CN105735134A - Temporary tensioning method for stub matching prefabricated box girders - Google Patents
Temporary tensioning method for stub matching prefabricated box girders Download PDFInfo
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- CN105735134A CN105735134A CN201610152395.6A CN201610152395A CN105735134A CN 105735134 A CN105735134 A CN 105735134A CN 201610152395 A CN201610152395 A CN 201610152395A CN 105735134 A CN105735134 A CN 105735134A
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- fitting
- built
- hole
- cone
- shearing
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a temporary tensioning method for stub matching prefabricated box girders. The method includes the following steps that firstly, an embedding position of a shearing force cone is reserved on each box girder; secondly, the shearing force cone is inserted in each embedding hole and is attached to and abuts against part of the wall face of each embedding position; and thirdly, through holes where precision rolled thread steel penetrates are formed in the parts, extending out of the embedding holes, of the shearing force cones on the two adjacent box girders, the two ends of the precision rolled thread steel penetrate the through holes in the shearing force cones on the two adjacent box girders and are temporarily tensioned through two centre hole jacks and fastened through two nuts located on the outer sides of the shearing force cones, so that the nuts are tightly attached to the shearing force cones, the centre hole jacks are detached, and the precision rolled thread steel is matched with the nuts to anchor and tension the shearing force cones on the two adjacent box girders. By the adoption of the method, the problems that repair is troublesome due to the fact that through bolt holes are reserved in the prior art, and water is likely to leak in a later period are solved.
Description
Technical field
The present invention relates to bridge box and beam sections short-term coupling precast assembly construction field.It is more particularly related to the interim method for stretching of a kind of short-term coupling prefabricated case beam.
Background technology
At present, slug matching prefabricated in U.S., Europe, Japan, Southeast Asia and China Hong Kong etc. ground application relatively broad, such as AngChuan Zhou, Hong Kong bridge, T9 main line etc..In China mainland area, application is less, and only bridge haunt and plague is opened in Su-tong Yangtze River highway bridge, Xiamen collection U.S. bridge, Shanghai, Nanjing Si Qiao, the good engineering project such as bridge, Xia-Zhang Brigde that continues adopt this technology.
In beginning a project, box beam needs to first pass through interim prestressing force at erection stage and carries out stretch-draw, then is permanent prestressing force by stretch-draw system transition.Traditional interim prestressing force adopts pre-buried pipeline, steel-tooth bank and fining twisted steel to combine stretch-draw to drawing, namely it is fixed on box beam concrete face by anchor bolt, anchor bolt need to reserve pipe laying in box beam concrete, stretch-draw system passes through anchor bolt and anti-shear concrete, and two steel-tooth banks are connected with each other by fining twisted steel stretch-draw；Causing top board hole many, anchor bolt construction is loaded down with trivial details, and box beam concrete patch work amount is big, and very easily causes top board infiltration, leaks.
Summary of the invention
It is an object of the invention to solve at least the above, and the advantage that at least will be described later is provided.
It is a still further object of the present invention to provide a kind of interim prestressed construction method, solve and caused repairing trouble due to reserved through bolt hole in the past, and the problem that the later stage easily leaks.
It is a still further object of the present invention to provide a kind of interim prestressed construction method, accurate positioning, installation and dismounting are quick, and efficiency of construction is greatly improved and cost reduces.
In order to realize these purposes according to the present invention and further advantage, it is provided that the interim method for stretching of a kind of short-term coupling prefabricated case beam, comprise the following steps:
Step one, the pre-buried position that reserved shearing is bored in box beam, described box beam its pre-buried position after building is made to form embedded hole, described embedded hole by constitute for the first up big and down small round platform hole, cylindrical hole and the second up-small and down-big round platform hole from lower, wherein, the basal diameter that described first round platform bore dia is less basal diameter, the diameter of described cylindrical hole and described second round platform bore dia are less is identical；
Step 2, in described embedded hole insert shearing cone, the top of the wherein side of the insertion portion of described shearing cone is formed with arc-shaped curved surface first projection consistent with described first round platform radial degree, the bottom of the upper side relative with described first projection of described shearing cone is formed with arc-shaped curved surface second projection consistent with described second round platform radial degree, fitting and offset in described first projection and described first round platform hole, fits and offset in described second projection and described second round platform hole；
Shearing cone in step 3, two adjacent box beams stretches out the part of described embedded hole and is provided with the through hole being available for fining twisted steel traverse, the through hole of the two ends of fining twisted steel are each passed through in two adjacent box beams shearing cone, respectively the two ends of described fining twisted steel are carried out interim stretch-draw by two centre-hole jacks, and the two ends of described fining twisted steel are fastened respectively with two nuts being positioned at shearing cone outside, described nut is made to be close to described shearing cone, punching jack described in removal, makes fining twisted steel coordinate the shearing cone in the adjacent box beam of screw cap anchoring stretch-draw two.
Preferably, in described step one, the forming method of described embedded hole is:
Make shearing cone built-in fitting, described shearing cone built-in fitting is made up of upper built-in fitting and lower built-in fitting, described upper built-in fitting is up big and down small frustum cone structure, described lower built-in fitting is that top is divided into cylinder, bottom to be divided into the structure of truncated cone-shaped, and the upper and bottom section of described lower built-in fitting is formed in one；Wherein, described lower built-in fitting is that rigid foam is made；
Before box beam concrete is built, the pre-buried position of reserved described shearing cone built-in fitting, arranges tie hoop in described pre-buried position, described shearing is bored built-in fitting and is placed in described tie hoop and casting concrete；Remove described upper built-in fitting and described lower built-in fitting after having built, namely described box beam is formed described embedded hole.
Preferably, described first bump height is lower than the height of described embedded hole end face；Described second projection is near the bottom surface of described embedded hole.
Preferably, described first projection is seamless applying with a part of curved surface in described first round platform hole；A part of curved surface in described second projection and described second round platform hole is seamless applying.
Preferably, described upper built-in fitting is nylon material.
Preferably, the top of described shearing cone is provided with handle.
Preferably, described upper built-in fitting and described lower built-in fitting contact surface adopt tenon structure to fix, and it is equipped with screw rod along two kinds of longitudinal directions between described upper built-in fitting and described lower built-in fitting, the top and bottom of described screw rod are fixed respectively through nut and described upper built-in fitting, described lower built-in fitting, wherein, the upper surface of described lower built-in fitting and lower surface are positioned at the position of screw rod traverse and are provided with annular steel plate washer.
Preferably, described shearing cone is made for steel.
The present invention at least includes following beneficial effect:
1, set aside pre-embedded hole in box beam concrete, puts into preformed hole by shearing cone, and shearing cone utilizes surrounding concrete shearing resistance with embedded hole is closely coupled, anchors two shearing cones of stretch-draw again through fining twisted steel；By the connected two tight stretch-draw of Pin beam section of section assembling together.This prestress system is installed, is removed fast, and efficiency of construction is greatly improved, and need not reserve through bolt hole, it is easy to repairs, will not leak；
2, in prefabricated box-beam process, shearing cone built-in fitting construction is simpler than the construction of steel-tooth bank built-in pipe, and embedded part precision requires to reduce, and efficiency of construction is greatly promoted.
3, in interim prestressed stretch-draw process, shearing cone is torn open simple, quick than steel-tooth bank peace, and efficiency of construction is high and can repeatedly have enough to meet the need use, be substantially reduced interim measure cost.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part is also by by being understood by those skilled in the art the research of the present invention and practice.
Accompanying drawing explanation
Fig. 1 is the structural representation that short-term of the present invention coupling prefabricated case beam carries out interim stretch-draw；
Fig. 2 be the present invention under pre-stressed state, shearing cone stressing conditions schematic diagram；
Fig. 3 is the structural representation of shearing of the present invention cone；
Fig. 4 is the structural representation of embedded hole of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail, to make those skilled in the art can implement according to this with reference to description word.
It should be noted that experimental technique described in following embodiment, if no special instructions, it is conventional method, described reagent and material, if no special instructions, all commercially obtains；In describing the invention, term " transverse direction ", " longitudinal direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, be not instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
As Figure 1-4, the present invention provides the interim method for stretching of a kind of short-term coupling prefabricated case beam, respectively two box beam S01# and the S02# needing stretch-draw is carried out following steps:
Step one, in box beam the pre-buried position of reserved shearing cone 2, described box beam its pre-buried position after building is made to form embedded hole 3, described embedded hole 3 by constitute for the first up big and down small round platform hole, cylindrical hole and the second up-small and down-big round platform hole from lower, wherein, the basal diameter that described first round platform bore dia is less basal diameter, the diameter of described cylindrical hole and described second round platform bore dia are less is identical；
Step 2, in described embedded hole 3 insert shearing cone 2, the top of the wherein side of the insertion portion of described shearing cone 2 is formed with arc-shaped curved surface first projection 23 consistent with described first round platform radial degree, the bottom of side relative with described first projection 23 on described shearing cone 2 is formed with arc-shaped curved surface second projection 24 consistent with described second round platform radial degree, described first projection 23 is fitted with described first round platform hole and is offseted, and described second projection 24 is fitted with described second round platform hole and offseted；
Step 3, the part that shearing cone 2 on two adjacent box beam S01# and S02# stretches out described embedded hole 3 is provided with the through hole being available for fining twisted steel 4 traverse, the through hole of the two ends of fining twisted steel 4 are each passed through in two adjacent box beams shearing cone, respectively the two ends of described fining twisted steel 4 are carried out interim stretch-draw by two centre-hole jacks, and the two ends of described fining twisted steel 4 are fastened respectively with two nuts 5 being positioned at outside shearing cone 2, described nut 5 is made to be close to described shearing cone 2, punching jack described in removal, make the shearing cone 2 that fining twisted steel 4 coordinates nut 5 to anchor in the adjacent box beam of stretch-draw two.
In prior art, carry out the box beam of interim stretch-draw is respectively provided with pre-buried pipeline, steel-tooth bank and fining twisted steel 4 at two needs, steel-tooth bank requires over the concrete surface of multiple anchor bolt and box beam and is fixed, one by one anchor bolt is fixed operation loaded down with trivial details, and after later stage interim stretch-draw terminates, the accessories such as steel-tooth bank, anchor bolt need to be removed, cause box beam top board hole many simultaneously, the patch work amount of box beam concrete is big, top board infiltration and drainage also very easily occur after reparation, have impact on the quality of box beam.
Technique scheme is according to prior art Problems existing, devise a kind of interim method for stretching mating prefabricated case beam for short-term, penetrate in box beam concrete without a large amount of anchor bolts and be fixed, only need in box beam set aside pre-embedded hole 3, later stage easily repairs and antileaking, hole without reserved anchor bolt, again through putting into the shearing cone 2 supporting with embedded hole 3, utilize the shearing resistance of surrounding concrete, the first projection 23 on 2 is bored by shearing, second projection 24 respectively with the first round platform hole of embedded hole 3 in corresponding box beam, second round platform hole is closely coupled, 2 are bored again through the shearing in two adjacent box beams of fining twisted steel 4 stretch-draw, achieve by the connected two Pin tight stretch-draw of beam section S01# and S02# of section assembling together.The working procedure that shearing cone 2 puts into embedded hole 3 is simply many compared to the construction of steel-tooth bank, and only need to position embedded hole 3, and steel-tooth bank needs 6 anchor bolts to fix, and easily moves, not easily position in fixing construction, it can thus be appreciated that present invention location is more accurate.Shearing cone 2 peace of the present invention is torn open simple, quick, and efficiency of construction is greatly improved, and can Reusability, greatly reduce the cost of interim pre-stress construction.
In another kind of technical scheme, in described step one, the forming method of described embedded hole 3 is:
Make shearing cone built-in fitting 1, described shearing cone built-in fitting 1 is made up of upper built-in fitting 11 and lower built-in fitting 12, described upper built-in fitting 11 is up big and down small frustum cone structure, described lower built-in fitting 12 is divided into cylinder, bottom to be divided into the structure of truncated cone-shaped for top, and the upper and bottom section of described lower built-in fitting 12 is formed in one；Wherein, described lower built-in fitting 12 is made for rigid foam；
Before box beam concrete is built, the pre-buried position of reserved described shearing cone built-in fitting 1, arranges tie hoop in described pre-buried position, described shearing is bored built-in fitting 1 and is placed in described tie hoop and casting concrete；Remove described upper built-in fitting 11 and described lower built-in fitting 12 after having built, namely described box beam is formed described embedded hole 3.
In technique scheme, the formation of embedded hole 3 is preferably before box beam concrete is built, this shearing is bored built-in fitting 1 and is embedded into pre-buried position, it is fixing so that shearing to be bored built-in fitting 1 that pre-buried position arranges tie hoop, achieve being accurately positioned of embedded hole 3, after concrete setting, only need to extract built-in fitting 11, lower built-in fitting 12 is rooted out with hard tool, namely embedded hole 3 is defined, lower built-in fitting 12 is set to rigid foam and solves owing to the bottom of lower built-in fitting 12 is divided into frustum cone structure, the problem cannot extracted out after concrete setting, directly root out, it is damaged from the concrete wall contacted simultaneously.Rigid foam cost is low, easily processes, and only need to produce new lower built-in fitting 12 and fix can reuse with upper built-in fitting 11 before again.
In another kind of technical scheme, described first projection 23 height is lower than the height of described embedded hole 3 end face, and the first projection 23 is lower than box beam hole end face; it is because box beam top board matcoveredn thickness; plain concrete can not stress, simultaneously in order to prevent stress from concentrating, cause box beam end face concrete destruction.Described second projection 24 is higher than the bottom surface of described embedded hole 3；Second projection 24 height and reserving hole bottom surface, space required during reservation tear down shearing cone.
In another kind of technical scheme, a part of curved surface in described first projection 23 and described first round platform hole is seamless applying；A part of curved surface in described second projection 24 and described second round platform hole is seamless applying.
In another kind of technical scheme, described upper built-in fitting 11 is nylon material.Can Reusability, save interim pre-stress construction cost.
In another kind of technical scheme, the top of described shearing cone 2 is provided with handle 21.Shearing cone 2 is extracted during convenient dismounting.
In another kind of technical scheme, described upper built-in fitting 11 and described lower built-in fitting 12 contact surface adopt tenon structure to fix, and it is equipped with screw rod along two kinds of longitudinal directions between described upper built-in fitting 11 and described lower built-in fitting 12, the top and bottom of described screw rod are fixed with described upper built-in fitting 11, described lower built-in fitting 12 respectively through nut, wherein, the upper surface of described lower built-in fitting 12 and lower surface are positioned at the position of screw rod traverse and are provided with annular steel plate washer.Annular steel plate washer is set and prevents the bolt destruction to lower built-in fitting 12, and can not firmly fix with upper built-in fitting 11.
In another kind of technical scheme, described shearing cone 2 is made for steel.
In technique scheme, the method for dismounting of shearing cone 2 is: first by coordinating nut removal on fining twisted steel 4, discharge interim prestressing force, is beaing shearing cone 2 gently, makes shearing cone 2 be slightly tilted, and shearing can easily be bored 2 dismountings.
Although embodiment of the present invention are disclosed as above, but listed utilization that it is not restricted in description and embodiment, it can be applied to various applicable the field of the invention completely, for those skilled in the art, it is easily achieved other amendment, therefore, under the general concept limited without departing substantially from claim and equivalency range, the present invention is not limited to specific details and shown here as the legend with description.
Claims (8)
1. the interim method for stretching of a short-term coupling prefabricated case beam, it is characterised in that comprise the following steps:
Step one, the pre-buried position that reserved shearing is bored in box beam, described box beam its pre-buried position after building is made to form embedded hole, described embedded hole by constitute for the first up big and down small round platform hole, cylindrical hole and the second up-small and down-big round platform hole from lower, wherein, the basal diameter that described first round platform bore dia is less basal diameter, the diameter of described cylindrical hole and described second round platform bore dia are less is identical；
Step 2, in described embedded hole insert shearing cone, the top of the wherein side of the insertion portion of described shearing cone is formed with arc-shaped curved surface first projection consistent with described first round platform radial degree, the bottom of the upper side relative with described first projection of described shearing cone is formed with arc-shaped curved surface second projection consistent with described second round platform radial degree, fitting and offset in described first projection and described first round platform hole, fits and offset in described second projection and described second round platform hole；
Shearing cone in step 3, two adjacent box beams stretches out the part of described embedded hole and is provided with the through hole being available for fining twisted steel traverse, the through hole of the two ends of fining twisted steel are each passed through in two adjacent box beams shearing cone, respectively the two ends of described fining twisted steel are carried out interim stretch-draw by two centre-hole jacks, and the two ends of described fining twisted steel are fastened respectively with two nuts being positioned at shearing cone outside, described nut is made to be close to described shearing cone, punching jack described in removal, makes fining twisted steel coordinate the shearing cone in the adjacent box beam of screw cap anchoring stretch-draw two.
2. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 1, it is characterised in that in described step one, the forming method of described embedded hole is:
Make shearing cone built-in fitting, described shearing cone built-in fitting is made up of upper built-in fitting and lower built-in fitting, described upper built-in fitting is up big and down small frustum cone structure, described lower built-in fitting is that top is divided into cylinder, bottom to be divided into the structure of truncated cone-shaped, and the upper and bottom section of described lower built-in fitting is formed in one；Wherein, described lower built-in fitting is that rigid foam is made；
Before box beam concrete is built, the pre-buried position of reserved described shearing cone built-in fitting, arranges tie hoop in described pre-buried position, described shearing is bored built-in fitting and is placed in described tie hoop and casting concrete；Remove described upper built-in fitting and described lower built-in fitting after having built, namely described box beam is formed described embedded hole.
3. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 1, it is characterised in that described first bump height is lower than the height of described embedded hole end face；Described second projection is near the bottom surface of described embedded hole.
4. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 4, it is characterised in that a part of curved surface in described first projection and described first round platform hole is seamless applying；A part of curved surface in described second projection and described second round platform hole is seamless applying.
5. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 4, it is characterised in that described upper built-in fitting is nylon material.
6. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 1, it is characterised in that the top of described shearing cone is provided with handle.
7. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 2, it is characterized in that, described upper built-in fitting and described lower built-in fitting contact surface adopt tenon structure to fix, and it is equipped with screw rod along two kinds of longitudinal directions between described upper built-in fitting and described lower built-in fitting, the top and bottom of described screw rod are fixed respectively through nut and described upper built-in fitting, described lower built-in fitting, wherein, the upper surface of described lower built-in fitting and lower surface are positioned at the position of screw rod traverse and are provided with annular steel plate washer.
8. the interim method for stretching of short-term coupling prefabricated case beam as claimed in claim 1, it is characterised in that described shearing cone is made for steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610152395.6A CN105735134B (en) | 2016-03-17 | 2016-03-17 | Temporary tensioning method for stub matching prefabricated box girders |
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| CN201610152395.6A CN105735134B (en) | 2016-03-17 | 2016-03-17 | Temporary tensioning method for stub matching prefabricated box girders |
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| CN105735134B CN105735134B (en) | 2017-05-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106835997A (en) * | 2017-03-21 | 2017-06-13 | 中国葛洲坝集团第二工程有限公司 | Steel box-girder lifts interim accurate positioning device and localization method |
| CN107524164A (en) * | 2017-08-30 | 2017-12-29 | 中交第二航务工程局有限公司 | Ultrashort beam pre-stress stretching method |
| CN108677729A (en) * | 2018-06-19 | 2018-10-19 | 中国铁路总公司 | A kind of interim prestressing apparatus for precast segment spliced girder |
| CN113512934A (en) * | 2021-07-08 | 2021-10-19 | 中铁第五勘察设计院集团有限公司 | Temporary connection structure of prefabricated spliced bridge and prefabricated beam section |
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| KR20090042220A (en) * | 2009-04-09 | 2009-04-29 | (주)대우건설 | Match-casting concrete form and construction method for constructing assembling-type precast pier using thereof |
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| CN106835997A (en) * | 2017-03-21 | 2017-06-13 | 中国葛洲坝集团第二工程有限公司 | Steel box-girder lifts interim accurate positioning device and localization method |
| CN107524164A (en) * | 2017-08-30 | 2017-12-29 | 中交第二航务工程局有限公司 | Ultrashort beam pre-stress stretching method |
| CN108677729A (en) * | 2018-06-19 | 2018-10-19 | 中国铁路总公司 | A kind of interim prestressing apparatus for precast segment spliced girder |
| CN113512934A (en) * | 2021-07-08 | 2021-10-19 | 中铁第五勘察设计院集团有限公司 | Temporary connection structure of prefabricated spliced bridge and prefabricated beam section |
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| CN105735134B (en) | 2017-05-17 |
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