CN114134993A - Installation method for basement steel structure - Google Patents
Installation method for basement steel structure Download PDFInfo
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- CN114134993A CN114134993A CN202111542505.7A CN202111542505A CN114134993A CN 114134993 A CN114134993 A CN 114134993A CN 202111542505 A CN202111542505 A CN 202111542505A CN 114134993 A CN114134993 A CN 114134993A
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- core column
- side wall
- outer side
- rotating shaft
- winding
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/0007—Base structures; Cellars
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
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- 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
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention relates to a steel structure technology, which is used for solving the problems that position deviation is easily caused by shaking in the process of diagonal pulling and vertical hoisting of a core column casing and an electric hoist is hindered from moving by accumulated impurities in a portal frame, in particular to an installation method for a basement steel structure. The position of the vertically hoisted core column casing is limited by the traction line extending downwards from the supporting frame, so that the direction of the suspended core column casing is more limited during hoisting, the impurity scraping plate reciprocates under the driving of the reciprocating screw rod to remove accumulated impurities in the chute in the door frame, so that the accumulated dust impurities are prevented from blocking the electric hoist to move at the position in the door frame.
Description
Technical Field
The invention relates to a steel structure technology, in particular to an installation method for a basement steel structure.
Background
The steel structure is a structure made of steel materials and is one of main building structure types, the structure mainly comprises steel beams, steel columns, steel trusses and other members made of section steel, steel plates and the like, and all the members or parts are usually connected by welding seams, bolts or rivets;
in the prior art, in the process of obliquely pulling and hoisting a core column, the upper end of the core column is connected to an electric hoist through a connecting rope, the lower end of the core column is placed on a transport gun carrier, the core column is easy to deflect due to jolt generated in the traveling process of the transport gun carrier and the influence of external wind power in the hoisting process, the position of the core column is limited to move in a mode of manually dragging the core column by dragging a traction rope in order to keep the stability of the core column in the hoisting process, the weight of the core column is large, when the position is deflected, the acting force required for manually dragging and limiting is large, workers feel fatigue easily, and the core column separated from the transport gun carrier after the deflection easily threatens the life safety of the workers; in the process of vertically hoisting the core column casing, a limiting device is not arranged on the outer side of the core column casing, the suspended core column casing is easy to shake under the action of external action, the hoisted core column casing is difficult to butt joint with a bottom foundation bolt support, partial equipment is used for preventing the suspended core column casing from shaking, the core column casing is difficult to shift greatly in position through traction limiting of traction ropes on two sides of the core column casing, the core column casing is difficult to accurately butt joint with the bottom foundation bolt support after the core column casing is dragged and limited, the core column casing is limited to shift greatly in the direction of the traction ropes, small-range position shifting can be carried out in other directions, and the core column casing is difficult to accurately butt joint with the bottom foundation bolt support, and the limiting traction ropes are required to be manually unbundled after the butt joint is completed, so that the vertical hoisting is very inconvenient; the electric hoist needs to slide along a slide way arranged in the portal frame during hoisting, dust and impurities accumulated in the slide way inside the portal frame are gradually increased during long-time use of the slide way inside the portal frame, so that the electric hoist is easy to be blocked when sliding in the position inside the portal frame, or the electric hoist moving due to impurities bumps, a core column cylinder to be hoisted is stirred greatly, the position is deviated, and the electric hoist is difficult to be accurately installed;
in view of the above technical problem, the present application proposes a solution.
Disclosure of Invention
The invention aims to provide a mounting method for a basement steel structure, which aims to solve the problems that position deviation is caused by the fact that the core column barrel is prone to shaking and the electric hoist is prevented from moving in the portal due to the fact that the core column barrel is inclined to pull and vertically hoisted by means of reciprocating motion of a shoveling plate driven by a reciprocating lead screw, and the electric hoist is prevented from moving in the portal due to accumulated dust impurities, and the problem that the electric hoist is prevented from moving in the portal due to the accumulated impurities in the portal is solved.
The purpose of the invention can be realized by the following technical scheme:
the installation method for the steel structure of the basement depends on a steel installation mechanism and comprises a portal frame, an electric hoist, a core column barrel, a transportation gun carriage and a foundation bolt support, wherein the electric hoist is connected to the lower surface inside the portal frame in a sliding manner, the core column barrel is connected to the lower end of the electric hoist, the transportation gun carriage is arranged at the lower end of the core column barrel, the foundation bolt support is arranged in the middle of the lower surface inside the portal frame, and a traction limiting mechanism is arranged on the upper surface inside the portal frame;
draw stop gear includes the axis of rotation, the electric block lateral wall corresponds axis of rotation position department has seted up the connecting hole, axis of rotation lateral wall both sides integrated into one piece has spacing, the inside upper surface both sides of portal correspond axis of rotation position department is connected with the support frame, portal lateral wall both sides are rotated and are connected with the spiral pivot, the axis of rotation with spiral pivot one end all is connected with the transmission runner, two the transmission runner is connected through first drive belt transmission, portal inside wall both sides correspond spiral pivot position department is connected with the spacing shell of spiral, the inside correspondence of the spacing shell of spiral the spiral pivot position department is connected with the spiral roller, the spiral roller lateral wall is connected with the connecting wire, the connecting wire is kept away from the one end of the spacing shell of spiral is connected with the connector.
As a preferred embodiment of the invention, the outer side wall of the electric hoist is provided with a hoisting limiting mechanism;
the hoisting limiting mechanism comprises a supporting frame, the inner side wall of the supporting frame is connected with a winder, the inner side wall of the winder is connected with a traction wire, the outer side wall of the traction wire is connected with a plurality of auxiliary sliding cylinders which are uniformly distributed, the lower end of the traction wire is connected with a connecting buckle through a connecting cylinder, two sides of the inside of the connecting buckle are both provided with cavities, the middle position of the lower surface of the inside of the cavity at one side of the inside of the connecting buckle is connected with an elastic metal sheet, the upper surface of the connecting buckle is connected with a pressing button in a sliding way at the position corresponding to the elastic metal sheet, one end of the pressing button corresponding to the inside of the cavity is connected with an insulating plate, the lower surface of the pressing button close to two sides of the insulating plate is connected with a reset spring, the inner side wall of the connecting buckle is connected with an electromagnet, and the inside of the cavity at the other side of the connecting buckle is connected with a sliding bolt, and the inner side wall of the cavity is connected with an extension spring at a position corresponding to the sliding bolt.
As a preferred embodiment of the present invention, an anti-blocking mechanism is disposed on the lower surface inside the gantry corresponding to the position of the rotating shaft;
the anti-blocking mechanism comprises a supporting rotating sleeve, connecting frames are integrally formed at the positions, corresponding to the positions of the door frames, of the two sides of the outer side wall of the supporting rotating sleeve, a transmission gear is rotatably connected at the middle position above the outer side wall of the supporting rotating sleeve, a second transmission belt is connected at one side of the inner part of the supporting rotating sleeve, which is close to the outer side wall of the transmission gear, the outer side wall of the connecting frame is rotatably connected with a reciprocating screw rod at a position corresponding to the second transmission belt, the outer side wall of the reciprocating screw rod is rotatably connected with a sundry shoveling plate corresponding to the position of the portal frame, the inner part of the supporting rotating sleeve is rotatably connected with a rotating wheel corresponding to the position of the rotating shaft, the outer side wall of the rotating wheel is provided with an embedded tooth socket corresponding to the position of the transmission gear, the lower surface inside the portal frame is integrally formed with a connecting plate corresponding to the position of the supporting rotating sleeve, and the outer side wall of the connecting plate is connected with a limiting spring corresponding to the position of the supporting rotating sleeve.
In a preferred embodiment of the present invention, a limiting sliding groove is formed in each of the winding shaft and the outer side wall of the winding roller, and a limiting bolt is slidably connected to the limiting sliding groove.
In a preferred embodiment of the present invention, the auxiliary sliding cylinder has a plurality of ball grooves formed in an outer wall thereof, the ball grooves being connected with balls in a sliding manner, the reel is in the shape of a regular octagon, and the length of each side of the reel is greater than that of the auxiliary sliding cylinder.
As a preferred embodiment of the present invention, a driving block is integrally formed on one side of the outer side wall of the sliding bolt close to the inside of the cavity, and an adjusting sliding groove is formed on the outer side wall of the connecting buckle at a position corresponding to the driving block.
A mounting method for a basement steel structure comprises the following steps:
the method comprises the following steps: encrypting axes and elevation control points on site according to original axis control points and elevation control points, measuring and releasing a central cross line and at least two elevation control points of each embedded part according to the axes released by a control line, completing measurement and paying-off operation, accurately positioning a fixed support by using a positioning line and a level gauge, supporting a foundation bolt support in a steel installation mechanism on reinforcing steel bars around a column, performing protection measures on the threads of an anchor bolt after the anchor bolt is installed, checking the foundation bolt support when concrete is poured for the last time, finding deviation and correcting in time, and completing embedding of the foundation bolt support;
step two: the method comprises the following steps that a longitudinal and transverse axis of a column base of each core column casing is discharged, after a measured axis is subjected to ink line snapping, the measurement distance is rechecked for the size between adjacent columns, triangular marks are made after the axis is rechecked without errors and are used as a centering basis when a first section of core column casing is hoisted in place, a center line and an elevation datum line of each core column casing are marked at two ends of each column, each core column casing is installed on the ground by taking a column top as a datum mark, the elevation datum line is at least projected and marked on two surfaces, a hoisting point is arranged at a connecting lug plate which is welded in advance, and hoisting is carried out by adopting a special hoisting tool for clamping and a single machine rotation method;
step three: adjusting an electric hoist on a portal frame to enable a hook at the lower end of the electric hoist to descend to a specified height and be connected with a connecting rope on a core column barrel placed on a transport gun carriage, after the connection, the electric hoist stretches the upper end of the core column barrel under the control of a control device, after the electric hoist pulls the core column barrel to enable the inclination angle between the core column barrel and the transport gun carriage to reach a set range, pulling out connecting wires from the interior of coiling limiting shells at two sides of the portal frame and connecting the coiling limiting shells with two sides of the outer side wall of the core column barrel through a connector at one end of the connecting wires, adjusting a coiling roller after the connection to enable the connecting wires to be kept tight, limiting bolts at the inner side of a movable limiting sliding groove limit coiling rollers on a coiling rotating shaft, starting the transport gun carriage to enable the transport gun carriage to move along with the traction of the electric hoist, enabling a rotating shaft inserted into the middle position of the electric hoist through the connecting holes to rotate along with the rotation of the electric hoist, the transmission rotating wheels connected with the two ends of the rotating shaft and the winding rotating shaft are used for transmission through a first transmission belt, so that the rotating shaft drives the winding roller on the outer side wall of the winding rotating shaft to rotate, the winding roller is used for winding the connecting wire when the position of the core column barrel moves, the connecting wire is kept tight constantly, and the core column barrel is pulled;
step four: after a transport gun carrier transports a core column barrel to the position of a foundation bolt support, the position of a sliding limiting bolt on the inner side of a limiting sliding groove is free from the limitation on the rotation of a winding roll, an electric hoist is made to continue to upwards pull the core column barrel, a worker can manually pull a connecting wire to limit the shaking in the lifting process of the core column barrel, the core column barrel is controlled by a control device to rotate to put down a traction wire after being kept stable, four traction wires put down from the inner side of a cross-shaped supporting frame are uniformly kept in four directions of the outer side wall of the core column barrel, the lower end of the drooping traction wire can be connected to the outer side wall of the foundation bolt support through a connecting buckle, a rear disconnecting connector is connected with the core column barrel, the transport gun carrier is removed, the core column barrel is vertically and slowly put down under the action of the electric hoist, the traction wires limiting the core column barrel in the four directions are connected with balls on an auxiliary sliding barrel through the outer side wall, and the core column barrel The outer side walls slide relatively to each other, so that friction between a traction line and a core column casing is reduced, the core column casing descends to the position of a foundation bolt support and is in butt joint with the upper end of the foundation bolt support, the core column casing descends along the extension direction of the foundation bolt support under the limitation of the traction line, when the core column casing descends and contacts with a press button on the upper surface of a connecting buckle and extrudes the press button to move towards the inner side of a cavity, an insulation plate at the middle position of the lower surface of the press button is inserted into the middle position of the inner part of an elastic metal sheet, a circuit where the elastic metal sheet is located is disconnected due to the separation of the elastic metal sheet, an electromagnet loses power supply and cannot adsorb one ends of the foundation bolt support and a sliding bolt, the sliding bolt retracts into the cavity under the action of the reset action of a stretched stretching spring, and the connecting buckle loses limitation and automatically breaks away from the foundation bolt support, the winder can slowly retract the pull wire under the control of the control equipment.
Compared with the prior art, the invention has the beneficial effects that:
1. the rotating shaft is driven to rotate through rotation in the hoisting process of the electric hoist, so that the winding rotating shaft which is driven by the first driving belt and the rotating shaft can be driven to rotate, and the connecting wire for drawing and limiting the core column barrel in the hoisting process of the electric hoist can automatically tighten the connecting wire under the action of the winding roller, so that the connecting wire is kept in a tight state constantly;
2. the position of a vertically hoisted core column casing is limited by traction lines which extend downwards from the cross-shaped supporting frame and are positioned in four directions, so that the suspended core column casing is more limited in direction during hoisting, the offset distance is smaller when the suspended core column casing moves under the action of external force, the suspended core column casing can be accurately butted with a bottom foundation bolt support, the limiting traction lines can be automatically released after being pressed, and a worker does not need to unbind the core column casing, so that the convenience is improved;
3. drive gear through the running wheel and rotate in-process through the axis of rotation, drive gear drives reciprocal lead screw through the second drive belt and rotates, makes the miscellaneous board of shovel reciprocating motion carry out clearing away of gathering up impurity in the inside spout of portal under the drive of reciprocal lead screw, prevents that the dust impurity of gathering up from hindering electric block to move at the inside position of portal, and causes electric block to move and takes place to jolt, makes the unstable condition of hoisting equipment.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a main body structure view of the present invention;
FIG. 2 is a schematic view of a traction limiting mechanism of the present invention;
FIG. 3 is a view showing the construction of the winding roll of the present invention;
FIG. 4 is a structural diagram of a hoisting limiting mechanism of the present invention;
FIG. 5 is a view of the support frame of the present invention;
FIG. 6 is a view showing the construction of an auxiliary sliding cylinder according to the present invention;
FIG. 7 is a view of the structure of the connector link of the present invention;
FIG. 8 is a view of the internal structure of the cavity of the present invention;
FIG. 9 is a view of the support swivel of the present invention;
FIG. 10 is an enlarged view of portion A of FIG. 9 according to the present invention;
fig. 11 is a view showing the structure of a rotary wheel according to the present invention.
In the figure: 1. a gantry; 2. a traction limiting mechanism; 21. a limiting strip; 22. a rotating shaft; 23. connecting holes; 24. a support frame; 25. a transmission runner; 26. a first drive belt; 27. a winding shaft; 28. a connector; 29. a winding roll; 210. a wire coiling limit shell; 211. a connecting wire; 212. a limiting bolt; 213. a limiting sliding groove; 3. hoisting a limiting mechanism; 31. a reel; 32. a support frame; 33. a pull wire; 34. an auxiliary sliding cylinder; 35. a connecting cylinder; 36. a connecting buckle; 37. a ball bearing; 38. an electromagnet; 39. pressing the button; 310. a resilient metal sheet; 311. an insulating plate; 312. a return spring; 313. sliding the bolt; 314. a drive block; 315. a cavity; 316. an extension spring; 4. an anti-jamming mechanism; 41. supporting the rotating sleeve; 42. a second belt; 43. a reciprocating screw; 44. shoveling the sundry plate; 45. a connecting frame; 46. a transmission gear; 47. a limiting spring; 48. a connecting plate; 49. a rotating wheel; 410. embedding a tooth socket; 5. an electric hoist; 6. a core column; 7. transporting the gun carrier; 8. an anchor bolt support.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1-3, the installation method for the steel structure of the basement depends on a steel installation mechanism, and comprises a portal frame 1, an electric hoist 5, a core column tube 6, a transportation gun carriage 7 and a foundation bolt support 8, wherein the electric hoist 5 is connected to the lower surface in the portal frame 1 in a sliding manner, the core column tube 6 is connected to the lower end of the electric hoist 5, the transportation gun carriage 7 is arranged at the lower end of the core column tube 6, and the foundation bolt support 8 is arranged in the middle position of the lower surface in the portal frame 1;
the upper surface inside the door frame 1 is provided with a traction limiting mechanism 2, the traction limiting mechanism 2 comprises a rotating shaft 22, the outer side wall of the electric hoist 5 is provided with a connecting hole 23 corresponding to the position of the rotating shaft 22, the two sides of the outer side wall of the rotating shaft 22 are integrally formed with a limiting strip 21, the shape of the connecting hole 23 is the same as the shape and the size of the rotating shaft 22 and the limiting strip 21 after forming, so that the electric hoist 5 can slide on the outer side wall of the rotating shaft 22, the two sides of the upper surface inside the door frame 1 are connected with a support frame 24 corresponding to the position of the rotating shaft 22, the two sides of the outer side wall of the door frame 1 are rotatably connected with winding rotating shafts 27, one ends of the rotating shaft 22 and the winding rotating shafts 27 are both connected with transmission rotating wheels 25, the two transmission rotating wheels 25 are in transmission connection through a first transmission belt 26, the two sides of the inner side wall of the door frame 1 are connected with winding limiting shells 210 corresponding to the positions of the winding rotating shafts 27, so that the connecting wires 211 curled on the outer side wall of the winding rotating shafts 27 can change the outgoing direction under the limitation of the winding limiting shells 210, a winding roll 29 is connected to the position, corresponding to the winding rotating shaft 27, inside the winding limiting shell 210, a connecting wire 211 is connected to the outer side wall of the winding roll 29, one end, away from the winding limiting shell 210, of the connecting wire 211 is connected with a connector 28, limiting sliding grooves 213 are formed in the winding rotating shaft 27 and one side of the outer side wall of the winding roll 29, limiting bolts 212 are connected inside the limiting sliding grooves 213 in a sliding mode, when the limiting bolts 212 slide to one side inside the limiting sliding grooves 213, the winding roll 29 can freely rotate on the outer side wall of the winding rotating shaft 27, and when the limiting bolts 212 slide to the other side inside the limiting sliding grooves 213, the winding roll 29 and the winding rotating shaft 27 keep synchronous rotation;
in the prior art, in the process of obliquely pulling and hoisting a core column 6, the upper end of the core column 6 is connected to an electric hoist 5 through a connecting rope, the lower end of the core column 6 is placed on a transport gun carrier 7, the core column 6 is prone to being distorted due to jolt generated in the walking process of the transport gun carrier 7 and the influence of external wind power in the hoisting process, the position of the core column 6 is prone to being distorted, the core column 6 is limited to move in a mode of manually dragging the core column 6 through a dragging rope in order to keep the stability of the core column 6 in the hoisting process, the weight of the core column 6 is large, when the position is distorted, acting force required by manual dragging and limiting is large, workers feel fatigue easily, and the core column 6 separated from the transport gun carrier 7 after being distorted is prone to threatening the life safety of the workers;
connecting wires 211 are drawn out from the interior of a winding limiting shell 210 on two sides of a portal 1 and are connected with two sides of the outer side wall of a core column tube 6 through connectors 28 on one end of the connecting wires 211, the winding rollers 29 are adjusted after connection to keep the connecting wires 211 tight, limiting bolts 212 on the inner sides of movable limiting sliding grooves 213 limit the winding rollers 29 on a winding rotating shaft 27, a transport gun carriage 7 is started, the transport gun carriage 7 transports the core column tube 6 to move along with the traction of an electric hoist 5, a rotating shaft 22 inserted into the middle position of the electric hoist 5 through a connecting hole 23 rotates along with the rotation of the electric hoist 5, transmission rotating wheels 25 connected with the rotating shaft 22 and two ends of the winding rotating shaft 27 are transmitted through a first transmission belt 26, the rotating shaft 22 drives the winding rollers 29 on the outer side wall of the winding rotating shaft 27 to rotate, and the winding rollers 29 roll up the connecting wires 211 when the core column tube 6 moves, the radius size of the transmission runner 25 connected to one end of the winding rotating shaft 27 is smaller than the radius size of the transmission runner 25 connected to one end of the rotating shaft 22, the size proportion of the transmission runner 25 and the electric hoist 5 is in direct proportion to the length proportion of the winding roller 29, so that the connecting wire 211 is kept tight constantly and is pulled to the core column tube 6, the two sides of the core column tube 6 are pulled by the connecting wire 211 in the moving process and are not prone to generate position deflection, the pulling of the connecting wire 211 is not needed to be carried out manually, and the acting force generated when the core column tube 6 deflects cannot threaten the life safety of workers.
Example 2:
referring to fig. 4-8, the outer side wall of the electric hoist 5 is provided with a hoisting limiting mechanism 3, the hoisting limiting mechanism 3 includes a supporting frame 32, the inner side wall of the supporting frame 32 is connected with a reel 31, the reel 31 is in the shape of a regular octagon, and the length of each side of the reel 31 is greater than that of the auxiliary sliding cylinder 34, so that when the reel 31 curls the pull wire 33, the auxiliary sliding cylinders 34 connected to the outer side of the pull wire 33 are all distributed at the middle position of the outer side of the reel 31, the inner side wall of the reel 31 is connected with the pull wire 33, the outer side wall of the pull wire 33 is connected with a plurality of uniformly distributed auxiliary sliding cylinders 34, the outer side wall of the auxiliary sliding cylinders 34 is provided with a plurality of uniformly distributed ball grooves, the ball 37 is slidably connected inside the ball grooves, and the ball 37 prevents friction between the core column 6 and the pull wire 33 when moving up and down, the abrasion to the traction wire 33 is small, the lower end of the traction wire 33 is connected with a connecting buckle 36 through a connecting cylinder 35, the connecting buckle 36 is sleeved on the outer side wall of the foundation bolt support 8, the connecting buckle 36 is adsorbed on the foundation bolt support 8 through an electromagnet 38 to be fixed in position, two sides inside the connecting buckle 36 are both provided with cavities 315, the middle position of the inner lower surface of the cavity 315 at one side inside the connecting buckle 36 is connected with an elastic metal sheet 310, the upper ends of the two elastic metal sheets 310 are contacted with each other to enable a circuit to be communicated, the electromagnet 38 is supplied with power, the upper surface of the connecting buckle 36 is connected with a pressing button 39 in a sliding mode at the position corresponding to the elastic metal sheet 310, one end, corresponding to the cavity 315, of the pressing button 39 is connected with an insulating plate 311, the lower surface of the pressing button 39 is connected with a reset spring 312 close to two sides of the insulating plate 311, when the pressing button 39 is under pressure, the insulating plate 311 below the pressing button 39 is inserted between the two elastic metal sheets 310 to cut off the circuit, when the pressing button 39 is not stressed, the pressing button 39 is reset under the action of a compressed reset spring 312 to drive the insulating plate 311 to be pulled out from between the two elastic metal sheets 310, the inner side wall of the connecting buckle 36 is connected with the electromagnet 38, the cavity 315 at the other side inside the connecting buckle 36 is connected with a sliding bolt 313 in a sliding manner, one side of the outer side wall of the sliding bolt 313 close to the cavity 315 is integrally formed with a driving block 314, a worker can slide in the adjusting sliding groove through the driving block 314 to drive the sliding bolt 313 to move, so that the other end of the sliding bolt 313 reaches the other end of the connecting buckle 36, the connecting buckle is tightly adsorbed on the outer side of the other end of the connecting buckle 36 under the action of the electromagnet 38, the extension spring 316 is stretched in the moving process of the sliding bolt 313, an adjusting sliding groove is formed in the position, corresponding to the driving block 314, of the outer side wall of the connecting buckle 36, and the extension spring 316 is connected to the position, corresponding to the sliding bolt 313, of the inner side wall of the cavity 315;
in the prior art, in the process of vertically hoisting the core column 6, a limiting device is not arranged on the outer side of the core column 6, so that the suspended core column 6 is easy to shake under the action of an external force, the hoisted core column 6 is difficult to be butted with the bottom foundation bolt support 8, part of equipment is to prevent the suspended core column 6 from shaking, the core column 6 is difficult to shift greatly in position by carrying out traction limiting on the two sides of the core column 6 through traction ropes, the core column 6 is difficult to shift greatly in position, the core column 6 is limited greatly in movement in the direction of the traction ropes after the traction limiting, small-range position shifting can be carried out in other directions, the core column 6 is difficult to be butted with the bottom foundation bolt support 8 accurately, and the limiting traction ropes need to be manually unbundled after the butting is completed, which is very inconvenient;
after the core column 6 is kept stable, the control device controls the wire winder 31 to rotate and release the traction wires 33, so that the four traction wires 33 released from the inner side of the cross-shaped supporting frame 32 are uniformly kept in four directions of the outer side wall of the core column 6, the lower end of the drooping traction wire 33 can be connected to the outer side wall of the foundation bolt support 8 through the connecting buckle 36, in the process that the core column 6 is released vertically and slowly under the action of the electric hoist 5, the traction wires 33 limiting the core column 6 in the four directions are connected with the balls 37 on the auxiliary sliding cylinder 34 through the outer side wall to slide relatively with the outer side wall of the core column 6, so that the traction wires 33 and the core column 6 are not easy to rub, under the limiting action of the four traction wires 33 on the core column 6 in the four directions, the position of the core column 6, which descends to the foundation bolt support 8, can be more accurately butted with the upper end of the foundation bolt support 8, when the core column 6 descends to contact with the pressing button 39 on the upper surface of the connecting buckle 36 and presses the pressing button 39 to move to the inner side of the cavity 315, the insulating plate 311 at the middle position of the lower surface of the pressing button 39 is inserted into the middle position of the elastic metal sheet 310, so that a circuit where the elastic metal sheet 310 is located is disconnected due to the separation of the elastic metal sheet 310, the electromagnet 38 cannot absorb one end of the anchor bolt support 8 and one end of the sliding bolt 313 due to the loss of power supply, the sliding bolt 313 retracts into the cavity 315 under the action of the reset force of the stretched tension spring 316, the connecting buckle 36 is automatically separated from the anchor bolt support 8 due to the loss of power supply, and the winder 31 can slowly retract the pull wire 33 under the control of the control device.
Example 3:
referring to fig. 9-11, an anti-blocking mechanism 4 is disposed at a position corresponding to the rotating shaft 22 on the lower surface inside the door frame 1, the anti-blocking mechanism 4 includes a supporting rotating sleeve 41, a connecting frame 45 is integrally formed at positions corresponding to the door frame 1 on two sides of the outer side wall of the supporting rotating sleeve 41, the supporting rotating sleeve 41 is not prone to position shift when moving left and right under the support of the connecting frames 45 on two sides, a transmission gear 46 is rotatably connected at a middle position above the outer side wall of the supporting rotating sleeve 41, a second transmission belt 42 is connected at a side inside the supporting rotating sleeve 41 close to the outer side wall of the transmission gear 46, a lower end of the second transmission belt 42 is sleeved on an outer side wall of a rotating wheel coaxial with the transmission gear 46, an upper end of an outer side wall of the rotating wheel is connected on an outer side wall of a reciprocating screw 43 inside the supporting rotating sleeve 41, a reciprocating screw 43 is rotatably connected at a position corresponding to the second transmission belt 42 on the outer side wall of the connecting frame 45, the outer side wall of the reciprocating screw 43 is rotatably connected with a shoveling plate 44 at a position corresponding to the gantry 1, the shoveling plate 44 performs reciprocating sliding at a position on the outer side wall of the reciprocating screw 43 through an internally connected sliding part, the supporting rotating sleeve 41 is rotatably connected with a rotating wheel 49 at a position corresponding to the rotating shaft 22, the outer side wall of the rotating wheel 49 is provided with an embedding tooth socket 410 at a position corresponding to the transmission gear 46, the rotating wheel 49 is sleeved on the outer side wall of the rotating shaft 22 and rotates along with the rotation of the rotating shaft 22, the rotating wheel 49 is driven to rotate through mutual embedding of the embedding tooth socket 410 arranged at the outer side and the outer teeth of the transmission gear 46, the connecting plate 48 is integrally formed at a position corresponding to the supporting rotating sleeve 41 on the lower surface inside the gantry 1, the outer side wall of the connecting plate 48 is connected with a limiting spring 47 at a position corresponding to the supporting rotating sleeve 41, and the supporting rotating sleeve 41 performs position sliding inside the gantry 1, the limiting spring 47 is stretched, so that the limiting spring 47 can drive the supporting rotating sleeve 41 to swing back and forth on the inner side of the door frame 1 in the resetting process, and the impurity shoveling plate 44 can clear blockage in the door frame 1 in the back and forth process;
in the prior art, the electric hoist 5 needs to slide along a slideway arranged in the portal 1 during hoisting, and dust and impurities accumulated in the slideway are gradually increased during long-time use of the slideway in the portal 1, so that the electric hoist 5 is easy to be blocked when sliding at the position in the portal 1, or the electric hoist 5 moving due to impurities bumps, and the hoisted core column tube 6 is stirred greatly and deviates in position, and is difficult to mount accurately;
the rotating shaft 22 drives the two rotating wheels 49 sleeved on the two sides of the outer side wall of the rotating shaft 22 to rotate in the rotating process, the rotating wheels 49 are mutually embedded with the outer teeth of the transmission gear 46 through the embedding tooth grooves 410 on the outer side wall, the rotating wheel coaxial with the transmission gear 46 and the rotating wheel coaxial with the reciprocating lead screw 43 are driven through the second transmission belt 42, so that the rotating shaft 22 can drive the reciprocating lead screw 43 to rotate, in the rotating process of the reciprocating lead screw 43, the impurity shoveling plate 44 performs reciprocating motion under the limitation of the chute in the portal frame 1, and shovels away dust and impurities accumulated in the chute in the portal frame 1, when the electric block 5 performs position movement in the portal frame 1, the electric block 5 can contact with the reciprocating lead screw 43 and push the supporting rotating sleeve 41 connected with the reciprocating lead screw 43 to perform position movement in the portal frame 1, and the moving range of the electric block 5 in the portal frame 1 is not obstructed, make the miscellaneous board 44 of shovel to the inside scope increase of clearing up of portal 1, remove in-process spacing spring 47 and receive tensile, can drive support rotating sleeve 41 and get back to original position in the reset process, make electric block 5 can not take place to remove when carrying out the position removal in portal 1 because of impurity and hinder and remove the condition that takes place to jolt.
When the invention is used, the electric hoist 5 on the portal frame 1 is adjusted to enable the hook at the lower end of the electric hoist 5 to descend to a designated height and is connected with the connecting rope on the core column 6 placed on the transport gun carriage 7, the connected electric hoist 5 stretches the upper end of the core column 6 under the control of the control equipment, after the core column 6 is dragged by the electric hoist 5 to enable the inclination angle between the core column 6 and the transport gun carriage 7 to reach a set range, the connecting wires 211 are pulled out from the interior of the winding limiting shells 210 at two sides of the portal frame 1 and are connected with two sides of the outer side wall of the core column 6 through the connectors 28 at one end of the connecting wires 211, the connecting wires 211 are kept tight by adjusting the winding rollers 29 after connection, the limiting bolts 212 at the inner side of the movable limiting sliding grooves 213 limit the winding rollers 29 on the winding rotating shaft 27, and the transport gun carriage 7 is started, the transportation gun carrier 7 is enabled to transport the core column 6 to move along with the traction of the electric hoist 5, the rotating shaft 22 inserted into the middle position of the electric hoist 5 through the connecting hole 23 rotates along with the rotation of the electric hoist 5, the rotating shaft 22 and the transmission rotating wheel 25 connected with two ends of the winding rotating shaft 27 are driven through the first transmission belt 26, the rotating shaft 22 drives the winding roller 29 on the outer side wall of the winding rotating shaft 27 to rotate, the winding roller 29 is enabled to wind the connecting wire 211 when the core column 6 moves along with the position, and the connecting wire 211 is enabled to keep tight constantly and drag the core column 6;
after the transportation gun carrier 7 transports the core column 6 to the position of the foundation bolt support 8, the limit of the rotation of the winding roll 29 is released at the position of the inner side of the limit sliding groove 213 by the sliding limit bolt 212, when the electric hoist 5 continues to hoist and upwards pull the core column 6, a worker can manually pull the connecting wire 211 to limit the shaking generated in the hoisting and ascending process of the core column 6, after the core column 6 is kept stable, the control equipment controls the wire winder 31 to rotate and release the traction wire 33, so that the four traction wires 33 released from the inner side of the cross-shaped support frame 32 are uniformly kept in four directions of the outer side wall of the core column 6, the lower end of the drooping traction wire 33 can be connected to the outer side wall of the foundation bolt support 8 through the connecting buckle 36, then the connector 28 is disconnected from the core column 6, the transportation gun carrier 7 is removed, and the core column 6 is vertically and slowly released under the action of the electric hoist 5, the traction lines 33 for limiting the core column 6 in four directions are connected with the outer side wall of the auxiliary sliding cylinder 34 through the outer side wall to slide relatively between the ball 37 on the auxiliary sliding cylinder and the outer side wall of the core column 6, so that friction is not easy to occur between the traction lines 33 and the core column 6, after the core column 6 descends to the position of the anchor bolt support 8 and is in butt joint with the upper end of the anchor bolt support 8, the core column 6 descends along the extension direction of the anchor bolt support 8 under the limitation of the traction lines 33, when the core column 6 descends to be in contact with the pressing button 39 on the upper surface of the connecting buckle 36 and presses the pressing button 39 to move towards the inner side of the cavity 315, the insulation plate 311 at the middle position of the lower surface of the pressing button 39 is inserted into the middle position of the elastic metal sheet 310, so that a circuit where the elastic metal sheet 310 is located is disconnected due to the separation of the elastic metal sheet 310, and the electromagnet 38 loses power supply and cannot absorb one end of the anchor bolt support 8 and the sliding bolt 313, the sliding bolt 313 retracts into the cavity 315 under the action of the reset acting force of the stretched extension spring 316, the connecting buckle 36 is out of the limit and automatically separated from the anchor bolt bracket 8, and the reel 31 can slowly retract the traction line 33 under the control of the control equipment;
the rotating shaft 22 drives the two rotating wheels 49 sleeved on the two sides of the outer side wall of the rotating shaft 22 to rotate in the rotating process, the rotating wheels 49 are mutually embedded with the outer teeth of the transmission gear 46 through the embedding tooth grooves 410 on the outer side wall, the rotating wheel coaxial with the transmission gear 46 and the rotating wheel coaxial with the reciprocating lead screw 43 are driven through the second transmission belt 42, so that the rotating shaft 22 can drive the reciprocating lead screw 43 to rotate, in the rotating process of the reciprocating lead screw 43, the impurity shoveling plate 44 performs reciprocating motion under the limitation of the chute in the portal frame 1, and shovels away dust and impurities accumulated in the chute in the portal frame 1, when the electric block 5 performs position movement in the portal frame 1, the electric block 5 can contact with the reciprocating lead screw 43 and push the supporting rotating sleeve 41 connected with the reciprocating lead screw 43 to perform position movement in the portal frame 1, and the moving range of the electric block 5 in the portal frame 1 is not obstructed, make the miscellaneous board 44 of shovel to the inside scope increase of clearing up of portal 1, remove in-process spacing spring 47 and receive tensile, can drive support rotating sleeve 41 and get back to original position in the reset process, make electric block 5 can not take place to remove when carrying out the position removal in portal 1 because of impurity and hinder and remove the condition that takes place to jolt.
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 forms 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 (7)
1. The installation method for the basement steel structure is characterized by comprising the following steps:
the method comprises the following steps: encrypting axes and elevation control points on site according to original axis control points and elevation control points, measuring and releasing a central cross line and at least two elevation control points of each embedded part according to the axes released by a control line, completing measurement and paying-off operation, accurately placing a fixed support in place by using a positioning line and a level gauge, supporting the fixed support with reinforcing steel bars around a column, supporting a foundation bolt support (8) in a steel installation mechanism, well protecting the threads of an anchor bolt after the anchor bolt is installed, checking the foundation bolt support (8) when concrete is poured for the last time, finding out deviation and timely correcting, and completing embedding of the foundation bolt support (8);
step two: the vertical and horizontal axes of the column base of each core column casing (6) are discharged, after the measured axes are subjected to ink line snapping, the distance is measured to recheck the size between adjacent columns, triangular marks are made after the axes are rechecked to be correct, the triangular marks are used as a centering basis when the first section of core column casing (6) is hoisted in place, the center line and the elevation datum line of the core column casing (6) are marked at two ends of the column, each core column casing (6) is installed on the ground by taking the column top as a datum mark, the elevation control lines are at least arranged and marked on two surfaces, hoisting points are arranged at the position of a pre-welded connecting lug plate, and hoisting is carried out by adopting a special hoisting tool clamping and a single machine rotating method;
step three: adjusting an electric hoist (5) on a gantry (1), so that a hook at the lower end of the electric hoist (5) is lowered to a designated height and is connected with a connecting rope on a core column (6) placed on a transport gun carriage (7), after connection, the electric hoist (5) stretches the upper end of the core column (6) under the control of a control device, after the electric hoist (5) pulls the core column (6) to enable the inclination angle between the core column (6) and the transport gun carriage (7) to reach a set range, a connecting wire (211) is pulled out from the interior of a winding limit shell (210) at two sides of the gantry (1) and is connected with two sides of the outer side wall of the core column (6) through a connector (28) at one end of the connecting wire (211), after connection, the winding roller (29) is adjusted to keep tight, a limiting bolt (212) at the inner side of a movable limiting sliding groove (213) limits a winding roller (29) on a winding rotating shaft (27), the method comprises the steps that a transport gun carrier (7) is started, so that a transport core column (6) of the transport gun carrier (7) moves along with the traction of an electric hoist (5), a rotating shaft (22) inserted into the middle position of the electric hoist (5) through a connecting hole (23) rotates along with the rotation of the electric hoist (5), transmission rotating wheels (25) connected with two ends of the rotating shaft (22) and two ends of a winding rotating shaft (27) are transmitted through a first transmission belt (26), the rotating shaft (22) drives a winding roller (29) on the outer side wall of the winding rotating shaft (27) to rotate, the winding roller (29) rolls a connecting wire (211) when the core column (6) moves along with the position, and the connecting wire (211) keeps tight constantly and pulls the core column (6);
step four: after a transport gun carriage (7) transports a core column (6) to the position of a foundation bolt support (8), a sliding limiting bolt (212) releases the limitation on the rotation of a winding roll (29) at the position of the inner side of a limiting sliding groove (213), when an electric hoist (5) continues to hoist and upwards pull the core column (6), a worker can manually pull a connecting wire (211) to limit the shaking generated in the hoisting and lifting process of the core column (6), after the core column (6) is kept stable, a control device controls a wire winder (31) to rotate and release a traction wire (33), so that four traction wires (33) released from the inner side of a cross-shaped support frame (32) are uniformly kept in four directions of the outer side wall of the core column (6), the lower end of the drooping traction wire (33) can be connected to the outer side wall of the foundation bolt support (8) through a connecting buckle (36), the core column barrel (6) is vertically and slowly placed down under the action of the electric hoist (5), traction lines (33) which limit the core column barrel (6) in four directions are connected with the ball (37) on the auxiliary sliding barrel (34) through the outer side wall and relatively slide with the outer side wall of the core column barrel (6) in the process that the core column barrel (6) is vertically and slowly placed down, so that friction between the traction lines (33) and the core column barrel (6) is reduced, the core column barrel (6) descends to the position of the foundation bolt bracket (8) and is in butt joint with the upper end of the foundation bolt bracket (8), the core column barrel (6) descends along the extension direction of the foundation bolt bracket (8) under the limitation of the traction lines (33), and when the core column barrel (6) descends to be in contact with a press button (39) on the upper surface of a connecting buckle (36) and press the press button (39) to move to the inner side of a cavity (315), an insulating plate (311) at the middle position of the lower surface of a pressing button (39) is inserted into the middle position inside an elastic metal sheet (310), a circuit where the elastic metal sheet (310) is located is disconnected due to the separation of the elastic metal sheet (310), an electromagnet (38) loses power supply and cannot adsorb one ends of an anchor bolt support (8) and a sliding bolt (313), the sliding bolt (313) retracts into a cavity (315) under the action of the reset acting force of a stretched stretching spring (316), a connecting buckle (36) loses limitation and automatically disengages from the anchor bolt support (8), and a reel (31) can slowly retract a traction wire (33) under the control of control equipment.
2. The mounting method for the steel structure of the basement according to claim 1, wherein the steel mounting mechanism comprises a gantry (1), an electric hoist (5), a core column (6), a transportation gun carriage (7) and a foundation bolt bracket (8), the electric hoist (5) is connected to the lower surface of the interior of the gantry (1) in a sliding manner, the core column (6) is connected to the lower end of the electric hoist (5), the transportation gun carriage (7) is arranged at the lower end of the core column (6), the foundation bolt bracket (8) is arranged in the middle of the lower surface of the interior of the gantry (1), and a traction limiting mechanism (2) is arranged on the upper surface of the interior of the gantry (1);
the traction limiting mechanism (2) comprises a rotating shaft (22), the outer side wall of the electric hoist (5) corresponds to the position of the rotating shaft (22) and is provided with a connecting hole (23), limiting strips (21) are integrally formed on the two sides of the outer side wall of the rotating shaft (22), the two sides of the inner upper surface of the gantry (1) correspond to the position of the rotating shaft (22) and are connected with a support frame (24), the two sides of the outer side wall of the gantry (1) are rotatably connected with a winding rotating shaft (27), one end of the rotating shaft (22) and one end of the winding rotating shaft (27) are both connected with transmission rotating wheels (25), the two transmission rotating wheels (25) are in transmission connection through a first transmission belt (26), the two sides of the inner side wall of the gantry (1) correspond to the position of the winding rotating shaft (27) and are connected with a winding limiting shell (210), the inside of the winding limiting shell (210) corresponds to the position of the winding rotating shaft (27) and is connected with a winding roller (29), the outer side wall of the winding roller (29) is connected with a connecting wire (211), and one end, far away from the winding limiting shell (210), of the connecting wire (211) is connected with a connector (28).
3. The installation method for the basement steel structure according to claim 2, characterized in that the outer side wall of the electric hoist (5) is provided with a hoisting limiting mechanism (3);
the hoisting limiting mechanism (3) comprises a supporting frame (32), the inner side wall of the supporting frame (32) is connected with a reel (31), the inner side wall of the reel (31) is connected with a traction line (33), the outer side wall of the traction line (33) is connected with a plurality of auxiliary sliding cylinders (34) which are uniformly distributed, the lower end of the traction line (33) is connected with a connecting buckle (36) through a connecting cylinder (35), cavities (315) are respectively arranged on two sides inside the connecting buckle (36), an elastic metal sheet (310) is connected at the middle position of the inner lower surface of the cavity (315) on one side inside the connecting buckle (36), the upper surface of the connecting buckle (36) corresponds to the position of the elastic metal sheet (310) and is slidably connected with a pressing button (39), one end of the pressing button (39) corresponding to the inner part of the cavity (315) is connected with an insulating plate (311), the pressing button (39) lower surface is close to insulation board (311) both sides are connected with reset spring (312), connector link (36) inside wall is connected with electro-magnet (38), is located the inside sliding connection of cavity (315) of the inside opposite side of connector link (36) has slip bolt (313), cavity (315) inside wall corresponds slip bolt (313) position department is connected with extension spring (316).
4. The installation method for the steel structure of the basement according to the claim 2, characterized in that the inner lower surface of the gantry (1) is provided with an anti-blocking mechanism (4) corresponding to the position of the rotating shaft (22);
the anti-blocking mechanism (4) comprises a supporting rotating sleeve (41), the two sides of the outer side wall of the supporting rotating sleeve (41) correspond to the position of the portal frame (1) and are integrally formed with a connecting frame (45), the middle position above the outer side wall of the supporting rotating sleeve (41) is rotatably connected with a transmission gear (46), the supporting rotating sleeve (41) is internally close to one side of the outer side wall of the transmission gear (46) and is connected with a second transmission belt (42), the outer side wall of the connecting frame (45) corresponds to the position of the second transmission belt (42) and is rotatably connected with a reciprocating lead screw (43), the outer side wall of the reciprocating lead screw (43) corresponds to the position of the portal frame (1) and is rotatably connected with a sundry shoveling plate (44), the supporting rotating sleeve (41) internally corresponds to the position of the rotating shaft (22) and is rotatably connected with a rotating wheel (49), the outer side wall of the rotating wheel (49) corresponds to the position of the transmission gear (46) and is provided with an embedded tooth groove (410), the lower surface in the door frame (1) is provided with a connecting plate (48) at a position corresponding to the supporting rotating sleeve (41), and the outer side wall of the connecting plate (48) is connected with a limiting spring (47) at a position corresponding to the supporting rotating sleeve (41).
5. The installation method for the basement steel structure according to claim 2, wherein the winding rotating shaft (27) and one side of the outer side wall of the winding roller (29) are both provided with a limiting sliding groove (213), and a limiting bolt (212) is connected inside the limiting sliding groove (213) in a sliding manner.
6. The installation method for the steel structure of the basement according to claim 3, wherein the outer side wall of the auxiliary sliding cylinder (34) is provided with a plurality of ball grooves which are evenly distributed, balls (37) are connected in the ball grooves in a sliding manner, the reel (31) is in a regular octagon shape, and the length of each side of the reel (31) is larger than that of the auxiliary sliding cylinder (34).
7. The mounting method for the steel structure of the basement according to claim 3, wherein a driving block (314) is integrally formed on one side of the outer side wall of the sliding bolt (313) close to the inside of the cavity (315), and an adjusting sliding groove is formed on the outer side wall of the connecting buckle (36) corresponding to the position of the driving block (314).
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| CN114643117A (en) * | 2022-03-21 | 2022-06-21 | 浙江迦南科技股份有限公司 | Energy-saving wet process mixer granulator pelletization device |
| CN115492411A (en) * | 2022-10-19 | 2022-12-20 | 中铁五局集团建筑工程有限责任公司 | High-altitude cantilever steel structure unitized high-precision rapid butt joint device and butt joint method thereof |
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| CN114134993B (en) | 2023-04-07 |
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