Annular prestress tensioning anchoring system and construction method

Abstract

The invention provides an annular prestress tensioning and anchoring system and a construction method, and belongs to the technical field of building reinforcement, the annular prestress tensioning and anchoring system is suitable for annular tensioning and reinforcement of a beam-column structure of a building, and comprises a slurry layer sprayed on the surface of the beam-column structure, and high-strength gridding cloth surrounding the beam-column structure and wrapped in the slurry layer, the anchor bearing is at least partially embedded into the slurry layer; an anchor groove is formed in the side, facing the beam column structure, of the anchor base. An anchor hole penetrates through the middle of the anchor base in the thickness direction. Wherein one end of the high-strength gridding cloth is anchored in the anchor groove, the other end of the high-strength gridding cloth is anchored in the anchor hole, and annular tensioning force is applied to the high-strength gridding cloth. According to the circumferential prestress tensioning and anchoring system and the construction method, damage to the original structure of the structure during circumferential tensioning and reinforcing construction of the structure can be avoided, and the circumferential prestress tensioning and reinforcing effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building reinforcement, and in particular relates to a hoop prestressed tensioning anchoring system and a construction method. Background Art

[0002] With the increase of service life and the influence of various complex reasons, buildings with reinforced concrete as the main structure will continue to have problems with bearing capacity, strength reduction, cracking and damage. At present, the beam and column structures of buildings with these problems are usually reinforced by hoop tensioning with high-strength mesh.

[0003] Most of the existing circumferential tension reinforcements are to anchor the two ends of the high-strength mesh cloth to the fixed end anchor and the tension end anchor respectively, and then load the high-strength mesh cloth with a jack to obtain a circumferential tension force. During the specific construction, both the fixed end anchor and the tension end anchor need to be fixed to the beam-column structure through anchor seats, which requires drilling holes in the beam-column structure and implanting anchor bolts to achieve the fixation of the anchor seats. Since drilling holes will cause damage to the original structure of the beam and column, it will have an adverse effect on the final effect of the prestressed tension reinforcement. Summary of the invention

[0004] The embodiment of the present invention provides a circumferential prestressed tensioning anchor system and a construction method, which aims to avoid damage to the original structure of the structure during the circumferential tensioning reinforcement construction of the structure, thereby improving the circumferential prestressed tensioning reinforcement effect.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: in the first aspect, a circumferential prestressed tension anchoring system is provided, which is suitable for the circumferential tension reinforcement of the beam-column structure of the structure, including a slurry layer sprayed on the surface of the beam-column structure, a high-strength mesh cloth surrounding the beam-column structure and wrapped in the slurry layer, and an anchor seat at least partially embedded in the slurry layer; an anchor groove is provided on the side of the anchor seat facing the beam-column structure, and an anchor hole is penetrated through the middle part of the anchor seat in the thickness direction; wherein, one end of the high-strength mesh cloth is anchored to the anchor groove, and the other end is anchored to the anchor hole, and a circumferential tensioning force is applied to the high-strength mesh cloth.

[0006] In combination with the first aspect, in a possible implementation, the anchor seat includes a base plate and a cover plate; the base plate is embedded in the slurry layer and is provided with an anchor groove, and a first groove is provided on the plate surface of the base plate facing away from the beam-column structure; the cover plate is detachably connected to the base plate, and a second groove is provided on the plate surface of the cover plate facing the base plate, the second groove and the first groove are buckled to form an anchor hole and cooperate to clamp the high-strength mesh cloth, and the high-strength mesh cloth is bonded to the anchor hole.

[0007] In some embodiments, a limiting plate is provided at one end of the high-strength mesh cloth, and the anchor groove includes a first groove body and a second groove body, the depth of the first groove body is greater than that of the second groove body, and a limiting surface is formed between the two; wherein, the limiting plate is embedded in the first groove body and abuts against the limiting surface along the tensioning direction, and the high-strength mesh cloth passes through the bottom plate from the second groove body and extends around the beam-column structure to the anchor hole.

[0008] Exemplarily, the bottoms of the first and second grooves are respectively used to support and constrain the cross-section of one end of the limit plate and the high-strength mesh cloth into a transverse wave surface; the first groove and the second groove are used to cooperate to clamp and constrain the cross-section of the other end of the high-strength mesh cloth into a transverse wave surface.

[0009] For example, the annular prestressed tensioning anchoring system also includes a plurality of limit supports distributed at intervals along the annular direction of the beam-column structure; the limit supports have a support curved surface for supporting the high-strength mesh cloth, and the support curved surfaces of each limit support jointly support the high-strength mesh cloth into a transverse wave curved surface.

[0010] In some embodiments, the bottoms of the first groove and the second groove both form longitudinal wave curved surfaces along the tensioning direction.

[0011] In combination with the first aspect, in a possible implementation, the circumferential prestressed tensioning anchoring system also includes a tensioning assembly, which is detachably connected to the anchor seat, and one end of the high-strength mesh cloth passes through the anchor hole and is connected to the output end of the tensioning assembly; wherein the tensioning assembly is used to apply circumferential tensioning force to the high-strength mesh cloth.

[0012] In some embodiments, the tensioning assembly includes: The thrust frame is detachably connected to the side of the anchor seat away from the beam-column structure, and has two insertion holes spaced apart along the width direction of the high-strength mesh cloth; The tensioning anchor plate is located on the side of the anchor seat and is provided with two ear seats, and the two ear seats are respectively penetrated with pressure-maintaining screws, the pressure-maintaining screws are threadedly matched with the ear seats, and the two pressure-maintaining screws are respectively inserted into the insertion holes correspondingly along the tensioning direction and rotatedly matched with the insertion holes; The gland is detachably connected to the tension anchor plate and cooperates with the tension anchor plate to anchor the end of the high-strength mesh cloth passing through the anchor hole. A limiting groove is provided in the center of the gland; The push member is arranged between the thrust frame and the limit groove and outputs the push force.

[0013] The beneficial effect of the annular prestressed tensioning anchor system provided by the present invention is that compared with the prior art, the annular prestressed tensioning anchor system of the present invention utilizes the anchor groove on the anchor seat to anchor with one end of the high-strength mesh cloth, and the anchor hole to anchor with the other end of the high-strength mesh cloth, while the anchor seat is at least partially pressed into the slurry layer, and there is no need to drill holes and plant reinforcement during construction. It is only necessary to connect the tensioning assembly to the anchor seat to apply annular tensioning force to the high-strength mesh cloth, so that the high-strength mesh cloth is in a tensioned state and the tensioning assembly can be removed after the slurry layer is solidified, thereby forming an annular prestressed tensioning anchor system in which the high-strength mesh cloth is wrapped in the solidified slurry layer, thereby avoiding damage to the original structure of the structure caused by drilling holes and planting reinforcement, and improving the annular prestressed tensioning reinforcement effect.

[0014] In a second aspect, an embodiment of the present invention further provides a circumferential prestressed tensioning anchoring construction method, which adopts the above-mentioned circumferential prestressed tensioning anchoring system, comprising: After determining the length of the high-strength mesh cloth, stick a limit piece on its first end; After cleaning the circumferential base surface at the location where the beam-column structure needs to be reinforced, spray the slurry layer and arrange the limit support parts; The first end with the limit plate attached is embedded in the anchor groove and fixed, so that the high-strength mesh cloth surrounds the beam-column structure and is supported on each limit support member, and then the second end of the high-strength mesh cloth is passed through the anchor hole and anchored between the tension anchor plate and the gland of the tension anchor; Install the thrust frame on the anchor seat, connect the tension anchor to the thrust frame, and apply a top thrust between the anchor seat and the tension anchor through the pressure-maintaining screw to tighten the beam-column structure with the high-strength mesh cloth; A thrust piece is installed between the thrust frame and the tension anchor to output a thrust force, so that the high-strength mesh cloth obtains a hoop tension force; After the slurry layer solidifies, the jacking members, tension anchors and thrust frames are removed.

[0015] In combination with the second aspect, in a possible implementation, the high-strength mesh cloth forms a transverse wave surface along its width direction based on the common limiting constraints of the limiting support members, the anchor grooves, and the anchor holes.

[0016] The beneficial effect of the annular prestressed tensioning anchor construction method provided by the present invention is that compared with the prior art, the annular prestressed tensioning anchor construction method of the present invention is constructed based on the above-mentioned annular prestressed tensioning anchor system, and the anchor groove on the anchor seat is anchored with one end of the high-strength mesh cloth, and the anchor hole is anchored with the other end of the high-strength mesh cloth through an adhesive, and at the same time, the anchor seat is at least partially pressed into the slurry layer, and there is no need to drill holes and plant reinforcement during construction. It is only necessary to connect the tensioning component to the anchor seat to apply annular tensioning force to the high-strength mesh cloth, so that the high-strength mesh cloth is in a tensioned state and wait for the slurry layer and the adhesive layer to solidify, so that the tensioning end of the high-strength mesh cloth is completely fixed to the anchor hole, forming an annular prestressed tensioning anchor system in which the high-strength mesh cloth is wrapped in the solidified slurry layer, and finally the tensioning component is removed and reused, which can not only avoid the damage to the original structure of the structure caused by drilling and planting reinforcement, and improve the annular prestressed tensioning reinforcement effect, but also can realize the reuse of the tensioning component and save material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a hoop prestressed tension anchoring system provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional view of the annular prestressed tension anchoring system at the anchor seat provided by an embodiment of the present invention; Figure 3 A schematic diagram of the three-dimensional structure of the anchor seat and the tensioning assembly used in the embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the anchor seat used in the embodiment of the present invention from an axial perspective; Figure 5 A schematic diagram of the anchoring state of the high-strength mesh cloth and the anchor seat used in an embodiment of the present invention; Figure 6 A schematic diagram of a bottom view of a bottom plate used in an embodiment of the present invention; Figure 7 A schematic diagram of a bottom plate used in an embodiment of the present invention from a top perspective; Figure 8 A schematic diagram of a cover plate used in an embodiment of the present invention from a bottom perspective; Fig. 9 A schematic diagram of a bottom view of a gland used in an embodiment of the present invention; Fig.10 A schematic diagram of a tension anchor plate used in an embodiment of the present invention from a top perspective; Fig.11 It is a schematic diagram of the three-dimensional structure of the thrust frame used in the embodiment of the present invention.

[0018] In the figure: 10, beam-column structure; 20, slurry layer; 30, high-strength mesh cloth; 301, first end; 302, second end; 31, limit plate; 40, anchor seat; 401, anchor groove; 4011, first groove body; 4012, second groove body; 4013, limit surface; 402, anchor hole; 403, transverse wave surface; 404, longitudinal wave surface; 41, bottom plate; 411, first groove; 42, cover plate; 421, second groove; 50, limit support member; 51, support surface; 60, tensioning assembly; 61, thrust frame; 611, socket; 62, tensioning anchor; 621, tensioning anchor plate; 6211, ear seat; 6212, pressure-maintaining screw; 622, pressure cover; 6221, limit groove; 63, push member. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that when an element is referred to as being "disposed on" or "connected to" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "longitudinal", "horizontal", "upper", "lower", "front", "back", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meanings of "multiple" and "several" are two or more, unless otherwise clearly and specifically defined.

[0021] Please also read Figures 1 to 11, the hoop prestressed tension anchoring system provided by the present invention is now described. The hoop prestressed tension anchoring system is suitable for hoop tension reinforcement of the beam-column structure 10 of the structure, and includes a slurry layer 20 sprayed on the surface of the beam-column structure 10, a high-strength mesh cloth 30 surrounding the beam-column structure 10 and wrapped in the slurry layer 20, and an anchor seat 40 at least partially embedded in the slurry layer 20; the anchor seat 40 is provided with an anchor groove 401 on the side facing the beam-column structure 10, and an anchor hole 402 is provided through the middle part of the anchor seat 40 in the thickness direction; wherein one end of the high-strength mesh cloth 30 is anchored in the anchor groove 401, and the other end is anchored in the anchor hole 402, and a hoop tension force is applied to the high-strength mesh cloth 30.

[0022] It should be noted that one end of the high-strength mesh cloth 30 and the anchor groove 401 can be mechanically anchored, such as by pasting the limiting plate 31 and clamping it with the step structure serving as the limiting surface 4013 in the anchor groove 401 along the tensioning direction; it can also be anchored to the anchor groove 401 by chemical anchoring, such as by bonding and anchoring with a high-strength adhesive; of course, it can also be a combination of mechanical anchoring and chemical anchoring; the anchor hole opened on the anchor seat is not limited to the absolute middle position in the thickness direction, and the anchor hole can be set biased towards one of the wall surfaces of the anchor seat according to actual needs and the strength of the anchor seat.

[0023] The other end of the high-strength mesh cloth 30 and the anchor hole 402 can be connected by mechanical anchoring, for example, the anchor hole 402 is designed as a wedge-shaped hole, and the high-strength mesh cloth 30 is clamped by inserting a wedge-shaped anchor plate into the anchor hole 402; or chemical anchoring can be used, specifically, the two sides of the high-strength mesh cloth 30 can be bonded and anchored to the two side walls of the anchor hole 402 respectively; of course, a combination of mechanical anchoring and chemical anchoring can also be used.

[0024] It should be understood that when performing circumferential prestressed tensioning and anchoring construction, one end of the high-strength mesh cloth 30 should be anchored in the anchor groove 401 first, and then the high-strength mesh cloth 30 should be passed through the anchor hole 402 to connect with the output end of the tensioning assembly 60 after it wraps around the beam-column structure 10 for one week. At this time, the high-strength mesh cloth 30 is still in a movable state in the anchor hole 402. After the tensioning assembly 60 applies circumferential tensioning force to the high-strength mesh cloth 30, the high-strength mesh cloth 30 is anchored to the anchor hole 402. If a chemical anchor is used, the adhesive can be pre-coated on the inner wall of the anchor hole 402 and on both sides of the high-strength mesh cloth 30 before the high-strength mesh cloth 30 passes through the anchor hole 402. After the tensioning is completed, just wait for the adhesive to solidify. If a mechanical anchor is used, anchoring should be performed after the tensioning is completed.

[0025] After the tensioning assembly 60 maintains the circumferential tensioning force on the high-strength mesh cloth 30 until the slurry layer 20 and the adhesive are completely cured, the tensioning assembly 60 can be removed, leaving only the high-strength mesh cloth 30 wrapped in the slurry layer 20 and the anchor seat 40 connected to the beam-column structure 10 as a whole.

[0026] It should be explained that a threaded hole for connecting the tensioning assembly 60 may be provided on the above-mentioned anchor seat 40, that is, the anchor seat 40 has the function of a tensioning end support during the construction process, which can not only realize drilling-free construction, but also realize the reuse of the tensioning assembly 60.

[0027] The slurry layer 20 may be a polymer mortar with a thickness of 10 to 15 mm sprayed on the surface of the area of ​​the beam-column structure 10 that needs to be reinforced; the high-strength mesh cloth 30 may be a steel mesh cloth, that is, a structure in which warp steel wire bundles are arranged at intervals on the fiber mesh cloth, and the warp steel wire bundles are used to ensure sufficient circumferential tension value.

[0028] Compared with the prior art, the annular prestressed tensioning anchoring system provided in the present embodiment utilizes the anchor groove 401 on the anchor seat 40 to anchor one end of the high-strength mesh cloth 30, and the anchor hole 402 to anchor the other end of the high-strength mesh cloth 30, while making the anchor seat 40 at least partially pressed into the slurry layer 20. During construction, there is no need to drill holes and plant reinforcement. It is only necessary to connect the tensioning assembly 60 to the anchor seat 40 to apply annular tensioning force to the high-strength mesh cloth 30, so that the high-strength mesh cloth 30 is in a tensioned state and the tensioning assembly 60 can be removed after the slurry layer 20 is cured, thereby forming an annular prestressed tensioning anchoring system in which the high-strength mesh cloth 30 is wrapped in the cured slurry layer 20. This can avoid damage to the original structure of the structure caused by drilling holes and planting reinforcement, and improve the annular prestressed tensioning reinforcement effect.

[0029] In some embodiments, see Figures 3 to 8 The anchor seat 40 includes a bottom plate 41 and a cover plate 42; the bottom plate 41 is embedded in the slurry layer 20 and is provided with an anchor groove 401, and the plate surface of the bottom plate 41 facing away from the beam-column structure 10 is provided with a first groove 411; the cover plate 42 is detachably connected to the bottom plate 41, and the plate surface of the cover plate 42 facing the bottom plate 41 is provided with a second groove 421, the second groove 421 and the first groove 411 are buckled to form an anchor hole 402 and cooperate to clamp the high-strength mesh cloth 30, and the high-strength mesh cloth 30 is bonded to the anchor hole 402.

[0030] Threaded holes can be set at the positions of the base plate 41 on both sides of the anchor groove 401, and bolts connected to the threaded holes are passed through the cover plate 42 to realize the detachable connection and fixation of the cover plate 42 and the base plate 41; thereby, it is convenient to apply adhesive to the first groove 411 and the second groove 421 during the construction process, and it is also possible to install the cover plate 42 after the high-strength mesh cloth 30 passes through the first groove 411, so that the second groove 421 and the first groove 411 form a clamping force on the high-strength mesh cloth 30, and after the adhesive is cured, the anchoring strength of the high-strength mesh cloth 30 and the anchor hole 402 can be improved.

[0031] For some examples, see Figure 2A limiting piece 31 is provided at one end of the high-strength mesh cloth 30, and the anchor groove 401 includes a first groove body 4011 and a second groove body 4012. The depth of the first groove body 4011 is greater than that of the second groove body 4012, and a limiting surface 4013 is formed between the two; wherein the limiting piece 31 is embedded in the first groove body 4011 and abuts against the limiting surface 4013 along the tensioning direction, and the high-strength mesh cloth 30 passes through the bottom plate 41 from the second groove body 4012 and extends around the beam-column structure 10 to the anchor hole 402.

[0032] The limiting piece 31 can specifically be an aluminum sheet. The limiting piece 31 can be fixed to the end of the high-strength mesh cloth 30 by epoxy paste adhesive, and then embedded in the deeper first groove body 4011. The limiting surface 4013 formed at the junction of the first groove body 4011 and the second groove body 4012 is used to form an abutment limit for the limiting piece 31, thereby avoiding the problem of the high-strength mesh cloth 30 being unanchored in the anchor groove 401 during tension loading; specifically, the thickness of the high-strength mesh cloth 30 itself does not exceed 1 mm, and the thickness of the end of the high-strength mesh cloth 30 after the limiting piece 31 is bonded is about 2 mm. Accordingly, the depth of the first groove body 4011 is set to 2 mm, and the depth of the second groove body 4012 is set to 1 mm, thereby achieving reliable fixation of the limiting piece 31 in the first groove body 4011, and at the same time, the second groove body 4012 is used to enable the high-strength mesh cloth 30 to pass through the anchor seat 40, thereby avoiding the high-strength mesh cloth 30 from being subjected to shear force and affecting its tension bearing capacity.

[0033] It should be understood that during the tensioning construction, the anchor seat 40 can be used as an installation base to connect the tensioning assembly 60, and the main body of the tensioning assembly 60 is located on the side of the anchor seat 40. After the high-strength mesh cloth 30 passes through the end of the anchor hole 402 and is connected to the tensioning assembly 60, the tensioning assembly 60 is used to apply tensioning force to the high-strength mesh cloth 30. As a result, the high-strength mesh cloth 30 is fixed to the end of the first groove body 4011 by the limiting plate 31 as a fixed end, and the high-strength mesh cloth is connected to the end of the tensioning assembly 60 as a tensioning end; specifically, the limiting surface 4013 is set close to the tensioning assembly 60 inside the anchor groove 401, that is, the length of the first groove body 4011 along the tensioning direction is greater than that of the second groove body 4012, thereby ensuring the anchoring area of ​​the limiting plate 31 in the first groove body 4011, and utilizing the limiting surface 4013 to abut against the limiting plate 31 to improve the anchoring reliability of the fixed end.

[0034] For some possible implementations, see Figures 4 to 8 The bottoms of the first groove body 4011 and the second groove body 4012 are respectively used to support and constrain the cross-section of one end of the limit plate 31 and the high-strength mesh cloth 30 into a transverse wave surface 403; the first groove 411 and the second groove 421 are used to cooperate in clamping and constraining the cross-section of the other end of the high-strength mesh cloth 30 into a transverse wave surface 403.

[0035] When the width of the area to be reinforced of the beam-column structure 10 is determined, in order to increase its hoop tension force, it is necessary to improve the tensile performance of the high-strength mesh cloth 30. The tensile performance of the high-strength mesh cloth 30 depends on the strength and number of its warp threads. For example, for a steel wire mesh cloth, the more and denser the warp steel wire bundles are or the larger the diameter is at the same width, the higher its tensile load capacity is. However, if the warp steel wire bundles are too dense or the diameter is increased, the spacing between them will decrease, thereby causing the bonding strength between the warp steel wire bundles and the slurry layer 20 to decrease. Therefore, the expected tension reinforcement effect cannot be guaranteed. One end of the high-strength mesh cloth 30 is supported and constrained by the first trough body 4011 and the second trough body 4012, and the high-strength mesh cloth 30 is clamped and constrained by the first groove 411 and the second groove 421, so that the cross-section of the high-strength mesh cloth 30 forms a transverse wave surface 403. In this way, the number or diameter of the warps of the high-strength mesh cloth 30 can be increased without affecting the warp spacing of the high-strength mesh cloth 30 while keeping the tensioning construction width unchanged, thereby improving the overall tensile load capacity of the high-strength mesh cloth 30, thereby meeting the needs of circumferential high prestressed tensioning reinforcement.

[0036] It should be noted that if Figure 1 As shown, the annular prestressed tensioning anchoring system also includes a plurality of limiting supports 50 distributed at intervals along the annular direction of the beam-column structure 10; the limiting supports 50 have a supporting curved surface 51 for supporting the high-strength mesh cloth 30, and the supporting curved surfaces 51 of each limiting support 50 jointly support the high-strength mesh cloth 30 to form a transverse wave curved surface 403.

[0037] On the basis of forming transverse wave surfaces 403 at both ends of the high-strength mesh cloth 30, the support surface 51 of the limiting support member 50 is used to provide interval support for other parts of the high-strength mesh cloth 30 surrounding the beam-column structure 10, thereby ensuring that the cross-section of the high-strength mesh cloth 30 at any position is a consistent transverse wave surface 403, thereby improving the bonding strength between the high-strength mesh cloth 30 and the slurry layer 20, thereby improving the circumferential high prestressed tensioning reinforcement effect.

[0038] Specifically, for the prismatic beam-column structure 10, a limiting support member 50 can be fastened at each edge position, and at the same time, depending on the distance between adjacent edges, a limiting support member 50 can be adaptively set on the wall surface between the two (generally not required); for cylindrical, elliptical or other cylindrical beam-column structures 10, since they have no edge corners, the setting position of the limiting support member 50 does not need to be strictly determined at a certain position, and it is only necessary to arrange a number of them evenly spaced along the circumference of the beam-column structure 10 to ensure the transverse wave surface 403 of the high-strength mesh cloth 30.

[0039] In order to improve the anchoring reliability between the high-strength mesh cloth 30 and the anchor hole 402 and avoid the problem of unanchoring after the tensioning assembly 60 is removed, as shown in FIG. Figure 4As shown, the bottoms of the first groove 411 and the second groove 421 are formed along the tensioning direction with longitudinal wave curved surfaces 404. The high-strength mesh cloth 30 can be clamped into a corresponding curved surface shape by using the longitudinal wave curved surface 404. Compared with the straight clamping method, it can not only increase the clamping area and bonding area of ​​the high-strength mesh cloth 30, but also the curved surface structure has better anti-slip performance than the straight structure, thereby meeting the application requirements of circumferential high prestressed tension reinforcement.

[0040] In addition, the transverse wave surface 403 formed by the first groove 411 and the second groove 421 on the high-strength mesh cloth 30 can not only increase the number or diameter of the warp threads of the high-strength mesh cloth 30, but also increase the clamping area of ​​the first groove 411 and the second groove 421 on the high-strength mesh cloth 30, thereby further improving the anchoring strength of the high-strength mesh cloth 30 in the anchor hole 402.

[0041] It is important to understand that see Figures 1 to 3 The above-mentioned circumferential prestressed tensioning anchoring system also includes a tensioning assembly 60, which is detachably connected to the anchor seat 40, and one end of the high-strength mesh cloth 30 passes through the anchor hole 402 and is connected to the output end of the tensioning assembly 60; wherein the tensioning assembly 60 is used to apply circumferential tensioning force to the high-strength mesh cloth 30.

[0042] During the tensioning reinforcement construction, the tensioning assembly 60 is installed on the anchor seat 40, and a tensioning force is applied to the end of the high-strength mesh cloth 30 passing through the anchor hole 402 (at this time, the high-strength mesh cloth 30 is not yet completely anchored between the anchor hole 402, and the high-strength mesh cloth 30 and the anchor groove 401 are completely anchored), so that the high-strength mesh cloth 30 obtains annular tensioning prestress. After the slurry layer 20 is cured and the high-strength mesh cloth 30 is completely anchored in the anchor hole 402 (the adhesive is completely cured in the case of chemical anchors), the tensioning assembly 60 can be removed, thereby realizing the reuse of the tensioning assembly 60.

[0043] As a specific implementation of the tensioning assembly 60, please refer to Figure 3 , Figures 9 to 11The tensioning assembly 60 includes a thrust frame 61, a tensioning anchor plate 621, a pressure cover 622, and a thrust piece 63; wherein the thrust frame 61 is detachably connected to the side of the anchor seat 40 away from the beam-column structure 10, and the thrust frame 61 has two jacks 611 spaced apart along the width direction of the high-strength mesh cloth 30; the tensioning anchor plate 621 is located on the side of the anchor seat 40 and is provided with two ear seats 6211, and the two ear seats 6211 are respectively provided with pressure-maintaining screws 6212, and the pressure-maintaining screws The rod 6212 is threadedly matched with the ear seat 6211, and the two pressure-maintaining screws 6212 are respectively inserted into the socket 611 along the tensioning direction and rotated with the socket 611; the pressure cover 622 is detachably connected to the tensioning anchor plate 621, and cooperates with the tensioning anchor plate 621 to anchor the end of the high-strength mesh cloth 30 passing through the anchor hole 402, and a limiting groove 6221 is provided in the center of the pressure cover 622; the pushing member 63 is arranged between the thrust frame 61 and the limiting groove 6221 and outputs the pushing force.

[0044] In the case where the anchor seat 40 is detachable based on the cover plate 42 and the base plate 41, one end of the high-strength mesh cloth 30 can be clamped between the tensioning anchor plate 621 and the pressure cover 622 in advance, thereby improving the construction efficiency. Alternatively, the high-strength mesh cloth 30 can be clamped between the tensioning anchor plate 621 and the pressure cover 622 after passing through the anchor hole 402. The tensioning anchor plate 621 and the pressure cover 622 can be fixedly connected by a number of bolts to form a clamping effect on the high-strength mesh cloth 30. On this basis, an interface agent can be applied on the clamping surface of the tensioning anchor plate 621 and the pressure cover 622, and then a dipped fiber cloth can be affixed. The dipped fiber cloth is used to realize chemical bonding and anchoring of the high-strength mesh cloth 30 on the basis of clamping and fixing. Since the interface agent is applied, the tensioning anchor plate 621 and the pressure cover 622 can be separated from the high-strength mesh cloth 30 smoothly after the construction is completed, thereby meeting the reuse requirements of the tensioning anchor plate 621 and the pressure cover 622.

[0045] After the high-strength mesh cloth 30 is anchored between the tension anchor plate 621 and the pressure cover 622, the two pressure-maintaining screws 6212 are inserted into the sockets 611 on the thrust frame 61, and then the pressure-maintaining screws 6212 can be screwed with an electric wrench, and the threaded cooperation between the pressure-maintaining screws 6212 and the ear seat 6211 can be used to drive the tension anchor plate 621 away from the anchor seat 40, so that the high-strength mesh cloth 30 is tightened and hooped on the beam-column structure 10, and then the push piece 63 is placed between the thrust frame 61 and the pressure cover 622, and the limit groove 6221 on the pressure cover 622 is used to ensure that the push piece 63 is The point of action of 3 is located at the center of the pressure cover 622, thereby ensuring that the high-strength mesh cloth 30 is evenly stressed in the width direction. During the process of the pushing member 63 applying the pushing force, the pressure-maintaining screw 6212 is pulled outward in the insertion hole 611. When the circumferential tensioning force applied to the high-strength mesh cloth 30 reaches the requirement, the pressure-maintaining screw 6212 is re-tightened to make it tight in the insertion hole 611, and then the pushing member 63 can be removed. This can avoid long-term load on the pushing member 63 while waiting for the slurry layer 20 to solidify, and can also avoid the situation where the tensioning failure caused by the failure of the pushing member 63.

[0046] It should be understood that in order to ensure that the high-strength mesh cloth 30 is evenly stressed over the entire width during tensioning, Fig. 9 and Fig.10 As shown, the surfaces of the tensioning anchor plate 621 and the pressure cover 622 used to clamp the high-strength mesh cloth 30 are consistent with the shape of the above-mentioned transverse wave surface 403. At the same time, in order to improve the tensile performance of the tensioning anchor plate 621 and the pressure cover 622 after anchoring the high-strength mesh cloth 30, the surfaces of the tensioning anchor plate 621 and the pressure cover 622 used to clamp the high-strength mesh cloth 30 also form a surface that is the same as or similar to the above-mentioned longitudinal wave surface 404 along the tensioning direction.

[0047] Based on the same inventive concept, Figures 1 to 11 It is understood that the embodiment of the present application also provides a circumferential prestressed tensioning anchoring construction method, which adopts the above-mentioned circumferential prestressed tensioning anchoring system, including: Step S100, after determining the length of the high-strength mesh cloth 30, a limiting piece 31 is pasted to the first end 301 thereof. Specifically, the length of the high-strength mesh cloth 30 is determined according to the circumferential dimension of the beam-column structure 10 to be reinforced, and the limiting piece 31 is pasted to the first end 301 of the high-strength mesh cloth 30; the length of the high-strength mesh cloth 30 needs to be greater than the circumferential dimension of the beam-column structure 10 to ensure the anchoring amount at both ends thereof, the first end 301 of the high-strength mesh cloth 30 is used as the tensioning end, and the limiting piece 31 can be specifically a six-series aluminum sheet, which is pasted on both sides of the first end 301 with epoxy paste.

[0048] Step S200, after cleaning the circumferential base surface of the beam-column structure 10 where reinforcement is required, spray the slurry layer 20 and arrange the limit support 50. Specifically, firstly, the loose concrete layer on the surface of the beam-column structure 10 is polished and removed, and then the protruding position of the area to be reinforced is polished and leveled, and the concave position is repaired and leveled. If the beam-column structure 10 is a steel component, only the rust on its surface needs to be polished; after the base surface is cleaned, the slurry layer 20 is sprayed. The slurry layer 20 can be a wet spray polymer mortar. The thickness of the slurry layer 20 is controlled to be 10-15mm. After the spraying is completed, the limit support 50 is installed by using the bonding force of the slurry layer 20; Among them, if the beam-column structure 10 is a prismatic shape, a limiting support member 50 is arranged at least on each edge position thereof; if the beam body structure is cylindrical or quasi-cylindrical, a plurality of limiting support members 50 are evenly arranged along its circumference, and the supporting effect of the limiting support members 50 on the high-strength mesh cloth 30 is utilized to ensure that there is a gap between the high-strength mesh cloth 30 and the surface of the beam-column structure 10, thereby ensuring that the high-strength mesh cloth 30 can be completely wrapped in the slurry layer 20, thereby improving the bonding strength between the high-strength mesh cloth 30 and the slurry layer 20.

[0049] In step S300, the first end 301 with the limiting plate 31 pasted thereon is embedded in the anchor groove 401 and fixed, so that the high-strength mesh cloth 30 surrounds the beam-column structure 10 and is supported on each limiting support member 50, and then the second end 302 of the high-strength mesh cloth 30 is passed through the anchor hole 402 and anchored between the tensioning anchor plate 621 and the pressure cover 622 of the tensioning anchor 62.

[0050] Specifically, the anchor seat 40 includes a bottom plate 41 and a cover plate 42 that are detachably connected by fasteners such as bolts; the anchor groove 401 is set on one side of the bottom plate 41 and the anchor groove 401 is divided into two areas with different depths, the deeper area is used as a first groove body 4011, and the shallower area is used as a second groove body 4012. The part where the second groove body 4012 and the first groove body 4011 are connected forms a step surface, and the step surface is used as a limiting surface 4013; the other side of the bottom plate 41 is provided with a first groove 411, and the cover plate 42 is provided with a second groove 421 on the plate surface facing the bottom plate 41, and the cover plate 4 2 is provided with a threaded hole for installing the thrust frame 61, and after the cover plate 42 is buckled on the bottom plate 41, the second groove 421 and the first groove 411 cooperate to form an anchor hole 402; the tension anchor plate 621 and the pressure cover 622 are detachably connected by fasteners such as bolts, and a pressure retaining screw 6212 is provided on the tension anchor plate 621 or the pressure cover 622; the tension anchor plate 621 and the pressure cover 622 are respectively provided with embedded grooves on the plate surfaces close to each other, and when the pressure cover 622 and the tension anchor plate 621 are fixed, the embedded grooves of the two are buckled with each other to anchor the second end 302 (as the tensioning end) of the high-strength mesh cloth 30.

[0051] Based on the above structure, the limiting piece 31 is embedded in the first groove body 4011 and abuts against the limiting surface 4013, so that the first end 301 is clamped in the first groove body 4011 along the tensioning direction, and the second groove body 4012 is used for the high-strength mesh cloth 30 to pass through, so as to prevent the high-strength mesh cloth 30 from being subjected to shear force and affecting its tensile strength. Of course, the limiting piece 31 and the first groove body 4011 can be fixed by bonding with an adhesive, or can be simply abutted by the limiting surface 4013 without bonding to achieve tensile resistance and anti-detachment; In order to improve the construction efficiency, the second end 302 of the high-strength mesh cloth 30 can be anchored to the tension anchor 62 first. The specific anchoring method can be to apply an interface agent in the two grooves respectively and lay a high-performance fiber cloth impregnated with glue, and then the second end 302 is clamped between the two grooves and the pressure cover 622 and the tension anchor plate 621 are tightened. After the glue impregnated with the high-performance fiber cloth is cured, the anchoring of the second end 302 can be achieved. While waiting for the glue to cure, the waiting time can be used to perform other steps simultaneously; of course, this step can also be performed after the high-strength mesh cloth 30 surrounds the beam-column structure 10 and passes through the anchor hole 402, and there is no need to limit the order of sequence.

[0052] After the first end 301 is fixed in the anchor groove 401, the bottom plate 41 is pressed into the slurry layer 20, and then the high-strength mesh cloth 30 is embedded in the first groove 411 after being wrapped around the beam-column structure 10 for one circle, and an adhesive (specifically, it can be a special glue for high-strength steel wire mesh cloth) is applied in advance in the first groove 411 and the second groove 421, and the second end 302 is extended out of the first groove 411, and then the cover plate 42 is installed on the bottom plate 41, so that the second groove 421 and the first groove 411 form a certain clamping force on the high-strength mesh cloth 30, and at this time, the high-strength mesh cloth 30 forms a loose state around the beam-column structure 10.

[0053] Step S400, installing the thrust frame 61 on the anchor seat 40, and connecting the tension anchor 62 to the thrust frame 61, applying a top thrust between the anchor seat 40 and the tension anchor 62 through the pressure-maintaining screw 6212, so that the high-strength mesh cloth 30 tightens the beam-column structure 10. Specifically, the thrust frame 61 is connected to the threaded hole on the cover plate 42 by fasteners such as bolts. This step can also be performed before the high-strength mesh cloth 30 is used to encircle the beam-column structure 10. After the thrust frame 61 is installed and the second end 302 is anchored with the tension anchor 62, the pressure-maintaining screw 6212 is plugged into the socket 611 on the thrust frame 61, so that the tension anchor 62 is connected to the anchor seat 40. At this time, the pressure-maintaining screw 6212 can be screwed manually or with an electric wrench to allow the tension anchor 62 to obtain a top thrust and move away from the anchor seat 40, thereby gradually tightening the high-strength mesh cloth 30 from a loose state. After tightening, the high-strength mesh cloth 30 and the anchor seat 40 can be stabilized on the beam-column structure 10 without the aid of external force, thereby freeing up construction personnel for subsequent operations.

[0054] Step S500, install the push piece 63 between the thrust frame 61 and the tension anchor 62 and output the push force, so that the high-strength mesh cloth 30 obtains the circumferential tension force. Specifically, it is recommended to use a hydraulic jack, which is directly placed between the thrust frame 61 and the tension anchor 62, and then output the push force to gradually move the tension anchor 62 away from the anchor seat 40 (at this time, the adhesive coated in the first groove 411 and the second groove 421 has not been completely cured, and the high-strength mesh cloth 30 can move in the anchor hole 402), so as to apply the circumferential tension force that meets the requirements on the high-strength mesh cloth 30; in order to ensure that the high-strength mesh cloth 30 is evenly stressed within its width, it should be ensured that the push piece 63 acts on the center of the tension anchor 62. Of course, a limit groove 6221 can be set on the tension anchor 62 to limit the installation of the push piece 63.

[0055] After the high-strength mesh cloth 30 obtains the required circumferential tensioning force, the pressure-maintaining screw 6212 is screwed again (the pressure-maintaining screw 6212 gradually slides out of the insertion hole 611 of the thrust frame 61 during the pushing process of the pushing member 63, and is screwed again to reinsert the pressure-maintaining screw 6212 until it abuts against the bottom of the insertion hole 611). The pressure-maintaining screw 6212 is used to establish effective support between the thrust frame 61 and the tensioning anchor 62, and then the pushing member 63 can be released. Of course, in order to ensure stability, the pushing state of the pushing member 63 can also be maintained.

[0056] Step S600, after the slurry layer 20 is cured, the push piece 63, the tension anchor 62 and the thrust frame 61 are removed. It should be explained that when the slurry layer 20 is cured, it should be determined whether the adhesive in the first groove 411 and the second groove 421 is completely cured, and the push piece 63 and the tension anchor 62 can be removed only after it is determined that the adhesive is completely cured, so as to avoid the risk of unanchoring.

[0057] It should be noted that the above steps S100 to S500 are not limited to a specific construction sequence. The order of the steps can be changed based on the actual construction situation, and can also be carried out in a cross-synchronous manner. The construction is highly flexible and is conducive to improving construction efficiency.

[0058] Compared with the prior art, the annular prestressed tension anchoring construction method provided by the present invention is constructed based on the annular prestressed tension anchoring system, using the anchor groove 401 on the anchor seat 40 to anchor one end of the high-strength mesh cloth 30, and the anchor hole 402 to anchor the other end of the high-strength mesh cloth 30 through an adhesive, while making the anchor seat 40 at least partially pressed into the slurry layer 20. During construction, there is no need to drill holes and plant reinforcement. It is only necessary to connect the tensioning assembly 60 to the anchor seat 40 to apply an annular tensioning force to the high-strength mesh cloth 30. The high-strength mesh cloth 30 is in a tensioned state while waiting for the slurry layer 20 and the bonding layer to solidify, so that the tensioned end of the high-strength mesh cloth 30 is completely fixed to the anchor hole 402, forming a circumferential prestressed tensioning anchoring system in which the high-strength mesh cloth 30 is wrapped in the solidified slurry layer 20. Finally, the tensioning assembly 60 is removed and reused, which can not only avoid the damage to the original structure of the structure caused by drilling and planting reinforcement, improve the circumferential prestressed tensioning reinforcement effect, but also realize the reuse of the tensioning assembly 60 and save material costs.

[0059] Some possible implementations include Figure 4 and Figure 5 As shown, the high-strength mesh cloth 30 forms a transverse wave surface 403 along its width direction based on the common limiting constraints of the limiting support member 50, the anchor groove 401, and the anchor hole 402.

[0060] It should be noted that the first end 301 of the high-strength mesh cloth 30 is supported and constrained by the bottom support of the anchor groove 401, the second end 302 is clamped and constrained by the bottom clamping of the first groove 411 and the second groove 421, and the other parts surrounding the beam-column structure 10 are also supported and constrained by the limiting support 50. Therefore, the bottom of the anchor groove 401, the supporting surface of the limiting support 50, and the bottom of the first groove 411 and the second groove 421 can be set as a transverse wave surface 403. Of course, the tensioning component 62 should adopt the above-mentioned transverse wave surface 403 structure for the tensioning end anchoring of the high-strength mesh cloth, so that the high-strength mesh cloth 30 as a whole forms a transverse wave surface 403 in its width direction. In this way, the number or diameter of the warps of the high-strength mesh cloth 30 can be increased without changing the tensioning construction width and affecting the warp spacing of the high-strength mesh cloth 30, thereby improving the overall tensile load capacity of the high-strength mesh cloth 30, improving the circumferential tensioning strength of the beam-column structure 10, and thereby improving the circumferential prestressed tensioning reinforcement effect.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The hoop prestressed tension anchor system is characterized by: Suitable for circumferential tension reinforcement of beam-column structures of structures, comprising a slurry layer sprayed on the surface of the beam-column structure, a high-strength mesh cloth surrounding the beam-column structure and wrapped in the slurry layer, and an anchor seat at least partially embedded in the slurry layer; An anchor groove is provided on the side of the anchor seat facing the beam-column structure, and an anchor hole is provided through the middle part of the anchor seat in the thickness direction; wherein one end of the high-strength mesh cloth is anchored in the anchor groove, and the other end is anchored in the anchor hole, and a circumferential tension force is applied to the high-strength mesh cloth.

2. The hoop prestressed tension anchor system according to claim 1, characterized in that: The anchor seat includes a base plate and a cover plate; the base plate is embedded in the slurry layer and is provided with the anchor groove, and the base plate surface facing away from the beam-column structure is provided with a first groove; the cover plate is detachably connected to the base plate, and the cover plate surface facing the base plate is provided with a second groove, the second groove and the first groove are buckled to form the anchor hole and cooperate to clamp the high-strength mesh cloth, and the high-strength mesh cloth is bonded to the anchor hole.

3. The hoop prestressed tension anchoring system according to claim 2, characterized in that: A limiting plate is provided at one end of the high-strength mesh cloth, and the anchor groove includes a first groove body and a second groove body, the depth of the first groove body is greater than that of the second groove body, and a limiting surface is formed between the two; wherein, the limiting plate is embedded in the first groove body and abuts against the limiting surface along the tensioning direction, and the high-strength mesh cloth passes through the second groove body, out of the bottom plate, surrounds the beam-column structure and extends to the anchor hole.

4. The hoop prestressed tension anchoring system according to claim 3, characterized in that: The bottoms of the first and second grooves are respectively used to support and constrain the cross-section of one end of the limit plate and the high-strength mesh cloth into a transverse wave surface; the first groove and the second groove are used to cooperate to clamp and constrain the cross-section of the other end of the high-strength mesh cloth into the transverse wave surface.

5. The hoop prestressed tension anchoring system according to claim 4, characterized in that: The annular prestressed tensioning anchoring system also includes a plurality of limiting supports distributed at intervals along the annular direction of the beam-column structure; the limiting supports have a supporting curved surface for supporting the high-strength mesh cloth, and the supporting curved surfaces of each of the limiting supports jointly support the high-strength mesh cloth into the transverse wave curved surface.

6. The hoop prestressed tension anchoring system according to claim 4, characterized in that: The groove bottoms of the first groove and the second groove both form longitudinal wave curved surfaces along the tensioning direction.

7. The hoop prestressed tension anchoring system according to any one of claims 1 to 6, characterized in that: The circumferential prestressed tensioning anchoring system also includes a tensioning assembly, which is detachably connected to the anchor seat, and one end of the high-strength mesh cloth passes through the anchor hole and is connected to the output end of the tensioning assembly; wherein the tensioning assembly is used to apply the circumferential tensioning force to the high-strength mesh cloth.

8. The hoop prestressed tension anchoring system according to claim 7, characterized in that: The tensioning assembly comprises: A thrust frame, detachably connected to a side of the anchor seat away from the beam-column structure, the thrust frame having two insertion holes spaced apart along the width direction of the high-strength mesh cloth; A tensioning anchor plate is located on the side of the anchor seat and is provided with two ear seats, and the two ear seats are respectively penetrated with a pressure-maintaining screw, the pressure-maintaining screw is threadedly matched with the ear seat, and the two pressure-maintaining screws are respectively inserted into the insertion holes correspondingly along the tensioning direction and are rotationally matched with the insertion holes; A gland is detachably connected to the tension anchor plate and cooperates with the tension anchor plate to anchor the end of the high-strength mesh cloth passing through the anchor hole, and a limiting groove is provided at the center of the gland; The push member is arranged between the thrust frame and the limiting groove and outputs the push force.

9. A method for constructing a circumferential prestressed anchoring structure, characterized in that: The circumferential prestressed tension anchoring system according to any one of claims 1 to 8 comprises: After determining the length of the high-strength mesh cloth, stick a limit piece on its first end; After cleaning the circumferential base surface of the beam-column structure where reinforcement is required, spraying a slurry layer and arranging limit support members; The first end of the limit plate is inserted into the anchor groove for fixing, so that the high-strength mesh cloth surrounds the beam-column structure and is supported on each of the limit support members, and then the second end of the high-strength mesh cloth is passed through the anchor hole and anchored between the tension anchor plate and the gland of the tension anchor; A thrust frame is installed on the anchor seat, and the tension anchor is connected to the thrust frame, and a top thrust is applied between the anchor seat and the tension anchor by a pressure-maintaining screw, so that the high-strength mesh cloth tightens the beam-column structure; A thrust piece is installed between the thrust frame and the tension anchor to output a thrust force, so that the high-strength mesh cloth obtains the circumferential tension force; After the slurry layer is solidified, the jacking member, the tension anchor and the thrust frame are removed.

10. The circumferential prestressed tension anchoring construction method according to claim 9, characterized in that: The high-strength mesh cloth forms a transverse wave surface along its width direction based on the common limiting constraints of the limiting support member, the anchor groove and the anchor hole.

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