CN106836592A - Overlapped hollow floor system after partial precast assembled - Google Patents

Abstract

The invention discloses a partially prefabricated assembled post-lamination hollow floor, which comprises a cast-in-place floor bottom plate, a cast-in-place rib beam slab grid and a prefabricated flat plate. First support the bottom formwork and beam rib side formwork, tie the bottom plate and rib beam reinforcement, then pour the hollow floor bottom slab and rib beam concrete, leave the construction joints to the bottom of the top slab, and then place the prefabricated slabs corresponding to the hollow dimensions Lift it to the top of the rib beam, then place the stressed longitudinal reinforcement connected with the concealed beam at the corresponding position of each rib beam, and finally pour the rib beam position between each slab twice, and the curing is completed. The present invention cancels the inner mold material in the hollow floor, and adopts two new hollow floor structures formed by secondary superposition pouring during construction. This structural type will be able to solve all the above-mentioned problems existing in the traditional hollow floor without increasing the difficulty of construction.

Description

Partially prefabricated post-lamination hollow floor

technical field

The invention relates to the field of prefabricated buildings, in particular to hollow-core floors.

Background technique

Due to its small structural height, high spatial rigidity, and more economical design cost than ordinary rib-beam floors, hollow-core floors have good application prospects in long-span garages, businesses, squares, and some large-slab structures.

However, the existing hollow floor needs to use the internal formwork (full cast-in-place concrete), and the following problems exist in the actual construction process:

(1) The internal mold materials provided by the hollow floor internal mold suppliers do not have uniform specifications and standards. At present, the detailed design of the hollow floor can only be carried out by the internal mold suppliers according to their unique materials, and the internal mold suppliers usually It is determined by the construction general contractor. When the construction drawing has not been issued and the construction general contractor has not been determined, it is unrealistic to require the internal mold supplier to carry out the detailed design of the hollow floor in advance, so that there will be problems in the management procedures. disorder;

(2) Internal mold suppliers monopolize their own internal mold supply materials, so the cost of internal mold materials is relatively high, and a certain proportion of construction cooperation fees must be paid to the general contractor during implementation, which greatly increases the project cost;

(3) It is difficult to pour the concrete of the fully cast-in-place concrete hollow floor floor compactly and uniformly, which greatly affects the quality of the project;

(4) Due to the irregular plane shape of most garages and other projects, the specifications and sizes of the internal mold materials limit the free arrangement of the hollow positions in the hollow floor, resulting in many parts such as corners having to be made solid, resulting in a large increase in engineering costs .

(5) The on-site wet work of the all-in-situ concrete hollow floor is large, the construction period is long, and the degree of industrialization is low.

Contents of the invention

The purpose of the invention is to solve a series of problems caused by the use of the inner mold in the construction of the existing hollow floor. It is proposed to cancel the internal mold material in the hollow floor, and to adopt two new hollow floor structures formed by secondary superposition pouring during construction.

The technical solution adopted in order to realize the object of the present invention is as follows, a partially prefabricated assembled post-lamination hollow floor, characterized in that it includes a cast-in-place floor bottom plate, a cast-in-place rib beam slab grid and a prefabricated slab. The cast-in-place floor bottom slab and the cast-in-place rib beam slab grid are formed by one-time pouring. The cast-in-place rib-beam slab grid is a grid-shaped rib plate criss-crossed on the upper surface of the cast-in-place floor slab, and each grid corresponds to a prefabricated slab.

Each of the prefabricated slabs closes the upper opening of a grid. There are gaps between adjacent prefabricated slabs, and these gaps form a criss-cross grid-like reserved slot channel grid. The lower part of the reserved seam channel grid is the upper end of the cast-in-place rib beam slab grid. When prefabricating the prefabricated slab, steel bar joints need to be reserved, and these steel bar joints are located in the grid of the reserved seam trenches.

Several tie bars are arranged in the grid of the cast-in-place rib beam slab. Stressed longitudinal reinforcement is laid in the trench grid of reserved seams. One end of these stressed longitudinal reinforcements is connected to the beam/column/wall around the grid of reserved slots. The lower ends of the tie bars hook the steel bars in the bottom slab of the cast-in-place floor, and the upper ends hook the stressed longitudinal bars. The secondary pouring is carried out in the grid of the reserved joints and trenches, and after the maintenance is completed, a partially prefabricated assembled hollow floor is formed.

Further, the prefabricated slab is surrounded by slopes.

Further, when laying stressed longitudinal reinforcement in the reserved slot trench grid, a stressed longitudinal reinforcement is laid at both ends of each channel of the reserved slot trench grid.

Further, one end of each stressed longitudinal reinforcement is connected to the concealed beams around the trench grid with reserved slots.

Further, the grid of the cast-in-place rib beam slab is surrounded by concealed beams and columns. The prefabricated slabs arranged around the grid of cast-in-place ribbed slabs are in contact with these concealed beams and columns.

Further, in the cast-in-place rib-beam slab grid, a tie bar is arranged at each criss-cross point.

The technical effect of the present invention is unquestionable. The inner mold material in the hollow floor is eliminated, and two new hollow floor structures are formed by secondary superimposed pouring during construction. This structural type will be able to solve all the above-mentioned problems existing in the traditional hollow floor without increasing the difficulty of construction.

The advantages of the present invention are as follows:

1) Due to the cancellation of the inner mold material, the engineering cost is reduced. This type of floor can be used for garages and long-span businesses, and the overall cost savings are large.

2) Save the construction period, the prefabricated slab can be constructed at another site at the same time as the floor cast-in-place bottom slab, the hoisting period is short and the cost is low.

3) The cast-in-place part of the hollow floor is the same as that of the ordinary ribbed floor, and the construction is simple. There is no need to install internal mold anti-floating steel bars, etc. The bottom of the floor can be poured densely, and the project quality can be more easily guaranteed.

4) The layout of the hollow body is flexible, and its position and size can be freely arranged according to the specific conditions of the plane. In the special-shaped slab area, the hollow rate is higher and the concrete material is saved, which can give full play to the advantages of the hollow floor.

5) When the design method is mature, the design of the hollow floor will be completed by the architectural design unit to reduce design management links.

Description of drawings

Figure 1 is a "partial" prefabricated post-lamination hollow floor;

Fig. 2 is a partial enlarged view of part L in Fig. 1;

Fig. 3 is a sectional view along A-A of Fig. 2 .

In the figure: cast-in-place floor slab 1, cast-in-place rib beam slab grid 2, tie bars 202, prefabricated slab 3, reserved joint trench grid 4, stressed longitudinal reinforcement 401, grid 5, concealed beam 6, column 7.

detailed description

The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

A partially prefabricated assembled post-lamination hollow floor, characterized in that it includes a cast-in-place floor floor 1, a cast-in-place rib beam slab grid 2 and a prefabricated flat plate 3. The cast-in-place floor slab 1 and the cast-in-place rib beam slab grid 2 are formed by one-time casting. The construction process is as follows: first support the bottom formwork and beam rib side formwork, tie the bottom plate and rib beam reinforcement, and then pour the bottom plate 1 and rib beam plate 2. The cast-in-place rib beam slab grid 2 is a criss-cross lattice-shaped rib plate on the upper surface of the cast-in-place floor slab 1 , and each grid 5 corresponds to a prefabricated flat plate 3 .

The prefabricated slab 3 is hoisted above the cast-in-place ribbed slab grid 2 by means of hoisting. Each of the prefabricated flat panels 3 closes the upper opening of a grid 5 . There are gaps between adjacent prefabricated slabs 3 , and these gaps form a criss-cross grid-shaped reserved slot channel grid 4 . Preferably, the prefabricated slab 3 is surrounded by slopes, so that the cross section of the reserved slot channel grid 4 is an inverted trapezoid as shown in FIG. 3 . The upper end of the cast-in-place rib beam slab grid 2 is located below the reserved seam channel grid 4 . When prefabricating the prefabricated slab 3 , it is necessary to reserve steel bar joints, and these steel bar joints are located in the reserved seam channel grid 4 .

Several tie bars 202 are arranged in the cast-in-place rib beam slab grid 2 . Stressed longitudinal reinforcements 401 are laid in the reserved seam channel grid 4 . One end of these stressed longitudinal reinforcements 401 is connected to the beams/columns/walls around the channel grid 4 with reserved slots. The lower end of the tie bar 202 hooks the steel bar in the cast-in-place floor slab 1 , and the upper end hooks the stressed longitudinal bar 401 . Preferably, in the cast-in-place rib beam slab grid 2, a tie bar 202 is arranged at each crisscross point.

Secondary pouring (pouring with fine stone concrete with a higher strength grade) is carried out in the reserved joint channel grid 4. After the maintenance is completed, a part of the prefabricated assembled post-lamination hollow floor is formed.

Referring to FIG. 1 , when laying stressed longitudinal reinforcement 401 in reserved slot trench grid 4 , a stressed longitudinal reinforcement 401 is laid at both ends of each channel of reserved slot trench grid 4 . The cast-in-place rib beam slab grid 2 is surrounded by concealed beams 6 and columns 7 . One end of each stressed longitudinal reinforcement 401 is connected to the hidden beams around the trench grid 4 with reserved slots. The prefabricated slabs 3 arranged around the cast-in-place ribbed slab grid 2 are in contact with these concealed beams and columns.

According to the engineering cost analysis, the part-fabricated post-lamination hollow floor proposed by the present invention is lower than the single cost of the traditional GBF all-in-place hollow floor. If the present invention can be widely used in projects with large spans such as garages and businesses, The savings will be considerable.

Claims (6)

1. a kind of partially prefabricated assembly type post-lamination hollow floor, it is characterized in that: comprise cast-in-place floor base plate (1), cast-in-place rib beam plate grid (2) and prefabricated slab (3); Described cast-in-place The floor bottom slab (1) and the cast-in-place rib beam slab grid (2) are cast in one time; plate, each grid (5) corresponds to a prefabricated flat plate (3); Each of the prefabricated flat panels (3) closes the upper opening of a grid (5); there are gaps between adjacent prefabricated flat panels (3), and these gaps form a criss-cross grid-like grid of reserved slots and channels (4); the lower part of the reserved seam channel grid (4) is the upper end of the cast-in-place rib beam slab grid (2); when prefabricating the prefabricated slab (3), it is necessary to reserve a reinforcement joint, These steel bar joints are located in the grid (4) of the reserved seam channel; A number of tie bars (202) are arranged in the cast-in-place rib beam slab grid (2); stressed longitudinal bars (401) are laid in the reserved joint channel grid (4); these stressed longitudinal bars (401 ) is connected to the beam/column/wall around the reserved seam trench grid (4); Stretch longitudinal reinforcement (401); carry out secondary pouring in the reserved seam channel grid (4), and after the curing is completed, a partially prefabricated assembled post-lamination hollow floor is formed. 2. A partially prefabricated assembled post-lamination hollow floor according to claim 1, characterized in that: the prefabricated slab (3) is surrounded by slopes. 3. A partially prefabricated assembled post-lamination hollow floor according to claim 1, characterized in that: when laying stressed longitudinal reinforcement (401) in the reserved seam channel grid (4), reserve A stressed longitudinal reinforcement (401) is laid at both ends of each channel of the slotted channel grid (4). 4. A partially prefabricated post-lamination hollow floor according to claim 1 or 3, characterized in that: one end of each stressed longitudinal reinforcement (401) is connected to the reserved seam channel grid (4 ) surrounding dark beam connections. 5. A partially prefabricated post-lamination hollow floor according to claim 1 or 4, characterized in that: the cast-in-place rib beam slab grid (2) is surrounded by concealed beams and columns; the cast-in-place rib beam Said prefabricated slabs (3) arranged around the slab grid (2) are in contact with these concealed beams and columns. 6. A partially prefabricated post-lamination hollow floor according to claim 1, 2 or 4, characterized in that: in the cast-in-place rib beam slab grid (2), each criss-cross point is arranged A Lajin (202).