CN114960450A - Method for manufacturing and constructing multi-span asymmetric bridge special-shaped steel arch - Google Patents
Method for manufacturing and constructing multi-span asymmetric bridge special-shaped steel arch Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a method for manufacturing and constructing a multi-span asymmetric bridge deformed steel arch, which comprises the following steps: s1, arch springing construction; the method specifically comprises the following steps of a, treating a foundation pit; b. pouring a bearing platform; c. backfilling a foundation pit; d. pouring arch springing concrete; s2, prefabricating a steel arch box girder; the method specifically comprises the following steps of a, segmenting a steel arch; b. pretreating a steel plate; c. lofting the steel box girder; d. blanking parts; e. connecting a part plate; f. manufacturing a plate unit; g. assembling and welding a U shape; h. processing and assembling the decorative plate; s3, mounting a main arch and an auxiliary arch; a. erecting and pre-assembling a bracket; b. and hoisting the crane in sections. The construction scheme is designed according to local river channel conditions and traffic conditions, so that the construction period is guaranteed, and the engineering quality is improved.
Description
Technical Field
The invention belongs to the field of steel arch manufacturing, and particularly relates to a manufacturing and construction method of a multi-span type asymmetric bridge special-shaped steel arch.
Background
In the design of large-scale steel structure bridges, steel structure arch ribs or tower structures are often adopted as supplements to main bridges, and the main bridges are mainly used for bearing the load under stress or striving for beauty or both. The steel arch type also varies: the bridge can be divided into a bridge spanning type vertical to the main bridge or forming a certain angle and a bridge following type parallel to the main bridge according to the connection mode with the main bridge, and the bridge following type is divided into a single arch type and a double arch type; the Xiguan bridge is set for crossing the white stone river for the northbound engineering of the Xiguan street in Qingxu county. The total length of the bridge is 120m, the bridge is divided into two parts, the total width is 51m, the number of a central pile is K0+125, the upper structure adopts 6-20m fabricated prestressed concrete simply-supported small box girder, and the right front included angle is 69 degrees; the lower structure abutment adopts a rib plate abutment, the pier adopts a column pier, and the abutment adopts a bored cast-in-place pile foundation.
Disclosure of Invention
In view of the above, the invention aims to provide a method for manufacturing and constructing a multi-span asymmetric bridge deformed steel arch, which is designed according to local river channel conditions and traffic conditions, so as to ensure a construction period and improve the engineering quality.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the manufacturing and construction method of the multi-span asymmetric bridge deformed steel arch comprises the following steps:
s1, arch springing construction; the method specifically comprises the following steps of a, treating a foundation pit; b. pouring a bearing platform; c. backfilling a foundation pit; d. pouring arch springing concrete;
s2, prefabricating a steel arch box girder; the method specifically comprises the following steps of a, segmenting a steel arch; b. pretreating a steel plate; c. lofting the steel box girder; d. blanking parts; e. connecting a part plate; f. manufacturing a plate unit, building a jig frame and pre-assembling; g. assembling and welding a U shape; h. processing and assembling the decorative plate;
s3, installing a main arch and an auxiliary arch and hoisting a crane in a segmented manner.
Further, the steel arch comprises a main arch and an auxiliary arch, which are both composed of a plurality of box girders, wherein the main arch obliquely spans the bridge, and the auxiliary arch spans the bridge; the box girder of the main arch is sequentially divided into a main A1 section, a main B1 section, a main C1 section, a main D1 section, a main E section, a main D2 section, a main C2 section, a main B2 section and a main A2 section;
the box girder of the auxiliary arch is sequentially divided into an auxiliary A section, an auxiliary B section, an auxiliary C section, an auxiliary D section, an auxiliary E section, an auxiliary F section, an auxiliary G section, an auxiliary H section, an auxiliary I section and an auxiliary J section.
Further, the steel arch box girder comprises a top plate, a bottom plate, a web plate and a partition plate; the two sides of the top plate are respectively connected to the bottom plate through a web plate, so that the top plate, the bottom plate and the two web plates form an annular structure provided with a cavity, and a plurality of partition plates arranged in parallel are further arranged in the cavity to form the steel arch box girder; the middle part of each baffle all is equipped with the via hole, is equipped with the cat ladder in the passageway that a plurality of via holes were formed.
Furthermore, the outer surface of the steel arch box girder is provided with a reinforced rib, the reinforced rib comprises a plurality of vertical ribs and a plurality of transverse ribs, the vertical ribs are parallel to the axis of the steel arch box girder, the top plate, the bottom plate and the two webs are respectively provided with one vertical rib, the vertical ribs and each plate are respectively welded with one transverse rib, and the steel arch box girder, the transverse ribs and the vertical ribs form a whole.
Furthermore, the decorative plate is welded to the transverse rib, and the installed device plate wraps the steel arch box girder.
Furthermore, the whole decorative plate is in a shield shape, namely four edges of the decorative plate are all in a curved surface structure, the decorative plate is modeled by TEKLA, and the device plate is produced by adopting a construction process of bending instead of bending.
Further, in S2, TAKLE modeling and CAD lofting technology are adopted to accurately loft the steel box girder, theoretical detailed drawings of parts of each component are drawn, welding shrinkage compensation amount, machining allowance and linear adjustment amount are reserved and manufactured and installed according to process requirements, and the obtained part size is used as a basis for drawing a blanking nesting drawing and numerical control programming.
Further, the jig frame consists of vertical supports, transverse supports, inclined supports, transverse beams and tooth plates, the lower surfaces of the transverse supports are fixed with the bottom surface through the vertical supports and the inclined supports, the bottom of the transverse beam is installed on the upper surfaces of the transverse supports through a plurality of pressing plates, and the step of setting up the jig frame comprises jig frame lofting, transverse support and inclined support, installation of the transverse beams and retesting of the position and the elevation of the jig frame; the jig frame pre-assembling step is that each subsection is manufactured and welded on the same jig frame, a bottom plate, a top plate and a web plate at each subsection are welded and fixed by using code plates, and the code plates are disassembled after each subsection is manufactured, so that the pre-assembling purpose is achieved.
Further, U-shaped assembling and welding, wherein the steps comprise a top plate upper mold, a partition plate upper mold and a web plate upper mold; after the U-shaped assembly is finished, U-shaped welding is carried out; welding the top plate, the welding seams among the web plates and the partition plates and the reinforced ribs on the web plates and the top plate; and (5) discharging the arch section and turning over for welding.
Furthermore, after welding is finished, the arch body needs to be cleaned and polished, and after the cleaning and polishing work is finished, the arch section can be painted; the blanking of the decorative plate is carried out by using a numerical control cutting machine, the decorative plate needs to be bent after the blanking is finished, and the forming purpose is achieved by adjusting the radius of the arc through a bending machine according to arc data given by a drawing when the decorative plate is bent.
Compared with the prior art, the manufacturing and construction method of the multi-span asymmetric bridge deformed steel arch has the following advantages:
(1) the invention relates to a manufacturing and construction method of a multi-span asymmetric bridge special-shaped steel arch, which utilizes a limited space and adopts a combined bracket pre-assembly construction process to ensure the quality control of the steel arch construction technology.
(2) The invention relates to a method for manufacturing and constructing a multi-span asymmetric bridge special-shaped steel arch.A shield-shaped decorative plate is processed by TEKLA modeling and a construction process of bending instead of bending, thereby successfully solving the technical problem of processing double curved surfaces.
(3) The invention relates to a method for manufacturing and constructing a multi-span asymmetric bridge deformed steel arch, which designs a temporary support by adopting a core tube structure design principle, ensures the stability of the support and reduces the integral dead weight of the support.
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 schematic sectional view of a main arch according to an embodiment of the present invention;
FIG. 2 is a sectional view of a secondary arch according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of concrete placement of the arch springing according to an embodiment of the present invention;
FIG. 4 is a schematic view illustrating the manufacture of a diaphragm plate unit piece according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a bed-jig and a steel box girder according to an embodiment of the invention;
FIG. 6 is a schematic layout of primary arches and secondary arches in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of a rack layout according to an embodiment of the present invention;
FIG. 8 is a schematic view of the assembly of the steel box girder according to the embodiment of the invention;
FIG. 9 is a schematic view of a trim panel assembly according to an embodiment of the present invention;
FIG. 10 is a schematic elevation of a main arch according to an embodiment of the invention;
FIG. 11 is a schematic elevation of a secondary arch according to an embodiment of the invention;
fig. 12 is a construction drawing of lofting considering the new pre-camber according to the embodiment of the present invention.
Description of reference numerals:
1. a main arch; 2. a secondary arch; 3. a top plate; 4. a web; 5. a partition plate; 6. a base plate; 7. a decorative plate; 8. vertically supporting; 9. a cross brace; 10. bracing; 11. a cross beam; 12. a dental plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention 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 Xiguan bridge is set for crossing the white stone river for the northbound engineering of the Xiguan street in Qingxu county. The total length of the bridge is 120m, the bridge is divided into two parts, the total width is 51m, the number of a central pile is K0+125, the upper structure adopts 6-20m fabricated prestressed concrete simply-supported small box girder, and the right front included angle is 69 degrees; the lower structure abutment adopts a rib plate abutment, the pier adopts a column pier, and the abutment adopts a bored pile foundation. The landscape scheme adopts asymmetric skew arches to form a bridge model, the main arch is higher than the bridge deck 52.737m, and the auxiliary arch is higher than the bridge deck 32.085 m. The north road of the riverside passes through the sixth span of the bridge;
the engineering steel arch is composed of a main arch, an auxiliary arch and a suspender, wherein the main arch is higher than a bridge surface 52.737m, the span is 123.15m, the height of the cross section is 2m to 3.6m, the main arch is in a shield shape, the thicknesses of selected plates are different according to different stress in different arch sections, the thicknesses of a top plate, a bottom plate and a web plate are 20mm, the thickness of a partition plate is 12mm, the arrangement interval is 2m, the bending part and arch feet of the steel arch are reinforced, the thickness is 20mm, and the arrangement interval is 1 m. The connection between the beam sections is mainly welded.
The auxiliary arch is higher than a bridge deck 32.085m, the span is 85m, the height of the cross section is 1.8m to 2.8m, the auxiliary arch is in a shield shape, the thicknesses of the selected plates are different according to different stress in different arch direction sections of the auxiliary arch, the thicknesses of the top plate, the bottom plate and the web plate are all 20mm, the thickness of the partition plate is 12mm, the arrangement distance is 2m, the bending part and the arch foot of the steel arch are reinforced, the thickness is 20mm, and the arrangement distance is 1 m.
The main arch uses 16 suspenders, the upper part is connected into the arch side center 15m, the distribution interval is 1m, the lower part is connected into two green belt embedded parts, the auxiliary arch uses 7 suspenders, the upper part is connected into the arch side center 6m, the distribution interval is 1m, and the lower part is connected to the outside of the bridge east. The sling material is a pin joint inhaul cable without an adhesive epoxy coating, and the number of stranded wires is 3. As shown in fig. 10 and 11.
The manufacturing and construction method of the multi-span asymmetric bridge deformed steel arch comprises the following steps:
s1, arch springing construction; the method specifically comprises the following steps of a, treating a foundation pit; measuring and lofting 4 corner points of each bearing platform according to a construction drawing design file and a measurement control point, using a cross pile at the center of the bearing platform, keeping the distance between the cross pile and the excavation upper opening of a foundation pit of the bearing platform at 1.5-2.0 m, and making marks; a foundation pit of the bearing platform is excavated by adopting 1:1 slope-making, the depth of the pit bottom is reserved for 0.5m, the foundation pit is excavated by adopting manual cooperation, and the bottom of the foundation pit is excavated by reserving a working space of 70cm around according to the dimension of a drawing.
A bearing platform template: the bearing platform template adopts a combined steel template and is installed by using a 25t truck crane in a matching way. The pull rod adopts a bolt with the diameter of 22mm, the round rod type die pull rod adopts a counter-pulling mode to reinforce the template, and the row spacing is 0.7 m;
an arch springing template: the arch springing template adopts a combined special-shaped closed steel template, a straight section adopts a 1.5X 2 (1.5X 1.6) straight template to be processed into an arc section of R3658 (2846), and the arc section is formed by processing a support with the thickness of 3mm and the interval of the back of an arc steel plate of 300 mm; the arch foot dome-smearing part is formed by supporting and processing the back of an arc-shaped steel plate with the thickness of 3mm and ribbed plates with the interval of 250 mm; the arch springing is smeared round bottom and is adopted 50mm 4mm thick square steel interval 250mm to consolidate, and the main body skeleton adopts 16# a type channel-section steel.
And (3) installing the template by using a 25t truck crane in a matching way, wherein all template pull rods are external pull rods, and the row spacing is 0.8 m. The connecting seam on the inner side of the template adopts an adhesive tape joint, and the outer side of the template is supported by a channel steel back rib. According to the construction requirement, the steel-concrete combined section is poured when a steel structure is required to be installed, the lower end of the steel-concrete combined section is temporarily welded by adopting a steel plate, so that the template becomes a closed whole, and a feed opening and a vibrating opening are reserved on the steel plate.
b. Pouring the bearing platform, and finishing pouring the bearing platform at one time; c. backfilling a foundation pit; d. pouring the concrete of the arch springing, wherein the arch springing is poured twice and divided into a concrete section and a steel arch combining section, as shown in figure 3;
after the concrete in the steel-concrete section reaches 95% of the design strength and the age of the concrete is not less than 7d, tensioning a prestressed steel bundle, wherein one end of the steel bundle is tensioned, and the control stress under an anchor is 0.73 fpk-1357.8 Mpa; the anchor backing plate is installed at the position 20cm from the bottom of the bearing platform and serves as an anchoring end, the temporary positioning plate is welded by reinforcing steel bars after positioning and lofting, and the anchor backing plate is installed according to coordinates provided by a design drawing.
S2, prefabricating a steel arch box girder; the method specifically comprises the following steps of a, segmenting a steel arch; further, as shown in fig. 6, the steel arch includes a main arch and an auxiliary arch, each of which is composed of a plurality of box girders, the main arch spans the bridge obliquely, and the auxiliary arch spans the bridge; the box girder of the main arch is sequentially divided into a main A1 section, a main B1 section, a main C1 section, a main D1 section, a main E section, a main D2 section, a main C2 section, a main B2 section and a main A2 section; the box girder of the auxiliary arch is sequentially divided into an auxiliary A section, an auxiliary B section, an auxiliary C section, an auxiliary D section, an auxiliary E section, an auxiliary F section, an auxiliary G section, an auxiliary H section, an auxiliary I section and an auxiliary J section, as shown in fig. 1 and fig. 2.
b. Pretreating a steel plate; the main body structure of the steel arch adopts Q355D steel, the zipper part adopts Q355D-Z25 steel, and the decorative plate part adopts Q235B steel; after the steel plate arrives at a factory, performing surface pretreatment on the steel plate by using a shot blasting machine to ensure that the surface roughness of the steel plate reaches the standard requirement; after the steel plate is subjected to shot blasting treatment, in order to prevent rusting, the epoxy zinc-rich primer is sprayed, and the thickness of the coating is 20 microns;
c. lofting the steel box girder; adopting TAKLE modeling and CAD lofting technology to accurately loft the steel box girder, drawing theoretical detailed drawings of parts of each component, then reserving and manufacturing and installing welding shrinkage compensation quantity, machining allowance and linear adjustment quantity according to process requirements, and taking the obtained part size as a basis for drawing a blanking jacking drawing and numerical control programming.
d. Blanking parts; (1) each part steel arch of the steel arch is blanked by using a numerical control cutting machine and a semi-automatic cutting machine, the cutting error of the part is controlled within +/-2 mm, sundries such as cutting edge oxide skin and the like are removed after blanking is finished, part numbers are marked by using paint pens on the parts, and the parts are placed in order after being placed on shelves in a classified mode, so that the parts are convenient to use in subsequent processing;
(2) the welding groove of the part is operated by using a semi-automatic cutting machine, and impurities such as oxide skin at the edge of the groove are removed after the cutting is finished, and the groove is polished to be smooth;
(3) the main board, the web plate and the top board are all precisely cut, and only parts of ribs and transverse partition plates or parts which need to be machined after cutting are manually cut;
(4) the blanking size of the part is the theoretical size, the welding shrinkage, the machining allowance and the linear adjustment.
e. Connecting a part plate; the welding plate is welded into a full-penetration first-level welding line and adopts a V-shaped groove form, two steel plates need to be placed in a reversible deformation mode before welding to achieve the effect of reducing deformation, arc striking and extinguishing plates are additionally arranged at the beginning and the end of the welding line, the length of the arc striking and extinguishing plates is not less than 100mm, two protective weldings are firstly used for bottoming during welding, then a semi-automatic submerged arc machine is used for welding, then the steel plates are turned over, the inclusion defect at the root is eliminated by using a gas plane, and the welding plate is welded by using the semi-automatic submerged arc machine after being cleaned up. The minimum splicing length during plate splicing is not less than 1m, and the cross-shaped welding seams are staggered as much as possible during butt joint.
f. Manufacturing a plate unit; the manufacturing method comprises the steps of manufacturing top plates, bottom plates and web single elements, wherein the top plates, the bottom plates and the web single elements are similar in structural form, reinforcing structures of the top plates, the bottom plates and the web single elements are flat steel longitudinal ribs, the manufacturing process flow of the top plates, the bottom plates and the web single elements is described by taking the bottom plates as an example, and the face plates and the web single elements are manufactured on a support according to a design line type.
(1) Checking the incoming materials including part numbers, overall dimensions, diagonal lines, grooves, materials and furnace batch numbers;
(2) and the scribing work is finished on a special scribing platform. Drawing a single-element longitudinal and transverse positioning line, a structure assembly inspection line and a port inspection line according to the mark points on the platform and the steel belt;
(3) the longitudinal ribs are assembled on a special bracket for assembly. The panel is hung on a special bracket, the longitudinal ribs are placed, and the ends are aligned. The longitudinal ribs are assembled from one end to the other end;
(4) the unit element is arranged on the reversible deformation pressing bracket;
(5) single element rectification. Checking the flatness of the unit element, locally correcting by adopting flame, controlling the correction temperature to be 600-800 ℃, naturally cooling, and strictly prohibiting overburning, hammering and water cooling;
(6) and (4) hanging the single element on a special inspection platform, and inspecting the length, width, diagonal difference, welding quality, flatness and the like of the single element. And (5) marking the qualified unit pieces and then storing the qualified unit pieces.
Manufacturing process flow of the separator unit piece: a schematic view of the baffle is shown in figure 4,
(1) checking the incoming materials including part numbers, overall dimensions, diagonal lines, grooves, materials and furnace batch numbers;
(2) a manhole ring is arranged on the transverse clapboard assembling support;
(3) welding by CO2 gas shielded automatic welding, correcting flame after welding, controlling the correction temperature at 600-800 ℃, naturally cooling, and strictly prohibiting overburning, hammering and water cooling.
Building and pre-assembling a jig frame; as shown in fig. 5, the jig frame consists of vertical braces, transverse braces, inclined braces, cross beams and tooth plates, the lower surfaces of the transverse braces are fixed with the bottom surface through the vertical braces and the inclined braces, the bottoms of the cross beams are installed on the upper surfaces of the transverse braces through a plurality of press plates, and the step of setting up the jig frame comprises jig frame lofting, transverse bracing and inclined braces, cross beam installation and jig frame position and elevation remeasurement; the jig frame pre-assembling step is that each subsection is manufactured and welded on the same jig frame, a bottom plate, a top plate and a web plate at each subsection are welded and fixed by using code plates, and the code plates are disassembled after each subsection is manufactured, so that the pre-assembling purpose is achieved.
Firstly, setting out a jig frame, setting out one point every two meters (the distance between the point and a transverse clapboard of a main arch is the same), secondly, installing vertical braces and transverse braces, and utilizing a leveling instrument to measure to enable the height (50cm) of each vertical brace to be in the same plane; secondly, welding the cross braces and the inclined braces, and utilizing the leveling instrument to measure to ensure that the section elevations of each diaphragm plate are consistent, thereby ensuring the installation of the cross beam. The crossbeam is installed, utilizes the full stick-layer appearance to draw coordinate point (consider camber in advance) all accurate location (marking with the pen) with the Tekla modeling, ensures that the dental lamina location is accurate. Welding each dental plate to a positioning point uniformly according to the length of 25cm, measuring the uniform elevation of each dental plate by using a level gauge, dotting and scribing, and uniformly cutting to ensure that the height of each dental plate accords with the elevation of an extracted coordinate point; after the installation, the position and the elevation of the jig frame are retested, and the jig frame is accurately put into use.
Setting up the attention items of the jig: the step of building the jig frame does not conflict with the blanking cutting connecting plate, and is independently carried out after receiving the jig frame drawing;
the drawing is familiar with before the bed-jig is set up, the floor space of the bed-jig is measured after the steel arch is segmented, and the workshop site is planned and reasonably distributed. According to the weight and the size of the steel arch, section steel with proper section and length is selected to be used as a bed frame ground beam and a support, so that the potential safety hazard of processing is reduced;
after the field is determined, determining the coordinate origin of a jig frame, the positioning and the coordinates of any point on the jig frame and a known point outside the jig frame, wherein the three points need manual operation lofting of workers, the known point is determined by using a total station after the three points are determined, a coordinate system is determined by using the known two points on the jig frame, and then the jig frame lofting is carried out according to the point position and the coordinates given by a drawing;
changing the station position after the setting of the jig frame is finished, performing secondary re-inspection on the jig frame, and if errors exist, performing re-inspection on the jig frame after adjustment until the errors of all points of the jig frame are controlled within +/-5 mm;
after the dental lamina location is accomplished, consolidate the bed-jig crossbeam, couple together every crossbeam, do the bearing diagonal reinforcement between the crossbeam lower prop. As shown in fig. 5.
g. Assembling and welding a U shape; comprises a top plate upper tire, a clapboard upper tire and a web plate upper tire; after the U-shaped assembly is finished, U-shaped welding is carried out; welding the top plate, the welding seams among the web plates and the partition plates and the reinforced ribs on the web plates and the top plate; the arch section is laid and turned over for welding; (1) after the support is erected, the connected top plate is placed at a proper position on the support, attention is paid to the fact that the error of a positioning point of the top plate is not larger than +/-5 mm, the top plate at the steel arch subsection position and the top plate are connected, leveled and fixed through a stacking plate, and 5mm is reserved in the middle of a plate seam and used for on-site single-side welding. (2) Just can add muscle and baffle on the roof and add muscle fixed-position welding on the roof after the child is accomplished on the roof, carry out the child on the baffle again, do the support reinforcement with leftover bits after the child location on the baffle, prevent that the baffle from heeling, the roof adds the muscle and also need spot welding to consolidate with the baffle. (3) After the partition board is reinforced, the web plate reinforcement is plugged into the partition board manhole, then the web plate is started to be installed, the web plate and the top plate are fixed by using the stacking plate, the position of the web plate is adjusted by using the jack and the chain block, the web plate is in accordance with the positioning point and then is reinforced, and web plate ribs in the partition board manhole are positioned on the web plate through adjustment. (4) The positions of butt welding seams of the steel plates are properly adjusted during assembly of the top plate, the bottom plate, the web plate and the partition plate, and the adjacent welding seams are staggered by at least 200 mm. The main box girder final assembly process flow is shown in figure 8,
and correcting after welding; after the U-shaped assembly is finished for one section, U-shaped welding can be started, welding seams among the top plate, the web plate and the partition plate and reinforced ribs on the web plate and the top plate are mainly welded in a fillet welding mode and a vertical welding mode, wherein the fillet welding seam among the top plate and the web plate is a full penetration primary welding seam, the welding seams among the partition plate, the top plate and the web plate are full penetration primary welding seams, and the welding seams among the reinforced ribs, the top plate and the web plate are secondary penetration deep welding seams;
for fillet weld between a top plate and a web plate, in order to ensure the quality requirement of the weld, the web plate is provided with a single 45-degree slope, the direction of the slope faces to the steel arch bin, welding is carried out in the bin at present, after the welding is finished, defects such as inclusions, air holes and the like at the bottom of the welding are removed by air planing at the outer side, and the weld bead is cleaned and then welded;
because the welding seam between the partition board and the web plate adopts a vertical welding mode, the welding difficulty is high, and flux-cored wires are used for welding in order to ensure the welding quality;
after welding, detecting the welding seam by using an ultrasonic flaw detector and a ray flaw detector, and repairing unqualified parts if the welding seam is detected, until all the welding seams are qualified;
and (3) arch section blanking and turning over welding:
(1) after the steel arch bottom plate is buckled, welding temporary hoisting lugs and turning-over lugs on the arch body, wherein the hoisting lugs and the arch body are welded in a full penetration mode; after the welding of the lifting lugs is finished, the positioning code plates at the connection positions of the arch sections are opened, and proper steel wire ropes and clamping rings are selected for hoisting of the lower tire;
(2) the arch section is placed on a split heads after being laid off, and can not directly fall on the ground, so that the deformation of the components due to uneven stress is prevented;
(3) reinforcing the arch body after the tire is removed, turning over for 90 degrees, enabling the arch body web plate to face downwards, removing temporary lifting lugs on the top plate, welding lifting lugs on the top plate, turning over for 90 degrees, and turning over the bottom plate downwards until turning over is completed;
(4) and finally welding the arch body after turning over, wherein the welding seam of the base plate, the web plate and the partition plate is mainly adopted, the welding seam of the base plate reinforcement and the base plate is adopted, the welding seam of the web plate reinforcement and the welding seam of the other side of the web plate are adopted, and the requirements of the welding seam are the same as the requirements of the welding seam in the prior art.
And (4) after-welding correction, due to the characteristic that steel is deformed by heating, the arc section can be deformed locally after welding, and flame correction is carried out on the arc body in order to ensure the original size and smooth linear appearance of the arc body. The surface, bottom and web plate single elements are locally corrected by fire, welding seam areas are corrected on the non-structural side of the single elements to eliminate welding angle deformation, and then wave deformation and torsional deformation of the ends of the single elements are corrected on a plane support. The end head is straightened by adopting channel steel and turnbuckle screws in the end head wave deformation and then is subjected to fire correction; the diaphragm plate is a supporting system of the whole steel box girder, has higher requirement on the planeness, and the welding deformation of the diaphragm plate mainly comprises the thin deformation of plates between the stiffening plates and the buckling deformation along the bridge width direction. Welding deformation of the diaphragm single element is mainly realized by strictly controlling the welding specification and adopting low-current CO2 gas shielded welding to reduce the welding line energy as much as possible; the welding sequence is strictly controlled by adopting symmetrical welding and sectional desoldering, and the welding work is carried out in different regions, so that the welding heat energy is dispersed. And arranging a certain amount of reverse deformation on the welding bracket along the bridge width direction of the diaphragm plate to eliminate buckling deformation. The correction of the diaphragm plate single element is mainly performed by flame correction, and the correction of the local free edge of the plate edge is assisted by tools such as clamping codes and the like.
h. Processing and assembling the decorative plate; as shown in figure 9 of the drawings,
straight-line decorative panels (single curved); the blanking of the decorative plate is carried out by using a numerical control cutting machine, the decorative plate needs to be bent after the blanking is finished, the size of the arc radius is adjusted by a bending machine according to the arc data given by a drawing during bending to achieve the purpose of forming (the size and the bending radius of each section of decorative plate are shown in the drawings of the main arch decorative plate and the auxiliary arch decorative plate in detail), the first decorative plate needs to be adjusted for many times, and the requirement of linear mass production is met. The steel arch decorative plate has a section of 2 meters per each, each section is divided into 4 sections, two blocks on the top plate side are assembled firstly during assembly, then two blocks on the top plate side are assembled, and the steel arch decorative plate can avoid turning over again after the assembly is completed;
the decorative board must assemble earlier before the decorative board assembly and adds the muscle, it includes a plurality of vertical ribs and a plurality of cross rib to add the muscle, and vertical rib is parallel with the axis that the box girder was encircleed to the steel, all is equipped with a vertical rib on roof, bottom plate and two webs, and a cross rib is all welded with every panel to vertical rib, and the steel encircles the whole of box girder, cross rib and vertical rib formation.
Further, the decorative plate is welded to the transverse rib, and the installed device plate wraps the steel arch box girder; a6 mm gap is reserved between the decorative plates, and gap welding is adopted for welding the decorative plates. Because the space between the steel arch main body and the decorative plate is narrow, the plug welding mode is adopted in the place where the decorative plate and the reinforcement can not be directly welded.
Processing and assembling the arc-segment decorative plate (hyperbolic); the blanking process of the arc-segment decorative plate is the same as that of the straight segment, the bending process of the decorative plate is also the same as that of the straight segment, and the decorative plate needs to be bent according to the cross section direction. Assembling the arc-section decorative plate, wherein the cross section direction is also carried out according to a bending line type, the longitudinal arc line is assembled in a bending mode, and arc transition treatment is carried out on the position of the bending point after the assembly is finished; the other procedures are consistent with the straight line segment.
Grinding and painting the arch body, and processing and assembling the decorative plate; cleaning and grinding the arch body and spraying paint; after welding, the arch body needs to be cleaned and polished, impurities such as welding slag welding spots, dust, oil stains and the like on the surface of the component and the inner bin are removed, the groove of the butt joint is wrapped by the adhesive tape, and the condition that the sprayed paint affects on-site welding is prevented. After the cleaning and grinding work is finished, the arch section can be subjected to paint spraying treatment, and the coating requirements are shown in the following table;
the decorative plate is machined and assembled, the decorative plate is blanked by using a numerical control cutting machine, bending machining is required after blanking is finished, and the purpose of forming is achieved by adjusting the radius of an arc through a bending machine according to arc data given by a drawing during bending;
the first decorative panel must be adjusted multiple times to meet the final linearity and begin mass production.
The bent decorative plate is assembled after being cleaned and painted, so that the situation that the decorative plate cannot be painted due to limited operation space after being assembled is avoided; the steel arch decorative plate has a section of 2 meters per each, each section is divided into 4 sections, two blocks on the top plate side are assembled firstly during assembly, then two blocks on the top plate side are assembled, and the steel arch decorative plate can avoid turning over again after the assembly is completed; before the decorative plate is assembled, decorative plate reinforcements are assembled, the decorative plate reinforcements are divided into vertical ribs and transverse ribs, the vertical ribs are welded on the steel arch main body, the transverse ribs are welded on the vertical ribs, and the decorative plate is assembled, positioned and welded on the transverse ribs; reserving a 6mm gap between the decorative plates, and welding the decorative plates by adopting gap welding; because the space between the steel arch main body and the decorative plate is narrow, the plug welding mode is adopted in the place where the decorative plate and the reinforcement can not be directly welded.
As shown in fig. 9
S3, mounting a main arch and an auxiliary arch;
support arrangement and base type: according to the steel arch segmentation and on-site construction process, the engineering designs and builds 15 groups of brackets, 8 groups of main arches (numbered from south to north: bracket Z-1 to bracket Z-8), 7 groups of auxiliary arches (numbered from south to north: bracket F-1 to bracket F-7), as shown in figure 7,
designing a bracket: the main arch DED section (support 4), bracing member select phi 200X 8 steel pipe, and the connection is, bracing and truss adopt L110X 8 and L80X 5 angle steel, and column top distribution beam is double block H550X 200X 8X 14, and the node is the welding. The lower part is provided with a foundation 4(12m 9m 0.6m), the interior of the foundation is connected with 350 x 16 embedded parts, the rest arch section brackets are connected with supporting members which are phi 426 x 8 steel pipes, the connecting system adopts a connector 16, a truss beam HN346 x 174 x 6 x 9 is made of Q235, the top distribution beam of the column is a double-spliced H550 x 200 x 8, and the nodes are welded. The lower part is provided with a foundation 1(7m × 3m × 1m), a foundation 2(5m × 3m × 1m), a foundation 3(3m × 1m), and 550 × 16 embedded parts for connection;
three to four phi 219 multiplied by 8 steel pipes are arranged below each section position on the upper distribution beam of the steel pipes as elevation adjusting devices. The field assembly part with the height of about 300mm-500mm is connected with the bracket steel pipe in a welding mode;
mounting a bracket: filling 1m of rubbles on the site support foundation according to the design, pouring a reinforced concrete foundation according to the scheme requirement, and installing the support when the strength of the foundation meets the design requirement; before installation, the positions of the embedded parts are retested, the support 10 meters is used as a section of standard section for ground assembly, and after all connecting pieces are welded, the embedded parts can be assembled if the supervision general packet is qualified.
And the support assembly is carried out by adopting a 130-ton truck crane, when the assembly is finished, settlement observation and displacement observation are required to be carried out, data recording is carried out, and when the support tends to be stable, the overall acceptance of the support is carried out.
And (5) hoisting the main arch and the auxiliary arch by sections. The main arch is divided into 9 segments. Longest segment D, 18.27 m. Heaviest segment C, 42.72 t. The secondary arch is divided into 10 segments, the longest segment E, F segment, 18.00 m. Heaviest segment E segment, 38.04 t.
By combining the construction conditions of the project, the bridge deck cannot bear more than 200 tons of cranes, so that the on-bridge hoisting cannot be met; the east side and the south side are provided with high-voltage wires which cannot meet the hoisting working condition. Hoisting the north side: the bridge span is 120m, the maximum hoisting radius of the north side hoisting reaches 123m, and the west side hoisting is selected in consideration of safety and economy. In the project, the steel arch is installed on site by adopting a crawler crane, 1 650-ton crawler crane is adopted, and 80t and 130t truck cranes are installed in a matching way;
analyzing the hoisting working condition;
(1) the main and auxiliary arch steel frameworks (including the foundations 1, 2 and 4) are more in sections during manufacturing, and are hoisted in situ by using an 80t truck crane, so that the construction site is better, and the working condition analysis is not performed;
(2) the main arch embedded section part and the auxiliary arch embedded section part (comprising a main arch A section and an auxiliary arch A, D, I, J section) are hoisted by selecting 130t automobile hoisting side positions, wherein the maximum hoisting capacity is 39.34t, the hoisting hook and the rigging are 1t, the safety factor is 1.3 times, the total is 51.14t, the maximum hoisting radius is not more than 8m, the maximum hoisting capacity is 57 t when the main arm is 21.28 m, and is more than 51.14t, and the hoisting specification is met.
(3) In a main arch hoisting section (a main arch B, C, D, E section), 650t of crawler crane is selected for hoisting, the maximum hoisting is performed at 42.72t of a main arch C section, crawler crane hooks (6 x 2 multiplying power and 230t of hook weight are selected and 7.4t of hook weight) and rigging 10t, the safety factor is 1.3 times, the total hoisting capacity is 68.54t, the hoisting radius is 54.6m, the hoisting capacity at the position of the 650t of crawler crane is 102t, the hoisting specification is met, and other sections all meet the hoisting specification.
(4) In a single-arch hoisting section (an auxiliary arch section B, C, E, F, H) of the auxiliary arch, 650t of crawler crane is selected for hoisting, the maximum hoisting is in a C section 38.04t of the main arch, crawler crane hooks (6 x 2 multiplying power and 230t of hook weight being 7.4t) and rigging are 10t, the safety factor is 1.3 times, the total hoisting capacity is 62.45t, the hoisting radius is 67.19m, the hoisting capacity at the position of the 650t of crawler crane is 70t, the hoisting specification is met, the farthest hoisting radius is in an H section 82.05m of the auxiliary arch, the hoisting specification is met, and the rest sections meet the hoisting specification.
Further, as shown in fig. 5, the steel arch box girder includes a top plate, a bottom plate, a web plate and a partition plate; the two sides of the top plate are respectively connected to the bottom plate through a web plate, so that the top plate, the bottom plate and the two web plates form an annular structure provided with a cavity, and a plurality of partition plates arranged in parallel are further arranged in the cavity to form the steel arch box girder; the middle part of each baffle all is equipped with the via hole, is equipped with the cat ladder in the passageway that a plurality of via holes were formed. The crawling ladder segment is determined according to the steel arch camber so as to facilitate processing and penetration. And after the assembly welding of the crawling ladder is finished, the crawling ladder is subjected to cleaning and paint spraying treatment.
Furthermore, after welding is finished, the arch body needs to be cleaned and polished, and after the cleaning and polishing work is finished, the arch section can be painted; the blanking of the decorative plate is carried out by using a numerical control cutting machine, the decorative plate needs to be bent after the blanking is finished, and the forming purpose is achieved by adjusting the radius of the arc through a bending machine according to arc data given by a drawing when the decorative plate is bent.
Pre-camber control; according to the requirements of drawings, a pre-camber of 35cm is set at the top of a large span arch of the auxiliary arch, a TEKLA is adopted for modeling, a steel arch is raised by 35cm during CAD lofting, the drawing is drawn by considering the pre-camber in the aspects of blanking size and support manufacturing, and blanking is positioned according to the drawing with the pre-camber added, so that the arch springing and the arch crown are correspondingly changed. Performing construction lofting according to a modeling drawing; a new lofting construction plan taking into account pre-camber is shown in figure 12.
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 (10)
1. The manufacturing and construction method of the multi-span asymmetric bridge deformed steel arch comprises the following steps:
s1, arch springing construction; the method specifically comprises the following steps of a, treating a foundation pit; b. pouring a bearing platform; c. backfilling a foundation pit; d. pouring arch springing concrete;
s2, prefabricating a steel arch box girder; the method specifically comprises the following steps of a, segmenting the steel arch; b. pretreating a steel plate; c. lofting the steel box girder; d. blanking parts; e. connecting a part plate; f. manufacturing a plate unit, building a jig frame and pre-assembling; g. assembling and welding a U shape; h. processing and assembling the decorative plate;
s3, mounting a main arch and an auxiliary arch; and hoisting the crane in sections.
2. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 1, characterized in that: the steel arch comprises a main arch and an auxiliary arch which are both composed of a plurality of box girders, the main arch obliquely spans the bridge, and the auxiliary arch spans the bridge; the box girder of the main arch is sequentially divided into a main A1 section, a main B1 section, a main C1 section, a main D1 section, a main E section, a main D2 section, a main C2 section, a main B2 section and a main A2 section;
the box girder of the auxiliary arch is sequentially divided into an auxiliary A section, an auxiliary B section, an auxiliary C section, an auxiliary D section, an auxiliary E section, an auxiliary F section, an auxiliary G section, an auxiliary H section, an auxiliary I section and an auxiliary J section.
3. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 1, characterized in that: the steel arch box girder comprises a top plate, a bottom plate, a web plate and a clapboard; the two sides of the top plate are respectively connected to the bottom plate through a web plate, so that the top plate, the bottom plate and the two web plates form an annular structure provided with a cavity, and a plurality of partition plates arranged in parallel are further arranged in the cavity to form the steel arch box girder; the middle part of each baffle all is equipped with the via hole, is equipped with the cat ladder in the passageway that a plurality of via holes were formed.
4. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 3, characterized in that: the outer surface of the steel arch box girder is provided with a reinforcement, the reinforcement comprises a plurality of vertical ribs and a plurality of transverse ribs, the vertical ribs are parallel to the axis of the steel arch box girder, a vertical rib is arranged on each of the top plate, the bottom plate and the two webs, the vertical ribs and each of the plates are welded with one transverse rib, and the steel arch box girder, the transverse ribs and the vertical ribs form a whole.
5. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 4, characterized in that: the decorative plate is welded to the transverse rib, and the installed device plate wraps the steel arch box girder.
6. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 4, characterized in that: the whole shield form that is of decorative board, install the decorative board on steel arch and the vice arch and divide into straight section decorative board and arc section decorative board, and straight section decorative board is the single curved structure, and the arc section decorative board is hyperbolic structure, and the edge on four limits of hyperbolic decorative board is the curved surface structure promptly, the decorative board passes through TEKLA modeling, adopts to produce the device board with the bent construction technology of turning over instead.
7. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 1, characterized in that: and the steel box girder lofting adopts TAKLE modeling and CAD lofting technology to accurately loft the steel box girder, draw theoretical detailed drawings of parts of each component, reserve welding shrinkage compensation amount, machining allowance and linear adjustment amount according to process requirements, and obtain the part size as a basis for drawing a blanking nesting drawing and numerical control programming.
8. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 1, characterized in that: the jig frame consists of vertical braces, transverse braces, inclined braces, cross beams and tooth plates, wherein the lower surfaces of the transverse braces are fixed with the bottom surface through the vertical braces and the inclined braces, the bottom of the cross beam is installed on the upper surfaces of the transverse braces through a plurality of pressing plates, and the step of setting up the jig frame comprises jig frame lofting, transverse bracing and inclined braces, cross beam installation and support position and elevation remeasurement; the jig frame pre-assembly step is that each subsection is manufactured and welded on the same support, a bottom plate, a top plate and a web plate at each subsection are welded and fixed through code plates, and the code plates are removed after each subsection is manufactured, so that the pre-assembly purpose is achieved.
9. The manufacturing and construction method of the multi-span asymmetric bridge special-shaped steel arch according to claim 1, characterized in that: u-shaped assembling and welding, wherein the steps comprise a top plate upper mold, a partition plate upper mold and a web plate upper mold; after the U-shaped assembly is finished, U-shaped welding is carried out; welding the top plate, the welding seams among the web plates and the partition plates and the reinforced ribs on the web plates and the top plate; and (5) discharging the arch section and turning over for welding.
10. The method for manufacturing and constructing the multi-span asymmetric bridge deformed steel arch according to claim 9, wherein: after welding, the arch body needs to be cleaned and polished, and after the cleaning and polishing work is finished, the arch section can be painted; the blanking of the decorative plate is carried out by using a numerical control cutting machine, the decorative plate needs to be bent after the blanking is finished, and the forming purpose is achieved by adjusting the radius of the arc through a bending machine according to arc data given by a drawing when the decorative plate is bent.
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