CN113215988A - Prestressed steel strand anchoring process for bridge construction - Google Patents
Prestressed steel strand anchoring process for bridge construction Download PDFInfo
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- CN113215988A CN113215988A CN202110071898.1A CN202110071898A CN113215988A CN 113215988 A CN113215988 A CN 113215988A CN 202110071898 A CN202110071898 A CN 202110071898A CN 113215988 A CN113215988 A CN 113215988A
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- steel strand
- fixing
- centering
- polishing
- anchoring
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 225
- 239000010959 steel Substances 0.000 title claims abstract description 225
- 238000004873 anchoring Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 238000005498 polishing Methods 0.000 claims abstract description 65
- 230000007246 mechanism Effects 0.000 claims abstract description 63
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000011499 joint compound Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
- E01D2101/32—Metal prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention belongs to the field of constructional engineering construction, and relates to a prestressed steel strand anchoring process for bridge construction, which mainly comprises the following steps: s1: starting a motor, conveying the steel strand by using an anchoring device, and penetrating through a strand penetrating pipeline; s2: stopping the machine, fixing one end of the stranded steel strand on a fixing unit of the anchoring device, and restarting the machine to clean the surface of the steel strand, which is required to be clamped and fixed; s3: adjusting the cleaned steel strand to a proper position for fixing, and pouring cement; s4: and tensioning, anchoring and sealing the steel strand tensioning section. The anchoring device comprises a box body, wherein a reciprocating mechanism for pulling the steel strand to reciprocate, a polishing mechanism for polishing the steel strand and an adjusting mechanism for adjusting the anchoring length of the steel strand are arranged in the box body. The invention not only can guide and clean the prestressed steel strand, but also can adaptively adjust the prestress of the steel strand and ensure that the length direction of the steel strand is vertical to the anchoring device during tensioning.
Description
Technical Field
The invention belongs to the field of constructional engineering construction, and relates to a prestressed steel strand anchoring process for bridge construction.
Background
At present, a plurality of buildings, bridges and the like in China enter the maintenance and reinforcement period, a large number of buildings need to be reformed and reinforced to meet the requirements of rapid development of society, economy, culture and the like in China, and a plurality of buildings all over the country need to be subjected to earthquake resistance reinforcement, so that an efficient reinforcement method is urgently needed. The conventional concrete structure reinforcing method includes: the reinforcing methods of enlarging the cross section, sticking steel, sticking fiber composite materials, steel wire meshes, external prestress and the like have the defects of complex construction, high labor intensity, damage to the structure, high cost and the like, and the reinforced structure is often subjected to bonding damage, so that the high performance of the reinforcing material cannot be fully utilized. The non-prestressed steel strand reinforcement technology has an obvious strain hysteresis phenomenon, the high-strength performance of a reinforcement material cannot be fully exerted, the reinforced structure is often subjected to adhesive failure, and due to the fact that the adhesive failure has a plurality of influence factors, the established calculation model is complex, the structure reinforcement design calculation is inconvenient, and the popularization and application of the high-strength steel strand in the reinforcement field are restricted. The prestress steel strand reinforcing technology integrates the advantages of an external prestress reinforcing technology and a high-strength steel strand reinforcing technology, is a novel reinforcing technology, can give full play to the high-strength characteristic of the steel strand, does not generate bonding damage, obviously improves the rigidity and the bearing capacity of a structure, has little influence on the increase of the self weight of the structure, improves the ductility of the structure, has simple and convenient construction process, does not influence the use of the building during construction, can establish a simple and suitable calculation model based on the basic theory of prestressed concrete, and is applied to reinforcement design and construction practice.
However, in the use process, oil stains, mud and sand or mortar are adhered to the steel strands, so that the steel strands are easy to slide during tensioning; the existing prestressed steel strand anchoring device cannot adaptively adjust the prestress of the steel strand; in actual use, the prestressed steel strand is manually threaded, and the length direction of the steel strand can not be ensured to be vertical to the anchoring device when the prestressed steel strand is tensioned after anchoring. Therefore, at present, a prestressed steel strand anchoring process for bridge construction is urgently needed, the prestressed steel strand can be guided and cleaned, the prestress of the steel strand can be adaptively adjusted, and the length direction of the steel strand is perpendicular to an anchoring device in tensioning is ensured.
Disclosure of Invention
The invention aims to provide a prestressed steel strand anchoring process for bridge construction, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a prestressed steel strand anchoring process for bridge construction is characterized in that: the method mainly comprises the following steps:
s1: starting a motor, conveying the steel strand by using an anchoring device, and penetrating through a strand penetrating pipeline;
s2: stopping the machine, fixing one end of the stranded steel strand on a fixing unit of the anchoring device, and restarting the machine to clean the surface of the steel strand, which is required to be clamped and fixed;
s3: adjusting the cleaned steel strand to a proper position for fixing, and pouring cement;
s4: tensioning, anchoring and sealing the steel strand tensioning section;
the anchoring device in the S1 comprises a box body, wherein a reciprocating mechanism for pulling the steel strand to reciprocate, a polishing mechanism for polishing the steel strand and an adjusting mechanism for adjusting the anchoring length of the steel strand are arranged in the box body. The invention not only can guide and clean the prestressed steel strand, but also can adaptively adjust the prestress of the steel strand and ensure that the length direction of the steel strand is vertical to the anchoring device during tensioning.
Furthermore, the reciprocating mechanism comprises two fixed columns a which are vertically fixed on two sides of the box body respectively, sliding grooves are formed in the upper portions of the fixed columns a, sliding blocks slide in the sliding grooves, the two sliding blocks are connected through a fixing unit, and the fixing unit is used for fixing the steel strand; and a cross rod is fixedly arranged on the sliding block, and two ends of the cross rod are connected with the polishing mechanism through connecting rods. The reciprocating mechanism is driven to reciprocate by the driving force of the grinding gear, so that the section of the steel strand needing to be cleaned and the grinding part of the grinding gear are repeatedly rubbed, and the cleaning effect is achieved.
Furthermore, the fixing unit comprises a fixing rod, two ends of the fixing rod are respectively fixedly connected with the sliding blocks on the fixing columns a on two sides of the box body, a through hole a is formed in the fixing rod, and a variable clamping force fixing piece is arranged at the through hole a. The variable clamping force fixing piece is used for setting different clamping forces to meet the requirements of different tension forces, and the tension force is judged to meet the requirements by generating slippage between the variable clamping force fixing piece and the steel strand, so that the consistency of the tension force applied to the steel strand is ensured; if the tensile force is judged to meet the requirement only by the elongation of the steel strand, because the specific conditions of the steel strand are different during the strand pulling, the deformation amount of the steel strand is different under the same tensile force, and the anchoring effect of the prestressed steel strand is influenced.
Furthermore, the polishing mechanism comprises two mutually meshed polishing gears, the steel strand penetrates through the polishing mechanism from the space between the two polishing gears, the two polishing gears polish the steel strand through polishing parts arranged along the circumferential direction of the polishing gears, and a protruding part is fixedly arranged on the end surface of each polishing gear and connected with the connecting rod; the grinding mechanism further comprises an input shaft which is rotatably arranged on the box body, and the input shaft drives the grinding gear to rotate. According to the invention, the polishing gear is adopted for polishing, and the polishing part is arranged along the circumferential direction of the polishing gear, so that the area of the polishing part is increased, and the service life is prolonged; and the polishing part can not only clean the steel strand, but also convey the steel strand through the friction force with the steel strand.
Further, the polishing mechanism is a polishing ring which is fixedly installed on the box body and polishes the steel strand moving in a reciprocating mode. The invention can also use the polishing ring fixedly arranged on the box body to clean the steel strand.
Furthermore, the adjusting mechanism comprises an adjusting plate which is installed on the box body in a sliding mode along the vertical direction, a rack section is arranged on the upper portion of the adjusting plate and meshed with the polishing gear, a wedge surface block is installed on the lower portion of the adjusting plate and connected with the centering unit, the polishing gear controls the adjusting plate to move up and down and further controls the wedge surface block to drive the centering unit to move, and the centering unit is used for centering the steel strand when the steel strand is polished and tensioned; the adjusting plate is also provided with a fixing column b, and the fixing column b can fix the adjusting plate on the box body through a fixing nut; the bottom end of the adjusting plate is fixedly connected with the fixing plate, the adjusting plate adjusts the anchoring length by controlling the displacement of the fixing plate, and the fixing plate is provided with a through hole b for the steel strand to pass through. In order to ensure that the length direction of the steel strand is perpendicular to the anchoring device, the centering unit is arranged for centering the steel strand, the driving force of the grinding gear is utilized to drive the wedge surface block of the adjusting plate to extrude the centering piece, so that the centering of the steel strand is realized, the length direction of the steel strand is perpendicular to the anchoring device no matter in the stages of guiding, cleaning or tensioning, and the phenomenon that the steel strand is bent to cause tensioning eccentricity and generate errors is avoided.
Further, the centering unit comprises a centering piece, the centering piece is slidably mounted on the box body, the sliding direction of the centering piece is perpendicular to the sliding direction of the adjusting plate, a semicircular through hole c is formed in one end of the centering piece, the other end of the centering piece is connected with the pressing plate, the pressing plate is slidably mounted on the centering piece, the sliding direction of the pressing plate is parallel to the sliding direction of the centering piece, and a compression spring is arranged between the pressing plate and the centering piece along the sliding direction of the pressing plate. The arrangement that the centering piece is driven to clamp enables the invention to clamp and center steel strands facing different specifications.
The working principle is that as shown in figures 1-10, when anchoring is carried out, a steel strand needs to penetrate through a strand penetrating pipeline, and the operation is specifically carried out; firstly, a steel strand penetrates through a through hole b on a fixing plate in an adjusting mechanism and then penetrates between two grinding gear grinding parts in a grinding mechanism; starting the motor, starting the output shaft to rotate, and starting the two grinding gears to rotate; friction force exists between the steel strand and the polishing part, and the steel strand moves outwards under the driving of the friction force, so that the steel strand is conveyed by the anchoring device; during conveying, the grinding gear is meshed with a rack section of the adjusting plate to drive the adjusting plate to move downwards, and a wedge surface block on the adjusting plate extrudes a pressing plate on the centering unit to enable a centering piece to press the steel strand, so that the centering of the steel strand is realized, and the length direction of the steel strand is perpendicular to the anchoring device; after the centering piece completely compresses the steel strand, the polishing gear is separated from the rack section of the adjusting plate, the polishing gear continues to rotate to convey the steel strand, and the adjusting plate does not generate displacement at the moment.
Carry and need clear up the anchor position of steel strand wires after accomplishing, avoid the steel strand wires to glue to have greasy dirt, silt or mortar to cause the smooth silk of steel strand wires when the stretch-draw easily, concrete operation is: adjusting the anchoring position of the steel strand to the position of the grinding mechanism, fixing the steel strand at the fixed rod of the fixing unit in the reciprocating mechanism, starting the motor, starting the output shaft to rotate, and starting the two grinding gears to rotate; the polishing gear is connected with the reciprocating mechanism through the protruding part, the reciprocating mechanism starts to move, the sliding block reciprocates in the sliding groove on the fixed column a, and the steel strand is fixed on the fixed rod, so that the steel strand moves up and down in a reciprocating mode at the moment and generates friction with the polishing part of the polishing gear which continuously rotates, and oil dirt, sand or mortar adhered to the steel strand is removed; at the moment, the grinding gear is always separated from the rack section of the adjusting plate, the grinding gear continues to rotate to clean the steel strand, and the adjusting plate controls the centering piece to compress the steel strand all the time.
After the cleaning, the steel strand needs to be anchored and tensioned, and the concrete operations are as follows: reinstalling an anchoring device, enabling the steel strand to pass through a through hole b in a fixing plate in the adjusting mechanism, then passing through a grinding part of two grinding gears in the grinding mechanism, placing the anchoring position of the steel strand at the through hole b of the fixing plate right, enabling the sliding block to be in an upward stroke, fixing the steel strand by using a variable clamping force fixing piece in the fixing unit, and selecting a proper clamping force to clamp the steel strand according to the tensile force requirement; at the moment, the adaptability of the prestress of the steel strand can be adjusted, and the specific operation is as follows: firstly, moving an adjusting plate downwards to completely separate a rack section from a grinding gear, tightly pressing a steel strand by a centering piece, controlling the adjusting plate to adjust the position of a fixing plate according to actual conditions, and fixing the adjusting plate by a fixing nut after the anchoring length is determined, wherein the anchoring length is that the steel strand is arranged at the lower section of the fixing plate; pouring cement in the anchoring section after the adjustment is finished; and then, starting tensioning, specifically starting a motor, starting rotation of an output shaft, starting rotation of two grinding gears, starting movement of a reciprocating mechanism, upwards enabling a fixed rod to tension the steel strand by a sliding block, enabling the steel strand to deform, enabling the steel strand to slide when the tension of the fixed rod exceeds the clamping force of the variable clamping force fixing piece, completing tensioning when all the variable clamping force fixing pieces and the steel strand slide, and then anchoring and sealing.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
the invention not only can guide and clean the prestressed steel strand, but also can adaptively adjust the prestress of the steel strand and ensure that the length direction of the steel strand is vertical to the anchoring device during tensioning.
In order to ensure that the length direction of the steel strand is perpendicular to the anchoring device, the centering unit is arranged for centering the steel strand, the driving force of the grinding gear is utilized to drive the wedge surface block of the adjusting plate to extrude the centering piece, so that the centering of the steel strand is realized, the length direction of the steel strand is perpendicular to the anchoring device no matter in the stages of guiding, cleaning or tensioning, and the phenomenon that the steel strand is bent to cause tensioning eccentricity and generate errors is avoided.
The reciprocating mechanism is driven to reciprocate by the driving force of the grinding gear, so that the section of the steel strand needing to be cleaned and the grinding part of the grinding gear are repeatedly rubbed, and the cleaning effect is achieved.
According to the invention, the polishing gear is adopted for polishing, and the polishing part is arranged along the circumferential direction of the polishing gear, so that the area of the polishing part is increased, and the service life is prolonged; and the polishing part can not only clean the steel strand, but also convey the steel strand through the friction force with the steel strand.
The variable clamping force fixing piece is used for setting different clamping forces to meet the requirements of different tension forces, and the tension force is judged to meet the requirements by generating slippage between the variable clamping force fixing piece and the steel strand, so that the consistency of the tension force applied to the steel strand is ensured; if the tensile force is judged to meet the requirement only by the elongation of the steel strand, because the specific conditions of the steel strand are different during the strand pulling, the deformation amount of the steel strand is different under the same tensile force, and the anchoring effect of the prestressed steel strand is influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of the anchoring process of prestressed steel strands for bridge construction according to the present invention;
FIG. 2 is a schematic axial view of the anchoring device of the present invention;
FIG. 3 is a front view of the anchoring device of the present invention;
FIG. 4 is a schematic view of the anchor apparatus of the present invention with the housing removed;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a schematic structural view of a reciprocating mechanism, a grinding mechanism and an adjusting mechanism in the anchoring device of the present invention;
FIG. 7 is an enlarged view of a portion B of FIG. 6 in accordance with the present invention;
FIG. 8 is an enlarged view of a portion of C of FIG. 6 in accordance with the present invention;
FIG. 9 is a schematic view of an adjusting plate of the adjusting mechanism of the present invention;
fig. 10 is a schematic structural view of a centering unit in the adjusting mechanism of the present invention.
Reference numerals
The device comprises a box body 1, a reciprocating mechanism 2, fixed columns 21, fixed columns 211, sliding chutes 22, sliding blocks 23, fixed units 231, fixed rods 2311, through holes a, 232, variable clamping force fixing pieces 24, cross rods 25, connecting rods 3, polishing mechanisms 31, polishing gears 311, polishing parts 32, bosses 33, input shafts 33, adjusting mechanisms 4, adjusting plates 41, rack segments 411, wedge surface blocks 412, fixed columns 413, fixed columns 42, centering units 421, centering pieces 4211, through holes c, compression springs 422, compression plates 423, fixing nuts 424, fixing nuts 43, fixed plates 431, through holes b and steel strands 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 10 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 10, the present embodiment provides a prestressed steel strand anchoring process for bridge construction, which is characterized in that: the method mainly comprises the following steps:
s1: starting a motor, conveying the steel strand 5 by using an anchoring device, and penetrating through a strand penetrating pipeline;
s2: stopping the machine, fixing one end of the stranded steel strand 5 which is threaded on the fixing unit 23 of the anchoring device, and restarting the machine to clean the surface of the fixed section of the stranded steel strand 5 which needs to be clamped;
s3: adjusting the cleaned steel strand 5 to a proper position for fixing, and pouring cement;
s4: tensioning, anchoring and sealing the tensioning section of the steel strand 5;
the anchoring device in the S1 comprises a box body 1, wherein a reciprocating mechanism 2 for pulling the steel strand 5 to reciprocate, a grinding mechanism 3 for grinding the steel strand 5 and an adjusting mechanism 4 for adjusting the anchoring length of the steel strand 5 are arranged in the box body 1. The invention not only can guide and clean the prestressed steel strand 5, but also can adaptively adjust the prestress of the steel strand 5 and ensure that the length direction of the steel strand 5 is vertical to the anchoring device during tensioning
As shown in fig. 2, 6 and 7, the reciprocating mechanism 2 includes two fixing posts a21 vertically fixed on two sides of the box 1, respectively, a sliding slot 211 is opened on the upper portion of the fixing post a21, the sliding block 22 slides in the sliding slot 211, the two sliding blocks 22 are connected through a fixing unit 23, and the fixing unit 23 is used for fixing the steel strand 5; a cross bar 24 is fixedly arranged on the slide block 22, and two ends of the cross bar 24 are connected with the grinding mechanism 3 through connecting rods 25. According to the invention, the reciprocating mechanism 2 is driven to reciprocate by the driving force of the grinding gear 31, so that the section of the steel strand 5 to be cleaned and the grinding part 311 of the grinding gear 31 are repeatedly rubbed, and the cleaning effect is achieved.
As shown in fig. 4 and 5, the fixing unit 23 includes a fixing rod 231, two ends of the fixing rod 231 are respectively and fixedly connected to the sliders 22 on the fixing posts a21 on two sides of the box 1, a through hole a2311 is formed in the fixing rod 231, and a variable clamping force fixing member 232 is disposed at the through hole a 2311. According to the invention, different clamping forces are set through the variable clamping force fixing piece 232 to meet different tension force requirements, and the tension force is judged to meet the requirements through the slippage generated between the variable clamping force fixing piece 232 and the steel strand 5, so that the consistency of the tension force applied to the steel strand 5 is ensured; if the tensile force is judged to meet the requirement only by the elongation of the steel strand 5, the deformation amount of the steel strand 5 is different under the same tensile force because the specific conditions of the steel strand 5 are different during the strand pulling, and the anchoring effect of the prestressed steel strand 5 is influenced.
As shown in fig. 6, the polishing mechanism 3 includes two polishing gears 31 engaged with each other, the steel strand 5 passes through the polishing mechanism 3 between the two polishing gears 31, the two polishing gears 31 polish the steel strand 5 through polishing portions 311 formed along the circumferential direction of the polishing gears 31, a protrusion 32 is further fixedly mounted on the end surface of each polishing gear 31, and the protrusion 32 is connected with the connecting rod 25; the grinding mechanism 3 further comprises an input shaft 33 rotatably mounted on the housing 1, the input shaft 33 driving the grinding gear 31 to rotate. According to the invention, the grinding gear 31 is adopted for grinding, and the grinding part 311 is arranged along the circumferential direction of the grinding gear 31, so that the area of the grinding part 311 is increased, and the service life is prolonged; and the polishing part 311 can not only clean the steel strand 5, but also convey the steel strand 5 by the friction force with the steel strand 5.
The invention also provides another scheme, the grinding mechanism 3 is a grinding ring which is fixedly arranged on the box body 1 and is used for grinding the steel strand 5 which moves back and forth. The invention can also use the polishing ring fixedly arranged on the box body 1 to clean the steel strand 5.
As shown in fig. 6, 8 and 9, the adjusting mechanism 4 includes an adjusting plate 41 slidably mounted on the box 1 along a vertical direction, a rack segment 411 is provided at an upper portion of the adjusting plate 41 to engage with the grinding gear 31, a wedge surface block 412 is mounted at a lower portion of the adjusting plate 41, the wedge surface block 412 is connected to the centering unit 42, the grinding gear 31 controls the adjusting plate 41 to move up and down, and further controls the wedge surface block 412 to drive the centering unit 42 to move, and the centering unit 42 is used for centering the steel strand 5 when the steel strand 5 is ground and tensioned; a fixing column b413 is further arranged on the adjusting plate 41, and the adjusting plate 41 can be fixed on the box body 1 through a fixing nut 424 by the fixing column b 413; the bottom end of the adjusting plate 41 is fixedly connected with the fixing plate 43, the adjusting plate 41 adjusts the anchoring length by controlling the displacement of the fixing plate 43, and the fixing plate 43 is provided with a through hole b431 for the steel strand 5 to pass through. In order to ensure that the length direction of the steel strand 5 is perpendicular to the anchoring device, the centering unit 42 is arranged for centering the steel strand 5, the wedge surface block 412 of the adjusting plate 41 is driven to extrude the centering piece 421 by utilizing the driving force of the polishing gear 31, so that the centering of the steel strand 5 is realized, the length direction of the steel strand 5 is perpendicular to the anchoring device no matter in the stages of guiding, cleaning or tensioning, and the error caused by the fact that the steel strand 5 is bent to cause tensioning eccentricity is avoided.
As shown in fig. 9 and 10, the centering unit 42 includes a centering member 421, the centering member 421 is slidably mounted on the box body 1, a sliding direction of the centering member 421 is perpendicular to a sliding direction of the adjusting plate 41, one end of the centering member 421 is provided with a semicircular through hole c4211, the other end of the centering member 421 is connected to the pressing plate 423, the pressing plate 423 is slidably mounted on the centering member 421, the sliding direction of the pressing plate 423 is parallel to the sliding direction of the centering member 421, and a compression spring 422 is disposed between the pressing plate 423 and the centering member 421 along the sliding direction of the pressing plate 423. The arrangement of the centering members 421 being driven to clamp makes it possible to clamp and center all the steel strands 5 facing different specifications.
The working principle is that as shown in fig. 1-10, when anchoring is carried out, the steel strand 5 needs to penetrate through a bundle penetrating pipeline, and the concrete operation is as follows: as shown in fig. 6, the steel strand 5 firstly passes through the through hole b431 of the fixing plate 43 in the adjusting mechanism 4, and then passes through between the grinding parts 311 of the two grinding gears 31 in the grinding mechanism 3; the motor is started, the motor starts to drive the input shaft 33 to rotate, and the two grinding gears 31 start to rotate; friction force exists between the steel strand 5 and the polishing part 311, and the steel strand 5 moves outwards under the driving of the friction force, so that the steel strand 5 is conveyed by the anchoring device; at this time, since one end of the steel strand 5 is not fixed to the fixing unit 23 of the anchor, the movement of the reciprocating mechanism does not act on the steel strand (see fig. 4). As shown in fig. 6, 8 and 9, while conveying, the grinding gear 31 is engaged with the rack segment 411 of the adjusting plate 41 to drive the adjusting plate 41 to move downwards, the wedge surface block 412 on the adjusting plate 41 presses the pressing plate 423 on the centering unit 42, the pressing plate 423 presses the centering member 421 through the compression spring 422, so that the centering member 421 presses the steel strand 5 to center the steel strand 5, and the conveying direction of the steel strand 5 is perpendicular to the anchoring device; after the centering member 421 completely compresses the steel strand 5, the grinding gear 31 is disengaged from the rack segment 411 of the adjusting plate 41, and the grinding gear 31 continues to rotate to convey the steel strand 5, so that the adjusting plate 41 does not displace. The centering unit is arranged for centering the steel strand, so that on one hand, the conveying direction of the steel strand is perpendicular to the anchoring device, the steel strand can be conveyed along the specified direction during conveying, and the steel strand is prevented from breaking a bundle penetrating pipeline due to bending; on the other hand, the centering piece 421 compresses the steel strand 5, so that garbage attached to the surface of the steel strand can be cleaned simply in the conveying process.
The anchoring position of the steel strand 5 needs to be cleaned after the conveying is finished, so that the phenomenon that the steel strand 5 is adhered with oil stains, silt or mortar to easily cause the sliding of the steel strand 5 during tensioning is avoided, and the concrete operations are as follows: as shown in fig. 6, the anchoring position of the steel strand 5 is adjusted to the position of the grinding mechanism 3. At this time, the steel strand 5 is fixed at the fixing rod 231 of the fixing unit 23 in the reciprocating mechanism 2 (see fig. 4 and 5), as shown in fig. 4 and 6, the motor is turned on, the input shaft 33 starts to rotate, and the two grinding gears 31 start to rotate; the grinding gear 31 is connected to the reciprocating mechanism 2 through the boss 32, and the reciprocating mechanism 2 starts to move. As shown in fig. 6 and 7, the slide block 22 reciprocates up and down in the sliding groove 211 on the fixed column a21, and the steel strand 5 is fixed on the fixed rod 231, so that the steel strand 5 reciprocates up and down at the moment, and rubs against the grinding part 311 of the grinding gear 31 which rotates continuously, so as to remove oil stains, mud and sand or mortar adhered to the steel strand 5; at this time, the grinding gear 31 is always separated from the rack segment 411 of the adjusting plate 41, the grinding gear 31 continues to rotate to clean the steel strand 5, and the adjusting plate 41 controls the centering member 421 to always press the steel strand 5. The reciprocating mechanism is driven to reciprocate by the driving force of the grinding gear, so that the section of the steel strand, which needs to be cleaned, is repeatedly rubbed with the grinding part of the grinding gear, and the cleaning effect is achieved. In addition, the polishing gear is adopted for polishing, the polishing part is arranged along the circumferential direction of the polishing gear, so that the area of the polishing part is increased, and the service life is prolonged.
After the cleaning is finished, as shown in fig. 4, 5 and 6, the steel strand 5 needs to be anchored and tensioned, and the specific operations are as follows: reinstalling an anchoring device, enabling the steel strand 5 to pass through a through hole b431 in a fixing plate 43 in an adjusting mechanism 4, then passing through a space between two grinding parts 311 of a grinding gear 31 in a grinding mechanism 3, enabling the anchoring position of the steel strand 5 to be just arranged at the through hole b431 of the fixing plate 43, enabling a sliding block 22 to be in an upward stroke, fixing the steel strand 5 by using a variable clamping force fixing piece 232 in a fixing unit 23, and selecting an appropriate clamping force to clamp according to the tension requirement; at this moment, the prestress of the steel strand 5 can be adaptively adjusted, and the operation is as follows: firstly, the adjusting plate 41 moves downwards to enable the rack section 411 to be completely separated from the grinding gear 31, the centering piece 421 always compresses the steel strand 5, the adjusting plate 41 is controlled to adjust the position of the fixing plate 43 according to actual conditions, after the anchoring length is determined, the adjusting plate 41 is fixed by the fixing nut 424, and the anchoring length is that the steel strand 5 is below the fixing plate 43; pouring cement in the anchoring section after the adjustment is finished; and then, starting tensioning, specifically, starting the motor, starting the input shaft 33 to rotate, starting the two grinding gears 31 to rotate, starting the reciprocating mechanism 2 to move, upwards enabling the fixed rod 231 to tension the steel strand 5 by the slide block 22, enabling the steel strand 5 to deform, sliding the steel strand 5 when the tension of the fixed rod 231 exceeds the clamping force of the variable clamping force fixing piece 232, completing tensioning when all the variable clamping force fixing pieces 232 and the steel strand 5 slip, and then, anchoring and sealing. Different clamping forces are set through the variable clamping force fixing piece to meet the requirements of different tension forces, and the tension force is judged to meet the requirements through slipping generated between the variable clamping force fixing piece and the steel strand, so that the consistency of the tension force applied to the steel strand is guaranteed; if the tensile force is judged to meet the requirement only by the elongation of the steel strand, because the specific conditions of the steel strand are different during the strand pulling, the deformation amount of the steel strand is different under the same tensile force, and the anchoring effect of the prestressed steel strand is influenced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A prestressed steel strand anchoring process for bridge construction is characterized in that: the method mainly comprises the following steps:
s1: starting a motor, and conveying the steel strand (5) by using an anchoring device to enable the steel strand to penetrate through a strand penetrating pipeline;
s2: stopping the machine, fixing one end of the stranded steel strand (5) which is penetrated and bundled on a fixing unit (23) of the anchoring device, and starting the machine again to clean the surface of a fixing section, which is required to be clamped, of the stranded steel strand (5);
s3: adjusting the cleaned steel strand (5) to a proper position for fixing;
s4: tensioning the tensioning section of the steel strand (5) and sealing the anchor;
the anchoring device in the S1 comprises a box body (1), wherein a reciprocating mechanism (2) for pulling the steel strand (5) to reciprocate, a grinding mechanism (3) for grinding the steel strand (5) and an adjusting mechanism (4) for adjusting the anchoring length of the steel strand (5) are arranged in the box body (1); the reciprocating mechanism (2) comprises two fixed columns a (21) which are vertically fixed on two sides of the box body (1) respectively, sliding chutes (211) are formed in the upper portions of the fixed columns a (21), sliding blocks (22) are installed in the sliding chutes (211) in a sliding mode, the two sliding blocks (22) are connected through a fixing unit (23), and the fixing unit (23) is further used for fixing the steel strand (5); each sliding block (22) is fixedly provided with a cross rod (24), and two ends of each cross rod (24) are connected with the grinding mechanism (3) through connecting rods (25);
the fixing unit (23) comprises a fixing rod (231), two ends of the fixing rod (231) are fixedly connected with a sliding block (22) on fixing columns a (21) on two sides of the box body (1) respectively, a through hole a (2311) is formed in the fixing rod (231), and a variable clamping force fixing piece (232) is arranged at the through hole a (2311).
2. The prestressed steel strand anchoring process for bridge construction according to claim 1, wherein: the polishing mechanism (3) comprises two mutually meshed polishing gears (31), the steel strand (5) penetrates between the two polishing gears (31), the two polishing gears (31) polish the steel strand (5) through polishing parts (311) arranged along the circumferential direction of the polishing gears (31), a protruding part (32) is fixedly arranged on the end face of each polishing gear (31), and the protruding part (32) is connected with the connecting rod (25); the grinding mechanism (3) further comprises an input shaft (33) rotatably mounted on the box body (1), and the input shaft (33) drives the grinding gear (31) to rotate.
3. The prestressed steel strand anchoring process for bridge construction according to claim 1, wherein: the polishing mechanism (3) is a polishing ring which is fixedly arranged on the box body (1) and polishes the steel strand (5) which moves in a reciprocating mode.
4. The prestressed steel strand anchoring process for bridge construction according to claim 2, wherein: the adjusting mechanism (4) comprises an adjusting plate (41) which is installed on the box body (1) in a sliding mode along the vertical direction, a rack section (411) meshed with the grinding gear (31) is arranged on the upper portion of the adjusting plate (41), a wedge surface block (412) is installed on the lower portion of the adjusting plate (41), the wedge surface block (412) is connected with the centering unit (42) in a passing mode, a grinding gear (31) controls the adjusting plate (41) to move up and down, the wedge surface block (412) is further controlled to drive the centering unit (42) to move, and the centering unit (42) is used for centering the steel strand (5) when the steel strand (5) is ground and tensioned; the adjusting plate (41) is also provided with a fixing column b (413), and the adjusting plate (41) can be fixed on the box body (1) through the fixing nut (424) by the fixing column b (413); the bottom end of the adjusting plate (41) is fixedly connected with the fixing plate (43), the adjusting plate (41) adjusts the anchoring length by driving the fixing plate (43) to move, and the fixing plate (43) is provided with a through hole b (431) through which the steel strand (5) can pass conveniently.
5. The prestressed steel strand anchoring process for bridge construction according to claim 4, wherein: centering unit (42) is including centering (421), centering (421) slidable mounting is on box (1), the slip direction perpendicular to regulating plate (41) slip direction of centering (421), the one end of centering (421) is opened has semicircle-shaped through-hole c (4211), the other end links to each other with pressure strip (423), pressure strip (423) slidable mounting is on centering (421), the slip direction of pressure strip (423) is parallel with the slip direction of centering (421), and along the slip direction of pressure strip (423), be equipped with compression spring (422) between pressure strip (423) and centering (421).
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| CN113215988B (en) | 2022-09-09 |
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Effective date of registration: 20220818 Address after: No. 1, Xinsheng Road, Sanshan Economic Development Zone, Sanshan District, Wuhu City, Anhui Province, 241000 (declaration commitment) Applicant after: Anhui Tongli Prestressed Technology Co.,Ltd. Address before: 610000 No. 14, unit 2, building 11, No. 29, Tongche lane, Jinniu District, Chengdu, Sichuan Applicant before: Deng Lihong |
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