CN113818354A - Method for quickly dismantling temporary support under condition of limited vertical space - Google Patents
Method for quickly dismantling temporary support under condition of limited vertical space Download PDFInfo
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- CN113818354A CN113818354A CN202111155371.3A CN202111155371A CN113818354A CN 113818354 A CN113818354 A CN 113818354A CN 202111155371 A CN202111155371 A CN 202111155371A CN 113818354 A CN113818354 A CN 113818354A
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- fixed pulley
- dismantled
- wire rope
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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
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a method for quickly dismantling a temporary support under a condition of limited vertical space, which comprises the following steps: s1, selecting the position of a first fixed pulley block, symmetrically installing two first fixed pulley blocks on two sides of the lower part of the finished steel box girder, and respectively installing a fixed fulcrum and a second fixed pulley block on an upper structure of a support to be dismantled and a lower structure of the support to be dismantled below the first fixed pulley blocks on the two sides; s2, respectively installing windlasses at two sides of the lower structure of the bracket to be dismantled, and connecting the first fixed pulley block with the fixed pivot through the movable pulley block; s3, cutting off the connection between the upper structure of the bracket to be removed and the lower structure of the bracket to be removed; s4, removing the lower structure of the support to be removed in blocks to be placed on the ground; and S5, lowering the upper structure of the support to be dismantled to the ground, and then dismantling and tidying. The method has the advantages of simple operation, high overall safety and high construction efficiency, ensures the stress balance of the bracket in the whole process, and reduces the risk of manual high-altitude operation.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for quickly dismantling a temporary support under a condition of limited vertical space.
Background
After the pushing construction of the steel box girder is completed, the problem that the removal operation of a next temporary support with a supporting function is inconvenient after the steel box girder is pushed in place can be solved, and the construction environment with the difficulty in constructing the truck crane with a narrow vertical space is often faced in the process of removing the pushing construction platform below the steel box girder. The conventional dismantling mode is that the platform is dismantled by utilizing a winch to match with a pulley block and then is divided into small blocks to be transferred and dismantled, and a large amount of overhead operation is needed during dismantling because a plurality of small components and equipment on the upper structure of the temporary support are arranged, so that the construction risk is high, and the dismantling time is long. The thin disassembly of the component is not beneficial to the turnover utilization of materials.
Chinese patent document CN111188280A describes a cast-in-place box girder steel pipe support dismantling device and a dismantling method, but the method aims at the cast-in-place box girder, and needs to be improved because the supports to be erected are different, the structure is different, and the installation and the dismantling are different.
Disclosure of Invention
The invention provides a method for quickly dismantling a temporary support under the condition of limited vertical space, which solves the problems that a steel box girder support is difficult to dismantle in the limited space, the construction efficiency is low and the operation is troublesome.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for quickly dismantling a temporary support under the condition of limited vertical space comprises the following steps:
s1, selecting the position of a first fixed pulley block, symmetrically installing two first fixed pulley blocks on two sides of the lower part of the finished steel box girder, and respectively installing a fixed fulcrum and a second fixed pulley block on an upper structure of a support to be dismantled and a lower structure of the support to be dismantled below the first fixed pulley blocks on the two sides;
s2, respectively installing winches on two sides of the lower structure of the support to be dismantled, sequentially and respectively winding first steel wire ropes on the winches on a second fixed pulley block and a first fixed pulley block, and connecting the first fixed pulley block with a fixed pivot through a movable pulley block;
s3, cutting off the connection between the upper structure of the bracket to be removed and the lower structure of the bracket to be removed;
s4, removing the lower structure of the support to be removed in blocks to be placed on the ground;
and S5, lowering the upper structure of the support to be dismantled to the ground, and then dismantling and tidying.
In a preferred embodiment, in S2, the hoist is anchored to the ground through an anchor pile, and one side of the hoist is weighted.
In a preferable scheme, in S2, the first wire rope is wound in from the first fixed pulley block and wound out through the movable pulley block, an end of the first wire rope is fixed to the first fixed pulley block, and a lower portion of the movable pulley block is connected to the two fixed supporting points on the same side through the second wire rope.
In a preferred embodiment, the S2 further includes the following steps:
s21, mounting fourth fixed pulley blocks on two sides of the middle position of the upper structure of the bracket to be dismantled, winding a third steel wire rope at the bottom of each fourth fixed pulley block, and fixing two ends of each third steel wire rope with the movable pulley blocks on two sides;
and S22, adjusting the length of the third steel wire rope to ensure that the third steel wire rope is not contacted with the bottom of the fourth fixed pulley.
In the preferable scheme, after S22, the winch is started to temporarily fix the upper structure of the support to be dismantled, so that the stress of the steel wire rope is ensured.
In a preferred embodiment, in S4, the to-be-removed rack substructure is sequentially removed from high to low by using a truck crane, and a base below the to-be-removed rack substructure is reserved.
In the preferred scheme, after the lower part structure of the bracket to be dismantled is completely dismantled, the state of the upper part structure of the bracket to be dismantled is checked firstly, and the upper part structure of the bracket to be dismantled is ensured to be stable and shake-free and then the winch is started to descend onto the base.
In the preferred scheme, the synchronous work of the two winches is ensured, and the uneven stress of the hoisting points on the two sides is avoided.
In the preferred scheme, whether each connection point is firm or not is checked, and the winch is finely adjusted to ensure that the second steel wire rope and the first steel wire rope are stressed at the same time.
In the preferred scheme, the height of the fourth fixed pulley is adjusted to ensure that the second steel wire rope is in a good state, and meanwhile, the third steel wire rope is in full contact with the bottom of the fourth fixed pulley.
The invention has the beneficial effects that: through earlier the temporary support superstructure, including operation platform, top pushing equipment etc. volve in midair, then demolish temporary support substructure, including steel pipe tie etc. demolish from up down to improve holistic efficiency of construction by a wide margin to temporary support overall structure, and the security is high.
1. The invention reduces the overhead operation, ensures that most of the dismantling and decomposing work can be completed on the ground, ensures the whole dismantling operation to be safe and quick, and improves the integral construction efficiency.
2. The temporary support structure dismantled by the invention is relatively complete, the support can be conveniently used for the second time, the cost is effectively controlled, the temporary support structure can be repeatedly used for many times, and the economical efficiency is good.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a first exploded view of the present invention;
FIG. 2 is a second exploded view of the present invention;
FIG. 3 is a third schematic illustration of the disassembly of the present invention;
FIG. 4 is a fourth schematic illustration of the disassembly of the present invention;
FIG. 5 is a schematic view of the upper structural portion of the stand to be dismantled of the present invention being secured under force;
fig. 6 is a schematic view of the overall structure of the fourth crown block assembly of the present invention.
In the figure: the finished steel box girder 1; the upper structure 2 of the bracket to be dismantled; the lower structure 3 of the support to be dismantled; a hoist 4; a first fixed pulley block 5; a movable pulley block 6; a first wire rope 7; a beam pier 8; a fourth crown block 9; a fixed bracket 901; a roller 902; a threaded rod 903; a rotating shaft 904; a limiting round table 905; a driver chuck 906; a second crown block 10; a third crown block 11; a ground surface 12; a cushion block 13; a fixed fulcrum 14; a second wire rope 15; a third wire rope 16; a base 17.
Detailed Description
As shown in fig. 1 to 6, a method for quickly removing a temporary support under a condition of limited vertical space includes the following steps:
s1, selecting the positions of the first fixed pulley blocks 5, symmetrically installing two first fixed pulley blocks 5 on two sides of the lower part of the finished steel box girder 1, and respectively installing a fixed fulcrum 14 and a second fixed pulley block 10 on the upper structure 2 and the lower structure 3 of the bracket to be dismantled below the first fixed pulley blocks 5 on the two sides; the first fixed pulley block is arranged at the web and the partition plate of the steel box girder 1, so that the steel plate at the bottom of the steel box girder 1 cannot generate stress deformation, the first fixed pulley block 5 is fixed in a welding mode, one side of the finished steel box girder 1 is stably supported by the bridge pier 8, the whole state is stable, and the structure is stable, so that the whole welding seam is ensured to be uniform, the connection is firm, and the stress is sufficient.
S2, installing winches 4 on two sides of the lower structure 3 of the support to be dismantled respectively, winding first steel wire ropes 7 on the winches 4 on a second fixed pulley block 10 and a first fixed pulley block 5 in sequence respectively, and connecting the first fixed pulley block 5 with a fixed pivot 14 through a movable pulley block 6; with the structure, the winch 4 is used as a main driving and stopping unit, the whole weight of the upper structure 2 of the bracket to be dismantled is borne through traction force, the movable pulley block 6 ensures the whole labor saving, and the use is more convenient.
S3, cutting off the connection between the upper structure 2 of the bracket to be removed and the lower structure 3 of the bracket to be removed; by detaching the bolts and fasteners at the joints, the upper structure 2 of the support to be dismantled and the lower structure 3 of the support to be dismantled are separated in preparation for subsequent dismantling.
S4, removing the lower part structure 3 of the support to be removed in blocks to be placed on the ground; after the support lower structure 3 is dismantled in blocks, the parts are dismantled on the ground, the whole operation is convenient, and the construction is safe.
And S5, lowering the upper structure 2 of the support to be dismantled to the ground, and then dismantling and tidying. By the structure, repeated use for many times is ensured, and the operation is simple and efficient.
In the preferred embodiment, in S2, the hoist 4 is anchored to the ground 12 by an anchor pile, and the weight is applied to one side of the hoist 4. The one side far away from the fixed pivot 14 is pressed, so that the structure ensures that the winch 4 and the ground 12 are fixed firmly, the stability in working is ensured, the first steel wire rope is driven to be smoother and more sensitive, and the overall safety is better.
In a preferable scheme, in S2, the first wire rope 7 is wound in from the first fixed pulley block 5 and is wound out through the movable pulley block 6, an end of the first wire rope 7 is fixed on the first fixed pulley block 5, and a lower portion of the movable pulley block 6 is connected with the two fixed supporting points 14 on the same side through the second wire rope 15. By the structure, the movable pulley block 6 is labor-saving for the winch 4, and meanwhile, the second steel wire rope 15 is connected with the two fixed supporting points 14, so that the state of the upper structure 2 of the bracket to be dismantled is more stable under the action of multi-point stress.
In a preferred embodiment, the S2 further includes the following steps:
s21, mounting fourth fixed pulley blocks 9 on two sides of the middle position of the upper structure 2 of the bracket to be dismantled, winding third steel wire ropes 16 at the bottoms of the fourth fixed pulley blocks 9, and fixing two ends of each third steel wire rope 16 with the movable pulley blocks 6 on two sides; the fourth fixed pulley block 9 comprises a fixed support 901, a threaded rod 903 penetrates through the fixed support 901, a limiting circular truncated cone 905 is arranged on the threaded rod 903 close to the inner side of the fixed support 901, a driving chuck 906 is arranged on the threaded rod 903 close to the outer side of the fixed support 901, the driving chuck 906 is fixedly connected with the threaded rod 903, the driving chuck 906 plays a role in limiting the threaded rod 903, a rotating shaft 904 penetrates through the upper portion of the fixed support 901, and a roller 902 is sleeved on the rotating shaft 904. The third steel wire rope 16 passes through the position-limiting round table 905 and the roller 902.
And S22, adjusting the length of the third steel wire rope 16 to ensure that the third steel wire rope 16 is not contacted with the bottom of the fourth fixed pulley 9.
In the preferred scheme, after S22, the winch 4 is started to temporarily fix the upper structure 2 of the support to be dismantled, so that the stress of the steel wire rope is ensured. This arrangement allows the hoist 4 to provide a stable lifting force to the upper frame 2 to be dismantled.
In a preferable embodiment, in S4, the to-be-removed rack substructure 3 is sequentially removed from high to low by using a truck crane, and the base 17 below the to-be-removed rack substructure 3 is retained. With the structure, the operation efficiency is high and the safety is good.
In the preferred scheme, after the lower support structure 3 to be dismantled is completely dismantled, the state of the upper support structure 2 to be dismantled is checked firstly, and the upper support structure 2 to be dismantled is ensured to be stable and shake-free and then the winch 4 is started to descend the upper support structure 2 to be dismantled onto the base 17. From this structure to make the process steady, and base 17 multiple spot supports, base 17 provides the space of operation for waiting to demolish support superstructure 2, has avoided waiting to demolish behind support superstructure 2 laminating ground completely, and the space is limited, inconvenient operation.
In the preferred scheme, the two winches 4 are ensured to work synchronously, and uneven stress on hoisting points on two sides is avoided. By the structure, the upper structure 2 of the bracket to be dismantled is stable in the descending process, and the safety and the high efficiency of construction are ensured.
In the preferred scheme, whether each connection point is firm or not is checked, and the fine adjustment winch 4 ensures that the second steel wire rope 15 and the first steel wire rope 7 are stressed at the same time. From this structure to make first wire rope 7 play the effect that promotes to loose pulley 6 behind the crown block 5, treat through second wire rope 15 simultaneously and demolish support superstructure 2 application of force, guaranteed to treat and demolish the safety of support substructure 3 in the removal process, and whole convenient operation, avoided the long-time risk that is in high altitude construction of personnel, also avoided demolising the human fatigue injury and the psychological burden that the in-process leads to because of the time length in the high altitude.
In a preferable scheme, the height of the fourth fixed pulley 9 is adjusted to ensure that the state of the second steel wire rope 15 is good, and meanwhile, the third steel wire rope 16 is fully contacted with the bottom of the fourth fixed pulley 9. The screwing-in depth of the threaded rod 903 is adjusted through the rotary driving chuck 906, and the structure is characterized in that the second steel wire rope 15 keeps bearing and hoisting the core effect of the process of lifting the upper structure 2 of the bracket to be dismounted, the third steel wire rope 16 can cooperatively connect the movable pulley blocks 6 on two sides by means of the fourth fixed pulley 9, the position of the movable pulley block 6 and the position of the upper structure 2 of the bracket to be dismounted are mutually constrained, the problem that the upper structure 2 of the bracket to be dismounted is likely to shake or be unstable due to the fact that the lower part of the lower steel wire rope is suspended after the lower part of the lower steel wire rope is suddenly dismounted and dismounted is avoided, and when the space is very narrow, the states of the second steel wire rope 15 and the third steel wire rope 16 can be adjusted, the simultaneous stress is kept, the stress distribution is carried out, and the whole body is ensured to be more stable and safe in the lifting process.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. A method for quickly dismantling a temporary support under a condition of limited vertical space is characterized by comprising the following steps: the method comprises the following steps:
s1, selecting the position of a first fixed pulley block (5), symmetrically installing two first fixed pulley blocks (5) on two sides of the lower part of the finished steel box girder (1), and respectively installing a fixed fulcrum (14) and a second fixed pulley block (10) on an upper structure (2) and a lower structure (3) of a bracket to be dismantled below the first fixed pulley blocks (5) on two sides;
s2, installing winches (4) on two sides of a lower structure (3) of the support to be dismantled respectively, sequentially and respectively winding first steel wire ropes (7) on the winches (4) on a second fixed pulley block (10) and a first fixed pulley block (5), and connecting the first fixed pulley block (5) with a fixed fulcrum (14) through a movable pulley block (6);
s3, cutting off the connection between the upper structure (2) of the bracket to be removed and the lower structure (3) of the bracket to be removed;
s4, removing the lower part structure (3) of the bracket to be removed in blocks to be placed on the ground;
and S5, lowering the upper structure (2) of the support to be dismantled to the ground, and then dismantling and arranging.
2. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 1, which is characterized in that: in S2, the hoist (4) is anchored to the ground (12) by anchor piles, and the weight is applied to one side of the hoist (4).
3. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 1, which is characterized in that: in the S2, the first steel wire rope (7) winds in from the first fixed pulley block (5) and winds out from the movable pulley block (6), the end of the first steel wire rope (7) is fixed on the first fixed pulley block (5), and the lower part of the movable pulley block (6) is connected with the two fixed supporting points (14) on the same side through the second steel wire rope (15).
4. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 1, which is characterized in that: the S2 further includes the steps of:
s21, mounting fourth fixed pulley blocks (9) on two sides of the middle position of the upper structure (2) of the bracket to be dismantled respectively, winding a third steel wire rope (16) at the bottom of the fourth fixed pulley blocks (9), and fixing two ends of the third steel wire rope (16) with the movable pulley blocks (6) on two sides respectively;
s22, adjusting the length of the third steel wire rope (16) to ensure that the third steel wire rope (16) is not contacted with the bottom of the fourth fixed pulley (9).
5. The method for quickly dismantling the temporary support under the condition of limited vertical space as claimed in claim 4, wherein: and (S22), starting the winch (4) to temporarily fix the upper structure (2) of the support to be dismantled, and ensuring the stress of the steel wire rope.
6. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 1, which is characterized in that: and in the step S4, the to-be-removed support substructure (3) is sequentially removed from high to low by adopting a truck crane, and a base (17) below the to-be-removed support substructure (3) is reserved.
7. The method for quickly dismantling the temporary support under the condition of limited vertical space as claimed in claim 6, wherein: after the lower support structure (3) to be dismantled is completely dismantled, the state of the upper support structure (2) to be dismantled is checked firstly, and the upper support structure (2) to be dismantled is ensured to be stable and shake-free and then the winch (4) is started to descend the upper support structure (2) to be dismantled onto the base (17).
8. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 7, which is characterized in that: the synchronous work of the two winches (4) is ensured, and the uneven stress of the hoisting points at the two sides is avoided.
9. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 5, which is characterized in that: and (3) checking whether each connection point is firm, and finely adjusting the winch (4) to ensure that the second steel wire rope (15) and the first steel wire rope (7) are stressed simultaneously.
10. The method for quickly dismantling the temporary support under the condition of limited vertical space of claim 9, which is characterized in that: the height of the fourth fixed pulley (9) is adjusted to ensure that the second steel wire rope (15) is in a good state, and meanwhile, the third steel wire rope (16) is in full contact with the bottom of the fourth fixed pulley (9).
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| CN202111155371.3A CN113818354B (en) | 2021-09-29 | 2021-09-29 | Quick dismantling method for temporary support under condition of limited vertical space |
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| CN202111155371.3A CN113818354B (en) | 2021-09-29 | 2021-09-29 | Quick dismantling method for temporary support under condition of limited vertical space |
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| CN113818354B CN113818354B (en) | 2023-05-23 |
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| JP2001115422A (en) * | 1999-10-19 | 2001-04-24 | Hidetoshi Morioka | Dismantling method of supporting for form fixed to concrete slab |
| CN105887694A (en) * | 2016-05-20 | 2016-08-24 | 中交第航务工程局有限公司 | Bridge capping beam bottom formwork demounting device |
| CN106088609A (en) * | 2016-08-29 | 2016-11-09 | 安徽马钢工程技术集团有限公司 | A kind of integral lifting method of large span steel structure vestibule |
| CN108545629A (en) * | 2018-06-26 | 2018-09-18 | 中建二局第二建筑工程有限公司 | Utilize the construction method of tower crane lifting girder truss |
| CN110629674A (en) * | 2019-06-30 | 2019-12-31 | 中国一冶集团有限公司 | Method for dismantling integral falling frame of cast-in-place box girder bailey bracket system in highway construction process |
| CN110745707A (en) * | 2019-11-02 | 2020-02-04 | 中铁七局集团有限公司 | Lifting device for dismantling fabricated support of concrete cast-in-place beam close to railway side |
| CN213951956U (en) * | 2020-09-09 | 2021-08-13 | 中交武汉港湾工程设计研究院有限公司 | Dismantling system for steel box girder bottom pushing equipment |
-
2021
- 2021-09-29 CN CN202111155371.3A patent/CN113818354B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001115422A (en) * | 1999-10-19 | 2001-04-24 | Hidetoshi Morioka | Dismantling method of supporting for form fixed to concrete slab |
| CN105887694A (en) * | 2016-05-20 | 2016-08-24 | 中交第航务工程局有限公司 | Bridge capping beam bottom formwork demounting device |
| CN106088609A (en) * | 2016-08-29 | 2016-11-09 | 安徽马钢工程技术集团有限公司 | A kind of integral lifting method of large span steel structure vestibule |
| CN108545629A (en) * | 2018-06-26 | 2018-09-18 | 中建二局第二建筑工程有限公司 | Utilize the construction method of tower crane lifting girder truss |
| CN110629674A (en) * | 2019-06-30 | 2019-12-31 | 中国一冶集团有限公司 | Method for dismantling integral falling frame of cast-in-place box girder bailey bracket system in highway construction process |
| CN110745707A (en) * | 2019-11-02 | 2020-02-04 | 中铁七局集团有限公司 | Lifting device for dismantling fabricated support of concrete cast-in-place beam close to railway side |
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