Reinforcing structure with disconnected sleeve grouting connecting steel bars inside prefabricated shear wall component and construction method thereof
Technical Field
The invention belongs to the field of building structures, and particularly relates to a reinforced structure with a cut-off sleeve connecting steel bar inside a prefabricated shear wall component and a construction method.
Background
In the research of the prefabricated concrete structure, the connection node of the prefabricated part is a theoretical weak link of the prefabricated concrete structure. The sleeve grouting connection is one of the most common connection forms of the vertical connection of the fabricated shear wall structure, so that the effective anchoring length of the grouting material in the sleeve and the extending reinforcing steel bars has an important influence on the stress of the vertical reinforcing steel bars and the engineering quality of the fabricated shear wall. At present, due to the fact that production precision of domestic prefabricated part factories is insufficient, installation level of field construction workers is low and the like, installation is difficult, some installation workers are prompted to adopt the situation that lower extending reinforcing steel bars are cut off to smoothly assemble prefabricated shear wall parts, and due to the fact that anchoring length of the reinforcing steel bars in the sleeves is insufficient, stressed reinforcing steel bars in the prefabricated wall boards cannot be effectively connected, and therefore the whole structure cannot achieve the same cast-in-place structural performance. It is necessary to reinforce the condition that the connecting steel bars in the sleeves are cut off in the assembled shear wall structure.
At the present stage, the research on a reinforcing method applied to the assembly type shear wall engineering in China is in a starting stage, a specific method for reinforcing the condition that the reinforcing steel bars inside the sleeve of the prefabricated shear wall member are cut off does not exist, and the condition that the reinforcing steel bars inside the sleeve are cut off by construction installers is very easy to occur in the field assembly process of the prefabricated shear wall member, so that a method capable of reinforcing the assembly type shear wall structure after the reinforcing steel bars inside the sleeve of the prefabricated shear wall member are cut off is urgently needed.
Disclosure of Invention
The invention aims to make up the defects of the existing prefabricated shear wall member reinforcing technology, and provides a reinforcing structure with a cut-off sleeve connecting steel bar inside a prefabricated shear wall member and a construction method thereof. Meanwhile, the reinforcing method has the characteristics of simplicity in manufacturing, convenience in construction and installation and the like, and has small influence on the original structure.
The technical scheme adopted by the invention is as follows: a reinforcing structure with cut-off sleeve connecting steel bars inside a prefabricated shear wall component comprises a prefabricated shear wall component double-side externally-adhered steel plate reinforcing structure and a prefabricated shear wall component single-side externally-adhered steel plate reinforcing structure;
the prefabricated shear wall component double-side externally-pasted steel plate reinforcing structure is adopted as a prefabricated shear wall I, and the prefabricated shear wall component single-side externally-pasted steel plate reinforcing structure is adopted as a prefabricated shear wall II.
The reinforcing structure of the prefabricated shear wall component with the externally-adhered steel plates on the two sides comprises an externally-adhered steel plate, structural adhesive, prefabricated shear wall holes, floor slab slotted holes, through screws, nuts and grouting material, the reinforcing structure is formed by oppositely pulling and anchoring two sides of a prefabricated shear wall component through externally-attached steel plates, the externally-attached steel plates penetrate through a floor slab through floor slab slotted holes and are bonded with a first prefabricated shear wall component through structural adhesive, a through screw is connected with the externally-attached steel plates through prefabricated shear wall holes of the first prefabricated shear wall component through nuts, grouting materials are filled in the prefabricated shear wall holes and the floor slab slotted holes of the first prefabricated shear wall component, the upper-layer prefabricated shear wall component and the lower-layer shear wall component form a whole through the externally-attached steel plates, the structural adhesive, the through screw, the nuts and the grouting materials, therefore, the anti-seismic performance of the prefabricated shear wall component cut off by the connecting steel bars in the sleeve is improved;
the reinforcing structure of the single-side externally-adhered steel plate of the prefabricated shear wall component comprises an externally-adhered steel plate, structural adhesive, prefabricated shear wall holes, floor slab slotted holes, bar-planting screws, nuts and grouting material, the reinforcing structure is characterized in that the reinforcing structure of the external steel plate at one side of the prefabricated shear wall component is formed by anchoring two prefabricated shear wall components at one side through the external steel plate and a bar-planting screw rod, the external steel plate penetrates through a floor slab slotted hole and is bonded with the two prefabricated shear walls through structural adhesive, one end of the bar-planting screw rod is embedded into the prefabricated shear wall hole, the other end of the bar-planting screw rod is connected with the external steel plate through a nut, the prefabricated shear wall hole and the floor slab slotted hole are filled with grouting material, the upper-layer prefabricated shear wall component and the lower-layer shear wall component form a whole through the external steel plate, the structural adhesive, the bar-planting screw rod, therefore, the anti-seismic performance of the prefabricated shear wall component cut off by the connecting steel bars in the sleeve is improved;
preferably, the grouting material is high-strength self-compacting concrete.
The construction method of the reinforced concrete superposed wall joint connecting structure comprises the following steps:
the first step is as follows: determining the width and thickness of an externally-attached steel plate and the number and position of the externally-attached steel plates according to the size of a connecting steel bar cut off from a sleeve inside a prefabricated shear wall component, forming prefabricated shear wall holes on the surface of a prefabricated shear wall I or a prefabricated shear wall II to be reinforced, and forming floor slab slotted holes on one side of the prefabricated shear wall and floor slab slotted holes on one side of the prefabricated shear wall II according to the width of the steel plates;
the second step is that: through screws are arranged through holes in the surface of the prefabricated shear wall I, or bar planting screws are arranged through holes in the surface of the prefabricated shear wall II;
the third step: penetrating an externally-attached steel plate through a slotted hole of a floor slab, and bonding the two sides of the first prefabricated shear wall with the wall body by using structural adhesive, or bonding the single side of the second prefabricated shear wall with the wall body by using structural adhesive;
the fourth step: the through screw and the external steel plate are respectively anchored by nuts at two sides, or the bar-planting screw and the external steel plate are anchored by nuts at one side;
the fifth step: and (3) erecting a formwork at the prefabricated shear wall I or the prefabricated shear wall II and the floor slab hole, then pouring grouting materials at the prefabricated shear wall hole and the floor slab grooving hole, and finishing the final reinforcing structure after the grouting materials are cured. Therefore, the upper and lower layers of prefabricated shear wall components are tightly combined together, and the seismic performance of the prefabricated shear wall is enhanced.
Has the advantages that: the reinforcing method solves the safety problem that the sleeve connecting steel bar is cut off in the installation and construction process of the prefabricated shear wall component within a reasonable and controllable economic range. The reasonable design that the steel bars in the prefabricated shear wall component sleeve are cut off and the steel plates are attached to the outside for through anchoring is adopted, so that the problem that the steel bars in the prefabricated shear wall component sleeve are cut off in the assembling process due to the fact that construction is not standardized can be solved, the bearing capacity and the anti-seismic performance of the prefabricated shear wall are improved, and the defect that the existing assembly type shear wall cannot be reinforced due to the installation quality problem is overcome. Meanwhile, the method has the advantages of small damage to the original structure, simple reinforcing connection mode, low reinforcing cost, convenience for practical engineering application and remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic structural view of an externally attached steel plate of a prefabricated shear wall component according to the present invention;
FIG. 2 is a cross-sectional view of a two-sided externally attached steel plate;
fig. 3 is a cross-sectional view of a single-sided externally-attached steel plate.
Detailed Description
The invention will be further described with reference to the following drawings and detailed description:
as shown in fig. 1, 2 and 3: a reinforcing structure with cut-off sleeve connecting steel bars inside a prefabricated shear wall component comprises a prefabricated shear wall component double-side externally-adhered steel plate reinforcing structure and a prefabricated shear wall component single-side externally-adhered steel plate reinforcing structure;
the reinforcing structure is characterized in that the reinforcing structure is a first prefabricated shear wall 9 and the reinforcing structure is a second prefabricated shear wall 10.
The reinforcing structure of the external steel plates attached to the two sides of the prefabricated shear wall component comprises an external steel plate 1, structural adhesive 2, prefabricated shear wall holes 3, floor slab slotted holes 4, through screws 5, nuts 6 and grouting materials 7, the reinforcing of the externally-adhered steel plates at the two sides of the prefabricated shear wall component is formed by oppositely pulling and anchoring two sides of a prefabricated shear wall I9 through externally-adhered steel plates 1, the externally-adhered steel plates 1 penetrate through a floor slab through floor slab slotted holes 4 and are bonded with the prefabricated shear wall I9 through structural adhesive 2, the through screw rods 5 are connected with the externally-adhered steel plates 1 through prefabricated shear wall holes 3 by nuts, grouting materials 7 are filled in the prefabricated shear wall holes 3 and the floor slab slotted holes 4, the upper-layer prefabricated shear wall component and the lower-layer shear wall component form a whole through the externally-adhered steel plates 1, the structural adhesive 2, the through screw rods 5, the nuts 6 and the grouting materials 7, therefore, the anti-seismic performance of the prefabricated shear wall component cut off by the connecting steel bars in the sleeve is improved;
the reinforcing structure of the single-side externally-bonded steel plate of the prefabricated shear wall component comprises an externally-bonded steel plate 1, structural adhesive 2, prefabricated shear wall holes 3, floor slab slotted holes 4, bar-planting screws 8, nuts 6 and grouting materials 7, the reinforcing structure is characterized in that the reinforcing structure of the one-side externally-attached steel plate of the prefabricated shear wall component is formed by anchoring one side of a prefabricated shear wall II 10 through an externally-attached steel plate 1 and a bar-embedded screw 8, the externally-attached steel plate 1 penetrates through a floor slab slotted hole 4 and is bonded with the prefabricated shear wall II 10 through structural adhesive 2, one end of the bar-embedded screw 8 is embedded into a prefabricated shear wall hole 3, the other end of the bar-embedded screw is connected with the externally-attached steel plate 1 through a nut 6, the prefabricated shear wall hole 3 and the floor slab slotted hole 4 are filled with grouting material, the upper-layer prefabricated shear wall component and the lower-layer shear wall component form a whole through the externally-attached steel plate 1, the structural adhesive 2, therefore, the anti-seismic performance of the prefabricated shear wall component cut off by the connecting steel bars in the sleeve is improved;
the outer steel plate 1 can cut off the diameter of the steel bar and set the width and the thickness according to the sleeve, and penetrate through the floor slab.
The grouting material 7 is high-strength self-compacting concrete.
A construction method of a reinforced structure with a cut-off sleeve connecting steel bar inside a prefabricated shear wall component comprises the following steps:
the first step is as follows: determining the width and thickness of an externally-attached steel plate 1 and the number and position of the externally-attached steel plates 1 according to the size of a connecting steel bar of a sleeve in a prefabricated shear wall component, forming prefabricated shear wall holes 3 on the surfaces of a first prefabricated shear wall 9 or a second prefabricated shear wall 10 to be reinforced, forming floor slab slotted holes 4 on one side of the prefabricated shear wall and forming floor slab slotted holes 4 on one side of the second prefabricated shear wall according to the width of the steel plates;
the second step is that: through screw rods 5 are arranged in the prefabricated shear wall holes 3 on the surface of the prefabricated shear wall I9, or bar planting screw rods 8 are arranged in the prefabricated shear wall holes 3 on the surface of the prefabricated shear wall II 10;
the third step: penetrating an external steel plate 1 through a floor slab slotted hole 4, and bonding the two sides of a first prefabricated shear wall 9 with a wall body by using structural adhesive, or bonding the single side of a second prefabricated shear wall 10 with the wall body by using structural adhesive 2;
the fourth step: anchoring the through screw rod 5 and the outer steel plate 1 at two sides by nuts 6 respectively, or anchoring the bar-planting screw rod 8 and the outer steel plate 1 at one side by nuts;
the fifth step: and (3) formwork supporting is carried out at the prefabricated shear wall hole 3 and the floor slab slotted hole 4, then grouting material 7 is poured at the prefabricated shear wall hole 3 and the floor slab slotted hole 4, and the final reinforcing structure is completed after the grouting material 7 is cured. Therefore, the upper and lower layers of prefabricated shear wall components are tightly combined together, and the seismic performance of the prefabricated shear wall is enhanced.
The embodiments of the present invention are described in detail with reference to the drawings, but the present invention is not limited to the described embodiments, and it will be apparent to those skilled in the art that several modifications and variations can be made within the principle and technical spirit of the present invention, and these modifications and variations should be regarded as the protection scope of the present invention.