CN103410265A - Splicing structure of laminated floor slab - Google Patents

Abstract

The invention discloses a splicing structure of laminated floor slabs, which comprises prefabricated concrete slabs, lower reinforcement mesh, truss reinforcement, additional reinforcement, upper reinforcement mesh and cast-in-situ concrete, the truss reinforcement is bound to the lower reinforcement mesh, and the lower reinforcement mesh is poured In the prefabricated concrete slab, the upper layer of reinforcement stands on the top surface of the truss reinforcement, and additional reinforcement is added to the lower layer at the joint of the laminated floor, and the laminated floor is integral cast-in-situ concrete. The invention ensures the rationalization of plate division and the reliability of the splicing structure, ensures the overall performance of the structure, and avoids the occurrence of cracks at the splicing place.

Description

A splicing structure of laminated floor slabs

technical field

The invention relates to a division method and splicing structure of a laminated floor, belonging to the technical field of prefabricated and assembled laminated floor structures in construction engineering.

Background technique

With the continuous advancement of my country's construction industrialization process, the construction industry is facing new challenges, and my country's construction industry as a whole is still in an extensive development mode, which is difficult to meet the requirements for energy conservation and emission reduction proposed in the "Twelfth Five-Year Plan". After the 18th National Congress of the Communist Party of China, the building energy-saving industry has gained more opportunities for development. "Industrialization of construction and industrialization of housing" is the only way for the transformation of my country's construction industry.

It is difficult to deal with the splicing joints between the fully prefabricated floor slab and other components of the building structure, and the integrity is weakened. The laminated floor slab belongs to the prefabricated assembly structure system. It is a partly prefabricated and partly cast-in-place component. It combines the advantages of high industrialization of prefabricated assembly and good integrity of all-in-place cast-in-place, and can meet the requirements of standardized design, factory production and assembly construction. Require.

When the floor area is large, the factory mold cannot meet the production requirements of one-time forming, so the large slab has to be divided and assembled on site after the factory production is completed. However, unreasonable splitting methods and splicing structures will lead to changes in the mechanical properties of the plates, and cracks are prone to appear at the splicing.

Contents of the invention

In order to ensure the rationalization of plate division and the reliability of the splicing structure, ensure the overall performance of the structure, and avoid the occurrence of cracks at the splicing part, the present invention provides a splicing structure of superimposed floor slabs.

The technical solution adopted in the present invention is: a splicing structure of laminated floor slabs, including prefabricated concrete slabs, lower reinforcement mesh, truss reinforcement, additional reinforcement, upper reinforcement mesh and cast-in-situ concrete, the truss reinforcement is bound to the lower reinforcement mesh, The lower reinforcement mesh is poured into the prefabricated concrete slab, the upper reinforcement frame stands on the top surface of the truss reinforcement, and additional reinforcement is added to the lower layer at the splicing joint of the laminated floor, and the laminated floor is integral cast-in-place concrete.

Preferably, if the engineering production capacity permits, the joints of the laminated floor slabs are arranged as close as possible to or in the negative bending moment section of the slab span. When calculating the negative bending moment, the negative bending moment position obtained when all the slab spans in the vertical direction of the splitting direction are arranged for the most unfavorable live load should be used as a reference to set the splitting joint.

As a preference, the lower steel mesh is bent and passed through the joint, and a thickness of protective layer is left between the bend and the joint,

As a preference, the thickness of the prefabricated concrete slab at the seam of the laminated floor slabs can be appropriately reduced, and the length should be sufficient to place additional steel bars.

As a preference, the lower steel bars at the joints may not be bent upwards, but cut off in the prefabricated floor, and additional reinforcements are added at the joints.

As a preference, an additional steel bar on the upper floor may be added to the seams of the laminated floor slabs.

Preferably, there may be one or more splicing joints in the same span slab, that is, one integral precast concrete slab can be spliced in two or more pieces.

As a preference, the additional reinforcing bars may be provided in two directions, or only additional reinforcing bars perpendicular to the direction of the splicing seam may be provided.

Preferably, the bent and extended length of the lower steel mesh at the joint is between 200mm and 1500mm.

Beneficial effects of the present invention:

1. The prefabricated laminated slab is both a structure and a template of the structure, which saves the on-site formwork process, saves energy and protects the environment, shortens the construction period, and reduces the cost.

2. On the basis of a reliable joint structure, the present invention first reasonably determines the joint division position to ensure the mechanical performance of the structure.

3. The additional steel bars and the lower steel bars are bent and cross the joints to ensure the integrity of the structure and avoid cracks.

Description of drawings

Fig. 1 is the schematic diagram of the prefabricated part in the laminated floor slab of the present invention;

Fig. 2 is a cross-sectional view of Embodiment 1 of laminated floor slabs in the invention;

Fig. 3 is a sectional view of Embodiment 2 of the laminated floor slab in the invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

When the engineering production capacity permits, the split joints of the laminated floor slabs shall be set as close as possible to or in the negative bending moment section of the slab span. Fig. 1 is a schematic diagram of the prefabricated part in the laminated floor slab, and the said structure is splicing the prefabricated part.

Embodiment 1: As shown in FIG. 2 , the laminated floor includes a prefabricated concrete slab 1 , a lower reinforcement mesh 2 , a truss reinforcement 3 , an additional reinforcement 6 , an upper reinforcement mesh 5 and cast-in-place concrete 4 . The truss reinforcement 3 is bound to the lower reinforcement mesh 2 and poured into the prefabricated concrete slab 1 . When splicing, add additional reinforcement 6 to the lower layer of the joint, the thickness of the two prefabricated concrete slabs 1 is reduced within the range of the additional reinforcement 6 at the joint, and the lower reinforcement near the joint can be bent at a place where there is enough thickness of the protective layer. Go over the seams. 5 frames of the upper layer of reinforcement mesh stand on the top surface of the truss reinforcement 3, and the upper layer of additional reinforcement 6 can be added to the joints, and finally the concrete is poured. It should be noted that the inner side of the prefabricated concrete slab 1 should be roughened to increase bonding with the cast-in-place concrete 4 .

Embodiment 2: As shown in Figure 3, two precast concrete slabs 1 did not change the thickness of the precast concrete slab 1 at the joint, nor did they bend the lower steel mesh 2, but were cut off in the precast concrete slab 1, and the joints were cut off. Add additional reinforcing bar 6, and all the other ways are the same as in embodiment 1.

It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (9)

1. the splicing structure of a laminated floor slab, it is characterized in that: comprise precast concrete plank, lower floor's steel mesh reinforcement, truss bars, additional bar, top mat and cast-in-situ concrete, described truss bars colligation is on lower floor's steel mesh reinforcement, lower floor's steel mesh reinforcement is cast in precast concrete plank, described top reinforcement frame stands on the truss bars end face, the splicing seams place lower floor of this laminated floor slab adds additional bar, and described laminated floor slab is the integral cast-in-situ concrete.

2. the splicing structure of a kind of laminated floor slab according to claim 1 is characterized in that: described laminated floor slab splicing seams as far as possible near or be arranged on plate across negative moment area.

3. the splicing structure of a kind of laminated floor slab according to claim 1 is characterized in that: the splicing seams of laminated floor slab is passed through in the steel mesh reinforcement bending of described lower floor, leaves protective layer thickness between described bending place and splicing seams.

4. the splicing structure of a kind of laminated floor slab according to claim 1, it is characterized in that: described laminated floor slab splicing seams place precast concrete plate thickness reduces, and the length that thickness reduces plate meets can place additional bar.

5. the splicing structure of a kind of laminated floor slab according to claim 1, it is characterized in that: described lower floor steel mesh reinforcement blocks in precast concrete plank, and the splicing seams place adds additional bar.

6. the splicing structure of a kind of laminated floor slab according to claim 1, is characterized in that: described laminated floor slab splicing seams place interpolation upper strata additional bar.

7. the splicing structure of a kind of laminated floor slab according to claim 1, it is characterized in that: the splicing seams in described same straddle is one or more, namely integral prefabricated concrete slab divides two or polylith to splice.

8. the splicing structure of a kind of laminated floor slab according to claim 1, it is characterized in that: described additional bar is two-way setting, or only arranges perpendicular to the splicing seams direction.

9. the splicing structure of a kind of laminated floor slab according to claim 3 is characterized in that: described lower floor steel mesh reinforcement bends at the splicing seams place and the length of extending is between 200～1500mm.

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