CN110284500B - Quick and simple compensation tensioning construction method for anchor cable - Google Patents

Quick and simple compensation tensioning construction method for anchor cable Download PDF

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Publication number
CN110284500B
CN110284500B CN201910544780.9A CN201910544780A CN110284500B CN 110284500 B CN110284500 B CN 110284500B CN 201910544780 A CN201910544780 A CN 201910544780A CN 110284500 B CN110284500 B CN 110284500B
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unit
anchor cable
load
calculating
steel strand
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CN110284500A (en
Inventor
李友华
龚世柒
汪文亮
陈伟
孟德志
李英
江谊园
姜华
邓富扬
易湘华
罗勇
曾磊
张俊霞
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China Gezhouba Group Three Gorges Construction Engineering Co Ltd
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China Gezhouba Group Three Gorges Construction Engineering Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/121—Construction of stressing jacks

Abstract

A quick and simple compensation tensioning construction method for an anchor cable is characterized in that a quick compensation tensioning construction technology is applied, differential load calculation is carried out on each unit and the final shortest unit, and steel strands of the unit are compensated and tensioned in place at one time during tensioning. The number of the steel strands is small in each time of tensioning, and the operation is simple, convenient and quick. The compensation tensioning program can be used for firstly lengthening the unit and then shortening the unit, and can also be used for firstly shortening the unit and then lengthening the unit, so that the method is very flexible and convenient.

Description

Quick and simple compensation tensioning construction method for anchor cable
Technical Field
The invention relates to the field of anchoring engineering, in particular to a quick and simple compensation tensioning construction method for an anchor cable.
Background
Pressure dispersion type anchor rope is load dispersion type anchor rope promptly, and the anchor rope structure is: the same anchor cable is divided into a plurality of units, each unit is composed of 2-3 steel strand bundles, and the length of each steel strand is decreased progressively (or increased progressively). The pressure dispersion type anchor cable needs to be subjected to load compensation tensioning in advance due to different lengths of the steel strands of each unit during tensioning so as to eliminate load difference caused by different lengths of the steel strands of each unit and enable the steel strands of each unit to be in the same stress state in the final locking state.
The traditional anchor cable compensation tensioning construction method comprises the following steps: taking five units (L1 & gtL 2 & gtL 3 & gtL 4 & gtL 5), and 3 bundles of steel strands per unit as an example, the compensation tension method adopted in construction is described as follows: firstly, calculating the differential load of the anchor cables of the first unit and the second unit, and then performing compensation tensioning on the first unit according to the corresponding differential load; calculating the differential load of the anchor cables of the second unit and the third unit, and then performing compensation tensioning on the first unit and the second unit according to the corresponding differential load; calculating the differential load of the anchor cables of the third unit and the fourth unit, and performing compensation tensioning on the first unit, the second unit and the third unit according to the corresponding differential load; finally, calculating the differential load of the anchor cables of the fourth unit and the fifth unit, and then performing compensation tensioning on the first unit, the second unit, the third unit and the fourth unit according to the corresponding differential load; when the method is used for compensation tensioning, each unit is tensioned, differential load calculation is carried out on the unit and the previous unit which is shorter than the unit, and all steel strand bundles with the length exceeding the unit need to be tensioned and compensated again during tensioning. The operation is relatively complicated. The compensation tensioning program must be strictly controlled to operate according to a first long unit and a second short unit, and the operation flexibility is poor.
Disclosure of Invention
The invention mainly aims to provide a quick and simple anchor cable compensation tensioning construction method, which solves the problems of relatively complex and tedious operation and poor operation flexibility of the traditional anchor cable compensation tensioning construction method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an anchor cable quick and simple compensation tensioning construction method comprises the following steps: and (4) calculating the differential load of each unit and the final shortest unit, and compensating and tensioning the steel strand of the unit in place at one time during tensioning.
The method specifically comprises the following steps:
s1, calculating the differential load of the first unit anchor cable and the fifth unit anchor cable, and then performing compensation tensioning on the first unit anchor cable according to the corresponding differential load;
s2, calculating the differential load of the second unit anchor cable and the fifth unit anchor cable, and then performing compensation tensioning on the second unit anchor cable according to the corresponding differential load;
s3, calculating the differential load of the third unit anchor cable and the fifth unit anchor cable, and then performing compensation tensioning on the third unit anchor cable according to the corresponding differential load;
and s4, finally, calculating the differential load of the fourth unit anchor cable and the fifth unit anchor cable, and then performing compensation tensioning on the fourth unit anchor cable according to the corresponding differential load.
In a preferred scheme, the step of calculating the differential load of each unit and the final shortest unit is as follows:
firstly, calculating the load borne by each steel strand in a locked state;
P= Pn/N
calculating the length of each unit steel strand bundle
L=（IGeneral assembly-I1）+ I2
Calculating the elongation of each steel strand bundle in a locked state;
△L=PL/AE
calculating differential elongation;
△Lf-g=△Lf-△Lg
multiplying the differential load of the single steel strand by the number of the steel strands of the unit to obtain the differential load of the unit;
△Pf-g=△Lf-g×P/△Lf×3
in the formula:
n is the number of steel strands;
Pn locking a load;
e is the modulus of elasticity;
a is the sectional area of a single steel strand bundle, namely A = n pi r2N is the number of steel wires; r is the diameter of the steel wire;
Igeneral assemblyThe total length of the steel strand;
I1the length of the steel strand is decreased for each stage;
I2is the anchor backing plate thickness;
f is any unit except the final unit;
g is the final unit.
The invention provides a quick and simple compensation tensioning construction method for an anchor cable. The operation is simple, convenient and quick. The compensation tensioning program can be used for firstly lengthening the unit and then shortening the unit, and can also be used for firstly shortening the unit and then lengthening the unit, and the compensation tensioning program can be flexibly processed.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the mounting structure of the present invention;
in the figure: a first unit anchor cable 1; a second unit anchor cable 2; a third unit anchor cable 3; a fourth unit anchor cable 4; a fifth unit anchor cable 5; a pressure bearing plate 6.
Detailed Description
As shown in fig. 1-2, a rapid and simple compensation tensioning construction method for an anchor cable includes: and (4) calculating the differential load of each unit and the final shortest unit, and compensating and tensioning the steel strand of the unit in place at one time during tensioning. Comprises the following steps: calculating the difference load of the first unit anchor cable 1 and the fifth unit anchor cable 5, and then performing compensation tensioning on the first unit anchor cable 1 according to the corresponding difference load; calculating the difference load of the second unit anchor cable 2 and the fifth unit anchor cable 5, and performing compensation tensioning on the second unit anchor cable 2 according to the corresponding difference load; calculating the difference load of the third unit anchor cable 3 and the fifth unit anchor cable 5, and then performing compensation tensioning on the third unit anchor cable 3 according to the corresponding difference load; and finally, calculating the difference load of the fourth unit anchor cable 4 and the fifth unit anchor cable 5, and then performing compensation tensioning on the fourth unit anchor cable 4 according to the corresponding difference load.
The method is used for calculating the differential load of the rapid and simple compensation tensioning construction technology by taking a roof arch pressure dispersion type anchor cable of a factory building as an example. The parameters of the plant arch pressure dispersion type anchor cable are as follows: the steel strand model is 14 multiplied by 7 phi 5mm, 5 represents nominal straightA wire 7 phi 5 with a diameter of 5.0mm means that 7 such wires form a strand, and 14 means that 14 such strands form a bundle of cables. The general meaning is that a bundle of anchor cables consisting of 14 steel strands with 7 filaments (the diameter of each strand is 5mm) is divided into five units, the first unit of anchor cable 1 consists of 2 steel strand bundles, and the second to 5 th unit of anchor cables consist of 3 steel strand bundles. The orifice to anchor line first unit length is 25 m. The length of the steel strand decreases by 1.2m per unit, and the thickness of the anchor pier height and the anchor backing plate is 535 mm. The anchor cable is designed to lock load 1800 KN. The elastic modulus of the steel strand is measured according to the test value E =1.97 multiplied by 105 MPa。
The calculation idea is as follows:
in the above formula, A is the sectional area (7 phi 5mm) of a single steel strand bundle;
A= A=nπr2=7*3.14*2.52=137.445mm
e-the modulus of elasticity of the steel strand; the value E =1.97 × 10 according to the test5 MPa。
Firstly, calculating the load borne by each steel strand in a locked state;
P1=1800/14=128.57KN=128.57×103N
calculating the length of each unit steel strand bundle;
L1=25+0.535=25.535m=25.535×103mm
L2=23.8+0.535=24.335m=24.335×103mm
L3=22.6+0.535=23.135m=23.135×103mm
L4=21.4+0.535=21.935m=21.935×103mm
L5=20.2+0.535=+0.5320.735m=20.735×103mm
calculating the elongation of each steel strand bundle in a locked state;
△L1=P1L1/AE=128.57×103×25.535×103/（137.445×197×103）=121.25（mm）
△L2=P2L2/AE=128.57×103×24.335×103/（137.445×197×103）=115.55（mm）
△L3=P3L3/AE=128.57×103×23.935×103/（137.445×197×103）=109.85（mm）
△L4=P4L4/AE=128.57×103×21.935×103/（137.445×197×103）=104.16（mm）
△L5=P5L5/AE=128.57×103×20.735×103/（137.445×197×103）=98.46（mm）
fourthly, calculating the difference value between the elongation of each unit of steel strand bundle and the elongation of the shortest unit of steel strand bundle in the locked state, namely the differential elongation;
△L4-5=△L4-△L5=104.16-98.46=5.70mm
△L3-5=△L3-△L5=109.85-98.46=11.39mm
△L2-5=△L2-△L5=115.55-98.46=17.09mm
△L1-5=△L1-△L5=169.75-98.46=22.79mm
fifthly, the load required by stretching the unit steel strand for 1mm in the locked state is equal to the load borne by each steel strand in the locked state divided by the elongation of the unit steel strand, namely P1/delta Ln, wherein P1 is the load borne by each steel strand, and delta Ln is the elongation of the unit steel strand;
multiplying the elongation of the steel strand unit by the load required by stretching the steel strand unit by 1mm to calculate the differential load of the single steel strand, and multiplying the differential load of the single steel strand by the number of the steel strand unit to obtain the differential load of the unit;
△P4-5=△L4-5×P1/△L4×3=5.70×128.57/104.16×3
=7.0358×3=21.1074 KN
△P3-5=△L4-5×P1/△L4×3=11.39×128.57/109.85×3
=13.3310×3=39.993 KN
△P2-5=△L4-5×P1/△L4×3=17.09×128.57/115.55×3
=19.0157×3=57.0471 KN
△P1-5=△L4-5×P1/△L4×2=22.79×128.57/121.25×2
=24.1659×3=48.3318 KN
and (3) applying a rapid compensation tensioning construction technology, calculating the differential load of each unit and the final shortest unit, and compensating and tensioning the steel strand of the unit in place at one time during tensioning. The number of the steel strands is small in each time of tensioning, and the operation is simple, convenient and quick. The compensation tensioning program can be used for firstly lengthening the unit and then shortening the unit, and can also be used for firstly shortening the unit and then lengthening the unit, so that the method is very flexible and convenient.
The pressure dispersion type anchor cable rapid compensation tensioning construction technology is successfully applied to underground factory building engineering of the right bank of the white crane beach. By applying the technology, the compensation tensioning construction operation process is simplified, the construction difficulty is reduced, the construction efficiency is improved, the construction progress is accelerated, and the construction quality is also ensured. The construction period of the pressure dispersion type anchor cable of the underground factory building engineering of the right bank of the white crane beach is completed 2 months in advance, and the engineering quality of the anchor cable is excellent.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (2)

1. An anchor cable quick and simple compensation tensioning construction method comprises the following steps:
calculating the differential load of each unit and the final shortest unit, and compensating and tensioning the steel strand of the unit in place at one time during tensioning;
the method specifically comprises the following steps:
s1, calculating the difference load of the first unit anchor cable (1) and the fifth unit anchor cable (5), and then performing compensation tensioning on the first unit anchor cable (1) according to the corresponding difference load;
s2, calculating the difference load of the second unit anchor cable (2) and the fifth unit anchor cable (5), and then performing compensation tensioning on the second unit anchor cable (2) according to the corresponding difference load;
s3, calculating the difference load of the third unit anchor cable (3) and the fifth unit anchor cable (5), and then performing compensation tensioning on the third unit anchor cable (3) according to the corresponding difference load;
and s4, finally, calculating the differential load of the fourth unit anchor cable (4) and the fifth unit anchor cable (5), and then performing compensation tensioning on the fourth unit anchor cable (4) according to the corresponding differential load.
2. The anchor cable quick and simple compensation tensioning construction method according to claim 1, which is characterized in that: the step of calculating the differential load of each unit and the final shortest unit is as follows:
firstly, calculating the load borne by each steel strand in a locked state;
P= Pn/N
calculating the length of each unit steel strand bundle;
L=（Igeneral assembly-I1）+ I2
Calculating the elongation of each steel strand bundle in a locked state;
△L=PL/AE
calculating differential elongation;
△Lf-g=△Lf-△Lg
multiplying the differential load of the single steel strand by the number of the steel strands of the unit to obtain the differential load of the unit;
△Pf-g=△Lf-g×P/△Lf×3
in the formula:
n is the number of steel strands;
Pn locking a load;
e is the modulus of elasticity;
a is the sectional area of a single steel strand bundle, namely A = n pi r2N isThe number of steel wires; r is the diameter of the steel wire;
Igeneral assemblyThe total length of the steel strand;
I1the length of the steel strand is decreased for each stage;
I2is the thickness of the anchor backing plate
f is any unit except the final unit;
g is the final unit.
CN201910544780.9A 2019-06-21 2019-06-21 Quick and simple compensation tensioning construction method for anchor cable Active CN110284500B (en)

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CN110284500B true CN110284500B (en) 2021-06-08

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103938627B (en) * 2014-05-07 2016-03-02 中铁第四勘察设计院集团有限公司 A kind of method for stretching of scatteredload anchor rope
CN106149715B (en) * 2015-04-28 2018-03-20 中铁西北科学研究院有限公司深圳南方分院 Anchoring engineering stream line prestressing force compensates or method for stretching
KR101625428B1 (en) * 2016-01-26 2016-05-30 (주)이지이앤티 Permanent anchor having elastic supporter for differential load dispersion
CN106907169A (en) * 2017-03-23 2017-06-30 中铁隧道集团二处有限公司 A kind of pressure dispersing anchorage cable and its construction method in Super-large-section tunnel supporting

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