CN106836592B

CN106836592B - Partially prefabricated assembled rear-superposed hollow floor

Info

Publication number: CN106836592B
Application number: CN201710122555.7A
Authority: CN
Inventors: 皮天祥; 左睿直; 皮绪华; 梁恒; 赵健新
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2017-03-03
Filing date: 2017-03-03
Publication date: 2020-02-11
Anticipated expiration: 2037-03-03
Also published as: CN106836592A

Abstract

The invention discloses a partially prefabricated assembled rear superposed hollow floor, which comprises a cast-in-place floor base plate, a cast-in-place rib beam plate grid and a prefabricated flat plate. Firstly, supporting bottom moulds and beam rib side moulds, binding bottom plates and rib beam reinforcing steel bars, then pouring hollow floor bottom plates and rib beam concrete, reserving construction joints to the bottom of a top plate, then hoisting flat plates which are prefabricated in advance and correspond to hollow sizes to the tops of rib beams, then placing stressed longitudinal bars connected with hidden beams at corresponding positions of the rib beams, and finally pouring rib beam positions between the flat plates for the second time, thus finishing the maintenance. The invention cancels the internal mold material in the hollow floor, and adopts two novel hollow floor structures which are formed by secondary superposition pouring during construction. The structural form can solve all the problems of the traditional hollow floor system, and simultaneously, the construction difficulty is not increased.

Description

Partially prefabricated assembled rear-superposed hollow floor

Technical Field

The invention relates to the field of fabricated buildings, in particular to a hollow floor.

Background

The hollow floor has better application prospect in large-span garages, businesses, squares and partial large-plate structures due to the small structure height and large space rigidity, and the design cost is more economic than that of the common rib beam floor.

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

(1) the inner mold material provided by each hollow floor inner mold supplier has no uniform specification standard, the current thinning design of the hollow floor can be only executed by the inner mold supplier according to the unique material, the inner mold supplier is usually determined by a construction general packet unit, and under the condition that a construction drawing is not shown and the construction general packet unit is not determined, the inner mold supplier is required to carry out the thinning design of the hollow floor in advance, so that disorder occurs on the management procedure;

(2) the inner mould suppliers monopolize the respective inner mould supply materials, so that the inner mould material cost is higher, a certain proportion of construction matching cost of the total package unit is paid during implementation, and the engineering cost is greatly increased;

(3) the concrete of the bottom plate of the full cast-in-place concrete hollow floor is difficult to pour compactly and uniformly, and the engineering quality is greatly influenced;

(4) because the engineering plane shapes of most garages and the like are irregular, the specification and the size of the internal mold material limit the free arrangement of the hollow position in the hollow floor system, so that many parts such as corners and the like need to be made into solid, and the engineering cost is increased more.

(5) The full cast-in-place concrete hollow floor system has the advantages of large field wet operation, longer construction period and lower industrialization degree.

Disclosure of Invention

The invention aims to solve a series of problems caused by the use of an internal mold in the construction of the existing hollow floor. The hollow floor slab is provided with two novel hollow floor slab structures which are formed by secondary superposition pouring without using an internal mold material in the hollow floor slab.

The technical scheme adopted for achieving the purpose of the invention is that the partially prefabricated and assembled type post-laminated hollow floor is characterized by comprising a cast-in-place floor slab, a cast-in-place rib beam slab grid and a prefabricated flat plate. The cast-in-situ floor slab and the cast-in-situ rib beam slab lattice are cast and formed at one time. The grid of the cast-in-situ ribbed beam slab is a latticed ribbed slab criss-cross on the upper surface of the cast-in-situ floor slab, and each latticed rib corresponds to one prefabricated flat plate.

And each prefabricated flat plate closes the upper end opening of one grid. Gaps are arranged between the adjacent prefabricated flat plates, and the gaps form criss-cross latticed reserved gap channel grids. The lower part of the reserved slot channel grid is the upper end of the cast-in-place rib beam plate grid. When the prefabricated flat plate is prefabricated, steel bar joints are required to be reserved and are positioned in the reserved seam channel grids.

And a plurality of tie bars are arranged in the grid of the cast-in-situ rib beam plate. And stress longitudinal ribs are laid in the reserved seam channel grids. One end of the stressed longitudinal ribs is connected with the beam/column/wall body around the reserved slot channel grid. The lower end of the tie bar hooks the steel bar in the cast-in-situ floor slab, and the upper end of the tie bar hooks the stressed longitudinal bar. And performing secondary pouring in the reserved slot channel grids, and forming a partially prefabricated and overlapped hollow floor after maintenance.

Furthermore, the periphery of the prefabricated flat plate is provided with slope surfaces.

Furthermore, when the stressed longitudinal ribs are laid in the reserved slot channel grids, two ends of each channel of the reserved slot channel grids are respectively provided with one stressed longitudinal rib.

Furthermore, one end of each stressed longitudinal rib is connected with the hidden beam around the reserved slot channel grid.

Furthermore, the periphery of the cast-in-place rib beam plate grid is provided with hidden beams and columns. The prefabricated flat plates arranged around the cast-in-place rib beam plate grid are in contact with the hidden beams and the columns.

Furthermore, in the cast-in-place rib beam plate grid, each criss-cross point is provided with a lacing wire.

The invention has the technical effects that the invention undoubtedly cancels the internal mold material in the hollow floor system, and adopts two novel hollow floor system structures which are formed by secondary superposition pouring during construction. The structural form can solve all the problems of the traditional hollow floor system, and simultaneously, the construction difficulty is not increased.

The invention has the following advantages:

1) because the inner mould material is cancelled, the engineering cost is reduced. The garage and the large-span business can adopt the floor system, and the total cost is greatly saved.

2) The construction period is saved, the prefabricated flat plate and the floor cast-in-place bottom plate can be constructed in another field at the same time, the hoisting construction 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 common rib beam floor, the construction is simple and convenient, internal mold anti-floating reinforcing steel bars and the like are not needed to be arranged, the floor base plate can be poured compactly, and the engineering quality is easier to ensure.

4) The hollow bodies are arranged flexibly, and the positions and the sizes of the hollow bodies can be freely arranged according to the specific situation of a plane. In the special-shaped plate area, the hollow rate is higher, the concrete material is more saved, and the advantages of the hollow floor system can be fully exerted.

5) After the design method is mature, the design of the hollow floor is finished by a building design unit together, and the design management links are reduced.

Drawings

FIG. 1 is a partially prefabricated rear superposed hollow floor;

FIG. 2 is an enlarged view of a portion L of FIG. 1;

fig. 3 is a sectional view a-a of fig. 2.

In the figure: the cast-in-situ floor slab comprises a cast-in-situ floor slab base plate 1, a cast-in-situ rib beam slab grid 2, a tie bar 202, a prefabricated flat plate 3, a reserved seam channel grid 4, stressed longitudinal bars 401, lattices 5, hidden beams 6 and columns 7.

Detailed Description

The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.

A partially prefabricated assembled rear-superposed hollow floor is characterized by comprising a cast-in-place floor base plate 1, a cast-in-place rib beam plate grid 2 and a prefabricated flat plate 3. The cast-in-place floor slab bottom plate 1 and the cast-in-place rib beam slab grid 2 are formed in a one-time pouring mode. The construction process comprises the following steps: firstly, supporting bottom moulds and beam rib side moulds, binding bottom plates and rib beam reinforcing steel bars, and then pouring a bottom plate 1 and a rib beam plate 2. The cast-in-place ribbed beam slab lattice 2 is a latticed ribbed plate which is criss-cross on the upper surface of the cast-in-place floor slab 1, and each lattice 5 corresponds to one prefabricated flat plate 3.

And hoisting the prefabricated flat plate 3 above the cast-in-place rib beam plate grid 2 by adopting a hoisting mode. Each of the prefabricated panels 3 closes the upper opening of one of the cells 5. Gaps are arranged between the adjacent prefabricated flat plates 3, and the gaps form criss-cross grid-shaped reserved gap channel grids 4. Preferably, the periphery of the prefabricated flat plate 3 is provided with slope surfaces, so that the section of the pre-slit channel grid 4 is an inverted trapezoid as shown in fig. 3. The upper end of the cast-in-situ rib beam plate grid 2 is arranged below the reserved slot channel grid 4. When prefabricating the precast slab 3, reinforcement joints are required to be reserved, and the reinforcement joints are located in the reserved joint channel grids 4.

And a plurality of tie bars 202 are arranged in the cast-in-situ rib beam plate grid 2. And stress longitudinal ribs 401 are paved in the reserved slot channel grids 4. One end of each stressed longitudinal rib 401 is connected with the beam/column/wall body around the reserved slot channel grid 4. The lower end of the tie bar 202 hooks the steel bar in the cast-in-situ 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 configured at each criss-cross point.

And (3) performing secondary pouring (pouring by adopting fine stone concrete with a higher strength grade) on the reserved seam channel grids 4, and forming a part of prefabricated and overlapped hollow floor after curing.

Referring to fig. 1, when the stressed longitudinal ribs 401 are laid in the reserved slot channel grid 4, two ends of each slot of the reserved slot channel grid 4 are each laid with one stressed longitudinal rib 401. The periphery of the cast-in-place rib beam plate grid 2 is provided with a hidden beam 6 and a column 7. One end of each stressed longitudinal rib 401 is connected with the hidden beam around the reserved slot channel grid 4. The prefabricated flat plates 3 arranged around the cast-in-place rib beam plate grid 2 are in contact with the hidden beams and the columns.

Through engineering cost analysis, the partially assembled post-laminated hollow floor system has lower single-component manufacturing cost than the traditional GBF full-cast-in-place hollow floor system, and the cost saved by the partially assembled post-laminated hollow floor system is considerable if the partially assembled post-laminated hollow floor system can be widely used in large-span projects such as garages, businesses and the like.

Claims

1. A partially prefabricated assembled rear superposed hollow floor is characterized by comprising a cast-in-place floor base plate (1), a cast-in-place rib beam plate grid (2) and a prefabricated flat plate (3); the cast-in-place floor slab bottom plate (1) and the cast-in-place rib beam slab grids (2) are formed in a one-step pouring mode; the cast-in-place rib beam slab lattice (2) is a latticed rib plate which is criss-cross on the upper surface of the cast-in-place floor slab base plate (1), and each latticed rib plate (5) corresponds to one prefabricated flat plate (3);

each prefabricated flat plate (3) closes the upper end opening of one grid (5); gaps are arranged between the adjacent prefabricated flat plates (3), and the gaps form criss-cross latticed reserved gap channel grids (4); the lower part of the reserved slot channel grid (4) is the upper end of the cast-in-situ rib beam plate grid (2); when the precast slab (3) is precast, steel bar joints are required to be reserved and are positioned in the reserved seam channel grids (4);

a plurality of tie bars (202) are arranged in the cast-in-place rib beam plate grid (2); stress longitudinal ribs (401) are paved in the reserved seam channel grids (4); one end of each stressed longitudinal rib (401) is connected with a beam/column/wall body around the reserved seam channel grid (4); the lower end of the tie bar (202) hooks a steel bar in the cast-in-place floor slab base plate (1), and the upper end hooks the stressed longitudinal bar (401); and (3) performing secondary pouring in the reserved slot channel grid (4), and forming a partially prefabricated and overlapped hollow floor after maintenance.

2. The partially prefabricated assembled rear-folding hollow floor system according to claim 1, wherein: the periphery of the prefabricated flat plate (3) is provided with a slope surface.

3. The partially prefabricated assembled rear-folding hollow floor system according to claim 1, wherein: when the stressed longitudinal ribs (401) are laid in the reserved seam channel grids (4), two ends of each channel of the reserved seam channel grids (4) are respectively provided with one stressed longitudinal rib (401).

4. A partially prefabricated assembled rear superposed hollow floor system according to claim 1 or 3, characterised in that: one end of each stressed longitudinal rib (401) is connected with the hidden beam around the reserved slot channel grid (4).

5. The partially prefabricated assembled rear-folding hollow floor system according to claim 1, wherein: hidden beams and columns are arranged around the cast-in-place rib beam plate grid (2); the prefabricated flat plates (3) arranged around the cast-in-place rib beam plate grid (2) are in contact with the hidden beams and the columns.

6. The partially prefabricated assembled rear-folding hollow floor system according to claim 1, wherein: in the cast-in-place rib beam plate grid (2), each criss-cross point is provided with a lacing wire (202).