Close splicing seam structure of close splicing cement-based steel bar truss plate

Abstract

The utility model relates to a dense splicing seam structure of a dense splicing cement-based steel bar truss plate, the upper end of one side of the dense splicing cement-based steel bar truss plate is provided with a tongue-and-groove, one section of a steel wire mesh is laid on the tongue-and-groove, and the other section of the steel wire mesh is prefabricated in the dense splicing cement-based steel bar truss plate; the middle of the carbon fiber gridding cloth is a dense fabric, and two sides are gridding cloth; when the two closely spliced cement-based steel bar truss plates are closely spliced, the carbon fiber gridding cloth covers the two steel wire meshes at the two rabbets, and the closely woven cloth completely covers a gap between the two steel wire meshes and a gap between the two closely spliced cement-based steel bar truss plates; a post-pouring concrete space is formed above the bottom face, covered by the gridding cloth, of the rabbet and above the dense woven cloth, and the post-pouring concrete layer is located in the space. The installation structure has the advantages of being not prone to slurry leakage, capable of preventing cracking and convenient to construct, and belongs to the installation technology of closely-spliced cement-based steel bar truss plates.

Description

Technical Field

[0001] This utility model relates to the installation technology of closely spaced cement-based steel truss panels, specifically to a closely spaced joint structure for closely spaced cement-based steel truss panels. Background Technology

[0002] Close-fitting cement-based reinforced steel truss slabs have become increasingly widely used in recent years as a substitute for ordinary composite slabs. Cement-based reinforced steel truss slabs refer to formwork-free floor slab products made of ultra-high performance concrete (UHPC), ordinary concrete (PC or HPC), or other cement-based materials connected to a steel truss to form a whole. However, close-fitting cement-based reinforced steel truss slabs have many joints, and grout leakage and cracking at these joints have become major problems in the application of this technology.

[0003] Existing seam structures have the following characteristics:

[0004] 1. Most joint treatment methods used for panel components are done on the underside of the panel. This method has the following disadvantages: (1) In actual construction, there are often supports and partial formwork underneath, which hinders the joint treatment. (2) After the supports are erected during construction, it is difficult to treat the bottom of the panel upwards.

[0005] 2. Common joint treatment methods typically employ a single approach using reinforcing bars, wire mesh, or reinforcing fabric. This method has the following drawbacks: it cannot simultaneously prevent cracking at the joints between two slabs and at the tongue-and-groove joints. In actual construction and use, cracks often occur at the joints between the two slabs, at the tongue-and-groove joints, and at the joints where on-site mortar is applied.

[0006] 3. Generally, when using mortar to repair tongue and groove joints, the mortar must reach its strength before the slab surface can be installed. Otherwise, factors such as overloading or vibration on the slab surface can cause cracks in the mortar joints. Therefore, this usually affects the construction period.

[0007] CN111364661A discloses a method and structure for connecting wide joints in lightweight floor slabs. During the construction of precast lightweight floor slabs, a groove is pre-reserved at the bottom of the joint end between two precast lightweight floor slabs, and the reinforcing mesh inside the two precast lightweight floor slabs extends a section beyond the joint end. When pouring the composite floor slab, firstly, the bottom of the wide joint between the two precast lightweight floor slabs is sealed using templates on the formwork system. Then, a set of tie rods connects the extended reinforcing mesh from the joint end of the two precast lightweight floor slabs into one unit, and a support frame supports the upper reinforcing mesh. Finally, the two precast lightweight floor slabs are connected into one unit by the composite floor slab poured on-site. This method suffers from the aforementioned problems (installation of lower templates, use of a single wire mesh treatment, and surface construction only allowed after the post-pouring composite floor slab reaches its design strength). Meanwhile, since the two precast lightweight floor slabs are not tightly joined, there is a certain width of post-cast connection strip between them. During subsequent use, shrinkage may occur, causing shrinkage between adjacent precast lightweight floor slabs or cracks to appear in the post-cast connection strip. Utility Model Content

[0008] In view of the technical problems existing in the prior art, the purpose of this utility model is to provide a close-fitting joint structure for a close-fitting cement-based steel truss slab that is not prone to grout leakage and cracking.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A close-fitting joint structure for a close-fitting cement-based steel truss slab includes a tongue and groove joint on the upper side of one side of the slab. One section of a wire mesh is laid on the tongue and groove joint, while the other section is prefabricated inside the slab. The carbon fiber mesh has a densely woven middle section and mesh sections on both sides. When two close-fitting cement-based steel truss slabs are joined together, the carbon fiber mesh covers the two wire meshes at the two tongue and groove joints, with the densely woven fabric completely covering the gaps between the two wire meshes and the gaps between the two slabs. A space for post-cast concrete is formed above the bottom surface of the tongue and groove joints covered by the mesh and above the densely woven fabric, and the post-cast concrete layer is located in this space.

[0011] As a preferred option, the tongue and groove joint is a rectangular notch located at one corner of a closely spaced cement-based steel truss plate.

[0012] As a preferred option, the wire mesh is set horizontally, with one section pre-embedded in the closely spaced cement-based steel truss slab during prefabrication.

[0013] As a preferred option, the carbon fiber mesh is connected to the steel wire mesh and the tongue-and-groove bottom surface by adhesive.

[0014] As a preferred option, the adhesive is a modified epoxy resin adhesive.

[0015] As a preferred option, carbon fiber mesh covers both tongue and groove joints completely.

[0016] This utility model has the following advantages:

[0017] A novel close-fitting joint structure is adopted, eliminating the need for formwork at the lower end of the truss panels, thus facilitating construction and work beneath the truss panels. The close-fitting structure between the two truss panels is equivalent to direct contact, eliminating the need for traditional post-cast connection strips and effectively reducing cracking issues in the post-cast concrete at the joints. Due to the close-fitting structure, there is no need to wait for the post-cast concrete layer to reach its strength before constructing the superstructure, accelerating the construction period. The carbon fiber mesh fabric has a tightly woven, non-leakage-prone core for effective sealing and prevention of grout leakage. The mesh fabric on both sides overlaps with the wire mesh, ensuring full contact between the post-cast concrete layer and the truss panel after pouring, forming a unified structure and providing excellent crack resistance.

[0018] Therefore, this close-fitting joint structure has the advantages of being less prone to grout leakage, preventing cracking, and facilitating construction. Attached Figure Description

[0019] Figure 1 This is a top view of the closely spaced seam structure.

[0020] Figure 2 This is the front view of the closely spaced seam structure.

[0021] Figure 3 This is a magnified view of the closely spaced joint structure before pouring.

[0022] Figure 4 This is a magnified view of the tightly joined joints of the concrete after pouring.

[0023] Figure 5 This is a structural diagram of wire mesh.

[0024] Figure 6 This is a schematic diagram of the structure of carbon fiber mesh fabric.

[0025] 1- Densely spliced ​​cement-based steel truss plate, 2- Tongue and groove, 3- Steel wire mesh, 4- Carbon fiber mesh, 5- Post-cast concrete layer, 6- Densely woven fabric, 7- Mesh fabric. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments.

[0027] A close-fitting joint structure for a close-fitting cement-based steel truss slab includes a tongue and groove joint on the upper side of one side of the slab. One section of a wire mesh is laid on the tongue and groove joint, while the other section is prefabricated inside the slab. The carbon fiber mesh has a densely woven middle section and mesh sections on both sides. When two close-fitting cement-based steel truss slabs are joined together, the carbon fiber mesh covers the two wire meshes at the two tongue and groove joints, with the densely woven fabric completely covering the gaps between the two wire meshes and the gaps between the two slabs. A space for post-cast concrete is formed above the bottom surface of the tongue and groove joints covered by the mesh and above the densely woven fabric, and the post-cast concrete layer is located in this space.

[0028] Tongue and groove is a rectangular notch located at one corner of a closely spaced cement-based steel truss slab.

[0029] The wire mesh is set horizontally, with one section pre-embedded in the closely spaced cement-based steel truss slab during prefabrication.

[0030] The carbon fiber mesh is connected to the steel wire mesh and the tongue and groove bottom surface by adhesive.

[0031] The adhesive is a modified epoxy resin.

[0032] Carbon fiber mesh covers both tongue and groove joints completely.

[0033] In this embodiment, two closely joined cement-based steel truss panels are joined together, with the gap between them determined by installation deviations and prefabrication tolerances of the precast components. The width of the densely woven fabric is selected based on actual conditions, ensuring no grout leakage. The mesh size of the wire mesh and the mesh fabric is selected based on actual conditions, allowing the subsequent concrete to pass through, thus forming a unified structure from the subsequent concrete layer, wire mesh, mesh fabric, and closely joined cement-based steel truss panels.

[0034] The construction method is as follows:

[0035] (1) Prefabricate closely spaced cement-based steel truss panels in the factory. During prefabrication, tongue and groove joints are reserved and steel wire mesh is pre-embedded.

[0036] (2) After hoisting the closely assembled cement-based steel truss plate on site, clean the tongue and groove joint and apply a layer of modified epoxy resin adhesive.

[0037] (3) Use a special roller to apply the carbon fiber mesh to the tongue and groove joint of the two truss panels. The densely woven fabric in the middle of the carbon fiber mesh faces the splicing gap, and the mesh fabric on both sides is used to overlap with the wire mesh. Since the densely woven fabric is directly glued to the wire mesh, or glued through the wire mesh to the bottom of the tongue and groove, it can be used to prevent grout leakage and prevent cracking at the splice. The mesh, wire mesh, and bottom of the tongue and groove are all firmly bonded together.

[0038] (4) Pour the concrete layer after pouring, such as Figure 4 As shown, the construction of the close-fitting joint structure has been completed.

[0039] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A close-joint structure for a close-jointed cement-based reinforced steel truss slab, characterized in that: A tongue and groove is opened at the upper end of one side of the closely spliced ​​cement-based steel truss slab. One section of the wire mesh is laid on the tongue and groove, and the other section is prefabricated inside the closely spliced ​​cement-based steel truss slab. The carbon fiber mesh is made of densely woven fabric in the middle and mesh fabric on both sides. When two closely spliced ​​cement-based steel truss slabs are joined together, the carbon fiber mesh covers the two wire meshes at the two tongue and groove joints. The densely woven fabric completely covers the gap between the two wire meshes and the gap between the two closely spliced ​​cement-based steel truss slabs. The space above the bottom surface of the tongue and groove covered by the mesh fabric and the space above the densely woven fabric are formed for the post-cast concrete, and the post-cast concrete layer is located in this space.

2. The close-joint structure of a close-joint cement-based reinforced steel truss slab according to claim 1, characterized in that: Tongue and groove is a rectangular notch located at one corner of a closely spaced cement-based steel truss slab.

3. The close-joint structure of a close-joint cement-based reinforced steel truss slab according to claim 1, characterized in that: The wire mesh is set horizontally, with one section pre-embedded in the closely spaced cement-based steel truss slab during prefabrication.

4. The close-joint structure of a close-joint cement-based reinforced steel truss slab according to claim 1, characterized in that: The carbon fiber mesh is connected to the steel wire mesh and the tongue and groove bottom surface by adhesive.

5. The close-joint structure of a close-joint cement-based reinforced steel truss slab according to claim 4, characterized in that: The adhesive is a modified epoxy resin.

6. The close-joint structure of a close-joint cement-based reinforced steel truss slab according to claim 1, characterized in that: Carbon fiber mesh covers both tongue and groove joints completely.

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