CN114737784A - High-strength stainless steel stranded wire net reinforced ECC (error correction code) pre-tightening force tensioning and reinforcing member and construction method thereof - Google Patents
High-strength stainless steel stranded wire net reinforced ECC (error correction code) pre-tightening force tensioning and reinforcing member and construction method thereof Download PDFInfo
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- 230000002787 reinforcement Effects 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
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- E—FIXED CONSTRUCTIONS
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- 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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Abstract
The invention relates to the technical field of civil engineering, in particular to a high-strength stainless steel stranded wire net reinforced ECC pre-tightening 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 crossing and fixing a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires; the reinforcing component also comprises a distance control device, a pretightening force control device and anchoring devices positioned at two ends of the original concrete component. The invention has simple and convenient 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 problem that the mechanical property of the high-strength stainless steel strand can not be fully exerted because the high-strength stainless steel strand is loosened during reinforcement, can more accurately control the distance between the steel strand and the original component, ensure that the reinforcement material fully exerts the mechanical property and achieve the ideal reinforcement effect.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a high-strength stainless steel stranded wire mesh reinforced ECC (error correction code) pre-tightening force tensioning reinforcing member and a construction method thereof, which are used for reinforcing concrete structures such as columns and beams.
Background
With the rapid development of economy in China, the construction industry in China has already entered the development period with the key points of modernization, maintenance and reinforcement, and the existing reinforcement technology mainly comprises the following steps: steel wire rope reinforcement, prestressed steel strand net-polymer mortar reinforcement, FRP reinforced ECC reinforcement and the like. However, the existing reinforcement technology has a certain disadvantage, for example, the mechanical properties of the steel wire rope cannot be fully exerted due to the fact that the steel wire rope is loosened during reinforcement because no prestress is applied during steel wire rope reinforcement, and the mechanical properties of the reinforcement column are not improved because the tensile strength of the polymer mortar is low during reinforcement of the prestressed steel strand net-polymer mortar and does not participate in direct stress.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-strength stainless steel stranded wire net reinforced ECC pre-tightening force tensioning reinforcing member and a construction method thereof, which have the advantages of simple and convenient construction and easy operation, can lead the steel stranded wires to be stressed in advance by applying the pre-tightening force, effectively inhibit the development of cracks, improve the rigidity after reinforcement and the like, effectively avoid that the mechanical property of the high-strength stainless steel stranded wires cannot be fully exerted due to the looseness of the high-strength stainless steel stranded wires during reinforcement, can more accurately control the distance between the steel stranded wires and the original member, ensure that the reinforcing material fully exerts the mechanical property of the reinforcing material, and achieve the ideal reinforcing effect.
In order to achieve the purpose, the technical scheme of the invention is as follows:
designing a high-strength stainless steel stranded wire net reinforced ECC pre-tightening force tensioning and reinforcing member, which 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, wherein the high-strength stainless steel stranded wire net is formed by fixing a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires in a crossed manner; the reinforcing component also comprises a distance control device, a pretightening force control device and anchoring devices positioned at two ends of the original concrete component;
the distance control device is fixed on the periphery of 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 pre-tightening force control device applies pre-tightening 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 pre-tightening 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.
Furthermore, the pretightening force control device comprises a positive nut and a negative nut and a corresponding positive counter-pull bolt, the other end of the positive counter-pull bolt is annular, and an 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 formed in two ends of the original concrete member.
Furthermore, the embedded bar hole inclines by 10-30 degrees to one side of the original concrete member, the projection length in the direction parallel to the side face of the original concrete member is greater than or equal to 40d, the diameter of the embedded bar hole is greater than or equal to 3.5d, and 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 6 mm.
Further, the transverse high-strength stainless steel stranded wire is arranged on the outer side of the longitudinal high-strength stainless steel stranded wire; and the tension connection parts of the longitudinal high-strength stainless steel strands are arranged in a vertically staggered manner, and the tension connection parts of the transverse high-strength stainless steel strands are arranged in a front-back, left-right staggered manner.
Further, the distance between the transverse high-strength stainless steel stranded wire and the original concrete member is greater than or equal to 10mm, and is less than or equal to 1/2 of the thickness of the ECC reinforcing layer.
Further, the length of the positive and negative counter-pull bolts is greater 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 counter-pull bolt; the front and back counter-pull bolt and the front and back nut are 304 stainless steel pieces.
Further, the distance control device comprises cushion blocks arranged on the periphery of the original concrete component, arc-shaped surfaces matched with chamfers arranged on the periphery of the original concrete component are arranged on the inner sides of the cushion blocks, and arc-shaped grooves used for embedding the transverse high-strength stainless steel stranded wires are arranged on the outer sides of the cushion blocks.
Furthermore, the crossed part of the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire is fixed by a stainless steel binding belt to form a high-strength stainless steel stranded wire net.
In addition, the construction method for the high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning reinforcing member comprises the following steps:
1) processing the surface of the original concrete member until 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 longitudinal high-strength stainless steel stranded wire bar planting distance; washing the surface of the original concrete member, cleaning the plant reinforcement holes, and then naturally drying;
2) planting bars at two ends of the longitudinal high-strength stainless steel stranded wire, pouring glue into the washed bar planting holes, planting one end of the longitudinal high-strength stainless steel stranded wire into 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 stranded wire and an original concrete component, and anchoring and tensioning the steel stranded wire after the bar planting glue is completely cured;
3) respectively penetrating the longitudinal high-strength stainless steel stranded wires with the bars planted at the two ends into positive and negative counter-pull bolts, simultaneously screwing positive and negative nuts, preliminarily determining the length of the longitudinal high-strength stainless steel stranded wires and the positions of the positive and negative counter-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 using the positive and negative nuts to finish the tensioning construction of the longitudinal high-strength stainless steel stranded wires;
4) placing the distance control devices at four corners of the original concrete member and fixing the distance control devices at the positions where the transverse high-strength stainless steel stranded wires are arranged; arranging the transverse high-strength stainless steel stranded wire on the outer side of the longitudinal high-strength stainless steel stranded wire, respectively penetrating positive and negative counter-pull bolts at two ends, simultaneously screwing positive and negative nuts, preliminarily determining the length and the position of the transverse high-strength stainless steel stranded wire, fixing by using aluminum buckles, and then pre-tightening by using the positive and negative nuts to finish the tensioning construction of the transverse high-strength stainless steel stranded wire;
5) and fixing the crossed 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 holes are drilled at two ends of an original concrete member according to the distance between the longitudinal high-strength stainless steel stranded wires, the depth and the diameter of the drilled holes are required to be appropriate, and then the longitudinal high-strength stainless steel stranded wires are implanted to ensure that the longitudinal high-strength stainless steel stranded wires are not pulled out during tensioning.
The front and back counter-pull bolts and the front and back nuts are made of 304 stainless steel to ensure that the strength, rigidity, deformation and other material properties meet the requirements of structural deformation and energy consumption capacity, and the design of the front and back bolts is determined according to the design requirements of the structural properties, so that enough pre-tightening force can be provided and the bolts cannot be pulled out or slip.
The beneficial effects of the invention are:
compared with the prior reinforcing technology, the ECC material used by the invention has better ductility, toughness and crack dispersion capability compared with the polymer mortar, and the ECC reinforcing layer can directly participate in stress, compared with the steel wire rope, the high-strength stainless steel stranded wire has the advantages of extremely high tensile strength, corrosion resistance and the like, therefore, the invention designs a distance control device to arrange the high-strength stainless steel stranded wire net in the middle of the ECC reinforcing layer to form a novel composite material, namely the high-strength stainless steel stranded wire net reinforced ECC, overcomes the defect that the existing reinforcing layer does not directly participate in stress, and simultaneously uses a pre-tightening force tensioning reinforcing technology, the transverse and longitudinal high-strength stainless steel stranded wires are subjected to pre-tightening force tensioning, so that the steel stranded wires are stressed in advance, the development of cracks is effectively inhibited, the rigidity after reinforcement is improved, and the problem that the mechanical properties of the high-strength stainless steel stranded wires cannot be fully exerted due to the fact that the high-strength stainless steel stranded wires are loosened during reinforcement is avoided.
Moreover, the high-strength stainless steel stranded wire mesh reinforced ECC is simple and convenient to construct, high in cost performance, capable of being directly stressed, capable of effectively improving the bearing capacity of the member, capable of showing a plastic failure characteristic after being reinforced, capable of obviously improving ductility and small in influence on a use space. In the process of reinforcing the ECC by using the high-strength stainless steel stranded wire net, the composite material has a good reinforcing effect by fixing, tensioning 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 required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of an ECC pre-tightening force tensioning and reinforcing member for reinforcing a high-strength stainless steel stranded wire mesh according to the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic structural view of a split bolt;
wherein a is an assembly drawing of the split bolt; b is a structural diagram of a forward/reverse bolt; c is a structure diagram of the split nut;
FIG. 5 is a schematic view of the structure of the distance control device; wherein e is a front view; f is a right view; g is a top view;
wherein: 1-reinforced concrete original column; 2-longitudinal high-strength stainless steel stranded wire; 3-a distance control device; 4-transverse high-strength stainless steel stranded wire; 5-split bolts; 6-reinforcing layer; 7-a reinforced concrete beam; 8-planting tendon holes; 9-aluminum buckle; 10-a positive bolt; 11-split nuts; 12-a reversing bolt;
d is the diameter of the high-strength stainless steel stranded wire; l is the length of the forward/reverse bolt.
Detailed Description
In order to make 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 described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention will be further explained with reference to the drawings. As shown in fig. 1 to 5, in order to overcome the defects and technical deficiencies in the conventional high-strength stainless steel stranded wire net reinforcement, 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 pre-tightening force tension reinforcement member, which comprises an original concrete member and an ECC reinforcement layer 6 containing the 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 fixing a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires in a crossed manner. The reinforcing 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 in the node area of the original concrete member, namely the original reinforced concrete column 1 and the reinforced concrete beam 7, and is used as an anchoring device for two ends of the longitudinal high-strength stainless steel stranded wire.
The bar planting holes 8 are inclined towards one side of the column body by 10-30 degrees, the projection length in the direction parallel to the column body is not smaller than 40d, the diameter of a drilled hole is not smaller than 3.5d easily, and d is the diameter of the high-strength stainless steel stranded wire; so as to ensure enough cohesive force after the bar planting; the rebar holes 8 need to be cleaned, and dust in the holes needs to be punched out, so that enough bonding force is guaranteed after rebar planting, and the longitudinal high-strength stainless steel stranded wires 2 cannot be pulled out.
The split bolt 5 comprises a split nut 11 and 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 wire 2 and the transverse high-strength stainless steel stranded wire 4 are connected with the forward bolt 10 and the backward bolt 12 through the aluminum buckles 9, tight engagement between the aluminum buckles and the high-strength stainless steel stranded wires needs to be guaranteed, and the high-strength stainless steel stranded wires are firmly connected with the forward bolt and the backward bolt.
In addition, the invention also provides a construction method for the high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning reinforcing member, which specifically comprises the following steps:
step 1: firstly, chiseling the surface of a reinforced concrete original column 1 until a concrete member is exposed with coarse aggregate, then chamfering the four corners of the member, and drilling bar planting holes 8 in concrete beams 7 at two ends of the member according to the bar planting intervals of longitudinal high-strength stainless steel stranded wires 2, wherein the drilling positions and diameters are required to meet the subsequent construction requirements, namely, the longitudinal high-strength stainless steel stranded wires 2 are ensured to be parallel to the direction of the member and the sufficient bar planting lengths are ensured; and (3) washing the surface of the reinforced concrete original column 1 by using a high-pressure water gun, cleaning the reinforcing bar holes 8, and naturally drying.
Step 2: bar planting is carried out on two ends of a longitudinal high-strength stainless steel stranded wire 2, injection type bar planting glue is used for pouring glue into a cleaned bar planting hole 8, slow injection is carried out from bottom to top, after the bar planting glue is filled in a drilled hole, one end of the longitudinal high-strength stainless steel stranded wire 2 is slowly and rotatably implanted along the clockwise direction until one end of the high-strength stainless steel stranded wire reaches the bottom of the hole, the high-strength stainless steel stranded wire and a component are temporarily fixed through an adhesive tape, and after the bar planting glue is completely cured, anchoring and tensioning of the steel stranded wire are carried out.
And step 3: the method comprises the steps of respectively penetrating a longitudinal high-strength stainless steel stranded wire 2 with steel bars planted at two ends into a forward bolt 10 and a backward bolt 12, simultaneously screwing a split nut 11 to about 1/3 mm, wherein the length of the longitudinal high-strength stainless steel stranded wire 2 and the positions of the forward bolt 10 and the backward bolt 12 are preliminarily determined, fixing the longitudinal high-strength stainless steel stranded wire by using an aluminum buckle 9, pre-tightening the split nut 11, wherein the pre-tightening force is about 10% -20% of the ultimate stress of the high-strength stainless steel stranded wire, completing the tensioning construction of the longitudinal steel stranded wire, ensuring that the longitudinal high-strength stainless steel stranded wire has enough pre-tightening force, effectively inhibiting the development of test piece cracks and enabling the longitudinal high-strength stainless steel stranded wire to be stressed in advance.
And 4, step 4: the distance control device 3 is placed at four corners of the component and is fixed at the position where the transverse high-strength stainless steel stranded wire 4 is arranged by using a steel adhesive, so that the distance between the high-strength stainless steel stranded wire net and the original component can be accurately controlled; the method comprises the steps of respectively penetrating two ends of a transverse (annular) high-strength stainless steel stranded wire 4 into a forward bolt 10 and a reverse bolt 12, simultaneously screwing a split nut 11 to 1/3, preliminarily determining the length and the position of the transverse high-strength stainless steel stranded wire 4, fixing the transverse high-strength stainless steel stranded wire by using an aluminum buckle 9, pre-tightening the split nut 11, and completing the tensioning construction of the transverse steel stranded wire, so that the transverse high-strength stainless steel stranded wire has enough pre-tightening force, the development of test piece cracks can be effectively inhibited, and the transverse high-strength stainless steel stranded wire is stressed in advance.
And 5: and fixing the crossed 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 ECC.
Drilling holes at two ends of the reinforcing member according to the distance between the longitudinal high-strength stainless steel stranded wires, ensuring the proper depth and diameter of the drilled holes, implanting the longitudinal high-strength stainless steel stranded wires, and ensuring that the longitudinal high-strength stainless steel stranded wires are not pulled out during tensioning.
The positive and negative bolts and the positive and negative nuts are made of 304 stainless steel to ensure that the strength, rigidity, deformation and other material properties meet the requirements of structural deformation and energy consumption capacity, the design of the positive and negative screws is determined according to the design requirements of the structural properties, and enough pretightening force can be provided without being pulled out or slipping.
The high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning reinforcing component and the construction method have the advantages that the operation is simple and convenient in the reinforcing process, the construction is easy, the construction is not influenced by a construction site, the pre-tightening force effect is good, the embedded steel bar anchoring can provide enough tension, and the distance between the high-strength stainless steel stranded wire mesh and an original component can be accurately controlled.
The high-strength stainless steel stranded wire mesh reinforced ECC (error correction code) pre-tightening force tensioning and reinforcing component and the construction method reinforce an original component by using the high-strength stainless steel stranded wire mesh reinforced ECC, and steel stranded wires are embedded with bars at two ends of the component.
The original concrete member needs to be subjected to chiseling and chamfering before reinforcement.
The longitudinal high-strength stainless steel stranded wire for tensioning the reinforcing member needs to be drilled at the end part and implanted with the high-strength stainless steel stranded wire, and the diameter of the high-strength stainless steel stranded wire is not easy to be smaller than 1.2mm and not easy to be larger than 6 mm.
When the high-strength stainless steel stranded wire net is tensioned, firstly, the longitudinal high-strength stainless steel stranded wire is subjected to bar planting anchoring, 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 pre-tightening force of the high-strength stainless steel stranded wire is not more than 20% of the ultimate stress of the steel stranded wire.
When the transverse high-strength stainless steel stranded wire is tensioned, a distance control device is used at the chamfer angle of an 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 tensioned well, the distance between the transverse high-strength stainless steel stranded wire and the original component is not easy to be smaller than 10mm so as to ensure construction, and meanwhile, the distance is not easy to be larger than 1/2 with the thickness of the reinforcing layer 6.
The distance between the high-strength stainless steel stranded wire mesh and the original member concrete is controlled, the high-strength stainless steel stranded wire mesh is arranged in the middle of the ECC reinforcing layer, a novel composite material, namely the high-strength stainless steel stranded wire mesh reinforced ECC is formed, the whole stress is enabled, meanwhile, the influence of the high-strength stainless steel stranded wire mesh on the bonding effect between the ECC reinforcing layer and the original member concrete is greatly reduced, and the bonding performance between the reinforcing layer and the original member concrete can be better guaranteed.
The high-strength stainless steel stranded wire is high in tensile strength and corrosion-resistant, the bending resistance, the shearing resistance and the rigidity of the reinforcing member can be effectively improved, the engineering cement-based composite material ECC has good crack dispersing capacity, and the high-strength stainless steel stranded wire and the engineering cement-based composite material ECC can play a better restraining role when being combined for use, so that the ductility of an original member can be obviously improved.
When the longitudinal high-strength stainless steel stranded wire is arranged, holes need to be drilled at two ends of an original component to serve as pore passages for planting the longitudinal high-strength stainless steel stranded wire net, the hole for planting the stainless steel stranded wire net needs to be inclined towards one side of the column body by 10-30 degrees, the projection length in the direction parallel to the column body is not smaller than 40d, the diameter of the drilled hole is not smaller than 3.5d easily, and therefore sufficient bonding force is guaranteed after the stainless steel stranded wire is planted, wherein d is the diameter of the high-strength stainless steel stranded wire.
When former component both ends drilling, need wash drilling, wash out downthehole dust to guarantee that both ends bar planting glue can the full play effect, have sufficient cohesive force behind the bar planting, vertical high strength stainless steel stranded conductor can not pulled out in the bar planting position.
When a transverse high-strength stainless steel stranded wire net is arranged, distance control devices are required to be arranged at the chamfer angles on the periphery of an 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 a column in advance by using adhesive steel glue so as to ensure that the distance control devices cannot slide.
When the high-strength stainless steel stranded wire is tensioned, 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, the split bolts at two ends are rotated to be tensioned, pre-tightening force can be better exerted on 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 is 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 positive and negative bolts are connected with the high-strength stainless steel stranded wire through aluminum buttons, and tight engagement between the aluminum buttons and the high-strength stainless steel stranded wire is required to be ensured.
The tensioning connection parts of the longitudinal high-strength stainless steel strands are arranged in a vertically staggered manner, and the tensioning connection parts of the transverse high-strength stainless steel strands are arranged in a front-back, left-right staggered manner.
The ECC is used as a reinforcing layer to directly participate in stress, has obvious strain hardening and excellent crack control capability when being tensioned, and has the ultimate tensile strain of not less than 3 percent.
In summary, the high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning reinforcing component and the construction method can effectively provide pre-tightening force when the high-strength stainless steel stranded wire is used for reinforcing an original component, can control the distance between the high-strength stainless steel stranded wire and the original component, and can better improve the overall performance of the reinforced component. The bearing capacity of the reinforced member is obviously improved, the reinforced member shows obvious plastic failure characteristics, the ductility is obviously improved, the high-strength stainless steel strand pre-tightening force device is used, the coordinated deformation capacity between the high-strength stainless steel strand and the ECC can be effectively ensured, the crack development is effectively inhibited, the rigidity of the reinforced member is improved, the characteristic of ECC multi-crack cracking is fully exerted, the accuracy and the effectiveness of reinforcement are realized, and meanwhile, the high-strength stainless steel strand and the ECC can be ensured to work cooperatively.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-strength stainless steel stranded wire net reinforced ECC pre-tightening force tensioning and reinforcing component comprises an original concrete component and an ECC reinforcing layer which is arranged outside the original concrete component and contains a high-strength stainless steel stranded wire net, wherein the high-strength stainless steel stranded wire net is formed by fixing a plurality of longitudinal high-strength stainless steel stranded wires and transverse high-strength stainless steel stranded wires in a crossed manner; it is characterized by also comprising
The distance control device is fixed on the periphery of 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 pre-tightening force control device is used for applying pre-tightening force to the longitudinal high-strength stainless steel stranded wire and the transverse high-strength stainless steel stranded wire;
and 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 the pre-tightening 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.
2. The high-strength stainless steel stranded wire mesh enhanced ECC pre-tightening force tensioning and reinforcing component of claim 1, wherein the pre-tightening force control device comprises a positive nut and a negative nut and a corresponding positive counter-pull bolt, the other end of the positive counter-pull bolt is annular, and an aluminum buckle is used for connecting the high-strength stainless steel stranded wires.
3. The high-strength stainless steel stranded wire mesh ECC pre-tightening force tensioning and reinforcing member as claimed in claim 1, wherein the anchoring device is a bar-embedded anchoring structure, and the bar-embedded anchoring structure comprises bar-embedded holes formed at two ends of an original concrete member.
4. The high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning and reinforcing member of claim 3, wherein the bar planting holes are inclined to one side of the original concrete member by 10-30 degrees, the projection length in the direction parallel to the side face of the original concrete member is greater than or equal to 40d, the diameter of each bar planting hole is greater than or equal to 3.5d, and d is the diameter of a 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 6 mm.
5. The high-strength stainless steel stranded wire mesh enhanced ECC pre-tightening force tensioning reinforcement member of claim 1, wherein 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 tension connection parts of the longitudinal high-strength stainless steel strands are arranged in a vertically staggered manner, and the tension connection parts of the transverse high-strength stainless steel strands are arranged in a front-back, left-right staggered manner.
6. The high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning reinforcing member as claimed in claim 1, wherein 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 less than or equal to 1/2 of the thickness of the ECC reinforcing layer.
7. The high-strength stainless steel stranded wire mesh enhanced ECC pre-tightening force tensioning reinforcement member of claim 2, wherein the length of the counter-pulling bolt is greater 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 counter-pull bolt; the front and back counter-pull bolt and the front and back nut are 304 stainless steel pieces.
8. The high-strength stainless steel stranded wire mesh enhanced ECC pre-tightening force tensioning and reinforcing component as claimed in claim 1, wherein the distance control device comprises a cushion block arranged around the original concrete component, an arc-shaped surface matched with the chamfer arranged around the original concrete component is arranged on the inner side of the cushion block, and an arc-shaped groove used for embedding the transverse high-strength stainless steel stranded wire is arranged on the outer side of the cushion block.
9. The high-strength stainless steel stranded wire mesh reinforced ECC pre-tightening force tensioning and reinforcing member as claimed in claim 1, wherein a stainless steel ribbon is used to fix the intersection of the longitudinal high-strength stainless steel stranded wires and the transverse high-strength stainless steel stranded wires to form the high-strength stainless steel stranded wire mesh.
10. A method for constructing a high-strength stainless steel wire mesh reinforced ECC pretension reinforcement member according to any one of claims 1 to 9, comprising the steps of:
1) processing the surface of the original concrete member until the coarse aggregate is exposed, then chamfering the four corners of the original concrete member, and drilling bar planting holes at the two ends of the original concrete member according to the longitudinal high-strength stainless steel stranded wire bar planting space; washing the surface of the original concrete member, cleaning the plant reinforcement holes, and then naturally drying;
2) planting bars at two ends of the longitudinal high-strength stainless steel stranded wire, pouring glue into the cleaned bar planting holes, planting one end of the longitudinal high-strength stainless steel stranded wire into 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 stranded wire and the original concrete member, and anchoring and tensioning the steel stranded wire after the bar planting glue is completely cured;
3) respectively penetrating the longitudinal high-strength stainless steel stranded wires with the bars planted at the two ends into positive and negative counter-pull bolts, simultaneously screwing positive and negative nuts, preliminarily determining the length of the longitudinal high-strength stainless steel stranded wires and the positions of the positive and negative counter-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 using the positive and negative nuts to finish the tensioning construction of the longitudinal high-strength stainless steel stranded wires;
4) placing the distance control devices at four corners of the original concrete member and fixing the distance control devices at the positions where the transverse high-strength stainless steel stranded wires are arranged; arranging the transverse high-strength stainless steel stranded wire on the outer side of the longitudinal high-strength stainless steel stranded wire, respectively penetrating positive and negative counter-pull bolts at two ends, simultaneously screwing positive and negative nuts, preliminarily determining the length and the position of the transverse high-strength stainless steel stranded wire, fixing by using aluminum buckles, and then pre-tightening by using the positive and negative nuts to finish the tensioning construction of the transverse high-strength stainless steel stranded wire;
5) and fixing the crossed 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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| CN202210530774.XA CN114737784B (en) | 2022-05-16 | 2022-05-16 | Tensioning and reinforcing member for reinforcing ECC (error correction code) pretightening force by high-strength stainless steel stranded wire net and construction method thereof |
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| CN202210530774.XA CN114737784B (en) | 2022-05-16 | 2022-05-16 | Tensioning and reinforcing member for reinforcing ECC (error correction code) pretightening force by high-strength stainless steel stranded wire net and construction method thereof |
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| US6219991B1 (en) * | 1990-08-06 | 2001-04-24 | Hexcel Corporation | Method of externally strengthening concrete columns with flexible strap of reinforcing material |
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