CN107144385B - The monitoring method of torque in a kind of bridge cantilever method symmetrical construction - Google Patents
The monitoring method of torque in a kind of bridge cantilever method symmetrical construction Download PDFInfo
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- CN107144385B CN107144385B CN201710366151.2A CN201710366151A CN107144385B CN 107144385 B CN107144385 B CN 107144385B CN 201710366151 A CN201710366151 A CN 201710366151A CN 107144385 B CN107144385 B CN 107144385B
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- temporary consolidation
- column
- strain
- consolidation column
- torque
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
Abstract
The present invention provides a kind of monitoring method of torque in bridge cantilever method symmetrical construction, belongs to technical field of bridge construction.This method obtains the load strain on temporary consolidation column by installing strain gauge on the bridge pier of temporary consolidation column, then according between symmetrical temporary consolidation column strain differential and distance calculate the torque during cantilever construction.The present invention solves the problems, such as torque measurement in cantilever method bridge construction process, provides reference for eccentric load control suffered in bridge construction process.
Description
Technical field
The present invention relates to technical field of bridge construction, a kind of monitoring of torque in bridge cantilever method symmetrical construction is particularly related to
Method.
Background technique
Box beam can be equivalent to Local Loads, the collective effect of balanced load and anti-symmetrical load under Under Eccentric Loading.
Torsion and distortion effect are generated under anti-symmetrical load effect.Guo Jinqiong, Fang Zhenzheng, Zheng Zhen " box beam design theory "
It is pointed out for concrete box girder in one book, work can reach by the lonitudinal warping direct stress that rigid torsion and cross section distortion generate
Carry the 24%~26% of the buckling direct stress generated with dead load collective effect.Therefore influence of the twisting action for box beam is not
It is negligible.
Currently, having through displacement monitoring the method for carrying out torsion monitoring in mechanical engineering field, and work as in this field
In, there has been no the method for bridge torque monitoring, therefore, it is necessary to a kind of experiment installations simply, can be carried out cantilever construction mistake
The method that torque is monitored in journey.
Summary of the invention
The present invention is the deficiency of torque monitoring during solving current cantilever construction, and it is symmetrical to provide a kind of bridge cantilever method
The monitoring method of torque in construction.
The method steps are as follows:
S1: the strain gauge of installation measurement temporary consolidation column axial strain on temporary consolidation column, and strain gauge is with direction across bridge
Center line be that line of symmetry is arranged symmetrically, and measure initial strain when strain gauge installs；
S2: the strain of each temporary consolidation column in measurement work progress；
S3: bridge torque is calculated according to the difference of different temporary consolidation columns strain and temporary consolidation intercolumniation.
Wherein, temporary consolidation column symmetry is arranged, and quantity is no less than 2 pairs.
The axial strain of synchro measure temporary consolidation column in S2.
Finally, bridge torque M are as follows:
Wherein, E is the elasticity modulus of temporary consolidation column, and A is the area of temporary consolidation column section, and n is temporary consolidation column
Quantity (to),Indicate that kth is poor to the axial strain on temporary consolidation column when jth operating condition, lkIndicate kth to temporary consolidation column
Spacing.
The advantageous effects of the above technical solutions of the present invention are as follows:
This method obtains being drawn by load using the strain gauge of direction across bridge antimere installation on temporary consolidation column or bridge pier
The axial strain of the column risen, it is possible thereby to torque caused by quantitative calculating bridge eccentric load, and test installation simply, easily
In operation.
Detailed description of the invention
Fig. 1 is that the monitoring method monitoring device of torque in bridge cantilever method symmetrical construction of the invention arranges schematic diagram；
Fig. 2 is temporary consolidation of embodiment of the present invention column sectional view, and unit is cm in figure；
Fig. 3 is the strain value of strain gauge on each temporary consolidation column under three kinds of operating conditions of the embodiment of the present invention.
Wherein: 1- bridge superstructure；The left front 2- temporary consolidation column；The left back 3- temporary consolidation column；4- faces right front
When consolidate column；The right back 5- temporary consolidation column；Strain gauge on the temporary consolidation column of the left front 6-；It is answered on the temporary consolidation column of the left back 7-
Become meter；Strain gauge on the temporary consolidation column of the right front 8-；Strain gauge on the temporary consolidation column of the right back 9-；10- digital signal acquiring instrument；
11- computer；Temporary consolidation column on the left of 201-；Temporary consolidation column on the right side of 202-；Strain gauge one on temporary consolidation column on the left of 203-；
Strain gauge two on temporary consolidation column on the left of 204-；Strain gauge three on temporary consolidation column on the left of 205-；Temporary consolidation column on the left of 206-
Upper strain gauge four；Strain gauge five on temporary consolidation column on the left of 207-；Strain gauge six on temporary consolidation column on the left of 208-；On the left of 209-
Strain gauge seven on temporary consolidation column；Strain gauge one on temporary consolidation column on the right side of 210-；Strain gauge on temporary consolidation column on the right side of 211-
Two；Strain gauge three on temporary consolidation column on the right side of 212-；Strain gauge four on temporary consolidation column on the right side of 213-；Temporary consolidation on the right side of 214-
Strain gauge five on column；Strain gauge six on temporary consolidation column on the right side of 215-；Strain gauge seven on temporary consolidation column on the right side of 216-.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention is directed to the deficiency of torque monitoring during existing cantilever construction, and it is symmetrical to provide a kind of bridge cantilever method
The monitoring method of torque in construction.
The method steps are as follows:
S1: the strain gauge of installation measurement temporary consolidation column axial strain on temporary consolidation column, and strain gauge is with direction across bridge
Center line be that line of symmetry is arranged symmetrically, and measure initial strain when strain gauge installs；
S2: the strain of each temporary consolidation column in measurement work progress；
S3: bridge torque is calculated according to the difference of different temporary consolidation columns strain and temporary consolidation intercolumniation.
As shown in Figure 1, in left front, temporary consolidation column 2, left back temporary consolidation column 3, right front are temporarily solid in this method
The symmetric position tied on the sustained height of column 4 and right back temporary consolidation column 5 installs strain gauge, respectively left front temporary consolidation
Strain gauge 6 on column, strain gauge 7 on the temporary consolidation column of left back, strain gauge 8 and right back are temporarily solid on the temporary consolidation column of right front
Strain gauge 9 on column is tied, the axial strain of temporary consolidation column is measured；It is applied with eccentric load on bridge superstructure 1, is produced pair
Claim torque M, is deformed temporary consolidation column, different temporary consolidation columns are measured by the strain gauge on different temporary consolidation columns respectively
Strain；Strain gauge 6 on the temporary consolidation column of left front, strain gauge 7 on the temporary consolidation column of left back, on the temporary consolidation column of right front
The data of strain gauge 9 are sent to computer by the connection of digital signal acquiring instrument 10 on strain gauge 8 and right back temporary consolidation column
11。
In the present invention, the derivation process according to load strain calculation bridge torque is as follows:
When strain gauge just installs, strain gauge 6 on the temporary consolidation column of left front is measured, on the temporary consolidation column of left back
The initial strain of strain gauge 9 is respectively on strain gauge 8 and right back temporary consolidation column on strain gauge 7, right front temporary consolidation columnWith
In the construction process, under jth operating condition, strain gauge 6 on the temporary consolidation column of left front, left back temporary consolidation column are measured
On upper strain gauge 7, right front temporary consolidation column on strain gauge 8 and right back temporary consolidation column strain gauge 9 initial strain difference
ForWith
If left front temporary consolidation column 2, left back temporary consolidation column 3, right front temporary consolidation column 4 and right back are temporarily solid
Knot column 5 axle power be respectivelyWithFrom the relationship of axle power and strain:
In formula: E is the elasticity modulus of temporary consolidation column, and A is the area of temporary consolidation column section；If front temporary consolidation column
The distance between rear temporary consolidation column is l.The torque of jth operating condition can be obtained by balance are as follows:
Formula (1) substitution formula (2) can be obtained:
Temporary consolidation column or bridge pier are usually all arranged symmetrically, in formula (2)WithA pair is arranged symmetrically
Power on temporary consolidation column,WithIt is the power on temporary consolidation column that another pair is arranged symmetrically.When there is multipair temporary consolidation
When column or bridge pier, it should be calculated according to above-mentioned calculation using the method for superposition.
Assuming that there are n to lateral symmetry temporary consolidation column for certain bridge, calculated according to the superposition of the algorithm of formula (3).It enablesIndicate that kth is poor to the axle power on temporary consolidation column when jth operating condition, usesIndicate that kth is to temporary consolidation column when jth operating condition
On axial strain it is poor, use lkKth is indicated to the spacing on temporary consolidation column, such as in above-mentioned derivation process l1=l2=
l.The case where then for n to temporary consolidation column, the calculation formula of torque are as follows:
When implementing, the strain of the spacing and each temporary consolidation column that need to measure every a pair of of temporary consolidation column can
Bridge torque is calculated.
Correctness to verify above-mentioned theory and the application in the construction of bridge cantilever method.Below in conjunction with attached drawing and implementation
Example, the present invention will be described in further detail.
Certain variable cross-section prestressed concrete continuous beam is constructed using cantilever-construction.Cantilever casting box girder 2# beam section is long
The long 3.0m of 2.5m, 3#~5# beam section, the long 3.5m of 6#~9# beam section, the long 4.5m of 10#~13# beam section, maximum cantilever construction length are
49m.The installation site of strain gauge and temperature sensor is as shown in Figure 2.According to the position in Fig. 2, left side temporary consolidation column 201
Strain gauge be successively denoted as from top to bottom left side temporary consolidation column strain gauge 1, left side temporary consolidation column strain gauge 2 204,
Left side temporary consolidation column strain gauge 3 205, left side temporary consolidation column strain gauge 4 206, left side temporary consolidation column strain gauge five
207, left side temporary consolidation column strain gauge 6 208, left side temporary consolidation column strain gauge 7 209, right side temporary consolidation column 202 is answered
Become meter be successively denoted as from top to bottom strain gauge 1 on the temporary consolidation column of right side, strain gauge 2 211 on the temporary consolidation column of right side,
Strain gauge 3 212 on the temporary consolidation column of right side, strain gauge 4 213 on the temporary consolidation column of right side strain on the temporary consolidation column of right side
Count strain gauge 6 215 on 5 214, right side temporary consolidation column, strain gauge 7 216 on the temporary consolidation column of right side, strain gauge 203 is to answering
The strain for becoming 216 jth operating conditions of meter is successively denoted as
Measured respectively during practice of construction 5# block pour complete certain moment, 8# block pour complete certain moment and
12# block pours the temporary consolidation column strain for completing certain moment, is denoted as operating condition 1, operating condition 2 and operating condition 3 respectively.In operating condition j (j=
1,2,3) the temporary consolidation column strain value in the case ofWith the temporary consolidation column strain value before Superstructure ConstructionDifference be
Strain caused by torsion load in the case of operating condition j,Value it is as shown in Figure 3.By can be in figure
Find out that the temporary consolidation column axial strain of symmetric position is different, there are lateral torsion effects for bridge superstructure.
The strain that strain gauge 206 and strain gauge 213 are surveyed is respectively the strain value of the temporary consolidation column of transverse center position,
Do not have to count in calculated torque.6 pairs of temporary consolidation column axial forces and 6 pairs of temporary consolidation column axial strains are then co-existed in, i.e.,
According to being calculated the case where n=6 in formula (4).Wherein lkSize can be calculated by the size in Fig. 2,Size by
Strain data in Fig. 3 is calculated, lk、Calculated result it is as shown in table 1.Temporary consolidation column diameter is 0.475m, temporarily
The equivalent elastic modulus for consolidating column is 6.11 × 1010Pa。
1 temporary consolidation axis of a cylinder of table is to strain differential
According to formula (4), the torque that can be calculated under three kinds of operating conditions is respectively as follows: -2.501 × 106Nm、-1.564×
106Nm and 0.299 × 106Nm。
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
1. the monitoring method of torque in a kind of bridge cantilever method symmetrical construction, characterized by the following steps:
S1: the strain gauge of installation measurement temporary consolidation column axial strain on temporary consolidation column, and strain gauge is in direction across bridge
Heart line is that line of symmetry is arranged symmetrically, and measures initial strain when strain gauge installs；
S2: the strain of each temporary consolidation column in measurement work progress；
S3: bridge torque is calculated according to the difference of different temporary consolidation columns strain and temporary consolidation intercolumniation；
The bridge torque M are as follows:
Wherein, E is the elasticity modulus of temporary consolidation column, and A is the area of temporary consolidation column section, and n is the quantity of temporary consolidation column
It is right,Indicate that kth is poor to the axial strain on temporary consolidation column when jth operating condition, lkIndicate kth to the spacing of temporary consolidation column.
2. the monitoring method of torque in bridge cantilever method symmetrical construction according to claim 1, it is characterised in that: described to face
When consolidation column symmetry setting, and quantity is no less than 2 pairs.
3. the monitoring method of torque in bridge cantilever method symmetrical construction according to claim 1, it is characterised in that: the step
The axial strain of synchro measure temporary consolidation column in rapid S2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710366151.2A CN107144385B (en) | 2017-05-22 | 2017-05-22 | The monitoring method of torque in a kind of bridge cantilever method symmetrical construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710366151.2A CN107144385B (en) | 2017-05-22 | 2017-05-22 | The monitoring method of torque in a kind of bridge cantilever method symmetrical construction |
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| CN107144385A CN107144385A (en) | 2017-09-08 |
| CN107144385B true CN107144385B (en) | 2019-07-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433845A (en) * | 2011-12-29 | 2012-05-02 | 广东冠粤路桥有限公司 | Novel temporary solidification system used for continuous beam cantilever construction |
| CN103410102A (en) * | 2013-08-29 | 2013-11-27 | 浙江省宏途交通建设有限公司 | H-shaped double column pier wide-bridge-surface cantilever temporary consolidation structure and construction method thereof |
-
2017
- 2017-05-22 CN CN201710366151.2A patent/CN107144385B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433845A (en) * | 2011-12-29 | 2012-05-02 | 广东冠粤路桥有限公司 | Novel temporary solidification system used for continuous beam cantilever construction |
| CN103410102A (en) * | 2013-08-29 | 2013-11-27 | 浙江省宏途交通建设有限公司 | H-shaped double column pier wide-bridge-surface cantilever temporary consolidation structure and construction method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 悬臂施工中临时固结柱的优化设计及实验;童歆 等;《桥梁建设》;20170217(第2期);第62-66页 |
| 悬臂浇注连续梁桥临时固结方案设计;姜有恒;《城市道桥与防洪》;20160630(第6期);第91-93页 |
| 悬臂浇筑连续箱梁的临时固结受力分析研究;程健 等;《技术与管理》;20131231;第12卷(第10期);第27-29页 |
| 预应力混凝土连续弯梁桥悬臂法施工的监控技术研究;杨亚芳;《铁道建筑》;20160229(第2期);第31-35,42页 |
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