Connecting structure for quickly installing laminated slab and cast-in-place beam

Abstract

A connecting structure for rapidly installing a laminated slab and a cast-in-place beam comprises a concrete prefabricated slab, a concrete cast-in-place slab, a concrete cast-in-place beam, additional longitudinal bars and U-shaped joint bars. The concrete prefabricated slab and the concrete cast-in-place slab are stacked to form a stacked slab, slab bottom steel bars in the concrete prefabricated slab are all placed on upper steel bars of the concrete cast-in-place beam, and slab face steel bars of the concrete cast-in-place slab are bound and installed on erecting steel bars of the prefabricated slab. And when crossing the upper part of the concrete cast-in-place beam, the plate surface steel bars are not disconnected or bent and anchored on the upper part of the beam. An additional longitudinal bar is additionally arranged over the concrete cast-in-place beam, and then the U-shaped joint bar wraps the additional longitudinal bar and is inserted into the concrete cast-in-place beam. After beam slab concrete is poured, the concrete prefabricated slab, the concrete cast-in-place slab and the concrete cast-in-place beam are connected into a whole through the additional longitudinal bars and the U-shaped joint bars. According to the connecting structure for rapidly installing the laminated slab and the cast-in-place beam, the laminated slab is conveniently and rapidly installed, and the stress performance and the overall quality of the laminated slab are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of composite slab construction, in particular to a connection structure for quickly installing a composite slab and a cast-in-place beam. Background Art

[0002] In some large public construction projects, there are situations where the span of cast-in-place beams and composite slabs is large, the main structure is complex, and the main and secondary beams have large and dense steel bars. According to existing technical requirements, the steel bars (commonly known as "beard bars") extending from the composite slabs must be inserted into the cast-in-place beam steel bars, so that the cast-in-place beams can serve as the supports of the composite slabs. When the "beard bars" on all four sides of the composite slab need to be inserted into the cast-in-place beam steel bars around it, during the installation and construction of the prefabricated composite slab, the "beard bars" on all four sides of the composite slab cannot be directly inserted into the cast-in-place beam steel bars. The "beard bars" on two sides of the composite slab must be bent or the "beard bars" on three sides must be bent before hoisting, and then the "beard bars" must be straightened after hoisting into place. First, because there are many longitudinal bars and stirrups in the cast-in-place beams and the steel bars at the nodes of the primary and secondary beams are dense, there is no room to straighten the bent "bearded bars". Secondly, even if the cast-in-place beam steel bars are pried and then the "bearded bars" are straightened, the installation of the composite slab is very difficult and the installation speed is very slow. Finally, the "bearded bars" of the composite slab are bent and then straightened, which reduces the strength of the steel bars and even causes quality risks that cannot be rectified. The construction of the composite slab according to the existing technology will cause problems such as reduced strength of the steel bars and reduced quality of the floor slab. In addition, the connection structure between the composite slab and the cast-in-place beam is unstable, which poses a risk of collapse of the composite slab. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a connection structure of a composite plate and a cast-in-place beam which can be quickly installed, so as to connect the composite plate and the cast-in-place beam to form a whole without bending the "beard ribs" of the composite plate, thereby ensuring the strength of the "beard ribs" and the quality of the connection structure and the floor slab between the composite plate and the cast-in-place beam.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A fast-installed connection structure between a composite slab and a cast-in-place beam comprises a precast concrete slab, the bottom reinforcement of the precast concrete slab is placed on a reinforcement cage at the cast-in-place concrete beam, and the upper end of the erection reinforcement of the precast concrete slab is provided with the surface reinforcement of the cast-in-place concrete slab; during casting, the cast-in-place concrete slab and the cast-in-place concrete beam are connected by additional longitudinal reinforcement and U-shaped dowel bars to form an integral beam-slab structure.

[0006] The additional longitudinal reinforcement is arranged on the slab surface reinforcement of the cast-in-place concrete slab, and the U-shaped inserted reinforcement wraps the additional longitudinal reinforcement and is inserted into the reinforcement cage of the cast-in-place concrete beam.

[0007] The additional longitudinal reinforcement is parallel to the cast-in-place concrete beam, and the additional longitudinal reinforcement is arranged in multiple pieces, and the spacing between the additional longitudinal reinforcements is not greater than 200 mm.

[0008] The width of the U-shaped dowel is b-100mm, and the length of the U-shaped dowel anchored to the cast-in-place concrete beam is 35d; wherein: b is the width of the cast-in-place concrete beam, and d is the diameter of the U-shaped dowel.

[0009] The utility model provides a connection structure for quickly installing a composite plate and a cast-in-place beam, which has the following technical effects:

[0010] 1) The bottom of the precast concrete panel is completely placed on the cast-in-place concrete beam, which avoids the technical problem of inserting the "beard bar" of the precast concrete panel into the cast-in-place concrete beam. In this way, the precast concrete panel is completely placed on the cast-in-place concrete beam. The strength of the "beard bar" is ensured because there is no need to bend the precast concrete panel. The construction difficulty is reduced, making the installation of the precast concrete panel quick and convenient.

[0011] 2) Additional longitudinal reinforcement and U-shaped dowel bars are added to the cast-in-place concrete beams. The U-shaped dowel bars are inserted through the cast-in-place concrete slabs and precast concrete slabs into the cast-in-place concrete beams. The cast-in-place concrete slabs and precast concrete slabs can be connected to the cast-in-place beams to form an integral structure, thus ensuring the connection structure quality and floor slab quality between the composite slab (precast concrete slab + cast-in-place concrete slab) and the cast-in-place concrete beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 It is a schematic diagram of the assembly of the composite slab and the cast-in-place beam in the utility model.

[0014] Figure 2 This is a schematic diagram of the connection between the composite slabs of the same elevation and the two sides of the cast-in-place beams in the utility model.

[0015] Figure 3 It is a schematic diagram of the connection between the composite slab with different bottom elevations of the middle slab and the two sides of the cast-in-place beam in the utility model.

[0016] Figure 4 It is a schematic diagram of the connection between the composite slab with different bottom plate elevations and the two sides of the cast-in-place beam in the utility model.

[0017] Figure 5 It is a schematic diagram of the single-side connection between the composite slab and the cast-in-place beam in the utility model.

[0018] In the figure: precast concrete slab 1, cast-in-place concrete slab 2, cast-in-place concrete beam 3, additional longitudinal reinforcement 4, U-shaped dowel bar 5, slab bottom reinforcement 6, reinforcement cage 7, slab surface reinforcement 8, and frame reinforcement 9. DETAILED DESCRIPTION

[0019] like Figure 1-5 As shown, a fast-installed composite slab and cast-in-place beam connection structure includes a concrete precast slab 1, a concrete cast-in-place slab 2, and a concrete cast-in-place beam 3. The bottom reinforcement 6 in the concrete precast slab 1 is all placed on the reinforcement cage 7 of the concrete cast-in-place beam 3, and the surface reinforcement 8 of the concrete cast-in-place slab 2 is tied and installed above the concrete precast slab 1. The additional longitudinal reinforcement 4 is located directly above the concrete cast-in-place beam 3 and on the surface reinforcement 8, and then the U-shaped dowel bar 5 wraps the additional longitudinal reinforcement 4 and is inserted into the concrete cast-in-place beam reinforcement cage 7. After pouring the concrete of the beam slab (the concrete cast-in-place slab 2 and the concrete cast-in-place beam 3), the concrete precast slab 1, the concrete cast-in-place slab 2, and the concrete cast-in-place beam 3 are connected into an integral structure by the additional longitudinal reinforcement 4 and the U-shaped dowel bar 5.

[0020] The bottom reinforcement 6 and the vertical reinforcement 9 in the precast concrete slab 1 are installed and tied in the factory, and then the concrete is poured. After the concrete strength meets the requirements, it is transported to the site for installation.

[0021] The slab surface reinforcement 8 of the cast-in-place concrete slab 2, the reinforcement cage 7 of the cast-in-place concrete beam 3, the additional longitudinal reinforcement 4 and the U-shaped inserted reinforcement 5 are installed and tied at the construction site, and then the concrete is poured.

[0022] The additional longitudinal reinforcement 4 is a plurality of 12 mm diameter steel bars arranged parallel to the cast-in-place concrete beam 3. The spacing between the steel bars is not greater than 200 mm during on-site installation.

[0023] The diameter of the U-shaped dowel bar 5 is 12 mm. When it is made on site, its width is b-100 mm, where b is the width of the cast-in-place concrete beam 3. The anchoring length of the anchor in the cast-in-place concrete beam 3 during installation is 35 d (d is the diameter of the steel bar).

[0024] In actual engineering, the connection method of the intermediate support is based on the elevation of the bottom plate surface of the composite plate on both sides of the cast-in-place concrete beam 3. Figure 2-4 The connection method of the end support is as follows: Figure 5 Implementation.

[0025] Working process and principle:

[0026] 1) Prefabricate concrete precast panels 1 in the factory;

[0027] 2) Setting up formwork and scaffolding on site, and then tying up the steel cage 7 of the cast-in-place concrete beam 3;

[0028] 3) Transport the precast concrete panel 1 to the construction site and hoist it;

[0029] 4) Install and tie the slab surface reinforcement 8 of the cast-in-place concrete slab 2 at the construction site;

[0030] 5) Install and tie additional longitudinal reinforcement 4 at the construction site;

[0031] 6) Install and tie U-shaped reinforcing bars 5 at the construction site;

[0032] 7) Pour concrete for cast-in-place concrete slab 2 and cast-in-place concrete beam 3.

Claims

1. A connection structure for quickly installing a composite slab and a cast-in-place beam, characterized in that: The invention comprises a precast concrete slab (1), wherein the bottom reinforcement bars (6) of the precast concrete slab (1) are placed on a reinforcement cage (7) at a concrete cast-in-place beam (3), and the upper end of the erection reinforcement bars (9) of the precast concrete slab (1) is provided with the surface reinforcement bars (8) of the concrete cast-in-place slab (2); during casting, the concrete cast-in-place slab (2) and the concrete cast-in-place beam (3) are connected by additional longitudinal reinforcement bars (4) and U-shaped dowel bars (5) to form an integral beam-slab structure.

2. The connection structure of a quick-installation composite slab and a cast-in-place beam according to claim 1, characterized in that: The additional longitudinal reinforcement (4) is arranged on the slab surface reinforcement (8) of the cast-in-place concrete slab (2), and the U-shaped inserted reinforcement (5) wraps around the additional longitudinal reinforcement (4) and is inserted into the reinforcement cage (7) of the cast-in-place concrete beam (3).

3. The connection structure of a quick-installation composite slab and a cast-in-place beam according to claim 1, characterized in that: The additional longitudinal reinforcement (4) is parallel to the cast-in-place concrete beam (3), the additional longitudinal reinforcement (4) is arranged in a plurality of pieces, and the spacing between the additional longitudinal reinforcements (4) is no greater than 200 mm.

4. The connection structure of a quick-installation composite slab and a cast-in-place beam according to claim 1, characterized in that: The width of the U-shaped dowel bar (5) is b-100 mm, and the length of the U-shaped dowel bar (5) anchored to the cast-in-place concrete beam (3) is 35d; wherein: b is the width of the cast-in-place concrete beam (3), and d is the diameter of the U-shaped dowel bar (5).

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