CN107700867A - A kind of flexible FRP sheet materials pre-stress stretching device and method - Google Patents

A kind of flexible FRP sheet materials pre-stress stretching device and method Download PDF

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Publication number
CN107700867A
CN107700867A CN201710957544.0A CN201710957544A CN107700867A CN 107700867 A CN107700867 A CN 107700867A CN 201710957544 A CN201710957544 A CN 201710957544A CN 107700867 A CN107700867 A CN 107700867A
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CN
China
Prior art keywords
sheet materials
frp sheet
ripple plate
spool
flexible
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Pending
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CN201710957544.0A
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Chinese (zh)
Inventor
郭馨艳
黄培彦
郑小红
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South China University of Technology SCUT
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South China University of Technology SCUT
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Filing date
Publication date
Application filed by South China University of Technology SCUT filed Critical South China University of Technology SCUT
Priority to CN201710957544.0A priority Critical patent/CN107700867A/en
Publication of CN107700867A publication Critical patent/CN107700867A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing
    • E04G21/121Construction of stressing jacks
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0255Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
    • E04G2023/0259Devices specifically adapted to stress the fiber reinforced plastic elements

Abstract

The invention discloses a kind of flexible FRP sheet materials pre-stress stretching device, including reaction frame, screw rod, locking nut, FRP sheet material fixtures, the screw rod other end is connected with stretch power device, the FRP sheet materials fixture includes upper ripple plate, lower ripple plate, spool, fixing bolt, the inner surface setting that the upper ripple plate and lower ripple plate fit has the corrugated concave-convex curved surface being mutually matched, the inner surface of the upper ripple plate and lower ripple plate is in one end of close screw rod formed with cylindrical cavity, the spool, which is fixed by positioning device, to be arranged in cylindrical cavity, flexible FRP sheet materials stretch out after spool winding is pasted from the upper horizontal of spool.The invention also discloses a kind of flexible FRP sheet materials pre-stress stretching method.The present invention has the characteristics that small volume, in light weight, simple to operate, it is convenient to applied to laboratory experiment and job site, the shortcomings that slip when avoiding flexible FRP sheet materials tensioning in fixture, raising tensioning efficiency and FRP stress distribution.

Description

A kind of flexible FRP sheet materials pre-stress stretching device and method
Technical field
Patent of the present invention is related to prestressed structure engineering field, especially for the flexible FRP sheet materials of solution in stretching process In easily slided in fixture and cause clamping effect bad and reduce a kind of pre-stress stretching device and method of stress distribution.
Background technology
Using fibre reinforced composites(Fiber Reinforced Polymer, FRP)To reinforced concrete structure, steel Structure, timber structure, masonry structure etc. are reinforced, and are a kind of advanced reinforcement means.The side of passive enforcement is carried out with pasting FRP Method is compared, and structure is reinforced using the FRP sheet materials through prestressed stretch-draw, can more fully hereinafter play FRP high strength characteristics, Improve the stress distribution in reinforced structure, suppress malformation and the germinating of crackle and extension, improve and reinforce efficiency, finally reach To the purpose of effectively extending structure service life, there is important social and economic benefit.
, in order to reach efficient, reliable, durable, economic and easy to use purpose for pre-stress FRP reinforcement technique Ask the technology of each master operation such as the clamping, tensioning, anchoring of pre-stress FRP, method and device all must be constructed around how realizing " reduce the loss of prestress of system as far as possible, improve stress distribution " this objectives.Therefore, require corresponding fixture tool The features such as holding tight, on-slip, not causing damage to FRP, FRP uniform forces can be made, be small and exquisite;It is required that method for stretching and dress Putting has the characteristics that to make high FRP uniform stresseds, stress distribution, Stress Control and easy to operate;It is required that anchorage it is firm it is firm, The features such as durable, anti-loosening.
According to above-mentioned requirements, the special anchor/fixture of existing FRP sheet materials is made a general survey of, such as " the high intensity of Application No. 02244587.0 Composite waveform tooth clamp anchor " patent and Application No. 03117814.6 " clamping and anchoring high strength composite it is new Anchor clamp described in method " patent, be by upper and lower two pieces of waveform tooth plates by FRP sheet materials coincide clamping, then by bolt by it is upper, Lower anchor slab is close, reaches clamping and anchoring effect.The frictional force that such fixture relies primarily on waveform tooth plate and FRP sheet materials is pressed from both sides Hold and grappling, when stress distribution is larger, clamping and anchoring effect are bad, easily skid.
Above-mentioned patent inventor is in another patent(Application No. 200820097782.5 " a kind of waveform tooth clamp anchor Pressing device ")In, by locking device by high-strength bolt be changed to jack and hydraulic system locked above and below two pieces of waveform teeth Plate, solves the shortcomings that fastening force deficiency.But due to adding jack and hydraulic system so that package unit become it is complicated, Build is huge, cost is high, it has not been convenient to operates, is also unfavorable for engineering popularization and application.The patent inventor is in its another patent(Application Number for 02128047.9 the construction method of anchoring " prestressing force stretching high strength composite material and ")Tensioning about FRP sheet materials In scheme, FRP sheet materials are forced to be deformed to apply prestressing force by increasing waveform tooth plate fixture between two anchorages, but apply The stress distribution added is relatively low and the more difficult control of stress distribution size.
Other special anchor/fixtures of FRP sheet materials, such as " the wedged variable-corrugated intermediate plate fiber of Application No. 200710035129.6 Sheet material Special ground tackle " patent, it is that FRP sheet materials are passed through into outer anchor shell, and is clipped between the wedged variable-corrugated intermediate plate of two panels up and down, passes through High-strength bolt adjusts the distance of pressure cover and outer anchor shell, and FRP sheet materials are clamped so as to promote wedge-shaped intermediate plate to apply pressure.The patent is public In the pre-stress stretching method opened, the anchorage is used in Post-tension Prestress Construction need to use the jack after improving to be used to press from both sides FRP sheet materials are held, and jack directly clamps flexible FRP sheet materials there is also anchorage problem, so the versatility of the patent is bad;Separately Outside when it is used for stretching end, upper and lower contoured clips can be produced compared with macrolesion to FRP, and due to the waveform of self-lock mechanism compression Intermediate plate is not easy to unclamp, operating difficulties.The patentee is in another patent(" the combined variable ripple of Application No. 200810031451.6 Line fibre sheet material Special ground tackle and its prestressed stretch-draw ")It is middle to be changed to adjust using the top pull device of fluid pressure type by locking mode The position of contoured clips, it is easy to grappling and unclamps FRP sheet materials.But increase hydraulic system can equally cause package unit to become multiple Miscellaneous, build is huge and cost is high, operating difficulties, is unfavorable for engineering popularization and application.
Method on carrying out prestressed stretch-draw to FRP sheet materials, such as " the FRP sheet materials of Application No. 201010137082.0 Anchorage and its anchoring process " patent, it is to be placed in FRP sheet materials upper anchor slab and lower anchor slab through bellows, upper anchor slab is with FRP sheet materials coincide by anchor slab to be clamped, then by bolt that upper and lower anchor slab is close.FRP sheet materials stretching plan disclosed in the patent It is that the fixture that stretching end uses is Wedge gripping, fixing end uses waveform fixture, and the operation principle of two kinds of fixtures is different, and wedge Clamp is bad for the clamping effect of flexible FRP sheet materials, and easily FRP is caused to damage, the complex process in strengthening construction, In the presence of certain potential safety hazard during normal work.
" being used for the wraparound formula waveform anchor of fibre sheet material and its pre- method for stretching " of Application No. 201410077668.6 is specially Profit, it is the both ends for holding and anchoring FRP sheet materials by wraparound formula waveform grip, pulls one end wraparound formula waveform anchor, realize FRP sheet materials Longitudinal tensioning.There is the major defect of FRP sheet materials stretching plan disclosed in the patent:1)By pulling wraparound formula waveform anchor come real The tensioning of existing FRP sheet materials, in stretching process, one end arc convex of wraparound formula waveform anchor can produce to upper and lower waveform tooth plate Separating force, upper and lower waveform tooth plate is produced gap, cause the slip of sheet material, compare in itself especially for flexible sheet material It is sliding, it is easier to cause the slip in stretching process to relax, tensioning efficiency is low;2)Carbon fibre reinforced composite(CFRP)It is anti- It is weak to cut ability, is clamped using wraparound formula, the wraparound end size increase of inevitable requirement fixture;3)Wraparound formula waveform anchor and upper and lower ripple The split of shape tooth plate designs, anchor with and shape of the upper and lower waveform tooth plate in contact position precision of coincideing it is high, so processing technology is carried Higher requirement is gone out.
In summary, the anchor clamp of existing FRP sheet materials will reach efficient, reliable, durable, economic and easy to use design It is required that there is certain distance.
The content of the invention
For above-mentioned technical problem, it is an object of the invention to provide a kind of flexible FRP sheet materials pre-stress stretching device and side Method, so as to solve the problems, such as that flexible sheet material easily slides in fixture in stretching process, FRP sheet material discontinuity, reduce In stretching process due to slip and caused by loss of prestress, improve tensioning efficiency.
Technical scheme is as follows:
A kind of flexible FRP sheet materials pre-stress stretching device, including two reaction frames spaced apart being oppositely arranged, it is each anti- Power frame is connected with FRP sheet material fixtures by screw rod and locking nut respectively, and the screw rod of one of connection FRP sheet material fixtures is another End is connected with stretch power device, and described FRP sheet materials fixture includes upper ripple plate, lower ripple plate, the spool of cylinder, fixed spiral shell The inner surface setting that bolt, the upper ripple plate and lower ripple plate fit has the corrugated concave-convex curved surface being mutually matched, can be to flexible FRP Sheet material plays a part of clamping and increases friction and on-slip.Wherein, the inner surface of the upper ripple plate and lower ripple plate is close to screw rod One end formed with cylindrical cavity, described spool, which is fixed by positioning device, to be arranged in the cylindrical cavity, flexible FRP pieces Material is stretched out after spool winding is pasted from the upper horizontal of spool, and FRP sheet materials are reduced in stretching process to upper and lower ripple to reach The effect of the separating force of plate, the upper ripple plate are fixedly connected with lower ripple plate by fixing bolt.
Further, described positioner includes pin, is provided through on described upper ripple plate and spool and institute The pin hole that pin is engaged is stated, positioning and fixed effect are played to spool, prevents rotation and displacement.
Further, described positioner includes screw, is provided through on described upper ripple plate and spool and institute The screw hole that screw is engaged is stated, positioning and fixed effect are played to spool, prevents rotation and displacement.
Further, described stretch power device uses jack.
Further, described reaction frame is bolted on base.
Further, the bottom of the FRP sheet materials fixture is provided with movable support, prevents FRP sheet materials fixture because of weight Power and influence stress.
Further, described screw rod one end is fixedly connected by screw thread with the lower ripple plate, and the other end passes through reaction frame It is connected after connecting hole by locking nut.
A kind of flexible FRP sheet materials pre-stress stretching method based on described device, including step:
1) fixing bolt is unclamped, upper ripple plate and lower ripple plate is separated, the one ends wound of flexible FRP sheet materials is pasted on spool, then Spool after winding FRP sheet materials is put into the cylindrical cavity of lower ripple plate, and the flexible FRP sheet materials for being pasted on spool will have been wound Stretched out from the upper horizontal of spool, in order to reduce the separating force produced in stretching process to upper ripple plate, increase FRP pieces The frictional force of material and waveform fixture, and increase the stretch-draw prestressing force degree of FRP sheet materials;
2) flexible FRP sheet materials cover upper ripple plate after lower ripple plate tiles and tenses, and are consolidated spool and upper ripple plate with positioner It is scheduled on together, avoids spool from being rotated in cavity, is then tightened upper ripple plate and lower ripple plate with fixing bolt;
3) repeat step 1) and 2), the other end of flexible FRP sheet materials and another FRP sheet materials fixture are installed and clamped;
4) one end of two screw rods is screwed into respectively in the screw of two fixtures, the other end is inserted respectively into the reaction frame at both ends In, then be fixedly connected by locking nut;
5) by having stretch power device to flexible FRP sheet materials stretch-draw prestressing force, when reaching the degree of prestressing of setting, spiral shell is tightened The locking nut of bar and reaction frame.
Further, in step 5), before having stretch power device to flexible FRP sheet materials stretch-draw prestressing force, first adjust The relative position of two reaction frames makes the cable tensios control of flexible FRP sheet materials in the stroke range of stretch power device.
Compared with prior art, the beneficial effects of the invention are as follows:To flexible FRP sheet materials(FRP cloth, thin fiber board etc.)Opened When drawing prestressing force, flexible FRP pieces are avoided by carrying out the double action of end winding and corrugated clamping to FRP flexible sheet materials Slip of the material in fixture, increase prestressed stretch-draw degree, improve tensioning efficiency.Whole device is small and exquisite, securely and reliably, operation Simply, laboratory and various job sites can be conveniently used in.
Brief description of the drawings
Fig. 1 is the structural representation of present clip and screw rod.
Fig. 2 is the Structure explosion diagram of present clip screw rod.
Fig. 3 is the use schematic diagram of apparatus of the present invention.
Reference:1- upper ripple plates, ripple plate under 2-, 3 cylindrical cavities, 4- spools, 5- fixing bolts, 6- screw rods, 7- pins, 8- reaction frames, 9- flexibility FRP sheet materials, 10- jack, 11- locking nuts.
Embodiment
The goal of the invention of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, embodiment is not It can repeat one by one herein, but therefore embodiments of the present invention are not defined in following examples.
As shown in Figure 1 to Figure 3, a kind of flexible FRP sheet materials pre-stress stretching device, including two spaced apart relative The reaction frame 8 of setting, the reaction frame 8 are bolted on base, and each reaction frame 8 passes through screw rod 6 and locking respectively Nut 11 is connected with FRP sheet material fixtures, and the other end of screw rod 6 of one of connection FRP sheet material fixtures is connected with stretch power dress Put, described stretch power device uses jack 10;Described FRP sheet materials fixture includes upper ripple plate 1, lower ripple plate 2, cylinder Spool 4, fixing bolt 5, the inner surface setting that the upper ripple plate 1 and lower ripple plate 2 fit has the corrugated being mutually matched recessed Convex surface, flexible FRP sheet materials can be played a part of clamping and increase friction and on-slip.Wherein, the upper ripple plate 1 and lower ripple plate For 2 inner surface in one end of close screw rod 6 formed with cylindrical cavity 3, described spool 4, which is fixed by positioning device, is arranged on institute State in cylindrical cavity 3, flexible FRP sheet materials stretch out after the winding of spool 4 is pasted from the upper horizontal of spool 4, to reach in tensioning During to reduce effect of the FRP sheet materials to the separating force of upper and lower ripple plate, the upper ripple plate 1 and lower ripple plate 2 solid by fixing bolt 5 Fixed connection.
Described positioner includes two pins 7, be provided through on described upper ripple plate 1 and spool 4 two with The pin hole that the pin 7 is engaged, during installation, pin hole that pin 7 is inserted on upper ripple plate 1 and spool 4, you can to spool Positioning and fixed effect are played, prevents rotation and displacement.
In addition, the bottom of the FRP sheet materials fixture is provided with movable support, prevent FRP sheet material fixtures because of gravity and Influence stress.Described one end of screw rod 6 is fixedly connected by screw thread with the lower ripple plate 2, and the other end passes through the connecting hole of reaction frame 8 It is connected afterwards by locking nut 11.
In another feasible embodiment of the invention, described positioner includes screw, described upper ripple plate 1 and volume It is provided through the screw hole being engaged with the screw on axle 4, during installation, screw is screwed in into described upper ripple plate 1 and volume Screw hole on axle 4, you can positioning and fixed effect are played to spool, prevents rotation and displacement.
A kind of flexible FRP sheet materials pre-stress stretching method based on described device, including step:
1) fixing bolt 5 is unclamped, upper ripple plate 1 and lower ripple plate 2 is separated, the one ends wound of flexible FRP sheet materials 9 is pasted on volume Axle 4, then the spool 4 after winding FRP sheet materials is put into the cylindrical cavity of lower ripple plate 2, and it is pasted on the soft of spool 4 by having wound Property FRP sheet materials 9 stretched out from the upper horizontal of spool 4, in order to reduce the separation produced in stretching process to upper ripple plate Power, the frictional force of increase FRP sheet materials and waveform fixture, and increase the stretch-draw prestressing force degree of FRP sheet materials;
2) flexible FRP sheet materials 9 cover upper ripple plate 1 after lower ripple plate 2 tiles and tenses, with positioner by spool 4 and upper ripple Plate 1 is fixed together, and avoids spool 4 from being rotated in cavity 3, is then tightened upper ripple plate 1 and lower ripple plate 2 with fixing bolt 5;
3) repeat step 1) and 2), the other end of flexible FRP sheet materials 9 and another FRP sheet materials fixture are installed and clamped;
4) one end of two screw rods 6 is screwed into respectively in the screw of two fixtures, the other end is inserted respectively into the reaction frame 8 at both ends In, then be fixedly connected by locking nut 11;
5) by having stretch power device to the flexible stretch-draw prestressing force of FRP sheet materials 9, when reaching the degree of prestressing of setting, tighten The locking nut 11 of screw rod 6 and reaction frame 8.
In addition, in the step 5), before having stretch power device to the flexible stretch-draw prestressing force of FRP sheet materials 9, first adjust The relative position of two reaction frames 8 makes the cable tensios control of flexible FRP sheet materials 9 in the stroke range of stretch power device.
The present invention is by analyzing loading characteristic of the flexible FRP sheet materials in stretching process, it is proposed that one kind is directed to Flexible FRP sheet materials pre-stress stretching device and method.Above-described embodiment to FRP flexible sheet materials by carrying out end winding and ripple The double action of shape clamping avoids slip of the flexible FRP sheet materials in fixture, and cylindrical cavity is devised in fixture, Make in the spool that flexible FRP sheet materials dispose in cylindrical cavity winding paste it is fixed after protrude horizontally up, reduce in stretching process The separating force of upper and lower ripple plate, the frictional force of FRP sheet materials and upper and lower ripple plate is added, so as to avoiding the cunning of flexible FRP sheet materials It is dynamic, increase the stretch-draw prestressing force degree of FRP sheet materials.
Wherein, upper ripple plate 1 and the lower inner face of ripple plate 2 are designed with corrugated curved surface, and concavo-convex identical curved surface is played to soft up and down The clamping action of property FRP sheet materials.Wherein, the inner surface of the upper ripple plate 1 and lower ripple plate 2 close to screw rod 6 one end formed with Cylindrical cavity 3, described spool 4, which is fixed by positioning device, to be arranged in the cylindrical cavity 3, as to flexible FRP sheet materials Fixed component is pasted in the winding of end.The design that the cylindrical cavity 3 sinks, make flexible FRP sheet materials wound by spool after energy Enough protrude horizontally up, reduce in FRP stretching processes to the upward separating force of upper ripple plate.The present invention is except to flexible FRP sheet materials Carry out outside prestressed stretch-draw, can also be applied to the prestressed stretch-draw of other flexible materials.
The spool is fixed by the pin-and-hole at both ends using pin with upper ripple plate.Upper ripple plate 1 and lower ripple plate 2 pass through fixed spiral shell Bolt 5 is attached fixation.Whole pre-stress stretching device is carried out by screw rod 6 and reaction frame 8, jack 10 and locking nut 11 Anchoring, fully meets efficient, reliable, durable, economic and easy to use design requirement.
The above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not to the present invention Embodiment restriction.For those of ordinary skill in the field, can also make on the basis of the above description Other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all the present invention All any modification, equivalent and improvement made within spirit and principle etc., should be included in the protection of the claims in the present invention Within the scope of.

Claims (9)

1. a kind of flexible FRP sheet materials pre-stress stretching device, including two reaction frames (8) spaced apart being oppositely arranged, Each reaction frame (8) is connected with FRP sheet material fixtures by screw rod (6) and locking nut (11) respectively, one of connection FRP pieces Screw rod (6) other end of material fixture is connected with stretch power device, it is characterised in that:
Described FRP sheet materials fixture includes upper ripple plate (1), lower ripple plate (2), the spool (4) of cylinder, fixing bolt (5), described The inner surface setting that upper ripple plate (1) and lower ripple plate (2) fit has the corrugated concave-convex curved surface being mutually matched, wherein, it is described on Ripple plate (1) and the inner surface of lower ripple plate (2) close to one end of screw rod (6) formed with cylindrical cavity (3), described spool (4) It is fixed by positioning device and is arranged in the cylindrical cavity (3), flexible FRP sheet materials is after spool (4) winding is pasted from spool (4) upper horizontal is stretched out, and the upper ripple plate (1) is fixedly connected with lower ripple plate (2) by fixing bolt (5).
2. flexible FRP sheet materials pre-stress stretching device according to claim 1, it is characterised in that:Described positioner Including pin (7), the pin being engaged with the pin (7) is provided through on described upper ripple plate (1) and spool (4) Hole.
3. flexible FRP sheet materials pre-stress stretching device according to claim 1, it is characterised in that:Described positioner Including screw, the screw hole being engaged with the screw is provided through on described upper ripple plate (1) and spool (4).
4. flexible FRP sheet materials pre-stress stretching device according to claim 1, it is characterised in that:Described stretch power Device uses jack (10).
5. flexible FRP sheet materials pre-stress stretching device according to claim 1, it is characterised in that:Described reaction frame (8) It is bolted on base.
6. flexible FRP sheet materials pre-stress stretching device according to claim 1, it is characterised in that:The FRP sheet materials fixture Bottom be provided with movable support.
7. flexible FRP sheet materials pre-stress stretching device according to claim 1, it is characterised in that:Described screw rod (6) one end It is fixedly connected by screw thread with the lower ripple plate (2), the other end passes through locking nut (11) after passing through the connecting hole of reaction frame (8) It is connected.
8. a kind of flexible FRP sheet materials pre-stress stretching method based on device any one of claim 1 to 7, its feature It is, including step:
1) fixing bolt (5) is unclamped, separates upper ripple plate (1) and lower ripple plate (2), by the one ends wound of flexible FRP sheet materials (9) Spool (4) is pasted on, then the spool (4) after winding FRP sheet materials is put into the cylindrical cavity of lower ripple plate (2), and will have been wound The flexible FRP sheet materials (9) for being pasted on spool (4) are stretched out from the upper horizontal of spool (4);
2) flexible FRP sheet materials (9) cover upper ripple plate (1) after lower ripple plate (2) is tiled and tenses, with positioner by spool (4) it is fixed together with upper ripple plate (1), is then tightened upper ripple plate (1) and lower ripple plate (2) with fixing bolt (5);
3) repeat step (1) and (2), the other end of flexible FRP sheet materials (9) and another FRP sheet materials fixture are installed and clamped;
4) one end of two screw rods (6) is screwed into the screw of two fixtures respectively, the other end is inserted respectively into the counter-force at both ends In frame (8), then it is fixedly connected by locking nut (11);
5) by having stretch power device to flexible FRP sheet materials (9) stretch-draw prestressing force, when reaching the degree of prestressing of setting, twist The locking nut (11) of tight screw rod (6) and reaction frame (8).
9. flexible FRP sheet materials pre-stress stretching method according to claim 8, it is characterised in that:In the step 5), lead to Before stretch power device has been crossed to flexible FRP sheet materials (9) stretch-draw prestressing force, the relative position of two reaction frames (8) is first adjusted Make the cable tensios control of flexible FRP sheet materials (9) in the stroke range of stretch power device.
CN201710957544.0A 2017-10-13 2017-10-13 A kind of flexible FRP sheet materials pre-stress stretching device and method Pending CN107700867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710957544.0A CN107700867A (en) 2017-10-13 2017-10-13 A kind of flexible FRP sheet materials pre-stress stretching device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710957544.0A CN107700867A (en) 2017-10-13 2017-10-13 A kind of flexible FRP sheet materials pre-stress stretching device and method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111021632A (en) * 2019-12-26 2020-04-17 北京工业大学 FRP multilayer sheet anchoring system based on ring-clamp synergistic effect

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111021632A (en) * 2019-12-26 2020-04-17 北京工业大学 FRP multilayer sheet anchoring system based on ring-clamp synergistic effect

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