CN103233425B - Method for observing support cast-in-place beam preloading by utilizing reflector - Google Patents
Method for observing support cast-in-place beam preloading by utilizing reflector Download PDFInfo
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- CN103233425B CN103233425B CN201310139499.XA CN201310139499A CN103233425B CN 103233425 B CN103233425 B CN 103233425B CN 201310139499 A CN201310139499 A CN 201310139499A CN 103233425 B CN103233425 B CN 103233425B
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Abstract
The invention relates to a method for observing support cast-in-place beam preloading by utilizing a reflector. The method mainly comprises the steps of fixing the reflector at the position to be observed, inputting an elevation in a measuring instrument, observing and recording coordinates and elevations of the reflector before and after preloading, and calculating the displacement of a support structure according to changes of coordinates and elevations of the reflector before and after preloading. The method has the advantages that settlement observation of support preloading in the large-span high cast-in-place beam construction is achieved; settlement is observed accurately on the premise that constructors are not required to enter preloading fields; the safety of constructors is guaranteed; the measurement is convenient, stationing is easy, places where prisms cannot arrive easily can be observed freely, and the high-altitude operation risks of measuring staff are reduced.
Description
Technical field
The present invention relates to bridge erection technical field, particularly relate to a kind of support cast-in-place beam precompressed observation procedure utilizing reflecting piece.
Background technology
The construction of recent year many Line for Passenger Transportation circuits is open-minded, and for the development of national economy brings enormous motivation, the progress of the strong growth facilitating national economy and society, facilitates expanding economy along the line greatly.Non-fragment orbit technology is carried out in the whole nation comprehensively.In large span, highly high in-situ beam casting, for ensureing construction safety, precompressed detection is carried out to strutting system, surcharge preloading is carried out to support, the object one of precompressed eliminates the nonelastic deformation of support and ground, two be measure support elastic deformation value as arrange construction arch rise left in advance foundation, three be inspection foundation capability.The work must done at the surveying work of routine is exactly directed, needs to run chi person and removes frame prism to backsight point or set up mark; Perhaps it is difficult for often encountering a lot of local erection prism in work, in railroad bridge erection in recent years, can be found everywhere up to the bridge of tens meters, this bridge or be difficult to arrive, or need to require considerable time and effort could the good prism of frame.Carry out the monitoring of beam body deformability, need regularly to go to set up prism to deformation point, and this process often will continue for some time.
Summary of the invention
The object of this invention is to provide a kind of support cast-in-place beam precompressed observation procedure utilizing reflecting piece, to overcome currently available technology above shortcomings.
The object of the invention is to be achieved through the following technical solutions:
Utilize a support cast-in-place beam precompressed observation procedure for reflecting piece, said method comprising the steps of:
Step one: at observation place erection measuring apparatus;
Step 2: need the position of monitoring to fix reflecting piece on Bailey beam, steel pipe column, crossbeam and longeron, the front of reflecting piece is positioned at the side of erection measuring apparatus, will ensure placement location and the measuring apparatus intervisibility of reflecting piece simultaneously;
Step 3: pre-pressing bracket load is monitored each reflecting piece by measuring apparatus and records each monitoring point initial value before applying;
Step 4: after pre-pressing bracket load applies 1 hour, carries out the monitoring of displacement to each reflecting piece and records numerical value, until the difference of the average of twice displacement monitoring is not more than 2mm, loads later next time once every monitoring in 6 hours;
Step 5: after all prefabricating load has applied, monitored at interval of 6 hours and record the displacement of each reflecting piece, when the difference of continuous 12 hours displacement monitoring average is not more than 2mm, removal prefabricating load, unload after 6 hours, monitor and record the displacement of each reflecting piece;
Step 6: after pre-pressing bracket load completes, calculates foundation's settlement, rack elasticity deflection, nonelastic deformation amount and in-plane displancement amount according to monitored data, evaluates stent safety and determines mould absolute altitude, completes pre-pressing bracket report.
Further, in step 4 and five, to measuring apparatus input absolute altitude, observe and record the coordinate of reflecting piece before and after precompressed and absolute altitude, and according to the displacement of reflecting piece at the change calculations supporting structure of the forward and backward coordinate of precompressed and absolute altitude.
Preferably, described measuring apparatus is total powerstation, and the described reflecting piece back side is provided with adhesive sticker.
Beneficial effect of the present invention is: 1), solve the relevant issues of settlement observation of large span, highly high in-situ beam casting medium-height trestle precompressed; 2) ensure not enter precompressed place constructor, accurate surveying sedimentation; 3), constructor's safety is ensured; 4), measure conveniently, layout easily, prism arbitrarily can be observed to be not easy the place arrived, reduce the risk operation of survey crew high-altitude.
Accompanying drawing explanation
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is one of using state reference diagram of the support cast-in-place beam precompressed observation procedure utilizing reflecting piece described in the embodiment of the present invention;
Fig. 2 is the using state reference diagram two of the support cast-in-place beam precompressed observation procedure utilizing reflecting piece described in the embodiment of the present invention.
In figure:
1, total powerstation; 2, reflecting piece.
Detailed description of the invention
As shown in Figure 1-2, a kind of support cast-in-place beam precompressed observation procedure utilizing reflecting piece described in the embodiment of the present invention, said method comprising the steps of:
Step one: at observation place erection measuring apparatus;
Step 2: need the position of monitoring to fix reflecting piece 2 on Bailey beam, steel pipe column, crossbeam and longeron, the front of reflecting piece 2 is positioned at the side of erection measuring apparatus, will ensure placement location and the measuring apparatus intervisibility of reflecting piece 2 simultaneously;
Step 3: pre-pressing bracket load is monitored each reflecting piece 2 by measuring apparatus and records each monitoring point initial value before applying;
Step 4: after pre-pressing bracket load applies 1 hour, carries out the monitoring of displacement to each reflecting piece 2 and records numerical value, until the difference of the average of twice displacement monitoring is not more than 2mm, loads later next time once every monitoring in 6 hours;
Step 5: after all prefabricating load has applied, monitored at interval of 6 hours and record the displacement of each reflecting piece 2, when the difference of continuous 12 hours displacement monitoring average is not more than 2mm, removal prefabricating load, unload after 6 hours, monitor and record the displacement of each reflecting piece 2;
Step 6: after pre-pressing bracket load completes, calculates foundation's settlement, rack elasticity deflection, nonelastic deformation amount and in-plane displancement amount according to monitored data, evaluates stent safety and determines mould absolute altitude, completes pre-pressing bracket report.
In above-mentioned steps four and five, to measuring apparatus input absolute altitude, observe and record the coordinate of reflecting piece 2 before and after precompressed and absolute altitude, and according to the displacement of reflecting piece 2 at the change calculations supporting structure of the forward and backward coordinate of precompressed and absolute altitude.
Described measuring apparatus is total powerstation 1, and described reflecting piece 2 back side is provided with adhesive sticker.
Small and exquisite, settle self-adhesive type reflector plate easily to have the plurality of specifications such as 20mm × 20mm, 40mm × 40mm, 60mm × 60mm, self-adhesive type reflecting piece 2 below with adhesive sticker, directly paste need observation object on.Durable self-adhesive type reflecting piece 2 can use under most of working environment, can be laid in for a long time need observation object above.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but any change is done in its shape or structure; every have identical with the application or akin technical scheme, all drops within protection scope of the present invention.
Claims (3)
1. utilize a support cast-in-place beam precompressed observation procedure for reflecting piece, it is characterized in that, said method comprising the steps of:
Step one: at observation place erection measuring apparatus;
Step 2: need the position of monitoring to fix reflecting piece (2) on Bailey beam, steel pipe column, crossbeam and longeron, the front of reflecting piece (2) is positioned at the side of erection measuring apparatus, will ensure placement location and the measuring apparatus intervisibility of reflecting piece (2) simultaneously;
Step 3: pre-pressing bracket load is monitored each reflecting piece (2) by measuring apparatus and records each monitoring point initial value before applying;
Step 4: after pre-pressing bracket load applies 1 hour, carries out the monitoring of displacement to each reflecting piece (2) and records numerical value, until the difference of the average of twice displacement monitoring is not more than 2mm, loads later next time once every monitoring in 6 hours;
Step 5: after all prefabricating load has applied, monitored at interval of 6 hours and record the displacement of each reflecting piece (2), when the difference of continuous 12 hours displacement monitoring average is not more than 2mm, removal prefabricating load, unload after 6 hours, monitor and record the displacement of each reflecting piece (2); And
Step 6: after pre-pressing bracket load completes, the data according to record calculate foundation's settlement, rack elasticity deflection, nonelastic deformation amount and in-plane displancement amount, evaluate stent safety and determine mould absolute altitude, complete pre-pressing bracket report.
2. the support cast-in-place beam precompressed observation procedure utilizing reflecting piece according to claim 1, it is characterized in that: in step 4 and step 5, to measuring apparatus input absolute altitude, observe and record the coordinate of reflecting piece (2) before and after precompressed and absolute altitude, and according to the displacement of reflecting piece (2) at the change calculations supporting structure of the forward and backward coordinate of precompressed and absolute altitude.
3. the support cast-in-place beam precompressed observation procedure utilizing reflecting piece according to claim 1 and 2, is characterized in that: described measuring apparatus is total powerstation (1), and described reflecting piece (2) back side is provided with adhesive sticker.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310139499.XA CN103233425B (en) | 2013-04-20 | 2013-04-20 | Method for observing support cast-in-place beam preloading by utilizing reflector |
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| CN201310139499.XA CN103233425B (en) | 2013-04-20 | 2013-04-20 | Method for observing support cast-in-place beam preloading by utilizing reflector |
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| CN103233425B true CN103233425B (en) | 2015-07-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110160489A (en) * | 2018-02-10 | 2019-08-23 | 中铁十局集团第三建设有限公司 | A kind of Cast-in-situ Beam pre-pressing bracket Fibre Optical Sensor settlement automatic monitoring method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109137761A (en) * | 2018-09-29 | 2019-01-04 | 中铁二局集团有限公司 | A method of it controlling existing bridge and to widen bridge settlement poor |
| CN109826108B (en) * | 2019-01-15 | 2020-08-11 | 东南大学 | Automatic bridge incremental launching monitoring method based on lofting robot |
| CN110595427A (en) * | 2019-10-31 | 2019-12-20 | 杈惧己 | Bridge construction mounting system settlement displacement monitoring devices |
| CN114166174A (en) * | 2021-11-10 | 2022-03-11 | 中铁二十局集团第一工程有限公司 | Deformation monitoring system and method for steel truss girder slideway support |
| CN114441307A (en) * | 2021-12-29 | 2022-05-06 | 中铁二十局集团有限公司 | Support pre-pressing method |
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| CN103233425A (en) | 2013-08-07 |
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