CN113818354B - Quick dismantling method for temporary support under condition of limited vertical space - Google Patents
Quick dismantling method for temporary support under condition of limited vertical space Download PDFInfo
- Publication number
- CN113818354B CN113818354B CN202111155371.3A CN202111155371A CN113818354B CN 113818354 B CN113818354 B CN 113818354B CN 202111155371 A CN202111155371 A CN 202111155371A CN 113818354 B CN113818354 B CN 113818354B
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- bracket
- fixed pulley
- wire rope
- steel wire
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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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- Architecture (AREA)
- 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 positions of first fixed pulley blocks, symmetrically installing two first fixed pulley blocks on two sides of the lower part of a finished steel box girder, and respectively installing a fixed fulcrum and a second fixed pulley block on an upper structure of a bracket to be dismantled and a lower structure of the bracket to be dismantled below the first fixed pulley blocks on two sides; s2, installing windlass on two sides of the lower structure of the bracket to be dismantled respectively, 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 bracket to be removed in a blocking manner until the lower structure is placed on the ground; s5, the upper structure of the bracket to be removed is lowered to the ground, and then removed and tidied. The invention has simple operation, high overall safety and high construction efficiency, ensures that the stress of the bracket is balanced 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 the condition of limited vertical space.
Background
After the pushing construction of the steel box girder is completed, the problem that the lower temporary support with a supporting function is inconvenient to disassemble after the steel box girder is pushed in place exists, and a construction environment with difficult operation of the automobile crane with a narrow vertical construction space is often faced in the process of disassembling the pushing construction platform below the steel box girder. The conventional dismantling mode is to use a winch to match with a pulley block to disassemble the platform, and then divide the platform into small blocks for dismantling, and as the upper structure of the temporary support is small, a large amount of overhead work is required during dismantling, the construction risk is large, and the dismantling time is long. Too fine a component resolution is not beneficial to the turnover utilization of materials.
The Chinese patent document CN111188280A describes a cast-in-situ box girder steel pipe bracket dismantling device and a dismantling method, but the method aims at the cast-in-situ box girder, and the brackets required to be erected are different, the structures are different, and the installation and the dismantling are also different, so that improvement is required.
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 of difficult dismantling of a steel box girder support in a limited space, low construction efficiency and troublesome operation.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for quickly dismantling a temporary support under a condition of limited vertical space comprises the following steps:
s1, selecting the positions of first fixed pulley blocks, symmetrically installing two first fixed pulley blocks on two sides of the lower part of a finished steel box girder, and respectively installing a fixed fulcrum and a second fixed pulley block on an upper structure of a bracket to be dismantled and a lower structure of the bracket to be dismantled below the first fixed pulley blocks on two sides;
s2, installing winches on two sides of a lower structure of the bracket to be dismantled respectively, and sequentially and respectively winding a first steel wire rope on the winches on a second fixed pulley block and a first fixed pulley block, wherein the first fixed pulley block is connected with a fixed fulcrum 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 bracket to be removed in a blocking manner until the lower structure is placed on the ground;
s5, the upper structure of the bracket to be removed is lowered to the ground, and then removed and tidied.
In a preferred embodiment, in S2, the hoist is anchored to the ground by the anchor pile, and the weight is applied to one side of the hoist.
In the preferred scheme, in S2, first wire rope winds into from first fixed assembly pulley and winds out through movable assembly pulley, and on the fixed first fixed assembly pulley of end of first wire rope, the lower part of movable assembly pulley was connected with two fixed fulcra of homonymy through second wire rope.
In a preferred embodiment, the step S2 further includes the following steps:
s21, respectively installing 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 the fourth fixed pulley block, and respectively fixing two ends of the third steel wire rope with movable pulley blocks on two sides;
s22, adjusting the length of the third steel wire rope to ensure that the bottoms of the third steel wire rope and the fourth fixed pulley are not contacted.
In the preferred scheme, after S22, start the hoist engine and wait to demolish the support upper structure and fix temporarily, guarantee wire rope atress.
In the preferred scheme, in S4, the lower structure of the bracket to be removed is removed sequentially from high to low by using the truck crane, and the base below the lower structure of the bracket to be removed is reserved.
In the preferred scheme, after the lower structure of the bracket to be removed is completely removed, the state of the upper structure of the bracket to be removed is checked, so that the upper structure of the bracket to be removed is ensured to be stable without shaking, and then a winch is started to descend the upper structure of the bracket to be removed onto the base.
In the preferred scheme, the two windlass are ensured to work synchronously, and uneven stress of hanging points at two sides is avoided.
In the preferred scheme, whether each connecting point is firm is checked, and the fine adjustment winch ensures that the second steel wire rope and the first steel wire rope are stressed simultaneously.
In the preferred scheme, the height of the fourth fixed pulley is adjusted, so that the second steel wire rope is in good state, and meanwhile, the bottom of the third steel wire rope is fully contacted with the bottom of the fourth fixed pulley.
The beneficial effects of the invention are as follows: through suspending temporary support superstructure in midair including operation platform, pushing equipment etc. earlier, then demolish temporary support substructure, including steel pipe parallel connection etc. to temporary support overall structure follow down up demolish can improve holistic efficiency of construction by a wide margin, and the security is high.
1. The invention reduces the overhead operation, so that most of dismantling and decomposing work can be completed on the ground, the whole dismantling operation is safe and quick, and the integral construction efficiency is improved.
2. The removed temporary support has a relatively complete structure, is convenient for secondary use of the support, effectively controls the cost, is repeatedly used for multiple times, and has good economy.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of the present invention in a disassembled state;
FIG. 2 is a second schematic view of the present invention;
FIG. 3 is a schematic view of a third embodiment of the present invention;
FIG. 4 is a schematic drawing of a disassembly of the present invention;
FIG. 5 is a schematic view showing the upper force fixing of the upper structure of the bracket to be removed according to the present invention;
fig. 6 is a schematic diagram of the overall structure of the fourth fixed pulley block of the invention.
In the figure: a finished steel box girder 1; the support superstructure 2 is to be dismantled; the lower structure 3 of the bracket is to be dismantled; a hoist 4; a first fixed pulley block 5; a movable pulley block 6; a first wire rope 7; beam piers 8; a fourth fixed pulley block 9; a fixing bracket 901; a roller 902; a threaded rod 903; a rotation shaft 904; limit round table 905; a drive chuck 906; a second fixed pulley block 10; a third fixed pulley block 11; a ground 12; a pad 13; a fixed fulcrum 14; a second wire rope 15; a third wire rope 16; a base 17.
Detailed Description
As shown in fig. 1-6, a method for quickly dismantling a temporary support under a condition of limited vertical space comprises the following steps:
s1, selecting the positions of first fixed pulley blocks 5, symmetrically installing two first fixed pulley blocks 5 on two sides of the lower part of a 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; the first fixed pulley block is arranged at the web plate 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 be deformed under stress, 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, and the whole state is stable.
S2, installing winches 4 on two sides of a lower structure 3 of a bracket to be dismantled respectively, and sequentially winding a first steel wire rope 7 on the winches 4 on a second fixed pulley block 10 and a first fixed pulley block 5 respectively, wherein the first fixed pulley block 5 is connected with a fixed fulcrum 14 through a movable pulley block 6; the structure is that the hoist 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 by traction, and the movable pulley block 6 ensures the whole labor saving and is more convenient to use.
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; the upper structure 2 of the bracket to be dismantled and the lower structure 3 of the bracket to be dismantled are separated by disassembling bolts and fasteners at the joint, so as to prepare for subsequent dismantling.
S4, removing the lower structure 3 of the bracket to be removed in a blocking manner until the lower structure is placed on the ground; the lower structure 3 of the dismantling support is disassembled in blocks, and then smaller parts are disassembled on the ground, so that the whole operation is convenient, and the construction is safe.
S5, the upper structure 2 of the bracket to be removed is removed and arranged after being lowered to the ground. With the structure, repeated use is ensured, and the operation is simple and efficient.
In a preferred embodiment, in S2, the hoist 4 is anchored to the ground 12 by an anchor pile, and the hoist 4 is weighted on one side. The weight is applied to the side far away from the fixed fulcrum 14, so that the winch 4 and the ground 12 are firmly fixed, the stability of the working process is ensured, and the driving of the first steel wire rope is smoother and more sensitive, and the overall safety is better.
In the preferred scheme, in the step S2, the first steel wire rope 7 is wound in from the first fixed pulley block 5 and is wound out through the movable pulley block 6, the end head 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 two fixed fulcra 14 on the same side through the second steel wire rope 15. The structure is so that 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 stable due to multi-point stress.
In a preferred embodiment, the step S2 further includes the following steps:
s21, respectively installing a fourth fixed pulley block 9 on two sides of the middle position of the upper structure 2 of the bracket to be dismantled, winding a third steel wire rope 16 at the bottom of the fourth fixed pulley block 9, and respectively fixing two ends of the third steel wire rope 16 with the movable pulley blocks 6 on two sides; the fourth fixed pulley group 9 includes the fixed bolster 901, wears to be equipped with the threaded rod 903 on the fixed bolster 901, and the threaded rod 903 is close to the fixed bolster 901 inboard and is equipped with spacing round platform 905, and the threaded rod 903 is close to the fixed bolster 901 outside and is equipped with drive chuck 906, drive chuck 906 and threaded rod 903 fixed connection, and drive chuck 906 plays the effect to the spacing of threaded rod 903, and the pivot 904 is worn to be equipped with on fixed bolster 901 upper portion, and the cover is equipped with gyro wheel 902 on the pivot 904. The third wire rope 16 is threaded between the limit round table 905 and the roller 902.
And S22, adjusting the length of the third steel wire rope 16 to ensure that the bottoms of the third steel wire rope 16 and the fourth fixed pulley 9 are not contacted.
In the preferred scheme, after S22, start hoist engine 4 and wait to demolish support superstructure 2 and fix temporarily, guarantee wire rope atress. This structure allows the hoist 4 to provide a stable lifting force for the bracket superstructure 2 to be removed.
In the preferred scheme, in S4, the lower structure 3 of the bracket to be removed is removed sequentially from high to low by using the crane, and the base 17 below the lower structure 3 of the bracket to be removed is reserved. With the structure, the operation efficiency is high, and the safety is good.
In the preferred scheme, after the bracket lower structure 3 to be removed is completely removed, the state of the bracket upper structure 2 to be removed is checked, so that the bracket upper structure 2 to be removed is ensured to be stable without shaking, and then the winch 4 is started to descend the bracket upper structure 2 to be removed onto the base 17. With this structure, so that the process is stable, and the base 17 is supported at multiple points, the base 17 provides an operation space for the upper structure 2 of the bracket to be removed, and the space is limited after the upper structure 2 of the bracket to be removed is completely attached to the ground, so that the operation is inconvenient.
In the preferred scheme, the two windlass 4 are ensured to work synchronously, and uneven stress of hanging points at two sides is avoided. The structure ensures that the upper structure 2 of the bracket to be dismantled is stable in the descending process, and ensures the safety and the high efficiency of construction.
In a preferred solution, it is checked whether the connection points are firm or not and the fine tuning winch 4 ensures that the second wire rope 15 and the first wire rope 7 are stressed simultaneously. From this structure to make first wire rope 7 play the effect that promotes to running block 6 behind the fixed pulley group 5, treat simultaneously through second wire rope 15 and demolish support superstructure 2 application of force, guaranteed to treat demolish support substructure 3 safety at demolishing the in-process, and whole convenient operation has avoided personnel to be in the risk of high altitude construction for a long time, also avoids human fatigue injury and psychological burden because of long time leads to at the high altitude demolishing the in-process.
In the preferred scheme, the height of the fourth fixed pulley 9 is adjusted, so that the second steel wire rope 15 is in a good state, and meanwhile, the bottom of the third steel wire rope 16 and the bottom of the fourth fixed pulley 9 are fully contacted. The screw-in depth of the threaded rod 903 is adjusted through the rotation driving chuck 906, so that the second steel wire rope 15 keeps the core function of bearing and hoisting the upper structure 2 of the bracket to be dismantled, 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 blocks 6 and the position of the upper structure 2 of the bracket to be dismantled are mutually restrained, the problem that the upper structure 2 of the bracket to be dismantled possibly has shaking or instability due to suspension of the lower part after the lower structure 3 of the bracket is suddenly dismantled is avoided, and when the situation of extremely narrow space is faced, 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 distribution of the stress is carried out, and the stability and safety of the whole in the hoisting process are ensured.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (6)
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 positions of first fixed pulley blocks (5), symmetrically installing two first fixed pulley blocks (5) on two sides of the lower part of a finished steel box girder (1), and respectively installing a fixed fulcrum (14) and a second fixed pulley block (10) on an upper structure (2) of a bracket to be dismantled and a lower structure (3) of the 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 a bracket to be dismantled respectively, and sequentially winding a first steel wire rope (7) on the winches (4) on a second fixed pulley block (10) and a first fixed pulley block (5) respectively, wherein the first fixed pulley block (5) is connected 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 structure (3) of the bracket to be removed in a blocking manner until the lower structure is placed on the ground;
s5, lowering the upper structure (2) of the bracket to be removed to the ground, and removing and arranging the upper structure;
in the step S2, the winch (4) is anchored on the ground (12) through an anchor pile, and one side of the winch (4) is weighted;
in the S2, a first steel wire rope (7) is wound in from a first fixed pulley block (5) and is wound out through a movable pulley block (6), the end head 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 two fixed fulcra (14) on the same side through a second steel wire rope (15);
the step S2 further comprises the following steps:
s21, respectively installing fourth fixed pulley blocks (9) on two sides of the middle position of the upper structure (2) of the bracket to be dismantled, winding a third steel wire rope (16) at the bottom of the fourth fixed pulley blocks (9), and respectively fixing two ends of the third steel wire rope (16) with the movable pulley blocks (6) on two sides;
s22, adjusting the length of the third steel wire rope (16) to ensure that the bottoms of the third steel wire rope (16) and the fourth fixed pulley (9) are not contacted;
the height of the fourth fixed pulley (9) is adjusted, so that the second steel wire rope (15) is in good condition, and meanwhile, the bottom of the third steel wire rope (16) is fully contacted with the bottom of the fourth fixed pulley (9).
2. The method for quickly dismantling the temporary support under the condition of limited vertical space according to claim 1, which is characterized in that: and after S22, starting a winch (4) to temporarily fix the upper structure (2) of the bracket to be dismantled, so as to ensure the stress of the steel wire rope.
3. The method for quickly dismantling the temporary support under the condition of limited vertical space according to claim 1, which is characterized in that: in the S4, the lower structure (3) of the bracket to be removed is sequentially removed from high to low by adopting an automobile crane, and a base (17) below the lower structure (3) of the bracket to be removed is reserved.
4. The method for quickly dismantling the temporary support under the condition of limited vertical space according to claim 3, which is characterized in that: after the bracket lower structure (3) to be dismantled is completely dismantled, the state of the bracket upper structure (2) to be dismantled is checked, and the winch (4) is started to descend the bracket upper structure (2) to be dismantled onto the base (17) after the bracket upper structure (2) to be dismantled is ensured to be stable and free of shaking.
5. The method for quickly dismantling the temporary support under the condition of limited vertical space according to claim 4, which is characterized in that: the synchronous work of the two windlass (4) is ensured, and uneven stress of hanging points at two sides is avoided.
6. The method for quickly dismantling the temporary support under the condition of limited vertical space according to claim 2, which is characterized in that: checking whether each connecting point is firm, and the fine adjustment winch (4) ensures that the second steel wire rope (15) and the first steel wire rope (7) are stressed simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN113818354A CN113818354A (en) | 2021-12-21 |
| CN113818354B true CN113818354B (en) | 2023-05-23 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (5)
| 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 |
| 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 |
| CN108545629B (en) * | 2018-06-26 | 2019-08-16 | 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 |
| CN110745707B (en) * | 2019-11-02 | 2020-10-09 | 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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2021
- 2021-09-29 CN CN202111155371.3A patent/CN113818354B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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