CN114061402A - Method for measuring elongation of prestressed tendon - Google Patents
Method for measuring elongation of prestressed tendon Download PDFInfo
- Publication number
- CN114061402A CN114061402A CN202111395853.6A CN202111395853A CN114061402A CN 114061402 A CN114061402 A CN 114061402A CN 202111395853 A CN202111395853 A CN 202111395853A CN 114061402 A CN114061402 A CN 114061402A
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- China
- Prior art keywords
- steel ruler
- prestressed
- pointer
- straight steel
- prestressed tendon
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 210000002435 tendon Anatomy 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000000691 measurement method Methods 0.000 claims abstract description 6
- 239000011513 prestressed concrete Substances 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of measurement, in particular to a prestressed tendon elongation measurement method, which comprises the following steps: a plurality of steel ruler fixing brackets are fixed on the jacks; tensioning the prestressed tendons by using a working anchor, a limiting plate, a jack and a tool anchor; mounting a steel ruler on the bracket, wherein one end of the steel ruler is abutted against the prestressed concrete member, and the pointer is mounted on the prestressed tendon; tensioning the prestressed tendon to an initial stress value, and recording the numerical value indicated by a pointer on the straight steel ruler; tensioning the prestressed tendon to an initial stress value of two times, and recording the numerical value indicated by a pointer on the straight steel ruler; continuously tensioning the prestressed tendon to a design stress value, and recording the numerical value indicated by the pointer on the straight steel ruler; according to the recorded numerical values, calculating the stretching elongation value of the prestressed tendon; the method can accurately and rapidly measure the tension elongation value of the prestressed tendon, and has the advantages of safe measurement process and no potential safety hazard.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a prestressed tendon elongation measurement method.
Background
With the development of society, prestressed concrete structures are more and more, and when a prestressed tendon is tensioned by adopting a stress control method, the prestressed tendon is checked according to an elongation value. The difference value between the actual elongation value and the theoretical elongation value is in accordance with the design requirement; the design is random timing, the difference between the actual elongation value and the theoretical elongation value is controlled within +/-6%, otherwise, the tensioning is suspended, and the tensioning can be continued after the reason is found out and measures are taken, so that the accuracy of the elongation value is very important.
At present, the method for measuring the elongation of the prestressed tendon is to measure the jacking length of the jack, and generally adopts a manual steel ruler to measure manually, so that larger measurement errors and manual potential safety hazards exist.
Disclosure of Invention
The invention aims to solve the problems, and provides a prestressed tendon elongation measurement method capable of quickly and accurately measuring the elongation of a prestressed tendon.
The invention solves the problems and adopts the technical scheme that:
a prestressed tendon elongation measurement method comprises the following steps:
s1: a plurality of straight steel ruler fixing supports are fixed on the jack, are all positioned on the same axis of the jack and are equal in height;
s2: tensioning the prestressed tendons by using a working anchor, a limiting plate, a jack and a tool anchor;
s3: installing a straight steel ruler on a straight steel ruler fixing support, enabling one end of the straight steel ruler to abut against the prestressed concrete member, fixedly installing a pointer on the prestressed rib, and enabling one end of the pointer to point to the straight steel ruler;
s4: tensioning the prestressed tendon to an initial stress value, checking and recording a numerical value indicated by a pointer on the straight steel ruler, wherein the numerical value is D0;
s5: tensioning the prestressed tendons to the two times of the initial stress value, checking and recording the numerical value indicated by the pointer on the straight steel ruler, wherein the numerical value is D1;
s6: tensioning the prestressed tendons to a design stress value, checking and recording a numerical value indicated by a pointer on the straight steel ruler, wherein the numerical value is D2;
s7: and (3) calculating the tensile elongation value of the prestressed tendon according to the values recorded in S4-S6, wherein the tensile elongation value of the prestressed tendon is L, and L =2 (D1-D0) + D2-D1.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
the method can accurately and rapidly measure the tension elongation value of the prestressed tendon, and has the advantages of safe measurement process and no potential safety hazard.
Preferably, the further technical scheme of the invention is as follows:
the clear distance between the pointer and the tool anchor is 2-4 cm; the influence of the side slipping of the tool anchor is avoided, the waste caused by the longer extension of the prestressed tendon is avoided, and meanwhile, the safety problem caused by the excessively short extension of the prestressed tendon is also avoided.
Drawings
FIG. 1 is a schematic structural view of an embodiment of the present invention in use;
FIG. 2 is a schematic overall structure diagram of an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the fixing bracket for the straight steel ruler.
In the figure: a jack 1; a working anchor 2; a limiting plate 3; a tool anchor 4; a concrete member 5; a pre-stressed pipe 6; a prestressed tendon 7; a steel ruler fixing bracket 8; a steel straightedge 9; a pointer 10.
Detailed Description
The invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
As shown in fig. 1 to 3, a method for measuring the elongation of a tendon comprises the following steps:
s1: two straight steel ruler fixing brackets 8 are fixedly welded on the jack 1, and the two straight steel ruler fixing brackets 8 are both positioned on the same axis of the jack 1 and have equal height; the upper end of the straight steel ruler fixing support 8 is provided with a straight steel ruler mounting hole matched with the straight steel ruler, and the lower end of the straight steel ruler fixing support is provided with an arc-shaped mounting groove matched with the periphery of the jack 1.
S2: the prestressed tendons 7 in the prestressed pipe 6 are tensioned by using the working anchor 2, the limiting plate 3, the jack 1 and the tool anchor 4.
S3: installing a straight steel ruler 9 on a straight steel ruler fixing support 8, enabling one end of the straight steel ruler 9 to abut against the prestressed concrete member 5, fixing a pointer 10 on one prestressed rib 7 at one end of the tool anchor 4, enabling the distance between the pointer 10 and the tool anchor 4 to be 2cm, and enabling one end of the pointer 10 to point to the straight steel ruler 9; because of the prestressing tendons 7 stretches out the longer material loss of the length of tool anchor more, prestressing tendons 7 stretches out the length that the tool anchor can appear the condition that the prestressing force tensioning in-process tool anchor drops when short-term, cause the potential safety hazard, and simultaneously, the tool anchor is at the prestressing force tensioning in-process, can produce a little slip to the outside, so, pointer 10 is installed on prestressing tendons 7 apart from the position of tool anchor 4 about 2cm, the influence of tool anchor sideslip has both been avoided, the longer waste that produces of prestressing tendons 7 extension has been avoided again, the safety problem that prestressing tendons 7 extension short leads to has still been avoided.
S4: the tendon 7 is tensioned to the initial stress value and the value indicated by the pointer 10 on the straightedge 9 is checked and recorded as D0.
S5: the tendon 7 is tensioned to twice the initial stress value and the value indicated by the pointer 10 on the straightedge 9 is checked and recorded as D1.
S6: the tendon 7 is tensioned to the design stress value, and the numerical value indicated by the pointer 10 on the straightedge 9 is checked and recorded, and the numerical value is D2.
S7: and (3) calculating the tensile elongation value of the prestressed tendon 7 according to the values recorded in S4-S6, wherein the tensile elongation value of the prestressed tendon 7 is L, and L =2 (D1-D0) + D2-D1.
The method can accurately and rapidly measure the value of the stretching elongation of the prestressed tendon 7, and has safe measurement process and no potential safety hazard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (2)
1. A prestressed tendon elongation measurement method is characterized in that: comprises the following steps of (a) carrying out,
s1: a plurality of straight steel ruler fixing supports are fixed on the jack, are all positioned on the same axis of the jack and are equal in height;
s2: tensioning the prestressed tendons by using a working anchor, a limiting plate, a jack and a tool anchor;
s3: installing a straight steel ruler on a straight steel ruler fixing support, enabling one end of the straight steel ruler to abut against the prestressed concrete member, fixedly installing a pointer on the prestressed rib, and enabling one end of the pointer to point to the straight steel ruler;
s4: tensioning the prestressed tendon to an initial stress value, checking and recording a numerical value indicated by a pointer on the straight steel ruler, wherein the numerical value is D0;
s5: tensioning the prestressed tendons to the two times of the initial stress value, checking and recording the numerical value indicated by the pointer on the straight steel ruler, wherein the numerical value is D1;
s6: tensioning the prestressed tendons to a design stress value, checking and recording a numerical value indicated by a pointer on the straight steel ruler, wherein the numerical value is D2;
s7: and (3) calculating the tensile elongation value of the prestressed tendon according to the values recorded in S4-S6, wherein the tensile elongation value of the prestressed tendon is L, and L =2 (D1-D0) + D2-D1.
2. The tendon elongation measurement method according to claim 1, wherein: the clear distance between the pointer and the anchor of the tool is 2-4 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111395853.6A CN114061402A (en) | 2021-11-23 | 2021-11-23 | Method for measuring elongation of prestressed tendon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111395853.6A CN114061402A (en) | 2021-11-23 | 2021-11-23 | Method for measuring elongation of prestressed tendon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114061402A true CN114061402A (en) | 2022-02-18 |
Family
ID=80275485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111395853.6A Withdrawn CN114061402A (en) | 2021-11-23 | 2021-11-23 | Method for measuring elongation of prestressed tendon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114061402A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202501817U (en) * | 2012-04-17 | 2012-10-24 | 重庆亲禾预制品有限公司 | Device for measuring the tensioning extension amount of pre-stressed steel strand |
| CN202599295U (en) * | 2012-06-15 | 2012-12-12 | 中铁十局集团有限公司 | Tensioning extension value measurement device for prestress tensioning construction |
| CN103758352A (en) * | 2011-12-31 | 2014-04-30 | 常熟古建园林建设集团有限公司 | Tensioning method for pre-stress steel strand |
| CN208152587U (en) * | 2017-09-29 | 2018-11-27 | 上海二十冶建设有限公司 | Displacement straight steel ruler for stretch-draw jack |
-
2021
- 2021-11-23 CN CN202111395853.6A patent/CN114061402A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758352A (en) * | 2011-12-31 | 2014-04-30 | 常熟古建园林建设集团有限公司 | Tensioning method for pre-stress steel strand |
| CN202501817U (en) * | 2012-04-17 | 2012-10-24 | 重庆亲禾预制品有限公司 | Device for measuring the tensioning extension amount of pre-stressed steel strand |
| CN202599295U (en) * | 2012-06-15 | 2012-12-12 | 中铁十局集团有限公司 | Tensioning extension value measurement device for prestress tensioning construction |
| CN208152587U (en) * | 2017-09-29 | 2018-11-27 | 上海二十冶建设有限公司 | Displacement straight steel ruler for stretch-draw jack |
Non-Patent Citations (1)
| Title |
|---|
| 王景华;: "预应力钢绞线张拉伸长值量测方法的探讨", 铁道工程学报, no. 05 * |
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| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220218 |
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| WW01 | Invention patent application withdrawn after publication |