Support-free abutted seam structure for precast concrete laminated slab construction

Abstract

The utility model discloses a support-free abutted seam structure for precast concrete laminated slab construction, and belongs to the technical field of constructional engineering. The prefabricated concrete composite slab is arranged in an abutted seam of adjacent prefabricated concrete composite slabs, each prefabricated concrete composite slab comprises a prefabricated concrete bottom slab and a post-pouring concrete layer, connecting steel bars are arranged between the abutted seams of the prefabricated concrete bottom slabs, and the connecting steel bars are covered with UHPC concrete in a pouring mode. The connecting steel bars and the UHPC are used for connecting the adjacent prefabricated concrete bottom plates, the prefabricated concrete bottom plates are formed by pouring steel fiber concrete, and a U-shaped concrete fence is poured at the end, located at the abutted seam, of at least one adjacent prefabricated concrete bottom plate. And the U-shaped concrete fence is used as a template for pouring UHPC (Ultra High Performance Concrete). According to the technical scheme, the problem that a temporary supporting jig frame needs to be arranged when an existing laminated slab is constructed is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building engineering, and in particular relates to a support-free joint structure for the construction of prefabricated concrete composite panels. Background Art

[0002] During the construction of cast-in-place buildings, temporary supports are "indispensable" because the cast-in-place structure cannot completely rely on itself to bear the weight or maintain stability before it is formed. It is usually necessary to set up temporary supports in advance during the installation phase. After the structure is installed, these temporary supports are removed in a predetermined method and sequence.

[0003] However, in prefabricated buildings, temporary supports are not so "indispensable". Because the prefabricated horizontal components of prefabricated buildings have a certain degree of rigidity after being produced and maintained in the factory before being assembled on the construction site. If the prefabricated bottom plate only serves as the formwork for cast-in-place concrete in the superimposed layer during the construction process, the bearing capacity of the prefabricated components cannot be fully utilized. In addition, the labor and material consumption required for temporary supports are large, which increases construction costs, prolongs the construction period, affects the progress of the construction period, and also affects the construction work surface, resulting in a waste of resources. In other words, setting up temporary supports in prefabricated buildings violates the original intention of green construction and energy conservation. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a support-free joint structure for the construction of precast concrete composite panels, so as to solve the problem that a temporary support frame needs to be set up during the construction of existing composite panels.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] The utility model discloses a support-free joint structure for the construction of precast concrete composite slabs, which is arranged in the joints of adjacent precast concrete composite slabs, the precast concrete composite slabs comprising a precast concrete base plate and a post-cast concrete layer, connecting steel bars are arranged between the joints of the precast concrete base plates, the connecting steel bars are cast and covered with UHPC concrete, the connecting steel bars and the UHPC concrete are used to connect adjacent precast concrete base plates, the precast concrete base plates are cast by steel fiber concrete, a U-shaped concrete enclosure is cast on one end of at least one of the adjacent precast concrete base plates located at the joint, the U-shaped concrete enclosure is used as a template for casting UHPC concrete, both sides of the U-shaped concrete enclosure are arranged flush with the two side surfaces in the width direction of the precast concrete base plate, the closed end of the U-shaped concrete is arranged flush with the lower surface of the precast concrete base plate, and the open end of the U-shaped concrete is arranged flush with the upper surface of the precast concrete base plate.

[0007] Furthermore, the precast concrete bottom plate is provided with a plurality of longitudinal steel bars evenly distributed along the length direction and a plurality of transverse steel bars evenly distributed along the width direction.

[0008] Furthermore, a plurality of evenly distributed steel bar trusses are provided in the upper surface of the precast concrete bottom plate.

[0009] Furthermore, U-shaped bends are provided on the ends of a plurality of longitudinal steel bars located at the joints of the adjacent precast concrete bottom plates, the U-shaped bends on the adjacent precast concrete plates are arranged in contact, and the connecting steel bars are located inside the U-shaped bends.

[0010] Furthermore, the connecting steel bars are tied to the U-shaped bend by means of binding wires.

[0011] Furthermore, the UHPC concrete contains a plurality of uniformly distributed steel fibers.

[0012] The beneficial effects of the utility model are:

[0013] The precast concrete composite slab in this technical solution better integrates the characteristics of cast-in-place concrete structure and prefabricated assembled structure. In the case of large span, there is no need to set up a supporting frame. At the same time, the setting of the joint structure increases the deformation resistance of the composite slab joints, reduces the deflection value of the composite slab during the construction stage, and enhances the integrity and rigidity of the composite slab.

[0014] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0016] Figure 1 It is a three-dimensional schematic diagram of the support-free structure of the utility model being arranged at the joint;

[0017] Figure 2 It is a schematic diagram of an exploded view of the support-free structure of the utility model;

[0018] Figure 3 for Figure 2 A local enlarged schematic diagram of point A in the middle.

[0019] The following are marked in the accompanying drawings:

[0020] 1. Precast concrete slab; 2. Steel truss; 3. Transverse steel bars; 4. U-shaped bend; 5. UHPC concrete; 6. U-shaped concrete enclosure; 7. Connecting bars; 8. Longitudinal steel bars. DETAILED DESCRIPTION

[0021] like Figure 1 to Figure 3 As shown, the utility model is a support-free joint structure for the construction of precast concrete composite slabs, which is arranged in the joints of adjacent precast concrete composite slabs. Since the precast concrete composite slabs include a precast concrete base plate 1 and a post-cast concrete layer, connecting steel bars are arranged between the joints of the precast concrete base plate 1. The arrangement of the connecting steel bars can be understood as a rebar planting operation during pouring. UHPC concrete 5 is poured and covered on the connecting steel bars. The joint connection structure formed by the combination of the connecting steel bars and the UHPC concrete 5 is used to connect the adjacent precast concrete base plates 1. When the precast concrete base plate 1 is manufactured, the poured concrete is steel fiber concrete. A U-shaped concrete enclosure 6 is poured on one end of the adjacent at least one precast concrete base plate 1 at the joint. The U-shaped concrete enclosure 6 is used as a template for pouring UHPC concrete 5. The two sides of the U-shaped concrete enclosure 6 are flush with the two side surfaces in the width direction of the precast concrete base plate 1, the closed end of the U-shaped concrete is flush with the lower surface of the precast concrete base plate 1, and the open end of the U-shaped concrete is flush with the upper surface of the precast concrete base plate 1.

[0022] UHPC concrete 5 has a compressive and tensile strength far exceeding that of traditional concrete, which greatly improves the bearing capacity of the connection points and ensures the safety and reliability of the structure. The low porosity and high density of UHPC concrete 5 give it excellent corrosion resistance and freeze-thaw cycle resistance, which can extend the service life of the connection parts and reduce maintenance requirements.

[0023] UHPC concrete 5 typically contains steel fibers, which increases its ability to deform before breaking, improving the performance of the structure under earthquake or impact loads. The bonding effect of UHPC concrete 5 to the surface of precast components is generally better than that of ordinary concrete, which means better interface bonding and stress transfer. UHPC concrete 5 has good fluidity and can accurately fill the gaps in the joints to ensure the tightness and sealing of the connections. Due to the high-strength characteristics of UHPC concrete 5, the need for additional metal connectors may be reduced, simplifying the construction process and reducing costs. The fast-hardening characteristics of UHPC concrete 5 allow precast components to reach sufficient strength in a shorter period of time, thereby accelerating subsequent processes.

[0024] The strong UHPC concrete 5 connects the joints between adjacent precast concrete composite panels, which can enhance the collaborative work between the precast base plates, so that the integrity and stability of the entire structure are strengthened. That is, in the later stage of assembly under large span conditions, the precast concrete base plate 1 in the present technical solution can play a supporting role, and subsequent pouring operations can be carried out without setting up a tire frame, which not only meets the green construction requirements but also greatly improves the construction efficiency.

[0025] In one feasible manner, a plurality of longitudinal steel bars 8 evenly distributed along the length direction and transverse steel bars 3 evenly distributed along the width direction are provided in the precast concrete base plate 1, and a plurality of evenly distributed steel bar trusses 2 are also provided in the upper surface of the precast concrete base plate 1. The transverse steel bars 3, longitudinal steel bars 8 and steel bar trusses 2 are provided to enhance the strength and toughness of the composite plate after casting.

[0026] In one feasible manner, a U-shaped bend 4 is provided on the end of a plurality of longitudinal steel bars 8 located at the joint of adjacent precast concrete base plates 1, the U-shaped bends 4 on adjacent precast concretes are arranged in contact, and the connecting steel bars are located inside the U-shaped bend 4, and the connecting steel bars are tied to the U-shaped bend 4 by means of wire tying. By arranging the connecting rib 7 inside the U-shaped bend 4, the force transmission effect and contact effect at the contact portion between the connecting steel bars and the U-shaped bend 4 can be improved, thereby improving the force bearing effect and bending strength at the joint.

[0027] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A support-free joint structure for precast concrete composite slab construction, characterized in that: The invention relates to a precast concrete composite slab, wherein the precast concrete composite slab comprises a precast concrete base plate (1) and a post-cast concrete layer. Connecting steel bars are arranged between the joints of the precast concrete base plates (1). UHPC concrete (5) is cast and covered on the connecting steel bars. The connecting steel bars and the UHPC concrete (5) are used to connect the adjacent precast concrete base plates (1). The precast concrete base plates (1) are cast from steel fiber concrete. A U-shaped concrete enclosure (6) is cast on one end of at least one of the adjacent precast concrete base plates (1) at the joint. The U-shaped concrete enclosure (6) is used as a template for casting the UHPC concrete (5). The two sides of the U-shaped concrete enclosure (6) are arranged flush with the two side surfaces of the precast concrete base plate (1) in the width direction. The closed end of the U-shaped concrete is arranged flush with the lower surface of the precast concrete base plate (1), and the open end of the U-shaped concrete is arranged flush with the upper surface of the precast concrete base plate (1).

2. The support-free joint structure for precast concrete composite slab construction according to claim 1, characterized in that: The precast concrete base plate (1) is provided with a plurality of longitudinal steel bars (8) evenly distributed along the length direction and transverse steel bars (3) evenly distributed along the width direction.

3. The support-free joint structure for precast concrete composite slab construction according to claim 1, characterized in that: A plurality of evenly distributed steel bar trusses (2) are also provided on the upper surface of the precast concrete bottom plate (1).

4. The support-free joint structure for precast concrete composite slab construction according to claim 2, characterized in that: A U-shaped bend (4) is provided at the end of a plurality of longitudinal steel bars (8) located at the joints of adjacent precast concrete bottom plates (1), the U-shaped bends (4) on adjacent precast concrete plates are arranged in contact, and the connecting steel bars are located inside the U-shaped bends (4).

5. The support-free joint structure for precast concrete composite slab construction according to claim 4, characterized in that: The connecting steel bars are tied to the U-shaped bend (4) by means of binding wires.

6. The support-free joint structure for precast concrete composite slab construction according to claim 1, characterized in that: The UHPC concrete (5) contains a number of uniformly distributed steel fibers.

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