Positioning construction method for thin-walled cavity multi-curved as-cast concrete modeling arch rib steel mesh

Abstract

This invention discloses a method for positioning and constructing steel mesh for thin-walled, hollow, multi-curved fair-faced concrete arches. The method involves setting up a support structure composed of beams, columns, and steel beams, and wrapping extruded polystyrene (XPS) boards around the support. The shape of the XPS board is controlled by limiting plates to ensure it matches the inner wall shape of the arch. Using the XPS board as a reference surface, the first layer of steel mesh is positioned and fixed using first and second positioning ribs and spacers, ensuring accurate positioning. Subsequent steel mesh layers are laid using the previous layer as a reference, with the spacing between adjacent layers controlled by welding short steel bars between them, thus achieving accurate positioning. Inspection fixtures are used to check the positioning of the outermost layer of steel mesh, and adjustments are made to the shape of the steel mesh based on the inspection results, ensuring smooth installation of the outer formwork for the subsequent arch casting.

Description

Technical Field

[0001] This invention relates to the field of steel mesh construction technology, specifically to a method for positioning and constructing steel mesh for thin-walled, hollow, multi-curved fair-faced concrete arches. Background Technology

[0002] Thin-walled hollow multi-curved fair-faced concrete arches are generally designed as rings, surrounding the main body of the building, and mainly serve a decorative purpose. The perimeter of this concrete structure is relatively long, and it is usually divided into several arc-shaped segments for segmented casting.

[0003] Thin-walled, hollow, multi-curved fair-faced concrete arches have relatively thin walls, typically around 150mm. To ensure structural strength after casting, several steel meshes need to be installed between the inner and outer formwork before casting. The steel meshes adjacent to the casting formwork need to be spaced a certain distance apart as a protective layer, with a thickness of not less than 25mm. This ensures that the steel meshes are completely submerged in the concrete after casting and will not be exposed, preventing the steel bars from rusting and breaking due to exposure, which would affect the structural strength of the arch.

[0004] Because the outer wall of the thin-walled, hollow, multi-curved fair-faced concrete arch is an irregular curved surface, when setting up the steel mesh, each steel bar needs to be bent and positioned individually, and then the intersecting steel bars are fixed and connected to form a mesh structure, thus conforming to the curved surface structure of the arch. At the same time, it is also necessary to ensure that a protective layer is left between the curved steel mesh and the adjacent cast-in-place formwork under a foundation with a wall thickness of 150mm. Therefore, the accuracy of the spatial positioning of the steel mesh is required to be high. In actual construction, it is very easy to fail to leave sufficient protective layer thickness due to inaccurate positioning of the steel mesh, and it is also impossible to install the precast cast-in-place formwork.

[0005] Therefore, this application proposes a method for positioning and constructing thin-walled, hollow, multi-curved fair-faced concrete arches with steel mesh to solve the above-mentioned technical problems. Summary of the Invention

[0006] The main objective of this invention is to address the aforementioned shortcomings by providing a method for positioning steel mesh in thin-walled, hollow, multi-curved fair-faced concrete arches, which facilitates the positioning of the steel mesh and ensures its accuracy.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] The construction method for positioning the steel mesh of a thin-walled, hollow, multi-curved fair-faced concrete arch includes the following steps:

[0009] S1. Based on the design curvature of the arch, multiple beams and columns with the same spacing are arranged around it, and steel beams with the same curvature as the design curvature of the arch are erected between adjacent beams and columns.

[0010] S2. Multiple limiting plates are evenly spaced on the steel beam, with gaps between the limiting plates and the beam and steel beam, and the limiting plates are fixedly connected to the scaffolding around the steel beam.

[0011] S3. Plant multiple sets of first positioning steel bars at even intervals at the bottom of the steel beam, and plant second positioning steel bars at even intervals around the bottom of the beam and column.

[0012] S4. Trim and grind the extruded polystyrene board, and fill the gap between the limiting plate and the beam and steel beam with the ground extruded polystyrene board. Adjacent extruded polystyrene boards are connected by adhesive, and multiple mutually bonded extruded polystyrene boards form a whole and wrap around the beam and steel beam.

[0013] S5. Remove the limiting plate;

[0014] S6. Install a vertical bar at the first positioning bar, place a pad on the vertical bar, bend the vertical bar so that the pad abuts against the extruded board, and then fix the vertical bar to the intersection of the first positioning bar and the vertical bar.

[0015] S7. Install horizontal and side bars, place spacers on the horizontal and side bars, bend the horizontal and side bars until the spacers abut against the extruded board, fix the vertical bars, horizontal bars and side bars at the intersection, and fix the horizontal and side bars at the beam and column to the second positioning bar.

[0016] S8. Densify the vertical bars, horizontal bars and side bars to form a steel mesh;

[0017] S9. Repeat steps S6 to S8 above to complete the laying of the remaining layers of steel mesh according to the design requirements. When repeating the operation, there is no need to set spacers on the steel bars. The spacing between adjacent steel meshes is controlled by fixing short steel bars.

[0018] Furthermore, a limiting hole is provided on the limiting plate, and the shape of the limiting hole is the same as the shape of the inner wall of the cavity of the arched shape on the limiting plate.

[0019] Furthermore, the steel beam includes a connecting portion fixedly connected to the beam column and an extension portion fixedly connected to the other end of the connecting portion, wherein the cross-section of the connecting portion is larger than the cross-section of the extension portion.

[0020] Furthermore, the number of turns of the second positioning steel bar is equal to the number of layers of the steel mesh.

[0021] Furthermore, the construction method for positioning the steel mesh of the thin-walled hollow multi-curved fair-faced concrete arch also includes: S10, cutting off or bending the part of the first positioning steel bar that passes through the outermost steel mesh until it no longer passes through the steel mesh.

[0022] Furthermore, the method for positioning the steel mesh of the thin-walled hollow multi-curved fair-faced concrete arch also includes: S11, using positioning inspection tools to check the positioning accuracy of the outermost steel mesh.

[0023] Furthermore, the positioning inspection fixture includes a frame fitted over the outside of the extruded board and multiple positioning rods that are movably inserted through the frame.

[0024] Furthermore, in step S11, the specific operation steps are as follows:

[0025] S11.1. Arrange the multiple inspection fixtures evenly on the outside of the extruded board;

[0026] S11.2 Adjust the depth of the positioning rods inserted into the frame so that the plane shape formed by the insertion ends of each positioning rod is equal to the theoretical shape of the steel mesh in that plane;

[0027] S11.3. Compare the planar shape formed by the insertion ends of each positioning rod with the actual shape of the steel mesh on that plane.

[0028] The beneficial effects of this invention are reflected in:

[0029] This invention employs a support structure composed of beams, columns, and steel beams, with extruded polystyrene (XPS) boards wrapped around it. The shape of the XPS boards is controlled by limiting plates, ensuring that the XPS board's shape matches the inner wall shape of the shaped arch. Using the XPS board as a reference surface, the first layer of reinforcing mesh is positioned and fixed using first and second positioning ribs and spacers, ensuring accurate positioning of the first layer of reinforcing mesh. Subsequent layers of reinforcing mesh are laid with the previous layer as a reference, and the spacing between adjacent layers is controlled by welding short reinforcing bars between them, thus achieving accurate positioning of subsequent layers. By setting up inspection fixtures, the positioning of the outermost layer of reinforcing mesh is checked, and the shape of the reinforcing mesh is adjusted accordingly based on the inspection results, ensuring the smooth installation of the outer formwork for the subsequent casting of the shaped arch. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of step S1 of the present invention.

[0032] Figure 2 This is a schematic diagram of step S2 of the present invention.

[0033] Figure 3This is a schematic diagram of step S3 of the present invention.

[0034] Figure 4 This is a schematic diagram of step S4 of the present invention.

[0035] Figure 5 This is a schematic diagram of step S5 of the present invention.

[0036] Figure 6 This is a schematic diagram of step S6 of the present invention.

[0037] Figure 7 This is a schematic diagram of step S7 of the present invention.

[0038] Figure 8 This is a schematic diagram of step S8 of the present invention.

[0039] Figure 9 This is a schematic diagram of step S10 of the present invention.

[0040] Figure 10 This is a schematic diagram of step S11 of the present invention.

[0041] Figure 11 This is a schematic diagram of the inspection tooling structure of the present invention;

[0042] Figure 12 This is a schematic diagram of the limiting plate structure of the present invention.

[0043] In the diagram: 1. Beam and column; 2. Steel beam; 21. Connection part; 22. Extension part; 3. Limiting plate; 4. First positioning reinforcement; 5. Second positioning reinforcement; 6. Extruded polystyrene board; 7. Vertical reinforcement; 8. Horizontal reinforcement; 9. Side reinforcement; 10. Inspection fixture; 101. Frame; 102. Positioning rod; 11. Limiting hole. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figure 1-12 As shown, this invention provides a method for positioning and constructing steel mesh for thin-walled, hollow, multi-curved fair-faced concrete arches, comprising the following steps:

[0046] S1. Based on the design curvature of the arch, multiple beams and columns 1 with the same spacing are set around it, and steel beams 2 with the same curvature as the design curvature of the arch are erected between adjacent beams and columns 1.

[0047] S2. Multiple limiting plates 3 are evenly spaced on the steel beam 2. The limiting plates 3 are left with gaps between themselves and the beam column 1 and the steel beam 2. The limiting plates 3 are fixedly connected to the scaffolding around the steel beam 2.

[0048] S3. Plant multiple sets of first positioning steel bars 4 at even intervals at the bottom of steel beam 2, and plant second positioning steel bars 5 at even intervals around the bottom of beam and column 1.

[0049] S4. Trim and grind the extruded polystyrene board 6, and fill the gap between the limiting plate 3 and the beam column 1 and the steel beam 2 with the ground extruded polystyrene board 6. Adjacent extruded polystyrene boards 6 are connected by adhesive, and multiple mutually bonded extruded polystyrene boards 6 form a whole and wrap around the beam column 1 and the steel beam 2.

[0050] S5. Remove limit plate 3;

[0051] S6. Install vertical bars 7 at the first positioning steel bar 4, place a pad on the vertical bar 7, bend the vertical bar 7 so that the pad abuts against the extruded board 6, and then fix the vertical bar 7 and the first positioning steel bar 4 at the intersection.

[0052] S7. Install horizontal bars 8 and side bars 9. Place spacers on horizontal bars 8 and side bars 9. Bend horizontal bars 8 and side bars 9 until spacers abut against extruded polystyrene board 6. Fix vertical bars 7, horizontal bars 8 and side bars 9 at the intersection. Fix horizontal bars 8 and side bars 9 at beam and column 1 to the second positioning bar 5.

[0053] S8, 7 vertical bars, 8 horizontal bars, and 9 side bars form a layer of steel mesh;

[0054] S9. Repeat steps S6 to S8 above to complete the laying of the remaining layers of steel mesh according to the design requirements. When repeating the operation, there is no need to set spacers on the steel bars. The spacing between adjacent steel meshes is controlled by fixing short steel bars.

[0055] In step S1, the structure formed by the fixed connection between beam 1 and steel beam 2 serves as the support frame for the thin-walled hollow multi-curved fair-faced concrete arch, providing stable support for the arch and also acting as the wrapping object for the extruded polystyrene board 6 in the subsequent step S4. The overall structure formed by bonding multiple extruded polystyrene boards 6 together fills the cavity of the thin-walled hollow multi-curved fair-faced concrete arch. When casting the arch, the outer wall of the extruded polystyrene board 6 acts as the inner lining of the arch. Therefore, the distance between the steel mesh and the extruded polystyrene board 6 is the distance between the steel mesh and the inner wall of the cast arch. The first layer of steel mesh is accurately positioned and installed through steps S6 to S8. Then, using the first layer of steel mesh as a reference, subsequent steel meshes are laid through step S9 to achieve accurate positioning of the subsequent steel meshes.

[0056] It is worth explaining that, in Figure 4-11 In the diagram, the extruded polystyrene (XPS) board 6 covering the beams 1 and 2 is a single unit, actually composed of multiple XPS boards 6 bonded together. There should be joints between adjacent XPS boards 6, which are not shown in the figure. In addition, spacers are placed between the vertical bars 7, horizontal bars 8, and side bars 9 of the first layer of reinforcing mesh and the XPS board 6. Since spacers are commonly used in this field to control the spacing of reinforcing mesh, those skilled in the art can easily understand the specific usage of the spacers from steps S6 and S7, therefore they are not shown in the figure.

[0057] In one embodiment, a limiting hole 11 is provided on the limiting plate 3, and the shape of the limiting hole 11 is the same as the shape of the inner wall of the cavity of the shaped arch at the limiting plate 3. When casting the shaped arch, the outer wall of the extruded polystyrene board 6 serves as the casting inner membrane of the shaped arch. At the same time, the extruded polystyrene board 6 is also the reference surface for laying the first layer of steel mesh. The shape of the extruded polystyrene board 6 is controlled by the limiting hole 11. Therefore, it should be ensured that the shape of the limiting hole 11 is the same as the shape of the inner wall of the cavity of the shaped arch at the limiting plate 3, so as to ensure the accuracy of the positioning of the first layer of steel mesh. The first layer of steel mesh then serves as the reference for the positioning of subsequent steel meshes.

[0058] It should be noted that, in order to ensure that the outer wall of the extruded polystyrene board 6, which is assembled into a whole, is as similar in shape as possible to the inner wall of the cavity of the arch, the limiting plates 3 should be set as densely as possible.

[0059] In one embodiment, the steel beam 2 includes a connecting portion 21 fixedly connected to the beam-column 1 and an extension portion 22 fixedly connected to the other end of the connecting portion 21. The cross-section of the connecting portion 21 is larger than that of the extension portion 22. The structure formed by the fixed connection between the beam-column 1 and the steel beam 2 serves as a support frame for the thin-walled, hollow, multi-curved fair-faced concrete arch, providing stable support for the arch. Due to the shape and structural characteristics of the arch, the connecting portion 21 bears a greater load than the extension portion 22. Therefore, its load-bearing capacity is increased by increasing the cross-section of the connecting portion 21.

[0060] In one embodiment, the number of turns of the second positioning reinforcement 5 is equal to the number of layers of the steel mesh. The innermost second positioning reinforcement 5 is used to connect the vertical reinforcement 7 and the side reinforcement 9 of the first layer of steel mesh near the beam and column 1, and the spacing between the second positioning reinforcement 5 and the extruded polystyrene board 6 in the same turn is equal.

[0061] In one embodiment, the method for positioning the reinforcing mesh of a thin-walled, hollow, multi-curved fair-faced concrete arch further includes: S10, cutting off or bending the portion of the first positioning reinforcing bar 4 that protrudes beyond the outermost reinforcing mesh until it no longer protrudes beyond the mesh. Because a protective layer is reserved between the outermost reinforcing mesh and the outer formwork of the arch, the first positioning reinforcing bar 4 protruding beyond the outermost mesh is prevented from interfering with the subsequent installation of the outer formwork for the arch, and the first positioning reinforcing bar 4 is also prevented from being exposed after the arch is cast.

[0062] In one embodiment, the method for positioning the reinforcing mesh of a thin-walled, hollow, multi-curved fair-faced concrete arch further includes: S11, using a positioning inspection fixture 10 to check the positioning accuracy of the outermost reinforcing mesh. To ensure the smooth installation of the outer formwork for subsequent arch casting and to prevent the outermost reinforcing mesh from interfering with the installation of the casting formwork, the positioning of the outermost reinforcing mesh needs to be checked after all multiple layers of reinforcing mesh have been laid.

[0063] In one embodiment, the positioning inspection fixture 10 includes a frame 101 sleeved on the outside of the extruded board 6 and multiple positioning rods 102 movably passing through the frame 101.

[0064] In one embodiment, the specific operation steps in step S11 are as follows:

[0065] S11.1. Arrange multiple inspection fixtures 10 evenly on the outside of the extruded polystyrene board 6;

[0066] S11.2 Adjust the depth of the positioning rods 102 inserted into the frame 101 so that the plane shape formed by the insertion ends of each positioning rod 102 is equal to the theoretical shape of the steel mesh in that plane;

[0067] S11.3 Compare the planar shape formed by the insertion ends of each positioning rod 102 with the actual shape of the steel mesh on that plane.

[0068] The main function of the inspection fixture 10 is to utilize the different insertion depths of each positioning rod 102 into the frame 101 to form the theoretical planar shape of the reinforcing mesh at that location. By comparing the actual shape of the reinforcing mesh at that plane, the positioning accuracy of the reinforcing mesh can be checked. If the positioning is inaccurate, adjustments need to be made. When the actual shape of the reinforcing mesh protrudes beyond the theoretical shape at that location, the protruding part can be cut off and reinforcing bars can be welded at both ends of the cut to make the welded reinforcing bars fit the theoretical shape at that location. When the actual shape of the reinforcing mesh is concave within the theoretical shape at that location, reinforcing bars can be welded into the concave area to fill the groove, so that the welded reinforcing bars can fit the theoretical shape at that location.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0070] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0071] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A method for positioning and constructing steel mesh for thin-walled, hollow, multi-curved fair-faced concrete arches, characterized in that: Includes the following steps: S1. According to the design of the arch, multiple beams and columns with the same spacing are set around it (1), and steel beams (2) with the same arc as the design of the arch are erected between adjacent beams and columns (1). S2. Multiple limiting plates (3) are evenly spaced on the steel beam (2). There is a gap between the limiting plate (3) and the beam column (1) and the steel beam (2). The limiting plate (3) is fixedly connected to the scaffolding around the steel beam (2). The limiting plate (3) is in the shape of a door, and a limiting hole (11) is provided on the limiting plate (3). The shape of the limiting hole (11) is the same as the shape of the inner wall of the cavity of the arched shape at the limiting plate (3). S3. Plant multiple sets of first positioning steel bars (4) at even intervals at the bottom of the steel beam (2), and plant second positioning steel bars (5) at even intervals around the bottom of the beam column (1). S4. Trim and polish the extruded polystyrene board (6), and fill the gap between the limiting plate (3) and the beam (1) and steel beam (2) with the polished extruded polystyrene board (6). Adjacent extruded polystyrene boards (6) are glued together, and multiple glued extruded polystyrene boards (6) form a whole and wrap around the beam (1) and steel beam (2). S5. Remove the limiting plate (3); S6. Install a vertical bar (7) at the first positioning bar (4), place a pad on the vertical bar (7), bend the vertical bar (7) so that the pad abuts against the extruded board (6), and then fix the vertical bar (7) and the first positioning bar (4) at the intersection. S7. Install horizontal bars (8) and side bars (9). Place pads on the horizontal bars (8) and side bars (9). Bend the horizontal bars (8) and side bars (9) until the pads abut against the extruded board (6). Fix the vertical bars (7), horizontal bars (8) and side bars (9) at the intersection. Fix the horizontal bars (8) and side bars (9) at the beam and column (1) to the second positioning bar (5). S8. Densify the vertical bars (7), horizontal bars (8) and side bars (9) to form a layer of steel mesh; S9. Repeat steps S6 to S8 above to complete the laying of the remaining layers of steel mesh according to the design requirements. When repeating the operation, there is no need to set spacers on the steel bars. The spacing between adjacent steel meshes is controlled by fixing short steel bars.

2. The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches as described in claim 1, characterized in that, The steel beam (2) includes a connecting part (21) fixedly connected to the beam column (1) and an extension part (22) fixedly connected to the other end of the connecting part (21). The cross section of the connecting part (21) is larger than the cross section of the extension part (22).

3. The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches as described in claim 1, characterized in that, The number of turns of the second positioning steel bar (5) is equal to the number of layers of the steel mesh.

4. The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches as described in claim 1, characterized in that, The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches also includes: S10. Cut off or bend the portion of the first positioning steel bar (4) that extends beyond the outermost steel mesh until it no longer extends beyond the steel mesh.

5. The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches as described in claim 1, characterized in that, The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches also includes: S11. Use positioning inspection tool (10) to check the positioning accuracy of the outermost steel mesh.

6. The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches as described in claim 5, characterized in that, The positioning inspection fixture (10) includes a frame (101) sleeved on the outside of the extruded board (6) and multiple positioning rods (102) movably passing through the frame (101).

7. The method for positioning and constructing steel mesh for thin-walled hollow multi-curved fair-faced concrete arches as described in claim 6, characterized in that, In step S11, the specific operation steps are as follows: S11.

1. Arrange the multiple inspection fixtures (10) evenly on the outside of the extruded board (6); S11.2 Adjust the depth of the positioning rod (102) inserted into the frame (101) so that the plane shape formed by the insertion end of each positioning rod (102) is equal to the theoretical shape of the steel mesh in the plane; S11.

3. Compare the planar shape formed by the insertion end of each positioning rod (102) with the actual shape of the steel mesh in that plane.

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