Foundation pit support deformation monitoring device

Abstract

The invention discloses a foundation pit supporting deformation monitoring device, and relates to the field of foundation pit deformation monitoring, the foundation pit supporting deformation monitoring device comprises a foundation pit supporting pile casing, the two ends of the foundation pit supporting pile casing are respectively provided with a connecting channel, and a movable connecting structure is installed and connected in the connecting channel; the end, away from the foundation pit supporting pile casing, of the movable connecting structure is connected with a supporting connecting base. Each movable connecting structure comprises a movable connecting guide sleeve rod, one end of each movable connecting guide sleeve rod is used for being connected with the supporting connecting base, and the other end of each movable connecting guide sleeve rod is movably connected with the bottom end of a connecting channel formed in the foundation pit supporting pile casing through a movable connecting piece. The periphery of the movable connecting piece is movably provided with monitoring deformation connecting rods used for facilitating monitoring. The monitoring device is simple in structure and convenient to mount and dismount, and can be recycled for multiple times; meanwhile, non-technical personnel can conveniently monitor the deformation condition of the foundation pit in real time at present through the monitoring device, and manpower and cost are saved.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit deformation monitoring, and specifically to a foundation pit support deformation monitoring device. Background Technique

[0002] A foundation pit generally refers to a temporary space excavated in civil engineering and construction engineering for underground structure construction or underground engineering. The excavation of a foundation pit can involve multiple aspects, including: Design: The design of a foundation pit needs to consider factors such as soil type, groundwater level, and the influence of surrounding buildings to ensure construction safety; Support structure: Since the foundation pit is relatively deep, the surrounding soil may collapse, so a support structure is required to maintain the stability of the foundation pit. Common support methods include soil nail walls, anchor rods, steel supports, etc.; De-watering treatment: If there is groundwater in the foundation pit, de-watering measures need to be taken, such as using well point de-watering or pumping methods to prevent water from affecting the foundation pit; Monitoring: During the excavation of the foundation pit, real-time monitoring must be carried out to observe the settlement or displacement of surrounding buildings, roads, pipelines, etc. to ensure construction safety; Safety management: Foundation pit construction has certain risks, so a detailed safety management plan needs to be formulated to ensure the safety of workers and the surrounding environment.

[0003] Foundation construction is the foundation of the entire building. It can be said that the construction of a building foundation pit is related to the construction safety of the entire building.

[0004] Since the foundation pit foundation is constructed underground, the designed foundation needs to be excavated. The underground geological conditions vary, and in order to ensure the safety of the foundation pit excavation construction, it is necessary to monitor the deformation of the foundation of the foundation pit at any time. For traditional detection, surveyors need to monitor according to the design requirements at any time. This not only requires professional personnel to be on site at any time, but also takes a lot of time to set up instruments, which is time-consuming, laborious, and resource-wasting. Summary of the Invention

[0005] The purpose of the present invention is achieved through the following technical solutions: A foundation pit support deformation monitoring device includes a foundation pit support casing. Connecting channels are respectively opened at both ends of the foundation pit support casing. An activity connection structure is installed and connected in the connecting channels. One end of the activity connection structure far from the foundation pit support casing is connected with a support connection seat for supporting on the side wall of the foundation pit; The activity connection structures each include an activity connection guiding sleeve rod. One end of the activity connection guiding sleeve rod is used for connecting with the support connection seat. The other end of the activity connection guiding sleeve rod is movably connected to the bottom end of the connecting channel opened by the foundation pit support casing through an activity connecting piece; Around the movable connecting piece, monitoring deformation connecting rods for convenient monitoring can be movably arranged respectively. One end of the monitoring deformation connecting rod can be movably arranged in a connecting channel opened in the foundation pit support cylinder and is used for movably connecting with the movable connecting piece, and the other end of the monitoring deformation connecting rod can movably pass through the side wall of the foundation pit support cylinder.

[0006] Preferably, the movable connecting piece includes a movable connecting head and a movable connecting ball rod; One end of the movable connecting head away from the connecting channel opened in the foundation pit support cylinder is used for connecting with a movable connecting guide sleeve rod, the other end of the movable connecting head is used for connecting with the movable connecting ball rod, and the movable connecting head is movably limited to the side wall of the connecting channel opened in the foundation pit support cylinder; One end of the movable connecting ball rod away from the movable connecting head is used for movably connecting with the bottom end of the connecting channel opened in the foundation pit support cylinder; The monitoring deformation connecting rods are respectively movably connected with the movable connecting ball rod.

[0007] Preferably, the movable connecting piece further includes movable limit seats for movably hinging the monitoring deformation connecting rods respectively; The movable limit seats are provided with movable chutes. A limit sliding block corresponding to the movable limit seat is arranged at the bottom end of the connecting channel opened in the foundation pit support cylinder where the movable connecting head is located. The movable limit seats can all be movably arranged in the connecting channel opened in the foundation pit support cylinder, and the limit sliding block is slidably adapted to the movable chute.

[0008] Preferably, the diameter of the movable connecting head is larger than the diameter of the movable connecting ball rod; One end of the movable limit seat close to the movable connecting ball rod is provided with a movable hinged connecting rod. One end of the movable hinged connecting rod is used for hinged connection with the movable limit seat through a hinge seat, and the other end of the movable hinged connecting rod is used for movable connection with the movable connecting ball rod through a hinge seat; One end of the monitoring deformation connecting rod close to the movable limit seat is detachably connected with the limit seat by threads.

[0009] Preferably, a deformation spring is movably sleeved on the monitoring deformation connecting rod. One end of the deformation spring is connected with the movable limit seat, and the other end of the deformation spring is used for connecting with the side wall of the connecting channel opened in the foundation pit support cylinder.

[0010] Preferably, a movable guide hole is opened at the bottom end of the connecting channel opened in the foundation pit support cylinder. One end of the movable connecting ball rod away from the movable connecting head is connected with a movable ball head. One end of the movable ball head close to the movable guide hole can movably pass through the movable guide hole, and the movable ball head is movably connected with the foundation pit support cylinder through the movable ball head.

[0011] Preferably, the diameter of the movable ball head is larger than the diameter of the movable connecting ball rod; A conical return spring is sleeved on the movable connecting ball rod; One end of the return spring is used to be connected to the movable connecting ball rod, and the other end of the return spring is used to be connected to the bottom end of the connecting channel opened in the foundation pit support cylinder.

[0012] Preferably, the diameter of the movable connecting head is smaller than the inner diameter of the connecting channel opened in the foundation pit support cylinder; A plurality of movable abutting blocks are respectively connected to the periphery of the movable connecting head, and the movable connecting head is used to be movably limited to the inner side wall of the connecting channel opened in the foundation pit support cylinder through the movable abutting blocks.

[0013] Preferably, movable limit abutting grooves corresponding to the movable abutting blocks are opened on the periphery of the inner side wall of the connecting channel opened in the foundation pit support cylinder, and the movable abutting blocks are respectively movably arranged in the limit abutting grooves, and the movable abutting blocks are movably limited through the limit abutting grooves.

[0014] Preferably, the two side walls of the movable abutting block are movably adapted to the two side walls of the limit abutting groove; There is a gap between the end face on one side of the movable abutting block close to the limit abutting groove and the side face on one side close to the limit abutting groove.

[0015] The beneficial effects of the present invention are as follows: The purpose of the present invention is to provide a foundation pit support deformation monitoring device, which is used to facilitate on-site construction personnel (including non-technical personnel) to monitor the deformation of the foundation pit in real time, so as to ensure the safety of the foundation pit construction site. The monitoring device has a simple structure, is convenient for installation and disassembly, and can be recycled multiple times; at the same time, through this monitoring device, non-technical personnel can conveniently monitor the deformation of the foundation pit in real time, saving manpower and costs. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall connection effect of a foundation pit support deformation monitoring device of the present invention; Figure 2 It is a partially exploded schematic diagram of the connection structure of a foundation pit support deformation monitoring device of the present invention; Figure 3 It is a schematic diagram of the movable connection structure of a foundation pit support deformation monitoring device of the present invention; Figure 4 It is a partially exploded schematic diagram of the movable connection structure of a foundation pit support deformation monitoring device of the present invention; Figure 5 It is a schematic diagram of the connection structure of the movable limit seat of a foundation pit support deformation monitoring device of the present invention; Figure 6 Explosion schematic diagram of the movable limit seat connection structure of a foundation pit support deformation monitoring device according to the present invention; In the figure, 1 - foundation pit support cylinder, 2 - support connection seat, 3 - monitoring deformation connecting rod, 21 - movable connection guiding sleeve rod, 22 - movable connection head, 23 - movable connection ball rod, 24 - movable limit seat, 31 - deformation spring, 221 - movable abutting block, 231 - movable ball head, 232 - return spring, 241 - movable articulated connecting rod. Specific embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] Embodiment 1 As Figures 1 to 6 shown, a foundation pit support deformation monitoring device is used to facilitate on-site construction personnel (including non-technical personnel) to monitor the deformation of the foundation pit in real time, so as to ensure the safety of the foundation pit construction site. The monitoring device provided includes a foundation pit support cylinder 1. Connection channels are respectively opened at both ends of the foundation pit support cylinder 1. A movable connection structure is installed and connected in the connection channels. One end of the movable connection structure away from the foundation pit support cylinder 1 is connected to a support connection seat 2 for supporting on the side wall of the foundation pit; the movable connection structure includes a movable connection guiding sleeve rod 21. One end of the movable connection guiding sleeve rod 21 is used to be connected to the support connection seat 2, and the other end of the movable connection guiding sleeve rod 21 is movably connected to the bottom end of the connection channel opened in the foundation pit support cylinder 1 through a movable connection member; Monitoring deformation connecting rods 3 for facilitating monitoring are respectively movably arranged around the movable connection member. One end of the monitoring deformation connecting rod 3 is movably arranged in the connection channel opened in the foundation pit support cylinder 1 and is used to be movably connected to the movable connection member, and the other end of the monitoring deformation connecting rod 3 movably passes through the side wall of the foundation pit support cylinder 1.

[0019] In an embodiment, the monitoring device is configured to be disposed between the steel supports of the foundation pit, and one is disposed every several steel supports. Through this monitoring device, not only can the support formwork or the ring beam of the foundation pit be supported, but also the deformation condition of the foundation pit can be conveniently monitored in real time. By supporting one of the support connection seats 2 at both ends of the foundation pit support casing 1 of the monitoring device with the formwork (steel plate) or the ring beam on one side of the foundation pit side wall, and supporting the other support connection seat 2 at both ends of the foundation pit support casing 1 of the monitoring device with the formwork (steel plate) or the ring beam on the other side of the foundation pit side wall, and then adjusting the horizontal and vertical positions of the monitoring device; passing the monitoring deformation connecting rod 3 to be lengthened through the hole opened on the side wall of the foundation pit support casing 1 and connecting it with the monitoring deformation connecting rod 3 provided in the foundation pit support casing 1, and cutting the end of the monitoring deformation connecting rod 3 remaining outside the wall of the foundation pit support casing 1 so that the monitoring deformation connecting rod 3 is coplanar and flush with the outer wall of the foundation pit support casing 1, so that the monitoring device at this time is in a state of stably supporting the soil body of the foundation pit side wall.

[0020] Embodiment 2 Based on Embodiment 1, as Figures 3 to 4 shown, the provided movable connecting member includes a movable connection head 22 and a movable connection ball rod 23; one end of the movable connection head 22 away from the connection channel opened on the foundation pit support casing 1 is used to connect with the movable connection guide sleeve rod 21, the other end of the movable connection head 22 is used to connect with the movable connection ball rod 23, and the movable connection head 22 is movably limitedly arranged on the side wall of the connection channel opened on the foundation pit support casing 1; one end of the movable connection ball rod 23 away from the movable connection head 22 is used to be movably connected with the bottom end of the connection channel opened on the foundation pit support casing 1; the monitoring deformation connecting rod 3 is respectively movably connected with the movable connection ball rod 23.

[0021] Furthermore, the provided movable connecting member further includes movable limit seats 24 respectively used for movably hinging the monitoring deformation connecting rods; the movable limit seats 24 are provided with movable chutes, the bottom end of the connection channel opened on the foundation pit support casing 1 where the movable connection head 22 is located is provided with limit sliding blocks corresponding to the movable limit seats 24, and the movable limit seats 24 are all movably arranged in the connection channel opened on the foundation pit support casing 1, and the limit sliding blocks are slidably adapted to the movable chutes.

[0022] And, the diameter of the provided movable connection head 22 is larger than the diameter of the movable connection ball rod 23, and the inner diameter of the connection channel opened on the foundation pit support casing 1 is larger than the diameter (i.e., the outer diameter) of the movable connection head 22; in this way, it can be ensured that the movable connection head 22 has a certain movable space in the connection channel opened on the foundation pit support casing 1.

[0023] In an embodiment, the movable connector 22 of this setting can move in the connection channel opened in the foundation pit support casing 1. Since the movable connecting rod 23 connected to one end of the movable connector 22 is smaller than the diameter of the movable connector 22, the movable connecting rod 23 can also move in the connection channel opened in the foundation pit support casing 1. At the same time, one end of the movable connecting rod 23, which is far from the movable connector 22, is "flexibly movably connected" to the bottom end of the connection channel opened in the foundation pit support casing 1, so that the movable connecting rod 23 maintains a certain degree of movement; each monitoring deformation connecting rod 3 provided for convenient monitoring is "movably" connected to the movable connecting rod 23; furthermore, when the soil body on the side wall of the foundation pit drives the formwork (steel formwork) or the ring beam on the side wall of the foundation pit to move and deform; at this time, the support connection seat 2 that is limitedly connected to the formwork (steel formwork) or the ring beam on the side wall of the foundation pit drives the support connection seat 2 to "move" under the condition of soil body deformation, and the support connection seat 2 drives the movable connection guide sleeve rod 21 to drive the movable connector 22 to "move" in the connection channel opened in the foundation pit support casing 1, thereby driving the monitoring deformation connecting rod 3 connected to the movable connecting rod 23 to move, and judging whether the foundation pit soil body has displacement and deformation according to the relative distance position between the monitoring deformation connecting rod 3 and the outer wall of the foundation pit support casing 1.

[0024] Furthermore, an activity articulated connecting rod 241 is provided at one end of the activity limiting seat 24 close to the movable connecting rod 23. One end of the activity articulated connecting rod 241 is used for articulated connection with the activity limiting seat 24 through an articulated seat, and the other end of the activity articulated connecting rod 241 is used for movable connection with the movable connecting rod 23 through an articulated seat; one end of the monitoring deformation connecting rod 3 close to the activity limiting seat 24 is detachably connected to the limiting seat by threads, and the monitoring deformation connecting rod 3 can also be lengthened by means of threaded connection.

[0025] It should be noted here that one of the movable connection methods between the activity articulated connecting rod 241 and the movable connecting rod 23 of this setting: the activity articulated connecting rod 241 can be movably articulated with the movable connecting rod 23 through an articulated seat. At this time, the position of the activity articulated connecting rod 241 relative to the movable connecting rod 23 is relatively fixed, and the activity limiting seat 24 cannot be adjusted relatively through the activity articulated connecting rod 241, that is, it is not convenient to adjust the monitoring deformation connecting rod 3. Furthermore, for the lengthening method of the monitoring deformation connecting rod 3, only after lengthening, the monitoring deformation connecting rod 3 can be cut according to requirements to realize the initial relative position distance of the monitoring deformation connecting rod 3; Another one is that one end of the movable articulated connecting rod 241 close to the movable connecting cue 23 is slidably and limit-connected to the movable connecting cue 23 through a sliding block; and, at one end of the sliding block close to the movable connecting head 22, threaded holes are respectively and correspondingly formed on the movable connecting head 22 and the support connecting seat 2, and a bolt is used to adjust the distance between the sliding block and the movable connecting cue 23, so as to be able to adjust the relative initial positions of the respective movable limit seats 24 at the bottom end of the connecting channel opened in the foundation pit support casing 1; that is, the position relative to each monitoring deformation connecting rod 3 can be adjusted; furthermore, in the embodiment, the relative position between the monitoring deformation connecting rod 3 and the outer side wall of the foundation pit support casing 1 can be adjusted as required, so as to reduce the purpose of subsequent lengthening, and achieve the purpose of saving materials and resources.

[0026] Embodiment 3 On the basis of the structure of Embodiment 2, as Figures 5 to 6 shown, a deformation spring 31 is movably sleeved on the monitoring deformation connecting rod 3. One end of the deformation spring 31 is connected to the movable limit seat 24, and the other end of the deformation spring 31 is used to be connected to the side wall of the connecting channel opened in the foundation pit support casing 1. An activity guiding hole is formed at the bottom end of the connecting channel opened in the foundation pit support casing 1. One end of the movable connecting cue 23 far from the movable connecting head is connected with a movable ball head 231. One end of the movable ball head 231 close to the activity guiding hole can pass through the activity guiding hole movably, and the movable ball head 231 is movably connected to the foundation pit support casing 1 through the movable ball head. At the same time, the diameter of the movable ball head 231 is larger than the diameter of the movable connecting cue 23; a conical reset spring 232 is sleeved on the movable connecting cue 23; one end of the reset spring 232 is used to be connected to the movable connecting cue 23, and the other end of the reset spring 232 is used to be connected to the bottom end of the connecting channel opened in the foundation pit support casing 1.

[0027] In an embodiment, the movable connecting rod 23 is "flexibly movably connected" to the bottom end of the connecting channel opened in the foundation pit support cylinder 1 by using a movable ball head 231 (similar to a ball joint structure); when the soil body on the side wall of the foundation pit deforms and displaces, it drives the movable connecting rod 23 to move in the connecting channel opened in the foundation pit support cylinder 1 in the same direction as the deformation and displacement direction of the soil body on the side wall of the foundation pit, and then drives the monitoring deformation connecting rod 3 movably connected to the movable connecting rod 23 to move, that is, the monitoring deformation connecting rod 3 in the direction of the deformation and displacement of the soil body on the side wall of the foundation pit moves relative to the outer side wall of the foundation pit support cylinder 1 (the distance between the monitoring deformation connecting rod 3 and the outer side wall of the foundation pit support cylinder 1 increases, that is, the monitoring deformation connecting rod 3 exposed on this side of the outer side wall of the foundation pit support cylinder 1 increases); the monitoring deformation connecting rod 3 in the direction opposite to the deformation and displacement direction of the soil body on the side wall of the foundation pit moves relative to the inner side wall of the foundation pit support cylinder 1 (the distance between the monitoring deformation connecting rod 3 and the outer side wall of the foundation pit support cylinder 1 decreases, that is, the monitoring deformation connecting rod 3 on this side enters the hole in the side wall of the foundation pit support cylinder 1 and is relatively shortened relative to the outer side wall of the foundation pit support cylinder 1); at this time, it can be determined that the soil body of the foundation pit has undergone a large deformation and displacement.

[0028] In addition, a conical reset spring 232 is sleeved on the movable connecting rod 23, and the movable connecting rod 23 is elastically connected to the bottom end of the connecting channel opened in the foundation pit support cylinder 1 through the conical reset spring 232; after initial adjustment through the reset spring 232, it can be in an elastically movable state and can return to the initial state when not in use, which is convenient for later reuse.

[0029] Embodiment 4 Furthermore, the diameter of the provided movable connection head 22 is smaller than the inner diameter of the connecting channel opened in the foundation pit support cylinder 1 (as mentioned in the above embodiment). In order to enable the movable connection head 22 to have a "slight" displacement so as to drive the monitoring deformation connecting rod 3 to move; a number of movable abutting blocks 221 are respectively connected around the movable connection head 22, and the movable connection head 22 is used for movably limiting the inner side wall of the connecting channel opened in the foundation pit support cylinder 1 through the movable abutting blocks 221. Movable limiting abutting grooves corresponding to the movable abutting blocks 221 are opened around the inner side wall of the connecting channel opened in the foundation pit support cylinder 1, and the movable abutting blocks 221 are respectively movably arranged in the limiting abutting grooves, and the movable abutting blocks 221 are movably limited through the limiting abutting grooves. The two side walls of the movable abutting blocks 221 are movably adapted to the two side walls of the limiting abutting grooves; there is a gap between the end face of one side of the movable abutting block 221 close to the limiting abutting groove and the side face close to the limiting abutting groove.

[0030] In the embodiment, since the diameter of the movable connector 22 is smaller than the inner diameter of the connection channel opened in the foundation pit support casing 1; the movable abutting blocks 221 connected around the movable connector 22 are slidably and limitedly arranged with the limit abutting grooves, and there is a certain gap between the movable abutting blocks 221 and the limit abutting grooves, so the movable connector 22 can be "moved" in the connection channel opened in the foundation pit support casing 1; it is convenient to drive the relative movement of each monitoring deformation connecting rod 3, and then it is convenient to observe the distance position between the monitoring deformation connecting rod 3 and the outer wall of the foundation pit support casing 1, and it is convenient for on-site personnel to observe and monitor the deformation and displacement of the foundation pit soil body.

[0031] From the purpose of the designed monitoring device, the monitoring device has a simple structure, is convenient to install and disassemble, and can be recycled multiple times; at the same time, through this monitoring device, it is convenient for non-technical personnel to monitor the deformation of the foundation pit in real time, saving manpower and costs.

Claims

1. A foundation pit support deformation monitoring device, characterized in that: It comprises a foundation pit support casing, wherein both ends of the foundation pit support casing are respectively provided with connection channels, a movable connection structure is installed and connected in the connection channel, and one end of the movable connection structure away from the foundation pit support casing is connected to a support connection seat for supporting on the side wall of the foundation pit; The movable connection structure includes a movable connection guide sleeve rod, one end of which is used to connect with the support connection seat, and the other end of which is movably connected to the bottom end of the connection channel provided by the foundation pit support casing through a movable connection piece; Monitoring deformation connecting rods for convenient monitoring are movably arranged around the movable connecting piece, one end of the monitoring deformation connecting rod can be movably arranged in a connecting channel opened in the foundation pit support casing and is used to be movably connected to the movable connecting piece, and the other end of the monitoring deformation connecting rod can be movably passed through the side wall of the foundation pit support casing.

2. A foundation pit support deformation monitoring device according to claim 1, characterized in that: The movable connecting piece includes a movable connecting head and a movable connecting ball rod; One end of the movable connection head away from the connection channel opened by the foundation pit support casing is used to connect with the movable connection guide sleeve rod, and the other end of the movable connection head is used to connect with the movable connection ball rod, and the movable connection head and the side wall of the connection channel opened by the foundation pit support casing are movable limit settings; The end of the movable connecting ball rod away from the movable connecting head is used to be movably connected to the bottom end of the connecting channel provided in the foundation pit supporting casing; The deformation monitoring connecting rods are movably connected to the movably connected ball rods respectively.

3. A foundation pit support deformation monitoring device according to claim 2, characterized in that: The movable connecting member also includes movable limit seats respectively used for monitoring the deformed connecting rods which can be movably hinged; The movable limit seat is provided with a movable slide groove, and a limit sliding block corresponding to the movable limit seat is arranged at the bottom end of the connecting channel opened by the movable connecting head and the foundation pit support casing. The movable limit seat can be movably arranged in the connecting channel opened by the foundation pit support casing, and the limit sliding block is slidably adapted to the movable slide groove.

4. A foundation pit support deformation monitoring device according to claim 3, characterized in that: The diameter of the movable joint is larger than the diameter of the movable joint ball rod; A movable hinged connecting rod is arranged at one end of the movable limit seat close to the movable connecting ball rod, one end of the movable hinged connecting rod is arranged to be hingedly connected to the movable limit seat through the hinge seat, and the other end of the movable hinged connecting rod is arranged to be movably connected to the movable connecting ball rod through the hinge seat; One end of the deformation monitoring connecting rod close to the movable limiting seat is detachably connected to the limiting seat by thread.

5. A foundation pit support deformation monitoring device according to claim 4, characterized in that: A deformation spring is provided on the movable sleeve of the deformation monitoring connecting rod, one end of the deformation spring is connected to the movable limit seat, and the other end of the deformation spring is used to connect to the side wall of the connecting channel opened in the foundation pit support casing.

6. A foundation pit support deformation monitoring device according to claim 5, characterized in that: A movable guide hole is provided at the bottom end of the connecting channel of the foundation pit support casing, and a movable ball head is connected to the end of the movable connecting ball rod away from the movable connecting head. The end of the movable ball head close to the movable guide hole can be movably passed through the movable guide hole, and the movable ball head is movably connected to the foundation pit support casing through the movable ball head.

7. A foundation pit support deformation monitoring device according to claim 6, characterized in that: The diameter of the movable ball head is larger than the diameter of the movable connecting ball rod; The movable connecting club is provided with a conical return spring; One end of the reset spring is used to be connected with the movable connecting ball rod, and the other end of the reset spring is used to be connected with the bottom end of the connecting channel opened in the foundation pit support casing.

8. The foundation pit support deformation monitoring device according to claim 7, characterized in that: The diameter of the movable joint is smaller than the inner diameter of the connecting passage provided in the foundation pit support casing; The movable connecting head is respectively connected with a plurality of movable abutment blocks around its periphery, and the movable connecting head is used for movable limiting setting with the inner side wall of the connecting channel opened with the foundation pit supporting casing through the movable abutment blocks.

9. The foundation pit support deformation monitoring device according to claim 8, characterized in that: The inner side walls of the connecting passage of the foundation pit support casing are provided with movable limiting abutment grooves corresponding to the movable abutment blocks. The movable abutment blocks are movably arranged in the limiting abutment grooves, and the movable abutment blocks are movably limited by the limiting abutment grooves.

10. A foundation pit support deformation monitoring device according to claim 9, characterized in that: The two side walls of the movable abutment block are movably adapted to the two side walls of the limiting abutment groove; There is a gap between an end surface of the movable abutting block close to the limiting abutting groove and a side surface close to the limiting abutting groove.

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