CN102864747A - Method for constructing ultra-altitude-difference/overlength/extra-large-tonnage prestress steel beam - Google Patents
Method for constructing ultra-altitude-difference/overlength/extra-large-tonnage prestress steel beam Download PDFInfo
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- CN102864747A CN102864747A CN2012104181740A CN201210418174A CN102864747A CN 102864747 A CN102864747 A CN 102864747A CN 2012104181740 A CN2012104181740 A CN 2012104181740A CN 201210418174 A CN201210418174 A CN 201210418174A CN 102864747 A CN102864747 A CN 102864747A
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Abstract
The invention discloses a method for constructing an ultra-altitude-difference/overlength/extra-large-tonnage prestress steel beam, which comprises the following steps: step 1, pushing a single steel beam from the entrance end of a prestress pipeline to the outlet end of the prestress pipeline by a push-type cable threading machine; step 2, pushing and pulling the steel beam repeatedly back and forth when the steel beam reaches to the outlet end; step 3, pushing the steel beam out of the outlet end, then, marking the same numbers on two ends of the steel beam; step 4, processing the step 1 to the step 3 orderly and circularly, pushing and pulling a next steel beam, marking numbers orderly until all steel beams perforate the prestress pipeline completely; and step 5, assembling ground tackles and lifting jacks on two end heads of all steel beams so as to process prestress tension, finally, starting the lifting jacks so as to tension the steel beams. According to the invention, equipment and technology used in a whole construction procedure are simple; pipeline friction loss is reduced greatly; and the effect of steel beam tension is improved so as to achieve the invention purpose of specific stress.
Description
Technical field
The present invention relates to technical field of bridge construction, relate in particular to that a kind of superelevation is poor, the job practices of overlength, super-tonnage prestressed strand.
Background technology
In the fish ridge wall body process of constructing Large Span Prestressed footpath (such as 158m) concrete fish ridge continuous girder bridge, its fish ridge wall is as the main stress structure, because of the particularity of its form of structure, fish keel prestressed strand pipeline has superelevation poor (such as 20m), overlength (such as 156m), super-tonnage (such as 31-φ
s15.20) characteristics, how the various conventional bridge reduces pipe friction power, guarantees effective prestress, is one of its key technology.
Conventional continuous girder bridge is the deck type structure, and the prestressed strand layout feature is that the longer steel bundle discrepancy in elevation is less, the less (≤27-φ of the most tension tonnage of prestressed strand
s15.20), general short bundle is with artificial single wearing, in, long bundle is with special-purpose pushing-type cable machine lashing or comprehensive lashing.The comprehensive lashing of overlength Shu Caiyong.Indivedual built bridges adopt super-tonnage (such as 31-φ
s15.20) during the steel bundle, for overlength steel bundle, be to reduce pipe friction power, adopted comprehensive lashing method: namely at first send in the hole steel strand are single with strand pulling machine, penetrate altogether 22 steel strand, one in the steel strand that oneself is worn as the traction steel strand, the lashing cover is loaded onto in other 10 steel strand terminations, and is connected with the traction steel strand, starts hoist engine, reel the traction steel strand, will remain 10 steel wire bundles and be pulled to the other end from penetrating end.
But because concrete fish ridge continuous girder bridge is the lower support type structure, the prestressed strand layout feature is, the longer steel bundle discrepancy in elevation is larger, wherein be arranged in steel Shu Chaochang (such as 156m), the superelevation poor (such as 20m) of top, if employing the method, then one is that construction equipment is had relatively high expectations, the 2nd, and difficulty when last 10 steel bundles pass top, steel beam tube road simultaneously.
Therefore, those skilled in the art is devoted to develop a kind of easy construction, can effectively reduces pipe friction loss, is particularly useful for that superelevation is poor, the job practices of overlength, super-tonnage prestressed strand.
Summary of the invention
Because the defects of prior art, technical problem to be solved by this invention provides a kind of easy construction, can effectively reduce pipe friction loss, and the superelevation of fish ridge wall body that is applicable to stride greatly footpath concrete fish ridge continuous girder bridge is poor, the job practices of overlength, super-tonnage prestressed strand.
For achieving the above object, the invention provides that a kind of superelevation is poor, the job practices of overlength, super-tonnage prestressed strand, be applied in it the fish ridge wall of striding greatly footpath concrete fish ridge continuous girder bridge, be provided with in the described fish ridge wall body that some superelevation are poor, the prestress pipe of overlength, super-tonnage, described job practices may further comprise the steps:
Step 1, employing pushing-type cable machine are held single steel bundle and are pushed into the port of export from penetrating of described prestress pipe;
Step 2, when described steel bundle arrives the described port of export, described steel Shu Qianhou is carried out repeatedly push-and-pull repeatedly, so that described steel bundle can be freely in described prestress pipe smooth-going movement, and described steel bundle described prestress pipe penetrate end and port of export present position unanimous on the whole;
Step 3, described steel bundle is released the described port of export, then identical numbering on the two ends mark of described steel bundle;
Step 4, loop step 1 to step 3 successively, carry out the push-and-pull of next root steel bundle, its numbering on the mark successively is until all the steel bundle has been worn;
Step 5, carry out prestressed stretch-draw at two ends fit on ground tackle and the jack of whole described steel bundles, described steel bundle is according to the numbering of two ends successively corresponding being assembled in the perforation of described ground tackle, so that the steel bundle described prestress pipe penetrate the end and port of export present position unanimous on the whole, avoided mutually kinking between the described steel bundle, started at last the stretch-draw that jack carries out the steel bundle.
Better, described steel bundle is 31.
Better, described being numbered by digital 1-31 order number consecutively.
Superelevation of the present invention is poor, the job practices beneficial effect of overlength, super-tonnage prestressed strand is:
Job practices of the present invention is utilized the single propelling steel of pushing-type cable machine bundle, can smoothly the steel bundle be pushed into the port of export by penetrating end.Whenever pushed away simultaneously a steel bundle, the repeatedly push-and-pull that the capital is careful to this steel Shu Jinhang, its purpose be to guarantee the steel bundle can be freely in prestress pipe smooth-going movement smooth out with the fingers simultaneously along each root steel bundle, can loop this step and can significantly reduce pipe friction loss, for steel Shu Zhangla reach the stressed good basis of clearly establishing.Smooth out with the fingers same suitable steel bundle two ends mark and be convenient to recognize that it is the numbering of same steel bundle finishing, simultaneously because through numbering and smoothing out with the fingers suitable, can guarantee that the two ends of same steel bundle and the locus in the pipe end reach basically identical, help the carrying out of next step steel Shu Youxiao stretch-draw.The propelling of finishing whole steel bundles, repeatedly push-and-pull smooth out with the fingers suitable, the numbering after, two ends each fit on ground tackle and jack at the steel bundle, assembling process at ground tackle is smoothed out with the fingers suitable to steel Shu Jinhang again, so that same steel bundle further reaches consistent at the end that penetrates of prestress pipe with the locus of the port of export, avoided between the steel bundle existing kinking situation, started at last that jack has realized that superelevation is poor, overlength, convenient, the effective stretch-draw of super-tonnage prestressed strand.
In sum, whole work progress device therefor of the present invention and technique are simple, adopt job practices energy decrease pipe friction loss of the present invention, improve the effect of steel Shu Zhangla, reached stressed clear and definite goal of the invention, especially be fit to be applied in the fish ridge wall body of striding greatly footpath concrete fish ridge continuous girder bridge.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand fully purpose of the present invention, feature and effect.
Description of drawings
Fig. 1 is that a kind of superelevation of one embodiment of the invention is poor, the job practices schematic flow sheet of overlength, super-tonnage prestressed strand.
Fig. 2 is the structural representation of striding greatly the fish ridge wall body of footpath concrete fish ridge continuous girder bridge.
The specific embodiment
As shown in Figure 1, a kind of superelevation of a specific embodiment of the present invention is poor, the job practices of overlength, super-tonnage prestressed strand, be applied in it the fish ridge wall of striding greatly footpath concrete fish ridge continuous girder bridge, be provided with in the described fish ridge wall body that some superelevation are poor, the prestress pipe of overlength, super-tonnage, wherein, described job practices may further comprise the steps:
Step S1, employing pushing-type cable machine are held single steel bundle and are pushed into the port of export from penetrating of described prestress pipe;
Step S2, when described steel bundle arrives the described port of export, described steel Shu Qianhou is carried out repeatedly push-and-pull repeatedly, so that described steel bundle can be freely in described prestress pipe smooth-going movement, and described steel bundle described prestress pipe penetrate end and port of export present position unanimous on the whole;
Step S3, described steel bundle is released the described port of export, then identical numbering on the two ends mark of described steel bundle;
Step S4, loop step 1 to step 3 successively, carry out the push-and-pull of next root steel bundle, its numbering on the mark successively is until all the steel bundle has been worn;
Step S5, carry out prestressed stretch-draw at two ends fit on ground tackle and the jack of whole described steel bundles, described steel bundle is according to the numbering of two ends successively corresponding being assembled in the perforation of described ground tackle, so that the steel bundle described prestress pipe penetrate the end and port of export present position unanimous on the whole, avoided mutually kinking between the described steel bundle, started at last the stretch-draw that jack carries out the steel bundle.
Exemplary, this implements described steel bundle is 31, described being numbered by digital 1-31 order number consecutively, i.e. digital 1-31 on the two ends correspondence markings of 31 steel bundles, concrete, can prefabricated paper with number designation pullover, when step S3, correspondence is set in steel bundle two ends.
Exemplary, the fish ridge wall of striding greatly footpath concrete fish ridge continuous girder bridge that the present embodiment is applied in as shown in Figure 2 is so with it:
According to the above-mentioned construction sequence of the present embodiment, finish successively the lashing of steel bundle and the stretch-draw of each prestress pipe in the fish ridge wall body of striding greatly footpath concrete fish ridge continuous girder bridge, last and fish ridge wall body carries out the moulding of concrete formed by integrally casting.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all in the art technician all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (3)
1. the job practices of poor, the overlength of a superelevation, super-tonnage prestressed strand, be applied in it the fish ridge wall of striding greatly footpath concrete fish ridge continuous girder bridge, be provided with in the described fish ridge wall body that some superelevation are poor, the prestress pipe of overlength, super-tonnage, it is characterized in that, described job practices may further comprise the steps:
Step 1, employing pushing-type cable machine are held single steel bundle and are pushed into the port of export from penetrating of described prestress pipe;
Step 2, when described steel bundle arrives the described port of export, described steel Shu Qianhou is carried out repeatedly push-and-pull repeatedly, so that described steel bundle can be freely in described prestress pipe smooth-going movement, and described steel bundle described prestress pipe penetrate end and port of export present position unanimous on the whole;
Step 3, described steel bundle is released the described port of export, then identical numbering on the two ends mark of described steel bundle;
Step 4, loop step 1 to step 3 successively, carry out the push-and-pull of next root steel bundle, its numbering on the mark successively is until all the steel bundle has been worn;
Step 5, carry out prestressed stretch-draw at two ends fit on ground tackle and the jack of whole described steel bundles, described steel bundle is according to the numbering of two ends successively corresponding being assembled in the perforation of described ground tackle, so that the steel bundle described prestress pipe penetrate the end and port of export present position unanimous on the whole, avoided mutually kinking between the described steel bundle, started at last the stretch-draw that jack carries out the steel bundle.
2. the job practices of poor, the overlength of superelevation as claimed in claim 1, super-tonnage prestressed strand, it is characterized in that: described steel bundle is 31.
3. the job practices of poor, the overlength of superelevation as claimed in claim 2, super-tonnage prestressed strand is characterized in that: described being numbered by digital 1-31 order number consecutively.
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| CN201210418174.0A CN102864747B (en) | 2012-10-26 | 2012-10-26 | Method for constructing ultra-altitude-difference/overlength/extra-large-tonnage prestress steel beam |
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| CN102864747B CN102864747B (en) | 2015-03-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3869530A (en) * | 1974-02-19 | 1975-03-04 | Chester I Williams | Method of constructing a prestressed concrete circular wall |
| DE2717869A1 (en) * | 1977-04-22 | 1978-10-26 | Dyckerhoff & Widmann Ag | PROCESS FOR THE MANUFACTURING OF COMPONENTS FROM PRE-TENSIONED CONCRETE |
| DE2819176A1 (en) * | 1978-05-02 | 1979-11-08 | Focke Karl August | Reinforcement of glass fibre for concrete castings - is fibre strand embedded in synthetic resin-filled, flexible hose |
| CN101798875A (en) * | 2010-03-16 | 2010-08-11 | 南通华荣建设集团有限公司 | Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side |
| CN102003073A (en) * | 2010-12-11 | 2011-04-06 | 中冶建工有限公司 | Constructing method for threading pre-stress structure steel strands |
| CN102691268A (en) * | 2012-06-12 | 2012-09-26 | 宁波二十冶建设有限公司 | Stretching construction process of super-long prestressed tendon |
-
2012
- 2012-10-26 CN CN201210418174.0A patent/CN102864747B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3869530A (en) * | 1974-02-19 | 1975-03-04 | Chester I Williams | Method of constructing a prestressed concrete circular wall |
| DE2717869A1 (en) * | 1977-04-22 | 1978-10-26 | Dyckerhoff & Widmann Ag | PROCESS FOR THE MANUFACTURING OF COMPONENTS FROM PRE-TENSIONED CONCRETE |
| DE2819176A1 (en) * | 1978-05-02 | 1979-11-08 | Focke Karl August | Reinforcement of glass fibre for concrete castings - is fibre strand embedded in synthetic resin-filled, flexible hose |
| CN101798875A (en) * | 2010-03-16 | 2010-08-11 | 南通华荣建设集团有限公司 | Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side |
| CN102003073A (en) * | 2010-12-11 | 2011-04-06 | 中冶建工有限公司 | Constructing method for threading pre-stress structure steel strands |
| CN102691268A (en) * | 2012-06-12 | 2012-09-26 | 宁波二十冶建设有限公司 | Stretching construction process of super-long prestressed tendon |
Non-Patent Citations (4)
| Title |
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| 杨基好等: "新型钢绞线穿束机快速穿束综合施工技术", 《铁道标准设计》 * |
| 王军等: "黑龙江速滑馆预应力施工", 《低温建筑技术》 * |
| 陈浪: "后张法预应力施工技术", 《黑龙江科技信息》 * |
| 黄乔森: "一种用于大跨度桥梁钢绞线穿束的装置施工技术", 《广东公路交通》 * |
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Address after: 200011 Tibet South Road, Shanghai, No. 1170, No. Patentee after: Shanghai urban construction design & Research Institute (Group) Co., Ltd. Address before: 200125 Dongfang Road, Shanghai, Pudong New Area, No. 3447 Patentee before: Shanghai Urban Construction Design & Research Institute |