CN112813836A - Cast-in-place box girder construction method - Google Patents
Cast-in-place box girder construction method Download PDFInfo
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- CN112813836A CN112813836A CN202011642916.9A CN202011642916A CN112813836A CN 112813836 A CN112813836 A CN 112813836A CN 202011642916 A CN202011642916 A CN 202011642916A CN 112813836 A CN112813836 A CN 112813836A
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- 238000010276 construction Methods 0.000 title claims abstract description 116
- 210000002435 tendon Anatomy 0.000 claims abstract description 23
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 238000009415 formwork Methods 0.000 claims abstract description 10
- 239000004576 sand Substances 0.000 claims description 108
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000007599 discharging Methods 0.000 claims description 7
- 241001426407 Umbrina coroides Species 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a cast-in-place box girder construction method, which comprises the following steps: laying a strip foundation in a construction area; a plurality of upright posts are connected and arranged on the strip-shaped foundation; assembling construction supports on the plurality of upright columns; installing construction formworks on the construction supports, enclosing the construction formworks to form a pouring space, and pouring concrete in the pouring space to form a beam body; and installing a prestressed pipeline in the poured concrete, tensioning prestressed tendons in the prestressed pipeline, inserting the end parts of the prestressed tendons to two ends of the beam body respectively, and installing the prestressed tendons in the beam body to form the cast-in-place box beam. The invention provides a cast-in-place box girder construction method, and aims to solve the problems that in the prior art, the construction method has complicated steps and the construction efficiency is low.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a cast-in-place box girder construction method.
Background
The box girder is one of the middle girders in bridge engineering, the inner part of the box girder is hollow, and flanges are arranged on two sides of the upper part of the box girder and are similar to a box, so that the box girder is named. The box girder has better bearing capacity, so the box girder can be widely used in the construction of bridges. And, the box girder of reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder. The cast-in-situ box girder has strong adaptability and is more trusted by bridge construction engineers.
However, the construction method in the conventional art has complicated steps, so that the construction efficiency is low.
Disclosure of Invention
The invention discloses a cast-in-place box girder construction method, and aims to solve the problems that in the prior art, the construction method has complicated steps and the construction efficiency is low.
In order to achieve the purpose, the invention provides a cast-in-place box girder construction method, which comprises the following steps:
laying a strip foundation in a construction area;
a plurality of upright posts are connected and arranged on the strip-shaped foundation;
assembling construction supports on the plurality of upright columns;
installing construction formworks on the construction supports, enclosing the construction formworks to form a pouring space, and pouring concrete in the pouring space to form a beam body;
installing a prestressed pipeline in the poured concrete, tensioning a prestressed tendon in the prestressed pipeline, respectively inserting the end part of the prestressed tendon to the two ends of the beam body, and installing the prestressed tendon in the beam body to form a cast-in-place box beam;
wherein the step of assembling the construction bracket on the plurality of columns comprises:
obtaining a sand cylinder;
installing the sand cylinder at the top end of the upright post;
installing an I-shaped steel beam on the sand cylinder;
a Bailey beam is arranged on the I-shaped steel cross beam; and the number of the first and second groups,
and I-shaped steel distribution beams are arranged on the Bailey beams.
Optionally, the step of obtaining a sand cylinder comprises:
arranging a sand cylinder bottom plate, and arranging a sand unloading hole on the sand cylinder bottom plate;
installing a first sand cylinder body on the sand cylinder bottom plate, and filling and leveling engineering sand in the first sand cylinder body;
a second sand cylinder body is sleeved on the first sand cylinder body, and the second sand cylinder body is movably arranged in the first sand cylinder body along the vertical direction; and the number of the first and second groups,
and a sand cylinder top plate is covered on the second sand cylinder body.
Optionally, the step of installing the sand cartridge at the top end of the column comprises:
installing a connecting steel plate at the top end of the upright post;
hoisting the sand cylinder to the top end of the upright post;
and connecting the sand cylinder bottom plate to the connecting steel plate through bolts.
Optionally, the step of installing an i-beam on the sand drum comprises:
installing a reserved steel plate on the sand cylinder top plate;
the I-shaped steel cross beam is welded on the reserved steel plate.
Optionally, the installing a prestressed pipe in the poured concrete, tensioning a prestressed tendon in the prestressed pipe, where end portions of the prestressed tendon are respectively inserted into two ends of the beam body, and the step of installing the prestressed tendon in the beam body to form a cast-in-place box beam further includes:
dismantling the construction formwork;
and removing the construction support.
Optionally, before the step of removing the construction form, the method further includes:
and opening a sand unloading hole in the sand cylinder bottom plate, and discharging the engineering sand in the first sand cylinder to descend the construction support.
Optionally, the step of removing the construction bracket further comprises:
and storing the disassembled support rod pieces in a classified manner.
Optionally, before the step of opening a sand discharge hole on the sand cylinder bottom plate, discharging the engineering sand in the first sand cylinder to drop the construction support, the method further comprises:
and a sand collecting barrel is arranged at the position of the sand unloading hole opposite to the bottom plate of the sand barrel.
Optionally, after the step of connecting and setting a plurality of columns on the strip foundation, the method further includes:
and a cross brace is arranged among the plurality of upright posts.
In the technical scheme provided by the invention, the cast-in-place box girder construction method sequentially comprises the steps of foundation construction, upright post construction, template assembly, concrete construction and prestressed tendon construction, the steps are closely connected with each other, and the rings are buckled with each other. Compared with the construction method in the prior art, the cast-in-place box girder construction method provided by the invention has the advantages that the steps are compactly connected, the construction efficiency can be effectively improved, and the economic benefit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic step diagram of a cast-in-place box girder construction method according to a first embodiment of the present invention;
FIG. 2 is a schematic step diagram of a cast-in-place box girder construction method according to a second embodiment of the present invention;
fig. 3 is a schematic step view of a cast-in-place box girder construction method according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The box girder is one of the middle girders in bridge engineering, the inner part of the box girder is hollow, and flanges are arranged on two sides of the upper part of the box girder and are similar to a box, so that the box girder is named. The box girder has better bearing capacity, so the box girder can be widely used in the construction of bridges. And, the box girder of reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder. The cast-in-situ box girder has strong adaptability and is more trusted by bridge construction engineers.
However, the construction method in the conventional art has complicated steps, so that the construction efficiency is low.
In view of the above, the invention provides a cast-in-place box girder construction method. In the attached drawings of the specification, fig. 1 is a schematic step diagram of a cast-in-place box girder construction method according to a first embodiment of the invention; FIG. 2 is a schematic step diagram of a cast-in-place box girder construction method according to a second embodiment of the present invention; fig. 3 is a schematic step view of a cast-in-place box girder construction method according to a third embodiment of the present invention.
Specifically, the construction method of the cast-in-place box girder comprises the following steps:
s100, laying a strip foundation in a construction area;
s200, connecting and arranging a plurality of stand columns on a strip-shaped foundation;
step S300, assembling construction supports on the plurality of upright posts;
s400, installing construction templates on the construction support, enclosing the construction templates to form a pouring space, and pouring concrete in the pouring space to form a beam body;
and S500, installing a prestressed pipeline in the poured concrete, tensioning a prestressed tendon in the prestressed pipeline, inserting the end part of the prestressed tendon to two ends of a beam body respectively, and installing the prestressed tendon in the beam body to form the cast-in-place box beam.
In the technical scheme provided by the invention, the cast-in-place box girder construction method sequentially comprises the steps of foundation construction, upright post construction, template assembly, concrete construction and prestressed tendon construction, the steps are closely connected with each other, and the rings are buckled with each other. Compared with the construction method in the prior art, the cast-in-place box girder construction method provided by the invention has the advantages that the steps are compactly connected, the construction efficiency can be effectively improved, and the economic benefit is improved.
Further, in order to improve the bearing capacity of the construction support and ensure the safe and stable construction of the bridge, in the technical scheme provided by the invention, the step S300 of assembling the construction support on the plurality of upright posts comprises the following steps:
step S310, obtaining a sand cylinder;
step S320, installing a sand cylinder at the top end of the upright post;
step S330, installing an I-shaped steel beam on the sand cylinder;
step S340, arranging a Bailey beam on the I-steel beam;
and S350, arranging an I-shaped steel distribution beam on the Bailey beam.
Through setting up the bailey roof beam, can be so that the construction support atress is more reasonable, and the bearing capacity is higher, more helps the construction. According to the technical scheme, the cast-in-place beam support mainly comprising the pile foundation, the strip foundation, the steel pipe column and the Bailey beam is applied to the collapsed loess region in the northern Shaanxi area, compared with the traditional cast-in-place beam, the cast-in-place beam support has the advantages that the bearing capacity of a support system is higher, the settlement of the cast-in-place beam in the collapsed loess region is reduced, and particularly the cast-in-place beam support is well applied to a 30-meter high pier.
Further, the step of obtaining the sand cylinder in step S310 includes:
step S311, arranging a sand cylinder bottom plate, and arranging a sand unloading hole on the sand cylinder bottom plate;
step S312, mounting a first sand cylinder body on a sand cylinder bottom plate, and filling leveling engineering sand in the first sand cylinder body;
s313, sleeving a second sand cylinder body on the first sand cylinder body, wherein the second sand cylinder body is movably arranged in the first sand cylinder body along the vertical direction; and the number of the first and second groups,
and step S314, covering a sand cylinder top plate on the second sand cylinder body.
It should be noted that, the sand section of thick bamboo that so sets up, height-adjustable is convenient for adjust the high flexibility of the construction template above that, and then makes subsequent construction operation more convenient.
It should be noted that the top ends of the sand cylinder and the upright post must be stable, otherwise the construction process will be affected. For this purpose, the step of installing a sand cylinder on the top end of the upright column in step S320 includes:
step S321, installing a connecting steel plate at the top end of the upright post;
step S322, hoisting the sand cylinder to the top end of the upright post;
and step S323, bolting the sand cylinder bottom plate to the connecting steel plate.
The sand cylinder bottom plate is connected with the connecting steel plate through the bolts, so that the sand cylinder can be more stably and reliably connected and installed, and the construction process is greatly benefited.
Further, the step of installing the i-beam on the sand cylinder in step S330 includes:
step S331, installing a reserved steel plate on a sand cylinder top plate;
and S332, welding the I-shaped steel beam to the reserved steel plate.
Specifically, step S500 is to install a prestressed pipe in the poured concrete, stretch a prestressed tendon in the prestressed pipe, insert end portions of the prestressed tendon to two ends of a beam body respectively, and install the prestressed tendon in the beam body, and form a cast-in-place box beam, which further includes the following steps:
s600, removing a construction template;
and S700, removing the construction support.
After the bridge construction is completed, if the construction template and the construction support are not dismantled, unnecessary influence is caused on the investment of the bridge, and therefore the construction template and the construction support can be dismantled in time. In addition, in order to facilitate recycling of the construction bracket, in the technical solution of the present invention, after the step of detaching the construction bracket in step S700, the method further includes:
and step S800, storing the disassembled support rod pieces in a classified manner.
Moreover, the sand cylinder can also help to remove the construction bracket and the construction formwork, and particularly,
step S600, before the step of removing the construction form, further includes:
and S61, opening a sand discharging hole on the sand cylinder bottom plate, and discharging the engineering sand in the first sand cylinder to drop the construction support.
The height of the construction support is reduced by removing the engineering sand in the sand cylinder, and the construction formwork is descended along with the engineering sand, so that a constructor can detach the construction support more conveniently.
Furthermore, before the step of opening the sand discharge hole on the sand cylinder bottom plate and discharging the engineering sand in the first sand cylinder to drop the construction bracket in step S60, the method further comprises:
and step S60, arranging a sand collecting barrel at the position opposite to the sand unloading hole of the sand barrel bottom plate.
In order to prevent the discharged engineering sand from polluting the environment, a special sand collecting barrel can be arranged to collect the engineering sand in real time so as to avoid the problems.
In order to improve the bearing capacity of the upright post and facilitate construction,
step S200, the step of connecting and arranging a plurality of upright posts on the strip foundation further comprises the following steps:
step S210, a cross brace is arranged among the plurality of upright posts.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A construction method of a cast-in-place box girder is characterized by comprising the following steps:
laying a strip foundation in a construction area;
a plurality of upright posts are connected and arranged on the strip-shaped foundation;
assembling construction supports on the plurality of upright columns;
installing construction formworks on the construction supports, enclosing the construction formworks to form a pouring space, and pouring concrete in the pouring space to form a beam body;
installing a prestressed pipeline in the poured concrete, tensioning a prestressed tendon in the prestressed pipeline, respectively inserting the end part of the prestressed tendon to the two ends of the beam body, and installing the prestressed tendon in the beam body to form a cast-in-place box beam;
wherein the step of assembling the construction bracket on the plurality of columns comprises:
obtaining a sand cylinder;
installing the sand cylinder at the top end of the upright post;
installing an I-shaped steel beam on the sand cylinder;
a Bailey beam is arranged on the I-shaped steel cross beam; and the number of the first and second groups,
and I-shaped steel distribution beams are arranged on the Bailey beams.
2. A cast-in-place box girder construction method as claimed in claim 1, wherein the step of obtaining a sand cylinder comprises:
arranging a sand cylinder bottom plate, and arranging a sand unloading hole on the sand cylinder bottom plate;
installing a first sand cylinder body on the sand cylinder bottom plate, and filling and leveling engineering sand in the first sand cylinder body;
a second sand cylinder body is sleeved on the first sand cylinder body, and the second sand cylinder body is movably arranged in the first sand cylinder body along the vertical direction; and the number of the first and second groups,
and a sand cylinder top plate is covered on the second sand cylinder body.
3. A cast-in-place box girder construction method as claimed in claim 2, wherein the step of installing the sand cylinders at the top ends of the columns comprises:
installing a connecting steel plate at the top end of the upright post;
hoisting the sand cylinder to the top end of the upright post;
and connecting the sand cylinder bottom plate to the connecting steel plate through bolts.
4. A cast-in-place box girder construction method as claimed in claim 3, wherein the step of installing an i-beam on the sand drum comprises:
installing a reserved steel plate on the sand cylinder top plate;
the I-shaped steel cross beam is welded on the reserved steel plate.
5. A cast-in-place box girder construction method as claimed in claim 4, wherein the steps of installing a prestressed pipe in the poured concrete, tensioning a prestressed tendon in the prestressed pipe, inserting end portions of the prestressed tendon to both ends of the girder body respectively, and installing the prestressed tendon in the girder body to form the cast-in-place box girder further comprise:
dismantling the construction formwork;
and removing the construction support.
6. A cast-in-place box girder construction method as claimed in claim 5, wherein the step of removing the construction forms further comprises, before the step of removing the construction forms:
and opening a sand unloading hole in the sand cylinder bottom plate, and discharging the engineering sand in the first sand cylinder to descend the construction support.
7. The cast-in-place box beam construction method of claim 6, wherein the step of removing the construction bracket further comprises, after the step of removing the construction bracket:
and storing the disassembled support rod pieces in a classified manner.
8. The cast-in-place box girder construction method according to claim 6, wherein the step of opening the sand discharge hole on the sand cylinder bottom plate and discharging the engineering sand in the first sand cylinder to descend the construction bracket further comprises the steps of:
and a sand collecting barrel is arranged at the position of the sand unloading hole opposite to the bottom plate of the sand barrel.
9. A cast-in-place box girder construction method as claimed in claim 1, wherein after the step of connecting and arranging a plurality of columns on the strip foundation, further comprising:
and a cross brace is arranged among the plurality of upright posts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011642916.9A CN112813836A (en) | 2020-12-31 | 2020-12-31 | Cast-in-place box girder construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011642916.9A CN112813836A (en) | 2020-12-31 | 2020-12-31 | Cast-in-place box girder construction method |
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| CN112813836A true CN112813836A (en) | 2021-05-18 |
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| KR101948026B1 (en) * | 2018-05-04 | 2019-05-02 | 주식회사 에이스이엔씨 | Pre-stressed concrete (psc) beam producing method for forming steel reinforcement assembly by connecting prefabricated segments of steel reinforcement assembly in construction field |
| CN111364364A (en) * | 2020-03-18 | 2020-07-03 | 重庆交通建设(集团)有限责任公司 | Construction method for cast-in-place prestressed concrete continuous box girder |
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2020
- 2020-12-31 CN CN202011642916.9A patent/CN112813836A/en active Pending
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| CN101424128A (en) * | 2008-12-12 | 2009-05-06 | 中建三局建设工程股份有限公司 | Civil engineering construction flask device |
| CN101876160A (en) * | 2009-10-22 | 2010-11-03 | 中铁九局集团第三工程有限公司 | Method for installing bracket used for in-situ casting concrete continuous girder bridge on soft soil foundation |
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