CN114134828A - Method for quickly dismantling upper structure of truss arch bridge - Google Patents
Method for quickly dismantling upper structure of truss arch bridge Download PDFInfo
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- CN114134828A CN114134828A CN202010918496.6A CN202010918496A CN114134828A CN 114134828 A CN114134828 A CN 114134828A CN 202010918496 A CN202010918496 A CN 202010918496A CN 114134828 A CN114134828 A CN 114134828A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims description 42
- 239000010959 steel Substances 0.000 claims description 42
- 229910003460 diamond Inorganic materials 0.000 claims description 12
- 239000010432 diamond Substances 0.000 claims description 12
- 239000000178 monomer Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 238000005452 bending Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
Abstract
The invention relates to the technical field of bridge demolition construction, in particular to a method for quickly demolishing an upper structure of a truss arch bridge, which comprises the following steps: (A) dismantling the bridge deck auxiliary structure comprising a railing and a sidewalk plate; (B) setting a temporary support system (a); (C) dismantling the bridge deck pavement and the micro bent plate; (D) dividing arch pieces, and cutting and separating the arch pieces; (E) and hoisting the arch sheet to a specified position. According to the invention, the construction sequence of the traditional truss arch bridge structure is optimized, and by arranging the temporary support system (a), the situation that the arch sheet is inclined laterally in the process of removing the upper structure of the truss arch bridge is avoided, the stability of the arch sheet in the removal process is ensured, the safety of the construction process is ensured, meanwhile, the construction process is optimized, the construction period is shortened, the construction efficiency is improved, the construction cost is reduced, and the temporary support system can be popularized in the actual engineering.
Description
Technical Field
The invention relates to a method for quickly dismantling an upper structure of a truss arch bridge, and belongs to the technical field of bridge dismantling construction.
Background
The truss arch bridge is an arch bridge formed by a solid-web section in the middle and arch truss pieces on two sides. The truss arch sheets are connected into a whole by a bridge deck system and a transverse connecting system (a transverse strut and a cross brace). The device is characterized in that the solid-web section and the arched truss pieces at the two sides play a role in stressing an arch, and arch legs have horizontal thrust to reduce midspan bending moment; compared with the common rib arch bridge with arch building, the bridge has reasonable stress, can save materials and reduce self weight, and is suitable for occasions with poor foundation.
The truss arch bridge is a light arch bridge developed in the end of the 60 s, and at present, due to the fact that a plurality of truss arch bridges are long in construction years, the overall rigidity, strength and stability of the truss arch bridge are reduced to different degrees after operation for many years, and uncertain factors such as fatigue damage, plastic deformation, local damage and the like of a single component and a connecting part exist. With the rapid development of national economy, the traffic volume is greatly increased, and the passing requirements of people on bridges are higher and higher. Therefore, part of the truss arch bridge needs to be dismantled and rebuilt, and in the dismantling engineering of the truss arch bridge, the dismantling of the main arch ring is critical and needs to be prevented from continuously collapsing in the dismantling process. Under the action of vertical load, the cross section of the main arch ring mainly generates compressive stress, and the generated bending moment is very small relative to that of the equal-span simply supported beam. According to respective stress characteristics, the main arch ring and the equal-span simply supported beam have great difference in structure. The main arch ring can not be taken as a simply supported beam and is lifted by the integral simply support, otherwise, the middle part of the main arch ring is broken after being lifted, and the main arch ring is damaged, so that serious consequences are caused, and quality and safety accidents are caused.
Disclosure of Invention
In order to solve the problems, the invention provides a method for quickly dismantling the upper structure of a truss arch bridge.
The invention is realized by the following technical scheme.
The invention provides a method for quickly dismantling an upper structure of a truss arch bridge, which comprises the following steps:
(A) demolish bridge floor auxiliary structure and include railing and pavement slab: each side rail is removed from two sides to the middle one by one; chiseling the railing base by using an air pick, hoisting by using a crane, and loading and transporting away; the sidewalk cover plate and the pavement layer are directly pried up by a crowbar manually, and the concrete road teeth are crushed and dismantled by an air pick, loaded and transported away;
(B) setting a temporary supporting system: the support type is that a buttress is respectively erected at the positions of 1/4 and 3/4, and 4-8 steel pipe piles are arranged on two sides of each buttress; double-spliced I45I-shaped steel is arranged among the steel pipe piles to be used as transverse connection, double-spliced I25I-shaped steel is arranged below each arch sheet, and a wood support is paved on the double-spliced I25I-shaped steel;
(C) dividing arch pieces, cutting and separating the arch pieces: dividing the existing bridge into a plurality of arch pieces according to the cutting line of the expansion joints and the hinge joints of the existing bridge, and simultaneously determining the hoisting sequence of each arch piece;
(D) demolish bridge floor pavement and little bent plate: the bridge deck pavement layer and the micro bent plate are disassembled in blocks by adopting a diamond track cutting machine; before cutting, the monomer component is punched with 4 holes by a diamond punching machine for lifting the opening, the 4 holes are uniformly distributed at four corners of the component according to the size of the component, and the component is wrapped up and tightened by a high-strength steel wire rope;
(E) hoisting the arch sheet to a specified position: hoisting the arch pieces determined in the step (C) by using a floating crane or a crane according to the hoisting sequence of the arch pieces, selecting a high-strength steel wire rope to firmly bind the solid-web section at the hoisting point of the solid-web section, applying a hoisting force slightly larger than the weight of the solid-web section to the solid-web section by using a floating crane, and then cutting off the main arch ring at the division part of the solid-web section and the lower chord by using an air compressor; and (4) after the solid-web section is dismantled, the lower chord is dismantled, then the arch piece is hoisted to a specified position, and the process is repeated until the complete hoisting of the truss arch bridge is finished.
In the step (A), the removal of the bridge deck auxiliary structure is realized by manually using an air pick and a crowbar to cut or break the railings and the sidewalk plate, and then using a crane and manual loading to transport the railings and the sidewalk plate.
The method for quickly dismantling the upper structure of the truss arch bridge comprises the steps that in the step (B), a temporary supporting system is adopted, wherein the specification of the steel pipe pile is 530 mm in diameter and 630mm in wall thickness, and is 8-10 mm; the transverse connection double-spliced I45I-shaped steel adopts Q235-Q345 steel; the double-spliced I25I-shaped steel is made of Q235-Q345 steel.
The method for quickly dismantling the upper structure of the truss arch bridge comprises the following steps that (D) a diamond track cutting machine is used for paving a bridge deck and dismantling a micro bent plate; the member was punched using a diamond punch.
The method for quickly dismantling the upper structure of the truss arch bridge comprises the step (E) of hoisting the upper structure of the arch bridge by adopting a high-strength steel wire rope.
The invention has the following beneficial effects: through setting up interim support, avoided the arch bridge superstructure to demolish the condition that the arch piece lateral overturn probably appears in-process, guaranteed the stability of demolising in-process arch bridge, ensured the safety of work progress, shortened construction period, improved the efficiency of construction, reduced construction cost, can promote in actual engineering.
Drawings
FIG. 1 is a flow chart of a method for quickly removing the superstructure of a truss arch bridge;
FIG. 2 is a schematic longitudinal section of an arch bridge with temporary supports;
FIG. 3 is a schematic cross-sectional view of an arch bridge with temporary supports;
fig. 4 is a schematic elevation view of the temporary support.
1. Steel pipe piles; 2. double-spliced I45I-shaped steel; 3. double-spliced I25I-shaped steel; 4. a dome sheet.
Detailed Description
For a more complete understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Referring to fig. 1, in an embodiment of the present invention, a method for quickly dismantling a superstructure of a truss arch bridge specifically includes the following steps:
(A) demolish bridge floor auxiliary structure and include railing and pavement slab: each side rail is removed from two sides to the middle one by one; chiseling the railing base by using an air pick, hoisting by using a crane, and loading and transporting away; the sidewalk cover plate and the pavement layer are directly pried up by a crowbar manually, and the concrete road teeth are crushed and dismantled by an air pick, loaded and transported away;
(B) setting a temporary supporting system: the support type is that a buttress is respectively erected at the positions of 1/4 and 3/4, and 4-8 steel pipe piles are arranged on two sides of each buttress; double-spliced I45I-shaped steel is arranged among the steel pipe piles to be used as transverse connection, double-spliced I25I-shaped steel is arranged below each arch sheet, and a wood support is paved on the double-spliced I25I-shaped steel;
(C) dividing arch pieces, cutting and separating the arch pieces: dividing the existing bridge into a plurality of arch pieces according to the cutting line of the expansion joints and the hinge joints of the existing bridge, and simultaneously determining the hoisting sequence of each arch piece;
(D) demolish bridge floor pavement and little bent plate: the bridge deck pavement layer and the micro bent plate are disassembled in blocks by adopting a diamond track cutting machine; before cutting, the monomer component is punched with 4 holes by a diamond punching machine for lifting the opening, the 4 holes are uniformly distributed at four corners of the component according to the size of the component, and the component is wrapped up and tightened by a high-strength steel wire rope;
(E) hoisting the arch sheet to a specified position: hoisting the arch pieces determined in the step (C) by using a floating crane or a crane according to the hoisting sequence of the arch pieces, selecting a high-strength steel wire rope to firmly bind the solid-web section at the hoisting point of the solid-web section, applying a hoisting force slightly larger than the weight of the solid-web section to the solid-web section by using a floating crane, and then cutting off the main arch ring at the division part of the solid-web section and the lower chord by using an air compressor; and (4) after the solid-web section is dismantled, the lower chord is dismantled, then the arch piece is hoisted to a specified position, and the process is repeated until the complete hoisting of the truss arch bridge is finished.
In the step (A), the removal of the bridge deck auxiliary structure is realized by manually using an air pick and a crowbar to cut or break the railings and the sidewalk plate, and then using a crane and manual loading to transport the railings and the sidewalk plate.
The method for quickly dismantling the upper structure of the truss arch bridge comprises the steps that in the step (B), a temporary supporting system is adopted, wherein the specification of the steel pipe pile is 530 mm in diameter and 630mm in wall thickness, and is 8-10 mm; the transverse connection double-spliced I45I-shaped steel adopts Q235-Q345 steel; the double-spliced I25I-shaped steel is made of Q235-Q345 steel.
The method for quickly dismantling the upper structure of the truss arch bridge comprises the following steps that (D) a diamond track cutting machine is used for paving a bridge deck and dismantling a micro bent plate; the member was punched using a diamond punch.
The method for quickly dismantling the upper structure of the truss arch bridge comprises the step (E) of hoisting the upper structure of the arch bridge by adopting a high-strength steel wire rope.
The invention is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (5)
1. A method for rapidly dismantling the superstructure of a truss arch bridge is characterized by comprising the following steps:
(A) demolish bridge floor auxiliary structure and include railing and pavement slab: each side rail is removed from two sides to the middle one by one; chiseling the railing base by using an air pick, hoisting by using a crane, and loading and transporting away; the sidewalk cover plate and the pavement layer are directly pried up by a crowbar manually, and the concrete road teeth are crushed and dismantled by an air pick, loaded and transported away;
(B) setting a temporary support system (a): the support type bridges 1/4 and 3/4 are respectively provided with a buttress, and 4-8 steel pipe piles (1) are arranged on two sides of each buttress; double-spliced I45I-shaped steel (2) is arranged among the steel pipe piles to be used as transverse connection, double-spliced I25I-shaped steel (3) is arranged below each arch sheet, and a wood support is paved on the double-spliced I25I-shaped steel;
(C) dividing arch pieces, cutting and separating the arch pieces: dividing the existing bridge into a plurality of arch pieces according to the cutting line of the expansion joints and the hinge joints of the existing bridge, and simultaneously determining the hoisting sequence of each arch piece;
(D) demolish bridge floor pavement and little bent plate: the bridge deck pavement layer and the micro bent plate are disassembled in blocks by adopting a diamond track cutting machine; before cutting, the monomer component is punched with 4 holes by a diamond punching machine for lifting the opening, the 4 holes are uniformly distributed at four corners of the component according to the size of the component, and the component is wrapped up and tightened by a high-strength steel wire rope;
(E) hoisting the arch sheet to a specified position: hoisting the arch pieces determined in the step (C) by using a floating crane or a crane according to the hoisting sequence of the arch pieces, selecting a high-strength steel wire rope to firmly bind the solid-web section at the hoisting point of the solid-web section, applying a hoisting force slightly larger than the weight of the solid-web section to the solid-web section by using a floating crane, and then cutting off the main arch ring at the division part of the solid-web section and the lower chord by using an air compressor; and (4) after the solid-web section is dismantled, the lower chord is dismantled, then the arch piece is hoisted to a specified position, and the process is repeated until the complete hoisting of the truss arch bridge is finished.
2. The method for rapidly dismantling the superstructure of the truss arch bridge according to claim 1, wherein the dismantling of the deck auxiliary structure in the step (A) is manually to use an air pick and a crow bar to divide or break the railings and the sidewalk plate, and then to use a crane and a manual truck to transport away.
3. The method for rapidly dismantling the superstructure of a truss arch bridge as recited in claim 1, wherein the temporary support system (a) in the step (B) is adopted, wherein the steel pipe piles (1) are used with the diameter of 530 mm and the wall thickness of 630mm of 8-10 mm; the transverse connection double I45I-shaped steel (2) adopts Q235-Q345 steel; the double-spliced I25I-shaped steel (3) is made of Q235-Q345 steel.
4. The method for rapidly demolishing an upper structure of a truss arch bridge according to claim 1, wherein the step (D) uses a diamond track cutter for deck pavement and demolition of the microbends; the member was punched using a diamond punch.
5. A method for quickly dismantling the superstructure of a truss arch bridge as claimed in claim 1, wherein step (E) uses a high tensile steel cable to hoist the superstructure of the truss arch bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010918496.6A CN114134828A (en) | 2020-09-03 | 2020-09-03 | Method for quickly dismantling upper structure of truss arch bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010918496.6A CN114134828A (en) | 2020-09-03 | 2020-09-03 | Method for quickly dismantling upper structure of truss arch bridge |
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| CN114134828A true CN114134828A (en) | 2022-03-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960479A (en) * | 2022-04-24 | 2022-08-30 | 广西北投交通养护科技集团有限公司 | Method for dismantling arch-connected bridge based on shallow-buried foundation critical cross-sectional area overturning destruction |
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2020
- 2020-09-03 CN CN202010918496.6A patent/CN114134828A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960479A (en) * | 2022-04-24 | 2022-08-30 | 广西北投交通养护科技集团有限公司 | Method for dismantling arch-connected bridge based on shallow-buried foundation critical cross-sectional area overturning destruction |
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Application publication date: 20220304 |