CN111501584A - Bridge dismantling construction method for prestressed concrete continuous beam - Google Patents
Bridge dismantling construction method for prestressed concrete continuous beam Download PDFInfo
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- CN111501584A CN111501584A CN202010242148.1A CN202010242148A CN111501584A CN 111501584 A CN111501584 A CN 111501584A CN 202010242148 A CN202010242148 A CN 202010242148A CN 111501584 A CN111501584 A CN 111501584A
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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 construction, in particular to a bridge dismantling construction method for a prestressed concrete continuous beam, which is used for dismantling a flange plate of the prestressed concrete continuous beam; erecting a temporary supporting system, wherein the temporary supporting system is used for temporarily supporting the 0# block and the side span cast-in-place section of the prestressed concrete continuous beam and temporarily solidifying the pier beam; cutting and removing the folded section; erecting hanging baskets on the beam bodies of the residual prestressed concrete continuous beams, cutting and dismantling the residual beam bodies of the prestressed concrete continuous beams block by block in the reverse order direction of hanging basket construction, hoisting the cut beam body sections to a barge below through the hanging baskets, and transporting the beam body sections through the barge; after the completion, the hanging basket is dismantled, and the 0# block is cut and dismantled in blocks; cutting and removing the side hole cast-in-place section; and cutting and removing the lower structure of the prestressed concrete continuous beam. The invention has the advantages that: the influence on navigation of the channel is relatively small, the pollution to water is small, and the construction progress of the dismantling project is greatly improved.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge dismantling construction method for a prestressed concrete continuous beam.
Background
When the prestressed concrete continuous beam dismantling engineering is dismantled, a large amount of building garbage is easily generated, and because the channel below the bridge is generally in a navigation use state, the channel needs to be closed for safety when the bridge is dismantled, the generated building garbage can generate great pollution to water, and meanwhile, the channel needs to be closed for a long time when the dismantled garbage is broken and cleared.
Disclosure of Invention
The invention aims to provide a construction method for dismantling a bridge of a prestressed concrete continuous beam according to the defects of the prior art, which adopts a method of static cutting and beam body hoisting and transportation, has relatively high cost, small pollution to water and relatively small influence on navigation of a channel, and greatly improves the construction progress of dismantling engineering and ensures the normal traffic condition of an inland waterway by transporting generated garbage to a shore instead of water.
The purpose of the invention is realized by the following technical scheme:
a bridge dismantling construction method for a prestressed concrete continuous beam is characterized by comprising the following steps: the construction method comprises the following steps: dismantling the flange plate of the prestressed concrete continuous beam; erecting a temporary supporting system, wherein the temporary supporting system is used for temporarily supporting the 0# block and the side span cast-in-place section of the prestressed concrete continuous beam and temporarily solidifying the pier beam; cutting and removing the folded section; erecting hanging baskets on the beam bodies of the rest prestressed concrete continuous beams, cutting and dismantling the rest beam bodies of the prestressed concrete continuous beams block by block in the reverse order direction of hanging basket construction, hoisting the cut beam body sections to a barge below through the hanging baskets, and transporting the beam body sections through the barge; after the completion, the hanging basket is dismantled, and the 0# block is cut and dismantled in blocks; cutting and removing the side hole cast-in-place section; and cutting and removing a lower structure of the prestressed concrete continuous beam.
Before the main body of the prestressed concrete continuous beam is dismantled, the auxiliary structures on the bridge deck of the prestressed concrete continuous beam are dismantled.
And the process of cutting and removing the closure segment comprises the cutting and removing of a midspan closure segment and a side span closure segment, wherein two corresponding cutting surfaces of the midspan closure segment and the side span closure segment are cut into an inverted splayed shape.
The prestressed concrete continuous beam is constructed in a half-width mode and is driven by a half-width vehicle in sequence.
The invention has the advantages that: the influence on navigation of the channel is relatively small, the pollution to water is small, and the generated building garbage is transported to the shore instead of the water, so that the construction progress of the demolition project is greatly improved, and the normal passing condition of the inland waterway is also ensured; in the whole construction engineering, the whole bridge is effectively supported and is always in a stable state, the safety coefficient is high, construction accidents are avoided, and the construction safety is ensured.
Drawings
FIG. 1 is a construction flow chart of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
example (b): the construction method for dismantling the bridge by the prestressed concrete continuous beam in the embodiment comprises the following steps, which are specifically described in combination with a certain engineering example:
river channel cleaning: the hoisting of the main bridge superstructure demolition mainly adopts large-scale floating cranes and barges, so the river channels on the transportation route need to be cleaned before demolition, and the large-scale floating cranes and barges can be ensured to pass on the transportation route.
When the upper continuous beam is cut, the steel pipe pile needs to be driven, and due to the fact that garbage such as broken stones exists in a river, the position where the steel pipe pile is driven needs to be cleaned, and the steel pipe pile can be driven.
Dismantling continuous beam auxiliary facilities: before the main structure is cut and removed, structures such as curb stones, skirts, steel guardrails, lamp posts and bridge deck pavement layers on the bridge deck need to be removed in advance, and the entrance conditions of equipment such as cranes, hanging baskets and diamond rope saws are met.
And (3) measurement and paying-off: before cutting construction, the positions of the hoisting holes, the rope penetrating holes and the cutting lines need to be accurately lofted according to a cutting line layout diagram.
Because each section of box girder connecting section is provided with a longitudinal prestressed anchor cable lock, in order to prevent the cutting off of prestress in the cutting process and damage the box girder structure, the longitudinal cutting width of the flange plate is determined to avoid the position of the prestressed tendon. The cut section of the box girder should be translated for 0.3m on the basis of the original interface, and a prestressed anchor cable lock head is avoided.
Dismantling the flange plate: in order to reduce the self weight of the structure and ensure the safety of bridge dismantling construction, the box girder body is cut and dismantled firstly before cutting. The cutting of the flange plate can adopt diamond static cutting equipment, so that the disturbance of the main structure of the box girder is small during cutting, and the stability of the whole structure of the main bridge is ensured.
The approach bridge is not demolished for the time before the flange plate is demolished, the approach bridges on the two sides can be used as demolition construction channels of the flange plate, and the approach bridge is demolished after the flange plate is demolished.
In the specific implementation: the flange plates are cut and separated by a diamond rope saw or a diamond circular saw static force and are hoisted to a flat car by a truck crane to be transported to a crushing field for crushing and absorption. The truck crane and the flat car are both at the bridge floor station, and are firstly hoisted by a crane and then cut and separated before cutting. The cutting along the bridge direction adopts a diamond disc saw, and the cutting along the transverse bridge direction adopts a diamond wire saw machine.
Erecting a temporary supporting system: for a large-span prestressed concrete continuous beam adopting hanging basket cantilever pouring construction, a steel pipe pile and a support frame are required to be arranged below a zero block and a side span cast-in-place section before a main bridge box girder is cut and dismantled, the pier girder is temporarily solidified simultaneously, a temporary support system is formed by two support measures, and the position, the diameter, the soil penetration depth and the arrangement mode of the steel pipe pile, the steel support frames of the main pier and the side pier and the like are required to be determined through calculation.
22 steel pipe piles with phi =630mm and t =8mm are arranged around the main pier of the main bridge and are driven into soil; two middle steel pipe piles are not easy to drive, 609 steel supports are directly adopted, phi =609mm, t =12mm steel pipes support 2 steel pipes, and the embedded steel bars are supported on a bearing platform. 10 steel pipe piles with phi =630mm and t =12mm are symmetrically arranged on two sides of the main bridge side pier.
500 × 300 × 11 × 018 double-spliced I-steel welded steel box girders are arranged on the top of the steel pipe pile along the bridge direction at the main pier of the main bridge, 500 × 1300 × 311 × 418 double-spliced I-steel welded steel box girders are arranged on the top of the steel pipe pile along the bridge direction at the cast-in-place section of the main bridge support, 500 × 300 × 11 × 18 double-spliced I-steel welded steel box girders 2 are arranged on the top of the steel pipe pile along the bridge direction at the cast-in-place section of the main bridge support, and 500 × 300 × 11 × 18 double-spliced I-steel welded steel box girders 37 are arranged on the top of the steel pipe pile along the bridge direction, in order to improve the overall rigidity and stability of the support pier, × 2100 × 100 × 10.
And the zero block bracket, the side span linear section bracket and the box girder are symmetrically wedged tightly by steel wedges. Before wedging the steel wedge, a jack is adopted for pre-jacking.
Temporary consolidation: the upper steel plate and the lower steel plate of the support are welded together by using the steel plates, the connection part (around the support) of the pier stud and the main bridge is poured to be solid by using the high-strength grouting material, and finally, the gap is poured to be compact by using the epoxy glue solution.
In order to prevent the asymmetrical construction of two sides during cutting, the steel wire ropes for drilling holes below the 1# or 2# bottom plates and on the pier body are oppositely pulled before cutting, so that the anti-overturning capacity of the upper structure is enhanced.
After the temporary steel support system is installed, a plurality of temporary piles are driven on the outermost periphery of the temporary steel support system, warning signs and light reflecting facilities are attached, and meanwhile, the temporary steel support frames are connected through channel steel. After the dismantling is finished, the pile body is dismantled so as to avoid influencing navigation.
Cutting and dismantling the closure section: in order to avoid the prestressed anchor cable lock, the cutting sections at the two ends of the midspan closure segment translate 0.3m towards the midspan direction, the actual cutting segment box girder length of the midspan closure segment becomes 1.4m, and the weight is about 29 tons; the cutting section of the side span closure segment translates 0.3m towards the side span direction. In order to smoothly hang the closure section, two corresponding cutting surfaces of the mid-span closure section and the side-span closure section are cut into an inverted splayed shape.
And (3) hoisting the cutting block by using a floating crane before cutting, simultaneously cutting two sides after tightening the steel wire rope, hoisting the cutting block on a barge after cutting, and transporting the cutting block to the shore. Because the folding section is positioned in the center of the channel, temporary navigation sealing measures are required when the floating crane is hoisted, and the navigation sealing time is about 4 hours.
Cutting and detaching a section from nine to one: the overall process is as follows:
after the cutting of the folded section is finished, the cutting and dismantling task of the 1# -9# box girder can be started (the cutting is started from the 9# section). And 4 universal rod hanging baskets are assembled and installed in place. And then cutting and drilling by using a diamond chain saw machine and a thin-wall drill according to the positions of the cutting line and the hoisting hole. Before the box girder is cut, the cutting segment is hung by using a hanging basket, and the weight of the initial tension load of the pulley block is 1.1 times of that of the removed segment. After the cutting is finished, the box girder is placed on a barge waiting under a bridge by using a hanging basket, the box girder is conveyed to a shore crushing field to be crushed, and finally, the box girder is absorbed and cleaned.
Hanging basket hoisting construction process:
the main bridge is dismantled and totally put into 4 and hang the basket, the symmetry is installed, hangs the basket and comprises main purlin, preceding entablature, suspension system, back anchor, front and back fulcrum and suspension pad roof beam.
1) Hanging basket installation
After the folding sections are separated, hanging baskets are assembled on two sides of the main pier simultaneously. Firstly, a main bearing diamond frame of a cradle is installed on a 9# section of a cross cast-in-place section by using a truck crane, then a track sliding plate, a front support, the diamond frame, a transverse connection system, a rear anchor beam, a front upper cross beam, a winch and a hoisting accessory are respectively installed, and finally the rear anchor of the cradle is anchored on a box girder by using phi 32 high-strength finish-rolled deformed steel bars through a preformed hole on a box chamber.
2) Box girder drilling
And drilling holes on the box girder according to the hoisting position to serve as hole sites for threading.
3) And (5) hanging the cradle.
4) Retreating the hanging basket:
after the current hoist and mount is accomplished, when beginning next hoist and mount, hang the basket and must retreat, the step as follows:
(1) before the cradle retreats, a balance weight is added on the rear anchor beam, the weight is 10 tons, and the rear anchor rod of the cradle is removed.
(2) And measuring the position of the backward moving track of the hanging basket, and paving a track plate. The transverse bridge direction and the longitudinal bridge direction of the track slab are both additionally provided with limiting devices, so that the stability of the track slab is ensured.
(3) And synchronously pulling by using a 10-ton hand hoist to synchronously move the main truss of the cradle backwards to the position required by the work. The moving speed of the hanging basket is controlled to be about 5-10 cm/min, the moving process must be stable, and whether a place is clamped or not needs to be checked in time when the hanging basket is difficult to retreat. The left truss and the right truss are kept balanced in the moving process of the cradle, the distance between the front main truss and the rear main truss is controlled within 10cm (one line is drawn on each 10cm of the track slab), and meanwhile, the unbalanced moment difference of two ends is ensured to meet the design requirement (the retreating difference of the main trusses at the two ends is not more than 1 m).
(4) And after the main truss moves backwards to the right position, anchoring the rear anchor point of the hanging basket, and removing the redundant track plate in front of the hanging basket.
(5) And finishing the movement of the hanging basket.
Hoisting the box girder:
1) and (4) clearing deposits and irrelevant mechanical equipment in the bridge deck and the box girder, and reserving construction space required by cutting construction and box girder descending.
2) And (4) measuring and lofting, lofting holes needed by the hoisting beam body according to a drawing, wherein the top plate adopts a concrete drilling machine and penetrates through the top plate. And drilling according to the measurement lofting point, wherein the drilled hole is smooth and straight, and the aperture verticality error is controlled within 1 cm.
3) Installing a hoisting system: and (4) installing a hoisting load-bearing beam, pulling through a 32mm high-strength fine-rolled threaded steel bar suspender, and installing an inclined-pad steel wedge block to ensure that the stress is vertical.
4) Cutting the beam section: before the box girder is cut, the cut sections are hung on the rhombic bearing frame by using the safety hanging rod of the front upper cross beam of the hanging basket. The box girder is cut by the diamond rope saw, the cutting surface is marked with dimensions according to a drawing, and protective measures are taken during the cutting process so as to avoid the influence of the diamond rope of the cutting machine rotating at a high speed on construction equipment.
5) Hoisting a beam body: cutting to separate blocks, removing a front upper cross beam safety suspender, slowly putting down the blocks by a winch at the top of the cradle, lifting by utilizing a fixed pulley fixed on the front cross beam and 6 groups of movable pulleys, putting the barge in place when the blocks are 3m away from the water surface, directly putting the blocks on the barge, transporting the blocks to the shore, and stacking the blocks by using a floating crane ship unloader. And removing the blocks in a storage yard, and directly crushing by using a crusher.
6) After the dismantling and hoisting operation of the block is finished, the hanging basket retreats to carry out the dismantling operation of the next block. And repeating the steps, and sequentially removing the 9# and 8# … 1# block pieces from the main span and the side span to the main pier position according to the reverse sequence.
Crushing a box girder: and conveying the cut and dismantled concrete block body to a site, directly crushing the concrete block body by using a head picking machine, and taking a watering dust-settling measure on the crushing site.
Cutting and dismantling a zero block and a side span cast-in-place section: and (3) cutting and dismantling a zero block:
and (4) after the 1# -9# box girder is cut, removing the hanging basket, and starting the removal construction of the zero block. And as the zero block is heavy, the block is cut by static cutting equipment and then lifted by a 150-ton floating crane. And according to the site construction conditions and the lifting capacity of the floating crane, the weight of each cutting block is controlled within 90 tons.
The No. 0 block is divided into 6 blocks, the blocks are sequentially hoisted one by one, a 150t floating crane is adopted for hoisting, the floating crane stops in a temporary stop area, no navigation sealing is needed, and the floating crane directly hoists the blocks. As the blocks in the No. 0 block are basically about 80t, the angle of the floating crane cannot be small, the operation radius is small, the floating crane can only directly move for a proper distance, then the floating crane is stopped, and then the hoisting blocks are placed in a crushing field.
Cutting and dismantling the cast-in-place section of the side hole:
and cutting and dismantling the 0# block, and simultaneously, cutting and dismantling the cast-in-place section of the side hole.
The side hole cast-in-place section is removed in sections by static cutting of a diamond rope saw, a floating crane is used for lifting in a matched mode, and the maximum weight of a cutting block body is about 78 tons. Because the cast-in-place section of the side hole is positioned near the river bank, the water level is shallow and is greatly influenced by the flood and tide, and the weight of the cutting block body can be properly adjusted according to the water level in the construction process. And if the water level is greatly reduced and the floating crane cannot be lifted, the floating crane is lifted by the crawler crane. If a crawler crane is used for hoisting the blocks at the side hole cast-in-place section instead, the site needs to be cleaned and leveled, the walking route of the hoisting machine needs to be paved with pond residues and then leveled and compacted, the hoisting and driving requirements are met, all obstacles in the construction range are cleared, the width of the walking route of the machine is not less than 8m, the thickness of the paved construction waste pond residues is larger than 60cm, and steel roadbed box plates are paved after compaction and leveling so as to carry out hoisting.
Cutting and dismantling a lower structure: after the task of dismantling the upper structure is completed, the dismantling construction of lower structures such as pier columns, bearing platforms, pile foundations and the like of the main pier and the side piers can be started.
The cutting blocks are hoisted by a 150-ton hoisting crane, the weight of each cutting block is controlled within 70 tons (the underwater structure is properly adjusted according to needs), and parts such as a bearing platform, a pile foundation and the like need to be cut underwater, wherein the cutting depth of the pile foundation of the main pier reaches the top surface of a sludge layer.
Before underwater cutting, a diver needs to perform underwater probing on a foundation cast-in-place pile riverbed to measure the depth of sediment, the position of an object possibly influencing demolition, the height of the cast-in-place pile and the like.
1) And removing silt and barriers around the cast-in-place pile. The barrier can be cleaned by a back-shovel excavator for the whole underwater sweeping bed at the lower part of the removed bridge. And after the mechanical cleaning is finished, a diver is used for launching, touching and checking, and if necessary, the diver is used for manually cleaning. And (4) determining to remove the sludge by using a sand suction boat or a high-pressure water gun according to the depth of the sludge.
2) A construction platform is erected by utilizing the hoisting ship and the bearing platform and is used for placing cutting machinery and facilitating operation of workers.
3) The safety technology is carried out on divers, and the divers have the following main underwater tasks: installing a rope saw, trial cutting, installing a hoop for hoisting and tying a lifting rope; and the accurate and firm installation position is ensured. Therefore, training is required before water is discharged, skill is mastered, and water entering time is shortened.
In the embodiment, in specific implementation: the scheme of half-width construction and half-width traffic is adopted, namely, traffic of one bridge is firstly sealed, traffic flow is completely transferred to the other bridge, and then the work of dismantling and rebuilding one bridge is sealed and transferred; the main bridge is constructed by adopting a hanging basket reverse-order (in terms of construction direction) static force dismantling scheme, and the approach bridge simple support plate beam is dismantled by adopting a bridge deck mechanical chiseling combined beam body hoisting and transporting method.
And (4) cutting and dismantling the upper structure of the main bridge according to the reverse order of the construction order of the hanging baskets. The method comprises the steps of firstly removing a box girder flange plate and an anti-collision wall, then removing closure sections of a main span and a side span, removing the main bridge box girder according to the sequence of a No. 9 block → a No. 0 block, and finally removing a side span cast-in-place section, wherein the closure sections and the side span cast-in-place section are removed by a floating crane or a crawler crane after being cut. And after the 9# block → 0# block is cut, the block is lifted by a hanging basket to a barge, transported to the shore and lifted to a crushing site. In order to ensure the balance of the upper structure in the dismantling process, the two sides of the column pier are symmetrically dismantled, temporary supports are arranged on the two sides of the column pier and temporarily solidify the support, and a steel pipe pile supporting platform is arranged below the main bridge side span cast-in-place section before cutting and serves as a temporary placing platform for the cutting block. The main bridge substructure and foundation are removed by a method of lifting to a barge for outward transportation by a floating crane after being cut in blocks, and the bearing platform and the pile foundation need to adopt an underwater cutting process.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, they are not to be considered repeated herein.
Claims (4)
1. A bridge dismantling construction method for a prestressed concrete continuous beam is characterized by comprising the following steps: the construction method comprises the following steps: dismantling the flange plate of the prestressed concrete continuous beam; erecting a temporary supporting system, wherein the temporary supporting system is used for temporarily supporting the 0# block and the side span cast-in-place section of the prestressed concrete continuous beam and temporarily solidifying the pier beam; cutting and removing the folded section; erecting hanging baskets on the beam bodies of the rest prestressed concrete continuous beams, cutting and dismantling the rest beam bodies of the prestressed concrete continuous beams block by block in the reverse order direction of hanging basket construction, hoisting the cut beam body sections to a barge below through the hanging baskets, and transporting the beam body sections through the barge; after the completion, the hanging basket is dismantled, and the 0# block is cut and dismantled in blocks; cutting and removing the side hole cast-in-place section; and cutting and removing a lower structure of the prestressed concrete continuous beam.
2. The bridge dismantling method for the prestressed concrete continuous beam as claimed in claim 1, wherein: before the main body of the prestressed concrete continuous beam is dismantled, the auxiliary structures on the bridge deck of the prestressed concrete continuous beam are dismantled.
3. The bridge dismantling method for the prestressed concrete continuous beam as claimed in claim 1, wherein: and the process of cutting and removing the closure segment comprises the cutting and removing of a midspan closure segment and a side span closure segment, wherein two corresponding cutting surfaces of the midspan closure segment and the side span closure segment are cut into an inverted splayed shape.
4. The bridge dismantling method for the prestressed concrete continuous beam as claimed in claim 1, wherein: the prestressed concrete continuous beam is constructed in a half-width mode and is driven by a half-width vehicle in sequence.
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| CN112502057A (en) * | 2020-12-11 | 2021-03-16 | 中铁大桥局武汉桥梁特种技术有限公司 | Method for dismantling prestressed concrete continuous beam |
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| CN112252212A (en) * | 2020-10-27 | 2021-01-22 | 中交路桥华南工程有限公司 | Method for dismantling prestressed concrete variable cross-section continuous beam bridge |
| CN112502057A (en) * | 2020-12-11 | 2021-03-16 | 中铁大桥局武汉桥梁特种技术有限公司 | Method for dismantling prestressed concrete continuous beam |
| CN113944114A (en) * | 2021-11-10 | 2022-01-18 | 上海市基础工程集团有限公司 | Dismantling construction method for large-span prestressed concrete cable-stayed bridge |
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