CN108547223B - Steel-concrete superimposed hybrid beam bridge construction method - Google Patents
Steel-concrete superimposed hybrid beam bridge construction method Download PDFInfo
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- CN108547223B CN108547223B CN201810200693.7A CN201810200693A CN108547223B CN 108547223 B CN108547223 B CN 108547223B CN 201810200693 A CN201810200693 A CN 201810200693A CN 108547223 B CN108547223 B CN 108547223B
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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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- 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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention discloses a construction method of a steel-concrete superposed hybrid beam bridge, which comprises the following steps: s1, constructing concrete beam sections on adjacent piers simultaneously to form a front cantilever section of the beam section and a rear cantilever section of the beam section which are opposite; the initial zero block is cast in place by adopting a bracket, and the other blocks of the concrete beam section are cast in suspension by adopting a hanging basket; s2, respectively hoisting and connecting the front cantilever section of the beam section and the rear cantilever section of the beam section with steel beams of the steel-concrete combined section; s3, hoisting a plurality of small section steel beams section by section to the surface of the constructed concrete beam section, and splicing the small section steel beams into a large section steel beam; s4, mounting a front guide beam and a rear guide beam at two ends of the large-section steel beam to form a combined steel beam; s5, hoisting the large-section steel beam of the combined steel beam; s6, paving the bridge deck. The method has the advantages of being suitable for construction conditions with poor water transportation environment and large wind waves, safe in construction, high in construction efficiency and the like, and can be widely applied to the technical field of bridge construction methods.
Description
Technical Field
The invention relates to the technical field of bridge construction methods. More particularly, the present invention relates to a construction method of a hybrid girder bridge constructed by stacking steel and concrete.
Background
The steel-concrete superposed-mixed beam bridge is characterized by that it adopts mixed beam and superposed beam system at the same time. The length from the zero block to the middle of the span is a concrete beam, the length from the middle of the span is a superposed beam, and a steel-concrete combined section is arranged between the concrete beam and the superposed beam.
The common construction methods mainly include a cantilever casting method, a movable formwork method, a segment prefabrication and assembly method, a pushing method, a turning method and the like. The movable formwork method is suitable for the construction of the whole span concrete beam; the cantilever casting method is suitable for the construction of concrete beams, and is not suitable for combined beams; the segmental prefabrication and splicing method is mainly used for prefabricating and mounting concrete beams or steel beams and is matched with a bridge girder erection machine or a bridge deck crane for construction, but is not yet applied to a mixed superposed beam bridge system. The jacking method is mainly used for steel beams, and is less suitable for concrete bridges with equal sections.
The invention provides a suspension casting and pushing combined construction method suitable for a large steel-concrete superposed-mixed beam bridge, which well solves the problem of constructing the bridge without or with poor water transport conditions at bridge positions, is also favorable for the integrated organization of construction, and is worthy of popularization and application.
Disclosure of Invention
The invention aims to provide a steel-concrete composite hybrid beam bridge construction method which is suitable for construction conditions with poor water transportation environment and large wind waves, and has safe construction and high construction efficiency.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method of constructing a steel-concrete composite hybrid girder bridge, comprising the steps of: s1, constructing concrete beam sections on adjacent piers simultaneously to form a front cantilever section of the beam section and a rear cantilever section of the beam section which are opposite; the initial zero block is cast in place by adopting a bracket, and the other blocks of the concrete beam section are cast in suspension by adopting a hanging basket; s2, respectively hoisting and connecting the front cantilever section of the beam section and the rear cantilever section of the beam section with steel beams of the steel-concrete combined section; s3, hoisting a plurality of small section steel beams section by section to the surface of the constructed concrete beam section, and splicing the small section steel beams into a large section steel beam; s4, mounting a front guide beam and a rear guide beam at two ends of the large-section steel beam to form a combined steel beam, and pushing the combined steel beam to be right above the closure section area through a pushing device; s5, hoisting the large-section steel beam of the combined steel beam, cutting off a front guide beam and a rear guide beam connected with two ends of the large-section steel beam, vertically lowering the large-section steel beam to an closure section area, connecting two ends of the large-section steel beam with the steel beam of the steel-concrete combined section, and closing to form an integral structure; s6, paving the bridge deck.
Preferably, the large-section steel beam is a variable cross-section steel box girder, and the pushing device comprises: a pair of rails including a first rail and a second rail; a pair of the first rails provided at intervals in a longitudinal bridge direction at a front cantilever section of the constructed beam section on one side; the pair of second rails are arranged at intervals in the longitudinal bridge direction at the rear cantilever section of the constructed beam section at the next pier position; the first bridge deck crane is slidably erected on the first track and is fixedly connected with the rear guide beam; a plurality of pairs of upper shoes fixed to the bottom plate of the combined steel beam at intervals in the longitudinal bridge direction; each pair of upper sliding shoes is oppositely arranged along the transverse bridge direction; the lower ends of the upper sliding shoes are provided with through pin shaft holes, and the pin shaft holes of the upper sliding shoes are positioned on the same horizontal plane; the two pairs of lower sliding shoes correspond to the pair of rails, and are arranged on the rails at intervals along the longitudinal bridge direction in a sliding manner; the two pairs of oil cylinders are arranged on the track at intervals along the longitudinal bridge direction in a detachable mode; each oil cylinder corresponds to a lower sliding shoe, and a piston rod of each oil cylinder is detachably fixed on the lower sliding shoe; and the second bridge deck crane is erected and anchored on the rear cantilever section of the beam section constructed at the next pier position.
Preferably, the concrete steps of using the thrusting device to thrust the combined steel beam are as follows: a1: installing a pushing device; a2: pushing the two pairs of oil cylinders simultaneously to push the combined steel beam forwards until the combined steel beam is right above the closure section area; a3: the connection between the first bridge deck crane and the rear guide beam is removed, and the first bridge deck crane is anchored to the front cantilever section of the beam section; a4: anchoring a second bridge deck crane on the rear cantilever section of the beam section constructed at the next pier position; a5: lifting the combined steel beam by using a lifting system, and dismantling the front guide beam and the rear guide beam; a6: the first bridge deck crane and the second bridge deck crane are matched to hoist and place the variable cross-section box girder to the closure section; a7: connecting two ends of the variable cross-section box girder with steel girders of the steel-concrete combined section of the front cantilever section and the rear cantilever section of the girder section respectively to form a complete girder area structure; a8: and (5) dismantling the pushing device to finish construction.
Preferably, the small-section steel beam is transported to a construction area by a ship, and the small-section steel beam is fixed on the ship by a fixing device, the fixing device including: four steel buttresses which are fixed on the ship and form four square corners; the four skid groups correspond to the steel buttresses one by one and are arranged on the upper surfaces of the corresponding steel buttresses; the four skid components are two pairs in parallel; each skid group comprises three skids which are overlapped up and down and fixed through bolts; each steel wire rope group comprises a first steel wire rope, a second steel wire rope and a third steel wire rope which are discontinuously arranged on the same vertical plane; each steel wire rope group corresponds to a pair of skid groups; one end of the first steel wire rope is fixed on the ship, the other end of the first steel wire rope is fixed with one of the skid groups and keeps loose, the second steel wire rope is tensioned between the pair of the skid groups, and the third steel wire rope is tensioned between the other skid group and the winch; the four turn-buckle bolts are respectively arranged at four corners of the small section steel beam, one end of each turn-buckle bolt is fixed with one corner of the small section steel beam, and the other end of each turn-buckle bolt is fixed on the ship through a bolt.
Preferably, the small-section steel beam is transported to a construction area by a ship, and the method comprises the following specific steps: b1, mounting a fixing device; b2, uniformly installing beam falling buffers on the surface of the constructed concrete beam section; b3, transporting small section steel beams; b4, hoisting small section steel beams; firstly, connecting a lifting appliance system of a crane ship with lifting lugs of small-section steel beams, and removing a fixing device before lifting; slowly lifting the hook until the crane has load, and releasing the bolt; observing a gap between the small section steel beam and the skid group, and starting the winch and pulling the skid group to separate the skid group from the corresponding steel buttress when the small section steel beam and the skid group have a tendency of being separated; b5, lowering the small section steel beam; the lowering position of the beam end of the small-section steel beam is controlled, and shaking and vibration in the lowering process are eliminated through the assistance of the beam falling buffer before the hook falls.
The invention at least comprises the following beneficial effects:
the invention is suitable for the construction conditions that the wave height is large and the crane ship is difficult to operate on site, overcomes the construction conditions that the water transportation environment is poor and the wind wave is large by combining the cast-in-place method, the pushing method and the hoisting method, and forms the steel-concrete superposed mixed beam bridge with light structure dead weight and increased spanning capability. Compared with the existing pushing method, the method has the advantages that the concrete beam section is cast in situ, the pushing span is reduced, the pushing weight is reduced, the pushing work efficiency is improved, and the investment and construction risk of a large-scale floating crane are avoided. Compared with the existing hoisting method, the hoisting efficiency of the large-section steel beam is high, but the hoisting risk is high under the construction conditions of poor water transportation environment and large wind and waves.
According to the invention, the upper sliding shoes are arranged at the lower ends of the variable cross-section box girders, and the pin shaft holes of the plurality of upper sliding shoes are arranged on the same horizontal plane, so that the process of laying skids on site is avoided, and the engineering quantity is greatly simplified; and the arrangement of the upper sliding shoes ensures that the line shape of the variable-section steel box girder can be pushed and translated completely according to the line shape, and the quality of the variable-section steel box girder is effectively ensured. And the device has simple structure.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of a steel beam for hoisting a steel-concrete combined section according to the present invention;
FIG. 2 is a schematic structural view of the composite steel beam of the present invention;
FIG. 3 is a schematic view of the invention hoisting the large section steel beam and lowering it to the closure section area;
FIG. 4 is a schematic view of the pushing device of the present invention;
FIG. 5 is an enlarged view at A of FIG. 4;
fig. 6 is a schematic structural view of the fixing device of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 6, the present invention provides a construction method of a steel-concrete composite hybrid beam bridge, comprising the steps of: s1, simultaneously constructing the concrete beam section 1 on the adjacent bridge piers to form a front cantilever section of the beam section and a rear cantilever section of the beam section which are opposite; the initial zero block is cast in place by adopting a bracket, and the other blocks of the concrete beam section 1 are cast in a hanging basket in a hanging mode; s2, respectively hoisting and connecting the front cantilever section of the beam section and the rear cantilever section of the beam section with the steel beam 2 of the steel-concrete combined section; s3, hoisting a plurality of small section steel beams section by section to the surface of the constructed concrete beam section 1, and splicing the small section steel beams into a large section steel beam 3; s4, mounting a front guide beam 4 and a rear guide beam 5 at two ends of the large-section steel beam 3 to form a combined steel beam, and pushing the combined steel beam to be right above the closure section area through a pushing device; s5, hoisting a large-section steel beam 3 of the combined steel beam, cutting off a front guide beam 4 and a rear guide beam 5 connected with two ends of the large-section steel beam 3, vertically lowering the large-section steel beam 3 to a closure section area, connecting two ends of the large-section steel beam 3 with a steel beam 2 of a steel-concrete combined section, and closing to form an integral structure; s6, paving the bridge deck. The invention combines the cast-in-place method, the pushing method and the hoisting method, overcomes the construction conditions of poorer water transportation environment and larger wind wave, and forms the steel-concrete superposed mixed beam bridge with light structure dead weight and increased spanning capability. The steel beam of the steel-concrete combined section is positioned between the front cantilever section of the beam section and the rear cantilever section of the beam section. The steel beam of the steel-concrete combined section connected with the front cantilever section of the beam section, the steel beam of the steel-concrete combined section connected with the rear cantilever section of the beam section, and the interruption area between the two is the closure section area.
Big section girder steel 3 is variable cross section steel box girder, thrustor includes: a pair of rails including a first rail and a second rail; a pair of the first rails 9 provided at intervals in the longitudinal bridge direction at the front cantilever section of the constructed beam section on one side; the pair of second rails 10 are arranged at intervals in the longitudinal bridge direction at the rear cantilever section of the constructed beam section at the next pier position; the first bridge deck crane 6 is slidably erected on the first rail 9, and the first bridge deck crane 6 is fixedly connected with the rear guide beam 5; a plurality of pairs of upper shoes 8 fixed to the bottom plate of the combined steel beam at intervals in the longitudinal bridge direction; each pair of upper sliding shoes is oppositely arranged along the transverse bridge direction; the lower ends of the upper sliding shoes 8 are provided with through pin shaft holes, and the pin shaft holes of the upper sliding shoes are positioned on the same horizontal plane; the pair of lower sliding shoes 11 correspond to the pair of rails, and the two pairs of lower sliding shoes are arranged on the rails at intervals along the longitudinal bridge direction in a sliding manner; two pairs of oil cylinders 12 which are arranged on the track at intervals along the longitudinal bridge direction and are detachably arranged; each oil cylinder corresponds to a lower sliding shoe, and a piston rod of each oil cylinder is detachably fixed on the lower sliding shoe; and a second deck crane 7 erected and anchored at a rear cantilever section of the beam section constructed at the next pier position. In the construction process, the pin shaft penetrates through the pin shaft hole of the lower sliding shoe 11 and the pin shaft hole of the upper sliding shoe 8 to fix the two. A water tank is arranged at the rear end of the rear guide beam 5 to increase the balance weight, and the balance weight is arranged by a method of adding water into the water tank and pumping water. The pushing device is used for construction of the closure section, and in the construction process of the closure section, the pushing device pushes the combined steel beam arranged on the first rail to the rear cantilever section of the beam section where the second rail is arranged from the front cantilever section of the beam section where the first rail is arranged, and the variable-section box beam is positioned right above the closure section. In the pushing process, the positions of the two pairs of oil cylinders and the corresponding lower sliding shoes are adjusted, the lower sliding shoes are fixed with the upper sliding shoes at different positions on the combined steel beam, and the supporting points of the two pairs of oil cylinders are always guaranteed to be stressed. The number of the upper sliding shoes and the arrangement of the positions on the combined steel beam are required to ensure that the two pairs of oil cylinder pushing positions exist all the time in the pushing process. And a plurality of pairs of upper sliding shoes are fixed on the bottom plate of the combined steel beam at even intervals along the longitudinal bridge direction. The upper end of the lower sliding shoe is provided with a pin shaft hole, and a pin shaft penetrates through the pin shaft hole of the lower sliding shoe and the pin shaft hole of the upper sliding shoe to fix the lower sliding shoe and the upper sliding shoe in the construction process.
The concrete steps of the combined steel beam pushed by the pushing device are as follows: a1: installing a pushing device; a2: the two pairs of oil cylinders 12 are pushed simultaneously, and the combined steel beam is pushed forwards until the combined steel beam is right above the closure section area; a3: the connection between the first bridge deck crane 6 and the rear guide beam 5 is removed, and the first bridge deck crane 6 is anchored to the front cantilever section of the beam section; a4: anchoring a second bridge deck crane 7 on the rear cantilever section of the beam section constructed at the next pier position; a5: lifting the combined steel beam by using a lifting system, and dismantling the front guide beam and the rear guide beam 5; a6: the first bridge deck crane 6 and the second bridge deck crane 7 are matched to hoist and lower the variable cross-section box girder to the closure section; a7: connecting two ends of the variable cross-section box girder with steel girders of the steel-concrete combined section of the front cantilever section and the rear cantilever section of the girder section respectively to form a complete girder area structure; a8: and (5) dismantling the pushing device to finish construction.
The small-section steel beam 20 is transported to a construction area through a ship, the small-section steel beam 20 is fixed on the ship through a fixing device, and the fixing device comprises: four steel buttresses 14 fixed on the ship and forming four square corners; four skid groups 13 which correspond one-to-one to the steel buttresses 14 and which are provided on the upper surfaces of the steel buttresses 14 corresponding thereto; the four skid groups 13 are divided into two parallel pairs; each steel wire rope group comprises a first steel wire rope 15, a second steel wire rope 16 and a third steel wire rope 17 which are discontinuously arranged on the same vertical plane; each steel wire rope group corresponds to a pair of skid groups 13; one end of a first steel wire rope 15 is fixed on the ship, the other end of the first steel wire rope is fixed with one of the skid groups 13 and keeps loose, a second steel wire rope 16 is tensioned between the pair of skid groups 13, and a third steel wire rope 17 is tensioned between the other skid group 13 and a winch 18; the four turn-buckle bolts 19 are respectively arranged at four corners of the small-section steel beam 20, one end of each turn-buckle bolt 19 is fixed with one corner of the small-section steel beam 20, and the other end of each turn-buckle bolt 19 is fixed on the ship through a bolt. In the transportation process, a temporary fixing measure is made, and the steel wire rope pretightening force is applied to the basket bolts 19 to stabilize the small-section steel beam 20 on the barge so as to prevent the small-section steel beam 20 from overturning. Depending on the field conditions, the winch 18 may be replaced by human power. The gravity of the small-section steel beam 20 is supported by the skid group 13, and the inertial force thereof is provided by the turn buckle 19. After the first wire rope 15 is straightened, a pair of skid groups 13 corresponding to the first wire rope are all dropped from the steel buttress 14. Each skid group 13 includes three skids stacked up and down and fixed by bolts. Each skid group 13 comprises 3 layers of skids, the height of each layer of skids is 30cm, and the 3 layers of skids are fixedly connected together by steel plate bolts, so that the bearing capacity of the skid group 13 is increased.
The small-section steel beam 20 is transported to a construction area by a ship, and the specific steps include: b1, mounting a fixing device; b2, uniformly installing beam falling buffers on the surface of the constructed concrete beam section 1; b3, transporting the small section steel beam 20; b4, hoisting the small section steel beam 20; firstly, connecting a lifting appliance system of a crane ship with lifting lugs of small-section steel beams, and removing a fixing device before lifting; slowly lifting the hook until the crane has load, and releasing the bolt; observing the gap between the small section steel beam 20 and the skid group, and starting the winch 18 and pulling the skid group to separate the skid group from the corresponding steel buttress when the small section steel beam and the skid group have a tendency of being separated; b5, lowering the small section steel beam 20; the lower position of the beam-ends of the small-section steel beam 20 is controlled, and the shaking and the vibration in the lower process are eliminated through the beam falling buffer assistance before the hook falls. And the skid group 13 is quickly pulled open, so that the condition that the crane ship shakes to cause collision between the steel box girder and the buttress or the skid group 13 is avoided.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (3)
1. A construction method of a steel-concrete composite mixed beam bridge is characterized by comprising the following steps:
s1, constructing concrete beam sections on adjacent piers simultaneously to form a front cantilever section of the beam section and a rear cantilever section of the beam section which are opposite; the initial zero block is cast in place by adopting a bracket, and the other blocks of the concrete beam section are cast in suspension by adopting a hanging basket;
s2, respectively hoisting and connecting the front cantilever section of the beam section and the rear cantilever section of the beam section with steel beams of the steel-concrete combined section;
s3, hoisting a plurality of small section steel beams section by section to the surface of the constructed concrete beam section, and splicing the small section steel beams into a large section steel beam;
s4, mounting a front guide beam and a rear guide beam at two ends of the large-section steel beam to form a combined steel beam, and pushing the combined steel beam to be right above the closure section area through a pushing device;
s5, hoisting the large-section steel beam of the combined steel beam, cutting off a front guide beam and a rear guide beam connected with two ends of the large-section steel beam, vertically lowering the large-section steel beam to an closure section area, connecting two ends of the large-section steel beam with the steel beam of the steel-concrete combined section, and closing to form an integral structure;
s6, paving the bridge deck;
wherein, big section girder steel is variable cross section steel box girder, thrustor includes:
a pair of rails including a first rail and a second rail; a pair of the first rails provided at intervals in a longitudinal bridge direction at a front cantilever section of the constructed beam section on one side; the pair of second rails are arranged at intervals in the longitudinal bridge direction at the rear cantilever section of the constructed beam section at the next pier position;
the first bridge deck crane is slidably erected on the first track and is fixedly connected with the rear guide beam;
a plurality of pairs of upper shoes fixed to the bottom plate of the combined steel beam at intervals in the longitudinal bridge direction; each pair of upper sliding shoes is oppositely arranged along the transverse bridge direction; the lower ends of the upper sliding shoes are provided with through pin shaft holes, and the pin shaft holes of the upper sliding shoes are positioned on the same horizontal plane;
the two pairs of lower sliding shoes correspond to the pair of rails, and are arranged on the rails at intervals in the longitudinal bridge direction in a sliding manner;
the two pairs of oil cylinders are arranged on the track at intervals along the longitudinal bridge direction and are detachably arranged; each oil cylinder corresponds to a lower sliding shoe, and a piston rod of each oil cylinder is detachably fixed on the lower sliding shoe;
a second deck crane erected and anchored on a rear cantilever section of the beam section constructed at a next pier position;
the subsection girder steel passes through boats and ships and transports to the construction area, and the subsection girder steel passes through fixing device to be fixed on boats and ships, fixing device includes:
four steel buttresses which are fixed on the ship and form four square corners;
the four skid groups correspond to the steel buttresses one by one and are arranged on the upper surfaces of the corresponding steel buttresses; the four skid components are two pairs in parallel; each skid group comprises three skids which are overlapped up and down and fixed through bolts;
each steel wire rope group comprises a first steel wire rope, a second steel wire rope and a third steel wire rope which are discontinuously arranged on the same vertical plane;
each steel wire rope group corresponds to a pair of skid groups; one end of the first steel wire rope is fixed on the ship, the other end of the first steel wire rope is fixed with one of the skid groups and keeps loose, the second steel wire rope is tensioned between the pair of the skid groups, and the third steel wire rope is tensioned between the other skid group and the winch;
the four turn-buckle bolts are respectively arranged at four corners of the small section steel beam, one end of each turn-buckle bolt is fixed with one corner of the small section steel beam, and the other end of each turn-buckle bolt is fixed on the ship through a bolt.
2. The construction method of the steel-concrete composite hybrid beam bridge according to claim 1, wherein the concrete steps of pushing the combined steel beam by using the pushing device are as follows:
a1: installing a pushing device;
a2: pushing the two pairs of oil cylinders simultaneously to push the combined steel beam forwards until the combined steel beam is right above the closure section area;
a3: the connection between the first bridge deck crane and the rear guide beam is removed, and the first bridge deck crane is anchored to the front cantilever section of the beam section;
a4: anchoring a second bridge deck crane to the rear cantilever section of the beam section constructed at the next pier position;
a5: lifting the combined steel beam by using a lifting system, and dismantling the front guide beam and the rear guide beam;
a6: the first bridge deck crane and the second bridge deck crane are matched to hoist and place the variable cross-section box girder to the closure section;
a7: connecting two ends of the variable cross-section box girder with steel girders of the steel-concrete combined section of the front cantilever section and the rear cantilever section of the girder section respectively to form a complete girder area structure;
a8: and (5) dismantling the pushing device to finish construction.
3. The method of constructing a steel-concrete composite hybrid girder bridge according to claim 1, wherein the small-section steel girder is transported to a construction area by a ship, and the concrete steps include:
b1, mounting a fixing device;
b2, uniformly installing beam falling buffers on the surface of the constructed concrete beam section;
b3, transporting small section steel beams;
b4, hoisting small section steel beams; firstly, connecting a lifting appliance system of a crane ship with lifting lugs of small-section steel beams, and removing a fixing device before lifting;
slowly lifting the hook until the crane has load, and releasing the bolt;
observing a gap between the small section steel beam and the skid group, and starting the winch and pulling the skid group to separate the skid group from the corresponding steel buttress when the small section steel beam and the skid group have a tendency of being separated;
b5, lowering the small section steel beam; the lowering position of the beam end of the small-section steel beam is controlled, and shaking and vibration in the lowering process are eliminated through the assistance of the beam falling buffer before the hook falls.
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| CN201810200693.7A CN108547223B (en) | 2018-03-12 | 2018-03-12 | Steel-concrete superimposed hybrid beam bridge construction method |
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| CN201810200693.7A CN108547223B (en) | 2018-03-12 | 2018-03-12 | Steel-concrete superimposed hybrid beam bridge construction method |
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