Combined supporting device for foundation pit slope

Abstract

The application relates to the technical field of foundation pit support, and discloses a combined supporting device for a foundation pit slope, which comprises a positioning column, the front end of the positioning column is fixedly provided with a connecting frame, the front end of the connecting frame is fixedly provided with a protective plate, a buffer assembly is arranged on the protective plate, six groups of pressure relief assemblies are arranged on the buffer assembly, rotating plates are movably arranged on the two sides of the protective plate, a clamping groove is formed in one group of the two groups of rotating plates, a clamping rod is fixedly arranged on the other group of the two groups of rotating plates, the buffer assembly comprises two groups of triangular plates fixedly arranged at the rear end of the protective plate, one group of shaft seats is fixedly arranged at the opposite ends of the two groups of triangular plates, a cylinder is movably arranged on the shaft seat, and an abutting block is movably arranged on the inner side of the cylinder. The combined supporting device for the foundation pit slope can reduce the safety risks of foundation pit slope instability and supporting collapse through the cooperation of the buffer assembly and the pressure relief assembly.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to a combined support device for foundation pit slopes. Background Technology

[0002] In the construction of foundation pit slopes, combined support devices are widely used to retain soil and resist lateral pressure. However, their existing structures still have significant defects and are difficult to adapt to the dynamic changes in soil pressure during foundation pit construction. The existing combined support devices mostly use fixed retaining structures for the protective plates, lacking active pressure relief mechanisms. When local soil pressure on the foundation pit wall increases, the protective plates are prone to deformation and misalignment due to concentrated stress, even leading to instability of the support system. Traditional treatment methods are mostly passive reinforcement; blindly treating the pressure-bearing area may also cause local collapse of the foundation pit wall, further exacerbating the support risks. Simultaneously, the existing combined support devices are susceptible to erosion between the protective plates and the foundation pit wall by rainwater, leading to soil softening and uneven pressure distribution, further increasing the probability of excessive local pressure. They cannot achieve coordinated protection of dynamic pressure regulation and support stability, failing to meet the safety and stability requirements of foundation pit slope support. Summary of the Invention

[0003] The main objective of this invention is to provide a combined support device for foundation pit slopes, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A combined support device for foundation pit slope includes a positioning column, a connecting frame fixedly mounted at the front end of the positioning column, a protective plate fixedly mounted at the front end of the connecting frame, a buffer assembly mounted on the protective plate, six sets of pressure relief components mounted on the buffer assembly, rotating plates movably mounted on both sides of the protective plate, one set of the rotating plates having a locking groove, and the other set of the rotating plates having a locking rod fixedly mounted on it. The buffer assembly includes two sets of triangular plates fixedly mounted at the rear end of the protective plate, a set of bearing seats fixedly mounted at opposite ends of the two sets of triangular plates, a cylinder movably mounted on the bearing seats, an abutment block movably mounted on the inner side of the cylinder, a connector fixedly mounted on the upper end of the abutment block, a buffer spring sleeved between the outer abutment block and the upper inner wall of the cylinder, a movable shaft movably mounted on the upper side of the connector, an arc-shaped opening on the triangular plate corresponding to the position of the movable shaft, a scale gauge on one end of the triangular plate corresponding to the position of the arc-shaped opening, and a buffer plate fixedly mounted between the two sets of movable shafts.

[0006] Preferably, the pressure relief assembly includes a square groove located in the middle of the buffer plate. Six sets of circular grooves are arranged on both sides of the square groove on the inner side of the buffer plate. A soil inlet is provided at the front of each circular groove. An open cylinder is movably arranged on the inner side of each circular groove. A sleeve block is fixedly arranged at one end of each pair of laterally adjacent open cylinders. A positioning strip is movably arranged on the inner side of each pair of sleeve blocks. A first spring is fixedly arranged between each pair of positioning strips and each pair of sleeve blocks. A U-shaped frame is fixedly arranged at the rear end of each pair of positioning strips. A connecting rod is movably arranged between the six U-shaped frames. Two sets of gear rings are fixedly arranged at the center of each of the six circular grooves on the inner side of the square groove.

[0007] Preferably, two sets of fixed seats are fixedly installed at the rear end of the buffer plate on the upper side of the square groove. Handles are movably installed on the inner side of the two sets of fixed seats. A single synchronous pulley is fixedly installed on the handle. Reciprocating screws are rotatably installed on the inner side of the two sets of gear rings and the corresponding two sets of transverse open cylinders. Double synchronous pulleys are fixedly installed on the outer side of the reciprocating screws between the two sets of gear rings. Synchronous belts are fitted onto the double synchronous pulleys and single synchronous pulleys on the six sets of reciprocating screws. Two sets of sliding rods are fixedly installed near the upper side of the inner side of each open cylinder. Sliding blocks are slidably installed on the two sets of sliding rods. Movable grooves are opened on both sides of the sliding blocks. Movable blocks are movably installed on the inner side of the two sets of movable grooves. Rake teeth blocks are fixedly installed on the upper side of the two sets of movable blocks. Two sets of second springs are fixedly installed between the rake teeth blocks and the sliding blocks.

[0008] Preferably, the engaging rod is adapted to the engaging groove, and the cylinder is inclined.

[0009] Preferably, the movable shaft passes through the inner side of the arc-shaped opening and connects to the buffer plate, and the lower side of the buffer plate is movably connected to the guard plate.

[0010] Preferably, the opening cylinder covers the soil inlet position, the opening cylinder fits into the circular groove, and the two sets of positioning strips are engaged and restricted in the gear ring.

[0011] Preferably, the reciprocating lead screw passes laterally through the interior of the two open cylinders, and two mirror-symmetrical guide grooves are provided on the outer side of the reciprocating lead screw. The lower side of the slide block is engaged in the guide groove of the reciprocating lead screw, and the movable block is adapted to the movable groove.

[0012] Preferably, the front and rear sides of the rake tooth block are inclined, the rake tooth block corresponds to the opening position on the upper side of the opening cylinder, the rake tooth block rests on the inner wall of the circular groove, and the second spring is in a compressed state.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. When installing another set of guard plates, another set of locking rods can be inserted into the locking groove to achieve the combined installation of each set of guard plates. The two sets of guard plates are connected by a rotating plate, so they can be assembled smoothly even if the pit wall is uneven. The mutual traction between the components enhances the support effect on the pit slope. At the same time, the buffer plate is connected to the connector through two sets of movable shafts. When subjected to large soil pressure, the buffer plate is pushed by the soil and drives the movable shaft to slide along the arc. The connector and the abutment block simultaneously compress the buffer spring. With the help of the elastic deformation of the buffer plate and the reading of the scale, the pressure state at the point can be intuitively judged, which makes it easy for the staff to deal with it in time.

[0015] 2. When the local pressure in the foundation pit is too high and the scale indicates that pressure relief is needed, push the connecting rod downwards to make the six sets of U-shaped frames slide along the sleeve block and squeeze the first spring. This releases the positioning strip from its engagement with the gear ring. Then, the U-shaped frames drive the two side opening cylinders to rotate upwards. After the upper notch of the opening cylinder aligns with the soil inlet, the elastic rebound of the first spring causes the positioning strip to re-engage with the gear ring to complete the positioning. At this point, the overlapping opening cylinders and soil inlet can discharge the loose soil in the local area, effectively reducing the soil pressure at that location.

[0016] 3. As the opening cylinder rotates, the second spring, which is in a compressed state, pushes the rake teeth upward. The rake teeth slide along the movable groove and pass through the inside of the soil inlet to contact the soil on the pit wall. Turning the handle can drive the single synchronous wheel to rotate, and drive the double synchronous wheel connected below to rotate through the synchronous belt. The six sets of double synchronous wheels achieve linkage and synchronous rotation through the synchronous belt. The rotating synchronous belt further drives the sliding blocks on both sides to move closer or further apart along the sliding rod, so that the rake teeth can perform reciprocating rakeing and loosening operations on the hardened and compacted soil. With the elastic reset of the second spring, the local soil pressure is released, which effectively reduces the safety risks of slope instability and support collapse of the foundation pit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a combined support device for foundation pit slope according to the present invention.

[0018] Figure 2 This is a side view of a combined support device for foundation pit slope according to the present invention.

[0019] Figure 3 This is a schematic diagram of the inner structure of the buffer plate of a combined support device for foundation pit slope according to the present invention.

[0020] Figure 4 This invention relates to a combined support device for foundation pit slopes. Figure 3 A magnified structural diagram of part A;

[0021] Figure 5This is a partially enlarged structural diagram of the pressure relief component of a combined support device for foundation pit slopes according to the present invention;

[0022] Figure 6 This is a schematic diagram of the open cylinder unfolding structure of a combined support device for foundation pit slope according to the present invention;

[0023] Figure 7 This invention relates to a combined support device for foundation pit slopes. Figure 5 A schematic diagram of the enlarged structure of part B;

[0024] Figure 8 This is a partial structural diagram of the pressure relief component of a combined support device for foundation pit slopes according to the present invention;

[0025] Figure 9 This invention relates to a combined support device for foundation pit slopes. Figure 5 A magnified structural diagram of section C;

[0026] Figure 10 This is a partial cross-sectional schematic diagram of the pressure relief component of a combined support device for foundation pit slopes according to the present invention.

[0027] In the diagram: 1. Positioning post; 2. Connecting frame; 3. Guard plate; 4. Buffer assembly; 41. Triangular plate; 42. Shaft seat; 43. Cylinder; 44. Abutment block; 45. Connector; 46. Buffer spring; 47. Movable shaft; 48. Arc opening; 49. Scale; 410. Buffer plate; 5. Pressure relief assembly; 51. Square groove; 52. Circular groove; 53. Soil inlet; 54. Opening cylinder; 55. Sleeve block; 56. Positioning strip; 57. First spring; 58. U-shaped frame; 59. Connecting rod; 510. Gear ring; 511. Fixed seat; 512. Handle; 513. Single synchronous pulley; 514. Reciprocating lead screw; 515. Double synchronous pulley; 516. Synchronous belt; 517. Slide rod; 518. Slide seat; 519. Movable groove; 520. Movable block; 521. Rake tooth block; 522. Second spring; 6. Rotating plate; 7. Engaging groove; 8. Engaging rod. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship as a relative relationship of orientation or position, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0030] Please see Figures 1-10 One embodiment of the present invention provides a combined support device for a foundation pit slope, comprising a positioning column 1, a connecting frame 2 fixedly mounted at the front end of the positioning column 1, a protective plate 3 fixedly mounted at the front end of the connecting frame 2, a buffer assembly 4 mounted on the protective plate 3, six sets of pressure relief assemblies 5 mounted on the buffer assembly 4, rotating plates 6 movably mounted on both sides of the protective plate 3, one set of rotating plates 6 having a locking groove 7, and the other set of rotating plates 6 having a locking rod 8 fixedly mounted on it. The buffer assembly 4 includes two sets of triangular plates 41 fixedly mounted at the rear end of the protective plate 3, the two sets of triangular plates 41 being connected to each other. A set of bearing seats 42 is fixedly provided at one end of each of the two sets of bearing seats 42. A cylinder 43 is movably provided on the bearing seat 42. An abutment block 44 is movably provided on the inner side of the cylinder 43. A connector 45 is fixedly provided on the upper end of the abutment block 44. A buffer spring 46 is sleeved between the abutment block 44 and the upper inner wall of the cylinder 43 on the outer side of the connector 45. A movable shaft 47 is movably provided on the upper side of the connector 45. An arc-shaped opening 48 is opened on the triangle plate 41 corresponding to the position of the movable shaft 47. A scale 49 is provided on one end of the triangle plate 41 corresponding to the position of the arc-shaped opening 48. A buffer plate 410 is fixedly provided between the two sets of movable shafts 47.

[0031] The locking rod 8 is adapted to the locking groove 7, the cylinder 43 is inclined, the movable shaft 47 passes through the inner side of the arc opening 48 and is connected to the buffer plate 410, and the lower side of the buffer plate 410 is movably connected to the guard plate 3.

[0032] When installing another set of guard plates 3, another set of locking rods 8 can be inserted into the locking groove 7 to achieve the combined installation of each set of guard plates 3. The two sets of guard plates 3 are connected by rotating plates 6, and can be assembled smoothly even if the pit wall is uneven. The mutual traction between the components enhances the support effect on the pit slope. At the same time, the buffer plate 410 is connected to the connector 45 through two sets of movable shafts 47. When subjected to large soil pressure, the buffer plate 410 is pushed by the soil and drives the movable shaft 47 to slide along the arc opening 48. The connector 45 and the abutment block 44 simultaneously compress the buffer spring 46. With the help of the elastic deformation of the buffer plate 410 and the reading indication of the scale 49, the pressure state at this point can be intuitively judged, which makes it convenient for the staff to take timely action.

[0033] The pressure relief assembly 5 includes a square groove 51 located in the middle of the buffer plate 410. Six sets of circular grooves 52 are provided on both sides of the square groove 51 on the inner side of the buffer plate 410. A soil inlet 53 is opened on the front side of the circular groove 52. An open cylinder 54 is movably arranged on the inner side of the circular groove 52. A sleeve block 55 is fixedly arranged at one end of each of the two sets of horizontally adjacent open cylinders 54. A positioning strip 56 is movably arranged on the inner side of each of the two sets of sleeve blocks 55. A first spring 57 is fixedly arranged between each of the two sets of positioning strips 56 and the two sets of sleeve blocks 55. A U-shaped frame 58 is fixedly arranged at the rear end of each of the two sets of positioning strips 56. A connecting rod 59 is movably arranged between the six sets of U-shaped frames 58. Two sets of gear rings 510 are fixedly arranged on the inner side of the square groove 51 at the center position of each of the six sets of circular grooves 52.

[0034] The opening cylinder 54 blocks the position of the soil inlet 53. The opening cylinder 54 fits into the circular groove 52, and the two sets of positioning strips 56 are engaged and restricted in the gear ring 510.

[0035] When the local pressure in the foundation pit is too high, and the scale 49 indicates that pressure relief is needed, the connecting rod 59 is pushed downwards, causing the six sets of U-shaped frames 58 to slide along the sleeve block 55 and squeeze the first spring 57. This releases the positioning strip 56 from its engagement with the gear ring 510. Then, the U-shaped frame 58 drives the two side opening cylinders 54 to rotate upwards. After the upper notch of the opening cylinder 54 aligns with the soil inlet 53, the elastic rebound of the first spring 57 causes the positioning strip 56 to re-engage with the gear ring 510 to complete the positioning. At this time, the overlapping opening cylinders 54 and soil inlet 53 can discharge the local loose soil, effectively reducing the soil pressure at that location.

[0036] Two sets of fixing seats 511 are fixedly installed at the rear end of the buffer plate 410, located on the upper side of the square groove 51. Handles 512 are movably installed on the inner side of the two sets of fixing seats 511. A single synchronous pulley 513 is fixedly installed on the handle 512. Reciprocating screws 514 are rotatably installed on the inner side of the two sets of gear rings 510 and the corresponding transverse open cylinders 54. Double synchronous pulleys 515 are fixedly installed on the outer side of the reciprocating screws 514, located between the two sets of gear rings 510. The double synchronous pulleys on the six sets of reciprocating screws 514... Synchronous belts 516 are fitted onto 515 and 513. Two sets of slide rods 517 are fixedly installed inside the open cylinder 54 near the upper side. Slide seats 518 are slidably installed on the two sets of slide rods 517. Movable grooves 519 are opened on both sides of the slide seats 518. Movable blocks 520 are movably installed inside the two sets of movable grooves 519. Rake teeth blocks 521 are fixedly installed on the upper side of the two sets of movable blocks 520. Two sets of second springs 522 are fixedly installed between the rake teeth blocks 521 and the slide seats 518.

[0037] The reciprocating screw 514 passes laterally through the interior of the two open cylinders 54. Two mirror-symmetrical guide grooves are provided on the outer side of the reciprocating screw 514. The lower side of the slide block 518 is engaged in the guide groove of the reciprocating screw 514. The movable block 520 is adapted to the movable groove 519. The front and rear sides of the rake tooth block 521 are inclined. The rake tooth block 521 corresponds to the upper opening position of the open cylinder 54. The rake tooth block 521 is pressed against the inner wall of the circular groove 52. The second spring 522 is in a compressed state.

[0038] As the opening cylinder 54 rotates, the second spring 522, which is in a compressed state, pushes the rake teeth 521 upward. The rake teeth 521 slides along the movable groove 519 and passes through the inner side of the soil inlet 53 to contact the soil on the pit wall. Turning the handle 512 can drive the single synchronous wheel 513 to rotate, and drive the double synchronous wheel 515 connected below to rotate through the synchronous belt 516. The six sets of double synchronous wheels 515 achieve linkage and synchronous rotation through the synchronous belt 516. The rotating synchronous belt 516 further drives the two side sliding seats 518 to move closer or further apart along the sliding rod 517, so that the rake teeth 521 can perform reciprocating rakeing and loosening operations on the hardened and compacted soil. With the elastic reset of the second spring 522, the local soil pressure is released, which effectively reduces the safety risks of pit slope instability and support collapse.

[0039] Working principle: When using, when installing another set of guard plates 3, another set of locking rods 8 can be inserted into the locking groove 7 to realize the combined installation of each set of guard plates 3. The two sets of guard plates 3 are connected by rotating plates 6. Even if there is unevenness in the pit wall, they can be assembled smoothly. The mutual traction between the components enhances the support effect on the pit slope. At the same time, the buffer plate 410 is connected to the connector 45 through two sets of movable shafts 47. When subjected to large soil pressure, the buffer plate 410 is pushed by the soil and drives the movable shaft 47 to slide along the arc opening 48. The connector 45 and the abutment block 44 simultaneously compress the buffer spring 46. With the help of the elastic deformation of the buffer plate 410 and the reading indication of the scale 49, the pressure state at this point can be intuitively judged, which makes it easy for the staff to take timely action. When the local pressure in the foundation pit is too high, and the scale 49 indicates that pressure relief is needed, the connecting rod 59 is pushed downwards, causing the six sets of U-shaped frames 58 to slide along the sleeve block 55 and squeeze the first spring 57. This releases the positioning strip 56 from its engagement with the gear ring 510. Then, the U-shaped frame 58 drives the two side opening cylinders 54 to rotate upwards. After the upper notch of the opening cylinder 54 aligns with the soil inlet 53, the elastic rebound of the first spring 57 causes the positioning strip 56 to re-engage with the gear ring 510 to complete the positioning. At this time, the overlapping opening cylinders 54 and soil inlet 53 can discharge the local loose soil, effectively reducing the soil pressure at that location. Meanwhile, as the opening cylinder 54 rotates, the second spring 522, which is in a compressed state, pushes the rake teeth 521 upward. The rake teeth 521 slides along the movable groove 519 and passes through the inner side of the soil inlet 53 to contact the soil on the pit wall. Turning the handle 512 can drive the single synchronous wheel 513 to rotate, and drive the double synchronous wheel 515 connected below to rotate through the synchronous belt 516. The six sets of double synchronous wheels 515 achieve linkage and synchronous rotation through the synchronous belt 516. The rotating synchronous belt 516 further drives the two sliding seats 518 to move closer or further apart along the sliding rod 517, so that the rake teeth 521 can perform reciprocating rakeing and loosening operations on the hardened and compacted soil. With the elastic reset of the second spring 522, the local soil pressure is released, which effectively reduces the safety risks of slope instability and support collapse of the foundation pit.

[0040] The component connection method or electrical control method in this invention are common knowledge in the field, and their working principle is already a well-known technology. The appropriate model is selected according to actual use, so it will not be explained in detail.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combined support device for foundation pit slopes, comprising positioning columns (1), characterized in that: A connecting frame (2) is fixedly installed at the front end of the positioning column (1), a guard plate (3) is fixedly installed at the front end of the connecting frame (2), a buffer assembly (4) is installed on the guard plate (3), six sets of pressure relief assemblies (5) are installed on the buffer assembly (4), rotating plates (6) are movably installed on both sides of the guard plate (3), one set of the two sets of rotating plates (6) has a locking groove (7), and the other set of the two sets of rotating plates (6) is fixedly installed with a locking rod (8). The buffer assembly (4) includes two sets of triangular plates (41) fixedly installed at the rear end of the guard plate (3), and a set of bearing seats (42) is fixedly installed at opposite ends of the two sets of triangular plates (41). A cylinder (43) is movably mounted on the shaft seat (42). An abutment block (44) is movably mounted on the inner side of the cylinder (43). A connector (45) is fixedly mounted on the upper end of the abutment block (44). A buffer spring (46) is sleeved between the abutment block (44) on the outer side of the connector (45) and the upper inner wall of the cylinder (43). A movable shaft (47) is movably mounted on the upper side of the connector (45). An arc-shaped opening (48) is opened on the triangle plate (41) corresponding to the position of the movable shaft (47). A scale (49) is set on one end of the triangle plate (41) corresponding to the position of the arc-shaped opening (48). A buffer plate (410) is fixedly mounted between the two sets of movable shafts (47).

2. The combined support device for foundation pit slope according to claim 1, characterized in that: The pressure relief assembly (5) includes a square groove (51) located in the middle of the buffer plate (410). Six sets of circular grooves (52) are provided on both sides of the square groove (51) inside the buffer plate (410). A soil inlet (53) is provided on the front side of the circular groove (52). An open cylinder (54) is movably provided on the inner side of the circular groove (52). A sleeve block (55) is fixedly provided at one end of each of the two sets of horizontally adjacent open cylinders (54). A positioning strip (56) is movably provided on the inner side of each of the two sets of sleeve blocks (55). A first spring (57) is fixedly provided between each of the two sets of positioning strips (56) and the two sets of sleeve blocks (55). A U-shaped frame (58) is fixedly provided at the rear end of each of the two sets of positioning strips (56). A connecting rod (59) is movably provided between the six sets of U-shaped frames (58). Two sets of gear rings (510) are fixedly provided on the inner side of the square groove (51) at the center position of each of the six sets of circular grooves (52).

3. The combined support device for foundation pit slope according to claim 2, characterized in that: The buffer plate (410) has two sets of fixed seats (511) fixedly installed at the rear end of the square groove (51) on the upper side. The inner side of the two sets of fixed seats (511) is movably provided with handles (512). A single synchronous pulley (513) is fixedly installed on the handle (512). The two sets of gear rings (510) and the corresponding two sets of transverse open cylinders (54) are rotatably provided with reciprocating screws (514). The outer side of the reciprocating screws (514) is fixedly provided with double synchronous pulleys (515) at the position between the two sets of gear rings (510). The double synchronous pulleys (515) on the six sets of reciprocating screws (514) are fixedly provided with handles (512). 15) A timing belt (516) is fitted onto the single timing pulley (513). Two sets of sliding rods (517) are fixedly installed inside the open cylinder (54) near the upper side. Sliding seats (518) are slidably installed on the two sets of sliding rods (517). Movable grooves (519) are opened on both sides of the sliding seats (518). Movable blocks (520) are movably installed inside the two sets of movable grooves (519). Rake teeth blocks (521) are fixedly installed on the upper side of the two sets of movable blocks (520). Two sets of second springs (522) are fixedly installed between the rake teeth blocks (521) and the sliding seats (518).

4. The combined support device for foundation pit slope according to claim 1, characterized in that: The locking rod (8) is adapted to the locking groove (7), and the cylinder (43) is inclined.

5. A combined support device for foundation pit slopes according to claim 2, characterized in that: The movable shaft (47) passes through the inner side of the arc opening (48) and is connected to the buffer plate (410). The lower side of the buffer plate (410) is movably connected to the guard plate (3).

6. A combined support device for foundation pit slopes according to claim 2, characterized in that: The opening cylinder (54) covers the position of the soil inlet (53), the opening cylinder (54) fits into the circular groove (52), and the two sets of positioning strips (56) are engaged and restricted in the gear ring (510).

7. A combined support device for foundation pit slopes according to claim 3, characterized in that: The reciprocating lead screw (514) passes laterally through the interior of the two open cylinders (54). Two mirror-symmetrical guide grooves are provided on the outer side of the reciprocating lead screw (514). The lower side of the slide block (518) is engaged in the guide groove of the reciprocating lead screw (514). The movable block (520) is adapted to the movable groove (519).

8. A combined support device for foundation pit slopes according to claim 3, characterized in that: The front and rear sides of the rake tooth block (521) are inclined. The rake tooth block (521) corresponds to the upper opening position of the opening cylinder (54). The rake tooth block (521) is pressed against the inner wall of the circular groove (52). The second spring (522) is in a compressed state.

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