CN115341467B - Highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure and construction method thereof - Google Patents
Highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure and construction method thereof Download PDFInfo
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- CN115341467B CN115341467B CN202210934626.4A CN202210934626A CN115341467B CN 115341467 B CN115341467 B CN 115341467B CN 202210934626 A CN202210934626 A CN 202210934626A CN 115341467 B CN115341467 B CN 115341467B
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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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention provides a highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure and a construction method thereof, wherein the structure comprises a steel anchor beam and steel bracket assemblies, and two ends of the steel anchor beam are correspondingly supported between the two oppositely arranged steel bracket assemblies; the first stiffening plate and the stiffening plate are arranged on the tower wall embedded steel plate, so that the shear strength and the structural stability of the tower wall embedded steel plate can be obviously improved; wherein, the stiffening plate is symmetrical with the steel corbel, can prevent to appear the fracture in the junction of steel corbel and tower wall pre-buried steel sheet because of the atress is overweight, and lead to the junction. The tower wall embedded steel plate can be connected with the tower column through shear nails, and also can be connected with the tower column through the first stiffening plate and the stiffening plate; in addition, the embedded steel plate of the tower wall, the first stiffening plate and the stiffening plate are all provided with shear nails, and the angles of the first shear nails, the second shear nails and the third shear nails are different, so that the connection firmness of the embedded steel plate of the tower wall and the tower column is greatly enhanced, and the shear strength is further improved.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a highway and railway dual-purpose river-crossing A-shaped stay cable anchoring structure and a construction method thereof.
Background
The cable-stayed bridge has the advantages of large span, high rigidity, light structure weight, low manufacturing cost and the like, and is widely applied to large-span bridge engineering. Wherein, the stay cable anchoring structure is an important component of the cable-stayed bridge. The stay cable anchoring structure comprises a steel bracket assembly and a steel anchor beam. A steel box girder is directly supported on each bracket top plate, the steel bracket component is a supporting structure of a steel anchor girder, and the installation precision and the structural fastness of the steel bracket component are directly in need of the safety performance of the stay cable anchoring structure.
However, the steel corbel assembly of the existing stay cable anchoring structure has the following problems: 1. the steel bracket component has low installation precision and is not easy to assemble with the steel anchor beam; 2. the steel corbel component has low strength and poor structural stability, is deformed and bent, and has potential safety hazards.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a stay cable anchoring structure and a construction method thereof, which can solve the defects in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
the river-crossing A-shaped stay cable anchoring structure for highway and railway comprises a steel anchor beam and steel bracket assemblies, wherein two ends of the steel anchor beam are correspondingly supported between the two oppositely arranged steel bracket assemblies;
the steel bracket assembly comprises a pre-buried steel plate unit and a steel bracket;
the pre-buried steel sheet unit includes:
the tower wall embedded steel plate is vertically arranged, and the steel corbel is fixedly arranged at the lower part of the inner side of the tower wall embedded steel plate;
the first stiffening plate is fixedly arranged on the outer side of the tower wall embedded steel plate, and a first shear nail is arranged on the first stiffening plate;
the reinforcing plate is horizontally and fixedly arranged on the outer side of the tower wall embedded steel plate and is distributed opposite to the steel corbels, and a second shear pin is arranged on the reinforcing plate;
the third shear pin is fixedly arranged on the outer side surface of the tower wall embedded steel plate;
the anchor pipe is characterized in that an anchor pipe hole corresponding to the anchor pipe is formed in the tower wall embedded steel plate, one end of the anchor pipe penetrates through the anchor pipe hole and then stretches out of the outer side of the tower wall embedded steel plate, and the other end of the anchor pipe points to an anchor backing plate on the steel anchor beam.
Preferably, the two steel corbels are symmetrically distributed along the vertical central line of the tower wall embedded steel plate;
the steel corbel includes:
the web plate is vertically fixed on one side of the tower wall embedded steel plate corresponding to the steel anchor beam;
the first top plate is horizontally and fixedly arranged at the top of the web plate and is correspondingly connected with the tower wall embedded steel plate, a base plate is arranged on the surface of the first top plate, and the steel anchor beam is supported on the base plate;
the first bottom plate is horizontally and fixedly arranged at the bottom of the web plate and is correspondingly connected with the tower wall embedded steel plate;
and the second stiffening plates are vertically and fixedly arranged on two sides of the web plate, the upper ends of the second stiffening plates are fixedly connected with the lower surface of the first top plate, and the side edges of the second stiffening plates are fixedly connected with the side surfaces of the web plate.
Preferably, the reinforcing plate comprises an upper reinforcing plate and a lower reinforcing plate, and the upper reinforcing plate corresponds to the shape, the size and the height of the first top plate; the lower reinforcing plate corresponds to the first bottom plate in shape, size and height.
Preferably, the first stiffening plate is divided into an upper section and a lower section;
the upper section of the first stiffening plate is positioned at the upper part of the upper stiffening plate, and the upper end and the lower end of the upper section of the first stiffening plate are respectively flush with the upper end of the tower wall embedded steel plate and the upper end surface of the first stiffening plate;
the first stiffening plate lower section is located between the upper stiffening plate and the lower stiffening plate.
A construction method of a road-railway dual-purpose river-crossing A-shaped stay cable anchoring structure comprises the following steps:
s1, respectively assembling a steel anchor beam and a steel bracket assembly, and temporarily reinforcing a matching member for an installation tool;
s2, machining the surface of a backing plate arranged between the steel anchor beam and the steel bracket so that the friction coefficient of the backing plate between the steel anchor beam and the bracket is less than or equal to 0.05;
s3, integrally assembling the steel anchor beam and the steel corbel assembly, applying a pretightening force to the steel anchor beam and the steel corbel connection high-strength bolts corresponding to the side span ends to form a consolidation state, temporarily consolidating the steel anchor beam and the steel corbel corresponding to the main span side by the high-strength bolts, and forming an integral structure by utilizing temporary reinforcement matching members;
s4, hoisting the steel anchor beams and the steel corbels integrally, and pouring concrete of the corresponding section tower columns according to the construction progress; before the corresponding stay cable is tensioned, releasing the pre-tightening force of the temporarily consolidated high-strength bolt on the main span side steel anchor beam, ensuring that the nut and the washer do not fall off, and dismantling the temporarily reinforced matching member for the assembly fixture;
and S5, after the full-bridge stay cable is tensioned, tightening high-strength bolts between the main span side steel anchor beam and the steel corbel, and completely locking the relative sliding between the steel anchor beam and the steel corbel.
Preferably, in the step S1, the assembling step of the steel bracket assembly is as follows:
s101, drawing a longitudinal and transverse datum line on the outer side of a tower wall embedded steel plate, drawing position lines of a first stiffening plate and a stiffening plate on the embedded side according to the longitudinal and transverse datum line, and assembling the first stiffening plate and the stiffening plate according to the position lines;
s102, marking a positioning line of a steel bracket and a projection line of an anchor pipe on the tower wall embedded steel plate on the inner side of the tower wall embedded steel plate;
s103, adopting a laser measuring instrument to cooperatively assemble the steel corbels, welding penetration weld joints of the steel corbels and the tower wall embedded steel plates, and then adopting post-welding flame to correct welding deformation;
s104, vertically arranging the tower wall embedded steel plate on a steel platform, and installing and welding the anchor pipe through the cooperation of the anchor pipe projection line and the projection ground sample.
Preferably, in the step S1, the step of assembling the steel corbel includes: firstly, horizontally placing a first top plate, and drawing a longitudinal and transverse datum line; sequentially drawing position lines of the web plate and the second stiffening plate according to the longitudinal and transverse datum lines, and sequentially assembling the web plate and the second stiffening plate according to the position lines; and then scribing a position line of the web on the first bottom plate, and assembling the web and the first bottom plate together according to the position line.
Preferably, in step S102, the deviation of the external dimensions of the pre-embedded steel plate of the tower wall is retested, the longitudinal and transverse base line is corrected during scribing, and then the longitudinal and transverse base line is used as a reference, and the assembling position of the top surface of the first top plate is found out as an assembling reference.
Preferably, in step S103, the web, the first top plate and the first bottom plate of the steel bracket are welded with the tower wall embedded steel plate respectively.
Preferably, in step S101, before assembling, the shear nails are welded Yu Dabi to the pre-embedded steel plate, the first stiffening plate and the stiffening plate in advance, and the shear nails affecting the weld joint part can be repair welded after the assembly of the single elements is completed.
The beneficial effects are that: according to the invention, the first stiffening plate and the stiffening plate are arranged on the tower wall embedded steel plate, so that the shear strength and the structural stability of the tower wall embedded steel plate can be obviously improved; wherein, the stiffening plate is symmetrical with the steel corbel, can prevent to appear the fracture in the junction of steel corbel and tower wall pre-buried steel sheet because of the atress is overweight, and lead to the junction. The tower wall embedded steel plate can be connected with the tower column through shear nails, and also can be connected with the tower column through the first stiffening plate and the stiffening plate; in addition, the embedded steel plate of the tower wall, the first stiffening plate and the stiffening plate are all provided with shear nails, and the angles of the first shear nails, the second shear nails and the third shear nails are different, so that the connection firmness of the embedded steel plate of the tower wall and the tower column is greatly enhanced, and the shear strength is further improved.
In conclusion, the steel bracket assembly is stable in structure, safe and reliable, and the overall stability and the safety and reliability of the stay cable anchoring structure are greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Wherein:
FIG. 1 is a schematic illustration of the installation of a stay cable anchoring structure in accordance with the present invention;
FIG. 2 is a schematic structural view of a stay cable anchoring structure according to the present invention;
FIG. 3 is a schematic view of the structure of a steel anchor beam of the present invention;
FIG. 4 is a schematic view of the steel corbel assembly of the present invention;
fig. 5 is an assembled schematic view of a tower wall embedded steel plate of the steel bracket assembly of the invention.
In the figure: 1. a tower column; 2. stay cables; 3. an anchor structure; 301. embedding steel plates on the tower wall; 302. a first base plate; 303. a web; 304. a backing plate; 305. a second stiffening plate; 306. a first top plate; 307. an upper reinforcing plate; 308. a lower reinforcing plate; 309. a first stiffening plate; 310. an anchor tube; 311. an anchor backing plate; 312. a second base plate; 313. a partition plate; 314. a side pulling plate; 315. transverse stiffening plates; 316. vertical stiffening plates; 317. and a pressure-bearing member.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
1-5, an A-shaped stay cable anchoring structure for a river is used for both highway and railway, the anchoring structure 3 comprises a steel anchor beam and steel corbel assemblies, a group of opposite steel corbel assemblies are positioned at two opposite sides of the interior of a hollow cable tower, two ends of the steel anchor beam are supported on a pair of steel corbel assemblies, and the steel corbel assemblies comprise pre-buried steel plate units and steel corbels. The steel anchor beam is connected with the steel bracket through bolts. The embedded steel plate unit comprises a tower wall embedded steel plate 301, a first stiffening plate 309, a third shear pin, an anchor pipe 310 and a stiffening plate: the tower wall embedded steel plate 301 is vertically arranged and is used for being connected with the tower column 1, steel corbels are fixedly arranged at the lower part of the inner side of the tower wall embedded steel plate 301, and anchor pipe 310 holes are formed in the middle of the tower wall embedded steel plate 301; an anchor pipe 310 hole corresponding to the anchor pipe 310 is formed in the tower wall embedded steel plate 301, one end of the anchor pipe 310 penetrates through the anchor pipe 310 hole and then extends out of the outer side of the tower wall embedded steel plate 301, and the other end of the anchor pipe 310 points to an anchor pad 311 on the steel anchor beam. The first stiffening plate 309 is fixedly arranged on the outer side of the tower wall embedded steel plate 301, and the first stiffening plate 309 is provided with first shear nails; the reinforcing plate is horizontally fixedly arranged on the outer side of the tower wall embedded steel plate 301 and is symmetrical to the steel corbel, and a second shear pin is arranged on the reinforcing plate; the third shear pin is fixedly arranged on the outer side face of the tower wall embedded steel plate 301. The tower wall embedded steel plate 301, the first stiffening plate 309, the stiffening plate, the first shear nails, the second shear nails and the third shear nails of the anchoring structure 3 of the stay cable 2 are all arranged in the concrete of the tower column 1 in a pouring mode, and the connection firmness between the tower wall embedded steel plate 301 and the tower column 1 is strong; the reinforcing plate and the steel corbel are distributed relatively, so that the joint of the steel corbel and the tower wall embedded steel plate 301 can be prevented from cracking due to overweight stress, and the safety and stability are improved. The tower wall embedded steel plate 301 has strong shearing resistance, can effectively prevent the tower wall embedded steel plate 301 from bending, and greatly improves the overall stability and the safety reliability of the anchoring structure 3.
In an alternative embodiment of the present invention, the first shear pin is disposed perpendicular to the first stiffener 309, the second shear pin is disposed perpendicular to the stiffener, and the third shear pin is disposed perpendicular to the tower wall pre-buried steel plate 301. Or the first shear nails are obliquely arranged with the first stiffening plates 309, the second shear nails are obliquely arranged with the stiffening plates, and the third shear nails are obliquely arranged with the tower wall embedded steel plates 301.
In an alternative embodiment of the present invention, two steel corbels are provided on the inner side of the tower wall pre-buried steel plate 301, and the two steel corbels are symmetrically distributed along the vertical center line of the tower wall pre-buried steel plate 301. The steel corbels comprise webs 303, a first top plate 306, a first bottom plate 302 and a second stiffening plate 305, wherein the webs 303 are vertically arranged and perpendicular to the tower wall embedded steel plates 301, the webs 303 are fixedly connected with the tower wall embedded steel plates 301, and edges of the webs 303 are welded with the tower wall embedded steel plates 301; the first top plate 306 is fixedly arranged at the top of the web 303, a base plate 304 is arranged on the surface of the first top plate, the base plate 304 is a polytetrafluoroethylene plate, and the steel anchor beam is supported on the polytetrafluoroethylene plate; the first bottom plate 302 is fixedly arranged at the bottom of the web 303; the second stiffening plates 305 are fixedly arranged on two sides of the web 303, the upper ends of the second stiffening plates are fixedly connected with the lower surface of the first top plate 306, and the side edges of the second stiffening plates are fixedly connected with the side surfaces of the web 303, so that the strength and the stability of the steel corbels are improved. The polytetrafluoroethylene plate has the excellent characteristics of high and low temperature resistance (-192 ℃ to 260 ℃), corrosion resistance (strong acid, strong alkali, aqua regia and the like), weather resistance, high insulation, high lubrication, non-adhesion, no toxicity and the like. The polytetrafluoroethylene plate can reduce the possibility of corrosion at the joint of the steel anchor beam and the steel corbel, and improves the overall stability of the anchoring structure 3.
In an alternative embodiment of the present invention, the stiffening plate includes an upper stiffening plate 307 and a lower stiffening plate 308, the upper stiffening plate 307 corresponds to the shape, size, height of the first top plate 306; the shape, the size and the height of the lower reinforcing plate 308 correspond to those of the first bottom plate 302, so that a group of upper reinforcing plates 307 and lower reinforcing plates 308 are arranged on the other side of the tower wall embedded steel plate 301 corresponding to each steel bracket, and the reinforcing plates can reinforce the tower wall embedded steel plate 301 and the steel brackets, so that cracking of the connection part of the steel brackets and the tower wall embedded steel plate 301 due to overweight stress is prevented.
In an alternative embodiment of the present invention, the first stiffener 309 is divided into an upper section and a lower section; the upper section of the first stiffening plate 309 is positioned at the upper part of the upper stiffening plate 307, and the upper and lower ends of the upper section are respectively flush with the upper end of the tower wall embedded steel plate 301 and the upper end surface of the first stiffening plate 309;
the lower section of the first stiffener 309 is located between the upper stiffener 307 and the lower stiffener 308.
Since the upper stiffener 307 and the lower stiffener 308 are respectively the same as the steel corbels in height, and the lower section of the first stiffener 309 has a connection supporting function on the upper stiffener 307 and the lower stiffener 308, the first stiffener 309 forms an i-shaped structure with the upper stiffener 307 and the lower stiffener 308, which corresponds to the steel corbels.
In an alternative embodiment of the invention, the steel anchor beam is a box structure comprising: a second bottom plate 312, a side pulling plate 314 unit, a bearing plate assembly and a spacer 313. The two side pulling plates 314 are symmetrically disposed along the width direction of the second bottom plate 312. Two sides of the second bottom plate 312 in the length direction are respectively provided with a bearing plate assembly, and the bearing plate assemblies are positioned at the inner sides of the two side pulling plate 314 units. The partition 313 is located at an upper portion of the second bottom plate 312 and between the two side pulling plate 314 units for supporting the side pulling plate 314 units.
The second bottom plate 312 is rectangular, and a first central hole is formed in the second bottom plate 312, and the first central hole is a rectangular hole.
The side pulling plate 314 unit comprises a side pulling plate 314 and a third stiffening plate, wherein the third stiffening plate is fixedly arranged on the outer side surface of the side pulling plate 314, and the third stiffening plate is mutually perpendicular to the side pulling plate 314; the third stiffening plate comprises a transverse stiffening plate 315 and a vertical stiffening plate 316, and the vertical stiffening plate 316 is arranged on the upper side and the lower side of the transverse stiffening plate 315; preferably, 3 vertical stiffening plates 316 are provided at both ends of the upper side of the transverse stiffening plate 315 in the longitudinal direction of the side pulling plate 314, and correspond to the vertical stiffening plates 316 at the lower side of the corresponding transverse stiffening plate 315.
The two sides of the partition 313 are respectively in tight fit with the inner side surfaces of the two side pull plates 314. The partition 313 is provided with a second central hole, which is a circular hole. The separators 313 have four, two end separators 313 and two inner separators 313. Two end partition plates 313 are respectively arranged at two ends of the second bottom plate 312 in the length direction, two inner partition plates 313 are arranged between the two bearing plate assemblies, and the two inner partition plates 313 are positioned at two sides of the first center hole of the second bottom plate 312.
In this embodiment, the pressure bearing plate assembly includes a pressure bearing member 317 and an anchor backing plate 311, the pressure bearing member 317 is a square box body formed by welding steel plates, the size of the square box body is adapted to the space between two side pull plates 314, hinge shafts corresponding to the hinged side pull plates 314 extend out of two sides of the pressure bearing member 317, two ends of the pressure bearing member 317 are provided with perforations corresponding to the anchor tubes 310, and the anchor backing plate 311 is arranged on the upper end surface of the pressure bearing member 317 far away from the anchor tubes 310; after the steel anchor beam and the steel corbel are hoisted to the tower column 1, the steel corbel is poured into a hollow cable tower of the tower column 1, an adjusting hole corresponding to the anchor tube 310 is reserved on the outer wall of the tower column 1, the diameter of the adjusting hole is larger than the outer diameter of the anchor tube 310, and one end of the anchor tube 310 corresponding to the pressure-bearing member 317 is welded and fixed with the pressure-bearing member 317. In this embodiment, at least the partition plates 313 at two ends of the steel anchor beam are also provided with anchor pipe 310 holes, and the diameters of the anchor pipe 310 holes on the partition plates 313 and the tower wall embedded steel plates 301 are larger than those of the anchor pipe 310, so that the anchor pipe 310 can be adjusted in angle, and preferably, the anchor pipe 310 holes are waist-shaped holes extending longitudinally.
The anchor pipe 310 is driven to rotate by the pressure-bearing member 317 by applying a preload tension to the stay cable 2, thereby precisely adjusting the angle of the anchor pipe 310, and then the pressure-bearing member 317 is welded to the two side pull plates 314. The anchor backing plate 311 is a main bearing member, the side pulling plates 314 are main bearing members, the thickness of the third stiffening plate outside the side pulling plates 314 is 16-20 mm, and the thickness of the partition 313 in the middle of the side pulling plates 314 is 16mm.
The invention also provides a construction method of the road-railway dual-purpose river-crossing A-shaped stay cable anchoring structure, which comprises the following steps:
s1, respectively assembling a steel anchor beam and a steel bracket assembly, and temporarily reinforcing a matching member for an installation tool;
s2, machining the surface of a backing plate 304 arranged between the steel anchor beam and the steel corbel so that the friction coefficient of the sliding end of the steel anchor beam is less than or equal to 0.05;
s3, integrally assembling the steel anchor beam and the steel bracket assembly in a factory; the side span end steel anchor beam and the steel corbel are connected with high-strength bolts to apply pretightening force to form a consolidation state, the main span side steel anchor beam and the steel corbel are temporarily consolidated by the high-strength bolts, the nut end of the high-strength bolts is downward, the assembly fixture is used for temporarily reinforcing the matching member, and the whole structure can be manufactured;
s4, hoisting the steel anchor beam and the steel corbel integrally, and then pouring concrete of the tower column 1; before the corresponding stay cable 2 is tensioned, releasing a high-strength bolt temporarily connected to the main span side until the pretightening force is 0, ensuring that the nut and the washer do not fall off, and dismantling a temporary reinforcing matching member for the tool;
and S5, after the full-bridge stay cable 2 is tensioned, tightening high-strength bolts between the main span side steel anchor beam and the steel corbel, and completely locking the relative sliding between the steel anchor beam and the steel corbel.
In this embodiment, when the bearing member 317 is hinged to the side pulling plate 314 through a hinge shaft, an adjusting hole corresponding to the anchor tube 310 is reserved on the outer wall of the tower column 1 during pouring of the steel bracket, when the stay cable 2 is tensioned, a certain pre-load tension force is initially loaded, the pre-load tension force should not be greater than one third of the pre-load tension force, the bearing member 317 drives the anchor tube 310 to rotate through applying the pre-load tension force to the stay cable 2, so that the angle of the anchor tube 310 is accurate, the error of guiding precision of the anchor tube 310 caused by measurement or construction precision is avoided, then the bearing member 317 and the two side pulling plates 314 are welded and fixed, in this embodiment, one end of the bearing member 317 corresponding to the anchor tube 310 is welded and fixed with the bearing member 317, and the anchor tube 310 hole on the pre-buried steel plate 301 of the tower wall is a waist-shaped hole extending longitudinally, so that the anchor tube 310 can be subjected to angle adjustment.
In an alternative embodiment, in step S1, the assembly steps of the steel corbel assembly are:
s100, assembling steel corbels: first, horizontally placing a first top plate 306, and marking a longitudinal and transverse datum line; sequentially drawing position lines of the web 303 and the second stiffening plate 305 according to the longitudinal and transverse reference lines, and sequentially assembling the web 303 and the second stiffening plate 305 according to the position lines; a position line of the web 303 is then drawn on the first base plate 302, and the web 303 and the first base plate 302 are assembled together according to the position line. S101, splicing embedded steel plate single elements: horizontally arranging a tower wall embedded steel plate 301 on a scribing platform, and scribing longitudinal and transverse datum lines on the tower wall embedded steel plate 301; marking out the first stiffening plate 309 on the embedded side and the position line of the stiffening plate according to the longitudinal and transverse datum lines; the first stiffener 309 and the stiffener are assembled by site lines. In step S101, before assembling, the shear nails need to be welded Yu Dabi to the pre-embedded steel plate 301, the first stiffening plate 309 and the stiffening plate in advance, and part of the shear nails affecting the weld joint can be repair welded after the assembly of the single elements is completed. The shear pin includes: the first shear pins are positioned on the first stiffening plates 309 and are perpendicular to each other; the second shear nails are positioned on the reinforcing plate and are perpendicular to each other; and the third shear pin is embedded in the steel plate 301 at a position Yu Dabi, and the third shear pin are perpendicular to each other. S102, marking a locating line of a steel bracket on the tower wall embedded steel plate 301 and a projection line of the anchor pipe 310 on the tower wall embedded steel plate 301. In step S102, the deviation of the external dimensions of the tower wall embedded steel plate 301 is first retested, the longitudinal and transverse baselines are corrected during scribing, and then the assembly position of the top surface of the first top plate 306 is found out as the assembly reference by taking the longitudinal and transverse baselines as the reference. S103, assembling the steel corbels by adopting a laser measuring instrument, welding penetration weld joints of the steel corbels and the tower wall embedded steel plates 301, and correcting welding deformation by adopting post-welding flame. In step S103, the web 303, the first top plate 306, and the first bottom plate 302 of the steel corbel are welded to the tower wall embedded steel plate 301, respectively. And S104, vertically arranging the tower wall embedded steel plate 301 on a steel platform, installing and welding the anchor pipe 310 by matching projection lines of the anchor pipe 310 with the projection ground sample.
In an alternative embodiment, in step S1, the assembly steps of the steel anchor beam are: s1001, assembling and positioning of the steel anchor beam diaphragm 313: the second bottom plate 312 is laid on the platform, a longitudinal base line of the second bottom plate 312 is drawn at the center of the width direction of the second bottom plate 312, a transverse base line of the second bottom plate 312 and an assembling position line of the inner partition plate 313 are drawn at the center of the length direction of the second bottom plate 312, and the partition plate 313 is assembled according to the position line; s1002, steel anchor beam groove type assembly: two side pulling plates 314 are hung into a jig frame, the side pulling plates 314 are tightly propped against the partition plate 313 by using a jack, the jacking pick is matched with the side pulling plates 314 to finely adjust the transverse position, and meanwhile, the end partition plate 313 is used as an inner template to control the port size of the steel anchor beam; after the positioning of the groove type is finished, firstly, assembling and welding the groove type, then fixing the groove type by adopting positioning welding, and polishing uniformly and smoothly after welding the welding seam inside the groove type; s1003, assembling a bearing plate assembly: the bearing plate assembly is hung into the groove to be assembled according to the base line position, and is positioned on the side pull plate 314 after being checked to be qualified. S1004, anchor pad 311 is mounted: the anchor backing plates 311 are respectively assembled by matching with a laser measuring instrument, and the welding pressure bearing member 317 and the anchor backing plates 311 penetrate through welding seams. And after the steel anchor beam main box body is finished, parts such as a limiting plate, a beam base steel plate, a base stainless steel plate and the like are welded, and welding deformation is corrected by flame after welding. S1005, second base plate 312 surface treatment: in order to control the planeness of the friction surface of the second bottom plate 312 of the steel anchor beam, the combination surface of the steel anchor beam and the steel corbel meets the design and manufacturing rule requirements, and the friction surface of the second bottom plate 312 of the steel anchor beam is subjected to machining and surface milling treatment. S1006, steel anchor beam hole making: and turning the steel anchor beam into a scribing platform, drawing a longitudinal datum line and a transverse datum line on the center line of the second bottom plate 312 of the box body with the second bottom plate 312 facing upwards, drawing a hole group positioning line at two ends of the steel anchor beam and a hole opposite line of a side pulling plate 314 unit by the longitudinal datum line, adopting a magnetic drill to drill a molding hole in a matching manner after the steel anchor beam is checked to be qualified, and finishing the processing and the manufacturing of the steel anchor beam after the checking is qualified. S1007, checking and accepting finished products: in order to ensure that the appearance and the assembly size of the steel anchor beam meet the inspection requirement, the precision requirement is required to be formulated for the relevant sizes of the semi-finished product and the finished product of the steel anchor beam, and the inspection content mainly comprises the items of component marking deviation, structural installation perpendicularity, straightness deviation, axial angle deviation of an anchor box inhaul cable, axial deviation of a hole group of a second bottom plate 312 of the steel anchor beam and the inhaul cable, overall structural size deviation and the like. It is to be understood that the above description is exemplary only and that the embodiments of the present application are not limited thereto.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The river-crossing A-type stay cable anchoring structure for highway and railway is characterized by comprising a steel anchor beam and steel bracket assemblies, wherein two ends of the steel anchor beam are correspondingly supported between the two oppositely arranged steel bracket assemblies;
the steel bracket assembly comprises a pre-buried steel plate unit and a steel bracket;
the pre-buried steel sheet unit includes:
the tower wall embedded steel plate is vertically arranged, and the steel corbel is fixedly arranged at the lower part of the inner side of the tower wall embedded steel plate;
the first stiffening plate is fixedly arranged on the outer side of the tower wall embedded steel plate, and a first shear nail is arranged on the first stiffening plate;
the reinforcing plate is horizontally and fixedly arranged on the outer side of the tower wall embedded steel plate and is distributed opposite to the steel corbels, and a second shear pin is arranged on the reinforcing plate;
the third shear pin is fixedly arranged on the outer side surface of the tower wall embedded steel plate;
the anchor pipe is provided with an anchor pipe hole corresponding to the anchor pipe on the tower wall embedded steel plate, one end of the anchor pipe penetrates through the anchor pipe hole and then stretches out of the outer side of the tower wall embedded steel plate, and the other end of the anchor pipe points to an anchor backing plate on the steel anchor beam;
the steel anchor beam is box structure, includes: the side pulling plate unit is connected with the side pulling plate unit;
the two side pulling plate units are symmetrically arranged along the width direction of the second bottom plate, two sides of the length direction of the second bottom plate are respectively provided with a bearing plate component, and the bearing plate components are positioned at the inner sides of the two side pulling plate units; the partition plate is positioned at the upper part of the second bottom plate and between the two side pulling plate units and is used for supporting the side pulling plate units;
the second bottom plate is rectangular, a first central hole is formed in the second bottom plate, and the first central hole is a rectangular hole;
the side pulling plate unit comprises a side pulling plate and a third stiffening plate, the third stiffening plate is fixedly arranged on the outer side surface of the side pulling plate, and the third stiffening plate is mutually perpendicular to the side pulling plate; the third stiffening plate comprises a transverse stiffening plate and a vertical stiffening plate, and the vertical stiffening plates are arranged on the upper side and the lower side of the transverse stiffening plate;
the number of the vertical stiffening plates at the upper side of the transverse stiffening plate is 3 along the two ends of the length direction of the side pulling plate, and the vertical stiffening plates correspond to the vertical stiffening plates at the lower side of the corresponding transverse stiffening plate;
the two sides of the partition board are respectively in tight fit with the inner side surfaces of the two side pull plates; the partition plate is provided with a second central hole which is a round hole;
the two end partition boards are respectively arranged at the two ends of the second bottom board in the length direction, two inner partition boards are arranged between the two bearing board assemblies, and the two inner partition boards are positioned at the two sides of the first central hole of the second bottom board;
the bearing plate assembly comprises a bearing part and an anchor backing plate, the bearing part is a square box body formed by welding steel plates, the size of the square box body is matched with the distance between the two side pull plates, hinge shafts corresponding to the hinged side pull plates extend out of two sides of the bearing part, through holes corresponding to anchor pipes are formed in two ends of the bearing part, and the anchor backing plate is arranged on the upper end face of the bearing part far away from the anchor pipes;
after the steel anchor beam and the steel corbel are hoisted to the tower column, pouring the steel corbel into a hollow cable tower of the tower column, reserving an adjusting hole corresponding to the anchor pipe on the outer wall of the tower column, wherein the diameter of the adjusting hole is larger than the outer diameter of the anchor pipe, and welding and fixing one end of the anchor pipe corresponding to the pressure-bearing piece;
and at least the baffle plates at two ends of the steel anchor beam are also provided with anchor pipe holes, the diameters of the anchor pipe holes on the baffle plates and the tower wall embedded steel plates are larger than the diameters of the anchor pipe, so that the anchor pipe can be subjected to angle adjustment, the pressure-bearing piece is driven to rotate by applying a pre-load tension force to the stay cable, the angle of the anchor pipe is accurate, and then the pressure-bearing piece is welded and fixed with the two side pull plates.
2. The highway and railway dual-purpose river-crossing a-type stay cable anchoring structure according to claim 1, wherein two steel corbels are symmetrically distributed along the vertical center line of the tower wall embedded steel plate;
the steel corbel includes:
the web plate is vertically fixed on one side of the tower wall embedded steel plate corresponding to the steel anchor beam;
the first top plate is horizontally and fixedly arranged at the top of the web plate and is correspondingly connected with the tower wall embedded steel plate, a base plate is arranged on the surface of the first top plate, and the steel anchor beam is supported on the base plate;
the first bottom plate is horizontally and fixedly arranged at the bottom of the web plate and is correspondingly connected with the tower wall embedded steel plate;
and the second stiffening plates are vertically and fixedly arranged on two sides of the web plate, the upper ends of the second stiffening plates are fixedly connected with the lower surface of the first top plate, and the side edges of the second stiffening plates are fixedly connected with the side surfaces of the web plate.
3. The highway and railway dual-purpose river-crossing a-type stay cable anchoring structure according to claim 2, wherein the reinforcing plates comprise an upper reinforcing plate and a lower reinforcing plate, and the upper reinforcing plate corresponds to the first top plate in shape, size and height; the lower reinforcing plate corresponds to the first bottom plate in shape, size and height.
4. The highway and railway dual-purpose river-crossing a-type stay cable anchoring structure according to claim 3, wherein the first stiffening plate is divided into an upper section and a lower section;
the upper section of the first stiffening plate is positioned at the upper part of the upper stiffening plate, and the upper end and the lower end of the upper section of the first stiffening plate are respectively flush with the upper end of the tower wall embedded steel plate and the upper end surface of the first stiffening plate;
the first stiffening plate lower section is located between the upper stiffening plate and the lower stiffening plate.
5. A construction method of a road-railway dual-purpose river-crossing a-type stay cable anchoring structure as defined in any one of claims 1 to 4, comprising the following steps:
s1, respectively assembling a steel anchor beam and a steel bracket assembly, and temporarily reinforcing a matching member for an installation tool;
s2, machining the surface of a backing plate arranged between the steel anchor beam and the steel bracket so that the friction coefficient of the backing plate between the steel anchor beam and the bracket is less than or equal to 0.05;
s3, integrally assembling the steel anchor beam and the steel corbel assembly, applying a pretightening force to the steel anchor beam and the steel corbel connection high-strength bolts corresponding to the side span ends to form a consolidation state, temporarily consolidating the steel anchor beam and the steel corbel corresponding to the main span side by the high-strength bolts, and forming an integral structure by utilizing temporary reinforcement matching members;
s4, hoisting the steel anchor beams and the steel corbels integrally, and pouring concrete of the corresponding section tower columns according to the construction progress; before the corresponding stay cable is tensioned, releasing the pre-tightening force of the temporarily consolidated high-strength bolt on the main span side steel anchor beam, ensuring that the nut and the washer do not fall off, and dismantling the temporarily reinforced matching member for the assembly fixture;
s5, after the full-bridge stay cable is tensioned, tightening high-strength bolts between the main span side steel anchor beam and the steel corbel, and completely locking relative sliding between the steel anchor beam and the steel corbel;
when the support is hinged with the side pull plate through the hinge shaft, an adjusting hole corresponding to the anchor pipe is reserved on the outer wall of the tower column when the steel corbel is poured, when the stay cable is tensioned, a certain preload tension is initially loaded, the preload tension is not larger than one third of the preset tension, the support is enabled to drive the anchor pipe to rotate through applying the preload tension to the stay cable, therefore, the angle of the anchor pipe is accurate, and then the support and the two side pull plates are welded and fixed.
6. The construction method of a dual-purpose river-crossing a-type stay cable anchoring structure according to claim 5, wherein in step S1, the assembling steps of the steel corbel assembly are as follows:
s101, drawing a longitudinal and transverse datum line on the outer side of a tower wall embedded steel plate, drawing position lines of a first stiffening plate and a stiffening plate on the embedded side according to the longitudinal and transverse datum line, and assembling the first stiffening plate and the stiffening plate according to the position lines;
s102, marking a positioning line of a steel bracket and a projection line of an anchor pipe on the tower wall embedded steel plate on the inner side of the tower wall embedded steel plate;
s103, adopting a laser measuring instrument to cooperatively assemble the steel corbels, welding penetration weld joints of the steel corbels and the tower wall embedded steel plates, and then adopting post-welding flame to correct welding deformation;
s104, vertically arranging the tower wall embedded steel plate on a steel platform, and installing and welding the anchor pipe through the cooperation of the anchor pipe projection line and the projection ground sample.
7. The construction method of a dual-purpose river-crossing a-type stay cable anchoring structure according to claim 6, wherein in the step S1, the step of assembling steel corbels comprises: firstly, horizontally placing a first top plate, and drawing a longitudinal and transverse datum line; sequentially drawing position lines of the web plate and the second stiffening plate according to the longitudinal and transverse datum lines, and sequentially assembling the web plate and the second stiffening plate according to the position lines; and then scribing a position line of the web on the first bottom plate, and assembling the web and the first bottom plate together according to the position line.
8. The construction method of a dual-purpose river-crossing a-type stay cable anchoring structure for roads and railways according to claim 7, wherein in step S102, firstly, the deviation of the external dimensions of the embedded steel plates of the tower wall is retested, the longitudinal and transverse baselines are corrected during scribing, and then the longitudinal and transverse baselines are used as the benchmark, and the assembling position of the top surface of the first top plate is found out as the assembling benchmark.
9. The construction method of a dual-purpose river-crossing a-type stay cable anchoring structure for roads and railings according to claim 8, wherein in step S103, the web plate, the first top plate and the first bottom plate of the steel corbel are welded with the tower wall embedded steel plate respectively.
10. The construction method of the river-crossing a-type stay cable anchoring structure for both roads and railways according to claim 5, wherein in the step S101, before assembling, shear nails are welded Yu Dabi pre-embedded steel plates, first stiffening plates and reinforcing plates in advance, and after assembling of the single elements, the shear nails affecting the weld joint are subjected to repair welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210934626.4A CN115341467B (en) | 2022-08-04 | 2022-08-04 | Highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210934626.4A CN115341467B (en) | 2022-08-04 | 2022-08-04 | Highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure and construction method thereof |
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| CN115341467A CN115341467A (en) | 2022-11-15 |
| CN115341467B true CN115341467B (en) | 2023-06-02 |
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| JP5894039B2 (en) * | 2012-08-30 | 2016-03-23 | 三井住友建設株式会社 | Anchor cable fixing structure |
| CN108252215A (en) * | 2018-03-13 | 2018-07-06 | 中交公路规划设计院有限公司 | Connection structure of the board-like Suo-tower of trepanning and preparation method thereof |
| CN108978470B (en) * | 2018-06-05 | 2020-01-21 | 中铁大桥勘测设计院集团有限公司 | Cable-stayed bridge cable tower steel structure anchoring structure |
| CN210420862U (en) * | 2019-03-22 | 2020-04-28 | 山东省交通规划设计院 | Stay cable tower end anchoring device |
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