CN111287067A - Manufacturing method for curved part of steel box arch unit - Google Patents
Manufacturing method for curved part of steel box arch unit Download PDFInfo
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- CN111287067A CN111287067A CN202010078766.7A CN202010078766A CN111287067A CN 111287067 A CN111287067 A CN 111287067A CN 202010078766 A CN202010078766 A CN 202010078766A CN 111287067 A CN111287067 A CN 111287067A
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- E01D4/00—Arch-type bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention provides a manufacturing method for curved bending of a steel box arch unit piece, which comprises the following steps: dividing the pre-assembled arch rib into a plurality of box arch unit pieces, wherein each box arch unit piece comprises an outer web unit, a diaphragm plate unit, an inner web unit, a bottom plate unit and a top plate unit; blanking a steel plate to obtain an outer web unit, wherein the arch top and the arch bottom of the outer web unit are provided with curve radians matched with the linear curves of the pre-assembled arch ribs; blanking a steel plate to obtain an inner web plate unit, wherein the arch top and the arch bottom of the inner web plate unit are provided with curve radians matched with the linear curves of the pre-assembled arch ribs; blanking a steel plate to obtain a diaphragm plate unit; blanking a steel plate to obtain a rectangular bottom plate unit; blanking a steel plate to obtain a rectangular top plate unit; and assembling and pre-assembling a plurality of box arch unit pieces on the pre-assembling jig frame. The method can make the arch rib line type smoother and smoother so as to better embody the aesthetic property of the arch bridge.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a manufacturing method for curved bending of a steel box arch unit piece.
Background
For example, the chinese patent application CN105421211A discloses a method for manufacturing a long-span single-arch steel box arch, which uses a broken line segment fitting arch axis to manufacture a long-span single-arch steel box arch, and does not need to make an arc when a web plate is blanked. Although the method achieves the manufacturing effect of the curved steel box arch on the whole, for the urban landscape bridge, the mode of fitting the arch axis by the broken line segments causes that the line type of the arch rib is not smooth and smooth enough, and especially when the steel box arch has a certain inclination angle, the traditional processing method of 'directly replacing curved' cannot meet the requirement. Therefore, the invention provides a horizontal assembling, processing and manufacturing method for curved and curved manufacture of an inclined steel box arch, and the steel box arch manufactured by curved and curved manufacture better embodies the aesthetic property of an arch bridge.
In addition, the chinese invention application CN105421211A discloses a method for manufacturing a large-span single-arch-rib steel box arch, which is to assemble an upper steel box girder arch segment, a middle steel box girder arch segment, a left steel box girder arch segment and a right steel box girder arch segment on a main girder jig, then assemble the upper steel box girder arch segment, the middle steel box girder arch segment, the left steel box girder arch segment and the right steel box girder arch segment into a steel box arch segment, and finally assemble a plurality of steel box arch segments into the large-span single-arch-rib steel box arch in sequence, which has the following disadvantages: (1) the assembly in the patent application is divided into three stages, namely an upper steel box girder arch segment, a middle steel box girder arch segment, a left steel box girder arch segment and a right steel box girder arch segment, a steel box arch segment and a long-span single-arch rib steel box arch, wherein in the process of the three assembly stages, a factory needs to manufacture and manufacture a jig frame aiming at each segment, and also needs to manufacture a pre-assembled jig frame for pre-assembly, the whole manufacturing process needs more jig frames, and the jig frame is wasted; (2) in the pre-assembly process, the upper steel box girder arch subsection, the middle steel box girder arch subsection and the left steel box girder arch subsection need to be transferred among different moulding beds, so that labor waste is caused, and the hoisting difficulty is increased and the requirement on the site is high due to the fact that the weight of each subsection is large; (3) the upper steel box girder arch subsection, the middle steel box girder arch subsection, the left steel box girder arch subsection and the right steel box girder arch subsection are manufactured firstly, and then the subsections are assembled into the steel box arch subsection, so that the linearity and the precision of the steel box arch subsection are difficult to control accurately, and the manufacturing precision of each subsection has high requirements.
Disclosure of Invention
In view of the above problems, there is a need for a method for manufacturing a curved arch of a steel box, which can make the arch rib line more smooth and smooth, so as to better embody the aesthetic property of an arch bridge.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a manufacturing method for curved bending of a steel box arch unit element comprises the following steps:
dividing a box arch unit piece: dividing the pre-assembled arch rib into a plurality of box arch unit pieces, wherein each box arch unit piece comprises an outer web unit, a diaphragm plate unit, an inner web unit, a bottom plate unit and a top plate unit;
manufacturing an outer web unit: according to the pre-assembled arch rib linear curve, steel plate blanking is carried out according to the computer lofting size to obtain an outer web unit, and the arch crown of the outer web unit have curve radians matched with the pre-assembled arch rib linear curve;
manufacturing an inner web plate unit: according to the linear curve of the pre-assembled arch rib, blanking a steel plate according to the lofting size of a computer to obtain an inner web plate unit, wherein the arch crown and the arch crown of the inner web plate unit have curve radians matched with the linear curve of the pre-assembled arch rib;
manufacturing a diaphragm plate unit: blanking a steel plate according to the lofting size of a computer to obtain a diaphragm plate unit;
manufacturing a bottom plate unit: blanking a steel plate according to the lofting size of a computer to obtain a rectangular bottom plate unit;
manufacturing a top plate unit: blanking a steel plate according to the lofting size of a computer to obtain a rectangular top plate unit;
pre-splicing: and assembling and pre-assembling a plurality of box arch unit pieces on the pre-assembling jig frame.
Further, in the pre-assembling step, each N box arch unit pieces are pre-assembled as one arch rib section for one round, the front N-1 box arch unit pieces of the arch rib section are hung after the size of each arch rib section is adjusted, and the rest box arch unit pieces are pre-assembled as a standard section and then pre-assembled with the rear N-1 box arch unit pieces as a next round, which specifically comprises the following steps:
s21: surveying and marking control point landmarks of each arch rib segment to be spliced in a pre-splicing field according to the linear curve of the arch rib to be spliced in the wheel, setting out each control point by a computer, and manufacturing a pre-splicing jig frame according to each control point;
s22: sequentially positioning the inner web units of N box arch unit elements in the pre-assembly of the wheel on a pre-assembly jig frame, and temporarily fixing the inner web units of two adjacent box arch unit elements through a horse board;
s23: temporarily fixing diaphragm plate units on the inner web plate units of the N box arch unit pieces respectively;
s24: respectively positioning the top plate units of the N box arch unit elements on a pre-assembly jig frame, sequentially applying force to each top plate unit by using a jack to enable the top plate units to be tightly propped against the diaphragm plate units of the corresponding box arch unit elements so as to enable the top plate units to deform into curved plates consistent with the curve radians at the arch tops of the corresponding inner web plate units, welding the top plate units with the diaphragm plate units and the inner web plate units of the corresponding box arch unit elements, and temporarily fixing the top plate units of the two adjacent box arch unit elements through horse plates; respectively positioning the bottom plate units of the N box arch unit elements on a pre-assembly jig frame, sequentially applying force to each bottom plate unit by using a jack to enable the bottom plate units to be tightly propped against the diaphragm plate units of the corresponding box arch unit elements so as to enable the bottom plate units to deform into curved plates consistent with the curve radians at the arch bottoms of the corresponding inner web plate units, welding the bottom plate units with the diaphragm plate units and the inner web plate units of the corresponding box arch unit elements, and temporarily fixing the bottom plate units of the two adjacent box arch unit elements through horse plates;
s25: the outer web unit pieces of N box arch unit pieces are sequentially positioned on a pre-assembly jig frame, the outer web unit pieces of two adjacent box arch unit pieces are temporarily fixed through horse plates, and box inner welding seams of the box arch unit pieces are welded, so that an inner web unit, an outer web unit, a top plate unit, a bottom plate unit and a diaphragm plate unit of each box arch unit piece are connected together to form the box arch unit pieces;
s26: and (4) removing the first N-1 box arch unit pieces pre-spliced in the current round, reserving the last box arch unit piece as a pre-splicing reference segment of the next round, and repeating the steps S22 to S26 until the pre-splicing of all the steel box arch unit pieces is completed.
Further, N is an integer not less than 5, and the maximum dimension of the pre-assembly jig frame is 12.45m by 35 m.
Furthermore, outer web unit and interior web unit all include the web and be fixed in on web one side and a plurality of webs vertical rib that parallel interval set up, the vault and the hunch bottom department of web have with the arch rib linear curve assorted curve radian of assembling in advance, the vault department and the hunch bottom department interval setting of web vertical rib and web.
Further, the manufacturing steps of the outer web plate unit and the inner web plate unit specifically include: blanking a steel plate according to the computer lofting size to obtain the web; marking a web plate arch rib linear curve, a web plate longitudinal rib datum line and a diaphragm plate unit datum line on a processing platform; grooving along the linear curve of the web arch rib by using a semi-automatic cutting machine; and welding the web longitudinal ribs on the web according to the web longitudinal rib reference line to obtain the outer web unit and the inner web unit.
Further, the top plate unit comprises a top plate and a plurality of top plate longitudinal ribs which are fixed on one side of the top plate and arranged in parallel at intervals, the top plate is a rectangular plate, the bottom plate unit comprises a bottom plate and a plurality of bottom plate longitudinal ribs which are fixed on one side of the bottom plate and arranged in parallel at intervals, and the bottom plate is a rectangular plate.
Further, the manufacturing steps of the top plate unit specifically include: blanking a steel plate according to the computer lofting size to obtain the top plate; marking a top plate contour line and a top plate longitudinal rib datum line on a machining platform; performing flame precision cutting and grooving along the contour line of the top plate by using a semi-automatic cutting machine; and splicing and welding the top plate longitudinal ribs on the top plate according to the top plate longitudinal rib reference lines to form top plate units.
Further, the manufacturing steps of the bottom plate unit specifically include: blanking a steel plate according to the computer lofting size to obtain the bottom plate; marking a bottom plate contour line and a bottom plate longitudinal rib datum line on a processing platform; performing flame precision cutting and grooving along the contour line of the bottom plate by using a semi-automatic cutting machine; and splicing and welding the longitudinal ribs of the bottom plate on the bottom plate according to the reference lines of the longitudinal ribs of the bottom plate to form a bottom plate unit.
Furthermore, when in pre-assembly, a plurality of box arch unit pieces are symmetrically pre-assembled from arch feet to arches.
Furthermore, the butt joint of the top plate unit, the butt joint of the bottom plate unit, the butt joint of the inner web unit and the butt joint of the outer web unit in two adjacent box arch unit pieces are arranged in a staggered mode.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the invention provides a manufacturing method for curved curve of a steel box arch, which is characterized in that curves matched with pre-assembled arch rib linear curves are formed at the arch tops and arch bottoms of inner and outer web units during blanking, so that the manufactured steel box arch unit pieces are consistent with the arch bridge in line type.
2. According to the manufacturing method for the steel box arch curve bending, the assembly of the single box arch unit piece and the pre-assembly among the plurality of box arch unit pieces are carried out simultaneously, the number of the required moulding beds in the assembly process can be reduced, and the cost is reduced.
3. According to the manufacturing method for the steel box arch curved part, only one jig frame is needed in the assembling process, so that materials do not need to be transferred among different jig frames, manpower is saved, and the production efficiency is improved.
4. According to the manufacturing method for the steel box arch curved part, when the box arch unit is pre-assembled, the outer web plate unit, the transverse partition plate unit, the inner web plate unit, the bottom plate unit and the top plate unit of the box arch unit are positioned on the jig, and compared with a mode of positioning the whole box arch unit on the jig in the prior art, each unit forming the box arch unit is sequentially lifted on the jig by the method, the lifting difficulty is reduced, and the requirement on a site is low.
5. The manufacturing method of the steel box arch curve curved part adopts a mode of manufacturing a plurality of steel box arch unit pieces together during pre-assembly, namely, pre-assembling inner web units of the plurality of box arch unit pieces, pre-assembling top and bottom plate units of the plurality of box arch unit pieces, and finally pre-assembling outer web units of the plurality of box arch unit pieces.
Drawings
FIG. 1 is a schematic perspective view of a box arch unit according to a preferred embodiment of the present invention.
FIG. 2 is a schematic structural diagram of the pre-assembly of the box arch unit according to the preferred embodiment of the invention.
Fig. 3 is a schematic structural view of the inner web unit positioned on the pre-assembly jig frame in the preferred embodiment of the invention.
Fig. 4 is a schematic structural view of the diaphragm unit mounted on the web unit shown in fig. 3.
Fig. 5 is a schematic structural view of the structure shown in fig. 4 after the top plate unit and the bottom plate unit are mounted thereon.
Fig. 6 is a schematic view of the structure of fig. 5 after the installation of an outer web unit thereon.
Fig. 7 is a view of fig. 5 from another perspective.
Fig. 8 is a top view of fig. 2.
Description of the main elements
100. A case arch unit; 2. an outer web unit; 21. a web; 23. a web longitudinal rib; 4. a diaphragm unit; 41. a partition plate; 43. a bulkhead stiffener; 45. a socket; 6. an inner web unit; 8. a floor unit; 81. a base plate; 83. a bottom plate longitudinal rib; 9. a top plate unit; 91. a top plate; 93. a top plate longitudinal rib; 10. pre-assembling the moulding bed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 8, a preferred embodiment of the present invention provides a method for manufacturing a curved steel box arch unit, including the following steps:
s1, dividing the box arch unit piece 100: the preassembled arch rib is divided into a plurality of box arch unit pieces 100, and each box arch unit piece 100 comprises an outer web unit 2, a diaphragm unit 4, an inner web unit 6, a bottom plate unit 8 and a top plate unit 9.
S2, production of outer web element 2: according to the linear curve of the pre-assembled arch rib, steel plate blanking is carried out according to the computer lofting size to obtain the outer web unit 2, and the arch crown of the outer web unit 2 have curve radians matched with the linear curve of the pre-assembled arch rib, as shown in fig. 8.
In the present embodiment, the outer web unit 2 includes a web 21 and a plurality of longitudinal web ribs 23 fixed on one side of the web 21 and arranged in parallel at intervals, the arch crown and arch bottom of the web 21 have curve radians matched with the linear curves of the pre-assembled arch ribs, and the longitudinal web ribs 23 are arranged at intervals with the arch crown and arch bottom of the web 21 for subsequent processing. The manufacturing steps of the outer web element 2 specifically include:
s21, blanking a steel plate according to the computer lofting size to obtain the web plate 21;
s22, marking a web arch rib linear curve, a web longitudinal rib datum line and a diaphragm plate unit datum line on the processing platform of the web 21;
s23, grooving along the web arch rib linear curve by using a semi-automatic cutting machine;
and S24, welding the web longitudinal ribs 23 on the web 21 according to the web longitudinal rib reference line to obtain the outer web unit 2.
Preferably, a certain process margin is reserved during cutting and blanking according to the working procedure requirements of welding, processing, correcting and the like; in step S24, after welding, the butt weld reinforcement is ground by a grinding machine, and the welding deformation caused by welding the butt weld is corrected.
S3, making the inner web element 6: according to the linear curve of the pre-assembled arch rib, steel plate blanking is carried out according to the computer lofting size to obtain an inner web plate unit 6, and the arch top and the arch bottom of the inner web plate unit 6 are provided with curve radians matched with the linear curve of the pre-assembled arch rib.
The structure of the inner web plate unit 6 is the same as that of the outer web plate unit 2, and the inner web plate unit comprises a web plate 21 and a plurality of web plate longitudinal ribs 23 which are fixed on one side of the web plate 21 and arranged in parallel at intervals, and the web plate longitudinal ribs 23 and the vault bottom of the web plate 21 are arranged at intervals so as to facilitate subsequent processing. The manufacturing method of the inner web plate unit 6 specifically comprises the following steps:
s31, blanking a steel plate according to the computer lofting size to obtain the web plate 21;
s32, marking a web arch rib linear curve, a web longitudinal rib datum line and a diaphragm plate unit datum line on the processing platform of the web 21;
s33, grooving along the web arch rib linear curve by using a semi-automatic cutting machine;
and S34, welding the web longitudinal ribs 23 on the web 21 according to the web longitudinal rib reference line to obtain the inner web plate unit 6.
Preferably, a certain process margin is reserved during cutting and blanking according to the working procedure requirements of welding, processing, correcting and the like; in step S34, after the welding is completed, the butt weld reinforcement is ground by a grinding machine, and the welding deformation caused by welding the butt weld is corrected.
S4, production of diaphragm unit 4: and blanking the steel plate according to the computer lofting size to obtain the diaphragm plate unit 4.
In this embodiment, the diaphragm plate unit 4 includes a diaphragm plate 41 and a diaphragm plate stiffening rib 43 fixed on the diaphragm plate 41, a plurality of sockets 45 are arranged at intervals on the periphery of the diaphragm plate 41, and the manufacturing steps of the diaphragm plate unit 4 specifically include: blanking a steel plate according to the lofting size of a computer to obtain a partition plate 41, and performing flame precision cutting on the partition plate 41 on a numerical control cutting machine to form a plurality of sockets 45; the diaphragm plate unit 4 is formed by welding the diaphragm stiffeners 43 to the diaphragm plates 41.
Preferably, a certain process margin is reserved during cutting and blanking according to the working procedure requirements of welding, processing, correcting and the like; and arc positions at four corners of the partition plate 41 are polished after blanking. After the separator 41 and the separator stiffening rib 43 are welded, the welding deformation formed by welding should be trimmed, and the trimming method of the welding deformation belongs to the prior art and is not repeated herein for brevity.
S5, production of floor element 8: and (4) blanking steel plates according to the computer lofting size to obtain the rectangular bottom plate unit 8.
In the present embodiment, the bottom plate unit 8 includes a bottom plate 81 and a plurality of bottom plate longitudinal ribs 83 fixed on one side of the bottom plate 81 and arranged in parallel at intervals, and the bottom plate 81 is a rectangular plate. The manufacturing steps of the bottom plate unit 8 specifically include: blanking a steel plate according to the computer lofting size to obtain the bottom plate 81; marking a bottom plate contour line and a bottom plate longitudinal rib datum line on the processing platform by the bottom plate 81; performing flame precision cutting and grooving along the contour line of the bottom plate by using a semi-automatic cutting machine; the floor unit 8 is formed by welding the floor longitudinal ribs 83 to the floor 81 on the floor longitudinal rib reference line.
Preferably, certain process allowance is reserved during cutting and blanking according to the process requirements of welding, processing, correcting and the like. And after the tailor-welding is finished, polishing the surplus height of the butt welding seam by using a polishing machine, and correcting welding deformation caused by welding the butt welding seam.
S6, preparation of top plate element 9: and blanking steel plates according to the computer lofting size to obtain a rectangular top plate unit 9.
In the present embodiment, the top plate unit 9 includes a top plate 91 and a plurality of top plate longitudinal ribs 93 fixed to one side of the top plate 91 and arranged in parallel at intervals, and the top plate 91 is a rectangular plate. The manufacturing steps of the top plate unit 9 specifically include: blanking a steel plate according to the computer lofting size to obtain the top plate 91; marking a top plate contour line and a top plate longitudinal rib reference line on the machining platform by the top plate 91; performing flame precision cutting and grooving along the contour line of the top plate by using a semi-automatic cutting machine; the top plate longitudinal ribs 93 are tailor welded to the top plate 91 according to the top plate longitudinal rib reference line to form the top plate unit 9.
Preferably, certain process allowance is reserved during cutting and blanking according to the process requirements of welding, processing, correcting and the like. And after the tailor-welding is finished, polishing the surplus height of the butt welding seam by using a polishing machine, and correcting welding deformation caused by welding the butt welding seam.
S7, pre-splicing: assembling and pre-assembling a plurality of box arch unit pieces 100 on a pre-assembling jig, performing one-round pre-assembling on every N box arch unit pieces 100 as one arch rib section, hoisting N-1 box arch unit pieces 100 in front of the arch rib section after the size of each arch rib section is adjusted, and pre-assembling the rest box arch unit pieces 100 as a standard section and then the last N-1 box arch unit pieces 100 as a next round with the pre-assembling jig specifically comprising the following steps:
s71: and surveying and marking control point landmarks of each arch rib segment to be spliced in a pre-splicing field according to the linear curve of the arch rib to be spliced in the wheel, setting out each control point by a computer, and manufacturing the pre-splicing jig frame 10 according to each control point.
In the present embodiment, control point landmarks of each segment to be spliced are mapped out in the pre-splicing site by using tools such as a level, a laser theodolite and the like, and the control points include control points such as intersection points of a segment port line and an outer contour, and intersection points of an arch center line and a segment port line. The maximum dimension of the pre-assembled jig 10 is 12.45m 35 m. The pre-assembled jig 10 is made in the prior art and will not be described herein for brevity.
S72: sequentially positioning the inner web units 6 of the N box arch unit elements 100 in the pre-assembly of the wheel on the pre-assembly jig frame 10, and temporarily fixing the inner web units 6 of the two adjacent box arch unit elements 100 through horse boards. The temporary fixing of the two elements by means of a horse board is a common technical measure in the field and will not be described herein for the sake of brevity.
S73: the diaphragm plate units 4 are temporarily fixed on the inner web units 6 of the N tank arch unit pieces 100, respectively.
When the diaphragm plate unit 4 is assembled, the diaphragm plate unit 4 is temporarily fixed to the web plate 21 of the inner web plate unit 6 with reference to the diaphragm plate unit reference line, and the diaphragm plate 41 is inserted into the web plate longitudinal ribs 23 on the web plate 21 through the plurality of insertion holes 45. When the diaphragm plate unit 4 is assembled, the diaphragm plate 41 is positioned and installed by paying attention to the perpendicularity with the web plate 21 unit due to the large section of the diaphragm plate 41, and angle steel is used for inclined support. The diaphragm unit 4 is generally divided into a general diaphragm and a boom diaphragm, and the installation position thereof is set according to design requirements.
S74: respectively positioning the top plate units 9 of the N box arch unit elements 100 on a pre-assembly jig 10, sequentially applying force to each top plate unit 9 by using a jack to enable the top plate units 9 to be tightly propped against the diaphragm plate units 4 of the corresponding box arch unit elements 100 so as to enable the top plate units 9 to deform into curved plates (shown in figure 8) consistent with the curve radian of the arches of the corresponding inner web units 6, welding the top plate units 9 with the diaphragm plate units 4 and the inner web units 6 of the corresponding box arch unit elements 100, and temporarily fixing the top plate units 9 of the adjacent two box arch unit elements 100 through horse plates; the bottom plate units 8 of N box arch unit elements 100 are respectively positioned on a pre-assembly jig 10, a jack is used for sequentially applying force to each bottom plate unit 8 to enable the bottom plate unit 8 to be tightly propped against the diaphragm plate unit 4 of the corresponding box arch unit element 100, so that the bottom plate unit 8 is deformed into a curved plate (figure 8) which is consistent with the curve radian of the arch bottom of the corresponding inner web plate unit 6, the bottom plate unit 8 is welded with the diaphragm plate unit 4 and the inner web plate unit 6 of the corresponding box arch unit element 100, and the bottom plate units 8 of two adjacent box arch unit elements 100 are temporarily fixed through horse plates.
In this step, the top plate 91 is inserted into the insertion hole 45 around the bulkhead 41 via the top plate longitudinal rib 93, and the floor unit 8 is inserted into the insertion hole 45 around the bulkhead 41 via the floor longitudinal rib 83. Due to the large size of the top plate unit 9 and the bottom plate unit 8, the perpendicularity of the top plate 91, the bottom plate 81 and the web 21 should be noted during installation.
S75: the outer web units 2 of N box arch unit elements 100 are respectively positioned on the pre-assembly jig 10 in sequence, the outer web units 2 of two adjacent box arch unit elements 100 are temporarily fixed through horse plates, and box inner welding seams of the box arch unit elements 100 are welded, so that the inner web unit 6, the outer web unit 2, the top plate unit 9, the bottom plate unit 8 and the transverse diaphragm unit 4 of each box arch unit element 100 are connected together to form the box arch unit element 100.
When welding the in-box welding seams of each box arch unit element 100, the in-box welding seams of the transverse partition plates 41 are welded, and angle penetration welding seams among the outer web plate 21, the top plate unit 9 and the bottom plate unit 8 are welded, wherein the angle penetration welding seams of the web plates 21 of the top plate 91, the bottom plate 81 and the inner web plate unit 6 are subjected to back welding on the inner side, then the box arch unit elements 100 are turned over through two portal cranes, so that the web plates 21 of the outer web plate unit 2 face downwards, and then the angle penetration welding seams among the inner web plate unit 6, the top plate unit 9 and the bottom plate unit 8 are welded. By turning over the case arch unit piece 100, the overhead welding position can be turned into the flat welding position, thereby facilitating the welding operation and ensuring the quality.
S76: and (4) removing the first N-1 box arch unit pieces 100 pre-spliced in the current round, reserving the last box arch unit piece 100 as a pre-splicing reference segment of the next round, and repeating the steps S71 to S76 until the pre-splicing of all the steel box arch unit pieces 100 is completed.
Preferably, N is an integer no less than 5, i.e. each round of pre-tiling comprises at least 5 box arch units, so that the rib segments of each round of pre-tiling have a suitable length to improve the accuracy of the tiling. In the present embodiment, during pre-assembly, a plurality of box arch unit pieces 100 are pre-assembled symmetrically from arch springing to arch crown, preferably, before pre-assembly, serial numbers are marked on the box arch unit pieces 100 according to a pre-assembly sequence, specifically, steel byte segment numbers can be welded on a web plate 21 of the box arch unit pieces 100, so that arch rib segments can be easily distinguished in the storage and hoisting processes; and pre-assembling 5 box arch unit pieces 100 as one arch rib section, lifting the front 4 box arch unit pieces 100 of the arch rib section after adjusting the size of each arch rib section, and pre-assembling the rest box arch unit pieces 100 as standard sections and the rear 4 box arch unit pieces 100 as next round. In the process of pre-splicing of each wheel of inner web plate units 6, pre-splicing of diaphragm plate units 4, pre-splicing of top plate units 9, pre-splicing of bottom plate units 8 and pre-splicing of outer web plate units 2, all control points are adjusted on a pre-splicing jig frame 10 to meet requirements, the steel plate allowance is cut according to landmark marking lines of the control points, ports are corrected, allowance cutting is cut by a flame cutting machine, after the requirements are met, two adjacent box arch unit pieces 100 are temporarily fixed through a horse plate, and the butt joint of the top plate units 9, the butt joint of the bottom plate units 8, the butt joint of the inner web plate units 6 and the butt joint of the outer web plate units 2 between the two adjacent box arch unit pieces 100 are arranged in a staggered mode. When the pre-assembly is carried out on the pre-assembly site, when the sizes of the arch rib sections are wrong or the pre-camber is inconsistent, the sizes of the matched parts can be corrected and adjusted on the pre-assembly site, so that the adjustment at high altitude is avoided, the high-altitude operation difficulty is reduced, and the smooth erection of the steel box arch is ensured. After the arch rib segment is pre-assembled and qualified, derusting and coating are carried out, various marks are drawn according to the process requirements, and the main marks are as follows: a port transverse inspection line, a time scale height measuring point on a segment bridge, and the like.
According to the manufacturing method for the curved curve of the steel box arch, the curve matched with the linear curve of the pre-assembled arch rib is formed at the arch tops and the arch bottoms of the inner and outer web units 2 and 6 during blanking, so that the manufactured steel box arch unit 100 is consistent with the line type of the arch bridge.
According to the manufacturing method for the steel box arch curve bending, the assembling of the single box arch unit piece 100 and the pre-assembling of the plurality of box arch unit pieces 100 are carried out simultaneously, the number of the required moulding beds in the assembling process can be reduced, and the cost is reduced.
According to the manufacturing method for the steel box arch curved part, only one jig frame is needed in the assembling process, so that materials do not need to be transferred among different jig frames, manpower is saved, and the production efficiency is improved.
According to the manufacturing method for the curved steel box arch, when the steel box arch unit 100 is pre-assembled, the outer web unit 2, the diaphragm plate unit 4, the inner web unit 6, the bottom plate unit 8 and the top plate unit 9 which form the box arch unit 100 are sequentially arranged on the jig for positioning, and compared with a mode that the whole box arch unit 100 is lifted and the jig is positioned in the prior art, the difficulty in lifting is reduced, and the requirement on the site is low.
The manufacturing method of the steel box arch curve is characterized in that when the steel box arch unit pieces 100 are pre-assembled, a mode that the plurality of steel box arch unit pieces 100 are manufactured together is adopted, namely, the inner web plate units 6 of the plurality of box arch unit pieces 100 are pre-assembled, the top plate units 9 and the bottom plate units 8 of the plurality of box arch unit pieces 100 are pre-assembled, and finally the outer web plate units 2 of the plurality of box arch unit pieces 100 are pre-assembled. The arrangement of the beveling can ensure that the welding of the steel plate is more reliable.
It can be understood that the number of the steel box arch unit pieces 100 included in each arch rib section can be set according to actual needs.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A manufacturing method for curved bending of a steel box arch unit element is characterized by comprising the following steps:
dividing a box arch unit piece: dividing the pre-assembled arch rib into a plurality of box arch unit pieces (100), wherein each box arch unit piece (100) comprises an outer web unit (2), a diaphragm plate unit (4), an inner web unit (6), a bottom plate unit (8) and a top plate unit (9);
manufacturing an outer web unit (2): according to the linear curve of the pre-assembled arch rib, steel plate blanking is carried out according to the computer lofting size to obtain an outer web unit (2), and the arch crown and the arch bottom of the outer web unit (2) are provided with curve radians matched with the linear curve of the pre-assembled arch rib;
manufacturing an inner web plate unit (6): according to the linear curve of the pre-assembled arch rib, blanking a steel plate according to the lofting size of a computer to obtain an inner web plate unit (6), wherein the arch crown and the arch bottom of the inner web plate unit (6) have curve radians matched with the linear curve of the pre-assembled arch rib;
manufacturing a diaphragm plate unit (4): blanking a steel plate according to the computer lofting size to obtain a diaphragm plate unit (4);
production of the floor unit (8): blanking a steel plate according to the computer lofting size to obtain a rectangular bottom plate unit (8);
production of the top plate unit (9): blanking a steel plate according to the computer lofting size to obtain a rectangular top plate unit (9);
pre-splicing: a plurality of box arch unit pieces (100) are assembled and pre-assembled on a pre-assembly jig (10).
2. The method for manufacturing the curved steel box arch unit piece according to claim 1, wherein in the pre-assembling step, every N box arch unit pieces (100) are pre-assembled as one arch rib section, each arch rib section is adjusted in size and then the front N-1 box arch unit pieces (100) of the arch rib section are hung, and the rest of the box arch unit pieces (100) are pre-assembled as a standard section and then pre-assembled with the rear N-1 box arch unit pieces (100) as a next round, which specifically comprises the following steps:
s21: surveying and marking control point landmarks of each arch rib segment to be spliced in a pre-splicing field according to the linear curve of the arch rib to be spliced in the wheel, setting out each control point by a computer, and manufacturing a pre-splicing jig frame (10) according to each control point;
s22: sequentially positioning the inner web units (6) of N box arch unit elements (100) in the pre-assembly of the wheel on a pre-assembly jig frame (10), and temporarily fixing the inner web units (6) of two adjacent box arch unit elements (100) through horse boards;
s23: temporarily fixing diaphragm plate units (4) on the inner web plate units (6) of the N box arch unit pieces (100) respectively;
s24: respectively positioning top plate units (9) of N box arch unit elements (100) on a pre-assembly jig frame (10), sequentially applying force to each top plate unit (9) by using a jack to enable the top plate unit (9) to be tightly propped against diaphragm plate units (4) of the corresponding box arch unit elements (100) so as to enable the top plate units (9) to be deformed into curved plates consistent with the curve radian of the arches of the corresponding inner web plate units (6), welding the top plate units (9) with the diaphragm plate units (4) and the inner web plate units (6) of the corresponding box arch unit elements (100), and temporarily fixing the top plate units (9) of the two adjacent box arch unit elements (100) through horse plates; respectively positioning the bottom plate units (8) of N box arch unit elements (100) on a pre-assembly jig frame (10), sequentially applying force to each bottom plate unit (8) by using a jack to enable the bottom plate units (8) to be tightly propped against the diaphragm plate units (4) of the corresponding box arch unit elements (100) so as to enable the bottom plate units (8) to be deformed into curved plates consistent with the curve radian at the arch bottom of the corresponding inner web plate unit (6), welding the bottom plate units (8) with the diaphragm plate units (4) and the inner web plate units (6) of the corresponding box arch unit elements (100), and temporarily fixing the bottom plate units (8) of the two adjacent box arch unit elements (100) through horse plates;
s25: the outer web units (2) of N box arch unit elements (100) are sequentially positioned on a pre-assembly jig (10), the outer web units (2) of two adjacent box arch unit elements (100) are temporarily fixed through horse plates, and box inner welding seams of the box arch unit elements (100) are welded, so that the inner web unit (6), the outer web unit (2), the top plate unit (9), the bottom plate unit (8) and the transverse diaphragm unit (4) of each box arch unit element (100) are connected together to form the box arch unit elements (100);
s26: and (3) removing the first N-1 box arch unit pieces (100) pre-spliced in the current round, reserving the last box arch unit piece (100) as a pre-splicing reference segment of the next round, and repeating the steps S22 to S26 until the pre-splicing of all the steel box arch unit pieces (100) is completed.
3. The method for manufacturing the curved single steel box arch element according to claim 1, wherein N is an integer not less than 5, and the maximum size of the pre-assembly jig frame (10) is 12.45m by 35 m.
4. The manufacturing method of the curved single element of the steel box arch according to claim 1, wherein the outer web plate unit (2) and the inner web plate unit (6) both comprise a web plate (21) and a plurality of web plate longitudinal ribs (23) which are fixed on one side of the web plate (21) and arranged in parallel at intervals, the arch crown and the arch bottom of the web plate (21) are provided with curve radians matched with the linear curves of the pre-assembled arch ribs, and the web plate longitudinal ribs (23) and the arch crown and the arch bottom of the web plate (21) are arranged at intervals.
5. The manufacturing method of the curved steel box arch unit piece according to claim 4, wherein the manufacturing steps of the outer web plate unit (2) and the inner web plate unit (6) specifically comprise: blanking a steel plate according to the computer lofting size to obtain the web (21); a web plate (21) is scribed into a web plate arch rib linear curve, a web plate longitudinal rib datum line and a diaphragm plate unit datum line on a processing platform; grooving along the linear curve of the web arch rib by using a semi-automatic cutting machine; and welding the web longitudinal ribs (23) on the web (21) according to the web longitudinal rib reference line to obtain the outer web unit (2) and the inner web unit (6).
6. The manufacturing method of the curved steel box arch unit piece according to claim 1, wherein the top plate unit (9) comprises a top plate (91) and a plurality of top plate longitudinal ribs (93) fixed on one side of the top plate (91) and arranged in parallel at intervals, the top plate (91) is a rectangular plate, the bottom plate unit (8) comprises a bottom plate (81) and a plurality of bottom plate longitudinal ribs (83) fixed on one side of the bottom plate (81) and arranged in parallel at intervals, and the bottom plate (81) is a rectangular plate.
7. The manufacturing method of the curved steel box arch unit piece according to claim 6, wherein the manufacturing steps of the top plate unit (9) specifically include: blanking a steel plate according to the computer lofting size to obtain the top plate (91); marking a top plate contour line and a top plate longitudinal rib datum line on a machining platform by a top plate (91); performing flame precision cutting and grooving along the contour line of the top plate by using a semi-automatic cutting machine; and welding the top plate longitudinal ribs (93) on the top plate (91) according to the top plate longitudinal rib reference lines to form top plate units (9).
8. The manufacturing method of the curved steel box arch unit piece according to claim 6, wherein the manufacturing steps of the bottom plate unit (8) specifically comprise: blanking a steel plate according to the computer lofting size to obtain the bottom plate (81); marking a bottom plate contour line and a bottom plate longitudinal rib datum line on a processing platform by a bottom plate (81); performing flame precision cutting and grooving along the contour line of the bottom plate by using a semi-automatic cutting machine; and welding the longitudinal ribs (83) of the bottom plate on the bottom plate (81) according to the reference lines of the longitudinal ribs of the bottom plate to form a bottom plate unit (8).
9. The method for manufacturing the curved steel box arch unit piece according to claim 1, wherein a plurality of box arch unit pieces (100) are pre-assembled symmetrically from arch feet to arches in the pre-assembling process.
10. The method for manufacturing the curved steel box arch unit piece according to claim 1, wherein the joint of the top plate unit (9), the joint of the bottom plate unit (8), the joint of the inner web unit (6) and the joint of the outer web unit (2) in two adjacent box arch unit pieces (100) are arranged in a staggered manner.
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| CN111636303A (en) * | 2020-05-22 | 2020-09-08 | 中铁上海工程局集团有限公司 | Cross baseline control method for block assembly manufacturing of curved steel box structure |
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| CN114043170A (en) * | 2021-11-12 | 2022-02-15 | 中铁山桥集团有限公司 | Manufacturing method of hexagonal steel box arch |
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