CN111778883B - Non-unbalance-load quick dismantling method for multi-span concrete rigid frame arch bridge - Google Patents
Non-unbalance-load quick dismantling method for multi-span concrete rigid frame arch bridge Download PDFInfo
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- CN111778883B CN111778883B CN202010686392.7A CN202010686392A CN111778883B CN 111778883 B CN111778883 B CN 111778883B CN 202010686392 A CN202010686392 A CN 202010686392A CN 111778883 B CN111778883 B CN 111778883B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
Abstract
The invention discloses a non-unbalance loading fast demolition method of a multi-span concrete rigid frame arch bridge, which comprises the steps of erecting an old bridge demolition construction trestle platform, erecting an old bridge arch rib support frame, dismantling a bridge deck attachment, dismantling a bridge deck, dismantling a transverse beam, dismantling a main arch rib, dismantling a pier and dismantling a bridge abutment, and the non-unbalance loading fast demolition method of the multi-span concrete rigid frame arch bridge eliminates unbalanced unbalance loading of a middle pier by erecting the arch rib support frame, sets a scientific demolition sequence, uses reasonable demolition equipment, avoids the defects of large mechanical crushing or blasting, integral collapse and secondary cleaning, large construction potential safety hazard, heavy demolition noise and dust, heavy secondary cleaning pollution and the like in the traditional demolition method, enables demolition to be carried out safely, efficiently and in an environment-friendly way, conforms to a green construction concept, realizes the purposes of reducing noise, pollution and reducing the disturbance environment around, the construction technology for dismantling the old bridge is enriched, and the method has better reference significance for similar projects.
Description
Technical Field
The invention relates to the field of bridge demolition equipment, in particular to an unbalance-load-free quick demolition method for a multi-span concrete rigid frame arch bridge.
Background
Since the 70 s, a large number of multi-span rigid frame arch bridges have been built all over the country. With the lapse of time, the traffic volume and the vehicle load grade are rapidly improved, the early-built rigid frame arch bridge cannot meet the requirements of modern traffic, and many bridges have diseases such as cracks with different degrees, damage of transverse connecting beams and the like after years, are seriously damaged and need to be dismantled and rebuilt.
In the traditional rigid frame arch bridge structure dismantling process, a mechanical dismantling method is adopted as a common rigid frame arch bridge dismantling method, large-scale mechanical blasting is adopted for removing and crushing bridge deck dismantling, chipping and then cutting are adopted for removing arch ribs, a blasting loosening combined crushing dismantling method is adopted for removing foundations, a blasting method is adopted, blasting is carried out to enable the whole arch bridge to collapse, and then the arch bridge is broken and cleaned in a blocking mode.
The mechanical dismantling method and blasting method have the following disadvantages:
the multi-span rigid frame arch bridge is dismantled to have a 'double arch effect', unbalanced thrust borne by each pier is always required to be strictly controlled in the construction and dismantling process when large machinery is adopted for dismantling, construction control is strictly complicated, unstable collapse of the whole bridge is easily caused by the fact that unbalanced force borne by middle piers is out of limit, and safety risk is large;
when the large mechanical blasting is used for removing, the vibration load has uncertain influence and damage on bridge dismantling safety, and the safety risk is increased; the blasting construction method also has high safety risk;
such dismantling methods often have great influence on the environment, generate great noise, raise dust and the like;
a large amount of crushed structures fall off the river channel due to a mechanical crushing method or a blasting method, the river channel is polluted, secondary cleaning and dredging are required, the difficulty in cleaning the waste slag of the channel is high, and the dredging cost is high;
and the construction has great influence on navigation and long navigation interruption time.
Therefore, in order to solve the problems, an unbalance-load-free quick dismantling method for a multi-span concrete rigid frame arch bridge is provided. The arch rib supporting frames are erected in advance before the old bridge is dismantled to bear unbalanced load in the bridge dismantling process, so that the middle pier is effectively prevented from bearing unbalanced unbalance load, and the bridge dismantling safety is improved; by adopting the modes of block cutting, block hoisting of hoisting equipment and transfer cleaning, the environmental pollution caused by a large amount of noise, raised dust and the like in the traditional process is avoided, no member falls into a river in the dismantling process, and the river channel dredging is not needed after the dismantling, so that the construction cost is saved; meanwhile, multi-equipment and multi-point synchronous construction can be realized, the traditional processes of manual pneumatic pick chiseling and the like are abandoned, the construction speed is greatly improved, and the construction period is saved.
Disclosure of Invention
The invention aims to provide an unbalance-load-free quick dismantling method for a multi-span concrete rigid frame arch bridge. The arch rib supporting frames are erected in advance before the old bridge is dismantled to bear unbalanced load in the bridge dismantling process, so that the middle pier is effectively prevented from bearing unbalanced unbalance load, and the bridge dismantling safety is improved; by adopting the modes of block cutting, block hoisting of hoisting equipment and transfer cleaning, the environmental pollution caused by a large amount of noise, raised dust and the like in the traditional process is avoided, no member falls into a river in the dismantling process, and the river channel dredging is not needed after the dismantling, so that the construction cost is saved; meanwhile, multi-equipment and multi-point synchronous construction can be realized, the traditional processes of manual pneumatic pick chiseling and the like are abandoned, the construction speed is greatly improved, and the construction period is saved.
The purpose of the invention can be realized by the following technical scheme:
a non-unbalance-load quick dismantling method for a multi-span concrete rigid frame arch bridge comprises the steps of erecting an old bridge dismantling trestle, erecting an old bridge arch rib support frame, dismantling a bridge deck attachment, dismantling a bridge deck panel, dismantling a transverse tie beam, dismantling a main arch rib, dismantling a pier and dismantling a bridge abutment, and the concrete dismantling method comprises the following steps:
erecting an old bridge to remove the trestle and providing an operation platform for removing the hoisting equipment for the arch rib of the old bridge;
erecting an old bridge arch rib support frame; the arch rib support frame is arranged at two positions corresponding to the arch large node position of the rigid frame in the single-span longitudinal bridge direction; each arch rib support frame adopts a vibration-arranged steel pile casing as a support, the top of the steel pile casing is provided with a double-spliced H582 type steel carrying pole beam and a triangular steel wedge block support arch rib, and the double-spliced H582 type steel carrying pole beam forms a transverse bridge bearing beam;
the top of the steel casing is longitudinally provided with a double-spliced I25I-shaped steel bearing beam in the bridge direction, the double-spliced I25I-shaped steel bearing beam is erected after a notch is formed in the steel casing, and a notch position is reinforced by adopting a welding limiting plate and a stiffening plate to ensure the stress of the notch position; the transverse bridge bearing beam is arranged at the center of the steel casing and spot-welded on the double-spliced I25I-shaped steel bearing beam at the top of the steel casing; processing a triangular steel wedge block by adopting a steel plate according to the actual size of each position corresponding to a triangular gap between the transverse bridge direction bearing beam and the arch rib, and filling the gap between the arch rib and the transverse bridge direction bearing beam;
dismantling the bridge deck attachment; dismantling the sidewalk plate, the guardrail, the pipeline and the bridge deck auxiliary structure by adopting P120 cannon machine small-sized equipment;
the bridge deck is dismantled; dismantling is carried out according to the principles of transverse bridge symmetry and longitudinal bridge symmetry; symmetrically arranging 1 25t truck cranes at two sides of the No. 2 pier in the longitudinal direction, synchronously removing the truck cranes from the No. 2 pier to two bridge abutments, cutting the bridge decks one by one in blocks by adopting a rope saw, and hoisting and transferring the truck cranes and the truck cranes from the bridge deck;
dismantling the transverse tie beam; the transverse tie beam is considered to be disassembled in two batches;
the first group of transverse tie beams and the bridge deck are removed synchronously;
the second group of transverse tie beams are not detached when the bridge deck is detached, and after the bridge deck is detached, the remaining transverse tie beams and 5 pieces of main arch ribs form an integral stable structure to ensure the stability of the main arch ribs; when the arch rib is dismantled, according to the arch rib blocks, before the corresponding arch rib blocks are dismantled, dismantling the corresponding transverse tie beams, and removing the transverse connection between the arch rib section to be dismantled and the adjacent arch rib;
removing the main arch rib; determining arch rib blocks according to the main arch rib structure, the distribution of transverse bridge-oriented arch ribs and the arrangement of trestles, and sequentially cutting and removing the arch ribs block by block; the hoisting equipment is parked on the trestle, the block to be disassembled is hoisted, cutting construction is carried out, after cutting is completed, the block is hoisted to the trestle, and then the block is turned away by a crane;
dismantling the bridge pier; before the bridge piers are dismantled, erecting a trestle; the blasting machine is parked on a deck of a stack, a parking position is removed from the pier top blasting machine, then the blasting machine is hoisted to the pier top parking position by adopting an automobile crane, and blasting removal of the pier body and the cushion cap is completed in sequence; a bucket is adopted to carry and clear away in time in the process of removing slag samples by the cannon;
dismantling the abutment; the abutment is located on the shore, and a cannon machine is directly adopted for crushing and dismantling.
As a further scheme of the invention: the trestle structure meets the bearing capacity requirement of parking and hoisting operation of construction equipment through required stress checking calculation; the trestle adopts the mode that both banks are set up toward the center of the river, and a navigation hole is reserved in the middle, so that the normal navigation of a channel is ensured, and the influence of bridge dismantling on the navigation is reduced.
As a further scheme of the invention: the structural design of the arch rib supporting frame is subjected to force checking calculation, so that the load borne in the old bridge dismantling process is ensured to be met.
As a further scheme of the invention: the top of the triangular steel wedge block is welded with a side edge-wrapped steel plate and is provided with an M18 expansion bolt, the contact surface between the bottom of the triangular steel wedge block and the double-spliced H582 type steel carrying pole beam is controlled to be horizontal, the contact surface between the bottom of the triangular steel wedge block and the double-spliced H582 type steel carrying pole beam is in sliding connection, the triangular steel wedge block is fixedly connected with the arch rib, the bottom of the triangular steel wedge block and the double-spliced H582 type steel carrying pole beam are not welded to keep free sliding, the self weight of the arch rib is ensured to be vertically transmitted to the carrying pole beam through the triangular steel wedge block, and the horizontal load of the.
As a further scheme of the invention: the filling and leveling layer, the rib axillary plate and the cantilever plate are removed by integral cutting, and layered stripping and removal are not considered, so that uncertain influence and damage of vibration load on bridge removal safety when a cannon machine is removed are avoided.
The invention has the beneficial effects that:
compared with the conventional method for dismantling the multi-span concrete rigid-framed arch bridge, the method for quickly dismantling the multi-span concrete rigid-framed arch bridge without unbalance loading is a method for dismantling the rigid-framed arch bridge with a bridge dismantling speed block, small environmental influence, safety and reliability, and has the following technical advantages and benefits:
the construction without unbalance loading is realized, the construction safety is improved, and the safety risk is greatly reduced
The arch rib supporting frames are erected in advance before the old bridge is dismantled to bear unbalanced loads in the bridge dismantling process, so that the middle piers are effectively prevented from bearing unbalanced unbalance loads, no unbalance loads exist in the construction process, and bridge dismantling safety is improved; the block cutting and the block dismantling are carried out, so that the requirement on equipment in the construction process is low, the hoisting speed is high, and the safety and the reliability are realized; by adopting the rope saw block cutting and hoisting mode, the uncertain influence and damage of vibration load on bridge dismantling safety during large-scale mechanical blasting removal are avoided, and the safety risk is reduced; and the deformation monitoring is carried out in real time when the bridge deck system and the bridge deck pavement are dismantled, so that the bridge instability is avoided in the dismantling process, and the construction safety is ensured.
The bridge dismantling speed block greatly improves the bridge dismantling efficiency, effectively shortens the construction period and obviously reduces the construction cost
According to the symmetry principle, synchronous construction of multiple devices and multiple points is realized, all working surfaces operate in parallel, and the work efficiency is high; in addition, the bridge deck pavement and rib axillary plates are cut and hoisted together in a blocking mode, all equipment is operated mechanically, the traditional processes that the bridge deck pavement is removed by manual pneumatic picks are abandoned, the construction speed is greatly improved, and the construction period is shortened. By saving the construction period, the labor and equipment investment in the process is reduced, and the construction cost is reduced.
Reducing environmental impact, avoiding river pollution, and having no need of dredging
By adopting the modes of block cutting, block hoisting of hoisting equipment and transfer cleaning, the problem of environmental pollution such as a large amount of noise, dust and the like caused by the traditional demolition construction method is solved, no member falls into a river in the demolition process, the river channel is prevented from being blocked in the demolition process, the river channel dredging is not needed after the demolition, and the dredging cost is saved;
greatly reducing the influence on navigation
Trestles are erected on two sides, and navigation holes are reserved to ensure normal passage of a navigation channel; by adopting the modes of block cutting and block hoisting, the river channel cannot be blocked in the dismantling process, and the smoothness of the river channel is ensured.
To sum up, the unbalance of the middle pier is eliminated by erecting the arch rib supporting frame, the scientific dismantling sequence is set, reasonable dismantling equipment is used, the defects that the traditional dismantling method is large in construction potential safety hazard, heavy in dismantling noise and dust, heavy in secondary clearing pollution and the like due to the fact that large-scale mechanical crushing or blasting is used for firstly and integrally collapsing and then secondary clearing is avoided, dismantling can be safely, efficiently and environmentally-friendly, the green construction concept is met, the purposes of reducing noise, reducing pollution and reducing disturbance to the surrounding environment are achieved, the old bridge dismantling construction technology is enriched, and the method has better reference significance for similar projects.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic plan view of a trestle according to the present invention;
FIG. 2 is a schematic elevation view of a trestle according to the present invention;
FIG. 3 is a schematic longitudinal cross-sectional view of the steel cylinder head and stiffener structure of the present invention;
FIG. 4 is a schematic longitudinal section of a triangular steel wedge of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-4, a method for rapidly removing a multi-span concrete rigid frame arch bridge without unbalance loading comprises the steps of erecting an old bridge removal trestle, erecting an old bridge arch rib support frame, removing a bridge deck attachment, removing a bridge deck, removing a transverse tie beam, removing a main arch rib, removing a pier and removing a bridge abutment, wherein the specific removal method comprises the following steps:
erecting an old bridge to remove the trestle and providing an operation platform for removing the hoisting equipment for the arch rib of the old bridge;
erecting an old bridge arch rib support frame; the arch rib support frame is arranged at two positions corresponding to the arch large node position of the rigid frame in the single-span longitudinal bridge direction; each arch rib support frame adopts a vibration-arranged steel pile casing as a support, the top of the steel pile casing is provided with a double-spliced H582 type steel carrying pole beam and a triangular steel wedge block support arch rib, and the double-spliced H582 type steel carrying pole beam forms a transverse bridge bearing beam;
the top of the steel casing is longitudinally provided with a double-spliced I25I-shaped steel bearing beam in the bridge direction, the double-spliced I25I-shaped steel bearing beam is erected after a notch is formed in the steel casing, and a notch position is reinforced by adopting a welding limiting plate and a stiffening plate to ensure the stress of the notch position; the transverse bridge bearing beam is arranged at the center of the steel casing and spot-welded on the double-spliced I25I-shaped steel bearing beam at the top of the steel casing; processing a triangular steel wedge block by adopting a steel plate according to the actual size of each position corresponding to a triangular gap between the transverse bridge direction bearing beam and the arch rib, and filling the gap between the arch rib and the transverse bridge direction bearing beam;
dismantling the bridge deck attachment; dismantling the sidewalk plate, the guardrail, the pipeline and the bridge deck auxiliary structure by adopting P120 cannon machine small-sized equipment;
the bridge deck is dismantled; dismantling is carried out according to the principles of transverse bridge symmetry and longitudinal bridge symmetry; symmetrically arranging 1 25t truck cranes at two sides of the No. 2 pier in the longitudinal direction, synchronously removing the truck cranes from the No. 2 pier to two bridge abutments, cutting the bridge decks one by one in blocks by adopting a rope saw, and hoisting and transferring the truck cranes and the truck cranes from the bridge deck;
dismantling the transverse tie beam; the transverse tie beam is considered to be disassembled in two batches;
the first group of transverse tie beams and the bridge deck are removed synchronously;
the second group of transverse tie beams are not detached when the bridge deck is detached, and after the bridge deck is detached, the remaining transverse tie beams and 5 pieces of main arch ribs form an integral stable structure to ensure the stability of the main arch ribs; when the arch rib is dismantled, according to the arch rib blocks, before the corresponding arch rib blocks are dismantled, dismantling the corresponding transverse tie beams, and removing the transverse connection between the arch rib section to be dismantled and the adjacent arch rib;
removing the main arch rib; determining arch rib blocks according to the main arch rib structure, the distribution of transverse bridge-oriented arch ribs and the arrangement of trestles, and sequentially cutting and removing the arch ribs block by block; the hoisting equipment is parked on the trestle, the block to be disassembled is hoisted, cutting construction is carried out, after cutting is completed, the block is hoisted to the trestle, and then the block is turned away by a crane;
dismantling the bridge pier; before the bridge piers are dismantled, erecting a trestle; the blasting machine is parked on a deck of a stack, a parking position is removed from the pier top blasting machine, then the blasting machine is hoisted to the pier top parking position by adopting an automobile crane, and blasting removal of the pier body and the cushion cap is completed in sequence; a bucket is adopted to carry and clear away in time in the process of removing slag samples by the cannon;
dismantling the abutment; the abutment is located on the shore, and a cannon machine is directly adopted for crushing and dismantling.
As a further scheme of the invention: the trestle structure meets the bearing capacity requirement of parking and hoisting operation of construction equipment through required stress checking calculation; the trestle adopts the mode that both banks are set up toward the center of the river, and a navigation hole is reserved in the middle, so that the normal navigation of a channel is ensured, and the influence of bridge dismantling on the navigation is reduced.
The structural design of the arch rib supporting frame is subjected to force checking calculation, so that the load borne in the old bridge dismantling process is ensured to be met.
The top of the triangular steel wedge block is welded with a side edge-wrapped steel plate and is provided with an M18 expansion bolt, the contact surface between the bottom of the triangular steel wedge block and the double-spliced H582 type steel carrying pole beam is controlled to be horizontal, the contact surface between the bottom of the triangular steel wedge block and the double-spliced H582 type steel carrying pole beam is in sliding connection, the triangular steel wedge block is fixedly connected with the arch rib, the bottom of the triangular steel wedge block and the double-spliced H582 type steel carrying pole beam are not welded to keep free sliding, the self weight of the arch rib is ensured to be vertically transmitted to the carrying pole beam through the triangular steel wedge block, and the horizontal load of the.
The filling and leveling layer, the rib axillary plate and the cantilever plate are removed by integral cutting, and layered stripping and removal are not considered, so that uncertain influence and damage of vibration load on bridge removal safety when a cannon machine is removed are avoided.
This no unbalance loading of multispan concrete rigid frame arched bridge demolishs method fast, through setting up the unbalanced unbalance loading of middle mound of arch rib support frame elimination, set up scientific demolishs the order, use reasonable demolishs equipment, it utilizes large-scale mechanical breakage or blasting to carry out earlier the secondary clearance after wholly collapsing to have avoided traditional demolishs method, construction potential safety hazard is big, demolish the noise dust heavy, secondary clearance pollutes shortcomings such as serious, make demolishs to go on safely, high-efficient, the environmental protection ground, accord with green construction theory, realize the noise reduction, the pollution abatement, reduce the purpose to the disturbance of all ring edge borders, it demolishs construction technology to have richened old bridge, there is better reference meaning to similar engineering.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. A non-unbalance-load quick demolition method for a multi-span concrete rigid frame arch bridge is characterized by comprising the steps of erecting an old bridge demolition trestle, erecting an old bridge arch rib support frame, dismantling a bridge deck attachment, dismantling a bridge deck, dismantling a transverse tie beam, dismantling a main arch rib, dismantling a pier and dismantling a bridge abutment, and the specific demolition method comprises the following steps:
s1, erecting an old bridge to remove the trestle, and providing a working platform for the arch rib removing and hoisting equipment of the old bridge;
s2, erecting an old bridge arch rib support frame; the arch rib support frame is arranged at two positions corresponding to the arch large node position of the rigid frame in the single-span longitudinal bridge direction; each arch rib support frame adopts a vibration-arranged steel pile casing as a support, the top of the steel pile casing is provided with a double-spliced H582 type steel carrying pole beam and a triangular steel wedge block support arch rib, and the double-spliced H582 type steel carrying pole beam forms a transverse bridge bearing beam;
the top of the steel casing is longitudinally provided with a double-spliced I25I-shaped steel bearing beam in the bridge direction, the double-spliced I25I-shaped steel bearing beam is erected after a notch is formed in the steel casing, and a notch position is reinforced by adopting a welding limiting plate and a stiffening plate to ensure the stress of the notch position; the transverse bridge bearing beam is arranged at the center of the steel casing and spot-welded on the double-spliced I25I-shaped steel bearing beam at the top of the steel casing; processing a triangular steel wedge block by adopting a steel plate according to the actual size of each position corresponding to a triangular gap between the transverse bridge direction bearing beam and the arch rib, and filling the gap between the arch rib and the transverse bridge direction bearing beam;
s3, dismantling the bridge deck attachment; dismantling the sidewalk plate, the guardrail, the pipeline and the bridge deck auxiliary structure by adopting P120 cannon machine small-sized equipment;
s4, removing the bridge deck; dismantling is carried out according to the principles of transverse bridge symmetry and longitudinal bridge symmetry; symmetrically arranging 1 25t truck cranes at two sides of the No. 2 pier in the longitudinal direction, synchronously removing the truck cranes from the No. 2 pier to two bridge abutments, cutting the bridge decks one by one in blocks by adopting a rope saw, and hoisting and transferring the truck cranes and the truck cranes from the bridge deck;
s5, removing the transverse tie beam; the transverse tie beam is considered to be disassembled in two batches;
the first group of transverse tie beams and the bridge deck are removed synchronously;
the second group of transverse tie beams are not detached when the bridge deck is detached, and after the bridge deck is detached, the remaining transverse tie beams and 5 pieces of main arch ribs form an integral stable structure to ensure the stability of the main arch ribs; when the arch rib is dismantled, according to the arch rib blocks, before the corresponding arch rib blocks are dismantled, dismantling the corresponding transverse tie beams, and removing the transverse connection between the arch rib section to be dismantled and the adjacent arch rib;
s6, removing the main arch rib; determining arch rib blocks according to the main arch rib structure, the distribution of transverse bridge-oriented arch ribs and the arrangement of trestles, and sequentially cutting and removing the arch ribs block by block; the hoisting equipment is parked on the trestle, the block to be disassembled is hoisted, cutting construction is carried out, after cutting is completed, the block is hoisted to the trestle, and then the block is turned away by a crane;
s7, dismantling the pier; before the bridge piers are dismantled, erecting a trestle; the blasting machine is parked on a deck of a stack, a parking position is removed from the pier top blasting machine, then the blasting machine is hoisted to the pier top parking position by adopting an automobile crane, and blasting removal of the pier body and the cushion cap is completed in sequence; a bucket is adopted to carry and clear away in time in the process of removing slag samples by the cannon;
s8, detaching the abutment; the abutment is located on the shore, and a cannon machine is directly adopted for crushing and dismantling.
2. The unbiased load quick demolition method of a multi-span concrete rigid frame arch bridge according to claim 1, characterized in that the trestle adopts a mode of erecting both banks toward the center of the river and reserving a navigation hole in the middle.
3. The method for rapidly dismantling a multi-span concrete rigid-framed arch bridge without unbalance loading according to claim 1, wherein the top of the triangular steel wedge block is welded with a steel plate with a side edge covered and is provided with an M18 expansion bolt, the contact surface between the bottom of the triangular steel wedge block and the double-spliced H582 steel carrying pole beam is controlled to be horizontal, and the contact surface between the bottom of the triangular steel wedge block and the double-spliced H582 steel carrying pole beam is in sliding connection.
4. The method for rapidly removing the multi-span concrete rigid frame arch bridge without unbalance loading according to claim 1, wherein the filling and leveling layer, the rib axillary plate and the cantilever plate are removed by integral cutting.
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| CN115125876B (en) * | 2022-05-17 | 2023-03-24 | 广西北投交通养护科技集团有限公司 | Method for quickly dismantling low pier multi-arch bridge based on shearing failure of pier |
| CN114941293A (en) * | 2022-06-08 | 2022-08-26 | 广西北投交通养护科技集团有限公司 | Demolition method for breaking multi-arch bridge based on shallow foundation slippage |
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