CN217536995U

CN217536995U - Foundation pit supporting structure

Info

Publication number: CN217536995U
Application number: CN202221359611.1U
Authority: CN
Inventors: 翁利新; 包方寿; 李进文
Original assignee: China Coal Zhejiang Infrastructure Construction Co ltd
Current assignee: China Coal Zhejiang Infrastructure Construction Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-10-04
Anticipated expiration: 2032-05-30

Abstract

The application relates to a foundation pit supporting structure which comprises a main rod, a support rod arranged on the main rod, two steel pipes which are respectively arranged at two ends of the main rod in a sliding manner, and a driving mechanism which is arranged on the main rod and used for pushing the two steel pipes to slide in a back-to-back direction; the main rod is provided with a limiting mechanism for limiting the separation of the steel pipe; and the main rod is provided with a locking mechanism for locking the sliding of the steel pipe. This application has the size difference that exists between compensateing steel pipe and the foundation ditch, reduces the time of work progress and the effect of energy consumption.

Description

Foundation pit supporting structure

Technical Field

The application relates to foundation ditch building technical field especially relates to a foundation ditch supporting construction.

Background

The foundation pit is constructed by adopting an open-cut sequential construction method, and the construction method and the main construction sequence are as follows: leveling field → surveying and paying-off → drilling pile, column pile construction → high-pressure jet grouting pile construction → excavating to the elevation of the bottom of a crown beam → constructing the crown beam → excavating foundation pit to the first support bottom → constructing waist beam and first steel support → excavating to the bottom → pouring concrete cushion to the side of a supporting structure in full hall → after the concrete of the cushion reaches maintenance period → excavating local pit earthwork such as elevator shaft and the like → constructing basement bottom plate → pouring bottom plate concrete to the side of the supporting pile → arranging force transfer blocks at the floor and the negative floor, and after the concrete strength reaches 80%, sequentially dismantling the steel support → constructing the basement main structure to +/-0.00 → backfilling the side wall of the foundation pit.

Wherein, the installation sequence related to the steel support is as follows: measuring and positioning → digging the earth on the first layer → installing a bracket of an upright post → installing a steel support → applying prestress → tightening a sizing block of a sizing block → removing a jack. And the steel support hoisting sequence is as follows: the main support is placed first, and then the transverse connecting rod is placed. And (3) carrying out steel support hoisting operation by adopting a truck crane, dividing the steel support into a plurality of sections at the interval of the stand columns, and after pre-assembling each section in the site is completed, placing each section of steel support on the bracket by adopting a crane until the whole section of steel support is placed. Then the application of the prestress: (1) the support pre-applied axial force is 50% of the designed axial force and is applied step by step. The first time is 50% of the design support pre-axial force, the second time is 80% of the design support pre-axial force, and the third time is 100% of the design support pre-axial force; (2) before steel support stress application, pre-applied axial force is applied to the movable end part of the steel support for three times through a hydraulic jack, the steel support is observed to change for five minutes after the first stress application is carried out to 50% of the designed pre-applied axial force value, the steel support is observed to change for five minutes after the second stress application is carried out to 80% of the designed pre-applied value, the steel support is observed to change for five minutes after the third stress application is carried out to the designed pre-applied axial force, and when the steel support is observed to be normal and the reading of a pressure gauge is stable and has no abnormity, the movable end is locked by a steel wedge when the pre-applied axial force is consistent with the monitoring data of the steel support axial force.

And the construction sequence of steel support dismantling is as follows: the jack is in place → the steel support is unloaded power → the steel wedge block is dismantled → the steel support is lifted out of the foundation pit → the steel support is arranged and stored → the yard is cleared after work.

In the construction process of the implementation mode, the length or the width of the foundation pit is built according to the design size, the situation that the size of the steel pipe cannot be well adapted to the actual size of the foundation pit can exist, for example, two steel pipes are too short, three steel pipes are too long, the length of the steel pipe is standard length, a common solution is to find a steel pipe with a short size for connection, but the steel pipe with the short size needs to be hoisted in the mode and connected through bolts, and the whole process is time-consuming and labor-consuming.

SUMMERY OF THE UTILITY MODEL

In order to compensate the size difference that exists between steel pipe and the foundation ditch, reduce the time and the energy consumption of work progress, this application provides a foundation ditch supporting construction.

The application provides a foundation ditch supporting construction adopts following technical scheme:

a foundation pit supporting structure comprises a main rod, a support rod arranged on the main rod, two steel pipes arranged at two ends of the main rod in a sliding mode respectively, and a driving mechanism arranged on the main rod and used for pushing the two steel pipes to slide in the back-to-back direction;

the main rod is provided with a limiting mechanism for limiting the separation of the steel pipe;

and the main rod is provided with a locking mechanism for locking the sliding of the steel pipe.

Through adopting above-mentioned technical scheme, actuating mechanism promotes the steel pipe and slides, makes the steel pipe of mobile jib both sides remove to the lateral wall of foundation ditch respectively, in order to compensate the space difference between whole length dimension of steel pipe and the foundation ditch lateral wall interval size, make the better lateral wall interval size that satisfies the foundation ditch of the whole length dimension of steel pipe, thereby need not to hoist a shorter steel pipe of size again and compensate the gap difference, can carry out the installation of steel pipe to the foundation ditch lateral wall support by the efficient, reduce the time and the energy consumption of work progress.

Preferably, stop gear is including setting up the driving cylinder on the mobile jib, the drive end of driving cylinder is for being used for the piston rod of butt steel pipe inner wall, be clearance sliding fit between mobile jib and the steel pipe.

Through adopting above-mentioned technical scheme, the actuating cylinder drives the piston rod and removes, makes the piston rod support tightly on the inner wall of steel pipe, because of the clearance fit that slides between steel pipe and the mobile jib, when the piston rod supported tightly the steel pipe inner wall, the steel pipe can be restricted under the effect of frictional force and remove to reach the limiting displacement to the steel pipe removal, reduce the risk that the steel pipe dropped from the mobile jib.

Preferably, the plurality of driving cylinders are arranged on the main rod, the driving cylinders are symmetrically arranged on the plane where the axis of the steel pipe is located, and the end face, close to the inner wall of the steel pipe, of the piston rod is provided with a friction piece.

By adopting the technical scheme, the driving cylinders are arranged in a plurality of ways, so that the acting force of the piston rods on the inner wall of the steel pipe is more balanced, and the condition that the steel pipe deviates under the action of the unidirectional piston rods is reduced; the friction piece improves the friction force between the piston rod and the inner wall of the steel pipe, and the limiting effect of the piston rod on the steel pipe is improved.

Preferably, the inner wall of the steel pipe is provided with a clamping groove for clamping the piston rod.

Through adopting above-mentioned technical scheme, set up the draw-in groove, make the one end of piston rod can insert the draw-in groove, the joint effort compares in frictional force, further reduces the risk that the steel pipe breaks away from the mobile jib.

Preferably, actuating mechanism includes the motor, sets up in the worm of motor output, rotate the worm wheel of connecting on the mobile jib, with the gear of worm wheel coaxial coupling and slide and set up the rack that is used for butt steel pipe one end on the mobile jib, worm wheel and worm meshing, gear and rack toothing.

Through adopting above-mentioned technical scheme, the motor drives the worm and rotates, and the worm drives the worm wheel and rotates, and the worm wheel drives gear revolve, and the gear drives the rack and slides on the mobile jib, and rack butt steel pipe drives the steel pipe and slides on the mobile jib to this drive that realizes the steel pipe.

Preferably, the end of the rack is provided with an annular abutting piece which is sleeved on the main rod in a sliding manner and used for abutting against the end of the steel pipe.

Through adopting above-mentioned technical scheme, set up the butt piece, increase the area of contact between rack and the steel pipe, the better promotion steel pipe of the rack of being convenient for slides.

Preferably, locking mechanical system establishes the piece around establishing on the mobile jib including setting up mounting and the cover on the steel pipe, the mounting with around establishing between the piece fixed connection, be equipped with around establishing the both ends of piece and will encircle the locking piece of establishing the piece cramping on the mobile jib.

Through adopting above-mentioned technical scheme, operation locking piece makes around establishing a complete ring-type of formation of piece, makes around establishing the piece under the effect of locking piece, tightly cramps the mounting on the mobile jib to realize the locking of steel pipe on the mobile jib.

Preferably, the support rod is telescopically locked.

Through adopting above-mentioned technical scheme, the length and dimension of bracing piece can extend, and the mobile jib of being convenient for is when hoisting the installation, and the bracing piece extends to and locks bottom the foundation ditch butt to be convenient for play the supporting role in subsequent work progress.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the driving mechanism pushes the steel pipes to slide, so that the steel pipes on the two sides of the main rod respectively move towards the side wall of the foundation pit to make up for the gap difference between the overall length dimension of the steel pipes and the distance dimension of the side wall of the foundation pit, the overall length dimension of the steel pipes can better meet the distance dimension of the side wall of the foundation pit, and therefore a steel pipe with a shorter dimension does not need to be hoisted to make up for the gap difference, the steel pipes can be efficiently installed on the support of the side wall of the foundation pit, and time and energy consumption in the construction process are reduced;

2. the driving cylinder drives the piston rod to move, so that the piston rod is abutted against the inner wall of the steel pipe, and due to the clearance sliding fit between the steel pipe and the main rod, when the piston rod is abutted against the inner wall of the steel pipe, the steel pipe can be limited to move under the action of friction force, so that the movement limiting effect on the steel pipe is achieved, and the risk that the steel pipe falls off from the main rod is reduced;

3. the motor drives the worm and rotates, and the worm drives the worm wheel and rotates, and the worm wheel drives gear revolve, and the gear drives the rack and slides on the mobile jib, and rack butt steel pipe drives the steel pipe and slides on the mobile jib to this realizes the drive of steel pipe.

Drawings

FIG. 1 is a schematic view of a connection structure between a steel pipe and a fender post;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 3 is a partially enlarged schematic view of portion A of FIG. 2;

fig. 4 is a schematic diagram of a partial explosion structure according to an embodiment of the present application.

Description of reference numerals: 1. a main rod; 2. a support bar; 3. a steel pipe; 4. a drive mechanism; 5. a motor; 6. a worm; 7. a worm gear; 8. a gear; 9. a rack; 10. a support platform; 11. a chute; 12. an abutting member; 13. a fixing member; 14. winding the part; 15. a locking member; 16. a first lever; 17. a second lever; 18. a bolt; 19. a drive cylinder; 20. a piston rod; 21. a friction member; 22. a clamping groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

Before this introduction's embodiment, the connection structure between steel shotcrete and the fender pile is as shown in fig. 1, is fixed with the triangular bracket through expansion bolts on the lateral wall of fender pile, is fixed with the steel on the triangular bracket and encloses the purlin, and steel pipe one end and steel enclose between the purlin for the stiff end, and the steel pipe other end encloses the purlin and pass through loose head and be connected formation expansion end, and follow-up need locks the expansion end with steel wedge promptly.

The embodiment of the application discloses a foundation pit supporting structure, as shown in fig. 2, including mobile jib 1, bracing piece 2, two steel pipes 3 and actuating mechanism 4. This embodiment is through addding mobile jib 1 and adjusting the whole length size of steel pipe 3, makes the quick adaptation foundation ditch lateral wall interval size of 3 whole length sizes of steel pipe, and is irrelevant with the structure between 3 and the fender pile of steel pipe, and the fixed knot that is connected between 3 and the fender pile of steel pipe is constructed and is still supported and be connected according to above-mentioned mode, and this application mainly explains the structure and the adjustment mode of steel pipe 3 in foundation ditch middle part position.

As shown in fig. 2 and 3, a support rod 2 is fixedly connected to a middle position of the main rod 1, and a longitudinal direction of the support rod 2 is arranged at a right angle to a longitudinal direction of the main rod 1. The two steel pipes 3 are respectively sleeved at two ends of the main rod 1 in the length direction in a sliding manner, and the steel pipes 3 are in clearance sliding fit with the main rod 1. The steel pipes 3 slide on the main rod 1 and are sleeved, so that the two steel pipes 3 can be conveniently adjusted in the overall length dimension, and can be adapted to the actual environment quickly no matter the length of the steel pipes needs to be lengthened or shortened.

As shown in fig. 3, further, the driving mechanism 4 includes a motor 5, a worm 6 disposed at an output end of the motor 5, a worm wheel 7 rotatably disposed, a gear 8 coaxially connected with the worm wheel 7, and a rack 9 slidably disposed on the main rod 1. Wherein, motor 5 can set up on bracing piece 2, also can set up on mobile jib 1, and this application does not do the restriction to the position setting of motor 5. In this embodiment, a supporting platform 10 is fixedly connected to the side wall of the supporting rod 2, the motor 5 is fixedly disposed on the supporting platform 10, the worm wheel 7 is also rotatably disposed on the supporting platform 10 around its central axis, and the worm wheel 7 and the worm 6 are engaged with each other. The gear 8 is arranged above the worm wheel 7, and the gear 8 and the worm wheel 7 are fixedly arranged on the same rotating shaft. The rack 9 is arranged along the length direction of the main rod 1 in a sliding mode, and the rack 9 is meshed with the gear 8, so that the gear 8 rotates to drive the rack 9 to slide. In the embodiment of the application, the sliding mode between the rack 9 and the main rod 1 adopts the sliding groove 11 formed in the main rod 1, the sliding block is fixed on the rack 9, and the sliding block slides in the sliding groove 11. The sliding groove 11 is preferably a T-shaped groove to reduce the occurrence of the rack 9 falling off the main rod 1.

As shown in fig. 2 and 3, in the embodiment of the present application, two sets of driving mechanisms 4 are provided, and the two sets of driving mechanisms 4 are symmetrically disposed about the main rod 1, and the two sets of driving mechanisms 4 respectively realize that the two steel pipes 3 move in the direction away from each other.

As shown in fig. 2 and 4, further, the end portions of the two sets of racks 9 are fixedly connected with the abutting pieces 12, in this embodiment, the abutting pieces 12 are arranged in a circular ring shape, and the abutting pieces 12 are slidably sleeved on the main rod 1. When the rack 9 moves, the abutting part 12 is driven to slide, the abutting part 12 abuts against the end part of the steel pipe 3, so that the contact area between the rack 9 and the steel pipe 3 is increased, and the rack 9 can better push the steel pipe 3 to move.

When the steel pipe 3 moves to a proper position, that is, when the size deviation between the overall length size of the steel pipe 3 and the distance between the side walls of the foundation pit is small, the position of the steel pipe 3 needs to be locked, so that a locking mechanism is arranged on the main rod 1, and the locking mechanism comprises a fixing piece 13, a winding piece 14 and a locking piece 15. Wherein, the fixed piece 13 is fixedly arranged at the end of the steel pipe 3, and the fixed piece 13 is provided with a plurality of, and a plurality of fixed pieces 13 are evenly arranged around the circumference of the steel pipe 3. The winding piece 14 is fixed on the periphery of the fixed piece 13 and is arranged in an open ring shape. And the locking piece 15 is arranged at the opening of the winding piece 14, in the embodiment, the locking piece 15 is a combination of a screw rod and a nut, the winding piece 14 is tightly pressed on the main rod 1 by acting force through screwing the nut, and the position of the steel pipe 3 is locked through friction force.

As shown in fig. 2 and 3, further, the support rod 2 is provided with a telescopic locking device, i.e. the length of the support rod 2 can be adjusted and locked. Specifically, in this embodiment, the support rod 2 includes a first rod 16 and a second rod 17, and the first rod 16 is sleeved on the periphery of the second rod 17, so as to adjust the length of the support rod 2 by sliding the sleeve. The locking system is a system in which the bolt 18 abuts, that is, the bolt 18 is provided on the outer wall of the first lever 16, and the second lever 17 is locked to the first lever 16 by tightening the bolt 18. The supporting rod 2 with adjustable length is convenient for the main rod 1 to extend to abut against the bottom of the foundation pit and be locked when being hoisted for installation, so that the supporting rod 2 can play a supporting role in the subsequent construction process.

As shown in fig. 2 and 4, the main rod 1 is further provided with a limiting mechanism for limiting the steel pipe 3 from disengaging, and specifically, the limiting mechanism includes a driving cylinder 19 and a piston rod 20 disposed at a driving end of the driving cylinder 19. The driving cylinder 19 is fixedly arranged at the end of the main rod 1, i.e. the driving cylinder 19 is positioned inside the steel pipe 3. In this embodiment, two driving cylinders 19 are disposed at two ends of the main rod 1, and two driving cylinders 19 are disposed at each end, the two driving cylinders 19 are symmetrically disposed about a plane where the axis of the steel pipe 3 is located, and the end surfaces of the piston rods 20 close to the inner wall of the steel pipe 3 are both provided with friction members 21. When the position of the steel tube 3 needs to be locked, all the driving cylinders 19 are started, the piston rod 20 is enabled to abut against the inner wall of the steel tube 3, and the steel tube 3 is limited to move under the action of friction force, so that the effect of locking the steel tube 3 is achieved. Further, when the steel pipe 3 needs to be detached from the main rod 1, the driving cylinder 19 is closed, the steel pipe 3 can be easily detached without limitation, and transportation convenience in the actual use process is improved. And two driving cylinders 19 are arranged at each end, so that the acting force of the piston rod 20 on the inner wall of the steel pipe 3 can be balanced, and the unidirectional deviation of the steel pipe 3 under the action of the piston rod 20 is reduced.

As shown in fig. 4, further, two clamping grooves 22 are formed in the inner wall of the steel pipe 3, when the steel pipe 3 moves to a position to be separated from the main rod 1, the piston rod 20 is inserted into the clamping groove 22 under the action of the driving cylinder 19, and the clamping acting force is compared with the friction force, so that the risk that the steel pipe 3 is separated from the main rod 1 is further reduced.

The implementation principle is as follows:

in the installation that carries out the steel shotcrete in the foundation ditch, at first mobile jib 1, bracing piece 2 and steel pipe 3 etc. are hoisted, carry out length adjustment with bracing piece 2, make bracing piece 2 play the supporting role, and make the stand bracket support two steel pipes 3, play motor 5 this moment, make motor 5 drive worm 6 rotate, worm 6 drives worm wheel 7 and rotates, worm wheel 7 drives gear 8 and rotates, gear 8 drives rack 9 and slides on mobile jib 1, rack 9 butt steel pipe 3 drives steel pipe 3 and slides on mobile jib 1, make the steel pipe 3 of mobile jib 1 both sides move to the lateral wall of foundation ditch respectively, in order to compensate the gap difference between 3 whole length sizes of steel pipe and the lateral wall interval size of foundation ditch, make the better lateral wall interval size that satisfies the foundation ditch of 3 whole length sizes of steel pipe, thereby need not to hoist the shorter steel pipe 3 of a size again and compensate the gap, can carry out the installation that steel pipe 3 supported the lateral wall of foundation ditch with the efficient, reduce time and the energy consumption of work progress.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a foundation ditch supporting construction which characterized in that: the steel tube sliding mechanism comprises a main rod (1), a support rod (2) arranged on the main rod (1), two steel tubes (3) which are respectively arranged at two ends of the main rod (1) in a sliding manner, and a driving mechanism (4) which is arranged on the main rod (1) and used for pushing the two steel tubes (3) to slide in a back-away direction;

the main rod (1) is provided with a limiting mechanism for limiting the separation of the steel pipe (3);

and a locking mechanism for locking the sliding of the steel pipe (3) is arranged on the main rod (1).

2. A foundation pit supporting construction according to claim 1, wherein: stop gear is including setting up driving cylinder (19) on mobile jib (1), the drive end of driving cylinder (19) is for being used for butt steel pipe (3) inner wall's piston rod (20), be clearance sliding fit between mobile jib (1) and steel pipe (3).

3. A foundation pit supporting construction according to claim 2, wherein: the driving cylinders (19) are arranged on the main rod (1) in a plurality of ways, the driving cylinders (19) are symmetrically arranged relative to the plane where the axis of the steel pipe (3) is located, and the end face, close to the inner wall of the steel pipe (3), of the piston rod (20) is provided with a friction piece (21).

4. A foundation pit supporting construction according to claim 3, wherein: and the inner wall of the steel pipe (3) is provided with a clamping groove (22) for clamping the piston rod (20).

5. A foundation pit supporting construction according to claim 1, wherein: actuating mechanism (4) include motor (5), set up in worm (6) of motor (5) output, rotate worm wheel (7) of connecting on mobile jib (1), with gear (8) and the rack (9) that slide that set up on mobile jib (1) and be used for butt steel pipe (3) one end, worm wheel (7) and worm (6) meshing, gear (8) and rack (9) meshing.

6. A foundation pit supporting construction according to claim 5, wherein: the end part of the rack (9) is provided with an annular abutting part (12) which is sleeved on the main rod (1) in a sliding manner and used for abutting against the end part of the steel pipe (3).

7. A foundation pit supporting construction according to claim 1, wherein: locking mechanical system establishes around establishing piece (14) on mobile jib (1) including setting up mounting (13) and the cover on steel pipe (3), mounting (13) with around establishing fixed connection between piece (14), be equipped with around the both ends of establishing piece (14) and will encircle locking piece (15) of establishing piece (14) on mobile jib (1).

8. A foundation pit supporting construction according to claim 1, wherein: the supporting rod is arranged in a telescopic locking mode.