Reinforcing structure for earth-rock excavation construction of foundation pit

Abstract

The invention relates to the technical field of foundation pit construction, in particular to a reinforcing structure for foundation pit earthwork excavation construction. Comprising a cofferdam and an enclosing purlin, and brackets are evenly and fixedly installed on the front and back opposite sides of the enclosing purlin; a steel support is arranged on the two brackets which are opposite front and back; by means of an insertion self-locking mechanism of the conical column and the conical groove, circumferential constraint of the steel pipe is completed in the process that the check block slides along the limiting groove, the limiting block is pushed to be twisted and then reset to extrude the conical column to form axial locking, bolt hole position alignment and manual fastening are replaced through single insertion, and the construction efficiency is remarkably improved; meanwhile, when a subsequent steel pipe is installed, the front end of a connecting column is attached to the rear end of a previous steel pipe, displacement of a push-pull rod is limited through physical blocking, and a limiting block is forced to continuously extrude a conical column to form multi-section linkage constraint; and the limiting block, the torsional spring rod and the check block are all arranged in a closed cavity of the connecting column, sealing formed by fitting of the end faces of the steel pipes is combined, the damp environment of the foundation pit is doubly isolated, and the bearing capacity and detachability are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, and in particular to a reinforcement structure for foundation pit earth and stone excavation construction. Background Art

[0002] Foundation pit excavation involves the excavation of earth and rock for the construction of underground structures. Its core objective is to maintain slope stability and control environmental impacts through a rational support system. The excavation process adheres to the principles of layered and segmented construction, with support prior to excavation. A typical foundation pit support system consists of steel sheet piles, perimeter purlins, and steel braces. A cofferdam composed of steel sheet piles acts as an external barrier, retaining soil and preventing water from leaking. Perimeter purlins are fixed horizontally to the inside of the cofferdam. Steel braces are tightened horizontally between the perimeter purlins, actively restraining soil displacement through prestressing.

[0003] The existing steel supports are assembled in sections: Each section is hoisted into place using a crane, secured with bolts, and then bolted together. Adjustable joints are then installed, and the assembled steel supports are placed on the purlins. A hydraulic jack is then installed at the joints, and pressure is applied by a hydraulic pump to press the movable sections against the enclosure structure. Once the desired pressure is reached, steel wedges are used to lock the sections in place.

[0004] However, the following problems currently exist in the process of disassembly and assembly of steel supports: when bolted segments are used for connection, each section of the steel support needs to be individually bolted, the hole alignment and manual tightening operations need to be performed. This process requires repeated adjustment of the component position and is restricted by the number of bolts, resulting in a significant increase in the time consumption of single-node connection and limited construction efficiency. In addition, the bolt connection only achieves partial fixation of the two adjacent segments, and the locking state of the previous segment cannot be strengthened by the installation of the subsequent segments. It is necessary to rely on manual re-tightening of the bolts at each node to maintain the connection rigidity. Otherwise, the accumulated gaps in multiple segments 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 and are prone to rust, affecting the service life and overall bearing capacity of the steel support. Rusting can easily cause component adhesion, seriously affecting subsequent disassembly operations.

[0005] Therefore, the problems of cumbersome bolt connection between steel support segments, insufficient rigidity after connection, and exposed bolts affecting the overall stability and ease of disassembly and assembly of the support structure are technical problems that need to be solved by technical personnel in this field. Summary of the Invention

[0006] In view of the above problems, an embodiment of the present invention provides a reinforcement structure for foundation pit earthwork excavation construction to solve the above-mentioned technical problems.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides the following technical solution: An embodiment of the present invention provides a reinforcement structure for foundation pit earth and stone excavation construction, including a cofferdam and a purlin, and brackets are evenly fixedly installed on the front and rear sides of the purlin; a steel support is commonly provided on the two front and rear opposite brackets.

[0008] The steel support includes a movable head consisting of a movable section and a fixed section. Multiple sections of steel pipes are installed in sequence on the rear side of the movable section through the connecting part. Except for the last section of the steel pipe, the rear ends of the remaining steel pipes and the rear end of the movable section are provided with tapered columns.

[0009] The connecting part includes a connecting column fixedly installed at the front end of the steel pipe, a conical groove is provided at the front end, and limiting grooves are evenly provided along the circumference of the conical groove. The limiting block is hinged in the limiting groove through a torsion spring rod. Multiple blocks are provided on the conical column, and a push-pull part is provided on the connecting column and the steel pipe.

[0010] The push-pull part includes a plurality of pairs of push-pull rods slidably mounted on the front end of the steel pipe and corresponding to the limit blocks. The front ends of the push-pull rods slide through the adjacent connecting columns on the front side.

[0011] When the tapered groove cooperates with the tapered column, the stop block is located in the limit groove to limit the circumferential rotation of the steel pipe, and the limit block squeezes the tapered column and the stop block to form an axial limit; the connection is completed with a single plug-in and no bolt tightening is required. When the subsequent steel pipe is installed, the front end of its connecting column fits into the rear end of the previous steel pipe, limiting the movement of the push-pull rod so that the limit block remains squeezed, forming a chain constraint between the segments.

[0012] As a preferred solution, the push-pull part also includes a connecting seat fixedly mounted on the torsion spring rod, each pair of push-pull rods is symmetrical about the corresponding connecting seat, and the connecting column is provided with slots corresponding to the connecting seats one by one, and the slots are connected to the limit groove and the conical groove, and the connecting seat and the corresponding limit block form a V-shaped structure with the opening facing the axis of the corresponding conical groove.

[0013] As a preferred solution, the push-pull rod is provided with a driving member for driving the connecting seat to rotate. The driving member includes a driving plate fixedly mounted on the front end of the push-pull rod, a waist groove is opened on the driving plate, and a roller shaft sliding through the corresponding waist groove is fixedly mounted on the connecting seat.

[0014] As a preferred solution, the rear ends of the steel pipes are provided with annular grooves, and the rear ends of the push-pull rods pass through the corresponding steel pipes into the annular grooves and are fixedly installed with fixed rings, which are movably matched with the annular grooves.

[0015] As a preferred solution, four rectangularly arranged limiting columns are fixedly installed at the front end of the fixed section and the rear end of the last section of the steel pipe, and the limiting columns slide through the corresponding brackets and surrounding purlins.

[0016] As a preferred solution, the contact surfaces between the steel pipes and the contact surfaces between the steel pipes and the movable head are provided with rubber pads; the connecting column is provided with mounting holes that correspond one to one with the torsion spring rods and pass 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 solution, the rear end of the steel pipe is evenly provided with disassembly grooves along its circumference, which are connected with the corresponding annular grooves.

[0018] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: First, the present invention completes the circumferential constraint of the steel pipe through the plug-in self-locking mechanism of the tapered column and the tapered groove during the sliding process of the stop block along the limit groove, and pushes the limit block to twist and reset to squeeze the tapered column to form axial locking. A single plug-in replaces the hole alignment and manual tightening of the bolts, which significantly improves the construction efficiency; at the same time, when the subsequent steel pipe is installed, the front end of its connecting column fits into the rear end of the preceding steel pipe, and the displacement of the push-pull rod is limited by physical obstruction, forcing the limit block to continuously squeeze the tapered column to form a multi-segment chain constraint; and the limit block, torsion spring rod and stop block are all built into the closed cavity of the connecting column, combined with the seal formed by the fitting of the steel pipe end faces, doubly isolate the humid environment of the foundation pit, and ensure the bearing capacity and disassembly.

[0019] 2. The present invention instantly limits the circumferential rotation of the steel pipe by embedding the stop block into the limit groove, and at the same time automatically resets and locks the conical column after pushing the limit block to rotate. Axial and circumferential fixation is completed in a single action, eliminating the bolt insertion and alignment processes; the subsequent steel pipe is fitted with the previous steel pipe through the end face to force the push-pull rod to limit its retreat to maintain a constant pressure state of the limit block on the conical column, without the need for manual re-tightening.

[0020] 3. The present invention completely seals the limit block, torsion spring rod and stop block in the connecting column cavity through a built-in closed structure, preventing rainwater from contacting the connecting parts; the end faces of the steel pipe are fitted to further form an auxiliary sealing interface, and there is no relative friction between the statically extruded conical column and the limit block, avoiding rust and adhesion; when disassembling, the rear pull ring drives the push-pull rod to move backward, and the limit block is rotated out of the conical 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 present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

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

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

[0025] Figure 3 It is a structural schematic diagram of the disassembly groove of the present invention.

[0026] Figure 4 It is a partial structural cross-sectional view of the push-pull portion of the present invention.

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

[0028] Figure 6 It is a structural schematic diagram of the tapered groove of the present invention.

[0029] Figure numerals: 1. cofferdam; 2. purlin; 3. bracket; 4. steel support; 40. movable head; 400. movable section; 401. fixed section; 41. steel pipe; 42. conical column; 43. connecting part; 430. connecting column; 431. conical groove; 432. torsion spring rod; 433. limit block; 434. stop block; 5. push-pull part; 50. push-pull rod; 51. connecting seat; 52. driving plate; 53. roller shaft; 54. fixing ring; 540. disassembly groove; 55. limit column. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1 and Figure 2 As shown, a reinforcement structure for foundation pit excavation construction includes a cofferdam 1 and a purlin 2. L-shaped brackets 3 are evenly fixed to the front and rear opposing sides of the purlin 2. Both the cofferdam 1 and the purlin 2 are prior art and are not part of the present invention, so they will not be described in detail here. Steel supports 4 are provided on the two opposing brackets 3.

[0032] like Figure 1 、 Figure 2 and Figure 3As shown, the steel support 4 includes an active head 40 consisting of a rear movable section 400 and a front fixed section 401. A plurality of steel pipes 41 are sequentially installed on the rear side of the movable section 400 through a connecting portion 43. Except for the last section of the steel pipe 41, the rear ends of the remaining steel pipes 41 and the rear end of the movable section 400 are provided with a tapered column 42.

[0033] like Figure 1 、 Figure 3 、 Figure 4 and Figure 5 As shown, the connecting portion 43 includes a connecting column 430 fixedly mounted on the front end of the steel pipe 41, a conical groove 431 is provided at the front end thereof, and limiting grooves are evenly provided along the circumference of the conical groove 431, the limiting grooves are connected to the corresponding conical grooves 431, and a limiting block 433 is hingedly connected to the limiting groove through a torsion spring rod 432. A stopper 434 corresponding to the limiting groove is fixedly mounted on the conical column 42, and the stopper 434 is slidably matched with the corresponding limiting groove. A push-pull portion 5 is provided on the connecting column 430 and the steel pipe 41.

[0034] like Figure 4 and Figure 5 As shown, the push-pull portion 5 includes multiple pairs of push-pull rods 50 slidably mounted on the front end of the steel pipe 41 and corresponding to the limit blocks 433 . The front ends of the push-pull rods 50 slide through the adjacent connecting columns 430 on the front side.

[0035] like Figure 3 and Figure 4 As shown, the rear ends of the steel pipes 41 are each provided with an annular groove, and the rear ends of the push-pull rods 50 pass through the corresponding steel pipes 41 into the annular grooves and are then fixedly mounted with fixing rings 54 movably fitted in the annular grooves.

[0036] like Figures 1 to 5As shown, during the specific operation, the steel pipe 41 and the movable head 40 are hoisted into the cofferdam 1 by an external crane, and then the steel pipe 41 is installed in sequence on the rear side of the movable section 400 of the movable head 40, so that the tapered groove 431 of the connecting column 430 on the steel pipe 41 cooperates with the tapered column 42 on the movable head 40, and as the tapered column 42 is inserted into the tapered groove 431, the stopper 434 slides in the limit groove and pushes the limit block 433 to rotate to the side away from the axis of the tapered groove 431, and at the same time twists the torsion spring rod 432. After the stopper 434 moves to the rear side of the limit block 433, the limit block 433 is reset to squeeze the tapered column 42 under the action of the torsion spring rod 432, and at the same time, the limit block 433 is moved back The end contacts the front end of the corresponding stop block 434. At this time, the fixing ring 54 is located in the corresponding ring groove, and the subsequent steel pipes 41 are installed in the same way. The conical groove 431 of the connecting column 430 on the next steel pipe 41 cooperates with the conical column 42 on the previous steel pipe 41, and the front end face of the connecting column 430 of the steel pipe 41 fits with the rear end face of the previous steel pipe 41 and the corresponding fixing ring 54 to limit the movement of the push-pull rod 50. The limit block 433 maintains the extrusion limit on the conical column 42 to form a chain constraint between the segments. Continue to install the steel pipe 41 in this way until the steel support 4 of the required length is installed. The crane then hoists the steel support 4 onto the two opposite brackets 3 on the purlin 2.

[0037] like Figure 4 、 Figure 5 and Figure 6 As shown, the push-pull part 5 also includes a connecting seat 51 fixedly mounted on the torsion spring rod 432, each pair of push-pull rods 50 is symmetrical about the corresponding connecting seat 51, and the connecting column 430 is provided with a slot corresponding to the connecting seat 51 one by one, and the slot is connected to the limiting groove and the conical groove 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 conical groove 431.

[0038] like Figure 4 、 Figure 5 and Figure 6 As shown, the push-pull rod 50 is provided with a driving member for driving the connecting seat 51 to rotate. The driving member includes a driving plate 52 fixedly installed at the front end of the push-pull rod 50. A waist groove is opened on the driving plate 52, and a roller shaft 53 sliding through the corresponding waist groove is fixedly installed on the connecting seat 51.

[0039] like Figure 3 and Figure 4 As shown, the rear end of the steel pipe 41 is evenly provided with disassembly grooves 540 along its circumference, which are connected with the corresponding annular grooves. The disassembly grooves 540 provide operating space for the prying tool, making it convenient to pull the fixing ring 54 out of the annular groove.

[0040] like Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, four rectangularly arranged limiting columns 55 are fixedly installed on the front end of the fixed section 401 and the rear end of the last section of the steel pipe 41 , and the limiting columns 55 slide through the corresponding brackets 3 and surrounding purlins 2 .

[0041] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, the contact surfaces of the steel pipes 41 and the contact surfaces of the steel pipes 41 and the movable head 40 are both provided with rubber pads; the connecting column 430 is provided with mounting holes that correspond one-to-one to the torsion spring rods 432 and pass through the connecting column 430 at both ends, the torsion spring rods 432 are rotatably installed in the mounting holes, and rubber plugs are embedded in the two ends of the mounting holes.

[0042] like Figures 1 to 6 As shown, during the specific operation, the crane hoists the steel support 4 onto the two opposite brackets 3 of the purlin 2, and the limiting column 55 on the last section of the steel pipe 41 passes through the corresponding bracket 3 and the purlin 2, and moves the fixed section 401 of the movable head 40 so that the limiting column 55 on the fixed section 401 passes through the corresponding bracket 3 and the purlin 2; then the hydraulic jack is horizontally embedded in the reserved gap between the fixed section 401 and the movable section 400 of the movable head 40, and the base of the hydraulic jack is fixed on the fixed section 401 of the movable head 40 on the side of the purlin 2, and the piston push rod pushes the movable section 400 of the movable head 40 and the steel pipe 41 Move to eliminate the initial gap of the support system, so that the steel support 4 is transformed from a loose state into a rigid whole that tightly supports the enclosure structure; and simultaneously insert the steel wedge block between the movable section 400 and the fixed section 401 to complete the mechanical locking, converting the hydraulic thrust into permanent prestressing, and then the hydraulic jack piston rod is retracted and reset, and the hydraulic jack is horizontally slid out of the gap of the movable head 40. At this time, the steel wedge block bears all the axial force, and rubber pads are provided at each node connection and rubber plugs are installed at the torsion spring rod 432 position to improve the overall sealing and further prevent the rust of the internal connector of the tapered groove 431.

[0043] When disassembly is required, the hydraulic jack is first reinstalled between the fixed section 401 and the movable section 400 of the joint 40, with the piston push rod contacting the movable section 400 of the joint 40, allowing it to promptly take over the full load of the steel support 4. The steel wedge is then hammered to release the locking device from the stressed state, allowing the jack to take over the full load. The hydraulic jack piston push rod is then slowly retracted, and the hydraulic jack is removed. The limit posts 55 on the fixed section 401 are then removed from the corresponding brackets 3 and purlins 2, allowing the steel support 4 to be lifted off the purlins 2 and placed on the ground for disassembly.

[0044] During disassembly, an axial pulling force is applied to the fixing ring 54 by inserting a pry tool into the disassembly groove 540. The fixing ring 54 drives all the push-pull rods 50 connected to it to move backward. The push-pull rod 50 drives the connecting block to rotate through the waist groove on the drive plate 52 and the cooperation with the roller shaft 53. The connecting block drives the limit block 433 to rotate away from the tapered column 42 and the corresponding stop block 434 through the torsion spring rod 432. At this time, the torsion spring rod 432 is twisted; then keep pulling the fixing ring 54, and then pull the last section of the steel pipe 41 backward to separate from the adjacent steel pipe 41, and then release the fixing ring 54. The limit block 433 rotates and resets under the action of the torsion spring rod 432 to prepare for the next assembly limit. The rapid disassembly of the remaining steel pipes 41 can be completed according to this operation sequence.

[0045] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0046] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature designated as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reinforcement structure for foundation pit excavation construction, comprising a cofferdam and a cofferdam purlin, wherein brackets are evenly fixedly mounted on opposite sides of the cofferdam purlin; characterized in that: The two brackets facing each other are provided with steel supports; The steel support includes a movable head consisting of a movable section and a fixed section. The rear side of the movable section is equipped with multiple sections of steel pipes through the connecting part. Except for the last section of the steel pipe, the rear ends of the remaining steel pipes and the rear end of the movable section are equipped with tapered columns. The connecting part includes a connecting column fixedly mounted on the front end of the steel pipe, a tapered groove is provided at the front end, and limit grooves are evenly provided in the tapered groove along its circumference. A limit block is hinged in the limit groove through a torsion spring rod, and a plurality of blocks are provided on the tapered column. A push-pull part is provided on the connecting column and the steel pipe. The push-pull part includes a plurality of pairs of push-pull rods slidably mounted on the front end of the steel pipe and corresponding to the limit blocks, and the front ends of the push-pull rods slide through the adjacent connecting columns on the front side; When the tapered groove and the tapered column are matched, the stop block is located in the limit groove to limit the circumferential rotation of the steel pipe, and the limit block squeezes the tapered column and the stop block to form an axial limit; no bolts are required for tightening. When the subsequent steel pipe is installed, the front end of its connecting column fits into the rear end of the preceding steel pipe, limiting the movement of the push-pull rod and forcing the limit block to remain in a locked state, forming a built-in closed anti-corrosion chain constraint between the steel pipe segments.

2. A reinforcement structure for foundation pit earthwork excavation construction according to claim 1, characterized in that: The push-pull part also includes a connecting seat fixedly mounted on the torsion spring rod, each pair of push-pull rods is symmetrical about the corresponding connecting seat, and a notch corresponding to the connecting seat is opened on the connecting column, and the notch is connected to the limit groove and the conical groove. The connecting seat and the corresponding limit block form a V-shaped structure with the opening facing the axis of the corresponding conical groove.

3. A reinforcement structure for foundation pit earthwork excavation construction according to claim 2, characterized in that: The push-pull rod is provided with a driving member for driving the connecting seat to rotate. The driving member includes a driving plate fixedly mounted on the front end of the push-pull rod, a waist groove is opened on the driving plate, and a roller shaft sliding through the corresponding waist groove is fixedly mounted on the connecting seat.

4. The reinforcement structure for foundation pit earthwork excavation construction according to claim 1, characterized in that: The rear ends of the steel pipes are each provided with an annular groove. The rear ends of the push-pull rods pass through the corresponding steel pipes into the annular grooves and are then fixedly installed with a fixing ring. The fixing ring and the annular groove are movably matched.

5. The reinforcement structure for foundation pit earthwork excavation construction according to claim 1, characterized in that: Four rectangularly arranged limit columns are fixedly installed at the front end of the fixed section and the rear end of the last section of the steel pipe. The limit columns slide through the corresponding brackets and surrounding purlins.

6. The reinforcement structure for foundation pit earthwork excavation construction according to claim 1, characterized in that: The contact surfaces between the steel pipes and the contact surfaces between the steel pipes and the movable head are both provided with rubber pads; the connecting column is provided with mounting holes that correspond one to one with the torsion spring rods and pass 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.

7. The reinforcement structure for foundation pit earthwork excavation construction according to claim 4, characterized in that: The rear end of the steel pipe is evenly provided with disassembly grooves connected with the corresponding annular grooves along its circumference.

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