CN115341467A - Highway-railway dual-purpose river-crossing A-type stay cable anchoring structure and construction method thereof - Google Patents
Highway-railway dual-purpose river-crossing A-type stay cable anchoring structure and construction method thereof Download PDFInfo
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- CN115341467A CN115341467A CN202210934626.4A CN202210934626A CN115341467A CN 115341467 A CN115341467 A CN 115341467A CN 202210934626 A CN202210934626 A CN 202210934626A CN 115341467 A CN115341467 A CN 115341467A
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- 238000004873 anchoring Methods 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 273
- 239000010959 steel Substances 0.000 claims abstract description 273
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 40
- 238000003466 welding Methods 0.000 claims description 22
- 238000007596 consolidation process Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 3
- 239000002585 base Substances 0.000 description 20
- 238000005192 partition Methods 0.000 description 15
- 239000003351 stiffener Substances 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 230000036316 preload Effects 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- 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
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Abstract
The invention provides a highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure and a construction method thereof, wherein the highway-railway dual-purpose river-crossing A-shaped stay cable anchoring structure comprises a steel anchor beam and steel corbel components, wherein two ends of the steel anchor beam are correspondingly supported between the two oppositely-arranged steel corbel components; 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; the reinforcing plate is symmetrical to the steel corbel, so that the phenomenon that the joint is cracked due to the fact that the stress is too heavy at the joint of the steel corbel and the embedded steel plate of the tower wall can be avoided. The tower wall embedded steel plate can be connected with the tower column through the shear nails and also can be connected with the tower column through the first stiffening plates and the reinforcing plates; in addition, the shear nails are arranged on the tower wall embedded steel plate, the first stiffening plate and the reinforcing plate, and the angles of the first shear nail, the second shear nail and the third shear nail are different, so that the firmness of connection between the tower wall embedded steel plate 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-railway dual-purpose river-crossing A-type stay cable anchoring structure and a construction method thereof.
Background
The cable-stayed bridge has the advantages of large span, high rigidity, light structural weight, low manufacturing cost and the like, and is widely applied to large-span bridge engineering. 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. Each bracket top plate directly supports a steel box girder, the steel bracket assembly is a supporting structure of the steel anchor girder, and the installation precision and the structural fastness of the steel bracket assembly directly correspond to 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 is low in installation precision and is not easy to assemble with the steel anchor beam; 2. the steel bracket component has low strength and poor structural stability, has deformation and bending and has potential safety hazard.
Therefore, 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 purpose, the invention provides the following technical scheme:
a river-crossing A-type stay cable anchoring structure for highway and railway comprises a steel anchor beam and steel bracket components, wherein two ends of the steel anchor beam are correspondingly supported between the two steel bracket components which are oppositely arranged;
the steel bracket assembly comprises an embedded steel plate unit and a steel bracket;
the pre-buried steel plate unit comprises:
the tower wall embedded steel plate is vertically arranged, and the lower part of the inner side of the tower wall embedded steel plate is fixedly provided with the steel corbel;
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 embedded steel plate of the tower wall and distributed opposite to the steel bracket, and a second shear nail is arranged on the reinforcing plate;
the third shear nails are fixedly arranged on the outer side surfaces of the tower wall embedded steel plates;
the anchor pipe is provided with an anchor pipe hole corresponding to the anchor pipe, one end of the anchor pipe penetrates through the anchor pipe hole and then extends 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 brackets are symmetrically distributed along the vertical center line of the embedded steel plate on the tower wall;
the steel corbel comprises:
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 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 shape, size and height of the upper reinforcing plate correspond to those 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 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 lower section of the first stiffening plate is positioned between the upper stiffening plate and the lower stiffening plate.
A construction method of a highway-railway dual-purpose river-crossing A-type stay cable anchoring structure comprises the following steps:
s1, respectively assembling a steel anchor beam and a steel corbel assembly, and installing a temporary reinforcing matching member for a tool;
s2, machining the surface of a base plate arranged between the steel anchor beam and the steel bracket to enable the friction coefficient of the base plate between the steel anchor beam and the bracket to be less than or equal to 0.05;
s3, integrally assembling the steel anchor beam and the steel bracket assembly, connecting the steel anchor beam and the steel bracket corresponding to the side span end with a high-strength bolt to apply pre-tightening force to form a consolidation state, temporarily consolidating the steel anchor beam and the steel bracket corresponding to the main span side with the high-strength bolt, and forming an integral structure by using a temporary consolidation matching component;
s4, integrally hoisting the steel anchor beam and the steel corbel, and pouring concrete of the corresponding section of tower column according to the construction progress; before tensioning the corresponding stay cable, releasing the pre-tightening force of the high-strength bolt temporarily solidified on the main span side steel anchor beam, ensuring that a nut and a gasket do not fall off, and dismantling a temporary reinforcing matching component for an assembly tool;
and S5, after the full-bridge stay cable is tensioned, screwing the high-strength bolt between the main span side steel anchor beam and the steel bracket, and completely locking the relative sliding between the steel anchor beam and the steel bracket.
Preferably, in the step S1, the assembling step of the steel corbel assembly is:
s101, drawing longitudinal and transverse datum lines on the outer sides of pre-buried steel plates of a tower wall, drawing position lines of first stiffening plates and stiffening plates on pre-buried sides according to the longitudinal and transverse datum lines, and assembling the first stiffening plates and the stiffening plates according to the position lines;
s102, marking out a positioning line of a steel corbel 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, assembling the steel bracket by adopting a laser measuring instrument in a matching manner, welding a penetration weld joint of the steel bracket and the pre-buried steel plate of the tower wall, and correcting welding deformation by adopting post-welding flame;
and S104, vertically arranging the tower wall embedded steel plate on a steel platform, and installing and welding an anchor pipe in a matching way through an anchor pipe projection line and a projection ground sample.
Preferably, in the step S1, the step of assembling the steel corbel includes: firstly, horizontally placing a first top plate, and marking out a longitudinal and transverse datum line; sequentially marking out position lines of the web plate and the second stiffening plate according to the longitudinal and transverse reference lines, and sequentially assembling the web plate and the second stiffening plate according to the position lines; the web is then scribed on the first base plate for a position line according to which the web and the first base plate are assembled together.
Preferably, in step S102, firstly, the deviation of the outer dimensions of the tower wall embedded steel plate is retested, the longitudinal and transverse base lines are corrected during scribing, and then the assembly position of the top surface of the first top plate is found as an assembly reference by using the longitudinal and transverse base lines as a reference.
Preferably, in step S103, the web, the first top plate and the first bottom plate of the steel corbel are respectively welded to the tower wall embedded steel plate.
Preferably, in step S101, before assembly, the shear pins are welded to the tower wall embedded steel plate, the first stiffening plate and the stiffening plate in advance, and the shear pins affecting the weld joint may be repaired and welded after the assembly of the single elements is completed.
Has the advantages 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; the reinforcing plate is symmetrical to the steel corbel, so that the phenomenon that the joint is cracked due to the fact that the stress is too heavy at the joint of the steel corbel and the embedded steel plate of the tower wall can be avoided. The tower wall embedded steel plate can be connected with the tower column through the shear nails and also can be connected with the tower column through the first stiffening plates and the reinforcing plates; in addition, the shear nails are arranged on the tower wall embedded steel plate, the first stiffening plate and the reinforcing plate, and the angles of the first shear nail, the second shear nail and the third shear nail are different, so that the firmness of connection between the tower wall embedded steel plate and the tower column is greatly improved, and the shear strength is further improved.
In conclusion, the steel bracket component is stable in structure, safe and reliable, and the overall stability and the safety and the reliability of the stay cable anchoring structure are greatly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic view illustrating the installation of a stay cable anchoring structure according to 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 structural view of a steel anchor beam according to the present invention;
FIG. 4 is a schematic structural view of a steel corbel assembly according to the present invention;
fig. 5 is an assembly schematic diagram of the tower wall embedded steel plates of the steel corbel assembly.
In the figure: 1. a tower column; 2. a stay cable; 3. an anchoring device; 301. pre-burying a steel plate on the tower wall; 302. a first base plate; 303. a web; 304. a base plate; 305. a second stiffener plate; 306. a first top plate; 307. an upper stiffening plate; 308. a lower stiffening plate; 309. a first stiffener plate; 310. an anchor pipe; 311. an anchor backing plate; 312. a second base plate; 313. a partition plate; 314. a side pulling plate; 315. a transverse stiffening plate; 316. erecting a stiffening plate; 317. a pressure-bearing member.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are 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 "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The embodiment of the stay cable anchoring structure of the invention is shown in fig. 1-5, and the anchor structure 3 comprises a steel anchor beam and steel bracket components, wherein a group of opposite steel bracket components are positioned at two opposite sides in a hollow cable tower, two ends of the steel anchor beam are supported on a pair of steel bracket components, and the steel bracket components comprise embedded steel plate units and steel brackets. The steel anchor beam is connected with the steel bracket through a bolt. The embedded steel plate unit comprises a tower wall embedded steel plate 301, a first stiffening plate 309, a third shear nail, an anchor pipe 310 and a reinforcing plate: the tower wall embedded steel plate 301 is vertically arranged and used for being connected with the tower column 1, a steel corbel is fixedly arranged at the lower part of the inner side of the tower wall embedded steel plate 301, and an anchor pipe 310 hole is 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 backing plate 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 a first shear nail is arranged on the first stiffening plate 309; the reinforcing plate is horizontally and 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 nail is arranged on the reinforcing plate; and the third shear nails are fixedly arranged on the outer side surface of the tower wall embedded steel plate 301. The tower wall embedded steel plate 301, the first stiffening plate 309, the reinforcing plate, the first shear nail, the second shear nail and the third shear nail of the anchoring structure 3 of the stay cable 2 are all arranged inside the concrete of the tower column 1 in a pouring mode, and the tower wall embedded steel plate 301 and the tower column 1 are strong in connection firmness; the stiffening plate distributes with the steel corbel relatively, can prevent that the steel corbel from leading to the fracture because of the atress is overweight with the pre-buried steel sheet 301's of tower wall junction, has promoted safety and stability. 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, safety and reliability of the anchoring structure 3.
In an alternative embodiment of the present invention, the first shear pin is perpendicular to the first stiffening plate 309, the second shear pin is perpendicular to the stiffening plate, and the third shear pin is perpendicular to the tower wall embedded steel plate 301. Or the first shear nails and the first stiffening plates 309 are obliquely arranged, the second shear nails and the stiffening plates are obliquely arranged, and the third shear nails and the tower wall embedded steel plates 301 are obliquely arranged.
In an optional embodiment of the present invention, two steel brackets are disposed on the inner side of the tower wall embedded steel plate 301, and the two steel brackets are symmetrically distributed along the vertical center line of the tower wall embedded steel plate 301. The steel corbel comprises a web plate 303, a first top plate 306, a first bottom plate 302 and a second stiffening plate 305, wherein the web plate 303 is vertically arranged and is perpendicular to the tower wall embedded steel plate 301, the web plate 303 is fixedly connected with the tower wall embedded steel plate 301, and the edge of the web plate 303 is welded with the tower wall embedded steel plate 301; the first top plate 306 is fixedly arranged at the top of the web plate 303, the surface of the first top plate is provided with a backing plate 304, the backing 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 plate 303; the second stiffening plates 305 are fixedly arranged on two sides of the web plate 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 plate 303 and used for improving the strength and stability of the steel corbel. The polytetrafluoroethylene plate has the excellent characteristics of high and low temperature resistance (-192-260 ℃), corrosion resistance (strong acid, strong alkali, aqua regia and the like), weather resistance, high insulation, high lubrication, no adhesion, no toxicity and the like. The possibility of corrosion at the joint of the steel anchor beam and the steel bracket can be reduced by using the polytetrafluoroethylene plate, and the overall stability of the anchoring structure 3 is improved.
In an alternative embodiment of the present invention, the reinforcing plates include an upper reinforcing plate 307 and a lower reinforcing plate 308, and the shape, size and height of the upper reinforcing plate 307 and the first top plate 306 correspond to each other; the shape, size and height of the lower reinforcing plate 308 correspond to those of the first base 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, the reinforcing plates can reinforce the tower wall embedded steel plate 301 and the steel brackets, and the joint of the steel brackets and the tower wall embedded steel plate 301 is prevented from cracking due to excessive stress.
In an alternative embodiment of the present invention, the first stiffener plate 309 is divided into an upper section and a lower section; the upper section of the first stiffening plate 309 is located at the upper part of the upper stiffening plate 307, and the upper end and the lower end of the first stiffening plate 309 are respectively flush with the upper end of the tower wall embedded steel plate 301 and the upper end face of the first stiffening plate 309;
the lower section of the first stiffener plate 309 is located between the upper stiffener plate 307 and the lower stiffener plate 308.
Because the upper stiffening plate 307 and the lower stiffening plate 308 are respectively as high as the steel corbel, and the lower section of the first stiffening plate 309 has a connecting and supporting function on the upper stiffening plate 307 and the lower stiffening plate 308, the first stiffening plate 309, the upper stiffening plate 307 and the lower stiffening plate 308 form an i-shaped structure corresponding to the steel corbel.
In an alternative embodiment of the invention, the steel anchor beam is of box-type construction comprising: a second bottom plate 312, a side pull plate 314 unit, a pressure bearing plate assembly, and a partition 313. The two side pulling plate 314 units are symmetrically arranged along the width direction of the second base plate 312. Two sides of the second bottom plate 312 in the length direction are respectively provided with a pressure bearing plate assembly, and the pressure bearing plate assemblies are located at the inner sides of the two side pulling plates 314. The spacer 313 is located at the upper portion of the second base plate 312 and between the two side pull plate 314 units for supporting the side pull plate 314 units.
The second bottom plate 312 is rectangular, and a first center hole is formed in the second bottom plate 312, and the first center hole is a rectangular hole.
The side pulling plate 314 unit comprises a side pulling plate 314 and a third stiffening plate, the third stiffening plate is fixedly arranged on the outer side surface of the side pulling plate 314, and the third stiffening plate is vertical to the side pulling plate 314; the third stiffening plates comprise a horizontal stiffening plate 315 and vertical stiffening plates 316, and the vertical stiffening plates 316 are arranged on the upper side and the lower side of the horizontal stiffening plate 315; preferably, 3 vertical stiffening plates 316 on the upper side of the horizontal stiffening plates 315 are respectively disposed at two ends along the length direction of the side pulling plates 314, and correspond to the vertical stiffening plates 316 on the lower side of the corresponding horizontal stiffening plates 315.
Two sides of the partition 313 are respectively matched with the inner sides of the two side pulling plates 314 in a propping and tight way. The partition 313 is provided with a second central hole, which is a circular hole. The spacers 313 include four, two end spacers 313 and two inner spacers 313. Two ends of the second bottom plate 312 in the length direction are respectively provided with an end partition 313, two internal partitions 313 are arranged between the two pressure-bearing plate assemblies, and the two internal partitions 313 are positioned at two sides of the first central hole of the second bottom plate 312.
In this embodiment, the pressure-bearing plate assembly includes a pressure-bearing member 317 and an anchor plate 311, the pressure-bearing member 317 is a square box welded by steel plates, the size of the square box is matched with the distance between the two side pull plates 314, hinge shafts corresponding to the hinge side pull plates 314 extend out from both sides of the pressure-bearing member 317, through holes corresponding to the anchor pipes 310 are formed at both ends of the pressure-bearing member 317, and the anchor plate 311 is disposed on the upper end face of the pressure-bearing member 317 away from the anchor pipes 310; after the steel anchor beam and the steel corbel are hoisted to the tower column 1, the steel corbel is poured into the hollow cable tower of the tower column 1, an adjusting hole corresponding to the anchor pipe 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 pipe 310, and one end of the anchor pipe 310, corresponding to the pressure-bearing part 317, is welded and fixed with the pressure-bearing part 317. In this embodiment, at least the partition 313 at both ends of the steel anchor beam is also provided with anchor pipe 310 holes, and the diameter of the anchor pipe 310 holes on the partition 313 and the tower wall embedded steel plate 301 is larger than that of the anchor pipe 310, so that the anchor pipe 310 can be angularly adjusted, and preferably, the anchor pipe 310 holes are longitudinally extending kidney-shaped holes.
The bearing member 317 rotates the anchor pipe 310 by applying a pre-load tension to the stay cable 2, thereby precisely aligning the angle of the anchor pipe 310, and then the bearing member 317 is welded and fixed to the two side pulling plates 314. The anchor backing plate 311 is a main bearing member, the side pulling plate 314 is a main bearing member, the thickness of the third stiffening plate at the outer side of the side pulling plate 314 is 16-20 mm, and the thickness of the partition 313 between the two side pulling plates 314 is 16mm.
The invention also provides a construction method of the highway-railway dual-purpose river-crossing A-type stay cable anchoring structure, which comprises the following steps:
s1, respectively assembling a steel anchor beam and a steel corbel assembly, and installing a temporary reinforcing matching member for a tool;
s2, machining the surface of a base plate 304 arranged between the steel anchor beam and the steel corbel to enable the friction coefficient of the sliding end of the steel anchor beam to be less than or equal to 0.05;
s3, integrally assembling the steel anchor beam and the steel corbel component in a factory; the side span end steel anchor beam and the steel bracket are connected with the high-strength bolt to apply pretightening force to form a consolidation state, the main span side steel anchor beam and the steel bracket are temporarily consolidated by the high-strength bolt to ensure that the nut end of the high-strength bolt is downward, and the matching component is temporarily consolidated for assembling a tool, so that the side span end steel anchor beam and the steel bracket can leave a factory after forming an integral structure;
s4, integrally hoisting the steel anchor beam and the steel corbel, and then pouring concrete of the tower column 1; before tensioning the corresponding stay cable 2, releasing the high-strength bolt temporarily connected on the main span side until the pretightening force is 0, ensuring that the nut and the gasket do not fall off, and dismantling the temporary reinforcing matching member for the tool;
and S5, after the full-bridge stay cable 2 is tensioned, screwing the high-strength bolt between the main span side steel anchor beam and the steel bracket, and completely locking the relative sliding between the steel anchor beam and the steel bracket.
In this embodiment, the bearing member 317 is hinged to the side pulling plates 314 through the hinge shaft, an adjusting hole corresponding to the anchor pipe 310 is reserved in the outer wall of the tower column 1 during pouring of the steel corbel, when the stay cable 2 is tensioned, a certain pre-load tension force is initially loaded, the pre-load tension force is not greater than one third of the pre-set tension force, the bearing member 317 drives the anchor pipe 310 to rotate by applying the pre-load tension force to the stay cable 2, so that the angle of the anchor pipe 310 is accurate, and a guiding precision error of the anchor pipe 310 caused by measurement or construction precision is avoided, and then the bearing member 317 and the two side pulling plates 314 are welded and fixed, in this embodiment, one end of the anchor pipe 310 corresponding to the bearing member 317 is welded and fixed to the bearing member, and the anchor pipe 310 hole on the pre-embedded steel plate 301 of the tower wall is a longitudinally extending waist-shaped hole, so that the anchor pipe 310 can be adjusted in angle.
In an alternative embodiment, in step S1, the assembling step of the steel corbel assembly is:
s100, assembling the steel corbel: firstly, horizontally placing a first top plate 306 and marking out a longitudinal and transverse datum line; according to the longitudinal and transverse reference lines, position lines of the web plate 303 and the second stiffening plate 305 are drawn in sequence, and the web plate 303 and the second stiffening plate 305 are assembled in sequence according to the position lines; then, a position line of the web 303 is scribed on the first bottom plate 302, and the web 303 and the first bottom plate 302 are assembled according to the position line. S101, pre-buried steel plate unit piece assembling: horizontally placing the tower wall embedded steel plate 301 on a scribing platform, and scribing a longitudinal and transverse datum line on the tower wall embedded steel plate 301; marking out position lines of the first stiffening plate 309 on the embedded side and the stiffening plate according to the longitudinal and transverse datum lines; the first stiffener 309 and stiffener are assembled according to the position lines. In step S101, before assembly, the shear nails need to be welded to the tower wall embedded steel plate 301, the first stiffening plate 309, and the stiffening plate in advance, and some shear nails affecting the weld joint portion may be repaired after assembly of the single elements is completed. The shear pin comprises: the first shear nails 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 vertical to the reinforcing plate; and the third shear nails are positioned on the tower wall embedded steel plate 301 and are perpendicular to each other. S102, marking a positioning line of a steel corbel on the tower wall pre-embedded steel plate 301 and a projection line of the anchor pipe 310 on the tower wall pre-embedded steel plate 301. In step S102, firstly, the deviation of the outer dimensions of the tower wall embedded steel plate 301 is retested, the vertical and horizontal baselines are corrected during scribing, and then the top surface assembly position of the first top plate 306 is found as an assembly reference with the vertical and horizontal baselines as a reference. S103, assembling the steel bracket by adopting a laser measuring instrument in a matching manner, welding a penetration welding seam of the steel bracket and the tower wall embedded steel plate 301, and correcting welding deformation by adopting post-welding flame. In step S103, the web 303 of the steel bracket, the first top plate 306 and the first bottom plate 302 are respectively welded to the tower wall embedded steel plate 301. And S104, vertically arranging the tower wall embedded steel plate 301 on a steel platform, and installing and welding the anchor pipe 310 through the projection line of the anchor pipe 310 and the projection ground sample in a matching manner.
In an alternative embodiment, in step S1, the steel anchor beam is assembled by the following steps: s1001, assembling and positioning of the steel anchor beam partition plate 313: laying the second bottom plate 312 on a platform, drawing a longitudinal base line of the second bottom plate 312 by the center of the second bottom plate 312 in the width direction, drawing a transverse base line of the second bottom plate 312 and an assembling position line of the inner partition 313 by the center of the second bottom plate 312 in the length direction, and assembling the partition 313 according to the position line; s1002, assembling a steel anchor beam groove: hoisting the two side pull plate 314 units into a jig frame, tightly jacking the side pull plates 314 and the partition plates 313 by using a jack, finely adjusting the transverse position by matching the jack with the side pull plates 314, and controlling the size of the port of the steel anchor beam by taking the end partition plates 313 as inner templates; after groove type positioning is completed, firstly, assembly welding is carried out on the groove type, then, positioning welding is adopted to fix the groove type, and polishing and smoothing are carried out after welding is completed on a welding seam inside the groove type; s1003, assembling the pressure bearing plate assembly: and the pressure bearing plate assembly is hung in the groove type 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, the anchor pad 311 is installed: and respectively installing an anchor backing plate 311 by adopting the matching of a laser measuring instrument, and welding the pressure-bearing member 317 and the anchor backing plate 311 to weld through. 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, surface treatment of the second base plate 312: in order to control the flatness of the friction surface of the second bottom plate 312 of the steel anchor beam, the joint surface of the steel anchor beam and the steel bracket is matched to meet the requirements of design and manufacturing rules, and the friction surface part of the second bottom plate 312 of the steel anchor beam is subjected to machining and surface milling treatment. S1006, drilling a steel anchor beam: and (3) transferring the steel anchor beam to a scribing platform, scribing longitudinal and transverse datum lines by using 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 drilling opposite line of the side pull plate 314 unit by using the longitudinal datum line and the transverse datum line, matching a magnetic drill with a drill to mold holes after the steel anchor beam is inspected to be qualified, and finishing the machining and manufacturing of the steel anchor beam after the steel anchor beam is inspected to be qualified. S1007, checking and accepting finished products: in order to ensure that the appearance and the assembly dimension of the steel anchor beam meet the acceptance requirements, the precision requirements of semi-finished products and finished products of the steel anchor beam need to be formulated according to the relevant dimensions, and the inspection contents mainly comprise the items of component marking deviation, structural installation verticality, straightness deviation, axis angle deviation of an anchor box inhaul cable, axis deviation of a second bottom plate 312 hole group of the steel anchor beam and the inhaul cable, integral structure dimension deviation and the like. It should be understood that the above description is exemplary only and that the embodiments of the present application are not intended to be limiting.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. A river-crossing A-type stay cable anchoring structure for highway and railway is characterized by comprising a steel anchor beam and steel bracket components, wherein two ends of the steel anchor beam are correspondingly supported between the two oppositely-arranged steel bracket components;
the steel bracket assembly comprises an embedded steel plate unit and a steel bracket;
the pre-buried steel plate unit comprises:
the tower wall embedded steel plate is vertically arranged, and the lower part of the inner side of the tower wall embedded steel plate is fixedly provided with the steel corbel;
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 embedded steel plate of the tower wall and distributed opposite to the steel corbel, and a second shear nail is arranged on the reinforcing plate;
the third shear nails are fixedly arranged on the outer side surface of the tower wall embedded steel plate;
the tower wall embedded steel plate is provided with an anchor pipe hole corresponding to the anchor pipe, one end of the anchor pipe penetrates through the anchor pipe hole and then extends 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.
2. The dual-purpose river-crossing A-type stay cable anchoring structure for roads and railways as claimed in claim 1, wherein the two steel corbels are symmetrically distributed along a vertical center line of the embedded steel plate on the tower wall;
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 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 river-crossing A-type stay cable anchoring structure for both highway and railway according to claim 2, wherein the reinforcing plate comprises an upper reinforcing plate and a lower reinforcing plate, and the shape, size and height of the upper reinforcing plate correspond to those of the first top plate; the shape, size and height of the lower reinforcing plate correspond to those of the first bottom plate.
4. The river-crossing A-type stay cable anchoring structure for both highway and railway 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 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 lower section of the first stiffening plate is positioned between the upper stiffening plate and the lower stiffening plate.
5. A construction method of the highway-railway dual-purpose river-crossing A-type stay cable anchoring structure as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
s1, respectively assembling a steel anchor beam and a steel corbel assembly, and installing a temporary reinforcing matching member for a tool;
s2, machining the surface of a base plate arranged between the steel anchor beam and the steel bracket to enable the friction coefficient of the base plate between the steel anchor beam and the bracket to be less than or equal to 0.05;
s3, integrally assembling the steel anchor beam and the steel bracket assembly, connecting the steel anchor beam and the steel bracket corresponding to the side span end with a high-strength bolt to apply pre-tightening force to form a consolidation state, temporarily consolidating the steel anchor beam and the steel bracket corresponding to the main span side with the high-strength bolt, and forming an integral structure by using a temporary consolidation matching component;
s4, integrally hoisting the steel anchor beam and the steel corbel, and pouring concrete of the corresponding section of tower column according to the construction progress; before tensioning the corresponding stay cable, releasing the pre-tightening force of the high-strength bolt temporarily solidified on the main span side steel anchor beam, ensuring that a nut and a gasket do not fall off, and dismantling a temporary reinforcing matching member for an assembly tool;
and S5, after the full-bridge stay cable is tensioned, screwing the high-strength bolt between the main span side steel anchor beam and the steel bracket, and completely locking the relative sliding between the steel anchor beam and the steel bracket.
6. The construction method of the A-shaped cross-river A-shaped stay cable anchoring structure for both roads and railways according to claim 5, wherein in the step S1, the assembling step of the steel corbel assembly is as follows:
s101, marking longitudinal and transverse datum lines on the outer sides of pre-buried steel plates on a tower wall, marking position lines of a first stiffening plate and a stiffening plate on a pre-buried side according to the longitudinal and transverse datum lines, and assembling the first stiffening plate and the stiffening plate according to the position lines;
s102, marking out 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, assembling the steel bracket by adopting a laser measuring instrument in a matching manner, welding a penetration weld joint of the steel bracket and the pre-buried steel plate of the tower wall, and correcting welding deformation by adopting post-welding flame;
and S104, vertically arranging the tower wall embedded steel plate on a steel platform, and installing and welding an anchor pipe in a manner of matching with a projection ground sample through an anchor pipe projection line.
7. The construction method of the A-shaped cross-river dual-purpose A-shaped stay cable anchoring structure for roads and railways according to claim 6, wherein in the step S1, the step of assembling the steel corbels comprises the following steps: firstly, horizontally placing a first top plate, and marking out a longitudinal and transverse datum line; sequentially marking out position lines of the web plate and the second stiffening plate according to the longitudinal and transverse reference lines, and sequentially assembling the web plate and the second stiffening plate according to the position lines; the first base plate is then scribed for the position of the web, and the web and first base plate are assembled together according to the position.
8. The construction method for the river-crossing A-type stay cable anchoring structure for both highway and railway according to claim 7, wherein in step S102, firstly, the external dimension deviation of the pre-buried steel plate of the tower wall is retested, the longitudinal and transverse base lines are corrected during scribing, and then the assembly position of the top surface of the first top plate is found out as an assembly reference by taking the longitudinal and transverse base lines as a reference.
9. The construction method for the river-crossing A-type stay cable anchoring structure according to claim 8, wherein in step S103, the web, the first top plate and the first bottom plate of the steel corbel are respectively welded to the embedded steel plates of the tower wall.
10. The construction method of the highway-railway dual-purpose cross-river A-shaped stay cable anchoring structure as claimed in claim 5, wherein in step S101, before assembly, the shear pins are welded to the tower wall embedded steel plate, the first stiffening plate and the stiffening plate in advance, and the shear pins affecting the welding seam part can be subjected to repair welding after the assembly of the single elements is completed.
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116575334A (en) * | 2023-04-28 | 2023-08-11 | 中铁九桥工程有限公司 | A construction method for cross-segment anchor pipes |
| CN118241546A (en) * | 2024-05-28 | 2024-06-25 | 福建省高速公路科技创新研究院有限公司 | A structure for connecting steel bracket and concrete tower wall in the anchoring area of cable tower |
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| JP2014047489A (en) * | 2012-08-30 | 2014-03-17 | Sumitomo Mitsui Construction Co Ltd | Anchorage structure of oblique cable |
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115341467B (en) | 2023-06-02 |
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