CN109457626B - Method for mounting precast beam in height-limited area - Google Patents
Method for mounting precast beam in height-limited area Download PDFInfo
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- CN109457626B CN109457626B CN201811212678.0A CN201811212678A CN109457626B CN 109457626 B CN109457626 B CN 109457626B CN 201811212678 A CN201811212678 A CN 201811212678A CN 109457626 B CN109457626 B CN 109457626B
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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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention provides a method for installing a precast beam in a height-limited area, which comprises the steps of equipment installation, precast beam hoisting, precast beam longitudinal transportation, precast beam transverse transportation and beam falling. According to the method for installing the precast beam in the height-limited area, the longitudinal walking track of the temporary support and the transverse slide on the pier are arranged to serve as precast beam transportation channels, so that the hoisting area is allowed to be arranged at a position away from the height-limited area by a certain distance, then the precast beam in the height-limited area is installed by three-way movement of longitudinal movement, dragging transverse movement and falling beam vertical movement of the track flat car, and the problem that the installation clearance height of the precast beam is insufficient is smoothly solved.
Description
Technical Field
The invention relates to a method for installing a precast beam, in particular to a method for installing a precast beam in a height-limited area.
Background
In the installation of the precast beam in the prior art, a crane is generally adopted to hoist the precast beam to the pier top for assembly. However, for some bridge construction positions, 220KV overhead high-voltage lines are arranged above bridge piers, the height of the high-voltage lines from the ground is usually about 20m, the distance between the top of the bridge and the high-voltage lines is 12.56m at the lowest, and the operation safety distance required by the power department is not less than 8m, so the installation operation space of the precast beam is less than 5m, a height-limited area is formed, and when the precast beam is subjected to conventional hoisting operation, the safety distance between a suspension arm and the high-voltage lines is seriously insufficient due to the limitation of the height-limited area, so that the precast beam is inconvenient to install.
Disclosure of Invention
In view of the above problems, there is provided a method for facilitating installation of a precast beam in a height-limited zone.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method of installing precast girders in a height-limited zone, comprising the steps of:
equipment installation: installing a temporary support, wherein the temporary support extends to a hoisting area outside the height limiting area, laying a longitudinal walking track on the top surface of the temporary support along the bridge direction, and installing a rail flat car on the longitudinal walking track through a crane in the hoisting area; installing a transverse slideway on the top surface of the pier, wherein the length direction of the transverse slideway is vertical to the length direction of the longitudinal walking track;
hoisting a precast beam: the rail flat car is driven to move to a hoisting area along a longitudinal walking rail, and the precast beam is hoisted and placed on the rail flat car through a crane positioned in the hoisting area;
and (3) longitudinal transportation of the precast beam: starting the rail flat car, driving the precast beam to be transported along a longitudinal walking rail through the rail flat car, enabling the precast beam to be located at an installation position meeting the requirement of a transverse position, and enabling two opposite ends of the precast beam to be located right above two adjacent piers respectively;
and (3) transverse transportation of the precast beam: the method comprises the following steps that a sliding block is installed on a pier top transverse slideway in a sliding mode, the sliding block is supported at the bottom of a precast beam, and the sliding block is connected with a driving device through a steel strand, so that the precast beam moves to an installation position meeting the requirement of a transverse position along the transverse slideway under the driving of the driving device;
and (3) beam falling: after the precast beam moves longitudinally and transversely in place, a jack is arranged on a pier and is abutted against the bottom of the precast beam, a sliding block and a transverse slideway are removed, a support is installed on the pier, the precast beam falls onto the support through the unloading of the jack, and the beam falling is completed.
Further, the temporary support is a steel structure support.
Further, in the step of dropping the beam, if the beam needs to be dropped step by step, a step of supporting a support member on a non-support position of the pier to support the precast beam is further included, and the support member is a sleeper.
Further, in the step of installing the equipment, if the top surface of the pier top is uneven, leveling sleepers need to be paved on the pier top to level the top surface of the pier top, and then a slideway plate steel plate is installed on the leveling sleepers to form a transverse slideway of the precast beam; in the step of beam falling, after the transverse slide way is removed, the step of removing the leveling sleeper on the top surface of the pier top is also included.
Further, the supporting surface of the rail flat car and the top surface of the sliding block are located on the same horizontal plane.
Furthermore, the number of the rail flatcars is two, and the two rail flatcars are respectively supported at two opposite ends of the precast beam.
Further, the pier includes the pier stud and connects in the bent cap of pier stud top surface, horizontal slide install in the top surface of bent cap.
Furthermore, the driving device is a continuous jack, the continuous jack is installed at one end of the pier, the sliding block is provided with an installation hole, one end of the steel strand is connected with the continuous jack, and the other end of the steel strand penetrates through the installation hole and is fixed through a tool anchor; the steel strand is horizontally arranged.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the method for installing the precast beam in the height-limited area, the longitudinal walking track of the temporary support and the transverse slide on the pier are arranged to serve as precast beam transportation channels, so that the hoisting area is allowed to be arranged at a position away from the height-limited area by a certain distance, then the precast beam in the height-limited area is installed by three-way movement of longitudinal movement, dragging transverse movement and falling beam vertical movement of the track flat car, and the problem that the installation clearance height of the precast beam is insufficient is smoothly solved.
Drawings
Fig. 1 is a schematic view illustrating a method for installing precast girders in a height-limited zone according to a preferred embodiment of the present invention.
Fig. 2 is a schematic top view of fig. 1 with the precast girders omitted.
Fig. 3 is a schematic view of fig. 1 in another state.
Fig. 4 is a left side view of fig. 1 with the slider installed.
Fig. 5 is an enlarged view of fig. 4 at a.
Fig. 6 is a schematic working diagram of fig. 1 when the beam is dropped.
Fig. 7 is an enlarged view of fig. 6 at B.
Fig. 8 is a schematic working view of fig. 4 when the beam is dropped.
Description of the main elements
1-pier, 2-high voltage cable, 3-height limiting area, 4-temporary support, 5-hoisting area, 6-longitudinal walking track, 7-crane, 8-track flat car, 81-car body, 83-walking wheel, 87-supporting surface, 10-transverse slideway, 11-first pier, 12-second pier, 13-pier column and 14-capping beam, 15-leveling sleepers, 16-slideway steel plates, 17-sliding blocks, 171-mounting holes, 18-driving devices, 19-tool anchors, 20-jacks, 21-supports, 22-steel strands, 23-stainless steel plates, 24-oil inlet pipelines, 25-oil return pipelines, 26-oil pumps, 200-precast beams and 300-cushion stones.
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 will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, in a preferred embodiment of the present invention, a method for installing a precast girder 200 in a height-limited zone 3 is provided, in which a high voltage cable 2 is installed above a pier 1, and the height-limited zone 3 is formed below the high voltage cable 2. The method for installing the precast girders 200 in the height-limited zone 3 includes the steps of:
equipment installation: building a temporary support 4, extending the temporary support 4 to a hoisting area 5 outside the height limiting area 3, paving a longitudinal walking track 6 on the top surface of the temporary support 4 along the bridge direction, and installing a rail flat car 8 on the longitudinal walking track 6 through a crane 7 in the hoisting area 5; a transverse slideway 10 is arranged on the top surface of the pier 1, and the length direction of the transverse slideway 10 is vertical to the length direction of the longitudinal walking track 6.
In the present embodiment, the precast beam 200 is installed between two adjacent piers 1, and the two adjacent piers 1 are referred to as a first pier 11 and a second pier 12, respectively. First pier 11 and second pier 12 all include pier stud 13 and connect in the bent cap 14 of pier stud 13 top surface, and horizontal slide 10 is installed in the bent cap 14 top surface of first pier 11 and the bent cap 14 top surface of second pier 12. The temporary support 4 is preferably made of steel structure support and meets the requirements of bearing capacity and beam transportation. The temporary stay 4 is positioned below the high-voltage cable 2, and in the present embodiment, the temporary stay 4 is installed between the first pier 11 and the second pier 12 and on the side of the second pier 12 facing away from the first pier 11, and the vertical travel rail 6 spans the second pier 12. Two longitudinal running rails 6 are mounted on the top surface of the temporary support 4. The installation of the longitudinal walking track 6 requires that the track installation is smooth, straight and firm. The rail flat car 8 is driven by electric power and is connected with an electric power device to test and run. The rail flat car 8 is obtained from the market directly, and its structure belongs to the prior art, and includes a car body 81, two traveling wheels 83 rotatably mounted on the bottom of the car body 81, and a flat car driving mechanism (not shown) mounted on the car body 81 and driving the traveling wheels 83 to travel. The top of the vehicle body 81 is provided with a support surface 87 that supports the precast beam 200. The circumferential wall of each walking wheel 83 is concavely provided with a limiting groove (not shown), and the limiting grooves of the two walking wheels 83 are respectively used for being connected with the two longitudinal walking rails 6 in a sliding manner. Preferably, the number of the rail vehicles 8 is two, and the rail vehicles 8 are respectively used for supporting two opposite ends of the precast girders 200, so that the support of the precast girders 200 by the rail vehicles 8 is more stable.
The transverse slide way 10 is of a flat plate structure, when the transverse slide way 10 is installed on the top surfaces of the bent caps 14 of the first and second piers 11 and 12, if the top surfaces of the bent caps 14 are provided with the cushion stones 300, the longitudinal walking rails 6 and the like, so that the pier tops are uneven, leveling sleepers 15 need to be paved on the pier tops to level the top surfaces of the piers 1 (figure 4), and then the leveling sleepers 15 are provided with the slide way plate steel plates 16 to form the transverse slide way 10 of the precast beam 200, so that the follow-up beam falling requirement is met, and the precast beam 200 is enabled to be transversely moved stably.
Hoisting the precast beam 200: referring to fig. 1 to 3, the rail flat car 8 is driven to move along the longitudinal traveling rail 6 to the hoisting area 5, and the precast beam 200 is lifted and placed on the rail flat car 8 by the crane 7 located in the hoisting area 5. In this embodiment, the rail flatcar 8 is first driven to the hoisting area 5 outside the height-limiting area 3 along the longitudinal traveling rail 6, and the precast beam 200 is hoisted and placed on the rail flatcar 8 by the two cranes 7, so that the opposite ends of the precast beam 200 are respectively located on the supporting surfaces 87 of the two rail flatcars 8. Hoist 7 is located hoist and mount district 5 outside limit for high district 3 for hoist and mount of hoist 7 is not restricted by limit for high district 3, in order to do benefit to hoist and mount operation of hoist 7, precast beam 200 supports on two flat rail cars 8, can adopt the wiring rope to fix precast beam 200 and flat rail car 8, makes precast beam 200 and flat rail car 8's installation more firm, improves the security.
Longitudinal transportation of the precast beam 200: the rail flat car 8 is started, the prefabricated beam 200 is driven by the rail flat car 8 to be transported to the position to be installed, meeting the requirement of the longitudinal position, of the longitudinal walking rail 6, and at the moment, the two opposite ends of the prefabricated beam 200 are located right above the first pier 11 and the second pier 12 respectively. In the present embodiment, the rail flat car 8 drives the precast beam 200 to move to the height-limiting area 3 along the longitudinal traveling rail 6, and adjusts the longitudinal position of the precast beam 200 to meet the longitudinal position requirement.
Transverse transportation of the precast beam 200: referring to fig. 4 and 5, the sliding blocks 17 are slidably mounted on the transverse slideways 10 of the first pier 11 and the second pier 12, after the precast beam 200 is longitudinally transported to a proper position, the sliding blocks 17 are supported at the bottom of the precast beam 200, and the sliding blocks 17 are connected with a driving device 18 by using the steel strands 22, so that the precast beam 200 is driven by the driving device 18 to move along the transverse slideways 10 along with the sliding blocks 17 to an installation position meeting the requirement of a transverse position.
In the present embodiment, the driving device 18 is a continuous jack, which is connected to an oil pump 26 through an oil inlet pipe 24 and an oil return pipe 25, and the continuous jack is installed at one end of the pier 1 far from the temporary support 4. The sliding block 17 is provided with a mounting hole 171, one end of the steel strand 22 is connected with the continuous jack, and the other end of the steel strand 22 penetrates through the mounting hole 171 and is fixed through the tool anchor 19; the steel strands 22 are arranged horizontally. Preferably, the sliding block 17 is formed by welding double-spliced channel steel so as to have better strength. A stainless steel plate 23 is welded to one side of the slider 17. The mounting hole 171 is formed through the stainless steel plate 23. Preferably, continuous jacks are mounted on the first pier 11 and the second pier 12, and the two continuous jacks are respectively connected with the sliding blocks 17 supported at the two ends of the precast beam 200 through the steel strands 22, so that the precast beam 200 can move more stably. In addition, the mode that the continuous jack pulls the sliding block 17 to drive the precast beam 200 to move transversely can prevent the precast beam 200 from toppling over in the transverse moving process, so that the production safety is further improved. The arrangement of the sliding blocks 17 can reduce the friction between the precast beam 200 and the transverse slide 10, and is more beneficial to the transverse movement of the precast beam 200.
And (3) beam falling: referring to fig. 6 to 8, after the precast beam 200 moves in place in the longitudinal and transverse directions, the jacks 20 are arranged on the first pier 11 and the second pier 12, the jacks 20 are abutted against the bottom of the precast beam 200, the sliding blocks 17, the transverse slide ways 10 and the leveling sleepers 15 (see the precast beam on the right side of fig. 8) are removed, the support 21 is installed at the preset positions of the first pier 11 and the second pier 12, and the precast beam 200 is dropped onto the support 21 (see the precast beam on the left side of fig. 8) by unloading the jacks 20, so that the dropping of the precast beam 200 is completed; the height of the support 21 should be such that the precast beam 200 falls on the support 21 to meet the vertical position requirement. The jack 20 is connected with an oil return pipe 25 and an oil pump 26 through an oil inlet pipe 24 to provide power for the jack 20.
In the beam falling step, if the beam falling distance of the precast beam 200 is greater than the stroke of the jack 20, the beam is required to be fallen step by step, and the step of supporting the precast beam 200 by supporting a support member on a non-support 21 position of the pier 1 (i.e., a position where the support 21 is not required to be installed on the pier top) is further included when the beam is fallen step by step.
Preferably, the support surface 87 of the rail wagon 8 is at the same level as the top surface of the slide 17, so that the beam is more convenient, smooth and safe to drop.
According to the method for installing the precast beam 200 in the height-limiting area 3, the longitudinal traveling rail 6 of the temporary support 4 and the transverse slide ways 10 on the piers 1 are arranged as the precast beam 200 transportation channel, so that the hoisting area 5 is allowed to be arranged at a position away from the height-limiting area 3 by a certain distance, then the precast beam 200 in the height-limiting area 3 is installed by three-way movement of longitudinal movement, dragging transverse movement and beam falling vertical movement of the rail flat car 8, and the problem of insufficient installation clearance height of the precast beam 200 is smoothly solved; the installation process of the precast beam 200 is stable, and the danger coefficient is reduced; low cost and good economic benefit.
It is understood that in other embodiments, other members may be installed above the pier 1, such as a building, etc., and the height-limiting zone 3 is formed below the building.
It is understood that the installation position of the temporary support 4 may be set according to the position of the actual height limit area 3, and is not limited to the present embodiment.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (8)
1. A method of installing precast girders in a height-limited zone, comprising the steps of:
equipment installation: installing a temporary support, wherein the temporary support extends to a hoisting area outside the height limiting area, laying a longitudinal walking track on the top surface of the temporary support along the bridge direction, and installing a rail flat car on the longitudinal walking track through a crane in the hoisting area; installing a transverse slideway on the top surface of the pier, wherein the length direction of the transverse slideway is vertical to the length direction of the longitudinal walking track;
hoisting a precast beam: the rail flat car is driven to move to a hoisting area along a longitudinal walking rail, and the precast beam is hoisted and placed on the rail flat car through a crane positioned in the hoisting area;
and (3) longitudinal transportation of the precast beam: starting the rail flat car, driving the precast beam to be transported along a longitudinal walking rail through the rail flat car, enabling the precast beam to be located at an installation position meeting the requirement of a transverse position, and enabling two opposite ends of the precast beam to be located right above two adjacent piers respectively;
and (3) transverse transportation of the precast beam: the prefabricated beam is driven by the driving device to move along the transverse slide way along with the slide block to a mounting position meeting the requirement of the transverse position;
and (3) beam falling: after the precast beam moves longitudinally and transversely in place, a jack is arranged on a pier and is abutted against the bottom of the precast beam, a sliding block and a transverse slideway are removed, a support is installed on the pier, the precast beam falls onto the support through the unloading of the jack, and the beam falling is completed.
2. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: the temporary support is a steel structure support.
3. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: and in the step of beam falling, if the beam needs to be dropped step by step, a step of supporting a support piece on the non-support position of the pier to support the precast beam is further included, wherein the support piece is a sleeper.
4. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: in the step of equipment installation, if the top surface of the pier top is uneven, leveling sleepers need to be paved on the pier top to level the top surface of the pier top, and then sliding plate steel plates are installed on the leveling sleepers to form a transverse slide way of the precast beam; in the step of beam falling, after the transverse slide way is removed, the step of removing the leveling sleeper on the top surface of the pier top is also included.
5. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: the supporting surface of the rail flat car and the top surface of the sliding block are positioned on the same horizontal plane.
6. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: the number of the rail flat cars is two, and the two rail flat cars are respectively supported at two opposite ends of the precast beam.
7. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: the pier comprises a pier column and a cover beam connected to the top surface of the pier column, and the transverse slide way is installed on the top surface of the cover beam.
8. A method of installing a precast girder at a height-limited zone according to claim 1, wherein: the driving device is a continuous jack, the continuous jack is installed at one end of the bridge pier, the sliding block is provided with an installation hole, one end of the steel strand is connected with the continuous jack, and the other end of the steel strand penetrates through the installation hole and is fixed through a tool anchor; the steel strand is horizontally arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811212678.0A CN109457626B (en) | 2018-10-18 | 2018-10-18 | Method for mounting precast beam in height-limited area |
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| CN201811212678.0A CN109457626B (en) | 2018-10-18 | 2018-10-18 | Method for mounting precast beam in height-limited area |
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| CN109457626B true CN109457626B (en) | 2021-08-24 |
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| CN109914263B (en) * | 2019-04-11 | 2020-10-30 | 中交二公局第五工程有限公司 | Construction method for low-clearance beam erection of crossed underpass bridge |
| CN110242055A (en) * | 2019-05-08 | 2019-09-17 | 江苏江都建设集团有限公司 | A kind of steel truss installation method |
| CN110578301A (en) * | 2019-09-19 | 2019-12-17 | 常州市市政建设工程有限公司 | Steel box girder longitudinal and transverse sliding construction process |
| CN110629681A (en) * | 2019-09-26 | 2019-12-31 | 常州市市政建设工程有限公司 | Multi-span steel box girder construction process |
| CN111335185A (en) * | 2020-04-07 | 2020-06-26 | 中铁三局集团线桥工程有限公司 | Large-tonnage box girder erection construction system for realizing height control and erection method thereof |
| CN111576183A (en) * | 2020-04-16 | 2020-08-25 | 中铁三局集团华东建设有限公司 | A construction method for longitudinally moving frame of box girder |
| CN111705681B (en) * | 2020-05-25 | 2022-05-03 | 中铁十七局集团第三工程有限公司 | Low-position longitudinal displacement method for box girder |
| CN112224642B (en) * | 2020-09-23 | 2023-01-24 | 中国五冶集团有限公司 | Device and method for mounting and conveying steel structural member adjusting piece |
| CN112758862B (en) * | 2020-12-24 | 2022-05-20 | 中国十九冶集团有限公司 | Roller way installation method |
| CN113279335A (en) * | 2021-06-08 | 2021-08-20 | 中交二航局第四工程有限公司 | Device and method for mounting large-tonnage and wide-width steel box girder across mountain ridge |
| CN114214922A (en) * | 2021-11-09 | 2022-03-22 | 广西路桥工程集团有限公司 | Tunnel bridge head-span precast beam side beam and erection method thereof |
| CN114045755A (en) * | 2021-11-23 | 2022-02-15 | 中铁七局集团有限公司 | Auxiliary trolley machine construction method for small clearance frame beam construction |
| CN114277695A (en) * | 2022-01-24 | 2022-04-05 | 中铁上海工程局集团有限公司 | Construction method of steel reinforced concrete composite beam close to business line |
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| CN102650118B (en) * | 2012-05-18 | 2013-12-04 | 江西建工第二建筑有限责任公司 | Construction device and method for erecting prefabricated beam by slip method |
| KR101654742B1 (en) * | 2015-02-26 | 2016-09-06 | 컨텍이앤씨 주식회사 | Movable scaffolding system mounted upper-structure of bridge and bridge construction method therewith |
| CN107254849A (en) * | 2017-07-14 | 2017-10-17 | 中国冶集团有限公司 | Steel box-girder installation method under a kind of clear height constrained state |
| CN108385530B (en) * | 2018-02-24 | 2023-09-15 | 中国建筑第六工程局有限公司 | Tooling and method for erecting prefabricated box girder of wide-section spliced by cross-sea expressway |
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