A method for installing cast-in-place beams and composite slabs

Abstract

The present invention discloses a method for installing and constructing a cast-in-place beam and a composite slab, comprising the following steps: Step 1: erecting a main beam bottom formwork and a composite slab lower support; Step 2: after the main beam bottom formwork is completed, tying the lower row of main beam reinforcement, waist reinforcement, and stirrups, and sealing the beam side formwork and the composite slab flanging formwork; Step 3: after the composite slab bottom support and beam side formwork are installed, the composite slab is hoisted, and then the upper parts of two adjacent stirrups are untied near the end of the main beam and opened to both sides to form a through-reinforcement opening, and the upper row of reinforcement is passed through the through-reinforcement opening into the main beam, and the upper row of reinforcement is clamped with a beam through-reinforcement tool and inserted into the main beam in sections, and then the upper row of reinforcement is hoisted using the beam through-reinforcement tool to complete the stirrup tying work; Step 4: tying the surface layer reinforcement of the composite slab, and finally pouring concrete. The present invention has a high construction speed, saves labor costs, improves labor efficiency, and reduces quality problems caused by warped structural beam reinforcement.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a method for installing and constructing cast-in-situ beams and composite slabs. Background Art

[0002] Precast concrete structures are widely used in residential buildings in my country. This prefabricated construction technology offers advantages such as cost control, quality assurance, economy, and safety, meeting the national energy-saving and low-carbon economic development requirements. Currently, due to its significant advantages in meeting green construction and green building requirements, it is rapidly gaining popularity and is being adopted in public buildings. One project is a multi-story public frame structure using bidirectional truss composite slabs.

[0003] Currently, the mainstream construction methods for composite slabs are: first tying the cast-in-place structural beam reinforcement and then hoisting the composite slab, or first hoisting the composite slab and then tying the cast-in-place structural beam reinforcement. The first method has the disadvantage of requiring the bidirectional reinforcement on both sides to be bent and the structural beam reinforcement to complete the composite slab installation, resulting in steel deformation. The second method also has the disadvantage of making it difficult to tie the structural beam reinforcement at the bidirectional reinforcement of the composite slab, reducing labor efficiency. Summary of the Invention

[0004] The present invention provides a method for installing and constructing cast-in-situ beams and composite slabs, which has a fast construction speed, saves labor costs and improves labor efficiency, while reducing quality problems caused by warped structural beam steel bars.

[0005] The technical problem being addressed is that during composite slab construction, there are two mainstream methods: first tying the cast-in-place structural beam reinforcement and then hoisting the composite slab, or first hoisting the composite slab and then tying the cast-in-place structural beam reinforcement. The first method has the disadvantage of requiring the bidirectional reinforcement on both sides to be bent and the structural beam reinforcement to properly install the composite slab, which can cause deformation of the reinforcement. The second method also has the disadvantage of making it difficult to tie the structural beam reinforcement at the bidirectional reinforcement of the composite slab, reducing labor efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a method for installing a cast-in-situ beam and a composite slab, comprising the following steps:

[0008] Step 1: Set up the main beam bottom formwork and the lower support of the composite slab;

[0009] Step 2: After the main beam bottom formwork is completed, tie the lower row of main beam reinforcement, waist reinforcement and stirrups. After the main beam reinforcement is tied except for the upper row of reinforcement, seal the beam side formwork and composite slab flanging formwork;

[0010] Step 3: After the installation of the composite slab bottom support and beam side formwork is completed, the composite slab is hoisted. Then, at the position near the end of the main beam, the upper parts of the two adjacent stirrups are untied and opened to both sides to form a reinforcement opening. The upper row of steel bars are passed through the reinforcement opening into the main beam. With the beam-piercing tool, the upper row of steel bars are clamped and inserted into the main beam section by section until the upper row of steel bars are completely inserted into the beam. Then, the upper row of steel bars are hoisted with the beam-piercing tool to complete the stirrup binding work.

[0011] Step 4: Tie the steel bars of the composite slab surface layer and finally pour the concrete.

[0012] The invention provides a cast-in-situ beam and composite slab installation construction method, further comprising releasing the binding of the upper parts of two adjacent stirrups within a 1 / 3 section in the middle of the main beam span.

[0013] The invention provides a cast-in-situ beam and composite slab installation construction method, further comprising opening two adjacent stirrups to both sides with a width of 20 cm.

[0014] The invention provides a method for installing and constructing a cast-in-situ beam and a composite slab. Further, at both ends of the main beam, upper portions of two adjacent stirrups are untied within a 1 / 3 section in the middle of the span to form two reinforcement openings.

[0015] The present invention provides a method for installing and constructing a cast-in-situ beam and a composite slab. Furthermore, in step 3, the stirrups that need to be opened to both sides are only tied at the bottom.

[0016] The present invention provides a method for installing and constructing cast-in-place beams and composite plates. Furthermore, the beam-piercing tool includes a bottom fixing rod, clamping rods welded to the front end of the fixing rod on its upper and lower sides, a limiting rod welded to the rear end of the fixing rod on its lower side, and an arc rod connected to the rear end of the fixing rod, wherein the arc rod is bent toward the front end side of the fixing rod.

[0017] The present invention provides a method for installing and constructing cast-in-place beams and composite slabs. Furthermore, the specific steps for threading the upper row of steel bars are as follows: inserting the upper row of steel bars from the steel bar insertion opening, then clamping the upper row of steel bars at the insertion point with a clamping rod, and then manually inserting the steel bars into the main beam section by section through an arc-shaped rod, wherein as the insertion length of the upper row of steel bars increases, additional beam threading tools are provided along the main beam area to clamp the steel bars.

[0018] The invention provides a method for installing and constructing a cast-in-situ beam and a composite slab. Furthermore, a grout-proofing strip is pasted on a composite slab flap template.

[0019] The present invention provides a method for installing and constructing a cast-in-situ beam and a composite slab. Furthermore, the overlap between the composite slab and the main beam should not be less than 10 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This application avoids the method of bending the two-way steel bars on both sides and tilting the structural beam steel bars to install the composite slab. Instead, it adopts the method of first tying the beam bottom steel bars and stirrups, then installing the composite slab, and finally tying the beam top steel bars. This method can effectively control the quality of the beam-column joints and the beam bottom steel bar tying. By reasonably avoiding the structural beam steel bars at the composite slab two-way steel bars where it is difficult to tie and reduce labor efficiency, the construction efficiency is improved.

[0022] 2. By using a different construction process from traditional cast-in-situ structural beam reinforcement to complete the installation of the two-way truss composite slab and the binding of the cast-in-situ structural beam reinforcement, the problem of conflict between the reserved anchor bars and the longitudinal reinforcement of the beam during the installation of the composite slab is solved, which makes the installation difficult, reduces the construction efficiency and cannot guarantee the quality.

[0023] 3. This application utilizes a beam penetration tool to penetrate the upper reinforcement bars of the beam and tie them inside the beam. The tool is simple, easy to make, and convenient to use.

[0024] The present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the binding of the lower row of steel bars, waist bars and stirrups of the main beam of the present invention;

[0026] Figure 2 This is a schematic diagram of the connection structure between the composite plate and the main beam of the present invention;

[0027] Figure 3 This is a schematic diagram of untying two stirrups of the present invention;

[0028] Figure 4 This is a schematic diagram of the beam penetration tool of the present invention penetrating the upper row of steel bars of the main beam;

[0029] Figure 5 This is a schematic diagram of the structure of the beam penetration tool of the present invention lifting the upper row of steel bars;

[0030] Figure 6 This is a schematic structural diagram of the beam-piercing tool of the present invention.

[0031] Reference numerals:

[0032] 1. Main beam; 2. Composite slab; 3. Lower row of steel bars; 4. Waist bars; 5. Stirrups; 6. Rebar insertion opening; 7. Beam insertion tool; 71. Fixing rod; 72. Clamping rod; 73. Limiting rod; 74. Arc rod; 8. Upper row of steel bars. DETAILED DESCRIPTION

[0033] like Figures 1-6 As shown, the present invention discloses a method for installing and constructing a cast-in-place beam and a composite slab, comprising the following steps:

[0034] After the technical preparation work such as measurement and layout is completed, the structural column reinforcement is tied according to the normal process, and then the bottom formwork support of the main beam 1 and the lower support of the composite plate 2 are set up.

[0035] After the bottom formwork of the main beam 1 is completed, the lower row of steel bars 3, waist bars 4, and stirrups 5 of the main beam 1 are tied. The stirrups 5 are used to position and tie the reinforcement in the main beam 1 except for the upper row of steel bars 8. The core area of ​​the beam and column, and other areas where stirrups 5 are needed for density, are tied completely. Among them, the stirrups 5 in the 1 / 3 section of the span of the main beam 1 are only simply tied at the bottom. After the main beam 1 steel bars except the upper row of steel bars 8 are tied, the side formwork of the beam and the flange formwork of the composite slab 2 are sealed. Among them, anti-leakage adhesive strips are pasted on the flange formwork of the composite slab 2 to prevent leakage during the pouring of the floor slab concrete, which affects the appearance of the structure. During the hoisting and installation of the composite slab 2, attention should be paid to the positioning of the structural beam stirrups 5 to avoid collision with the two-way anchor bars of the composite slab 2 and displacement. When the composite slab 2 enters the support, the overlap between the plate end and the structural main beam 1 should not be less than 10mm.

[0036] After the bottom support of the composite slab 2 and the beam side formwork are completed, the composite slab 2 is hoisted. After the installation of the composite slab 2 is completed, the upper parts of the two adjacent stirrups 5 are untied in the 1 / 3 section of the main beam 1 span, and then an area with a width of about 20 cm is opened to both sides to form a reinforcement opening 6. The upper row of steel bars 8 are inserted into the main beam 1 in the 1 / 3 section of the main beam 1 span, and the upper row of steel bars 8 are extended into the beam section by section with the help of the beam penetration tool 7 until the upper row of steel bars 8 are completely inserted into the beam. Then, the upper row of steel bars 8 are hoisted with the beam penetration tool 7, and the tying work of the stirrups 5 is completed. Then, the surface steel bars of the composite slab 2 are tied. Finally, the concrete can be poured after the final acceptance is completed.

[0037] The beam-piercing tool 7 includes: a bottom fixing rod 71, a clamping rod 72 welded and fixed to the front end of the fixing rod 71 on its upper and lower sides, a limiting rod 73 welded and fixed to the rear end of the fixing rod 71 on its lower side, and an arc rod 74 connected to the rear end of the fixing rod 71, the arc rod 74 is bent toward the front end side of the fixing rod 71, wherein the clamping rod 72 and the limiting rod 73 are arranged parallel to each other, and the beam-piercing tool 7 is divided into two states. One is that the steel bars are clamped between the clamping rods 72 and rest on the limiting rod 73, so that the steel bars are clamped on the beam-piercing tool 7, which is convenient for moving the upper row of steel bars 8 through the beam-piercing tool 7; the other is that it is only arranged between the clamping rod 72 and the limiting rod 73, which is convenient for operation and is used to lift the upper row of steel bars 8.

[0038] The specific steps of threading the upper row of steel bars 8 are as follows: insert the upper row of steel bars 8 into the 1 / 3 section of the span of the main beam 1, then use the clamping rod 72 to clamp the upper row of steel bars 8 at the insertion point, and then use the arc rod 74 and manual labor to insert the steel bars into the main beam 1 one by one. During the insertion process, as the length of the main bars inserted increases, additional beam-threading tools 7 are added along the main beam 1 area to clamp the steel bars. On the one hand, the position of the steel bars is controlled, and on the other hand, the steel bars are assisted in threading. After the upper row of steel bars 8 are completely inserted into the beam, the beam-threading tool 7 is used to lift the upper row of steel bars 8. When lifting the upper row of steel bars 8, the upper row of steel bars 8 is clamped between the clamping rod 72 and the limiting rod 73 on the upper side, and the upper row of steel bars 8 is lifted, which is more convenient to operate.

[0039] In addition, the upper parts of the two adjacent stirrups 5 at the left and right ends of the main beam 1 are untied within the 1 / 3 section of the middle span of the main beam 1, and then an area with a width of about 20 cm is opened to both sides. On the one hand, this meets the installation requirements of the short steel bars at the end of the main beam 1 and facilitates the insertion of the short steel bars. On the other hand, both ends of the main beam 1 can be carried out simultaneously, which improves the construction efficiency.

[0040] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A method for installing a cast-in-situ beam and a composite slab, characterized in that: The following steps are involved: Step 1: Set up the bottom formwork of the main beam (1) and the lower support of the composite plate (2); Step 2: After the bottom formwork of the main beam (1) is completed, the lower row of steel bars (3), waist bars (4) and stirrups (5) of the main beam (1) are tied. After the binding of the main beam (1) steel bars except the upper row of steel bars (8) is completed, the side formwork of the beam and the flanging formwork of the composite plate (2) are sealed; Step 3: After the bottom support of the composite slab (2) and the beam side formwork are installed, the composite slab (2) is hoisted, and then the upper parts of the two adjacent stirrups (5) are untied at the position near the end of the main beam (1), and opened to both sides to form a reinforcement opening (6), and the upper row of steel bars (8) are passed through the reinforcement opening (6) into the main beam (1), and the upper row of steel bars (8) are clamped with the beam penetration tool (7) and the upper row of steel bars (8) are extended into the main beam (1) section by section until the upper row of steel bars (8) are completely penetrated into the beam, and then the upper row of steel bars (8) are hoisted using the beam penetration tool (7) to complete the binding work of the stirrups (5); Step 4: Tie the surface reinforcement of the composite slab (2) and finally pour the concrete.

2. The method for installing a cast-in-situ beam and composite slab according to claim 1, characterized in that: The upper parts of two adjacent stirrups (5) are untied within the 1 / 3 section of the span of the main beam (1).

3. The method for installing a cast-in-situ beam and a composite slab according to claim 1, characterized in that: The two adjacent stirrups (5) are opened to both sides by 20 cm.

4. The method for installing a cast-in-situ beam and composite slab according to claim 2, characterized in that: At both ends of the main beam (1), the upper parts of two adjacent stirrups (5) are untied within the 1 / 3 section of the span to form two reinforcement openings (6).

5. The method for installing a cast-in-situ beam and composite slab according to claim 1, characterized in that: The stirrups (5) that need to be opened to both sides in step 3 are only tied at the bottom.

6. The method for installing a cast-in-situ beam and composite slab according to claim 1, characterized in that: The beam-piercing tool (7) comprises a bottom fixing rod (71), clamping rods (72) welded to the front end of the fixing rod (71) at the upper and lower sides thereof, a limiting rod (73) welded to the rear end of the fixing rod (71) at the lower side thereof, and an arc-shaped rod (74) connected to the rear end of the fixing rod (71), wherein the arc-shaped rod (74) is bent toward the front end side of the fixing rod (71).

7. The method for installing a cast-in-situ beam and composite slab according to claim 6, characterized in that: The specific steps of threading the upper row of steel bars (8) are as follows: inserting the upper row of steel bars (8) from the steel bar threading opening (6), then clamping the upper row of steel bars (8) at the threading position using a clamping rod (72), and then manually threading the steel bars into the main beam (1) section by section using an arc-shaped rod (74), wherein as the threading length of the upper row of steel bars (8) increases, additional beam threading tools (7) are provided along the main beam (1) area to clamp the steel bars.

8. The method for installing a cast-in-situ beam and composite slab according to claim 1, characterized in that: A leak-proof adhesive strip is pasted on the flap template of the composite board (2).

9. The method for installing a cast-in-situ beam and composite slab according to claim 1, characterized in that: The overlap between the composite slab (2) and the main beam (1) should not be less than 10 mm.

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