Membrane material formwork construction method for cast-in-place concrete curved surface retaining wall and constraint component system

Abstract

The invention relates to a membrane material formwork construction method for a cast-in-place concrete curved surface retaining wall and a constraint component system. The constraint component system comprises a main frame component, a top pre-bending component, a membrane material clamp and a side constraint. The main frame component is fixed to the periphery of the curved retaining wall, the top pre-bending component is matched with a design curve of the curved retaining wall and fixed to the top of the main frame component, and the cross section of the top pre-bending component and the cross section of the curved retaining wall are located in the same vertical curved surface. The membrane material clamp is installed on the top pre-bending component and used for hanging a membrane material template, the upper end of the side face constraint is fixed to the main frame component, the lower end of the side face constraint is installed on the foundation structure, and the side face constraint abuts against the surface of the membrane material template and used for limiting deformation of the membrane material template. Compared with the prior art, the invention has the advantages of convenient construction, recoverable parts, low cost and the like.

Description

Technical Field

[0001] This invention relates to the field of concrete construction technology, and in particular to a method for constructing a membrane formwork and a constraint component system for cast-in-place curved concrete retaining walls. Background Technology

[0002] Cast-in-place concrete retaining walls are widely used in urban infrastructure, landscape engineering, and various building projects. As architectural designs become increasingly complex and diverse, the requirements for the shape and construction precision of retaining walls are also rising. Traditional cast-in-place concrete construction methods often use rigid formwork such as wooden or steel formwork. Because rigid formwork has a fixed shape, it is difficult to achieve complex curved surfaces and diverse appearance designs. Furthermore, rigid formwork has high processing costs, long customization cycles, and requires additional surface treatment after construction, further increasing construction costs and time.

[0003] In recent years, flexible formwork technology has emerged due to its excellent elastic deformation properties, which can effectively solve the shortcomings of rigid formwork in the construction of complex geometries. However, current flexible formwork technologies typically use tie rods that pass through the concrete and connect to the reinforcing cage to achieve constraint control of the formwork.

[0004] For example, patent application CN202311034452.7 discloses a multi-curved formwork system and its construction method for a thin-shell concrete structure. This multi-curved formwork system includes a multi-curved adjustable formwork for adapting and adjusting to the curved surface of the thin-shell concrete structure to be poured; a vertical frame supported between the ground and the multi-curved adjustable formwork; and multiple adjusting screw assemblies positioned between the ground and the multi-curved adjustable formwork, each of which can adjust the curved shape of the multi-curved adjustable formwork according to its length extension and contraction. This invention avoids problems such as grout leakage and formwork bursting.

[0005] The aforementioned construction methods not only require strict control over the position and precision of the reinforcing bars, increasing construction difficulty and cost, but also necessitate that the tie rods remain in place after concrete pouring to provide continuous tension, making them difficult to disassemble flexibly and unable to adapt to different engineering design requirements. Furthermore, the existing technology's constraints limit the choice of materials for the restraint components and its limited arrangement methods, making it difficult to achieve parametric adjustments and rich external surface textures. They are also easily damaged by the root systems of climbing plants, significantly restricting their application potential in urban landscapes and personalized architectural projects.

[0006] Therefore, there is an urgent need for a new type of flexible formwork cast-in-place concrete construction method that is convenient to construct, highly flexible, allows for the removal or retention of constraint components, and enables the creation of complex curved surfaces and rich textural effects through parametric control, in order to meet the growing demand for complex shapes and improve construction efficiency and economy. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art, such as construction difficulties, high costs, and difficulty in flexible disassembly, and to provide a method and components for the construction of membrane templates for cast-in-place curved concrete retaining walls.

[0008] The objective of this invention can be achieved through the following technical solutions:

[0009] This solution provides a method for constructing membrane formwork for cast-in-place curved concrete retaining walls, including the following steps:

[0010] S1: Tie the foundation steel bars and retaining wall steel cage, pour the foundation concrete, and obtain the foundation structure;

[0011] S2: Build the main frame structure on top of the foundation structure, so that the main frame structure encloses the outside of the retaining wall;

[0012] S3: Fabricate the top pre-bent component according to the design curve, fix the top pre-bent component to the top of the main frame structure, and make the top pre-bent component correspond to the design curve of the curved retaining wall;

[0013] S4: Fix the membrane clamp to the top pre-bent member and clamp the upper end of the membrane template so that the top pre-bent member fits the design curve of the curved retaining wall.

[0014] S5: Install an interlaced steel cable mesh structure on the inside of the membrane template;

[0015] S6: Install vertical steel pipe restraint components on the outside of the membrane template;

[0016] S7: Pour the curved retaining wall concrete and cure it. After the concrete has solidified, remove the steel pipe restraint components and the main frame structure. Remove or retain the membrane template and steel cable mesh structure according to the design requirements.

[0017] S8: Install the capping component on the top of the curved retaining wall, and backfill and compact the soil around the curved retaining wall in layers to complete the construction.

[0018] Furthermore, in S4, the specific fixing process of the membrane template includes: clamping the membrane template with a membrane clamp, suspending the membrane template, and evenly unfolding it; gradually adjusting the tension of the membrane template to make the surface of the membrane template flat and conform to the design curve, thus completing the initial installation of the membrane template.

[0019] Furthermore, in S5, the upper end of the steel cable mesh structure is fixed to the top of the main frame structure, and the lower end is connected to the foundation structure through anchors. The two sides of the steel cable mesh structure are fixed to the side members with steel cable fasteners. After the steel cable mesh structure is fixed, the tension of the steel cables is adjusted so that the membrane template is evenly stressed during the pouring process.

[0020] Furthermore, in S6, the steel pipe constraint member includes multiple vertical steel pipes, the upper end of which is connected to the main frame structure and the lower end is fixed to the foundation structure. The lower end of the membrane template is installed on the steel pipes through bottom constraint fasteners.

[0021] Furthermore, in S7, the concrete pouring process for the curved retaining wall is as follows:

[0022] Concrete of design grade with a slump of 80-150 mm was selected for construction.

[0023] The pouring process is carried out in layers, with each layer ranging from 300 to 500 millimeters in thickness.

[0024] After each layer is poured, it is vibrated to ensure that the concrete fills the membrane formwork evenly.

[0025] During the pouring process, the deformation of the membrane template is monitored in real time, and tension or support adjustments are made accordingly.

[0026] Furthermore, in S7, if the membrane template and steel cable mesh structure are retained as the outer decorative layer of the curved retaining wall, they form a support for climbing plants; if the membrane template and steel cable mesh structure are removed, a curved retaining wall with a natural texture is formed.

[0027] Furthermore, the membrane template uses PVC film or polyester fabric as the flexible template material.

[0028] This solution also provides a membrane formwork fixing component for curved retaining walls, used in the above-mentioned membrane formwork construction method for cast-in-place concrete curved retaining walls. The constraint component system includes a main frame component, a top pre-bent component, a membrane clamp, and side constraints.

[0029] The main frame component is fixed to the periphery of the curved retaining wall. The top pre-bent component matches the design curve of the curved retaining wall and is fixed to the top of the main frame component. The cross-section of the top pre-bent component and the curved retaining wall are located in the same vertical curved surface.

[0030] The membrane clamp is installed on the top pre-bent member for suspending the membrane template. The upper end of the side constraint is fixed to the main frame member, and the lower end is installed on the foundation structure. The side constraint abuts against the surface of the membrane template to limit the deformation of the membrane template.

[0031] Furthermore, the lateral constraint includes a cable mesh structure, which is set on the side of the membrane template close to the retaining wall; the upper end of the cable mesh structure is fixed to the top of the main frame structure, and the lower end is connected to the foundation structure through anchors; the two sides of the cable mesh structure are fixed to the side members with cable fasteners.

[0032] Furthermore, the lateral restraint includes a steel pipe restraint member, which is located on the side of the membrane template away from the retaining wall; the steel pipe restraint member includes multiple vertical steel pipes, the upper end of which is connected to the main frame structure and the lower end is fixed to the foundation structure, and the lower end of the membrane template is installed on the steel pipes through bottom restraint fasteners.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] (1) The constraint component system of the present invention includes a main frame structure, a top-mounted capping component, and side constraints, all fixed to the outside of the retaining wall, forming an independent structural system. It can be flexibly disassembled after installation, and construction is convenient and cost-effective. This differs from the existing technology where tie rods need to be fixed to the reinforcing cage of the retaining wall. The present invention allows for flexible selection of materials with different properties, such as rigid steel pipes or flexible steel cables, as the side constraint structure according to actual needs. The arrangement of the side constraints can be adjusted parametrically, thereby creating a rich variety of textural effects on the concrete surface.

[0035] (2) Existing tie rod constraints must remain in place after construction to continue exerting tensile force, while all constraint components of this invention can be retained or removed independently according to the design purpose. After removing the constraint components, the wall surface obtains a complete curved structure. Moreover, retaining the inner constraint of the steel cable mesh components can give the wall more functions, such as allowing plants to climb and grow along the steel cables, achieving an ecological beautification effect.

[0036] (3) All construction materials of the present invention, such as steel pipes, steel cables and flexible membrane materials, are conventional and readily available materials on the construction site. Compared with the existing tie rod constraint method, which requires strict control of the position of the reinforcing bars in order to accurately fix the tie rod, the construction method of the present invention is more flexible, easier to operate and more relaxed in terms of construction accuracy, effectively reducing the difficulty of construction and improving the convenience and efficiency of actual engineering implementation. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall cross-sectional isometric structure of the membrane template provided by the present invention;

[0038] Figure 2 This is a schematic diagram of the steel bar binding structure provided by the present invention;

[0039] Figure 3 A schematic diagram of the basic template provided by this invention;

[0040] Figure 4 This is a schematic diagram of the structure after the basic structure of the present invention has been poured;

[0041] Figure 5A schematic diagram of the assembly structure of the main frame components provided by the present invention;

[0042] Figure 6 A schematic diagram of the structure of the pre-installed drainage pipe and lamp tube inside the steel cage provided by the present invention;

[0043] Figure 7 This is a structural schematic diagram of a pre-bent top component fixed on a main frame member provided by the present invention;

[0044] Figure 8 This is a schematic diagram of the structure of the membrane template suspension provided by the present invention;

[0045] Figure 9 A schematic diagram of the structure for installing the pre-formwork template of the steel pipe constraint member provided by the present invention;

[0046] Figure 10 This is a schematic diagram of the structure after the wooden template has been installed, as provided by the present invention.

[0047] Figure 11 This is a schematic diagram of the retaining wall structure after pouring, as provided by the present invention.

[0048] Figure 12 This is a schematic diagram of the structure after the pressure cap is installed according to the present invention;

[0049] In the diagram: 1. Main frame component, 2. Back wooden formwork, 3. Internal steel mesh, 4. Drainage pipe, 5. Foundation structure, 6. Top pre-bent component, 7. Upper restraint fastener, 8. Membrane clamp, 9. Membrane formwork, 10. Side restraint, 11. Bottom restraint fastener, 12. Foundation wooden formwork, 13. Light tube, 14. LED light wiring, 15. Coping. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0056] Example 1

[0057] like Figures 1 to 12 As shown, this embodiment provides a method for constructing membrane formwork for cast-in-place curved concrete retaining walls, including the following steps:

[0058] S1: Tie the foundation steel bars and retaining wall steel cage, pour the foundation concrete, and obtain the foundation structure;

[0059] S2: Build the main frame structure on top of the foundation structure, so that the main frame structure encloses the outside of the retaining wall;

[0060] S3: Fabricate the top pre-bent component according to the design curve, fix the top pre-bent component to the top of the main frame structure, and make the top pre-bent component correspond to the design curve of the curved retaining wall;

[0061] S4: Fix the membrane clamp to the top pre-bent member and clamp the upper end of the membrane template so that the top pre-bent member fits the design curve of the curved retaining wall.

[0062] S5: Install an interlaced steel cable mesh structure on the inside of the membrane template;

[0063] S6: Install vertical steel pipe restraint components on the outside of the membrane template;

[0064] S7: Pour the curved retaining wall concrete and cure it. After the concrete has solidified, remove the steel pipe restraint components and the main frame structure. Remove or retain the membrane template and steel cable mesh structure according to the design requirements.

[0065] S8: Install the capping component on the top of the curved retaining wall, and backfill and compact the soil around the curved retaining wall in layers to complete the construction.

[0066] In this embodiment, the specific fixing process of the membrane template in S4 includes: clamping the membrane template with a membrane clamp, suspending the membrane template, and evenly unfolding it; gradually adjusting the tension of the membrane template to make the surface of the membrane template flat and conform to the design curve, thus completing the initial installation of the membrane template.

[0067] In this embodiment, in S5, the upper end of the steel cable mesh structure is fixed to the top of the main frame structure, and the lower end is connected to the foundation structure through anchors. The two sides of the steel cable mesh structure are fixed to the side members with steel cable fasteners. After the steel cable mesh structure is fixed, the tension of the steel cables is adjusted so that the membrane template is evenly stressed during the pouring process.

[0068] In this embodiment, in S6, the steel pipe constraint member includes multiple vertical steel pipes. The upper end of the steel pipe is connected to the main frame structure, and the lower end is fixed to the foundation structure. The lower end of the membrane template is installed on the steel pipe through the bottom constraint fastener.

[0069] In this embodiment, the concrete pouring process for the curved retaining wall in S7 is as follows:

[0070] Concrete of design grade with a slump of 80-150 mm was selected for construction.

[0071] The pouring process is carried out in layers, with each layer ranging from 300 to 500 millimeters in thickness.

[0072] After each layer is poured, it is vibrated to ensure that the concrete fills the membrane formwork evenly.

[0073] During the pouring process, the deformation of the membrane template is monitored in real time, and tension or support adjustments are made accordingly.

[0074] In this embodiment, in S7, if the membrane template and steel cable mesh structure are retained as the outer decorative layer of the curved retaining wall, they form a support for climbing plants and protect the wall from damage by plant roots; if the membrane template and steel cable mesh structure are removed, a curved retaining wall with a natural texture is formed. The membrane template uses PVC film or polyester fabric as a flexible template material.

[0075] Specifically, this embodiment provides a more detailed construction process:

[0076] (1) Construction preparation

[0077] First, the construction site is thoroughly cleaned and leveled, and precise lines are laid out to determine the location and outline of the retaining wall and mark the construction boundaries. At the same time, necessary construction preparations are carried out, including material procurement and equipment arrival, ensuring that equipment such as concrete mixers, vibrators, and measuring instruments are in place and usable. The construction site safety protection facilities are then completed.

[0078] (2) Pre-embedded side components, pre-embedded steel bars and foundation pouring

[0079] According to the design drawings, the internal steel mesh 3 is tied to form a steel cage that meets the design requirements; at the same time, side fixing components are pre-embedded at the foundation position for subsequent formwork fixing and connection; then the foundation wooden formwork 12 is erected, and the foundation concrete is poured in layers to ensure sufficient vibration and curing until the design strength is reached, and the construction of the foundation structure 5 is completed.

[0080] (3) Construction of main frame components

[0081] Precisely lay out the lines on top of the completed foundation structure, and construct the main frame component 1 using scaffolding steel pipes. The steel pipes are approximately 50 mm in diameter and connected with standard couplers. The vertical pipe spacing is controlled at 1000-1500 mm, and the horizontal pipe spacing is controlled at 800-1200 mm. After the frame is constructed, use a laser rangefinder or level to verify the overall verticality and stability of the main frame. If necessary, add diagonal bracing or reinforcements to enhance the structural rigidity. Pre-install drainage pipes 4 and light tubes 13 within the retaining wall reinforcement cage.

[0082] (4) Installation of upper fixing components

[0083] The top pre-bent component 6 is fabricated according to the design curve and installed on the top of the main frame component 1 to fix the membrane template 1 and the upper constraint fastener 7. During the installation process, the fixed position needs to be measured to ensure that the top pre-bent component 6 is consistent with the design curve. It is then firmly connected to the main frame component 1 using special connectors to complete the precise installation of the upper support.

[0084] (5) Installation of membrane template

[0085] High-strength and elastic PVC film or polyester fabric is selected as the flexible template material. When installing the membrane, the membrane clamp 8 is first fixed to the pre-bent top component 6 that has been installed, and the membrane is initially suspended so that it unfolds evenly from top to bottom. Then, the tension of the membrane is gradually adjusted. The membrane is ensured to be flat without obvious wrinkles and closely fits the design curve by means of a special tensioning device or manual adjustment.

[0086] (6) Steel cable restraint installation

[0087] An interlaced steel cable mesh structure is installed on the front of the membrane template 9. The steel cables are made of high-strength steel strands or steel wire ropes. The spacing between the steel cable mesh nodes is generally controlled between 200-400 mm. The upper end of the steel cable is firmly connected to the top of the main frame, and the lower end is connected to the foundation using anchors. The steel cables on the left and right sides are fixed to the side components using steel cable fasteners. By precisely controlling the tension of the steel cables, the membrane material can be evenly stressed during the pouring process, avoiding irregular deformation.

[0088] (7) Steel pipe confinement installation

[0089] Several steel pipe restraint components are vertically installed on the back of the membrane material. The steel pipes have a diameter of 20-50 mm and a spacing of 200-500 mm. The upper end of the steel pipe is firmly fixed to the top of the main frame structure via upper restraint fasteners 7, and the lower end is connected to the foundation using bolts or anchors. During installation, ensure that the steel pipes are precisely vertically aligned. The lower end of the membrane template 9 is fixed to the steel pipes via bottom restraint fasteners 12 to ensure rigid restraint and structural stability on the back of the membrane material during concrete pouring.

[0090] (8) Concrete pouring

[0091] Install a wooden formwork 2 behind the retaining wall, and use concrete of the design grade with a suitable slump (generally 80-150 mm) for construction. Concrete pouring adopts a layered construction process, with each layer controlled to a thickness of 300-500 mm. After each layer is poured, use an immersion vibrator or mechanical vibrator to thoroughly compact the concrete, ensuring uniform filling of the formwork and guaranteeing density and surface finish. Monitor formwork deformation in real time during pouring, and adjust tension or supports as needed.

[0092] (9) Template removal and surface treatment

[0093] After the concrete is poured, it shall be cured for no less than 7 days in accordance with the specifications to ensure that the concrete reaches the design strength. After the concrete has fully cured, the back steel pipe restraint and main frame structure shall be removed first, and the front membrane material and steel cable restraint shall be retained as a permanent external decorative layer to form a curved wall with natural texture. LED lights shall be installed inside the wall. Wiring 14.

[0094] (10) Follow-up processing and project acceptance

[0095] A concrete capping 15 is installed on top of the concrete retaining wall. The capping 15 can be made of precast or cast-in-place concrete, with an embedded space reserved to hide cable and steel cable joints, ensuring a smooth and aesthetically pleasing top finish. Subsequently, the soil around the wall is backfilled and compacted in layers to ensure uniform and stable soil stress. After all construction is completed, a strict final acceptance inspection is carried out, including dimensional accuracy, surface texture effect, and functional checks, to ensure that the project quality meets the design and specification requirements, and finally the construction process is completed.

[0096] Example 2

[0097] This embodiment is basically the same as the previous embodiment, except that, as follows: Figures 1 to 12 As shown, this embodiment provides a constraint component system for a membrane template of a curved retaining wall, which is used in a membrane template construction method for a cast-in-place concrete curved retaining wall according to Example 1. The components include a main frame component 1, a top pre-bent component 6, a membrane clamp 8, and a side constraint 10.

[0098] The main frame component 1 is fixed to the periphery of the curved retaining wall. The top pre-bent component 6 matches the design curve of the curved retaining wall and is fixed to the top of the main frame component 1. The top pre-bent component 6 and the cross-section of the curved retaining wall are located in the same vertical curved surface.

[0099] The membrane clamp 8 is installed on the top pre-bent member 6 for suspending the membrane template 9. The upper end of the side constraint 10 is fixed to the main frame member 1, and the lower end is installed on the foundation structure. The side constraint 10 abuts against the surface of the membrane template 9 to limit the deformation of the membrane template 9.

[0100] In this embodiment, the side constraint 10 includes a cable mesh structure and a steel pipe constraint member. The cable mesh structure is located on the side of the membrane template 9 closest to the retaining wall. The upper end of the cable mesh structure is fixed to the top of the main frame structure, and the lower end is connected to the foundation structure through anchors. The two sides of the cable mesh structure are fixed to the side members using cable fasteners. The steel pipe constraint member is located on the side of the membrane template 9 away from the retaining wall. The steel pipe constraint member includes multiple vertical steel pipes. The upper end of the steel pipes is connected to the main frame structure, and the lower end is fixed to the foundation structure. The lower end of the membrane template 9 is installed on the steel pipes through bottom constraint fasteners 11.

[0101] The function of lateral restraints is to limit the deformation of the formwork and ensure that it maintains its designed shape during concrete pouring. Lateral restraint itself is an abstract functional concept; this embodiment uses two different materials, steel pipes and steel cables, to illustrate the difference between rigid and flexible restraints. Lateral restraints are installed at the top and bottom of the membrane formwork to limit excessive expansion of the formwork during concrete pouring.

[0102] In this embodiment, the membrane template material is a high-strength flexible film or fabric with high elasticity and sufficient tensile strength, enabling it to undergo elastic deformation during concrete pouring. Commonly used membrane materials include PVC film and polyester fabric, which can adapt to the lateral pressure of concrete during pouring and ensure the geometry of the final component.

[0103] In this embodiment, the support frame serves as the skeleton of the formwork system, primarily composed of steel pipes, steel structural beams, or columns. The main frame components, consisting of steel pipes and beams, are installed on the periphery of the retaining wall, responsible for providing the necessary support for the membrane formwork and preventing excessive deformation or instability of the formwork during construction.

[0104] During the membrane material fixing process, multiple fixing points are set on the membrane template, and bolts, clasps, hooks and other connectors are used to firmly fix the membrane material to the support frame, ensuring that the template does not shift during concrete pouring and that the membrane template does not loosen during construction.

[0105] All construction materials for this fixing component, such as steel pipes, steel cables, and flexible membrane materials, are conventional and readily available materials on the construction site. Compared with the stringent requirement of strictly controlling the position of the reinforcing bars in order to accurately fix the tie rods in the tie rod constraint method in the prior art, the construction method of this invention is more flexible, easier to operate, and has more relaxed requirements for construction accuracy, effectively reducing the difficulty of construction and improving the convenience and efficiency of actual engineering implementation.

[0106] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A membrane formwork construction method for cast-in-place concrete curved retaining wall, characterized in that, The method comprises the following steps: S1: binding the base steel bars and the retaining wall steel bar cage, pouring the base concrete, and obtaining a base structure; S2: building a main frame structure on the top of the base structure, so that the main frame structure is enclosed in the periphery of the retaining wall; S3: manufacturing a top pre-bent component according to a design curve, fixing the top pre-bent component on the top of the main frame structure, and making the top pre-bent component correspond to the design curve of the curved retaining wall; S4: fixing a membrane clamping fixture on the top pre-bent component, clamping the upper end of the membrane template, and making the top pre-bent component fit the design curve of the curved retaining wall; S5: installing an interlaced woven steel cable grid structure on the inner side of the membrane template; S6: installing a vertical steel pipe constraint component on the outer side of the membrane template; S7: pouring the curved retaining wall concrete and curing, after the concrete solidifies, removing the steel pipe constraint component and the main frame structure, and removing or retaining the membrane template and the steel cable grid structure according to the design requirements; S8: installing a coping component on the top of the curved retaining wall, and layering and compacting the surrounding soil of the curved retaining wall, and completing the construction.

2. The membrane formwork construction method for cast-in-place concrete curved retaining wall according to claim 1, characterized in that, In S4, the specific fixing process of the membrane template comprises: clamping the membrane template by the membrane clamping fixture, suspending the membrane template, and uniformly unfolding; gradually adjusting the tension of the membrane template, so that the surface of the membrane template is flat and fits the design curve, and the preliminary installation of the membrane template is completed.

3. The membrane formwork construction method for cast-in-place concrete curved retaining wall according to claim 1, characterized in that, In S5, the upper end of the steel cable grid structure is fixed on the top of the main frame structure, and the lower end is connected to the base structure through an anchor, and the two sides of the steel cable grid structure are fixed on the side components by using a steel cable fastener; after the steel cable grid structure is fixed, the tension of the steel cable is adjusted, so that the membrane template is uniformly stressed during the pouring process.

4. The membrane formwork construction method for cast-in-place concrete curved retaining wall according to claim 1, characterized in that, In S6, the steel pipe constraint component comprises a plurality of vertical steel pipes, the upper end of the steel pipe is connected to the main frame structure, and the lower end is fixed on the base structure, and the lower end of the membrane template is installed on the steel pipe by a bottom constraint fastener.

5. The membrane formwork construction method for cast-in-place concrete curved retaining wall according to claim 1, characterized in that, In S7, the concrete pouring process of the curved retaining wall is as follows: Selecting a design grade concrete with a slump of 80-150 mm for construction; Using a layered construction process for pouring, and the pouring thickness of each layer is 300-500 mm; After each layer is poured, the concrete is vibrated to uniformly fill the membrane template; During the pouring process, the deformation of the membrane template is monitored in real time, and the tension or support is adjusted.

6. The membrane formwork construction method for cast-in-place concrete curved retaining wall according to claim 1, characterized in that, In S7, if the membrane template and the steel cable grid structure are retained as the outer decorative layer of the curved retaining wall, a support for climbing plants is formed; if the membrane template and the steel cable grid structure are removed, a curved retaining wall with natural texture is formed.

7. The membrane formwork construction method for cast-in-place concrete curved retaining wall according to claim 1, characterized in that, The membrane template (9) uses PVC film or polyester fabric as a flexible template material.

8. A restraint member system for a membrane formwork for a curved retaining wall, for use in a method of constructing a membrane formwork for a cast-in-place concrete curved retaining wall according to any one of claims 1 to 7, characterised in that, The component comprises a main frame component (1), a top pre-bent component (6), a membrane clamping fixture (8), and a side constraint (10); The main frame component (1) is fixed on the periphery of the curved retaining wall, the top pre-bent component (6) cooperates with the design curve of the curved retaining wall, and is fixed on the top of the main frame component (1), and the top pre-bent component (6) and the cross section of the curved retaining wall are located in the same vertical curve; The film material clamp (8) is installed on the top pre-bending component (6) for hanging the film material template (9), the upper end of the side restraint (10) is fixed on the main frame component (1), the lower end is installed on the base structure, the side restraint (10) abuts on the surface of the film material template (9) for limiting the deformation of the film material template (9).

9. A restraint system for curved retaining wall membrane panels according to claim 8, wherein, The side restraint (10) comprises a steel cable grid structure, the steel cable grid structure is arranged on the side of the film material template (9) close to the retaining wall, the upper end of the steel cable grid structure is fixed on the top of the main frame structure, and the lower end is connected with the base structure through an anchor, and the two sides of the steel cable grid structure are fixed on the side component through a steel cable fastener.

10. The restraint system of claim 8, wherein, The side restraint (10) comprises a steel pipe restraint component, the steel pipe restraint component is arranged on the side of the film material template (9) away from the retaining wall, the steel pipe restraint component comprises a plurality of vertical steel pipes, the upper end of the steel pipe is connected with the main frame structure, and the lower end is fixed on the base structure, and the lower end of the film material template (9) is installed on the steel pipe through a bottom restraint fastener (11).

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