Supporting device for foundation pit excavation

Abstract

This invention discloses a support device for foundation pit excavation, comprising: a lower protective plate and an upper protective plate, each corresponding to the other, forming a cubic shape to prevent foundation pit landslides; symmetrical mounting components are provided on both the lower and upper protective plates, and the lower and upper protective plates are connected to each other via these mounting components; pin holes are provided at the top of each lower and upper protective plate, and pin rods are provided at the bottom of each lower and upper protective plate, with corresponding upper and lower protective plates connected via pin rods and pin holes; brackets are respectively installed on the lower and upper protective plates to reinforce them; and supports are symmetrically installed on the brackets. This invention enables rapid assembly and disassembly of foundation pit support plates, improves installation efficiency, facilitates detection of deformation and adjustment of support force, enhances performance, and improves the stability of foundation pit support.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and more particularly to a support device for foundation pit excavation. Background Technology

[0002] Foundation pit support refers to temporary measures for supporting, reinforcing, protecting, and controlling groundwater in order to protect the construction of the underground main structure and the safety of the surrounding environment of the foundation pit. It is divided into two categories according to the excavation depth: shallow foundation pit support and deep foundation pit support.

[0003] Currently, most shallow foundation pit support plates are bolted, welded, and sprayed together. They need to be disassembled after construction, but this method has the following drawbacks: the welded parts are not separated, which increases the workload of workers during disassembly; the support plates are subjected to soil pressure for a long time during the protection process, causing deformation and posing safety hazards; the deformation cannot be detected and the support force cannot be adjusted; and the large number of bolts affects the efficiency of disassembly, which not only increases the workload of workers but also affects the construction progress and increases construction costs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a support device for foundation pit excavation, enabling rapid assembly and disassembly of foundation pit support plates, improving installation efficiency, facilitating the detection of deformation of the support device and adjustment of support force, enhancing the effectiveness of use, and improving the stability of foundation pit support.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a support device for foundation pit excavation, comprising: The lower protective plate and the upper protective plate are in one-to-one correspondence, used to enclose a cubic shape to prevent the foundation pit from sliding. The lower and upper protective plates are provided with symmetrical mounting parts, and the lower protective plates are spliced ​​together with the upper protective plates through the mounting parts. The top of each lower and upper protective plate is provided with pin holes, and the bottom of each lower and upper protective plate is provided with pin rods. The corresponding upper and lower protective plates are spliced ​​together through pin rods and pin holes. The brackets are respectively installed on the lower protective plate and the upper protective plate to reinforce the lower protective plate and the upper protective plate; The supports are in two sets, symmetrically arranged on the bracket; The cross frame includes a fixed cross frame that is fixedly installed between the lower protective plate and the support, and between the upper protective plate and the support, and a movable cross frame that is installed on the inner side of the support to protect the joint of the lower protective plate and the joint of the upper protective plate. The outer side of the support is provided with an inclined frame, and the fixed cross frame is provided with a through groove. The inclined support frame includes an auxiliary frame fixedly mounted on a support, a first inclined support frame mounted on the auxiliary frame, and a second inclined support frame mounted on the auxiliary frame and the first inclined support frame; The inspection unit is set on the bracket and the inclined support frame respectively, and is used to inspect the deformation of the lower protective plate, the upper protective plate, and the inclined support frame.

[0006] Furthermore, the auxiliary frame includes a fixing plate disposed at the bottom of the lower protective plate and a fixing block disposed on the fixing crossbar; It also includes a support screw that runs through the space between the fixing plate and the fixing block.

[0007] Furthermore, the first diagonal brace includes a first fixed seat disposed on a fixed plate and a first rotating body rotatably disposed on the first fixed seat; It also includes a first outer cylinder disposed on the first rotating body, and a first stud disposed inside the first outer cylinder, wherein a second fixing seat rotatably mounted on the first stud and fixed on the fixing block is provided; It also includes a first tilt sensor mounted on the first rotating body, and a first displacement meter mounted on the first rotating body and the second fixed base, respectively.

[0008] Furthermore, the second diagonal brace includes a third fixed seat disposed on the top of the fixed block and the second fixed seat, and a second outer cylinder rotatably disposed on the third fixed seat; It also includes a second stud disposed inside the second outer cylinder, and a fourth fixed seat disposed on the fixed crossbeam and rotatably connected to the second stud.

[0009] Furthermore, both the first outer cylinder and the second outer cylinder are provided with rotating parts, and a third rotating body is rotatably provided between the third fixed base and the second outer cylinder, and a second tilt sensor is provided on the third rotating body. A second displacement meter is provided on the third rotating body and the fourth fixed base respectively.

[0010] Furthermore, the bracket includes first pillars symmetrically arranged on the lower protective plate and first mounting blocks respectively arranged on the first pillars, and the first mounting blocks are provided with grooves. It also includes second pillars symmetrically arranged on the upper protective plate and respectively inserted into the grooves, and second mounting blocks arranged on the second pillars.

[0011] Furthermore, the support is provided with a first platform for supporting the movable crossbeam and a second platform for supporting the diagonal frame, and the bottom of the support is triangular. The support is provided with a middle partition and a baffle for installing the diagonal frame.

[0012] Furthermore, the mounting component includes a sliding groove body symmetrically arranged on the lower protective plate and the upper protective plate, and a support block provided on both the lower protective plate and the upper protective plate for supporting the sliding groove body; It also includes a connecting slider disposed in the slide body. The connecting slider is I-shaped and is used to splice two adjacent lower protective plates and two adjacent upper protective plates. The slide body is provided with screws for pressing the connecting slider. It also includes the connecting slider of the chute at the corner.

[0013] Furthermore, the detection unit includes a mounting base disposed on the lower protective plate and facing the through groove, and a steel plate strain gauge disposed on the bracket; It also includes a static level instrument installed in the card slot and a control box installed on the bracket. The control box is electrically connected to the steel plate strain gauge, the static level instrument, the first tilt sensor, the first displacement meter, the second tilt sensor, and the second displacement meter, respectively.

[0014] The beneficial effects of this invention are reflected in: This invention involves excavating a shallow foundation pit, then arranging multiple lower protective plates tightly around the pit. First supports on the lower protective plates are inserted into the pit, and connecting sliders are inserted between them. Screws tighten the sliding groove and connecting sliders. Then, splicing sliders are used to splice the lower protective plates at the corners between two lower protective plates, again tightened by screws. The plates are supported by fixed crossbeams between the first supports, and the splicing points of the two lower protective plates are supported by movable crossbeams mounted on supports. Additionally, diagonal frames are installed between the supports at the corners of the two lower protective plates to reinforce the lower protective plates at the corners. The protective plate is then rotated between the fixed plate and the fixed block via a support screw, and inserted into the pit to enhance protection. A pin on the upper protective plate is then inserted into a pin hole at the bottom of the lower protective plate. The two upper protective plates are installed together via a sliding groove, connecting slider, and screws. The corners of the two protective plates are also installed via a sliding groove, splicing slider, and screws. The upper protective plates are supported by a fixed crossbeam between their second pillars. Movable crossbeams are installed on the supports of the upper protective plates to splice the joints between them. The corners of the two upper protective plates are supported by diagonal brackets installed on the supports. Then, strain gauges are installed on the lower protective plate and the first support column, and a mounting bracket and static level are installed on the lower protective plate to detect the stress on the upper and lower protective plates. The static level is also used to detect the vertical settlement around the upper and lower protective plates. The data is transmitted to the control box, processed, and then transmitted to the warning device on the control box. Then, by rotating the first outer cylinder, the first stud extends out of the first outer cylinder to further tighten the lower protective plate, increasing the diagonal support force. The support force is detected by the first tilt sensor and the first displacement gauge on the first diagonal brace. A third fixed seat is installed on the second fixed seat, and a fourth fixed seat is installed on the fixed crossbeam on the upper protective plate. A second outer cylinder and a second stud are rotatably installed between the third and fourth fixed seats. By rotating the second outer cylinder, the second stud provides one-step support to the upper protective plate. The displacement of the second outer cylinder and the second stud is detected by the second tilt sensor and the second displacement meter. Similarly, each upper and lower protective plate can be disassembled, realizing the rapid splicing and disassembly of the foundation pit support plate, improving installation efficiency, facilitating the detection of deformation of the support device and adjustment of support force, improving the use effect, and improving the stability of the foundation pit support. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural view of the present invention; Figure 2 This is a perspective view of the lower protective plate and the detection section of the present invention; Figure 3 This is a three-dimensional structural view of the inclined support frame of the present invention; Figure 4 This is a three-dimensional structural view of the mounting component of the present invention; Figure 5 This is a three-dimensional structural view of the bracket and inclined frame of the present invention; Figure 6 This is a three-dimensional structural view of the bracket and inclined frame of the present invention from another perspective. Figure 7 This is a three-dimensional structural view of the support of the present invention.

[0016] In the picture: 1. Lower protective plate; 2. Bracket; 21. First support column; 22. First mounting block; 23. Second support column; 3. Install protective panels; 4. Support; 5. Horizontal frame; 51. Fixed horizontal frame; 52. Movable horizontal frame; 6. Mounting components; 61. Slide body; 62. Connecting slider; 63. Screws; 64. Splicing slider; 7. Inclined support frame; 71. Auxiliary frame; 711. Fixing plate; 712. Support screw; 713. Fixing block; 72. First inclined support frame; 721. First fixed seat; 722. First rotating body; 723. First tilt sensor; 724. First displacement gauge; 725. First outer cylinder; 726. First stud; 727. Second fixed seat; 73. Second inclined support frame; 731. Third fixed seat; 732. Second outer cylinder; 733. Second stud; 734. Fourth fixed seat; 8. Testing Department; 81. Steel Plate Strain Gauge; 9. Inclined frame. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-7 This invention discloses a support device for foundation pit excavation, comprising: The lower protective plate 1 and the upper protective plate 3 are in one-to-one correspondence and are used to enclose a cubic shape to prevent the foundation pit from sliding. There are multiple lower protective plates 1 and upper protective plates 3, which are spliced ​​together to protect the foundation pit and prevent it from sliding. The two lower protective plates 1 are spliced ​​together by the mounting piece 6, and the two upper protective plates 3 are spliced ​​together by the mounting piece 6. The lower protective plates 1 and the upper protective plates 3 are connected by pins and pin holes. Both the lower protective plate 1 and the upper protective plate 3 are provided with symmetrical mounting parts 6, and each lower protective plate 1 and each upper protective plate 3 are spliced ​​together by the mounting parts 6. Each lower protective plate 1 and each upper protective plate 3 has a pin hole at the top and a pin rod at the bottom. The corresponding upper protective plate 3 and lower protective plate 1 are spliced ​​together by the pin rod and the pin hole. The bracket 2 is respectively set on the lower protective plate 1 and the upper protective plate 3 to reinforce the lower protective plate 1 and the upper protective plate 3. The bracket 2 is installed on the lower protective plate 1 and the upper protective plate 3 by welding to improve the stability of the upper protective plate 3 and the lower protective plate 1. Supports 4, in two sets, are symmetrically arranged on the bracket 2. Supports 4 and bracket 2 are fixedly installed by welding. Supports 4 are used to splice movable crossbars 52 between the two upper protective plates 3 and between the two lower protective plates 1. Supports 4 are also used to splice diagonal frames 9 at the corners. This improves the stability of the splicing points of the two lower protective plates 1, the splicing points of the two upper protective plates 3 and the corner splicing points. The crossbeam 5 includes a fixed crossbeam 51 fixedly installed between the lower protective plate 1 and the support 2, and between the upper protective plate 3 and the support 2, and a movable crossbeam 52 installed on the inner side of the support 4 to protect the joint of the lower protective plate 1 and the joint of the upper protective plate 3. The support 4 has a diagonal frame 9 on its outer side. The fixed crossbeam 51 has a through groove. The upper protective plate 3 and the lower protective plate 1 are fixedly welded with the crossbeam 51 to improve their support stability. The movable crossbeam 52 is inserted into the support 4 at the joint of the two lower protective plates 1, the support 4 at the joint of the two upper protective plates 3, and the diagonal frame 9 is inserted into the support 4 at the corner to improve the stability of the foundation pit support formed by the joint of the lower protective plate 1 and the upper protective plate 3. The inclined support frame 7 includes an auxiliary frame 71 fixedly mounted on the bracket 2, a first inclined support frame 72 mounted on the auxiliary frame 71, and a second inclined support frame 73 mounted on the auxiliary frame 71 and the first inclined support frame 72. The inclined support frame 7 is used to obliquely support the lower protective plate 1 and the upper protective plate 3. The detection unit 8 is respectively installed on the bracket 2 and the inclined support frame 7. It is used to detect the deformation of the lower protective plate 1, the upper protective plate 3, and the inclined support frame 7. The detection unit 8 is used to detect the deformation and settlement of the lower protective plate 1 and the upper protective plate 3. By adjusting the inclined support frame 7, the deformation of the upper protective plate 3 and the lower protective plate 1 is compensated to improve their stability.

[0019] In a specific embodiment, the auxiliary frame 71 includes a fixing plate 711 disposed at the bottom of the lower protective plate 1 and a fixing block 713 disposed on the fixing cross frame 51. The fixing plate 711 is fixedly installed to the lower protective plate 1 by welding, and the fixing block 713 is fixedly installed to the fixing cross frame 51 by welding. It also includes a support screw 712 that passes through the fixing plate 711 and the fixing block 713. The support screw 712 is threadedly connected to the fixing plate 711 and the fixing block 713 respectively. The support screw 712 is used to insert into the pit to improve the stability of the lower protective plate 1.

[0020] In one embodiment, the first diagonal brace 72 includes a first fixed seat 721 disposed on a fixed plate 711 and a first rotating body 722 rotatably disposed on the first fixed seat 721. The fixed plate 711 and the first fixed seat 721 are fixedly installed by welding, and the first fixed seat 721 and the first rotating body 722 are rotatably connected. It also includes a first outer cylinder 725 disposed on the first rotating body 722, and a first stud 726 disposed inside the first outer cylinder 725. A second fixing seat 727 rotatably mounted on the first stud 726 and fixed on the fixing block 713 is provided on the first stud 726. The first rotating body 722 is rotatably connected to the first outer cylinder 725. A rotating rod is provided on the first outer cylinder 725 for manually rotating the first outer cylinder 725. A second rotating body is installed between the first stud 726 and the second fixing seat 727. The second rotating body is rotatably connected to the second fixing seat 727. The second rotating body and the first stud 726 are fixedly installed by welding or bolts and flanges. It also includes a first tilt sensor 723 disposed on the first rotating body 722, and a first displacement meter 724 disposed on the first rotating body 722 and the second fixed base 727 respectively. The first tilt sensor 723 is used to detect the tilt angle between the first outer cylinder 725 and the first stud 726, and the first displacement meter 724 is used to detect the displacement between the first outer cylinder 725 and the first stud 726.

[0021] In a specific embodiment, the second diagonal brace 73 includes a third fixed seat 731 disposed on the top of the fixed block 713 and the second fixed seat 727, and a second outer cylinder 732 rotatably disposed on the third fixed seat 731. The fixed block 713 and the second fixed seat 727 are respectively fixedly installed to the third fixed seat 731 by bolts. A third rotating body is installed between the third fixed seat 731 and the second outer cylinder 732. The third rotating body is rotatably connected to the third fixed seat 731 and the second outer cylinder 732. It also includes a second stud 733 disposed inside the second outer cylinder 732, and a fourth fixed seat 734 disposed on the fixed crossbeam 51 and rotatably connected to the second stud 733. The second outer cylinder 732 and the second stud 733 are connected by threads. A fourth rotating body is installed between the second stud 733 and the fourth fixed seat 734. The second stud 733 and the fourth rotating body are fixedly installed by welding or bolts and flanges. The fourth rotating body is rotatably connected to the fourth fixed seat 734. A rotating rod is installed on the outer wall of the second outer cylinder 732. By rotating the second outer cylinder 732, the distance between the second outer cylinder 732 and the second stud 733 can be adjusted to further tighten the upper protective plate 3.

[0022] In one embodiment, both the first outer cylinder 725 and the second outer cylinder 732 are provided with rotating parts. A third rotating body is rotatably provided between the third fixed seat 731 and the second outer cylinder 732, and a second tilt sensor is provided on the third rotating body. A second displacement meter is provided on the third rotating body and the fourth fixed seat 734 respectively. The second tilt sensor is used to detect the tilt angle of the second outer cylinder 732, and the second displacement meter is used to detect the distance between the second outer cylinder 732 and the second stud 733, so as to determine the compensating support force.

[0023] In a specific embodiment, the bracket 2 includes a first support column 21 symmetrically arranged on the lower protective plate 1 and a first mounting block 22 respectively arranged on the first support column 21. The first mounting block 22 has a groove. The first support column 21 and the first mounting block 22 are both fixedly installed on the lower protective plate 1 by welding. It also includes a second support column 23 symmetrically arranged on the upper protective plate 3 and inserted into the groove respectively, and a second mounting block arranged on the second support column 23. The second support column 23 and the second mounting block are fixedly installed to the upper protective plate 3 by welding. The second support column 23 is inserted into the first mounting block 22 to improve the insertion stability of the upper protective plate 3 and the lower protective plate 1.

[0024] In one embodiment, the support 4 is provided with a first platform for supporting the movable crossbeam 52 and a second platform for supporting the diagonal frame 9. The bottom of the support 4 is triangular, and the support 4 is provided with a middle partition plate and a baffle for installing the diagonal frame 9. The support 4 is used to support the movable crossbeam 52 and the diagonal frame 9.

[0025] In a specific embodiment, the mounting component 6 includes a sliding groove 61 symmetrically arranged on the lower protective plate 1 and the upper protective plate 3, and a support block provided on both the lower protective plate 1 and the upper protective plate 3 for supporting the sliding groove 61. The sliding groove 61 is welded to the upper protective plate 3 and the lower protective plate 1 respectively, and the cross-section of the sliding groove 61 is C-shaped. It also includes a connecting slider 62 disposed in the slide body 61. The connecting slider 62 is I-shaped and is used to splice two adjacent lower protective plates 1 and two adjacent upper protective plates 3. The slide body 61 is provided with a screw 63 for pressing the connecting slider 62. The connecting slider 62 is used to splice the lower protective plates 1 and the upper protective plates 3. The slide body 61 and the connecting slider 62 are pressed together by the screw 63. It also includes a splicing slider 64 that connects to the slide body 61 at the corner. The splicing slider 64 is inserted into the slide body 61, and the splicing slider 64 and the slide body 61 are pressed together by the screw 63.

[0026] In one embodiment, the detection unit 8 includes a card holder disposed on the lower protective plate 1 and facing the through groove, and a steel plate strain gauge 81 disposed on the bracket 2. The steel plate strain gauge 81 is used to detect the deformation of the upper protective plate 3 and the lower protective plate 1. It also includes a static level instrument installed in the card slot and a control box installed on the bracket 2. The control box is electrically connected to the steel plate strain gauge 81, the static level instrument, the first tilt sensor 723, the first displacement meter 724, the second tilt sensor, and the second displacement meter, respectively.

[0027] In use, after excavating a shallow foundation pit, multiple lower protective plates 1 are arranged closely around the pit. First support columns 21 on the lower protective plates 1 are inserted into the pit, and then connecting sliders 62 are inserted between the lower protective plates 1. Screws 63 press the sliding groove body 61 and connecting slider 62 together. Then, splicing sliders 64 are used to splice the lower protective plates 1 at the corners between two lower protective plates 1, with screws 63 pressing the sliding groove body 61 and splicing slider 64 together. The plates are then supported by fixed crossbeams 51 between the first support columns 21. Movable crossbeams 52 are installed on supports 4 at the splicing points of the two lower protective plates 1. Diagonal frames 9 are installed between the supports 4 at the corners of the two lower protective plates 1 to reinforce the lower protective plates at the corners. The protective plate 1 is then rotated between the fixed plate 711 and the fixed block 713 via the support screw 712, and inserted into the pit to enhance protection. It is then connected to the lower protective plate 1 via a pin on the upper protective plate 3, and the two upper protective plates 3 are installed together via a sliding groove 61, a connecting slider 62, and a screw 63. The corners of the two lower protective plates 1 are installed via a sliding groove 61, a splicing slider 64, and a screw 63. The upper protective plates 3 are supported by a fixed crossbeam 51 between the second pillars 23 of the upper protective plates 3. A movable crossbeam 52 is installed on the support 4 on the upper protective plate 3 to splice the joint of the two upper protective plates 3. The corners of the two upper protective plates 3 are supported by a diagonal bracket 9 installed on the support 4. The system provides support, and then uses steel plate strain gauges 81 installed on the lower protective plate 1 and the first support column 21, as well as a mounting bracket and static level on the lower protective plate 1, to detect the stress on the upper protective plate 3 and the lower protective plate 1. The static level also detects the vertical settlement around the upper protective plate 3 and the lower protective plate 1, transmitting the data to the control box for processing and then to the warning device on the control box. Then, by rotating the first outer cylinder 725, the first stud 726 extends out of the first outer cylinder 725, further tightening the lower protective plate 1 and increasing the oblique support force. The support force is detected by the first tilt sensor 723 and the first displacement gauge 724 on the first oblique support frame 72, and then by the second fixing... A third fixed seat 731 is installed on the seat 727, and a fourth fixed seat 734 is installed on the fixed crossbeam 51 on the upper protective plate 3. A second outer cylinder 732 and a second stud 733 are rotatably installed between the third fixed seat 731 and the fourth fixed seat 734, respectively. By rotating the second outer cylinder 732, the second stud 733 provides one-step support for the upper protective plate 3. The displacement of the second outer cylinder 732 and the second stud 733 is detected by the second tilt sensor and the second displacement meter. Similarly, each upper protective plate 3 and lower protective plate 1 can be disassembled, realizing the rapid splicing and disassembly of the foundation pit support plate, improving installation efficiency, facilitating the detection of deformation of the support device and adjustment of support force, improving the use effect, and improving the stability of the foundation pit support.

[0028] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] Additionally, "multiple" refers to two or more.

[0031] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A support device for foundation pit excavation, characterized in that, include: The lower protective plate (1) and the upper protective plate (3) are in one-to-one correspondence and are used to enclose the cubic shape to prevent the foundation pit from sliding. The lower protective plate (1) and the upper protective plate (3) are provided with symmetrical mounting parts (6), and the lower protective plates (1) and the upper protective plates (3) are spliced ​​together by the mounting parts (6). The top of each lower protective plate (1) and each upper protective plate (3) is provided with pin holes, and the bottom of each lower protective plate (1) and each upper protective plate (3) is provided with pin rods. The upper protective plates (3) and the lower protective plates (1) corresponding to each other are spliced ​​together by pin rods and pin holes. The bracket (2) is respectively installed on the lower protective plate (1) and the upper protective plate (3) to reinforce the lower protective plate (1) and the upper protective plate (3). Supports (4) are in two sets, symmetrically arranged on the bracket (2); The cross frame (5) includes a fixed cross frame (51) fixedly installed between the lower protective plate (1) and the support (2) and between the upper protective plate (3) and the support (2), and a movable cross frame (52) installed on the inner side of the support (4) to protect the joint between the lower protective plate (1) and the upper protective plate (3). The support (4) is provided with a slant frame (9), and the fixed cross frame (51) is provided with a through groove. The inclined support frame (7) includes an auxiliary frame (71) fixedly mounted on the support (2), a first inclined support frame (72) mounted on the auxiliary frame (71), and a second inclined support frame (73) mounted on the auxiliary frame (71) and the first inclined support frame (72). The detection unit (8) is respectively installed on the bracket (2) and the inclined support frame (7) to detect the deformation of the lower protective plate (1), the upper protective plate (3), and the inclined support frame (7).

2. The support device for foundation pit excavation according to claim 1, characterized in that: The auxiliary frame (71) includes a fixing plate (711) disposed at the bottom of the lower protective plate (1) and a fixing block (713) disposed on the fixing crossbar (51). It also includes a support screw (712) that runs through the space between the fixing plate (711) and the fixing block (713).

3. The support device for foundation pit excavation according to claim 2, characterized in that: The first diagonal brace (72) includes a first fixed seat (721) disposed on a fixed plate (711) and a first rotating body (722) rotatably disposed on the first fixed seat (721). It also includes a first outer cylinder (725) disposed on the first rotating body (722) and a first stud (726) disposed inside the first outer cylinder (725), wherein a second fixing seat (727) is rotatably mounted on the first stud (726) and fixed block (713); It also includes a first tilt sensor (723) disposed on the first rotating body (722) and a first displacement meter (724) disposed on the first rotating body (722) and the second fixed base (727).

4. The support device for foundation pit excavation according to claim 3, characterized in that: The second diagonal brace (73) includes a third fixed seat (731) disposed on the top of the fixed block (713) and the second fixed seat (727), and a second outer cylinder (732) rotatably disposed on the third fixed seat (731); It also includes a second stud (733) disposed in the second outer cylinder (732) and a fourth fixed seat (734) disposed on the fixed crossbeam (51) and rotatably connected to the second stud (733).

5. The support device for foundation pit excavation according to claim 4, characterized in that: Both the first outer cylinder (725) and the second outer cylinder (732) are provided with rotating parts. A third rotating body is rotatably provided between the third fixed seat (731) and the second outer cylinder (732), and a second tilt sensor is provided on the third rotating body. A second displacement meter is provided on the third rotating body and the fourth fixed seat (734).

6. The support device for foundation pit excavation according to claim 1, characterized in that: The bracket (2) includes a first support column (21) symmetrically arranged on the lower protective plate (1) and a first mounting block (22) respectively arranged on the first support column (21), and the first mounting block (22) has a groove. It also includes a second support column (23) symmetrically arranged on the upper protective plate (3) and inserted into the groove respectively, and a second mounting block arranged on the second support column (23).

7. The support device for foundation pit excavation according to claim 1, characterized in that: The support (4) is provided with a first platform for supporting the movable cross frame (52) and a second platform for supporting the inclined frame (9). The bottom of the support (4) is triangular. The support (4) is provided with a middle partition and a baffle for installing the inclined frame (9).

8. The support device for foundation pit excavation according to claim 1, characterized in that: The mounting component (6) includes a sliding groove (61) symmetrically arranged on the lower protective plate (1) and the upper protective plate (3), and a support block provided on both the lower protective plate (1) and the upper protective plate (3) for supporting the sliding groove (61); It also includes a connecting slider (62) disposed in the slide body (61). The connecting slider (62) is I-shaped and is used to splice two adjacent lower protective plates (1) and two adjacent upper protective plates (3). The slide body (61) is provided with screws (63) for pressing the connecting slider (62). It also includes a connecting slider (64) for the connecting groove body (61) at the corner.

9. The support device for foundation pit excavation according to claim 1, characterized in that: The detection unit (8) includes a card seat disposed on the lower protective plate (1) and facing the through groove, and a steel plate strain gauge (81) disposed on the bracket (2). It also includes a static level instrument installed in the card slot and a control box installed on the bracket (2). The control box is electrically connected to the steel plate strain gauge (81), the static level instrument, the first tilt sensor (723), the first displacement meter (724), the second tilt sensor, and the second displacement meter, respectively.

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