CN106436583B - A kind of interim stretch-draw anchor suspension device of great cantilever bent cap and its construction method - Google Patents
A kind of interim stretch-draw anchor suspension device of great cantilever bent cap and its construction method Download PDFInfo
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- CN106436583B CN106436583B CN201610900956.6A CN201610900956A CN106436583B CN 106436583 B CN106436583 B CN 106436583B CN 201610900956 A CN201610900956 A CN 201610900956A CN 106436583 B CN106436583 B CN 106436583B
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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
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Abstract
The present invention provides a kind of interim stretch-draw anchor suspension device of great cantilever bent cap, including the pre-buried round steel pipe of bent cap being set on large span bent cap, the pre-buried round steel pipe of cushion cap on cushion cap, and the multiple standard knot fining twisted steels connected by rebar sleeve, the pre-buried round steel pipe of bent cap is correspondingly arranged with the pre-buried round steel pipe upper and lower position of cushion cap, multiple standard knot fining twisted steels are in turn connected to form screw thread steel column, the upper end of screw thread steel column passes through the pre-buried round steel pipe of bent cap, end successively uses screw thread billet, screw thread steel washer, screw-thread steel nut is fixed, the lower end of screw thread steel column screws in the pre-buried round steel pipe of cushion cap and fixes.The present invention also provides a kind of construction methods of the interim stretch-draw anchor suspension device of great cantilever bent cap.Construction process of the invention is few, and method is simple.It need to only be carried out when pouring bent cap and cushion cap pre-buried, when Bridge Erector will be in place using a small amount of manually installed fining twisted steel, a large amount of personnel and equipment investment can be saved compared to other construction methods, it is applied widely.
Description
Technical field
The present invention relates to Summarized Account of Bridge Erection Construction technical field, specifically the interim stretch-draw anchor suspension device of great cantilever bent cap and its apply
Work method.
Background technique
In the erecting beam construction of city, in order to adapt to the road network of city complexity, the setting of pier stud can not be often evenly distributed.
In crossing region in order not to isolate existing highway, the bridge of setting large span is generally required, and due to the design of bridge structure
The length needs of limitation, box beam are consistent, therefore produce the bent cap structure of large span.
When setting up the box beam of these large spans, supporting leg can stand in large span bent cap Bridge Erector for standard across erection
Cantilever segment can cause huge moment of flexure to bent cap and pier stud and be more than its structural strength.Current general solution is in frame
Temporary rest pier is arranged in the underface of the main supporting leg of bridge machine.Load when using the program by girder erection by bridging machine passes through temporary rest pier
It is directly delivered to ground, moment of flexure will not be generated to pier stud, while bent cap is subjected only to normal pressure, preferably resolve Bridge Erector progress
At large span bent cap the problem of Precast Concrete Segmental Bridges box beam erection.
However both need to process or lease temporary rest pier using above-mentioned temporary rest pier scheme, it is also desirable to temporary rest pier into
Row is set up, dismantles, and will be a bigger cost payout herein, while also tending to become a control in work of setting a roof beam in place
Property engineering.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of interim stretch-draw anchor supporting dress of great cantilever bent cap
It sets and its construction method, replaces the biggish temporary support of the scale of construction using fining twisted steel, construction process is few, and method is simple.
A kind of interim stretch-draw anchor suspension device of great cantilever bent cap, including the pre-buried round steel of bent cap being set on large span bent cap
Pipe, the pre-buried round steel pipe of the cushion cap on cushion cap and the multiple standard knot fining twisted steels connected by rebar sleeve, lid
The pre-buried round steel pipe of beam is correspondingly arranged with the pre-buried round steel pipe upper and lower position of cushion cap, and multiple standard knot fining twisted steels are in turn connected to form
Screw thread steel column, the upper end of screw thread steel column pass through the pre-buried round steel pipe of bent cap, end successively use screw thread billet, screw thread steel washer,
Screw-thread steel nut is fixed, and the lower end of screw thread steel column screws in the pre-buried round steel pipe of cushion cap and fixes.
Further, the lower loop of the pre-buried round steel pipe of cushion cap is arranged with spiral busting reinforcement, the bottom of spiral busting reinforcement
Equipped with cushion cap Pressure-bearing pads, spiral busting reinforcement and cushion cap Pressure-bearing pads are for preventing concrete from rupturing during stress.
Further, fastening nut is welded on cushion cap Pressure-bearing pads, the lower end of screw thread steel column passes through the pre-buried round steel of cushion cap
Fastening nut is screwed in after pipe.
Further, cushion cap Pressure-bearing pads are also welded with the fastening nut protection cap protected to fastening nut, fastening
Nut protection cap is located at fastening nut lower part.
A kind of construction method of the interim stretch-draw anchor suspension device of great cantilever bent cap, includes the following steps:
Step 1: forming the pre-buried round steel pipe of bent cap in the pre-buried round steel pipe of design position when large span bent cap is poured, holding
The pre-buried pre-buried round steel pipe in round steel pipe position of bent cap, Pressure-bearing pads are corresponded to when platform pours, screw-thread steel nut forms the pre-buried round steel of cushion cap
Pipe；
Step 2: multiple standard knot fining twisted steels are in turn connected to form screw thread steel column, the upper end of screw thread steel column passes through lid
The pre-buried round steel pipe of beam, end are successively fixed using screw thread billet, screw thread steel washer, screw-thread steel nut, the lower end of screw thread steel column
The pre-buried round steel pipe of cushion cap is screwed in fix.
Further, fastening nut is welded on cushion cap Pressure-bearing pads, the lower end of screw thread steel column passes through the pre-buried circle of cushion cap
Fastening nut is screwed in after steel pipe.
The present invention is few using the mode construction process that interim screw-thread steel pulling bent cap mode replaces temporary rest pier to prop up bent cap,
Installation is simple, and material therefor is few, it is only necessary to carried out when pouring bent cap and cushion cap it is pre-buried, when Bridge Erector will be in place using a small amount of
Manually installed fining twisted steel can save a large amount of personnel and equipment investment compared to other construction methods, not only effect
Height, and cost is low compared with temporary rest pier is used, and especially under the operating condition of high pier stud, advantage is particularly evident.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the interim stretch-draw anchor suspension device of great cantilever bent cap of the present invention；
Fig. 2 is the pre-buried and reserved schematic diagram on bent cap of the present invention；
Fig. 3 is the pre-buried and reserved schematic diagram on cushion cap of the present invention；
Fig. 4 is the structural schematic diagram of fining twisted steel of the present invention；
Fig. 5 is the construction schematic diagram that the prior art uses temporary rest pier.
In figure: 1-has set a roof beam in place piece, 2-bridge formation owner's supporting legs, 3-large span bent caps, 4-pier studs, 5-great cantilever bent caps
Interim stretch-draw anchor suspension device, 6-cushion caps, the pre-buried round steel pipe of 7-bent caps, the pre-buried round steel pipe of 8-cushion caps, 9-rubber stoppers,
10-spiral busting reinforcements, 11-cushion cap Pressure-bearing pads, 12-fastening nuts, 13-fastening nut protection caps, 14-screw-thread steels
Backing plate, 15-screw thread steel washers, 16-adjust section fining twisted steel, 17-screw-thread steel nuts, 18-rebar sleeves, 19-marks
Quasi- section fining twisted steel, 20-temporary rest piers.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, the technical solution in the present invention is clearly and completely described.
Fig. 1 is the box beam erection using the interim stretch-draw anchor suspension device 5 of great cantilever bent cap of the present invention to large span bent cap 3
The arrangement schematic diagram of gib is carried out, it can be seen from the figure that the interim stretch-draw anchor suspension device 5 of the great cantilever bent cap
Setting is not full symmetric with 2 positions of bridge formation owner supporting leg, and the purpose being arranged in this way is to mutually fit with the position of lower part cushion cap 6
Bridge formation owner supporting leg 2 should be combined and set a roof beam in place piece 1 give large span bent cap 3 apply load condition.Great cantilever bent cap is interim
The setting position of stretch-draw anchor suspension device 5 should be determined by calculation according to the difference of project.
Fig. 2 shows the pre-buried and reserved arrangement on large span bent cap 3.Anchor great cantilever bent cap is determined according to above-mentioned calculating
After the diameter of the screw-thread steel of interim stretch-draw anchor suspension device 5 and position, when large span bent cap 3 is constructed, corresponding position is buried
If the diameter of the pre-buried round steel pipe 7 of bent cap, the pre-buried round steel pipe 7 of bent cap is 10mm bigger than fining twisted steel diameter, so as to fining twisted steel
Installation.
Fig. 3 shows the pre-buried and reserved arrangement on cushion cap 6.The interim tensioning of great cantilever bent cap is determined according to above-mentioned calculating
After the diameter of the screw-thread steel of anchoring support device 5 and position, when cushion cap 6 is constructed, corresponding position and respective depth, which are buried, is held
The pre-buried round steel pipe 8 of platform, rubber stopper 9, spiral busting reinforcement 10, cushion cap Pressure-bearing pads 11, fastening nut 12, fastening nut protection cap
13.The pre-buried round steel pipe 8 of cushion cap is similar with the pre-buried round steel pipe 7 of bent cap, and diameter is 10mm bigger than fining twisted steel diameter.Rubber stopper 9
The pre-buried round steel pipe of cushion cap 8 is protected after being completed for the construction of cushion cap 6, prevents sundries from entering.10 He of spiral busting reinforcement
The effect of cushion cap Pressure-bearing pads 11 is that concrete ruptures during stress in order to prevent.Fastening nut 12 is welded on cushion cap and holds
On pressure pad plate 11, fining twisted steel is screwed in into 12 suitable length of fastening nut when needing to install fining twisted steel.Fastening
Nut protection cap 13 is also welded on cushion cap Pressure-bearing pads 11, is protected to fastening nut 12, is prevented in 6 casting process of cushion cap
Concrete enters destruction screw thread.
Fig. 4 shows the connection between fining twisted steel, and screw-thread steel is arranged using modularization, passes through adjustment criteria section finish rolling
The combination of 19 different length of screw-thread steel can satisfy the bent cap demand of different height.The fining twisted steel at 3 end of large span bent cap makes
3 top of large span bent cap is fixed on screw thread billet 14, screw thread steel washer 15, screw-thread steel nut 17.Standard knot finish rolling screw thread
It is attached between steel 19 by rebar sleeve 18.To the fining twisted steel installed using hydraulic jack tensioning to setting
Evaluation makes screw-thread steel and the preparatory stress of dependent Concrete structure.
Fig. 5 is the schematic diagram that the prior art carries out same operating condition construction using temporary rest pier 20.It can be seen from the figure that making
Need to set up the huge temporary rest pier of the scale of construction with temporary rest pier, it is time-consuming and laborious.And use the interim stretch-draw anchor of this great cantilever bent cap
Suspension device 5 only needs the simple pre-buried and screw-thread steel installation of progress that can achieve the goal, and saves a large amount of manpower and material resources and duration.
Suitable position of the present invention in bridge formation owner's supporting leg supporting point pier stud opposite side holds bent cap, keeps large span bent cap symmetrical
Stress guarantees structure stress safety to eliminate the moment of flexure to pier stud.It is only needed on bent cap and cushion cap using fining twisted steel
It is appropriate reserved and pre-buried to carry out, and reaches that need the long bent cap constructed be installation fining twisted steel in Bridge Erector, according to design value into
Row tensioning, specific as follows:
1, screw-thread steel designs
Use diameter for the screw-thread steel (UTS=1030Mpa) of 32mm totally 16 pulling bent caps, elasticity modulus 170*
103N/mm2, screw-thread steel overall length are 25m, and every screw-thread steel force value of pre- tensioning is 210kN.
1.1 calculate screw thread hardness of steel
In erection process, since bent cap is by eccentric load, increase pulling force suffered by interim screw-thread steel, in peak load feelings
Under condition, screw-thread steel Strength co-mputation process is as follows in erection process:
Screw-thread steel prestressing force
F1=210*0.9=189kN (loss of tension for considering 10%)
Since bent cap offset causes screw-thread steel to extend 29mm, increased pulling force are as follows:
Screw-thread steel institute stress are as follows:
F=F1+F2=347kN < 0.75UTS=620kN
Therefore intensity is met the requirements.
1.2 cushion cap shear calculations
Pre-buried back plate sizes are 180mm*180mm*40mm, bury and are upgraded to 750mm, then screw-thread steel shear stress suffered by cushion cap are as follows:
Therefore cushion cap shearing resistance is met the requirements.
It is analyzed by above-mentioned calculating, the mode that bent cap mode replaces temporary rest pier to prop up bent cap is held using interim screw-thread steel
Feasible, installation is simple, and material therefor is few, only need on bent cap and cushion cap preformed hole and nut, then pass through spiral shell
Line steel anchors bent cap and cushion cap, and not only effect is high, but also cost is low compared with temporary rest pier is used, the operating condition especially in high pier stud
Under, advantage is particularly evident.This method is applicable not only to overhang bent cap herein, is having eccentric load to need to prop up using buttress
In the case of, the mode of " changing support to draw " is used, plays unexpected effect sometimes.
The present invention also provides a kind of construction methods of the interim stretch-draw anchor suspension device of great cantilever bent cap, including walk as follows
It is rapid:
Step 1: the pre-buried round steel pipe 7 of bent cap is formed in the pre-buried round steel pipe of design position when large span bent cap 3 is poured,
Cushion cap 6 corresponds to the bent cap pre-buried pre-buried round steel pipe in 7 position of round steel pipe when pouring, Pressure-bearing pads, it is pre-buried that screw-thread steel nut forms cushion cap
Round steel pipe 8；
Step 2: multiple standard knot fining twisted steels 19 are in turn connected to form screw thread steel column, the upper end of screw thread steel column is passed through
The pre-buried round steel pipe 7 of bent cap, end successively use screw thread billet 14, screw thread steel washer 15, screw-thread steel nut 17 fixed, screw-thread steel
It is fixed that the lower end of column screws in the pre-buried round steel pipe 8 of cushion cap.
Wherein, fastening nut 12 is welded on cushion cap Pressure-bearing pads 11, the lower end of screw thread steel column passes through the pre-buried circle of cushion cap
Fastening nut 12 is screwed in after steel pipe 8.
The demounting procedure of above-mentioned apparatus are as follows: the screw-thread steel spiral shell after Bridge Erector is constructed, first on disassembly large span bent cap 3
Then mother 17 successively dismantles standard knot fining twisted steel 19 from top to down, and screws out the screw-thread steel on cushion cap 6, finally use nothing
The hole of shrinkage grouting filler closure cushion cap 6 and large span bent cap 3.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (3)
1. a kind of interim stretch-draw anchor suspension device of great cantilever bent cap, it is characterised in that: including being set on large span bent cap (3)
The pre-buried round steel pipe of bent cap (7), be set to cushion cap (6) on the pre-buried round steel pipe of cushion cap (8) and by rebar sleeve (18) connect
Multiple standard knot fining twisted steels (19), the pre-buried round steel pipe of bent cap (7) is corresponding with cushion cap pre-buried round steel pipe (8) upper and lower position to be set
It sets, multiple standard knot fining twisted steels (19) are in turn connected to form screw thread steel column, and the upper end of screw thread steel column passes through the pre-buried circle of bent cap
Steel pipe (7), end successively use screw thread billet (14), screw thread steel washer (15), screw-thread steel nut (17) fixed, screw thread steel column
To screw in the pre-buried round steel pipe of cushion cap (8) fixed for lower end；The lower loop of the pre-buried round steel pipe of cushion cap (8) is arranged with spiral busting reinforcement
(10), the bottom of spiral busting reinforcement (10) is equipped with cushion cap Pressure-bearing pads (11), spiral busting reinforcement (10) and cushion cap pressure-bearing pad
Plate (11) is for preventing concrete from rupturing during stress；Fastening nut (12) are welded on cushion cap Pressure-bearing pads (11),
The lower end of screw thread steel column passes through the pre-buried round steel pipe of cushion cap (8) and screws in fastening nut (12) afterwards.
2. the interim stretch-draw anchor suspension device of great cantilever bent cap as described in claim 1, it is characterised in that: cushion cap Pressure-bearing pads
(11) it is also welded with the fastening nut protection cap (13) protected to fastening nut (12), fastening nut protection cap (13) is located at
Fastening nut (12) lower part.
3. a kind of construction method of the interim stretch-draw anchor suspension device of great cantilever bent cap, it is characterised in that include the following steps:
Step 1: the pre-buried round steel pipe of bent cap (7) are formed in the pre-buried round steel pipe of design position when large span bent cap (3) is poured,
Cushion cap (6) corresponds to the pre-buried round steel pipe in the pre-buried round steel pipe of bent cap (7) position, Pressure-bearing pads when pouring, screw-thread steel nut forms cushion cap
Pre-buried round steel pipe (8), the lower loop of the pre-buried round steel pipe of cushion cap (8) are arranged with spiral busting reinforcement (10), spiral busting reinforcement
(10) bottom is equipped with cushion cap Pressure-bearing pads (11)；
Step 2: multiple standard knot fining twisted steels (19) are in turn connected to form screw thread steel column, the upper end of screw thread steel column passes through lid
The pre-buried round steel pipe of beam (7), end successively use screw thread billet (14), screw thread steel washer (15), screw-thread steel nut (17) fixed,
It is fixed that the lower end of screw thread steel column screws in the pre-buried round steel pipe of cushion cap (8)；
It is welded on cushion cap Pressure-bearing pads (11) fastening nut (12), the lower end of screw thread steel column passes through the pre-buried round steel pipe of cushion cap
(8) fastening nut (12) are screwed in afterwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610900956.6A CN106436583B (en) | 2016-10-14 | 2016-10-14 | A kind of interim stretch-draw anchor suspension device of great cantilever bent cap and its construction method |
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| CN201610900956.6A CN106436583B (en) | 2016-10-14 | 2016-10-14 | A kind of interim stretch-draw anchor suspension device of great cantilever bent cap and its construction method |
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| CN106436583B true CN106436583B (en) | 2019-02-19 |
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| CN109468946B (en) * | 2018-04-12 | 2024-04-12 | 上海公路投资建设发展有限公司 | Steel structure temporary fixing device and process for large-scale bent cap cantilever assembly |
| CN110541364A (en) * | 2019-09-04 | 2019-12-06 | 上海城建市政工程（集团）有限公司 | Bridge bent cap segmented prefabrication, assembly and fixation method |
| CN110685222A (en) * | 2019-09-04 | 2020-01-14 | 上海城建市政工程（集团）有限公司 | Balance construction method for prefabricated bent cap support-free pull rod |
| CN111042006B (en) * | 2020-01-16 | 2022-04-15 | 中建七局安装工程有限公司 | High pier edge span suspension casting beam Bailey truss structure and construction method thereof |
| CN111501527A (en) * | 2020-03-31 | 2020-08-07 | 上海城建市政工程（集团）有限公司 | Temporary fixing method for prestressed concrete bent cap with small column spacing and large cantilever |
| CN111809505A (en) * | 2020-06-19 | 2020-10-23 | 中铁大桥局上海工程有限公司 | Anchor pulling component and eccentric beam |
| CN112627060A (en) * | 2020-12-30 | 2021-04-09 | 中国建筑土木建设有限公司 | Side-span cast-in-place section cantilever bearing system and construction method thereof |
| CN113652966B (en) * | 2021-07-13 | 2022-11-25 | 宁波市政工程建设集团股份有限公司 | Construction method of full-prefabricated assembly type concrete beam type bridge structure system |
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