A foundation pit support axial force monitoring device

Abstract

This utility model discloses a foundation pit support axial force monitoring device, including a horizontal steel support and an axial force gauge. The axial force gauge is used to measure the horizontal axial force of the horizontal steel support. It also includes a support head assembly, one end of which is fixed to the horizontal steel support, and the other end is supported on the foundation pit retaining wall. The support head assembly includes a main adjustment mechanism that acts on the axial force gauge. The support head assembly also includes an auxiliary support mechanism or a mounting position for installing the auxiliary support mechanism, used for temporary support of the foundation pit retaining wall. This utility model includes an auxiliary support mechanism or a mounting position for installing the auxiliary support mechanism. When the axial force gauge malfunctions or malfunctions, the foundation pit is temporarily supported by the auxiliary support mechanism or by installing the auxiliary support mechanism at the corresponding mounting position. The axial force cylinder for installing the axial force gauge has a detachable structure, allowing the cylinder to be opened, the axial force gauge to be removed and replaced quickly, and the main adjustment mechanism to be restored to its function.

Description

Technical Field

[0001] This utility model relates to a device for monitoring the axial force of foundation pit support. Background Technology

[0002] Compared to traditional reinforced concrete support structures, steel-supported retaining structures are easier to install and dismantle, faster to construct, and can significantly shorten the construction period. Steel structures can also be reused, reducing material costs. However, in actual construction, because steel-supported retaining components are usually prefabricated, mismatches in installation distances can occur. Furthermore, the construction process for steel-supported retaining structures requires higher precision; improper handling of joints and support structures can lead to foundation pit collapse. Typically, a large number of steel supports are installed in foundation pits. Monitoring the safety of the support structure necessitates the use of numerous axial force gauges and displacement gauges to monitor the horizontal axial force and displacement of the steel supports, thus understanding the overall condition of the foundation pit support and ensuring its safety. Given the large number of monitoring devices, malfunctions and damage are unavoidable. In existing technologies, replacing axial force gauges requires unloading the steel supports; if damage is left unattended, blind spots will appear in the monitoring system. Utility Model Content

[0003] To address the above shortcomings, the purpose of this utility model is to provide an easily replaceable axial force monitoring device for foundation pit steel supports.

[0004] Therefore, this utility model provides a foundation pit support axial force monitoring device, including a horizontal steel support and an axial force gauge. The axial force gauge is used to measure the horizontal axial force of the horizontal steel support. It also includes a support head assembly, one end of which is fixed to the horizontal steel support and the other end is supported on the foundation pit support wall. The support head assembly includes a main adjustment mechanism that acts on the axial force gauge. The support head assembly also includes an auxiliary support mechanism or an installation position for installing the auxiliary support mechanism, for temporarily supporting the foundation pit support wall.

[0005] Furthermore, the main adjustment mechanism includes a base, which is fixed to a horizontal steel support. The main piston rod of the servo system passes through one end of the base and is fixed to the abutment plate. The axial force gauge is installed in the axial force cylinder, which is installed on the abutment plate.

[0006] Furthermore, the axial force cylinder includes a base plate and a cylinder body, the cylinder body is fixed on the base plate, a columnar cavity is provided in the cylinder body, the axial force gauge is installed in the cavity, the base plate is fixed on the abutment plate, and the central axis of the main piston rod, the columnar cavity and the steel support are the same.

[0007] Furthermore, the cavity of the cylinder is open at both ends, one end of the axial force gauge acts on the abutment plate, and the other end protrudes from the cylinder and acts on the foundation pit support wall.

[0008] Furthermore, the cylinder includes two mirror-symmetrical halves, with a fixing plate on one side of the two halves that mates. The fixing plates are detachably fixed and assembled to form the cylinder by bolts and nuts.

[0009] Furthermore, a strip groove is provided on the cylinder wall for fixing the axial force gauge.

[0010] Furthermore, the abutment plate is provided with a through hole, and the auxiliary piston rod of the auxiliary support mechanism can pass through the through hole and be supported on the foundation pit support wall. Both the auxiliary piston rod and the through hole are arranged on the circumference with the central axis of the horizontal steel support as the central axis.

[0011] The cylinder is provided with a groove, which forms the cavity. The opening side of the groove faces the abutment plate, and the top of the cylinder abuts against the foundation pit support wall.

[0012] Furthermore, the axial force gauge is installed in the groove, with one end of the axial force gauge protruding out of the groove, or the abutment plate is provided with a protrusion protruding into the groove and cooperating with the groove. When the protrusion abuts against the axial force gauge, a gap is reserved between the abutment plate and the bottom of the cylinder.

[0013] Furthermore, the abutment plate is provided with a through hole for the auxiliary support mechanism to pass through, and the bottom of the cylinder is provided with a groove aligned with the through hole. The abutment plate is fixed to the bottom of the cylinder by bolts.

[0014] The beneficial technical effects of this utility model are as follows:

[0015] This utility model discloses a foundation pit support axial force monitoring device. The support head assembly includes a main adjustment mechanism, which cooperates with the axial force gauge to support the foundation pit. The support head assembly also includes an auxiliary support mechanism or an installation position for installing the auxiliary support mechanism. When the axial force gauge malfunctions or becomes abnormal, the foundation pit is temporarily supported by the auxiliary support mechanism provided in the support head assembly or by installing the auxiliary support mechanism at the corresponding installation position. The axial force cylinder for installing the axial force gauge adopts a detachable structure. When the auxiliary support mechanism provides temporary support, the main adjustment mechanism retracts, the axial force cylinder is opened, and the axial force gauge is removed and replaced as soon as possible to restore the function of the main adjustment mechanism. Attached Figure Description

[0016] Figure 1 A schematic diagram of a horizontal steel support structure for realizing this utility model;

[0017] Figure 2 A schematic diagram of Embodiment 1 of the support head assembly;

[0018] Figure 3 This is a schematic diagram of Embodiment 2 for the support head assembly.

[0019] Explanation of reference numerals in the attached drawings: 1. Horizontal steel support; 2. Base; 3. Main piston rod; 4. Pit support wall; 5. Auxiliary support mechanism; 6. Abutment plate; 601. Protrusion; 7. Axial force cylinder; 701. Cylinder body; 702. Base plate; 703. Through hole; 704. Groove; 705. Fixing plate; 8. Axial force gauge; 9. Triangular support frame. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] Reference Figures 1 to 3 As shown, the present invention discloses a foundation pit support axial force monitoring device, including a horizontal steel support 1 and an axial force gauge 8. The axial force gauge 8 is used to measure the horizontal axial force of the horizontal steel support 1. It also includes a support head assembly, one end of which is fixed to the horizontal steel support 1 and the other end is supported on the foundation pit support wall 4. The support head assembly includes a main adjustment mechanism that acts on the axial force gauge 8. The support head assembly also includes an auxiliary support mechanism 5 or an installation position for installing the auxiliary support mechanism 5, for temporarily supporting the foundation pit support wall 4. Figure 1 The diagram shows a horizontal steel pipe support structure, with both ends supported on the retaining walls of the foundation pit. The retaining walls can be cement-soil retaining walls, diaphragm walls, etc., with soil surrounding the retaining walls. A pad can be installed between the retaining walls and the horizontal steel support 1. One end of the horizontal steel support 1 has a support head assembly, which is supported by a triangular support frame 9. The main adjustment mechanism of the support head assembly can employ a servo system, typically including a smart jack, which is controlled by an intelligent control system. (Refer to...) Figure 2 As shown, in specific embodiment 1, the jack includes a main piston rod 3, one end of which is fixed to the abutment plate 6. An axial force gauge 8 is installed in an axial force cylinder 7, which is mounted on the abutment plate 6. An auxiliary support mechanism 5 can also be installed on the base 2 of the main adjustment mechanism. The base 2 is fixed to the horizontal steel support 1. The auxiliary support mechanism 5 can be a jack, and the auxiliary support mechanisms 5 are evenly distributed on the circumference with the central axis of the steel support as the central axis. When the axial force gauge 8 needs to be replaced, the pit can be temporarily supported by the auxiliary support mechanism 5. At this time, the axial force cylinder part of the main adjustment mechanism can be disassembled to complete the replacement of the axial force gauge 8. In this embodiment, since only a small number of axial force gauges 8 may need to be replaced, deploying a large number of auxiliary support structures is not economically viable. Therefore, an alternative approach is to pre-drill mounting holes on the base 2. When replacement is needed, the auxiliary support mechanism is then installed on the base 2. In this way, only a small number of auxiliary support mechanisms need to be prepared.

[0022] In the above embodiment 1, referring to Figure 2 As shown, the axial force cylinder 7 includes a base plate 702 and a cylinder 701. The cylinder 701 is fixed to the base plate 702. A cylindrical cavity is provided in the cylinder 701, and the axial force gauge 8 is installed in the cavity. The base plate 702 is fixed to the abutment plate 6 by bolts. The central axes of the main piston rod 3, the cylindrical cavity, and the steel support are the same. The cylindrical cavity of the cylinder 701 is open at both ends. One end of the axial force gauge 8 acts on the abutment plate 6, and the other end protrudes from the cylinder 701 and acts on the foundation pit support wall 4. A strip groove is provided on the cylinder wall of the cylinder 701, which can be used to position and fix the axial force gauge 8 with bolts.

[0023] In the above embodiment 1, referring to Figure 2 As shown, the cylinder 701 is formed by a detachable structure, specifically comprising two mirror-symmetrical halves. Each half includes a semi-cylindrical cylinder body, with a fixing plate 705 on one side of the cylinder body that cooperates with it. The fixing plates 705 are detachably fixed and assembled to form the cylinder 701 by bolts and nuts. In this embodiment, the main adjustment mechanism can not only be used to compensate for the mismatch in distance between the horizontal steel support and the foundation pit support wall 4 and to adjust the prestress, but also to use the hydraulic cylinder of the main adjustment mechanism to drive the main piston rod 3 to retract, so that the axial force cylinder 7 and the axial force gauge 8 are no longer under force. By unscrewing the bolts and nuts, one half can be disassembled, and the axial force gauge 8 can be replaced.

[0024] In the above embodiment 1, referring to Figure 2 As shown, the abutment plate 6 is provided with a through hole 703. The auxiliary piston rod of the auxiliary support mechanism 5 can pass through the through hole 703 and be supported on the foundation pit support wall 4. The auxiliary piston rod and the through hole 703 are both set on the circumference with the central axis of the horizontal steel support 1 as the central axis.

[0025] Reference Figure 3 As shown, Embodiment 2 of this utility model is basically the same as Embodiment 1, except that the structures of the axial force cylinder 7, the axial force gauge 8 and the abutment plate 6 are different. Specifically, a groove 704 is provided inside the cylinder 701, forming a cavity for inserting the axial force gauge 8. The opening side of the groove 704 faces the abutment plate 6. The top of the cylinder 701 abuts against the foundation pit support wall 4. The bottom of the cylinder 701 is fixed to the abutment plate 6 with bolts. A gap is reserved between the abutment plate 6 and the bottom of the cylinder 701.

[0026] In the above embodiment 2, referring to Figure 3 As shown, the axial force gauge 8 is installed in the groove 704, with one end of the axial force gauge 8 protruding out of the groove 704, or the abutment plate 6 is provided with a protrusion 601 that protrudes into the groove 704 and cooperates with the groove 704. When the protrusion 601 abuts against the axial force gauge 8, a gap is reserved between the abutment plate 6 and the bottom of the cylinder 701.

[0027] In the above embodiment 2, referring to Figure 3 As shown, the abutment plate 6 has a through hole 703 for the auxiliary support mechanism 5 to pass through, and the bottom of the cylinder 701 has a groove aligned with the through hole 703. During the replacement of the axial force gauge 8, the auxiliary support mechanism 5 first applies prestress through the through hole 703 into the groove at the bottom of the cylinder 701. The tightening of the bolts on the abutment plate 6 and the bottom of the cylinder 701 is adjusted appropriately, and the pressure of the auxiliary support mechanism 5 is gradually increased. Then, the pressure of the main adjustment mechanism is slowly decreased. The pressurization of the auxiliary support mechanism 5 and the pressure reduction of the main adjustment mechanism are carried out in stages, that is, the applied pressure is divided into several stages. After the auxiliary support mechanism 5 is pressurized to the corresponding stage, it is observed for a certain period of time to ensure that the support is stable and reliable before proceeding to the next stage of adjustment. If any abnormality occurs in the middle, the pressure of the main adjustment mechanism is increased to avoid risks. An openable cover can be provided on the surface of the axial force cylinder. After the auxiliary support mechanism establishes a stable support, the cover on the surface of the axial force cylinder can be opened to replace the axial force gauge.

Claims

1. A device for monitoring axial force of a foundation pit support, comprising a horizontal steel support and an axial force meter for measuring horizontal axial force of the horizontal steel support, characterized in that: It also includes a support head assembly, one end of which is fixed to a horizontal steel support and the other end is supported on the foundation pit retaining wall. The support head assembly includes a main adjustment mechanism that acts on an axial force gauge. The support head assembly also includes an auxiliary support mechanism or an installation position for installing the auxiliary support mechanism for temporary support of the foundation pit retaining wall.

2. The pit support axial force monitoring device according to claim 1, characterized in that: The main adjustment mechanism includes a base, which is fixed to a horizontal steel support. The main piston rod of the servo system passes through one end of the base and is fixed to the abutment plate. The axial force gauge is installed in the axial force cylinder, which is installed on the abutment plate.

3. The pit support axial force monitoring device according to claim 2, characterized in that: The axial force cylinder includes a base plate and a cylinder body. The cylinder body is fixed on the base plate, and a columnar cavity is provided in the cylinder body. The axial force gauge is installed in the cavity. The base plate is fixed on the abutment plate. The central axes of the main piston rod, the columnar cavity, and the steel support are the same.

4. The foundation pit support axial force monitoring device according to claim 3, characterized in that: The cavity of the cylinder is open at both ends. One end of the axial force gauge acts on the abutment plate, and the other end protrudes from the cylinder and acts on the foundation pit support wall.

5. The pit support axial force monitoring device according to claim 4, characterized in that: The cylinder comprises two mirror-symmetrical halves, with a fixing plate on one side of the two halves that mates. The fixing plates are detachably fixed and assembled to form the cylinder by bolts and nuts.

6. A device for monitoring axial forces in a foundation pit support according to any one of claims 3 to 5, characterised in that: The cylinder wall is provided with a strip groove for fixing the axial force gauge.

7. A device for monitoring the axial force of a foundation pit support according to any one of claims 2 to 5, characterized in that: The abutment plate is provided with a through hole, and the auxiliary piston rod of the auxiliary support mechanism can pass through the through hole and be supported on the foundation pit support wall. The auxiliary piston rod and the through hole are both set on the circumference with the central axis of the horizontal steel support as the central axis.

8. The foundation pit support axial force monitoring device according to claim 3, characterized in that: The cylinder is provided with a groove, which forms the cavity. The opening side of the groove faces the abutment plate, and the top of the cylinder abuts against the foundation pit support wall.

9. The pit support axial force monitoring device according to claim 8, characterized in that: The axial force gauge is installed in the groove, with one end of the axial force gauge protruding out of the groove, or the abutment plate has a protrusion that protrudes into the groove and cooperates with the groove. When the protrusion abuts against the axial force gauge, a gap is reserved between the abutment plate and the bottom of the cylinder.

10. The pit support axial force monitoring device according to claim 9, characterized in that: The abutment plate is provided with a through hole for the auxiliary support mechanism to pass through, and the bottom of the cylinder is provided with a groove aligned with the through hole. The abutment plate is fixed to the bottom of the cylinder by bolts.

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