CN112921827A - Construction method for hoisting large-span steel bridge box girder and hoisting and installing special-shaped component - Google Patents
Construction method for hoisting large-span steel bridge box girder and hoisting and installing special-shaped component Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E—FIXED CONSTRUCTIONS
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- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention provides a construction method for hoisting a large-span steel bridge box girder and hoisting and installing a special-shaped member, which comprises the following steps of construction preparation → segment division design → hoisting welding scheme analysis → crane model selection → foundation treatment → erection of a support system → special scheme review → hoisting implementation → technical improvement → steel arch hoisting analysis → innovative equidirectional double-hoisting scheme → hoisting completion → welding implementation, and hoisting the large-span steel bridge box girder and the special-shaped member; according to the invention, by optimizing the hoisting scheme, the segment size, the weight and the hoisting position are converted into a functional relation, hoisting equipment is reasonably configured and respectively corresponds to a construction road and a hoisting foundation, the construction difficulty is reduced, and the positioning precision is improved. And finally, the engineering quality is improved.
Description
Technical Field
The invention belongs to the field of bridge construction, and particularly relates to a construction method for hoisting a large-span steel bridge box girder and hoisting and installing a special-shaped member.
Background
Aiming at the box girder steel bridge with wider width, the hoisting engineering quantity is huge by combining the road transportation condition and the field installation condition according to the drawing and the standard requirement. The main bridge is of a single-box multi-chamber variable cross-section steel box girder structure, the steel box girder is assembled in a socket joint mode, and the tuyere of the box girder is an inclined plane, so that the hoisting difficulty is high; the arch rib is a hexagonal deformed section special-shaped component, the size is large, the tonnage is heavy, the closing of the bridge section can be guaranteed only by inclined socket assembling, the precision requirement of the component angle positioning point is very high, and therefore, the on-site hoisting and installation construction of the steel box girder bridge have important necessity for crane selection and application.
Disclosure of Invention
In view of the above, the invention aims to provide construction methods for hoisting a box girder of a long-span steel bridge and hoisting and installing special-shaped members, provides a construction method for the construction of a box girder steel bridge with a large width, and solves the problem of high hoisting difficulty.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the construction method for hoisting and installing the large-span steel bridge box girder and the special-shaped member comprises the following steps,
s1, segment division;
s2, selecting a crane;
1) selecting a crawler crane with the specification of 300t-400 t;
2) checking and calculating the worst hoisting working condition of the steel bridge box girder; checking and calculating working conditions of the highest section of the steel arch hoisted by the crawler crane under the bridge; checking and calculating the hoisting working condition of the middle cross beam;
s3, basic processing;
1) laying a construction channel;
2) selecting a bracket;
3) preparing a hoisting tool; preparing a lifting lug; preparing a steel wire rope; preparing a shackle;
s4, erecting a main beam support; 15-20 steel pipe supports are arranged below the butt welding seams of the main beam sections, each 3-8 steel pipes and corresponding connection systems are assembled to form a support hoisting unit in field support assembly, the connection systems between the two support hoisting units are hoisted by using parts, the longitudinal connection systems between the two adjacent section butt joint ring opening supports are firstly assembled on the ground to form hoisting units, and then hoisting is carried out by using a crawler crane below 100 t. The erection process comprises the following steps:
1) measuring the elevation of a pre-buried steel plate at the top of the pile foundation, and calculating the height of each support stand column steel pipe;
2) assembling a support hoisting unit near the corresponding support mounting position, and mounting and welding a column top steel plate and a stiffening plate;
3) hoisting the temporary support hoisting unit;
4) installing and welding connecting system I-shaped steel between adjacent support hoisting units;
5) hoisting the distribution beam, installing and welding a distribution beam butt splice plate after hoisting, and installing a jack anti-skid device on the distribution beam;
6) positioning the position of each adjusting pier steel pipe on the distribution beam, measuring the elevation, and calculating the height of the adjusting pier steel pipe;
7) assembling a longitudinal connecting system on the ground to form a hoisting unit;
8) hoisting longitudinal connecting system units, wherein the longitudinal connecting systems are sequentially installed from the center line of the road to two sides;
9) installing auxiliary facilities;
s5, erecting an arch rib bracket;
1) installing column bottom pad beams between the hoisting point cross beams, adjusting levelness, ensuring the close contact of gaps between the column bottom pad beams and the hoisting point cross beams by filling steel plates with different thicknesses, and fixing the column bottom pad beams and the hoisting point cross beams by welding stiffening plates;
2) measuring the elevation of the column bottom pad beam, and calculating the length of each upright column steel pipe;
3) assembling the hoisting unit and the longitudinal connecting system on the ground;
4) hoisting the upright steel pipe or the hoisting unit;
5) installing a connecting system and a ladder stand between double rows of upright posts;
6) installing auxiliary facilities;
s6, erecting a support upright post;
hoisting the steel support to a pile foundation by a crane, reserving a steel plate on the upper surface of the pile foundation in the early stage, and fixedly connecting a bottom flange plate of the upright column with the embedded plate through column feet in a stiffening manner;
s7, mounting a distribution beam; the I-steel lengthening butt joint adopts the butt joint of welding node plates, and a crane is adopted to hoist the double-spliced 56b I-steel distribution beam to the top surface of the steel pipe of the bracket, and the double-spliced 56b I-steel distribution beam is accurately arranged at the center of the steel pipe;
s8, building a construction platform;
1) the construction platform for welding and coating the transverse butt weld of the main beam sections adopts a temporary platform built on a temporary support; the longitudinal butt welding seam welding and coating are carried out by adopting a movable climbing vehicle; guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails;
2) the construction platform for welding and coating the butt weld of the arch rib sections adopts the method that a temporary platform is built on a temporary support; guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails;
s9, hoisting a box girder; the bridge width direction is spliced section by section from the middle to the two ends of the left breadth and the right breadth respectively; when the bridge pier meets the arch springing cross beam, the arch springing cross beam is hoisted firstly, other middle cross beams are hoisted after the left and right box girders are hoisted and welded,
1) hoisting 60+55+55m span steel beams in sequence: the steel box girder is hoisted from the No. 3 pier sequentially to the No. 2 pier, the No. 1 pier and the No. 0 pier and transversely and sequentially from the center of the bridge to the outside;
2) hoisting 90+55+55m span steel beams in sequence: the steel box girder is hoisted from the No. 3 pier sequentially to the No. 4 pier, the No. 5 pier and the No. 6 pier and transversely and sequentially from the center of the bridge to the outside;
s10, performing linear control on the hoisting process;
1) setting a geodetic coordinate network at a construction site;
2) the beam section is approximately a cuboid, a measurer marks the position of the beam section on the support distribution beam by lines according to the theoretical position of the first hanging beam section before hoisting, and sets the pre-camber of each span; mounting a jack anti-skid measure on the distribution beam;
3) measuring the positions of the side face and the port of a beam section on a distribution beam, and respectively arranging 20 channel steel as temporary limiting devices, wherein the beam section slowly descends along the channel steel during hoisting until the beam section falls on a buttress, and the buttress elevation is accurately measured and controlled before hoisting, so that the elevation adjustment amount of the steel beam is reduced;
4) the first hanging beam section is a transverse 8 th section close to the axis of the steel bridge, and after the first hanging beam section is hoisted and placed, constructors go up to the beam surface and measure according to existing measuring points of the beam surface; according to the measurement result, a jack is used for adjusting the elevation of the steel beam, the jack or a chain block is used for adjusting the horizontal position of the steel beam, and after the adjustment and measurement of the steel beam are qualified, the bottom of the box girder is fixed with the buttress in a spot welding manner, so that the displacement of the box girder caused by the collision of the next box girder is prevented; when the jack is jacked, a steel plate is needed to be arranged at the contact part of the top and the bottom of the beam, and the steel plate is used for increasing the contact area and preventing the steel beam bottom plate from local deformation caused by overlarge force;
5) after the first crane is positioned, hoisting the 7 th box girder of the section, wherein the 7 th girder section is closed and leveled by taking the first crane as a reference, then measuring the elevation and the coordinate, and adjusting the position of the girder section according to the measurement result; after positioning, stacking plates are adopted with the face bottom web plate of the head-hung box girder;
6) sequentially hoisting the 6 th box girder, the 5 th box girder, the 4 th box girder, the 3 rd box girder, the 2 nd box girder and the 1 st box girder of the section until the section is completely installed;
7) the second section of box girder reference block hoisting is the same as the step, and temporary limiting channel steel is erected on the distribution beam on the side surface of the box girder; during hoisting, the beam section slowly descends along the channel steel until the beam section falls on the buttress, and the port is matched with the previous section to ensure that the elevation and the sideline of the top and bottom plate are level;
s11, improving the technology;
1) the beam bottom base plate is formed by adding a lower vertical plate or an arc plate to the original traditional plane base plate, so that the thickness of the base plate is accurate and the base plate is completely stressed;
2) simulating inter-segment hoisting by using a BIM technology;
3) combining a network and an informatization technology, a lifting operation command system adopts an interphone, a camera is arranged below a lifting hook, and a display screen is arranged in a cab;
s12, hoisting a steel arch; the steel arch is divided into an A section and an M section in sequence;
1) preparing two truck cranes with the specification of 100 t; two ends of the arch foot A, M segments can be hoisted by a single machine, and the other segments are hoisted by two 100t truck cranes;
2) two truck cranes are adopted to lift the bridge deck, firstly, the top plate of the bridge deck needs to be protected safely, the landing leg area of the crane needs to be accurately positioned, and a road base plate is laid on the top plate. The road base plate is arranged above the partition plate, so that the stress point of the supporting leg of the stressed crane is ensured to be positioned at the partition plate;
3) firstly, hoisting segments at the arch springing part, sequentially hoisting each segment upwards, and finally hoisting closure segments; the steel arch is a special-shaped component, and the beam sections are assembled into inclined socket assembly; the double-crane same-side station is positioned on the bridge floor, the component is lifted from one side of the double-crane, penetrates through the gap and rotates to the opposite side, the component needs to rotate by 90 degrees in the process of transferring, and the double-crane needs to operate simultaneously;
4) hoisting 90 m-span arch rib segments, hoisting 60 m-span arch rib segments, and sequentially hoisting all the segments in sequence until the segments are finally folded;
s13, welding; the welding runs through the hoisting and mounting process of the box girder, and the hoisted box girder is welded according to special welding technological parameters in sequence.
Further, in step S1, dividing the steel box girder into 25 sections in the longitudinal direction, wherein the length of the steel box girder is 12m to 17.5m, each section of the main girder is divided into 8 pieces in the transverse half-width direction, and the total number of the sections is 400; the maximum external dimension of the main beam is 3200mm multiplied by 3302mm multiplied by 17500mm, and the maximum weight of a single piece is 40.44 t;
in step S1, dividing the steel arch rib segments in the length direction, and obtaining a maximum stage transportation length of about 16 m; the maximum external dimensions of the steel rib segments are 2000mm x 2400mm x 169900 mm.
Further, a crawler crane with the specification of 350t is selected, the length of an effective main arm of the crawler crane is 36m-84m, the center width of a crawler is 7.2m, and the length of the crawler is 8.7 m.
Further, in step S3, in step 1), the construction channel is used for the operation of the girder transporting vehicle and the 350t crawler crane, the construction channel is built on two sides of the bridge, the top elevation is 780.5m, the width is 12m, 500mm thick rubbles are paved and compacted on the upper part, and the ground pressure ratio reaches 180-200 Kpa;
further, in step S4; 16 steel pipe supports are arranged below the butt welding seams of the main beam sections, each 4 steel pipes and the corresponding connecting systems are assembled to form a support hoisting unit in field support assembly, and then 50-ton crawler cranes are used for hoisting.
Further, in step S4, in step S5), the distribution beam is a double-spliced 56b i-beam with a total length of 46m, and can be hoisted in 3-5 sections.
Further, in step S7, the i-beam lengthening butt joint is performed by welding the gusset plates, and the double-spliced 56b i-beam distribution beam is lifted to the top surface of the steel tube of the bracket by a crane and accurately arranged at the center of the steel tube.
Further, the size of the steel plate in 4) of step S10 is 20mm × 200mm × 200 mm.
Further, in step S10' S5), the size of yard board is 16mm x 150mm x 400mm, and every 2m sets up one, and a plurality of yards board spot welding are connected and are formed wholly for guarantee roof beam section safety, prevent this piece of case roof beam displacement because of next piece case roof beam striking leads to.
Compared with the prior art, the construction method for hoisting the large-span steel bridge box girder and hoisting and installing the special-shaped member has the following advantages:
(1) according to the construction method for hoisting the long-span steel bridge box girder and hoisting and installing the special-shaped member, the traditional road is a brick-soil mixed road built on two sides of the bridge, and the steel road base plate is laid below the crawler belt during hoisting, so that the construction period is shortened, the construction efficiency is improved, and the cost is reduced.
(2) According to the construction method for hoisting and installing the large-span steel bridge box girder and the special-shaped member, the steel arches with the arch heights of 22 meters and 15.2 meters are arranged on the central main span and the adjacent auxiliary spans of the bridge, the steel arches are special-shaped members, the closing can be guaranteed only by assembling the girder sections in an inclined socket joint mode, the gravity center of single-machine hoisting is easy to be unstable, the sections are not easy to match and install in place, the hoisting is carried out by innovating the same-direction double-hoisting technology, the smooth assembly can be effectively guaranteed, and the cost can be reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a transverse schematic view of a steel box girder according to an embodiment of the present invention;
FIG. 2 is a cross sectional view of a steel box girder according to an embodiment of the present invention;
FIG. 3 is a schematic representation of a steel arch rib according to an embodiment of the present invention;
FIG. 4 is a schematic view illustrating connection between a column and an embedded part according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a hoisting sequence from 60m to a small mileage according to an embodiment of the present invention;
FIG. 6 is a sequence diagram of 90m span-great-mileage hoisting according to an embodiment of the present invention;
FIG. 7 is a schematic view of a box girder according to an embodiment of the present invention;
fig. 8 is a schematic view of a steel arch hoisting sequence according to an embodiment of the present invention.
Description of reference numerals:
1. a box girder; 2. buttress; 3. a jack; 4. and (3) a steel plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The construction method for hoisting and installing the large-span steel bridge box girder and the special-shaped member comprises the following steps,
s1, segment division;
1) dividing steel box girder segments, longitudinally dividing the steel box girder into 25 segments with the length of 12-17.5 m, transversely dividing each segment of the main girder into 8 blocks in half width, and dividing into 400 segments in total; the transverse section diagram of the steel box girder is shown in figures 1 and 2;
2) according to design requirements and internal characteristics of the steel arch, production, transportation and installation schemes are considered, the steel arch is only segmented in the length direction, and the maximum length of segment transportation is about 16 m. The maximum external dimension is 2000 multiplied by 2400 multiplied by 169900 mm, and the maximum weight of a single piece is 38.5 t; the steel rib segment size is shown in fig. 3;
the cross beam is divided into 91 sections, the maximum external dimension is 10120 multiplied by 3200 multiplied by 4000mm, and the maximum weight of a single piece is 37 t.
S2, selecting a crane;
and determining to adopt an in-situ support method support system according to the field and transportation conditions, and selecting to respectively hoist and mount by mobile hoisting equipment on two sides according to a manufacturing sectional scheme. In principle, the bridge is symmetrically hoisted in the width direction, each transverse unit section is hoisted, and the unit sections are assembled and welded to the longitudinal joint of the box girder; and linear measurement adjustment and welding are carried out on the segment circular seams after all the two adjacent sections of longitudinal seams are welded and inspected to be qualified, the longitudinal seams at the cross-shaped welding seams are continuously welded, and a carbon arc air gouging is adopted to remove and polish the smooth groove when the circular seams are welded. The bridge pier and the arch foot cross beam are assembled with the box girder at the same time, and the middle hollow-out section cross beam is hoisted, assembled and welded after the left and right box girders are welded.
Construction roads are arranged on two sides of the beam transport vehicle and are used for a crane to travel, a crawler crane or an automobile crane is selected for hoisting, and a gantry crane is not arranged on site.
1) The comprehensive performance of the crawler crane and the truck crane is analyzed, the crawler crane has high grounding specific pressure and low requirement on roads, the construction in rainy seasons can be met, and the stability is good; the lifting device can walk during lifting operation, and has the advantages of flexible lifting, high lifting efficiency and the like. The hoisting safety can be improved, the hoisting progress is accelerated, and the road standard is reduced. According to the maximum segment weight and the maximum hoisting radius, through analysis, a 350T crawler crane is planned to be selected, two working faces are subjected to hoisting construction in the same direction on two sides of a steel bridge, a crawler crane with the specification of 350T is selected, the length of an effective main arm of the crawler crane is 36-84 m, the width of the center of a crawler is 7.2m, and the length of the crawler is 8.7 m;
the 350t crawler performance operating conditions are shown in the table below,
2) checking and calculating the worst hoisting working condition of the steel bridge box girder; checking and calculating working conditions of the highest section of the steel arch hoisted by the crawler crane under the bridge; checking and calculating the hoisting working condition of the middle cross beam;
checking and calculating the worst hoisting working condition of the steel bridge box girder: the number of the steel box girder main bridges is 400, the maximum hoisting weight is 40.44t, and the steel box girder main bridges are arranged at 90m cross-center positions; due to the limitation of a steel bridge supporting system, the crane station position is more than 3m away from the support supporting column, the distance between the cast-in-place pile at the outermost side of the longitudinal axis and the installation center position of the section is 17m, the self rotating radius of the QUY350 crawler crane is 4m, and the obtained hoisting radius is 3+17+ 4-24 m. The lowest elevation of the crane station is 780.5m, the elevation of the steel bridge deck is 791.5m, the elevation difference is 11m, the vertical length of the steel wire rope is set to be 8m, and the lifting height of the lifting hook is 11+8+1 which is 20 m. According to the hoisting height and hoisting radius parameters, construction operation is carried out under the working condition that the operating radius of the crawler crane is 24m and the length of the suspension arm is 54m, and the rated load of the crane under the working condition is 55.6 t.
The capacity of the working condition table of the middle-link QUY350 crawler crane is calculated according to the following formula:
g crane hoisting weight G0+ G1+ G2
Wherein G0 is the actual weight of the device, i.e., 40.44 t;
g1 is the weight of the hook, and is 0.6 t;
g2 is the weight of the lifting appliance, and is 0.4 t;
calculating according to the design standard of a crane;
g crane hoisting weight G0+ G1+ G2
＝40.44+0.6+0.4
＝41.44t
The load coefficient of the crane is G crane hoisting weight/G rated load
＝41.44/55.6＝74.53％，
According to the regulation that the load capacity of a single crane is not suitable to exceed 80% of the safe load capacity of the single crane, the hoisting of the steel box girder of the steel bridge meets the requirement, and the hoisting tool of the steel box girder is shown;
checking and calculating the working condition of the highest section of the steel arch hoisted by the crawler crane under the bridge: the steel bridge steel arch is divided into 13 sections, wherein the steel arch has the highest hoisting height and the weight of 25.3 t; calculating to obtain a hoisting radius of 21+4+ 3-28 m;
the lifting height of the lifting hook is 33.9+8+ 1-42.9 m. And determining the operating radius of the crawler crane to be 28m and the length of the suspension arm to be 66m according to the hoisting height and the hoisting radius parameters to carry out construction operation, wherein the rated load of the crane is 46.7t under the operating condition.
The capacity of the working condition table of the middle-link QUY350 crawler crane is calculated according to the following formula:
g crane hoisting weight G0+ G1+ G2
Wherein G0 is the actual weight of the device, i.e., 25.3.0 t;
g1 is the weight of the hook, and is 0.6 t;
g2 is the weight of the lifting appliance, and is 0.4 t;
calculating according to the design standard of a crane;
g crane hoisting weight G0+ G1+ G2
＝25.3+0.6+0.4
＝26.3t
The load coefficient of the crane is G crane hoisting weight/G rated load
＝26.3/46.7＝56.32％，
According to the regulation that the load capacity of a single crane is not suitable to exceed 80% of the safe load capacity of the single crane, the hoisting capacity meets the hoisting requirement of the steel arch;
hoisting the middle cross beam: mainly to steel bridge crossbeam, and the segmentation hoist and mount of steel bridge arch springing, steel bridge crossbeam heaviest festival section 37t, steel bridge arch springing heaviest festival section 38.5t, the hoist and mount operating mode of steel bridge crossbeam and arch springing is the same, uses the biggest weight to be 38.5t arch springing as an example and carries out hoist and mount operating mode checking calculation:
350t of channels on two sides of a main beam of a crane station, wherein the maximum operation radius is 27m, the length of a suspension arm is 54m, the maximum block hoisting weight is about 38.5t, and the rated hoisting capacity is that the rated load of a working condition crane is (52+47.2)/2 which is 49.6 t. Considering the weight of a lifting hook and a lifting appliance of 1 ton and a safety factor of 0.8 time, 49.6 x 0.8-1-38.68 t is more than or equal to 38.5t, and the requirement is met. Therefore, the hoisting working condition is determined to meet the hoisting requirements of all the cross beams and the arch springing segments.
S3, basic processing;
1) laying a construction channel; the construction road foundation is designed according to the conventional method, and a construction channel is paved for the operation of a beam transporting vehicle and a 350t crawler crane. The construction channels are built on two sides of the bridge, the elevation of the top of the construction channels is 780.5m, and the width of the construction channels is 12 m. The allowable value of the bearing capacity of the undisturbed soil foundation is 100-120Kpa, the grounding specific pressure of the crane under the worst working condition is 151Kpa, and the requirement of the hoisting working condition cannot be met, so that 500mm thick rubble is paved and compacted on the upper part, the grounding specific pressure can reach 180-200Kpa, and the requirement of the hoisting construction can be met.
A) Optimized road scheme
In view of the shortage of engineering period, the scheme is optimized and improved in combination with the current situation of the site: the construction road is rolled by mixing bricks and earth, so that the road repairing time is shortened, and the road repairing cost is reduced. In order to improve the bearing capacity and meet the hoisting safety, a steel road base plate can be paved below the crawler belt, so that the hoisting safety is ensured.
B) Specification of steel road base plate
Steel road base board: the length and width of one side is 8m 2m, which is 16 square meters, so the total load-bearing area is 32 square meters.
C) Temporary road paving
The temporary road is paved with a brick-soil mixture with the thickness of 0.5m and the width of 12m, the mixing ratio is 5:5, and the bearing capacity test after compaction is 140-150 Kpa.
D) Calculation of roadbed bearing capacity under hoisting working condition
(a) Load weight: 280t of QUY350 type crawler crane, 40.44t of maximum hoisting weight, 1t of mass of a lifting hook and a lifting appliance and 321.44t of total load. Considering the 1.2 times of safety factor as: 386 t.
(b) Road substrate bearing area: square meter of 32 square
(c) And (3) specific pressure of ground connection: 386 x 9.8/32 ═ 118 Kpa.
(d) And (4) conclusion: the roadbed bearing capacity is greater than the grounding specific pressure, and the requirement of hoisting the maximum weight of the 350t crawler crane is met.
2) Selecting a bracket; the main pipe of the main beam support adopts phi 609 multiplied by 16, the connecting system adopts I14, the distribution beam adopts double-spliced I56b I-steel, the top of the distribution beam is provided with a splicing fulcrum and a reinforcing steel plate, and is provided with a jack antiskid device. A temporary platform is built on a temporary support for the construction platform for welding and coating transverse butt welds of the main beam sections. And the longitudinal butt welding seam welding and coating are carried out by adopting a movable climbing vehicle. Guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails; the main pipe of the steel arch temporary support adopts double rows of phi 609 multiplied by 16mm steel pipes, the connecting system adopts phi 273 multiplied by 8 and phi 169 multiplied by 6 steel pipes, the support base and the distribution beam are all made of HM440 multiplied by 300 section steel, the support base is made of a three-spliced HM440 multiplied by 300 section steel, and the base and the hoisting point cross beam top plate are welded and fixed.
3) Preparing a hoisting tool; the preparation lug, steel case roof beam installation lug set up on the girder steel panel, correspond with the crossing position of girder steel web and horizontal diaphragm structure, need not the web position and need consolidate. Each section of steel box girder is provided with four lifting lugs which are arranged in a diagonal manner, so that the lifting resultant force of the steel girder and the gravity center of the steel girder are on the same straight line; selecting through a lifting lug specification model selection table, wherein the selection is shown in the following table;
preparing a steel wire rope, wherein the heaviest beam section of the project weighs about 40t, and taking the lifting hook and the steel wire rope to weigh 1 t. And hoisting load G (G1 + G2) 400KN +10KN (410 KN) by using 4 strands of steel wire ropes. When in hoisting, the included angle between the steel wire rope and the horizontal plane is not less than 45 degrees. The minimum included angle between the pulling force F borne by the steel wire rope and the gravity G of the steel box girder is between 90 degrees and 45 degrees
The stress of the four steel wire ropes is calculated, and the tension F of a single steel wire rope during hoisting is (calculated according to the most unfavorable working condition):
Looking up an important purpose steel wire rope GB8918-2006, a steel core steel wire rope of 6 multiplied by 37 (the diameter is 54mm) is proposed, the nominal tensile strength of the steel wire rope is 1870MPa, and the breaking tension of the steel wire rope is 1940kN by looking up the table.
The allowable tension F of the steel wire rope is 1940/8 (safety factor) 242KN and F is 228KN, namely the requirement is met.
Preparing a shackle, calculating the tension 228KN of the single steel wire rope, namely the shackle bearing weight according to 23t according to the steel wire rope calculation result, considering the safety factor of 2 times, and referring to a shackle standard (JB 8112-; as shown in the shackle selection table of the following table;
s4, erecting a main beam support; 16 steel pipe supports are arranged below the butt welding seams of the main beam sections, every 4 steel pipes and corresponding connection systems are assembled to form a support hoisting unit in field support assembly, the connection systems between the two support hoisting units are hoisted by using parts, the longitudinal connection systems between the two adjacent section butt joint ring opening supports are firstly assembled on the ground to form hoisting units, and then hoisting is carried out by using a 50-ton crawler crane. The erection process comprises the following steps:
1) measuring the elevation of a pre-buried steel plate at the top of the pile foundation, and calculating the height of each support stand column steel pipe;
2) assembling a support hoisting unit near the corresponding support mounting position, and mounting and welding a column top steel plate and a stiffening plate;
3) hoisting the temporary support hoisting unit;
4) installing and welding connecting system I-shaped steel between adjacent support hoisting units;
5) hoisting the distribution beam, wherein the distribution beam is a double-spliced 56b I-shaped steel, has a total length of 46m, can be hoisted by 3-5 sections, is provided with a welded distribution beam butt splice plate after hoisting, and is provided with a jack anti-skid device;
6) positioning the position of each adjusting pier steel pipe on the distribution beam, measuring the elevation, and calculating the height of the adjusting pier steel pipe;
7) assembling a longitudinal connecting system on the ground to form a hoisting unit;
8) hoisting longitudinal connecting system units, wherein the longitudinal connecting systems are sequentially installed from the center line of the road to two sides;
9) installing auxiliary facilities;
s5, erecting an arch rib bracket;
1) installing column bottom pad beams between the hoisting point cross beams, adjusting levelness, ensuring the close contact of gaps between the column bottom pad beams and the hoisting point cross beams by filling steel plates with different thicknesses, and fixing the column bottom pad beams and the hoisting point cross beams by welding stiffening plates;
2) measuring the elevation of the column bottom pad beam, and calculating the length of each upright column steel pipe;
3) assembling the hoisting unit and the longitudinal connecting system on the ground;
4) hoisting the upright steel pipe or the hoisting unit;
5) installing a connecting system and a ladder stand between double rows of upright posts;
6) installing auxiliary facilities;
s6, erecting a support upright post;
hoisting the steel support to a pile foundation by a crane, reserving a steel plate on the upper surface of the pile foundation in the early stage, and fixedly connecting a flange plate at the bottom of the upright post and the embedded plate through a post foot by stiffening, as shown in FIG. 4;
s7, installing the distribution beam,
the distribution beam is manufactured by double splicing I56b H-shaped steel, the longest distribution beam is 46m, the I-shaped steel is lengthened and butted by adopting a welding gusset plate, and the double-spliced 56b H-shaped steel distribution beam is lifted to the top surface of the steel pipe of the bracket by adopting a crane and accurately arranged at the center of the steel pipe; the distribution beam is prevented from generating eccentricity under the action of upper load, so that the structure is prevented from being adversely affected and uneven stress is avoided.
S8, building a construction platform;
1) the construction platform for welding and coating the transverse butt weld of the main beam sections adopts a temporary platform built on a temporary support; the longitudinal butt welding seam welding and coating are carried out by adopting a movable climbing vehicle; guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails;
2) the construction platform for welding and coating the butt weld of the arch rib sections adopts the method that a temporary platform is built on a temporary support; guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails;
transporting the beam sections; the arch rib subsection is transferred to a main beam hoisting area by adopting a flat car, a top plate faces upwards when the subsection is transferred and loaded, the subsection does not need to be turned over during hoisting, and a transportation bracket needs to be manufactured on the flat car. When in transportation, the sections need to be bound and fixed by chain blocks, and the number of the binding is not less than two;
s9, hoisting a box girder; in order to avoid risks caused by the growth of river water in the flood season, a plurality of installation working faces can be effectively unfolded, and the mode that the installation and hoisting are sequentially carried out from the joint of 90m span and 60m span in the middle of a river to two ends is adopted; the bridge width direction is spliced section by section from the middle to the two ends of the left breadth and the right breadth respectively; when the bridge pier meets the arch springing cross beam, the arch springing cross beam is hoisted firstly, and other middle cross beams are hoisted after the left and right box girders are hoisted and welded.
1) Hoisting 60+55+55m span steel beams in sequence: the steel box girder is hoisted from the No. 3 pier sequentially to the No. 2 pier, the No. 1 pier and the No. 0 pier and transversely and sequentially from the center of the bridge to the outside; as shown in figure 5 of the drawings,
2) hoisting 90+55+55m span steel beams in sequence: the steel box girder is hoisted from the No. 3 pier sequentially to the No. 4 pier, the No. 5 pier and the No. 6 pier and transversely and sequentially from the center of the bridge to the outside; as shown in fig. 6;
s10, performing linear control on the hoisting process;
1) setting a geodetic coordinate system and a whole engineering measurement system by a monitoring unit, and setting a geodetic coordinate network on a construction site to ensure that the set geodetic coordinate system is consistent with geodetic coordinates given by design;
2) the beam section is approximately a cuboid, a measurer marks the position of the beam section on the support distribution beam by lines according to the theoretical position of the first hanging beam section before hoisting, and sets the pre-camber of each span; mounting a jack anti-skid measure on the distribution beam;
3) in order to guarantee the plane position of the first-hanging reference beam block, the side face and the port position of a beam section are measured on the distribution beam, 20 channel steel is respectively arranged as temporary limiting devices, the beam section slowly descends along the channel steel during hanging until the beam section falls on the buttress, the buttress elevation is accurately measured and controlled before hanging, and the elevation adjustment amount of the steel beam is reduced;
4) the first hanging beam section is a transverse 8 th section close to the axis of the steel bridge, and after the first hanging beam section is hoisted and placed, constructors go up to the beam surface and measure according to existing measuring points of the beam surface; according to the measurement result, a jack 3 is adopted to adjust the elevation of the steel beam, the jack 3 or a chain block adjusts the horizontal position of the steel beam, and after the adjustment and measurement of the steel beam are qualified, the bottom of the box girder 1 and the buttress 2 are fixed in a spot welding manner, so that the displacement of the box girder caused by the collision of the next box girder is prevented; when the jack 3 is jacked, a steel plate 4 with the thickness of 20mm multiplied by 200mm needs to be arranged at the contact part of the top and the bottom of the beam for increasing the contact area and preventing the steel beam bottom plate from local deformation caused by overlarge force; as shown in fig. 7;
5) after the first crane is positioned, hoisting the 7 th box girder of the section, wherein the 7 th girder section is closed and leveled by taking the first crane as a reference, then measuring the elevation and the coordinate, and adjusting the position of the girder section according to the measurement result; after positioning, the box girder and a bottom web plate of the first hanging box girder adopt code plates, the code plates are 16 × 150 × 400mm, and one code plate is arranged every 2m and connected into a whole in a spot welding mode to ensure the safety of a girder section and prevent the displacement of the box girder due to the collision of the next box girder;
6) sequentially hoisting the 6 th box girder, the 5 th box girder, the 4 th box girder, the 3 rd box girder, the 2 nd box girder and the 1 st box girder of the section until the section is completely installed;
7) the second section of box girder reference block hoisting is the same as the step, and temporary limiting channel steel is erected on the distribution beam on the side surface of the box girder; during hoisting, the beam section slowly descends along the channel steel until the beam section falls on the buttress, and the port is matched with the previous section to ensure that the elevation and the sideline of the top and bottom plate are level; the subsequent beam section is similar to the previous section;
s11, improving the technology;
1) the beam bottom base plate is formed by adding a lower vertical plate or an arc plate to the original traditional plane base plate, so that the thickness of the base plate is accurate and the base plate is completely stressed;
2) simulating inter-segment hoisting by using a BIM technology;
3) combining a network and an informatization technology, a lifting operation command system adopts an interphone, a camera is arranged below a lifting hook, and a display screen is arranged in a cab;
s12, hoisting a steel arch; the steel arch is divided into an A section and an M section in sequence;
1) the steel arch hoisting is that the crawler crane needs to be idle or enter a field for the second time after the box girder is welded. According to the construction progress, the method combines the actual situation of the site, fully adopts green construction for avoiding causing the resource waste of large-scale equipment, simultaneously considers the stability of hoisting of the special-shaped component, and optimizes the hoisting scheme of the steel arch. As each section of the steel arch is an irregular member, the single crane is unstable in lifting and the like, the 350-ton crawler crane selected in the original scheme for lifting is changed into two 100-ton truck crane deck operations for lifting the construction road under the bridge through research and demonstration; analyzing the hoisting working conditions of each section of the steel arch, as shown in the table below, wherein two ends of the arch springing A, M sections can be hoisted by a single machine, and the rest sections are supposed to be hoisted by two 100-ton truck cranes;
| serial number | Numbering | Weight (t) | Radius of operation (m) | Boom length (m)2) | Rated load (t) | Remarks for note |
| 1 | GA | 13.77 | 9.00 | 26.50 | 32.5 | Single machine hoisting |
| 2 | GB | 25.95 | 9.00 | 26.50 | 32.5 | Double- |
| 3 | GC | 24.99 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 4 | GD | 19.92 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 5 | GE | 25.04 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 6 | GF | 35.02 | 7.00 | 26.50 | 39 | Double-crane lifting crane |
| 7 | GG | 26.93 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 8 | GH | 24.06 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 9 | GI | 25.29 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 10 | GJ | 26.56 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 11 | GK | 32.31 | 7.00 | 26.50 | 39 | Double- |
| 12 | GL | 27.76 | 9.00 | 26.50 | 32.5 | Double-crane lifting crane |
| 13 | GM | 14.42 | 9.00 | 26.50 | 32.5 | Single machine hoisting |
The lifting performance of a truck crane of 100t is shown in the following table;
simulating the crane operation radius and the crane arm length under the hoisting working condition of each segment according to the weight of the hoisting beam segment and the crane hoisting performance;
2) two truck cranes are adopted to lift the bridge deck, firstly, the top plate of the bridge deck needs to be protected safely, the landing leg area of the crane needs to be accurately positioned, and a road base plate is laid on the top plate. The road base plate is arranged above the partition plate, so that the stress point of the supporting leg of the stressed crane is ensured to be positioned at the partition plate;
3) firstly, hoisting segments at the arch springing part, sequentially hoisting each segment upwards, and finally hoisting closure segments; the steel arch is a special-shaped component, the beam sections are assembled into inclined socket assembling, closure can be guaranteed, the gravity center is easy to destabilize when the single-machine hoisting is applied, the section matching installation is not easy to be in place, the hoisting scheme is optimized, the equidirectional double-hoisting technology is innovated for hoisting, smooth assembly can be effectively guaranteed, safety is guaranteed, efficiency is improved, and cost can be reduced; the double-crane same-side station is positioned on the bridge floor, the component is lifted from one side of the double-crane, penetrates through the gap and rotates to the opposite side, the component needs to rotate by 90 degrees in the process of transferring, and the double-crane needs to operate simultaneously;
4) hoisting 90m span arch rib segments, hoisting 60m span arch rib segments, and sequentially hoisting all the segments in sequence until the segments are finally folded. The hoisting sequence is shown in figure 8;
s13, welding; the welding runs through the hoisting and mounting process of the box girder, the hoisted box girder is welded according to special welding process parameters in sequence, and the box girder is qualified after inspection; dismantling a steel arch, mounting the steel beam and the steel arch, the sidewalk and the guardrail, welding, and performing paint coating and full-bridge finish paint spraying after the welding is finished and the detection is qualified; and (5) dismantling the girder support, cleaning the site and withdrawing.
The method is successfully applied to the large-span steel bridge box girder hoisting and special-shaped member hoisting installation of the comprehensive channel PPP project natural and river bridge engineering in Shanxi jin, and the flexible applicability, the economical efficiency and the safety and the reliability of the technology are verified. By optimizing the hoisting scheme, the segment size, the weight and the hoisting position are converted into a functional relation, hoisting equipment is reasonably configured and respectively corresponds to a construction road and a hoisting foundation; the camera is arranged under the lifting hook, and the display screen is arranged in the cab, so that a crane driver can accurately judge the position of a hanging object, and the mounting precision is ensured; according to local conditions, a double-crane hoisting mode on the bridge, a truck crane auxiliary mode additionally arranged at the center section of the riverbed and other modes are created, the safe and smooth implementation of the project is ensured, and a good effect is achieved. Can be popularized and applied to similar bridge construction, and has certain social benefit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The construction method for hoisting and installing the large-span steel bridge box girder and the special-shaped member is characterized in that: comprises the following steps of (a) carrying out,
s1, segment division;
s2, selecting a crane;
1) selecting a crawler crane with the specification of 300t-400 t;
2) checking and calculating the worst hoisting working condition of the steel bridge box girder; checking and calculating working conditions of the highest section of the steel arch hoisted by the crawler crane under the bridge; checking and calculating the hoisting working condition of the middle cross beam;
s3, basic processing;
1) laying a construction channel;
2) selecting a bracket;
3) preparing a hoisting tool; preparing a lifting lug; preparing a steel wire rope; preparing a shackle;
s4, erecting a main beam support; 15-20 steel pipe supports are arranged below the butt welding seams of the main beam sections, each 3-8 steel pipes and corresponding connection systems are assembled to form a support hoisting unit in field support assembly, the connection systems between the two support hoisting units are hoisted by using parts, the longitudinal connection systems between the two adjacent section butt joint ring opening supports are firstly assembled on the ground to form hoisting units, and then hoisting is carried out by using a crawler crane below 100 t. The erection process comprises the following steps:
1) measuring the elevation of a pre-buried steel plate at the top of the pile foundation, and calculating the height of each support stand column steel pipe;
2) assembling a support hoisting unit near the corresponding support mounting position, and mounting and welding a column top steel plate and a stiffening plate;
3) hoisting the temporary support hoisting unit;
4) installing and welding connecting system I-shaped steel between adjacent support hoisting units;
5) hoisting the distribution beam, installing and welding a distribution beam butt splice plate after hoisting, and installing a jack anti-skid device on the distribution beam;
6) positioning the position of each adjusting pier steel pipe on the distribution beam, measuring the elevation, and calculating the height of the adjusting pier steel pipe;
7) assembling a longitudinal connecting system on the ground to form a hoisting unit;
8) hoisting longitudinal connecting system units, wherein the longitudinal connecting systems are sequentially installed from the center line of the road to two sides;
9) installing auxiliary facilities;
s5, erecting an arch rib bracket;
1) installing column bottom pad beams between the hoisting point cross beams, adjusting levelness, ensuring the close contact of gaps between the column bottom pad beams and the hoisting point cross beams by filling steel plates with different thicknesses, and fixing the column bottom pad beams and the hoisting point cross beams by welding stiffening plates;
2) measuring the elevation of the column bottom pad beam, and calculating the length of each upright column steel pipe;
3) assembling the hoisting unit and the longitudinal connecting system on the ground;
4) hoisting the upright steel pipe or the hoisting unit;
5) installing a connecting system and a ladder stand between double rows of upright posts;
6) installing auxiliary facilities;
s6, erecting a support upright post;
hoisting the steel support to a pile foundation by a crane, reserving a steel plate on the upper surface of the pile foundation in the early stage, and fixedly connecting a bottom flange plate of the upright column with the embedded plate through column feet in a stiffening manner;
s7, mounting a distribution beam; the I-steel lengthening butt joint adopts the butt joint of welding node plates, and a crane is adopted to hoist the double-spliced 56b I-steel distribution beam to the top surface of the steel pipe of the bracket, and the double-spliced 56b I-steel distribution beam is accurately arranged at the center of the steel pipe;
s8, building a construction platform;
1) the construction platform for welding and coating the transverse butt weld of the main beam sections adopts a temporary platform built on a temporary support; the longitudinal butt welding seam welding and coating are carried out by adopting a movable climbing vehicle; guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails;
2) the construction platform for welding and coating the butt weld of the arch rib sections adopts the method that a temporary platform is built on a temporary support; guard rails are arranged around the construction platform by adopting angle steels and steel bars, and dense mesh type safety net protection is arranged around the guard rails;
s9, hoisting a box girder; the bridge width direction is spliced section by section from the middle to the two ends of the left breadth and the right breadth respectively; when the bridge pier meets the arch springing cross beam, the arch springing cross beam is hoisted firstly, other middle cross beams are hoisted after the left and right box girders are hoisted and welded,
1) hoisting 60+55+55m span steel beams in sequence: the steel box girder is hoisted from the No. 3 pier sequentially to the No. 2 pier, the No. 1 pier and the No. 0 pier and transversely and sequentially from the center of the bridge to the outside;
2) hoisting 90+55+55m span steel beams in sequence: the steel box girder is hoisted from the No. 3 pier sequentially to the No. 4 pier, the No. 5 pier and the No. 6 pier and transversely and sequentially from the center of the bridge to the outside;
s10, performing linear control on the hoisting process;
1) setting a geodetic coordinate network at a construction site;
2) the beam section is approximately a cuboid, a measurer marks the position of the beam section on the support distribution beam by lines according to the theoretical position of the first hanging beam section before hoisting, and sets the pre-camber of each span; mounting a jack anti-skid measure on the distribution beam;
3) measuring the positions of the side face and the port of a beam section on a distribution beam, and respectively arranging 20 channel steel as temporary limiting devices, wherein the beam section slowly descends along the channel steel during hoisting until the beam section falls on a buttress, and the buttress elevation is accurately measured and controlled before hoisting, so that the elevation adjustment amount of the steel beam is reduced;
4) the first hanging beam section is a transverse 8 th section close to the axis of the steel bridge, and after the first hanging beam section is hoisted and placed, constructors go up to the beam surface and measure according to existing measuring points of the beam surface; according to the measurement result, a jack is used for adjusting the elevation of the steel beam, the jack or a chain block is used for adjusting the horizontal position of the steel beam, and after the adjustment and measurement of the steel beam are qualified, the bottom of the box girder is fixed with the buttress in a spot welding manner, so that the displacement of the box girder caused by the collision of the next box girder is prevented; when the jack is jacked, a steel plate is needed to be arranged at the contact part of the top and the bottom of the beam, and the steel plate is used for increasing the contact area and preventing the steel beam bottom plate from local deformation caused by overlarge force;
5) after the first crane is positioned, hoisting the 7 th box girder of the section, wherein the 7 th girder section is closed and leveled by taking the first crane as a reference, then measuring the elevation and the coordinate, and adjusting the position of the girder section according to the measurement result; after positioning, stacking plates are adopted with the face bottom web plate of the head-hung box girder;
6) sequentially hoisting the 6 th box girder, the 5 th box girder, the 4 th box girder, the 3 rd box girder, the 2 nd box girder and the 1 st box girder of the section until the section is completely installed;
7) the second section of box girder reference block hoisting is the same as the step, and temporary limiting channel steel is erected on the distribution beam on the side surface of the box girder; during hoisting, the beam section slowly descends along the channel steel until the beam section falls on the buttress, and the port is matched with the previous section to ensure that the elevation and the sideline of the top and bottom plate are level;
s11, improving the technology;
1) the beam bottom base plate is formed by adding a lower vertical plate or an arc plate to the original traditional plane base plate, so that the thickness of the base plate is accurate and the base plate is completely stressed;
2) simulating inter-segment hoisting by using a BIM technology;
3) combining a network and an informatization technology, a lifting operation command system adopts an interphone, a camera is arranged below a lifting hook, and a display screen is arranged in a cab;
s12, hoisting a steel arch; the steel arch is divided into an A section and an M section in sequence;
1) preparing two truck cranes with the specification of 100 t; two ends of the arch foot A, M segments can be hoisted by a single machine, and the other segments are hoisted by two 100t truck cranes;
2) two truck cranes are adopted to lift the bridge deck, firstly, the top plate of the bridge deck needs to be protected safely, the landing leg area of the crane needs to be accurately positioned, and a road base plate is laid on the top plate. The road base plate is arranged above the partition plate, so that the stress point of the supporting leg of the stressed crane is ensured to be positioned at the partition plate;
3) firstly, hoisting segments at the arch springing part, sequentially hoisting each segment upwards, and finally hoisting closure segments; the steel arch is a special-shaped component, and the beam sections are assembled into inclined socket assembly; the double-crane same-side station is positioned on the bridge floor, the component is lifted from one side of the double-crane, penetrates through the gap and rotates to the opposite side, the component needs to rotate by 90 degrees in the process of transferring, and the double-crane needs to operate simultaneously;
4) hoisting 90 m-span arch rib segments, hoisting 60 m-span arch rib segments, and sequentially hoisting all the segments in sequence until the segments are finally folded;
s13, welding; the welding runs through the hoisting and mounting process of the box girder, and the hoisted box girder is welded according to special welding technological parameters in sequence.
2. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: in step S1, dividing the steel box girder into 25 sections longitudinally, wherein the length of the steel box girder is 12m-17.5m, each section of the main girder is divided into 8 pieces transversely in half, and the total number of the sections is 400; the maximum external dimension of the main beam is 3200mm multiplied by 3302mm multiplied by 17500mm, and the maximum weight of a single piece is 40.44 t;
in step S1, dividing the steel arch rib segments in the length direction, and obtaining a maximum stage transportation length of about 16 m; the maximum external dimensions of the steel rib segments are 2000mm x 2400mm x 169900 mm.
3. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: a crawler crane with the specification of 350t is selected, the length of an effective main arm of the crawler crane is 36m-84m, the width of the center of a crawler is 7.2m, and the length of the crawler is 8.7 m.
4. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: in step S3, the construction channel is used for operation of a beam transporting vehicle and a 350t crawler crane, the construction channel is built on two sides of a bridge, the top elevation is 780.5m, the width is 12m, 500mm thick rubbles are paved and compacted on the upper portion, and the ground pressure ratio reaches 180-200 Kpa.
5. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: in step S4; 16 steel pipe supports are arranged below the butt welding seams of the main beam sections, each 4 steel pipes and the corresponding connecting systems are assembled to form a support hoisting unit in field support assembly, and then 50-ton crawler cranes are used for hoisting.
6. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: in step S4, the distribution beam is a double-spliced 56b I-beam with a total length of 46m and can be hoisted in 3-5 sections.
7. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: in the step S7, the I-steel lengthening butt joint is realized by adopting a welding gusset plate butt joint, and the double-spliced 56b I-steel distribution beam is lifted to the top surface of the steel pipe of the bracket by adopting a crane and accurately arranged at the center of the steel pipe.
8. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: the size of the steel plate in 4) of step S10 is 20mm × 200mm × 200 mm.
9. The construction method for hoisting, installing and constructing the large-span steel bridge box girder and the special-shaped member according to claim 1, wherein the construction method comprises the following steps: in step S10' S5), the yardage size is 16mm x 150mm x 400mm, sets up once every 2m, and a plurality of yardage spot welding connect and form wholly for guarantee beam section safety, prevent this piece of case roof beam displacement because of next piece case roof beam striking leads to.
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| CN113737628A (en) * | 2021-09-29 | 2021-12-03 | 临沂市政集团有限公司 | Double-semi-directional ramp steel box girder for municipal engineering bridge construction and construction process |
| CN114164767A (en) * | 2021-12-27 | 2022-03-11 | 上海市机械施工集团有限公司 | Installation method of steel box girder bridge |
| CN114790687A (en) * | 2022-03-08 | 2022-07-26 | 河北省高速公路延崇管理中心(河北省高速公路京雄管理中心) | Construction method of large-span steel box arch-connected bridge |
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| CN117328369A (en) * | 2023-11-30 | 2024-01-02 | 北京建工集团有限责任公司 | Mounting method of combined box girder |
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