Anti-deformation servo steel supporting system for deep foundation pit construction

Abstract

The invention discloses an anti-deformation servo steel supporting system for deep foundation pit construction, and relates to the technical field of deep foundation pit construction. The device comprises a steel enclosing purlin and a steel supporting assembly, wherein the steel supporting assembly is composed of stress steel supports at the two ends and a plurality of connecting steel supports in the middle; two sets of hydraulic jacks are fixedly installed at the end, away from the connecting steel support, of the stress steel support, telescopic plates are fixedly installed at the telescopic ends of the hydraulic jacks, adjusting shaft rods are rotatably installed in the telescopic plates and inserted into the rectangular telescopic rods, and two sets of adjusting spiral grooves with opposite rotating directions are formed in the outer surfaces of the adjusting shaft rods; an adjusting head is arranged at the end, away from the connecting steel support, of the adjusting shaft rod. The hydraulic jacks are controlled to operate, so that the stress steel supports at the two ends can be synchronously and reversely adjusted, the steel support assembly can be adjusted to be horizontal more efficiently and accurately, hoisting adjustment on the steel supports is not needed, and the adjusting efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of deep foundation pit construction, and in particular to an anti-deformation servo steel support system for deep foundation pit construction. Background Art

[0002] During the construction of deep foundation pits, due to the large excavation depth of the foundation pit, the disturbance of the surrounding soil and the change of groundwater, it is easy to cause the settlement and tilt of the surrounding environment and buildings, and even serious safety accidents such as foundation pit collapse. During the construction of deep foundation pits, one of the most commonly used support systems is the steel support system. The steel support system transmits the outer pressure of the foundation pit to the underground structure or support piles by setting up horizontal or vertical steel support structures, reducing the deformation of the soil around the foundation pit and ensuring the safety of the foundation pit and surrounding buildings.

[0003] At present, the installation steps of steel supports are as follows: (1) first install steel brackets on the inner wall of the foundation pit, and then manually install steel purlins on the steel brackets; (2) after the steel purlins are installed, install steel brackets according to the center line of the steel supports; (3) use a crane to hoist the spliced ​​steel supports onto the steel brackets, and apply support force to the inner wall of the foundation pit by controlling the hydraulic jack. Since there is a height difference between the steel brackets at both ends during the actual installation process, if the height difference is not eliminated, the forces at both ends of the steel supports will be uneven, which will easily cause sliding, resulting in uneven forces on the inner wall of the foundation pit and deformation. Therefore, after the steel supports are hoisted, it is necessary to use a level or laser level to check the support structure to ensure that the verticality and horizontality of the support system meet the design requirements, and make local adjustments. If it is found that the support does not meet the design position, it is necessary to lift the steel support, and then adjust the support position or add gaskets for fine-tuning. Although this method can achieve horizontal adjustment, the adjustment time is long, and manual cooperation is required to lift the steel support. The adjustment efficiency is low, which seriously affects the efficiency of foundation pit construction. In a Chinese patent (publication number: CN114411754B), a prestressed compensating device for foundation pit steel supports is disclosed. The device adjusts the expansion joints by leveling bolts to keep the end plates vertical and prevent the jack from being overloaded. This adjustment method will cause the steel supports to tilt at an angle during support, resulting in poor support stability. The leveling bolts require a large driving force, and the steel supports also need to be lifted for operation, which is inefficient. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide an anti-deformation servo steel support system for deep foundation pit construction.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A deformation-resistant servo steel support system for deep foundation pit construction, comprising a steel purlin and a steel support assembly, wherein steel brackets are fixedly installed on the steel purlin at equal intervals, and the steel support assembly is composed of stress steel supports at both ends and a plurality of connecting steel supports in the middle; A rectangular slide groove is provided at one end of the stress steel support away from the connecting steel support, a rectangular telescopic rod is slidably connected inside the rectangular slide groove, two groups of hydraulic jacks are fixedly installed at one end of the stress steel support away from the connecting steel support, a telescopic plate is fixedly installed at the telescopic end of the hydraulic jack, an adjusting shaft rod is rotatably installed inside the telescopic plate, the adjusting shaft rod is inserted into the rectangular telescopic rod, two groups of adjusting spiral grooves with opposite rotation directions are provided on the outer surface of the adjusting shaft rod, an adjusting head is provided at one end of the adjusting shaft rod away from the connecting steel support, and the distance from the lower surface of the adjusting head to the center of the adjusting shaft rod increases from the back to the front; The top and the bottom of the rectangular telescopic rod are both provided with stop pin assemblies, and the stop pin assemblies can be inserted into the adjusting spiral groove.

[0006] Furthermore, the stop pin assembly includes an outer sliding frame fixedly welded on a rectangular telescopic rod, the outer sliding frame is internally slidably connected to a sliding nut, the sliding nut is internally threadedly connected to an adjusting screw, the sliding nut can be locked in the outer sliding frame, a guide hole is provided inside the rectangular telescopic rod, the adjusting shaft rod is inserted into the guide hole, the top and bottom of the rectangular telescopic rod are both provided with adjustment holes, the length of the adjustment hole is the same as the length of the outer sliding frame, the adjusting screw can be inserted into the guide hole through the adjustment hole, and the depth and width of the two sets of adjusting spiral grooves are different.

[0007] Furthermore, through holes are provided at both ends of the outer sliding frame, and limit nuts are welded on the outer sides of the through holes, and the internal threads of the limit nuts are connected to the limit screws.

[0008] Furthermore, the upper surface and the lower surface of the regulating head are symmetrically designed.

[0009] Furthermore, a pin hole 1 is vertically penetrated inside the stress steel support, and a pin hole 2 is vertically penetrated inside the rectangular telescopic rod. Pins are inserted into the insides of both the pin hole 1 and the pin hole 2.

[0010] Furthermore, the stress steel support and the connecting steel support are connected via a flange.

[0011] Furthermore, the steel bracket is designed to be L-shaped, and reinforcement plates are provided on the sides, and the telescopic plate can be inserted between the reinforcement plates.

[0012] Furthermore, a tilt sensor is fixedly mounted on the top of the rectangular telescopic rod.

[0013] Furthermore, a locking sleeve is welded to one end of the stress steel support away from the connecting steel support, and a locking groove is provided at the top of the rectangular telescopic rod.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention controls the operation of the hydraulic jack, the hydraulic jack drives the telescopic plate to extend and retract, the telescopic plate drives the adjusting shaft to extend and retract, and then through the setting of two groups of stop pin assemblies and two groups of adjusting spiral grooves with opposite rotation directions, the rotation direction of the adjusting shaft can be controlled, so that the adjusting shaft can rotate when extending and retracting, and the adjusting shaft drives the adjusting head to rotate. Since the distance from the lower surface of the adjusting head to the center of the adjusting shaft increases from back to front, the initial contact position of the adjusting head and the steel bracket is located in the middle. The spacing between the center of the stress steel support and the steel bracket can be controlled by the forward and reverse rotation of the adjusting head, and the stress steel supports at both ends can be adjusted in opposite directions synchronously, so that the steel support assembly can be adjusted to the horizontal more efficiently and accurately, without the need to lift and adjust the steel support, and the adjustment efficiency is high.

[0015] 2. The present invention arranges two groups of stop pin assemblies and two groups of adjusting spiral grooves with opposite rotation directions. When the two groups of stop pin assemblies are inserted into the two groups of adjusting spiral grooves at the same time, the adjusting shaft rod can be locked. At this time, the adjusting shaft rod and the rectangular telescopic rod form an active head, which can stably apply supporting force and has a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the servo steel support system of the present invention; Figure 2 It is a schematic diagram of the installation of the steel support of the present invention; Figure 3 It is an exploded view of the stress steel support of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of a rectangular telescopic rod of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the adjusting shaft rod of the present invention; Figure 6 It is a right view structural schematic diagram of the adjusting shaft rod of the present invention; Figure 7 It is a schematic diagram of locking the adjusting shaft rod of the present invention.

[0017] Figure numerals: 1. Steel purlin; 2. Steel bracket; 3. Stress steel support; 31. Rectangular slide groove; 32. Pin hole one; 33. Latch; 34. Hydraulic jack; 35. Locking sleeve; 4. Connecting steel support; 5. Rectangular telescopic rod; 51. Guide hole; 52. Adjustment hole; 53. Pin hole two; 54. Locking groove; 55. Inclination sensor; 6. Adjustment shaft; 61. Adjustment spiral groove; 62. Adjustment head; 7. Outer slide frame; 71. Sliding nut; 72. Adjustment screw; 73. Limit screw; 8. Telescopic plate. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Embodiment 1, as Figure 1-Figure 7 As shown, a deformation-resistant servo steel support system for deep foundation pit construction includes a steel purlin 1 and a steel support assembly. Steel brackets 2 are fixedly installed on the steel purlin 1 at equal intervals. The steel support assembly consists of stress steel supports 3 at both ends and a plurality of connecting steel supports 4 in the middle. A rectangular slide groove 31 is provided at one end of the stress steel support 3 away from the connecting steel support 4, and a rectangular telescopic rod 5 is slidably connected inside the rectangular slide groove 31. Two groups of hydraulic jacks 34 are fixedly installed at one end of the stress steel support 3 away from the connecting steel support 4. A telescopic plate 8 is fixedly installed at the telescopic end of the hydraulic jack 34. An adjusting shaft rod 6 is rotatably installed inside the telescopic plate 8. The adjusting shaft rod 6 is inserted into the rectangular telescopic rod 5. Two groups of adjusting spiral grooves 61 with opposite rotation directions are provided on the outer surface of the adjusting shaft rod 6. An adjusting head 62 is provided at one end of the adjusting shaft rod 6 away from the connecting steel support 4. The distance from the lower surface of the adjusting head 62 to the center of the adjusting shaft rod 6 increases from the back to the front. The top and bottom of the rectangular telescopic rod 5 are both provided with stop pin assemblies, and the stop pin assemblies can be inserted into the adjusting spiral groove 61.

[0020] Pre-installation: first install the steel corbel on the inner wall of the foundation pit, and then manually install the steel purlin 1 on the steel corbel. After the steel purlin 1 is installed, install the steel bracket 2 according to the center line of the steel support. Use a crane to lift the spliced ​​steel support assembly onto the steel bracket 2, and make the middle position of the lower surface of the adjusting head 62 press on the steel bracket 2.

[0021] Horizontal adjustment: After the lifting is completed, use a spirit level or a laser level to check the supporting structure to determine whether the two ends of the steel support assembly are horizontal. When the left end of the steel support assembly is lower than the right end, insert the stop pin assembly above the left end into the corresponding adjusting spiral groove 61, and insert the stop pin assembly below the right end into the corresponding adjusting spiral groove 61. Then control the hydraulic jack 34 to operate. The hydraulic jack 34 drives the telescopic plate 8 away from the connected steel support 4, and the telescopic plate 8 drives the adjusting shaft rod 6 away from the connected steel support 4. It should be noted that the rectangular telescopic rod 5 is locked at this time, and the adjusting shaft rod 6 is locked. The joint shaft rod 6 rotates under the action of the adjusting spiral groove 61, and the adjusting shaft rod 6 drives the adjusting head 62 to rotate. At this time, the adjusting head 62 at the left end rotates forward, and the left adjusting head 62 lifts the left end of the steel support assembly upward. At the same time, the adjusting head 62 at the right end rotates backward, and the right adjusting head 62 lowers the right end of the steel support assembly. Therefore, the leveling of the steel support assembly can be completed automatically and quickly, and the adjustment efficiency is high. When the left end of the steel support assembly is higher than the right end, the stop pin assembly below the left end is inserted into the corresponding adjusting spiral groove 61, and the stop pin assembly above the right end is inserted into the corresponding adjusting spiral groove 61.

[0022] Apply supporting force: After the horizontal adjustment is completed, the upper and lower stop pin assemblies are simultaneously inserted into the two sets of adjusting spiral grooves 61. At this time, the stop pin assemblies limit the rotation and extension of the adjusting shaft 6 relative to the rectangular telescopic rod 5, unlock the rectangular telescopic rod 5, and control the hydraulic jack 34 to continue running. The hydraulic jack 34 drives the rectangular telescopic rod 5 to extend through the telescopic plate 8 and the adjusting shaft 6, and the adjusting head 62 slides relative to the steel bracket 2, and the adjusting head 62 is pressed tightly against the steel bracket 2. When the supporting force reaches the requirement, the hydraulic jack 34 stops running, and then the rectangular telescopic rod 5 can be locked again.

[0023] The structure of the present invention does not need to be lifted and leveled for the steel support assembly, and no additional drive is required for leveling. The structure is compact and the leveling efficiency is high.

[0024] Embodiment 2, on the basis of the above embodiment, further includes, the stop pin assembly includes an outer sliding frame 7 fixedly welded on the rectangular telescopic rod 5, the inner sliding connection of the outer sliding frame 7 is provided with a sliding nut 71, the inner thread connection of the sliding nut 71 is provided with an adjusting screw 72, the sliding nut 71 can be locked in the outer sliding frame 7, a guide hole 51 is provided inside the rectangular telescopic rod 5, the adjusting shaft rod 6 is inserted in the guide hole 51, the top and bottom of the rectangular telescopic rod 5 are provided with adjusting holes 52, the length of the adjusting hole 52 is the same as the length of the outer sliding frame 7, the adjusting screw 72 can be inserted into the guide hole 51 through the adjusting hole 52, and the depth and width of the two sets of adjusting spiral grooves 61 are different.

[0025] Furthermore, through holes are provided at both ends of the outer sliding frame 7 , and limit nuts are welded on the outer sides of the through holes, and the internal threads of the limit nuts are connected to the limit screws 73 .

[0026] When leveling, the sliding nut 71 is clamped and fixed in the outer sliding frame 7 by rotating the limit screws 73 at both ends, and the adjusting screw 72 is screwed into the corresponding adjusting spiral groove 61 at this time.

[0027] When the supporting force is applied, if the upper adjusting screw 72 is involved in the horizontal adjustment, the position of the lower adjusting spiral groove 61 is observed through the lower adjusting hole 52, and then the lower sliding nut 71 is slid so that the lower adjusting screw 72 can be inserted into the corresponding adjusting spiral groove 61, and then the lower adjusting screw 72 is screwed into the corresponding adjusting spiral groove 61. At this time, the adjusting shaft 6 is locked in the rectangular telescopic rod 5, and then the limit screws 73 at both ends are rotated to lock the lower sliding nut 71 in the lower outer sliding frame 7, which is easy to lock.

[0028] It should be noted that the maximum adjustment angle of the adjustment head 62 is 90 degrees, so the adjustment shaft rod 6 can achieve horizontal adjustment by extending a short distance, and the outer sliding frame 7 does not need to be set to a longer length, so that the adjusting screw 72 below can find the corresponding adjusting spiral groove 61, and the adjustment space is small.

[0029] Embodiment 3, based on the above embodiment, further includes that the upper surface and the lower surface of the adjusting head 62 are symmetrically designed. Through this design, it is more convenient to find the lifting position, so that the middle part of the outer surface of the adjusting head 62 is pressed on the steel bracket 2.

[0030] Embodiment 4, based on the above embodiment, further includes: a pin hole 1 32 is vertically penetrated inside the stress steel support 3, a pin hole 2 53 is vertically penetrated inside the rectangular telescopic rod 5, and pins 33 are inserted into the insides of both the pin hole 1 32 and the pin hole 2 53.

[0031] By inserting the pin 33 into the pin hole 1 32 and the pin hole 2 53 at the same time, the rectangular telescopic rod 5 can be locked on the stress steel support 3. When stress is applied, the pin 33 can be pulled out.

[0032] Embodiment 5, based on the above embodiment, further includes that the stress steel support 3 and the connection steel support 4 are connected by a flange, which is convenient for connection.

[0033] Furthermore, the steel bracket 2 is designed to be L-shaped, and reinforcement plates are provided on the sides, and the telescopic plate 8 can be inserted between the reinforcement plates. Through this design, the steel bracket 2 can provide sufficient adjustment length and have sufficient strength.

[0034] Embodiment 6, based on the above embodiment, further includes that a tilt sensor 55 is fixedly installed on the top of the rectangular telescopic rod 5. Through the setting of the tilt sensor 55, the tilt angle of the steel support assembly can be automatically detected, and the adjustment is more convenient.

[0035] Embodiment 7, based on the above embodiment, further includes: a locking sleeve 35 is welded to one end of the stress steel support 3 away from the connecting steel support 4 , and a locking groove 54 is opened at the top of the rectangular telescopic rod 5 .

[0036] After the supporting force is applied, the locking sleeve 35 is displaced relative to the locking groove 54. At this time, a telescopic space is formed between the locking groove 54 close to the connected steel support 4 and the locking sleeve 35 away from the connected steel support 4. A steel pad is inserted into the telescopic space and welded firmly. The hydraulic jack 34 can relieve pressure. This method is a conventional fixing method, which requires the steel pad to be removed first during disassembly. However, the present invention adjusts the shaft rod 6 so that when disassembling, only the upper and lower adjusting screws 72 need to be unscrewed out of the adjusting spiral groove 61. The adjusting shaft rod 6 can be retracted into the rectangular telescopic rod 5. Therefore, the steel support can be disassembled quickly, and the steel pad can be subsequently processed centrally, with high disassembly efficiency.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A deformation-resistant servo steel support system for deep foundation pit construction, comprising a steel purlin (1) and a steel support assembly, characterized in that: Steel brackets (2) are fixedly installed at equal intervals on the steel purlin (1), and the steel support assembly is composed of stress steel supports (3) at both ends and a plurality of connecting steel supports (4) in the middle; The stress steel support (3) is provided with a rectangular slide groove (31) at one end away from the connecting steel support (4), and a rectangular telescopic rod (5) is slidably connected inside the rectangular slide groove (31). Two groups of hydraulic jacks (34) are fixedly installed at one end of the stress steel support (3) away from the connecting steel support (4), and a telescopic plate (8) is fixedly installed at the telescopic end of the hydraulic jack (34). An adjusting shaft rod (6) is rotatably installed inside the telescopic plate (8), and the adjusting shaft rod (6) is inserted into the rectangular telescopic rod (5). Two groups of adjusting spiral grooves (61) with opposite rotation directions are provided on the outer surface of the adjusting shaft rod (6). An adjusting head (62) is provided at one end of the adjusting shaft rod (6) away from the connecting steel support (4), and the distance from the lower surface of the adjusting head (62) to the center of the adjusting shaft rod (6) increases from the back to the front. The top and bottom of the rectangular telescopic rod (5) are both provided with stop pin assemblies, and the stop pin assemblies can be inserted into the adjusting spiral groove (61).

2. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 is characterized in that: The stop pin assembly comprises an outer sliding frame (7) fixedly welded on a rectangular telescopic rod (5); the outer sliding frame (7) is internally slidably connected to a sliding nut (71); the sliding nut (71) is internally threadedly connected to an adjusting screw (72); the sliding nut (71) can be locked in the outer sliding frame (7); a guide hole (51) is provided inside the rectangular telescopic rod (5); an adjusting shaft rod (6) is inserted into the guide hole (51); the top and bottom of the rectangular telescopic rod (5) are both provided with adjusting holes (52); the length of the adjusting hole (52) is the same as that of the outer sliding frame (7); the adjusting screw (72) can be inserted into the guide hole (51) through the adjusting hole (52); and the depth and width of the two sets of adjusting spiral grooves (61) are different.

3. The anti-deformation servo steel support system for deep foundation pit construction according to claim 2 is characterized in that: Through holes are provided at both ends of the outer sliding frame (7), and limit nuts are welded on the outsides of the through holes. The internal threads of the limit nuts are connected to the limit screw rods (73).

4. The anti-deformation servo steel support system for deep foundation pit construction according to claim 3 is characterized in that: The upper surface and the lower surface of the regulating head (62) are symmetrically designed.

5. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 is characterized in that: A first pin hole (32) is vertically penetrated inside the stress steel support (3), and a second pin hole (53) is vertically penetrated inside the rectangular telescopic rod (5). Pins (33) are inserted into the first pin hole (32) and the second pin hole (53) at the same time.

6. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 is characterized in that: The stress steel support (3) and the connecting steel support (4) are connected via a flange.

7. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 is characterized in that: The steel bracket (2) is designed to be L-shaped, and reinforcement plates are provided on the sides, and the telescopic plate (8) can be inserted between the reinforcement plates.

8. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 is characterized in that: A tilt sensor (55) is fixedly mounted on the top of the rectangular telescopic rod (5).

9. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1, characterized in that: A locking sleeve (35) is welded to one end of the stress steel support (3) away from the connecting steel support (4), and a locking groove (54) is formed at the top of the rectangular telescopic rod (5).

Images