CN101851985B - Articulated anchor and prestress tensioning method of high strength fibre composite sheet - Google Patents
Articulated anchor and prestress tensioning method of high strength fibre composite sheet Download PDFInfo
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- CN101851985B CN101851985B CN2010101838037A CN201010183803A CN101851985B CN 101851985 B CN101851985 B CN 101851985B CN 2010101838037 A CN2010101838037 A CN 2010101838037A CN 201010183803 A CN201010183803 A CN 201010183803A CN 101851985 B CN101851985 B CN 101851985B
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- 239000000463 material Substances 0.000 claims description 110
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 35
- 229910052802 copper Inorganic materials 0.000 claims description 35
- 239000010949 copper Substances 0.000 claims description 35
- 238000004873 anchoring Methods 0.000 claims description 31
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 9
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Abstract
An articulated anchor and a prestress tensioning method of high strength fibre composite sheet relate to an anchor holder used to perform prestress tensioning to the high strength fibre composite material of the enhancement or reinforcement engineering structure and a method thereof. The articulated anchor of the invention comprises an anchor head and a compression and locking device, and the articulated anchor is characterized in that the anchor head contains a raised head anchor and a concave block. The method of the invention is that the articulated anchor is used to clamp and anchor the two ends of FRP sheet, a jack is used to apply a tension on the concave block and the concave block pushes the raised head anchor to perform prestress tensioning to FRP sheet. The articulated anchor of the invention has simple structure, convenient installation and low cost; and the method of the invention is simple, intuitive and practical, and can ensure the tensioning uniformity of FRP sheet, made full use of the intensity of FRP sheet and effectively increase the bearing capacity of the engineering structure. The articulated anchor of the invention can be widely used to enhance or reinforce the large engineering structures such as bridges or buildings and especially to perform external prestressing reinforcement to longspan concrete beams, longspan concrete slabs and the like.
Description
One, technical field
The invention belongs to high strength fiber composite material prestressing stretching technique field, be specifically related to strengthen or the prestressed anchor clamp of high strength fiber composite material and the method for stabilization works structure.
Two, background technology
High strength fiber composite material (English name Fiber Reinforced Polymer; Be called for short FRP); Like carbon fibre reinforced plastic, high molecular polymer fibre reinforced plastics, glass fiber reinforced plastics etc.; Have, antifatigue big, characteristic such as corrosion-resistant, be widely used in fields such as space flight and aviation, aircraft manufacturing, sports entertainment article, boats and ships, automobile, building from heavy and light, bearing capacity.Particularly through the high strength fibre composite sheet of prestressed stretch-draw (being called for short the FRP sheet material); Can be widely used in strengthening or reinforcing civil engineering structure (like concrete structure, steel work, wooden construction etc.); Thereby improve the supporting capacity of engineering structures; And prolong its application life, have very important society, economic benefit.
The existing device that the FRP sheet material is carried out prestressed stretch-draw; Like the patent No. is " carbon fiber sheet pre-stress stretching device " patent of ZL200520051104.1; Disclosed carbon cloth pre-stress stretching device is graded by standing part and sliding part and to form, and standing part and slipper are provided with the permanent dull and stereotyped ground tackle to carbon fiber sheet; Anchor clamps through two jack synchronous push slippers are realized the prestressed stretch-draw to carbon fiber board, and this device mainly contains following shortcoming:
1. when with this device carbon fiber board being carried out prestressed stretch-draw, very high to the positioning accuracy request of anchoring crossbeam, the very difficult anchor clamps anchor accurate centering that guarantees carbon fiber board two ends during construction, hidden danger has been buried in the inhomogeneous stretch-draw of carbon fiber board during for stretch-draw.
2. this tensioning equipment adopts two hydraulic jack synchronous pushs, during to the stretch-draw of carbon fiber board, also is difficult to keep two jack precise synchronization, directly causes the inhomogeneous stretch-draw to carbon fiber board.
3. after carbon fiber board prestress tension was accomplished, the parts that forever are retained on the reinforced structure were many, and these parts can only disposablely use, thereby have increased the later maintenance expense, have correspondingly also increased the cost of prestressed reinforcement.
Existing method of the FRP sheet material being carried out prestressed stretch-draw; It like application number " transverse stretching method of prestressed fiber cloth reinforced concrete column " patent of 200910103192.8; Disclosed method for stretching is: two bracing frames are anchored on the concrete beam through screw rod, and the two ends of cloth are connected on the bracing frame through tool holder and connecting rod; The lateral bearing beam is established in the end that strides across cloth; The lateral bearing beam is connected with the tension rod that is fixed on the beam both sides; Synchronously the tensioning nut of rotating beam both sides drives the lateral bearing beam and moves to the concrete beam surface, makes the cloth elongation produce prestressing force simultaneously and is close to the surface of concrete beam; Again cloth is sticked on the concrete beam, and with fixture cloth is anchored on the concrete beam at the two ends of cloth.This method mainly contain following shortcoming:
1. this method is that pitch based fiber cloth is not carried out transverse stretching; And the actual stretch-draw intensity of pitch based fiber cloth is not very low; The length of cloth is long more; Actual stretch-draw intensity is just lower, and the pretension that can obtain is just very limited, thereby has reduced the consolidation effect to concrete beam.
2. when carrying out transverse stretching with this method, bigger if the relative deformation between the two end supports frame is big with causing to the loss of the pretension in the cloth, thus influence is to the consolidation effect of concrete beam.
3. moving of the lateral bearing beam of this method receives the control of both sides tensioning nut, is difficult to keep follow-up synchronously, and the uniformity of cloth stretch-draw is very poor, influences the intensity performance of cloth.
Three, summary of the invention
The objective of the invention is the FRP sheet material to be carried out the deficiency of the device and method of prestressed stretch-draw, the pre-stress stretching method of a kind of articulated anchor and high strength fibre composite sheet is provided, have the simple in structure of ground tackle to existing, easy for installation, with low cost; Method for stretching is directly perceived, simple, practical, and easy construction particularly can reliably realize the even stretch-draw to the FRP sheet material, can give full play to the characteristics such as high strength of FRP sheet material.
Mechanism of the present invention is that the front end of the anchor clamp of FRP sheet material (comprising waveform toothholder tool anchor, plate jig anchor etc.) is processed protruding circular-arc (being the plush copper anchor); And make the circular-arc pressure block (being the spill piece) of a spill with matching; The latter's arc radius is greater than the former, and both are combined together being hinged of can on arc contact surface, freely rotating each other of formation.When the FRP sheet material is carried out prestressed stretch-draw; With the two ends of fibre sheet material, carry out clamping and anchoring with this plush copper anchor, then through the automatic adjustment FRP sheet material prestressed stretch-draw direction that relatively rotates between spill piece and the plush copper anchor; Can guarantee that the FRP sheet material forms two one lines between two articulated anchors; Guarantee the uniformity when the FRP sheet material is drawn, improve its stretch-draw prestressing force, further improve the bearing capacity of enhancing and stabilization works structure.
The technical scheme that realizes the object of the invention is: a kind of articulated anchor mainly comprises anchor head and compresses and locking device that characteristic is that described anchor head is made up of plush copper anchor and spill piece.The plush copper anchor is made up of upper and lower clamping plate again, and the front end of the upper and lower clamping plate of plush copper anchor is cambered outwards arc surface.The spill piece of articulated anchor is made up of upper and lower half block, and the middle part of a side of spill piece is the arc surface that concaves, the interior concaved circular cambered surface coupling of the outer convex arc surface of plush copper anchor and spill piece, and the contact of formation face also forms the hinge connection of freely rotating each other.Middle part at the concave shaped arc surface of the upper and lower half block of spill piece; One open slot is set respectively; When the upper and lower half block of spill piece overlaps, constitute a rectangular groove of remaining silent (the FRP sheet material groove of promptly reserving) at the middle part of the concave shaped arc surface of spill piece, the sectional dimension of the size of the groove of remaining silent and FRP sheet material is complementary; So that the FRP sheet material can pass the rectangular groove and moving freely of remaining silent, receive force direction when the stretch-draw in order to regulate the FRP sheet material; Both sides at the reservation FRP sheet material groove of the upper and lower half block of spill piece; The open slot of one semicircle is set respectively; When the upper and lower half block of spill piece overlaps, constitute the closed pore (the connecting screw rod hole of promptly reserving) of two circles, the size of circular closed pore and the diameter of connecting screw rod are complementary; So that connecting screw rod passes circular closed pore, in order to connect spill piece and anchor block.Two ends at the upper and lower half block of spill piece are provided with bolt hole respectively accordingly, and when the upper and lower half block of spill piece overlapped, two fastening bolts passed bolt hole respectively and through nut the upper and lower half block of spill piece connected into an integral body.The upper and lower clamping plate of the plush copper anchor of the articulated anchor of described clamping and anchoring FRP sheet material are the upper and lower waveform tooth plate of waveform toothholder tool anchor, perhaps the upper and lower cover plate of plate jig anchor, the perhaps upper and lower clamping plate of other ground tackle.
A kind of pre-stress stretching method of high strength fibre composite sheet; Utilize the two ends of articulated anchor clamping of the present invention and anchoring FRP sheet material; Apply pulling force through reaction frame and jack pair spill piece, the spill piece promotes the plush copper anchor FRP sheet material is carried out prestressed stretch-draw.Its concrete grammar step is following:
(1) clamping and anchoring FRP sheet material
Anchor block is working parts, at the both ends of anchor block and corresponding to the place, connecting bolt hole of two reservations of the spill piece of articulated anchor, is respectively arranged with the connecting bolt hole, so that connecting screw rod passes.At the middle part of anchor block and corresponding to the FRP sheet material groove place of the reservation at the spill piece middle part of articulated anchor, the FRP sheet material groove reserved is set accordingly, so that the FRP sheet material passes.Described anchor block is steel construction piece commonly used.
During construction; Earlier with two anchor blocks; Connect through bolt respectively or welding or mode such as anchor into; Be fixedly connected on the engineering structures surface that is enhanced or reinforces, anchor block is confirmed according to the specific requirement of the engineering structures that is enhanced or reinforces and the length of FRP sheet material being enhanced or the spacing of structural particular location of stabilization works and two anchor blocks.
Refill and establish articulated anchor and clamping and anchoring FRP sheet material.To fixed end; Articulated anchor is installed in the inboard or the outside of anchor block: when articulated anchor is installed in the inboard (being to be separated by the plush copper anchor of articulated anchor between the spill piece of anchor block and articulated anchor) of anchor block; After two connecting screw rods pass the connecting screw rod hole of the spill piece two ends of anchor block and articulated anchor reserving respectively; With forward and backward anchoring nut the spill piece of anchor block and articulated anchor being fixedly connected respectively (is that the spill piece of articulated anchor is suspension status and is connected with anchor block; Being called suspension type connects); After then an end of FRP sheet material being passed the FRP sheet material groove of reservation at spill piece middle part of articulated anchor, be clamped between the upper and lower clamping plate of plush copper anchor of articulated anchor, again with articulated anchor compress and locking device compresses the FRP sheet material that upper and lower clamping plate reach clamping therebetween and lock; When articulated anchor is installed in the outside (being anchor block abuts against with the spill piece of articulated anchor) of anchor block; After two connecting screw rods pass the connecting screw rod hole of the spill piece two ends of anchor block and articulated anchor reserving respectively; With forward and backward anchoring nut the spill piece of anchor block and articulated anchor is fixedly connected respectively that (the spill piece and the anchor block that are articulated anchor are connection status back-to-back; Being called the formula that leans against connects); After then an end of FRP sheet material being passed the FRP sheet material groove of reservation at spill piece middle part of anchor block and articulated anchor; Be clamped between the upper and lower clamping plate of plush copper anchor of articulated anchor, again with articulated anchor compress and locking device compresses the FRP sheet material of upper and lower clamping plate and clamping therebetween and lock.To the stretch-draw end; Articulated anchor is installed in the inboard (being to be separated by the plush copper anchor of articulated anchor between the spill piece of anchor block and articulated anchor) of anchor block; After two connecting screw rods pass the connecting screw rod hole of the spill piece two ends of anchor block and articulated anchor reserving respectively; Respectively with of the spill piece fixed connection (be suspension type be connected) of forward and backward anchoring nut with anchor block and articulated anchor; After then the other end of FRP sheet material being passed the FRP sheet material groove of reservation at spill piece middle part of articulated anchor, be clamped between the upper and lower clamping plate of plush copper anchor of articulated anchor, again with articulated anchor compress and locking device compresses the FRP sheet material that upper and lower clamping plate reach clamping therebetween and lock.
When FRP sheet material and the engineering structures that is enhanced or reinforces have stickup to require; After the surfacings such as the adhesive surface to engineering structures also will be polished, cleaning; Again at the adhesive surface brushing cementing agent of engineering structures and FRP sheet material, so that the FRP sheet attaching is on the surface of the engineering structures that is enhanced or reinforces.
(2) the FRP sheet material is carried out prestressed stretch-draw
After the completion of (1) step; Respectively two connecting screw rods at the anchor block two ends of stretch-draw end are fixedly connected with two tensioning screw rods earlier with two sleeves; Again counter-force piece (being that steel plate is used in the construction that two ends are provided with bolt hole) is fixedly connected on two tensioning screw rods through two tensioning screw rods and counter-force nut, constitutes reaction frame.Then jack is placed between the anchor block and counter-force piece of stretch-draw end.Drive jack pushing tow counter-force piece then, the counter-force piece drives tensioning screw rod and moves together with connecting screw rod, and the articulated anchor of drive clamping and anchoring FRP sheet material stretch-draw end moves together, has realized utilizing articulated anchor and anchor block that the FRP sheet material is carried out prestressed stretch-draw.After the prestressed stretch-draw of FRP sheet material puts in place, tighten the back anchoring nut on the connecting screw rod of stretch-draw end earlier.
(3) remove jack and reaction frame
(2) step was withdrawn from jack earlier after accomplishing, and backed out the counter-force nut again, took off the counter-force piece, removed sleeve and tensioning screw rod at last.
Paste when requiring when FRP sheet material and the engineering structures that is enhanced or reinforces have, between the stickup face of FRP sheet material and the engineering structures that is enhanced and reinforces, replenish and pour into cementing agent, and till maintenance to the adhesive cures.
After the present invention adopts technique scheme, mainly contain following effect:
1. with articulated anchor clamping of the present invention and anchoring FRP sheet material; Can guarantee that the FRP sheet material regulates automatically and keep two one lines between two articulated anchors; Guarantee the uniformity when the FRP sheet material is drawn, improve its tension stress, further improve the bearing capacity of enhancing and stabilization works structure.
2. the method for stretch-draw FRP sheet material of the present invention is direct stretching method, and the pretension in the FRP sheet material is exactly the thrust of jack, can directly read through the oil pressure gauge of jack, and unusual intuitive and convenient, and be convenient to control stretching process.
3. can freely rotate between two parts of articulated anchor of the present invention (being plush copper anchor and spill piece); Not parallel or cause when misaligning the spill piece can not be exactly parallel or during centering when the position of anchor block; Its error can obtain revising with respect to relatively rotating of spill piece through the plush copper anchor; Guarantee that the FRP sheet material keeps accurate centering, the uniformity in the time of guaranteeing FRP sheet material prestressed stretch-draw automatically between articulated anchor.
4. identical plush copper anchor and spill piece and other standard fitting are adopted in the two ends of the FRP sheet material of the inventive method, make that installation, replacing, the dismounting of construction are all very simple and convenient, are convenient to standardized work, reduce construction costs.And parts are simple, are easy to produce in batches, reduce cost.
5 plush copper anchor structures of the present invention are simple, only need on the end face of anchor clamps such as existing waveform toothholder tool anchor, plate jig anchor, to transform slightly, and are very simple and convenient, and with low cost, easy to utilize.
6. the inventive method can be carried out prestressed stretch-draw and anchoring to the FRP sheet material of finished product; Compare not pitch based fiber cloth of stretch-draw; Not only stretching force is big; Prestressing force is effective, and can give full play to the intensity of FRP sheet material, and then can more effectively improve the bearing capacity of engineering structures and prolong its application life.
7. articulated anchor of the present invention can provide more reliably with can clamping making with the waveform toothholder tool anchor of the thick type composite material sheet of anchoring, bigger pretension, to improving the bearing capacity of reinforced structure, improves its functional performance and has effect more significantly.
The present invention can be widely used in building or strengthening or reinforce in major works structures such as bridge of building or building constructions; Be specially adapted to large-span concrete beam, plate etc. are carried out external prestressing strengthening; Improve the strength of materials utilization rate of FRP sheet material, significantly improve and be enhanced or the bearing capacity and application life of stabilization works structure.
Four, description of drawings
Fig. 1 is the schematic perspective view of articulated anchor clamping FRP sheet material of the present invention;
2 pairs of FRP sheet materials of Fig. 2 present embodiment carry out the sketch map of prestressed stretch-draw;
Fig. 3 is reinforced the engineering structures sketch map for 2 pairs of FRP sheet materials of embodiment carry out prestressed stretch-draw after accomplishing;
Fig. 4 carries out the sketch map of prestressed stretch-draw for 3 pairs of FRP sheet materials of embodiment;
Fig. 5 is reinforced the engineering structures sketch map for 3 pairs of FRP sheet materials of embodiment carry out prestressed stretch-draw after accomplishing.
Wherein: 1 plush copper anchor, the 1a train wheel bridge, 1b lower plate, 1c compress and locking device, 2 spill pieces, the last half block of 2a; Half block under the 2b, 2c are reserved the FRP sheet material groove of remaining silent, and 2d reserves connecting screw rod closed pore, 2e fastening bolt, 3FRP sheet material, 4 anchor blocks; 5 connecting screw rods, 6 preceding anchoring nuts, 7 back anchoring nuts, 8 jack, 9 counter-force pieces, 10 tensioning screw rods; 11 sleeves, 12 counter-force nuts, 13 girder steels that are reinforced, 14 concrete beam that are reinforced, 15 anchor into concrete bolt, 16 cementing agents.
Five, the specific embodiment
Below in conjunction with specific embodiment, further specify the present invention.
Embodiment 1
As shown in Figure 1, a kind of articulated anchor mainly comprises anchor head and compresses and locking device 1c, and characteristic is that described anchor head is made up of plush copper anchor 1 and spill piece 2.Plush copper anchor 1 is made up of upper and lower clamping plate 1a, 1b, and the upper and lower clamping plate 1a of plush copper anchor 1, the front end of 1b are cambered outwards arc surface.The spill piece 2 of articulated anchor is made up of upper and lower half block 2a, 2b; The middle part of one side of spill piece 2 is the arc surface that concaves; The interior concaved circular cambered surface coupling of the outer convex arc surface of plush copper anchor 1 and spill piece 2, the contact of formation face also forms the hinge connection of freely rotating each other.Middle part at the concave shaped arc surface of the upper and lower half block 2a of spill piece 2,2b; One open slot is set respectively; When the upper and lower half block of spill piece overlaps, constitute a rectangular groove 2c that remains silent (the FRP sheet material groove of promptly reserving) at the middle part of the concave shaped arc surface of spill piece, the size of the groove 2c that remains silent and the sectional dimension of FRP sheet material 3 are complementary; So that the FRP sheet material can pass the rectangular groove 2c and moving freely of remaining silent, receive force direction when the stretch-draw in order to regulate FRP sheet material 3; Both sides at the reservation FRP sheet material groove of the upper and lower half block 2a of spill piece 2,2b; The open slot of one semicircle is set respectively; As the upper and lower half block 2a of spill piece 2, when 2b overlaps, constitute the closed pore (the connecting screw rod hole 2d that promptly reserves) of two circles respectively, the diameter of the size of circular closed pore 2d and connecting screw rod 5 is complementary; So that connecting screw rod 5 passes circular closed pore 2d, in order to connect spill piece 2 and anchor block 4.Be provided with bolt hole respectively accordingly at the upper and lower half block 2a of spill piece 2, the two ends of 2b; When the upper and lower half block of spill piece overlapped, two fastening bolt 2e passed bolt hole respectively and through nut upper and lower half block 2a, the 2b of spill piece 2 are connected into an integral body.。
Like Fig. 2, shown in 3, a kind of concrete grammar step of pre-stress stretching method of high strength fibre composite sheet is following:
(1) clamping and anchoring FRP sheet material
With two anchor blocks 4, through the mode of welding, be fixedly connected on girder steel 13 surfaces that are reinforced respectively earlier.
Refill and establish articulated anchor and clamping and anchoring FRP sheet material 3.To fixed end; Articulated anchor is installed in the inboard (being to be separated by the plush copper anchor 1 of articulated anchor between the spill piece 2 of anchor block 4 and articulated anchor) of anchor block 4; After two connecting screw rods 5 pass the connecting screw rod hole of spill piece 2 two ends of anchor block 4 and articulated anchor reserving respectively; Respectively with of spill piece 2 fixed connections (be suspension type be connected) of forward and backward anchoring nut 6,7 with anchor block 4 and articulated anchor; After then an end of FRP sheet material 3 being passed the FRP sheet material groove 2c of reservation at spill piece 2 middle parts of articulated anchor; Be clamped between the upper and lower clamping plate 1a, 1b of the plush copper anchor 1 of articulated anchor, again with articulated anchor compress and locking device 1c compresses the FRP sheet material 3 of upper and lower clamping plate 1a, 1b and clamping therebetween and lock.To the stretch-draw end; Articulated anchor is installed in the inboard (being to be separated by the plush copper anchor 1 of articulated anchor between the spill piece 2 of anchor block 4 and articulated anchor) of anchor block 4; After two connecting screw rods 5 pass the connecting screw rod hole of spill piece 2 two ends of anchor block 4 and articulated anchor reserving respectively; Respectively with of spill piece 2 fixed connections (be suspension type be connected) of forward and backward anchoring nut 6,7 with anchor block 4 and articulated anchor; After then the other end of FRP sheet material 3 being passed the FRP sheet material groove 2c of reservation at spill piece 2 middle parts of articulated anchor; Be clamped between the upper and lower clamping plate 1a, 1b of the plush copper anchor 1 of articulated anchor, again with articulated anchor compress and locking device 1c compresses the FRP sheet material 3 of upper and lower clamping plate 1a, 1b and clamping therebetween and lock.
(2) the FRP sheet material is carried out prestressed stretch-draw
After the completion of (1) step; Respectively two connecting screw rods 5 at anchor block 4 two ends of stretch-draw end are fixedly connected with two tensioning screw rods 10 earlier with two sleeves 11; Again counter-force piece 9 (being the steel plate that two ends are provided with bolt hole) is fixedly connected on two tensioning screw rods 5 through two tensioning screw rods 10 and counter-force nut 12, constitutes reaction frame.Then jack 8 is placed between the anchor block 4 and counter-force piece 9 of stretch-draw end.Drive jack 8 pushing tow counter-force pieces 9 then; Counter-force piece 9 drives tensioning screw rod 10 and moves together with connecting screw rod 5; And the articulated anchor that drives clamping and anchoring FRP sheet material 3 stretch-draw ends moves together, realized utilizing 4 pairs of FRP sheet materials of articulated anchor and anchor block 3 to carry out prestressed stretch-draw.After the prestressed stretch-draw of FRP sheet material 3 puts in place, tighten the back anchoring nut 7 on the connecting screw rod 5 of stretch-draw end earlier.
(3) remove jack and reaction frame
(2) step was withdrawn from jack 8 earlier after accomplishing, and backed out counter-force nut 12 again, took off counter-force piece 9, removed sleeve 11 and tensioning screw rod 10 at last.
Like Fig. 4, shown in 5, a kind of pre-stress stretching method of high strength fibre composite sheet, with embodiment 2, wherein:
In (1) step, earlier with two anchor blocks 4,, be fixedly connected on concrete beam 14 surfaces that are enhanced or reinforce respectively through bolted mode, described bolt 15 anchors in the concrete beam 14 in advance.Refill and establish articulated anchor and clamping and anchoring FRP sheet material 3.To fixed end; Articulated anchor is installed in the outside (being anchor block abuts against with the spill piece of articulated anchor) of anchor block 4; After two connecting screw rods 5 pass the connecting screw rod hole of spill piece 2 two ends of anchor block 4 and articulated anchor reserving respectively; Respectively with of spill piece 2 fixed connections (promptly lean against formula be connected) of forward and backward anchoring nut 6,7 with anchor block 4 and articulated anchor; After then an end of FRP sheet material 3 being passed the FRP sheet material groove 2c of reservation at spill piece 2 middle parts of anchor block 4 and articulated anchor; Be clamped between the upper and lower clamping plate 1a, 1b of the plush copper anchor 1 of articulated anchor, again with articulated anchor compress and locking device 1c compresses the FRP sheet material 3 of upper and lower clamping plate 1a, 1b and clamping therebetween and lock.
Because FRP sheet material 3 has the stickup requirement with the surface of the concrete beam 14 that is enhanced or reinforces; After the surfacings such as the adhesive surface to concrete beam 14 also will be polished, cleaning; Again at the adhesive surface brushing cementing agent of concrete beam 14 and FRP sheet material 3, so that FRP sheet material 3 sticks on the surface of concrete beam 14.
In (3) step, between the stickup face of FRP sheet material and concrete beam 14, replenish the perfusion cementing agent, and till maintenance to the adhesive cures.
Claims (2)
1. articulated anchor; Mainly comprise anchor head and compress and locking device (1c); It is characterized in that described anchor head is made up of plush copper anchor (1) and spill piece (2), plush copper anchor (1) is made up of upper and lower clamping plate (1a, 1b), and the front end of the upper and lower clamping plate of plush copper anchor (1) (1a, 1b) is cambered outwards arc surface; The spill piece (2) of articulated anchor is made up of upper and lower half block (2a, 2b); The middle part of one side of spill piece (2) is the arc surface that concaves, the interior concaved circular cambered surface coupling of the outer convex arc surface of plush copper anchor (1) and spill piece (2), and the contact of formation face also forms the hinge connection of freely rotating each other; Middle part at the concave shaped arc surface of the upper and lower half block (2a, 2b) of spill piece (2); One open slot is set respectively; When the upper and lower half block (2a, 2b) of spill piece (2) overlaps; Middle part at the concave shaped arc surface of spill piece (2) constitutes a rectangular groove of remaining silent (2c), the FRP sheet material groove of promptly reserving, and the sectional dimension of the size of the groove of remaining silent (2c) and FRP sheet material (3) is complementary; Both sides at the reservation FRP sheet material groove of the upper and lower half block (2a, 2b) of spill piece (2); The open slot of one semicircle is set respectively; When the upper and lower half block (2a, 2b) of spill piece (2) overlaps; Constitute the closed pore (2d) of two circles, the connecting screw rod hole of promptly reserving, the diameter of the size of circular closed pore (2d) and connecting screw rod (5) is complementary; Two ends at the upper and lower half block (2a, 2b) of spill piece (2); Be provided with bolt hole respectively accordingly; When the upper and lower half block (2a, 2b) of spill piece (2) overlapped, two fastening bolts (2e) passed bolt hole respectively and through nut the upper and lower half block (2a, 2b) of spill piece (2) are connected into an integral body.
2. one kind is utilized the articulated anchor described in the claim 1 that high strength fibre composite sheet is carried out the method for prestressed stretch-draw, it is characterized in that concrete method step is following:
(1) clamping and anchoring FRP sheet material
Earlier with two anchor blocks (4); The mode that connects or weld or anchor into through bolt respectively; Be fixedly connected on the engineering structures surface that is enhanced or reinforces; Anchor block (4) is confirmed according to the specific requirement of the engineering structures that is enhanced or reinforces and the length of FRP sheet material (3) being enhanced or the spacing of structural particular location of stabilization works and two anchor blocks (4);
Refill and establish articulated anchor and clamping and anchoring FRP sheet material (3); To fixed end; Articulated anchor is installed in the inboard or the outside of anchor block (4): when articulated anchor is installed in anchor block (4) inboard; After two connecting screw rods (5) pass the connecting screw rod hole of spill piece (2) two ends of anchor block (4) and articulated anchor reserving respectively; Use forward and backward anchoring nut (6,7) that the spill piece (2) of anchor block (4) and articulated anchor is fixedly connected respectively; After then an end of FRP sheet material (3) being passed the FRP sheet material groove (2c) of reservation at spill piece (2) middle part of articulated anchor; Be clamped between the upper and lower clamping plate (1a, 1b) of plush copper anchor (1) of articulated anchor, again with articulated anchor compress and locking device (1c) compresses the FRP sheet material (3) of upper and lower clamping plate (1a, 1b) and clamping therebetween and lock; When articulated anchor is installed in the outside of anchor block (4); After two connecting screw rods (5) pass the connecting screw rod hole of spill piece (2) two ends of anchor block (4) and articulated anchor reserving respectively; Use forward and backward anchoring nut (6,7) that the spill piece (2) of anchor block (4) and articulated anchor is fixedly connected respectively; After then an end of FRP sheet material (3) being passed the FRP sheet material groove (2c) of reservation at spill piece (2) middle part of anchor block (4) and articulated anchor; Be clamped between the upper and lower clamping plate (1a, 1b) of plush copper anchor (1) of articulated anchor, again with articulated anchor compress and locking device (1c) compresses the FRP sheet material (3) of upper and lower clamping plate (1a, 1b) and clamping therebetween and lock; To the stretch-draw end; Articulated anchor is installed in the inboard of anchor block (4); After two connecting screw rods (5) pass the connecting screw rod hole of spill piece (2) two ends of anchor block (4) and articulated anchor reserving respectively; Use forward and backward anchoring nut (6,7) that the spill piece (2) of anchor block (4) and articulated anchor is fixedly connected respectively; After then the other end of FRP sheet material (3) being passed the FRP sheet material groove (2c) of reservation at spill piece (2) middle part of articulated anchor, be clamped between the upper and lower clamping plate (1a, 1b) of plush copper anchor (1) of articulated anchor, again with articulated anchor compress and locking device (1c) compresses the FRP sheet material (3) that upper and lower clamping plate (1a, 1b) reach clamping therebetween and lock;
Paste when requiring when FRP sheet material (3) and the engineering structures that is enhanced or reinforces have, to the adhesive surface of engineering structures also to polish, after clean Surface handles, again at the adhesive surface brushing cementing agent (16) of engineering structures and FRP sheet material;
(2) the FRP sheet material is carried out prestressed stretch-draw
After the completion of (1) step; Respectively two connecting screw rods (5) at anchor block (4) two ends of stretch-draw end are fixedly connected with two tensioning screw rods (10) earlier with two sleeves (11); Again counter-force piece (9) is fixedly connected on two tensioning screw rods (10) through two tensioning screw rods (10) and counter-force nut (12), constitutes reaction frame; Then jack (8) is placed between the anchor block (4) and counter-force piece (9) of stretch-draw end; And then driving jack (8) pushing tow counter-force piece (9); Counter-force piece (9) drives tensioning screw rod (10) and connecting screw rod (5) moves together; And the articulated anchor that drives clamping and anchoring FRP sheet material (3) stretch-draw end moves together, realized utilizing articulated anchor and anchor block (4) that FRP sheet material (3) is carried out prestressed stretch-draw; After the prestressed stretch-draw of FRP sheet material (3) puts in place, tighten the back anchoring nut (7) on the connecting screw rod (5) of stretch-draw end earlier;
(3) remove jack and reaction frame
(2) step was withdrawn from jack (8) earlier after accomplishing, and backed out counter-force nut (12) again, took off counter-force piece (9), removed sleeve (11) and tensioning screw rod (10) at last;
Paste when requiring when FRP sheet material (3) and the engineering structures that is enhanced or reinforces have, between the stickup face of FRP sheet material and the engineering structures that is enhanced and reinforces, replenish perfusion cementing agent (16), and till maintenance to cementing agent (16) curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101838037A CN101851985B (en) | 2010-05-27 | 2010-05-27 | Articulated anchor and prestress tensioning method of high strength fibre composite sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101838037A CN101851985B (en) | 2010-05-27 | 2010-05-27 | Articulated anchor and prestress tensioning method of high strength fibre composite sheet |
Publications (2)
| Publication Number | Publication Date |
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| CN101851985A CN101851985A (en) | 2010-10-06 |
| CN101851985B true CN101851985B (en) | 2012-08-08 |
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| CN2010101838037A Expired - Fee Related CN101851985B (en) | 2010-05-27 | 2010-05-27 | Articulated anchor and prestress tensioning method of high strength fibre composite sheet |
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