CN117966613A - On-site ectopic assembling device and construction method for all-welded steel box girder combined beam - Google Patents
On-site ectopic assembling device and construction method for all-welded steel box girder combined beam Download PDFInfo
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- CN117966613A CN117966613A CN202410310952.7A CN202410310952A CN117966613A CN 117966613 A CN117966613 A CN 117966613A CN 202410310952 A CN202410310952 A CN 202410310952A CN 117966613 A CN117966613 A CN 117966613A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 151
- 239000010959 steel Substances 0.000 title claims abstract description 151
- 238000010276 construction Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000011066 ex-situ storage Methods 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims 1
- 238000003466 welding Methods 0.000 description 10
- 238000011065 in-situ storage Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
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- 239000000463 material Substances 0.000 description 2
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Abstract
The invention discloses an all-welded steel box girder combined beam on-site ectopic assembling device which comprises a beam body, a swivel support and a bearing support, wherein the swivel support is arranged on the beam body; the middle position of the bottom of the beam body is provided with a pier body; the bottom of the pier body is provided with a bearing platform; the swivel support comprises swivel upright posts, end cross beams and longitudinal beams; the two sides of the pier body are symmetrically provided with turning upright posts and longitudinal beams; the bottom of the rotating body upright post is connected to the top of the bearing platform; one side of the longitudinal beam is connected to the top of the pier body, and the other side of the longitudinal beam is connected to the top of the corresponding rotating body upright post; the end cross beam is arranged on one side of the longitudinal beam, which is far away from the pier body; bearing brackets are arranged on two sides of the swivel bracket; the top of the bearing bracket is arranged at the bottom of the beam body, and a construction method of the all-welded steel box girder combined beam is also disclosed. The invention forms the ectopic assembly device by arranging the swivel support and the bearing support, thereby constructing the steel box girder combined beam by adopting the ectopic assembly post-swivel method, greatly reducing the construction time of the existing line and reducing the interference to the existing railway.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to an on-site ectopic assembling device and a construction method for an all-welded steel box girder combined beam.
Background
The all-welded steel box girder combined girder bridge is a novel structure developed in recent years, the structural form is that the lower part is a steel box girder, the upper structure is a steel girder, the steel box girder combined girder bridge structure is designed to be a 10m triangle unit, the upper steel girder and the lower steel box girder are connected through a lower chord node, a rod piece is connected in a whole node plate welding form, and bridge deck construction is carried out after the construction of the steel box girder combined girder is completed. The steel box girder combined girder bridge is constructed across the existing railway line, has large construction difficulty and long period, is a line control engineering, and has the construction process of generally: the main pier body is constructed firstly, then a bracket is erected and a steel box girder combined beam is assembled along the existing railway direction, and finally swivel construction is carried out, wherein the steel box girder combined beam is constructed in a full welding way. However, the existing steel box girder combined girder bridge has the following problems in the construction process of existing railway crossing lines: 1. when the in-situ support method is erected, the hoisting equipment is arranged below, the road below is semi-closed or completely closed, and traffic is restricted; 2. when the single rod piece of the steel truss girder is hoisted, the steel truss girder belongs to the suspension splicing of the single rod piece, no positioning support exists on the bridge deck, the positioning difficulty is high, constructors do not have operation space, and the safety risk is high; 3. the steel truss girder node part is welded with a web member, a plurality of adjacent chord members and other members to form a truss structure, the dimensional accuracy among the members directly influences the assembly and linear dimension of the bridge structure, and the diagonal member web member at the steel truss girder node part is designed by butt welding; 4. the joint plates and the joint plates at the joint positions of the steel truss girder are all welded in a full penetration way, and meanwhile, the influence of longitudinal slopes, pre-arches and the like of a bridge on angles is comprehensively considered, so that the welding seam of the bridge has high quality requirement and large welding quantity, and welding deformation and stress concentration are easy to generate; 5. the box body is designed with more full penetration and groove penetration weld seams, so that the guarantee of welding quality and the control of welding deformation are more difficult; 6. the swivel construction is business line construction, and all departments are required to be matched and completed together, so that the safety risk is high.
Disclosure of Invention
In view of the above, the invention provides an on-site ectopic assembling device and a construction method for an all-welded steel box girder combined beam, which aim to solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
an all-welded steel box girder combined beam on-site ectopic assembling device, comprising:
A beam body; the middle position of the bottom of the beam body is provided with a pier body; the bottom of the pier body is provided with a bearing platform;
A swivel support; the swivel support comprises swivel upright posts, end cross beams and longitudinal beams; the swivel upright posts and the longitudinal beams are symmetrically arranged on two sides of the pier body; the bottom of the rotating body upright post is connected to the top of the bearing platform; one side of the longitudinal beam is connected to the top of the pier body, and the other side of the longitudinal beam is connected to the corresponding top of the rotating body upright post; the end cross beam is arranged on one side, far away from the pier body, of the longitudinal beam; the longitudinal beam is arranged at the bottom of the beam body;
A bearing bracket; the bearing brackets are arranged on two sides of the swivel bracket; the bearing support top set up in the roof beam body bottom, just the bearing support bottom sets up in bearing support basis top.
Preferably, the swivel bracket further comprises a middle cross beam and a swivel connecting rod; the middle cross beam is arranged on the longitudinal beam, and the middle cross beam is positioned between the pier body and the end cross beam; the swivel connecting rods are arranged on one side, close to the pier body, of each swivel upright post; the other side of each swivel connecting rod is connected to the pier body.
Preferably, the bearing bracket comprises a plurality of bearing upright posts, a supporting truss, a distribution beam, a difference adjusting steel plate, a drop plate and a slope adjusting jig; the plurality of bearing upright posts are arranged at the top of the bearing bracket foundation side by side; the supporting truss is arranged at the top of the bearing upright post; the distribution beam is arranged at the top of the support truss; the top of the distribution beam is provided with a plurality of difference adjustment steel plates; a drop-off plate is arranged at the top of each difference adjustment steel plate; the top of the unloading plate positioned at the two sides of the distribution beam is provided with the slope adjusting jig frame.
Preferably, the load bearing bracket further comprises a load bearing link; and the bearing connecting rods are arranged between the adjacent bearing upright posts.
Preferably, the top of the distribution beam is provided with an oil roof; and the oil top is arranged below each slope adjusting jig frame.
Preferably, the top of the distribution beam is provided with a beam top clamping groove matched with the difference adjustment steel plate; the Liang Dingka grooves are the same as the difference adjusting steel plates in number and are arranged in one-to-one correspondence.
The construction method of the all-welded steel box girder combined beam utilizes the on-site ectopic assembling device of the all-welded steel box girder combined beam, and comprises the following steps:
s1, scheme review, field arrangement and safety protocol signing;
s2, constructing an intermediate main pier, constructing a pile foundation, a bearing platform and a pier body of the intermediate main pier, and installing an embedded part for installing a swivel bracket on the intermediate main pier;
s3, constructing a steel box girder combined beam bracket foundation, constructing a bearing bracket foundation, and prepressing the bearing bracket foundation after the construction is finished;
S4, constructing a steel box girder combined beam bracket, and installing a swivel bracket and a bearing bracket by using an automobile crane;
S5, installing the steel box combined truss girder, and after the swivel support and the bearing support are installed, adopting an installation mode of firstly hoisting the lower steel box girder and then constructing the upper steel truss girder to construct the steel box combined truss girder;
s6, anticorrosive coating of the steel box girder combined beam;
s7, bridge deck and guardrail construction;
S8, unloading the steel box girder combined beam support, lifting the beam body by utilizing oil jacking at the top of the bearing support, dismantling an unloading plate at the top of the bearing support, slowly and synchronously unloading the beam by utilizing the oil jacking until the beam end falls down by a proper distance, then connecting the swivel support with a steel box girder combined beam bottom plate again, supporting to offset unbalanced bending moment at two sides, and then removing the oil jacking;
S9, turning the steel box girder combined girder, and turning the steel box girder combined girder clockwise to a proper angle;
S10, mounting supports and limiting devices at two ends of a steel box girder combined beam, and mounting the supports and the limiting devices at two ends of the steel box girder combined beam by using an automobile crane after turning is finished;
s11, dismantling the steel box girder combined beam support, and dismantling the rest bearing support and swivel support of the steel box girder combined beam when the automobile crane stands on one side far away from the existing line.
Preferably, during construction, both the truck crane and the crawler crane stand on the side away from the existing line.
Preferably, in the step S5, the concrete construction process of installing the steel box composite truss girder is as follows: the steel box girder sections are sequentially installed on two sides of the middle main pier, after the installation of the lower steel box girder is completed, the upper steel box girder sections are symmetrically installed from two sides to the middle by utilizing crawler cranes, wherein the positioning sections connected with the upper steel truss girder are symmetrically hoisted when the steel box girder sections are hoisted, the cross section is divided into nine sections, the hoisting is temporarily stopped before the two sections far away from one side of the existing line due to the limitation of the working radius of a crane, the upper steel truss girder rod piece is hoisted by adopting a bracket-free and matching plate positioning method, the upper beam is transversely hoisted firstly far away from one side of the existing line, and the two sides are synchronously connected with twenty-four groups of steel truss girder triangular units.
Preferably, in the step S8, after the oil top is removed, removing the part of the bearing bracket where the part interferes with the rotator bracket, removing the unloading plate, the difference adjusting steel plate and the slope adjusting jig on the bearing bracket during the removal, removing the distributing beam, the supporting truss, the bearing connecting rod, the bearing upright post and the bearing bracket foundation, and finally entering the preparation work before the rotator.
Compared with the prior art, the invention has the following technical effects:
1) The construction method of the steel box girder assembly Liang Yi-bit assembled rotating body is adopted, so that the construction time of the existing line is greatly reduced, and the interference to the existing railway is reduced;
2) In the invention, the steel box girder combination Liang Yi is assembled by adopting an in-situ bracket method, the brackets are arranged parallel to the existing wires, and the steel box girder is installed above the in-situ brackets and parallel to the existing wires, so that the welding quality and the assembling precision are ensured, and the construction period is saved;
3) According to the invention, the steel box girder combination Liang Yiwei is adopted for splicing construction, so that the crane equipment is always far away from one side of the existing line, and the influence on the existing line is greatly reduced;
4) The bearing bracket adopts an adjustable and gradually detachable structure, the steel box girder combined beam is used for adjusting the position of the steel box girder combined beam by detaching the landing plate when being installed, and the beam can be gradually dropped by the landing plate in the stage of converting the beam dropping of a stress system, so that the steel box girder combined beam is convenient to construct, convenient to operate, novel in structure and reusable;
5) The adjusting device disclosed by the invention is quick and simple in construction, the adjusting precision is improved, the line shape of the steel box girder combined beam is ensured, and a theoretical basis is provided for the subsequent bridge construction of the same type;
6) The invention saves the use cost of manpower, materials and machines.
Drawings
FIG. 1 is a schematic structural view of an all-welded steel box girder combined beam on-site ex-situ splicing device;
FIG. 2 is a schematic structural view of a swivel mount;
FIG. 3 is a schematic structural view of a load bearing bracket;
In the figure: 1. a beam body; 2. a pier body; 3. bearing platform; 4. a swivel support; 41. a swivel upright; 42. an end beam; 43. a longitudinal beam; 44. a middle cross beam; 45. a swivel link; 5. a bearing bracket; 51. a bearing upright post; 52. a support truss; 53. a distribution beam; 54. difference adjusting steel plates; 55. a stack of plates is unloaded; 56. slope adjusting jig frame; 57. a load-bearing connecting rod; 58. liang Dingka grooves; 6. and (3) oil top.
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.
Referring to fig. 1-3, the present invention provides an all-welded steel box girder combined beam on-site ectopic assembling device, comprising:
a beam body 1; the middle position of the bottom of the beam body 1 is provided with a pier body 2; the bottom of the pier body 2 is provided with a bearing platform 3;
A swivel bracket 4; the swivel bracket 4 comprises a swivel upright 41, an end cross beam 42 and a longitudinal beam 43; the two sides of the pier body 2 are symmetrically provided with a turning upright post 41 and a longitudinal beam 43; the bottom of the rotating body upright post 41 is connected to the top of the bearing platform 3; one side of the longitudinal beam 43 is connected to the top of the pier body 2, and the other side of the longitudinal beam 43 is connected to the top of the corresponding swivel upright 41; the end cross beam 42 is arranged on one side of the longitudinal beam 43 away from the pier body 2 and is used for connecting the longitudinal beam 43; the longitudinal beam 43 is arranged at the bottom of the beam body 1;
A load-bearing bracket 5; the two sides of the swivel support 4 are provided with bearing supports 5; the top of the bearing bracket 5 is arranged at the bottom of the beam body 1, and the bottom of the bearing bracket 5 is arranged at the top of the bearing bracket foundation.
According to the technical scheme, in the installation stage of the steel box girder combined beam, the swivel support 4 and the bearing support 5 are used as steel girder assembly supports for steel girder installation, and the swivel support longitudinal beam and the transverse beam have the same effect as the bearing support distribution beam and are used for supporting the steel girders in the pier top range; when the stress system is switched, the beam falling support is used for lifting the lower part of the beam end support steel plate, the stress of the bearing support is relieved, and after the beam falling, the beam body is supported again by the swivel support, so that unbalanced bending moment of the steel beam is counteracted.
In this embodiment, the swivel bracket 4 further includes a middle cross member 44 and a swivel link 45; the middle cross beam 44 is arranged on the longitudinal beam 43, and the middle cross beam 44 is positioned between the pier body 2 and the end cross beam 42 and is used for connecting the longitudinal beam 43; a swivel connecting rod 45 is arranged on one side of each swivel upright post 41 close to the pier body 2; the other side of each swivel connecting rod 45 is connected to the pier body 2.
In the present embodiment, the swivel posts 41 are disposed obliquely.
In the embodiment, an embedded part is arranged at the top of the bearing platform 3 and used for fixing the rotating body upright post 41; the pier body 2 is provided with an embedded part for fixedly mounting a swivel connecting rod 45; the top of the swivel upright 41 and the pier body 2 are provided with embedded parts for connection with the longitudinal beams 43.
In the present embodiment, the stringers 53 are provided with a pair of tie bars.
In this example, finish rolled deformed steel bars were used for the tie bars.
In this embodiment, the load bearing bracket 5 includes a plurality of load bearing columns 51, a support truss 52, a distribution beam 53, a leveling steel plate 54, a drop plate 55, and a leveling bed-jig 56; the plurality of bearing upright posts 51 are arranged on the top of the bearing bracket foundation side by side; the supporting truss 52 is arranged on the top of the bearing upright post 51; the distribution beams 53 are arranged on the top of the support truss 52; the top of the distribution beam 53 is provided with a plurality of difference adjusting steel plates 54; a drop-out plate 55 is arranged on the top of each difference adjustment steel plate 54; the top of the unloading plate 55 positioned on both sides of the distribution beam 53 is provided with a slope adjusting jig frame 56; the steel box girder combined beam is used for installing and adjusting the steel box girder combined beam by arranging the difference adjusting steel plate 54, the unloading plate 55 and the slope adjusting jig frame 56.
In this embodiment, the load bearing bracket 5 also includes a load bearing link 57; a load-bearing link 57 is provided between adjacent load-bearing columns 51.
In this embodiment, the top of the distribution beam 53 is provided with an oil roof 6; an oil top 6 is arranged below each slope adjusting jig frame 56.
In the embodiment, a beam top clamping groove 58 matched with the adjustment difference steel plate 54 is formed in the top of the distribution beam 53; liang Dingka grooves 58 are the same as the difference adjusting steel plates 54 in number and are arranged in a one-to-one correspondence.
In the embodiment, a bearing bracket and a swivel bracket are firstly constructed in parallel to the existing railway direction during construction, a bracket foundation is pre-pressed, in order to meet the construction requirement of adjacent existing lines, crawler crane equipment is hung on one side of a steel truss beam far away from the existing lines, a lower steel box beam is longitudinally installed from the middle to the two sides in sequence, two sections connected with a main truss are transversely firstly installed, the two sections are firstly installed in position after being measured and positioned by a code plate and then welded after being positioned, an upper steel truss beam is longitudinally installed from the two sides to the middle, one side of the upper steel truss beam far away from the existing lines is transversely firstly hoisted, the upper steel truss beam is welded after being positioned by a matching plate, and after all steel box trusses are qualified in adjustment welding flaw detection, the steel box truss beam bracket is unloaded, and the preparation work before the swivel is completed.
The invention also provides a construction method of the all-welded steel box girder combined beam, which utilizes the on-site ectopic assembling device of the all-welded steel box girder combined beam, and comprises the following steps:
s1, scheme review, field arrangement and safety protocol signing;
s2, constructing an intermediate main pier, constructing a pile foundation, a bearing platform 3 and a pier body 2 of the intermediate main pier, and installing a swivel support 4 on the intermediate main pier to install an embedded part for installation;
s3, constructing a steel box girder combined beam bracket foundation, constructing a bearing bracket foundation, and prepressing the bearing bracket foundation after the construction is finished;
s4, constructing a steel box girder combined beam bracket, and installing a swivel bracket 4 and a bearing bracket 5 by using an automobile crane;
s5, installing the steel box combined truss girder, and after the swivel support 4 and the bearing support 5 are installed, performing steel box combined truss girder construction by adopting an installation mode of firstly hoisting the lower steel box girder and then constructing the upper steel truss girder;
s6, anticorrosive coating of the steel box girder combined beam;
s7, bridge deck and guardrail construction;
S8, unloading the steel box girder combined beam support, lifting the beam body 1 by using the oil roof 6 at the top of the bearing support 5, removing the unloading plate 55 at the top of the bearing support 5, slowly and synchronously unloading the beam by using the oil roof 6 until the beam end falls down by 150mm, then connecting the swivel support 4 with the steel box girder combined beam bottom plate again, supporting to offset unbalanced bending moment at two sides, and then removing the oil roof 6;
S9, turning the steel box girder combined beam, and turning the steel box girder combined beam to 67 degrees along the clockwise direction;
S10, mounting supports and limiting devices at two ends of a steel box girder combined beam, and mounting the supports and the limiting devices at two ends of the steel box girder combined beam by using an automobile crane after turning is finished;
S11, dismantling the steel box girder combined beam support, and dismantling the rest bearing support 5 and the swivel support 4 of the steel box girder combined beam when the automobile crane stands on one side far away from the existing line.
In this embodiment, during construction, both the truck crane and the crawler crane stand on the side away from the existing line.
In this embodiment, the truck crane is a 30t truck crane, and the crawler crane is a 320t crawler crane.
In this embodiment, after the swivel bracket 4 and the load bearing bracket 5 are installed, pre-pressing is required.
In this embodiment, in S5, the concrete construction process for installing the steel box composite girder is as follows: the steel box girder sections are sequentially installed on two sides of the middle main pier, after the installation of the lower steel box girder is completed, the upper steel box girder sections are symmetrically installed from two sides to the middle by utilizing crawler cranes, wherein the steel box girder sections are firstly symmetrically hoisted to locate sections connected with the upper steel truss girder during hoisting, the cross section is divided into 9 sections, the hoisting is temporarily stopped before the two sections far away from one side of the existing line due to the limitation of the working radius of a crane, the upper steel truss girder rod piece is hoisted by adopting a bracket-free and matching plate locating method, the upper beam is transversely hoisted firstly far away from one side of the existing line, and the two sides are synchronously connected with 24 groups of steel truss girder triangular units.
In this embodiment, in S8, after the oil top 6 is removed, the part of the bearing bracket 5, the part of which interferes with the swivel bracket 4, is removed, and when the part is removed, the unloading plate 55, the difference adjusting steel plate 54 and the slope adjusting jig 56 on the bearing bracket 5 are removed, then the distributing beam 53, the supporting truss 52, the bearing connecting rod 57, the bearing upright post 51 and the bearing bracket foundation are removed, and finally the preparation work before the swivel is entered.
According to the invention, from the safety aspect, the hoisting equipment is far away from one side of the existing line, and the least adverse condition of the encroachment meets the construction requirement of the existing line; from the economic aspect, the material waste is reduced, and the cost is saved by repeated use; the position of the steel box girder combination Liang Zuobiao is more accurately positioned from the technical angle, and the adjustment is convenient and simple; the construction safety is guaranteed from the safety angle, the operation of workers is convenient, and the space is large. The invention ensures construction safety, economy and technical rationality, has important application value, and provides early exploration and precious experience for the construction of the all-welded steel box girder combined beams of the same type.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention still fall within the scope of the technical solutions of the present invention.
Claims (10)
1. The utility model provides a device is assembled to on-spot dystopy of all welded steel case purlin composite beam which characterized in that includes:
a beam body (1); the middle position of the bottom of the beam body (1) is provided with a pier body (2); a bearing platform (3) is arranged at the bottom of the pier body (2);
A swivel support (4); the swivel support (4) comprises swivel upright posts (41), end cross beams (42) and longitudinal beams (43); the two sides of the pier body (2) are symmetrically provided with the rotating body upright posts (41) and the longitudinal beams (43); the bottom of the rotating body upright post (41) is connected to the top of the bearing platform (3); one side of the longitudinal beam (43) is connected to the top of the pier body (2), and the other side of the longitudinal beam (43) is connected to the top of the corresponding rotating body upright post (41); the end cross beam (42) is arranged on one side of the longitudinal beam (43) away from the pier body (2); the longitudinal beam (43) is arranged at the bottom of the beam body (1);
a load-bearing bracket (5); the bearing brackets (5) are arranged on two sides of the swivel bracket (4); the top of the bearing support (5) is arranged at the bottom of the beam body (1), and the bottom of the bearing support (5) is arranged at the top of the bearing support foundation.
2. The on-site ectopic-splice device of the all-welded steel box girder combined beam as claimed in claim 1, wherein the swivel bracket (4) further comprises a middle cross beam (44) and a swivel connecting rod (45); the middle cross beam (44) is arranged on the longitudinal beam (43), and the middle cross beam (44) is positioned between the pier body (2) and the end cross beam (42); the side, close to the pier body (2), of each rotating body upright post (41) is provided with a rotating body connecting rod (45); the other side of each swivel connecting rod (45) is connected to the pier body (2).
3. The on-site ectopic-splice device of the all-welded steel box girder combined beam as claimed in claim 1 is characterized in that the bearing bracket (5) comprises a plurality of bearing upright posts (51), a supporting truss (52), a distributing beam (53), a difference adjusting steel plate (54), a drop plate (55) and a slope adjusting jig frame (56); the plurality of bearing upright posts (51) are arranged on the top of the bearing bracket foundation side by side; the support truss (52) is arranged at the top of the bearing upright post (51); the distribution beam (53) is arranged at the top of the support truss (52); the top of the distribution beam (53) is provided with a plurality of difference adjustment steel plates (54); a drop-out plate (55) is arranged at the top of each difference adjustment steel plate (54); the top of the unloading plate (55) positioned at the two sides of the distribution beam (53) is provided with the slope adjusting jig frame (56).
4. An all-welded steel box girder composite girder on-site ectopic-splice device as claimed in claim 3, wherein the bearing bracket (5) further comprises a bearing connecting rod (57); the bearing connecting rods (57) are arranged between the adjacent bearing upright posts (51).
5. The on-site ectopic-splice device of the all-welded steel box girder combined beam as claimed in claim 4, wherein the top of the distribution beam (53) is provided with an oil roof (6); and the oil roof (6) is arranged below each slope adjusting jig frame (56).
6. The on-site ectopic assembling device of the all-welded steel box girder combined beam as claimed in claim 5, wherein a beam top clamping groove (58) matched with the difference adjusting steel plate (54) is formed in the top of the distribution beam (53); the Liang Dingka grooves (58) are the same as the difference adjusting steel plates (54) in number and are arranged in one-to-one correspondence.
7. An all-welded steel box girder combined beam construction method, which is characterized by using the all-welded steel box girder combined beam on-site ex-situ splicing device as claimed in any one of claims 1 to 6, comprising the following steps:
s1, scheme review, field arrangement and safety protocol signing;
s2, constructing an intermediate main pier, constructing a pile foundation, a bearing platform (3) and a pier body (2) of the intermediate main pier, and installing a swivel support (4) on the intermediate main pier to install an embedded part for installation;
s3, constructing a steel box girder combined beam bracket foundation, constructing a bearing bracket foundation, and prepressing the bearing bracket foundation after the construction is finished;
S4, constructing a steel box girder combined beam bracket, and installing a swivel bracket (4) and a bearing bracket (5) by using an automobile crane;
S5, installing the steel box combined truss girder, and after the swivel support (4) and the bearing support (5) are installed, performing steel box combined truss girder construction by adopting an installation mode of firstly hoisting the lower steel box girder and then constructing the upper steel truss girder;
s6, anticorrosive coating of the steel box girder combined beam;
s7, bridge deck and guardrail construction;
s8, unloading the steel box girder combined beam support, lifting the beam body (1) by using an oil roof (6) at the top of the bearing support (5), dismantling an unloading plate (55) at the top of the bearing support (5), slowly and synchronously unloading the beam by using the oil roof (6) until a proper distance is reached to the beam end, then connecting the swivel support (4) with a steel box girder combined beam bottom plate again, supporting to offset unbalanced bending moment at two sides, and then dismantling the oil roof (6);
S9, turning the steel box girder combined girder, and turning the steel box girder combined girder clockwise to a proper angle;
S10, mounting supports and limiting devices at two ends of a steel box girder combined beam, and mounting the supports and the limiting devices at two ends of the steel box girder combined beam by using an automobile crane after turning is finished;
S11, dismantling the steel box girder combined beam support, and dismantling the rest bearing support (5) and the swivel support (4) of the steel box girder combined beam when the automobile crane stands on one side far away from the existing line.
8. The method for constructing an all-welded steel box girder composite girder according to claim 7, wherein the automobile crane and the crawler crane are respectively arranged at one side far from the existing line during the construction process.
9. The construction method of the all-welded steel box girder composite girder according to claim 7, wherein in the step S5, the concrete construction process of the steel box girder composite girder installation is as follows: and after the installation of the lower steel box girder is completed, the upper steel truss girder sections are symmetrically and sequentially installed from two sides to the middle by using crawler cranes from two sides.
10. The construction method of the all-welded steel box girder combined beam according to claim 7, wherein in the step S8, after the oil top (6) is removed, the part of the bearing bracket (5) with the part interfering with the swivel body of the swivel body bracket (4) is removed, and when the part of the bearing bracket (5) is removed, the unloading plate (55), the difference adjusting steel plate (54) and the slope adjusting jig (56) on the bearing bracket (5) are removed, and then the distributing beam (53), the supporting truss (52), the bearing connecting rod (57), the bearing upright post (51) and the bearing bracket foundation are removed, and finally the preparation work before the swivel body is entered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410310952.7A CN117966613A (en) | 2024-03-18 | 2024-03-18 | On-site ectopic assembling device and construction method for all-welded steel box girder combined beam |
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| CN202410310952.7A CN117966613A (en) | 2024-03-18 | 2024-03-18 | On-site ectopic assembling device and construction method for all-welded steel box girder combined beam |
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