CN201671232U

CN201671232U - Large-diameter steel strand anchoring device

Info

Publication number: CN201671232U
Application number: CN201020196644XU
Authority: CN
Inventors: 陈茜; 唐茂; 梅治乾; 刘建英; 朱莹; 张清杰
Original assignee: LIUZHOU QIUMU PRESTRESSED MACHINERY CO Ltd; CABR Technology Co Ltd
Current assignee: LIUZHOU QIUMU PRESTRESSED MACHINERY CO Ltd; CABR Technology Co Ltd
Priority date: 2010-05-20
Filing date: 2010-05-20
Publication date: 2010-12-15
Anticipated expiration: 2020-05-20

Abstract

The utility model discloses a large-diameter steel strand anchoring device which relates to the technical field of pre-stress anchoring devices. As for the large-diameter steel strand anchoring device, the female cone angle of an anchor hole of a working anchor plate is 2 Alpha of 11 to 15 degrees; the taper difference between a taper hole of the anchor plate and the outer side surface of a clamping piece arranged in the taper hole is A which is larger than or equal to 30 minutes and smaller than or equal to 1 degree; the teeth of the clamping surface of the working clamping piece are saw-toothed, and the addendum angle of the teeth is Gamma which is larger than or equal to 76 degrees and smaller than or equal to 78 degrees; the angle at the front edge of the teeth is Beta which is larger than or equal to 69 degrees and smaller than or equal to 71 degrees; the pitch among teeth is t which is larger than or equal to 1.25 millimeters and larger than or equal to 1.5 millimeters; an inner hole at the small end of the clamping piece is provided with an opening with a larger outer end and a smaller inner end; the angle of the opening is Theta which is larger than or equal to 5 degrees and smaller than or equal to 6 degrees; and the length of the opening part is Lota which is larger than or equal to 11 millimeters and smaller than or equal to 14 millimeters. The large-diameter steel strand anchoring device has the advantages of being capable of preventing the steel strand from being damaged or broken at the inlet of the clamping piece when the steel strand is stretched, and being capable of guaranteeing excellent performances of static load and fatigue resistance.

Description

Major diameter steel strand anchor device

Technical field

The utility model relates to the prestressed anchor technical field, especially a kind of being used at prestressing force worker and the major diameter steel strand anchorage of construction to the end anchorage of presstressed reinforcing steel.

Background technology

Along with structure design needs and the progress of material science and the continuous innovation of construction technology, be the adaptation large span, the requirement of the prestressed structure of heavy load, prestress wire is just gradually to the major diameter direction, the high strength direction develops, to reduce the quantity of steel strand in every bundle presstressed reinforcing steel.And the diameter of the currently used prestress wire of China mostly is Φ 12.7, Φ 15.2mm, and intensity is the 1860MPa level, still lacks the large-diameter and high-strength steel strand in application in engineering.For this reason, Tianjin steel wire wirerope group success development and production the steel strand of 1 * 7-Φ 21.6mm, intensity 1770MPa level and intensity 1860MPa level, filled up a domestic blank aspect the production of major diameter steel strand, but the prestressed anchor that is used for the above-mentioned new product of anchoring adopts existing ground tackle can't guarantee anchoring to this steel strand.

Summary of the invention

Problem to be solved in the utility model provides a kind of major diameter steel strand anchor device, in order to solve the problem of steel strand that existing ground tackle can not fine anchoring strength be 1 * 7-Ф 21.6mm specification of 1860MPa and following intensity rank.

In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is: include anchor slab and steel strand are installed in intermediate plate in the described anchor slab, female cone angle 2 α of described work anchor slab anchor hole are 11 °～15 °, the taper hole of described anchor slab is A with the difference of the tapering that is contained in the described intermediate plate lateral surface in this taper hole, 30 '≤A≤1 °;

The tooth form of described work clip sheet clamping face is a zigzag, and the addendum angle of described tooth is γ, 76 °≤γ≤78 °; The angle, forward position of described tooth is β, 69 °≤β≤71 °; The tooth distance of described tooth is t, 1.25 millimeters≤t≤1.5 millimeters;

The endoporus of described intermediate plate small end is having the little opening of imperial palace outside a section, and the angular aperture of this opening is θ, 5.5 °≤θ≤6 °; The length of this opening portion is L,11 millimeters≤ l≤ 14 millimeters.

Scheme is more specifically: described intermediate plate can connect to as a whole intermediate plate by its book muscle by four sheet parts, and except that the muscle portion of mutual binding, these four tabs are provided with shrinkage joint between dividing; The roughness of the inner surface of described anchor slab taper hole and the conical outer surface of described intermediate plate is=K 1.6≤K≤0.8; The case hardness of described intermediate plate is H, HRA80≤H≤HRA85.

Owing to adopted technique scheme, the advantage that the utlity model has is:

1, intermediate plate β, γ angle and tooth are selected and are cooperated apart from the reasonable range of t, guarantee that thread to the degree of depth that steel strand embed, can satisfy the follow-up anchoring, and the needs of stripped thread do not take place, and are convenient to steel strand again repeatedly during stretch-draw, and intermediate plate unclamps, and steel strand withdraw from; The tooth of only preapring for an unfavorable turn of events was again simultaneously nipped and was caused the steel strand premature failure deeply; Intermediate plate inlet θ and conical surface length lAdopt parameter of the present utility model to cooperate, can prevent that not only steel strand from the phenomenon that steel strand are crushed or bite broken in the intermediate plate entrance taking place when stretch-draw, and can guarantee the premium properties of ground tackle static load and antifatigue.

2, because four sheet parts connect to as a whole intermediate plate by its book muscle, except that the muscle portion of mutual binding, these four tabs are provided with shrinkage joint between dividing, both sides formula intermediate plate cornerite is big, near 180 °, increased and steel strand between contact area, each piece intermediate plate can be stuck on the steel strand, strengthened frictional force, adopted wire loop together simultaneously, improved its follow-up performance two intermediate plate hoops.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is an instrument intermediate plate tooth form schematic diagram.

Fig. 3 is an instrument intermediate plate schematic diagram.

Fig. 4 is the right view of Fig. 3.

Fig. 5 is the structural representation of work anchor slab.

The specific embodiment

Below in conjunction with the accompanying drawing example, the utility model is described in further detail:

As Fig. 1, Fig. 2, Fig. 3 and the utility model shown in Figure 5, it includes anchor slab 1 and steel strand 2 is installed in intermediate plate 3 in the anchor slab 1, female cone angle 2 α of work anchor slab anchor hole are 11 °, the taper hole of anchor slab is A with the difference of the tapering that is contained in the described intermediate plate lateral surface in this taper hole, and A=1 °, the tooth form of work clip sheet 3 clamping faces is a zigzag, the addendum angle of tooth is γ, γ is 76 °, and the angle, forward position of tooth is β, and β is 69 °, the tooth distance of tooth is t, t=1.25., tooth form is a zigzag, and the intermediate plate pawl can prevent that intermediate plate from skidding off, be convenient to the intermediate plate follow-up, work clip sheet β, γ angle and tooth are selected and cooperation apart from the reasonable range of t, guarantee that thread to the degree of depth that the major diameter steel strand embed, can satisfy the follow-up anchoring, the needs of stripped thread do not take place, be convenient to the major diameter steel strand again repeatedly during stretch-draw, intermediate plate unclamps, and steel strand withdraw from; The endoporus of intermediate plate small end is having the little opening of imperial palace outside a section, and the angular aperture of this opening is θ, θ=5.5 °, and the length of this opening portion is L, the l=11 millimeter,Intermediate plate inlet θ and conical surface length lAdopted these two parameters to cooperate, can prevent that not only the major diameter steel strand from the phenomenon that steel strand are crushed or bite broken in the intermediate plate entrance taking place when stretch-draw, and can guarantee the premium properties of ground tackle static load and antifatigue.

As shown in Figure 4, work clip sheet 3 connects to as a whole intermediate plate by four sheet parts 3.1 by its book muscle, and except that the muscle portion of mutual binding, these four tabs are provided with shrinkage joint 3.2 between dividing; The roughness of the inner surface of anchor slab 1 taper hole and the conical outer surface of work clip sheet 3 is=K, K=1.6, both sides formula intermediate plate cornerite is big, near 180 °, increased and steel strand between contact area, each piece intermediate plate can be stuck on the steel strand, strengthened frictional force, adopt wire loop with two intermediate plate hoops together simultaneously, improve its follow-up performance, the case hardness of intermediate plate is H, H=HRA85, the tooth of intermediate plate just can be bitten high-intensity steel strand like this, and the intermediate plate core has good toughness simultaneously, and intermediate plate can be by distortion to adapt to the wedged hole of irregular profile of steel strand and anchor slab like this.

Claims

1. major diameter steel strand anchor device includes anchor slab and steel strand is installed in intermediate plate in the described anchor slab, it is characterized in that:

Female cone angle 2 α of A, described work anchor slab anchor hole are 11 °～15 °, and the taper hole of described anchor slab is A with the difference of the tapering that is contained in the described intermediate plate lateral surface in this taper hole, 30 '≤A≤1 °;

The tooth form of B, described work clip sheet clamping face is a zigzag, and the addendum angle of described tooth is γ, 76 °≤γ≤78 °; The angle, forward position of described tooth is β, 69 °≤β≤71 °; The tooth distance of described tooth is t, 1.25 millimeters≤t≤1.5 millimeters;

The endoporus of C, described intermediate plate small end is having the little opening of imperial palace outside a section, and the angular aperture of this opening is θ, 5.5 °≤θ≤6 °; The length of this opening portion is L,11 millimeters≤ l≤ 14 millimeters.

2. major diameter steel strand anchor device according to claim 1 is characterized in that: described intermediate plate connects to as a whole intermediate plate by four sheet parts by its book muscle, and except that the muscle portion of mutual binding, these four tabs are provided with shrinkage joint between dividing.

3. major diameter steel strand anchor device according to claim 1 and 2 is characterized in that: the roughness of the inner surface of described anchor slab taper hole and the conical outer surface of described intermediate plate is K, and K is 0.8 or 1.6; The case hardness of described intermediate plate is H, HRA80≤H≤HRA85.