CN205557288U - U -shaped prestressed structure of concrete box beam web and bottom plate - Google Patents
U -shaped prestressed structure of concrete box beam web and bottom plate Download PDFInfo
- Publication number
- CN205557288U CN205557288U CN201620214621.4U CN201620214621U CN205557288U CN 205557288 U CN205557288 U CN 205557288U CN 201620214621 U CN201620214621 U CN 201620214621U CN 205557288 U CN205557288 U CN 205557288U
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- Prior art keywords
- prestressed
- web
- shaped
- bottom plate
- straightway
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- 239000004567 concrete Substances 0.000 title claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract 6
- 239000010959 steel Substances 0.000 claims abstract 6
- 230000007704 transition Effects 0.000 claims description 15
- 238000010276 construction Methods 0.000 abstract description 9
- 210000002435 tendon Anatomy 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 239000011513 prestressed concrete Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- Rod-Shaped Construction Members (AREA)
Abstract
The utility model provides a U -shaped prestressed structure of concrete box beam web and bottom plate, include prestressed anchorage utensil, web straightway prestressed steel beam, bottom plate straightway prestressed steel beam, circular arc changeover portion prestressed steel beam, prestressing force PE sleeve pipe and prevent collapsing the reinforcing bar. Arrange through bottom plate at concrete box beam and web that the continuous prestressed steel beam of U -shaped applys bottom plate transverse prestress and web vertical prestressing to the problem of the complicated and construction difficulty of bottom plate transverse prestress strand structure has been solved, the big problem of loss of prestress of also having solved vertical prestressing tendons commonly used because length is short. Use this kind of prestressed structure, can provide bottom plate transverse prestress and web vertical prestressing simultaneously, can ensure single prestressing tendons's length, reduce because the ground tackle returns the loss of prestress who contracts and arouse. Bottom plate transverse prestress and web vertical prestressing sharing ground tackle can reduce ground tackle quantity and improve execution conditions just in roof stretch -draw, are favorable to reducing cost and convenient construction.
Description
Technical field
The utility model belongs to technical field of bridge engineering, relates to the U-shaped prestressed structure of a kind of concrete box web and base plate, in particular by the large span prestressed concrete box girder bridge of cantilever pouring construction.
Background technology
Large span prestressed concrete box girder bridge is at work progress and becomes bridge operation stage, and its web and base plate generally exist some stress or non-loaded deformation, and these cracks are the key factors affecting bridge durability and structural safety.The main cause producing above-mentioned crack is as follows:
1) large span prestressed concrete box girder bridge uses longitudinal prestressing mostly, web vertical and the prestress system of top board transverse prestress, owing to the reasons such as structure is complicated, difficulty of construction is high and loss of prestress is serious are typically not provided with base plate transverse prestress, cause box beam base plate temperature, concrete shrinkage effect under longitudinal crack easily occurs, in particular by the bridge of sections cantilever casting construction, owing to the contraction crack that the age of concrete, difference caused is more serious.
2) for box girder with varying depths, the longitudinal prestressing being arranged in base plate erects curved with base plate, the component outside the base plate plane that the presstressed reinforcing steel of vertical bending produces, and causes base plate longitudinal crack occur.
3) there is the feature that length is shorter, anchor draw-back length is big in common web vertical presstressed reinforcing steel, causes loss of prestress serious, causes shearing resistance deficiency access bridge weakened web.
Utility model content
The utility model provides a kind of U-shaped prestressed structure, by arranging that the continuous prestressed strand of U-shaped applies base plate transverse prestress and web vertical prestressing force at the base plate of concrete box girder and web, thus solve base plate lateral prestressing tendon structure complexity and the problem of constructional difficulties, also solve the conventional vertical prestressing bar problem that loss of prestress is big owing to length is shorter.
The technical solution of the utility model is:
A kind of concrete box web and the U-shaped prestressed structure of base plate, including prestressed anchor, web straightway prestressed strand, base plate straightway prestressed strand, arc transition section prestressed strand, prestressing force PE sleeve pipe with anti-collapse reinforcing bar, needing in concrete box web and base plate according to certain spacing layout U-shaped prestressed structure according to actual loading, the agent structure of U-shaped prestressed structure is U-shaped prestressed strand, is embedded with prestressing force PE sleeve pipe outside U-shaped prestressed strand；U-shaped prestressed strand includes web straightway prestressed strand, base plate straightway prestressed strand and arc transition section prestressed strand；Arrange at arc transition section prestressed strand and prevent collapsing reinforcing bar；Arc transition section prestressed strand is that 1.0～1.5m circular arcs carry out transition by radius, and prestressed anchor is arranged at box beam top board, uses two ends stretching construction.
Effect of the present utility model and benefit be: U-shaped prestressed structure can provide base plate transverse prestress and web vertical prestressing force simultaneously；U prestressed structure can ensure that the length of single presstressed reinforcing steel, thus reduces the loss of prestress caused due to anchorage retraction；Base plate transverse prestress and web vertical prestressing force share anchorage and in top board stretch-draw, can reduce anchorage quantity and improve execution conditions, advantageously reducing cost and convenient construction.
Accompanying drawing explanation
Accompanying drawing is concrete box web and base plate U-shaped prestressed structure layout drawing.
In figure: 1 prestressed anchor；2-1 web straightway prestressed strand；2-2 base plate straightway prestressed strand；2-3 arc transition section prestressed strand；3 prestressing force PE sleeve pipes；4 prevent collapsing reinforcing bar.
Detailed description of the invention
Detailed description of the invention of the present utility model is described in detail below in conjunction with technical scheme and accompanying drawing.
A kind of concrete box web and the U-shaped prestressed structure of base plate, including prestressed anchor 1, web straightway prestressed strand 2-1, base plate straightway prestressed strand 2-2, arc transition section prestressed strand 2-3, prestressing force PE sleeve pipe 3 with anti-collapse reinforcing bar 4.Needing according to certain spacing layout U-shaped prestressed structure in concrete box web and base plate according to actual loading, the agent structure of U-shaped prestressed structure is U-shaped prestressed strand, is embedded with prestressing force PE sleeve pipe 3 outside U-shaped prestressed strand；U-shaped prestressed strand includes web straightway prestressed strand 2-1, base plate straightway prestressed strand 2-2 and arc transition section prestressed strand 2-3；Arrange at arc transition section prestressed strand 2-3 and prevent collapsing reinforcing bar 4；Arc transition section prestressed strand 2-3 is that 1.0～1.5m circular arcs carry out transition by radius, and prestressed anchor 1 is arranged at box beam top board, uses two ends stretching construction.
The U-shaped prestressed structure of the utility model concrete box web and base plate solve prior art problem Specific construction flow process as follows:
(1) colligation box beam regular reinforcement.
(2) it is accurately positioned also prestressed PE sleeve pipe, and colligation is prevented collapsing reinforcing bar.
(3) U-shaped prestressed strand is penetrated in prestressing force PE sleeve pipe, two ends prestressed anchorage.
(4) box beam concrete is poured.
(5) after box beam concrete reaches design or related specifications prescribed strength, in box beam roof symmetric stretch-draw U-shaped prestressed strand.
(6) U-shaped prestressed stretch-draw is complete, and at box beam top board, stretching notch carries out sealing off and covering anchorage process.
Claims (1)
1. a concrete box web and the U-shaped prestressed structure of base plate, it is characterised in that this U-shaped prestressing force
Structure includes prestressed anchor, web straightway prestressed strand, base plate straightway prestressed strand, circular arc
Changeover portion prestressed strand, prestressing force PE sleeve pipe and anti-collapse reinforcing bar；Needs according to actual loading are at concrete
U-shaped prestressed structure, the master of U-shaped prestressed structure is arranged according to certain spacing in box girder web and base plate
Body structure is U-shaped prestressed strand, is embedded with prestressing force PE sleeve pipe outside U-shaped prestressed strand；U-shaped is pre-
Stress steel bundle includes that web straightway prestressed strand, base plate straightway prestressed strand and arc transition section are pre-
Stress steel bundle；Arrange at arc transition section prestressed strand and prevent collapsing reinforcing bar；Arc transition section prestressed strand
Being that 1.0～1.5m circular arcs carry out transition by radius, prestressed anchor is arranged at box beam top board, uses two ends to open
Draw setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620214621.4U CN205557288U (en) | 2016-03-18 | 2016-03-18 | U -shaped prestressed structure of concrete box beam web and bottom plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620214621.4U CN205557288U (en) | 2016-03-18 | 2016-03-18 | U -shaped prestressed structure of concrete box beam web and bottom plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205557288U true CN205557288U (en) | 2016-09-07 |
Family
ID=56814325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620214621.4U Expired - Fee Related CN205557288U (en) | 2016-03-18 | 2016-03-18 | U -shaped prestressed structure of concrete box beam web and bottom plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205557288U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648890A (en) * | 2016-03-18 | 2016-06-08 | 大连理工大学 | U-shaped prestressed structure for webs and bottom board of concrete box beam |
-
2016
- 2016-03-18 CN CN201620214621.4U patent/CN205557288U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648890A (en) * | 2016-03-18 | 2016-06-08 | 大连理工大学 | U-shaped prestressed structure for webs and bottom board of concrete box beam |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160907 Termination date: 20170318 |
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| CF01 | Termination of patent right due to non-payment of annual fee |