CN114150593A - Simple arch bridge dismantling and rebuilding structure and arch bridge dismantling and rebuilding method - Google Patents
Simple arch bridge dismantling and rebuilding structure and arch bridge dismantling and rebuilding method Download PDFInfo
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- CN114150593A CN114150593A CN202111540252.XA CN202111540252A CN114150593A CN 114150593 A CN114150593 A CN 114150593A CN 202111540252 A CN202111540252 A CN 202111540252A CN 114150593 A CN114150593 A CN 114150593A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010276 construction Methods 0.000 claims abstract description 58
- 238000004873 anchoring Methods 0.000 claims abstract description 33
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 239000004567 concrete Substances 0.000 claims description 22
- 238000013461 design Methods 0.000 claims description 16
- 238000011065 in-situ storage Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 10
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- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
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- 238000012360 testing method Methods 0.000 claims description 4
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- 239000000463 material Substances 0.000 abstract description 3
- 238000009417 prefabrication Methods 0.000 abstract description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a simple arch bridge dismantling and rebuilding structure and a method thereof, the simple arch bridge dismantling and rebuilding structure comprises: the anchoring systems are arranged on two sides of the river channel; the tower corresponds to the anchoring system and is arranged on one side of the anchoring system close to the river channel; and two ends of a main cable of the cable structure respectively penetrate through main cable saddles corresponding to the tops of the towers, are supported by the main cable saddles and then are fixedly connected with anchoring systems on two sides of the river channel. The anchoring system comprises anchor piles, a sliding beam and rear anchors, the sliding beam is connected with the anchor piles at two ends, and the sliding beam is provided with the slidable rear anchors. When the arch bridge is dismantled and rebuilt, the method of dismantling part of original bridges, namely rebuilding part of bridges is adopted, the original bridge structure is fully utilized, the original bridge abutment is reinforced to serve as a newly-built bridge abutment, a large amount of manpower and material resources are saved, meanwhile, the original bridge arch ribs are utilized to participate in stress, the box type arch is assembled through prefabrication, the construction period is greatly shortened, and time and labor are saved.
Description
Technical Field
The invention belongs to the field of bridge construction and construction, and relates to a simple arch bridge dismantling and rebuilding structure and an arch bridge dismantling and rebuilding method.
Background
Since the last century, arch bridges have been widely used in China due to their features of beauty, simplicity of construction, etc. At present, many old arch bridges cannot meet the requirements of high efficiency and safety of road traffic and even normal traffic requirements, and the old arch bridges are dismantled and rebuilt to solve the problem urgently. Bridge demolishs not only can influence peripheral regional traffic, peripheral building, and improper handling still can the polluted environment, still can face various dangerous and uncertain factors in the bridge demolishs process simultaneously, consequently sets up safety protection facility protection constructor personal safety, and the biggest dynamics reduces the pollution and becomes the important factor that the construction must be considered. The traditional bridge demolition method can be divided into a blasting demolition method, a mechanical demolition method and a static crushing demolition method, wherein the blasting demolition method is high in construction speed, short in construction period, low in manpower consumption and high in efficiency, but high in cost, low in safety factor and large in environmental impact; the mechanical dismantling method has small influence on the environment, can control the construction range, has safer dismantling process, can simultaneously carry out the dismantling operation and the crushing operation, has high dismantling speed and low cost, but needs to set up a bracket and is not suitable for deep water and water areas with high water urgency; the static breaking agent removing method does not generate vibration and flying stones, is safe, but has limited breaking capacity, can not effectively remove structures with overlarge strength, and has long removing time. Therefore, it is of practical significance to find a construction method which can safely remove the construction site and shorten the reconstruction period. And the inventor of the invention finds that the prior art has the following problems:
1. the construction method adopts the construction steps of firstly dismantling and then rebuilding, so that the construction period is greatly prolonged, meanwhile, the construction method is complex, a large amount of labor and templates are needed when the full-scale support is built, and the construction cost is increased; the river needs to be cut off, so that a water source along a river basin is blocked, the water source along the river basin is polluted, and the development requirements of energy conservation and environmental protection advocated by the state are not met;
2. all stress of the demolition method is borne by a newly-built structure, and a newly-built bridge needs to be stabilized by various methods, so that time and labor are wasted; the dismantling method can greatly affect the environment, generate larger noise and more raised dust; a large number of crushing structures fall off the river channel by a mechanical crushing method or a blasting method, so that the river channel is polluted;
3. at present, large machinery required by traditional bridge dismantling is not suitable for special engineering environments in fields, such as environments with inconvenient traffic, narrow construction space and the like in remote mountain areas and the like.
Disclosure of Invention
The embodiment of the invention aims to provide a simple arch bridge dismantling and rebuilding structure, which aims to solve the problems that a full-hall support needs to be erected, large machinery needs to be built and the structure is complex in the existing construction structure.
Another object of the embodiments of the present invention is to provide a method for dismantling and rebuilding an arch bridge, so as to solve the problems of long construction period, high cost and easy environmental pollution of the existing construction method.
The technical scheme adopted by the embodiment of the invention is as follows: the reconstruction structure is simply demolishd to arched bridge includes:
the anchoring systems are arranged on two sides of the river channel;
the tower corresponds to the anchoring system and is arranged on one side of the anchoring system close to the river channel;
and two ends of a main cable of the cable structure respectively penetrate through main cable saddles corresponding to the tops of the towers, are supported by the main cable saddles and then are fixedly connected with anchoring systems on two sides of the river channel.
Further, the anchor system includes anchor pile, skid beam and back anchor, wherein:
the anchor piles on both ends are connected to the sliding beam, and slidable back anchors are installed on the sliding beam.
Further, the anchor pile, the sliding beam and the rear anchor are all of reinforced concrete structures formed by cast-in-place;
a main cable of a cable structure is fixed on the rear anchor;
a sliding plate is embedded in the sliding beam, and the rear anchor is connected with the sliding plate in a sliding mode.
Furthermore, windlasses are respectively arranged at anchor piles of the anchoring systems positioned at two sides of the river channel;
transversely be provided with two twisted steel in the back anchor, wherein:
two ends of each of the two threaded steel bars are fixedly connected with the end part of the steel wire rope wound on the winch after penetrating through the anchor piles on the two sides correspondingly, and the winch at the two anchor piles rotates in the reverse direction and can transversely move after being pulled by the two threaded steel bars.
Further, the tower comprises a tower foundation and a tower body on the tower foundation, wherein:
the tower foundation is a reinforced concrete structure formed by cast-in-place;
the tower body is formed by assembling universal rod pieces, and a cable wind cable is arranged on the tower body.
Furthermore, a transverse moving rail is arranged at the top of the tower body of the tower frame, and rollers at the bottom of the traction flat car are positioned in the transverse moving rail and can roll along the transverse moving rail to drive the traction flat car to move;
the main cable saddle is fixed on the traction flat car;
and two ends of the traction flat car are connected with two winches on the ground through traction ropes, and the two winches are used for driving the traction flat car to move along the transverse moving track.
The embodiment of the invention adopts another technical scheme that: the arch bridge demolishing and rebuilding method adopts the arch bridge simple demolishing and rebuilding structure and comprises the following steps:
step S1: carrying out overall safety evaluation on the original bridge, reinforcing the maximum stress position and the weak bearing position of the original bridge, and arranging a joint reinforcing steel bar at the connecting part of the box-type arch and the abutment;
step S2: prefabricating box type arches, arch-upper vertical walls, capping beams, sidewalk boards, bridge decks and guardrails, dividing the whole box type arch into a plurality of box type arch blocks, reserving joint reinforcing steel bars at the joints of two adjacent box type arch blocks, and reserving joint reinforcing steel bars connected with the arch-upper vertical walls on the box type arch blocks for installing the arch-upper vertical walls;
step S3: mounting an arch bridge, and simply dismantling and rebuilding a structure;
step S4: dismantling bridge deck guardrails, sidewalks, bridge deck pavements, and bridge decks of the I-type beams and the III-type beams of the original bridge by a cutting method;
step S5: installing box-type arches at the I-beam and the III-beam respectively in the direction from the two ends of the abutment to the center of the bridge, and enabling each prefabricated box-type arch block to be connected with an old arch in the installation process so as to transmit partial load of the box-type arches to the old arch;
step S6: according to the construction method of the step S4, removing the bridge deck and the transverse beam of the beam II, removing all old arches of the original bridge, and connecting the beam I with the box arch at the beam III by adopting a transverse connecting beam;
step S7: installing an arch vertical wall according to the bridge design file;
step S8: sequentially mounting bent caps on the arch vertical wall in the direction from the abutment to the center of the bridge;
step S9: installing a rubber support on the bent cap, hoisting the bridge deck to the rubber support of the bent cap through a lifting appliance, and finishing the erection of all bridge decks on the bent cap according to the direction from two sides of the abutment to the center of the bridge;
step S10: paving bridge deck pavement, sidewalk boards, guardrails and expansion joints;
step S11: and (4) simply dismantling and rebuilding the built arch bridge.
Further, the specific operation of step S3 is as follows:
step S31: installing anchoring systems on two sides of a river channel, pouring a tower foundation of a tower frame on a construction site, assembling a tower body, transporting and installing universal rod pieces of the tower body in place by using derrick cranes, and manually installing bolts for assembling;
step S32: after the tower body is assembled, front, back and side cable wind cables of the tower are installed, and the front and back cable wind cables of the tower are adjusted to enable the tower to reach the designated sag;
step S33: installing a tower frame transverse moving rail and a main cable saddle;
step S34: two ends of a main cable of the cable structure penetrate through a main cable saddle corresponding to the top of the tower and then are fixed on an anchoring system;
step S35: installing a traction cable, wherein two ends of the traction cable are fixed on a winch which is fixed below the tower and used for drawing the traction cable;
step S36: the upper part of the sports car is connected with a main cable through a pulley, the lower part of the sports car is fixedly connected with a traction cable, a hoisting cable is arranged below the sports car, and a lifting appliance is arranged below the hoisting cable;
step S37: the cable system is used for trial hoisting, and the sports car is repeatedly carried in no-load mode, is used for static test hoisting and is operated in hoisting weight mode.
Further, the specific operation of step S5 is as follows:
step S51: hoisting a prefabricated box type arch block by using a lifting appliance, carrying out cast-in-place pouring on a beam I and a beam III respectively from an abutment by binding joint reinforcing steel bars on the box type arch block and joint reinforcing steel bars on the abutment, maintaining the cast-in-place position and dismantling a scaffold and a template after the pouring is finished, and completing the connection between the box type arch and the abutment after cast-in-place concrete reaches the design strength;
step S52: hoisting a temporary construction platform and workers to a prefabricated box arch through a lifting appliance, connecting the box arch with an old arch by using structures such as square steel, lock catches and the like, and transmitting partial load of the box arch to the old arch;
step S53: installing other box-type arch blocks at the first beam and the third beam respectively according to the directions from the two ends of the bridge abutment to the center of the bridge, binding joint reinforcing steel bars of the two adjacent parts of the box-type arch blocks, conveying concrete through concrete conveying stations at the two sides of the bridge abutment to cast in situ the joint reinforcing steel bars of the two adjacent parts of the bound box-type arch blocks until box-type arches at the first beam and the third beam are folded at a midspan, and maintaining and dismantling templates at all the cast-in-situ positions of the box-type arch blocks after casting is finished;
step S54: and (5) after the cast-in-place concrete in the step S53 reaches the design strength, removing the square steel and the lock catch between the prefabricated box type arch and the old arch.
Further, the specific operation of step S7 is as follows:
according to a bridge design file, reserving joint reinforcing steel bars of an arch vertical wall at the designated positions of partial box arch blocks of a box arch, binding the arch vertical wall with the joint reinforcing steel bars reserved at the designated positions of the partial box arch blocks of the box arch, then casting the binding part in situ, and casting according to the casting sequence from abutment platforms at two sides to the direction of the center of the bridge; the pouring mode adopts a mode of building a template by virtue of joint steel bars, and concrete is cast in situ by virtue of concrete conveying stations on two sides of the abutment; after pouring is completed, maintaining and removing the template for the cast-in-place arch vertical wall, and after the No. I beam and the No. III beam arch vertical wall reach the strength, completing the installation of the arch vertical wall;
the specific operation of step S8 is as follows:
hoisting the prefabricated bent cap to the arch vertical wall through a hoisting tool without withdrawing the hoisting tool, erecting a template through joint reinforcing steel bars reserved on the arch vertical wall and joint reinforcing steel bars at the bottom end of the bent cap, and pouring a joint section; and after the pouring is finished, maintaining the cast-in-place section, dismantling the template, and after the cover beams on the I beam and the III beam and the joint sections of the arch vertical walls reach the strength, erecting the cover beams.
The embodiment of the invention has the beneficial effects that:
1. the method for rebuilding the partial bridge by dismantling part of original bridges is adopted, and meanwhile, the box-type arches are completed through prefabrication and assembly, so that compared with the method for rebuilding the bridge after dismantling all the original bridges in the prior art, the construction period is greatly shortened, and the problem that the construction period is long due to the adoption of the construction steps of dismantling and rebuilding firstly in the conventional construction method is solved.
2. In the process of dismantling and rebuilding, the original bridge structure is fully utilized, the original bridge abutment is reinforced to serve as a newly-built bridge abutment, a large amount of manpower and material resources are saved, meanwhile, the arch ribs of the original bridge are utilized to participate in stress, the newly-built bridge is not required to be stabilized by utilizing buckling ropes, and time and labor are saved; the newly-built bridge and the original bridge are stressed in a coordinated manner in the construction process, a support does not need to be built in all the construction processes, the original bridge is not dismantled and rebuilt by using the blasting technology, an excessive crushing structure cannot be generated, the noise is low, the flying dust is less, great influence on surrounding residents and buildings cannot be generated, and the protection along a river basin is furthest realized; the construction process is simplified, and the construction cost is reduced. Effectively solves the problems of high cost and easy environmental pollution of the existing construction method.
3. The utility model provides a pair of arch bridge simply demolishs and rebuilds structure need not use large-scale construction equipment for adopting the construction structures of cable hoist and mount, also need not set up full hall support, and simple structure can demolish fast, and reuse rate is high, and is with low costs, can be used to the special environment that traffic is inconvenient, construction space is little, has solved current construction structure and need set up full hall support and large-scale machinery, the problem that the structure is complicated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic side view of an arch bridge easy-to-remove reconstruction structure according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of an anchoring system of an embodiment of the present invention.
FIG. 3 is a cross-sectional schematic view of an anchoring system of an embodiment of the present invention.
Fig. 4 is a schematic top view of the original bridge.
Fig. 5 is a schematic top view of an arch bridge structure with deck and diaphragm removed from beams i and iii.
FIG. 6 is a schematic top view of a box arch closure.
Fig. 7 is a schematic top view of the bridging.
Fig. 8 is a side view schematic of the bridging.
Fig. 9 is a cross-sectional view of the main beam I-I of the bridge.
Fig. 10 is a cross-sectional view of the main beam II-II of the bridge.
In the figure, 1, an original bridge, 2, an anchoring system, 3, a main cable saddle, 4, a cable wind cable, 5, a tower, 6, a main cable, 7, a traction cable, 8, a sports car, 9, a lifting cable, 10, a lifting appliance, 11, an anchor pile, 12, a sliding beam, 13, a rear anchor, 14, a sliding plate, 15, a main cable anchoring point, 16, a sliding block, 17, a steel bar hole channel, 18, an old arch, 19, a transverse beam, 20, a box-shaped arch, 21, square steel, 22, a cover beam, 23, an arch-on vertical wall, 24, a transverse connecting beam and 25, a rubber support.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Example 1
An embodiment of the present invention provides an arch bridge demolishing and rebuilding structure, as shown in fig. 1, including:
the anchoring system 2 is arranged on two sides of the river channel;
the tower 5 is corresponding to the anchoring system 2 and is arranged on one side, close to the river channel, of the anchoring system 2;
two ends of a main cable 6 of the cable structure respectively penetrate through a main cable saddle 3 corresponding to the top of the tower 5 and are fixedly connected with anchoring systems 2 on two sides of a river channel after being supported by the main cable saddle 3.
Further, the anchoring system 2 comprises anchor piles 11, skid beams 12 and rear anchors 13, as shown in fig. 2, wherein:
the sliding beam 12 is connected with the anchor piles 11 on two ends, and the sliding beam 12 is provided with a slidable rear anchor 13.
Furthermore, a sliding plate 14 is embedded in the sliding beam 12, and the rear anchor 13 is connected with the sliding plate 14 in a sliding manner.
Further, the anchor pile 11, the sliding beam 12 and the rear anchor 13 are all made of reinforced concrete structure cast in situ, the main cable 6 of the cable structure is fixed on the rear anchor 13, and the main cable 6 is fixed at the main cable anchoring point 15 on the rear anchor 13, as shown in fig. 3.
Further, anchor piles 11 of the anchoring system 2 located on two sides of the river channel are respectively provided with a winch, two threaded steel bars are transversely arranged in the rear anchor 13 and located in a steel bar hole 17 shown in fig. 3, two ends of each threaded steel bar are respectively and correspondingly connected with the end portions of steel wire ropes wound on the winches after penetrating through the anchor piles 11 on two sides, and when the rear anchor 13 needs to move transversely, the winches on the two anchor piles 11 rotate in opposite directions (namely, forward rotation and reverse rotation are achieved, one winch tightens up the steel wire ropes, the other winch loosens the steel wire ropes), so that the anchor piles 13 move transversely after being pulled by the two threaded steel bars.
The tower 5 comprises a tower foundation and a tower body on the tower foundation, the tower foundation is of a reinforced concrete structure formed by casting in situ, and the tower body is formed by assembling universal rod pieces.
Furthermore, a transverse rail is arranged at the top of the tower body of the tower 5, rollers at the bottom of the traction flat car are located in the transverse rail and can roll along the transverse rail to drive the traction flat car to move, the main cable saddle 3 is fixed on the traction flat car, two ends of the traction flat car are connected with two winches which are used for driving the traction flat car to move along the transverse rail on the ground through traction ropes, the two winches rotate reversely to achieve transverse movement of the main cable saddle 3, when the main cable saddle 3 needs to be fixed, the main cable saddle 3 is arranged to move so as to block the traction flat car through fixedly connecting baffles arranged at two sides of the main cable saddle 3 with the tower 5, and the purpose of adapting to hoisting of arch ribs on different axes is achieved, construction cost is reduced, and construction difficulty is reduced.
Further, a cable wind cable 4 is arranged on the tower body of the tower 5, the cable wind cable 4 is used for adjusting and fixing the position of the tower 5, the ground part of the cable wind cable 4 is connected with a fixed ground anchor of the cable wind cable, and the upper part of the cable wind cable 4 is connected with a universal rod piece of the tower body of the tower 5 through a buckle lock.
Further, the cable system comprises a main cable 6, a traction cable 7, a running car 8, a hoisting cable 9 and a lifting appliance 10, wherein the main cable 6 is used for bearing the hoisting weight of the cable, the traction cable 7 is arranged below the main cable 6 and is parallel to the main cable 6, the traction cable 7 is used for drawing the running car 8 to move, the upper part of the running car 8 is connected with the main cable through a pulley, and the lower part of the running car 8 is fixedly connected with the traction cable 7; the lifting rope 9 is arranged at the bottom of the sports car 8 and used for moving the lifting appliance 10 up and down; and a hoist 10 mounted on the hoist rope 9 for hanging a hoist.
Example 2
The arch bridge demolishing and rebuilding method of the embodiment of the invention adopts the arch bridge simple demolishing and rebuilding structure of the embodiment 1, and is carried out according to the following steps:
step S1: the overall safety of the original bridge is evaluated on the construction site, and the required structural data is obtained, so that the bridge design at the later stage is facilitated; finite element software such as Midas and ANSYS is utilized to carry out modeling calculation on the original bridge to obtain the maximum stress position and the weak bearing position of the original bridge, and the maximum stress position and the weak bearing position (such as the inner side of a bridge abutment close to a river) of the original bridge are reinforced to prevent the influence of construction disturbance on the whole bridge in the construction process; drilling a hole at the connecting part of the box-shaped arch 20 and the abutment by using a drilling machine, pouring a mixture of epoxy resin and a reinforcing steel bar adhesive into the hole, and then inserting a joint reinforcing steel bar to provide conditions for connecting the box-shaped arch 20 and the abutment; simultaneously, cast-in-place reinforcement is carried out on the connecting part of the old arch 18 and the abutment;
step S2: prefabricating a box-type arch 20, an arch-up vertical wall 23, a bent cap 22, a sidewalk slab, a bridge deck slab and a guardrail; dividing the whole box-type arch 20 into a plurality of box-type arch blocks, reserving joint reinforcing steel bars at the joint of two adjacent box-type arch blocks, and reserving joint reinforcing steel bars connected with the arch-top vertical wall 23 on the box-type arch blocks for installing the arch-top vertical wall 23; the arch-up vertical wall 23 is prefabricated according to the height between the abutment and the position of the box-type arch 20 where the arch-up vertical wall 23 is arranged; the sidewalk plate, the guardrail and the bent cap 22 are prefabricated according to the design size; the deck slab is set up and prefabricated the size according to the bent cap 22 interval; all the design sizes and the prefabricating process are carried out according to general standard for designing bridges and culverts of highways;
step S3: the simple and easy reconstruction structure of demolising of installation arch bridge specifically is as follows:
step S31: installing anchoring systems 2 on two sides of a river channel, pouring a tower foundation of a tower 5 on a construction site, assembling a tower body, transporting and installing universal rods of the tower body in place by using derrick cranes, and manually installing bolts for assembly;
step S32: after the assembly of the tower body is completed, installing cable cables 4 in the front, the back and the side directions of a tower 5, and adjusting the cable cables 4 in the front and the back of the tower 5 to enable the tower 5 to reach the designated sag;
step S33: installing a tower frame transverse moving track and a main cable saddle 3;
step S34: two ends of a main cable 6 of the cable structure penetrate through a main cable saddle 3 corresponding to the top of a tower 5 and then are fixed on an anchoring system 2;
step S35: then a traction cable 7 is installed, and two ends of the traction cable 7 are connected with a winch which is fixed below the tower 5 and used for drawing the traction cable 7;
step S36: the upper part of a sports car 8 is connected with a main cable 6 through a pulley, the lower part of the sports car 8 is fixedly connected with a traction cable 7, a hoisting cable 9 is arranged below the sports car 8, and a lifting appliance 10 is arranged below the hoisting cable 9;
step S37: the cable system is subjected to test hoisting, and the sports car 8 carries repeatedly in no-load mode, is subjected to static test hoisting and runs in hoisting weight mode;
step S4: the bridge surface guardrail and the sidewalk of the original bridge 1 are dismantled by a diamond wire saw cutting method, the dismantling effect is shown in figure 4, the aim is to reduce the dead weight of the bridge as much as possible and provide conditions for later construction; according to the construction drawing of the original bridge 1, the positions of the key components of the old arch 18 and the diaphragm beam 19 are accurately marked on the bridge floor, so that the stress of the whole bridge caused by the early damage of the old arch 18 in the cutting process of the diamond wire saw is prevented; cutting off the bridge deck pavement from the center of the bridge to the direction from the abutment on two sides by using a diamond wire saw cutting method, then cutting off the bridge deck of the beam I and the beam III by using a diamond wire saw, hoisting the cut bridge deck by using a lifting appliance 10, removing the diaphragm beams 19 of the beam I and the beam III, providing conditions for the hoisting and splicing of the box-shaped arch 20, wherein the removing effect is shown in figure 5;
step S5: the box-type arches 20 are respectively installed at the I-beam and the III-beam in the direction from the two ends of the abutment to the center of the bridge, the installation effect is shown in figure 6, each prefabricated box-type arch block is connected with the old arch 18 in the installation process, partial load of the box-type arches 20 is transmitted to the old arch 18, and the specific implementation process is as follows:
step S51: hoisting a prefabricated box type arch block by using a lifting appliance 10, carrying out cast-in-place pouring on a beam I and a beam III respectively from an abutment by binding joint reinforcing steel bars on the box type arch block and joint reinforcing steel bars on the abutment, maintaining the cast-in-place position and dismantling a scaffold and a template after the pouring is finished, and finishing the connection between a box type arch 20 and the abutment after cast-in-place concrete reaches the design strength;
step S52: hoisting a temporary construction platform and workers to a prefabricated box-shaped arch 20 through a lifting appliance 10, connecting the box-shaped arch 20 with an old arch 18 by using structures such as square steel 21, lock catches and the like, transmitting partial load of the box-shaped arch 20 to the old arch 18, and simultaneously preventing the box-shaped arch 20 from deviating from a design position, wherein the old arch 18 is four old arch ribs which are positioned at two sides of a No. II beam in the graph 5;
step S53: installing other box-type arch blocks at the I-beam and the III-beam respectively according to the directions from the two ends of the bridge abutment to the center of the bridge, binding joint reinforcing steel bars of the two adjacent parts of the box-type arch blocks, conveying concrete through concrete conveying stations at the two sides of the bridge abutment to cast in situ the joint reinforcing steel bars of the two adjacent parts of the bound box-type arch blocks until box-type arches 20 at the I-beam and the III-beam are folded at a midspan, and curing and removing templates at the cast-in-situ positions of all the box-type arch blocks after casting is finished;
step S54: after the cast-in-place concrete in the step S53 reaches the design strength, the square steel 21 and the lock catch which are used for connecting the prefabricated box-type arch 20 and the old arch 18 are removed, conditions are provided for removing the old arch 18, and the construction of the whole box-type arch 20 of the new beam I and the new beam III is completed, so that the construction method has the capability of bearing part of self load and upper load;
and in the steps S51-S54, maintaining the cast-in-place position according to the acceptance criteria of the construction quality of the concrete structure engineering.
In fig. 6, the box-type arches 20 installed at the I-beam and the III-beam are connected with the II-beam of the original bridge 1 through square steel 21 and latches at one side close to the II-beam, and connected with the old arch 18 of the original bridge 1 through square steel 21 and latches at one side close to the old arch 18.
Step S6: according to the construction method of the step S4, the bridge deck and the transverse beam 19 of the beam II are dismantled, all the old arches 18 of the original bridge 1 are dismantled to reduce the dead weight of the whole bridge and provide guarantee for the stability of the bridge, and the transverse connecting beam 24 is adopted to connect the beam I with the box arch 20 at the beam III; cutting the whole old arch 18 into a plurality of parts by a diamond wire saw cutting method, hoisting the parts to two sides of a bridge abutment through a hanger 10, and conveying the parts to the outside of a field through a transport vehicle;
step S7: according to the bridge design file, the arch-top vertical wall 23 is installed, and the concrete operations are as follows:
according to a bridge design file, joint reinforcing steel bars of the arch vertical wall 23 are reserved at the designated positions of part of box arch blocks of the box arch 20, the arch vertical wall 23 and the joint reinforcing steel bars reserved at the designated positions of part of the box arch blocks of the box arch 20 are bound, then the bound parts are cast in situ, and the casting sequence is cast in the direction from the abutment platforms at two sides to the center of the bridge; the pouring mode adopts a mode of building a template by virtue of joint steel bars, and concrete is cast in situ by virtue of concrete conveying stations on two sides of the abutment; after pouring is finished, the cast-in-place arch vertical wall 23 is maintained, a template is removed and other procedures are carried out according to the acceptance criteria of construction quality of concrete structure engineering, and after the No. I beam and the No. III beam reach the strength, the arch vertical wall 23 is installed;
step S8: according to the direction from the abutment to the center of the bridge, the bent cap 22 is sequentially installed on the arch-shaped upright wall 23, and the specific operation of installing the bent cap 22 is as follows:
hoisting the prefabricated bent cap 22 to the arch-up vertical wall 23 through the hoisting tool 10, erecting a template through joint reinforcing steel bars reserved on the arch-up vertical wall 23 and joint reinforcing steel bars at the bottom end of the bent cap 22 without withdrawing the hoisting tool 10, and pouring joint sections; after pouring is finished, the cast-in-place section is maintained, a template is removed and other procedures are carried out according to the acceptance criteria of construction quality of concrete structure engineering, after the cover beams 22 on the I beam and the III beam and the joint sections of the arch vertical walls 23 reach the strength, the cover beams 22 are erected;
step S9: installing a rubber support 25 on the bent cap 22, hoisting the bridge deck to the rubber support 25 of the bent cap 22 through the lifting appliance 10, and finishing the erection of all bridge decks on the bent cap 22 according to the direction from two sides of the abutment to the center of the bridge;
step S10: paving a bridge deck pavement, a sidewalk plate, a guardrail and an expansion joint, wherein the bridge forming effect is shown in figures 7-10;
step S11: demolish the arch bridge of building and simply demolish and rebuild the structure: the hoisting cable 9 is lowered to the ground, removed on the spot and transported to a stacking site, and the hoisting cable 9 is completely released, so that safety accidents are avoided; the trolley 8 is pulled to the position near the tower top for dismantling, numbering, sorting and recycling are carried out, and small parts cannot be discarded; maintenance, arrangement and assembly are carried out in a storage site, and after inspection and acceptance pass, tasks can be completed; other special equipment, machines and special materials are carried out according to the requirements by the program; the traction rope 7 and the main rope 6 are recovered under the coordination of reverse traction of the winch;
step S12: when the vehicle-mounted lifter enters a field, the vehicle-mounted lifter assists in removing the tower top transverse rail, the main cable saddle 3 and the tower body of the tower 5, the anchor system 2 is removed by using a crane in a tidying and recycling manner;
step S13: and (5) cleaning the construction site, and enabling all mechanical equipment to go back to the field, namely, enabling the vehicle to be communicated.
All the components are installed after being measured by engineering operators, and meanwhile, real-time monitoring and measurement can be carried out in the construction process, so that the installation accuracy of all the components is ensured.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The arched bridge simply demolishs and rebuilds the structure, its characterized in that includes:
the anchoring systems (2) are arranged on two sides of the river channel;
the tower (5), the tower (5) corresponds to the anchoring system (2), and is arranged on one side of the anchoring system (2) close to the river channel;
two ends of a main cable (6) of the cable structure respectively penetrate through a main cable saddle (3) corresponding to the top of the tower (5) and are fixedly connected with anchoring systems (2) on two sides of a river channel after being supported by the main cable saddle (3).
2. The arch bridge easy demolition reconstruction structure according to claim 1, wherein said anchoring system (2) comprises anchor piles (11), skid beams (12) and rear anchors (13), wherein:
the sliding beam (12) is connected with anchor piles (11) at two ends, and a slidable rear anchor (13) is arranged on the sliding beam (12).
3. The arch bridge easy-to-demolish reconstruction structure according to claim 2, wherein the anchor piles (11), the sliding beams (12) and the rear anchors (13) are all reinforced concrete structures cast in situ;
a main cable (6) of a cable structure is fixed on the rear anchor (13);
a sliding plate (14) is embedded in the sliding beam (12), and the rear anchor (13) is connected with the sliding plate (14) in a sliding mode.
4. The arch bridge simple demolition reconstruction structure according to claim 2, wherein the anchor piles (11) of the anchoring systems (2) located at both sides of the river are respectively provided with a winch;
two twisted steel bars are transversely arranged in the rear anchor (13), wherein:
two ends of each threaded steel bar are respectively and correspondingly connected with the end parts of the steel wire ropes wound on the windlass after penetrating through the anchor piles (11) on the two sides, and the windlass at the two anchor piles (11) rotates in the reverse direction and can transversely move after being pulled by the two threaded steel bars.
5. The arch bridge easy demolition reconstruction structure according to any one of claims 1 to 4, wherein the tower (5) comprises a tower foundation and a tower body on the tower foundation, wherein:
the tower foundation is a reinforced concrete structure formed by cast-in-place;
the tower body is formed by assembling universal rod pieces, and a cable wind cable (4) is arranged on the tower body.
6. The arch bridge easy dismantling and rebuilding structure of claim 5, wherein the top of the tower body of the tower (5) is provided with a traverse rail, and rollers at the bottom of the traction flat car are positioned in the traverse rail and can roll along the traverse rail to drive the traction flat car to move;
the main cable saddle (3) is fixed on the traction flat car;
and two ends of the traction flat car are connected with two winches on the ground through traction ropes, and the two winches are used for driving the traction flat car to move along the transverse moving track.
7. An arch bridge demolishing and rebuilding method, characterized in that the arch bridge simple demolishing and rebuilding structure as claimed in any one of claims 1 to 4 or 6 is adopted, and the method is carried out according to the following steps:
step S1: the integral safety of the original bridge is evaluated, the maximum stress position and the weak bearing position of the original bridge are reinforced, and joint reinforcing steel bars are arranged at the connecting position of the box-type arch (20) and the abutment;
step S2: prefabricating box type arches (20), arch-upper vertical walls (23), cover beams (22), sidewalk boards, bridge decks and guardrails, dividing the whole box type arch (20) into a plurality of box type arch blocks, reserving joint reinforcing steel bars at the joint of two adjacent box type arch blocks, and reserving joint reinforcing steel bars connected with the arch-upper vertical walls (23) on the box type arch blocks for installing the arch-upper vertical walls (23);
step S3: mounting an arch bridge, and simply dismantling and rebuilding a structure;
step S4: dismantling bridge deck guardrails, sidewalks, bridge deck pavements, bridge deck slabs of the I-type beam and the III-type beam of the original bridge (1) by a cutting method;
step S5: installing box-type arches (20) at the I-beam and the III-beam respectively in the direction from the two ends of the abutment to the center of the bridge, enabling each prefabricated box-type arch block to be connected with the old arch (18) in the installation process, and transmitting partial load of the box-type arches (20) to the old arch (18);
step S6: according to the construction method of the step S4, removing the bridge deck and the transverse beam (19) of the second-size beam, removing all the old arches (18) of the original bridge (1), and connecting the first-size beam with the box type arch (20) of the third-size beam by adopting a transverse connecting beam (24);
step S7: installing an arch-top vertical wall (23) according to the bridge design file;
step S8: sequentially mounting bent caps (22) on the arch-mounted upright wall (23) according to the direction from the abutment to the center of the bridge;
step S9: installing a rubber support (25) on the bent cap (22), hoisting the bridge deck to the rubber support (25) of the bent cap (22) through a hoisting tool (10), and finishing the erection of all bridge decks on the bent cap (22) according to the direction from two sides of the abutment to the center of the bridge;
step S10: paving bridge deck pavement, sidewalk boards, guardrails and expansion joints;
step S11: and (4) simply dismantling and rebuilding the built arch bridge.
8. The construction method for demolishing an arch bridge according to claim 7, wherein the step S3 is performed as follows:
step S31: installing anchoring systems (2) on two sides of a river channel, pouring a tower foundation of a tower (5) on a construction site, assembling a tower body, transporting and installing universal rods of the tower body in place by using derrick cranes, and manually installing bolts for assembly;
step S32: after the tower body is assembled, front, back and side cable wind cables (4) of the tower (5) are installed, and the front and back cable wind cables (4) of the tower (5) are adjusted to enable the tower (5) to reach the designated sag;
step S33: installing a tower frame transverse moving track and a main cable saddle (3);
step S34: two ends of a main cable (6) of the cable structure penetrate through a main cable saddle (3) at the top of a corresponding tower (5) and then are fixed on an anchoring system (2);
step S35: then a traction cable (7) is installed, and two ends of the traction cable (7) are fixed on a winch which is fixed below the tower (5) and used for drawing the traction cable (7);
step S36: the upper part of a sports car (8) is connected with a main cable (6) through a pulley, the lower part of the sports car (8) is fixedly connected with a traction cable (7), a hoisting cable (9) is arranged below the sports car (8), and a lifting appliance (10) is arranged below the hoisting cable (9);
step S37: the cable system is tried to be hung, and the sports car (8) is repeatedly carried in no-load mode, is hung in a static load test mode and is operated in a hanging mode.
9. The construction method for demolishing an arch bridge according to claim 7, wherein the step S5 is performed as follows:
step S51: hoisting a prefabricated box type arch block by using a hoisting tool (10), carrying out cast-in-place pouring on a beam I and a beam III respectively from an abutment by binding joint reinforcing steel bars on the box type arch block and joint reinforcing steel bars on the abutment, maintaining the cast-in-place position and dismantling a scaffold and a template after the pouring is finished, and finishing the connection between a box type arch (20) and the abutment after cast-in-place concrete reaches the design strength;
step S52: hoisting a temporary construction platform and workers to a prefabricated box-type arch (20) through a lifting appliance (10), connecting the box-type arch (20) with an old arch (18) by using structures such as square steel (21) and lock catches, and transmitting partial load of the box-type arch (20) to the old arch (18);
step S53: according to the direction from two ends of a bridge abutment to the center of the bridge, other box-type arch blocks are respectively arranged at the I-beam and the III-beam, joint reinforcing steel bars of two adjacent parts of the box-type arch blocks are bound, concrete is conveyed through concrete conveying stations at two sides of the bridge abutment to cast in situ the joint reinforcing steel bars of the two adjacent parts of the bound box-type arch blocks until box-type arches (20) at the I-beam and the III-beam are folded at a midspan, and after the casting is finished, all the box-type arch block cast-in-situ parts are maintained and a template is removed;
step S54: and (5) after the cast-in-place concrete in the step S53 reaches the design strength, removing the square steel (21) and the lock catch between the prefabricated box type arch (20) and the old arch (18).
10. The construction method for demolishing an arch bridge according to claim 7, wherein the step S7 is performed as follows:
according to a bridge design file, joint reinforcing steel bars of an arch vertical wall (23) are reserved at the appointed positions of partial box type arch blocks of a box type arch (20), the arch vertical wall (23) and the joint reinforcing steel bars reserved at the appointed positions of the partial box type arch blocks of the box type arch (20) are bound, then the bound parts are cast in situ, and the casting sequence is that casting is carried out according to the direction from abutment platforms at two sides to the center of the bridge; the pouring mode adopts a mode of building a template by virtue of joint steel bars, and concrete is cast in situ by virtue of concrete conveying stations on two sides of the abutment; after the pouring is finished, maintaining and removing the template for the cast-in-place arch vertical wall (23), and finishing the installation of the arch vertical wall (23) after the No. I beam and the No. III beam arch vertical wall (23) reach the strength;
the specific operation of step S8 is as follows:
hoisting the prefabricated bent cap (22) to the arch-up vertical wall (23) through the hoisting tool (10), erecting a template through joint reinforcing steel bars reserved on the arch-up vertical wall (23) and joint reinforcing steel bars at the bottom end of the bent cap (22) without withdrawing the hoisting tool (10), and pouring joint sections; and after the pouring is finished, maintaining the cast-in-place section, and dismantling the template, and after the cover beams (22) on the I beam and the III beam and the joint sections of the arch vertical walls (23) reach the strength, erecting the cover beams (22).
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| CN116791494A (en) * | 2023-07-27 | 2023-09-22 | 中国水利水电第三工程局有限公司 | Demolishing and newly-built construction method for riverbed power station traffic bridge |
| CN116791494B (en) * | 2023-07-27 | 2024-03-08 | 中国水利水电第三工程局有限公司 | Demolishing and newly-built construction method for riverbed power station traffic bridge |
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