CN114150593B - Simple arch bridge dismantling and reconstructing structure and arch bridge dismantling and reconstructing method - Google Patents
Simple arch bridge dismantling and reconstructing structure and arch bridge dismantling and reconstructing method Download PDFInfo
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- CN114150593B CN114150593B CN202111540252.XA CN202111540252A CN114150593B CN 114150593 B CN114150593 B CN 114150593B CN 202111540252 A CN202111540252 A CN 202111540252A CN 114150593 B CN114150593 B CN 114150593B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000010276 construction Methods 0.000 claims abstract description 53
- 238000004873 anchoring Methods 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 238000011065 in-situ storage Methods 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 30
- 238000005266 casting Methods 0.000 claims description 25
- 239000004567 concrete Substances 0.000 claims description 23
- 238000013461 design Methods 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 8
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000011900 installation process Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007665 sagging Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 9
- 229910003460 diamond Inorganic materials 0.000 description 5
- 239000010432 diamond Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009432 framing Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 241001139947 Mida Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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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
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Abstract
The invention discloses a simple arch bridge dismantling and reconstructing structure and a simple arch bridge dismantling and reconstructing method, wherein the simple arch bridge dismantling and reconstructing structure comprises the following components: the anchoring systems are arranged at two sides of the river channel; the tower frame corresponds to the anchoring system and is arranged at one side of the anchoring system close to the river channel; and the two ends of the main rope of the cable structure respectively penetrate through the main rope saddle at the top of the corresponding tower and are fixedly connected with the anchoring systems at the two sides of the river after being supported by the main rope saddle. The anchoring system comprises anchor piles, sliding beams and rear anchors, wherein the sliding beams are connected with the anchor piles at two ends, and the sliding beams are provided with the rear anchors which can slide. When the arch bridge is dismantled and rebuilt, a method for dismantling part of the original bridge, namely rebuilding part of the bridge, 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 rib is utilized to participate in stress, and the box arch is assembled through prefabrication, so that 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 relates to a simple arch bridge dismantling and reconstructing structure and a simple arch bridge dismantling and reconstructing method.
Background
In the last century, arch bridges have been widely used in China due to the characteristics of beautiful appearance, simple construction and the like. Many old arch bridges cannot meet the requirements of road traffic on high efficiency and safety, even cannot meet the normal traffic requirements, and the dismantling and reconstructing of the old arch bridges become the problem to be solved urgently. The bridge is dismantled and not only can influence the traffic of the surrounding area and surrounding buildings, but also can pollute the environment due to improper treatment, and meanwhile, various dangers and uncertain factors can be faced in the bridge dismantling process, so that the safety protection facilities are arranged to protect the personal safety of constructors, and the maximum strength and pollution reduction become important factors which must be considered in construction. The traditional bridge dismantling method can be divided into three types of a blasting dismantling method, a mechanical dismantling method and a static crushing dismantling method, wherein the blasting dismantling method has the advantages of high construction speed, short construction period, small manpower consumption and high efficiency, but has the advantages of high cost, low safety coefficient and large influence on the environment; the mechanical dismantling method has small influence on the environment, can control the construction range, is safer in dismantling process, can simultaneously carry out dismantling operation and crushing operation, has high dismantling speed and low cost, but needs to set up a bracket, and is not suitable for water areas with deep water and urgent water; the static breaker dismantling method does not generate vibration and flying stones, is safer, but has limited breaking capacity, cannot effectively dismantle structures with overlarge strength, and has long dismantling time. It is therefore practical to find a construction method that is safe to remove and can shorten the reconstruction period. And the present inventors found that the following problems also exist in the prior art:
1. the construction method adopts the construction steps of dismantling and reconstructing, so that the construction period is greatly prolonged, meanwhile, the construction method is complex, a large amount of labor and templates are required for building a full framing, and the construction cost is increased; the river needs to be cut off, the water source along the 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 nation are not met;
2. all the stress of the dismantling method is borne by the newly built structure, and a plurality of methods are needed to be utilized to firmly build the bridge, so that time and labor are wasted; the dismantling method can have great influence on the environment, and generate great noise and more dust; the mechanical crushing method or the blasting method can cause a large number of crushing structures to drop into the river channel, so that pollution is generated to the river channel;
3. the large-scale machinery required by the traditional bridge dismantling at present is not suitable for special engineering environments in the field, 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 and easy dismantling reconstruction structure of an arch bridge, which aims to solve the problems that a full framing, large machinery and a complex structure are required to be erected in the existing construction structure.
Another object of the embodiment of the invention is to provide an arch bridge dismantling and rebuilding method, 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 arched bridge simply demolishs and rebuilds structure includes:
the anchoring systems are arranged at two sides of the river channel;
the tower frame corresponds to the anchoring system and is arranged at one side of the anchoring system close to the river channel;
and the two ends of the main rope of the cable structure respectively penetrate through the main rope saddle at the top of the corresponding tower and are fixedly connected with the anchoring systems at the two sides of the river after being supported by the main rope saddle.
Further, the anchoring system comprises an anchor pile, a skid beam and a rear anchor, wherein:
the sliding beam is connected with anchor piles on two ends, and a slidable rear anchor is arranged on the sliding beam.
Furthermore, the anchor piles, the sliding beams and the rear anchors are all reinforced concrete structures formed by casting in situ;
a main rope of a cable structure is fixed on the rear anchor;
the sliding beam is pre-embedded with a sliding plate, and the rear anchor is in sliding connection with the sliding plate.
Further, windlass is respectively arranged at anchor piles of the anchor systems at two sides of the river channel;
two twisted steel bars are transversely arranged in the rear anchor, wherein:
two ends of the two twisted steel bars are fixedly connected with the end parts of the steel wire ropes wound on the windlass after penetrating through the anchor piles on two sides respectively, the windlass at the two anchor piles reversely rotates, and the anchors can transversely move after being pulled by the two twisted 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 casting in situ;
the tower body is formed by assembling universal rod pieces, and a cable rope is arranged on the tower body.
Further, a transverse moving track is arranged at the top of the tower body of the tower, and rollers at the bottom of the traction flatcar are positioned in the transverse moving track and can roll along the transverse moving track to drive the traction flatcar to move;
the main cable saddle is fixed on the traction flatcar;
the two ends of the traction flat car are connected with two windlass on the ground through traction ropes, and the windlass is 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 dismantling and reconstructing method adopts the simple arch bridge dismantling and reconstructing structure and is carried out according to the following steps:
step S1: the method comprises the steps of carrying out overall safety evaluation on an original bridge, reinforcing the position with the largest stress and the bearing weak position of the original bridge, and arranging joint reinforcing steel bars at the connection position of a box arch and a bridge abutment;
step S2: prefabricating a box arch, an arch standing wall, a capping beam, a pavement slab, a bridge deck and guardrails, dividing the whole box arch into a plurality of box arches, reserving joint reinforcing steel bars at the joints of two adjacent box arches, and reserving the joint reinforcing steel bars connected with the arch standing wall on the box arches on which the arch standing wall is arranged;
step S3: installing an arch bridge and simply removing the reconstruction structure;
step S4: removing bridge deck guardrails, sidewalks, bridge deck pavement, bridge deck panels of the I-beam and the III-beam of the original bridge by a cutting method;
step S5: the box-type arch is respectively boxed in the I beam and the III beam Liang Chuan according to the directions from the two ends of the bridge abutment to the center of the bridge, each prefabricated box-type arch block is connected with the old arch in the installation process, and partial load of the box-type arch is transferred to the old arch;
step S6: according to the construction method of the step S4, removing bridge decks and transverse beams of the No. II beams, removing all old arches of the original bridge, and connecting the box arches at the positions of the No. I beams and the No. III beams by adopting transverse connecting beams;
step S7: installing an arch vertical wall according to bridge design files;
step S8: sequentially installing cap beams on the arch vertical wall according to the direction from the bridge abutment to the bridge center;
step S9: installing rubber supports on the bent cap, hoisting bridge decks to the rubber supports of the bent cap through a lifting appliance, and completing the erection of all bridge decks on the bent cap according to the directions from two sides of the bridge decks to the center of the bridge;
step S10: paving a bridge deck pavement, a pavement plate, a guardrail and an expansion joint;
step S11: and the built arch bridge is removed, and the reconstruction structure is simply removed.
Further, the specific operation of the step S3 is as follows:
step S31: installing anchoring systems on two sides of a river channel, pouring a tower foundation of a tower in a construction site, assembling a tower body, transporting and installing universal rods of the tower body in place by adopting a derrick mast crane, and assembling by adopting manual installation bolts;
step S32: after the tower body is assembled, installing cable ropes at the front and rear sides and at the lateral sides of the tower, and adjusting the cable ropes at the front and rear sides of the tower to enable the tower to reach specified sagging;
step S33: installing a tower traversing rail and a main cable saddle;
step S34: two ends of a main cable of the cable rope structure pass through a main cable saddle at the top of a corresponding tower and then are fixed on an anchoring system;
step S35: installing a traction rope, wherein two ends of the traction rope are fixed on a winch below the tower for traction of the traction rope;
step S36: the upper part of the sports car is connected with the main rope through a pulley, the lower part of the sports car is fixedly connected with the traction rope, meanwhile, a lifting rope is arranged below the sports car, and a lifting appliance is arranged below the lifting rope;
step S37: the cable system carries out test hoisting, and the roadster is carried repeatedly under no load, and the test hoisting is carried under static load, and the hoisting is carried out.
Further, the specific operation of step S5 is as follows:
step S51: hoisting prefabricated box-shaped arch blocks by using a lifting appliance, respectively carrying out cast-in-situ casting on the I-beam and the III-beam through binding joint reinforcing steel bars on the box-shaped arch blocks and joint reinforcing steel bars on the bridge abutment from the bridge abutment, curing the cast-in-situ position and dismantling a scaffold and a template after casting is completed, and completing the connection between the box-shaped arch and the bridge abutment after the cast-in-situ concrete reaches the design strength;
step S52: hoisting the temporary construction platform and workers to the prefabricated box arch through a lifting appliance, connecting the box arch with the old arch through square steel, a lock catch and other structures, and transmitting part of load of the box arch to the old arch;
step S53: installing other box-shaped arches at the positions of 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 two adjacent parts of the box-shaped arches, carrying out cast-in-situ casting on the joint reinforcing steel bars of two adjacent parts of the bound box-shaped arches by concrete conveyed by concrete conveying stations at the two sides of the bridge abutment until the box-shaped arches at the positions of the I beam and the III beam are folded at a midspan, and curing and removing templates at cast-in-situ positions of all the box-shaped arches after casting is completed;
step S54: and (3) after the cast-in-place concrete in the step S53 reaches the design strength, removing square steel and lock catches between the prefabricated box arch and the old arch.
Further, the specific operation of step S7 is as follows:
reserving joint reinforcing steel bars of the arch upright wall at the designated positions of part of the box arch blocks of the box arch according to bridge design files, binding the arch upright wall with the joint reinforcing steel bars reserved at the designated positions of the part of the box arch blocks of the box arch, casting the binding parts on site, and casting according to the casting sequence from bridge abutment at two sides to the center of the bridge; the pouring mode adopts a mode of building templates by means of joint steel bars, and concrete is poured in situ through concrete conveying stations at two sides of the bridge abutment; after pouring is completed, curing and removing the template from the cast-in-situ vertical arch wall, and completing the installation of the vertical arch wall after the I-beam and III-beam vertical arch walls reach the strength;
the specific operation of the step S8 is as follows:
hoisting the prefabricated bent cap to the arch vertical wall through a hoisting tool, wherein the hoisting tool does not withdraw, 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 cast-in-situ section is cured and the template is removed after pouring, and after the joint sections of the capping beams on the I-beam and the III-beam and the arch vertical wall reach the strength, the capping beam is erected.
The embodiment of the invention has the beneficial effects that:
1. compared with the method for reconstructing the bridge after removing 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 fact that the existing construction method adopts construction steps of removing and reconstructing firstly is effectively solved.
2. In the dismantling and rebuilding process, 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 rib is utilized to participate in stress, the buckling rope is not required to be utilized again to stabilize the newly built bridge, and time and labor are saved; the newly built bridge and the original bridge are stressed cooperatively in the construction process, a bracket is not required to be built in all the construction processes, the original bridge is not dismantled and rebuilt by using the blasting technology, excessive crushing structures are not generated, the noise is low, the dust is less, the surrounding residents and buildings are not greatly influenced, and the river basin is protected to the maximum extent; and the construction flow is simplified, and the construction cost is reduced. The method effectively solves the problems of high cost and easy environmental pollution of the existing construction method.
3. The simple and easy construction structures who demolishs of arch bridge that provides is for adopting cable hoisting's construction structures, does not need to use large-scale construction equipment, also does not need to set up full framing, simple structure, can demolish fast, and reuse rate is high, and is with low costs, can be used to the inconvenient, the little special environment of construction space of traffic, has solved current construction structures and has need set up full framing and large-scale machinery, the complicated problem of structure.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic side view of an arch bridge with a simple demolition reconstruction structure according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of an anchoring system according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of an anchoring system according to 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 the arch bridge structure with deck boards and diaphragm plates removed from the beams i and iii.
Fig. 6 is a schematic top view of the closure of the box arch.
Fig. 7 is a schematic top view of a bridge.
Fig. 8 is a schematic side view of a bridge.
Fig. 9 is a cross-sectional view of the bridged main beam I-I.
Fig. 10 is a cross-sectional view of the bridged main beam II-II.
In the figure, 1, a primary bridge, 2, an anchoring system, 3, a main rope saddle, 4, a cable rope, 5, a tower, 6, a main rope, 7, a traction rope, 8, a sports car, 9, a lifting rope, 10, a lifting appliance, 11, an anchor pile, 12, a sliding beam, 13, a rear anchor, 14, a sliding plate, 15, a main rope anchoring point, 16, a sliding block, 17, a steel bar pore canal, 18, an old arch, 19, a diaphragm beam, 20, a box arch, 21, square steel, 22, a capping beam, 23, an arch upper standing wall, 24, a transverse connecting beam and 25.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
An embodiment of the present invention provides an arch bridge demolishing reconstruction structure, as shown in fig. 1, including:
the anchoring systems 2 are arranged on two sides of the river channel;
the tower 5 corresponds to the anchoring system 2 and is arranged at one side of the anchoring system 2 close to the river channel;
and two ends of a main cable 6 of the cable structure respectively penetrate through the main cable saddle 3 corresponding to the top of the tower 5 and are fixedly connected with the anchoring systems 2 at two sides of the river after being supported by the main cable saddle 3.
Further, the anchoring system 2 comprises an anchor pile 11, a skid beam 12 and a rear anchor 13, as shown in fig. 2, wherein:
the slide beam 12 is connected with anchor piles 11 on two ends, and a slidable rear anchor 13 is arranged on the slide beam 12.
Further, a sliding plate 14 is pre-buried on the sliding beam 12, and the rear anchor 13 is slidably connected with the sliding plate 14.
Further, the anchor pile 11, the sliding beam 12 and the rear anchor 13 are all in-situ cast reinforced concrete structures, the main rope 6 of a cable structure is fixed on the rear anchor 13, and the main rope 6 is fixed at a main rope anchoring point 15 on the rear anchor 13, as shown in fig. 3.
Further, the anchor piles 11 of the anchor systems 2 positioned at two sides of the river channel are respectively provided with a winch, two twisted steel bars are transversely arranged in the rear anchor 13, the two twisted steel bars are positioned in the steel bar pore canal 17 shown in fig. 3, two ends of the two twisted steel bars are respectively and correspondingly penetrated through the anchor piles 11 at two sides and then are fixedly connected with the end parts of the steel wire ropes wound on the winches, when the rear anchor 13 needs to transversely move, the winches at the two anchor piles 11 reversely rotate (namely, one forwardly rotates and one reversely rotates, so that one winch tightens the steel wire ropes, and the other winch loosens the steel wire ropes), so that the rear anchor 13 transversely moves after being pulled by the two twisted steel bars.
The tower 5 comprises a tower foundation and a tower body on the tower foundation, wherein the tower foundation is of a reinforced concrete structure formed by casting in situ, and the tower body is formed by assembling universal rods.
Further, the tower body top of the tower 5 is provided with a transverse moving track, the idler wheels at the bottom of the traction flat car are positioned in the transverse moving track and can roll along the transverse moving track 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 windlass on the ground through traction ropes and used for driving the traction flat car to move along the transverse moving track, the two windlass reversely rotate to realize the transverse movement of the main cable saddle 3, when the main cable saddle 3 is required to be fixed, the baffle plates arranged on two sides of the main cable saddle 3 are fixedly connected with the tower 5 so as to enable the traction flat car to be driven, and the purpose of arranging the movement of the main cable saddle 3 is to adapt to the lifting of arch ribs on different axes, so that the construction cost is reduced, and the construction difficulty is reduced.
Further, a cable rope 4 is arranged on the tower body of the tower 5, the cable rope 4 is used for adjusting and fixing the position of the tower 5, the ground part of the cable rope 4 is connected with a fixed ground anchor of the cable rope, and the upper part of the cable rope 4 is connected with a universal rod piece of the tower body of the tower 5 by a lock catch.
Further, the cable system comprises a main cable 6, a traction cable 7, a sports 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 parallel to the main cable 6, the traction cable 7 is used for traction of the sports car 8 to move, the upper part of the sports car 8 is connected with the main cable through a pulley, and the lower part of the sports car 8 is fixedly connected with the traction cable 7; the lifting rope 9 is arranged at the bottom of the running car 8 and used for moving the lifting appliance 10 up and down; and the lifting appliance 10 is arranged on the lifting rope 9 and is used for mounting a lifting object.
Example 2
The arch bridge dismantling and reconstructing method of the embodiment of the invention adopts the simple arch bridge dismantling and reconstructing structure of the embodiment 1 and is carried out according to the following steps:
step S1: the whole safety evaluation is carried out on the original bridge at the construction site, so that the required structural data is obtained, and the later bridge design is facilitated; modeling and calculating the original bridge by using finite element software such as Midas and ANSYS to obtain the maximum stress and weak bearing position of the original bridge, and reinforcing the maximum stress and weak bearing position (such as the bridge abutment near the inner side of the river) of the original bridge to prevent the influence of construction disturbance on the whole bridge in the construction process; drilling holes on the connection parts of the box arch 20 and the bridge abutment by using a drilling machine, filling a mixture of epoxy resin and a reinforcing steel bar binder into the holes, and then inserting joint reinforcing steel bars to provide conditions for the connection of the box arch 20 and the bridge abutment; simultaneously, the connection part of the old arch 18 and the bridge abutment is cast-in-situ and reinforced;
step S2: prefabricated box arches 20, arch-up vertical walls 23, capping beams 22, pavement plates, bridge decks and guardrails; dividing the whole box arch 20 into a plurality of box arches, reserving joint reinforcing steel bars at the joints of two adjacent box arches, and reserving joint reinforcing steel bars connected with the overhead arch wall 23 on the box arches provided with the overhead arch wall 23; the arch standing wall 23 is prefabricated according to the height between the abutment and the position on the box arch 20 where the arch standing wall 23 is arranged; prefabricating the pavement plates, guardrails and the bent cap 22 according to the design size; the bridge deck is pre-sized with the cap beams 22 spaced apart; all the design dimensions and prefabrication processes are carried out according to the general rule for designing highway bridge and culvert;
step S3: the simple and easy reconstruction structure that demolishs of installation arch bridge specifically follows:
step S31: the anchor systems 2 are arranged on two sides of a river channel, a tower foundation of a tower 5 is cast in a construction site, a tower body is assembled, and after the universal rod piece of the tower body is transported and installed in place by a derrick mast crane, the tower body is assembled by manual installation bolts;
step S32: after the tower body is assembled, installing the front and rear and lateral cable ropes 4 of the tower 5, and adjusting the front and rear cable ropes 4 of the tower 5 to enable the tower 5 to reach specified sagging;
step S33: installing a tower traversing rail and a main cable saddle 3;
step S34: two ends of a main cable 6 of a cable structure pass 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: a traction rope 7 is installed, and two ends of the traction rope 7 are fixed on a winch below the tower 5 for traction of the traction rope 7;
step S36: the upper part of a sports car 8 is connected with a main rope 6 through a pulley, the lower part of the sports car 8 is fixedly connected with a traction rope 7, a lifting rope 9 is arranged below the sports car 8, and a lifting appliance 10 is arranged below the lifting rope 9;
step S37: the cable system carries out test hoisting, and the roadster 8 carries repeatedly in idle load and carries out test hoisting under static load and hoisting weight operation;
step S4: removing bridge deck guardrails and sidewalks of the original bridge 1 by a diamond rope saw cutting method, wherein the removing effect is shown in fig. 4, and the purpose 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 key components of the old arch 18 and the diaphragm 19 are accurately marked on the bridge deck, so that the old arch 18 is prevented from being damaged too early in the cutting process of the diamond rope saw to damage the stress of the whole bridge; cutting bridge deck pavement from the direction from the center of the bridge to bridge decks on two sides by using a diamond rope saw cutting method, then cutting bridge decks of the I beam and the III beam by using a diamond rope saw, lifting away the cut bridge decks by using a lifting appliance 10, and removing a diaphragm beam 19 of the I beam and the III beam to provide conditions for lifting and splicing the box arch 20, wherein the removal effect is shown in figure 5;
step S5: the box arches 20 are respectively arranged at the I beam and the III beam according to the directions from the two ends of the bridge abutment to the center of the bridge, the installation effect is shown in fig. 6, each prefabricated box arch block is connected with the old arch 18 in the installation process, and partial load of the box arches 20 is transferred to the old arch 18, and the concrete implementation process is as follows:
step S51: hoisting prefabricated box-shaped arch blocks by using a lifting appliance 10, respectively carrying out cast-in-situ casting on the I-beam and the III-beam at the positions of the I-beam and the III-beam through binding joint steel bars on the box-shaped arch blocks and joint steel bars on the bridge abutment, curing the cast-in-situ positions and dismantling scaffolds and templates after casting is completed, and completing the connection between the box-shaped arch 20 and the bridge abutment after the cast-in-situ concrete reaches the design strength;
step S52: hoisting a temporary construction platform and workers to a prefabricated box-type arch 20 through a hoisting tool 10, connecting the box-type arch 20 with an old arch 18 through square steel 21, a lock catch and other structures, transmitting partial load of the box-type arch 20 to the old arch 18, and simultaneously preventing the box-type arch 20 from deviating from a design position, wherein the old arch 18 is four old arch ribs positioned on two sides of a II-shaped beam in fig. 5;
step S53: installing other box-shaped arch blocks at the positions of 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 two adjacent parts of the box-shaped arch blocks, carrying out cast-in-situ casting on the joint reinforcing steel bars of two adjacent parts of the bound box-shaped arch blocks by concrete conveyed by concrete conveying stations at the two sides of the bridge abutment until the box-shaped arch 20 at the positions of the I beam and the III beam is folded at a midspan, and curing and removing templates at cast-in-situ positions of all the box-shaped arch blocks after casting is completed;
step S54: after the cast-in-place concrete in the step S53 reaches the design strength, removing square steel 21 and lock catches between the prefabricated box-shaped arch 20 and the old arch 18 to provide conditions for removing the old arch 18, and completing the construction of the whole box-shaped arch 20 of the new I-beam and the new III-beam, thereby having the capacity of bearing a part of self load and upper load;
and in the steps S51-S54, curing the cast-in-situ position according to the 'concrete structure engineering construction quality acceptance Specification'.
In fig. 6, a box arch 20 is installed at the positions of the I beam and the III beam, one side close to the II beam is connected with the II beam of the original bridge 1 through a square steel 21 and a lock catch, and one side close to the old arch 18 is connected with the old arch 18 of the original bridge 1 through the square steel 21 and the lock catch.
Step S6: according to the construction method of the step S4, removing bridge decks and transverse beams 19 of the No. II beams, removing all old arches 18 of the original bridge 1 to lighten the dead weight of the whole bridge, providing guarantee for the stability of the bridge, and adopting transverse connecting beams 24 to connect box arches 20 at the positions of the No. I beams and the No. III beams; the whole old arch 18 is cut into a plurality of parts by a diamond rope saw cutting method, is hoisted to two sides of the bridge abutment by the lifting appliance 10, and is transported to the outside of the field by the transport vehicle;
step S7: according to bridge design files, the arch upright wall 23 is installed, and the concrete operation is as follows:
reserving joint reinforcing steel bars of the arch upright wall 23 at the designated positions of part of the box-shaped arch blocks of the box-shaped arch 20 according to bridge design files, binding the arch upright wall 23 with the joint reinforcing steel bars reserved at the designated positions of part of the box-shaped arch blocks of the box-shaped arch 20, casting the binding parts in situ, and casting the bridge abutment at two sides towards the center of the bridge according to the casting sequence; the pouring mode adopts a mode of building templates by means of joint steel bars, and concrete is poured in situ through concrete conveying stations at two sides of the bridge abutment; after pouring, curing the cast-in-situ arch standing wall 23 according to the construction quality acceptance criterion of the concrete structure engineering, removing the templates and the like, and finishing the installation of the arch standing wall 23 after the I-beam and III-beam arch standing wall 23 reach the strength;
step S8: the capping beams 22 are installed on the arch vertical walls 23 in sequence in the direction from the bridge abutment to the bridge center, and the capping beams 22 are installed as follows:
hoisting the prefabricated capping beam 22 to the arch vertical wall 23 through the hoisting tool 10, wherein the hoisting tool 10 does not withdraw, erecting a template through joint reinforcing steel bars reserved on the arch vertical wall 23 and joint reinforcing steel bars at the bottom end of the capping beam 22, and pouring joint sections; after pouring, curing the cast-in-situ section according to the construction quality acceptance criterion of the concrete structure engineering, removing the templates and the like, and after the joint sections of the capping beams 22 on the I-beam and the III-beam and the arch vertical wall 23 reach the strength, erecting the capping beams 22;
step S9: installing rubber supports 25 on the bent cap 22, hoisting bridge decks onto the rubber supports 25 of the bent cap 22 through the lifting appliance 10, and completing the erection of all bridge decks on the bent cap 22 according to the directions from two sides of the bridge decks to the center of the bridge;
step S10: paving a bridge deck pavement, a pavement plate, a guardrail and an expansion joint, wherein the bridge forming effect is shown in figures 7-10;
step S11: demolish the arch bridge that builds and simply demolish the reconstruction structure: the lifting rope 9 is lowered to the ground, released on site and transported to a stacking place, and the lifting rope 9 is completely loosened, so that safety accidents are avoided; the sports car 8 is pulled to the vicinity of the top of the tower for dismantling, numbering, sorting and recycling, and small parts cannot be discarded; maintenance, normalization and assembly are carried out in the storage site, and after the inspection and acceptance pass, the task can be completed; other special equipment, machines, special materials and the like are all carried out according to the requirement by the program; the traction rope 7 and the main rope 6 are recovered under the reverse traction coordination of the winch;
step S12: the vehicle-mounted lifter enters the ground, the vehicle-mounted lifter is used for assisting in removing the tower bodies of the tower top transverse rail, the main cable saddle 3 and the tower 5, the tower bodies are tidied and recycled, and the crane is used for assisting in removing the anchoring system 2;
step S13: and cleaning the construction site, and returning all mechanical equipment to the field to go through the vehicle.
All the components are installed and constructed after the measurement of engineering operators, and meanwhile, the real-time monitoring and measurement can be carried out in the construction process, so that the accuracy of the installation of each component is ensured.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (9)
1. The arch bridge dismantling and reconstructing method is characterized in that an arch bridge simple dismantling and reconstructing structure is adopted, and the method is carried out according to the following steps:
step S1: the method comprises the steps of carrying out overall safety evaluation on an original bridge, reinforcing the position with the largest stress and the weak bearing position of the original bridge, and arranging joint reinforcing steel bars at the connection position of a box arch (20) and a bridge abutment;
step S2: prefabricating a box arch (20), an arch upper standing wall (23), a capping beam (22), a sidewalk plate, a bridge deck and guardrails, dividing the whole box arch (20) into a plurality of box arches, reserving joint reinforcing steel bars at the joints of two adjacent box arches, and reserving the joint reinforcing steel bars connected with the arch upper standing wall (23) on the box arches provided with the arch upper standing wall (23);
step S3: install simple and easy reconstruction structure of demolising of arched bridge, the simple and easy reconstruction structure of demolising of arched bridge includes:
the anchoring systems (2) are arranged at two sides of the river channel;
the tower (5) corresponds to the anchoring system (2) and is arranged at one side of the anchoring system (2) close to the river channel;
the two ends of a main cable (6) of the cable structure respectively penetrate through a main cable saddle (3) at the top of a corresponding tower (5) and are fixedly connected with the anchoring systems (2) at two sides of a river channel after being supported by the main cable saddle (3);
step S4: removing bridge deck guardrails, sidewalks, bridge deck pavement, bridge deck panels of the I-beam and the III-beam of the original bridge (1) by a cutting method;
step S5: the box-type arch (20) is respectively boxed in the I beam and the III Liang Chuan according to the directions from the two ends of the bridge abutment to the center of the bridge, each prefabricated box-type arch block is connected with the old arch (18) in the installation process, and partial load of the box-type arch (20) is transferred to the old arch (18);
step S6: according to the construction method of the step S4, removing bridge decks and transverse beams (19) of the No. II beams, removing all old arches (18) of the original bridge (1), and connecting box arches (20) at the positions of the No. I beams and the No. III beams by adopting transverse connecting beams (24);
step S7: installing an arch vertical wall (23) according to bridge design files;
step S8: sequentially installing cap beams (22) on the arch vertical walls (23) according to the direction from the bridge abutment to the bridge center;
step S9: a rubber support (25) is arranged on the bent cap (22), the bridge deck is hoisted to the rubber support (25) of the bent cap (22) through a lifting appliance (10), and the erection of all bridge deck plates on the bent cap (22) is completed according to the directions from two sides of the bridge deck to the center of the bridge;
step S10: paving a bridge deck pavement, a pavement plate, a guardrail and an expansion joint;
step S11: and the built arch bridge is removed, and the reconstruction structure is simply removed.
2. An arch bridge demolition and reconstruction method according to claim 1, wherein the anchoring system (2) comprises an anchor pile (11), a skid beam (12) and a rear anchor (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. An arch bridge demolishing reconstruction method according to claim 2, characterized in that the anchor piles (11), the slide beams (12) and the rear anchors (13) are all reinforced concrete structures formed by casting in situ;
a main rope (6) of a cable structure is fixed on the rear anchor (13);
the sliding beam (12) is pre-embedded with a sliding plate (14), and the rear anchor (13) is in sliding connection with the sliding plate (14).
4. An arch bridge demolishing reconstruction method according to claim 2, characterized in that the anchor piles (11) of the anchor systems (2) located at both sides of the river channel are respectively provided with windlass;
two twisted steel bars are transversely arranged in the rear anchor (13), wherein:
two ends of the two twisted steel bars are fixedly connected with the end parts of the steel wire ropes wound on the windlass after penetrating through the anchor piles (11) on two sides respectively, the windlass at the two anchor piles (11) rotates reversely, and the anchors (13) can move transversely after being pulled by the two twisted steel bars.
5. An arch bridge demolition reconstruction method according to any one of claims 1-4, 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 casting in situ;
the tower body is formed by assembling universal rods, and a cable rope (4) is arranged on the tower body.
6. The arch bridge demolition and reconstruction method according to claim 5, wherein a traversing rail is arranged at the top of the tower body of the tower (5), and the rollers at the bottom of the towing flatcar are positioned in the traversing rail and can roll along the traversing rail to drive the towing flatcar to move;
the main cable saddle (3) is fixed on the traction flatcar;
the two ends of the traction flat car are connected with two windlass on the ground through traction ropes, and the windlass is used for driving the traction flat car to move along the transverse moving track.
7. An arch bridge dismantling and rebuilding method according to any one of claims 1-4 or 6, wherein the specific operation of step S3 is as follows:
step S31: the anchor systems (2) are arranged on two sides of a river course, a tower foundation of a tower (5) is cast in a construction site, a tower body is assembled, and after the universal rod piece of the tower body is transported and installed in place by a derrick mast crane, a manual installation bolt is assembled;
step S32: after the tower body is assembled, installing cable ropes (4) at the front and back sides and at the side of the tower (5), and adjusting the cable ropes (4) at the front and back sides of the tower (5) to enable the tower (5) to reach specified sagging;
step S33: installing a tower traversing rail and a main cable saddle (3);
step S34: two ends of a main cable (6) of a cable structure pass through a main cable saddle (3) at the top of a corresponding tower (5) and are then fixed on an anchoring system (2);
step S35: a traction rope (7) is installed, and two ends of the traction rope (7) are fixed on a winch below the tower (5) for traction of the traction rope (7);
step S36: the upper part of a sports car (8) is connected with a main rope (6) through a pulley, the lower part of the sports car (8) is fixedly connected with a traction rope (7), a hoisting rope (9) is arranged below the sports car (8), and a lifting appliance (10) is arranged below the hoisting rope (9);
step S37: the cable system carries out test hoisting, and the sports car (8) carries repeatedly in no-load and static load test hoisting and hoisting weight operation.
8. An arch bridge dismantling and rebuilding method according to any one of claims 1-4 or 6, wherein the specific operation of step S5 is as follows:
step S51: hoisting prefabricated box-shaped arch blocks by using a lifting appliance (10), respectively carrying out cast-in-situ casting on the I-beam and the III-beam by binding joint steel bars on the box-shaped arch blocks and joint steel bars on the bridge abutment from the bridge abutment, curing the cast-in-situ position and dismantling a scaffold and a template after casting is completed, and completing the connection between the box-shaped arch (20) and the bridge abutment after the cast-in-situ concrete reaches the design strength;
step S52: hoisting the temporary construction platform and workers to the prefabricated box-shaped arch (20) through a hoisting tool (10), and using square steel (21), a lock catch and other structures to connect the box-shaped arch (20) with the old arch (18) so as to transfer part of load of the box-shaped arch (20) to the old arch (18);
step S53: installing other box-shaped arch blocks at the positions of 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 two adjacent parts of the box-shaped arch blocks, carrying out cast-in-situ casting on the joint reinforcing steel bars of two adjacent parts of the bound box-shaped arch blocks by concrete conveyed by concrete conveying stations at the two sides of the bridge abutment until the box-shaped arch (20) at the positions of the I beam and the III beam are folded at the midspan, and curing and removing templates at cast-in-situ positions of all the box-shaped arch blocks after casting is completed;
step S54: and after the cast-in-place concrete in the step S53 reaches the design strength, dismantling the square steel (21) and the lock catch between the prefabricated box arch (20) and the old arch (18).
9. An arch bridge dismantling and rebuilding method according to any one of claims 1-4 or 6, wherein the specific operation of step S7 is as follows:
reserving joint reinforcing steel bars of the arch upright wall (23) at the designated positions of part of the box arch blocks of the box arch (20) according to bridge design files, binding the arch upright wall (23) with the joint reinforcing steel bars reserved at the designated positions of part of the box arch blocks of the box arch (20), and then casting the binding parts on site, wherein the casting sequence is that bridge platforms at two sides are cast towards the center of a bridge; the pouring mode adopts a mode of building templates by means of joint steel bars, and concrete is poured in situ through concrete conveying stations at two sides of the bridge abutment; after pouring is completed, curing and removing the cast-in-situ arch standing wall (23), and after the I beam and the III beam reach the strength, finishing the installation of the arch standing wall (23);
the specific operation of the step S8 is as follows:
hoisting the prefabricated capping beam (22) to the overhead vertical wall (23) through a hoisting tool (10), wherein the hoisting tool (10) does not withdraw, and building a template through joint reinforcing steel bars reserved on the overhead vertical wall (23) and joint reinforcing steel bars at the bottom end of the capping beam (22), and pouring a joint section; and after the cast-in-situ section is cured and the template is removed after pouring is finished, and after the joint sections of the capping beams (22) on the I-beam and the III-beam and the arch vertical wall (23) reach the strength, the capping beams (22) are erected.
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| CN114408763B (en) * | 2022-03-29 | 2022-08-02 | 河南省豫威起重机有限公司 | Cable crane for hydraulic engineering construction |
| 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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