A round concrete structure shaping combined formwork device

Abstract

This utility model discloses a prefabricated modular formwork device for circular concrete structures, belonging to the field of municipal engineering construction. The device includes an arc-shaped formwork, edge reinforcing members, arc-shaped support members, and tie bolts. The arc-shaped formwork is made of laminated plywood and has an arc that matches the circular structure. Adjacent arc-shaped formwork panels are spliced ​​together through an edge-fitting connection structure to form inner and outer ring-shaped formwork. The edge reinforcing members are placed between the arc-shaped formwork and the arc-shaped support members to improve the overall rigidity of the formwork. The arc-shaped support members include inner and outer arc-shaped steel pipe keels for providing support and shaping constraints. Several tie bolts penetrate the inner and outer formwork and support members to achieve overall locking and positioning. This invention combines factory-prefabricated processing of the arc-shaped formwork with on-site modular assembly, offering advantages such as lightweight structure, quick assembly, high forming accuracy, and reusability, significantly improving the construction quality and efficiency of circular concrete structures.

Description

Technical Field

[0001] This technical solution belongs to the field of municipal engineering construction technology, specifically a modular formwork device for circular concrete structures. Background Technology

[0002] Currently, in municipal engineering, water supply and drainage engineering and industrial building fields, circular reinforced concrete structures are widely used in pumping stations, circular pools in sewage treatment plants and circular caissons.

[0003] However, in the construction of such circular structures, formwork engineering is a crucial step that determines the accuracy and appearance quality of the concrete forming. Current construction methods typically employ two approaches: The first method is to customize steel formwork; the second is to assemble wooden formwork on-site.

[0004] However, all existing methods have obvious drawbacks: (1) Customized steel formwork is suitable for engineering projects with a large number of structures and high frequency of formwork turnover. However, in projects with a small number of structures or one-time projects, there are problems such as high manufacturing costs, heavy formwork weight, difficulty in handling, and reliance on hoisting equipment for installation and dismantling, which seriously affect construction efficiency and economy.

[0005] (2) As for the on-site wooden formwork assembly method, it is often assembled by wooden boards and reinforced with steel bars or square timber. This method is labor-intensive and time-consuming, the curvature accuracy of the formwork is difficult to guarantee, the uneven stress is easy to deform, and the surface of the concrete after pouring is rough and the quality is unstable. The formwork material is also difficult to reuse, resulting in resource waste and substandard quality.

[0006] The inventors discovered that the root cause of the above problems was: The existing formwork system lacks a lightweight, standardized formwork system suitable for circular structures, and it has significant shortcomings in terms of structural curvature accuracy, assembly and positioning, reinforcement methods, and ease of on-site operation. Summary of the Invention

[0007] To address the aforementioned issues, this invention proposes a prefabricated modular wooden formwork device for circular concrete structures. By combining the factory-made curvature shaping of the curved wooden formwork with a modular assembly system on-site, the device achieves lightweight, standardized, and rapid assembly construction of the formwork system.

[0008] This device uses high-strength plywood with a surface coating as the main body of the template. It is formed by double-sided hot pressing using specialized equipment to achieve a precise curvature that matches the circular structure. Adjacent template units adopt a tongue-and-groove (T&G) design to achieve automatic alignment and sealed splicing, thereby ensuring tight template joints and no grout leakage.

[0009] The edges of the formwork units are reinforced with wooden framing, and the system is stabilized during assembly using curved steel pipe framing. The steel pipe framing is precisely bent to the reinforcement radius using specialized equipment, fitting snugly against the outer edge of the formwork to ensure even stress distribution. During on-site assembly, "sickle clips" can be used to lock the "edge ribs" of two pre-formed curved formwork units together for quick connection, and "butterfly clips" are used to lock the tie bolts, forming a reliable, sturdy structure. This method is simple to construct, highly precise, and has a high turnover rate.

[0010] In order to solve the above-mentioned technical problems, the present invention discloses the following technical solution; A standardized modular formwork device for circular concrete structures includes: An arc-shaped template, which is made of sheet metal and has an arc that is compatible with circular structures, allows several adjacent arc-shaped templates to be spliced ​​together by edge-fitting connection structures to form a ring template; There are two annular templates, and the radii of the two annular templates are different. The annular template with a radius smaller than that of the circular structure is the inner annular template, and the annular template with a radius larger than that of the circular structure is the outer annular template. An edge reinforcement member is fixedly disposed between the edge of the arc-shaped template unit and the arc-shaped support member to improve the overall rigidity and connection strength of the template unit; An arc-shaped support component, comprising an inner arc-shaped support component and an outer arc-shaped support frame, wherein the inner arc-shaped support component is located inside the inner annular template and the outer arc-shaped support frame is located outside the outer annular template, for providing outward support and shaping constraints; Tie bolts, in multiple quantities, penetrate the inner and outer ring templates and the inner and outer arc-shaped support components along the thickness direction of the template, so that the template can be positioned by means of the tie bolts.

[0011] Furthermore, the starting points of the first arc-shaped template in the inner and outer ring templates are aligned to ensure that the assembly starting points of the inner and outer templates are consistent. This ensures that the corresponding positions of the two in the circumferential direction are accurate, thereby forming a one-to-one correspondence during the arrangement and installation of tie bolts, and improving the overall installation accuracy and construction efficiency of the template.

[0012] Furthermore, the arc-shaped template is made of laminated plywood, the surface of which has a waterproof and wear-resistant plastic film layer. The plastic film layer is bonded to the plywood through a hot-pressing process, which can effectively improve the water resistance and wear resistance of the template, prevent the template from absorbing water and deforming, extend the service life of the template, and at the same time, it can be easily demolded after the concrete is poured, thus improving the surface quality of the concrete.

[0013] Furthermore, the edge-fitting connection structure includes a protruding tongue and a recessed groove on the edge of the template, which fit together to form a circumferential splice. This allows for automatic alignment during template assembly, ensuring a tight fit between the template edges. This improves assembly accuracy and prevents concrete slurry from leaking from the splice, thus guaranteeing the appearance quality of the circular structure.

[0014] Furthermore, the edge reinforcing member is a back rib, which is set on the circumferential splice seam in the annular template, so that the back rib can contact the two arc-shaped templates of the annular template, so that it can form local reinforcement at the template splice, enhance the deformation resistance at the splice, avoid misalignment or cracking of the splice, and further improve the overall rigidity of the template system.

[0015] Furthermore, several intermediate back ribs are provided between the two edge reinforcing members, so that additional support can be provided in the middle of the template by setting the intermediate back ribs, making the template more uniformly stressed, preventing the middle section of the template from bulging or deforming, thereby ensuring the flatness and thickness accuracy of the wall after pouring.

[0016] Furthermore, the tie bolts are staggered along the vertical and circumferential directions of the template, which makes the template more evenly stressed, reduces localized stress concentration points, thereby improving the overall structural stability and effectively preventing the template from bulging or shifting during the pouring process.

[0017] Furthermore, the fastening components on both sides of the tie bolt are butterfly clips, which are used to quickly lock the two ends of the tie bolt and form a reliable clamping force with the outer support component of the template. Their function is to simplify the bolt fixing operation, realize the rapid assembly and disassembly of the template system, improve the locking reliability, and ensure the stability of the template during the pouring process.

[0018] Compared with the prior art, the present invention has the following outstanding advantages: I. Significantly improved structural and construction performance This invention utilizes hot-pressing and shaping of curved plywood boards to achieve precise control over the curvature of the template, resulting in a lightweight structure that is not easily deformed.

[0019] Adjacent template units adopt a tongue-and-groove splicing structure to achieve automatic alignment and tight assembly, prevent grout leakage, ensure tight joints and high accuracy of repeated assembly.

[0020] The template, together with the curved steel pipe keel, forms a closed stress-bearing system, which makes the template have high overall rigidity, good stability, and is not easy to bulge and deform.

[0021] II. Significantly Improved Construction Quality The formwork system has uniform stress distribution and tight joints, and the surface of the supported concrete wall is flat and dense, without honeycomb pitting or misalignment.

[0022] Actual measurements show that the circular concrete structure constructed using this invention has a wall surface flatness allowable deviation of +4 / -5mm and a verticality control within 6mm, which is significantly better than the existing wooden formwork system.

[0023] The plastic film layer on the outside of the template has excellent waterproof and demolding properties, ensuring that the appearance quality of the formed concrete meets the standards of fair-faced concrete.

[0024] III. Outstanding Economic and Social Benefits The formwork system is low in cost and lightweight, and does not require hoisting equipment during construction, significantly reducing labor and machinery costs.

[0025] Both the template and the keel can be reused multiple times, resulting in less waste, high resource utilization, and environmental friendliness.

[0026] Factory prefabrication and standardized assembly improve construction efficiency and reduce on-site processing workload.

[0027] Taking a pump room well wall with an inner diameter of 8m, a wall thickness of 50cm, and a height of 12.4m as an example, the construction cost using the device of this invention can be reduced by approximately 22,185.6 yuan, demonstrating significant economic benefits. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the unit division of the inner and outer annular templates of this utility model; Figure 2 This is a partial schematic diagram of the assembled modular formwork for a circular concrete structure according to the present invention. Figure 3 This is a schematic diagram of the arc-shaped template splicing of this utility model; Among them: 1. Inner ring template, 2. Outer ring template, 3. Protruding tongue, 4. Groove, 5. Edge reinforcing member, 6. Middle back rib, 7. Inner arc-shaped support member, 8. Outer arc-shaped support frame, 9. Tie bolt, 10. Butterfly clip, 11. Arc-shaped template A, 12. Arc-shaped template B, C. Wall.

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Specific Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Example 1: A modular formwork device for circular concrete structures, comprising: An arc-shaped template, which is made of laminated plywood, has a waterproof and wear-resistant plastic film layer on its surface and has an arc that is compatible with circular structures, so that several adjacent arc-shaped templates can be spliced ​​together by edge-fitting connection structures to form a ring template; The edge-fitting connection structure includes a protruding tongue 3 and a groove 4 set on the edge of the template, which fit together to form a circumferential splice joint, enabling automatic alignment during template assembly and ensuring a tight fit between the template edges. This improves assembly accuracy and prevents concrete slurry from leaking from the splice joint, thereby ensuring the appearance quality of the circular structure. There are two annular templates, and the radii of the two annular templates are different. The annular template with a radius smaller than that of the circular structure is the inner annular template 1, and the annular template with a radius larger than that of the circular structure is the outer annular template 2. The starting points of the first arc-shaped template in the inner ring template 1 and the outer ring template 2 are aligned so that the assembly starting points of the inner and outer templates are consistent. This ensures that the corresponding positions of the two in the circumferential direction are accurate, thereby forming a one-to-one correspondence when arranging and installing the tie bolts 9, and improving the overall installation accuracy and construction efficiency of the template. Edge reinforcing member 5 is fixedly disposed between the edge of the arc-shaped template unit and the arc-shaped support member to improve the overall rigidity and connection strength of the template unit; The edge reinforcing member 5 is a back rib. The back rib is set on the circumferential splice seam in the annular template so that the back rib can contact the two arc-shaped templates of the annular template, so that it can form local reinforcement at the template splice, enhance the deformation resistance at the splice, avoid splice misalignment or cracking, and further improve the overall rigidity of the template system. Several intermediate back ribs 6 are provided between the two edge reinforcing members 5, so that additional support can be provided in the middle of the template by setting the intermediate back ribs 6, making the template more evenly stressed, preventing the middle section of the template from bulging or deforming, thereby ensuring the flatness and thickness accuracy of the wall after pouring. An arc-shaped support component, comprising an inner arc-shaped support component 7 and an outer arc-shaped support frame 8, wherein the inner arc-shaped support component 7 is located inside the inner annular template 1 and the outer arc-shaped support frame 8 is located outside the outer annular template 2, for providing outward support and shaping constraints; Tie bolts 9, the number of which is several, penetrate the inner and outer ring templates and the inner and outer arc-shaped support components along the thickness direction of the template, so that the template can be positioned by the tie bolts 9; The tie bolts 9 are staggered along the vertical and circumferential directions of the template, which makes the template more evenly stressed, reduces local stress concentration points, thereby improving the overall structural stability and effectively preventing the template from bulging or shifting during the pouring process. The fastening components on both sides of the tie bolt 9 are butterfly clips 10. The butterfly clips 10 are used to quickly lock the two ends of the tie bolt 9, forming a reliable clamping force with the outer support component of the template. Their function is to simplify the bolt fixing operation, realize the quick assembly and disassembly of the template system, improve the locking reliability, and ensure the stability of the template during the pouring process.

[0032] In addition, the utility model discloses the following technical solutions based on the above embodiments; The edge-fitting connection structure can also be: a tenon-groove splicing structure (such as a flat tenon or a beveled tenon structure), a dovetail groove connection structure, a wedge-shaped insertion structure, or a shape-fitting locking structure (such as a snap-fit ​​edge with a limiting shoulder). Those skilled in the art can choose according to their needs.

[0033] The back rib can be any one of wooden back rib, steel flat back rib or aluminum alloy back rib, preferably square steel or square wood structure, to balance strength and weight. The intermediate back rib 6 can be made of angle steel, square steel pipe or double-layer timber structure to adapt to different template thicknesses and stress requirements; The arc-shaped support member can take any of the following forms: For steel pipe keels bent into arcs, arc-shaped channel steel or angle steel structures, and arc-shaped aluminum alloy profile supports, steel pipe keels bent into arcs are preferred.

[0034] 5. The tie bolt 9 can be an adjustable screw structure with a water-stop washer, or a through-thread bolt structure with a nut for limiting, so as to quickly adjust the template spacing.

[0035] How to use: 1. Select the materials and tools required for making the prefabricated wooden formwork device for circular concrete structures.

[0036] Materials include: Plywood (size: 2440mm×1220mm×22mm, with plastic film coating), steel pipe (size: φ48×4mm, length 6m), wood joists (size: 10mm×50mm) and steel bars (size: HRB400 grade ribbed steel bars with a diameter of 14mm).

[0037] The equipment includes: rebar cutter, handheld fine-tooth saw, benchtop electric saw, electric drill, etc.

[0038] 2. Based on the size requirements of the target circular structure, use CAD software to divide and number the template units.

[0039] The outer wall prefabricated modular formwork unit is divided into sections with an arc length of 1.22m (i.e., the standard formwork width), and the arc length of the last formwork unit should not be less than 0.6m.

[0040] The starting point of the inner template unit is the same as that of the outer template, and the center line of each inner template unit coincides with the center line of the outer template unit.

[0041] After the segmentation is completed, each template unit is numbered to facilitate factory processing and on-site installation.

[0042] 3. Based on the CAD segmentation results and design modules (i.e., the inner and outer diameters of the circular structure), process the templates and accessories: Template forming: Plywood with good plasticity is selected and double-sided hot pressing is used to make inner and outer arc-shaped plywood (1) to ensure that its curvature matches the structure. The concave and convex groove structure is processed on both sides of the template so that the templates can be self-aligned and spliced ​​through the concave and convex grooves to prevent grout leakage.

[0043] Curved support keel construction: Steel pipes (φ48×4mm) are bent according to the design curvature and used as the arc-shaped keel for the inner and outer templates.

[0044] 4. Before installing the formwork, mark the vertical control lines on the construction wall to ensure that the inner and outer elevations are consistent.

[0045] Drill holes in the wall every 1.0m and place steel bars of about 15cm in length on the poured wall. At the same time, mark the starting lines N1 and W1 of the inner and outer formwork to ensure that the starting points are aligned. Drill nine tie bolt holes in the template at the designed locations. The longitudinal spacing between the inner and outer curved templates is: 245mm + 550mm × 5 + 245mm; The inner lateral spacing is 0.37m, and the outer lateral spacing is 0.4m. First, install the inner curved plywood board, insert the tie bolts 9, and then install the edge reinforcing members 5 and the middle back ribs 6 and the inner curved fixed steel pipe keel on both sides of the curved plywood board in sequence, and carry out temporary reinforcement. Then, the outer curved plywood board is installed, and edge reinforcing members 5 and the middle back rib 6 and the outer curved fixed steel pipe keel are arranged on both sides of the curved plywood board. After all the horizontal arc-shaped support keels are installed, tighten the "butterfly clips 10" at both ends of the tie bolts 9 to lock the entire template.

[0046] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A standardized modular formwork device for circular concrete structures, characterized in that, include: An arc-shaped template, which is made of sheet metal and has an arc that is compatible with circular structures, allows several adjacent arc-shaped templates to be spliced ​​together by edge-fitting connection structures to form a ring template; There are two annular templates, and the radii of the two annular templates are different. The annular template with a radius smaller than that of the circular structure is the inner annular template, and the annular template with a radius larger than that of the circular structure is the outer annular template. An edge reinforcement member is fixedly disposed between the edge of the arc-shaped template unit and the arc-shaped support member to improve the overall rigidity and connection strength of the template unit; An arc-shaped support component, comprising an inner arc-shaped support component and an outer arc-shaped support frame, wherein the inner arc-shaped support component is located inside the inner annular template and the outer arc-shaped support frame is located outside the outer annular template, for providing outward support and shaping constraints; Tie bolts, in multiple quantities, penetrate the inner and outer ring templates and the inner and outer arc-shaped support components along the thickness direction of the template, so that the template can be positioned by means of the tie bolts.

2. The standardized modular formwork device for circular concrete structures according to claim 1, characterized in that, The starting points of the inner ring template and the first arc-shaped template in the outer ring template are aligned.

3. The standardized modular formwork device for circular concrete structures according to claim 1, characterized in that, The arc-shaped template is made of laminated plywood.

4. The standardized modular formwork device for circular concrete structures according to claim 1, characterized in that, The edge-fitting connection structure includes a protruding tongue and a recessed groove on the edge of the template, which fit together to form a circumferential splice seam.

5. A standardized modular formwork device for circular concrete structures according to claim 1, characterized in that, The edge reinforcement member is a back rib, which is set on the circumferential splice seam in the annular template so that the back rib can contact the two arc-shaped templates of the annular template.

6. The standardized combined formwork device for circular concrete structures according to claim 5, characterized in that, Several intermediate back ribs are provided between the two edge reinforcing members.

7. A modular formwork device for circular concrete structures according to claim 1, characterized in that, The tie bolts are arranged alternately in the vertical and circumferential directions along the template.

8. A modular formwork device for circular concrete structures according to claim 1, characterized in that, The fastening components on both sides of the tie bolt are butterfly clips.

9. A modular formwork device for circular concrete structures according to claim 1, characterized in that, The arc length of the last arc-shaped template in the annular template should be no less than 0.6m.

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