An anti-deformation servo steel support system for deep foundation pit construction

Abstract

The present invention discloses a deformation-resistant servo steel support system for deep foundation pit construction, which relates to the technical field of deep foundation pit construction. The present invention includes a steel collar and a steel support assembly, and the steel support assembly is composed of two stress steel supports at both ends and several connecting steel supports in the middle; two groups of hydraulic jacks are fixedly installed at one end of the stress steel support away from the connecting steel support, and 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, and the adjusting shaft rod is inserted into a rectangular telescopic rod. Two groups of adjusting spiral grooves with opposite rotation directions are arranged on the outer surface of the adjusting shaft rod, and an adjusting head is arranged at one end of the adjusting shaft rod away from the connecting steel support. By controlling the operation of the hydraulic jacks, the stress steel supports at both ends can be adjusted synchronously and reversely, enabling the steel support assembly to be adjusted to a horizontal state more efficiently and accurately without the need to lift and adjust the steel support, and the adjustment efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of deep foundation pit construction, and specifically relates 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 factors such as the large excavation depth of the foundation pit, the disturbance of the surrounding soil mass, and the change of groundwater, it is easy to cause the settlement and inclination of the surrounding environment and buildings, and even serious safety accidents such as the collapse of the foundation pit may occur. During the construction of deep foundation pits, one of the most commonly used support systems is the steel support system. The steel support system reduces the deformation of the soil mass around the foundation pit and ensures the safety of the foundation pit and surrounding buildings by setting up horizontal or vertical steel support structures to transfer the lateral pressure of the foundation pit to the underground structure or support piles.

[0003] Currently, the installation steps of the steel support are as follows: (1) First, install steel corbels on the inner wall of the foundation pit, and then manually install steel girders on the steel corbels; (2) After the steel girders are installed, install steel brackets according to the center line of the steel support; (3) Use a crane to hoist the assembled steel support onto the steel brackets, and apply a support force to the inner wall of the foundation pit by controlling the hydraulic jack. Due to the height difference between the two ends of the steel brackets during actual installation, if this height difference is not eliminated, it will cause uneven stress at both ends of the steel support, easily resulting in sliding, causing uneven stress on the inner wall of the foundation pit and deformation. Therefore, after the steel support is hoisted, a level or laser level needs to be used to check the support structure to ensure that the verticality and levelness of the support system meet the design requirements, and local adjustments are made. If it is found that the support does not meet the design position, the steel support needs to be lifted, and then fine-tuning is carried out by adjusting the support position or adding gaskets, etc. Although this method can achieve horizontal adjustment, the adjustment time is long, manual cooperation is required for the hoisting of the steel support, and the adjustment efficiency is low, seriously affecting the construction efficiency of the foundation pit. In a Chinese patent (publication number: CN114411754B), a prestress compensation device for a foundation pit steel support is disclosed. This device adjusts the expansion joint through leveling bolts to keep the end plate vertical and prevent the jack from being eccentrically loaded. This adjustment method will cause the steel support to be angled during support, resulting in poor support stability, and the leveling bolts require a large driving force. At the same time, the steel support also needs to be lifted to perform the operation, with low efficiency. Summary of the Invention

[0004] The purpose of the present invention is: To solve the above problems, the present invention provides an anti-deformation servo steel support system for deep foundation pit construction.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] An anti-deformation servo steel support system for deep foundation pit construction, comprising a steel waling beam and a steel support assembly. The steel waling beam is fixedly installed with steel brackets at equal intervals, and the steel support assembly consists of two stress steel supports at both ends and several connecting steel supports in the middle;

[0007] One end of the stress steel support away from the connecting steel support is provided with a rectangular sliding groove, and a rectangular telescopic rod is slidably connected inside the rectangular sliding groove. Two groups of hydraulic jacks are fixedly installed at the end of the stress steel support away from the connecting steel support. The telescopic end of the hydraulic jack is fixedly installed with a telescopic plate. 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 arranged on the outer surface of the adjusting shaft rod. An adjusting head is arranged at the 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 sequentially from back to front;

[0008] Both the top and bottom of the rectangular telescopic rod are provided with a stop pin assembly, and the stop pin assembly can be inserted into the adjusting spiral groove.

[0009] Further, the stop pin assembly includes an outer sliding frame fixedly welded on the rectangular telescopic rod. A sliding nut is slidably connected inside the outer sliding frame. An adjusting screw rod is threadedly connected inside the sliding nut, and the sliding nut can be locked in the outer sliding frame. A guide hole is opened inside the rectangular telescopic rod, and the adjusting shaft rod is inserted into the guide hole. Adjusting holes are opened at both the top and bottom of the rectangular telescopic rod, and the length of the adjusting hole is the same as the length of the outer sliding frame. The adjusting screw rod can be inserted into the guide hole through the adjusting hole. The depths and widths of the two groups of adjusting spiral grooves are different.

[0010] Further, through holes are opened at both ends of the outer sliding frame, and limit nuts are welded on the outside of the through holes. Limit screw rods are threadedly connected inside the limit nuts.

[0011] Further, the upper surface and the lower surface of the adjusting head are symmetrically designed.

[0012] Further, a pin hole one is vertically penetrated and opened inside the stress steel support, and a pin hole two is vertically penetrated and opened inside the rectangular telescopic rod. A pin is inserted into both the pin hole one and the pin hole two at the same time.

[0013] Further, the stress steel support and the connecting steel support are connected by a flange.

[0014] Further, the steel bracket is designed in an L shape, and a reinforcing plate is arranged on the side, and the telescopic plate can be inserted between the reinforcing plates.

[0015] Further, an inclination sensor is fixedly installed at the top of the rectangular telescopic rod.

[0016] Further, a locking sleeve is welded to one end of the stress steel support away from the connecting steel support, and a locking groove is formed at the top of the rectangular telescopic rod.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By controlling the operation of the hydraulic jack, the hydraulic jack drives the telescopic plate to expand and contract, the telescopic plate drives the adjusting shaft rod to expand and contract, and 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 rod can be controlled, so that the adjusting shaft rod can rotate when expanding and contracting. The adjusting shaft rod drives the adjusting head to rotate. Since the distance from the lower surface of the adjusting head to the center of the adjusting shaft rod increases sequentially from the back to the front, the initial contact position between the adjusting head and the steel bracket is in the middle. By reversing the adjusting head, the distance between the center of the stress steel support and the steel bracket can be controlled, and the stress steel supports at both ends can be adjusted synchronously and reversely, so that the steel support assembly can be adjusted to the horizontal more efficiently and accurately without hoisting and adjusting the steel support, and the adjustment efficiency is high.

[0019] 2. Through the setting of 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 simultaneously inserted into the two groups of adjusting spiral grooves, the adjusting shaft rod can be locked. At this time, the adjusting shaft rod and the rectangular telescopic rod form a flexible head, which can stably apply a supporting force, and the structure is compact. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the servo steel support system of the present invention;

[0021] Figure 2 is a schematic installation diagram of the steel support of the present invention;

[0022] Figure 3 is an exploded view of the stress steel support of the present invention;

[0023] Figure 4 is a schematic cross-sectional structure diagram of the rectangular telescopic rod of the present invention;

[0024] Figure 5 is a three-dimensional structural diagram of the adjusting shaft rod of the present invention;

[0025] Figure 6 is a right-view structural diagram of the adjusting shaft rod of the present invention;

[0026] Figure 7 is a locking schematic diagram of the adjusting shaft rod of the present invention.

[0027] Reference numerals: 1, steel collar; 2, steel bracket; 3, stress steel support; 31, rectangular chute; 32, pin hole 1; 33, plug pin; 34, hydraulic jack; 35, locking sleeve; 4, connecting steel support; 5, rectangular telescopic rod; 51, guide hole; 52, adjustment hole; 53, pin hole 2; 54, locking groove; 55, inclination sensor; 6, adjustment shaft rod; 61, adjustment spiral groove; 62, adjustment head; 7, outer sliding frame; 71, sliding nut; 72, adjustment screw; 73, limit screw; 8, telescopic plate. Detailed implementation mode

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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.

[0029] Embodiment 1, as Figures 1-7 shown, a servo steel support system for resisting deformation in deep foundation pit construction includes a steel collar 1 and a steel support assembly. Steel brackets 2 are fixedly installed at equal intervals on the steel collar 1. The steel support assembly is composed of two stress steel supports 3 at both ends and several connecting steel supports 4 in the middle;

[0030] One end of the stress steel support 3 far from the connecting steel support 4 is provided with a rectangular chute 31. A rectangular telescopic rod 5 is slidably connected inside the rectangular chute 31. Two groups of hydraulic jacks 34 are fixedly installed at one end of the stress steel support 3 far from the connecting steel support 4. The telescopic end of the hydraulic jack 34 is fixedly installed with a telescopic plate 8. An adjustment shaft rod 6 is rotatably installed inside the telescopic plate 8. The adjustment shaft rod 6 is inserted into the rectangular telescopic rod 5. Two groups of adjustment spiral grooves 61 with opposite helix directions are provided on the outer surface of the adjustment shaft rod 6. One end of the adjustment shaft rod 6 far from the connecting steel support 4 is provided with an adjustment head 62. The distance from the lower surface of the adjustment head 62 to the center of the adjustment shaft rod 6 increases sequentially from back to front;

[0031] Blocking pin assemblies are provided at both the top and bottom of the rectangular telescopic rod 5, and the blocking pin assemblies can be inserted into the adjustment spiral grooves 61.

[0032] Pre-installation: First, install steel corbels on the inner wall of the foundation pit, and then manually install the steel collar 1 on the steel corbels. After the steel collar 1 is installed, install the steel brackets 2 according to the center line of the steel support. Use a crane to hoist the assembled steel support assembly onto the steel brackets 2, and press the middle position of the lower surface of the adjustment head 62 on the steel brackets 2.

[0033] Horizontal adjustment: After hoisting is completed, use a spirit level or a laser level to check the support structure to determine whether both ends of the steel support assembly are horizontal. When the left end of the steel support assembly is lower and the right end is higher, insert the retaining pin assembly above the left end into the corresponding adjustment spiral groove 61, and insert the retaining pin assembly below the right end into the corresponding adjustment spiral groove 61. Then control the operation of the hydraulic jack 34. The hydraulic jack 34 drives the telescopic plate 8 away from the connecting steel support 4, and the telescopic plate 8 drives the adjustment shaft rod 6 away from the connecting steel support 4. It should be noted that at this time, the rectangular telescopic rod 5 is locked, and the adjustment shaft rod 6 rotates under the action of the adjustment spiral groove 61. The adjustment shaft rod 6 drives the adjustment head 62 to rotate. At this time, the adjustment head 62 at the left end rotates clockwise, and the adjustment head 62 at the left end lifts the left end of the steel support assembly upward. At the same time, the adjustment head 62 at the right end rotates counterclockwise, and the adjustment head 62 at the right end lowers the right end of the steel support assembly. Therefore, the leveling of the steel support assembly can be automatically and quickly completed, and the adjustment efficiency is high. When the left end of the steel support assembly is higher and the right end is lower, insert the retaining pin assembly below the left end into the corresponding adjustment spiral groove 61, and insert the retaining pin assembly above the right end into the corresponding adjustment spiral groove 61.

[0034] Applying support force: After horizontal adjustment is completed, insert the upper and lower retaining pin assemblies into the two groups of adjustment spiral grooves 61 at the same time. At this time, the retaining pin assembly restricts the rotation and telescoping of the adjustment shaft rod 6 relative to the rectangular telescopic rod 5. Unlock the rectangular telescopic rod 5, control the hydraulic jack 34 to continue operating. The hydraulic jack 34 drives the rectangular telescopic rod 5 to extend through the telescopic plate 8 and the adjustment shaft rod 6. The adjustment head 62 slides relative to the steel bracket 2, and the adjustment head 62 presses tightly on the steel bracket 2. When the support force reaches the required value, the hydraulic jack 34 stops operating, and then lock the rectangular telescopic rod 5 again.

[0035] The structure of the present invention is arranged such that there is no need to hoist and level the steel support assembly, and no additional drive is required for leveling. The structure is compact and the leveling efficiency is high.

[0036] Embodiment 2, on the basis of the above embodiment, further includes that the retaining pin assembly includes an outer sliding frame 7 fixedly welded to the rectangular telescopic rod 5. A sliding nut 71 is slidably connected inside the outer sliding frame 7. An adjustment screw rod 72 is threadedly connected inside the sliding nut 71. The sliding nut 71 can be locked in the outer sliding frame 7. A guide hole 51 is opened inside the rectangular telescopic rod 5. The adjustment shaft rod 6 is inserted into the guide hole 51. Adjustment holes 52 are opened at the top and bottom of the rectangular telescopic rod 5. The length of the adjustment hole 52 is the same as the length of the outer sliding frame 7. The adjustment screw rod 72 can be inserted into the guide hole 51 through the adjustment hole 52. The depths and widths of the two groups of adjustment spiral grooves 61 are different.

[0037] Furthermore, through holes are opened at both ends of the outer sliding frame 7, and limit nuts are welded on the outside of the through holes. Limit screw rods 73 are threadedly connected inside the limit nuts.

[0038] During leveling, by rotating the limit screws 73 at both ends, the sliding nut 71 is clamped and fixed in the outer sliding frame 7. At this time, the adjusting screw 72 can be screwed into the corresponding adjusting spiral groove 61.

[0039] When applying the supporting force, if the upper adjusting screw 72 participates in the horizontal adjustment, at this time, observe the position of the lower adjusting spiral groove 61 through the lower adjusting hole 52, and then slide the lower sliding nut 71 so that the lower adjusting screw 72 can be inserted into the corresponding adjusting spiral groove 61. Then, screw the lower adjusting screw 72 into the corresponding adjusting spiral groove 61. At this time, the adjusting shaft rod 6 is locked in the rectangular telescopic rod 5. Then, rotate the limit screws 73 at both ends to lock the lower sliding nut 71 in the lower outer sliding frame 7, which is convenient for locking.

[0040] It should be noted that the maximum adjustment angle of the adjusting head 62 is 90 degrees. Therefore, a relatively short extension distance of the adjusting shaft rod 6 can achieve horizontal adjustment, and the outer sliding frame 7 does not need to be set to a long length, so that the lower adjusting screw 72 can find the corresponding adjusting spiral groove 61, and the adjustment space is small.

[0041] Embodiment Three, on the basis of 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 hoisting position, and it is only necessary to press the middle part of the outer surface of the adjusting head 62 on the steel bracket 2.

[0042] Embodiment Four, on the basis of the above embodiment, further includes that a first pin hole 32 is vertically and penetratingly opened inside the stress steel support 3, and a second pin hole 53 is vertically and penetratingly opened inside the rectangular telescopic rod 5. A pin 33 is inserted into both the first pin hole 32 and the second pin hole 53 at the same time.

[0043] By inserting the pin 33 into both the first pin hole 32 and the second pin hole 53 at the same time, the rectangular telescopic rod 5 can be locked on the stress steel support 3. When applying stress, pull out the pin 33.

[0044] Embodiment Five, on the basis of the above embodiment, further includes that the stress steel support 3 and the connecting steel support 4 are connected by a flange, which is convenient for connection.

[0045] Furthermore, the steel bracket 2 is designed in an L shape, and a reinforcing plate is provided on the side. The telescopic plate 8 can be inserted between the reinforcing plates. Through this design, the steel bracket 2 can provide sufficient adjustment length and sufficient strength.

[0046] Embodiment Six, on the basis of the above embodiment, further includes that an inclination sensor 55 is fixedly installed at the top of the rectangular telescopic rod 5. Through the setting of the inclination sensor 55, the inclination angle of the steel support assembly can be automatically detected, and the adjustment is more convenient.

[0047] Embodiment 7. On the basis of the above embodiments, it further includes 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.

[0048] After the support force is applied, the locking sleeve 35 displaces relative to the locking groove 54. At this time, a telescopic space is formed between the side of the locking groove 54 close to the connecting steel support 4 and the side of the locking sleeve 35 away from the connecting steel support 4. Steel pads are inserted into the telescopic space and welded firmly. The hydraulic jack 34 can be depressurized. This method is a conventional fixing method, which requires the steel pads to be removed first during disassembly. However, through the setting of the adjusting shaft rod 6 in the present invention, during disassembly, only the upper and lower adjusting screws 72 need to be screwed out of the adjusting spiral groove 61. The adjusting shaft rod 6 can retract into the rectangular telescopic rod 5. Therefore, the steel support can be disassembled quickly, and the steel pads can be centrally processed later, with high disassembly efficiency.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can 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 these 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). The adjusting shaft rod (6) is inserted into the rectangular telescopic rod (5), and 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 provided with stop pin assemblies, and the stop pin assemblies can be inserted into the adjusting spiral grooves (61); The stop pin assembly comprises an outer sliding frame (7) fixedly welded on the rectangular telescopic rod (5); a sliding nut (71) is slidably connected to the inside of the outer sliding frame (7); an adjusting screw (72) is threadedly connected to the inside of the sliding nut (71); 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); and adjustment holes are provided at the top and bottom of the rectangular telescopic rod (5). (52), the length of the adjustment hole (52) is the same as the length of the outer sliding frame (7), the adjustment screw (72) can be inserted into the guide hole (51) through the adjustment hole (52), the depth and width of the two sets of adjustment spiral grooves (61) are different, the stress steel support (3) is vertically penetrated by a pin hole 1 (32), the rectangular telescopic rod (5) is vertically penetrated by a pin hole 2 (53), and the pin holes 1 (32) and 2 (53) are both plugged with pins (33).

2. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 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).

3. The anti-deformation servo steel support system for deep foundation pit construction according to claim 2 is characterized in that: The upper surface and the lower surface of the regulating head (62) are symmetrically designed.

4. 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.

5. 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.

6. 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).

7. The anti-deformation servo steel support system for deep foundation pit construction according to claim 1 is 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).

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