Displacement monitoring device for foundation pit

Abstract

The utility model provides a displacement monitoring device for a foundation pit. The displacement monitoring device comprises a fixed base, a leveling support and a monitoring structure. The fixed base can be fixedly arranged on the bottom face of a foundation pit. The leveling support is arranged on the fixed base, the top of the leveling support is provided with a bearing plane, and the leveling support can adjust the bearing plane so that the bearing plane can be horizontally arranged. The monitoring structure is arranged on the bearing plane, the monitoring structure is provided with a contact end capable of making contact with the side wall of the foundation pit to be monitored, and the monitoring structure can monitor displacement of the side wall of the foundation pit. According to the displacement monitoring device for the foundation pit, it can be guaranteed that the detection structure is perpendicular to the side wall of the foundation pit to be monitored, then the accuracy of monitoring numerical values is guaranteed, the monitoring effect is guaranteed, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation pit monitoring, and in particular relates to a displacement monitoring device for a foundation pit. Background Art

[0002] The foundation pit is a soil pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. The displacement of the foundation pit refers to the displacement of the retaining structure under the pressure difference between the inside and outside due to the unloading of the excavation in the pit during the foundation pit excavation, which in turn causes the deformation of the soil outside the retaining structure, causing the soil outside the foundation pit or the building (structure) to settle and move, usually the side wall of the foundation pit moves toward the inside of the foundation pit. Therefore, monitoring devices should be used for real-time monitoring during the foundation pit excavation construction process.

[0003] In the prior art, the monitoring device usually includes a base fixed on the bottom surface of the foundation pit, a support frame arranged on the base, and a monitoring module located on the top of the support frame. The monitoring module has a sliding rod that can contact the side wall of the foundation pit. However, the base is generally fixed on the bottom surface of the foundation pit by long positioning nails. Affected by the unevenness of the bottom surface of the foundation pit and the hammering of the long positioning nails, the base and the support frame cannot ensure the horizontality. At this time, there is a certain angle between the moving direction of the sliding rod in the monitoring module and the normal of the side wall of the foundation pit, so that the data measured by the sliding rod is larger than the actual measurement value, and the fixed position of the base has great limitations, resulting in poor monitoring effect and poor practicality. Utility Model Content

[0004] The embodiment of the utility model provides a displacement monitoring device for a foundation pit, aiming to solve the problem of poor practicality of the existing foundation pit displacement monitoring device due to the monitoring direction of the monitoring module being unable to be consistent with the normal direction of the foundation pit side wall.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a displacement monitoring device for a foundation pit, comprising:

[0006] A fixed base, used for being fixed on the bottom surface of the foundation pit;

[0007] A leveling bracket is arranged on the fixed base, the top of the leveling bracket has a bearing plane, and the leveling bracket is used to adjust the bearing plane so that the bearing plane is arranged horizontally;

[0008] A monitoring structure is arranged on the bearing plane, wherein the monitoring structure has a contact end that can contact the side wall of the foundation pit to be monitored, and the monitoring structure is used to monitor the displacement of the side wall of the foundation pit.

[0009] In a possible implementation, the leveling bracket includes:

[0010] A column, which is vertically arranged with respect to the fixed base and has a bottom end fixed on the fixed base;

[0011] A fixed circular plate, fixedly mounted on the top of the column and arranged parallel to the fixed base;

[0012] A movable circular plate is located above the fixed circular plate and is universally rotatably connected to the fixed circular plate through a connecting structure, and the top end surface of the movable circular plate is the bearing plane;

[0013] The adjusting structure is arranged on the fixed circular plate and contacts the movable circular plate, and is used for adjusting the horizontality of the movable circular plate.

[0014] In a possible implementation, the connection structure includes:

[0015] A fixed shaft, fixed on the fixed circular plate and coaxially arranged with the fixed circular plate;

[0016] The spherical bearing comprises an outer ring and an inner ring which is universally rotatable with the outer ring. The outer ring is fixedly arranged at the bottom end of the movable circular plate, and the inner ring is fixedly connected with the fixed shaft.

[0017] In a possible implementation, the adjustment structure includes three adjustment screws, each of which is arranged in a ring-shaped interval around the axis of the fixed circular plate, and each of the adjustment screws is arranged parallel to the length direction of the column, each of the adjustment screws is threadedly connected to the threaded hole set on the fixed circular plate, and the top end passes through the fixed circular plate and abuts against the bottom end surface of the movable circular plate.

[0018] In a possible implementation manner, the top end of each adjusting screw has a spherical abutment portion.

[0019] In a possible implementation, the fixed base includes:

[0020] There are two transverse rods, which are arranged in parallel and spaced apart for the leveling bracket to be installed;

[0021] There are two longitudinal rods, which are parallel and spaced apart at the two ends of the two transverse rods and are perpendicular to the transverse rods. Both ends of each longitudinal rod extend outward, and each longitudinal rod is provided with a plurality of positioning holes for inserting long positioning nails.

[0022] In a possible implementation, the monitoring structure includes:

[0023] A square tube is fixedly mounted on the bearing plane and has a tube cavity. Both ends of the square tube are provided with sliding holes communicating with the tube cavity. The axes of the two sliding holes are arranged parallel to the bearing plane.

[0024] A sliding column is slidably arranged in the cylindrical cavity, and both ends of the sliding column extend outward after passing through the sliding hole, and one end of the sliding column is the contact end;

[0025] A spring is located in the cylinder cavity and sleeved on the slide column, one end of the spring abuts against the inner wall of the cylinder cavity, and the other end abuts against an abutment ring provided on the slide column, and the spring is used to bounce the slide column so that the slide column maintains a tendency to continuously contact the side wall of the foundation pit;

[0026] A reference plate, fixed on the outer edge of the abutment ring;

[0027] The infrared distance measuring sensor is fixedly arranged in the cylindrical cavity and has a laser emitting end facing the corresponding reference plate. The infrared distance measuring sensor is used to measure the position change value of the reference plate.

[0028] In this implementation, the fixed base is fixed on the bottom surface of the foundation pit, which can ensure that it can stably support the leveling bracket and the monitoring structure, thereby ensuring the monitoring effect to a certain extent. The adjustable bracket can adjust the horizontality of the top bearing plane, thereby ensuring that the detection structure is perpendicular to the side wall of the foundation pit to be monitored, which can ensure the accuracy of the monitoring value and the monitoring effect, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a displacement monitoring device for a foundation pit provided by an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the structure of a fixed base and a leveling bracket of a displacement monitoring device for a foundation pit provided in an embodiment of the utility model;

[0031] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the displacement monitoring device for a foundation pit provided in the embodiment;

[0032] Description of reference numerals:

[0033] 10. Fixed base; 11. Horizontal rod; 12. Longitudinal rod;

[0034] 20. Leveling bracket; 21. Column; 22. Fixed circular plate; 23. Movable circular plate; 24. Adjustment structure; 25. Connection structure; 251. Fixed shaft; 252. Spherical bearing;

[0035] 30. Monitoring structure; 31. Square tube; 32. Sliding column; 33. Spring; 34. Abutment ring; 35. Reference plate; 36. Infrared ranging sensor. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Please also read Figure 1 and Figure 2 , the displacement monitoring device for foundation pit provided by the utility model is now described. The displacement monitoring device for foundation pit includes a fixed base 10, a leveling bracket 20 and a monitoring structure 30. The fixed base 10 can be fixed on the bottom surface of the foundation pit. The leveling bracket 20 is arranged on the fixed base 10, and the top of the leveling bracket 20 has a bearing plane, and the leveling bracket 20 can adjust the bearing plane so that the bearing plane is set horizontally. The monitoring structure 30 is arranged on the bearing plane, and the monitoring structure 30 has a contact end that can contact the side wall of the foundation pit to be monitored, and the monitoring structure 30 can monitor the displacement of the side wall of the foundation pit.

[0038] Compared with the prior art, the displacement monitoring device for foundation pit provided in this embodiment has a fixed base 10 fixed on the bottom surface of the foundation pit, which can ensure that it stably supports the leveling bracket 20 and the monitoring structure 30, thereby ensuring the monitoring effect to a certain extent. The adjusting bracket can adjust the horizontality of the top bearing plane, thereby ensuring that the detection structure is perpendicular to the side wall of the foundation pit to be monitored, which can ensure the accuracy of the monitoring value and the monitoring effect, and has strong practicality.

[0039] In some embodiments, the leveling bracket 20 may be used as follows: Figure 2 See the structure shown. Figure 2 The leveling bracket 20 includes a column 21, a fixed circular plate 22, a movable circular plate 23 and an adjustment structure 24. The column 21 is vertically arranged with respect to the fixed base 10, and the bottom end is fixedly arranged on the fixed base 10. The fixed circular plate 22 is fixedly arranged at the top of the column 21 and is arranged parallel to the fixed base 10. The movable circular plate 23 is located above the fixed circular plate 22, and is universally rotatably connected with the fixed circular plate 22 through a connecting structure 25, and the top end surface of the movable circular plate 23 is a bearing plane. The adjustment structure 24 is arranged on the fixed circular plate 22, and is in contact with the movable circular plate 23, and can adjust the horizontality of the movable circular plate 23.

[0040] The column 21 and the fixed circular plate 22 can ensure that the monitoring module has a certain height and can also ensure stable support. By adjusting the movable circular plate 23 of the universal connection of the connecting structure 25 through the adjusting structure 24, the horizontality of the movable circular plate 23 can be ensured, and then the horizontality of the monitoring structure 30 can be ensured, which can ensure the monitoring effect.

[0041] This structure can avoid selecting the position of the fixed base 10 in advance, and can trim the selected position, which can reduce the workload and directly select any position for monitoring.

[0042] In some embodiments, the connection structure 25 may be configured as follows: Figure 3 See the structure shown. Figure 3 The connection structure 25 includes a fixed shaft 251 and a joint bearing 252. The fixed shaft 251 is fixed on the fixed circular plate 22 and is coaxially arranged with the fixed circular plate 22. The joint bearing 252 has an outer ring and an inner ring that is universally rotatable with the outer ring. The outer ring is fixed at the bottom end of the movable circular plate 23, and the inner ring is fixedly connected to the fixed shaft 251.

[0043] The monitoring structure 30 and the side wall of the foundation pit are involved in contact measurement, so the monitoring structure 30 needs to ensure that the sliding parts inside it are vertically arranged with the side wall of the foundation pit. At this time, the movable circular plate 23 after horizontal adjustment can be rotated by the joint bearing 252, thereby ensuring that the sliding direction of the sliding parts is perpendicular to the side wall of the foundation pit. The structure is simple, easy to operate, and can ensure the monitoring effect.

[0044] In some embodiments, the adjustment structure 24 may be implemented as follows: Figure 1 See the structure shown. Figure 1 The adjustment structure 24 includes three adjustment screws, each of which is arranged at an annular interval around the axis of the fixed circular plate 22, and each of the adjustment screws is arranged parallel to the length direction of the column 21. Each of the adjustment screws is threadedly connected to a threaded hole set on the fixed circular plate 22, and the top end passes through the fixed circular plate 22 and abuts against the bottom end surface of the movable circular plate 23.

[0045] The three adjusting screws can ensure that the horizontality of the movable circular plate 23 can be adjusted, and the structure is simple, the operation is convenient, and the practicability is strong.

[0046] In some embodiments, the adjustment structure 24 may be implemented as follows: Figure 1 See the structure shown. Figure 1 The top end of each adjusting screw rod has a spherical abutment portion. The arrangement of the spherical abutment portion can ensure that the friction with the movable circular plate 23 is reduced, making the operation easier.

[0047] In some embodiments, the fixed base 10 may be Figure 2 See the structure shown. Figure 2The fixed base 10 includes a transverse rod 11 and a longitudinal rod 12. Two transverse rods 11 are provided, and the two transverse rods 11 are arranged in parallel and spaced apart for the installation of the leveling bracket 20. Two longitudinal rods 12 are provided, and the two longitudinal rods 12 are arranged in parallel and spaced apart at both ends of the two transverse rods 11, and are arranged perpendicular to the transverse rods 11, and both ends of each longitudinal rod 12 extend outward, and each longitudinal rod 12 is provided with a plurality of positioning holes for inserting long positioning nails.

[0048] The frame structure formed by the combination of the transverse rod 11 and the longitudinal rod 12 can ensure the increase of the contact area with the bottom surface of the foundation pit, thereby ensuring the overall stability. In addition, the structure is simple and easy to manufacture. Through the positioning hole, the long positioning pin can be directly inserted into the soil at the bottom surface of the foundation pit to further ensure stability.

[0049] In some embodiments, the monitoring structure 30 may be implemented as follows: Figure 1 See the structure shown. Figure 1 The monitoring structure 30 includes a square tube 31, a sliding column 32, a spring 33, a reference plate 35 and an infrared distance sensor 36. The square tube 31 is fixed on the bearing plane and has a tube cavity. Both ends of the square tube 31 are provided with sliding holes connected to the tube cavity, and the axes of the two sliding holes are arranged parallel to the bearing plane. The sliding column 32 is slidably arranged in the tube cavity, and both ends extend outward after passing through the sliding holes. One end of the sliding column 32 is a contact end. The spring 33 is located in the tube cavity and is sleeved on the sliding column 32. One end of the spring 33 abuts against the inner wall of the tube cavity, and the other end abuts against the abutment ring 34 arranged on the sliding column 32. The spring 33 can bounce the sliding column 32 so that the sliding column 32 maintains a tendency to continuously contact the side wall of the foundation pit. The reference plate 35 is fixed on the outer edge of the abutment ring 34. The infrared distance sensor 36 is fixed in the tube cavity and has a laser emitting end corresponding to the reference plate 35. The infrared distance sensor 36 can measure the position change value of the reference plate 35.

[0050] One end of the slide post 32 is in contact with the side wall of the foundation pit. When the side wall of the foundation pit is displaced, the slide post 32 is pushed to move, thereby compressing the spring 33. At this time, the reference plate 35 moves synchronously with the slide post 32, thereby shortening the distance from the infrared distance sensor 36 to the reference plate 35. The displacement change value is the displacement of the side wall of the foundation pit. The setting of the infrared distance sensor 36 can ensure the accurate measurement of the displacement, with higher accuracy, and facilitate the timely analysis and processing of data.

[0051] The arrangement of the square tube 31 is mainly to facilitate the fixed connection with the bearing plane.

[0052] It should be noted that a controller and a wireless module electrically connected to the infrared ranging sensor 36 need to be set in the barrel cavity to ensure technical processing of the data, and the data is technically sent to the terminal to ensure that the staff obtains the displacement in real time. This technology is existing technology and will not be repeated here.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A displacement monitoring device for foundation pit, characterized in that: include: A fixed base, used for being fixed on the bottom surface of the foundation pit; A leveling bracket is arranged on the fixed base, the top of the leveling bracket has a bearing plane, and the leveling bracket is used to adjust the bearing plane so that the bearing plane is arranged horizontally; A monitoring structure is arranged on the bearing plane, wherein the monitoring structure has a contact end that can contact the side wall of the foundation pit to be monitored, and the monitoring structure is used to monitor the displacement of the side wall of the foundation pit.

2. The displacement monitoring device for foundation pit according to claim 1, characterized in that: The leveling bracket comprises: A column, which is vertically arranged with respect to the fixed base and has a bottom end fixed on the fixed base; A fixed circular plate, fixedly mounted on the top of the column and arranged parallel to the fixed base; A movable circular plate is located above the fixed circular plate and is universally rotatably connected to the fixed circular plate through a connecting structure, and the top end surface of the movable circular plate is the bearing plane; The adjusting structure is arranged on the fixed circular plate and contacts the movable circular plate, and is used for adjusting the horizontality of the movable circular plate.

3. The displacement monitoring device for foundation pit according to claim 2, characterized in that: The connection structure comprises: A fixed shaft, fixed on the fixed circular plate and coaxially arranged with the fixed circular plate; The spherical bearing comprises an outer ring and an inner ring which is universally rotatable with the outer ring. The outer ring is fixedly arranged at the bottom end of the movable circular plate, and the inner ring is fixedly connected with the fixed shaft.

4. The displacement monitoring device for foundation pit according to claim 2, characterized in that: The adjustment structure includes three adjusting screws, each of which is arranged in a ring-shaped interval around the axis of the fixed circular plate, and each of the adjusting screws is arranged parallel to the length direction of the column. Each of the adjusting screws is threadedly connected to the threaded hole set on the fixed circular plate, and the top end passes through the fixed circular plate and abuts against the bottom end surface of the movable circular plate.

5. The displacement monitoring device for foundation pit according to claim 4, characterized in that: The top end of each adjusting screw rod is provided with a spherical abutment portion.

6. The displacement monitoring device for foundation pit according to claim 1, characterized in that: The fixed base comprises: There are two transverse rods, which are arranged in parallel and spaced apart for the leveling bracket to be installed; There are two longitudinal rods, which are parallel and spaced apart at the two ends of the two transverse rods and are perpendicular to the transverse rods. Both ends of each longitudinal rod extend outward, and each longitudinal rod is provided with a plurality of positioning holes for inserting long positioning nails.

7. The displacement monitoring device for foundation pit according to claim 1, characterized in that: The monitoring structure includes: A square tube is fixedly mounted on the bearing plane and has a tube cavity. Both ends of the square tube are provided with sliding holes communicating with the tube cavity. The axes of the two sliding holes are arranged parallel to the bearing plane. A sliding column is slidably arranged in the cylindrical cavity, and both ends of the sliding column extend outward after passing through the sliding hole, and one end of the sliding column is the contact end; A spring is located in the cylinder cavity and sleeved on the slide column, one end of the spring abuts against the inner wall of the cylinder cavity, and the other end abuts against an abutment ring provided on the slide column, and the spring is used to bounce the slide column so that the slide column maintains a tendency to continuously contact the side wall of the foundation pit; A reference plate, fixed on the outer edge of the abutment ring; The infrared distance measuring sensor is fixedly arranged in the cylindrical cavity and has a laser emitting end facing the corresponding reference plate. The infrared distance measuring sensor is used to measure the position change value of the reference plate.

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