CN106567330A - Sectional anchoring structure for box girder internal prestressing tendon - Google Patents
Sectional anchoring structure for box girder internal prestressing tendon Download PDFInfo
- Publication number
- CN106567330A CN106567330A CN201610818517.0A CN201610818517A CN106567330A CN 106567330 A CN106567330 A CN 106567330A CN 201610818517 A CN201610818517 A CN 201610818517A CN 106567330 A CN106567330 A CN 106567330A
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- CN
- China
- Prior art keywords
- anchoring
- block
- auxiliary
- anchor
- prestressing tendon
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a sectional anchoring structure for a box girder internal prestressing tendon. The sectional anchoring structure for the box girder internal prestressing tendon comprises a main anchoring block, an auxiliary anchoring block, a main anchoring plate and an auxiliary anchoring plate, wherein the main anchoring block and the auxiliary anchoring block are arranged on a box girder bottom plate; the main anchoring plate and the auxiliary anchoring plate are respectively placed on the main anchoring block and the auxiliary anchoring block. A small part of the same prestressing tendon is anchored on the auxiliary anchoring block. Compared with the traditional anchoring method, the invention is advantaged in that cracks, caused by tensioning prestressing force, generated on the upper surface of an anchoring block surrounding bottom plate can be effectively prevented; crack-prevention steel bars around the anchoring blocks can be reduced; concrete is convenient to pour and vibrate; the dimensions of the anchoring blocks are also reduced; small-sized tensioning equipment can be adopted; and the tensioning operation is convenient to perform. The durability of the sectional anchoring structure can be enhanced and the service life of the sectional anchoring structure can be also prolonged.
Description
Technical field
The present invention relates in a kind of box beam prestressing tendon segmentation anchor structure, belong to science of bridge building field.
Background technology
Prestressed concrete member crack resistance is good, rigidity big, is widely used in science of bridge building field at present.But
It is that substantial amounts of prestressing tendon is needed in Longspan Bridge, and tension tonnage is very big.Substantial amounts of prestressed pore passage is reserved on section
Afterwards, compression area of the section in construction is seriously reduced, makes the compressive pre-stress in section higher, increased construction middle section
The risk of compression damage.Bridge beam slab occurs that drawing should after deformed bar stretch-draw anchor on the beam slab on the outside of anchor block
, easily there is crack in power area.This requires that around anchor block particularly rear increases anticracking reinforcing bar, causes the region reinforcing bar close
Collection, difficulty of vibrating in concreting process affects the quality of concrete.Because prestressing tendon contains more presstressed reinforcing steel,
Large-tonnage tensioning equipment is needed to enter inside box beam, tensioning operation is inconvenient.
The content of the invention
The present invention is solution the deficiencies in the prior art, there is provided the segmentation anchor structure of prestressing tendon in a kind of box beam.
The purpose of the present invention can be achieved through the following technical solutions.The segmentation anchoring knot of prestressing tendon in a kind of box beam
Structure, the main Bower Anchor block and Bower Anchor plate thereon included on box beam base plate, base plate, auxiliary anchor block and auxiliary anchor slab thereon are auxiliary
Help anchor block along duct direction positioned at the outside of Bower Anchor block, and the length of a Bower Anchor block is at least with the clear distance of Bower Anchor block, it is same
A small amount of presstressed reinforcing steel in prestressing tendon positioned at bottom is anchored in auxiliary anchor block.So, just have after Bower Anchor block in auxiliary anchor block
The compressive pre-stress that presstressed reinforcing steel applies, so that it may significantly improve the stress around Bower Anchor block, it is to avoid concrete cracking.Together
When, also can be only with small-sized prestress tensioning equipment.
Further, described structure is provided with prestressed pore passage branched connection members at prestressed strand shunting, with even
Connect each section of corresponding prestressed pore passage corrugated tube.To steel bellow, available iron leather makees prestressed pore passage branched connection members.
Further, aid in anchor slab curved.Because Bower Anchor plate is generally circular in cross section, the upper side of prestressing tendon is most
Steel strand anchoring aids in anchor slab that the remaining space in straightway main aperture road can be made full use of using arc on Bower Anchor plate, so as to
Reduce the cross dimension in duct.
Using the program, in tensioned prestressing bar, the presstressed reinforcing steel inside pretensioning Bower Anchor block, post-stretching auxiliary anchor block
Internal presstressed reinforcing steel.The presstressed reinforcing steel of anchoring can also adopt delayed bonding prestressed tendon, will have slow cohesion agent presstressed reinforcing steel with
Reinforcement installation, and subsequently casting concrete.After concrete reaches tensioning intensity requirement, the slow cohesion agent for now designing is not coagulated yet
Gu, prestressed tensioning operation is completed before its solidification.
The segmentation anchor structure of prestressing tendon may also be arranged on the top board of box beam in the box beam.
The relatively conventional anchoring process of the present invention, can effectively reduce the prestressed pore passage quantity dough-making powder in base plate cross section
Product, effectively prevents the crack produced in anchorage zone because of stretch-draw prestressing force, decreases the anticracking reinforcing bar around anchor block, is easy to coagulation
Pouring for soil is vibrated, and also reduces the size of anchor block, only uses less tensioning equipment, is easy to construction stretching operation.So as to can
To increase the durability and service life of structure.
Description of the drawings
The schematic diagram of Fig. 1 present invention,
Steel beam two ends adopt the schematic diagram of the present invention on Fig. 2 box beam base plates,
Steel beam two ends are using the schematic diagram of the present invention on Fig. 3 box beam top boards
The schematic diagram of Fig. 4 embodiments three,
Fig. 5 prestressed pore passage branched connection members schematic diagrams,
In above figure：1-Bower Anchor block, 2-auxiliary anchor block, 3-prestressing tendon, 4-box beam base plate, 5-Bower Anchor plate, 6- piggy-back anchors
Plate, the short beam splitting of 7-prestressing tendon, the long beam splitting of 8-prestressing tendon, 9-box beam top board, 10-beam-ends anchor slab, 11-in advance should
Power duct branched connection members.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment one
The structural representation of the present embodiment is shown in Fig. 2, in the base plate of box beam（4）On, prestressing tendon is installed（3）, to avoid pre- answering
Power beam（3）Two ends cause anchor block surrounding concrete to ftracture when respectively having an anchor block, in Bower Anchor block（1）Auxiliary anchor block is set afterwards（2）,
Bower Anchor block（1）With auxiliary anchor block（2）Between clear distance be a Bower Anchor block（1）Length.Correspondingly prestressing tendon（3）It is middle to take out 4
Root steel strand anchoring is in auxiliary anchor slab（6）On, remaining major part is still anchored at Bower Anchor plate（5）On.Pre- answering first is penetrated during construction
The long beam splitting of power beam（8）, then the short beam splitting for penetrating prestressing tendon（7）.During tensioning, the short beam splitting of pretensioning beam（7）, then
The long beam splitting of stretch-draw prestressing force beam（8）.Prestressed pore passage adopts steel bellow, makes as shown in Figure 5 pre- with iron sheet in advance
Stress duct branched connection members（11）, when corrugated tube is installed prestressed pore passage branched connection members are used（11）Each section of corrugated tube of connection.
Embodiment two
The structural representation of the present embodiment is shown in Fig. 3 and Fig. 5, and from unlike embodiment two, the structure setting of the present invention is in box beam
Top board（9）On, corrugated tube adopts plastic film capicitor.Correspondingly prestressed pore passage branched connection members（11）The plastics system of being also adopted by
Make.Prestressed pore passage branched connection members are used when corrugated tube is installed（11）Each section of plastic film capicitor of connection.
Embodiment three
Structural representation in the present embodiment is as shown in figure 4, in box beam bottom end, prestressing tendon anchors to the end section of base plate
Beam-ends anchor slab（10）On, one end of inner side adopts the segmentation anchor structure of the stress beam of the present invention.
Claims (3)
1. in a kind of box beam prestressing tendon segmentation anchor structure, it is characterised in that：Mainly include concrete box girder base plate, base plate
On Bower Anchor block and Bower Anchor plate thereon, auxiliary anchor block and auxiliary anchor slab thereon, auxiliary anchor block is located at Bower Anchor along duct direction
The outside of block, and the length of a Bower Anchor block is at least with the clear distance of Bower Anchor block, positioned at a small amount of of bottom in same prestressing tendon
Presstressed reinforcing steel is anchored on auxiliary anchor block.
2. in a kind of box beam according to claim 1 prestressing tendon segmentation anchor structure, it is characterised in that：Described knot
Structure is provided with prestressed pore passage branched connection members at prestressed strand shunting, to connect each section of corresponding prestressed pore passage ripple
Pipe.
3. in a kind of box beam according to claim 2 prestressing tendon segmentation anchor structure, it is characterised in that：Auxiliary anchor slab
It is curved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610818517.0A CN106567330A (en) | 2016-09-13 | 2016-09-13 | Sectional anchoring structure for box girder internal prestressing tendon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610818517.0A CN106567330A (en) | 2016-09-13 | 2016-09-13 | Sectional anchoring structure for box girder internal prestressing tendon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106567330A true CN106567330A (en) | 2017-04-19 |
Family
ID=58531765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610818517.0A Pending CN106567330A (en) | 2016-09-13 | 2016-09-13 | Sectional anchoring structure for box girder internal prestressing tendon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106567330A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110653918A (en) * | 2019-09-26 | 2020-01-07 | 中交一公局第六工程有限公司 | Construction method for synchronously pouring large-span corrugated steel inclined web precast beam with toothed block on top and bottom plates by post-tensioning method |
| CN111287457A (en) * | 2018-12-06 | 2020-06-16 | 深圳京创重工特种工程有限公司 | Construction method of anchoring tower barrel section |
| CN113338161A (en) * | 2021-04-15 | 2021-09-03 | 广东省交通规划设计研究院集团股份有限公司 | Concrete box girder top surface prestress steel beam tensioning structure and construction method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004003236A (en) * | 2002-04-04 | 2004-01-08 | Kajima Corp | Structure of joint between steel-concrete composite structure and reinforced concrete structure |
| CN101368369A (en) * | 2008-08-18 | 2009-02-18 | 中铁大桥勘测设计院有限公司 | Penetration type inhaul cable anchorage structure |
| KR20150051706A (en) * | 2013-11-05 | 2015-05-13 | 서울시립대학교 산학협력단 | Method for Manufacturing Prestressed Members without Prestressing Bed |
| CN205024584U (en) * | 2015-10-14 | 2016-02-10 | 郑州大学 | Pre -stressed reinforcement's segmentation anchor structure in case roof beam |
-
2016
- 2016-09-13 CN CN201610818517.0A patent/CN106567330A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004003236A (en) * | 2002-04-04 | 2004-01-08 | Kajima Corp | Structure of joint between steel-concrete composite structure and reinforced concrete structure |
| CN101368369A (en) * | 2008-08-18 | 2009-02-18 | 中铁大桥勘测设计院有限公司 | Penetration type inhaul cable anchorage structure |
| KR20150051706A (en) * | 2013-11-05 | 2015-05-13 | 서울시립대학교 산학협력단 | Method for Manufacturing Prestressed Members without Prestressing Bed |
| CN205024584U (en) * | 2015-10-14 | 2016-02-10 | 郑州大学 | Pre -stressed reinforcement's segmentation anchor structure in case roof beam |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287457A (en) * | 2018-12-06 | 2020-06-16 | 深圳京创重工特种工程有限公司 | Construction method of anchoring tower barrel section |
| CN110653918A (en) * | 2019-09-26 | 2020-01-07 | 中交一公局第六工程有限公司 | Construction method for synchronously pouring large-span corrugated steel inclined web precast beam with toothed block on top and bottom plates by post-tensioning method |
| CN110653918B (en) * | 2019-09-26 | 2021-08-10 | 中交一公局第六工程有限公司 | Construction method for synchronously pouring large-span corrugated steel inclined web precast beam with toothed block on top and bottom plates by post-tensioning method |
| CN113338161A (en) * | 2021-04-15 | 2021-09-03 | 广东省交通规划设计研究院集团股份有限公司 | Concrete box girder top surface prestress steel beam tensioning structure and construction method thereof |
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Application publication date: 20170419 |