CN200943288Y

CN200943288Y - Prestress FRP tendon wedge-bush type anchorage

Info

Publication number: CN200943288Y
Application number: CN 200620119110
Authority: CN
Inventors: 杜修力; 詹界东; 邓宗才
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2006-08-15
Filing date: 2006-08-15
Publication date: 2007-09-05
Anticipated expiration: 2016-08-15

Abstract

The utility model relates to a preload-stressed FRP clip/jacket-type anchor device. It is mainly applies to the preload stress field of construction projects. The currently-used push-type preload stress strand anchor device has no spontaneous clips, cannot anchor tightly or apply to such FRP tendon/cable with low strength in resisting cut or compression. The utility model consists of preload stress tendon (1), jacket (2), anchor ring (3) and clip (4). The said preload stress tendon is cover by a soft metallic jacket (2), while the clip (4) directly holds on the jacket (2) covering the preload stress tendon (1). The utility model's soft metallic jacket prevents clips from contacting FRP tendon/cable and doing harm to the surface of the latter. The soft metallic jacket also reduces clip's pressure on the FRP tendon/cable and stops clip from breaking the FRP tendon/cable. Moreover, the clip can better match the anchor and make it more tightly. The product also has the advantages of small physical dimension and weight and convenience for construction.

Description

Pre-stress FRP muscle intermediate plate-socket type ground tackle

Technical field:

A kind of pre-stress FRP muscle intermediate plate of the utility model-socket type ground tackle is mainly used in the prestressed anchor field in the building operations, particularly relates to a kind of and FRP muscle or the matching used intermediate plate of rope-socket type ground tackle.

Background technology

The prestress wire of presstressed reinforcing steel consumption maximum in the market, existing prestress wire intermediate plate ground tackle be as shown in Figure 3: this anchor device is made up of common prestress wire, intermediate plate and anchor cup; Intermediate plate clamping steel strand, the male cone (strobilus masculinus) by intermediate plate matches with the internal taper hole of anchor ring, but steel strand drive the intermediate plate follow-up, thereby make intermediate plate produce a very big chucking power to steel strand when stressed, and steel strand anchor in the anchor ring taper hole is tight.In use also there are many problems in prestress wire, and wherein the most outstanding is endurance issues, and especially the endurance quality in particular surroundings (as marine environment) is poor.Development along with prestressing technique, the home and abroad is set about research and is replaced prestress wire with FRP muscle or rope, and existing prestress wire intermediate plate ground tackle technology is applied to prestressing force non-metallic fibers muscle---when being called the pre-stress FRP muscle, exist following deficiency:

One: the shear strength of FRP muscle or rope is lower, and the intermediate plate thread form is thinner, and the intermediate plate tooth directly contacts with FRP muscle or rope, when stressed, may pull FRP muscle or rope surface, causes the stripped thread phenomenon;

Its two: the compressive strength of FRP muscle or rope is lower, under the powerful chucking power of intermediate plate, easily breaks FRP muscle or rope; Chucking power is at the anchorage zone skewness, and ground tackle taper hole small end easily produces the stress concentration phenomenon, and the steel strand higher to hardness can not exert an influence, but totally unfavorable to shear strength and compressive strength lower FRP muscle or rope.

Its three: intermediate plate mostly is 2～4 separate types, follows up asynchronous and to be difficult for anchor tight.

The utility model content

The technical problems to be solved in the utility model is: solve existing prestress wire intermediate plate ground tackle when clamping pre-stress FRP muscle or Suo Shouli, the intermediate plate tooth directly contacts with FRP muscle or rope, may pull FRP muscle or rope surface, causes the stripped thread phenomenon; Under the powerful chucking power of intermediate plate, easily break FRP muscle or rope; Chucking power is at the anchorage zone skewness, and the ground tackle taper hole brings out easy generation stress for a short time and concentrates; The separate type intermediate plate is difficult for the problem of aspect such as the tight phenomenon of follow-up anchor, and a kind of stripped thread phenomenon that both can avoid pulling FRP muscle or rope surface and cause is provided; Can avoid again chucking power excessive, produce the phenomenon that FRP muscle or rope were concentrated, broken to stress at anchorage zone skewness, ground tackle taper hole small end, and the intermediate plate anchor that easily follows up is tight, product design size and weight are little, the intermediate plate of easy construction-socket type ground tackle.

The technical scheme that solves the problems of the technologies described above is: 1. adopt soft metal sleeve (hardness HRB is less than 150), intermediate plate is not directly contacted with FRP muscle or rope, thereby reduced the pressure of intermediate plate to FRP muscle or rope; 2. adopt the varied angle method, promptly intermediate plate and anchor ring adopt different angles, and the intermediate plate tapering is greater than 1～5 ° of anchor ring tapering, thereby chucking power is evenly distributed at anchorage zone, have reduced stress and have concentrated; 3. adopt the monolithic intermediate plate of two ends intersection opening, avoid the intermediate plate follow-up asynchronous, it is tight to be difficult for anchor.

Its concrete structure is: a kind of pre-stress FRP muscle intermediate plate-socket type ground tackle, comprise presstressed reinforcing steel 1, intermediate plate 4 and anchor ring 3, it is characterized in that: described presstressed reinforcing steel is with soft metal sleeve 2 outward, intermediate plate 4 directly is clamped on presstressed reinforcing steel 1 sleeve 2 outward, described intermediate plate 4 is the monolithic intermediate plate of two ends intersection opening, and the tapering of its taper ratio anchor ring 3 is big 1～5 °.

Described presstressed reinforcing steel is carbon fibre bar, aramid fiber reinforced plastic bars, glass fiber muscle, pbo fiber muscle and so on prestressing force non-metallic fibers muscle.

In the use, when stretch-draw prestressing force non-metallic fibers muscle, the top anchor device roof pressure intermediate plate on vertically-displacable a thousand pieces of gold top, extruding and clamping soft metal sleeve, thereby prestressing force non-metallic fibers muscle is produced chucking power, prestressing force non-metallic fibers muscle anchor in the anchor ring taper hole is tight.Its advantage is as follows:

1. intermediate plate directly is clamped on the sleeve of the outer soft metal of presstressed reinforcing steel, does not directly contact with the nonmetal muscle of carbon fibre bar or rope and so on prestressing force, has reduced the pressure of intermediate plate to FRP muscle or rope, has avoided pulling FRP muscle or rope surface, causes the stripped thread phenomenon;

2. the angle difference between intermediate plate and the anchor ring (1～5 °) makes chucking power be evenly distributed at anchorage zone, has reduced stress and has concentrated, and avoids breaking FRP muscle or rope;

3. two ends intersect the monolithic intermediate plate of opening, avoid since intermediate plate follow up asynchronous produce be difficult for the tight phenomenon of anchor.

Prestressing force non-metallic fibers muscle weather excellent, antiseptic property are good, are difficult for producing corrosion, long service life, and it is more outstanding to be used for particular surroundings (as marine environment) effect; Good mechanical property such as prestressing force non-metallic fibers muscle has the tensile strength height, creep relaxation property and anti-fatigue performance are good has increased the security and stability of prestressed member, has improved the bulk life time of member; Prestressing force non-metallic fibers muscle has higher intensity-mass ratio, can reduce the deadweight of member widely; Be particularly useful for using in a large number on the engineering of bridge of drag-line; Carbon fibre bar, cables, aramid fiber reinforced plastic bars bending stiffness are low, and flexibility is good, is easy to reel, are convenient to the carrying of long rope and set up;

Description of drawings:

Fig. 1: the utility model pre-stress FRP muscle intermediate plate-socket type ground tackle structural representation;

Fig. 2: existing prestress wire intermediate plate ground tackle structural representation.

Reference numeral: 1, presstressed reinforcing steel, 2, sleeve, 3, anchor ring, 4, intermediate plate, 5, carbon fiber wire.

The specific embodiment:

Embodiment:

Pre-stress FRP muscle intermediate plate-socket type ground tackle, comprise presstressed reinforcing steel 1, intermediate plate 4 and anchor ring 3, it is characterized in that: described presstressed reinforcing steel is with soft metal sleeve 2 outward, intermediate plate directly is clamped on the surface of presstressed reinforcing steel outer sleeve, described presstressed reinforcing steel is the pre-stressed carbon fiber muscle, this carbon fibre bar can be single non-smooth gluten, above have screw thread, surface to be uneven, also can be around the cables that forms or claim the carbon fiber twisted wire by 7 diameters fine carbon muscle strand that is 1.5～5mm.Described sleeve is the soft metal sleeve.

As a kind of conversion of the utility model embodiment, described presstressed reinforcing steel can also be the prestressing force aramid fiber reinforced plastic bars, the glass fiber muscle, and pbo fiber muscle and so on prestressing force non-metallic fibers muscle can be wound with carbon fiber wire 5 on the described FRP muscle, also can not twine.

In the various embodiments described above, described anchor ring is meant single presstressed reinforcing steel ground tackle, is anchor slab for the many described anchor cups of presstressed reinforcing steel ground tackle.

Claims

1. pre-stress FRP muscle intermediate plate-socket type ground tackle, comprise presstressed reinforcing steel (1), intermediate plate (4) and anchor ring (3), it is characterized in that: described presstressed reinforcing steel is with soft metal sleeve (2) outward, and intermediate plate (4) directly is clamped on the outer sleeve (2) of presstressed reinforcing steel (1).

2. a kind of pre-stress FRP muscle intermediate plate according to claim 1-socket type ground tackle is characterized in that: described intermediate plate (4) is the monolithic intermediate plate of two ends intersection opening, and the tapering of its taper ratio anchor ring (3) is big 1～5 °.