A kind of foam concrete precast plate and with the method for its reinforced concrete structure
Technical field
The present invention relates to technical field of civil engineering, specifically is a kind of method that adopts prefabricated property sheet material that concrete structure is repaired and reinforced fast, and the foam concrete precast plate.
Background technology
The design life of general concrete structure is 50 years.When building structure reaches design life, structural performance significantly reduces, and still can continue normal the use after reinforcing, it is bigger to consider to remove reconstructed cost, can adopt the way of structural strengthening, structure is keeped in repair, reinforced, guarantee that its bearing capacity satisfies code requirement.
Structure does not reach service life, but owing to using the improper or build guality reason of maintenance, or under current relevant specification of country situation, identify through structure and can not satisfy that bearing capacity and durability Design require, or in new instructions for use, the part building will change purposes or add layer etc., need reinforce original structure.
At present, the reinforcement means of building structure has methods such as enlarging section, displacement concrete strengthening method, bonding outsourcing section steel reinforcement method, affixing steel plate reinforcement method, stickup fibre reinforced plastics reinforcing method.Enlarging section method and displacement coagulation local method all adopt concreting, though construction technology is simple, compliance is strong, the wet trade time of site operation is long, can not satisfy short requirement of cycle.The construction of bonding outsourcing section steel reinforcement method is simple and convenient, but the consumption steel material is big, and cost is higher, and should not be used for the high temperature place under the unshielded situation.The affixing steel plate reinforcement rule is applicable to the reinforcing that is subjected to curved or tensional element under the dead load, can not improve anti-seismic performance.
Therefore, be necessary to work out a kind of can reaching and both reduce wet trade in conjunction with the method for concrete strengthening method and steel reinforcing method advantage, shorten construction period, reduce the steel consumption amount again, improve the effect of building structure aseismatic aspect of performance.
Through the literature search to prior art, Chinese patent application number: 03227027.5, denomination of invention: a kind of expanded metal lath foam concrete light wall board, publication number: CN2599109, this patent is summarized as: a kind of expanded metal lath foam concrete light wall board, formed by the steel plate cylinder mould of making skeleton and foam concrete two parts of making packing material.Though this light wall board high-strength light combines reinforcing bar and concrete advantage, can be prefabricated, good endurance, easy construction, but can not be used for load-bearing, its purposes is subjected to bigger restriction, therefore is necessary to invent a kind of prefabricated panels that has more universality and application.
Summary of the invention
At defective of the prior art, the purpose of this invention is to provide a kind of foam concrete precast plate, and the method that adopts foam concrete precast plate reinforced concrete structure, can be in conjunction with the advantage of concrete strengthening and the reinforcing of steel bonding method, and have quick and portably that construction, construction operation are few, short construction period, consolidation effect be good, strenthening member can be prefabricated, realizes advantages such as production easily, can be used in the reinforcing of members such as post, beam, plate, bridge pier, body of wall, have engineering application widely.
According to an aspect of the present invention, provide a kind of method that adopts foam concrete precast plate reinforced concrete structure, comprise the steps:
The first step, according to reinforcing the foam concrete precast plate that requires to be designed for reinforcing, this precast plate is by the foam concrete layer, insulation layer and outward appearance layer are formed, described foam concrete layer is built by steel mesh reinforcement or gauze wire cloth or steel strand and foam concrete and is formed, be overlapped with stirrup on steel mesh reinforcement or gauze wire cloth or the steel strand, stirrup reserved steel bar joint connects between a plurality of contiguous prefabricated plates; Or described foam concrete layer forms by foam concrete is cast-in-place;
In second step, the structural element external surface that needs reinforcement is laid one deck elastic layer;
The 3rd step was wrapped on the elastic layer that second step laid the precast plate of first step design is tightly outer, and with the stirrup welding of contiguous prefabricated plate correspondence, formed complete back-up coat.
Preferably, described foam concrete layer when being used for the reinforcing of pressurized or flexural member, adopts steel mesh reinforcement, when being used for the tensional element reinforcing, adopts gauze wire cloth or steel strand.
Preferably, described insulation layer is made up of screed, adiabator layer.Screed is arranged between foam concrete layer and the adiabator layer.The light high performance of heat insulating material according to the architectural environment requirement, can adopt polyurethane foam or extruded sheet; Screed possesses certain adhesive property, and proportioning is selected for use according to requirement of strength, plays the effect of bonding foam concrete layer and adiabator layer.
Preferably, described outward appearance layer is made up of articulamentum, light weight board, and articulamentum is the transition zone at outward appearance layer and insulation layer interface, and light weight board can require to select for use according to reality, such as FPP foaming plate, GRC light weight board etc.Articulamentum can adopt the bonding interface agent that possesses certain intensity, as the ABS bonding agent.
Preferably, described precast plate is the skirt form with the contact surface of the structural element that needs reinforcement, and connects with bolt.To increase the shear resistance of precast plate.
Preferably, described precast plate junction adopts the stirrup that presets in the precast plate to connect, can the operative constraint precast plate, and improve the integral working of precast plate, and improve the compressive strength of former concrete component.
Preferably, described stirrup is encrypted setting in the end of the structural element that needs reinforcement.
Preferably, the stirrup lap-joint of described contiguous prefabricated plate is provided with reserving hole, and this hole can be made into semicircle or arc.
According to a further aspect in the invention, a kind of foam concrete precast plate is provided, this precast plate is by the foam concrete layer, insulation layer and outward appearance layer are formed, described foam concrete layer is built by steel mesh reinforcement or gauze wire cloth or steel strand and foam concrete and is formed, be overlapped with stirrup on steel mesh reinforcement or gauze wire cloth or the steel strand, stirrup reserved steel bar joint connects between a plurality of contiguous prefabricated plates.
Operating principle of the present invention:
One, based on the high-strength light characteristic of foam concrete.By being added with the foam concrete of steel mesh reinforcement (gauze wire cloth), form the reinforced concrete shear wall of high-strength light, the precast plate quality is more a lot of than the concrete light under the equal conditions, reinforces heavyly slightly than clean steel material, and intensity is constant substantially even increase; Insulation layer can effectively hinder and subtract the extraneous heat of coming in that transmits, and reduces indoor and outdoor exchange heat total amount, can realize insulation and fireproof function; The outward appearance layer can be selected according to appearance requirement and the actual needs of building structure, has good aesthetic.
Two, based on stressed distribution and the compatibility of deformation of prefabricated plate and original structure.Prefabricated panels tension, resistance to compression equal strength index can effectively be born the upper load of former member on the basis of the design strength that reaches reinforcing; Elastic layer between precast plate and the member that need to reinforce can be coordinated the distortion of former member and outsourcing precast plate foam concrete layer, guarantees that new-old concrete can collaborative work, raising member service behaviour, the application life of extending structure.
Compared with prior art, the present invention has following beneficial effect:
1. formulate size according to designing requirement, the sheet material shape can adapt to different requirements.2. can realize plant produced and prefabricated, be transported to the reinforcing scene and directly assemble, convenient and swift, shorten construction period.3. improve the new-old concrete bed boundary and be out of shape inharmonic performance.4. the prefabricated panels energy-absorbing effect is good, can improve the anti-seismic performance of structural element.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is that foam concrete precast plate material is formed schematic diagram.
Fig. 2 is foam concrete precast plate elevational schematic view.
Fig. 3~Fig. 5 is the method schematic diagram of reinforced column.
Each label is represented among the figure:
1. foam concrete precast plate, 1.1 foam concrete, 1.2 steel mesh reinforcements, 1.3 stirrups, 1.4 mortars, 1.5 insulation layers, 1.6 bonding interface agent, 1.7 thistle boards (PLASTIC LAMINATED), 2. reserving hole, 3. rubber layer, 4. bolt, 5. floor, 6. post, 7. stirrup welding point.
The specific embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit the present invention in any form.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Embodiment 1
Shown in Fig. 1-2, present embodiment provides a kind of method that adopts foam concrete precast plate reinforced concrete structure, wherein adopts foam concrete precast plate 1 to reinforce, and requires the strenthening member external surface to lay elastic layer earlier, again precast plate is wrapped in outward on the elastic layer, installs successively.
In the present embodiment, described foam concrete precast plate 1 is made up of foam concrete layer 1.1, insulation layer 1.5 and outward appearance layer, and the outward appearance layer is outermost layer, and insulation layer is between foam concrete layer and outward appearance layer, and the foam concrete layer is used for being connected with strenthening member.
In the present embodiment, described foam concrete layer can by steel mesh reinforcement or gauze wire cloth or steel strand and foam concrete is cast-in-place forms, or forms by foam concrete is cast-in-place.When reinforced column, bridge pier post and load bearing wall, adopt steel mesh reinforcement foam concrete; Adopt gauze wire cloth foam concrete when reinforcement, plate, it is evenly closely knit that foam concrete is built the pore of formation, the light and intensity height of quality, and foam stability is strong, good heat insulating.When replacing non-bearing wall body, directly adopt foam concrete.
In the present embodiment, also be provided with stirrup, reserving hole and sheet material skirt on the foam concrete precast plate.Described stirrup is overlapped on the vertical muscle of steel mesh reinforcement, and the stirrup of corresponding strenthening member end is encrypted setting, and the reserved steel bar joint connects between the precast plate; Described reserving hole is the stirrup lap-joint of contiguous prefabricated plate, can be made into semicircle or arc; The contact surface that described sheet material skirt is sheet material and strenthening member is made into the skirt form, and connects with bolt.
In the present embodiment, described insulation layer is made up of screed, adiabator layer: the light high performance of the heat insulating material of adiabator layer, according to the architectural environment requirement, can adopt polyurethane foam or extruded sheet; Screed must possess certain adhesive property, and proportioning is selected for use according to requirement of strength, is arranged between foam concrete layer and the adiabator layer, plays the effect of bonding foam coagulating layer and heat insulating material, thickness range 5-10mm.
In the present embodiment, described outward appearance layer is made up of articulamentum, light weight board 1.7, and light weight board is that quality is light, and field fabrication is convenient, satisfies the requirement of certain intensity, such as FPP foaming plate, GRC light weight board etc.; Articulamentum is the transition zone at outward appearance layer and insulation layer interface, adopts the bonding interface agent 1.6 that possesses certain intensity, as the ABS bonding agent.
Adopt above-mentioned foam concrete precast plate, the specific implementation step following (only enumerating the Scheme of Strengthening of post) during reinforced concrete structure member of the present invention:
The first step: according to the former design data of structure, the structure materials of identification and Scheme of Strengthening designing and calculating, foam concrete precast plate 1 is designed and calculates, be prefabricated into required shape.
Er Walk: the member that need are reinforced carries out removing surface, guarantees that the surface is clean and tidy, exists the position in crack must use bonding agent to repair.
San Walk: frivolous rubber layer 3 evenly is attached to component surface (3-5mm is thick, has favorable elasticity, and construction requirement must be smooth, can not leave bubble or purse up the position).
Si Walk: the foam concrete precast plate is installed.Must adopt jack with styletable jack-up up during reinforced column, precast plate is adjacent to rubber layer, with the stirrup electric welding, finish the amalgamation of precast plate, then jack slowly be removed, guarantee precast plate and the former component synergism work of outsourcing.
The 5th step: the precast plate shear resistance with bolt 4 anchorings, is improved in precast plate skirt place, fill the reserving hole 2 on the precast plate.
Embodiment 2
Present embodiment adopts embodiment 1 described foam concrete precast plate and implementation step reinforced column.
Shown in Fig. 3-5, for square pillar, by tightly outer four limits that wrap in post of four block-shaped the same square foam coagulate plates 1, stick frivolous rubber layer 3 between post and the gusset plate, type of attachment between the coagulate plate 1 adopts welding 7, stirrup 1.3 is being located to adopt Type of Welding, in time reserving hole 2 is being filled after welding finishes, packing material can adopt cement mortar or concrete.For circular columns, precast plate can be made into half-circle-arc shape, behind outsourcing and the post, precast plate is reserved the electric welding of stirrup joint.
Embodiment 3
Present embodiment adopts embodiment 1 described foam concrete precast plate and implementation step to substitute body of wall.
For load bearing wall, described foam concrete precast plate can directly be filled between the beam column, serves as body of wall, and sheet material can bear upper load, and satisfies insulation, fire protection requirement; For non, layer of concrete proposed by the invention then need not steel mesh reinforcement 1.2, directly serves as body of wall.
Embodiment 4
Present embodiment adopts embodiment 1 described foam concrete precast plate and implementation step to reinforce the bridge pier post.
For the single-column bridge pier, at bridge pier post both lateral sides outsourcing foam concrete precast plate, connected mode can increase the lateral stiffness of single-column with reference to shown in Fig. 3-5, improves the vibration frequency of post.For the Double Column Piers post, in the middle of post, the foam concrete precast plate is set, as the horizontal coupling beam of two posts, improve lateral stiffness and the anti-bending strength of bridge pier, the lateral displacement of restriction vehicle to run process Dun Ding.
The present invention is based on the characteristic of foam concrete high-strength light and precast plate and former component synergism distortion.The foam concrete layer mainly works to bear the original structure load, and the characteristic of its high-strength light determines to bear pressure, pulling force, moment of flexure and dynamic loading, and is good with former member coordination performance.Insulation layer can play the effect of resistance reduction of heat amount transmission, has fireproof performance, protection foam concrete layer and original structure member.The outward appearance layer can be selected for use according to the requirement attractive in appearance of building.When reinforced column, foam concrete precast plate layer of concrete adopts steel mesh reinforcement, and its mechanical strength feature class is similar to shear wall, and the compressive strength that can provide former member additionally to increase the required designing requirement of load can be born bigger external load; When reinforcement, foam concrete precast plate layer of concrete adopts gauze wire cloth, and gauze wire cloth can provide great tensile strength, and the quality of precast plate is less simultaneously, and is little to the deadweight influence of original structure.The precast plate that the present invention proposes can directly be used as infilled wall, and this moment, the foam concrete layer need not add reinforcing bar (silk) net.Method of the present invention combines the advantage of concrete and steel reinforcing, and can be prefabricated in the factory, and reduces the situ wet operation, accelerates the structural strengthening construction speed, and application promise in clinical practice is arranged in practice.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence flesh and blood of the present invention.