CN113089510A - Method for dismantling reinforced concrete continuous box girder overpass bridge - Google Patents
Method for dismantling reinforced concrete continuous box girder overpass bridge Download PDFInfo
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- CN113089510A CN113089510A CN202110402477.2A CN202110402477A CN113089510A CN 113089510 A CN113089510 A CN 113089510A CN 202110402477 A CN202110402477 A CN 202110402477A CN 113089510 A CN113089510 A CN 113089510A
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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 discloses a method for dismantling a reinforced concrete continuous box girder overpass bridge, which comprises the steps of dismantling a girder body and a bridge pier of a bridge to be dismantled in a segmented mode by carrying out segmented planning on the girder body, erecting temporary supports corresponding to the bridge pier, hoisting and cutting the bottom of the girder body pocket firstly and cutting, dismantling and adjusting rear pier studs; after the beam bodies and the piers are dismantled, the abutment structures on the two sides, the dismantled beam bodies and the piers are crushed, and construction slag generated in the crushing process is conveyed to a roadbed filling to be filled in layers to finish the whole bridge dismantling work. The invention plans the girder body longitudinally and sectionally according to the number of the piers, sets a temporary buttress to one side of the longitudinal bridge corresponding to each pier, cuts, hoists and adjusts the pier in sections, not only achieves the purposes of reducing noise, pollution and disturbance to the surrounding environment, but also reduces construction consumables while ensuring construction safety, reduces construction cost, is convenient and quick for the whole demolition construction, shortens construction period and reduces social influence.
Description
Technical Field
The invention relates to the technical field of bridge demolition construction, in particular to a demolition method of a reinforced concrete continuous box girder overpass bridge.
Background
With the rapid increase of urban traffic volume and traffic axle load, the service level of the expressway built into a communication vehicle in the nineties of the last century is obviously lagged behind the current economic development, in order to improve the traffic capacity and better serve the economic development of the surrounding areas, a plurality of expressways are beginning to be reconstructed and expanded, and in the reconstruction and expansion construction process of the expressway, the situation that a overpass bridge is removed to meet the reconstruction and expansion requirements is often encountered.
The 'easy bridge construction and difficult bridge dismantling' are well known in the industry, the relevant bridge construction processes are mature, and the bridge dismantling is in the process technology exploration and experience accumulation stage. A special overpass, namely a pedestrian overpass, exists on a highway route, the bridge is mostly a reinforced concrete continuous box girder overpass, when the bridge is dismantled, the bridge is mostly dismantled by adopting a mechanical breaking or directional blasting mode, however, concrete fragments dismantled by adopting the mechanical breaking and dismantling mode easily fall onto a bottom highway to damage the highway, and the concrete fragments produced by breaking are irregular in structure and different in size, so that the problem that the concrete fragments are difficult to transfer exists; the directional blasting demolition mode is high in safety risk, damage to a highway is caused, large noise and a large amount of dust are generated, the disturbance to the surrounding environment is large, and pollution is caused.
Therefore, the prior art provides a continuous beam dismantling method (application number: CN201710710865.0), which adopts a block cutting mode and combines with a bridge girder erection machine to carry out beam body cutting and dismantling, thereby achieving the purposes of reducing noise, reducing dust and safe construction, and reducing the probability of damage to a highway caused by concrete fragments falling. However, the dismantling method needs to additionally set up a bridge erecting machine, the construction period can be seriously prolonged in the setting process, the setting requirement condition of the bridge erecting machine is harsh, the span of a beam section is also needed to be used as a setting base point to meet the purpose of walking or longitudinally moving on a beam piece, and the two ends of a pedestrian overpass on a highway are mostly in special geographic environments such as hillsides or terraces, so that the installation requirement of the bridge erecting machine is difficult to meet.
Disclosure of Invention
Therefore, in order to solve the above problems, it is necessary to provide a method for dismantling a reinforced concrete continuous box girder overpass bridge, which can effectively dismantle a pedestrian overpass on a highway, wherein the pedestrian overpass is constructed by using reinforced concrete continuous box girders, so as to achieve the purposes of reducing influence, high efficiency and environmental protection.
The invention is realized by the following technical scheme:
a method for dismantling a reinforced concrete continuous box girder overpass bridge comprises a girder body and a plurality of piers on the lower side of the girder body, and comprises the following steps:
s1, performing sectional planning on the beam body along the longitudinal bridge direction, and dividing a plurality of beam sections to be disassembled;
s2, setting up temporary buttresses on one side of each pier in the longitudinal direction of the longitudinal bridge, and determining a cutting surface of the beam body between each group of piers and the corresponding temporary buttresses by taking each pier and the corresponding temporary buttresses as a group;
s3, determining a to-be-dismounted beam section to be cut, hoisting and pocketing the to-be-dismounted beam section to be cut through hoisting equipment, cutting the to-be-dismounted beam section which is pocketed by hoisting and hanging along a cutting surface, wherein the to-be-dismounted beam section to be cut is supported by temporary buttresses at two ends of the to-be-dismounted beam section or a temporary buttress at one end of the to-be-dismounted beam section and a pier at the other end of the to-be-dismounted beam section respectively, and after the hoisting equipment is stressed stably, hoisting and adjusting the to-be-dismounted beam section to be cut off;
s4, dismantling the pier and the temporary pier corresponding to the cut beam section to be dismantled and adjusting away from the site;
and S5, repeating the steps S3 and S4 until the dismantling work of all the beam sections to be dismantled, the piers and the temporary buttresses is completed.
In one embodiment, when the bridge abutment structures are arranged on two sides of the beam body, after the beam body, the bridge piers and the temporary buttresses are dismantled, the method further comprises the following steps:
and S6, crushing the abutment structures on the two sides of the bridge to be disassembled, the disassembled beam body and the pier, and conveying the construction slag generated in the crushing process to a roadbed filling for layered filling.
In one embodiment, the beam section to be disassembled, which covers the lower line of the bridge, in the beam sections to be disassembled is a cross line middle beam section, and the beam sections to be disassembled on two sides of the lower line of the bridge are cross line outer beam sections; in step S3, the over-line middle beam section is cut as the beam section to be detached.
In one embodiment, the lower line of the bridge comprises a plurality of groups of parallel passing roads and a division belt between two adjacent groups of passing roads, and the middle beam section of the cross line is supported by piers arranged in the division belt; when the middle beam section of the span line is cut, the beam sections to be dismantled distributed on the traffic road are hoisted, cut, hoisted and separated at the same time.
In one embodiment, the upper end of the temporary pier is provided with a support structure, the support structure is abutted against the lower end face of the beam body, and the support structure exceeds the lower end face of the beam body in the transverse bridge direction.
In one embodiment, a sleeper is further inserted between the support structure and the beam body, and the support structure is abutted against the lower end face of the beam body through the sleeper.
In one embodiment, the cut plane is perpendicular to the longitudinal bridging direction.
In one embodiment, when the beam section to be disassembled to be cut is hoisted through the hoisting equipment, four hoisting points are symmetrically arranged on the flange plates on two sides of the beam section to be disassembled in the transverse bridge direction, and the two steel wire ropes pass through the hoisting points along the transverse bridge direction respectively to hoist the pocket bottom of the beam section to be disassembled.
In one embodiment, the four suspension points include a first suspension point and a second suspension point which are positioned on one side of the beam section to be disassembled and a third suspension point and a fourth suspension point which are symmetrically arranged on the other side of the beam section to be disassembled, wherein the first suspension point corresponds to the third suspension point and forms a first suspension point group, the second suspension point corresponds to the fourth suspension point and forms a second suspension point group, the first suspension point group is distributed on one third of the beam section to be disassembled in the longitudinal direction, and the second suspension point group is distributed on two thirds of the beam section to be disassembled in the longitudinal direction.
In one embodiment, when the beam section to be detached to be cut is hoisted through the hoisting equipment, the cushion protection piece is additionally arranged at the edge of the outline of the beam section to be detached.
Compared with the prior art, the technical scheme of the invention at least has the following advantages and beneficial effects:
the invention plans the girder body longitudinally and sectionally according to the number of the piers, sets a temporary buttress to one side of the longitudinal bridge corresponding to each pier, cuts, hoists and adjusts the pier in sections, not only achieves the purposes of reducing noise, pollution and disturbance to the surrounding environment, but also reduces construction consumables while ensuring construction safety, reduces construction cost, is convenient and quick for the whole demolition construction, shortens construction period and reduces social influence.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the overall structural arrangement for dismantling a reinforced concrete continuous box girder overpass provided by an embodiment of the invention;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
fig. 3 is a schematic view of temporary buttress erection and beam segment hoisting to be dismantled provided by the embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating distribution of hanging points of a beam segment to be disassembled according to an embodiment of the present invention;
fig. 5 is a schematic distribution diagram of a hoisting perforation of a pier and a cutting surface of the pier provided by the embodiment of the invention.
Icon: 1-beam body, 11(11a/11b/11c/11d) -beam section to be dismantled, 111-flange plate, 112(112a/112b/112c/112d) -hoisting point, 12(12a/12b/12c) -cutting surface, 2(2a/2b/2c) -pier, 21-cutting surface of pier, 22-hoisting perforation, 3(3a/3b/3c) -temporary buttress, 4-bridge abutment structure, 5-lower line of bridge, 51-traffic road, 52-separation belt, 6-steel wire rope, 7-supporting structure, 8-sleeper and 9-cushion.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, a method for dismantling a reinforced concrete continuous box girder overpass bridge will be described more clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. The preferred embodiments of the dismantling method of the reinforced concrete continuous box girder overpass bridge are shown in the drawings, but the dismantling method of the reinforced concrete continuous box girder overpass bridge can be realized in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete in the context of a method of demolition of a reinforced concrete continuous box girder overpass.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, when used in reference to an orientation or positional relationship indicated in the drawings, or as otherwise customary for use in the practice of the invention, are used merely for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
In the description of the present invention, it should be further noted that the terms "disposed," "mounted," "connected," and "connected" used herein should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 5, an embodiment of the present invention provides a method for dismantling a reinforced concrete continuous box girder overpass, which is used for dismantling a pedestrian overpass on an expressway, specifically a reinforced concrete continuous box girder overpass including a girder 1 and a plurality of piers 2 below the girder 1, and the dismantling method includes the following steps:
s1, performing sectional planning on the beam body 1 along the longitudinal bridge direction (namely the longitudinal direction of the bridge), and dividing a plurality of beam sections 11 to be disassembled;
s2, setting up a temporary buttress 3 corresponding to one side of each pier 2 in the longitudinal direction, and determining a cutting surface 12 of the beam body 1 between each pier 2 and the corresponding temporary buttress 3 by taking each pier 2 and the corresponding temporary buttress 3 of each pier 2 as a group;
s3, determining a beam section to be detached 11 to be cut, hoisting and trapping the beam section to be detached 11 to be cut through hoisting equipment, cutting the beam section to be detached 11 trapped by hoisting and trapping along a cutting surface 12, wherein the beam section to be detached 11 to be cut is supported by temporary buttresses 3 at two ends of the beam section to be detached, or the temporary buttresses 3 at one end of the beam section to be detached and piers 2 at the other end of the beam section to be detached respectively, and after the hoisting equipment is stressed stably, the beam section to be detached 11 to be cut is hoisted and is adjusted away from the site by slowly applying force;
s4, dismantling the pier 2 and the temporary buttress 3 corresponding to the cut beam section 11 to be dismantled and adjusting away from the site;
and S5, repeating the steps S3 and S4 until the dismantling work of all the beam sections to be dismantled 11, the piers 2 and the temporary buttresses 3 is completed.
Further, as shown in fig. 1, when the abutment structures 4 are arranged on the two sides of the beam body 1, after the beam body 1, the pier 2 and the temporary buttress 3 are removed, the method further comprises a step S6, wherein the abutment structures 4 on the two sides of the bridge to be removed, the removed beam body 1 and the pier 2 are crushed by crushing equipment, and the construction slag generated in the crushing process is transported to a roadbed filling by a loader for layered filling, so that the waste materials are fully utilized, and the environmental protection concept is met.
It is understood that before step S1, construction preparation work, including traffic containment, should be performed; arranging a construction operation field, and clearing obstacles influencing the approach, station position, steering and the like of construction equipment in a construction area; confirming and detecting the states of hoisting equipment (in the embodiment, a crane is adopted as the hoisting equipment), crushing equipment (in the embodiment, a crusher is adopted as the crushing equipment) and cutting equipment (in the embodiment, an electric rope saw is adopted as the cutting equipment), so that the using requirements of hoisting, cutting and crushing can be met; confirming the state of a hoisting tool, wherein the hoisting tool comprises a steel wire rope, a shackle, a rope clamp and the like, and the hoisting tool is used after being detected to be qualified, and the hoisting tool has to be prepared completely; checking each hoisting point to meet the hoisting requirement, and clearing obstacles in a hoisting area; the traveling route of the crane is smooth, the requirement of entering a field is met, the warning belt is pulled in an operation area, no related personnel are strictly prohibited to stay, and the like.
Specifically, in step S1, the girder 1 is planned in sections according to the structural form of the overpass, specifically, the girder 1 is planned in sections according to the number of piers 2 distributed along the longitudinal direction of the overpass, generally speaking, the lower bridge route 5 spanned by the overpass includes a plurality of groups of traffic roads 51 arranged in parallel and a division strip 52 between two adjacent groups of traffic roads 51, and in order not to affect traffic, the piers 2 in the overpass are usually arranged in the division strip 52. As shown in fig. 1, the passenger footbridge in the present embodiment crosses two sets of traffic roads 51, which have three piers 2, including a second pier 2b in a division strip 52 and a first pier 2a and a third pier 2c on both sides of a bridge lower line 5, so that the girder body 1 can be divided into 4 girder segments to be disassembled 11, i.e., a first girder segment to be disassembled 11a, a second girder segment to be disassembled 11b, a third girder segment to be disassembled 11c, and a fourth girder segment to be disassembled 11 d. The second beam section to be disassembled 11b and the third beam section to be disassembled 11c are used as span line middle beam sections to cover above the bridge lower line 5, and the first beam section to be disassembled 11a and the fourth beam section to be disassembled 11d are used as span line outer beam sections to be distributed on two sides of the bridge lower line 5.
In step S2, the temporary buttresses 3, namely the first temporary buttress 3a, the second temporary buttress 3b and the third temporary buttress 3c, are respectively erected corresponding to the first pier 2a, the second pier 2b and the third pier 2c by crane hoisting, as shown in fig. 2 and fig. 3, the upper end of the temporary buttress 3 is fixedly connected with the supporting structure 7 by welding or bolts, and is abutted against the lower end face of the beam body 1 by the supporting structure 7, and the supporting structure 7 exceeds the lower end face of the beam body 1 in the transverse bridge direction (i.e. the transverse direction of the bridge) so as to improve the anti-overturning performance when the beam body 1 is subsequently supported; in the embodiment, the steel pipe column is used as the temporary buttress 3, and a plurality of sections of parallel I-shaped steel which are fixedly connected with each other are used as the supporting structure 7 for supporting, so that the steel pipe column is convenient and quick to manufacture, install and disassemble; in addition, a steel plate with the area larger than the cross section of the steel pipe column can be welded at the lower end part of the temporary buttress 3, so that the overturn prevention performance of the temporary buttress 3 is further improved; a sleeper 8 is further interposed between the support structure 7 and the beam body 1, and the support structure 7 is abutted against the lower end face of the beam body 1 through the sleeper 8, so that sufficient displacement resistance is provided by the sleeper 8, and the anti-cushioning performance of the temporary buttress 3 is further improved. Preferably, the temporary buttresses 3 (i.e., the first temporary buttresses 3a and the third temporary buttresses 3c) on both sides of the bridge lower line 5 are disposed inside their corresponding piers 2, i.e., near the side of the bridge lower line 5, to facilitate the erection of the temporary piers 2.
Subsequently, a cutting surface 12 of the first beam section to be disassembled 11a and the second beam section to be disassembled 11b, namely a first cutting surface 12a, is determined between the first pier 2a and the first temporary buttress 3a, a cutting surface 12 of the second beam section to be disassembled 11b and the third beam section to be disassembled 11c, namely a second cutting surface 12b, is determined between the second pier 2b and the second temporary buttress 3b, and a cutting surface 12 of the third beam section to be disassembled 11c and the fourth beam section to be disassembled 11d, namely a third cutting surface 12c, is determined between the third pier 2c and the third temporary buttress 3 c; the cutting surfaces 12 can be popped out linearly through drawing lines or with powder, and the three cutting surfaces 12 are perpendicular to the longitudinal bridge direction, so that the shape of the beam body 1 is regular after being cut, and the subsequent hoisting stress is ensured to be uniform.
In step S3, a cross-line middle beam section (i.e., the second to-be-dismounted beam section 11b and the third to-be-dismounted beam section 11c) is determined as to-be-dismounted beam section 11 to be cut, a crane is respectively arranged on each of the two groups of traffic roads 51, and the second to-be-dismounted beam section 11b and the third to-be-dismounted beam section 11c are hoisted at the same time on different sides, as shown in fig. 3 and 4, when the to-be-dismounted beam section 11 to be cut is hoisted by hoisting equipment, four hoisting points 112 are symmetrically arranged on the flange plates 111 on two sides of the cross bridge of the to-be-dismounted beam section 11 to be dismounted, the to-be-dismounted beam section 11 is hoisted by passing through the hoisting points 112 along the cross bridge direction through two steel wire ropes 6, and a pad protection member 9 such as a rubber is additionally arranged at a position where the steel wire rope 6 contacts with the to-be-dismounted beam section 11, i.e., a contour edge of. As shown in fig. 4, the four hanging points 112 include a first hanging point 112a and a second hanging point 112b located on one side of the beam section 11 to be disassembled, and a third hanging point 112c and a fourth hanging point 112d symmetrically arranged on the other side of the beam section 11 to be disassembled, wherein the first hanging point 112a corresponds to the third hanging point 112c and forms a first hanging point group, the second hanging point 112b corresponds to the fourth hanging point 112d and forms a second hanging point group, a strand of steel wire rope 6 is arranged at the first hanging point group to hold the beam section 11 to be disassembled, another steel wire rope 6 is arranged at the second hanging point group to hold the beam section 11 to be disassembled, the beam section 11 to be disassembled is fixed by a crane and a rope clamp, and the beam section 11 to be disassembled is hung by hooking two strands of steel wire ropes 6 at the same time; preferably, the first hoisting point component is distributed at one third of the longitudinal bridge of the beam section 11 to be dismantled, and the second hoisting point component is distributed at two thirds of the longitudinal bridge of the beam section 11 to be dismantled, so as to balance the hoisting stress of the beam section 11 to be dismantled.
Then, simultaneously cutting the second beam section to be disassembled 11b and the third beam section to be disassembled 11c along the first cutting surface 12a, the second cutting surface 12b and the third cutting surface 12c, and laying straw mats on a road below the cutting surfaces 12 to receive the fallen residues during cutting; the second beam section to be dismantled 11b is respectively supported by the first temporary buttress 3a of one end and the second temporary buttress 3b of the other end after being cut, and the third beam section to be dismantled 11c is respectively supported by the second pier 2b of one end and the third temporary buttress 3c of the other end after being cut, and after the crane is stressed stably, the cut beam section to be dismantled 11 is lifted and is adjusted away from the site by the slow force, so that the dismantling of the middle beam section of the span line is completed. At this time, only the second pier 2b and the second temporary pier 3b exist inside the bridge lower line 5, so that partial traffic can be temporarily recovered after the bridge lower line 5 is cleaned, and social influence is reduced.
In step S4, the second pier 2b is removed by cutting, as shown in fig. 5, before cutting, a hoisting through hole 22 is formed at the upper end of the second pier 2b, the hoisting through hole 22 is drilled by a steel wire rope 6 to hoist the second pier 2b, then the cutting surface 21 of the pier is determined at the lower end of the second pier 2b to be cut, and the cut pier is lifted and transported out of the construction site by a crane; the second temporary buttress 3b is directly disassembled based on the installation mode, and then lifted and transported out of the construction site through a crane. When cutting the second pier 2b, since it is not necessary to consider the passage in the isolation zone, the pier cut surface of the second pier 2b may be determined to be a portion higher than the ground surface by 30CM, and not higher than the isolation zone.
And then, repeating the steps S3 and S4, hoisting, cutting and dismantling the first beam section to be dismantled 11a, the fourth beam section to be dismantled 11d, the first pier 2a and the third pier 2c, correspondingly dismantling the first temporary buttress 3a and the third temporary buttress 3c, hoisting and transporting the first beam section to be dismantled, the fourth pier 2a and the third pier 3c out of the construction site through a crane, completing the dismantling work of all the beam sections to be dismantled 11, the piers 2 and the temporary buttress 3, and clearing the lower line 5 of the bridge to comprehensively open the traffic. When the first pier 2a and the third pier 2c are hoisted, the same hoisting method as that of the second pier 2b is also adopted. When the first pier 2a is cut, excavating to the top of a pile foundation along the circumferential surface of the first pier 2a, selecting a pier cutting surface of the first pier 2a at a position 0.3-1.5 meters above the top surface of the pile foundation to enable the pier cutting surface to be lower than the ground, and filling and leveling an excavation foundation pit after the first pier 2a is removed from the site; similarly, when the third pier 2c is cut, the same removal method as that of the first pier 2a is adopted.
In step S6, when the abutment structures 4 are disposed on the two sides of the beam 1, the beam 1 is cut at the end portion overlapping the abutment structure 4, and the beam 1 is supported by the abutment structure 4, that is, the first beam section to be disassembled 11a is cut and then supported by the first pier 2a at one end and the abutment structure 4 at the other end, respectively, the fourth beam section to be disassembled 11d is cut and then supported by the third pier 2c at one end and the abutment structure 4 at the other end, respectively, and after the crane is subjected to a stable stress, the cut beam section to be disassembled 11 is lifted and lifted away from the site by a slow force, thereby completing the disassembly of the beam section outside the span line. And then, crushing the abutment structures 4 at two sides and the cut abandoned beams and pier columns by using a crusher, conveying the construction slag generated in the crushing process to a roadbed filling for layered filling, and conveying the redundant construction slag away by using a loading vehicle.
The whole bridge dismantling process not only achieves the purposes of low noise and low pollution, but also can adopt the existing building materials and equipment for construction, achieves the purposes of less construction material consumption and low construction cost, is convenient and quick for the whole dismantling construction, shortens the construction period, and avoids social influence caused by long-time traffic interruption.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for dismantling a reinforced concrete continuous box girder overpass bridge, which comprises a girder body and a plurality of piers at the lower side of the girder body, is characterized by comprising the following steps:
s1, performing sectional planning on the beam body along the longitudinal bridge direction, and dividing a plurality of beam sections to be disassembled;
s2, setting up temporary buttresses on one side of each pier in the longitudinal direction of the longitudinal bridge, and determining the cutting surface of the beam body between each pier and the corresponding temporary buttresses in each group by taking each pier and the corresponding temporary buttresses as a group;
s3, determining a beam section to be detached to be cut, hoisting and pocketing the beam section to be detached to be cut through hoisting equipment, cutting the beam section to be detached which is pocketed and hoisted along the cutting surface, wherein the beam section to be detached to be cut is supported by temporary buttresses at two ends of the beam section to be detached or a temporary buttress at one end of the beam section and a pier at the other end of the beam section to be detached respectively, and after the hoisting equipment is stressed stably, hoisting the beam section to be detached to be cut and adjusting away from the site by slowly applying force;
s4, dismantling the pier and the temporary pier corresponding to the cut beam section to be dismantled and adjusting away from the site;
and S5, repeating the steps S3 and S4 until the dismantling work of all the beam sections to be dismantled, the piers and the temporary buttresses is completed.
2. The demolition method of a reinforced concrete continuous box girder overpass according to claim 1, further comprising, after demolishing a girder, a pier, and a temporary buttress, when abutment structures are provided at both sides of the girder:
and S6, crushing abutment structures on two sides of the bridge to be disassembled, the disassembled beam body and the pier, and conveying the building slag generated in the crushing process to roadbed filling for layered filling.
3. The dismantling method of the reinforced concrete continuous box girder overpass bridge according to claim 1 or 2, wherein the girder section to be dismantled covering the lower line of the bridge among the plurality of girder sections to be dismantled is a middle girder section of the overpass, and the girder sections to be dismantled on both sides of the lower line of the bridge are outer girder sections of the overpass; in step S3, the cross-line middle beam section is cut as the beam section to be detached.
4. The demolition method of a reinforced concrete continuous box girder overpass bridge according to claim 3, wherein the lower line of the bridge comprises a plurality of sets of traffic roads arranged in parallel and a division strip between two adjacent sets of traffic roads, and the middle beam section of the overpass is supported by piers arranged in the division strip; when the middle beam section of the span line is cut, the beam sections to be dismantled distributed on the traffic road are hoisted, cut, hoisted and separated at the same time.
5. The demolition method of a reinforced concrete continuous box girder overpass bridge according to claim 1 or 2, wherein the upper end portion of the temporary buttress is provided with a support structure, the support structure abuts against the lower end face of the girder body, and the support structure exceeds the lower end face of the girder body in the transverse bridge direction.
6. The demolition method of a reinforced concrete continuous box girder overpass bridge according to claim 5, wherein a sleeper is further interposed between the support structure and the girder body, and the support structure abuts against the lower end surface of the girder body through the sleeper.
7. The method for dismantling the reinforced concrete continuous box girder overpass bridge according to claim 1 or 2, wherein the cutting plane is perpendicular to the longitudinal bridge direction.
8. The method for dismantling the reinforced concrete continuous box girder overpass bridge according to claim 1 or 2, wherein when the to-be-dismantled girder section to be cut is hoisted by the hoisting equipment, four hoisting points are symmetrically arranged on the flange plates at two sides of the to-be-dismantled girder section in the transverse bridge direction, and the bottom of the to-be-dismantled girder section is hoisted by passing through the hoisting points along the transverse bridge direction through two steel wire ropes.
9. The demolition method of a reinforced concrete continuous box girder overpass bridge according to claim 8, wherein the four hoisting points comprise a first hoisting point and a second hoisting point located at one side of the beam section cross bridge to be demolished, and a third hoisting point and a fourth hoisting point symmetrically arranged at the other side of the beam section cross bridge to be demolished, wherein the first hoisting point corresponds to the third hoisting point and forms a first hoisting point group, the second hoisting point corresponds to the fourth hoisting point and forms a second hoisting point group, the first hoisting point group is distributed at one third of the beam section longitudinal bridge to be demolished, and the second hoisting point group is distributed at two thirds of the beam section longitudinal bridge to be demolished.
10. The method for dismantling the reinforced concrete continuous box girder overpass bridge according to claim 8, wherein when the to-be-dismantled beam section to be cut is hoisted by hoisting equipment, a cushion is additionally arranged at the edge of the outline of the to-be-dismantled beam section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110402477.2A CN113089510A (en) | 2021-04-14 | 2021-04-14 | Method for dismantling reinforced concrete continuous box girder overpass bridge |
Applications Claiming Priority (1)
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| CN113774821A (en) * | 2021-08-28 | 2021-12-10 | 中交一公局集团有限公司 | Bridge disassembling process |
| CN114032797A (en) * | 2021-11-15 | 2022-02-11 | 广东省交通规划设计研究院集团股份有限公司 | T-shaped beam dismantling method |
| CN114214976A (en) * | 2022-01-27 | 2022-03-22 | 中铁二十二局集团第三工程有限公司 | Concrete bridge flange dismantling construction method and cantilever device |
| CN114508057A (en) * | 2022-03-08 | 2022-05-17 | 中国建筑第六工程局有限公司 | Method for dismantling small concrete T-beam type bridge crossing obstacles |
| CN114808773A (en) * | 2022-03-23 | 2022-07-29 | 广西北投交通养护科技集团有限公司 | Construction method for fast breaking and dismantling masonry arch bridge based on bridge floor cutting |
| CN115748418A (en) * | 2022-11-25 | 2023-03-07 | 广州机施建设集团有限公司 | Forest trestle construction method |
| CN117188347A (en) * | 2023-08-08 | 2023-12-08 | 中国铁建港航局集团有限公司 | Through bridge dismounting method |
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|---|---|---|---|---|
| CN113774821A (en) * | 2021-08-28 | 2021-12-10 | 中交一公局集团有限公司 | Bridge disassembling process |
| CN114032797A (en) * | 2021-11-15 | 2022-02-11 | 广东省交通规划设计研究院集团股份有限公司 | T-shaped beam dismantling method |
| CN114214976A (en) * | 2022-01-27 | 2022-03-22 | 中铁二十二局集团第三工程有限公司 | Concrete bridge flange dismantling construction method and cantilever device |
| CN114508057A (en) * | 2022-03-08 | 2022-05-17 | 中国建筑第六工程局有限公司 | Method for dismantling small concrete T-beam type bridge crossing obstacles |
| CN114808773A (en) * | 2022-03-23 | 2022-07-29 | 广西北投交通养护科技集团有限公司 | Construction method for fast breaking and dismantling masonry arch bridge based on bridge floor cutting |
| CN114808773B (en) * | 2022-03-23 | 2022-12-02 | 广西北投交通养护科技集团有限公司 | Construction method for fast breaking and dismantling masonry arch bridge based on bridge floor cutting |
| CN115748418A (en) * | 2022-11-25 | 2023-03-07 | 广州机施建设集团有限公司 | Forest trestle construction method |
| CN117188347A (en) * | 2023-08-08 | 2023-12-08 | 中国铁建港航局集团有限公司 | Through bridge dismounting method |
| CN117188347B (en) * | 2023-08-08 | 2024-03-29 | 中国铁建港航局集团有限公司 | Through bridge dismounting method |
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