Reverse construction side wall steel bar reserving and fixing device and construction method

Abstract

The invention discloses a reverse construction side wall steel bar reserving and fixing device and a construction method, and belongs to the technical field of underground engineering construction. The device mainly comprises a bottom plate, a middle partition plate perpendicularly fixed to the bottom plate, a longitudinal outer plate, a longitudinal inner plate and a top inclined plate, wherein the longitudinal outer plate and the longitudinal inner plate are symmetrically arranged on the two sides of the middle partition plate; open holes for side wall steel bars to penetrate through are formed in the top inclined plate at designed intervals. During construction, the device is firstly machined on the pedestal, and a hole is formed in the pedestal; then, in the reverse construction process, the device is arranged at the designed position of the side wall, and positioning steel bars are driven in for limiting and fixing; inserting the side wall reinforcing steel bar with the sleeve into the open hole, and blocking the hole by using foam glue; and finally, concrete is poured, and the device is dismantled for recycling after forming. The method solves the problems of non-uniform steel bar spacing, easy corrosion of the sleeve, concrete settlement and the like caused by a traditional sand filling process, and has the advantages of high construction quality, high efficiency, low cost and recyclability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground engineering construction, and particularly relates to a reverse construction method construction side wall reinforcement reservation fixing device and a construction method. BACKGROUND

[0002] With the rapid development of urban rail transit and underground space development, deep foundation pit projects such as subway stations located in urban central areas are increasing. These projects generally face severe challenges such as complex surrounding environment, dense buildings, numerous underground pipelines, high environmental protection requirements, heavy traffic relief pressure, and small construction site. Under this background, the reverse construction method is more and more widely used because it can use the structure itself as support, significantly reduce the deformation of the enclosure structure, has little impact on the surrounding environment, and has high environmental safety.

[0003] However, the construction of reverse stations, especially the construction of side walls, still faces many technical problems that have not been completely overcome. In traditional technology, sand is often used as a bottom mold at the bottom of the side wall to fix the reserved reinforcement. This method has obvious drawbacks: first, the flatness of the underground continuous wall is extremely high, otherwise it is difficult to ensure the uniformity of the thickness of the side wall; second, the single-sided formwork system (such as steel truss formwork) is easily deformed under the pressure of concrete, making it difficult to evenly arrange the side wall reinforcement according to the design spacing; third, the sand layer is easily disturbed during concrete pouring, resulting in inaccurate positioning of the reserved reinforcement and difficulty in controlling the thickness of the protective layer; fourth, the steel connecting sleeve embedded in the sand is difficult to protect effectively and is easily corroded by grout, affecting the construction quality and structural safety of subsequent steel connection; fifth, the sand filling process is complicated, the material cannot be recycled, and there is a serious waste of resources, and there is a risk of settlement after concrete pouring.

[0004] In view of the above status, there is an urgent need for a new construction device and method to solve the problems of accurate reservation, fixation and protection of side wall reinforcement in reverse construction, so as to ensure construction quality, improve efficiency and reduce cost. SUMMARY

[0005] The purpose of the present application is to provide a reverse construction method construction side wall reinforcement reservation fixing device and a construction method, which aims to improve construction efficiency, reduce material consumption and engineering cost, and realize energy-saving and environment-friendly green construction.

[0006] The application is implemented by adopting the following technical scheme: a reserved fixing device for side wall steel bars in reverse construction method construction, comprising a bottom plate, an intermediate partition plate, a longitudinal outer plate, a longitudinal inner plate and a top inclined plate; the intermediate partition plate is fixedly connected to the bottom plate; the longitudinal outer plate and the longitudinal inner plate are arranged on the two sides of the intermediate partition plate in parallel, and are fixedly connected to the bottom plate and the intermediate partition plate; the top inclined plate is arranged on the top of the longitudinal outer plate and the longitudinal inner plate in an inclined manner, and is fixedly connected to the two plates and the intermediate partition plate, forming a stable support structure; a plurality of openings for passing through the side wall steel bars are formed in the top inclined plate.

[0007] Further, the longitudinal outer plate, the longitudinal inner plate and the intermediate partition plate are fixedly connected to the bottom plate and the top inclined plate by nails.

[0008] Further, the device further comprises a plurality of positioning steel bars, which are arranged outside the longitudinal outer plate and used for limiting and fixing the whole device.

[0009] Further, the diameter of the opening is greater than the diameter of the side wall steel bar, and the gap between the opening and the inserted side wall steel bar is sealed by foam glue.

[0010] Further, the bottom plate, the longitudinal outer plate, the longitudinal inner plate, the top inclined plate and the intermediate partition plate are made of film-coated plywood material.

[0011] A reserved fixing method for side wall steel bars in reverse construction method construction, comprising the following steps: S1, device processing: according to the design thickness of the side wall and the spacing of the steel bars, the fixing device is processed and prepared, and openings are drilled on the top inclined plate at the designed spacing; S2, node design: when the top inclined plate of the reverse construction station is constructed, the structural nodes of the side wall and the top inclined plate are designed in detail, and the construction joint is processed by the flange reservation method; S3, device installation and positioning: the processed fixing device is placed at the designed position of the bottom of the side wall, the longitudinal inner plate faces the inside of the structure, and then the positioning steel bars are arranged close to the longitudinal outer plate to limit and fix the device; S4, steel bar installation and sealing: the side wall steel bar with a connecting sleeve is inserted into the opening on the top inclined plate, and immediately after insertion, the gap between the steel bar and the opening is sealed by foam glue; S5, concrete pouring: side wall concrete pouring construction is carried out; S6, device removal and recycling: after the concrete reaches the strength, the fixing device is removed, and after cleaning, it is recycled.

[0012] Further, in step S3, the positioning steel bars are arranged at positions corresponding to the positions of the intermediate partition plates in the device.

[0013] The beneficial effects of the reverse construction method construction side wall steel bar reserved fixing device and the construction method include: The device is prefabricated in a factory, and the steel bars are accurately positioned by opening the hole, which completely solves the problems of uneven steel bar spacing and inaccurate protection layer thickness. The device has high rigidity and can effectively resist the lateral pressure during concrete pouring, avoid deformation of the formwork, and ensure uniform thickness of the side wall. At the same time, the method ensures good treatment of the construction joint, improves the overall structure and waterproof performance.

[0014] Foam glue is used to block the pores between the opening and the steel bars, forming a reliable sealing barrier, effectively preventing cement slurry from seeping into the device during pouring, avoiding contamination and corrosion of the steel bar connecting sleeve by cement slurry, and greatly improving the success rate and reliability of mechanical connection.

[0015] The device is made of materials such as laminated plywood, has high integrity, and can be quickly put into the next cycle of use after simple cleaning after removal, with very low material loss, eliminating the waste of one-time materials in traditional sand filling process, and meeting the requirements of green construction and sustainable development.

[0016] The device has a simple structure, convenient processing and installation. The construction process is clear and easy to operate, significantly reducing the on-site operation time and labor input, shortening the construction period, and reducing the construction cost.

[0017] The technical scheme is safe, clean, and pollution emission controllable, and is economical and reliable. It is suitable for construction of side walls of underground structures of different thicknesses and heights, and has a wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained from the structures shown in these drawings without creative labor.

[0019] Fig. 1 It is a downward sectional view of a reverse construction method construction side wall steel bar reserved fixing device. Fig. 2 It is a side view of a reverse construction method construction side wall steel bar reserved fixing device. Fig. 3 It is a schematic view of a reverse construction method construction side wall steel bar reserved fixing device in a construction state. In the figure: 1-bottom plate; 2-longitudinal outer plate; 3-longitudinal inner plate; 4-top inclined plate; 5-opening; 6-intermediate partition plate; 7-positioning steel bar. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application. Embodiment

[0022] As Figs. 1-3 shown, the present embodiment provides a reverse construction method construction side wall reinforcement reserved fixing device. Mainly by the bottom plate 1, longitudinal outer plate 2, longitudinal inner plate 3, top inclined plate 4, opening 5, intermediate partition plate 6, positioning reinforcement 7.

[0023] The bottom plate 1 is a rectangular plate, which is the base of the whole device. The intermediate partition plate 6 is vertically fixed on the center position of the upper surface of the bottom plate 1, and is rigidly connected with the bottom plate 1 by nails. The longitudinal outer plate 2 and the longitudinal inner plate 3 are arranged in parallel on both sides of the intermediate partition plate 6, and are fixedly connected with the bottom plate 1 and the intermediate partition plate 6 by nails respectively, forming a double-wall structure. The top inclined plate 4 is inclinedly arranged at the top of the device, the lower side thereof is connected with the upper edge of the longitudinal outer plate 2, the higher side thereof is connected with the upper edge of the longitudinal inner plate 3, and the top thereof is fixed with the intermediate partition plate 6 by nails, forming a stable triangular support structure.

[0024] A series of openings 5 are arranged on the top inclined plate 4 at designed intervals, the hole diameter of which is slightly larger than the diameter of the side wall reinforcement, which is used for accurately positioning the position of the reinforcement. A row of positioning reinforcements 7 is arranged on the outer side of the longitudinal outer plate 2, the setting interval of which corresponds to the setting position of the intermediate partition plate 6, which is used for limiting and fixing the whole bottom film device.

[0025] The connection parts of the components of the device are all designed to prevent leakage. The pores between the openings 5 of the top inclined plate 4 and the side wall reinforcement are sealed by foam glue, so as to prevent the cement slurry from seeping into the inside of the device during concrete pouring, which causes the rusting of the reinforcement sleeve. The whole device is made of laminated plywood material, which has sufficient rigidity and durability, and can be used repeatedly. Embodiment

[0026] The present embodiment provides a construction method of a reverse construction method construction side wall reinforcement reserved fixing method, which specifically comprises the following steps: First, the processing and manufacturing of the bottom membrane device are carried out: on the site pedestal, according to the design thickness of the side wall and the spacing of the steel bars, accurate blanking is carried out. First, the bottom plate 1 is processed, then the middle partition plate 6 is vertically connected with the bottom plate 1, then the longitudinal outer plate 2 and the longitudinal inner plate 3 are sequentially fixed with the bottom plate 1 and the middle partition plate 6 by means of nails, and finally the top inclined plate 4 is installed, so that it is reliably connected with the longitudinal outer plate 2, the longitudinal inner plate 3 and the middle partition plate 6 respectively.

[0027] After the device is assembled, the positioning is carried out by using the ink line, and the drilling machine is used to process the hole 5 on the top inclined plate 4 according to the designed spacing. The diameter of the hole needs to consider the diameter of the steel bar and the construction error, so as to ensure that the steel bar can be smoothly inserted and the gap is controllable.

[0028] During the construction stage of the top inclined plate of the reverse construction station, the detailed design of the structure node of the side wall and the top inclined plate is carried out, the side wall construction joint is handled by means of the leftover reserved method, and the tightness and waterproof performance of the subsequent construction joint are ensured.

[0029] When installing, the processed bottom membrane device is placed at the designed position of the side wall bottom, so that the longitudinal inner plate 3 faces the inner side of the structure, and the longitudinal outer plate 2 faces the outer side of the structure. A row of positioning steel bars 7 is punched close to the longitudinal outer plate 2, and the spacing is corresponding to the position of the middle partition plate 6, so as to realize the accurate limiting and fixing of the bottom membrane device by means of the positioning steel bars 7.

[0030] During the construction of the side wall steel bars, the reserved section steel bars are connected with the sleeves, and then are accurately inserted into the hole 5 pre-opened on the top inclined plate 4. After the steel bars are inserted, the hole gap is immediately sealed by using the foam glue, so as to ensure the reliable sealing and prevent the cement slurry from seeping into the device during the concrete pouring, so as to cause the rust of the steel bar sleeve.

[0031] After the side wall concrete is poured and reaches the designed strength, the bottom membrane device is removed, and after cleaning and maintenance, it can be recycled for subsequent section construction. The whole construction process ensures the uniformity of the spacing of the side wall steel bars, improves the survival rate of the mechanical connection sleeve, and effectively controls the settlement problem after the concrete is poured.

[0032] In the above embodiments, the basic principles and main features of the present application and the advantages of the present application are described. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, the modifications and changes made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the protection scope of the claims attached to the present application.

Claims

1. A device for pre-fixing reinforcing bars in side walls constructed using the reverse construction method, characterized in that, It includes a base plate (1), a middle partition plate (6), a longitudinal outer plate (2), a longitudinal inner plate (3), and a top inclined plate (4); the middle partition plate (6) is fixedly connected to the base plate (1); the longitudinal outer plate (2) and the longitudinal inner plate (3) are arranged parallel to each other on both sides of the middle partition plate (6), and are fixedly connected to the base plate (1) and the middle partition plate (6); the top inclined plate (4) is inclinedly arranged on the top of the longitudinal outer plate (2) and the longitudinal inner plate (3), and is fixedly connected to both and the middle partition plate (6) to form a stable support structure; the top inclined plate (4) has multiple openings (5) for passing through the side wall reinforcement.

2. The pre-fixing device for side wall reinforcement in reverse construction according to claim 1, characterized in that, The longitudinal outer plate (2), longitudinal inner plate (3) and middle partition plate (6) are all fixedly connected to the bottom plate (1) and top inclined plate (4) by nails.

3. The pre-fixing device for side wall reinforcement in reverse construction according to claim 1, characterized in that, The device also includes multiple positioning steel bars (7), which are installed on the outside of the longitudinal outer plate (2) to limit and fix the entire device.

4. The pre-fixing device for side wall reinforcement in reverse construction according to claim 1, characterized in that, The diameter of the opening (5) is larger than the diameter of the side wall reinforcement, and the gap between the opening (5) and the inserted side wall reinforcement is sealed with foam glue.

5. A pre-fixing device for side wall reinforcement in reverse construction according to claim 1, characterized in that, The bottom plate (1), longitudinal outer plate (2), longitudinal inner plate (3), top inclined plate (4) and middle partition plate (6) are all made of laminated plywood material.

6. A method for pre-fixing side wall reinforcement using the reverse construction method with the device described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Device fabrication: Based on the design thickness of the side wall and the spacing of the reinforcing bars, the fixing device is fabricated and holes (5) are drilled on the top inclined plate (4) at the design spacing. S2. Node Design: During the construction of the inclined slab of the station roof, the structural nodes between the side walls and the inclined slab are designed in detail, and the construction joints are treated by the splintering and pre-reservation method. S3. Installation and positioning of the device: Place the finished fixing device at the design position at the bottom of the side wall, so that the longitudinal inner plate (3) faces the inner side of the structure, and then install the positioning steel bar (7) close to the longitudinal outer plate (2) to limit and fix the device through the positioning steel bar (7); S4. Reinforcing bar installation and sealing: Insert the side wall reinforcing bar with connecting sleeve into the opening (5) on the top inclined plate (4), and immediately seal the gap between the reinforcing bar and the opening (5) with foam glue after insertion. S5. Concrete pouring: Concrete pouring of the side walls is carried out. S6. Device Removal and Recycling: After the concrete reaches its strength, the fixing device is removed, cleaned, and then recycled.

7. The method for pre-fixing reinforcing bars in a side wall during reverse construction according to claim 6, characterized in that, In step S3, the position of the positioning steel bar (7) corresponds to the position of the intermediate partition plate (6) in the device.

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