A reinforcing structure for foundation pit earthwork excavation construction

Abstract

The present application relates to the technical field of foundation pit construction, and particularly relates to a reinforcing structure for foundation pit earthwork and masonry excavation construction; the reinforcing structure comprises a cofferdam and a coffering, the coffering is uniformly and fixedly provided with brackets on two opposite sides; the two brackets are provided with a steel support; the present application is provided with a taper column and a taper slot self-locking mechanism, which can complete the circumferential constraint of the steel pipe during the sliding of the stop block along the limiting slot, push the limiting block to twist and reset to extrude the taper column to form axial locking, replace the alignment of the bolt hole and manual fastening in a single insertion, and significantly improve the construction efficiency; meanwhile, when the subsequent steel pipe is installed, the front end of the connecting column is attached to the rear end of the previous steel pipe, the displacement of the push-pull rod is limited by physical blocking, the limiting block is forced to continuously extrude the taper column to form multi-segment interlocking constraint; and the limiting block, the torsional spring rod and the stop block are all built-in in the closed cavity of the connecting column, combined with the sealing formed by the attachment of the steel pipe end face, the damp environment of the foundation pit is double-isolated, and the bearing capacity and the detachability are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit construction, in particular to a reinforcing structure for foundation pit earthwork excavation construction. BACKGROUND

[0002] The foundation pit excavation is a soil and rock excavation engineering for building underground structures, and its core is to maintain the slope stability and control the surrounding environment impact through a reasonable supporting system. During the excavation process, the principle of layering and segmentation, supporting first and digging later should be followed. The steel sheet pile, surrounding purlin and steel support jointly constitute a typical foundation pit supporting system: the cofferdam composed of steel sheet piles serves as an outer barrier to bear the soil retaining and water stopping functions; the surrounding purlin is horizontally fixed inside the cofferdam; and the steel support is transversely clamped between the surrounding purlins, and actively restrains the soil displacement through prestress.

[0003] The existing steel support adopts a segmented hoisting process: first, each section of the steel support is hoisted into place by a crane, and then fixed by bolt connection. Then, the adjustable loose joint is installed, and the assembled steel support is placed on the surrounding purlin. Then, the hydraulic jack is installed at the loose joint, and the movable section is clamped against the retaining structure by the hydraulic pump pressure. When the predetermined pressure is reached, the steel wedge block is locked and fixed.

[0004] However, there are the following problems in the current steel support disassembly process: when using bolt segmented connection, bolt penetration, hole alignment and manual tightening operation need to be performed on each section of the steel support. This process needs to repeatedly adjust the position of the components and is restricted by the number of bolts, which significantly increases the time consumption of single node connection, limits the construction efficiency, and the bolt connection only realizes the local fixation of the adjacent two sections. The locking state of the previous section cannot be strengthened by the installation of the subsequent section, and the bolt must be manually tightened node by node to maintain the connection rigidity. Otherwise, the cumulative gap of multiple sections will weaken the overall stability of the support system. In addition, the bolts are exposed to the humid environment of the foundation pit for a long time, which easily causes rust, affects the service life and overall bearing capacity of the steel support, and after rusting, the components are easily stuck, which seriously affects the subsequent disassembly operation.

[0005] Therefore, the problems of complicated bolt connection operation between each section of the steel support, insufficient rigidity and autonomy after connection, and exposure of the bolts affecting the overall stability of the support structure and the convenience of disassembly are technical problems that need to be solved by those skilled in the art. SUMMARY

[0006] In view of the above problems, the present application provides a reinforcing structure for foundation pit earthwork excavation construction to solve the above technical problems.

[0007] In order to achieve the above object, the embodiment of the present application provides the following technical scheme: the embodiment of the present application provides a reinforcing structure for foundation pit earthwork excavation construction, which comprises a cofferdam and a coffering purlin, and the coffering purlin is uniformly and fixedly provided with a bracket on the two sides opposite to each other; and the two brackets opposite to each other are jointly provided with a steel support.

[0008] The steel support comprises a movable joint composed of a movable section and a fixed section, a plurality of steel pipes are sequentially installed on the rear side of the movable section through a connecting part, and a conical column is arranged at the rear end of the movable section and the rear end of the remaining steel pipes except the last steel pipe.

[0009] The connecting part comprises a connecting column fixedly installed at the front end of the steel pipe, a tapered groove is formed at the front end of the connecting column, a limiting groove is uniformly formed in the tapered groove along the circumferential direction, a limiting block is hingedly connected in the limiting groove through a torsion spring rod, a plurality of stop blocks are arranged on the conical column, and a push-pull part is jointly arranged on the connecting column and the steel pipe.

[0010] The push-pull part comprises a plurality of pairs of push-pull rods which are slidingly installed at the front end of the steel pipe and correspond to the limiting blocks, and the front end of the push-pull rod slidingly penetrates into the adjacent connecting column on the front side.

[0011] When the tapered groove cooperates with the conical column, the stop blocks are located in the limiting groove to limit the circumferential rotation of the steel pipe, and the limiting block extrudes the conical column and the stop block to form axial limiting; the single insertion connection is completed without bolt fastening, and when the subsequent steel pipe is installed, the front end of the connecting column of the subsequent steel pipe is attached to the rear end of the previous steel pipe, the movement of the push-pull rod is limited to keep the limiting block extruded, and the interlocking constraint between the segments is formed.

[0012] As a preferred scheme, the push-pull part further comprises a connecting seat fixedly installed on the torsion spring rod, each pair of push-pull rods is symmetrical about the corresponding connecting seat, a slot is formed in the connecting column corresponding to the connecting seat, the slot is in communication with the limiting groove and the tapered groove, and the connecting seat and the corresponding limiting block form a V-shaped structure with the opening facing the axis of the corresponding tapered groove.

[0013] As a preferred scheme, a driving member for driving the rotation of the connecting seat is arranged on the push-pull rod, the driving member comprises a driving plate fixedly installed at the front end of the push-pull rod, a waist groove is formed in the driving plate, and a roller shaft is fixedly installed on the connecting seat and slidingly penetrates through the corresponding waist groove.

[0014] As a preferred scheme, the rear end of the steel pipe is provided with a ring groove, a fixing ring is fixedly installed in the ring groove after the rear end of the push-pull rod penetrates through the corresponding steel pipe, and the fixing ring is movably matched with the ring groove.

[0015] As a preferred scheme, four limiting columns arranged in a rectangular shape are fixedly installed at the front end of the fixed section and the rear end of the last steel pipe, and the limiting columns slidingly penetrate through the corresponding bracket and the coffering purlin.

[0016] As a preferred scheme, the contact surface of the steel pipe and the contact surface of the steel pipe and the loose joint are provided with rubber pads; the connecting column is provided with mounting holes corresponding to the torsion spring rods and penetrating through the connecting column at both ends, the torsion spring rods are rotatably installed in the mounting holes, and rubber plugs are embedded in both ends of the mounting holes.

[0017] As a preferred scheme, the rear end of the steel pipe is uniformly provided with a disassembly groove communicated with the corresponding ring groove along the circumference of the steel pipe.

[0018] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects: first, the taper column and the taper groove are inserted and locked to complete the circumferential constraint of the steel pipe during the sliding of the stop block along the limiting groove, to push the limiting block to twist and reset to extrude the taper column to form axial locking, to replace the hole alignment of the bolt and manual fastening in a single insertion, and to significantly improve the construction efficiency; meanwhile, when the subsequent steel pipe is installed, the front end of the connecting column is attached to the rear end of the previous steel pipe, the displacement of the push-pull rod is limited by physical blocking, the limiting block is forced to continuously extrude the taper column to form a multi-segment interlocking constraint; and the limiting block, the torsion spring rod and the stop block are completely built-in in the closed cavity of the connecting column, combined with the sealing formed by the attachment of the steel pipe end face, the damp environment of the foundation pit is double-encapsulated to guarantee the bearing capacity and the detachability.

[0019] Second, the stop block is embedded in the limiting groove to instantaneously limit the circumferential rotation of the steel pipe, to push the limiting block to rotate and automatically reset to lock the taper column, to complete the axial and circumferential fixation in a single action, and to eliminate the bolt insertion and alignment process; the subsequent steel pipe is forced to compress the push-pull rod through the end face attachment to the previous steel pipe, to limit the backtracking of the push-pull rod to maintain the constant pressure state of the limiting block on the taper column, and to eliminate the need for manual retightening.

[0020] Third, the limiting block, the torsion spring rod and the stop block are completely sealed in the connecting column cavity by the built-in closed structure to block the rainwater from contacting the connecting components; the end face attachment of the steel pipe further forms an auxiliary sealing interface, there is no relative friction between the taper column and the limiting block in the static extrusion, and rust adhesion is avoided; when disassembled, the rear pull fixing ring drives the push-pull rod to move backward, the limiting block is rotated and separated from the taper column through mechanical linkage, there is no rust resistance interference in the unlocking process, and the maintenance cost is significantly reduced.

[0021] Additional aspects and advantages of the application will be set forth in part in the following description, and in part will become apparent to those skilled in the art from the following description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can also obtain other drawings according to the provided drawings without any creative labor.

[0023] Figure 1 It is a schematic view of the three-dimensional structure of the present application.

[0024] Figure 2 It is a schematic view of the structure between the bracket and the steel support of the present application.

[0025] Figure 3 It is a schematic view of the structure of the disassembly groove of the present application.

[0026] Figure 4 It is a partial structure sectional view of the push-pull part of the present application.

[0027] Figure 5 It is a schematic view of the three-dimensional structure of the push-pull part of the present application.

[0028] Figure 6 It is a schematic view of the structure of the tapered groove of the present application.

[0029] Reference signs: 1, cofferdam; 2, coffer; 3, bracket; 4, steel support; 40, loose joint; 400, movable section; 401, fixed section; 41, steel pipe; 42, tapered column; 43, connecting part; 430, connecting column; 431, tapered groove; 432, torsion spring rod; 433, limiting block; 434, stop block; 5, push-pull part; 50, push-pull rod; 51, connecting seat; 52, driving plate; 53, roller shaft; 54, fixed ring; 540, disassembly groove; 55, limiting column. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] As shown in Figure 1 and Figure 2 , a reinforcing structure for foundation pit earthwork excavation construction, comprising a cofferdam 1 and a coffer 2, the coffer 2 is uniformly and fixedly installed with a bracket 3 in L-shaped structure on the two sides opposite to each other; the cofferdam 1 and the coffer 2 are both prior art, which are not the technical points of the present application, and will not be described in detail here. The two brackets 3 opposite to each other are provided with a steel support 4.

[0032] As shown in Figure 1 , Figure 2 and Figure 3As shown, the steel support 4 comprises a hinge head 40 composed of a rear movable section 400 and a front fixed section 401, the movable section 400 is sequentially provided with multiple steel pipes 41 through a connecting part 43 at the rear side, and the rear end of each steel pipe 41 except the last one and the rear end of the movable section 400 are provided with a tapered column 42.

[0033] As shown in Figure 1 , Figure 3 , Figure 4 and Figure 5 , the connecting part 43 comprises a connecting column 430 fixedly installed at the front end of the steel pipe 41, a tapered groove 431 is formed at the front end of the connecting column 430, a limiting groove is uniformly formed in the circumferential direction of the tapered groove 431, the limiting groove is in communication with the corresponding tapered groove 431, a limiting block 433 is hingedly connected in the limiting groove through a torsion spring rod 432, a stop block 434 corresponding to the limiting groove is fixedly installed on the tapered column 42, the stop block 434 is in sliding fit with the corresponding limiting groove, and the connecting column 430 and the steel pipe 41 are jointly provided with a push-pull part 5.

[0034] As shown in Figure 4 and Figure 5 , the push-pull part 5 comprises multiple pairs of push-pull rods 50 slidingly installed at the front end of the steel pipe 41 and corresponding to the limiting block 433, and the front end of the push-pull rod 50 slidingly penetrates into the adjacent connecting column 430 at the front side.

[0035] As shown in Figure 3 and Figure 4 , the rear end of the steel pipe 41 is provided with a ring groove, the rear end of the push-pull rod 50 penetrates into the corresponding steel pipe 41 to the ring groove, and a fixing ring 54 is jointly fixedly installed in the ring groove, and the fixing ring 54 is in movable fit with the ring groove.

[0036] As shown in Figures 1 to 5As shown, in particular work, through the external crane will be put into the cofferdam 1 steel pipe 41 and the loose joint 40, and then in the loose joint 40 activity section 400 side after the installation of steel pipe 41, make the steel pipe 41 on the connecting column 430 taper slot 431 and the loose joint 40 on the tapered column 42 cooperation, and with the tapered column 42 inserted into the process of taper slot 431, the stop block 434 will slide in the limiting groove, and push the limiting block 433 to the side away from the axis of the taper slot 431 rotation, while the torsional spring rod 432 torsion, after the stop block 434 moves to the rear side of the limiting block 433, the limiting block 433 in the torsional spring rod 432 reset extrusion tapered column 42, while the limiting block 433 rear end and the corresponding front end of the stop block 434 touch, at this time the fixed ring 54 is located in the corresponding ring groove, continue to install the subsequent steel pipe 41 in the same way, the next steel pipe 41 on the connecting column 430 taper slot 431 and the tapered column 42 on the last steel pipe 41 cooperation, and the steel pipe 41 on the connecting column 430 front end face and the last steel pipe 41 rear end and the corresponding fixed ring 54 adhere to, to limit the movement of the push-pull rod 50, the limiting block 433 keeps extrusion limiting of the tapered column 42, form the interlocking constraint, continue to install the steel pipe 41 in this way until the installation to the required length of steel support 4, the crane will be put into the steel support 4 on the cofferdam 2 on the opposite two bracket 3.

[0037] As shown in Figure 4 , Figure 5 and Figure 6 , the push-pull part 5 further comprises a connecting seat 51 fixedly installed on the torsional spring rod 432, each pair of push-pull rods 50 is symmetrical about the corresponding connecting seat 51, and a slot corresponding to the connecting seat 51 is formed in the connecting column 430 in communication with the limiting groove and the taper slot 431, and the connecting seat 51 and the corresponding limiting block 433 form a V-shaped structure with the opening facing the axis of the corresponding taper slot 431.

[0038] As shown in Figure 4 , Figure 5 and Figure 6 , the push-pull rod 50 is provided with a driving member for driving the rotation of the connecting seat 51, and the driving member comprises a driving plate 52 fixedly installed on the front end of the push-pull rod 50, and a waist groove is formed in the driving plate 52, and a roller shaft 53 is fixedly installed on the connecting seat 51 and slides through the corresponding waist groove.

[0039] As shown in Figure 3 and Figure 4 , the rear end of the steel pipe 41 is uniformly provided with a dismounting groove 540 in communication with the corresponding ring groove along the circumference of the steel pipe 41, and the dismounting groove 540 provides operation space for the lever, facilitating the pulling out of the fixed ring 54 from the ring groove.

[0040] As shown in Figure 1 , Figure 2 , Figure 3 andFigure 6 As shown in the drawings, the front end of the fixed segment 401 and the rear end of the end steel pipe 41 are both fixedly installed with four limit columns 55 arranged in a rectangular shape, and the limit columns 55 slide through the corresponding bracket 3 and the surrounding purlin 2.

[0041] As shown in the drawings, Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown in the drawings, the contact surface of the steel pipe 41 and the contact surface of the steel pipe 41 and the loose joint 40 are both provided with rubber pads; the connecting column 430 is provided with mounting holes corresponding to the torsion spring rods 432 and penetrating through the connecting column 430 at both ends, the torsion spring rods 432 are rotationally installed in the mounting holes, and rubber plugs are embedded in the ports at both ends of the mounting holes.

[0042] As shown in the drawings, Figures 1 to 6 In specific work, the crane hoists the steel support 4 to the opposite two brackets 3 of the surrounding purlin 2, the limit column 55 on the end steel pipe 41 penetrates through the corresponding bracket 3 and the surrounding purlin 2, and the fixed segment 401 of the loose joint 40 is moved, so that the limit column 55 on the fixed segment 401 penetrates through the corresponding bracket 3 and the surrounding purlin 2; then the hydraulic jack is horizontally embedded in the reserved gap between the fixed segment 401 and the movable segment 400 of the loose joint 40, and the hydraulic jack base is fixed on the fixed segment 401 of the loose joint 40 on the side of the surrounding purlin 2, the piston rod pushes the movable segment 400 of the loose joint 40 and the steel pipe 41 to move, eliminates the initial gap of the support system, and changes the steel support 4 from a loose state to a rigid whole tightly surrounding the enclosure structure; and simultaneously inserts the steel wedge block between the movable segment 400 and the fixed segment 401 to complete mechanical locking, converts the hydraulic thrust into permanent prestress, then the hydraulic jack piston rod is retracted and returned to the original position, and the hydraulic jack is horizontally slid out of the gap of the loose joint 40, at this time the steel wedge block bears the entire axial force, and the rubber pads and torsion spring rods 432 are installed at the positions of the rubber plugs at each node connection to improve the overall sealing performance and further prevent the rusting of the internal connecting parts of the conical groove 431.

[0043] When disassembly is required, first, the hydraulic jack is reinstalled between the fixed segment 401 and the movable segment 400 of the loose joint 40, and the piston rod is in contact with the movable segment 400 of the loose joint 40, so as to timely take over the entire load of the steel support 4 in the subsequent process; then the steel wedge block is hammered to make the locking device out of the stressed state, at this time the jack takes over the entire load, and then the hydraulic jack piston rod is slowly retracted, and the hydraulic jack is removed. Then the limit column 55 on the fixed segment 401 is removed from the corresponding bracket 3 and the surrounding purlin 2, so as to hoist the steel support 4 away from the surrounding purlin 2 and place it on the ground for disassembly.

[0044] When disassembling, the fixed ring 54 is pulled axially by inserting a lever into the disassembling groove 540, and the fixed ring 54 drives all the push-pull rods 50 connected thereto to move backward, the push-pull rods 50 drive the connecting blocks to rotate through the cooperation of the waist grooves on the driving plate 52 and the roller shaft 53, the connecting blocks drive the limiting blocks 433 to rotate away from the conical column 42 and the corresponding stoppers 434 through the torsional spring rods 432, at this time, the torsional spring rods 432 are twisted; then the fixed ring 54 is kept pulling, the last steel pipe 41 is pulled backward to disengage from the adjacent steel pipe 41, and then the fixed ring 54 is released, the limiting blocks 433 are rotated to reset under the action of the torsional spring rods 432, ready for the next assembly limiting, and the quick disassembly of the remaining steel pipes 41 can be completed according to the above operation sequence.

[0045] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0046] In addition, the terms "first", "second", "No. 1", "No. 2" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "No. 1", "No. 2" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0047] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The embodiments of the specific implementation are the preferred embodiments of the present application, which do not limit the protection scope of the present application, so that any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A reinforcement structure for foundation pit earthwork excavation construction, comprising a cofferdam and a coaming, the coaming is uniformly fixed and installed with a bracket on both sides of the front and back opposite to each other; characterized in that: Steel supports are arranged on the two brackets opposite to each other; The steel support comprises a movable joint composed of a movable section and a fixed section, a plurality of steel pipes are sequentially installed on the rear side of the movable section through connecting parts, and the rear ends of the steel pipes except the last section and the rear end of the movable section are provided with tapered columns; The connecting part comprises a connecting column fixedly installed on the front end of the steel pipe, a tapered groove is formed on the front end of the connecting column, a limiting groove is uniformly formed on the circumference of the tapered groove, a limiting block is hingedly connected to the limiting groove through a torsion spring rod, a plurality of stop blocks are arranged on the tapered column, and a push-pull part is arranged on the connecting column and the steel pipe. The push-pull part comprises a plurality of pairs of push-pull rods which are slidingly installed on the front end of the steel pipe and correspond to the limiting blocks, and the front end of the push-pull rod slidingly penetrates into the adjacent connecting column on the front side; When the tapered groove cooperates with the tapered column, the stop blocks are located in the limiting groove to limit the circumferential rotation of the steel pipe, and the limiting block extrudes the tapered column and the stop block to form axial limiting; without bolt fastening, when the subsequent steel pipe is installed, the front end of the connecting column of the subsequent steel pipe is attached to the rear end of the previous steel pipe, the movement of the push-pull rod is limited to force the limiting block to remain in a locked state, thereby forming an internal closed anti-rust chain constraint between the steel pipe sections; The rear end of the steel pipe is provided with a ring groove, and the rear end of the push-pull rod penetrates into the ring groove through the corresponding steel pipe and is then fixedly installed with a fixing ring; The rear end of the steel pipe is uniformly provided with a disassembly groove which is in communication with the corresponding ring groove.

2. The reinforcing structure for foundation earthwork excavation construction according to claim 1, characterized in that: The push-pull part further comprises a connecting seat fixedly installed on the torsion spring rod, each pair of push-pull rods is symmetrical about the corresponding connecting seat, a slot is formed on the connecting column corresponding to the connecting seat, the slot is in communication with the limiting groove and the tapered groove, and the connecting seat and the corresponding limiting block form a V-shaped structure with the opening facing the axis of the corresponding tapered groove.

3. The reinforcing structure for foundation earthwork excavation construction according to claim 2, characterized in that: The push-pull rod is provided with a driving member for driving the rotation of the connecting seat, the driving member comprises a driving plate fixedly installed on the front end of the push-pull rod, a waist groove is formed on the driving plate, and a roller shaft is fixedly installed on the connecting seat and slidingly penetrates through the corresponding waist groove.

4. The reinforcing structure for foundation earthwork excavation construction according to claim 1, characterized in that: The front end of the fixed section and the rear end of the last section of the steel pipe are fixedly installed with four limiting columns arranged in a rectangular shape, and the limiting columns slidingly penetrate through the corresponding bracket and the surrounding purlin.

5. The reinforcing structure for foundation earthwork excavation construction according to claim 1, characterized in that: The contact surface of the steel pipe and the contact surface of the steel pipe and the movable joint are provided with rubber pads; a mounting hole corresponding to the torsion spring rod is formed on the connecting column, the torsion spring rod is rotatably installed in the mounting hole, and rubber plugs are embedded in the ports of the mounting hole.

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