CN103727934B - A kind of accurate construction lofting method of cantilever glider bridge construction - Google Patents
A kind of accurate construction lofting method of cantilever glider bridge construction Download PDFInfo
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- CN103727934B CN103727934B CN201410025067.0A CN201410025067A CN103727934B CN 103727934 B CN103727934 B CN 103727934B CN 201410025067 A CN201410025067 A CN 201410025067A CN 103727934 B CN103727934 B CN 103727934B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
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Abstract
The invention discloses a kind of cantilever glider bridge to construct accurate construction lofting method, by forced centering observation stand, in the observation steady period, setting-out goes out cantilever glider bridge and to construct two reference mark of accurate construction lofting; Then accurately layout point is determined by observing mutually at two reference mark erection total powerstations.Use the method to carry out the construction lofting of cantilever glider bridge construction, the stability of cantilever glider bridge construction lofting can be ensured, also can improve the accuracy of cantilever glider bridge construction lofting.
Description
Technical field
The present invention relates to the accurate construction lofting method of a kind of cantilever glider bridge construction.
Background technology
For tall and big cantilever glider bridge, the accuracy of construction lofting is the key factor determining construction quality and success or failure.The accuracy of construction lofting relates generally to plane positioning and elevation location.And the accuracy of plane positioning is the most important thing in construction lofting quality control.The large area of building of current mountainous area highway is launched, and tall and big bridge, particularly high pier bridge are more and more.Widely, and the height of pier is higher for cantilever glider bridge or the use of T steel structure beam bridge in mountain area, require basis, pier shaft, cantilever segment construction lofting quality higher.Frequent appearance causes fried pier due to the too large even appearance mistake of construction lofting error, ruins the generation of pier event, causes certain loss to national economy.And the total powerstation polar method construction lofting method that traditional construction lofting technology, particularly domestic unit in charge of construction generally adopt, there is very large risk.Such as in mountain area, the distance of lofting control point and basis, high pier and cantilever segment layout point, due to the restriction of landform, often reaches 200-300 meters far away even farther.The setting-out distance of length like this, any tiny error in measuring process is all likely amplified to the limit difference scope exceeding specification and specify.So, need the method proposing the accurate construction lofting of a kind of cantilever glider bridge.
Summary of the invention
Easily there is error to solve current cantilever glider bridge construction lofting and cause the affected technical matters of engineering, the invention provides the accurate construction lofting method of a kind of cantilever glider bridge construction.
Technical scheme of the present invention is, a kind of accurate construction lofting method of cantilever glider bridge construction, comprises the steps:
Step 1: the forced centering observation stand near cantilever glider bridge construction place sets up total powerstation observe by being arranged on, setting-out goes out cantilever glider bridge and to construct two reference mark of accurate construction lofting, and two reference mark are the firmly quality section of the end of the bridge of extended line on cantilever glider bridge two reverse directions of cantilever glider bridge bridge axis and the position that can observe mutually;
Step 2: set pre-layout point as cantilever beam section is along the mid point a of bridge axis direction length, now make one of them reference mark be A, another reference mark is B, then A in theory, a, B three point on a straight line, at A place, reference mark erection total powerstation, the aiming subtend reference mark B that faces left determines Article 1 direction of visual lines, then on Article 1 direction of visual lines, with reference mark A for starting point, with the distance between reference mark A and pre-layout point a for length, determine position 1;
Step 3: the total powerstation set up on the A of reference mark again, coils right aiming subtend reference mark B, determines Article 2 direction of visual lines, then on Article 2 direction of visual lines, with reference mark A for starting point, with the distance between reference mark A and pre-layout point a for length, determines position 2;
Step 4: the fetch bit mid point of putting line between 1 and position 2 just to be fixed a point a1 as setting-out;
Step 5: set up total powerstation again on the B of reference mark, the aiming subtend reference mark A that faces left determines Article 3 direction of visual lines, then on Article 3 direction of visual lines, with reference mark B for starting point, with the distance between reference mark B and pre-layout point a for length, determines position 3;
Step 6: set up total powerstation again on the B of reference mark, coils right aiming subtend reference mark A and determines Article 4 direction of visual lines, then on Article 4 direction of visual lines, with reference mark B for starting point, with the distance between reference mark B and pre-layout point a for length, determines position 4;
Step 7: fetch bit puts the mid point of line between 3 and position 4 as setting-out time fixed point a2;
Step 8: pick and place just fix a point a1 and setting-out time of sample and fix a point the mid point of line between a2 as the accurate layout point of a point.
Technique effect of the present invention is, can ensure the accuracy of construction lofting, also can expand the suitable time of construction lofting, solves the accuracy problem of cantilever glider bridge construction lofting, greatly reduces error probability and the risk of construction lofting.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Embodiment
See Fig. 1, the present invention includes following steps:
Step 1: the forced centering observation stand near cantilever glider bridge construction place sets up total powerstation observe by being arranged on, setting-out goes out cantilever glider bridge and to construct two reference mark of accurate construction lofting, and two reference mark are the firmly quality section of the end of the bridge of extended line on cantilever glider bridge two reverse directions of cantilever glider bridge bridge axis and the position that can observe mutually;
Step 2: set pre-layout point as cantilever beam section is along the mid point a of bridge axis direction length, now make one of them reference mark be A, another reference mark is B, then A in theory, a, B three point on a straight line, at A place, reference mark erection total powerstation, the aiming subtend reference mark B that faces left determines Article 1 direction of visual lines, then on Article 1 direction of visual lines, with reference mark A for starting point, with the distance between reference mark A and pre-layout point a for length, determine position 1;
Step 3: the total powerstation set up on the A of reference mark again, coils right aiming subtend reference mark B, determines Article 2 direction of visual lines, then on Article 2 direction of visual lines, with reference mark A for starting point, with the distance between reference mark A and pre-layout point a for length, determines position 2;
Step 4: the fetch bit mid point of putting line between 1 and position 2 just to be fixed a point a1 as setting-out;
Step 5: set up total powerstation again on the B of reference mark, the aiming subtend reference mark A that faces left determines Article 3 direction of visual lines, then on Article 3 direction of visual lines, with reference mark B for starting point, with the distance between reference mark B and pre-layout point a for length, determines position 3;
Step 6: set up total powerstation again on the B of reference mark, coils right aiming subtend reference mark A and determines Article 4 direction of visual lines, then on Article 4 direction of visual lines, with reference mark B for starting point, with the distance between reference mark B and pre-layout point a for length, determines position 4;
Step 7: fetch bit puts the mid point of line between 3 and position 4 as setting-out time fixed point a2;
Step 8: pick and place just fix a point a1 and setting-out time of sample and fix a point the mid point of line between a2 as the accurate layout point of a point.
Claims (1)
1. an accurate construction lofting method for cantilever glider bridge construction, is characterized in that, comprise the steps:
Step 1: the forced centering observation stand near cantilever glider bridge construction place sets up total powerstation observe by being arranged on, setting-out goes out cantilever glider bridge and to construct two reference mark of accurate construction lofting, and two reference mark are the firmly quality section of the end of the bridge of extended line on cantilever glider bridge two reverse directions of cantilever glider bridge bridge axis and the position that can observe mutually;
Step 2: set pre-layout point as cantilever beam section is along the mid point a of bridge axis direction length, now make one of them reference mark be A, another reference mark is B, then A in theory, a, B three point on a straight line, at A place, reference mark erection total powerstation, the aiming subtend reference mark B that faces left determines Article 1 direction of visual lines, then on Article 1 direction of visual lines, with reference mark A for starting point, with the distance between reference mark A and pre-layout point a for length, determine position 1;
Step 3: the total powerstation set up on the A of reference mark again, coils right aiming subtend reference mark B, determines Article 2 direction of visual lines, then on Article 2 direction of visual lines, with reference mark A for starting point, with the distance between reference mark A and pre-layout point a for length, determines position 2;
Step 4: the fetch bit mid point of putting line between 1 and position 2 just to be fixed a point a1 as setting-out;
Step 5: set up total powerstation again on the B of reference mark, the aiming subtend reference mark A that faces left determines Article 3 direction of visual lines, then on Article 3 direction of visual lines, with reference mark B for starting point, with the distance between reference mark B and pre-layout point a for length, determines position 3;
Step 6: set up total powerstation again on the B of reference mark, coils right aiming subtend reference mark A and determines Article 4 direction of visual lines, then on Article 4 direction of visual lines, with reference mark B for starting point, with the distance between reference mark B and pre-layout point a for length, determines position 4;
Step 7: fetch bit puts the mid point of line between 3 and position 4 as setting-out time fixed point a2;
Step 8: pick and place just fix a point a1 and setting-out time of sample and fix a point the mid point of line between a2 as the accurate layout point of a point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410025067.0A CN103727934B (en) | 2014-01-20 | 2014-01-20 | A kind of accurate construction lofting method of cantilever glider bridge construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410025067.0A CN103727934B (en) | 2014-01-20 | 2014-01-20 | A kind of accurate construction lofting method of cantilever glider bridge construction |
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| Publication Number | Publication Date |
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| CN103727934A CN103727934A (en) | 2014-04-16 |
| CN103727934B true CN103727934B (en) | 2016-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410025067.0A Expired - Fee Related CN103727934B (en) | 2014-01-20 | 2014-01-20 | A kind of accurate construction lofting method of cantilever glider bridge construction |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110057245B (en) * | 2019-03-11 | 2021-06-04 | 中国人民解放军63883部队 | High-precision lofting method for shooting datum |
| CN110030019B (en) * | 2019-05-28 | 2021-12-31 | 中国五冶集团有限公司 | Rapid positioning lofting method for tunnel primary support steel arch frame |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158146A (en) * | 2007-11-20 | 2008-04-09 | 中铁大桥局集团第二工程有限公司 | Cable-stayed bridge main-beam sliding form frame system and construction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10275299A (en) * | 1997-03-31 | 1998-10-13 | Saginomiya Seisakusho Inc | Vehicle position recognition device for parking lot and parking lot management system |
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2014
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158146A (en) * | 2007-11-20 | 2008-04-09 | 中铁大桥局集团第二工程有限公司 | Cable-stayed bridge main-beam sliding form frame system and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 测量中以2点找第三点的一些方法应用;赖海军;《科技传播》;20131010(第18期);第138页、149页 * |
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