CN201162299Y - A two-way laminated concrete slab with one-way floor - Google Patents

Abstract

The utility model discloses a one-way floor concrete two-way laminated slab, which comprises a plurality of concrete bottom slabs on which a plurality of bottom slab longitudinal steel bars and bottom slab transverse steel bars are arranged. layer, the laminated layer is laid with a laminated reinforcement, each of the horizontal reinforcements of the bottom plate protrudes at least 1.15 times the anchorage length of the reinforcement from the edge of the concrete bottom plate, and the horizontal reinforcement of the adjacent bottom plate is in the The inter-bottom board seams are overlapped. The laminated plate of the utility model can realize two-way stress, and the thickness can be reduced by more than 20% compared with the existing one-way laminated plate, and the cracks can meet the requirements of the national standard, and the degree of no cracking can be achieved after prestressing is applied. It is suitable for larger spans and realizes the effect of not setting secondary beams in the column network.

Description

A two-way laminated concrete slab with one-way floor

technical field

The utility model relates to a laminated slab, in particular to a concrete two-way laminated slab with a unidirectional floor.

Background technique

The laminated slab is a floor that uses the prefabricated concrete bottom slab as a template, pours a laminated layer on it, and works as a whole after the pouring is completed. At present, the laminated slab has been widely used in prefabricated structures. my country's national standard " The Code for Design of Concrete Structures (GB50010-2002) has clear regulations on the design and construction of laminated slabs, but it is limited to one-way laminated slabs, that is, the precast concrete floor is a one-way slab, and it still works as a one-way slab after the lamination is completed. The industrialization and standardization of one-way laminated boards are very good, but as one-way boards, the applicable span is small and the thickness of the board is thick.

Contents of the invention

The purpose of this utility model is to overcome the shortcomings of the prior art, and to provide a prefabricated concrete floor that can be used as a formwork for one-way stress during construction to realize overall two-way stress after the superimposed layer is poured, which can be applied to larger spans , reduce the thickness of the slab, control the cracking of the slab seam and the direction parallel to the prefabricated slats, a kind of unidirectional floor concrete two-way laminated slab.

A concrete two-way laminated slab with one-way floor of the present utility model comprises a plurality of concrete floor on which a plurality of floor length steel bars and floor transverse steel bars are arranged, and a lamination layer is poured on each concrete floor , the laminated layer is laid with a laminated steel bar, and each of the horizontal reinforcements of the bottom plate protrudes at least 1.15 times the anchorage length of the reinforcement from the edge of the concrete bottom plate, and the horizontal reinforcement of the adjacent bottom plate is in the The above-mentioned overlapping joints in the seams between the bottom plates.

According to the composite slab of the utility model, since the transverse steel bar of the bottom plate stretches out at least 1.15 times of the anchorage length of the steel bar at the edge of the concrete floor and a slab gap with a width not less than 0.5 times of the anchorage length of the steel bar+50mm is set between the adjacent concrete floor, the transverse steel bar is in the The slab joints are overlapped, so the concrete two-way laminated slab structure can realize two-way stress. Compared with the existing one-way laminated slab, the thickness can be reduced by more than 20%, and the cracks can meet the requirements of the national standard. It can reach the degree of no cracking. It is suitable for larger spans and realizes the effect of not setting secondary beams in the column network.

Description of drawings

Fig. 1 is the schematic diagram of plane layout of the concrete two-way laminated slab of the unidirectional bottom slab of the present invention;

Fig. 2 is the detailed view of the concrete floor of the laminated slab shown in Fig. 1;

Fig. 3 is a schematic side view of the connection structure of the laminated plate structure shown in Fig. 1 using the first type of plate seam;

Fig. 4 is a schematic side view of the connection structure of the laminated slab shown in Fig. 1 using the second type of seam;

Fig. 5 is a schematic diagram of A-A section of the laminated plate shown in Fig. 2 .

Detailed ways

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

As shown in the accompanying drawing, a kind of one-way floor concrete two-way laminated slab of the present utility model comprises a plurality of concrete floor 3 on which a plurality of floor length reinforcement bars 1 and floor transverse reinforcement bars 2 are arranged, each of the concrete floor 3 is poured with a laminated layer 4, and the laminated plate reinforcement 6 is laid in the laminated layer 4, and each of the horizontal steel bars of the bottom plate protrudes from the edge of the concrete bottom plate by at least 1.15 times the anchorage length of the steel bar, so that Satisfy the lap splicing requirements of steel bars. The width H1 of the joints between the adjacent concrete floor plates is preferably not less than 0.5 times the anchorage length of the reinforcement + 50mm, so as to ensure that the overlap of the reinforcement has a sufficient length of the straight section. The transverse steel bars of the adjacent bottom plates are overlapped in the gap between the bottom plates, the horizontal overlapping length of the horizontal steel bar in the gap between the bottom plates is preferably at least 0.5La, and the horizontal reinforcement is bent by 90° or 135° is anchored in the laminated layer, which can effectively ensure the force transmission between the steel bars. It should be noted that the anchorage length of steel bars can be determined according to the actual stress of the steel bars, except for floors directly bearing dynamic loads.

One-way floor concrete two-way laminated slab is a floor slab with overall two-way stress characteristics formed by connecting one-way precast concrete floor through laminated concrete and slab joints. Its main components are precast concrete floor, slab joints, rear Pour concrete overlay.

The precast concrete floor can be made into slats of standard width to maximize standardization and industrialization. The width of the slats can generally be 1.2m or 0.9m. The precast concrete floor is generally arranged along the short direction of the floor, and the length of the slats is based on the span It is determined that the cross-sectional shape of the bottom plate should be rib-shaped, which can greatly improve the rigidity of the bottom plate during construction, and reduce or eliminate temporary supports. Different from general laminated slabs (one-way reinforced reinforcement and distributed reinforcement in the other direction), bidirectional laminated slab floor is equipped with reinforced reinforcement at the bottom of the slab in both directions, and the configuration of reinforced reinforcement along the width direction should include laminated layer The two-way slab of the overall work including 4 is calculated and determined, and the transverse reinforcement 2 of the bottom slab should extend at least 1.15La from the edge of the slab (La is the anchorage length of the reinforcement). The reinforcement along the length direction of the bottom slab should be determined based on the two conditions of construction and use, and its internal force should be calculated according to the following two stages: the first stage is the stage before the post-cast composite layer concrete does not reach the strength design value, and the load is determined by The precast concrete floor bears the burden. The precast concrete floor is calculated as a continuous or simply supported one-way slab according to whether there is temporary support. The load includes the self-weight of the precast concrete floor, the self-weight of the superimposed layer and the construction live load of this stage; the second stage is the composite layer concrete. At the stage after the strength value specified in the design is reached, the laminated slab is calculated as an overall two-way slab, and the load includes the self-weight of the laminated slab (precast concrete floor 3, laminated layer 4 and slab joint 5), the self-weight of the surface layer, suspended ceiling, etc., and the construction at this stage The greater of live loads and use-phase variable loads. According to requirements, the reinforcement 1 along the length direction of the precast concrete floor can be prestressed reinforcement or non-prestressed reinforcement, and the protruding plate end is at least 5d (d is the diameter of the reinforcement); the reinforcement along the width direction of the precast concrete floor can only be non-prestressed rebar.

In order to achieve the purpose of two-way stress, it is necessary to organically connect each precast concrete floor into a whole. there is a big difference. The width of the plate seam H1 must not be less than 0.5La+50mm (La is the anchorage length of the steel bar), and the horizontal lap length of the steel bar along the width direction of the bottom plate in the plate seam is at least 0.5La, and then bent (90° or 135°) for anchoring in the superimposed layer.

The superimposed layer and the precast concrete floor form a whole by relying on the superimposed surface left on the upper surface of the precast concrete floor, and the unevenness of the superimposed surface shall not be less than 4mm according to the usual construction standard. The reinforcement in the laminated layer is determined according to the calculation of the overall two-way slab.

Experimental research and engineering practice have proved that the performance of the concrete two-way laminated slab designed and constructed by the above method is exactly the same as that of the integral cast-in-place concrete slab, and can be used as a two-way slab.

The manufacturing process of a kind of unidirectional floor concrete two-way laminated slab of the present utility model is as follows:

1. Laminated slab design, the laminated slab is designed according to the two stages of construction and work, the prefabricated floor is designed according to the one-way slab during the construction stage, and the prefabricated floor and laminated layer are designed as a whole according to the two-way slab during the working stage.

2. For the design of slab joints and steel bar connections, determine the width of the slab joints to be reserved according to the specifications of the steel bars selected at the bottom of the slab, and determine the connection method of the steel bars.

3. The factory makes prefabricated bottom slabs, the bottom slabs are made of standard width slats, the cross-sectional shape of the bottom slabs is made into a rib shape, and the bottom slab is equipped with two-way steel bars, among which prestressed steel bars can be arranged along the span direction. On the upper surface of the bottom plate, a superimposed surface with a bump not less than 4mm is reserved.

4. The prefabricated bottom slab is installed in place, and both ends are supported on the beam. When the span is greater than 3m, a temporary support is provided every 3m, and the slats are left with 5 seams according to the designed width. And lay the reinforcement 6 on the laminated plate.

5. Concrete is poured in the laminated layer, in which the slab joints are constructed by hanging formwork, and the prefabricated bottom slats form an integral two-way slab through the laminated layer.

6. After the laminated layer concrete reaches the design strength, the temporary support is removed, and the two-way laminated slab is completed.

Claims (4)

1. a kind of unidirectional base plate concrete two-way laminated slab, it comprises multiple concrete base plates that are provided with many base plate lengthwise reinforcing bars and base plate transverse reinforcement on it, is poured with laminated layer on each described concrete base plate, so The above-mentioned laminated layer is laid with a laminated steel reinforcement, which is characterized in that: each of the horizontal reinforcements of the bottom plate protrudes at least 1.15 times the anchorage length of the reinforcement from the edge of the concrete bottom plate, and the horizontal reinforcement of the adjacent bottom plate Lap joints in the seam between the base plates. 2. The one-way floor concrete two-way laminated slab according to claim 1, characterized in that: the width of the joint between the adjacent concrete floor plates is not less than 0.5 times the anchorage length of the reinforcement + 50mm. 3. The concrete two-way laminated slab with one-way bottom slab according to claim 1, characterized in that: the horizontal overlapping length of the horizontal reinforcement in the said slab seam is at least 0.5La, and it is bent by 90° or 135° ° Anchored within said laminate. 4. The concrete two-way laminated slab with one-way bottom slab according to claim 1, characterized in that: the longitudinal reinforcement of the bottom slab is prestressed or non-prestressed reinforcement, and the transverse reinforcement is non-prestressed reinforcement.

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