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CN-117779942-B - Fully-wrapped concrete truss structure and construction method thereof

CN117779942BCN 117779942 BCN117779942 BCN 117779942BCN-117779942-B

Abstract

The invention discloses a fully-wrapped concrete truss structure and a construction method thereof, wherein the fully-wrapped concrete truss structure comprises a steel pipe truss assembly, a wrapping assembly and a concrete layer, wherein the steel pipe truss assembly is arranged among a plurality of steel plates; the construction method comprises the following steps of S1, preparing an upper chord member, a lower chord member, a vertical rod and a cross rod, wrapping reinforcing nets, welding to obtain a steel pipe truss shell, S2, arranging a diagonal web member assembly inside the shell, forming steel pipe truss monomers after arranging a connecting net outside the shell, S3, connecting a plurality of monomers through bolts, connecting steel plates with the monomers at the edge through bolts to form a steel pipe truss structure, and S4, vibrating the steel pipe truss structure after concrete is cast in a partitioned mode to obtain the fully wrapped concrete truss structure. The invention can realize the full wrapping of the steel pipe, ensure the tight adhesion of the concrete layer and the steel pipe, and improve the stability and the safety of the structure.

Inventors

  • LIU ZHONG
  • LI BING
  • WU DI

Assignees

  • 电子科技大学

Dates

Publication Date
20260512
Application Date
20240130

Claims (9)

  1. 1. The fully-wrapped concrete truss structure comprises a plurality of steel plates (1), a steel pipe truss assembly (2) arranged among the steel plates (1), a wrapping assembly arranged outside the steel pipe truss assembly (2), and a concrete layer arranged outside the wrapping assembly, and is characterized in that, The steel pipe truss assembly (2) is formed by connecting a plurality of steel pipe truss monomers (3), the steel pipe truss monomers (3) comprise a plurality of upper chords (31), a plurality of lower chords (32) which are arranged opposite to the upper chords (31), vertical rods (used for connecting the upper chords (31) and the lower chords (32), and a plurality of diagonal web member assemblies (34) which are arranged between the upper chords (31) and the lower chords (32), wherein the diagonal web member assemblies (34) are connected with fixing rod assemblies (35), and transverse rods (36) are arranged between the upper chords (31) and the lower chords (32); the joints of the upper chords (31) and the vertical rods (33) are provided with upper nodes, and the joints of the lower chords (32) and the vertical rods (33) are provided with lower nodes; the diagonal web member assembly (34) comprises a first upper diagonal web member (341) and a second upper diagonal web member (342) connected with the upper node, and a first lower diagonal web member (343) and a second lower diagonal web member (344) connected with the lower node; The wrapping assembly comprises an upper wrapping net arranged outside the first upper diagonal web member (341) and the second upper diagonal web member (342), a lower wrapping net arranged outside the first lower diagonal web member (343) and the second lower diagonal web member (344), a first reinforcing net arranged outside the upper chord member (31) and the lower chord member (32), and a second reinforcing net arranged outside the vertical rod (33) and the cross rod (36); The fixation rod assembly (35) comprises a side fixation rod (351) connected to the first upper diagonal web member (341) and the first lower diagonal web member (343), an upper fixation rod (352) connected to the second upper diagonal web member (342), and a lower fixation rod (353) connected to the second lower diagonal web member (344).
  2. 2. The fully encased concrete truss structure of claim 1, wherein the upper chord (31), the lower chord (32), the vertical bar (33) and the cross bar (36) are equal in length, and the first upper diagonal web member (341), the second upper diagonal web member (342), the first lower diagonal web member (343) and the second lower diagonal web member (344) are equal in length.
  3. 3. A fully encased concrete truss structure as claimed in claim 2 wherein the length relationship of the first upper diagonal web member (341) and the upper chord member (31) is Wherein S is the length of the upper chord member (31), and L is the length of the first upper diagonal web member (341).
  4. 4. The fully-wrapped concrete truss structure according to claim 1, wherein the first upper diagonal web member (341) is inclined from the upper node to the inside of the steel pipe truss assembly (2), the first lower diagonal web member (343) is inclined from the lower node to the inside of the steel pipe truss assembly (2), and the included angles with the vertical rods (31) are all 35-40 degrees and 45-50 degrees and the included angles with the cross bars (36) are all 45-50 degrees.
  5. 5. The fully-wrapped concrete truss structure according to claim 1, wherein the second upper diagonal web member (342) is inclined from the upper node to the inside of the steel pipe truss assembly (2), the second lower diagonal web member (344) is inclined from the lower node to the inside of the steel pipe truss assembly (2), and the angles between the second upper diagonal web member and the vertical rods (33) are 50-55 degrees, between the second upper diagonal web member and the upper chord member (31) are 35-40 degrees, and between the second lower diagonal web member and the transverse rods (36) are 35-40 degrees.
  6. 6. The fully wrapped concrete truss structure according to claim 1, wherein the upper wrapping mesh and the lower wrapping mesh are glass fiber mesh, the pore diameter is 10-20 mm, the fiber mesh is diamond-shaped, and the fiber diameter is 2-3 mm.
  7. 7. The fully encased concrete truss structure of claim 1, wherein the first reinforcing mesh and the second reinforcing mesh are both high strength fiberglass mesh, the pore size is 5-10 mm, the fiber mesh is square, and the fiber diameter is 4-4.5 mm.
  8. 8. Construction method based on a fully encased concrete truss structure according to any one of claims 1-7, characterized in that it comprises the following steps: s1, preparing an upper chord member (31), a lower chord member (32), a vertical rod (33) and a cross rod (36), wrapping reinforcing nets outside, welding the reinforcing nets into a three-dimensional structure, and arranging nodes at intersecting points to obtain a steel pipe truss shell; S2, arranging a diagonal web member assembly (34) inside the steel pipe truss shell, arranging wrapping nets outside the diagonal web member assembly (34) and welding a fixed rod assembly (35), and forming a steel pipe truss single body (3) after arranging a connecting net outside the steel pipe truss shell; s3, connecting a plurality of steel pipe truss monomers (3) through bolts, and connecting a plurality of steel plates (1) with the steel pipe truss monomers (3) at the edge through bolts to form a steel pipe truss structure; and S4, coating adhesives on the surfaces of the reinforcing net, the wrapping net and the connecting net, pouring concrete on the steel pipe truss structure in a partitioned manner, continuously pulping to remove gaps in the pouring process, vibrating by using a vibrating plate after pouring, and removing the mould and finishing the surface after the concrete is initially fixed to obtain the fully-wrapped concrete truss structure.
  9. 9. The method of constructing a fully encased concrete truss structure of claim 8 wherein in S4, the adhesive used is one of an epoxy adhesive, a polyurethane adhesive and an acrylate adhesive.

Description

Fully-wrapped concrete truss structure and construction method thereof Technical Field The invention relates to the technical field of reinforced concrete, in particular to a fully-wrapped concrete truss structure and a construction method thereof. Background Along with the development of technology and the requirements of engineering construction, the requirements on building materials are also higher and higher. Concrete is widely used in various structures as a conventional construction material due to its excellent mechanical properties and durability. Truss structures are a common form of building construction consisting of a number of straight bars connected together by nodes. Although truss structures have many advantages, such as simple structure, high bearing capacity, good stability and the like, the truss structure has some disadvantages that the rod members mainly bear axial tensile and compressive stress, the lateral rigidity is relatively small, the lateral deformation is easy to occur, and meanwhile, the rod members of the truss structure are generally made of square steel pipes or reinforced concrete and the like, so that the bearing capacity and the durability of the truss structure are limited by the materials. When the steel pipe truss is combined with concrete to be used and subjected to pressure, the cross section of the steel pipe can be reduced, meanwhile, the steel pipe truss in the prior art cannot be fully wrapped with the concrete, water evaporation and chemical reaction can occur in the hardening process of the concrete, shrinkage deformation of the concrete is difficult to control, shrinkage rates of different parts of the concrete can be uneven, microcracks and gaps exist in the concrete, the concrete cannot work together with the steel pipe when the concrete is stressed, and uneven stress or premature local damage of the steel pipe can be caused. Disclosure of Invention The invention overcomes the defects of the prior art and provides a fully-wrapped concrete truss structure and a construction method thereof. In order to achieve the aim, the technical scheme adopted by the invention is that the fully-wrapped concrete truss structure comprises a plurality of steel plates, a steel pipe truss assembly arranged among the steel plates, a wrapping assembly arranged outside the steel pipe truss assembly and a concrete layer arranged outside the wrapping assembly, and is characterized in that, The steel pipe truss assembly is formed by connecting a plurality of steel pipe truss monomers, wherein each steel pipe truss monomer comprises a plurality of upper chords, a plurality of lower chords which are arranged opposite to the upper chords, vertical rods used for connecting the upper chords and the lower chords, and a plurality of diagonal web members arranged between the upper chords and the lower chords; the joints of the upper chords and the vertical rods are provided with upper nodes, and the joints of the lower chords and the vertical rods are provided with lower nodes; the diagonal web member assembly comprises a first upper diagonal web member and a second upper diagonal web member which are connected with the upper node, and a first lower diagonal web member and a second lower diagonal web member which are connected with the lower node; the wrapping assembly comprises an upper wrapping net arranged outside the first upper diagonal web member and the second upper diagonal web member, a lower wrapping net arranged outside the first lower diagonal web member and the second lower diagonal web member, a first reinforcing net arranged outside the upper chord member and the lower chord member, and a second reinforcing net arranged outside the vertical rod and the cross rod. In a preferred embodiment of the present invention, the fixing rod assembly includes a side fixing rod connected to the first upper diagonal web member and the first lower diagonal web member, an upper fixing rod connected to the second upper diagonal web member, and a lower fixing rod connected to the second lower diagonal web member. In a preferred embodiment of the present invention, the lengths of the upper chord member, the lower chord member, the vertical rod and the transverse rod are equal, and the lengths of the first upper diagonal web member, the second upper diagonal web member, the first lower diagonal web member and the second lower diagonal web member are equal. In a preferred embodiment of the present invention, the length relationship between the first upper diagonal member and the upper chord member isWherein S is the length of the upper chord member, and L is the length of the first upper diagonal web member. In a preferred embodiment of the present invention, the inclination direction of the first upper diagonal member is from the upper node to the inside of the steel pipe truss assembly, the inclination direction of the first lower diagonal member is from the lower node to the inside of the stee