CN109025017A - Reinforced concrete hollow overlaps two-way ribbed slab floor and its method of construction - Google Patents

Abstract

The invention belongs to construction engineering technical fields, propose a kind of reinforced concrete hollow overlapping two-way ribbed slab floor and its method of construction, it is divided into ordinary reinforced concrete and two kinds of prestressed concrete, industrial and civil buildings flooring and the roof boarding for being 6 meters or more suitable for span.Reinforced concrete hollow overlaps two-way ribbed slab floor by several pieces of prefabricated reinforced concrete (or prestressed concrete) bottom plate assembling combinations with ribbing into floor bottom mould, bottom plate with ribbing is equipped with lightweight or hollow material to mitigate dead load, scene is poured concrete after being laid with vertical, horizontal girt strip reinforcing bar, becomes assembled integral reinforced concrete hollow overlapping two-way ribbed slab floor after the completion of construction and maintenance.The present invention meets the standardization of current building industrialization production, modularization requirement, and the equipment that current most of factories can be used is produced, simple production process.When prefabricated reinforced concrete bottom plate with ribbing is assembled at the scene, it is not required to formwork, it is only necessary to set a small amount of support, save a large amount of templates and artificial.

Description

Reinforced Concrete Hollow Composite Two-way Rib Floor and Its Construction Method

technical field

The invention belongs to the technical field of construction engineering, and specifically relates to a floor covering and its manufacturing and construction methods.

Background technique

The currently disclosed technical scheme of the reinforced concrete hollow composite floor used in the construction project is as follows:

(1) Chinese invention patent "a laminated floor slab (patent number 2015105065844)", which includes several prefabricated reinforced concrete slabs and T-beam slabs, at least one slab is spliced between two adjacent T-beam slabs, and they are passed through post-cast reinforced concrete The laminated floors form an integral laminated floor slab. It reduces the amount of concrete, self-weight, and cost through prestressing technology and the structure of two-way dense rib sandwich, and improves its own rigidity and bearing capacity. , reducing the influence of thermal bridges of the longitudinal and transverse ribs, and at the same time cooperating with lightweight filling blocks to improve the thermal insulation capacity of the present invention. When in use, the T-beam slabs and slabs are placed on the first-cast frame beams, and then the reinforced concrete laminated layer is poured later to form an integral laminated floor slab.

(2) Chinese utility model patent "Prefabricated Laminated Hollow Floor Slab (Patent No. 2012203740146)", its technical proposal is: the prefabricated laminated hollow floor slab has a cast-in-place layer and a prefabricated layer, and the prefabricated layer is arranged with truss reinforcement or concealed beam reinforcement, Hollow boxes or lightweight blocks are fixed between truss bars or concealed beam bars. At the construction site, re-cast concrete by placing steel bars on the prefabricated layer, embed the truss steel bars and hollow boxes or light weight blocks in the cast-in-place layer, and combine with the prefabricated layer to form an integral floor.

(3) Chinese invention patent "Assembled Concrete Two-Way Rib Floor and Its Construction Method (Patent No.: 2015108278128)", including concrete strip slabs, precast concrete strip hollow slabs, precast concrete trough blocks, and precast concrete hollows blocks, a total of four design, component prefabrication and installation construction methods. Its prefabricated concrete strip-shaped slabs and prefabricated concrete strip-shaped hollow slabs have a load-bearing function during construction and do not need to be supported; although their prefabricated concrete trough blocks and prefabricated concrete hollow blocks need support during construction, they need less support .

In the above disclosed patents, the implementation methods are all to fill the interior of the floor slab with light or hollow materials, so as to reduce the weight of the structure or achieve the effect of heat preservation. The focus and implementation methods are different;

Invention patent "a laminated floor slab (patent number 2015105065844)", according to its claims and patent specification, the laminated floor slab is a flat plate and a T-beam slab or a combination of the two. , the lower panel and the cross-arranged longitudinal and transverse ribs between the two. There are flanges along the length direction on both sides of the lower panel. The arrangement in the direction and the width direction divides the area between the upper and lower panels into several independent cavities; the transverse ribs are provided with a number of transverse rib grooves with upward openings, and transverse through holes are arranged in the transverse ribs, adjacent to each other. The two transverse rib grooves are connected through through holes; or the longitudinal rib belt is provided with several upwardly opening longitudinal rib grooves, the longitudinal rib belt is provided with longitudinal through holes, and two adjacent longitudinal rib grooves are connected through the through holes. Since this kind of flat plate has two layers of panels, the material consumption is large, the structure weight is large, the hollow rate is not high, and the longitudinal and horizontal ribs are all provided with rib grooves, and the component rigidity is small. Another flat panel disclosed in this patent includes a bottom panel and filling blocks, and the filling blocks are arranged on the bottom panel in a rectangular array. This kind of slab has low rigidity during demoulding, hoisting, transportation, and installation. When the span of the floor is large, the thickness of the bottom panel is large, which affects the height of the rib beam in the other direction, and its application value is limited. And in its claims, its longitudinal and transverse ribs are poured with lightweight aggregate structure thermal insulation concrete, the purpose of which is thermal insulation, but the requirements for thermal insulation of the floor in actual engineering are not high, and the use of lightweight aggregate concrete is inevitable. It will affect the stiffness and strength of the floor, and also reduce the scope of use of the floor.

Utility model patent "prefabricated laminated hollow floor slab (patent number 2012203740146)", the hollow floor slab is provided with hollow boxes or light weight blocks along the length of the truss bar, and the rigidity of this kind of slab is small in the process of demoulding, hoisting, transportation and installation , when the span of the floor was large, the thickness of the bottom panel was relatively large, which was essentially different from the inverted T-shaped plate of this patent. And finally the laminated plate that forms is one-way force transmission, does not propose the solution of two-way force, and this patent is different.

Invention patent "Assembled Concrete Two-way Rib Floor and Its Construction Method (Patent No. 2015108278128)", which involves the production method of precast concrete strip grooved slab and precast concrete strip hollow slab and the use of these two prefabricated The method of constructing two-way densely ribbed floor with slabs is complicated.

Contents of the invention

The technical problem to be solved by the present invention is: when producing hollow laminated floor slabs with large spans in the prior art, the rigidity of the components during production, transportation, construction and installation is insufficient, or due to the increase in the thickness of the bottom plate, it is impossible to bear two-way force, and there are also Because of the double-layer slab to increase the rigidity, the hollow rate is low, and the production and construction are difficult. For this reason, the present invention adopts the inverted T-shaped rib beam bottom plate to solve the above technical problems, and proposes an assembled integral reinforced concrete hollow laminated two-way compact structure that meets the requirements of standardization and modularization of prefabricated buildings, can be factory-produced, and assembled on the construction site. Rib floor and its construction method.

The technical scheme adopted in the present invention is: a reinforced concrete hollow laminated two-way densely ribbed floor is proposed, including a floor bottom formwork and a top plate, the floor bottom formwork is assembled from several pieces of concrete inverted T-shaped ribbed bottom plates, and the The concrete inverted T-shaped ribbed floor is formed by integral casting of the lower flat plate and longitudinal rib beams arranged along its length direction. The longitudinal rib beams are an inverted T-shaped structure. Grooves, the grooves of the longitudinal rib beams are horizontally aligned on the bottom formwork of the floor slab and arranged in rows to form transverse rib beam grooves intersecting with the longitudinal rib beams, and the transverse rib beam grooves are arranged in the transverse rib beam grooves , and the top of the transverse rib beam and the top of the longitudinal rib beam are flush on the same plane, the transverse rib beam and the longitudinal rib beam are filled with filling blocks in the grid formed by the bottom formwork of the floor slab, and the top plate is The cast-in-place floor is poured on the bottom formwork of the floor slab and the transverse rib beams to form a reinforced concrete hollow laminated two-way dense ribbed floor.

The concrete inverted T-shaped ribbed floor is an ordinary concrete inverted T-shaped ribbed floor or a prestressed concrete inverted T-shaped ribbed floor.

The filling blocks are made of lightweight or hollow materials.

The grooves are disconnected parts or openings arranged at intervals on the longitudinal rib beams, and the disconnected parts and the longitudinal rib beams on adjacent sides are connected by steel bars.

The longitudinal rib beams are all provided with upwardly protruding stirrups, the stirrups are closed rectangular or triangular stirrups, or U-shaped stirrups with openings upward, and the longitudinal rib beams are provided with epidermal longitudinal steel bars and lower skin longitudinal steel bars , the lower skin longitudinal steel bar protrudes from both ends of the longitudinal rib beam, and the lower skin longitudinal steel bar is prestressed or non-prestressed tendon.

Two-way reinforcement mesh sheets are arranged inside the lower flat plate, and transverse stiffeners are arranged on the lower flat plate.

Two-way steel mesh sheets are arranged inside the top plate.

The concrete inverted T-shaped ribbed bottom plate is provided with lifting rings or hanging parts.

The construction method of the reinforced concrete hollow laminated two-way densely ribbed floor includes the following two steps:

Step 1: Making a concrete inverted T-shaped ribbed floor, this step specifically includes the following steps:

(1-1), process molds according to the drawing size, make steel bars, customize or process filling blocks;

(1-2), Assemble the mold and lay steel bars;

(1-3), pouring the lower slab concrete, vibrating and compacting;

(1-4) Before the initial setting of the lower slab concrete, lay the filler block and connect it with the freshly poured lower slab concrete with special connectors;

(1-5), pouring longitudinal rib beam concrete;

(1-6), component maintenance, demoulding and storage;

Step 2: Floor construction and installation, this step specifically includes the following steps:

(2-1) Lay vertical temporary support, after leveling, hang the concrete inverted T-shaped ribbed floor;

(2-2) Lay horizontal rib beam stirrups and longitudinal reinforcement, lay longitudinal rib beam epidermis longitudinal reinforcement and roof bidirectional reinforcement mesh, and lay jointed reinforcement mesh between adjacent concrete inverted T-shaped ribbed bottom slabs ;

(2-3) After sealing the formwork gap, pour the transverse rib beam and roof concrete, vibrate and compact;

(2-4) After the concrete is cured to the specified strength, remove the vertical temporary support.

The concrete inverted T-shaped ribbed floor described in step 1 is an ordinary concrete inverted T-shaped ribbed floor or a prestressed concrete inverted T-shaped ribbed floor. When it is an ordinary concrete inverted T-shaped ribbed floor, the In step (1-2), specifically: assemble the mold on the factory’s fixed table mold or customized mold, and hang the assembled steel cage; when it is a prestressed concrete inverted T-shaped ribbed floor, step 1 In the step (1-2) of the above, the concrete is: assemble the mold on the fixed table formwork or the long line table in the factory, prestress the mold, and lay the prestressed steel bars.

The filling blocks are made of lightweight or hollow materials.

The beneficial effects of the present invention are reflected in:

1) Combined with the span situation, the prefabricated inverted T-shaped ribbed floor adopts the inverted T-shaped rib beam with intermittent or open holes. According to the span situation, it can also be equipped with transverse stiffeners to improve the rigidity of the slab. The slab is equipped with two-way steel mesh. It not only solves the problem of insufficient rigidity and strength of components in the stages of production, transportation and construction installation, but also can post-cast transverse rib beams to achieve the purpose of two-way force on the floor.

The prefabricated inverted T-shaped ribbed bottom plate of the present invention improves the rigidity and strength of the component, and avoids the possibility of damage during production, transportation and construction and installation.

2) Between the longitudinal and transverse rib beams of the prefabricated inverted T-shaped ribbed floor, light or hollow materials are installed in the factory or on the construction site to reduce the structural weight and facilitate construction. Lightweight or hollow materials are buried in blocks in the grid formed by the longitudinal and transverse rib beams of the prefabricated reinforced concrete (or prestressed concrete) ribbed floor, and the light or hollow materials are broken at the longitudinal and transverse rib beams to form a The grooves of the transverse rib beams are aligned with the discontinuities or openings of the longitudinal rib beams of the precast floor.

3) The prefabricated inverted T-shaped ribbed floor is transported to the construction site, installed in place, the remaining part of the longitudinal and transverse rib beams are laid, and then the concrete is poured and compacted. The ribbed floor, the prefabricated inverted T-shaped ribbed floor is easy to manufacture, the floor is installed on site, and the construction complexity is low, which is conducive to improving construction efficiency.

To sum up, the reinforced concrete hollow laminated two-way dense-rib floor of the present invention has good integrity, light weight, and a smooth and beautiful bottom surface. It is especially suitable for long-span floors and roofs of various buildings, and can also be used in places with large loads and spans such as underground garages and soil-covered roofs. At the same time, its design conforms to the traditional design habits and is convenient for popularization, and the present invention complies with the standardization and modularization requirements of the current industrialized production of buildings, and can be produced with the equipment of most current factories, and the production process is simple. In the construction method of the present invention, when the prefabricated reinforced concrete ribbed floor is assembled on site, no formwork is needed, and only a small amount of support is required, which saves a lot of formwork and labor.

Description of drawings

Figure 1 is a schematic axonometric view showing a prefabricated reinforced concrete (or prestressed concrete) inverted T-shaped ribbed floor of lightweight or hollow material.

Figure 2 is a schematic axonometric view of a prefabricated reinforced concrete (or prestressed concrete) inverted T-shaped ribbed floor without lightweight or hollow materials (the longitudinal ribs are connected at discontinuities).

Figure 3 is a schematic axonometric view of a prefabricated reinforced concrete (or prestressed concrete) inverted T-shaped ribbed floor without lightweight or hollow materials (longitudinal rib beam openings).

Fig. 4 is a schematic axonometric view of a floor slab bottom formwork assembled from several pieces of prefabricated reinforced concrete (or prestressed concrete) inverted T-shaped ribbed bottom slabs.

Figure 5 is a schematic axonometric view of the final reinforced concrete hollow laminated two-way densely ribbed floor after the prefabricated inverted T-shaped ribbed floor is assembled and assembled, then longitudinal and transverse rib beam reinforcement is laid and concrete is poured.

In the figure: 1-filling block, 2-longitudinal rib beam, 3-transverse rib beam, 4-top plate, 5-lower slab, 6-reinforcing bar, 7-stirrup, 8-lower skin longitudinal reinforcing bar, 9-transverse stiffener , 10-hanging ring or hanger, 11-transverse rib beam groove, 12-disconnection, 13-opening, 14-epithelial longitudinal reinforcement, 15-transverse rib beam reinforcement, 16-two-way reinforcement mesh.

Detailed ways

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

The reinforced concrete hollow laminated two-way densely ribbed floor as shown in Figure 5 includes a floor bottom formwork and a roof 4. The structure is shown in Figure 1-3. The concrete inverted T-shaped ribbed floor is an ordinary concrete inverted T-shaped ribbed floor or a prestressed concrete inverted T-shaped ribbed floor.

The concrete inverted T-shaped ribbed floor is formed by integral casting of the lower flat plate 5 and the longitudinal rib beams 2 arranged along its length direction. Wherein, the interior of the lower plate 5 is provided with a two-way steel mesh. According to the span, the lower plate 5 can be provided with transverse stiffeners 9 to improve the rigidity of the plate, and the floor slab may not be provided if the span is small. The longitudinal rib beams 2 are provided with upward protruding stirrups 7, and the stirrups 7 are closed rectangular or triangular stirrups, or U-shaped stirrups with an upward opening. The skin longitudinal reinforcement 8 and the lower skin longitudinal reinforcement 8 protrude from both ends of the longitudinal rib beam 2, which are prestressed or non-prestressed tendons. The longitudinal rib beam 2 adopts an inverted T-shaped structure. The longitudinal rib beam 2 is provided with a plurality of disconnected parts 12 (see Figure 2) or openings 13 (see Figure 3) at intervals along its length direction, and the disconnected parts and their adjacent sides The longitudinal rib beams 2 are connected by steel bars 6. The disconnected parts 12 or openings 13 of the longitudinal rib beams on the bottom formwork of the floor slab are horizontally aligned on the bottom formwork of the floor slab and arranged in rows to form transverse rib beam grooves 11 intersecting with the longitudinal rib beams 2, and the transverse rib beams The transverse rib beam 3 is arranged in the groove 11, and the top of the transverse rib beam 3 and the top of the longitudinal rib beam 2 are flush on the same plane, and the transverse rib beam 3 and the longitudinal rib beam 2 are filled with Filling block 1, the filling block 1 is made of light weight or hollow material.

The top slab 4 is a cast-in-place layer with two-way steel mesh 16 inside, which is poured on the bottom formwork of the floor slab and the transverse rib beam 3 to form a reinforced concrete hollow laminated two-way dense ribbed floor.

The concrete inverted T-shaped ribbed floor is also provided with necessary lifting rings or hangers 10 during production, transportation and installation, and the ribbed floor can be pre-set with necessary arching according to design requirements.

The construction method of the reinforced concrete hollow laminated two-way densely ribbed floor described above is divided into the following two steps according to component fabrication and construction and installation:

Step 1: Make concrete inverted T-shaped ribbed floor. In this step, the production of concrete inverted T-shaped ribbed floor is divided into two cases: ordinary reinforced concrete inverted T-shaped ribbed floor and prestressed concrete inverted T-shaped ribbed floor. to elaborate,

A. For ordinary reinforced concrete ribbed floor, the production method is as follows:

(1-1), process molds according to the drawing size, make steel bars, customize or process light or hollow materials;

(1-2). Assemble the mold on the fixed table formwork or customized mold in the factory, and hang the assembled steel cage;

(1-3), pour concrete on the lower slab 5, vibrate and compact;

(1-4). Before the initial setting of the concrete on the lower slab 5, lay the filler block and connect it with the newly poured lower slab concrete with special connectors;

(1-5), pouring concrete for longitudinal rib beam 2;

(1-6), component maintenance, demoulding and storage.

B. For the prestressed concrete ribbed floor, the production method is as follows:

(1-1), process molds according to the drawing size, make steel bars, customize or process light or hollow materials;

(1-2), Assemble the mold on the fixed table formwork or long line table in the factory, perform prestressed tension, and lay prestressed steel bars;

(1-3), pour concrete on the lower slab 5, vibrate and compact;

(1-4). Before the initial setting of the concrete on the lower slab 5, lay the filler block and connect it with the newly poured lower slab concrete with special connectors;

(1-5), pouring concrete for longitudinal rib beam 2;

(1-6), component maintenance, cut prestressed reinforcement, demoulding and storage.

Step 2: Floor construction and installation, this step specifically includes the following steps:

(2-1) Lay vertical temporary support, after leveling, hang the concrete inverted T-shaped ribbed floor;

(2-2) Lay 3 stirrups and longitudinal reinforcement of the transverse rib beam, lay the upper skin longitudinal reinforcement of the longitudinal rib beam 2 and the two-way reinforcement mesh of the top plate 4, and lay the joints between the adjacent concrete inverted T-shaped ribbed bottom plates steel mesh;

(2-3) After sealing the formwork gaps, pour the concrete of the transverse rib beam 3 and the top plate 4, and vibrate and compact it;

(2-4) After the concrete is cured to the specified strength, remove the vertical temporary support.

Claims (10)

1. reinforced concrete hollow overlaps two-way ribbed slab floor, it is characterised in that: including floor bottom mould and top plate (4), the building Plate bed die is formed by several block concrete inverted T-shapeds bottom plate assembling combination with ribbing, and the concrete inverted T-shaped bottom plate with ribbing is by lower flat Plate (5) and the longitudinal girt strip (2) arranged along its length is integrated poured forms, the longitudinal direction girt strip (2) is inverted T-shaped structure, It is spaced apart along its length on the longitudinal direction girt strip (2) and is equipped with several grooves, the groove of each longitudinal girt strip is at floor bottom It is laterally aligned and be arranged in rows on mould, form the lateral girt strip groove (11) arranged in a crossed manner with longitudinal girt strip (2), the cross rib Lateral girt strip (3) is set in beam groove (11), and flushes and is located at the top of the top of lateral girt strip (3) and longitudinal girt strip (2) In same plane, the transverse direction girt strip (3) and longitudinal girt strip (2) are filled with filling in the lattice that floor bottom mould is formed Block, the top plate (4) are in-situ layer, are poured in forming reinforced concrete hollow on the floor bottom mould and lateral girt strip (3) Overlap two-way ribbed slab floor.

2. reinforced concrete hollow according to claim 1 overlaps two-way ribbed slab floor, it is characterised in that: the concrete Inverted T-shaped bottom plate with ribbing is normal concrete inverted T-shaped bottom plate with ribbing or prestressed concrete inverted T-shaped bottom plate with ribbing.

3. reinforced concrete hollow according to claim 1 overlaps two-way ribbed slab floor, it is characterised in that: the filling block It is made of lightweight or hollow material.

4. reinforced concrete hollow according to claim 1 overlaps two-way ribbed slab floor, it is characterised in that: the groove is Spaced disconnecting unit or aperture on longitudinal girt strip (2) pass through between longitudinal girt strip (2) of the disconnecting unit side adjacent thereto Reinforcing bar connection.

5. reinforced concrete hollow according to claim 1 overlaps two-way ribbed slab floor, it is characterised in that: the longitudinal rib Beam (2) is provided with the stirrup (7) stretched out upwards, and stirrup (7) is closed rectangle or triangle u stirrup, or is opening upwards U tie muscle, longitudinal girt strip (2) is provided with epithelium longitudinal reinforcement (14) and hypodermis longitudinal reinforcement (8), hypodermis longitudinal direction steel Muscle (8) stretches out at longitudinal girt strip (2) both ends, and the hypodermis longitudinal reinforcement (8) is prestressing force or non-prestressing tendon.

6. reinforced concrete hollow according to claim 1 overlaps two-way ribbed slab floor, it is characterised in that: the lower flat Plate (5) is internally provided with two-way concrete slab mesh sheet, is provided with transverse stiffener (9) on the lower flat plate (5).

7. reinforced concrete hollow according to claim 1 overlaps two-way ribbed slab floor, it is characterised in that: the top plate (4) two-way concrete slab mesh sheet (16) are provided in.

8. the method for construction of reinforced concrete hollow overlapping two-way ribbed slab floor described in claim 1, including following two step It is rapid:

Step 1: production concrete inverted T-shaped bottom plate with ribbing, in the step specifically includes the following steps:

(1-1), by drawing dimensioned mold, production reinforcing bar, filling block is customized or processed；

(1-2), assembly mold are laid with reinforcing bar；

(1-3), casting lower flat plate (5) concrete, vibration compacting；

(1-4), before lower flat plate (5) concrete initial set, be laid with filling block, and with special connecting piece by its be just poured down The connection of portion's plate concrete；

(1-5), it is poured longitudinal girt strip (2) concrete；

(1-6), component conservation, demoulding and storage；

Step 2: floor construction installation, in the step specifically includes the following steps:

(2-1), it is laid with vertical temporary support, after leveling, hangs concrete inverted T-shaped bottom plate with ribbing；

(2-2), it is laid with lateral girt strip (3) stirrup and vertical muscle, is laid with the two-way steel that longitudinal girt strip (2) epithelium indulges muscle and top plate (4) Muscle mesh sheet, and the piece reinforced mesh being laid between adjacent concrete inverted T-shaped bottom plate with ribbing；

Behind (2-3), stopend gap, it is poured lateral girt strip (3) and top plate (4) concrete, vibration compacting；

After (2-4), concrete curing to prescribed strength, vertical temporary support is removed.

9. the method for construction of reinforced concrete hollow overlapping two-way ribbed slab floor according to claim 8, it is characterised in that: Concrete inverted T-shaped bottom plate with ribbing described in step 1 is normal concrete inverted T-shaped bottom plate with ribbing or prestressed concrete inverted T-shaped Bottom plate with ribbing, when its bottom plate with ribbing for normal concrete inverted T-shaped, in (1-2) step in step 1, specifically: in factory Fixed station mould or custom mold over-assemble mold, and hang the steel reinforcement cage combined；When it is prestressed concrete inverted T-shaped band When rib bottom plate, in (1-2) step in step 1, specifically: in the fixed station mould or long line platform over-assemble mold of factory, and it is right Mold carries out prestressed stretch-draw, is laid with deformed bar.

10. the method for construction of reinforced concrete hollow overlapping two-way ribbed slab floor according to claim 8, feature exist In: the filling block is made of lightweight or hollow material.