CN2856239Y

CN2856239Y - Anchoring means for prestressed fiber cloth reinforced concrete structure

Info

Publication number: CN2856239Y
Application number: CN 200520066773
Authority: CN
Inventors: 张建伟; 杜修力; 邓宗才; 何唯平
Original assignee: Shenzhen Oceanpower Industrial Co Ltd
Current assignee: Shenzhen Oceanpower Industrial Co Ltd
Priority date: 2005-11-08
Filing date: 2005-11-08
Publication date: 2007-01-10
Anticipated expiration: 2015-11-08

Abstract

The utility model discloses an anchor for a concrete structure reinforced with prestressed fabric, which comprises a fixed part, a movable part, and a connecting screw therebetween. The fixed part is fixed on a concrete surface; the movable part is provided with fabric affixed to one surface adjacent to the concrete surface; the screw is connected to the fixed part at one end and to the movable part at the other while being capable of adjusting the distance between the two parts; and the movable part is provided with a pressure bar mounted on another surface, the pressure bar being fixed on the concrete surface and connected to the movable part with an arc-shaped and polished joint surface, thus ensuring a tight adherence of the fabric-affixed surface of the movable part to the concrete surface as well as low friction loss of prestress during stretching. The utility model ensures low chance of damage on the concrete surface, high control stress for stretching of the prestressed fabric, and reliable adherence between the prestressed fabric and the concrete surface. The anchor can be permanently retained on the reinforced structure with its rack being used as a counterforce rack during application of prestress, thereby realizing low loss of prestress upon stretching out. The anchor is also advantaged in simple structure, simplicity of construction and application, as well as low cost.

Description

A kind of anchor device that is used for prestressed fiber cloth reinforced concrete structure

[technical field]

The utility model relates to building field, particularly be the consolidation of concrete structure method.

[background technology]

The conventional method of reinforced steel concrete structure has: steel bonding plate method, enlarged cross section method, stainless steel twisted wire method etc.They all exist reinforcing bar, steel plate easy-to-rust, and construction is complicated, and labour intensity is big, and punching has obvious deficiencies such as damage to structure.The unresolved reinforcing bar of tradition reinforcement means, steel plate corrosion problem need research new reinforcement material and technology.

In recent years, the reinforcement means that pastes cloth outward little owing to corrosion-resistant, convenient and quick construction, deadweight, do not take advantages such as usage space and become an emerging reinforcing technique.When using non-prestressed fiber cloth reinforced concrete flexural member, cloth had been given play to the intensity less than 20% when reinforcing bar was brought into play intensity fully, was difficult to suppress the distortion of structure and the development in crack.The high-intensity characteristics of cloth are only just given full play to after the main muscle surrender in beam, and before main muscle surrender, the cloth role is limited.Therefore, it is not fairly obvious to cracking load and the yield load effect that raising is reinforced member, and is limited at the performance improvement of operational phase to flexural member.In order more fully and reasonably to utilize the high-intensity characteristics of cloth, obtain better consolidation effect, carrying out prestressed reinforcement is valid approach.The member of prestressed reinforcement cloth before bearing load has just been brought into play suitable intensity, has both effectively utilized the high strength of cloth, can suppress the development in deformation of members and crack again, thereby can improve the performance of member under the service load effect.

It is a very novel reinforcing technique that the pre-stress FRP sheet material is reinforced flexural member.The prestress system that has developed at present has: (1) allowed flexural member play antiarch before pasting non-prestressed fibre sheet material, pasted fibre sheet material then, discharged antiarch, thereby made fibre sheet material produce prestressing force.The prestressing force level that this kind method produces is lower.(2) by the pre-pretensioning fibre sheet material of outside reaction frame, paste then on the member of reinforcing, treat that maintenance finishes after, cut off fibre sheet material at component ends and put and open, strenthening member is applied prestressing force.(3) permanent ground tackle is set in strenthening member, fibre sheet material carries out stretch-draw with strenthening member itself as reaction frame, sticks on the member after stretch-draw finishes, and ground tackle is retained in original position.In order to improve initial prestressing force level, should study of the effective anchoring measure of pre-stress FRP sheet material at beam-ends.Anchoring measure commonly used is at beam-ends u tie to be set, it can prevent more effectively that pre-stress FRP cloth from not destroying in beam-ends generation anchoring bond, thereby can improve initial prestressing force level to a certain extent, this kind method is adopted by domestic and international many scholars, and for example the blade row of the Wu Zhishen of Japan professor, China is flat, professor Shang Shouping etc.; Another effective anchoring measure is that nonvolatil ground tackle is set on beam, this kind mode does not need outside counter-force frame system, and carry out stretch-draw by the counter-force that reinforcement self provides, the shear strain of adhered layer in the time of can reducing prestressing force like this and put, thereby reduced the shearing that passes to concrete surface, effectively prevent reinforcement generation fibre sheet material stripping damage, the intensity of FRP sheet material can be given full play of, and it is more suitable for reinforcing on-site construction operations.For example, people such as Canadian Wight have studied the permanent ground tackle of circular bar shape and the anchoring process thereof of prestressed carbon cloth; The people such as Kojima of Japan have studied the steel pipe type ground tackle system and the anchoring process thereof of pre-stressed carbon fiber plate.

The u tie anchoring process construction period is long, and the tensioning equipment service efficiency is low, and anchoring effect has certain limit.Permanent ground tackle of circular bar shape and anchoring process thereof, the meeting stress is concentrated and FRP cloth is destroyed too early at the ground tackle place, and the high characteristic of FRP cloth tensile strength is fully used.Steel pipe type ground tackle cost height, its anchoring process can damage the reinforcement base concrete, and construction precision requires very high, is not suitable for structures such as reinforced concrete box beam and concrete slab.

[summary of the invention]

The purpose of this utility model provides a kind ofly can give full play to the high material behavior of cloth tensile strength, and improves the anchor device of reinforced concrete structure in the performance of service load effect.

The technical solution adopted in the utility model is: a kind of anchor device that is used for prestressed fiber cloth reinforced concrete structure, comprise fixed part, movable part and the screw rod that is connected both, fixed part is fixed on concrete surface, cloth is pasted on the surface that movable part and concrete surface are adjacent, one end of screw rod is connected and fixed portion, the other end connects movable part, and can regulate fixed part and movable part distance between the two, another surface of movable part is equipped with depression bar, depression bar is fixed on concrete surface, the surperficial curved and polishing that depression bar contacts with movable part, the surface that depression bar can make movable part paste cloth is adjacent to concrete surface, and the prestressing force friction loss is little in the stretching process.

Further, the surface that movable part is used to paste cloth has the U-lag of intersection, to guarantee that cloth can be applied in high-caliber prestressing force.

In addition, fixed part is T-shaped, has preformed hole and stiffening rib, and movable part is L-shaped, welds the screw rod with certain-length at L shaped manomelia external surface, and the other end of screw rod inserts the preformed hole of fixed part and also nut is installed.

Advantage of the present utility model: the utility model makes the damage of concrete surface little, the control stress for prestressing that can guarantee pre-stressed fiber cloth reaches very high level, can guarantee that pre-stressed fiber cloth and concrete surface have reliable bonding, anchor device can permanently be retained on the ruggedized construction, prestressing force applies in the process and makes reaction frame with the anchor device support, after putting loss of prestress less, and whole anchor device simple structure, be convenient to construction application, with low cost.

[description of drawings]

Fig. 1 is the utility model anchor device schematic diagram

Fig. 2 is the utility model anchor device movable part and screw rod schematic diagram

Fig. 3 is the utility model anchor device depression bar schematic diagram

Fig. 4 is the utility model anchor device movable part lateral sectional view

[specific embodiment]

Now specify the utility model in conjunction with the accompanying drawings:

In the accompanying drawing, the 1st, fixed part, the 2nd, screw rod, the 3rd, movable part, the 4th, depression bar, the 5th, cloth, the 6th, expansion bolt, the 7th, U-lag.

Anchor device as shown in Figure 1, is made into movable part 3 L shaped, open U-lag 7 in L shaped long limb external surface intersection, as shown in Figure 4, so that paste cloth 5, weld screw rod 2 at L shaped manomelia external surface with certain-length, as shown in Figure 2, so that stretch-draw and mooring anchor fixing apparatus.When the concrete surface of reinforced structure is fixed this anchor device, at first a T steel support that has preformed hole and a stiffening rib both fixed part 1 is fixed on concrete surface by expansion bolt 6, screw rod 2 with L shaped anchor device inserts the preformed hole of steel bracket and nut is installed then, arc section depression bar 4 is installed in the long limb inner surface outside at L shaped anchor device, and depression bar 4 is fixed on the concrete by expansion bolt 6.The arc-shaped outer surface of depression bar 4 as shown in Figure 3, needs polishing, the frictional force when reducing cloth stretch-draw between depression bar and the anchor device, thus reduce loss of prestress; Depression bar 4 will have enough bending rigidities, to guarantee that the anchor device surface fully contacts all the time with concrete surface in stretching process, do not stick up commentaries on classics, thereby pre-stressed fiber cloth can fully be contacted with concrete surface, guarantee sticking Quality because of the off-centre of stretching force.

Use the anchoring process of above-mentioned anchor device, comprise the steps: 1) paste cloth 5 at movable part 3 in advance; 2) fixed part 1 is fixed on concrete surface to be reinforced; 3) 2 one ends of the screw rod on the movable part 3 are inserted the preformed hole of fixed part 1 and nut is installed; 4) depression bar 4 is installed, is made movable part 3 contact (not plus-pressure) with concrete surface; 5) adjusting nut applies prestressing force (or using tensioning equipment to carry out stretch-draw with fixed part as reaction frame, stretch-draw clamp nut after the proof stress); 6) fastening depression bar 4.

Embodiment:

The wide 160mm of L shaped anchor device, the long 180mm of long limb, thick 10mm, the long 45mm of manomelia, thick 35mm open U-lag and paste aryl fiber cloth in long limb external surface intersection, are the screw rod of 18mm at the long 240mm of manomelia outside welding, diameter; The long 250mm of arc section depression bar, radius 25mm, the arc-shaped outer surface polishing, preformed hole center to center distance is that 200mm, clear distance are 170mm; The long 220mm in the T steel support edge of a wing, wide 60mm, thick 15mm, the wide 100mm of web, high 60mm, thick 10mm, the thick 10mm of stiffening rib.Using expansion bolt fixedly T steel support and arc section depression bar on concrete slab, is that reaction frame carries out stretch-draw with the T steel support, and the nut that stretch-draw is tightened on the anchor device screw rod after the proof stress is fixed, and puts then and opens.

Claims

1, a kind of anchor device that is used for prestressed fiber cloth reinforced concrete structure, comprise fixed part, movable part and be connected both screw rod, fixed part is fixed on concrete surface, cloth is pasted on the surface that movable part and concrete surface are adjacent, one end of screw rod is connected and fixed portion, the other end connects movable part, and can regulate fixed part and movable part distance between the two, another surface of movable part is equipped with depression bar, depression bar is fixed on concrete surface, it is characterized in that: the surperficial curved and polishing that depression bar contacts with movable part.

2, the anchor device that is used for prestressed fiber cloth reinforced concrete structure according to claim 1 is characterized in that: the surface that movable part is used to paste cloth has the U-lag of intersection.

3, the anchor device that is used for prestressed fiber cloth reinforced concrete structure according to claim 1 and 2, it is characterized in that: fixed part is T-shaped, have preformed hole and stiffening rib, movable part is L-shaped, weld the screw rod with certain-length at L shaped manomelia external surface, the other end of screw rod inserts the preformed hole of fixed part and also nut is installed.