CN112144910A - Reinforced concrete frame joint HDC wire winding reinforcing device and construction method thereof - Google Patents
Reinforced concrete frame joint HDC wire winding reinforcing device and construction method thereof Download PDFInfo
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- 238000005507 spraying Methods 0.000 claims description 7
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- 238000002156 mixing Methods 0.000 claims description 6
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
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Abstract
The invention relates to a reinforced concrete frame joint HDC wire winding reinforcing device and a construction method thereof, wherein the device comprises a vertical frame column and a frame beam horizontally extending on the peripheral side of the vertical frame column, a reinforcing area of the reinforcing device comprises a full-height replacement area and a partial replacement area which are communicated, the full-height replacement area is formed by chiseling and penetrating the contact end of the frame beam and the frame column, the partial replacement area is formed by chiseling the peripheral surface of the frame column inwards to a core area of the internal node of the frame column, the connecting line of the middle points of each limb of a stirrup exposed in the core area of the node is fixedly connected with vertical steel bars, the steel bars are wound and connected into a whole by cold drawing steel wires, and the full-height replacement area and the partial replacement area are both subjected to HDC spray; through setting up the multistage replacement region, the weakening beam-ends consolidates, has increased the plasticity hinge figure of beam-ends under the earthquake action, has improved the redundancy of node destruction, adopts cold drawing steel wire and for the wire winding reinforcing bar can retrain the concrete of core area more efficiently, improves the hoop effect of core area, increases the constraint effect to the concrete.
Description
Technical Field
The invention relates to a reinforced concrete frame joint HDC wire winding reinforcing device and a construction method thereof.
Background
In the reinforced concrete frame structure, the joint of a frame column and a frame beam is a vital part in the whole structure, and mainly comprises a frame column and a beam intersected joint core area, and a column end and a beam end which are connected with the joint core area, wherein the joint core area plays a role in transferring load and distributing internal force in the whole frame structure. The node design is a key defense line for seismic fortification, and according to the regulations of building seismic design Specification (GB 50011-2010), the node which is reasonably designed has a normal damage form that a beam end plastic hinge area firstly generates a fine vertical crack under the action of strong shock. Along with the continuous input of seismic energy, the concrete of the compression area of the beam is crushed, meanwhile, an oblique cross crack begins to appear in the core area of the node and penetrates through the whole node, and finally, the core area of the node is subjected to shear failure and the concrete crushing or shear deformation is accompanied with the column end. In view of this, in order to reinforce the node after the node is damaged by earthquake, the cracked and un-peeled concrete needs to be removed, and then the beam end, the column end, and the core area of the node are reinforced.
The method for reinforcing the frame structure node generally comprises a method for reinforcing an enlarged node area, a method for reinforcing a hoop, a method for reinforcing replacement concrete, a method for wrapping angle steel, and the like. Because the stress of the node area is complex, a single reinforcing method cannot meet the reinforcing requirement. Most of the existing combined reinforcement methods are established on the basis of replacing concrete, and the stress performance of a node area is met by processing locally damaged concrete and combining measures such as additionally arranging dowel bars, steel hoops and angle steel.
The existing replacement concrete reinforcing method can improve the local defects of stressed members, basically does not change the section shape of the original structure after reinforcement, can effectively reduce the influence of reinforcing operation on building space, is particularly suitable for the conditions that the concrete in the stressed area of the original member is seriously damaged, the strength is too low, and the original member is corroded by physical and chemical engineering, is in fire and the like, and has better reinforcing effect. In order to solve the problem that the bonding force between the newly replaced concrete and the original structure is poor, the existing replacement reinforcement begins to replace the original common concrete by adopting fiber cement-based composite materials or high-ductility concrete (HDC) and the like, and the high-performance concrete has the characteristics of good bonding performance with the original structure, higher extreme pressure-limiting strain and compression toughness, high strength, high damage resistance and the like, and can effectively improve the bearing capacity and the seismic performance of the node.
Prior art techniques tend to reinforce the core region of the node prior to replacement concrete reinforcement. For example, fiber cloth is pasted in the node core area, or angle steel is arranged at the corner of the node concrete, or prestressed steel tows are adopted to wrap the node core area. However, the combined reinforcement method has various defects, such as more edges and corners after the concrete in the node area is broken, easy splitting of the adhered fiber cloth, and inconvenience in coating the primer and the structural adhesive; the self weight and the rigidity of the node can be increased by the profile steel structure, so that the node is unfavorable for earthquake resistance; the conventional prestressed steel strand reinforcement can only generate constraint near the corners of the member and in the node core area, which is consistent with the stress mechanism of a fiber cloth or a stirrup wrapping a frame column, the stirrup can be bent outwards under the action of the prestressed steel strand, and the section of the concrete near the side edge is not constrained.
In addition, most of the existing high-performance concrete reinforcement is replaced beam end concrete, a node core area and a column end are not reinforced, the seismic target of ' strong and weak columns and ' strong and weak members ' cannot be perfectly realized, the damage form of a reinforced structure is possibly changed disadvantageously, and the damage area under the action of an earthquake cannot be accurately predicted.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to solve the technical problem of providing the reinforced concrete frame joint HDC wire winding reinforcing device and the construction method thereof, which have simple and reasonable structure and convenient and quick construction.
In order to solve the technical problems, the technical scheme of the invention is as follows: reinforced concrete frame node HDC wire winding reinforcing apparatus, including the frame roof beam of vertical frame post and the horizontal extension of week side thereof, reinforcing apparatus's reinforcement district is including communicating full-height replacement district and partial replacement district, and full-height replacement district establishes for frame roof beam self and frame post contact end chisel and runs through the formation, and partial replacement district establishes to frame post inside node core region formation for boring inwards from frame post peripheral surface, each limb mid point connecting line department of node core region exposed stirrup has all linked firmly vertical reinforcing bar to connect each reinforcing bar wiring as an organic whole through the cold drawn steel wire, full-height replacement district and partial replacement district are all spouted to smear through HDC and are filled the reinforcement.
Further, the cold drawn steel wire is wound along node core area axis direction slant to in the tip welding on the stirrup, node core area extends its axis direction and is provided with a plurality of stirrups, the reinforcing bar is all through intermittent type spot welding and stirrup welding.
Further, the reinforcing bar all pastes and establishes each surface in node core area week side, and the cold drawn steel wire wraparound is in reinforcing bar and node core area periphery promptly, wedge the steel wedge between cold drawn steel wire and the node core area surface.
Furthermore, the HDC mainly comprises polyvinyl alcohol fibers, portland cement, water, quartz sand, a polycarboxylic acid high-efficiency water reducing agent and fly ash, and the replacement interface performance can be improved by doping nano silicon dioxide.
Furthermore, the HDC in the full-height displacement area is different from that in the partial displacement area, the HDC with the fiber volume mixing amount of 1.5% is in the full-height displacement area, and the HDC with the fiber volume mixing amount of 1.0% is in the partial displacement area.
Furthermore, the upper end face and the lower end face of the frame beam in the nearly full-height displacement area are both concavely provided with reinforcing grooves, and HDC with the fiber volume doping amount of 1.0% is sprayed and filled in the reinforcing grooves.
The working method of the HDC wire winding reinforcing device for the reinforced concrete frame node is carried out according to the following steps: s1, effectively supporting each component of the frame, removing the damaged concrete at the outer end along the whole width, removing the replacement depth not less than 50mm, the full-height replacement length which is the range of large occurrence of damage cracks, the length of the reinforcing groove which is the length of the full-height replacement length and extending more than 100mm, performing interface treatment on the original section, roughening the original section by using high-pressure water jet to form uniform lines in the direction vertical to the axis, S2, removing the decoration layer around the node core area and removing the concrete protection layer, wherein the upper end and the lower end of the core area need to be removed to at least expose a stirrup respectively, S3, performing spray-coating reinforcement on the partial replacement area by using HDC, performing wire winding reinforcement on the node core area in the curing process, fixing the wire winding on the middle of the side edge of the column by using a reinforcing steel bar in the direction parallel to the axis direction before wire winding, binding the two ends of the reinforcing steel bar onto the exposed stirrup, and firmly welding the steel bar on the stirrup of the frame column, continuously applying force and winding along the side surface of the node core area by inclining a certain angle, and spot-welding the tail end of the steel wire to the stirrup at the lower end of the node core area; and S4, spraying and smearing the HDC to the node core area for reinforcement, building a template in the full-height replacement area, injecting the HDC into the template to complete replacement of the beam end concrete, and removing the template to complete reinforcement after maintenance is finished.
Further, a wedge of steel is wedged between the steel wire and the surface of the core region of the node in step S3.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the invention, the full-height replacement concrete and the partial-height replacement concrete are adopted at the beam end, so that the frame beam generates a plurality of plastic hinges under the action of an earthquake, namely the plastic hinges are formed at a common concrete section and different HDC replacement reinforcement sections, the earthquake energy is dissipated through the rotation of the plastic hinges, the redundancy of the member under the action of the earthquake is increased, and the node core area is better protected.
2) The invention adopts HDC to replace and reinforce, which avoids the procedure of brushing structural interface glue on the concrete bonding surface of the original member, and improves the bonding force between the new and old interfaces of the concrete by using silicon dioxide, fly ash and the like contained in the HDC. The HDC is coated on a node core area, the high strength, the high ductility and the high damage resistance of the HDC are utilized to ensure that the stress performance of the node is improved under the condition that the cross section is not increased as much as possible, meanwhile, the internal cold-drawn steel wire is better sealed, and the service life of the steel wire is prolonged.
3) The hooping in the core area is prevented from outward protruding and deforming by arranging the steel wedge, the cold-drawn steel wire and the steel bar, so that the core concrete is restrained better, and the bearing capacity of the core area is greatly improved. The obliquely wound steel wires and the HDC are stressed cooperatively, so that the occurrence of shearing oblique cracks in the core area of the node is limited, and the shearing deformation of the node is reduced to the maximum extent.
4) The reinforcing device can not greatly increase the shape, size and dead weight of the node, is very beneficial to earthquake resistance, is simple and easy to construct, and is suitable for quickly repairing damaged components. Also be applicable to the optimization and join in marriage the node that the hoop is too close, improve node core area's shear capacity through coiling the steel wire and setting up the reinforcing bar for the wire winding, can replace most stirrup, the construction operation of being convenient for.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention;
FIG. 2 is a vertical cross-sectional view of an embodiment of the present invention;
FIG. 3 is a transverse cross-sectional view of an embodiment of the present invention;
FIG. 4 is a schematic view of a reinforced structure according to an embodiment of the present invention;
fig. 5 is a disassembled view of the frame column and the frame beam removed according to the embodiment of the present invention.
In the figure: 1-frame column, 2-frame beam, 3-full-height replacement area, 4-partial replacement area, 5-reinforcing groove, 6-stirrup, 7-reinforcing steel bar, 8-cold-drawn steel wire and 9-floor slab.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-5, the reinforced concrete frame joint HDC wire winding reinforcing device comprises a vertical frame column 1 and a horizontally extending frame beam 2 on the periphery of the vertical frame column, wherein a reinforcing area of the reinforcing device comprises a full-height displacement area 3 and a partial displacement area 4 which are communicated, the full-height displacement area is formed by drilling the contact end of the frame beam and the contact end of the frame column, the partial displacement area is formed by drilling the outer peripheral surface of the frame column inwards to a core area of the internal joint of the frame column, vertical steel bars 7 are fixedly connected to the connecting line of the middle points of each limb of a stirrup 6 exposed in the core area of the joint, the steel bars are wound and connected into a whole through a cold-drawn steel wire 8, and the full-height displacement area and the partial displacement area are reinforced through HDC spraying, filling and filling.
In the embodiment of the invention, the cold-drawn steel wire is obliquely wound along the axial direction of the node core area and is welded on the stirrups at the end part, the node core area is provided with a plurality of stirrups along the axial direction of the node core area, and the reinforcements are all welded with the stirrups through intermittent spot welding.
In the embodiment of the invention, the steel bars are attached to all the surfaces of the peripheral side of the node core area, namely, the cold-drawn steel wires are wound on the periphery of the steel bars and the node core area, and a steel wedge is wedged between the cold-drawn steel wires and the outer surface of the node core area.
In the embodiment of the invention, the HDC mainly comprises polyvinyl alcohol fibers, portland cement, water, quartz sand, a polycarboxylic acid high-efficiency water reducing agent and fly ash, and the performance of a replacement interface can be improved by doping nano silicon dioxide.
In the embodiment of the invention, the HDC in the full-height displacement area is different from that in the partial displacement area, the HDC with the fiber volume mixing amount of 1.5% is in the full-height displacement area, and the HDC with the fiber volume mixing amount of 1.0% is in the partial displacement area, so that the strength grade of the HDC is at least one grade higher than that of the concrete of the original component.
In the embodiment of the invention, the frame columns vertically penetrate through the floor slab 9 and are fixed, and the frame beams are positioned at the lower end of the floor slab and are fixedly connected with the floor slab.
In the embodiment of the invention, the upper end face and the lower end face of the frame beam close to the full-height displacement area are both concavely provided with the reinforcing grooves 5, HDC with the fiber volume doping amount of 1.0% is sprayed and filled in the reinforcing grooves, and the reinforcing grooves also belong to partial displacement areas.
The construction method provided by the embodiment of the invention is carried out according to the following steps:
1) and judging the strength grade of the concrete and the damage condition of the reinforced concrete frame joint according to the field identification result, and obtaining the possible area and length range of the plastic hinge of the frame beam through theoretical analysis, or taking the frame beam stirrup encryption section as the possible area of the plastic hinge. And (3) removing the load near the node and adopting effective support, removing the damaged concrete at the outer end along the whole width, wherein the replacement depth is not less than 50mm, the full-height replacement length is the range of large amplitude of damage cracks, and the length of the reinforcing groove is the length of extending the full-height replacement length by more than 100 mm. Wherein the partial replacement regions can be removed symmetrically along the partial width, but not only one corner of the cross section. The original section is subjected to interface treatment, high-pressure water jet can be used for roughening the original section into uniform lines in the direction vertical to the axis, and residual moisture can promote unhydrated cement and fly ash in HDC to generate further hydration reaction to fill interface gaps, so that the interface performance of a new structure and an old structure is enhanced.
2) Clear away the fitment layer all around of node core space and clear away the concrete protective layer, wherein the end need clear away to respectively exposing a stirrup about the core space at least, makes things convenient for cold drawn steel wire spot welding to the stirrup. And (3) grinding each edge of the core area of the node into a round angle, and then roughening and cleaning the cross section.
3) The HDC is used for spraying and smearing reinforcement on a part of the replacement area, and the winding reinforcement of the node core area can be performed firstly in the curing process. Before the wire winding, the wire winding steel bar is fixed to the middle of the side edge of the column in parallel to the axial direction of the column, two ends of the steel bar can be bound to the exposed stirrups, and the steel wire is firmly welded on the stirrups of the frame column by an intermittent spot welding method. And then continuously applying force for winding along the side surface of the node core area by inclining a certain angle (generally inclining by 30 degrees), and spot-welding the tail end of the steel wire to the stirrup at the lower end of the core area. In order to ensure that the steel wire better restrains the core area, a steel wedge can be driven between the steel wire and the surface of the node core area, so that the steel wire is tighter.
4) And (4) spraying, smearing and reinforcing the full-height displacement area by using HDC. And (4) building a template in the full-height replacement area, and then injecting HDC into the template to finish the replacement of the beam end concrete. If the bearing capacity of the upper column of the node is found to be insufficient through design checking calculation, the plastic hinge area of the upper column is replaced and reinforced, and the frame column is prevented from being damaged before the frame beam. And after the maintenance is finished, the template can be detached to finish the reinforcing operation.
In the embodiment of the invention, the high toughness and high strength of the HDC are utilized to improve the bearing capacity and ductility of the frame beam, and the bonding property between the HDC and the old concrete is improved by doping the nano silicon dioxide and the fly ash. The cold-drawn steel wire and the steel bar for wire winding realize the restraint with higher efficiency in the core area of the node, enhance the hoop effect in the core area and indirectly improve the bearing capacity of the concrete in the core area. And a new replacement mode is adopted, so that the replacement area and the replacement material are stressed in a step shape, and the node anti-seismic defense line is increased. The multi-section plastic hinges on the frame beams are used for consuming the damage energy, and the stress performance of the reinforced frame joints is greatly improved.
In the description of this patent, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the patent, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
The invention is not limited to the best embodiment, and other various forms of HDC wire-wound reinforcing devices for reinforced concrete frame joints and construction methods thereof can be obtained by anyone based on the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (8)
1. Reinforced concrete frame node HDC wire winding reinforcing apparatus, its characterized in that: including vertical frame post and the frame roof beam of the horizontal extension of week side thereof, reinforcing apparatus's reinforcement district is including communicating full-height replacement district and partial replacement district, and the full-height replacement district establishes for frame beam self and frame post contact end chisel and runs through the formation, and partial replacement district establishes to frame post inside node core district formation for boring inwards from frame post peripheral surface, each limb mid point connecting line department of node core district exposed stirrup has all linked firmly vertical reinforcing bar to be a whole with each reinforcing bar wire-wound connection through the cold drawn steel wire, full-height replacement district and partial replacement district all spout to smear the packing and consolidate through HDC.
2. A reinforced concrete frame node HDC wire-wound reinforcement device according to claim 1, wherein: cold drawn steel wire is along node core area axis direction slant winding to on the stirrup in the tip welding, it is provided with a plurality of stirrups to extend its axis direction in the node core area, the reinforcing bar is all through intermittent type spot welding and stirrup welding.
3. A reinforced concrete frame node HDC wire-wound reinforcement device according to claim 2, wherein: the reinforcing bar for the wire winding is all pasted and is established each surface of node core area week side, and the cold drawn steel wire wraparound is in reinforcing bar and node core area periphery promptly, wedge the steel wedge between cold drawn steel wire and the node core area surface.
4. A reinforced concrete frame node HDC wire-wound reinforcement device according to claim 1, wherein: the HDC mainly comprises polyvinyl alcohol fibers, Portland cement, water, quartz sand, a polycarboxylic acid high-efficiency water reducing agent and fly ash.
5. A reinforced concrete frame node HDC wire-wound reinforcing apparatus according to claim 4, wherein: the full-height displacement area is different from HDC in the partial displacement area, the HDC with the fiber volume mixing amount of 1.5% is in the full-height displacement area, and the HDC with the fiber volume mixing amount of 1.0% is in the partial displacement area.
6. The reinforced concrete frame joint HDC wire winding reinforcing device according to claim 4 or 5, characterized in that: the upper end face and the lower end face of the frame beam in the nearly full-height displacement area are both concavely provided with reinforcing grooves, and HDC with the fiber volume doping amount of 1.0% is sprayed and filled in the reinforcing grooves.
7. The construction method of the HDC wire-wound reinforcing device for the reinforced concrete frame joints is characterized in that the HDC wire-wound reinforcing device for the reinforced concrete frame joints as claimed in claims 1-6 is adopted and is carried out according to the following steps: s1, effectively supporting each component of the frame, removing the damaged concrete at the outer end along the whole width, replacing depth not less than 50mm, replacing length at full height as a range of large occurrence of damage cracks, extending reinforcing groove length as a length of more than 100mm, performing interface treatment on the original section, roughening the original section by using high-pressure water jet to form uniform lines in the direction vertical to the axis, S2, removing decoration layers around the node and removing a concrete protection layer, wherein the upper end and the lower end of the core area need to be removed to at least expose a stirrup respectively, S3, performing spray-coating reinforcement on a part replacement area by using HDC, performing wire winding reinforcement on the core area of the node in the curing process, fixing the wire winding to the middle of the side of the column by using reinforcing steel bars in the direction parallel to the axis of the column before wire winding, binding the two ends of the reinforcing steel bars to the middle point of each limb of the exposed stirrup, and firmly welding the steel bars on the stirrup of the column of the frame by adopting an intermittent spot welding method, continuously applying force and winding along the side surface of the node core area by inclining a certain angle, and spot-welding the tail end of the steel wire to the stirrup at the lower end of the node core area; and S4, spraying and smearing the HDC to the full-height replacement area for reinforcement, building a template in the full-height replacement area, injecting the HDC into the template to complete replacement of the beam end concrete, and removing the template to complete reinforcement after maintenance is finished.
8. A method of operating a reinforced concrete frame node HDC wire-wound reinforcement arrangement according to claim 7, characterised in that: a steel wedge is wedged between the steel wire and the surface of the node core area in step S3.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113789975A (en) * | 2021-10-21 | 2021-12-14 | 苏州达康建筑科技有限公司 | Structure and method for reinforcing core area of concrete frame |
| CN113818714A (en) * | 2021-09-18 | 2021-12-21 | 广东睿固建设科技有限公司 | Local replacement reinforcing method applied to concrete column |
| CN115198883A (en) * | 2022-08-08 | 2022-10-18 | 上海市建筑科学研究院有限公司 | SMA-ECC composite reinforced RC frame structure and construction method thereof |
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