A foundation pit retaining system

Abstract

The utility model discloses a kind of foundation pit enclosure system, including steel sheet pile, steel support, enclosure purlin and corbel, steel sheet pile is installed in foundation pit around, corbel is fixedly connected on the inner wall of steel sheet pile, enclosure purlin is placed on the upside of corbel transversely, steel support includes steel support main body, push plate and drive assembly, drive assembly includes screw rod, screw sleeve, support sleeve, transmission shaft, worm and worm wheel, one end of screw rod away from steel support main body is rotatably connected with push plate, push plate and enclosure purlin inside side abut, transmission groove is coaxially provided on the other end of screw rod, one end of transmission shaft is slidably connected in transmission groove, the other end of transmission shaft is fixedly connected with worm wheel, worm is rotatably connected in support sleeve, and is matched with worm wheel, worm upper end protrudes on the upside of support sleeve, to connect external driver. The utility model proposes a kind of foundation pit enclosure system, screw rod is self-locked after exerting thrust to steel sheet pile, does not need external driver sustained driving force, there is no risk of oil leakage, and also can save operating space in foundation pit.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction technology, and in particular to a foundation pit retaining system. Background Technology

[0002] When constructing bridge abutments during foundation pit excavation, it is necessary to build a foundation pit retaining wall around the pit to prevent collapse and ensure construction safety. Existing foundation pit retaining walls include steel sheet piles arranged around the edge of the foundation pit and steel supports supporting the inner side of the steel sheet piles. During construction, steel sheet piles are first driven into the ground, and then steel supports are erected as excavation progresses. After the bridge abutment is poured in the foundation pit, the steel supports are removed. Existing steel supports, as shown in patent application number CN202310515949.4, include steel supports and jacks installed at the ends of the steel supports. When installing the steel supports, the steel supports are hoisted to the installation position, and high-pressure oil is introduced into the jacks. The jacks extend to apply thrust to the steel sheet piles. To maintain the thrust, the oil lines connected to the jacks need to be kept in place. There is a possibility of oil leakage in the oil lines, and the oil lines also affect the operating space in the foundation pit. Utility Model Content

[0003] To address the shortcomings of existing steel supports that require maintaining oil lines to retain thrust, this invention proposes a foundation pit support system. The screw applies thrust to the steel sheet pile and then self-locks, eliminating the need for continuous external drive force, thus avoiding the risk of oil leakage and saving operating space within the foundation pit.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A foundation pit retaining system includes steel sheet piles, steel supports, walers, and corbels. The steel sheet piles are installed around the foundation pit, and the corbels are fixedly connected to the inner walls of the steel sheet piles. The walers are placed laterally on the upper side of the corbels. The steel supports include a main body, a push plate, and a drive assembly. The drive assembly includes a screw, a screw sleeve, a support sleeve, a drive shaft, a worm gear, and a worm wheel. The support sleeve abuts against the upper side of the corbel. The screw sleeve is coaxially fixedly connected to the end of the main body of the steel support through the support sleeve. The screw passes through the screw sleeve and is threadedly connected to the screw sleeve. The end of the screw away from the main body of the steel support is rotatably connected to the push plate. The push plate abuts against the inner side of the walers. The other end of the screw is coaxially provided with a transmission groove. One end of the drive shaft is slidably connected in the transmission groove, and the other end of the drive shaft is fixedly connected to the worm wheel. The worm gear is rotatably connected in the support sleeve and cooperates with the worm wheel. The upper end of the worm gear protrudes from the upper side of the support sleeve to connect to an external drive unit.

[0006] With the above setup, the external drive provides driving force to the drive assembly. The drive assembly can self-lock after applying thrust to the sheet pile through the push plate. The external drive can be removed to save operating space in the pit and eliminates the risk of oil leakage. The removed external drive can be used for the installation of other steel supports. That is, multiple steel supports share one set of external drives to simplify on-site equipment and facilitate equipment management.

[0007] Furthermore, the steel support also includes a self-locking assembly, which includes a guide sleeve, a guide rod, and a locking sleeve. The guide sleeve is arranged parallel to the side of the threaded sleeve and is fixedly connected to the main body of the steel support. The end of the guide sleeve away from the main body of the steel support has a conical surface along its inner circumference. One end of the guide rod is slidably connected in the guide sleeve, and the other end of the guide rod is fixedly connected to the push plate. The locking sleeve includes a support ring and a wedge. The support ring is slidably sleeved on the guide rod. Multiple wedges are fixedly connected circumferentially on the side of the support ring near the guide sleeve. The outer side of the wedge is in contact with the conical surface, and the inner side of the wedge clamps the guide rod.

[0008] The above settings improve the stability of the steel support.

[0009] Furthermore, the self-locking assembly also includes a spring, which is sleeved on the guide rod. One end of the spring is fixedly connected to the push plate, and the other end of the spring is fixedly connected to the lock sleeve.

[0010] With the above settings, the self-locking component can achieve the self-locking function.

[0011] Furthermore, there are two self-locking components, symmetrically arranged on opposite sides of the drive component.

[0012] The above settings further enhance the stability of the steel support.

[0013] Furthermore, the guide sleeve abuts against the upper side of the corbel.

[0014] The above-mentioned design prevents the steel support end from rotating on the corbel.

[0015] Furthermore, the cross-section of the transmission groove is square, and the cross-section of the transmission shaft is adapted to the cross-section of the transmission groove. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the enclosure system for an embodiment.

[0017] Figure 2 This is a schematic diagram of the steel support end in an embodiment.

[0018] Figure 3 This is a cross-sectional view of the steel support end in an embodiment. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0020] like Figures 1 to 3A foundation pit retaining system includes sheet piles 3, steel supports, walers 9, and corbels 4. The sheet piles 3 are installed around the foundation pit, and the corbels 4 are fixedly connected to the inner wall of the sheet piles 3. The walers 9 are placed laterally on the upper side of the corbels. The steel supports include a main body 5, a push plate 6, and a drive assembly 7. The drive assembly 7 includes a screw 71, a screw sleeve 72, a support sleeve 73, a drive shaft 74, a worm gear 75, and a worm wheel 76. The support sleeve 73 abuts against the upper side of the corbels 4, and the screw sleeve 72 is coaxially fixedly connected to the steel supports through the support sleeve 73. At the end of the main body 5, the screw 71 passes through the screw sleeve 72 and is threadedly connected to the screw sleeve 72. The end of the screw 71 away from the steel support main body 5 is rotatably connected to the push plate 6. The push plate 6 abuts against the inner side of the waler 9. The other end of the screw 71 is coaxially provided with a transmission groove. One end of the transmission shaft 74 is slidably connected in the transmission groove. The other end of the transmission shaft 74 is fixedly connected to the worm gear 76. The worm 75 is rotatably connected in the support sleeve 73 and cooperates with the worm gear 76. The upper end of the worm 75 protrudes from the upper side of the support sleeve 73 so as to connect to an external drive.

[0021] With the above settings, the external drive provides driving force to the drive assembly 7. The drive assembly 7 can self-lock after applying thrust to the sheet pile 3 through the push plate 6. The external drive can be removed to save operating space in the foundation pit and there is no risk of oil leakage. The removed external drive can be used for the installation of other steel supports. That is, multiple steel supports share one set of external drives to simplify the construction site equipment and facilitate equipment management.

[0022] Specifically, when the retaining system of this application is used for bridge abutment construction, the construction design area is first laid out, and steel sheet piles 3 are driven downward around the design position of the foundation pit. Then, the earthwork is excavated downward, and supports are erected as excavation progresses. When supporting the steel supports, the inner surface of the steel sheet piles 3 is cleaned first, and the corbels 4 are welded to the inner side of the steel sheet piles 3. The walers 9 are placed horizontally on the upper side of the corbels. The steel supports are hoisted by a crane, and the support sleeves 73 at the end of the main body 5 of the steel supports are placed on the upper side of the corbels 4. An external actuator, such as an electric wrench, is used. The upper end of the worm gear has a hexagonal structure. The external actuator is connected to the upper end of the worm gear 75 to drive the worm gear 75 to rotate. The worm wheel 76 and the worm gear 75 have torque amplification functions, which facilitates the worm gear 75 to drive the screw 71 to rotate through the worm wheel 76 and the drive shaft 74. The drive shaft 74 and the worm wheel 76 are rotatably connected in the support sleeve 73 and cannot move back and forth. The drive shaft 74 and the screw 71 cannot rotate relative to each other, but the drive shaft 74 can drive the screw 71 to rotate synchronously. 71 rotates relative to the sleeve 72, and the screw 71 and push plate 6 move synchronously toward the waler 9. The transmission shaft 74 slides between itself and the transmission groove, without affecting the forward and backward movement of the screw 71. Finally, the push plate contacts the inner side of the waler 9, and the screw 71 applies a thrust to the sheet pile 3 through the push plate 6 and the waler 9 to prevent the sheet pile from deforming inward. A pressure sensor is installed between the support sleeve 73 and the steel support body 5 to know the thrust of the drive assembly 7 on the sheet pile 3, or the thrust of the push plate 6 is calculated by the torque output of the electric wrench. When the thrust increases to the target value, the electric wrench stops working and separates from the upper end of the worm 75. The worm wheel 76 and the worm 75 also have a self-locking function, and the screw 71 and the sleeve 72 also have a self-locking function. That is, the drive assembly 7 of this application has a double self-locking function, thereby ensuring that the drive assembly 7 will not retract after the electric wrench stops outputting driving force, ensuring that the inner side of the sheet pile 3 is stably supported by the steel support.

[0023] As one implementation, the steel support also includes a self-locking component 8, which includes a guide sleeve 81, a guide rod 82, and a locking sleeve 83. The guide sleeve 81 is arranged parallel to the side of the threaded sleeve 72 and is fixedly connected to the steel support body 5. The end of the guide sleeve 81 away from the steel support body 5 has a conical surface along its inner circumference. One end of the guide rod 82 is slidably connected in the guide sleeve 81, and the other end of the guide rod 82 is fixedly connected to the push plate 6. The locking sleeve 83 includes a support ring 831 and a wedge 832. The support ring 831 is slidably sleeved on the guide rod 82. Multiple wedges 832 are fixedly connected circumferentially on the side of the support ring 831 near the guide sleeve 81. The outer side of the wedge 832 is in contact with the conical surface, and the inner side of the wedge 832 clamps the guide rod 82.

[0024] The above settings improve the stability of the steel support.

[0025] In this application, the guide sleeve 81 is parallel to the steel support body 5, and the guide rod 82 is coaxially arranged with the guide sleeve 81. When the push plate 6 moves towards the waler 9 under the action of the drive assembly 7, the push plate 6 drives the guide rod 82 to move towards the waler 9 simultaneously. At this time, the locking sleeve 83 disengages from the conical surface. Specifically, the locking sleeve 83 is located on the side of the guide sleeve 81 closest to the steel sheet pile 3. After the push plate 6 presses against the waler 9, the locking sleeve 83 is manually pushed so that the outer side of the wedge block 832 of the locking sleeve 83 fits against the conical surface. Figure 3 To prevent the self-locking assembly 8 from shrinking, that is, to prevent the push plate 6 from retracting, to prevent the sheet pile 3 from deforming inward, and to prevent the screw 71 from deforming due to excessive force.

[0026] As one implementation, the self-locking assembly 8 also includes a spring 84, which is sleeved on the guide rod 82. One end of the spring 84 is fixedly connected to the push plate 6, and the other end of the spring 84 is fixedly connected to the lock sleeve 83.

[0027] With the above settings, the self-locking component 8 can achieve the self-locking function.

[0028] When the push plate 6 moves toward the waler 9 under the action of the drive assembly 7, the guide rod 82 moves toward the waler 9 along with the push plate 6. The outer side of the wedge block 832 of the locking sleeve 83 is always in contact with the conical surface under the action of the spring 84. After the push plate 6 moves to the position, since the outer side of the wedge block 832 is in contact with the conical surface, as the push plate 6 and the guide rod 82 stop, the locking sleeve 83 automatically locks the guide rod 82, preventing the guide rod 82 from moving into the guide sleeve 81, that is, preventing the self-locking assembly 8 from shortening, thereby preventing the sheet pile 3 from deforming inward.

[0029] As one implementation method, two self-locking components 8 are provided, symmetrically arranged on opposite sides of the driving component 7.

[0030] The above settings further enhance the stability of the steel support.

[0031] As one implementation method, the guide sleeve 81 abuts against the upper side of the bracket 4.

[0032] The above settings prevent the steel support end from rotating on the bracket 4.

[0033] As one implementation, the cross-section of the transmission groove is square, and the cross-section of the transmission shaft 74 is adapted to the cross-section of the transmission groove.

[0034] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A foundation pit retaining system, characterized in that, The structure includes sheet piles, steel supports, walers, and corbels. The sheet piles are installed around the perimeter of the foundation pit. The corbels are fixedly connected to the inner wall of the sheet piles. The walers are placed laterally on the upper side of the corbels. The steel supports include a main body, a push plate, and a drive assembly. The drive assembly includes a screw, a threaded sleeve, a support sleeve, a drive shaft, a worm gear, and a worm wheel. The support sleeve abuts against the upper side of the corbel. The threaded sleeve is coaxially fixedly connected to the end of the main body of the steel support through the support sleeve. The screw passes through the threaded sleeve and is threadedly connected to the threaded sleeve. The end of the screw away from the main body of the steel support is rotatably connected to the push plate. The push plate abuts against the inner side of the walers. The other end of the screw is coaxially provided with a transmission groove. One end of the drive shaft is slidably connected in the transmission groove, and the other end of the drive shaft is fixedly connected to the worm wheel. The worm gear is rotatably connected in the support sleeve and cooperates with the worm wheel. The upper end of the worm gear protrudes from the upper side of the support sleeve to connect to an external drive unit.

2. The foundation pit retaining system according to claim 1, characterized in that, The steel support also includes a self-locking assembly, which includes a guide sleeve, a guide rod, and a locking sleeve. The guide sleeve is arranged parallel to the side of the threaded sleeve and is fixedly connected to the main body of the steel support. The end of the guide sleeve away from the main body of the steel support has a conical surface along its inner circumference. One end of the guide rod is slidably connected in the guide sleeve, and the other end of the guide rod is fixedly connected to the push plate. The locking sleeve includes a support ring and a wedge. The support ring is slidably sleeved on the guide rod. Multiple wedges are fixedly connected circumferentially on the side of the support ring near the guide sleeve. The outer side of the wedge is in contact with the conical surface, and the inner side of the wedge clamps the guide rod.

3. The foundation pit retaining system according to claim 2, characterized in that, The self-locking assembly also includes a spring, which is sleeved on the guide rod. One end of the spring is fixedly connected to the push plate, and the other end of the spring is fixedly connected to the lock sleeve.

4. The foundation pit retaining system according to claim 2, characterized in that, Two self-locking components are provided, symmetrically arranged on opposite sides of the drive component.

5. The foundation pit retaining system according to claim 2, characterized in that, The guide sleeve abuts against the upper side of the cow leg.

6. The foundation pit retaining system according to claim 2, characterized in that, The cross-section of the transmission groove is square, and the cross-section of the transmission shaft is adapted to the cross-section of the transmission groove.

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