CN201331464Y

CN201331464Y - Circular fixture for prestress steel strand detection

Info

Publication number: CN201331464Y
Application number: CNU2008202369059U
Authority: CN
Inventors: 薛文虎; 华建祥; 严士兴; 陶建春; 许燕杰
Original assignee: JIANGYIN FASTEN STEEL PRODUCTS CO Ltd
Current assignee: JIANGYIN FASTEN STEEL PRODUCTS CO Ltd
Priority date: 2008-12-30
Filing date: 2008-12-30
Publication date: 2009-10-21
Anticipated expiration: 2018-12-30

Abstract

The utility model relates to a circular fixture for prestress steel strand detection, which is applied to the tension test machine of a prestress steel strand. The circular fixture consists of a left half fixture (1.1) and a right half fixture (1.2) which are abutted with each other and are arranged on the left and right symmetrically; the middle part of the clamping surface of the left half fixture (1.1) and the right half fixture (1.2) is provided with a semicircular long socket (1.3) which is internally provided with transverse jagged serrations. The fixture is capable of finishing the experiment test exactly, and can not increase the experiment cost and the experiment workload; and the sanitation of the place is good.

Description

Prestress wire detects uses circular clamp

(1) technical field

The utility model relates to a kind of tension of steel strand test jaw grip device.Be applied on the prestress wire tension tester.Belong to tension of steel strand testing machine component technology field.

(2) background technology

The prestress wire tension tester is to be used for mechanical property by whole steel strand wires of GB GB/T228 test, measures the indexs such as maximum, force, regulation disproportional stretching force, maximum, force percentage of total elongation, elastic modulus of steel strand wires.Prestress wire is formed by seven steel wires twisted under the high speed rotating of wire twisting machine, and its cross-sectional structure as shown in Figure 1.Under certain tension force condition, again after intermediate frequency furnace induction heating and this stabilization processes of water quench, obtain the underrelaxation performance.According to standard GB/T5224-2003, in anchor clamps or near anchor clamps, rupture for avoiding sample at duration of test, must use suitable anchor clamps.Tension of steel strand testing machine jaw grip device structure diagram is seen Fig. 2.Tension of steel strand testing machine jaw anchor clamps principle of work summary: tension tester jaw anchor clamps mainly by push rod (adding pallet) 3, card pull 4, anchor clamps 1 and steel strand wires 2 form.As seen from Figure 2, after steel strand wires 2 are placed in the anchor clamps, push rod (adding pallet) pushes away for 3 times and push card is pulled 4 and moved down, drive the clamp steel strand wires, tension tester drives whole Fig. 2 device by hydraulic loaded and upwards slowly moves (bottom and Fig. 2 symmetrical mounting keep shift invariant), steel strand wires are tight by stretch-draw, and continue evenly to load, and broken until steel strand wires.Because the steel strand wires maximum, force of measuring is generally very big, be example with the steel strand wires of 15.24mm specification 1860MPa, its maximum, force reaches more than the 265kN.Traditional tension of steel strand grip of testing machine is seen Fig. 3,4, generally adopts V-type groove anchor clamps (having horizontal sawtooth shape serration in the groove).In the process of the test, anchor clamps clamping steel strand wires place is the line contact, the easily slight slippage of the anchor clamps at its two ends and steel strand wires clamping face, the outer six roots of sensation silk of steel strand wires unbalance stress etc., fracture (steel strand wires maximum, force, maximum, force percentage of total elongation are generally not up to standard) in advance takes place in steel strand wires easily, all will produce appreciable impact, even can the twisted pair wire mechanical property do the judgement that makes mistake test findings.For overcoming above-mentioned deficiency, the general employing filled up aluminium flake on anchor clamps V-type groove, smear wet emery at the steel strand wires two ends, make aluminium flake closely wrap up steel strand wires, and the friction force of increase aluminium flake and steel strand wires, the outer six roots of sensation silk of steel strand wires is stressed evenly, so just is not prone to fracture of wire in advance, and test findings can objective reality reflection twisted wire mechanical property.Adopt said method, detect, both can increase experimentation cost, increased the experiment work amount again, and on-site sanitation can be relatively poor though can accurately finish test.

(3) summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, provide a kind of and can accurately finish test and detect, can not increase experimentation cost and experiment work amount again, and the good prestress wire of on-site sanitation detects and uses circular clamp.

The purpose of this utility model is achieved in that a kind of prestress wire detection circular clamp, by involuting about a left side half anchor clamps and right half anchor clamps, a described left side half anchor clamps and right half anchor clamps are symmetrically arranged, be provided with a semicircle long recess in the middle of the clamping face of a left side half anchor clamps and right half anchor clamps, have horizontal sawtooth shape serration in the groove.Be used to increase anchor clamps and twisted wire skin-friction force.

Described semicircle anchor clamps, be similar to " face " contact when making the clamping of steel strand wires two ends, the anchor clamps at its two ends and twisted wire clamping face be easy glide not, six of steel strand wires two end surfaces are stressed even, bond stress is strong, it is disconnected in advance that the tensile test process is not prone to monofilament, test findings can reflect the twisted wire mechanical property by objective reality, avoid of the erroneous judgement of invalid test findings to the steel strand wires mechanical property, do not use aluminium flake and emery between anchor clamps groove and the twisted wire, it is about 50% to reduce experimentation cost, easy and simple to handle, it is about 20% to increase work efficiency, and improves the testing ground hygienic conditions.

(4) description of drawings

The prestress wire cross-sectional structure synoptic diagram that Fig. 1 relates to for the utility model.

The tension of steel strand testing machine jaw grip device structure diagram that Fig. 2 relates to for the utility model.

Fig. 3 is traditional tension of steel strand grip of testing machine structure diagram.

Fig. 4 is left half a clamp structure sketch among Fig. 3.

Fig. 5 detects the cross-sectional structure synoptic diagram of using circular clamp for the utility model prestress wire.

Fig. 6 is left half a clamp structure sketch among Fig. 5.

Reference numeral among the figure:

Anchor clamps 1, steel strand wires 2, push rod (adding pallet) 3, card pull 4; A left side half anchor clamps 1.1, right half anchor clamps 1.2, semicircle long recess 1.3.

(5) embodiment

Referring to Fig. 5～6, the prestress wire that the utility model relates to detects and uses circular clamp, is involuted by a left side half anchor clamps 1.1 and right half anchor clamps about 1.2.A described left side half anchor clamps 1.1 and right half anchor clamps 1.2 are symmetrically arranged, and are provided with a semicircle long recess 1.3 in the middle of the clamping face of left half anchor clamps 1.1 and right half anchor clamps 1.2, have horizontal sawtooth shape serration in the groove.

Principle of work:

Described anchor clamps mainly are to be used for the clamping steel strand wires and to keep one.The direct clamping steel strand wires 2 of anchor clamps, along with testing machine loads steel strand wires, whole Fig. 2 device upwards slowly moves (bottom and Fig. 2 symmetrical mounting keep shift invariant), and steel strand wires are tight by stretch-draw, and continue evenly to load, and broken until steel strand wires.

Claims

1, a kind of prestress wire detects and uses circular clamp, it is characterized in that involuting about described anchor clamps are by a left side half anchor clamps (1.1) and right half anchor clamps (1.2), a described left side half anchor clamps (1.1) and right half anchor clamps (1.2) are symmetrically arranged, be provided with a semicircle long recess (1.3) in the middle of the clamping face of a left side half anchor clamps (1.1) and right half anchor clamps (1.2), have horizontal sawtooth shape serration in the semicircle long recess (1.3).