A bottom-up excavation foundation assembly type retaining wall construction method

Abstract

The present application relates to a kind of from bottom to top hole foundation assembly type retaining wall construction method, comprising the following steps: S1, excavate first section retaining wall earthwork;S2, install first section retaining wall and retaining wall chuck and the two are assembled together;S3, erect assembly type retaining wall construction equipment, the 3 hoisting points of first section retaining wall are docked with the 3 hoisting lines of the 3 electric winches of assembly type retaining wall construction equipment;S4, excavate second section retaining wall earthwork;S5, install second section retaining wall in the upper portion of first section retaining wall and connect together;S6, first section retaining wall and retaining wall chuck are disassembled;Start assembly type retaining wall construction equipment, release hoisting line, so that first section retaining wall and second section retaining wall overall settlement;S7, after first settlement is completed, retaining wall chuck and second section retaining wall are assembled together;S8, the method of steps S4-S7 is repeated to carry out cyclic operation, until all retaining wall is installed in place.The method can effectively reduce construction difficulty and operation risk, improve construction efficiency, improve construction quality.

Description

Technical Field

[0001] This invention relates to the field of retaining wall construction technology, specifically to a bottom-up prefabricated retaining wall construction method for excavated foundations. Background Technology

[0002] Current retaining wall construction techniques involve manually or mechanically excavating the hole to a certain depth, then erecting formwork, pouring concrete, curing it to the required strength, and then continuing to excavate, erect formwork, and cure. This process, where formwork is erected and concrete is poured in place at the bottom of the pit, presents difficulties for workers, results in poor retaining wall forming accuracy, and complicates concrete curing, making it hard to guarantee project quality. Each section must solidify before the next can be laid, leading to a long construction cycle. Furthermore, if the cast-in-place concrete retaining wall is not properly cured or the curing time is insufficient, it is prone to collapse as the excavation depth increases, posing a high risk to construction workers. Summary of the Invention

[0003] The purpose of this invention is to provide a bottom-up prefabricated retaining wall construction method for bored foundations, which can effectively reduce construction difficulty and operational risks, improve construction efficiency, and enhance construction quality.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a bottom-up prefabricated retaining wall construction method for bored foundations, comprising the following steps:

[0005] S1. Excavate the first section of retaining wall earthwork to the designed diameter and depth;

[0006] S2. Install the first section of the retaining wall, then install the retaining wall chuck and assemble it with the first section of the retaining wall;

[0007] S3. Set up the prefabricated retaining wall construction equipment, which includes 3 electric winches. Then, connect the 3 lifting points of the assembled first section of retaining wall to the 3 lifting lines of the 3 electric winches and tighten the lifting lines. At this time, the weight of the first section of retaining wall is supported by the 3 lifting lines of the 3 electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck.

[0008] S4. Excavate the second section of the retaining wall to the designed diameter and depth;

[0009] S5. Install the second section of the retaining wall on the upper part of the first section of the retaining wall and connect the two together with a retaining ring. At this time, the weight of the first section of the retaining wall and the second section of the retaining wall are supported by the three suspension lines of the three electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck.

[0010] S6. Disassemble the first section of the retaining wall from the retaining wall chuck. At this time, the weight of the first and second sections of the retaining wall is borne by the three suspension lines of the three electric winches of the prefabricated retaining wall construction equipment. Then start the three electric winches of the prefabricated retaining wall construction equipment, release the suspension lines, and let the first and second sections of the retaining wall settle as a whole.

[0011] S7. After the first settlement is completed, the first section of the retaining wall sinks to the bottom of the pit, and the second section of the retaining wall is in the original position of the first section of the retaining wall at the pit opening; the retaining wall chuck is assembled with the second section of the retaining wall; at this time, the weight of the first and second sections of the retaining wall is supported by the three hoisting lines of the three electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck.

[0012] S8. Following the methods in steps S4-S7, repeat the process of excavating the retaining wall, installing the retaining wall, removing the retaining wall, allowing the retaining wall to settle as a whole, and reinstalling the retaining wall chuck, and carry out the cycle operation until all the retaining walls are installed in place.

[0013] Furthermore, each section of the retaining wall comprises three retaining wall plates, which are connected by bolts.

[0014] Furthermore, during the cyclic operation, every two sections of the retaining wall are evenly driven into the reserved holes on one section as a second safety positioning in addition to the retaining wall chuck and the hoisting line of the prefabricated retaining wall construction equipment.

[0015] Furthermore, the prefabricated retaining wall construction equipment is equipped with a tension sensor for detecting the tension of the suspension lines. Based on the tension of the three suspension lines collected by the tension sensor, the prefabricated retaining wall construction equipment continuously adjusts the lifting of one or two suspension points during the hoisting process to balance the tension of the three suspension lines, thereby ensuring that the retaining wall assembled into a whole remains vertical.

[0016] Furthermore, the retaining wall chuck includes an annular chuck and a plurality of telescopic pins disposed on the inner side of the annular chuck and capable of radial movement. The telescopic pins are inserted into the reserved holes of the assembled retaining wall and support it.

[0017] Furthermore, the inner side of the annular chuck is provided with a guide groove for accommodating the telescopic pin, the bottom surface of the guide groove is provided with a guide rail for sliding cooperation with the telescopic pin, and the inner side of the guide groove is symmetrically provided with limit pulleys.

[0018] Furthermore, the telescopic pin has a toothed groove at its top, and the annular chuck has a mounting groove on its surface. The mounting groove contains a rotating gear that meshes with the toothed groove to drive the telescopic pin to move radially.

[0019] Furthermore, the inner side of the guide groove is connected to the limiting pulley via a limiting rod.

[0020] Furthermore, the annular chuck is composed of multiple arc-shaped chucks spliced ​​together to form an annular shape, with adjacent arc-shaped chucks fixed together by connecting bolts. Each arc-shaped chuck includes an outer arc-shaped support, an inner arc-shaped support, and a connecting support for connecting the inner and outer arc-shaped supports.

[0021] Furthermore, the bottom of the annular chuck is provided with multiple reinforcing square steel bars, each of which corresponds to the position below the telescopic pin.

[0022] Compared with existing technologies, the present invention has the following beneficial effects: The present invention provides a bottom-up prefabricated retaining wall construction method for bored foundations. This method assembles the retaining wall on the ground at the pit opening and then settles it as a whole. Compared with the method of casting concrete at the bottom of the pit, this method is not only simpler and easier to operate, greatly reducing construction difficulty, but also significantly improving the dimensional and positional accuracy of the retaining wall. It also eliminates potential quality problems caused by inadequate concrete curing or insufficient setting time. Simultaneously, since the entire weight of the retaining wall is supported by the prefabricated retaining wall construction equipment and retaining wall chucks during construction, it eliminates the risk of collapse and worker safety issues. Furthermore, this method only requires simple retaining wall assembly, chuck pin fixation, mechanized overall settlement, chuck pin removal, retaining wall reassembly and reassembly, chuck pin refixation, and mechanized overall settlement, repeating this cycle to complete the retaining wall construction within the excavated borehole diameter, thus greatly increasing construction speed. Therefore, the present invention has strong practicality and broad application prospects. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the method implementation of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the wall-mounted chuck in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation structure of the wall-mounted chuck in an embodiment of the present invention;

[0026] Figure 4 yes Figure 2 A partial schematic diagram of point A in the middle;

[0027] Figure 5 This is a schematic diagram of the internal structure of the guide groove in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the engagement between the rotating gear and the tooth groove in an embodiment of the present invention;

[0029] In the diagram: 1-ring chuck, 11-guide groove, 12-installation groove, 13-arc chuck, 131-outer arc support, 132-inner arc support, 133-connecting support, 14-guide rail, 2-telescopic pin, 3-limiting pulley, 4-limiting rod, 5-toothed groove, 6-rotating gear, 7-connecting bolt, 8-reinforcing square steel, 9-ring reinforcing plate, 10-assembled protective wall, 20-pre-drilled hole. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] like Figure 1 As shown, this embodiment provides a bottom-up prefabricated retaining wall construction method for bored foundations, including the following steps:

[0034] S1. Excavate the first section of retaining wall soil to the designed diameter and depth.

[0035] First excavate the central section, then expand to the perimeter, paying close attention to keeping the cross-sectional dimensions within the design range throughout the excavation process. After excavation, the pit depth should ensure that the first section of the retaining wall is 200-300mm above the ground.

[0036] S2. Install the first section of the retaining wall, then install the retaining wall chuck and assemble it with the first section of the retaining wall.

[0037] Each section of the retaining wall consists of three retaining wall panels, which are connected by special bolts.

[0038] During the installation of the first section of the retaining wall, check the foundation axis and elevation. The deviation between the center line of the well ring retaining wall and the design axis shall not exceed 20mm.

[0039] When installing the retaining wall chuck, first level the soil around the pit opening, then assemble the steel retaining wall chuck. After installation, the chuck should be concentric with the retaining wall ring.

[0040] S3. Set up the prefabricated retaining wall construction equipment, which includes three electric winches. Then, connect the three lifting points of the assembled first retaining wall section to the three lifting lines of the three electric winches and tighten the lifting lines. At this time, the weight of the first retaining wall section is supported simultaneously by the three lifting lines of the three electric winches and the retaining wall chuck of the prefabricated retaining wall construction equipment.

[0041] S4. Excavate the second section of the retaining wall to the designed diameter and depth.

[0042] Since the weight of the first section of the retaining wall was simultaneously supported by the three hoisting lines of the three electric winches and the retaining wall chuck of the prefabricated retaining wall construction equipment, the construction safety was guaranteed during the excavation of the second section of the retaining wall.

[0043] S5. Install the second retaining wall section on top of the first retaining wall section. After the second retaining wall section is assembled, reliably connect it to the first retaining wall section using a special U-shaped retaining ring. At this time, the weight of the first and second retaining wall sections is simultaneously supported by the three suspension lines of the three electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck.

[0044] S6. Disconnect the first section of the retaining wall from the retaining wall chuck, i.e., loosen the pin on the retaining wall chuck and pull the pin out of the pre-drilled hole in the retaining wall. At this point, the weight of the first and second sections of the retaining wall is supported by the three suspension lines of the three electric winches of the prefabricated retaining wall construction equipment. Then, start the three electric winches of the prefabricated retaining wall construction equipment, release the suspension lines, and allow the first and second sections of the retaining wall to settle as a whole.

[0045] During the settling process, ensure that the speed of the three electric winches is balanced and that the settling is smooth. Check the foundation axis and elevation to ensure that the deviation between the center line of the well ring wall and the design axis does not exceed 20mm.

[0046] S7. After the first settlement is completed, the first section of the retaining wall sinks to the bottom of the pit, and the second section of the retaining wall is in the original position of the first section of the retaining wall at the pit opening. At this time, the retaining wall chuck is assembled with the second section of the retaining wall. At this time, the weight of the first and second sections of the retaining wall is supported by the three hoisting lines of the three electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck.

[0047] S8. Following the methods in steps S4-S7, repeat the process of excavating the retaining wall, installing the retaining wall, removing the retaining wall, allowing the retaining wall to settle as a whole, and reinstalling the retaining wall chuck. Continue this cyclical operation until all the retaining walls are installed and assembled into a whole.

[0048] During the cyclic operation, every two sections of the retaining wall are driven into the reserved holes on one section of the retaining wall as a safety positioning method, in addition to the retaining wall chuck and the hoisting line of the prefabricated retaining wall construction equipment.

[0049] Finally, the retaining wall clamps are removed and retracted. The entire retaining wall construction is now complete.

[0050] This method employs a prefabricated retaining wall precision hoisting technology. The prefabricated retaining wall construction equipment is equipped with tension sensors to detect the tension of the hoisting lines. Based on the tension of the three hoisting lines collected by the sensors, the equipment continuously adjusts the lifting of one or two hoisting points during the hoisting process to balance the tension of the three lines, thus ensuring the assembled retaining wall remains vertical. Furthermore, the hoisting height for each prefabricated retaining wall section is designed based on its height and the configuration of the installation joints. Using sensor data acquisition and camera status monitoring, the installation position, height, and center position deviation of the retaining wall are monitored in real time, intelligently sensed, and adjusted in real time through PLC and mechatronics technology.

[0051] like Figure 2-6 As shown, in this embodiment, a retaining wall chuck structure is also provided for the above-mentioned prefabricated retaining wall construction method for bored foundations. The retaining wall chuck includes an annular chuck 1 and a plurality of radially movable telescopic pins 2 disposed on the inner side of the annular chuck. The telescopic pins are inserted into the reserved holes 20 of the prefabricated retaining wall 10 and support them.

[0052] In this embodiment, the inner side of the annular chuck is provided with a guide groove 11 for accommodating the telescopic pin, the bottom surface of the guide groove is provided with a guide rail 14 for sliding cooperation with the telescopic pin, and the inner side of the guide groove is symmetrically provided with limiting pulleys 3; the inner side of the guide groove and the limiting pulleys are connected by a limiting rod 4.

[0053] By setting limit rods and limit pulleys, the telescopic pin can be extended and retracted radially along the annular chuck, and the two sides of the telescopic pin can be limited to prevent deviation.

[0054] In this embodiment, the top of the telescopic pin is provided with a toothed groove 5, the surface of the chuck is provided with a mounting groove 12, and the mounting groove is provided with a rotating gear 6 for meshing with the toothed groove; by controlling the rotation of the rotating gear, the telescopic pin is driven to move radially through the toothed groove.

[0055] The aforementioned toothed groove is a rack.

[0056] In this embodiment, the annular chuck 1 is formed by splicing multiple arc-shaped chucks 13 to form an annular shape. Adjacent arc-shaped chucks are fixed together by connecting bolts 7. Each arc-shaped chuck includes an outer arc-shaped support 131, an inner arc-shaped support 132, and a connecting support 133 for connecting the inner and outer arc-shaped supports.

[0057] In this embodiment, in order to improve the strength of the annular chuck, a plurality of reinforcing square steel bars 8 are provided at the bottom of the annular chuck, each reinforcing square steel bar corresponding to the position below the telescopic pin.

[0058] In this embodiment, the lower surface of the annular chuck may also be provided with an annular reinforcing plate 9, and the reinforcing square steel is located below the annular reinforcing plate.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A bottom-up prefabricated retaining wall construction method for bored foundations, characterized in that, Includes the following steps: S1. Excavate the first section of retaining wall earthwork to the designed diameter and depth; S2. Install the first section of the retaining wall, then install the retaining wall chuck and assemble it with the first section of the retaining wall; S3. Set up the prefabricated retaining wall construction equipment, which includes 3 electric winches. Then, connect the 3 lifting points of the assembled first section of retaining wall to the 3 lifting lines of the 3 electric winches and tighten the lifting lines. At this time, the weight of the first section of retaining wall is supported by the 3 lifting lines of the 3 electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck. S4. Excavate the second section of the retaining wall to the designed diameter and depth; S5. Install the second section of the retaining wall on the upper part of the first section of the retaining wall and connect the two together with a retaining ring. At this time, the weight of the first section of the retaining wall and the second section of the retaining wall are supported by the three suspension lines of the three electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck. S6. Disassemble the first section of the retaining wall from the retaining wall chuck. At this time, the weight of the first and second sections of the retaining wall is borne by the three suspension lines of the three electric winches of the prefabricated retaining wall construction equipment. Then start the three electric winches of the prefabricated retaining wall construction equipment, release the suspension lines, and let the first and second sections of the retaining wall settle as a whole. S7. After the first settlement is completed, the first section of the retaining wall sinks to the bottom of the pit, and the second section of the retaining wall is in the original position of the first section of the retaining wall at the pit opening; the retaining wall chuck is assembled with the second section of the retaining wall; at this time, the weight of the first and second sections of the retaining wall is supported by the three hoisting lines of the three electric winches of the prefabricated retaining wall construction equipment and the retaining wall chuck. S8. Following the methods of steps S4-S7, repeat the excavation of the retaining wall soil, installation of the retaining wall, removal of the retaining wall, overall settlement of the retaining wall, and reinstallation of the retaining wall chuck, and carry out cyclical operations until all the retaining walls are installed in place. The retaining wall chuck includes an annular chuck and multiple radially movable telescopic pins disposed on the inner side of the annular chuck. The telescopic pins are inserted into and supported in pre-drilled holes in the assembled retaining wall. The inner side of the annular chuck is provided with a guide groove for accommodating the telescopic pins. The bottom surface of the guide groove is provided with a guide rail for sliding engagement with the telescopic pins. Limiting pulleys are symmetrically arranged on the inner side of the guide groove. The top of the telescopic pin is provided with a toothed groove. The surface of the annular chuck is provided with a mounting groove. A rotating gear is provided in the mounting groove for meshing with the toothed groove to drive the telescopic pins to move radially. The inner side of the guide groove is connected to the limiting pulleys via a limiting rod.

2. The bottom-up prefabricated retaining wall construction method for bored foundations according to claim 1, characterized in that, Each section of the retaining wall consists of three retaining wall panels, which are connected by bolts.

3. The method for constructing a prefabricated retaining wall for a bottom-up excavated foundation according to claim 1, characterized in that, During the cyclic operation, every two sections of the retaining wall are driven into the reserved holes on one section of the retaining wall as a safety positioning method, in addition to the retaining wall chuck and the hoisting line of the prefabricated retaining wall construction equipment.

4. The bottom-up prefabricated retaining wall construction method for bored foundations according to claim 1, characterized in that, The prefabricated retaining wall construction equipment is equipped with a tension sensor for detecting the tension of the suspension lines. Based on the tension of the three suspension lines collected by the tension sensor, the prefabricated retaining wall construction equipment continuously adjusts the lifting of one or two suspension points during the hoisting process to balance the tension of the three suspension lines, thereby ensuring that the assembled retaining wall remains vertical at all times.

5. The method for constructing a prefabricated retaining wall for a bottom-up excavated foundation according to claim 1, characterized in that, The annular chuck is composed of multiple arc-shaped chucks joined together to form a ring. Adjacent arc-shaped chucks are fixed together by connecting bolts. Each arc-shaped chuck includes an outer arc-shaped support, an inner arc-shaped support, and a connecting support for connecting the inner and outer arc-shaped supports.

6. The method for constructing a prefabricated retaining wall for a bottom-up excavated foundation according to claim 1, characterized in that, The bottom of the annular chuck is provided with multiple reinforcing square steel bars, each of which corresponds to the position below the telescopic pin.

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