CN115897785A - Permanent-temporary combined prefabricated integral casting structure and construction method thereof - Google Patents

Abstract

The embodiment of the application provides a prefabricated whole pouring structure with combined permanent facing and a construction method thereof, a prefabricated main beam and a prefabricated secondary beam are adopted, two ends of the prefabricated main beam are placed on steel rib corbels on a column top, two ends of the prefabricated secondary beam are placed in a placement groove which is formed in the prefabricated main beam in advance, bottom ribs of a cast-in-place transverse partition beam are placed in holes reserved in the prefabricated secondary beam, the column, the prefabricated main beam and the prefabricated secondary beam can be directly used as bearing members in a construction stage, a beam bottom support frame does not need to be additionally arranged, permanent facing conversion of a whole pouring structure system is efficiently realized, construction site labor and materials are greatly saved while structural safety is guaranteed, and construction period is shortened.

Description

Permanent-temporary combined prefabricated integral casting structure and construction method thereof

Technical Field

The invention relates to the field of building construction, in particular to a permanently-temporary combined prefabricated integral casting structure and a construction method thereof.

Background

Traditional prefabricated whole system of watering of multilayer needs to be under construction one deck post earlier and set up the breast support frame, and the one deck composite beam of hoist after one deck post concrete strength reaches, hoist prefabricated stull roof beam and secondary beam and be connected again, and the one deck floor and the second floor post of being under construction again, and two layers of laminated beams of hoist after two layers of post concrete strength reach, hoist prefabricated stull roof beam again and be connected with the secondary beam, and two layers of floors of construction are again carried out after two layers of roof beam installation is accomplished to this analogize, and the breast support frame all need be set up when every layer is built, need to consume more manual work and material, and the time limit for a project is longer.

Therefore, there is a need to develop a permanently-bonded prefabricated cast-in-place structure and a construction method thereof, so as to solve the above technical problems.

Disclosure of Invention

The embodiment of the invention provides a permanently-temporary combined prefabricated cast-in-place structure and a construction method thereof, and aims to solve the technical problems that a beam bottom support frame needs to be erected in a traditional multilayer prefabricated cast-in-place structure, more labor and materials are consumed, and the construction period is long.

The embodiment of the invention provides a permanently and temporarily combined prefabricated integral casting structure which comprises a floor slab, superposed beams for supporting the floor slab and columns; the superposed beam comprises a prefabricated main beam, a prefabricated secondary beam, a cast-in-situ transverse partition beam and a cast-in-situ superposed layer; a steel rib bracket which is expanded outwards towards the column body is formed at the top end of the column, and two ends of the prefabricated main beam are placed on the steel rib bracket; a placing groove for installing the prefabricated secondary beam is deepened in the front of the beam body of the prefabricated main beam, and placing heads matched with the placing groove are formed at two ends of the prefabricated secondary beam so that the prefabricated secondary beam can be placed on the prefabricated main beam in an overlapped mode; the cast-in-place transverse partition beam is a cast-in-place reinforced concrete beam, the length direction of the cast-in-place transverse partition beam is perpendicular to the length direction of the prefabricated secondary beam, and a hole for a bottom rib of the cast-in-place transverse partition beam to penetrate through is reserved on the beam body of the prefabricated secondary beam; the floor slab adopts a truss floor bearing plate as a support, and the truss floor bearing plate is placed on the prefabricated secondary beam; after the truss floor bearing plate is laid, inserting the reinforcing steel bars of the cast-in-place superposed layers, the gluten of the cast-in-place transverse partition beams and the reinforcing steel bars of the floor slab, and integrally casting the concrete of the cast-in-place superposed layers, the concrete of the cast-in-place transverse partition beams and the concrete of the floor slab after the inserting is finished.

Further, an angle steel is fixed on the beam body of the prefabricated secondary beam and is arranged below the hole; the bottom ribs of the cast-in-situ transverse partition beams are placed in the holes, the bottom die and the side dies are placed on the angle steel, and the bottom ribs are bound through the through holes.

Furthermore, the upper surface of the bottom die of the cast-in-place diaphragm beam is 2-3 cm lower than the bottom of the hole opening of the hole.

Furthermore, the column is a cast-in-situ steel rib concrete combined column, and steel ribs are embedded in post-cast reinforced concrete.

Furthermore, the prefabricated main beam adopts a prefabricated prestressed beam with an overhanging steel strand, and the overhanging steel strand stretches into the column for a certain length.

Further, when the prefabricated secondary beam is placed on the prefabricated main beam, the upper surface of the prefabricated secondary beam is higher than that of the prefabricated main beam.

In addition, the embodiment of the invention also provides a construction method of the permanently temporary combined prefabricated cast-in-place structure, which comprises the following steps:

(1) Hoisting the steel rib of the first layer of column, tying the rib to support a formwork and pouring concrete and removing the formwork to complete the establishment of the first layer of column;

(2) Hoisting a layer of prefabricated main beam, and placing two ends of the layer of prefabricated main beam on the steel rib corbels of the layer of column;

(3) Hoisting a layer of prefabricated secondary beam, and placing two ends of the layer of prefabricated secondary beam in a placing groove formed in advance by a layer of prefabricated main beam;

(4) Placing a bottom rib of a layer of cast-in-situ transverse partition beam in a hole reserved in a layer of prefabricated secondary beam, placing a bottom die and a side die on angle steel below the hole, and binding the bottom rib through a hole;

(5) Laying a layer of truss floor bearing plate on a layer of prefabricated main beam and a layer of prefabricated secondary beam;

(6) Inserting a layer of cast-in-situ laminated steel bar, a layer of cast-in-situ transverse beam gluten and a layer of floor slab steel bar;

(7) The concrete of the cast-in-place superposed layer, the concrete of the cast-in-place transverse beam and the concrete of the floor slab are integrally cast;

(8) And repeating the construction steps to complete the construction of two or more layers.

The embodiment of the invention has the following beneficial effects:

the prefabricated main beam and the prefabricated secondary beam are adopted, two ends of the prefabricated main beam are placed on the steel rib corbels on the top of the column, two ends of the prefabricated secondary beam are placed in the placement grooves formed in the prefabricated main beam in advance, the bottom ribs of the cast-in-place transverse partition beams are placed in holes reserved in the prefabricated secondary beam, the column, the prefabricated main beam and the prefabricated secondary beam can be directly used as bearing members in a construction stage, a beam bottom supporting frame does not need to be additionally arranged, permanent face conversion of a whole pouring structure system is efficiently realized, manpower and materials of a construction site are greatly saved while the structure safety is guaranteed, and the construction period is shortened.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a construction structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a bulk-casting structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of a laying structure of the end part of the prefabricated secondary beam in the embodiment of the invention;

FIG. 4 is a schematic construction diagram of a cast-in-place diaphragm beam in the embodiment of the present invention;

the figures in the drawings represent:

1. a floor slab; 11. a truss floor deck; 2. a laminated beam; 21. prefabricating a main beam; 211. a resting groove; 22. prefabricating a secondary beam; 221. placing the head; 222. a hole; 223. angle steel; 23. casting a transverse partition beam in situ; 231. a bottom rib; 232. bottom die; 233. gluten; 3. a column; 31. steel skeleton; 32. a steel skeleton bracket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention. In the present invention, unless otherwise specified, the terms of orientation such as "upper" and "lower" used herein generally refer to the upper and lower positions of the device in actual use or operation, and particularly to the direction shown in the drawings; while "inner" and "outer" are with respect to the outline of the device.

Referring to fig. 1 and 2, an embodiment of the present invention provides a permanently bonded precast monolithic structure, which includes a floor slab 1, superposed beams 2 supporting the floor slab 1, and columns 3. The column 3 is used as a main stressed member, and can be a cast-in-situ steel rib concrete combined column, and the steel ribs 31 are embedded in post-cast reinforced concrete. The top of post 3 is formed with the reinforcing bar bracket 32 that expands outward to the shaft, and reinforcing bar bracket 32 both can regard as the temporary resting point of beam-ends when the construction, makes things convenient for the hoist and mount of roof beam, can form enlarged connected node with the beam-ends after pouring again, improves beam column connected node's shear strength.

The composite beam 2 comprises a prefabricated main beam 21, a prefabricated secondary beam 22, a cast-in-situ transverse partition beam 23 and a cast-in-situ composite layer. Wherein, the two ends of the prefabricated main beam 21 are laid on the steel rib bracket 32, and the steel rib bracket 32 is used as a temporary laying point during construction. Further, the prefabricated main beam 21 in this embodiment is a prefabricated prestressed beam with an overhanging steel strand, and the overhanging steel strand extends into the column 3 for a certain length, so that the overhanging steel strand can be anchored in a connection node of the beam column after being poured, and the shear strength of the connection node of the beam column is improved.

As shown in fig. 3, the body of the precast main beam 21 is advanced to be deepened with a rest groove 211 for installing the precast secondary beam 22, and both ends of the precast secondary beam 22 are formed with rest heads 221 adapted to the rest groove 211, so that the precast secondary beam 22 can be stacked on the precast main beam 21 through the rest heads 221. In actual engineering, the total height of the main beam is often greater than that of the secondary beam, and in order to facilitate the advance prefabrication of the prefabricated main beam 21 and the prefabricated secondary beam 22, the heights of the prefabricated main beam 21 and the prefabricated secondary beam 22 are unified in the embodiment, so that the two side molds with unified height can be adopted during prefabrication and molding, and accordingly, when the prefabricated secondary beam 22 is placed on the prefabricated main beam 21, the upper surface of the prefabricated secondary beam 22 is higher than the upper surface of the prefabricated main beam 21, correspondingly, the height of the cast-in-situ superposed layer on the upper portion of the prefabricated main beam 21 is greater than that of the cast-in-situ superposed layer on the upper portion of the prefabricated secondary beam 22, the superposed layer steel bars are relatively more, and the prefabricated main beam 21 is slightly lower than the prefabricated secondary beam 22, so that the superposed layer can conveniently penetrate through the steel bars to a certain extent.

The length direction of the cast-in-place transverse partition beam 23 is perpendicular to the length direction of the prefabricated secondary beam 22, in this embodiment, the cast-in-place transverse partition beam 23 is a cast-in-place reinforced concrete beam, and a hole 222 for a bottom bar 231 of the cast-in-place transverse partition beam 23 to pass through is reserved on the beam body of the prefabricated secondary beam 22. Specifically, as shown in fig. 4, an angle steel 223 is fixed on the beam body of the prefabricated secondary beam 22, the angle steel 223 is arranged below the hole 222, and a bottom die 232 and side dies of the cast-in-situ diaphragm beam 23 rest on the angle steel 223. After the bottom mold keel and the mold plate are supported, the upper surface of the bottom mold 232 should be 2-3 cm lower than the bottom of the hole 222, so as to remain the thickness of the protective layer. The bottom rib 231 of the cast-in-situ diaphragm beam 23 penetrates through the hole 222 and is placed in the hole 222, the bottom rib 231 is punched and bound, a whole body can be formed by one span and multiple penetrations, the construction speed is high, and the transverse rigidity of the large-span prefabricated secondary beam 22 can be ensured.

The floor slab 1 uses the truss floor support plate 11 as a support, and the truss floor support plate 11 is directly placed on the prefabricated secondary beam 22. After the truss floor bearing plate 11 is laid, the steel bars of the cast-in-place laminated layers, the gluten 233 of the cast-in-place transverse beam 23 and the steel bars of the floor slab 1 are inserted, the concrete of the cast-in-place laminated layers, the concrete of the cast-in-place transverse beam 23 and the concrete of the floor slab 1 are integrally cast after the insertion, and the floor slab 1 and the laminated beam 2 are integrally cast to improve the integrity of the structure.

With continuing reference to fig. 1 and fig. 2, an embodiment of the present invention further provides a construction method of the permanently-bonded prefabricated cast-in-place structure, which is used for building a multi-layer prefabricated cast-in-place structure, and mainly includes the following steps:

(1) Hoisting the steel rib 31 of the first-layer column 3, tying the steel rib to support a formwork, pouring concrete and removing the formwork to complete the establishment of the first-layer column 3;

(2) Hoisting a layer of prefabricated main beam 21, and placing two ends of the layer of prefabricated main beam 21 on the steel rib corbels 32 of the layer of columns 3;

(3) Hoisting a layer of prefabricated secondary beam 22, and placing two ends of the layer of prefabricated secondary beam 22 in a placing groove 211 formed in advance by a layer of prefabricated main beam 21;

(4) Placing the bottom rib 231 of the layer of cast-in-situ diaphragm beam 23 in the hole 222 reserved in the layer of prefabricated secondary beam 22, placing the bottom die 232 and the side die on the angle steel 223 below the hole 222, and binding the bottom rib 231 through a through hole;

(5) Laying a layer of truss floor bearing plate 11 on a layer of prefabricated main beam 21 and a layer of prefabricated secondary beam 22;

(6) Inserting a layer of cast-in-situ laminated steel bar, a layer of cast-in-situ transverse beam gluten and a layer of floor slab steel bar;

(7) The construction of a one-layer cast-in-place structure is completed by integrally casting a layer of cast-in-place superposed layer concrete, a layer of cast-in-place diaphragm beam concrete and a layer of floor slab concrete;

(8) And repeating the construction steps to finish the construction of two or more layers.

This application directly utilizes prefabricated girder 21 and prefabricated secondary beam 22 as the bearing member of construction stage in the work progress, need not additionally to set up the beam bottom support frame, and the conversion is faced forever to the high-efficient whole structure system that waters of having realized, still practiced thrift the manual work and the material of job site greatly when guaranteeing structure safety, has shortened construction period.

The principle and the implementation of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. A permanently-temporary combined prefabricated integral casting structure comprises a floor slab, superposed beams for supporting the floor slab and columns; the method is characterized in that: the superposed beam comprises a prefabricated main beam, a prefabricated secondary beam, a cast-in-situ transverse partition beam and a cast-in-situ superposed layer; a steel rib bracket which is expanded outwards towards the column body is formed at the top end of the column, and two ends of the prefabricated main beam are placed on the steel rib bracket; a placing groove for installing the prefabricated secondary beam is deepened in the front of the beam body of the prefabricated main beam, and placing heads matched with the placing groove are formed at two ends of the prefabricated secondary beam so that the prefabricated secondary beam can be placed on the prefabricated main beam in an overlapped mode; the cast-in-place transverse partition beam is a cast-in-place reinforced concrete beam, the length direction of the cast-in-place transverse partition beam is perpendicular to the length direction of the prefabricated secondary beam, and a hole for a bottom rib of the cast-in-place transverse partition beam to penetrate through is reserved on the beam body of the prefabricated secondary beam; the floor slab adopts a truss floor bearing plate as a support, and the truss floor bearing plate is placed on the prefabricated secondary beam; after the truss floor bearing plate is laid, inserting the reinforcing steel bars of the cast-in-place superposed layers, the gluten of the cast-in-place transverse partition beams and the reinforcing steel bars of the floor slab, and integrally casting the concrete of the cast-in-place superposed layers, the concrete of the cast-in-place transverse partition beams and the concrete of the floor slab after the inserting is finished.

2. The permanently bonded precast structure of claim 1 wherein: angle steel is fixed on the beam body of the prefabricated secondary beam and is arranged below the hole; and bottom ribs of the cast-in-situ diaphragm beam are placed in the holes, a bottom die and side dies are placed on the angle steel, and bottom rib through holes are bound.

3. A permanently bonded precast structure according to claim 2 wherein: the upper surface of the bottom die of the cast-in-situ diaphragm beam is 2-3 cm lower than the bottom of the hole opening of the hole.

4. A permanently bonded precast structure according to claim 3 wherein: the column is a cast-in-situ steel rib concrete combined column, and steel ribs are embedded in post-cast reinforced concrete.

5. The permanently bonded precast structure of claim 4 wherein: the prefabricated main beam adopts a prefabricated prestressed beam with an overhanging steel strand, and the overhanging steel strand stretches into the column for a certain length.

6. The permanently bonded precast concrete structure of claim 5, wherein: when the prefabricated secondary beam is placed on the prefabricated main beam, the upper surface of the prefabricated secondary beam is higher than that of the prefabricated main beam.

7. A method of constructing a permanently bonded precast structure of claim 6 comprising the steps of:

(1) Hoisting the steel ribs of the first-layer column, binding the steel ribs to support a mold, pouring concrete and removing the mold to complete the establishment of the first-layer column;

(2) Hoisting a layer of prefabricated main beam, and placing two ends of the layer of prefabricated main beam on the steel rib corbels of the layer of column;

(3) Hoisting a layer of prefabricated secondary beam, and placing two ends of the layer of prefabricated secondary beam in a placing groove formed in the layer of prefabricated main beam in advance;

(4) Placing the bottom rib of the layer of cast-in-situ diaphragm beam in a hole reserved in the layer of prefabricated secondary beam, placing the bottom die and the side die on angle steel below the hole, and binding the bottom rib through a hole;

(5) Laying a layer of truss floor bearing plate on a layer of prefabricated main beam and a layer of prefabricated secondary beam;

(6) Inserting a layer of cast-in-place laminated layer steel bar, a layer of cast-in-place transverse beam gluten and a layer of floor slab steel bar;

(7) The concrete of the cast-in-place superposed layer, the concrete of the cast-in-place transverse beam and the concrete of the floor slab are integrally cast;

(8) And repeating the construction steps to finish the construction of two or more layers.

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