Fabricated truss type steel pipe concrete support formwork and method

Abstract

An assembled truss type steel pipe concrete support formwork, in particular to a steel pipe concrete structure support formwork used in the field of roadway and tunnel support and a manufacturing method thereof. The support formwork comprises a steel pipe concrete truss module, a steel pipe concrete truss module assembly joint, a buckling-restrained brace, a buckling-restrained brace orthogonal joint and a truss outrigger. Through the assembled combination of different prefabricated components, the wet work load in the roadway and tunnel can be effectively reduced, the construction period can be greatly shortened, and a roadway and tunnel support formwork structure with high safety, economy and practicability, simple construction, green environmental protection, high efficiency and stress and recyclability is formed. The application has important application value and social and economic benefits in solving the key technical problems of high cost, high construction difficulty, weak stress performance and poor practicability of the traditional support mode in deep roadway and tunnel. It is suitable for popularization and application in the field of roadway and tunnel support, especially in the field of deep roadway and tunnel support.

Description

Technical fields:

[0001] This invention belongs to the field of support structures, specifically relating to a prefabricated steel pipe concrete support formwork and its manufacturing method for roadway and tunnel support. Background technology:

[0002] Currently, coal remains my country's primary energy source. With continued coal mining, shallow coal resources are decreasing year by year, and coal mining is gradually shifting towards deeper layers. Simultaneously, with the use of larger tunneling and mining equipment, the cross-sectional area of ​​roadways is increasing. Therefore, the theory and technology of deep roadway support have become core aspects of deep rock strata control, placing increasingly higher demands on the load-bearing performance of support structures. Traditional roadway support systems, such as masonry arch support, metal support, and reinforced concrete support, often suffer from insufficient load-bearing capacity, excessive space occupation by the support structure, and high material and construction costs when applied to deep roadways. Meanwhile, with the increasing mileage of subways and railways in my country and the growing volume of tunnel excavation, the demand for high-performance tunnel support structures is becoming increasingly prominent. In steel-concrete composite structures, the steel pipe provides excellent confinement to the concrete, effectively improving the strength and ductility of the internal concrete. Therefore, steel-concrete composite structures have been widely used in above-ground buildings. However, their application in underground support structures is relatively limited, and research is still in its early stages. Moreover, there is currently little research on the differences in stress states between above-ground and underground structures, and the material utilization rate of steel-concrete composite structures in underground support structures is low, making it difficult to fully realize their performance.

[0003] Therefore, developing a prefabricated steel pipe concrete support formwork that is efficient in load-bearing, economical, easy to construct, and environmentally friendly is of great safety significance and socio-economic value for deep roadway and tunnel excavation. Summary of the Invention:

[0004] The purpose of this invention is to propose an economical, practical, simple to construct, environmentally friendly, and highly efficient prefabricated truss-type steel pipe concrete support formwork. This aims to solve the key technical problems of high cost, difficult construction, weak load-bearing capacity, and poor practicality of traditional support methods in deep roadways and tunnels.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A prefabricated truss-type steel-concrete composite support formwork includes a steel-concrete composite truss module (1), module assembly nodes (2), buckling-restrained braces (3), buckling-restrained brace orthogonal nodes (4), and truss outriggers (5). The steel-concrete composite truss module (1) consists of an outer chord (11), an inner chord (12), and web members (13). The module assembly node (2) consists of a node plate (21), bolts (22), and sleeves (23). The buckling-restrained brace orthogonal node (4) consists of an orthogonal node plate (41) and orthogonal bolts (42). The truss outrigger (5) consists of a sleeve (51) and an outrigger rod (52). By combining different prefabricated components in a prefabricated manner, the amount of wet work in the roadway can be effectively reduced, and even zero wet work can be achieved, greatly shortening the construction period. At the same time, the support formwork in areas where no significant rock deformation has occurred can be recycled. It is a high-efficiency, recyclable, and reusable support formwork structure for deep roadways and tunnels.

[0007] The prefabricated truss-type steel pipe concrete support formwork is characterized by:

[0008] The steel-concrete composite truss module (1) is prefabricated in the factory and is in the shape of an arc or a broken line, so as to adapt to different shapes of roadways or tunnels. The outer chord (11) and inner chord (12) are made of steel-concrete composite components, and the web members (13) can be made of steel-concrete composite components, steel pipe components or steel profile components.

[0009] The steel tube concrete truss modules (1) are connected by the module assembly nodes (2). The module assembly nodes (2) are set at the connection between the inner chord and the web members, and at the middle of the adjacent connection between the outer chord and the web members. The steel tube concrete truss module assembly nodes (2) can be bolted hinge nodes, or the inner chord can be bolted hinged and the outer chord can be connected by steel tube sleeves to further save assembly and construction time.

[0010] Buckling-restrained bracing (3) is installed between adjacent formwork frames. Buckling-restrained bracing (3) can be made of steel, steel pipe or steel-concrete composite components. The orthogonal nodes (4) of the buckling-restrained bracing are set at the connection between the chord and web members of the steel-concrete composite truss module. The orthogonal nodes (4) of the buckling-restrained bracing are orthogonal in the rotation direction between two adjacent steel-concrete composite trusses, thereby reducing the impact of deformation of one formwork frame on adjacent formwork frames.

[0011] A truss cantilever (5) is set at the connection position between the outer chord and the web member of the steel pipe concrete truss module (1). The cantilever rod (52) can be made of steel pipe concrete, steel section or steel bar, and can be selectively inserted into part or all of the sleeve (51) to adapt to different rock mass deformations.

[0012] The construction method of the prefabricated truss-type steel pipe concrete support formwork is characterized by the following requirements in the manufacturing method:

[0013] 1) The steel tube concrete truss module (1) is prefabricated in the factory, and the node plate (21) in the module assembly node (2), the orthogonal node plate (41) in the buckling-restrained brace orthogonal node (4) and the sleeve (51) in the truss cantilever (5) are pre-welded to the steel tube concrete truss module (1);

[0014] 2) Connect the steel pipe concrete truss modules (1) through the module assembly nodes (2) to form a support formwork frame;

[0015] 3) Connect the adjacent support formwork to the buckling-restrained brace (3) through the buckling-restrained brace node (4);

[0016] 4) Depending on the actual deformation of the rock mass, the outrigger (52) may be selectively installed in some or all of the sleeves (51).

[0017] The present invention can yield the following benefits:

[0018] (1) The structure adopts fully prefabricated construction. All parts are prefabricated in the factory, which can better ensure the structural stress performance and dimensional accuracy. It can greatly reduce the on-site operation time in the well, effectively save costs, and greatly improve the safety of the well construction. At the same time, for sections with small rock mass deformation, the formwork can be disassembled and reused.

[0019] (2) The main load-bearing components are made of steel-concrete composite, which greatly improves the load-bearing performance. This can reduce the amount of material used and meet the load-bearing performance requirements of the support formwork in deep roadways and tunnels.

[0020] (3) The cantilever rod (52) in the truss can be selectively arranged according to the specific deformation of the rock mass in the roadway or tunnel. This can ensure that the entire support structure is subjected to uniform external load, reduce the problem of local stress concentration, save material usage, and reduce workload.

[0021] (4) Through an innovative construction method, different parts are combined into a spatial truss-type formwork that can share the load, resulting in efficient load-bearing. At the same time, the fully prefabricated construction method greatly accelerates the construction speed and has good recyclability, generating good economic benefits.

[0022] (5) This invention is economical and effective, simple to construct, and suitable for application in the field of roadway and tunnel support, especially in the field of deep roadway and tunnel support. Attached image description:

[0023] Figure 1 This is an overall rendering of the prefabricated truss-type steel pipe concrete support formwork.

[0024] Figure 2This is a detailed drawing of the steel-concrete composite truss module (1);

[0025] Figure 3 This is a detailed view of module assembly node (2);

[0026] Figure 4 This is a detailed diagram of the orthogonal node (4) of the buckling-resistance brace;

[0027] Figure 5 This is a detailed drawing of the truss outrigger (5). Detailed implementation method:

[0028] To better understand the present invention, the following description, in conjunction with a typical embodiment, further clarifies the content of the present invention.

[0029] As attached Figure 1 This refers to a circular prefabricated truss-type steel-concrete composite support formwork formed by four steel-concrete composite truss modules (1) when the truss module (1) is a quarter circle. It includes the steel-concrete composite truss module (1), and... Figure 2 ; Module assembly node (2), attached Figure 3 Buckling brace (3), see appendix Figure 1 ; buckling-restrained brace orthogonal node (4), attached Figure 4 ; Truss outrigger (5), attached Figure 5 .

[0030] The steel-concrete composite truss module (1) is prefabricated in the factory and can be circular or polygonal. In this typical implementation scheme, a quarter circle is used. The outer chord (11) and inner chord (12) are made of steel-concrete composite members, and the web members (13) can be made of steel-concrete composite members, steel pipe members, or steel profile members. In this typical implementation scheme, circular steel-concrete composite members are used.

[0031] The steel-concrete truss modules (1) are connected into a circular formwork through modular assembly nodes (2). The modular assembly nodes (2) are located at the junctions of the inner chord and web members, and at the midpoints of the adjacent junctions of the outer chord and web members. The modular assembly nodes (2) of the steel-concrete truss can be fully bolted hinge nodes, meaning that both the inner and outer chords are connected through bolted hinge nodes. Figure 3 (a); or the inner chord is connected by bolted hinges, and the outer chord is connected by steel pipe sleeves. Figure 3 (b) This typical implementation method uses a fully bolted hinge joint.

[0032] Buckling-restrained braces (3) are installed between adjacent formworks. The buckling-restrained braces (3) can be made of steel sections, steel pipes, or steel-concrete composite members. In this typical scheme, circular steel-concrete composite members are used. The orthogonal nodes (4) of the buckling-restrained braces are set at the connection between the inner and outer chords and web members of the steel-concrete composite truss module. The rotation direction of the orthogonal nodes (4) of the buckling-restrained braces is orthogonal between two adjacent steel-concrete composite truss modules, thereby effectively reducing the impact of the deformation of one support structure on the adjacent support structure.

[0033] The truss outrigger (5) is set at the junction of the outer chord and the web members of the steel-concrete truss module (1). The outrigger (52) does not need to be installed all at once. It can be selectively installed according to the actual deformation position of the rock mass during actual use.

[0034] The prefabricated truss-type steel pipe concrete support formwork is characterized by the following requirements in its manufacturing method:

[0035] 1) The steel tube concrete truss module (1) is prefabricated in the factory, and the node plate (21) in the module assembly node (2), the orthogonal node plate (41) in the buckling-restrained brace orthogonal node (4) and the sleeve (51) in the truss cantilever (5) are pre-welded to the steel tube concrete truss module (1);

[0036] 2) Connect the steel pipe concrete truss modules (1) through the module assembly nodes (2) to form a support formwork frame;

[0037] 3) Connect the adjacent support formwork to the buckling-restrained brace (3) through the buckling-restrained brace node (4);

[0038] 4) Depending on the actual deformation of the rock mass, the outrigger (52) may be selectively installed in some or all of the sleeves (51).

[0039] The above is a typical embodiment of the present invention, but the implementation of the present invention is not limited thereto. The structural dimensions and materials listed in the present invention can be selected according to actual needs, and will not be listed one by one here.

Claims

1. A prefabricated truss-type steel-concrete composite support formwork, comprising a steel-concrete composite truss module (1), a module assembly node (2), a buckling-restrained brace (3), a buckling-restrained brace orthogonal node (4), and a truss cantilever (5); the steel-concrete composite truss module (1) is composed of an outer chord (11), an inner chord (12), and a web member (13); the module assembly node (2) is composed of a node plate (21), bolts (22), and a first sleeve (23); the buckling-restrained brace (3) is set between adjacent formworks and is made of steel, steel pipe, or steel-concrete composite components; the buckling-restrained brace orthogonal node (4) is composed of an orthogonal node plate (41) and orthogonal bolts (42), and is set at the connection between the chord and web member of the steel-concrete composite truss module (1), with the rotation direction orthogonal between two adjacent steel-concrete composite truss modules; the truss cantilever (5) is composed of a second sleeve (51) and a cantilever rod (52).

2. The prefabricated truss-type steel pipe concrete support formwork according to claim 1, characterized in that: The steel-concrete composite truss module (1) is prefabricated in the factory and is in the shape of an arc or a broken line. The outer chord (11) and inner chord (12) are made of steel-concrete composite components, and the web members (13) are made of steel-concrete composite components, steel pipe components or steel profile components.

3. The prefabricated truss-type steel pipe concrete support formwork according to claim 1, characterized in that: The steel tube concrete truss modules (1) are connected by the module assembly nodes (2); the module assembly nodes (2) are set at the middle of the connection between the inner chord and the web members, and the adjacent connection between the outer chord and the web members; all module assembly nodes (2) are connected by node plates (21) and bolts (22), or the inner chord is connected by node plates (21) and bolts (22), and the outer chord is connected by the first sleeve (23).

4. The prefabricated truss-type steel pipe concrete support formwork according to claim 1, characterized in that: A truss cantilever (5) is set at the connection position between the outer chord and the web member of the steel tube concrete truss module (1); the cantilever (52) is made of steel tube concrete, steel section or steel bar, and is selectively inserted into part or all of the second sleeve (51).

5. A prefabricated truss-type steel pipe concrete support formwork according to claim 1, characterized in that... The production method includes the following requirements: 1) The steel tube concrete truss module (1) is prefabricated in the factory, and the node plate (21) in the module assembly node (2), the orthogonal node plate (41) in the buckling-restrained brace orthogonal node (4) and the second sleeve (51) in the truss cantilever (5) are pre-welded to the steel tube concrete truss module (1); 2) Connect the steel pipe concrete truss modules (1) through the module assembly nodes (2) to form a support formwork frame; 3) Connect the adjacent support formwork to the buckling-restrained brace (3) through the buckling-restrained brace orthogonal node (4); 4) Selectively install the extension arm (52) in part or all of the second sleeve (51).

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