CN102966245A - Connecting method of steel beam and existing reinforced concrete column - Google Patents

Abstract

The invention relates to a connecting method of a steel beam and an existing reinforced concrete column, which can be used for reinforced modification of an existing reinforced concrete structure, and belongs to the technical field of structural engineering. The method comprises the steps of: scabbling, planting bars and binding reinforced mesh pieces on the surface around with a node connection domain of the original reinforced concrete column; processing two pieces of channel steel and welding a stud connection piece inside; extending an extending bracket and external reinforcing plate on the channel steel connected to the steel beam; buckling the two pieces of channel steel and wrapping the original reinforced concrete column; welding in an abut manner; pouring node area concrete; and finally connecting the steel beam. The method overcomes the deficiencies of the conventional connection method, is simple in structure, quick and convenient to construct, good in stress performance of the connecting node, reliable in force transfer, and can efficiently prevent a node core area from cracking and being exposed. The core area concrete is wrapped by a steel plate so that the concrete is strongly constrained, and the quake-proof ductility of the node is good. The method has high practicality and wide application prospect.

Description

The method of attachment of a kind of girder steel and existing reinforced concrete post

Technical field

The present invention relates to the method for attachment of a kind of girder steel and existing reinforced concrete post, belong to technical field of structural engineering.

Background technology

Existing building is carried out strengthening reconstruction, is the effective way that improves structural bearing capacity, rigidity and durability, increases the service life, promotes the use function.Steel work or steel-concrete combined structure have from advantages such as heavy and light, construction hoisting are convenient, anti-seismic performance is good, industrialization degree is high, environmental effect is good, and the strengthening reconstruction that is used for existing building has broad application prospects; And traditional concrete structure economic performance is good, and has good compressive property, is used for still having advantage take resistance to compression as main pillar.Therefore, strengthening reconstruction for existing concrete structure, often adopt the local replacement of steel work or combining structure or local enlarging floor system, and keep simultaneously former steel concrete post, at this moment, the connectivity problem of girder steel and existing reinforced concrete post becomes one of crucial difficult problem of this type of strengthening reconstruction design.

The method of attachment of traditional girder steel and existing reinforced concrete post is that encased steel plate adds split bolt or bar planting, and not only construction is complicated, and larger to the core space concrete destruction, and anti-earthquake ductility is poor, and node area power transmission reliability is relatively poor, and difficult quality guarantee.Therefore, the connectivity problem of girder steel and existing reinforced concrete post has become a bottleneck difficult problem that adopts steel work or combining structure strengthening reconstruction existing reinforced concrete structure, needs at present a kind of simple and practical new method of research and development badly and realizes reliable connection between girder steel and the existing reinforced concrete post.

Summary of the invention

The object of the invention is to for deficiency of the prior art, propose a kind of simple structure, easy construction, power transmission is reliable, anti-earthquake ductility is good girder steel and the method for attachment of existing reinforced concrete post.

Technical scheme of the present invention is as follows:

The method of attachment of a kind of girder steel and existing reinforced concrete post, the method comprises the steps:

1) plants into the L-type bar dowel, at the peripheral assembling reinforcement net of L-type bar dowel sheet in former steel concrete post node link field scope inner surface dabbing, and at the dabbing place;

2) two U-steels of processing are at the inboard weld stud connector of U-steel; To connect the overhanging bracket of U-steel outside welding of girder steel one side, described overhanging bracket is comprised of top flange plate, bottom wing listrium and web; In the relevant position punching that web is connected with girder steel, top flange plate and the bottom wing listrium outside are welded with external reinforcing plate for car, and external reinforcing plate for car is with the U-steel outside welding that connects girder steel one side;

3) with the former steel concrete post of two U-steel make-ups outsourcing, and continuous with butt weld, the node area concreting;

4) after the node area concrete reaches intensity, hoisting steel beam, overhanging bracket web and steel beam web plate is affixed by high-strength bolt and junction plate, whether the upper and lower frange plate of the top flange plate of overhanging bracket and bottom wing listrium and girder steel welds, and realizes respectively rigidly connecting or being articulated and connected of girder steel and former steel concrete post.

The present invention has following beneficial effect with respect to prior art:

(1) this method of attachment simple structure, easy construction.The U-steel that adopts is drawn materials conveniently, and steel work is prefabricated in the factory, and on-the-spot installation rate is fast, and concrete wet trade amount is little, and is little to surrounding environment influence; (2) connection structure stress performance is good, and power transmission is reliable.The stiffener at place, upper bottom flange transmits moment of flexure, steel plate and concrete composite interface and new-old concrete bar planting interface Transfer of Shear, and force path is clear and definite; (3) steel plate external wrapping concrete, avoid the node area crack to expose, and the node area sectional area strengthens, significantly improve the shear-carrying capacity of joint cores, be conducive to realize the aseismatic design concept of " the weak member of strong node ", encased steel plate produces effect of contraction to the core space concrete simultaneously, makes node have superior anti-earthquake ductility.

Description of drawings

Fig. 1 is overall schematic of the present invention.

Fig. 2 is that the present invention plants the muscle schematic diagram in former concrete column surface dabbing.

Fig. 3 is assembling reinforcement net sheet schematic diagram of the present invention.

Fig. 4 is the U-steel of peg connector, overhanging bracket and the external reinforcing plate for car schematic diagram of being welded with of the present invention.

Fig. 5 is mounting groove shaped steel schematic diagram of the present invention.

Fig. 6 is that the present invention builds the node area concrete, external girder steel schematic diagram.

Among the figure: the former steel concrete post of 1-; 2-L type bar dowel; The 3-reinforced mesh; The 4-U-steel; 5-peg connector; The overhanging bracket of 6-; The 7-top flange plate; 8-bottom wing listrium; The 9-web; The perforate of 10-web; The 11-external reinforcing plate for car; The 12-butt weld; 13-node area concrete; The 14-girder steel; The 15-high-strength bolt; The 16-junction plate.

The specific embodiment

Below in conjunction with accompanying drawing, structure of the present invention, processing and use procedure are further described.

Figure 1 shows that overall schematic of the present invention.The Specific construction step is as follows:

1) surrounded surface dabbing in former steel concrete post 1 node link field scope, and plant into L-type bar dowel 2 at the dabbing place, as shown in Figure 2, at the peripheral assembling reinforcement net of L-type bar dowel sheet 3, as shown in Figure 3.

2) as shown in Figure 4, process two U-steels 4, and at the inboard weld stud connector 5 of U-steel; Overhanging bracket 6 is welded in U-steel 4 outsides that needs connected girder steel 14 1 sides, and described overhanging bracket 6 is comprised of top flange plate 7, bottom wing listrium 8 and web 9, in the relevant position punching that web 9 is connected with girder steel 14; At top flange plate 7 and bottom wing listrium 8 positions welding external reinforcing plate for car 11.Owing to can't internal partition be set in inside, therefore adopt this external reinforcing plate for car 11 to realize that the beam-ends moment of flexure is to the reliable delivery of node area.

3) with the former steel concrete post 1 of two U-steels, 4 make-up outsourcings, and continuous with butt weld 12, as shown in Figure 5, build node area concrete 13, as shown in Figure 6.

4) after node area concrete 13 reaches intensity, hoisting steel beam 14, and with the web 9 usefulness high-strength bolts 15 of overhanging bracket 6 with are connected the web of a junction plate 16 with girder steel 14 and are connected, whether the top flange plate 7 of overhanging bracket 6 and the upper and lower frange plate of bottom wing listrium 8 and girder steel 14 are welded, realize respectively rigidly connecting or being articulated and connected of girder steel 14 and former steel concrete post 1, as shown in Figure 6.

The invention provides the method for attachment of a kind of girder steel and existing reinforced concrete post, can be used for the strengthening reconstruction of existing reinforced concrete structure.The method has overcome the deficiency of traditional method of attachment, simple structure, and prefabrication and assembly construction, it is quick and convenient to construct, and concrete wet trade amount is little, and is little to surrounding environment influence.After adopting the method, the connected node stress performance is good, power transmission is reliable, steel plate external wrapping concrete, avoid the node area crack to expose, the joint cores shear-carrying capacity significantly improves, and is conducive to realize the aseismatic design concept of " the weak member of strong node ", encased steel plate has stronger effect of contraction to the core space concrete simultaneously, and the node anti-earthquake ductility is good.The method highly versatile has broad application prospects.

Claims (1)

1. the method for attachment of a girder steel and existing reinforced concrete post is characterized in that the method comprises the steps:

1) plants into the L-type bar dowel, at the peripheral assembling reinforcement net of L-type bar dowel sheet in former steel concrete post node link field scope inner surface dabbing, and at the dabbing place;

2) two U-steels of processing are at the inboard weld stud connector of U-steel; To connect the overhanging bracket of U-steel outside welding of girder steel one side, described overhanging bracket is comprised of top flange plate, bottom wing listrium and web; In the relevant position punching that web is connected with girder steel, top flange plate and the bottom wing listrium outside are welded with external reinforcing plate for car, and external reinforcing plate for car is with the U-steel outside welding that connects girder steel one side;

3) with the former steel concrete post of two U-steel make-ups outsourcing, and continuous with butt weld, the node area concreting;

4) after the node area concrete reaches intensity, hoisting steel beam, overhanging bracket web and steel beam web plate is affixed by high-strength bolt and junction plate, whether the upper and lower frange plate of the top flange plate of overhanging bracket and bottom wing listrium and girder steel welds, and realizes respectively rigidly connecting or being articulated and connected of girder steel and former steel concrete post.

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