CN110374014A - Big span continuous beam UHPC column construction method - Google Patents
Big span continuous beam UHPC column construction method Download PDFInfo
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- CN110374014A CN110374014A CN201910733636.XA CN201910733636A CN110374014A CN 110374014 A CN110374014 A CN 110374014A CN 201910733636 A CN201910733636 A CN 201910733636A CN 110374014 A CN110374014 A CN 110374014A
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- uhpc
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- uhpc column
- concrete
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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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- 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
- E01D21/10—Cantilevered erection
- E01D21/105—Balanced cantilevered erection
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a kind of big span continuous beam UHPC column construction methods, step is that 1. 2. 0 number section UHPC column segment is installed in prefabricated U HPC column segment on main pier bracket, pour normal concrete, stretch-draw prestressing force beam, 3. assembled Hanging Basket installs 1 number section UHPC column segment on hanging basket formwork, 1 number section UHPC column segment is positioned by the U-shaped fixing steel plate of 0 number section UHPC column segment, and the opposite cast-in-place connector face structure of the two and U-shaped fixing steel plate constitute diamond shape casting chamber and are 4. poured intracavitary cast-in-place RPC to diamond shape, 1 number section normal concrete is poured again, stretch-draw prestressing force beam, and it is mobile, assembled Hanging Basket remaining design of 5. constructing has the concrete segment of UHPC column 6. to construct other common prestressed concrete segments and closure segment, complete construction.Structure of the invention is ingenious, easy to operate, convenient to carry out, reduces secondary formwork erection interference, ensure that UHPC prefabricated post pours effective combination of connector with after, solves the problems, such as that structure across prestressed concrete continuous beam greatly deforms sustainable growth due to shrinkage and creep bring.
Description
Technical field
The present invention relates to bridge construction technology fields, more particularly, to a kind of big span continuous beam UHPC column construction method.
Background technique
Big shrinkage and creep of the span continuous beam (continuous rigid frame) during operation due to concrete brings mid-span deflection to continue
Increase as the common problem in science of bridge building.UHPC (Ultra-High Performance Concrete) is a kind of superelevation
Can concrete material, with superelevation compression strength, flexural strength, toughness, compared to normal concrete, in UHPC process for preparation
It joined reactive powder, the feature that shrinkage is extremely low, Creep Coefficient is small showed after thermal curing.Based on the feature, research
Personnel, which imagine, is arranged UHPC column in continuous beam pressurized zone, to solve structure across prestressed concrete continuous beam greatly due to shrinking
Bring of creeping deforms the problem of sustainable growth.However, how designing bridge structure, simplifying construction procedure, reduce construction cost
It is applied to problem urgently to be resolved in the construction of big span continuous beam as UHPC.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of big span continuous beam UHPC column construction method, can take following skill
Art scheme:
Big span continuous beam UHPC column construction method of the present invention, includes the following steps:
The first step, prefabricated U HPC column segment are provided with longitudinal reinforcement, the both ends setting of UHPC column segment in UHPC column segment
There is cast-in-place connector face structure, and wherein one end of UHPC column segment is coated with the positioning of the U-shaped for connecting adjacent UHPC column segment
Steel plate, the bottom plate of the U-shaped fixing steel plate, left plate are welded with WELDING STUDS inside and outside right side plate；
Second step sets up bracket by main pier, installs 0 number section UHPC column segment at bottom in template later, then pour 0
Number section normal concrete, after concrete strength reaches design requirement, 0 number section prestressing tendon of tensioning, and assembled symmetrical cantilever is applied
Work Hanging Basket；
Third step, installs 1 number section UHPC column segment on hanging basket formwork, and 1 number section UHPC column segment passes through 0 number section UHPC column segment
U-shaped fixing steel plate positioned, and the opposite cast-in-place connector face structure of the two and U-shaped fixing steel plate constitute diamond shape and are poured chamber；
4th step is poured intracavitary cast-in-place RPC to the diamond shape of third step, then pours 1 number section normal concrete, reaches to concrete strength
To after design requirement, 1 number section prestressing tendon of tensioning, and mobile, assembled symmetrical cantilever construction Hanging Basket；
5th step, according to Step 3: four method, successively remaining design is completed in construction the concrete segment of UHPC column；
6th step is successively constructed other common prestressed concrete segments and closure segment according to conventional construction method, completes bridge
Construction.
The total length that design described in every span centre has the concrete segment of UHPC column is the 1/4-1/5 of main span across footpath.
The design, which has the concrete segment of UHPC column to be arranged side by side along bridge wide direction, 1-10 root UHPC column segment.
The advantage of the invention is that it is clever structure, easy to operate, convenient to carry out, secondary formwork erection interference can be effectively reduced,
Guarantee that UHPC prefabricated post pours effective combination of connector with after, is able to solve structure across prestressed concrete continuous beam greatly due to shrinking
Bring of creeping deforms the problem of sustainable growth, provides technical support for the construction of big span continuous beam of UHPC column is arranged.
Detailed description of the invention
Fig. 1-7 is construction procedure schematic diagram of the invention.
Fig. 8 is the portion A enlarged drawing in Fig. 2.
Fig. 9 is the I-I sectional view of Fig. 8.
Specific embodiment
Big span continuous beam UHPC column construction method of the present invention is illustrated with specific embodiment below.
As shown in figs. 1-7, above-mentioned construction method includes the following steps:
The first step, prefabricated U HPC column segment 1 are provided with longitudinal reinforcement 1.1 in each UHPC column segment 1 as shown in Figure 8,9,
The both ends of UHPC column segment 1 are provided with the cast-in-place connector face structure 1.2 of middle part indent, and wherein one end packet of UHPC column segment 1
It is covered with the U-shaped fixing steel plate 1.3 for connecting adjacent UHPC column segment, bottom plate, left plate, the right side plate of U-shaped fixing steel plate 1.3
Inside and outside be welded with WELDING STUDS 1.4；
Second step sets up bracket by main pier, and carries out precompressed to bracket, installs 0 number section at bottom in template later
UHPC column segment, then 0 number section normal concrete is poured, after concrete strength reaches design strength 90%, 0 number section of tensioning is answered in advance
Power beam, and the assembled symmetrical cantilever construction Hanging Basket 2 in 0 number section；Generally, according to design scheme, UHPC column segment is wide along bridge
Direction, which is arranged side by side, 1-10 root.
Third step, installs 1 number section UHPC column segment on hanging basket formwork, and 1 number section passes through the U-shaped of 0 number section UHPC column segment
Fixing steel plate 1.3 is positioned, and the cast-in-place connector face structure 1.2 and the composition diamond shape casting of U-shaped fixing steel plate 1.3 that the two is opposite
Chamber 1.5(is shown in Fig. 8)；
4th step, the cast-in-place RPC (Reactive Powder Concrete) into the diamond shape of third step casting chamber 1.5, makes two UHPC column segments
It connects integral, then pours 1 number section normal concrete again, after concrete strength reaches design strength 90%, 1 number section of tensioning
Prestressing tendon, and mobile, assembled symmetrical cantilever construction Hanging Basket 2；
5th step, according to Step 3: four method, successively remaining design is completed in construction the concrete segment of UHPC column；Generally
Ground, in bridge often across design have UHPC column concrete segment total length be bridge main span across footpath 1/4-1/5, the present embodiment
The middle concrete segment for having UHPC column that designs is 0-8 number section.
6th step is successively constructed other common prestressed concrete segments and closure segment according to conventional construction method, is completed
Bridge construction.
Specifically, for common prestressed concrete segment, it is first poured normal concrete, when concrete strength reaches design
After intensity 90%, then the tensioning segment prestressing tendon moves, assembled symmetrical cantilever construction Hanging Basket 2, repeats aforesaid operations, according to
Secondary all common prestressed concrete segments of construction.
When carrying out closure segment construction, abutment pier collateral branch frame, and the pouring construction end bay beam section on bracket are first set up, then basis
Sequence, closure segment of successively constructing are closed up in design.
Finally, striking, construction bridge deck, traffic engineering and other affiliated facilities, complete bridge construction.
Using the big span continuous beam constructed of the present invention, compared with common big span continuous beam, 10 years shrinkage and creeps it is caused across
Middle vertical displacement reduces about 40%-50%, and hogging moment area structure corner reduces about 40%, can sufficiently avoid structure due to shrinking Xu
The problem of becoming bring deformation sustainable growth, effectively improves service life greatly across prestressed concrete continuous beam.
Claims (3)
1. a kind of big span continuous beam UHPC column construction method, characterized by the following steps:
The first step, prefabricated U HPC column segment are provided with longitudinal reinforcement, the both ends setting of UHPC column segment in UHPC column segment
There is cast-in-place connector face structure, and wherein one end of UHPC column segment is coated with the positioning of the U-shaped for connecting adjacent UHPC column segment
Steel plate, the bottom plate of the U-shaped fixing steel plate, left plate are welded with WELDING STUDS inside and outside right side plate；
Second step sets up bracket by main pier, installs 0 number section UHPC column segment at bottom in template later, then pour 0
Number section normal concrete, after concrete strength reaches design requirement, 0 number section prestressing tendon of tensioning, and assembled symmetrical cantilever is applied
Work Hanging Basket；
Third step, installs 1 number section UHPC column segment on hanging basket formwork, and 1 number section UHPC column segment passes through 0 number section UHPC column segment
U-shaped fixing steel plate positioned, and the opposite cast-in-place connector face structure of the two and U-shaped fixing steel plate constitute diamond shape and are poured chamber；
4th step is poured intracavitary cast-in-place RPC to the diamond shape of third step, then pours 1 number section normal concrete, reaches to concrete strength
To after design requirement, 1 number section prestressing tendon of tensioning, and mobile, assembled symmetrical cantilever construction Hanging Basket；
5th step, according to Step 3: four method, successively remaining design is completed in construction the concrete segment of UHPC column；
6th step is successively constructed other common prestressed concrete segments and closure segment according to conventional construction method, completes bridge
Construction.
2. big span continuous beam UHPC column construction method according to claim 1, it is characterised in that: design described in every span centre has
The total length of the concrete segment of UHPC column is the 1/4-1/5 of main span across footpath.
3. big span continuous beam UHPC column construction method according to claim 1, it is characterised in that: the design has UHPC column
Concrete segment along bridge wide direction be arranged side by side have 1-10 root UHPC column segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733636.XA CN110374014B (en) | 2019-08-09 | 2019-08-09 | Construction method of long-span continuous beam UHPC column |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733636.XA CN110374014B (en) | 2019-08-09 | 2019-08-09 | Construction method of long-span continuous beam UHPC column |
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| CN110374014A true CN110374014A (en) | 2019-10-25 |
| CN110374014B CN110374014B (en) | 2021-06-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111119071A (en) * | 2020-01-16 | 2020-05-08 | 中建七局安装工程有限公司 | Construction method for assembling precast concrete segment box girder |
| CN112081017A (en) * | 2020-08-20 | 2020-12-15 | 河南五建建设集团有限公司 | Construction method for assembling prefabricated cantilever on long-span segment of bridge to span existing bridge |
| CN112523061A (en) * | 2020-11-24 | 2021-03-19 | 广西交通设计集团有限公司 | UHPC stiffened prestressed concrete box girder bridge structure and construction process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111119071A (en) * | 2020-01-16 | 2020-05-08 | 中建七局安装工程有限公司 | Construction method for assembling precast concrete segment box girder |
| CN112081017A (en) * | 2020-08-20 | 2020-12-15 | 河南五建建设集团有限公司 | Construction method for assembling prefabricated cantilever on long-span segment of bridge to span existing bridge |
| CN112523061A (en) * | 2020-11-24 | 2021-03-19 | 广西交通设计集团有限公司 | UHPC stiffened prestressed concrete box girder bridge structure and construction process thereof |
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| CN110374014B (en) | 2021-06-25 |
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