CN112176865A - Construction method for splicing and erecting high-speed railway frame pier steel beam in sections - Google Patents
Construction method for splicing and erecting high-speed railway frame pier steel beam in sections Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 226
- 239000010959 steel Substances 0.000 title claims abstract description 226
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 140
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000009659 non-destructive testing Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 239000006247 magnetic powder Substances 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 2
- 230000032258 transport Effects 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 125000006850 spacer group Chemical group 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention relates to a construction method for splicing and erecting a high-speed rail frame pier steel beam in sections, which comprises the following steps: and S1, dividing the steel beam into three sections for factory processing according to the installation condition of the steel beam to be installed and the parameters of the weight and the size of the steel beam. And S2, transporting the three-section steel beam to a field assembly platform, assembling on the field assembly platform, and welding the joint of the assembled three-section steel beam by adopting a flux-cored wire assembly welding mode to form an integral frame pier steel beam. And S3, erecting the integral frame pier steel beam on the frame pier upright post to form a high-speed rail frame pier beam, and carrying out strip casting construction on the pier beam. Because the sectional steel beam is adopted for processing when a steel processing factory is processed, compared with the prior art, the length of the whole steel beam is shortened, the transportation length of the transportation vehicle is further shortened, and the purpose of convenient transportation is achieved.
Description
Technical Field
The invention relates to the technical field of high-speed rails and motor trains, in particular to a construction method for splicing and erecting a high-speed rail frame pier steel beam in sections.
Background
With the rapid development of high-speed rail engineering in China, the frame pier steel beam has obvious advantages in solving the problem of small-angle crossing of the existing railway.
At present, in the transportation process of a transport vehicle, due to the limitation of a construction site of a high-speed rail, the influence of factors such as narrow roads, limited turning angles of vehicles and the like can exist in the transportation process, so that the phenomena of large turning difficulty and incapability of transportation can exist in the transportation process of a complete steel beam.
Disclosure of Invention
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a construction method for splicing and erecting a steel beam of a high-speed railway frame pier in sections, which solves the technical problem that a complete steel beam cannot be transported and is limited by a transportation road.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the embodiment of the invention provides a construction method for splicing and erecting a high-speed rail frame pier steel beam in sections, which comprises the following steps:
s1, dividing the steel beam into three sections for factory processing according to the installation condition of the steel beam to be installed and the parameters of the weight and the size of the steel beam;
the steel beam required by the high-speed rail frame pier beam is manufactured by dividing into three sections, the steel beam is formed by welding an upper cover plate, a lower cover plate, a first web plate and a second web plate, and the sections of the steel beam are rectangular hollow cylinders;
s2, transporting the three-section steel beam processed in the factory of S1 to a field assembly platform, assembling on the field assembly platform, and welding the joint of the assembled three-section steel beam by adopting a flux-cored wire assembly welding mode to form an integral frame pier steel beam;
the assembling platform is provided with a plurality of clamps at equal intervals for positioning the three-section steel beam during assembling;
and S3, erecting the integral frame pier steel beam formed by welding the S2 on the frame pier upright post, forming a high-speed rail frame pier beam, and carrying out casting strip construction on the pier beam.
Optionally, the factory process of S1 includes:
s11, building an operation platform for factory processing on an open space of 4m multiplied by 25m, and detecting the levelness of the operation platform by means of a level gauge;
and S12, sequentially carrying out sand blasting, lofting, cutting and drilling on the operation platform of S11 by means of a predetermined mould to obtain the structure of an upper cover plate, a lower cover plate, a first web plate and a second web plate which form the steel beam.
S13, assembling the structures of the upper cover plate, the lower cover plate, the first web plate and the second web plate of the S12 steel beam to form the steel beam, specifically, assembling and welding the first web plate ribbed rib and the first web plate, assembling and welding the lower cover plate and the lower cover plate ribbed rib, fixing the positions of the first web plate and the lower cover plate corresponding to each other by spot welding, wherein the welding length of each spot welding is 200-300 mm; correspondingly assembling the second web plates in the same way as the welding way of the first web plates and the lower cover plate, and finally assembling the upper cover plate;
s14, performing secondary assembly and pretreatment on the steel beam of each section assembled in the S13 mode, and dividing the pretreated steel beam into three sections for leaving a factory;
the three-section steel beam is respectively a first steel beam member, a second steel beam member and a third steel beam member, and the first steel beam member is positioned between the second steel beam member and the third steel beam member.
Optionally, S2 includes:
s21, detecting whether each section of steel beam component to be used on site meets the assembly condition, and assembling according to the linear space coordinate of the bridge by using an I120I-steel building base jig as an assembly platform and detecting whether the assembly condition is met;
the first steel cross member is arranged between the second steel cross member and the third steel cross member, and main welding seams are formed between two ends of the first steel cross member and the second steel cross member and between two ends of the first steel cross member and the third steel cross member respectively;
and S22, welding the spliced first steel beam member, the spliced second steel beam member and the spliced third steel beam member by adopting a flux-cored wire assembling and welding mode.
Optionally, S22 includes:
s22-1, welding a lower cover plate;
specifically, a method combining back welding and intermittent welding is adopted to respectively weld one ends of a plurality of first stiffening ribs from two ends of a lower cover plate in a first steel beam member, and the other ends of the first stiffening ribs are respectively welded on a second steel beam member and the lower cover plate in a third steel beam member;
s22-2, welding a main welding seam;
specifically, welding main welding seams of a first steel cross beam member, a second steel cross beam member and a third steel cross beam member by adopting a method of welding an inner groove and an outer back gouging;
s22-3, welding of webs: and welding the first web plate and the second web plate close to the main welding line and the welding stiffening ribs from the outer side of the first steel cross beam member, and finally welding by using the partition plate in the hollow column.
Optionally, in S22-2, the main welds between the first and second steel beam members and the lower and upper decks of the third steel beam member are single-groove welds.
Optionally, in S22-2, the primary welds between the first and second steel beam members and the first and second webs of the third steel beam member are double groove welds.
Optionally, the parameters of the traditional Chinese medicine cored wire assembly welding mode in S22 are as follows:
welding positions: standing position, welding current of 140-180A, voltage of 24-28V, CO2The flow rate is 15-25L/min.
Optionally, S22 further includes:
s22-4, carrying out nondestructive testing on the welding seam;
specifically, in the processing process of the integral frame pier steel beam, the quality of a welding seam is checked and tested according to the requirements of the integral frame pier steel beam before and after assembly, during welding and after welding, so as to ensure that the material and the processing quality meet the manufacturing technical requirements;
the quality requirement of the butt weld is as follows: longitudinal and transverse butt joint: i level; fillet weld: II grade;
the method for detecting the flaw of the welding seam in a nondestructive mode comprises the following steps: ultrasonic waves, X-rays, and magnetic powder.
Optionally, S3 includes:
erecting the welded integral frame pier steel beam by adopting a crawler crane and forming a high-speed rail frame pier beam;
the crawler crane parameters were 400T crawler crane, working radius 14m, using 49m main arm, using 300T hook head.
(III) advantageous effects
The invention has the beneficial effects that: according to the construction method for splicing and erecting the high-speed rail frame pier steel beam in the sections, the steel beam is processed in the section steel beam mode when a steel processing factory is processed, so that compared with the prior art, the length of the whole steel beam is shortened, the transportation length of a transportation vehicle is further shortened, and the purpose of facilitating transportation is achieved. And when the steel beam is transported to a construction site, the sectional steel beam is welded and spliced through the flux-cored wire, so that the welding quality and the welding effect of the construction site are ensured.
Drawings
FIG. 1 is a process flow diagram of the construction method for splicing and erecting the high-speed railway frame pier steel beam in sections;
FIG. 2 is a schematic structural diagram of a frame pier steel beam in the construction method for splicing, erecting and constructing the high-speed rail frame pier steel beam in sections;
FIG. 3 is a factory exploded view of a high-speed rail frame pier steel beam of the present invention;
FIG. 4 is a schematic cross-sectional view of the weld joint of the upper cover plate of the steel beam of the high-speed rail frame pier at the position of the high-speed rail frame pier;
FIG. 5 is a schematic radial cross-sectional view of a high-speed rail frame pier steel beam of the present invention at a first web weld;
fig. 6 is a schematic diagram of the overall construction of the steel beam of the high-speed rail frame pier steel beam frame of the invention.
[ description of reference ]
100: a first steel cross member;
200: a second steel cross member;
300: a third steel cross member;
400: an upper cover plate;
500: a lower cover plate;
600: a first web;
700: a second web;
800: frame pier column.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. Where directional terms such as "upper", "lower", "front" and "rear" are used herein, reference is made to the orientation of FIG. 2.
The high-speed railway frame pier steel beam segmental splicing erection construction method provided by the embodiment of the invention comprises the following steps:
s1, dividing the steel beam into three sections for factory processing according to the installation condition of the steel beam to be installed and the parameters of the weight and the size of the steel beam;
the steel beam required by the high-speed rail frame pier beam is manufactured by dividing into three sections, the steel beam is formed by welding an upper cover plate 400, a lower cover plate 500, a first web plate 600 and a second web plate 700, and the sections of the steel beam are rectangular hollow cylinders;
s2, transporting the three-section steel beam processed in the factory of S1 to a field assembly platform, assembling on the field assembly platform, and welding the joint of the assembled three-section steel beam by adopting a flux-cored wire assembly welding mode to form an integral frame pier steel beam;
the assembling platform is provided with a plurality of clamps at equal intervals for positioning the three-section steel beam during assembling;
and S3, erecting the integral frame pier steel beam formed by welding the S2 on the frame pier upright post, forming a high-speed rail frame pier beam, and carrying out casting strip construction on the pier beam. Because the sectional steel beam is adopted for processing when a steel processing factory is processed, compared with the prior art, the length of the whole steel beam is shortened, the transportation length of the transportation vehicle is further shortened, and the purpose of convenient transportation is achieved.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1-5, the factory process of S1 includes:
s11, building a factory-made operation platform on the empty space of 4m multiplied by 25m, and detecting the levelness of the operation platform by means of a level gauge. So as to ensure the levelness of the whole platform after the construction is finished.
And S12, setting out and manufacturing the main bridge arch-forming jig frame on the operating platform after the operating platform is built. The material is built by using available materials on site. The structures of the upper cover plate 400, the lower cover plate 500, the first web 600 and the second web 700 constituting the steel beam are obtained by sequentially performing sand blasting, lofting, cutting and drilling on the operation platform of S11 by means of a predetermined jig.
And S13, simultaneously, rechecking the mould, wherein the rechecking process needs to be confirmed by a technician and a quality inspector together. The lower cover 500 may be laid after the confirmation of no error. And after the secondary adjustment and fixation is carried out by utilizing the clamping fixture, the length, the width and the diagonal line are controlled. Assembling the structures of the upper cover plate 400, the lower cover plate 500, the first web plate 600 and the second web plate 700 of the steel beam of S12 to form the steel beam, specifically, assembling and welding the first web plate ribbed rib and the first web plate 600, assembling and welding the lower cover plate 500 and the lower cover plate ribbed rib, fixing the positions of the first web plate 600 corresponding to the lower cover plate by spot welding, wherein the welding length of each spot welding is 300mm in 200 and 300 mm; so that the flatness of the first web 600 and the included angle between the lower cover plate respectively meet the preset conditions, the second web 700 is correspondingly assembled in the same manner as the first web 600 and the lower cover plate 500, and finally the upper cover plate 400 is assembled. Firstly, a stiffening rib is assembled and welded on one side of the first web 600, and the stiffening rib is reserved after being qualified; one side of the lower cover plate 500 is welded with a stiffening rib to ensure that the lower cover plate 500 meets the requirements. Specifically, whether the flatness of the first web 600 and the included angle between the first web and the lower cover plate 500 meet the design requirements and relevant specifications or not are checked, a quality inspector is formed for inspection records, and a next process can be performed after a supervision engineer performs recheck to confirm that the first web is qualified. And secondly, assembling the internal stiffening ribs. Except that the welding has the stiffening rib simultaneously has the baffle in the welding of the steel beam component of every section, and also need ensure the baffle one-to-one when assembling. The relative position of each part is determined in the assembling process, the installation size is ensured, a record is formed, and the next process can be carried out after the record is confirmed by a quality department; assembling the second web 700 on the other side again in the same way as above; finally, the upper cover plate 400 is assembled by the same method, and welding can be performed after the upper cover plate is qualified through self-checking, mutual inspection and special inspection. Which are partially welded to achieve stability of the monolith.
And S14, performing secondary assembly and pretreatment on the steel beam of each section assembled in the S13, and dividing the pretreated steel beam into three sections for delivery.
Wherein the three-segment steel beam is a first steel beam member 100, a second steel beam member 200 and a third steel beam member 300, respectively, and the first steel beam member 100 is located between the second steel beam member 200 and the third steel beam member 300. The purpose of dividing into three sections is that the whole bearing capacity of the steel beam formed after welding and splicing is better than that of two sections under the condition of ensuring the whole length of the steel beam and the length of transportation, and compared with the construction operation of four sections, the operation is simpler and more convenient.
Further, S2 includes:
s21, detecting whether each section of steel beam member to be used on site meets the assembly condition, and assembling according to the linear space coordinate of the bridge by using an I120I-steel building base jig as an assembly platform and detecting whether the assembly condition is met;
wherein the first steel cross member 100 is disposed between the second steel cross member 200 and the third steel cross member 300, and main welds are formed between both ends of the first steel cross member 100 and the second steel cross member 200 and the third steel cross member 300, respectively;
and S22, welding the spliced first steel beam member 100, second steel beam member 200 and third steel beam member 300 by adopting a flux-cored wire assembly welding mode.
S22 includes:
s22-1, welding a lower cover plate 500;
specifically, one end of a plurality of first stiffening ribs are welded from both ends of the lower cover plate 500 in the first steel beam member 100 by a method combining the back welding and the intermittent welding, and the other end of each first stiffening rib is welded to the second steel beam member 200 and the lower cover plate 500 in the third steel beam member 300;
s22-2, welding a main welding seam;
specifically, the main welding seams of the first steel cross member 100, the second steel cross member 200 and the third steel cross member 300 are welded by adopting a method of welding an inner groove and an outer back gouging;
s22-3, welding of webs: the first web 600 and the second web 700 are welded from the outside of the first steel beam member 100 near the main weld and the welding stiffener, and finally welded with the spacer inside the hollow column.
Further, in S22-2, the main welds between the lower and upper covers 500 and 400 of the first and second steel beam members 100 and 200 and the third steel beam member 300 are single-groove welds that open upward. As shown in fig. 4.
In S22-2, the main welds between the first and second steel beam members 100 and 200 and the first and second webs 600 and 700 of the third steel beam member 300 are forward and backward double groove welds. As shown in fig. 5.
Further, the parameters of the traditional Chinese medicine cored wire assembly welding mode in the S22 are as follows:
welding positions: standing position, welding current of 140-180A, voltage of 24-28V, CO2The flow rate is 15-25L/min.
In order to ensure the on-site welding quality, the solid welding wire for the vertical position angle seam welding of the steel beam splicing is replaced by the flux-cored welding wire, and the welding parameters are correspondingly adjusted. 6 welding personnel are randomly selected and divided into two groups for comparison, and the welding seam forming quality is obviously improved and the operation difficulty is reduced compared with the use of a solid welding wire by using the flux-cored welding wire.
Further, S22 further includes:
s22-4, carrying out nondestructive testing on the welding seam;
specifically, in the process of processing the integral frame pier steel beam, the quality of the welding seam is checked and tested according to the requirements of the integral frame pier steel beam before and after assembly, during welding and after welding, so as to ensure that the material and the processing quality meet the manufacturing technical requirements.
The welding wave of the welding line is uniform, the defects of cracks, unfused, slag inclusion, welding beading, undercut, burn-through, craters, needle-shaped air holes and the like are avoided, and no splashing residues exist after welding. If yes, then carrying out repair; if the welding seam has no crack, good fusion degree, no slag inclusion, no weld beading, no undercut, no burn-through, no arc pit, no needle-shaped air hole and other defects, the welding is finished.
The quality requirement of the butt weld is as follows: longitudinal and transverse butt joint: i level; fillet weld: and (II) grade.
The method for detecting the flaw of the welding seam in a nondestructive mode comprises the following steps: ultrasonic waves, X-rays, and magnetic powder.
Further, S3 includes:
erecting the welded integral frame pier steel beam by adopting a crawler crane and forming a high-speed rail frame pier beam;
the crawler crane parameters were 400T crawler crane, working radius 14m, using 49m main arm, using 300T hook head.
Specifically, the length of the whole steel beam is determined to be 27.1m according to actual conditions on site, weight and size. The upper cover plate 400, the first web 600, the lower cover plate 500 and the second web 700 are sequentially connected end to form a hollow cylinder through a mould, so that required steel beams are formed by welding, and the required steel beams are respectively subjected to factory processing in three sections. The length of the upper deck 400, the length of the first web 600, the length of the second web 700, and the length of the lower deck 500 of the first steel beam member 100 divided into three sections are 8m, 8.6m, and 9.2m, respectively. The upper decks 400 of the second and third steel beam members 200 and 300 each have a length of 9.552m, the first webs 600 each have a length of 8.478m, the second webs 700 each have a length of 8.178m, and the lower decks 500 each have a length of 6.5 m. The third steel cross member 300 and the second steel cross member 200 are bilaterally symmetrical with respect to the first steel cross member. In which the cross-sectional end surfaces of the respective plates of the first steel cross member 100, to which the second steel cross member 200 and the third steel cross member 300 are welded, are not on the same horizontal plane, as shown in fig. 3, in order to ensure stability of the weld during welding. The welding seam quality of the designed welding is guaranteed, and meanwhile, a steel plate with the thickness of 20mm and a channel steel No. 10 are additionally adopted to locally reinforce the welding position.
Preferably, the segmented steel cross beam is placed in front of the transport vehicle, and a transverse pull rope is laid on the transport vehicle. Each section of steel beam is convenient to carry.
Preferably, the transport vehicle transports a maximum length of 10.052m and a maximum weight of 52 t.
And (4) welding seam quality requirements are as follows: longitudinal and transverse butt joint: i, grade; fillet weld: and II, level II.
Wherein the primary weld is a butt weld. 100% penetration and 100% non-destructive testing are required. Due to the influence of factors such as field conditions, a manufacturability test evaluation report meeting field requirements is compiled before the steel beam is assembled and welded on the spot, and the manufacturability test evaluation report is strictly executed in the welding process.
And the butt welding seam adopts a flux-cored wire and is welded according to the welding parameter standard determined by the process test. And dynamically monitoring the humidity of the welding site to ensure that welding cannot be performed in rainy days and with the humidity of more than 80 percent. And preheating by adopting a flame heating method before welding, wherein the preheating temperature is 30-80 ℃, the preheating width is within the range of 3 times of the thickness of the steel plate on two sides of the welding line respectively, and the preheating width is not less than 100 mm. Welding materials such as welding rods, a melting nozzle, welding flux, flux-cored wires and the like can be used after being dried, the welding materials are taken out of the heat preservation box for more than 4 hours and are required to be dried again, and the welding materials are required to be placed into a heat preservation barrel for storage when being used on site.
And selecting a 400T crawler crane for construction according to the weight of the steel beam of the most-heavy integral frame of about 144T. Working radius 14m, using 49m main arm, using 300T hook. When the heaviest steel cross beam is installed, the super-lift counterweight is used, the 130T working radius and the 14-meter working radius are used, and the maximum lifting capacity reaches 183 tons. The weight of the whole frame steel beam is about 144T, the weight of the hook head is about 5.5T, the weight of the steel wire rope is about 2.3T, and the total weight is 151.8T. The safety factor is that the maximum lifting capacity/integral hoisting weight is approximately equal to 1.205, and the hoisting condition is met.
The crane site area must be surface-filled and tamped prior to the crawler crane operation. The ground endurance must meet the crane service performance requirement through inspection, and the crane can be lifted.
And after the frame steel beam is installed, constructing the reinforcing steel bars, the templates and the concrete of the pier beam post-cast strip, wherein the post-cast strip construction is carried out by utilizing a railway BC plan.
In order to reduce the influence of the construction of the supporting cushion stone on the safety of a business line, the supporting cushion stone on the top of the integral framework steel beam is hung on the ground before the integral framework steel beam is erected.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" 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 specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (9)
1. A construction method for splicing and erecting high-speed rail frame pier steel beams in sections is characterized by comprising the following steps:
s1, dividing the steel beam into three sections for factory processing according to the installation condition of the steel beam to be installed and the parameters of the weight and the size of the steel beam;
the steel beam required by the high-speed rail frame pier beam is manufactured by dividing into three sections, the steel beam is formed by welding an upper cover plate (400), a lower cover plate (500), a first web plate (600) and a second web plate (700), and the sections of the steel beam are rectangular hollow cylinders;
s2, transporting the three-section steel beam subjected to the factory-made treatment of S1 to a field assembly platform, assembling the three-section steel beam on the field assembly platform, and welding the joint of the assembled three-section steel beam by adopting a flux-cored wire assembly welding mode to form an integral frame pier steel beam;
the assembling platform is provided with a plurality of clamps at equal intervals for positioning the three-section steel beam during assembling;
and S3, erecting the integral frame pier steel beam formed by welding the S2 on the frame pier upright post, forming a high-speed rail frame pier beam, and carrying out casting strip construction on the pier beam.
2. The construction method for segmental splicing erection of the pier steel beam of the high-speed railway frame according to claim 1, wherein the factory-made process of S1 comprises the following steps:
s11, building an operation platform for factory processing on an open space of 4m multiplied by 25m, and detecting the levelness of the operation platform by means of a level gauge;
s12, sequentially carrying out sand blasting, lofting, cutting and drilling on the operation platform of the S11 by means of a predetermined mould to obtain structures of an upper cover plate, a lower cover plate, a first web plate and a second web plate which form the steel beam;
s13, assembling the structures of the upper cover plate (400), the lower cover plate (500), the first web plate (600) and the second web plate (700) of the S12 steel beam to form the steel beam, specifically, assembling and welding the first web plate rib and the first web plate (600), assembling and welding the lower cover plate (500) and the lower cover plate rib, fixing the positions of the first web plate (600) and the lower cover plate (500) corresponding to each other by spot welding, wherein the welding length of each spot welding is 300 mm; correspondingly assembling the second web plate (700) so that the included angles between the flatness of the first web plate (600) and the lower cover plate (500) respectively meet preset conditions, wherein the method is the same as the welding method of the first web plate (600) and the lower cover plate (500), and finally assembling the upper cover plate (400);
s14, performing secondary assembly and pretreatment on the steel beam of each section assembled in the S13 mode, and dividing the pretreated steel beam into three sections for delivery;
the three-section steel beam is respectively a first steel beam member (100), a second steel beam member (200) and a third steel beam member (300), and the first steel beam member (100) is located between the second steel beam member (200) and the third steel beam member (300).
3. The construction method for segmental splicing erection of the pier steel beam of the high-speed railway frame according to claim 1, wherein the S2 comprises the following steps:
s21, detecting whether each section of steel beam member to be used on site meets the assembly condition, and assembling according to the linear space coordinate of the bridge by using an I120I-steel building base jig as an assembly platform and detecting whether the assembly condition is met;
wherein the first steel beam member (100) is disposed between the second steel beam member (200) and the third steel beam member (300), and main welds are formed between both ends of the first steel beam member (100) and the second steel beam member (200) and the third steel beam member (300), respectively;
and S22, welding the spliced first steel beam member (100), second steel beam member (200) and third steel beam member (300) by adopting a flux-cored wire assembly welding mode.
4. The construction method for segmental splicing erection of the pier steel beam of the high-speed railway frame according to claim 3, wherein the S22 comprises the following steps:
s22-1, welding a lower cover plate (500);
specifically, one ends of a plurality of first stiffening ribs are welded from two ends of a lower cover plate (500) in the first steel beam member (100) respectively by adopting a method of combining back welding and intermittent welding, and the other ends of the first stiffening ribs are welded on the second steel beam member (200) and the lower cover plate (500) in the third steel beam member (300) respectively;
s22-2, welding a main welding seam;
specifically, welding main welding seams of the first steel cross member (100), the second steel cross member (200) and the third steel cross member (300) by adopting an internal groove welding external back gouging method;
s22-3, welding of webs: and welding the first web (600) and the second web (700) close to a main welding seam and welding stiffening ribs from the outer side of the first steel beam member (100), and finally welding with a partition plate in the hollow column.
5. The construction method for segmental splicing erection of pier steel beams of a high-speed railway frame according to claim 4, wherein in the S22-2, main welding seams between the lower cover plate (500) and the upper cover plate (400) of the first steel beam member (100) and the second steel beam member (200) and the third steel beam member (300) are single-groove welding seams.
6. The construction method for segmental splicing erection of pier steel beams of a high-speed railway frame according to claim 4, wherein in the S22-2, main welding seams between the first steel beam member (100) and the second steel beam member (200) and the first web (600) and the second web (700) of the third steel beam member (300) are double-groove welding seams.
7. The high-speed rail frame pier steel beam segmental splicing erection construction method according to claim 3, wherein parameters of the S22 traditional Chinese medicine cored wire splicing welding mode are as follows:
welding positions: standing position, welding current of 140-180A, voltage of 24-28V, CO2The flow rate is 15-25L/min.
8. The construction method for segmental splicing and erecting of the pier steel beam of the high-speed railway frame according to claim 4, wherein the S22 further comprises the following steps:
s22-4, carrying out nondestructive testing on the welding seam;
specifically, in the processing process of the integral frame pier steel beam, the quality of a welding seam is checked and tested according to the requirements of the integral frame pier steel beam before and after assembly, during welding and after welding, so as to ensure that the material and the processing quality meet the manufacturing technical requirements;
the quality requirement of the butt weld is as follows: longitudinal and transverse butt joint: i level; fillet weld: II grade;
the method for detecting the flaw of the welding seam in a nondestructive mode comprises the following steps: ultrasonic waves, X-rays, and magnetic powder.
9. The construction method for segmental splicing and erecting of the high-speed railway frame pier steel beam according to claim 4, wherein the S3 comprises the following steps:
erecting the welded integral frame pier steel beam by adopting a crawler crane and forming a high-speed rail frame pier beam;
the crawler crane parameters were 400T crawler crane, working radius 14m, using 49m main arm, using 300T hook head.
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