CN1644796A - Production of concrete beam - Google Patents
Production of concrete beam Download PDFInfo
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- CN1644796A CN1644796A CN 200510023316 CN200510023316A CN1644796A CN 1644796 A CN1644796 A CN 1644796A CN 200510023316 CN200510023316 CN 200510023316 CN 200510023316 A CN200510023316 A CN 200510023316A CN 1644796 A CN1644796 A CN 1644796A
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Abstract
A technology for preparing concrete beam includes such steps as providing shuttering boards, binding reinforcing bars, arranging prestressing corrugated pipe and twisted steel wires, pouring concrete, stretching, grouting, sealing anchor, ageing, stretching for external prestressing, grouting, sealing anchor, precise locating, and installing track or other functional parts.
Description
Technical field:
The present invention relates to concrete beam, especially for the prestressing force method to set up of the prestressed girder body of the running rail of the rail beam of the bridge construction of high-speed railway, High-speed Wheel and magnetic suspended railway and railroad vehicle, specifically a kind of prestressing force method to set up with prestressed concrete beam of high-precision deformation requirement.
Background technology:
High speed rail system has very high requirement to track linear, with guarantee train when the high-speed cruising safety and passenger's comfortableness.Therefore, after the factors such as consideration construction error, the expendable distortion (as concrete shrinkage and the distortion of creeping and causing) that requires the non-loads change of bridge construction to cause reduces as far as possible and be controlled is very important.
Because high-speed railway has higher requirement to the rigidity of bridge construction.Different with traditional highway and railroad bridge, no longer be the strength control design, but Deformation Control Design.Prestressed reinforced concrete construction has that rigidity is big, total cross-section participation work and can also be suitable for the bridge construction to the high speed railway track traffic system of rail beam deformation requirements by advantages such as prestressing force adjustment distortion.
For traditional prestressing force design, Stress Control often, least favorable combination the carrying out prestressing force that causes internal force by various loads designs, and only as the check of normal operating condition, its arch also allows for several centimetres the TERM DEFORMATION that creep of concrete and contraction cause.But for the bridge construction of high-speed railway, require after the track installation, the TERM DEFORMATION that creep of concrete and contraction cause is controlled in several millimeters scopes.Therefore, the control and the associated construction technology of how to carry out TERM DEFORMATION is vital.
In patent CN 1344836A, provided a kind of design and manufacture method thereof that is used for magnetic levitation track girder, the prestressing force setting comprises once opens earlier and twice posttension.Adopt this method to need large-scale pre-tensioned prestressing workshop and more than the large-tonnage pre-tensioned prestressing stretching bed seat (1500t).For long distance line, need certain distance along the line that a pre-tensioned prestressing workshop is set, increase engineering cost greatly, have certain limitation.
Summary of the invention:
The object of the present invention is to provide a kind of preparation method of concrete beam, it can overcome some shortcomings of the prior art.
To achieve these goals, technical scheme of the present invention is: a kind of preparation method of concrete beam is characterized in that: described concrete beam prestressing force method to set up may further comprise the steps: a, formwork erection, assembling reinforcement; B, lay prestressing force bellows and prestress wire; C, concreting; D, treat that concrete reaches certain intensity after, the stretch-draw post-tensioned prestressing; E, be in the milk, sealing off and covering anchorage; F, treat that duct mortar and sealing off and covering anchorage concrete reach the intensity of designing requirement, winch to beam strorage area and deposit; G, stretch-draw external prestressing; H, be in the milk again, sealing off and covering anchorage; I, treat that the intensity that duct mortar and sealing off and covering anchorage concrete reach designing requirement accurately locatees; J, attachment rail or other functor.
The characteristics of technical scheme of the present invention are: according to the control requirement of high-speed rail transportation to the rail beam TERM DEFORMATION, to allow deformation values as the control target, determine appropriate pre _ stress bundle collocation method by computational analysis, bridge construction is controlled in the permissible range by the concrete shrinkage and the TERM DEFORMATION that produces of creeping after installation.The present invention is owing to have bonding post-tensioned prestressing and external prestressing to bear dead load and train load jointly, and external prestressing also has the function of adjusting the deflection deformation of rail beam later stage.Prestressing tendon shape can not adopted corresponding with bending moment diagram parabola shaped, even part straight line post-tensioned prestressing bundle can be set, and can reduce prestressed consumption like this, and the tension prestress workshop need not be set, and has reduced the bridge construction cost.For post-tensioning prestress with bond and external prestressing mixed configuration mode, external prestressing configuration quantity generally is advisable with balance mobile load moment of flexure, and this kind mode both can reduce creep deformation, but the later stage is adjusted distortion by adjusting stress state again.
Description of drawings:
Fig. 1 is the structural representation of one embodiment of the invention
Fig. 2 is the A-A view of Fig. 1
Fig. 3 is the B-B view of Fig. 1
Fig. 4 is a making schematic diagram of the present invention
The specific embodiment:
The invention will be further described below in conjunction with drawings and Examples.
The present invention is a kind of preparation method of concrete beam, it is characterized in that: described concrete beam prestressing force method to set up may further comprise the steps: a, formwork erection, assembling reinforcement; B, lay prestressing force bellows and prestress wire; C, concreting; D, treat that concrete reaches certain intensity after, the stretch-draw post-tensioned prestressing; E, be in the milk, sealing off and covering anchorage; F, treat that duct mortar and sealing off and covering anchorage concrete reach the intensity of designing requirement, winch to beam strorage area and deposit; G, stretch-draw external prestressing; H, be in the milk again, sealing off and covering anchorage; I, treat that the intensity that duct mortar and sealing off and covering anchorage concrete reach designing requirement accurately locatees; J, attachment rail or other functor.Said concrete designing requirement intensity is meant building standard in this preparation method, i.e. " Standard for quality control of concrete " GB50164-92, the present invention is a kind of preparation method that satisfies the linear requirement of high accuracy of Rail Transit System and be convenient to the concrete beam of site operation.After beam body concreting reaches the intensity of designing requirement, stretch-draw post-tensioned prestressing single tension is finished, and corresponding pre-arch is set, prestress wire is a parabola, the post-stressed tensioning process that adopts, structure both can be in factory or site prefabrication, again can be cast-in-place at the scene, and stretch-draw is external at once can be respectively to be provided with straight line posttension bundle at the upper limb and the lower edge of beam body in advance.
The prestressing force of beam body adopts bonding and external mixing post-tensioned prestressing technology in the body, as shown in Figure 1, wherein label 1 is represented the form of post-tensioned prestressing bunch for the first time, and label 2 expressions are the form of post-tensioned prestressing bunch for the second time.Its design philosophy is born dead load and train load jointly for bonding post-tensioned prestressing and external prestressing are arranged, and external prestressing also has the function of adjusting the deflection deformation of rail beam later stage.Consider that the distortion of no slag track later stage can adjust by fastener, can guarantee that track installs the back and keep state of axial compression.Prestressing tendon shape can not adopted corresponding with bending moment diagram parabola shaped, even part straight line post-tensioned prestressing bundle can be set, and can reduce prestressed consumption like this, reduces the bridge construction cost.For post-tensioning prestress with bond and external prestressing mixed configuration mode, external prestressing configuration quantity generally is advisable with balance mobile load moment of flexure, and this kind mode both can reduce creep deformation, but the later stage is adjusted distortion by adjusting stress state again.
Claims (3)
1, a kind of preparation method of concrete beam is characterized in that: described concrete beam prestressing force method to set up may further comprise the steps: a, formwork erection, assembling reinforcement; B, lay prestressing force bellows and prestress wire; C, concreting; D, treat that concrete reaches certain intensity after, the stretch-draw post-tensioned prestressing; E, be in the milk again, sealing off and covering anchorage; F, treat that duct mortar and sealing off and covering anchorage concrete reach the intensity of designing requirement, winch to beam strorage area and deposit; G, stretch-draw external prestressing; H, be in the milk again, sealing off and covering anchorage; I, treat that the intensity that duct mortar and sealing off and covering anchorage concrete reach designing requirement accurately locatees; J, attachment rail or other functor.
2, the preparation method of a kind of concrete beam according to claim 1, it is characterized in that: after beam body concreting reaches the intensity of designing requirement, stretch-draw post-tensioned prestressing single tension is finished, and corresponding pre-arch is set, and prestress wire is a parabola.
3, the preparation method of a kind of concrete beam according to claim 1 is characterized in that: stretch-draw is external pre-at once can be respectively to be provided with straight line posttension bundle at the upper limb and the lower edge of beam body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510023316 CN1644796A (en) | 2005-01-13 | 2005-01-13 | Production of concrete beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510023316 CN1644796A (en) | 2005-01-13 | 2005-01-13 | Production of concrete beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1644796A true CN1644796A (en) | 2005-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510023316 Pending CN1644796A (en) | 2005-01-13 | 2005-01-13 | Production of concrete beam |
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| CN (1) | CN1644796A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858123A (en) * | 2010-05-31 | 2010-10-13 | 白福波 | Prestressed concrete rigid frame cable beam |
| CN101935979A (en) * | 2010-08-10 | 2011-01-05 | 武汉理工大学 | Plain pre-stressed concrete continuous beam bridge |
| CN103616265A (en) * | 2013-10-28 | 2014-03-05 | 湖南省交通科学研究院 | Pipeline detector calibrating model making method and calibrating model |
| CN103898838A (en) * | 2014-04-09 | 2014-07-02 | 中交隧道工程局有限公司 | Temporary prestressed steel system of No.0 box girder |
-
2005
- 2005-01-13 CN CN 200510023316 patent/CN1644796A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858123A (en) * | 2010-05-31 | 2010-10-13 | 白福波 | Prestressed concrete rigid frame cable beam |
| CN101858123B (en) * | 2010-05-31 | 2011-12-28 | 白福波 | Prestressed concrete rigid frame cable beam elastic connecting to adjacent common beam |
| CN101935979A (en) * | 2010-08-10 | 2011-01-05 | 武汉理工大学 | Plain pre-stressed concrete continuous beam bridge |
| CN103616265A (en) * | 2013-10-28 | 2014-03-05 | 湖南省交通科学研究院 | Pipeline detector calibrating model making method and calibrating model |
| CN103616265B (en) * | 2013-10-28 | 2016-06-08 | 湖南省交通科学研究院 | Manufacture the method for pipeline detector peg model, peg model |
| CN103898838A (en) * | 2014-04-09 | 2014-07-02 | 中交隧道工程局有限公司 | Temporary prestressed steel system of No.0 box girder |
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Open date: 20050727 |