CN111139752B - Method for dismantling T-shaped hanging beam - Google Patents
Method for dismantling T-shaped hanging beam Download PDFInfo
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- CN111139752B CN111139752B CN202010054635.5A CN202010054635A CN111139752B CN 111139752 B CN111139752 B CN 111139752B CN 202010054635 A CN202010054635 A CN 202010054635A CN 111139752 B CN111139752 B CN 111139752B
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a method for dismantling a T-shaped hanging beam, which mainly comprises the following steps: firstly, dismantling an auxiliary structure on a bridge deck and a wing wall on a hanging beam; selecting a hoisting scheme, and designing a hoisting hole and a cutting line by combining the hoisting scheme; thirdly, arranging hoisting equipment according to the hoisting point position determined by the hoisting scheme; cutting a panel and a beam body of the T-shaped hanging beam, and installing a balance weight adjusting water tank; and fifthly, conveying the cut T-shaped hanging beam to a specified place through hoisting equipment for crushing. According to the invention, the removal and cleaning of the wing wall and the bridge deck auxiliary structure are carried out, the preparation work is carried out for the next T-shaped hanging beam removal, the T-shaped hanging beams on the water surface and the approach bridge are respectively hoisted by the over-floating crane hoisting and the truck crane hoisting, and the construction time is saved; according to the invention, through the arrangement of the counterweight water tank in the dismantling process, the stress balance of the T-shaped structure in the T-shaped beam dismantling process can be ensured, and further the stress stability of the whole bridge is ensured.
Description
Technical Field
The invention relates to the field of bridge dismantling construction, in particular to a dismantling method of a T-shaped hanging beam.
Background
With the development of bridge construction in China, the bridge which cannot meet the modern traffic requirements or reaches the design age needs to be dismantled; in general, the bridge dismantling project has the advantages of normal traffic guarantee, short construction period, heavy task, high bridge dismantling difficulty and high construction safety requirement.
When the bridge is dismantled, the stability of the structure should be ensured as much as possible in the dismantling process, and the bridge cannot be influenced by overlarge vibration, impact and the like. In the bridge, two ends of a T-shaped hanging beam are connected with a T-shaped structure; during dismantling, the cutting and hoisting modes of the T-shaped hanging beam and the stress balance of the T-shaped hanging arms on the two sides are difficult points in the dismantling process, so that the dismantling method needs to be purposefully proposed for the T-shaped hanging beams at different positions.
Disclosure of Invention
The invention provides a method for dismantling a T-shaped hanging beam, which solves the technical problems of the hoisting mode of the T-shaped hanging beam at different positions, the stress balance of a T-shaped structure in the cutting process, the safety of dismantling and hoisting and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a T-shaped hanging beam dismantling method comprises an edge hanging beam and a middle hanging beam, wherein two ends of the T-shaped hanging beam are connected with a T-shaped structure, and the method comprises the following specific steps:
firstly, removing an auxiliary structure on a bridge floor according to the bridge floor where the T-shaped hanging beam is located and the auxiliary engineering condition of the bridge floor, cutting a bridge wing wall on the T-shaped hanging beam, and transporting the bridge wing wall to a specified place through the bridge floor;
selecting a hoisting scheme according to the position and the formation form of the T-shaped hanging beam, and designing a hoisting hole and a cutting line by combining the hoisting scheme;
thirdly, carrying out construction measurement paying-off and marking on the positions of a hoisting hole and a cutting line on the T-shaped hanging beam on site, arranging hoisting equipment according to a hoisting point position determined by a hoisting scheme, and installing a hoisting rope on the hoisting equipment in the hoisting hole;
cutting a panel and a beam body of the T-shaped hanging beam, installing a counterweight water tank on a T-shaped structure on one side of the cut T-shaped hanging beam, and increasing and decreasing water volume in the counterweight water tank to meet the integral balance of the bridge when the T-shaped hanging beam is cut;
and fifthly, transporting the cut T-shaped hanging beam to a specified place through hoisting equipment for crushing treatment, and then transporting the hoisting equipment to the next hoisting point for hoisting transportation until the T-shaped hanging beam of the whole bridge is completely dismantled.
Further, in the step one, auxiliary projects and the bridge wing walls on the bridge deck are transported through the truck crane, the lifting weight is inversely calculated according to the lifting capacity of the truck crane, the size of the cutting block of the bridge wing walls is determined, and the truck crane selects the lifting safety factor of 2 times.
Further, the concrete anti-collision guardrail and the bridge wing wall are integrally cut by a disc type cutting machine, pre-hanging is carried out before cutting off, and after the lifting rope is tensioned, the connecting position is cut off.
Further, in the second step, the hoisting holes are formed in two ends of the flange plate of the T-shaped hanging beam and/or the bottom end of the web plate.
Further, the hoisting scheme comprises truck crane hoisting, crawler belt hoisting and floating crane hoisting, wherein the truck crane hoisting and the crawler belt hoisting are used for dismantling the T-shaped beam on the approach bridge, and the floating crane hoisting is used for dismantling the T-shaped beam of the main bridge on the water surface.
And further, in the third step, the hoisting point position is designed, the truck crane is arranged on one side of the bridge body on two banks, the floating crane is arranged on the downstream of the water flow, and the dismantling operation is sequentially carried out from the downstream to the upstream.
Further, the integral cutting of the panel and the hanging beam in the fourth step adopts a butterfly cutting machine, wherein a longitudinal cutting line is carried out along the axis position of the two T-shaped hanging beams, the panel is firstly cut off, and the transverse cutting is arranged according to the single weight of the expansion joint between the T-shaped hanging beam and the T-shaped structure and the truck crane or the floating crane.
Furthermore, the counterweight water tank is a cuboid frame which is surrounded to form a cuboid frame without an upper top surface, and the inner side of the cuboid frame is provided with a watertight enclosure.
Further, the counter weight water tank in step four contains the counter weight water tank montant that the interval set up, connects the counter weight water tank montant perpendicularly and the counter weight water tank crossbeam that the interval set up to and set up in the inboard fender that encloses of counter weight water tank montant and counter weight water tank crossbeam.
Furthermore, the counterweight water tank adds water when the T-shaped hanging beam on the same side is removed, and reduces water when the T-shaped hanging beam on the opposite side is removed; the weight of adding water and reducing in the counterweight water tank is the weight of dismantling the T-shaped hanging beam.
The invention has the beneficial effects that:
1) according to the invention, through dismantling and cleaning the wing walls and the bridge deck auxiliary structures, preparation work is made for next T-shaped hanging beam dismantling, and after the wing plates and the auxiliary structures of the bridge are dismantled, the stability of the beam body in the cutting process can be ensured;
2) the T-shaped hanging beams on the water surface and the approach bridge are respectively hoisted through the floating crane hoisting and the truck crane hoisting, multi-span synchronous construction is carried out, and the construction time is saved; the process of dismantling from the downstream to the upstream can ensure the construction of upstream structures, can utilize the space of the site to the maximum extent and reduce the closing time of a channel;
3) according to the invention, through the arrangement of the counterweight water tank in the dismantling process, the stress balance of the T-shaped structure in the T-shaped beam dismantling process can be ensured, and further the stress stability of the whole bridge is ensured; the counterweight water tank is simple in structure and convenient to use, and is easy to construct and operate in a mode of increasing and reducing water quantity;
in addition, the safety of the dismantling process is ensured to the greatest extent through the arrangement of the hoisting holes and the selection of the hoisting ropes in the hoisting process; additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Drawings
FIG. 1 is a plan view of a T-shaped hanging beam demolition process;
FIG. 2 is a schematic view of the connection between a T-shaped hanging beam and a T-shaped structure;
FIG. 3 is a schematic view of a longitudinal cutting line of a T-shaped hanging beam;
FIG. 4 is a schematic view of a floating crane;
fig. 5 is a schematic view of a weighted water tank.
Reference numerals: the method comprises the following steps of 1-T-shaped hanging beam, 11-side hanging beam, 12-middle hanging beam, 13-cutting line, 14-bridge wing wall, 2-T structure, 3-expansion joint, 4-lower support, 5-lifting point position, 6-floating crane equipment, 61-floating crane, 62-flat ship, 7-counterweight water tank, 71-counterweight water tank vertical rod, 72-counterweight water tank cross beam, 73-enclosure and 8-warning ship.
Detailed Description
As shown in fig. 1 and 2, for example, a T-shaped hanging beam 1 of a river-crossing bridge is removed, the bridge is in a form of a continuous T-structure 2+ T-shaped hanging beam 1, a main bridge structure is a four-span T-structure 2 double-width arrangement, 3T-structure 2 main piers are arranged in a single width, a closure section is a T-shaped hanging beam 1, and a lower support 4 comprises a pier, a cushion cap and a pile foundation; each span of the main bridge hanging beam consists of 5T-shaped hanging beams 1, wherein three middle hanging beams 12 and two side hanging beams 11 are arranged, and the middle hanging beams 12 are about 180cm high and 208cm wide; the height of the side hanging beam 11 is about 180cm, the side hanging beam is 104cm close to the inner side wing plate, and the outer side flange is 155 cm; the span of each T-shaped hanging beam 1 is 25m, C40 concrete is adopted, and a diaphragm plate is arranged in parallel with the roadway plate along the transverse direction of the bridge.
With reference to fig. 1 to 5, a method for dismantling a T-shaped hanging beam is further described, which comprises the following specific steps:
step one, lamp posts, communication wires and pipelines on the bridge floor and the auxiliary structure are removed by gas cutting, and steel is transported to a specified place for storage by a flat car and a forklift in time; and movable guardrails are arranged at the adjacent edges of the T-shaped hanging beam 1 to enclose the periphery so as to prevent high-altitude falling safety accidents.
The concrete anti-collision guardrail and the bridge wing wall 14 are integrally cut by a disc type cutting machine, pre-hoisting is carried out before cutting, after a lifting rope is tensioned, the connecting position is finally cut off, auxiliary engineering on the bridge floor and the bridge wing wall 14 are transported by a truck crane, the lifting weight is inversely calculated according to the lifting capacity of the truck crane, the size of the cutting block of the bridge wing wall 14 is determined, and the truck crane selects the lifting safety factor of 2 times.
Step two, the hoisting scheme comprises truck crane hoisting and floating crane hoisting, wherein the truck crane hoisting is used for dismantling the T-shaped hanging beam 1 on the main bridge on the bank, and the floating crane hoisting is used for dismantling the T-shaped hanging beam 1 of the main bridge on the water surface; the T-shaped hanging beam 1 is designed into a simple support structure, and the space of the beam end position is small, so that the floating crane equipment 6 selected when the T-shaped hanging beam 1 is installed in place is shown in figures 1 and 4, the floating crane equipment 6 consists of a floating crane 61 and a flat-plate ship 62, and the flat-plate ship 62 is required for transportation; the top elevation of the T-shaped hanging beam 1 is about +23.0m, the lowest water level in a dry season is considered to be +0.0m, the lifting weight of the T-shaped hanging beam 1 is designed to be 55T, 200T of floating cranes 61 are selected for lifting according to the conditions of the existing large floating cranes 61 in the market and the navigation requirement, and 220T of truck cranes are used for completing dismantling in the approach scheme.
In the construction process, the left frame is firstly removed and then the right frame is removed, and the right frame is used as a construction channel when the left frame is removed; the panel and the T-shaped hanging beam 1 are integrally cut by a butterfly cutting machine, the panel is cut off firstly, then the diaphragm plate is cut off, and each section is provided with 8 hoisting holes; as shown in fig. 3, the cutting is performed along the axial line position of two T-shaped hanging beams 1, the beam body cutting line 13 of the T-shaped hanging beam 1 is the longitudinal central line along the wet joint expansion joint, and 4 holes are drilled at the position 1m from the beam end by a water drill to be used as hoisting holes; the position of the transverse cutting line is set according to the single weight of an expansion joint 3 between the T-shaped hanging beam 1 and the T-shaped structure 2 and the truck crane or the floating crane 61.
Thirdly, carrying out construction measurement paying-off and marking on the positions of a hoisting hole and a cutting line 13 on the T-shaped hanging beam 1 on site, arranging hoisting equipment according to a hoisting point position 5 determined by a hoisting scheme, and installing a hoisting rope on the hoisting equipment in the hoisting hole;
a mid-span T-shaped hanging beam 1 of a main bridge and an approach bridge T-shaped hanging beam 1 are dismantled together; the mid-span T-shaped hanging beam 1 of the main bridge is hoisted by adopting a floating crane 61, the single-span T-shaped hanging beam 1 is dismantled from downstream to upstream in sequence, the hanging beam 11 close to the downstream side is dismantled firstly, and then the beam plates are dismantled in sequence from outside to inside.
The construction process of cutting the T-shaped hanging beam 1 comprises the following steps: construction measurement (paying off a hoisting hole and a cutting line 13 position) → hoisting hole construction → a floating crane 61 or an automobile crane is in place (a lifting appliance is installed through a hoisting hole) → cutting and dismantling the wing plate → transporting a wing plate cutting member to a specified place → cutting a panel and the T-shaped hanging beam 1, and according to the requirement of 'symmetrical and balanced' dismantling, the dismantling deviation of each span of the T-shaped hanging beam 1 is not more than 1T-shaped hanging beam 1.
In the scheme, the steel wire rope is used for mechanical hoisting, the safety coefficient K =6, a 6 × 19 steel wire rope is selected, the diameter is 21.5mm, the tensile strength is 1670Mpa, and the reduction coefficient A = 0.85; the two ends are adopted for hoisting, the maximum hoisting weight of a single steel wire rope is about 26/(6 xsin 60) =5.0t, namely 50KN, and the breaking tension sigma sp of the steel wire rope is 524.00 KN; the allowable maximum pulling force [ F ] of the steel wire rope is obtained by dividing the product of the breaking force Σ sp of the steel wire rope and the reduction coefficient A by the safety factor K, and the obtained [ F ] is 63.6KN and is larger than 50KN, so that the hoisting design construction requirement is met.
Step four, when a panel and a beam body of the T-shaped hanging beam 1 are cut, a counterweight water tank 7 is installed on the T-shaped structure 2 on one side of the cut T-shaped hanging beam 1, and the integral balance of the bridge when the T-shaped hanging beam 1 is cut is met by increasing and decreasing the water volume in the counterweight water tank 7;
as shown in fig. 5, the counterweight water tank 7 is arranged on the T-shaped structure 2, the counterweight water tank 7 is erected by adopting a bowl buckling frame, one counterweight water tank vertical rod 71 is arranged at an interval of 1m, three counterweight water tank cross beams 72 are arranged at the bottom end, the middle part and the top end, integral canvas is adopted as a fence 73 for storing water in the counterweight water tank, the canvas is pulled down for discharging water in the pouring process, and meanwhile, a cut-off ditch is piled up by using mortar on the bridge floor; the counterweight water tank 7 has the size of 10m in length, 8m in width and 1.6m in height and can store 120 cubes of water.
In the dismantling process, when the T-shaped hanging beam 1 is dismantled, in order to ensure the moment balance of the T-shaped structure 2, water is gradually added into the counterweight water tank 7 on the same side, and 0.4m of water is added into the water tank when 1 single-span beam is dismantled until the T-shaped hanging beam 1 is dismantled and the water in the water tank is filled; when the T-shaped hanging beam 1 on the opposite side of the counterweight water tank 7 is dismantled, the counterweight water tank 7 gradually discharges water, the water is discharged by 0.4m when 1 beam is dismantled, the water discharge amount can be properly adjusted according to the field condition until the dismantling is finished, the water in the counterweight water tank 7 is completely discharged, the T-shaped hanging beam 1 is dismantled according to the water discharge amount, and the counterweight water tank 7 is dismantled after the dismantling is finished finally.
And fifthly, transporting the cut T-shaped hanging beam 1 to a designated place through hoisting equipment for crushing treatment, and then transporting the hoisting equipment to the next hoisting point 5 for hoisting transportation until the T-shaped hanging beam 1 of the whole bridge is completely dismantled.
In the embodiment, before each T-shaped hanging beam 1 is hoisted, the contact condition of the block section to be hoisted and other structural parts is carefully checked, the hoisting can be determined, and a commander is reported; lifting the beam body, moving the lifting hook to be right above the lifting beam, and ensuring that the lifting point of the beam body and the center of the T-shaped hanging beam 1 are in the same straight line; the steel wire rope on the upper portion of the lifting hook is connected with the iron wire of the lifting hook to prevent the steel wire rope from shaking and unhooking, the arc-shaped steel plate is arranged at the chamfer of the steel wire rope and the beam body, and the steel wire rope at the chamfer is prevented from being bent and damaged seriously.
In the embodiment, when the midspan T-shaped hanging beam 1 is dismantled, as the floating crane 61 and the flat-bed ship 62 need to temporarily occupy the channel, temporary closure needs to be carried out, the closure time is about 5h each time, relevant procedures need to be handled with a maritime department before closure, and a navigation notice is issued in advance; when the ship is closed, the on-site warning ship 8 is used for warning at the position of 200m upstream and downstream, any ship is forbidden to run into the construction water area, and the floating crane 61 immediately exits from the channel after the operation is finished.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (10)
1. The T-shaped hanging beam dismantling method is characterized in that a T-shaped hanging beam (1) comprises an edge hanging beam (11) and a middle hanging beam (12), two ends of the T-shaped hanging beam (1) are connected with a T-shaped structure (2), and the method comprises the following specific steps:
firstly, removing an auxiliary structure on a bridge floor according to the bridge floor where the T-shaped hanging beam (1) is located and the auxiliary engineering condition of the bridge floor, cutting a wing wall (14) on the T-shaped hanging beam (1), and transporting the wing wall (14) to a designated place through the bridge floor;
secondly, selecting a hoisting scheme according to the position and the formation form of the T-shaped hanging beam (1), and designing a hoisting hole and a cutting line (13) by combining the hoisting scheme;
thirdly, paying off and marking construction measurement on the positions of a hoisting hole and a cutting line (13) on the T-shaped hanging beam (1) on site, arranging hoisting equipment according to a hoisting point position (5) determined by a hoisting scheme, and installing a hoisting rope on the hoisting equipment in the hoisting hole;
cutting a panel and a beam body of the T-shaped hanging beam (1), installing a counterweight water tank (7) on a T-shaped structure (2) on one side of the cut T-shaped hanging beam (1), and increasing and decreasing water volume in the counterweight water tank (7) to meet the integral balance of the bridge when the T-shaped hanging beam (1) is cut;
and fifthly, transporting the cut T-shaped hanging beam (1) to a designated place through a hoisting device for crushing treatment, and then transporting the hoisting device to the next hoisting point (5) for hoisting transportation until the T-shaped hanging beam (1) of the whole bridge is completely dismantled.
2. A method for dismantling a T-shaped suspension beam as claimed in claim 1, wherein in the first step, the auxiliary works on the bridge deck and the wing walls (14) are transported by truck crane, the hoisting weight is inversely calculated according to the hoisting capacity of the truck crane, thereby determining the size of the cutting block of the wing walls (14), and the truck crane is selected with 2 times of hoisting safety factor.
3. A method for dismantling a T-shaped suspension beam as claimed in claim 2, wherein the concrete crash barrier is integrally cut together with the wing wall (14) by a disc cutter, pre-suspended before being cut off, and the connecting position is cut off after the suspension rope is tightened.
4. A method for dismantling a T-shaped suspension beam as claimed in claim 1, wherein in step two, the hoisting holes are provided at both ends of the flange plate and/or the bottom end of the web of the T-shaped suspension beam (1).
5. The method for dismantling the T-shaped suspension girder according to the claim 1 is characterized in that, in the second step, the hoisting scheme comprises a truck crane hoisting, a crawler crane hoisting and a floating crane hoisting, wherein the truck crane hoisting and the crawler crane hoisting are used for dismantling the T-shaped suspension girder of the main bridge on the shore, and the floating crane hoisting is used for dismantling the T-shaped suspension girder (1) of the main bridge on the water surface.
6. A method for dismantling a T-shaped hanging beam as defined in claim 1 or 5, wherein the lifting location (5) in step three is designed such that the mobile crane is parked at one side of the two-shore bridge body, and the floating crane (61) is parked downstream of the water flow, and the dismantling operation is performed sequentially from downstream to upstream.
7. The method for dismantling the T-shaped hanging beam as claimed in claim 1, wherein the panel and the T-shaped hanging beam (1) in the fourth step are integrally cut by a butterfly cutting machine, wherein a longitudinal cutting line is carried out along the axis position of the two T-shaped hanging beams (1), and the panel is firstly cut off; the position of the transverse cutting line is selected according to an expansion joint (3) between the T-shaped hanging beam (1) and the T-shaped structure (2), and the single weight of the truck crane or the floating crane (61) is set.
8. A method for dismantling a T-shaped hanging beam as claimed in claim 1, wherein said counterweight water tank (7) is a rectangular parallelepiped frame without an upper top surface, and a watertight enclosure (73) is provided inside the rectangular parallelepiped frame.
9. The method for dismantling the T-shaped hanging beam as claimed in claim 8, wherein the counterweight water tank (7) comprises counterweight water tank vertical rods (71) arranged at intervals, counterweight water tank cross beams (72) vertically connected with the counterweight water tank vertical rods (71) and arranged at intervals, and a fence (73) arranged at the inner sides of the counterweight water tank vertical rods (71) and the counterweight water tank cross beams (72).
10. A method for dismantling a T-shaped hanging beam as claimed in claim 8 or 9, wherein said counterweight water tank (7) adds water when dismantling the T-shaped hanging beam (1) on the same side, and reduces water when dismantling the T-shaped hanging beam (1) on the opposite side; the weight of water added into the counterweight water tank (7) and reduced is the weight for dismantling the T-shaped hanging beam (1).
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| CN202010054635.5A CN111139752B (en) | 2020-01-17 | 2020-01-17 | Method for dismantling T-shaped hanging beam |
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| CN111139752B true CN111139752B (en) | 2021-05-11 |
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| CN112726434B (en) * | 2020-12-28 | 2022-05-10 | 中铁广州工程局集团桥梁工程有限公司 | Three-span deck reinforced concrete arch bridge dismantling method |
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| JPH09143933A (en) * | 1995-11-17 | 1997-06-03 | Fuji P S:Kk | Method and device for removing floor board |
| CN104131519A (en) * | 2014-08-11 | 2014-11-05 | 浙江兴土桥梁专用装备制造有限公司 | Bridge demolishing construction method and device thereof |
| JP2018087418A (en) * | 2016-11-28 | 2018-06-07 | 宮地エンジニアリング株式会社 | Demolition system and demolition method of concrete slab |
| JP2019002239A (en) * | 2017-06-19 | 2019-01-10 | オリエンタル白石株式会社 | Removal method for floor slab |
| CN110512534A (en) * | 2019-08-27 | 2019-11-29 | 中铁大桥局武汉桥梁特种技术有限公司 | The incisory sewage collection equipment of bridge flange plate |
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2020
- 2020-01-17 CN CN202010054635.5A patent/CN111139752B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09143933A (en) * | 1995-11-17 | 1997-06-03 | Fuji P S:Kk | Method and device for removing floor board |
| CN104131519A (en) * | 2014-08-11 | 2014-11-05 | 浙江兴土桥梁专用装备制造有限公司 | Bridge demolishing construction method and device thereof |
| JP2018087418A (en) * | 2016-11-28 | 2018-06-07 | 宮地エンジニアリング株式会社 | Demolition system and demolition method of concrete slab |
| JP2019002239A (en) * | 2017-06-19 | 2019-01-10 | オリエンタル白石株式会社 | Removal method for floor slab |
| CN110512534A (en) * | 2019-08-27 | 2019-11-29 | 中铁大桥局武汉桥梁特种技术有限公司 | The incisory sewage collection equipment of bridge flange plate |
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