CN114575232A - Large-cantilever semi-fabricated prestressed concrete bent cap and construction process thereof - Google Patents
Large-cantilever semi-fabricated prestressed concrete bent cap and construction process thereof Download PDFInfo
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- CN114575232A CN114575232A CN202210388285.5A CN202210388285A CN114575232A CN 114575232 A CN114575232 A CN 114575232A CN 202210388285 A CN202210388285 A CN 202210388285A CN 114575232 A CN114575232 A CN 114575232A
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 89
- 239000010959 steel Substances 0.000 claims abstract description 89
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 86
- 239000004567 concrete Substances 0.000 claims abstract description 28
- 210000002435 tendon Anatomy 0.000 claims abstract description 25
- 230000002787 reinforcement Effects 0.000 description 7
- 239000011178 precast concrete Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- E01D1/00—Bridges in general
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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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A large-cantilever semi-fabricated prestressed concrete bent cap and a construction process thereof are disclosed, wherein the bent cap comprises a UHPC shell, a support, a pier stud and a steel bar framework, the UHPC shell is arranged at the top of the pier stud through the support, the UHPC shell and the support are of an integrated structure, a plurality of embedded sleeves are vertically arranged on the support, a plurality of embedded steel bars are vertically arranged at the top of the pier stud, and the embedded steel bars penetrate through the embedded sleeves and extend into the UHPC shell; the steel bar framework is fixedly arranged in the UHPC shell; ordinary concrete is poured inside the UHPC shell; a prestressed tendon/cable is also arranged inside the UHPC shell; the inner surface of the UHPC shell is provided with vertical ribs and horizontal ribs; channel steel is arranged at the top of the vertical rib; and steel plate braces are arranged between the channel steels. The construction process comprises the following steps: hoisting the prefabricated UHPC shell to the top of the pier stud; hoisting the steel bar framework into the UHPC shell and fixing; laying prestressed tendons/cables; mounting channel steel; pouring common concrete; and after the common concrete reaches the design strength, tensioning the prestressed tendons/cables and fixing the prestressed tendons/cables on the UHPC shell.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a large-cantilever semi-fabricated prestressed concrete bent cap and a construction process thereof.
Background
At present, with the rapid development of the traffic basic engineering technology in China, the overall construction level of bridge engineering is greatly improved, in mainstream bridge construction, particularly the construction of a bent cap, a construction mode of pouring concrete on site is mainly adopted, and under some special conditions, a construction mode of adopting an integral precast concrete bent cap and adopting hoisting in place is also adopted.
However, for the construction method of pouring concrete on site, the procedures of building a temporary supporting structure, installing a formwork, binding a steel reinforcement framework and pouring concrete need to be performed, and in the execution process of the procedures, the traffic of roads under the bridge is seriously affected, and even the traffic of roads under the bridge needs to be interrupted. In addition, the construction mode of pouring concrete on site also has the defects of complex construction procedures, long construction period, large occupied area for construction, high construction risk and the like, and the support and the bent cap template erected on site are easy to have defects and can also have adverse effects on the quality of the bent cap.
For the construction mode of hoisting the integral precast concrete bent cap in place, although the influence of construction on traffic under a bridge is reduced compared with the construction mode of pouring concrete on site, the bent cap has heavy weight and can cause great difficulty in transportation and hoisting of the bent cap. In addition, the construction method is limited by a manufacturing site, a hoisting tool, a hoisting space, transportation facilities and other factors.
The precast concrete assembly type construction process has become an important development direction of the engineering construction in China, the precast assembly technology of the bridge superstructure, the bridge pier, the pile foundation and other components has tended to be mature, but the difficult problem of the assembly of the large-tonnage capping beam has not been solved well all the time, especially the large cantilever capping beam has dead weight of 200 t-600 t, is very difficult to transport and hoist, and is more difficult to construct by adopting the assembly type.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a large-cantilever semi-fabricated prestressed concrete bent cap and a construction process thereof, wherein the bent cap comprises a thin-wall shell made of UHPC (ultra high performance concrete), the UHPC shell is required to be hoisted to a concrete pier stud in advance, then a steel bar framework is arranged in the UHPC shell, then prestressed steel bars/cables are laid, finally common concrete is poured into the UHPC shell, and after the common concrete reaches the design strength, the prestressed steel bars/cables are tensioned, so that the large-cantilever semi-fabricated prestressed concrete bent cap can be formed. Meanwhile, in order to improve the longitudinal rigidity of the UHPC shell, two channel steel are longitudinally arranged on the inner side of the shell, and in order to prevent the lateral deformation of the interior of the UHPC shell when ordinary concrete is poured from being overlarge, steel plate braces are transversely arranged on the inner side of the shell. Compared with the traditional construction process, the construction process does not need to erect temporary supports and templates, effectively simplifies the construction process, shortens the construction time, reduces pollution and noise, and can minimize the influence of construction on the road traffic under the bridge.
In order to achieve the purpose, the invention adopts the following technical scheme: a large cantilever semi-assembly type prestressed concrete bent cap comprises a UHPC shell, a support, a pier stud and a steel reinforcement framework; the UHPC shell is arranged at the top of the pier column through a support; the UHPC shell and the support adopt an integrated structure, and a plurality of embedded sleeves are vertically arranged on the support; a plurality of embedded steel bars are vertically arranged at the top of the pier stud, the number of the embedded steel bars is the same as that of the embedded sleeves, the embedded steel bars correspond to the embedded sleeves one by one, and the embedded steel bars penetrate through the embedded sleeves and extend into the UHPC shell; the steel bar framework is fixedly arranged inside the UHPC shell, and ordinary concrete is poured inside the UHPC shell provided with the steel bar framework.
A prestressed tendon/cable is also arranged in the UHPC shell; the prestressed tendons/cables are distributed along the longitudinal direction of the bent cap, and two ends of each prestressed tendon/cable are fixedly connected with the UHPC shell sequentially through the backing plate and the anchorage device.
And a plurality of vertical ribs are uniformly distributed on the inner surface of the UHPC shell along the transverse direction of the bent cap, and the vertical ribs and the UHPC shell adopt an integrated structure.
Horizontal ribs are further arranged on the inner surface of the UHPC shell between the vertical ribs, and the horizontal ribs and the UHPC shell are of an integrated structure.
And channel steel is longitudinally arranged at the top of each vertical rib along the bent cap, the notch of each channel steel faces upwards, and the channel steel and the vertical rib and the channel steel and the UHPC shell are fixedly connected through embedded bolts.
A plurality of steel plate braces are arranged between longitudinal channel steel of the bent cap, the steel plate braces are evenly distributed along the transverse direction of the bent cap, and the steel plate braces are fixedly connected with the channel steel through high-strength bolts.
The construction process of the large cantilever semi-fabricated prestressed concrete bent cap comprises the following steps:
the method comprises the following steps: hoisting the prefabricated UHPC shell to the top of the pier stud to ensure that the embedded steel bars at the top of the pier stud accurately penetrate into the embedded sleeve of the support;
step two: fixedly connecting the channel steel with the UHPC shell and the vertical ribs together through embedded bolts;
step three: hoisting the steel bar framework into the UHPC shell and fixing;
step four: laying a prestressed tendon/cable in the UHPC shell, wherein two ends of the laid prestressed tendon/cable need to penetrate out of the UHPC shell;
step five: fixedly connecting the steel plate brace with the channel steel through a high-strength bolt;
step six: pouring common concrete into the UHPC shell;
step seven: and after the common concrete reaches the designed strength, tensioning the prestressed tendons/cables, and finally fixing the prestressed tendons/cables on the UHPC shell through the backing plate and the anchorage device.
The invention has the beneficial effects that:
the invention relates to a large cantilever semi-fabricated prestressed Concrete bent cap and a construction process thereof, wherein the bent cap comprises a thin-wall shell made of UHPC (Ultra-High Performance Concrete), the UHPC shell is required to be hoisted to a Concrete pier stud in advance, then a steel reinforcement framework is arranged in the UHPC shell, then prestressed steel reinforcements/cables are laid, finally common Concrete is poured in the UHPC shell, and the tensioning of the prestressed steel reinforcements/cables is completed after the common Concrete reaches the design strength, so that the large cantilever semi-fabricated prestressed Concrete bent cap can be formed. Meanwhile, in order to improve the longitudinal rigidity of the UHPC shell, two channel steel are longitudinally arranged on the inner side of the shell, and in order to prevent the lateral deformation of the interior of the UHPC shell when ordinary concrete is poured from being overlarge, steel plate braces are transversely arranged on the inner side of the shell. Compared with the traditional construction process, the construction process does not need to erect temporary supports and templates, effectively simplifies the construction process, shortens the construction time, reduces pollution and noise, and can minimize the influence of construction on the road traffic under the bridge.
Drawings
FIG. 1 is a front view of a large cantilever semi-fabricated prestressed concrete cap beam according to the present invention;
FIG. 2 is a top view of a large cantilever semi-fabricated prestressed concrete capping beam (the steel framework and the general concrete are not shown) of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;
fig. 5 is a cross-sectional view B-B of fig. 3 (the steel reinforcement cage and the general concrete are shown);
FIG. 6 is an enlarged view of portion I of FIG. 2;
FIG. 7 is an enlarged view of section II of FIG. 3;
FIG. 8 is an enlarged view of section III of FIG. 4;
in the figure, 1-UHPC shell, 2-support, 3-pier stud, 4-steel bar skeleton, 5-embedded casing, 6-embedded steel bar, 7-common concrete, 8-prestressed bar/cable, 9-backing plate, 10-anchorage device, 11-vertical rib, 12-horizontal rib, 13-channel steel, 14-embedded bolt, 15-steel plate brace and 16-high-strength bolt.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 8, a large cantilever semi-fabricated prestressed concrete bent cap comprises a UHPC shell 1, a support 2, a pier stud 3 and a steel reinforcement framework 4; the UHPC shell 1 is arranged on the top of the pier stud 3 through a support 2; the UHPC shell 1 and the support 2 adopt an integrated structure, and a plurality of pre-buried sleeves 5 are vertically arranged on the support 2; a plurality of embedded steel bars 6 are vertically arranged at the top of the pier stud 3, the number of the embedded steel bars 6 is the same as that of the embedded sleeves 5, the embedded steel bars 6 correspond to the embedded sleeves 5 in a one-to-one mode, and the embedded steel bars 6 penetrate through the embedded sleeves 5 and extend into the UHPC shell 1; the steel bar framework 4 is fixedly arranged inside the UHPC shell 1, and the common concrete 7 is poured inside the UHPC shell 1 provided with the steel bar framework 4.
A prestressed tendon/cable 8 is also arranged in the UHPC shell 1; the prestressed tendons/cables 8 are distributed along the longitudinal direction of the bent cap, and two ends of each prestressed tendon/cable 8 are fixedly connected with the UHPC shell 1 sequentially through a backing plate 9 and an anchorage device 10.
A plurality of vertical ribs 11 are uniformly distributed on the inner surface of the UHPC shell 1 along the transverse direction of the bent cap, and the vertical ribs 11 and the UHPC shell 1 adopt an integrated structure.
And channel steel 13 is longitudinally arranged at the top of the vertical rib 11 along the bent cap, the notch of the channel steel 13 faces upwards, and the channel steel 13 and the vertical rib 11, and the channel steel 13 and the UHPC shell 1 are fixedly connected through embedded bolts 14.
A plurality of steel plate braces 15 are arranged between longitudinal channel steel 13 of the bent cap, the steel plate braces 15 are evenly distributed along the transverse direction of the bent cap, and the steel plate braces 15 are fixedly connected with the channel steel 13 through high-strength bolts 16.
The construction process of the large cantilever semi-fabricated prestressed concrete bent cap comprises the following steps:
the method comprises the following steps: hoisting the prefabricated UHPC shell 1 to the top of the pier stud 3, and enabling the embedded steel bars 6 at the top of the pier stud 3 to accurately penetrate into the embedded sleeve 5 of the support 2;
step two: fixedly connecting channel steel 13 with the UHPC shell 1 and the vertical ribs 11 together through embedded bolts 14;
step three: hoisting the steel bar framework 4 into the UHPC shell 1 and fixing;
step four: arranging a prestressed tendon/cable 8 in the UHPC shell 1, wherein two ends of the arranged prestressed tendon/cable 8 need to penetrate out of the UHPC shell 1;
step five: fixedly connecting a steel plate brace 15 with the channel steel 13 through a high-strength bolt 16;
step six: pouring the common concrete 7 into the UHPC shell 1;
step seven: after the common concrete 7 reaches the design strength, the prestressed tendons/cables 8 are tensioned, and finally the prestressed tendons/cables 8 are fixed on the UHPC shell 1 through the backing plate 9 and the anchorage device 10.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. The utility model provides a half assembled prestressed concrete bent cap encorbelments greatly which characterized in that: comprises a UHPC shell, a support, pier studs and a steel bar framework; the UHPC shell is arranged at the top of the pier column through a support; the UHPC shell and the support adopt an integrated structure, and a plurality of embedded sleeves are vertically arranged on the support; a plurality of embedded steel bars are vertically arranged at the top of the pier stud, the number of the embedded steel bars is the same as that of the embedded sleeves, the embedded steel bars correspond to the embedded sleeves one by one, and the embedded steel bars penetrate through the embedded sleeves and extend into the UHPC shell; the steel bar framework is fixedly arranged inside the UHPC shell, and common concrete is poured inside the UHPC shell provided with the steel bar framework.
2. The large cantilever semi-fabricated prestressed concrete capping beam according to claim 1, characterized in that: a prestressed tendon/cable is also arranged in the UHPC shell; the prestressed tendons/cables are distributed along the longitudinal direction of the bent cap, and two ends of each prestressed tendon/cable are fixedly connected with the UHPC shell sequentially through the backing plate and the anchorage device.
3. The large cantilever semi-fabricated prestressed concrete capping beam according to claim 1, characterized in that: and a plurality of vertical ribs are uniformly distributed on the inner surface of the UHPC shell along the transverse direction of the bent cap, and the vertical ribs and the UHPC shell adopt an integrated structure.
4. The large cantilever semi-fabricated prestressed concrete cap beam according to claim 3, characterized in that: horizontal ribs are further arranged on the inner surface of the UHPC shell between the vertical ribs, and the horizontal ribs and the UHPC shell are of an integrated structure.
5. The large cantilever semi-fabricated prestressed concrete capping beam according to claim 3, characterized in that: and channel steel is longitudinally arranged at the top of each vertical rib along the bent cap, the notch of each channel steel faces upwards, and the channel steel and the vertical rib and the channel steel and the UHPC shell are fixedly connected through embedded bolts.
6. The large cantilever semi-fabricated prestressed concrete capping beam according to claim 5, characterized in that: a plurality of steel plate braces are arranged between longitudinal channel steel of the bent cap, the steel plate braces are evenly distributed along the transverse direction of the bent cap, and the steel plate braces are fixedly connected with the channel steel through high-strength bolts.
7. The construction process of the large cantilever semi-fabricated prestressed concrete capping beam as claimed in claim 1, characterized by comprising the steps of:
the method comprises the following steps: hoisting the prefabricated UHPC shell to the top of the pier stud to ensure that the embedded steel bars at the top of the pier stud accurately penetrate into the embedded sleeve of the support;
step two: fixedly connecting the channel steel with the UHPC shell and the vertical ribs through embedded bolts;
step three: hoisting the steel bar framework into the UHPC shell and fixing;
step four: laying prestressed tendons/cables in the UHPC shell, wherein two ends of the laid prestressed tendons/cables need to penetrate out of the UHPC shell;
step five: fixedly connecting the steel plate brace with the channel steel through a high-strength bolt;
step six: pouring common concrete into the UHPC shell;
step seven: after the common concrete reaches the design strength, the prestressed tendons/cables are tensioned, and finally the prestressed tendons/cables are fixed on the UHPC shell through the backing plate and the anchorage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210388285.5A CN114575232A (en) | 2022-04-14 | 2022-04-14 | Large-cantilever semi-fabricated prestressed concrete bent cap and construction process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210388285.5A CN114575232A (en) | 2022-04-14 | 2022-04-14 | Large-cantilever semi-fabricated prestressed concrete bent cap and construction process thereof |
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| CN114575232A true CN114575232A (en) | 2022-06-03 |
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| CN113279323A (en) * | 2021-06-24 | 2021-08-20 | 中交第一公路勘察设计研究院有限公司 | Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method |
| CN113279324A (en) * | 2021-06-24 | 2021-08-20 | 中交第一公路勘察设计研究院有限公司 | Semi-prefabricated UHPC-NC combined cover beam connecting structure and assembling method |
| CN113605246A (en) * | 2021-08-24 | 2021-11-05 | 湖南大学 | Prestressed UHPC shell-concrete inner core combined bent cap structure and construction method thereof |
| CN214939292U (en) * | 2021-01-19 | 2021-11-30 | 宁波市高等级公路建设管理中心 | Cover beam disassembly-free template |
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2022
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