Excavation protection equipment for rock foundation pits

Abstract

The present invention discloses an excavation protection device for a rock foundation pit, specifically relating to the technical field of foundation pit protection, including an equipment main body, a support part, an adjustment part and an installation part, the equipment main body includes a horizontal frame and two vertical frames, the support part includes two protection vertical plates, the lower ends of the protection vertical plates are hinged with protection inclined plates, the protection vertical plates are vertically slidably connected with connecting plates, the upper ends of the connecting plates are hinged with the protection inclined plates through connecting rods; the adjustment part is used to drive the movement of the connecting plates, and the installation part is used to fix the equipment main body on the bottom of the rock foundation pit; when the lower end of the protection inclined plate in the present invention contacts the side wall of the foundation pit, the adjustment part can automatically switch and drive the protection inclined plate to swing, so that the protection inclined plate plays a good supporting and protective role on the side wall of the foundation pit, and the protection inclined plate and the supporting force on the side wall of the foundation pit are evenly distributed to prevent the soil layer from falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit protection, and more particularly to excavation protection equipment for a rock foundation pit. Background Art

[0002] A foundation pit is an earthen pit excavated at the foundation's designed location, according to the base elevation and plan dimensions. A rock foundation pit is a term used in geotechnical engineering, referring to a pit containing rock or quasi-rock within the soil layer at the foundation's designed location. Geotechnical excavation is a critical step in building construction. The excavated foundation pit provides space for the building's foundation and other structures, allowing masonry work to proceed according to the designated design location. To increase the safety factor during foundation pit operations and ensure the safety of underground structure construction and the surrounding environment, support, reinforcement, and protection measures are required for the pit's sidewalls and surroundings.

[0003] For example, a foundation pit support and protection structure with publication number CN115492123A includes a foundation pit body and a support box, wherein the upper side wall of the support box is rotatably connected to a support plate, and an adjustment mechanism is provided between the support plate and the inner bottom wall of the support box. The inner bottom wall of the support box and the lower side wall of the support plate are fixedly connected to a hollow disk, and each of the hollow disks is provided with a reinforcement mechanism. The lower side wall of the support plate is fixedly connected to a limit block, and the limit block is provided with a limit mechanism. The above invention can adjust its own angle according to the angle of the foundation pit body by adjusting and fixing the angle of the support plate, and has a wide range of applications. At the same time, it uses multiple screws to fix the inner wall and bottom of the foundation pit respectively, which improves the stability of the bottom of the device during support. Although the support structure can adjust its own angle according to the angle of the foundation pit body, it is necessary to first adjust the inclination angle of the support plate and then fix the device to the bottom of the foundation pit. If the fitting effect is not good, it is necessary to adjust the inclination angle of the support plate multiple times, which is time-consuming and labor-intensive.

[0004] Moreover, after the adjustment is completed, it is difficult to ensure the fit between the support plate and the side wall of the foundation pit, which leads to uneven distribution of the support force of the support plate on the side wall of the foundation pit, easily causing the relatively soft soil layer on the side wall of the foundation pit to fall off, resulting in poor protection effect.

[0005] To this end, the present invention proposes an excavation protection device for a rock foundation pit to solve the above problems. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an excavation protection device for a rock foundation pit, which solves the problems raised in the above-mentioned background technology by providing a support part and an adjustment part.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an excavation protection device for a rock foundation pit, comprising: an equipment main body, the equipment main body comprising a horizontal frame and two vertical frames, the two vertical frames being symmetrically arranged at the left and right ends of the horizontal frame; a support portion, the support portion comprising two protective vertical plates parallel to the vertical frames and connected in a transverse sliding manner, the two vertical frames being located between the two protective vertical plates, a protective inclined plate being hingedly connected to the lower end of the protective vertical plate away from the side of the vertical frame, and a vertical sliding connection being provided on the side of the protective vertical plate close to the vertical frame. A connecting plate is connected, and two symmetrically distributed connecting rods are hinged on the upper end of the connecting plate, and the free ends of the connecting rods pass through the protective vertical plate and are hinged to the protective inclined plate; an adjusting part, which is arranged between the horizontal frame and the vertical frame, and is used to drive the connecting plate to move. When the adjusting part drives the connecting plate to move in the horizontal direction until the lower part of the protective vertical plate contacts the side wall of the rock foundation pit, the connecting plate changes from the horizontal direction to the vertical direction to change the inclination angle of the protective inclined plate; a mounting part, which is used to fix the equipment body to the bottom of the rock foundation pit.

[0008] Preferably, the adjustment part includes a shell arranged between the horizontal frame and the vertical frame, a support plate is provided on the left inner part of the shell, two symmetrically distributed cross bars are provided between the support plate and the right side wall of the shell, push blocks are slidably connected to the two cross bars, front and rear ends of the push blocks are provided with front and rear axial plug posts, front and rear ends of the connecting plate are provided with sliding grooves, the plug posts are located in the sliding grooves, and the plug posts are located in the vertical part of the sliding grooves.

[0009] Preferably, a screw located between the two cross bars is rotatably connected between the shell and the support plate, the screw is threadedly connected to the push block, and a handwheel located outside the shell is provided at one end of the screw away from the support plate.

[0010] Preferably, the mounting portion includes a plurality of fixed blocks arranged on a horizontal frame, the plurality of fixed blocks being distributed in a rectangular array, the fixed blocks being threadedly connected with anchor bolts inclined toward the middle of the horizontal frame, and the anchor bolts being used to fix the fixed blocks to the bottom of the rock foundation pit.

[0011] Preferably, a detection portion is provided at the lower end of the protective vertical plate, and the detection portion includes a top block connected to the protective vertical plate in a transverse sliding manner. A first clearance groove corresponding to the top block is opened at the lower end of the protective inclined plate, and the top block extends from the first clearance groove. A first wedge block located in the outer shell is provided on the top block, and a second wedge block located directly above the first wedge block is provided at the lower end of the connecting plate. The end faces of the second wedge block and the adjacent ends of the first wedge block are both inclined surfaces and contact each other. When the top block contacts the side wall of the rock foundation pit and shrinks into the first clearance groove, the top block and the first wedge block drive the second wedge block to move upward.

[0012] Preferably, an anti-drop mechanism is provided on the upper end of the protective vertical plate, and two anti-drop mechanisms are staggered in the upper and lower parts. The anti-drop mechanism includes a protective frame hinged to the protective vertical plate, and a protective net is provided in the protective frame.

[0013] Preferably, a flat plate in the front-to-back direction is provided at the lower end of the protection frame, and two symmetrically distributed pressure rods are hinged at the lower end of the flat plate, and the free ends of the pressure rods are hinged to the upper end of the vertical frame.

[0014] Preferably, two symmetrically distributed horizontal cylinders are provided at the front and rear ends of the vertical frame, and a plurality of horizontal columns corresponding to the horizontal cylinders are provided on the protective vertical plate. The horizontal cylinders are sleeved on the horizontal columns on the corresponding sides, and a baffle is provided at the free end of the horizontal column, which is used to prevent the horizontal column from separating from the horizontal cylinder.

[0015] Preferably, two symmetrically distributed movable grooves are provided on the protective vertical plate, and upper and lower axial guide columns are provided in the movable grooves. The connecting plate is slidably connected to the two guide columns, and the guide columns are provided with a reset spring located between the connecting plate and the upper end of the movable groove. The reset spring always drives the connecting plate close to the lower end of the movable groove. A second yield groove is provided on the protective vertical plate, and the connecting rod passes through the center of the second yield groove.

[0016] Preferably, reinforcing ribs are provided at both the front and rear ends between the horizontal frame and the vertical frame, and the reinforcing ribs are used to enhance the connection strength between the horizontal frame and the vertical frame.

[0017] The technical effects and advantages of the present invention are as follows:

[0018] 1. The present invention can detect the contact state of the lower end of the protective inclined plate and the side wall of the foundation pit through the arrangement of the detection part and the support part, so that when the protective inclined plate contacts the side wall of the foundation pit, the adjustment part can stop driving the protective vertical plate and the protective inclined plate to move horizontally, and instead drive the upper part of the protective inclined plate to swing, so that the protective inclined plate fits the side wall of the foundation pit, and the supporting force of the protective inclined plate on the side wall of the foundation pit is evenly distributed. The support part can play a good supporting and protective role on the side wall of the foundation pit, prevent the relatively soft soil layer on the side wall of the foundation pit from falling off, and maintain a good supporting effect on the side wall of the foundation pit. It can be applicable to the side walls of the foundation pit with different degrees of inclination, can automatically adjust to quickly complete the support of the side wall of the foundation pit, and has higher safety performance.

[0019] 2. Through the setting of the adjustment part, the present invention can drive the protective inclined plate to move first toward the direction close to the side wall of the foundation pit, and then swing toward the side wall of the foundation pit, so as to fit on the side walls of the foundation pit at different angles. It can support and protect the side walls of the foundation pit at different angles, which brings convenience to the staff and increases the scope of application of the device.

[0020] 3. The present invention has an anti-fall mechanism. During the excavation process, when the soil and stones near the foundation pit are loosened and fall due to vibration, the protective net can prevent the soil and stones from hitting the workers. The protective net is inclined, and the soil and stones will roll along the inclined protective net, and finally stick to the protective inclined plate and fall from between the protective vertical plate and the protective inclined plate, so as to avoid affecting the operations in the foundation pit. In addition, the inclined protective net can prevent the soil and stones from accumulating above the protective net, and prevent the gravity of the soil and stones from affecting the normal use of the support part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the device body of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the support part and the anti-drop mechanism of the present invention.

[0024] Figure 4 This is a schematic structural diagram of the protective vertical plate of the present invention.

[0025] Figure 5 It is a partial front view cutaway view of the overall structure of the present invention.

[0026] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of part A.

[0027] Figure 7 It is a partial top view cutaway view of the overall structure of the present invention.

[0028] Figure 8 It is a structural schematic diagram of the adjustment part of the present invention.

[0029] Figure 9 It is a schematic diagram of the overall structure of the present invention when in use.

[0030] The accompanying drawings are marked as follows: 1. Equipment body; 101. Horizontal frame; 102. Vertical frame; 2. Support part; 201. Protective vertical plate; 202. Protective inclined plate; 203. Connecting plate; 204. Connecting rod; 3. Adjusting part; 301. Housing; 302. Support plate; 303. Crossbar; 304. Push block; 305. Insert column; 306. Slide groove; 307. Screw; 4. Mounting part; 401. Fixing block; 402. Foot Bolt; 5. Detection part; 501. Top block; 502. First clearance groove; 503. First wedge block; 504. Second wedge block; 6. Anti-drop mechanism; 601. Protection frame; 602. Protection net; 603. Flat plate; 604. Pressure rod; 7. Handwheel; 8. Horizontal cylinder; 9. Horizontal column; 10. Baffle; 11. Movable groove; 12. Guide column; 13. Return spring; 14. Second clearance groove; 15. Reinforcement rib. DETAILED DESCRIPTION

[0031] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Example 1

[0033] When the supporting device in the prior art supports and protects the side walls of the foundation pit, although it can adjust its own angle according to the angle of the foundation pit body, it is necessary to first adjust the inclination angle of the supporting plate and then fix the device to the bottom of the foundation pit. During this process, it is difficult to ensure the fit between the supporting plate and the side walls of the foundation pit, which leads to uneven distribution of the supporting force of the supporting plate on the side walls of the foundation pit, which easily causes the relatively soft soil layer on the side walls of the foundation pit to fall off, affecting the shaping of the side walls of the foundation pit. This embodiment is specially invented to solve the above problems.

[0034] See also Figure 1 As shown, the excavation protection equipment for rock foundation pits according to an embodiment of the present invention includes an equipment body 1. The equipment body 1 includes a horizontal frame 101 and two vertical frames 102. The two vertical frames 102 are symmetrically arranged at the left and right ends of the horizontal frame 101, and also includes a support part 2, an adjustment part 3 and an installation part 4.

[0035] See also Figures 1 to 9As shown, the support part 2 includes two protective vertical plates 201 that are parallel to the vertical frame 102 and are connected to the protective inclined plate 202 in a transverse sliding manner. The two vertical frames 102 are located between the two protective vertical plates 201. The lower end of the protective vertical plate 201 is hinged to a protective inclined plate 202 on the side away from the vertical frame 102. The side of the protective vertical plate 201 close to the vertical frame 102 is vertically slidably connected to a connecting plate 203. The upper end of the connecting plate 203 is hinged to two symmetrically distributed connecting rods 204. The free ends of the connecting rods 204 pass through the protective vertical plates 201 and are hinged to the protective inclined plates 202; the adjusting part 3 is arranged between the horizontal frame 101 and the vertical frame 102, and the adjusting part 3 is used to drive the connecting plate 203 to move. When the adjusting part 3 is working, the adjusting part 3 drives the connecting plate 203 to move in the horizontal direction first until the lower part of the protective vertical plate 201 contacts the side wall of the rock foundation pit, and the connecting plate 203 starts to move in the vertical direction. The mounting part 4 is used to fix the equipment body 1 at the bottom of the rock foundation pit.

[0036] See also Figure 5 、 Figure 7 and Figure 8 As shown, the adjustment part 3 includes a shell 301 arranged between the horizontal frame 101 and the vertical frame 102, a support plate 302 is provided on the left part of the shell 301, and two symmetrically distributed cross bars 303 are provided between the support plate 302 and the right side wall of the shell 301, and push blocks 304 are slidably connected to the two cross bars 303, and the front and rear ends of the push blocks 304 are provided with front and rear axial plug posts 305, the connecting plate 203 is C-shaped as a whole and a slide groove 306 is provided at its front and rear ends, the right part of the slide groove 306 is vertical and the left part is inclined with the left higher and the right lower, the plug post 305 is located in the slide groove 306, and in the initial state, the plug post 305 is located in the vertical part of the slide groove 306.

[0037] See also Figure 5 As shown, a screw rod 307 located between the two cross bars 303 is rotatably connected between the housing 301 and the support plate 302 , the screw rod 307 is threadedly connected to the push block 304 , and a hand wheel 7 located outside the housing 301 is provided at one end of the screw rod 307 away from the support plate 302 .

[0038] See also Figure 2 As shown, the mounting portion 4 includes a plurality of fixed blocks 401 arranged on the horizontal frame 101, and the plurality of fixed blocks 401 are distributed in a rectangular array. The fixed blocks 401 are threadedly connected with anchor bolts 402 inclined toward the middle of the horizontal frame 101, and the anchor bolts 402 on the left and right sides are in an eight-shaped shape. The anchor bolts 402 are used to fix the fixed blocks 401 to the bottom of the rock foundation pit.

[0039] See also Figure 5 and Figure 6As shown, a detection portion 5 is provided at the lower end of the protective vertical plate 201, and the detection portion 5 includes a top block 501 that is horizontally slidably connected to the protective vertical plate 201. A first clearance groove 502 corresponding to the top block 501 is opened at the lower end of the protective inclined plate 202, and the top block 501 extends from the first clearance groove 502. A first wedge block 503 located in the outer shell 301 is provided on the top block 501, and a second wedge block 504 located directly above the first wedge block 503 is provided at the lower end of the connecting plate 203. The end faces of the second wedge block 504 and the adjacent ends of the first wedge block 503 are both inclined surfaces and contact each other. When the top block 501 contacts the side wall of the rock foundation pit and shrinks into the first clearance groove 502, the top block 501 and the first wedge block 503 drive the second wedge block 504 to move upward.

[0040] It is worth noting that the top block 501 includes a fixed part and a movable part which are socketed with each other, and a locking assembly is provided at the connection between the fixed part and the movable part. The locking assembly includes an elastic pin, and the end of the fixed part of the top block 501 away from the first wedge block 503 is located in the first clearance groove 502. When the side wall of the foundation pit is vertical, the movable part is located in the fixed part. When the side wall of the foundation pit is inclined, the movable part extends out of the fixed part. At this time, under the action of the elastic pin in the locking assembly, the movable part and the fixed part are in a fixed connection state, and the end of the movable part away from the fixed part extends out of the first clearance groove 502.

[0041] See also Figure 1 and Figure 3 As shown, two symmetrically distributed horizontal cylinders 8 are provided at the front and rear ends of the vertical frame 102, and a plurality of horizontal columns 9 corresponding to the horizontal cylinders 8 are provided on the protective vertical plate 201. The horizontal cylinders 8 are mounted on the horizontal columns 9 on the corresponding sides, and a baffle 10 is provided at the free end of the horizontal column 9. The baffle 10 is used to prevent the horizontal column 9 from separating from the horizontal cylinder 8.

[0042] When in use, in the initial state, the protective vertical plate 201 is in contact with the vertical frame 102, the protective oblique plate 202 is in contact with the protective vertical plate 201, and the protective oblique plate 202 is located in the vertical plane. After a part of the foundation pit is dug, the staff needs to place the equipment body 1 at the bottom of the dug foundation pit so that the equipment body 1 is between the two side walls of the foundation pit, and the protective oblique plates 202 on the left and right sides are respectively aligned with the two side walls of the foundation pit. At this time, the top block 501 in the detection part 5 has not yet contacted the side wall of the foundation pit.

[0043] The staff uses tools to turn multiple anchor bolts 402 in sequence, thereby fixing the anchor bolts 402 to the bottom of the foundation pit. The anchor bolts 402 connect the fixed blocks 401 to the bottom of the foundation pit. The horizontal frame 101 integrated with multiple fixed blocks 401 is fixed to the bottom of the foundation pit. At this time, the horizontal frame 101 cannot move freely. The staff can first turn the handwheel 7 on one side clockwise. The handwheel 7 drives the screw 307 to rotate clockwise. The screw 307 drives the push block 304 to move and approach the side wall of the foundation pit. The push block 304 slides along two symmetrically distributed cross bars 303. The cross bars 303 limit the push block 304 to move only in the horizontal direction. The push block 304 drives the two plug posts 305 to move in the horizontal direction. In the initial state, the plug post 305 is located in the vertical part of the slide groove 306. When the plug post 305 moves horizontally, it will not move vertically relative to the slide groove 306.

[0044] The two plug posts 305 jointly push the connecting plate 203 to move horizontally toward the side wall of the foundation pit. Since the connecting plate 203 is vertically slidably connected to the protective vertical plate 201, the connecting plate 203 will not slide vertically relative to the protective vertical plate 201 when moving horizontally. The connecting plate 203 drives the protective vertical plate 201 to move horizontally toward the side wall of the foundation pit. The multiple horizontal columns 9 on the connecting plate 203 move horizontally along the horizontal cylinder 8. The free end of the horizontal column 9 is provided with a baffle 10, which can prevent the horizontal column 9 from separating from the horizontal cylinder 8.

[0045] The protective vertical plate 201 drives the protective inclined plate 202 to move laterally, and the distance between the protective inclined plate 202 and the side wall of the foundation pit gradually decreases. At the same time, the protective vertical plate 201 drives the detection part 5 to move laterally, and in the initial state, the top block 501 in the detection part 5 extends out from the first clearance groove 502 on the protective inclined plate 202, that is, the distance between the end of the top block 501 and the side wall of the foundation pit is smaller than the distance between the protective inclined plate 202 and the side wall of the foundation pit. When the top block 501 and the protective inclined plate 202 are close to the side wall of the foundation pit at the same time, the end of the free end of the top block 501 first contacts the side wall of the foundation pit, and the side wall of the foundation pit squeezes the top block 501, causing the top block 501 to shrink into the first clearance groove 502, and the top block 501 drives the first wedge block 503 to move toward the inside of the shell 301. Since the end faces of the second wedge block 504 and the adjacent ends of the first wedge block 503 are both inclined surfaces and contact each other, the first wedge block 503 drives the second wedge block 504 to move upward.

[0046] The second wedge block 504 drives the connecting plate 203 to move upward, and the slide groove 306 moves upward with the connecting plate 203, and relative sliding occurs between the slide groove 306 and the plug column 305. When the top block 501 is completely retracted into the first give way groove 502, the lower end of the protective inclined plate 202 contacts the lower end of the foundation pit side wall, and the plug column 305 moves to the connection between the vertical part and the inclined part of the slide groove 306.

[0047] That is, the detection part 5 can detect the contact status between the lower end of the protective inclined plate 202 and the side wall of the foundation pit. When the protective inclined plate 202 contacts the side wall of the foundation pit, the adjustment part 3 can stop driving the protective vertical plate 201 and the protective inclined plate 202 to move horizontally, and instead drive the upper part of the protective inclined plate 202 to swing.

[0048] The staff continues to turn the handwheel 7 clockwise, and the two plug posts 305 continue to move horizontally. At this time, the plug posts 305 enter the inclined part of the slide groove 306, and the plug posts 305 continue to drive the connecting plate 203 to move upward, while the protective vertical plate 201 is in a stationary state. The connecting plate 203 drives the two connecting rods 204 to move upward. Since the upper end of the connecting rod 204 is hinged to the protective inclined plate 202, and the bottom end of the protective inclined plate 202 is hinged to the protective vertical plate 201, the upper end of the connecting rod 204 begins to push the protective inclined plate 202 to swing, and the angle between the protective inclined plate 202 and the protective vertical plate 201 gradually increases, and the angle between the protective inclined plate 202 and the side wall of the foundation pit gradually decreases to adapt to the side walls of the foundation pit at different angles.

[0049] When the protective inclined plate 202 is in contact with the side wall of the foundation pit as a whole, stop turning the handwheel 7. Since the threaded connection between the screw 307 and the push block 304 is self-locking, the protective inclined plate 202 remains in contact with the side wall of the foundation pit. The protective inclined plate 202 can provide good support and protection for the side wall of the foundation pit, and multiple anchor bolts 402 are inclined, and the anchor bolts 402 on the left and right sides are in an eight-shaped shape, which can produce a better downward pressure effect. The staff repeats the above operation steps to support and protect the side wall of the foundation pit on the other side.

[0050] Moreover, during the supporting process, the lower end of the protective inclined plate 202 first contacts the inclined side wall of the foundation pit, and then the upper end of the protective inclined plate 202 swings to a state parallel to the side wall of the foundation pit, so that the supporting force of the protective inclined plate 202 on the side wall of the foundation pit is evenly distributed, preventing the relatively soft soil layer on the side wall of the foundation pit from falling off, and maintaining a good supporting effect on the side wall of the foundation pit. It can be applied to side walls of foundation pits with different degrees of inclination, and the effect is better than the method of adjusting the support angle first in the existing technology.

[0051] Example 2

[0052] In the above embodiment, although the two protective inclined plates 202 can provide good support and protection for the side walls of the foundation pit, some workers need to work in the foundation pit, and the above device lacks a protective structure for the construction workers in the foundation pit. The excavation process will disturb the stratum, causing the soil and stones near the foundation pit to loosen. These stones may fall into the foundation pit and injure people, posing a certain safety hazard.

[0053] See also Figure 1 、 Figure 3 and Figure 9As shown, an anti-drop mechanism 6 is provided at the upper end of the protective riser 201. The anti-drop mechanism 6 comprises a protective frame 601 hinged to the protective riser 201. A protective net 602 is provided within the protective frame 601. A flat plate 603 extending in the front-to-back direction is provided at the lower end of the protective frame 601. Two symmetrically distributed pressure rods 604 are hinged at the lower end of the flat plate 603. The free ends of the pressure rods 604 are hinged to the upper end of the vertical frame 102. The two anti-drop mechanisms 6 are staggered in an upper and lower arrangement.

[0054] On the basis of the above embodiment, during use, when the staff rotates the handwheel 7 clockwise, the handwheel 7 drives the screw 307 to rotate clockwise, and the screw 307 drives the push block 304 to move toward the direction close to the side wall of the foundation pit, and the push block 304 drives the two plug posts 305 to move in the horizontal direction. When the plug posts 305 are located in the vertical part of the slide groove 306, the plug posts 305 drive the connecting plate 203 to move in the horizontal direction, and the connecting plate 203 drives the protective vertical plate 201 to move toward the direction close to the side wall of the foundation pit, and the protective vertical plate 201 drives the anti-drop mechanism 6 to move in the horizontal direction.

[0055] When the anti-drop mechanism 6 moves in the horizontal direction, since the lower end of the flat plate 603 is hinged with two symmetrically distributed pressure rods 604, and the free ends of the pressure rods 604 are hinged to the vertical frame 102, the vertical frame 102 and the horizontal frame 101 are an integrated structure, and are fixed to the bottom of the foundation pit by the mounting part 4. At this time, they cannot move horizontally. When the flat plate 603 moves in the horizontal direction with the protection frame 601, the pressure rods 604 will swing upward, and the protection frame 601 and the flat plate 603 swing upward due to the upward support of the pressure rods 604, and the angle between the protection net 602 inside the protection frame 601 and the horizontal plane gradually increases.

[0056] When the protective vertical plate 201 stops moving, the protective frame 601 and the protective net 602 stop swinging upward. At this time, the protective frame 601 and the protective net 602 are in a tilted state. The staff turns the handwheel 7 on the other side clockwise to drive the protective frame 601 and the protective net 602 on the other side to swing to a tilted state, and the two protective nets 602 are in an eight-shape. Since the two anti-drop mechanisms 6 are staggered up and down, the two protective frames 601 can be prevented from colliding.

[0057] Workers can work under the two protection nets 602. When the soil and stones near the foundation pit become loose and fall during the excavation process, the protection nets 602 can prevent the soil and stones from hitting the workers. Moreover, the protection nets 602 are inclined, and the soil and stones will roll along the inclined protection nets 602 and finally fall from between the protective vertical plate 201 and the protective inclined plate 202. The inclined protection nets 602 can prevent soil and stones from accumulating on top, thereby avoiding affecting the normal use of the support part 2.

[0058] Example 3

[0059] In the above embodiment, when the protective equipment needs to be taken out from the foundation pit, the adjustment part 3 is required to drive the protective vertical plate 201 and the protective inclined plate 202 back to the initial position. However, after the plug post 305 moves from the inclined part of the slide groove 306 to the vertical part of the slide groove 306, the connecting plate 203 cannot automatically move downward and reset, resulting in the top block 501 in the detection part 5 unable to extend out of the first yield groove 502, which will affect the next use of the device.

[0060] See also Figure 4 As shown, two symmetrically distributed movable grooves 11 are provided on the protective vertical plate 201, and upper and lower axial guide columns 12 are provided in the movable grooves 11. The connecting plate 203 is slidably connected to the two guide columns 12. The guide columns 12 are provided with a return spring 13 located between the connecting plate 203 and the upper end of the movable groove 11. The return spring 13 always drives the connecting plate 203 close to the lower end of the movable groove 11. A second make way groove 14 is provided on the protective vertical plate 201, and the connecting rod 204 passes through the center of the second make way groove 14.

[0061] It is worth noting that when the protective inclined plate 202 is fitted with the protective vertical plate 201, a movable gap is set between the hinge point between the connecting rod 204 and the protective inclined plate 202 and the upper side wall of the second clearance groove 14, thereby avoiding collision between the hinge point and the upper side wall of the second clearance groove 14.

[0062] Based on the above embodiment, during use, when the connecting plate 203 moves upward, the rear end of the connecting plate 203 slides upward along two symmetrically distributed guide columns 12, and at the same time, the connecting plate 203 squeezes the return spring 13 in the movable groove 11 upward, and the connecting plate 203 drives the protective inclined plate 202 to move and unfold, thereby fitting with the side wall of the foundation pit.

[0063] When the staff needs to take the protective equipment out of the foundation pit, they turn the handwheel 7 counterclockwise, and the handwheel 7 drives the screw 307 to rotate counterclockwise. The screw 307 drives the push block 304 to move away from the side wall of the foundation pit, and the push block 304 drives the two plug posts 305 to move away from the side wall of the foundation pit. The plug posts 305 are in the inclined part of the slide groove 306 at this time. When the plug posts 305 move horizontally, they drive the connecting plate 203 to move downward along the guide column 12, and the reset spring 13 gradually restores its initial length. The connecting plate 203 drives the connecting rod 204 to move downward, and the connecting rod 204 drives the protective inclined plate 202 to swing away from the side wall of the foundation pit.

[0064] When the plug post 305 moves to the lower end of the vertical part of the slide groove 306, the protective inclined plate 202 fits with the protective vertical plate 201. At this time, the return spring 13 drives the connecting plate 203 to continue to move downward, and the connecting plate 203 drives the second wedge block 504 to move downward. The second wedge block 504 squeezes the first wedge block 503, and the first wedge block 503 drives the top block 501 to extend out of the first clearance groove 502.

[0065] When the column 305 is located at the upper end of the vertical part of the slide groove 306, the top block 501 returns to the initial state, and the column 305 begins to drive the connecting plate 203 to move horizontally. When the connecting plate 203 drives the protective vertical plate 201 and the protective inclined plate 202 to return to the initial position, stop turning the handwheel 7, and the staff can repeat the above operation steps to make the protective inclined plate 202 and the protective vertical plate 201 on the other side return to the initial position.

[0066] Finally, the staff only needs to use tools to separate the multiple anchor bolts 402 from the bottom of the foundation pit, and then the equipment body 1 can be taken out from the inside of the foundation pit.

[0067] To sum up, through the arrangement of the detection part 5 and the support part 2, when the top block 501 in the detection part 5 is retracted into the first give way groove 502, the protective vertical plate 201 stops moving, and the lower end of the protective inclined plate 202 contacts the side wall of the foundation pit, and the adjustment part 3 drives the protective inclined plate 202 to swing, so that the protective inclined plate 202 fits with the side wall of the foundation pit, so that the protective inclined plate 202 forms a uniformly distributed supporting force on the side wall of the foundation pit, plays a good supporting and protective role on the side wall of the foundation pit, prevents the relatively soft soil layer on the side wall of the foundation pit from falling off, and maintains a good supporting effect on the side wall of the foundation pit. It can be applied to the side walls of the foundation pit with different degrees of inclination, and has better use effect than the existing method of adjusting the angle first and then supporting. Through the arrangement of the adjustment part 3, the staff only needs to turn the hand wheel 7 to drive the protective inclined plate 202 to support and protect the side walls of the foundation pit at different angles. , which brings convenience to the use of the staff. Through the setting of the anti-fall mechanism 6, when the soil and stones near the foundation pit become loose and fall during the excavation process, the protection net 602 can prevent the soil and stones from hitting the staff. The protection net 602 is inclined, and the soil and stones will roll along the inclined protection net 602 and finally fall between the protection vertical plate 201 and the protection inclined plate 202. Moreover, the inclined protection net 602 can prevent the soil and stones from piling up on top, thereby avoiding affecting the normal use of the support part 2. Through the setting of the reset spring 13, when the equipment is stopped, the staff only needs to turn the handwheel 7 counterclockwise to automatically return the connecting plate 203 and the detection part 5 to the initial position, thereby facilitating the staff to use it next time. Through the setting of the reinforcing rib 15, the connection strength between the horizontal frame 101 and the vertical frame 102 can be increased.

[0068] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rock foundation pit excavation protection device, characterized in that: include: The device body includes a horizontal frame and two vertical frames, wherein the two vertical frames are symmetrically arranged at the left and right ends of the horizontal frame; The support portion includes two protective vertical plates parallel to the vertical frames and connected in a transverse sliding manner. The two vertical frames are located between the two protective vertical plates. A protective oblique plate is hingedly connected to the side of the lower end of the protective vertical plate away from the vertical frame. A connecting plate is vertically slidably connected to the side of the protective vertical plate close to the vertical frame. The upper end of the connecting plate is hingedly connected to two symmetrically distributed connecting rods. The free ends of the connecting rods pass through the protective vertical plates and are hingedly connected to the protective oblique plate. An adjusting portion is disposed between the horizontal frame and the vertical frame. The adjusting portion is used to drive the connecting plate to move. When the adjusting portion drives the connecting plate to move horizontally until the lower portion of the protective vertical plate contacts the side wall of the rock foundation pit, the connecting plate changes from a horizontal direction to a vertical direction to change the inclination angle of the protective inclined plate. The adjusting portion includes a housing disposed between the horizontal frame and the vertical frame. A mounting portion, which is used to fix the device body to the bottom of the rock foundation pit; The lower end of the protective vertical plate is provided with a detection portion, which includes a top block connected to the protective vertical plate in a transverse sliding manner, a first clearance groove corresponding to the top block is opened at the lower end of the protective inclined plate, the top block extends from the first clearance groove, a first wedge block located in the shell is provided on the top block, and a second wedge block is provided at the lower end of the connecting plate and located directly above the first wedge block. The end surfaces of the second wedge block and the first wedge block at the adjacent ends are both inclined surfaces and contact each other. When the top block contacts the side wall of the rock foundation pit and shrinks into the first clearance groove, the top block and the first wedge block drive the second wedge block to move upward; The top block includes a fixed part and a movable part which are socketed with each other. A locking assembly is provided at the connection between the fixed part and the movable part. The locking assembly includes an elastic pin. The end of the fixed part of the top block away from the first wedge block is located in the first give way groove. When the side wall of the foundation pit is vertical, the movable part is located in the fixed part. When the side wall of the foundation pit is inclined, the movable part extends out of the fixed part. At this time, under the action of the elastic pin in the locking assembly, the movable part and the fixed part are in a fixed connection state, and the end of the movable part away from the fixed part extends out of the first give way groove.

2. The excavation protection device for rock foundation pit according to claim 1, characterized in that: A support plate is provided on the left side of the shell, and two symmetrically distributed cross bars are provided between the support plate and the right side wall of the shell. Push blocks are slidably connected to the two cross bars, and front and rear axial plug columns are provided at the front and rear ends of the push blocks. Slide grooves are provided at the front and rear ends of the connecting plate, and the plug columns are located in the slide grooves, and the plug columns are located in the vertical part of the slide grooves.

3. The excavation protection device for rock foundation pit according to claim 2, characterized in that: A screw rod located between the two cross bars is rotatably connected between the shell and the support plate. The screw rod is threadedly connected to the push block. A hand wheel located outside the shell is provided at one end of the screw rod away from the support plate.

4. The excavation protection device for rock foundation pit according to claim 3, characterized in that: The mounting portion includes a plurality of fixed blocks arranged on a horizontal frame, and the plurality of fixed blocks are distributed in a rectangular array. The fixed blocks are threadedly connected with anchor bolts inclined toward the middle of the horizontal frame. The anchor bolts are used to fix the fixed blocks to the bottom of the rock foundation pit.

5. The excavation protection device for rock foundation pit according to claim 4, characterized in that: An anti-drop mechanism is provided on the upper end of the protective vertical plate. The two anti-drop mechanisms are staggered up and down. The anti-drop mechanism includes a protection frame hinged to the protective vertical plate, and a protection net is provided inside the protection frame.

6. The excavation protection device for rock foundation pit according to claim 5, characterized in that: A flat plate in the front-to-back direction is provided at the lower end of the protection frame. Two symmetrically distributed compression rods are hinged at the lower end of the flat plate, and the free ends of the compression rods are hinged to the upper end of the vertical frame.

7. The excavation protection device for rock foundation pit according to claim 6, characterized in that: Two symmetrically distributed horizontal cylinders are provided at the front and rear ends of the vertical frame. A plurality of horizontal columns corresponding to the horizontal cylinders are provided on the protective vertical plate. The horizontal cylinders are sleeved on the horizontal columns on the corresponding sides. A baffle is provided at the free end of the horizontal column to prevent the horizontal column from separating from the horizontal cylinder.

8. The excavation protection device for rock foundation pit according to claim 7, characterized in that: Two symmetrically distributed movable grooves are provided on the protective vertical plate, and upper and lower axial guide columns are provided in the movable grooves. The connecting plate is slidably connected to the two guide columns. A reset spring is mounted on the guide column and is located between the connecting plate and the upper end of the movable groove. The reset spring always drives the connecting plate close to the lower end of the movable groove. A second give way groove is provided on the protective vertical plate, and the connecting rod passes through the center of the second give way groove.

9. The excavation protection device for rock foundation pit according to claim 8, characterized in that: Reinforcement ribs are provided at the front and rear ends between the horizontal frame and the vertical frame, and the reinforcement ribs are used to enhance the connection strength between the horizontal frame and the vertical frame.

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