CN113308996A - Lowering method based on cable-stayed bridge cradle bottom basket lowering device - Google Patents
Lowering method based on cable-stayed bridge cradle bottom basket lowering device Download PDFInfo
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- CN113308996A CN113308996A CN202110494854.XA CN202110494854A CN113308996A CN 113308996 A CN113308996 A CN 113308996A CN 202110494854 A CN202110494854 A CN 202110494854A CN 113308996 A CN113308996 A CN 113308996A
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- lowering
- anchorage device
- clamping piece
- basket
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
According to the method for lowering the basket bottom lowering device of the cable-stayed bridge, the tensioning unit is arranged at the reserved hole channel on the beam body to replace a traditional crane, the work transfer stress points are removed through tightening and loosening of the upper anchor clamping piece and the lower anchor clamping piece in the tensioning unit, so that the steel strand penetrating through the upper anchor, the through jack, the distribution beam, the lower anchor and the beam body can be slowly lowered at a constant speed, the stress points are converted in a mode that the upper anchor and the lower anchor are respectively matched with the upper anchor clamping piece and the lower anchor clamping piece in the steel strand lowering process, the basket bottom lowering device of the basket is slowly and uniformly lowered under the telescopic motion of the through jack cylinder, and the basket bottom lowering purpose is achieved. The lowering method provided by the invention has the advantages of simple steps, easiness in installation and operation, low equipment cost, high safety and high working efficiency.
Description
Technical Field
The invention belongs to the technical field of bridge construction hanging basket dismantling, and particularly relates to a lowering method based on a cable-stayed bridge hanging basket bottom basket lowering device.
Background
A large amount of hanging basket dismantling operations are faced in a continuous beam construction hanging basket method, a common crane is used for decomposition and downward placement in the air, but in the implementation process, binding of steel wire ropes, scraping of edges and corners, static to dynamic instantaneous impact load and the like are high in construction safety risk, and meanwhile, the crane is used for integrally dismantling machinery, so that the cost is high, and adverse factors are large in the operation process. Meanwhile, when the hanging basket needs to be removed after the construction of the closure section is finished, the upper diamond frame of the hanging basket can be withdrawn to the turning radius of the tower crane for removal, but the bottom basket cannot be withdrawn.
In order to solve the above problems, a method for completing the integral lowering of the bottom basket of the cradle by utilizing the extension and retraction of a straight-through jack appears, for example, patent CN 106812069 a discloses a bottom basket lowering device and method of the high buttress cradle in mountainous areas, but the invention still has the following defects: 1. according to the invention, the sling at the edge of the bottom basket is fixed by the gear jack, and the bottom rail is connected with the hydraulic piercing jack through the finish rolling deformed steel bar by the connecting rod, the chain block and the steel wire rope, so that the purpose of replacing the sling by the finish rolling deformed steel bar connected with the hydraulic piercing jack is achieved, and the method has the advantages of complex steps, inconvenience in operation, large workload, high material consumption and low efficiency; 2. according to the invention, a hole channel is specially drilled in the middle of the top plate of the beam body to destroy the structure of the beam body, meanwhile, because the finish rolling deformed steel bar has a fixed length, the connection is needed through a connector when the finish rolling deformed steel bar is placed downwards, the problem of blocking easily occurs when the connector passes through the hole channel of the piercing jack, and meanwhile, because the finish rolling deformed steel bar is fixed by using the finish rolling bolt, the finish rolling bolt needs to be screwed for many times in the placing process, the workload is large, the distance needs to be accurately screwed, and the operation is inconvenient. Accordingly, improvements in the prior art are needed to address the above-mentioned deficiencies.
Disclosure of Invention
The invention provides a lowering method based on a cable-stayed bridge cradle bottom basket lowering device.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a lowering method based on a cable-stayed bridge cradle bottom basket lowering device comprises the following steps:
(1) placing a lower anchorage device at a reserved hole channel on a beam body, laying two supporting beams on two sides of the lower anchorage device, sequentially penetrating a steel strand connected with a bottom basket of a hanging basket upwards through the reserved hole channel and the lower anchorage device, placing a lower anchorage device clamping piece into the lower anchorage device, and then tightening and fixing the steel strand;
(2) the distribution beam is fixed above the two support beams, the through jack is placed on the through hole in the middle of the distribution beam, and the upper anchorage device is placed on the top of the through jack;
(3) the steel strand extends out of the lower anchorage device and continuously penetrates through the through hole in the distribution beam, the through jack and the upper anchorage device upwards;
(4) after the lowering device is installed, the hanging strip on the bottom basket of the hanging basket is removed, so that the whole weight of the bottom basket of the hanging basket is transferred to the steel strand to be stressed;
(5) the center-penetrating jack is stretched to the maximum stroke, and the upper anchorage device clamping piece is placed into the upper anchorage device to be tightened to fix the steel strand, so that the upper anchorage device is stressed;
(6) pulling the lower anchor clamping piece loose and dismantling the lower anchor clamping piece to enable the penetrating jack to return oil and contract, and synchronously lowering the upper anchor and the steel strand fixed by the upper anchor when the oil cylinder contracts so as to drive the bottom basket of the cradle to slowly lower at a constant speed;
(7) when the oil cylinder of the center-penetrating jack contracts to the stroke of at least 2cm, tightening the clamping piece of the lower anchor to stress the lower anchor, pulling the clamping piece of the upper anchor loose and removing the clamping piece, and continuing to contract the oil cylinder of the center-penetrating jack to 0cm, namely completing the single lowering operation;
(8) and (5) repeating the steps (5) to (7) until the bottom basket of the hanging basket falls on the ground stably.
And (3) the lower anchorage device in the step (1) is vertically corresponding to the anchorage device hole of the upper anchorage device in the step (2).
And (2) the steel strands in the reserved pore channel in the step (1) are two bundles.
And (7) tightening the lower anchor clamping piece when the center-through jack returns oil and contracts to the stroke of the oil cylinder to be 2 cm.
Compared with the prior art, the lowering method of the bottom basket lowering device of the cable-stayed bridge cradle has the beneficial effects that: 1. according to the invention, the tensioning unit is arranged at the reserved pore canal of the beam wing plate, so that additional punching is not needed, the workload is saved, and the beam structure is protected; 2. according to the invention, the steel strand connected with the bottom basket of the hanging basket is used for replacing finish rolling deformed steel bar, so that not only are the consumables saved, the equipment cost required by construction reduced, but also the deformed steel bar connector is saved, the jamming problem caused by the larger diameter of the deformed steel bar connector in the lowering process is avoided, and the equipment stability and the construction safety are improved; 3. in the lowering process, the stress points are converted by using the upper anchor and the lower anchor to be respectively matched with the upper anchor clamping piece and the lower anchor clamping piece, so that the bottom basket of the hanging basket is slowly and uniformly lowered under the telescopic motion of the oil cylinder of the straight-through jack, and the upper anchor clamping piece and the lower anchor clamping piece are easy to tighten and loosen and disassemble, so that the operation is easy, the position deviation is not easy to generate, the workload is reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic view of the overall structure provided by the present invention;
fig. 2 is a schematic layout view of a tension unit according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a tension unit provided in the present invention;
FIG. 4 is a front view of the construction of the distributor beam of the present invention;
fig. 5 is a side view of a distribution beam of the present invention.
In the figure: 1-steel strand, 2-upper anchorage device, 3-distribution beam, 4-lower anchorage device, 5-supporting beam, 6-punching jack, 7-hanging basket bottom basket, 8-beam body, 9-reserved hole channel, 10-upper anchorage device clamping piece, 11-stiffening plate and 12-lower anchorage device clamping piece.
Detailed Description
The invention is further illustrated by the following figures and examples.
The cable-stayed bridge cradle bottom basket lowering device provided by the embodiment of the invention at least comprises a steel strand 1 connected with the side edge of a cradle bottom basket 7, as shown in figures 1 to 3, the lowering device comprises four groups of tensioning units, the four groups of tensioning units are symmetrically distributed on a reserved pore passage 9 of a beam body 8, and each group of tensioning units comprises a through jack 6, a supporting beam 5, a distributing beam 3, an upper anchorage device 2, a lower anchorage device 4, an upper anchorage device clamping piece 10 and a lower anchorage device clamping piece 12; the lower anchorage device is positioned at a reserved pore passage 9 on the beam body, two support beams are laid on two sides of the lower anchorage device, and the support beams are formed by double-spliced 40I-shaped steel; the distribution beam is fixed above the two support beams, as shown in fig. 4 and 5, the distribution beam is composed of two ribbed 25 i-steel and a stiffening plate 11, wherein the stiffening plate is fixed at the top and the bottom of the two ends of the distribution beam, and the stiffening plate is made of a 1cm thick steel plate; the middle part of the distribution beam is also provided with a through hole for the steel strand to pass through, the center-penetrating jack is positioned above the through hole, and the upper anchorage device is positioned at the top of the center-penetrating jack; the steel strand upward sequentially passes through the reserved hole channel, the lower anchorage device, the through hole, the through jack and the upper anchorage device, the steel strand is in a straightening state in the vertical direction, the anchorage device holes of the upper anchorage device and the lower anchorage device vertically correspond to each other, and the steel strand is fixed through the upper anchorage device clamping piece and the lower anchorage device clamping piece respectively.
The lowering method of the bottom basket lowering device of the cable-stayed bridge cradle provided by the embodiment of the invention comprises the following specific steps:
(1) placing a lower anchorage device at a reserved hole channel on a beam body, laying two supporting beams on two sides of the lower anchorage device, sequentially penetrating a steel strand connected with a bottom basket of a hanging basket upwards through the reserved hole channel and the lower anchorage device, placing a lower anchorage device clamping piece into the lower anchorage device, and then tightening and fixing the steel strand;
(2) the distribution beam is fixed above the two support beams, the through jack is placed on the through hole in the middle of the distribution beam, and the upper anchorage device is placed on the top of the through jack;
(3) the steel strand extends out of the lower anchorage device and continuously penetrates through the through hole in the distribution beam, the through jack and the upper anchorage device upwards;
(4) after the lowering device is installed, the hanging strip on the bottom basket of the hanging basket is removed, so that the whole weight of the bottom basket of the hanging basket is transferred to the steel strand to be stressed;
(5) the center-penetrating jack is stretched to the maximum stroke, and the upper anchorage device clamping piece is placed into the upper anchorage device and tightened to fix the steel strand, so that the upper anchorage device is stressed;
(6) pulling out and detaching the lower anchor clamping piece to enable the oil return of the center-penetrating jack to shrink to the stroke of an oil cylinder to be 2cm, and synchronously lowering the upper anchor and the steel strand fixed by the upper anchor when the oil cylinder shrinks so as to drive the bottom basket of the hanging basket to slowly lower at a constant speed;
(7) and when the oil cylinder of the feed-through jack contracts to 2cm, tightening the lower anchor clamping piece to stress the lower anchor, pulling the upper anchor clamping piece loose and removing, and continuing to contract the oil cylinder of the feed-through jack to 0cm, namely completing the single lowering operation.
(8) And (5) repeating the steps (5) to (7) until the bottom basket of the hanging basket falls on the ground stably.
The states and conditions of all parts of the lowering device, in particular the states and conditions of the upper anchor clamping piece and the lower anchor clamping piece, are checked for many times in the lowering process. The steps (1) - (8) are applied to four tensioning units in the lowering device, and the four tensioning units are uniformly stressed and are synchronously lowered.
In combination with the above embodiments, the lowering method based on the cable-stayed bridge cradle bottom basket lowering device provided by the invention has the advantages that the tensioning unit is arranged at the reserved hole passage on the beam body to replace the traditional crane, and the work transfer stress points are removed through tightening and loosening of the upper anchor clamping piece and the lower anchor clamping piece in the tensioning unit, so that the steel strand penetrating through the upper anchor, the through jack, the distribution beam, the lower anchor and the beam body can be slowly lowered at a constant speed, and the purpose of lowering the cradle bottom basket is achieved. The lowering method provided by the invention has the advantages of simple steps, easiness in installation and operation, low equipment cost, high safety and high working efficiency.
Claims (4)
1. A lowering method based on a cable-stayed bridge cradle bottom basket lowering device is characterized by comprising the following steps:
(1) placing a lower anchorage device at a reserved hole channel on a beam body, laying two supporting beams on two sides of the lower anchorage device, sequentially penetrating a steel strand connected with a bottom basket of a hanging basket upwards through the reserved hole channel and the lower anchorage device, placing a lower anchorage device clamping piece into the lower anchorage device, and then tightening and fixing the steel strand;
(2) the distribution beam is fixed above the two support beams, the through jack is placed on the through hole in the middle of the distribution beam, and the upper anchorage device is placed on the top of the through jack;
(3) the steel strand extends out of the lower anchorage device and continuously penetrates through the through hole in the distribution beam, the through jack and the upper anchorage device upwards;
(4) after the lowering device is installed, the hanging strip on the bottom basket of the hanging basket is removed, so that the whole weight of the bottom basket of the hanging basket is transferred to the steel strand to be stressed;
(5) the center-penetrating jack is stretched to the maximum stroke, and the upper anchorage device clamping piece is placed into the upper anchorage device to be tightened to fix the steel strand, so that the upper anchorage device is stressed;
(6) pulling the lower anchor clamping piece loose and dismantling the lower anchor clamping piece to enable the penetrating jack to return oil and contract, and synchronously lowering the upper anchor and the steel strand fixed by the upper anchor when the oil cylinder contracts so as to drive the bottom basket of the cradle to slowly lower at a constant speed;
(7) when the oil cylinder of the center-penetrating jack contracts to the stroke of at least 2cm, tightening the clamping piece of the lower anchor to stress the lower anchor, pulling the clamping piece of the upper anchor loose and removing the clamping piece, and continuing to contract the oil cylinder of the center-penetrating jack to 0cm, namely completing the single lowering operation;
(8) and (5) repeating the steps (5) to (7) until the bottom basket of the hanging basket falls on the ground stably.
2. The lowering method based on the cable-stayed bridge hanging basket bottom basket lowering device according to claim 1, characterized in that: and (3) the lower anchorage device in the step (1) is vertically corresponding to the anchorage device hole of the upper anchorage device in the step (2).
3. The lowering method based on the cable-stayed bridge hanging basket bottom basket lowering device according to claim 1, characterized in that: and (2) the steel strands in the reserved pore channel in the step (1) are two bundles.
4. The lowering method based on the cable-stayed bridge hanging basket bottom basket lowering device according to claim 1, characterized in that: and (7) tightening the lower anchor clamping piece when the center-through jack returns oil and contracts to the stroke of the oil cylinder to be 2 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494854.XA CN113308996A (en) | 2021-05-07 | 2021-05-07 | Lowering method based on cable-stayed bridge cradle bottom basket lowering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494854.XA CN113308996A (en) | 2021-05-07 | 2021-05-07 | Lowering method based on cable-stayed bridge cradle bottom basket lowering device |
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| Publication Number | Publication Date |
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| CN113308996A true CN113308996A (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110494854.XA Pending CN113308996A (en) | 2021-05-07 | 2021-05-07 | Lowering method based on cable-stayed bridge cradle bottom basket lowering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162195A (en) * | 2022-08-04 | 2022-10-11 | 中铁一局集团(广州)建设工程有限公司 | Internal mold hanging bracket device for prestressed concrete short-tower cable-stayed bridge construction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758826A (en) * | 2016-11-25 | 2017-05-31 | 中铁大桥局集团第五工程有限公司 | A kind of apparatus and method for removing dragging suspension basket for overall decentralization |
| CN106812069A (en) * | 2017-03-01 | 2017-06-09 | 杭州市交通工程集团有限公司 | The bottom of mountain area buttress Hanging Basket high stops puts device and method |
| CN209873584U (en) * | 2019-03-25 | 2019-12-31 | 中铁十六局集团第二工程有限公司 | Hang basket template and demolish device |
| CN112554076A (en) * | 2020-12-22 | 2021-03-26 | 中交二公局第三工程有限公司 | Continuous small-stroke hanging basket bottom basket lowering device and construction method |
-
2021
- 2021-05-07 CN CN202110494854.XA patent/CN113308996A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758826A (en) * | 2016-11-25 | 2017-05-31 | 中铁大桥局集团第五工程有限公司 | A kind of apparatus and method for removing dragging suspension basket for overall decentralization |
| CN106812069A (en) * | 2017-03-01 | 2017-06-09 | 杭州市交通工程集团有限公司 | The bottom of mountain area buttress Hanging Basket high stops puts device and method |
| CN209873584U (en) * | 2019-03-25 | 2019-12-31 | 中铁十六局集团第二工程有限公司 | Hang basket template and demolish device |
| CN112554076A (en) * | 2020-12-22 | 2021-03-26 | 中交二公局第三工程有限公司 | Continuous small-stroke hanging basket bottom basket lowering device and construction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162195A (en) * | 2022-08-04 | 2022-10-11 | 中铁一局集团(广州)建设工程有限公司 | Internal mold hanging bracket device for prestressed concrete short-tower cable-stayed bridge construction |
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Application publication date: 20210827 |