CN114737784B - Tensioning and reinforcing member for reinforcing ECC (error correction code) pretightening force by high-strength stainless steel stranded wire net and construction method thereof - Google Patents
Tensioning and reinforcing member for reinforcing ECC (error correction code) pretightening force by high-strength stainless steel stranded wire net and construction method thereof Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 196
- 239000010935 stainless steel Substances 0.000 title claims abstract description 196
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 41
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000012937 correction Methods 0.000 title description 2
- 239000004567 concrete Substances 0.000 claims abstract description 50
- 230000002787 reinforcement Effects 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000004873 anchoring Methods 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 9
- 239000010963 304 stainless steel Substances 0.000 claims description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 8
- 239000012779 reinforcing material Substances 0.000 abstract description 2
- 239000011150 reinforced concrete Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Classifications
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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
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/04—Mats
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention relates to the technical field of civil engineering, in particular to a high-strength stainless steel stranded wire net reinforced ECC pretightening force tensioning reinforcing member and a construction method thereof, wherein the reinforcing member comprises an original concrete member and an ECC reinforcing layer which is arranged outside the original concrete member and contains a high-strength stainless steel stranded wire net, and the high-strength stainless steel stranded wire net is formed by a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires which are fixed in a crossing way; the reinforcement member further comprises a distance control device, a pretightening force control device and anchoring devices positioned at two ends of the original concrete member. The invention has simple construction and easy operation, can lead the steel strand to be stressed in advance by applying the pretightening force, effectively inhibit the development of cracks, improve the rigidity after reinforcement and the like, effectively avoid the situation that the mechanical property of the steel strand cannot be fully exerted due to the looseness of the high-strength stainless steel strand during reinforcement, accurately control the distance between the steel strand and the original component, ensure the reinforcing material to fully exert the mechanical property of the steel strand, and achieve the ideal reinforcing effect.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a tensioning and reinforcing member for reinforcing ECC pretightening force by a high-strength stainless steel stranded wire net and a construction method thereof, which are used for reinforcing concrete structures such as columns, beams and the like.
Background
Along with the rapid development of the economy in China, the construction industry in China has jumped into the development period which takes modernization transformation and maintenance reinforcement as important points, and the existing reinforcement technology mainly comprises the following steps: steel wire rope reinforcement, prestress steel twisted wire net-polymer mortar reinforcement, FRP reinforced ECC reinforcement and the like. However, the prior art has more or less certain disadvantages, such as the fact that the steel wire rope is loose during reinforcement because of no prestress applied in the steel wire rope reinforcement, and the mechanical properties of the reinforced column cannot be fully exerted because of the relaxation of the steel wire rope, and the tensile strength of the polymer mortar is lower in the prestress steel twisted wire mesh-polymer mortar reinforcement, so that the reinforcement column is not directly stressed, and the mechanical properties of the reinforced column are not improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the tension reinforcing member with the high-strength stainless steel stranded wire net for enhancing the ECC pretightening force and the construction method thereof, which are simple and convenient to construct and easy to operate, the steel stranded wire can be stressed in advance through the pretightening force, the development of cracks can be effectively restrained, the rigidity after reinforcement and the like can be improved, the problem that the mechanical property of the reinforced steel stranded wire cannot be fully exerted due to the relaxation of the high-strength stainless steel stranded wire during reinforcement can be effectively avoided, the distance between the steel stranded wire and the original member can be accurately controlled, the mechanical property of the reinforcing material can be fully exerted, and the ideal reinforcing effect can be achieved.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the method comprises the steps of designing a high-strength stainless steel stranded wire net reinforced ECC pretightening force tensioning reinforcing member, wherein the tensioning reinforcing member comprises an original concrete member and an ECC reinforcing layer which is arranged outside the original concrete member and contains a high-strength stainless steel stranded wire net, and the high-strength stainless steel stranded wire net is formed by a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires which are fixed in a crossing manner; the reinforcement member further comprises a distance control device, a pretightening force control device and anchoring devices positioned at two ends of the original concrete member;
the distance control device is fixed around the original concrete member and used for controlling the distance between the high-strength stainless steel stranded wire net and the original concrete member, so that the high-strength stainless steel stranded wire net is positioned in the middle of the ECC reinforcing layer;
the pretightening force control device applies pretightening force to the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire;
one end of the longitudinal high-strength stainless steel stranded wire is connected with the pretightening force control device, and the other end of the longitudinal high-strength stainless steel stranded wire is fixed at the end part of the original concrete member through the anchoring device.
Further, the pretightening force control device comprises a positive and negative nut and a corresponding positive and negative split bolt, the other end of the positive and negative split bolt is annular, and the aluminum buckle is used for connecting the high-strength stainless steel stranded wire.
Further, the anchoring device is a bar planting anchoring structure, and the bar planting anchoring structure comprises bar planting holes arranged at two ends of the original concrete member.
Further, the bar planting hole is inclined to one side of the original concrete member by 10-30 degrees, the projection length of the bar planting hole in the direction parallel to the side surface of the original concrete member is greater than or equal to 40d, and the diameter of the bar planting hole is greater than or equal to 3.5d, wherein d is the diameter of the high-strength stainless steel stranded wire; the diameter d of the high-strength stainless steel stranded wire is more than or equal to 1.2mm and less than or equal to 6mm.
Further, the transverse high-strength stainless steel stranded wires are arranged on the outer sides of the longitudinal high-strength stainless steel stranded wires; and the stretching connection parts of the longitudinal high-strength stainless steel stranded wires are staggered up and down, and the stretching connection parts of the transverse high-strength stainless steel stranded wires are staggered front and back and left and right.
Further, the distance between the transverse high-strength stainless steel stranded wires and the original concrete member is greater than or equal to 10mm and is smaller than or equal to 1/2 of the thickness of the ECC reinforcement layer.
Further, the length of the positive and negative split bolt is more than or equal to 12d, wherein d is the diameter of the high-strength stainless steel stranded wire; the length of the positive and negative nuts is more than or equal to 2 times of the length of the positive and negative split bolts; the front and back split bolts and the front and back nuts are 304 stainless steel pieces.
Further, the distance control device comprises a cushion block arranged on the periphery of the original concrete member, an arc-shaped surface matched with the chamfer angle arranged on the periphery of the original concrete member is arranged on the inner side of the cushion block, and an arc-shaped groove for embedding the transverse high-strength stainless steel stranded wire is arranged on the outer side of the cushion block.
Further, the crossing part of the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire is fixed by using a stainless steel ribbon, so that a high-strength stainless steel stranded wire net is formed.
In addition, a construction method for the high-strength stainless steel stranded wire net reinforced ECC pretightening force tensioning reinforcing member is designed, and the construction method comprises the following steps:
1) Treating the surface of the original concrete member until the coarse aggregate is exposed, chamfering four corners of the original concrete member, and drilling bar planting holes at two ends of the original concrete member according to the bar planting intervals of the longitudinal high-strength stainless steel stranded wires; washing the surface of the original concrete member, cleaning the bar planting holes, and then naturally air-drying;
2) Planting bars at two ends of a longitudinal high-strength stainless steel strand, filling the cleaned bar planting holes with glue, planting one end of the longitudinal high-strength stainless steel strand until the bottom of the bar planting holes after the bar planting glue is filled in the bar planting holes, temporarily fixing the longitudinal high-strength stainless steel strand with an original concrete member, and anchoring and tensioning the steel strand after the bar planting glue is completely solidified;
3) Penetrating the longitudinal high-strength stainless steel stranded wires with the two ends being planted with the ribs into the forward and reverse opposite-pull bolts respectively, simultaneously screwing in the forward and reverse nuts, preliminarily determining the length of the longitudinal high-strength stainless steel stranded wires and the positions of the forward and reverse opposite-pull bolts, fixing the longitudinal high-strength stainless steel stranded wires by using aluminum buckles, and then pre-tightening the longitudinal high-strength stainless steel stranded wires by the forward and reverse nuts to finish tensioning construction of the longitudinal high-strength stainless steel stranded wires;
4) The distance control device is arranged at four corners of the original concrete member and is fixed at the position where the transverse high-strength stainless steel stranded wires are arranged; arranging the transverse high-strength stainless steel stranded wires on the outer sides of the longitudinal high-strength stainless steel stranded wires, penetrating forward and reverse opposite pull bolts at two ends respectively, simultaneously screwing forward and reverse nuts, preliminarily determining the length and the position of the transverse high-strength stainless steel stranded wires, fixing the transverse high-strength stainless steel stranded wires by using aluminum buckles, and pre-tightening the transverse high-strength stainless steel stranded wires by the forward and reverse nuts to finish tensioning construction of the transverse high-strength stainless steel stranded wires;
5) Fixing the crossing part of the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire to form a high-strength stainless steel stranded wire net, and then pouring the ECC reinforcing layer.
When drilling holes at two ends of an original concrete member according to the spacing of the longitudinal high-strength stainless steel stranded wires, proper depth and diameter of the drilling holes are required to be ensured, and then the longitudinal high-strength stainless steel stranded wires are implanted, so that the longitudinal high-strength stainless steel stranded wires are prevented from being pulled out during tensioning.
The front counter-pulling bolt and the front counter-pulling nut are made of 304 stainless steel, so that the strength, the rigidity, the deformation and other material performances of the front counter-pulling bolt and the front counter-pulling nut meet the requirements of structural deformation and energy consumption, the design of the front counter-pulling bolt is determined according to the design requirements of the structural performances, and enough pretightening force can be provided without being pulled out or sliding wires.
The beneficial effects of the invention are as follows:
compared with the prior art, the ECC material has better ductility, toughness and crack dispersion capability compared with the polymeric mortar, and the ECC reinforcing layer can directly participate in stress, and the high-strength stainless steel stranded wire has the advantages of extremely high tensile strength, corrosion resistance and the like compared with a steel wire rope, so that the novel composite material, namely the high-strength stainless steel stranded wire net for reinforcing the ECC, is formed by arranging the high-strength stainless steel stranded wire net in the middle of the ECC reinforcing layer through designing the distance control device, the defect that the traditional reinforcing layer does not directly participate in stress is overcome, and meanwhile, the pretightening force tensioning and reinforcing technology is used for tensioning transverse and longitudinal high-strength stainless steel stranded wires, so that the steel stranded wires can be stressed in advance, the development of cracks is effectively restrained, the rigidity after reinforcement is improved and the like, and the defect that the mechanical property of the high-strength stainless steel stranded wires cannot be fully exerted due to looseness in the reinforcing is avoided.
Moreover, the reinforced ECC of the high-strength stainless steel stranded wire net is simple and convenient to construct, high in cost performance, capable of directly bearing force, effectively improving the bearing capacity of the member, capable of showing plastic destruction characteristics after reinforcement, obviously improving ductility, and small in influence on the use space. In the process of reinforcing the ECC by using the high-strength stainless steel stranded wire net, the reinforcing effect of the composite material is good by fixing, stretching and distance control of the high-strength stainless steel stranded wire net.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a structure of a tensile reinforcement member for enhancing ECC pretightening force by a high-strength stainless steel stranded wire net;
FIG. 2 is a side view of the device shown in FIG. 1;
FIG. 3 is a cross-sectional view taken along A-A in FIG. 1;
FIG. 4 is a schematic view of the construction of a split bolt;
wherein a is an assembly drawing of the split bolt; b is a structure diagram of the forward/reverse bolt; c is a structure diagram of the split nut;
FIG. 5 is a schematic diagram of the distance control device; wherein e is a front view; f is a right view; g is a top view;
wherein: 1-a reinforced concrete original column; 2-longitudinal high-strength stainless steel stranded wires; 3-distance control means; 4-transverse high-strength stainless steel stranded wires; 5-a split bolt; 6-a reinforcing layer; 7-a reinforced concrete beam; 8-bar planting holes; 9-aluminum buckles; 10-forward bolts; 11-a split nut; 12-reversing bolts;
d is the diameter of the high-strength stainless steel stranded wire; l is the length of the forward/reverse bolt.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
The invention is further described below with reference to the accompanying drawings. As shown in fig. 1 to 5, in order to overcome the defects and technical shortcomings in the reinforcement of the existing high-strength stainless steel stranded wire net and improve the overall performance of the high-strength stainless steel stranded wire reinforcement member and provide effective restraint, the invention provides a high-strength stainless steel stranded wire net reinforced ECC pretightening force tensioning reinforcement member, which comprises an original concrete member and an ECC reinforcement layer 6 containing a high-strength stainless steel stranded wire net arranged outside the original concrete member, wherein the high-strength stainless steel stranded wire net is formed by a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires which are fixed in a crossing manner. The reinforcement member further comprises a distance control device 3, a split bolt 5 and an aluminum buckle 9; in addition, a bar planting hole 8 is arranged at the node area of the original concrete member, namely the reinforced concrete original column 1 and the reinforced concrete beam 7 and is used as an anchoring device at two ends of the longitudinal high-strength stainless steel stranded wire.
The bar planting hole 8 should incline 10-30 degrees to one side of the column shaft, and the projection length in the direction parallel to the column shaft should not be less than 40d, the drilling diameter is not easy to be less than 3.5d, wherein d is the diameter of the high-strength stainless steel stranded wire; so as to ensure enough adhesive force after the bar is planted; the bar planting holes 8 are required to be cleaned, dust in the holes is punched, so that enough adhesive force is ensured after bar planting, and the longitudinal high-strength stainless steel stranded wires 2 cannot be pulled out.
The distance control devices 3 are arranged at four corners of the reinforced concrete original column 1, and the distance control devices 3 need to be fixed at four corners of the column by using steel adhesive in advance so as to ensure that the distance control devices 3 do not slide.
The split bolt 5 comprises a split nut 11, a corresponding forward bolt 10 and a corresponding reverse bolt 12, and the other ends of the forward bolt 10 and the reverse bolt 12 are annular. The longitudinal high-strength stainless steel stranded wires 2 and the transverse high-strength stainless steel stranded wires 4 are connected with the forward bolts 10 and the reverse bolts 12 by using aluminum buckles 9, so that tight occlusion between the aluminum buckles and the high-strength stainless steel stranded wires is required to be ensured, and firm connection between the high-strength stainless steel stranded wires and the forward and reverse bolts is ensured.
In addition, the invention also provides a construction method for the tensile reinforcement member with the ECC pretightening force reinforced by the high-strength stainless steel stranded wire net, which specifically comprises the following steps:
step 1: firstly, roughening the surface of a reinforced concrete original column 1 until a concrete member exposes coarse aggregate, chamfering four corners of the member, and drilling a reinforced hole 8 in a concrete beam 7 at two ends of the member according to the reinforced bar planting distance of a longitudinal high-strength stainless steel strand 2, wherein the drilling position and the diameter are required to meet the subsequent construction requirement, namely, the longitudinal high-strength stainless steel strand 2 and the member are ensured to be parallel and the sufficient reinforced bar planting length is ensured; and (3) flushing the surface of the reinforced concrete column 1 by using a high-pressure water gun, cleaning the bar planting holes 8, and then naturally air-drying.
Step 2: and (3) planting bars at two ends of the longitudinal high-strength stainless steel stranded wire 2, injecting glue into the washed bar planting holes 8 by using injection type bar planting glue, slowly injecting the glue from bottom to top, slowly rotating and planting one end of the longitudinal high-strength stainless steel stranded wire 2 in a clockwise direction until one end of the high-strength stainless steel stranded wire reaches the bottom of the holes after the hole is fully filled with the bar planting glue, temporarily fixing the high-strength stainless steel stranded wire with a member by using an adhesive tape, and anchoring and tensioning the steel stranded wire after the bar planting glue is fully solidified.
Step 3: the longitudinal high-strength stainless steel stranded wires 2 with the two ends being planted with the ribs penetrate into the forward bolts 10 and the reverse bolts 12 respectively, the opposite-pull nuts 11 are screwed in at the same time by about 1/3 and not less than 3-5 mm, the lengths of the longitudinal high-strength stainless steel stranded wires 2 and the positions of the forward bolts 10 and the reverse bolts 12 are preliminarily determined, the aluminum buckles 9 are used for fixing, the longitudinal high-strength stainless steel stranded wires are pretensioned by the opposite-pull nuts 11, the pretensioning force of the longitudinal high-strength stainless steel stranded wires is about 10% -20% of the limit stress of the high-strength stainless steel stranded wires, the tensioning construction of the longitudinal high-strength stainless steel stranded wires is completed, the longitudinal high-strength stainless steel stranded wires are guaranteed to have enough pretensioning force, the crack development of test pieces can be effectively restrained, and the longitudinal high-strength stainless steel stranded wires are stressed in advance.
Step 4: the distance control device 3 is arranged at four corners of the component and fixed at the position where the transverse high-strength stainless steel stranded wires 4 are arranged by using adhesive steel glue, so that the distance between the high-strength stainless steel stranded wires and the original component can be controlled more accurately; the two ends of the transverse (annular) high-strength stainless steel stranded wire 4 are respectively penetrated into the forward bolt 10 and the reverse bolt 12, and simultaneously the opposite-pull nut 11 is screwed in about 1/3, the length and the position of the transverse high-strength stainless steel stranded wire 4 are preliminarily determined, the aluminum buckle 9 is used for fixing, the opposite-pull nut 11 is used for pre-tightening, the pre-tightening force is about 10% -20% of the limit stress of the high-strength stainless steel stranded wire, and the tensioning construction of the transverse steel stranded wire is completed, so that the transverse high-strength stainless steel stranded wire has enough pre-tightening force, the crack development of a test piece can be effectively restrained, and the transverse high-strength stainless steel stranded wire is stressed in advance.
Step 5: and fixing the crossing part of the longitudinal steel strand and the transverse steel strand by using a stainless steel ribbon to form a high-strength stainless steel strand net, and then pouring the ECC.
Drilling holes at two ends of the reinforcing member according to the spacing of the longitudinal high-strength stainless steel strands, ensuring proper depth and diameter of the drilling holes, and then implanting the longitudinal high-strength stainless steel strands to ensure that the longitudinal high-strength stainless steel strands are not pulled out during tensioning.
The front and back bolts and the front and back nuts are made of 304 stainless steel to ensure that the strength, rigidity, deformation and other material performances meet the requirements of structural deformation and energy consumption, the design of the front and back screws is determined according to the design requirements of the structural performances, and enough pretightening force can be provided without being pulled out or sliding wires.
According to the tension reinforcement member and the construction method for the reinforced ECC pretightening force of the high-strength stainless steel stranded wire net, disclosed by the invention, the operation is simple and convenient in the reinforcement process, the construction is easy, the reinforcement member is not influenced by a construction site, the pretightening force effect is good, the implanted steel bar anchoring can provide enough tension, and the distance between the high-strength stainless steel stranded wire and the original member can be accurately controlled.
According to the high-strength stainless steel stranded wire net reinforced ECC pretightening force tensioning reinforcing member and the construction method, the original member is reinforced by using the high-strength stainless steel stranded wire net reinforced ECC, and steel stranded wire bar planting is carried out at two ends of the member.
The original concrete member is subjected to roughening and chamfering treatment before reinforcement.
The reinforcing member is used for stretching the longitudinal high-strength stainless steel stranded wires, holes are drilled in the end portions, the high-strength stainless steel stranded wires are implanted, and the diameters of the high-strength stainless steel stranded wires are not easy to be smaller than 1.2mm and not easy to be larger than 6mm.
When the pretightening force of the high-strength stainless steel stranded wire net is tensioned, firstly, the embedded steel bars of the longitudinal high-strength stainless steel stranded wire are anchored, then the longitudinal high-strength stainless steel stranded wire is tensioned, finally, the transverse steel stranded wire is arranged on the outer side of the longitudinal steel stranded wire for tensioning, and the pretightening force of the high-strength stainless steel stranded wire is not more than 20% of the limit stress of the steel stranded wire.
When the transverse high-strength stainless steel stranded wire is stretched, a distance control device is used at the chamfer of the original component, so that the distance between the transverse high-strength stainless steel stranded wire and the original component can be well controlled, the transverse high-strength stainless steel stranded wire can be stretched well, the distance between the transverse high-strength stainless steel stranded wire and the original component is not easy to be less than 10mm so as to ensure construction, and meanwhile, the distance is not easy to be greater than 1/2 of the thickness of the reinforcing layer 6.
The Zhang Lagao strong stainless steel stranded wire net and the original member concrete are controlled in distance, the high-strength stainless steel stranded wire net is arranged in the middle of the ECC reinforcing layer, a novel composite material, namely the high-strength stainless steel stranded wire net is formed to strengthen the ECC, so that the whole composite material is stressed, the influence of the high-strength stainless steel stranded wire net on the bonding effect between the reinforcing layer ECC and the original member concrete is greatly reduced, and the bonding performance between the reinforcing layer and the original member concrete can be better ensured.
The high-strength stainless steel stranded wire has high tensile strength and corrosion resistance, can effectively improve the bending resistance, the shearing resistance bearing capacity and the rigidity of the reinforcing member, has good crack dispersion capacity, can play a better constraint role when being used together, and can obviously improve the ductility of the original member.
When the longitudinal high-strength stainless steel stranded wires are arranged, holes are drilled at two ends of an original component and used as pore channels for planting the steel strands of the longitudinal high-strength stainless steel stranded wire net, the steel planting holes are required to be inclined to one side of the column shaft by 10-30 degrees, the projection length in the direction parallel to the column shaft is not less than 40d, the diameter of the drilled holes is not easy to be less than 3.5d, and enough bonding force is ensured after the steel planting of the steel strands, wherein d is the diameter of the high-strength stainless steel stranded wires.
When holes are drilled at two ends of an original component, the holes are required to be cleaned, dust in the holes is punched out, so that the bar planting glue at two ends can fully play a role, enough adhesive force is provided after bar planting, and the longitudinal high-strength stainless steel stranded wires cannot be pulled out at the bar planting positions.
When the transverse high-strength stainless steel stranded wire net is arranged, distance control devices are required to be arranged at the chamfer positions around the original component, the distance between the transverse high-strength stainless steel stranded wire and the original component is ensured, and the distance control devices are required to be fixed at four corners of the column in advance by using steel adhesive, so that the distance control devices cannot slide.
When the high-strength stainless steel stranded wire is stretched, the positive and negative nut sleeve and the corresponding split bolt are used, the positive and negative nut sleeve is fixed by the fixed spanner, and simultaneously the split bolts at the two ends are rotated to stretch, so that pretightening force can be well applied to the longitudinal and transverse high-strength stainless steel stranded wire, the length of the positive and negative split bolt is not less than 12d and not easy to be less than 2cm, and the length of the positive and negative nut is not easy to be less than 2 times of the length of the bolt.
The front bolt and the back bolt are connected with the high-strength stainless steel stranded wire through an aluminum buckle, and tight occlusion between the aluminum buckle and the high-strength stainless steel stranded wire is required to be ensured.
The stretch-draw connection parts of the longitudinal high-strength stainless steel stranded wires are arranged in a staggered manner up and down, and the stretch-draw connection parts of the transverse high-strength stainless steel stranded wires are arranged in a staggered manner front and back and left and right.
ECC is used as a reinforcing layer to directly participate in stress, has obvious strain hardening and excellent crack control capability when being pulled, and has limit tensile strain not lower than 3%.
In summary, according to the high-strength stainless steel stranded wire net reinforced ECC pretightening force tensioning and reinforcing member and the construction method, pretightening force can be effectively provided when the original member is reinforced by the high-strength stainless steel stranded wire, meanwhile, the distance between the high-strength stainless steel stranded wire and the original member can be controlled, and the overall performance of the reinforced member can be better improved. The bearing capacity of the reinforced member is obviously improved, the characteristic of plastic damage is obvious, the ductility is obviously improved, and the high-strength stainless steel stranded wire pretightening force device is used, so that the coordinated deformation capacity between the high-strength stainless steel stranded wire and the ECC can be effectively guaranteed, the crack development is effectively restrained, the rigidity of the reinforced member is improved, the characteristic of multi-crack cracking of the ECC is fully exerted, the reinforcement accuracy and effectiveness are realized, and meanwhile, the cooperative work of the high-strength stainless steel stranded wire and the ECC can be guaranteed.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The tensioning reinforcement member comprises an original concrete member and an ECC reinforcement layer which is arranged outside the original concrete member and contains a high-strength stainless steel stranded wire net, wherein the high-strength stainless steel stranded wire net is formed by a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires which are fixed in a crossing manner; characterized in that it also comprises
The distance control device is fixed around the original concrete member and used for controlling the distance between the high-strength stainless steel stranded wire net and the original concrete member, so that the high-strength stainless steel stranded wire net is positioned in the middle of the ECC reinforcing layer;
the pretightening force control device is used for applying pretightening force to the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire;
anchoring devices positioned at two ends of the original concrete member; one end of the longitudinal high-strength stainless steel stranded wire is connected with a pretightening force control device, and the other end of the longitudinal high-strength stainless steel stranded wire is fixed at the end part of the original concrete member through the anchoring device;
the distance control device comprises a cushion block arranged on the periphery of the original concrete member, wherein the inner side of the cushion block is provided with an arc surface matched with the chamfer angle arranged on the periphery of the original concrete member, and the outer side of the cushion block is provided with an arc groove for embedding a transverse high-strength stainless steel stranded wire;
the pretightening force control device comprises a positive and negative nut and a corresponding positive and negative split bolt, wherein the other end of the positive and negative split bolt is annular, and an aluminum buckle is used for connecting high-strength stainless steel stranded wires;
the anchoring device is a bar planting anchoring structure, and the bar planting anchoring structure comprises bar planting holes arranged at two ends of an original concrete member;
the distance between the transverse high-strength stainless steel stranded wires and the original concrete member is greater than or equal to 10mm and is smaller than or equal to 1/2 of the thickness of the ECC reinforcing layer; the reinforcement planting hole is inclined to one side of the original concrete member by 10-30 degrees, the projection length of the reinforcement planting hole in the direction parallel to the side surface of the original concrete member is greater than or equal to 40d, and the diameter of the reinforcement planting hole is greater than or equal to 3.5d, wherein d is the diameter of the high-strength stainless steel stranded wire; the diameter d of the high-strength stainless steel stranded wire is more than or equal to 1.2mm and less than or equal to 6mm;
the transverse high-strength stainless steel stranded wires are arranged on the outer sides of the longitudinal high-strength stainless steel stranded wires; and the stretching connection parts of the longitudinal high-strength stainless steel stranded wires are staggered up and down, and the stretching connection parts of the transverse high-strength stainless steel stranded wires are staggered front and back and left and right.
2. The tensile reinforcement member for the reinforced ECC pretightening force of the high-strength stainless steel strand net of claim 1, wherein the length of the forward and reverse split bolts is 12d or more, where d is the diameter of the high-strength stainless steel strand; the length of the positive and negative nuts is more than or equal to 2 times of the length of the positive and negative split bolts; the front and back split bolts and the front and back nuts are 304 stainless steel pieces.
3. The reinforced ECC pretension tensile reinforcement member for high-strength stainless steel stranded wire net reinforcement according to claim 1, wherein the intersections of the longitudinal high-strength stainless steel stranded wires and the transverse high-strength stainless steel stranded wires are fixed by using stainless steel ties, forming a high-strength stainless steel stranded wire net.
4. A method of constructing a high strength stainless steel strand net reinforced ECC pretension tensile reinforcement member according to any one of claims 1 to 3, comprising the steps of:
1) Treating the surface of the original concrete member until the coarse aggregate is exposed, chamfering four corners of the original concrete member, and drilling bar planting holes at two ends of the original concrete member according to the bar planting intervals of the longitudinal high-strength stainless steel stranded wires; washing the surface of the original concrete member, cleaning the bar planting holes, and then naturally air-drying;
2) Planting bars at two ends of a longitudinal high-strength stainless steel strand, filling the cleaned bar planting holes with glue, planting one end of the longitudinal high-strength stainless steel strand until the bottom of the bar planting holes after the bar planting glue is filled in the bar planting holes, temporarily fixing the longitudinal high-strength stainless steel strand with an original concrete member, and anchoring and tensioning the steel strand after the bar planting glue is completely solidified;
3) Penetrating the longitudinal high-strength stainless steel stranded wires with the two ends being planted with the ribs into the forward and reverse opposite-pull bolts respectively, simultaneously screwing in the forward and reverse nuts, preliminarily determining the length of the longitudinal high-strength stainless steel stranded wires and the positions of the forward and reverse opposite-pull bolts, fixing the longitudinal high-strength stainless steel stranded wires by using aluminum buckles, and then pre-tightening the longitudinal high-strength stainless steel stranded wires by the forward and reverse nuts to finish tensioning construction of the longitudinal high-strength stainless steel stranded wires;
4) The distance control device is arranged at four corners of the original concrete member and is fixed at the position where the transverse high-strength stainless steel stranded wires are arranged; arranging the transverse high-strength stainless steel stranded wires on the outer sides of the longitudinal high-strength stainless steel stranded wires, penetrating forward and reverse opposite pull bolts at two ends respectively, simultaneously screwing forward and reverse nuts, preliminarily determining the length and the position of the transverse high-strength stainless steel stranded wires, fixing the transverse high-strength stainless steel stranded wires by using aluminum buckles, and pre-tightening the transverse high-strength stainless steel stranded wires by the forward and reverse nuts to finish tensioning construction of the transverse high-strength stainless steel stranded wires;
5) Fixing the crossing part of the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire to form a high-strength stainless steel stranded wire net, and then pouring the ECC reinforcing layer.
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