[0023] Figure 5 This is a schematic diagram of the working state of the present invention on an uneven surface;

[0024] Figure 6 This is a schematic diagram of the first working state of the present invention when settlement occurs on uneven ground.

[0025] Figure 7 This is a schematic diagram of the second working state of the present invention when settlement occurs on uneven ground.

[0026] Figure 8 for Figure 4 Enlarged view of point A;

[0027] Figure 9 This is a schematic diagram of the internal structure of the pressure cylinder and ejector pin of the present invention;

[0028] Figure 10 This is a schematic diagram of the internal structure of the ejector pin of the present invention;

[0029] Figure 11 This is a front view of the locking rod of the present invention.

[0030] The numbers on the map are:

[0031] 1-Air belt; 1a-Second air pressure gauge; 1b-Valve;

[0032] 2-Deformation monitoring unit;

[0033] 3-Pressure cylinder; 3a-Pressure relief port; 3b-Support plate;

[0034] 4-Push rod; 4a-Piston; 4b-Locking rod; 4b1-Second elastic element; 4b2-Protrusion; 4b3-Protrusion tooth; 4c-Guide groove;

[0035] 5-Pressure measuring cylinder; 5a-First air pressure gauge;

[0036] 6-Pressure measuring element; 6a-Plug cylinder; 6a1-Scale rod; 6b-First elastic element; 6c-Sleeve; 6c1-Groove; 7-Chain. Implementation

[0037] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0038] like Figures 1 to 3 and Figure 9 As shown, a foundation settlement deformation monitoring device is a strip-shaped device that can be wound onto a reel for storage when not in operation. The deformation monitoring device includes an air belt 1 and several deformation monitoring units 2. Each deformation monitoring unit 2 includes a pressure cylinder 3, a push rod 4, and a pressure measuring cylinder 5. The pressure cylinder 3 has an air chamber inside. The push rod 4 is installed inside the air chamber of the pressure cylinder 3 and is slidably connected to the pressure cylinder 3. A piston 4a is provided at the top of the push rod 4. The diameter of the piston 4a is the same as the inner diameter of the air chamber of the pressure cylinder 3. The bottom part of the push rod 4 is exposed outside the pressure cylinder 3. Adjacent pressure cylinders 3 are connected by a chain 7.

[0039] The pressure cylinder 3 has a pressure relief port 3a at the bottom. The pressure relief port 3a can ensure that there is no air pressure resistance when the piston 4a moves down. The pressure cylinder 3 has an air inlet at the top that connects to the air chamber. The pressure cylinder 3 is connected to the air belt 1 through its air inlet. The air belt 1 is made of flexible material. The air belt 1 can deliver gas to the air chamber of several pressure cylinders 3. The air belt 1 is equipped with a first pressure gauge 5a and a valve 1b.

[0040] The number and position of the pressure measuring cylinders 5 correspond one-to-one with the pressure cylinders 3. The pressure measuring cylinder 5 has an air chamber inside, and a pressure measuring element 6 is installed in the air chamber of the pressure measuring cylinder 5. The pressure measuring element 6 is slidably sealed to the pressure measuring cylinder 5. The bottom end of the pressure measuring element 6 passes through the air belt 1 and is connected to the top of the piston 4a. The air chambers of adjacent pressure measuring cylinders 5 are connected by pipes. A second pressure gauge 1a can be installed on any pressure measuring cylinder 5.

[0041] Specifically, in order to detect foundation settlement at any location around the building, the staff unfolds the strip-shaped deformation monitoring device and installs it around the building. The pressure cylinder 3 and pressure measuring cylinder 5, located above and below the air belt 1, need to be fixedly connected to the building. During the installation process, it is necessary to control the horizontal height of each deformation monitoring unit 2 to be consistent. After the installation is completed, the bottom end of the top rod 4 of each deformation monitoring unit 2 should be in contact with the ground. Then, the valve 1b needs to be opened to supply air to the inside of the air belt 1 to ensure that the inside of the air belt 1 is under high pressure. The air pressure can be observed by the change in the value of the first air pressure gauge 5a during the air supply process. Even if the sealing measures are good, the air pressure inside the air belt 1 may still leak a little during long-term use. Therefore, it is necessary to pressurize the air belt 1 after the value of the first air pressure gauge 5a drops or after a certain time interval.

[0042] When foundation settlement occurs at any location around the building, the top rod 4 at the settlement point will move downwards. Specifically, after the top rod 4 of the deformation monitoring unit 2 at the settlement point loses its support below, the piston 4a is pushed by air pressure on its top and the top rod 4 itself is lowered. During the descent of the top rod 4, it will pull the pressure measuring element 6 down with it. During the descent, the pressure measuring element 6 will be continuously exposed to the pressure measuring cylinder 5, and the gas space inside the air chamber of the pressure measuring cylinder 5 will expand, thereby causing the air pressure in the air chamber of the pressure measuring cylinder 5 to decrease. Since the air chambers between all the pressure measuring cylinders 5 are connected in sequence, the second pressure gauge 1a can immediately detect the decrease in air pressure at any location. When the staff receives the prompt information from the second pressure gauge 1a, they can check the settlement point around the building.

[0043] like Figures 4 to 11 As shown, in some embodiments, the pressure measuring element 6 includes a plug cylinder 6a, which is located inside the air chamber of the pressure measuring cylinder 5 and is slidably sealed to the pressure measuring cylinder 5. A first elastic element 6b is sleeved on the plug cylinder 6a. The first elastic element 6b is a spring, but not limited to it. The first elastic element 6b is used to push the plug cylinder 6a to fill the air chamber of the pressure measuring cylinder 5. A scale rod 6a1 for detecting the foundation settlement height is provided on the top of the plug cylinder 6a. The scale rod 6a1 passes through the outside of the pressure measuring cylinder 5.

[0044] A locking rod 4b is installed inside the push rod 4, with its bottom end exposed above the bottom of the push rod 4. A sleeve 6c is installed at the bottom of the plug cylinder 6a. When the bottom of the locking rod 4b is not under pressure, the locking rod 4b is slidably connected to the sleeve 6c. A second elastic element 4b1 is fitted onto the bottom of the locking rod 4b. The second elastic element 4b1 is a spring, but not limited to it. The second element is used to push the locking rod 4b down. The two ends of the locking rod 4b pass through the piston 4a and the push rod 4, respectively. A protrusion 4b2 is provided on the locking rod 4b. The inner wall of the push rod 4... A guide groove 4c is provided, which spirals along the axis of the top rod 4 and rotates 180 degrees. Inside the guide groove 4c, the protrusion 4b2 is located. The top of the locking rod 4b is provided with a protruding tooth 4b3. The inner wall of the sleeve 6c is provided with several toothed grooves 6c1. When the protrusion 4b2 of the locking rod 4b is at one end of the guide groove 4c, the protrusion 4b2 engages with the toothed grooves 6c1 of the sleeve 6c. When the protrusion 4b2 of the locking rod 4b is at the other end of the guide groove 4c, the protrusion 4b2 disengages from the toothed grooves 6c1 of the sleeve 6c.

[0045] A support plate 3b is provided at the air inlet at the top of the pressure cylinder 3. The locking rod 4b passes through the support plate 3b and is slidably connected to it. Multiple openings are arranged around the support plate 3b for the air belt 1 to communicate with the pressure cylinder 3.

[0046] Specifically, since the ground around the building foundation cannot be guaranteed to be completely flat, in order to solve the problem of monitoring foundation settlement and deformation under uneven ground conditions, after each deformation monitoring unit 2 of the deformation monitoring device is installed with the building, each locking rod 4b at the bottom of the top rod 4 is in contact with the ground. Then, valve 1b needs to be opened to supply air into the air belt 1, thereby putting the air belt 1 into a high-pressure state. At this time, the piston 4a is pushed by the air pressure to its top, causing the top rod 4 to descend further. During the further descent of the top rod 4, since the top rod 4 can only slide longitudinally and cannot rotate, the locking rod 4b and the top rod... 4 is a dynamic sealing connection that can both slide and rotate. Therefore, during the further descent of the top rod 4, the guide groove 4c on the inner wall of the top rod 4 will drive the locking rod 4b to rotate 180 degrees through the protrusion 4b2. After the locking rod 4b completes the rotation, the protruding tooth 4b3 at the top of its end engages with the tooth groove 6c1 on the inner wall of the sleeve 6c. At this time, the top rods 4 of different deformation monitoring units 2 come into contact with and fit the ground at different heights. Furthermore, when the foundation settles, since the locking rod 4b and the sleeve 6c form an engaging connection, the top rod 4 can also continue to drive the plug cylinder 6a to descend when it descends in coordination with the ground settlement, thereby causing a drop in air pressure in the pressure measuring cylinder 5.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A foundation settlement and deformation monitoring device, characterized in that, The deformation monitoring device is strip-shaped. The deformation detection device includes an air belt (1) and several deformation detection units. The deformation detection unit includes a pressure cylinder (3), a push rod (4) and a pressure measuring cylinder (5). The pressure cylinder (3) has an air chamber inside. The push rod (4) is installed inside the air chamber of the pressure cylinder (3). The top of the push rod (4) is provided with a piston (4a). The bottom part of the push rod (4) is exposed outside the pressure cylinder (3). The pressure cylinder (3) has an air inlet at the top that connects to the air chamber. The pressure cylinder (3) is connected to the air belt (1) through its air inlet. The air belt (1) is made of flexible material. The air belt (1) can deliver gas to the air chamber of several pressure cylinders (3). The air belt (1) is equipped with a first pressure gauge (5a) and a valve (1b). The number and position of the pressure measuring cylinders (5) correspond one-to-one with the pressure cylinders (3). The pressure measuring cylinders (5) have an air chamber inside. The pressure measuring element (6) is installed in the air chamber of the pressure measuring cylinder (5). The bottom end of the pressure measuring element (6) passes through the air belt (1) and is connected to the top of the piston (4a). The air chambers of adjacent pressure measuring cylinders (5) are connected by pipes. A second pressure gauge (1a) can be installed on any pressure measuring cylinder (5). The pressure measuring component (6) includes a plug cylinder (6a), which is located inside the air chamber of the pressure measuring cylinder (5) and is slidably sealed to the pressure measuring cylinder (5). A first elastic element (6b) is sleeved on the plug cylinder (6a), which is used to push the plug cylinder (6a) to fill the air chamber of the pressure measuring cylinder (5). A sleeve (6c) is provided at the bottom end of the plug (6a), and a locking rod (4b) is provided inside the push rod (4). The bottom part of the locking rod (4b) is exposed outside the bottom end of the push rod (4). When the bottom end of the locking rod (4b) is under pressure, the locking rod (4b) is fixedly connected to the sleeve (6c). A second elastic element (4b1) is sleeved at the bottom end of the locking rod (4b). The second element is used to push the locking rod (4b) down. The two ends of the locking rod (4b) pass through the piston (4a) and the push rod (4) respectively. A protrusion (4b2) is provided on the locking rod (4b). A guide groove (4c) is opened on the inner wall of the push rod (4). The protrusion (4b2) is inside the guide groove (4c). A tooth (4b3) is provided at the top end of the locking rod (4b). A number of tooth grooves (6c1) are arranged on the inner wall of the sleeve (6c). When the protrusion (4b2) of the locking rod (4b) is at one end of the guide groove (4c), the protrusion (4b2) engages with the tooth groove (6c1) of the sleeve (6c). When the protrusion (4b2) of the locking rod (4b) is at the other end of the guide groove (4c), the protrusion (4b2) disengages from the tooth groove (6c1) of the sleeve (6c).

2. The foundation settlement and deformation monitoring device according to claim 1, characterized in that, The top of the plug cylinder (6a) is provided with a scale rod (6a1) for detecting the ground settlement height, and the scale rod (6a1) is exposed outside the pressure measuring cylinder (5).

3. The foundation settlement and deformation monitoring device according to claim 1, characterized in that, The pressure cylinder (3) has a pressure relief port (3a) at the bottom end. The pressure relief port (3a) can ensure that the piston (4a) will not experience air pressure resistance during the downward movement.

4. The foundation settlement and deformation monitoring device according to claim 1, characterized in that, A support plate (3b) is provided at the air inlet at the top of the pressure cylinder (3). A locking rod (4b) passes through the support plate (3b) and is slidably connected to it. An opening is provided on the support plate (3b) for communication between the air belt (1) and the pressure cylinder (3).

5. The foundation settlement and deformation monitoring device according to claim 1, characterized in that, Adjacent pressure cylinders (3) are connected by chains (7).

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