Bond-mechanical composite type anchor for FRP bar and anchoring method

Abstract

The application discloses a kind of FRP tendon bonding-mechanical composite type anchorage device and anchoring method, including anchor cylinder (2), clamping piece, tail plug (4), head end cover plate (5) and binder (6);Anchor cylinder inside is formed with through slot (201) and blind groove, through slot axially penetrates anchor cylinder, and one end of blind groove penetrates the head end of anchor cylinder, and blind groove is communicated with through slot;The anchoring end of FRP tendon is inserted in anchor cylinder by through slot, clamping piece is clamped and fixed on the anchoring end of FRP tendon, and clamping piece is matched and embedded in blind groove;Tail plug is embedded in the tail end of through slot in anchor cylinder, FRP tendon penetrates tail plug, head end cover plate is closed and covers in the head end of through slot in anchor cylinder, binder is filled in anchor cylinder, so that the anchoring end of FRP tendon is fixed in anchor cylinder by clamping piece and binder.The application can solve the problems of large specific volume, poor bonding agent pouring quality and limited FRP tendon use in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of civil construction, and particularly relates to a FRP tendon bond-mechanical composite anchor and anchoring method. BACKGROUND

[0002] The fiber reinforced composite material (FRP) tendon is a new type of rod-shaped composite material manufactured by taking synthetic resin as a base material, taking fiber as a reinforcing material and adding a proper amount of auxiliary agent, and through extrusion molding technology and necessary surface treatment. The FRP tendon has the characteristics of light weight, high strength, corrosion resistance and fatigue resistance, and has a broad application prospect in engineering such as building engineering, bridge engineering, ocean engineering and geotechnical engineering. In order to fully exert the excellent mechanical properties of the FRP tendon, it is of great practical significance to develop a high-efficiency anchor suitable for the FRP tendon.

[0003] At present, the FRP tendon anchor of the prior art is mainly a bond-type anchor, and the anchoring mechanism thereof is to balance the external load by means of the chemical cementation force, friction force between the bond medium and the tendon material and the mechanical engagement force caused by the surface form of the tendon material, so as to achieve the purpose of anchoring. In order to achieve sufficient anchoring force, the length of the bond-type anchor needs to be designed to be relatively long, so as to meet the requirement of anchoring strength, resulting in the problem of large volume of the anchor, which limits the application of the anchor in actual engineering. Meanwhile, due to the narrow and long internal space of the bond-type anchor, there are quality problems such as uneven pouring of the bond agent when pouring the bond agent into the bond-type anchor.

[0004] Therefore, it is necessary to provide a FRP tendon bond-mechanical composite anchor and anchoring method, which can solve the problems of large volume of the bond-type anchor, poor pouring quality of the bond agent and limited use of the FRP tendon in the prior art. SUMMARY

[0005] The present application relates to the field of civil construction, and particularly relates to a FRP tendon bond-mechanical composite anchor and anchoring method.

[0006] The present application is implemented in the following manner:

[0007] The present application relates to the field of civil construction, and particularly relates to a FRP tendon bond-mechanical composite anchor and anchoring method. A FRP tendon bond-mechanical composite anchor, comprising an anchor cylinder, a clamping piece, a tail plug, a head cover plate and a bond agent; a through groove and a blind groove are formed in the anchor cylinder, the through groove penetrates the anchor cylinder in the axial direction, one end of the blind groove penetrates the head end of the anchor cylinder, and the blind groove is in communication with the through groove; the anchoring end of the FRP tendon is inserted into the anchor cylinder through the through groove, the clamping piece is clamped and fixed on the anchoring end of the FRP tendon, and the clamping piece is matched and embedded in the blind groove; the tail plug is embedded in the tail end of the through groove in the anchor cylinder, the FRP tendon penetrates the tail plug, the head cover plate covers the head end of the through groove in the anchor cylinder, and the bond agent is filled in the anchor cylinder, so that the anchoring end of the FRP tendon is fixed in the anchor cylinder through the clamping piece and the bond agent.

[0008] The blind slots include first blind slots and second blind slots, and the clamping pieces include first clamping pieces and second clamping pieces, two ends of the first clamping pieces are respectively matched and embedded in a pair of first blind slots, and two ends of the second clamping pieces are respectively matched and embedded in a pair of second blind slots.

[0009] The length direction of the first blind slots and the second blind slots is consistent with the axial direction of the through slot, and the width direction of the first blind slots and the second blind slots is consistent with the radial direction of the through slot.

[0010] The plane in which the pair of first blind slots is located is perpendicular to the plane in which the pair of second blind slots is located, the depth of the first blind slot is less than the depth of the second blind slot, the vertical distance between the blind end of the first blind slot and the blind end of the second blind slot is greater than the height of the second clamping piece, and the depth of the first blind slot is greater than the height of the first clamping piece, so that the first clamping piece and the second clamping piece are vertically staggered and arranged in the anchor barrel.

[0011] The through slot is a tapered structure with a large diameter at the front end and a small diameter at the tail end, and the pair of first blind slots and the pair of second blind slots are respectively and symmetrically arranged at the front end of the through slot, and the tail end diameter of the through slot is greater than the diameter of the FRP bar.

[0012] The first clamping piece and the second clamping piece are the same in structure; the first clamping piece and the second clamping piece each include a hoop, a clamping plate and a connecting piece; a pair of clamping plates are respectively and symmetrically connected at two ends of the hoop in a half circular ring shape, and when the pair of hoops are clamped on the FRP bar, the clamping plates at the two ends are parallel and are locked and fixed by the connecting piece; the clamping plates at the two ends of the hoop are matched and embedded in the through slot.

[0013] The tail plug is a circular ring structure, the outer diameter of the tail plug is consistent with the tail end diameter of the through slot, and the inner diameter of the tail plug is greater than the diameter of the FRP bar.

[0014] The front end cover plate is a circular structure, the diameter of the front end cover plate is consistent with the front end diameter of the through slot; a plurality of protrusions are formed at the edge of the front end cover plate, and the plurality of protrusions are respectively embedded in the blind slots.

[0015] An anchoring method of an FRP bar adhesive-mechanical composite anchor, comprising the following steps:

[0016] Step 1: clamp and fix the clamping piece on the anchoring end of the FRP bar, and the clamping position of the clamping piece corresponds to the position of the blind slot;

[0017] Step 2: pass the FRP bar into the anchor barrel from the front end to the tail end, so that the anchoring end of the FRP bar is located in the through slot, and the clamping piece is matched and embedded in the blind slot;

[0018] Step 3: pass the tail plug through the FRP bar, and plug the tail end of the through slot in the anchor barrel;

[0019] Step 4: inject the adhesive into the through groove from the first end of the anchor cylinder, and cover the first end cover plate after the through groove is filled with the adhesive;

[0020] Step 5: perform the curing treatment on the adhesive, and complete the composite anchoring of the FRP tendon.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The present application is provided with the adhesive, the clamping piece and the blind groove, two pairs of blind grooves provide the embedding and the limiting for the two ends of the two clamping pieces respectively, the FRP tendon anchoring end can be mechanically anchored in the anchor cylinder, the through groove of the anchor cylinder is filled with the adhesive, the composite anchoring mode of the mechanical anchoring and the adhesive anchoring can effectively improve the anchoring effect of the FRP tendon, effectively prevent the FRP tendon from slipping out of the anchor during the pre-tensioning, and simultaneously realize the reduction of the volume of the anchor cylinder, thereby being beneficial to improving the pouring quality of the adhesive.

[0023] 2. The present application is provided with the first clamping piece and the second clamping piece, the first clamping piece and the second clamping piece are vertically clamped and fixed on the FRP tendon and are fixed through the pair of first blind grooves and the pair of second blind grooves, the anchoring force of the FRP tendon anchoring end can be significantly improved, the anchoring length of the FRP tendon can be obviously reduced under the condition of achieving the same anchoring force, and the use range of the FRP tendon is wider. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the first axial sectional view (along the pair of first blind grooves) of the FRP tendon adhesive-mechanical composite anchor of the present application;

[0025] Figure 2 is the second axial sectional view (along the pair of second blind grooves) of the FRP tendon adhesive-mechanical composite anchor of the present application;

[0026] Figure 3 is the structural schematic view of the anchor cylinder in the FRP tendon adhesive-mechanical composite anchor of the present application;

[0027] Figure 4 is the sectional view of one clamping piece in the FRP tendon adhesive-mechanical composite anchor of the present application;

[0028] Figure 5 is the installation schematic view of the clamping piece on the FRP tendon in the FRP tendon adhesive-mechanical composite anchor of the present application;

[0029] Figure 6 is the radial sectional view of the clamping piece on the FRP tendon in the FRP tendon adhesive-mechanical composite anchor of the present application;

[0030] Figure 7 is the structural schematic view of the tail plug in the FRP tendon adhesive-mechanical composite anchor of the present application;

[0031] Figure 8 is the structural diagram of the first end cover plate in the FRP tendon adhesive-mechanical composite anchor of the present application.

[0032] In the figure, 1 is the FRP tendon, 2 is the anchor cylinder, 201 is the through slot, 202 is the first blind slot, 203 is the second blind slot, 301 is the first clamping piece, 302 is the second clamping piece, 303 is the hoop, 304 is the clamping plate, 305 is the connecting piece, 4 is the tail plug, 5 is the first end cover plate, 501 is the protrusion, and 6 is the adhesive. DETAILED DESCRIPTION

[0033] The present application will be further described below in combination with the drawings and specific embodiments.

[0034] Please refer to the drawings Figure 1 and the drawings Figure 2 An FRP tendon adhesive-mechanical composite anchor comprises an anchor cylinder 2, clamping pieces, a tail plug 4, a first end cover plate 5, and an adhesive 6. The anchor cylinder 2 is internally formed with a through slot 201 and blind slots. The through slot 201 axially penetrates the anchor cylinder 2, and one end of the blind slots penetrates the first end of the anchor cylinder 2 and communicates with the through slot 201. The anchoring end of the FRP tendon 1 is inserted into the anchor cylinder 2 through the through slot 201, the clamping pieces are clamped and fixed on the anchoring end of the FRP tendon 1, and the clamping pieces are matched and embedded in the blind slots. The tail plug 4 is embedded in the tail end of the through slot 201 in the anchor cylinder 2, the FRP tendon 1 penetrates the tail plug 4, the first end cover plate 5 closes and covers the first end of the through slot 201 in the anchor cylinder 2, and the adhesive 6 is filled in the anchor cylinder 2, so that the anchoring end of the FRP tendon 1 is fixed in the anchor cylinder 2 through the clamping pieces and the adhesive 6.

[0035] The clamping pieces are clamped and fixed on the anchoring end of the FRP tendon 1, and the clamping pieces are embedded in the blind slots through the open ends of the blind slots, and the blind ends of the blind slots provide the clamping pieces with a support force in the opposite direction of the pre-tensioning force of the FRP tendon 1, thereby playing a mechanical anchoring role for the FRP tendon 1. The through slot 201 is filled with the adhesive 6, the tail end and the first end of the through slot 201 are closed by the tail plug 4 and the first end cover plate 5, thereby preventing the adhesive 6 from leaking out and playing a role of adhesive anchoring for the FRP tendon 1.

[0036] By using the combination of mechanical anchoring and adhesive anchoring, the anchoring effect of the anchoring end of the FRP tendon 1 in the anchor cylinder 2 can be ensured without increasing the length and diameter of the anchor cylinder 2, thereby being conducive to improving the pouring quality of the adhesive 6 in the anchor cylinder 2, reducing the anchoring length of the FRP tendon 1, and expanding the application range of the FRP tendon 1.

[0037] Please refer to the drawings Figure 1 to the drawings Figure 3The blind grooves include a first blind groove 202 and a second blind groove 203, and the clamping pieces include a first clamping piece 301 and a second clamping piece 302, both ends of the first clamping piece 301 are respectively matched and embedded in a pair of first blind grooves 202, and both ends of the second clamping piece 302 are respectively matched and embedded in a pair of second blind grooves 203.

[0038] The number of blind grooves can be adjusted adaptively according to the mechanical anchoring strength requirement, and preferably two pairs of blind grooves, i.e. the first blind groove 202 and the second blind groove 203. The number of clamping pieces is consistent with the number of blind grooves, so that both ends of each clamping piece can be embedded into the blind grooves at the corresponding positions, thereby ensuring the mechanical anchoring strength.

[0039] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 3 The length direction of the first blind groove 202 and the second blind groove 203 is consistent with the axial direction of the through groove 201, and the width direction of the first blind groove 202 and the second blind groove 203 is consistent with the radial direction of the through groove 201.

[0040] The FRP tendon 1 is inserted into the through groove 201, the pre-tensioning direction of the FRP tendon 1 is the axial direction of the through groove 201, and the blind end of the blind groove is used to provide a reaction force for the FRP tendon 1 through the clamping piece, thereby ensuring the mechanical anchoring effect of the FRP tendon 1.

[0041] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 3 , the accompanying drawings Figure 5 and the accompanying drawings Figure 6 The plane where the pair of first blind grooves 202 is located is perpendicular to the plane where the pair of second blind grooves 203 is located, the depth of the first blind groove 202 is smaller than the depth of the second blind groove 203, the vertical distance between the blind end of the first blind groove 202 and the blind end of the second blind groove 203 is greater than the height of the second clamping piece 302, and the depth of the first blind groove 202 is greater than the height of the first clamping piece 301, so that the first clamping piece 301 and the second clamping piece 302 are vertically staggered and arranged in the anchor cylinder 2.

[0042] The first clamping piece 301 and the second clamping piece 302 are arranged perpendicularly through the pair of first blind grooves 202 and the pair of second blind grooves 203, thereby maximizing the stress stability of the anchoring end of the FRP tendon 1 and the mechanical anchoring effect thereof.

[0043] Please refer to the accompanying drawings Figure 1 and the accompanying drawings Figure 2 The through groove 201 has a tapered structure with a large diameter at the front end and a small diameter at the tail end, the pair of first blind grooves 202 and the pair of second blind grooves 203 are respectively and symmetrically arranged at the front end of the through groove 201, and the tail end diameter of the through groove 201 is greater than the diameter of the FRP tendon 1.

[0044] The size of the through slot 201 can be set according to anchoring requirements, and preferably, the inner taper angle of the through slot 201 is not greater than 4°, so as to ensure the arrangement of the anchoring end of the FRP tendon 1 and the clamping piece and the filling of the adhesive 6.

[0045] Please refer to the accompanying drawings Figure 4 The first clamping piece 301 and the second clamping piece 302 are identical in structure; the first clamping piece 301 and the second clamping piece 302 each include a hoop 303, a clamping plate 304, and a connecting piece 305; a pair of clamping plates 304 are respectively and symmetrically connected to the two ends of the semicircular hoop 303, and when the pair of hoops 303 are clamped on the FRP tendon 1, the clamping plates 304 at the two ends are parallel and are locked and fixed by the connecting piece 305; the clamping plates 304 at the two ends of the hoop 303 are matched and embedded in the through slot.

[0046] Preferably, the inner diameter of the hoop 303 is slightly smaller than the diameter of the FRP tendon 1, so as to ensure that the pair of hoops 303 are firmly clamped on the FRP tendon 1 and do not loosen and slip during pre-tensioning of the FRP tendon 1. The clamping plate 304 can be a rectangular plate and be integrally formed with the hoop 303, and a threaded hole is reserved on the clamping plate 304; the connecting piece 305 can be a flat head inner hexagonal bolt, which is used to connect the two clamping plates 304.

[0047] Preferably, the threaded hole on the clamping plate 304 of the first clamping piece 301 is a tapered countersunk threaded hole, and the threaded hole on the clamping plate 304 of the second clamping piece 302 is a straight threaded hole; the length of the flat head inner hexagonal bolt can be determined according to the thickness of the clamping plate 304, so as to facilitate hidden rotation of the flat head inner hexagonal bolt in the two clamping plates 304.

[0048] Please refer to the accompanying drawings Figure 7 The tail plug 4 is in a circular ring structure, the outer diameter of the tail plug 4 is consistent with the tail end diameter of the through slot 201, and the inner diameter of the tail plug 4 is slightly larger than the diameter of the FRP tendon 1.

[0049] Preferably, the inner diameter of the tail plug 4 is not more than 1 mm larger than the diameter of the FRP tendon 1, so as to prevent the adhesive 6 from leaking out from the gap between the inner circle of the tail plug 4 and the FRP tendon 1.

[0050] Please refer to the accompanying drawings Figure 8 The head cover plate 5 is in a circular structure, and the diameter of the head cover plate 5 is consistent with the head end diameter of the through slot 201; a plurality of protrusions 501 are formed at the edge of the head cover plate 5, and the plurality of protrusions 501 are respectively embedded in the blind groove.

[0051] Preferably, the protrusions 501 are arranged at the edge of the head cover plate 5 at intervals of 90°, matching the positions of the pair of first blind grooves 202 and the pair of second blind grooves 203, so that the four protrusions 501 can block the pair of first blind grooves 202 and the pair of second blind grooves 203, ensuring the closure of the head end of the anchor cylinder 2 and preventing the adhesive 6 from leaking out.

[0052] Please refer to the attached drawings Figure 1 to the attached drawings Figure 8 A method for anchoring an FRP tendon adhesive-mechanical composite anchor, comprising the following steps:

[0053] Step 1: clamp and fix the clamping members on the anchoring end of the FRP tendon 1, and the clamping positions of the clamping members correspond to the positions of the blind grooves.

[0054] Specifically, the first clamping member 301 and the second clamping member 302 are clamped on the FRP tendon 1 respectively, and the first clamping member 301 and the second clamping member 302 are arranged vertically staggered, so that the clamping positions of the first clamping member 301 and the second clamping member 302 correspond to the positions of the first blind groove 202 and the second blind groove 203 respectively.

[0055] Step 2: pass the FRP tendon 1 from the head end to the tail end of the anchor cylinder 2, so that the anchoring end of the FRP tendon 1 is located in the through groove 201, and the clamping members are matched and embedded in the blind grooves.

[0056] At this time, the first clamping member 301 is matched and embedded in the first blind groove 202, and the second clamping member 302 is matched and embedded in the second blind groove 203.

[0057] Step 3: pass the tail plug 4 through the FRP tendon 1, and plug the tail end of the through groove 201 in the anchor cylinder 2.

[0058] The inner diameter of the tail plug 4 is slightly larger than the FRP tendon 1, which can ensure that the tail plug 4 is arranged on the FRP tendon 1, and can also prevent the adhesive 6 from leaking out from the gap between the inner circle of the tail plug 4 and the FRP tendon 1.

[0059] Step 4: inject the adhesive 6 into the through groove 201 from the head end of the anchor cylinder 2, and cover the head cover plate 5 after the through groove 201 is filled with the adhesive 6.

[0060] When installing the head cover plate 5, the protrusions 501 of the head cover plate 5 are respectively embedded into the first blind groove 202 and the second blind groove 203, which are used to block the first blind groove 202 and the second blind groove 203, preventing the adhesive 6 from leaking out.

[0061] Step 5: solidify the adhesive 6 to complete the composite anchoring of the FRP tendon 1.

[0062] The above merely preferred embodiments of the present application are not intended to limit the scope of the application, thus, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. An FRP (Fiberglass Reinforced Plastic) bonded-mechanical composite anchor, characterized in that: The system includes an anchor tube (2), a clamping component, a tail plug (4), a head end cover (5), and an adhesive (6). The anchor tube (2) has a through groove (201) and a blind groove inside. The through groove (201) axially penetrates the anchor tube (2), and one end of the blind groove penetrates the head end of the anchor tube (2), and the blind groove is connected to the through groove (201). The anchoring end of the FRP reinforcement (1) is inserted into the anchor tube (2) through the through groove (201), and the clamping component clamps and fixes it to the FRP reinforcement. The anchoring end of the reinforcing bar (1) is fitted with a clamping device that is matched and embedded in the blind groove; the tail plug (4) is embedded in the tail end of the through groove (201) inside the anchor tube (2), the FRP reinforcing bar (1) passes through the tail plug (4), the head end cover plate (5) is closed and covered at the head end of the through groove (201) inside the anchor tube (2), and the adhesive (6) is filled in the anchor tube (2) so that the anchoring end of the FRP reinforcing bar (1) is fixed in the anchor tube (2) by the clamping device and the adhesive (6); The blind slots include a first blind slot (202) and a second blind slot (203), and the clamping members include a first clamping member (301) and a second clamping member (302). The two ends of the first clamping member (301) are respectively fitted into a pair of first blind slots (202), and the two ends of the second clamping member (302) are respectively fitted into a pair of second blind slots (203). The length direction of the first blind groove (202) and the second blind groove (203) is consistent with the axial direction of the through groove (201), and the width direction of the first blind groove (202) and the second blind groove (203) is consistent with the radial direction of the through groove (201). The plane containing the pair of first blind grooves (202) is perpendicular to the plane containing the pair of second blind grooves (203). The depth of the first blind groove (202) is less than the depth of the second blind groove (203). The vertical distance between the blind end of the first blind groove (202) and the blind end of the second blind groove (203) is greater than the height of the second clamping member (302). The depth of the first blind groove (202) is greater than the height of the first clamping member (301), so that the first clamping member (301) and the second clamping member (302) are vertically staggered and arranged in the anchor tube (2). The first end cover plate (5) is a circular structure, and the diameter of the first end cover plate (5) is the same as the diameter of the first end of the through groove (201); a number of protrusions (501) are formed at the edge of the first end cover plate (5), and the number of protrusions (501) are respectively embedded in the blind groove. The through groove (201) is a conical structure with a large diameter at the beginning and a small diameter at the end. A pair of first blind grooves (202) and a pair of second blind grooves (203) are symmetrically arranged at the beginning of the through groove (201). The diameter at the end of the through groove (201) is larger than the diameter of the FRP rib (1). The first clamping member (301) and the second clamping member (302) have the same structure; both the first clamping member (301) and the second clamping member (302) include a clamping hoop (303), a clamping plate (304) and a connecting member (305); a pair of clamping plates (304) are symmetrically connected to both ends of the semi-circular clamping hoop (303), and when the pair of clamping hoop (303) hugs the FRP bar (1), the clamping plates (304) at both ends are parallel and locked and fixed by the connecting member (305); the clamping plates (304) at both ends of the clamping hoop (303) are matched and embedded in the through groove; The tail plug (4) is a circular ring structure. The outer diameter of the tail plug (4) is the same as the tail end diameter of the through groove (201), and the inner diameter of the tail plug (4) is larger than the diameter of the FRP rib (1).

2. An anchoring method for the FRP rebar bonded-mechanical composite anchor as described in claim 1, characterized in that: Includes the following steps: Step 1: Clamp and fix the clamping part to the anchoring end of the FRP bar (1), and the clamping position of the clamping part corresponds to the position of the blind groove; Specifically, the first clamping member (301) and the second clamping member (302) are clamped on the FRP rib (1) respectively, and the first clamping member (301) and the second clamping member (302) are vertically staggered so that the clamping positions of the first clamping member (301) and the second clamping member (302) correspond to the positions of the first blind groove (202) and the second blind groove (203) respectively. Step 2: Insert the FRP bar (1) from the first end to the last end of the anchor tube (2) so that the anchoring end of the FRP bar (1) is located in the through groove (201). The first clamping member (301) is matched and embedded in the first blind groove (202), and the second clamping member (302) is matched and embedded in the second blind groove (203). Step 3: After passing the tail plug (4) through the FRP bar (1), seal the tail end of the through groove (201) in the anchor tube (2); Step 4: Inject adhesive (6) into the through groove (201) from the first end of the anchor tube (2). After the through groove (201) is filled with adhesive (6), cover the first end with the cover plate (5). When installing the first end cover plate (5), the protrusions (501) of the first end cover plate (5) are respectively embedded into the first blind groove (202) and the second blind groove (203) to seal the first blind groove (202) and the second blind groove (203); Step 5: Curing the adhesive (6) to complete the composite anchoring of the FRP bar (1).

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