CN206220245U - A kind of beam-column joint of reinforced concrete frame ruggedized construction - Google Patents

Abstract

The utility model relates to a reinforcement structure for reinforced concrete frame beam-column joints, which comprises interconnected frame beams, frame columns and floor slabs; A plurality of vertical steel bars on each connecting node of the frame beam and the frame column, the several vertical steel bars pass through the floor slab and are connected as a whole through the horizontal stirrups, and the outside of the steel cage is wrapped with a concrete layer. The beam-column joint reinforcement structure of the reinforced concrete frame has a simple structure and good reinforcement effect.

Description

A Reinforced Concrete Frame Beam-Column Joint Reinforced Structure

technical field

The utility model relates to a reinforced concrete frame beam-column node reinforcement structure.

Background technique

After the building has been used for a long time, it is easy to have various safety hazards due to structural damage, material aging and human factors. With the continuous improvement of my country's economic and social development, people's requirements for building functions and safety are getting higher and higher. The functions of old buildings may not meet the new requirements, or they may not meet the new requirements because of the low requirements of early architectural design specifications. At the same time, the old buildings have been used for a long time and are prone to various damages, which will affect their safety. Generally speaking, when the above-mentioned problems occur in existing buildings, two methods can be adopted: demolition and reconstruction or repair and reinforcement. The cost of demolition and reconstruction is high, the construction period is long and the large amount of construction waste generated has a serious impact on the environment; while the relative cost of reinforcement treatment is much lower, the construction period is short, and construction waste is less, and the original building will not be damaged under the premise of meeting the new use requirements. Some structural forms have been widely used in recent years. Frame structure is the most widely used structural form in civil building structures. Its beam-column joints are the key components connecting frame beams and frame columns, and are important components for transmitting and distributing internal forces. They play a role in ensuring the integrity of frame structures. It often causes continuous collapse and damage of the entire frame structure, and the consequences are very serious. Therefore, it is very necessary to take certain reinforcement measures for frame beam-column joints with potential safety hazards.

The purpose of reinforcement of reinforced concrete frame joints is to improve the joint strength, stiffness, ductility and other performance indicators. Currently, reinforcement methods commonly used for reinforced concrete frame joints include enlarged section reinforcement method, bonded steel/outsourcing steel reinforcement method, bonded fiber cloth reinforcement method, anchor bonded steel reinforcement method, prestressed reinforcement method, composite reinforcement method, etc. However, these reinforcement methods have corresponding advantages and disadvantages. For example, when the reinforcement method with enlarged cross-section is adopted, the structural force is clear and the reinforcement performance is reliable. The headroom of the building is reduced to a certain extent; when using bonded steel reinforcement or outsourcing steel reinforcement, the strength and stiffness of the joints are greatly improved, but the durability of the epoxy resin-based adhesive used, The aging performance is difficult to guarantee, and the pasted steel may be detached after a long time; the reinforcement effect of the anchor-attached steel reinforcement method is better, but the damage to the original beam-column joint is relatively large. When the original joint reinforcement is relatively dense, the construction is more complicated. . The reinforcement process of sticking fiber cloth is simple and does not change the original size of the node. The fiber cloth has high tensile strength and corrosion resistance, but the geometric structure of the existing node may make the fiber cloth unable to be effectively pasted and end anchored. The performance of the fiber cloth cannot be brought into full play.

Utility model content

In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a reinforced concrete frame beam-column joint reinforcement structure, which is not only simple in structure, but also convenient and efficient.

In order to solve the above technical problems, the technical solution of the present utility model is: a reinforced concrete frame beam-column node reinforcement structure, including interconnected frame beams, frame columns, and floor slabs. There is a reinforcement cage, and the reinforcement cage includes a plurality of vertical reinforcements located at each connection node between the frame beam and the frame column, and the several vertical reinforcements pass through the floor slab and are connected as a whole by transverse stirrups. The outside of the cage is clad with a layer of concrete.

Preferably, the frame columns extend vertically, the frame beams are cross-shaped and connected to the frame columns, and the floor panels are located on the horizontal upper surface of the frame beams.

Preferably, the floor slab is provided with several through holes at the connection node between the frame beam and the frame column, the vertical steel bars pass through the through holes, and the lower ends of the vertical steel bars are all located below the floor slab, so The upper ends of the above-mentioned vertical steel bars are all located above the floor slab, the lower ends of several vertical steel bars are connected as a whole through the lower horizontal stirrups bound around the frame columns, and the upper ends of several vertical steel bars are connected through the upper horizontal stirrups bound around the frame columns The tendons are connected as one.

Preferably, two horizontal stirrups are bound around the frame columns at the upper ends of several vertical steel bars.

Preferably, the reinforcement cage further includes prestressed steel wire bundles, and the prestressed steel wire bundles are spirally wound from top to bottom on the outer peripheral parts of several vertical steel bars connected together, and bound and fixed with the vertical steel bars, the frame The beam is provided with several relief through holes for the helically wound prestressed steel wire bundles to pass through, and the two ends of the prestressed steel wire bundles are respectively fixed by anchors arranged on both sides of the frame beam.

Preferably, each of the anchors includes an anchor backing plate that is fixedly connected to the frame beam through an anchor bolt, and the anchor backing plate is provided with an anchor ring and a clip for anchoring the prestressed steel wire bundle, and the prestressed steel wire bundle Distributed within the beam height of the frame beams at the bottom of the floor slab.

Preferably, the prestressed steel wire bundle is a high-strength low-relaxation uncoated steel wire, which is coated with an anti-corrosion grease layer, and is sheathed with a high-density polyethylene sleeve for protection. The prestressed steel wire bundle is connected with several The contact ends of the vertical steel bars are fixed by binding.

Preferably, the concrete layer is micro-expanded fine stone concrete.

Compared with the prior art, the utility model has the following beneficial effects: the structure of the reinforced concrete frame beam-column joint reinforced structure is simple, old buildings do not need to be dismantled and rebuilt, the cost is low, and the reinforcement effect is good.

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Description of drawings

Fig. 1 is the top view of removing the floor panel in the embodiment of the utility model.

Fig. 2 is a sectional view along line A-A of Fig. 1 .

Fig. 3 is a first schematic diagram of the connection of the vertical steel bar and the horizontal stirrup in the embodiment of the utility model.

Fig. 4 is the second schematic diagram of the connection of the vertical steel bar and the horizontal stirrup in the embodiment of the utility model.

Fig. 5 is a structural schematic diagram of the concrete layer in the embodiment of the utility model.

Fig. 6 is a schematic diagram of the structure of the anchorage.

Figure 7 is a schematic diagram of the structure of the frame beam and frame column before reinforcement.

In the figure: 1-frame beam, 2-frame column, 3-floor panel, 4-vertical reinforcement, 5-concrete layer, 6-lower horizontal stirrup, 7-upper horizontal stirrup, 8-prestressed steel wire bundle, 9-anchor, 10-anchor plate, 11-anchor ring, 12-clip, 13-anchor bolt.

detailed description

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific examples are given together with the accompanying drawings and described in detail as follows.

As shown in Figures 1 to 7, a reinforced concrete frame beam-column joint reinforcement structure includes interconnected frame beams 1, frame columns 2, and floor slabs 3, and the connection nodes between the frame beams and frame columns are provided with reinforcement cages , the reinforcement cage includes several vertical reinforcement bars 4 positioned at each connecting node between the frame beam and the frame column, and several vertical reinforcement bars pass through the floor slab and are connected as a whole through horizontal stirrups, the reinforcement cage The exterior is wrapped with a concrete layer5.

In the embodiment of the present invention, the frame column extends vertically, the frame beam is cross-shaped and connected with the frame column, and the floor plate is located on the horizontal upper surface of the frame beam.

In the embodiment of the present utility model, the floor slab is provided with several through holes at the connection node between the frame beam and the frame column, and the vertical steel bars pass through the through holes, and the lower ends of the vertical steel bars are located at the Below the panel, the upper ends of the vertical steel bars are all located above the floor slab, the lower ends of several vertical steel bars are connected as a whole through the lower horizontal stirrups 6 bound around the frame columns, and the upper ends of several vertical steel bars are connected by surrounding frame columns. The upper transverse stirrups 7 connected by the columns are connected as a whole.

In the embodiment of the utility model, two horizontal stirrups are bound around the frame columns at the upper ends of several vertical steel bars.

In the embodiment of the utility model, the steel cage also includes prestressed steel wire bundles 8, and the prestressed steel wire bundles are spirally wound from top to bottom on the outer peripheral parts of several vertical steel bars connected as one, and are connected with the vertical steel bars. Binding and fixing, the frame beam is provided with a number of relief through holes for the helically wound prestressed steel wire bundle to pass through, and the two ends of the prestressed steel wire bundle pass through the anchors arranged on both sides of the frame beam 9 is fixed, considering the characteristics of the secondary stress of the reinforced structure, the prestress provided by the prestressed steel wire is used to offset part of the internal force of the original node, and the core area of the frame beam-column joint is largely utilized by the prestressed steel wire The restraining effect of the beam-column joint greatly improves the shear capacity and stiffness of the beam-column joint, thereby improving the energy dissipation performance of the beam-column joint. The reinforcement cage is made by binding, which is convenient for on-site construction, and the frame beam, frame column and floor slab are more firmly connected. , the force transmission is more reliable, so that the old and new structures can work together.

In the embodiment of the present utility model, the anchors all include anchor pads 10 fixedly connected to the frame beams via anchor bolts 13, and the anchor pads are provided with anchor rings 11 and clips for anchoring prestressed steel wire bundles. sheet 12, the prestressed steel wire bundles are distributed within the beam height range of the frame beam at the bottom of the floor slab.

In the embodiment of the utility model, the prestressed steel wire bundle is a high-strength low-relaxation uncoated steel wire, which is coated with an anti-corrosion grease layer and is protected by a high-density polyethylene sleeve. The contact ends of the steel wire bundle and several vertical steel bars are fixed by binding.

A construction method for a reinforced concrete frame beam-column joint reinforced structure is carried out according to the following steps:

(1) On the floor slab at the connection node between the frame beam and the frame column, open a through hole for the vertical reinforcement to pass through, and at the same time open a relief through hole for the prestressed steel wire bundle to pass through on the side of the frame beam;

(2) The vertical reinforcement passes through the through hole on the floor slab and is arranged around the vertical outer surface of the frame column, also outside the frame beam section, the upper and lower ends of the vertical reinforcement are bound and fixed with horizontal stirrups;

(3) Within the height range of the frame beam at the connection node between the frame beam and the frame column, use prestressed steel wire bundles to spirally surround the vertical steel bars, and use binding connections to fix them. Give way to the through hole and fix it with anchors arranged on both sides of the frame beam. The anchors are fixed by anchor bolts. Prestressed steel wire bundles, vertical steel bars, and transverse stirrups form a reinforcement cage for reinforcement;

(4) Set up formwork under and on the side of the reinforcement cage, and spray micro-expanded fine stone concrete in the formwork to form a reinforced concrete layer. The thickness of the concrete layer is 2cm greater than the outermost steel bar of the reinforcement cage. formwork removal;

(5) The post-tensioning method is used to apply prestress to the prestressed steel wire bundle to the predetermined design value.

In the embodiment of the present utility model, in step (1), after the opening of the relief through hole on the frame beam is completed, the decorative layer and the concrete protection layer on the outer surface of the frame column within the connection node range between the frame beam and the frame column are removed. layer, the four corners are polished into rounded corners, and finally chiseled, cleaned and brushed with interface agent.

In the embodiment of the utility model, the utility model is applicable to the reinforcement of circular, rectangular, and special-shaped reinforced concrete frame column joint areas, which can be flexibly arranged, easily meets the reinforcement requirements, and has good engineering practical value.

The working principle of the reinforced concrete frame beam-column joint reinforcement structure: set vertical steel bars, transverse stirrups, and prestressed steel wire bundles outside the frame beam-column joints, and spray the fine stone concrete layer on the reinforcement area to increase the joint range, and then prestress the joints. Stressed steel wire bundles apply prestress to improve the clamping force. On the one hand, the secondary force characteristics of the reinforced structure are considered. The prestress provided by the prestressed steel wire bundle can offset part of the internal force of the original joint, and at the same time, it has a certain restraint effect on the concrete in the core area of the frame beam-column joint, which improves the frame beam-column joint. The shear bearing capacity and stiffness of the joints are improved, thereby improving the energy dissipation performance of the frame beam-column joints. On the other hand, the frame columns, frame beams and floor panels are connected more firmly, and the force transmission between the three is more effective.

The utility model is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of reinforcement structures of reinforced concrete frame beam-column joints under the enlightenment of the utility model. All equivalent changes and modifications made according to the patent scope of the utility model should belong to the scope of the utility model.

Claims (8)

1. a reinforced concrete frame beam-column joint reinforcement structure, is characterized in that: comprise interconnected frame beam, frame column, floor panel, described frame beam and the connecting node of frame column are provided with reinforcing cage, described reinforcing cage It includes a plurality of vertical steel bars on each connection node between the frame beam and the frame column, and the several vertical steel bars pass through the floor slab and are connected as a whole through horizontal stirrups. The outside of the reinforcement cage is wrapped with a concrete layer. 2. The reinforced concrete frame beam-column joint reinforcement structure according to claim 1, characterized in that: the frame columns extend vertically, the frame beams are cross-shaped and connected to the frame columns, and the floor panels are located on the frame beams level upper surface. 3. The reinforced concrete frame beam-column joint reinforcement structure according to claim 1, characterized in that: the floor slab is provided with several through holes at the connection nodes of the frame beam and the frame column, and the vertical steel bars pass through Through the through holes, the lower ends of the vertical steel bars are all located below the floor slab, the upper ends of the vertical steel bars are all located above the floor slab, and the lower ends of several vertical steel bars are connected by lower horizontal stirrups bound around the frame columns. As a whole, the upper ends of several vertical steel bars are connected as a whole through the upper horizontal stirrups bound around the frame columns. 4. The reinforced concrete frame beam-column joint reinforcement structure according to claim 3, characterized in that: the upper ends of several vertical steel bars are tied with two transverse stirrups around the frame columns. 5. The reinforcement structure of reinforced concrete frame beam-column joints according to claim 1, characterized in that: the reinforcement cage also includes prestressed steel wire bundles, and the prestressed steel wire bundles are spirally wound from top to bottom in several connected ones The outer periphery of the root vertical steel bar is bound and fixed with the vertical steel bar. The frame beam is provided with a number of relief holes for the helically wound prestressed steel wire bundles to pass through. The two prestressed steel wire bundles The ends are respectively fixed by anchors arranged on both sides of the frame beam. 6. The reinforced concrete frame beam-column joint reinforcement structure according to claim 5, characterized in that: said anchors all include anchor backing plates fixedly connected to frame beams via anchor bolts, said anchor backing plates are provided with The anchor ring and the clip are used for anchoring the prestressed steel wire bundles, and the prestressed steel wire bundles are distributed within the beam height range of the frame beam at the bottom of the floor slab. 7. The reinforced concrete frame beam-column joint reinforcement structure according to claim 5, characterized in that: the prestressed steel wire bundle is a high-strength low-relaxation uncoated steel wire, and its exterior is coated with an anti-corrosion grease layer, and is sleeved A high-density polyethylene casing is used for protection, and the contact ends of the prestressed steel wire bundle and several vertical steel bars are fixed by binding. 8. The reinforced concrete frame beam-column joint reinforcement structure according to claim 1, characterized in that: the concrete layer is micro-expansion fine stone concrete.