CN116081502A - Device and method for erecting steel truss aqueduct of small-section asymmetric beam arch system - Google Patents
Device and method for erecting steel truss aqueduct of small-section asymmetric beam arch system Download PDFInfo
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- CN116081502A CN116081502A CN202211165235.7A CN202211165235A CN116081502A CN 116081502 A CN116081502 A CN 116081502A CN 202211165235 A CN202211165235 A CN 202211165235A CN 116081502 A CN116081502 A CN 116081502A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 41
- 238000009434 installation Methods 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims description 31
- 239000000725 suspension Substances 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000009432 framing Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims 3
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 230000033001 locomotion Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
- B66C1/28—Duplicate, e.g. pivoted, members engaging the loads from two sides
- B66C1/30—Duplicate, e.g. pivoted, members engaging the loads from two sides and also arranged to grip the sides of the loads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
- B66D1/38—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains by means of guides movable relative to drum or barrel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
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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
- E01D12/00—Bridges characterised by a combination of structures not covered as a whole by a single one of groups E01D2/00 - E01D11/00
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D6/00—Truss-type bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a device and a method for erecting a steel truss aqueduct of a small-section asymmetric beam arch system. And a limiting device and a three-way jack adjusting device are arranged on the rigid support, the divided small sections are lifted and installed, a matching part is arranged on the inner side of an empty box of the all-welding device, the matching part, a guide block and the like are arranged on the outer side of the empty box and are connected, a code plate is used for temporary fixing after connection, component installation is completed, lifting equipment withdraws from a bridge deck, welding personnel weld in a symmetrical mode, the rear end is welded firstly, and the lifting equipment is fixed between the installed sections, so that the front end stretches freely, and stress-free welding is achieved.
Description
Technical Field
The invention relates to the technical field of steel truss aqueduct erection, in particular to a device and a method for erecting a steel truss aqueduct of a small-section asymmetric beam arch system.
Background
At present, steel truss aqueducts are erected and are often spliced by hoisting steel beams by a crane, lifting ropes are difficult to keep neat and consistent when being wound and unwound during hoisting and erection of the crane, the hoisting stability is poor, and the following problems exist during splicing of the steel truss:
1. the prior steel beams are in a bolting structure, the geometric dimension of the field installation components is fixed, the steel beams are long thin rod pieces, the adjustable space is in millimeter level, and the adjustable space is: the length of the component is close to zero, so that the stress of the component is difficult to release;
2. in addition, the existing approximate technical scheme is that the cantilever is hoisted, the suspension arm sagging stress is required to be accurately pre-judged under the influence of metal expansion caused by heat and contraction caused by cold, the judgment of the data directly influences the overall engineering quality, and great challenges are presented to the construction level;
3. the prior art does not consider the influence of a supporting structure on the sliding of a river side slope, the horizontal component force of the supporting structure is considered as an important destructive force of foundation pit stability, the accuracy control difficulty is high in the using process of the temporary support mounting and dismounting and adjusting device, the influence of support dismounting on a structural system is not considered, and aiming at the problems, the inventor provides a device and a method for erecting a steel truss aqueduct of a small-section asymmetric beam arch system.
Disclosure of Invention
In order to solve the problems that lifting ropes are difficult to keep neat and consistent when being wound and unwound during lifting erection of a crane, the lifting stability is poor, the existing steel beams are of a bolting structure, the on-site installation components are fixed in geometric dimension and are long thin rods, and the adjustable space is in millimeter level and adjustable space: the length of the component is close to zero, the stress release of the component is difficult, in addition, the existing technical scheme is cantilever hoisting, the stress is influenced by the expansion caused by heat and contraction caused by cold of metal, the sagging stress of the cantilever is required to be accurately pre-judged, the judgment of the data directly influences the whole engineering quality, great challenges are presented to the construction level, the influence of a supporting structure on the sliding of a river slope is not considered in the prior art, the horizontal component force of the supporting structure is considered as an important destructive force of foundation pit stability, the precision control difficulty is high in the use process of a temporary support mounting and dismounting and adjusting device, and the problem of influence of the support dismounting on a structural system is not considered; the invention aims to provide a device and a method for erecting a steel truss aqueduct of a small-section asymmetric beam arch system.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a device is erect to asymmetric roof beam arched girder system steel purlin aqueduct of minor segment, includes the automobile body, install the davit on the automobile body, the hoist and mount mechanism is installed to the one end that the automobile body was kept away from to the davit, clamping mechanism is installed to hoist and mount mechanism's bottom, install winding mechanism on the automobile body, install the lifting rope between winding mechanism and the hoist and mount structure.
The preferred embodiment, hoist and mount mechanism includes the mounting box, the one end fixed mounting that the automobile body was kept away from to the davit has the mounting box, two pairs of leading wheels are installed in the rotation in the mounting box, the lifting rope slides and runs through the leading wheel, the mounting box bottom is equipped with the hanger plate, two pulleys are installed to the hanger plate internal rotation, the lifting rope passes the pulley and fixed connection davit, the couple is installed to the bottom of hanger plate, connect clamping mechanism on the couple.
The preferred embodiment, clamping machine constructs including rings, rings slip joint couple, the bottom fixed mounting of rings has two dead levers, the one end fixed connection link plate that rings was kept away from to the dead lever, fixed mounting has the guide bar between the both sides inner wall of link plate, the equal slip joint in both ends of guide bar has a slide cylinder, the screw rod has been cup jointed in the rotation between the both sides curb plate of link plate, the screw rod screw thread runs through the slide cylinder, install control mechanism between the outer wall of one end of screw rod and link plate, the bottom inner chamber slip joint of slide cylinder has grabs the board, it has a plurality of regulation holes to grab the outer wall of board, stop bolt is installed to the bottom screw thread of slide cylinder, and stop bolt joint regulation hole.
In a preferred embodiment, the control mechanism comprises a knob, one end of the screw rod penetrates through the side wall of the hanging plate and is fixedly connected with the knob, the edge of one end, far away from the screw rod, of the knob is fixedly provided with a control rod, the outer wall of the hanging plate is fixedly provided with a fixing plate, a stud penetrates through the fixing plate, the bottom of the stud is rotationally clamped with a clamping plate, and the bottom of the clamping plate and the outer wall of the knob are provided with matched stop teeth.
The preferred embodiment case, grab the board and be L type structure, and grab the activity centre gripping between the board and have the girder steel, the outer wall of girder steel is equipped with locating component, locating component includes location inserted block and location slot, the both sides outer wall of girder steel fixed mounting respectively has location inserted block and location slot, the both sides outer wall of girder steel is equal fixed mounting has the connecting plate, the activity laminating has the locking plate between the outer wall of connecting plate, pass through bolt bolting between locking plate and the connecting plate.
In a preferred implementation case, one side of the positioning insert block, which is close to the positioning slot, is of a matched arc structure, and a code plate is arranged between the outer walls of the adjacent steel beams.
In a preferred embodiment, the winding mechanism comprises a vertical plate, the top of the vehicle body is fixedly provided with the vertical plate, a winding drum is sleeved between the vertical plates in a rotating way, one motor frame is fixedly arranged on the outer wall of the vertical plate, an output shaft of the motor frame is fixedly connected with one end of the winding drum, the top of the vehicle body is fixedly provided with two fixing rings, a guide mechanism is arranged at the top of the vehicle body between the fixing rings and the vertical plate, and the lifting rope penetrates through the fixing rings and the guide mechanism and is connected with the winding drum.
The preferred embodiment, guiding mechanism includes the fixing base, fixing base fixed mounting is on the automobile body, it has two installation cavities to open in the fixing base, two all rotate in the installation cavity and cup jointed the connecting axle, half gear and worm wheel have been cup jointed to the fixed connection epaxial, slip joint has the slip frame between the installation cavity inner wall, all fixed mounting has the rack in the both sides inner wall of slip frame, rack engagement half gear, the worm has been cup jointed in the fixing base internal rotation, two worm wheels of worm engagement, the one end of worm runs through the one end of fixing base and fixedly cup joints the drive wheel, and cup joints the drive belt between the output shaft of drive wheel and motor.
A method for erecting a steel truss aqueduct of a small-section asymmetric beam arch system comprises the following steps:
s1, preparation of construction technology: selecting proper hoisting equipment according to the operation space of the aqueduct and the bridge structure, and dividing the steel girder units;
s2, foundation pit and support foundation engineering: according to the characteristics of the bottom layer, excavating in layers, and constructing a support foundation step by step;
s3, monitoring stability of the foundation pit: immediately setting monitoring points after excavation and forming of the foundation pit, wherein monitoring contents comprise slope displacement, landslide trend, water level and the like;
s4, constructing a substructure of the foundation of the side pier and the main pier;
s5, installing a permanent support according to the designed position, grouting and solidifying the permanent support on the filler stone, and limiting and locking the support;
s6, bracket installation: the hoisting equipment constructs a steel pipe bracket on the side pier bearing platform according to a fishing method;
s7, small-section component installation: a limiting device and a three-way jack adjusting device are arranged on the rigid support, the divided small sections are lifted and arranged, a matching part is arranged on the inner side of an empty box of the all-welding device, a matching part, a guide block and the like are arranged on the outer side of the empty box of the all-welding device and are connected, and after connection, the small sections are temporarily fixed by using a code plate, so that component installation is completed;
s8, stress-free welding: lifting equipment withdraws from the bridge deck, welding personnel weld in a symmetrical mode, and weld the 'rear end' firstly and fix the 'rear end' to the installed internode, so that the front end can freely stretch and retract to achieve stress-free welding;
s9, using the completed section as a hoisting platform, and installing the upper structure of the steel pipe bracket by a fishing method;
s10, repeating the steps S7, S8 and S9 until the arch chord region member is installed;
s11, installing a side span arch chord member: firstly, installing a horizontal and vertical limiting on a fixed support, firstly installing an arch chord member according to the limiting, and then installing a chord member after the arch chord part is welded;
s12, side span closure: the main pier support is installed in advance, the support is locked to form a hinge point, the installation of related components on the top of the main pier is completed by repeating the step S11, the limit of the side pier support is unlocked before welding, and the primary system conversion is completed;
s13, repeating the steps S6, S7 and S8 to enable the bridge to be continuously close to the main pier in the closure direction from the side piers, wherein the middle main pier is fixedly hinged in the full bridge state before closure, the two ends of the full bridge are in asymmetric unequal length and freely stretch, and the asymmetric structure is supported by virtue of a full framing;
s14, midspan closure: measuring the deformation quantity of the middle span caused by temperature influence in advance between two joints before closure, preparing for full-bridge closure, finishing line type error correction through 2-3 small-section joints, selecting proper time for closure, sequentially closing according to the sequence of lower chord, upper chord, bottom plate and side wall plate, and releasing the limit of a main pier support after closure welding is finished;
s15, dismantling a bracket: the support is dismantled step by step according to the symmetry principle, the middle of the main pier is dismantled firstly, then the side pier is dismantled symmetrically, finally the side pier is dismantled near the main pier, and anti-overturning measures are needed near the main pier.
In a preferred embodiment, the method for hoisting the steel beam 7 by using the hoisting device comprises the following steps:
step one: unscrewing the stud, enabling the clamping plate to be far away from the knob, disengaging the stop teeth, rotating the knob through the control rod, driving the screw rod to rotate, adjusting the position of the sliding frame, enabling the grabbing plate to slide along the sliding frame and be locked through the locking bolt, enabling the steel beam to be grabbed through the grabbing plate, screwing the stud, enabling the clamping plate to be meshed with the stop teeth between the knob, enabling the sliding frame to be fixed, and achieving the purpose of stably clamping the steel beam;
step two: when the steel beam is lifted by the suspension arm, the motor drives the winding drum to rotate, so that the lifting ropes are wound and unwound, the two lifting ropes drive the lifting plates to lift through the guide wheels and the pulleys, lifting and pulling away are provided through the plurality of lifting ropes, lifting stability is improved, when the lifting ropes are wound and unwound, the motor synchronously drives the worm to rotate through the transmission belt, the worm drives the worm wheel to rotate, the worm wheel drives the half gear to rotate through the connecting shaft, the half gear rotates to be engaged with racks on two sides of the sliding frame alternately, reciprocating movement of the sliding frame is realized, and then the sliding frame drives the guide sleeve to reciprocate, so that the lifting ropes are wound and unwound on the winding drum one by one, and power stability is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the hoisting equipment constructs a steel pipe bracket on a side pier bearing platform according to a fishing method, a limiting device and a three-way jack adjusting device are arranged on a rigid bracket, small segments which are divided are hoisted and installed, a matching part is arranged on the inner side of an empty box of a full welding device, a matching part, a guide block and the like are arranged on the outer side of the empty box of the full welding device, the matching part and the guide block are connected, a code plate is used for temporary fixation after the connection, the installation of a component is completed, the hoisting equipment withdraws from a bridge deck, welding personnel adopt a symmetrical mode for welding, the welding personnel weld the rear end at first and fix the rear end to the installed segments, so that the front end stretches freely, and the stress-free welding is achieved;
2. firstly, installing horizontal and vertical limiting on a fixed support, installing a chord member according to the limiting, installing a chord member after welding, installing a chord member again after finishing welding, installing in advance to finish a main pier support, locking the support to form a hinge point, finishing the installation of a main pier top related member, unlocking the side pier support for limiting before welding, finishing one-time system conversion, measuring the temperature influence deformation quantity in advance between two joints before mid-span closure, preparing for full-bridge closure, finishing line type error correction between 2-3 small-section joints, selecting proper time for closure, sequentially closing according to the sequence of lower chord, upper chord, bottom plate and side wall plate, releasing the limit of the main pier support after closure welding, counteracting stress through small-section symmetrical construction, and reducing error;
3. during hoisting, the motor drives the winding drum to rotate, thereby receive and release lifting ropes, two lifting ropes drive the hanger plate through leading wheel and pulley and go up and down, provide hoist and mount through stranded lifting rope and pull away, improve hoist and mount stability, when lifting rope receive and release, the motor drives the worm through the drive belt is synchronous, the worm drives the worm wheel rotation, the worm wheel drives half gear through the connecting axle and rotates, then half gear rotates the rack of meshing slip frame both sides in turn, realize slip frame reciprocating motion, then slip frame drive uide bushing reciprocating motion, thereby make the lifting rope receive and release on the winding drum by turns, improve dynamic stability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a 1/2 segment division structure of a main girder of the present invention.
Fig. 2 to 5 are schematic views of foundation pit and support foundation engineering structures according to the present invention.
Fig. 6 is a schematic diagram of a foundation pit stability monitoring structure according to the present invention.
FIG. 7 is a construction view of a substructure of a side pier, main pier foundation;
FIG. 8 is a permanent seat installation view;
FIG. 9 is a bracket mounting view;
FIGS. 10-11 are small section component mounting views;
FIG. 12 is a view showing the construction of the upper part of the steel pipe bracket;
FIG. 13 is a construction view of an installation of a component into the chorded area;
FIG. 14 is a construction drawing of a side span arch chord member installation;
FIG. 15 is a side span closure construction view;
FIG. 16 is a mid-span closure construction view;
fig. 17 to 19 are construction views showing the removal of the bracket;
FIG. 20 is a schematic view of a hoisting device according to the present invention;
FIG. 21 is a schematic view of the structure of the hoisting mechanism of the present invention;
FIG. 22 is a schematic view of the structure of the clamping mechanism according to the present invention;
FIG. 23 is an enlarged schematic view of the structure of FIG. 22B according to the present invention;
FIG. 24 is an enlarged schematic view of the structure of FIG. 20A according to the present invention;
FIG. 25 is a schematic view showing a partial structure of a guide mechanism of the present invention;
FIG. 26 is a schematic view showing a partial structure of a screw of the present invention;
FIG. 27 is an enlarged schematic view of the structure of FIG. 11C according to the present invention;
in the figure: 1. a vehicle body; 2. a suspension arm; 3. a hoisting mechanism; 31. a mounting box; 32. a guide wheel; 33. a hanger plate; 34. a hook; 35. a pulley; 4. a hanging rope; 5. clamping mechanism; 51. a hanging ring; 52. a fixed rod; 53. a hanging plate; 54. a guide rod; 55. a screw; 56. a control mechanism; 561. a knob; 562. a control lever; 563. a fixing plate; 564. a stud; 565. a clamping plate; 566. a stop tooth; 57. a sliding cylinder; 58. grabbing a plate; 59. an adjustment aperture; 6. a winding mechanism; 61. a vertical plate; 62. a motor frame; 63. a motor; 64. winding up a winding drum; 65. a fixing ring; 66. a guide mechanism; 661. a fixing seat; 662. a mounting cavity; 663. a sliding frame; 664. a rack; 665. a connecting shaft; 666. a half gear; 667. a worm wheel; 668. a guide sleeve; 669. a worm; 7. a steel beam; 8. a positioning assembly; 81. positioning the insert block; 82. positioning the slot; 83. a connecting plate; 84. a locking plate; 85. code board
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples: as shown in fig. 1-27, the invention provides a device for erecting a steel truss aqueduct of a small-section asymmetric beam arch system, which comprises a vehicle body 1, wherein a suspension arm 2 is arranged on the vehicle body 1, one end of the suspension arm 2, which is far away from the vehicle body 1, is provided with a hoisting mechanism 3, the bottom of the hoisting mechanism 3 is provided with a clamping mechanism 5, a winding mechanism 6 is arranged on the vehicle body 1, and a lifting rope 4 is arranged between the winding mechanism 6 and the hoisting structure 3.
Further, the hoisting mechanism 3 comprises a mounting box 31, one end of the suspension arm 2 far away from the vehicle body 1 is fixedly provided with the mounting box 31, two pairs of guide wheels 32 are rotatably mounted in the mounting box 31, the lifting rope 4 penetrates through the guide wheels 32 in a sliding mode, a lifting plate 33 is arranged at the bottom of the mounting box 31, two pulleys 35 are rotatably mounted in the lifting plate 33, the lifting rope 4 penetrates through the pulleys 35 and is fixedly connected with the suspension arm 2, a hook 34 is mounted at the bottom of the lifting plate 33, and the hook 34 is connected with the clamping mechanism 5.
Through above-mentioned technical scheme, through a plurality of leading wheels 32 and pulley 35 direction lifting rope 4, realize the stable direction lift to hanger plate 33, be convenient for hoist and mount.
Further, the clamping mechanism 5 comprises a lifting ring 51, the lifting ring 51 is in sliding clamping connection with the hook 34, two fixing rods 52 are fixedly arranged at the bottom of the lifting ring 51, one ends of the fixing rods 52, which are far away from the lifting ring 51, are fixedly connected with a hanging plate 53, guide rods 54 are fixedly arranged between inner walls of two sides of the hanging plate 53, two ends of the guide rods 54 are in sliding connection with sliding cylinders 57, screws 55 are rotatably sleeved between side plates of two sides of the hanging plate 53, the screws 55 penetrate through the sliding cylinders 57 in threads, an operating mechanism 56 is arranged between one end of each screw 55 and the outer wall of the hanging plate 53, a grabbing plate 58 is in sliding connection with an inner cavity of the bottom of the sliding cylinder 57, a plurality of adjusting holes 59 are formed in the outer wall of the grabbing plate 58, stop bolts are arranged at the bottom of the sliding cylinders 57 in a threaded mode, and the stop bolts are in clamping connection with the adjusting holes 59.
Further, the control mechanism 56 includes a knob 561, one end of the screw 55 penetrates through the side wall of the hanging plate 53 and is fixedly connected with the knob 561, a control rod 562 is fixedly installed at the edge of one end, far away from the screw 55, of the knob 561, a fixing plate 563 is fixedly installed on the outer wall of the hanging plate 53, a stud 564 is penetrated through the fixing plate 563 in a threaded manner, a clamping plate 565 is clamped at the bottom of the stud 564 in a rotating manner, and matched stop teeth 566 are arranged at the bottom of the clamping plate 565 and the outer wall of the knob 561.
Through the above technical scheme, unscrewing the stud 564, enabling the clamping plate 565 to be far away from the knob 561, disengaging the stop teeth 566, rotating the knob 561 through the control rod 562, driving the screw 55 to rotate, adjusting the position of the sliding barrel 57, sliding the grabbing plate 58 along the sliding barrel 57 and locking through the locking bolt, thereby grasping the steel beam 7 through the grabbing plate 58, screwing the stud 564, engaging the stop teeth 566 between the clamping plate 565 and the knob 561, thereby fixing the sliding barrel 57, and achieving the purpose of stably clamping the steel beam 7.
Further, the grabbing plate 58 is of an L-shaped structure, the steel beam 7 is movably clamped between the grabbing plates 58, the outer wall of the steel beam 7 is provided with a positioning assembly 8, the positioning assembly 8 comprises a positioning insert 81 and a positioning slot 82, the positioning insert 81 and the positioning slot 82 are fixedly installed on the outer walls of two sides of the steel beam 7 respectively, a connecting plate 83 is fixedly installed on the outer walls of two sides of the steel beam 7, a locking plate 84 is movably attached between the outer walls of the connecting plate 83, and the locking plate 84 is bolted with the connecting plate 83 through bolts.
Further, the adjacent side of the positioning insert block 81 and the positioning slot 82 is of a matched arc structure, and a code plate 85 is arranged between the outer walls of the adjacent steel beams 7.
Through above-mentioned technical scheme, after the hoist and mount of girder steel 7 are laminated, horizontal and vertical direction pass through the location inserted block 81 and the location slot 82 joint location of laminating face, realize the girder steel location, and connecting plate 83 aligns, and is fixed in advance through locking plate 84 and code plate 85, is convenient for follow-up regulation and welding.
Further, the winding mechanism 6 includes a vertical plate 61, the top of the vehicle body 1 is fixedly provided with the vertical plate 61, a winding drum 64 is rotatably sleeved between the vertical plates 61, a motor frame 62 is fixedly arranged on the outer wall of one vertical plate 61, an output shaft of the motor frame 62 is fixedly connected with one end of the winding drum 64, two fixing rings 65 are fixedly arranged on the top of the vehicle body 1, a guide mechanism 66 is arranged on the top of the vehicle body 1 between the fixing rings 65 and the vertical plates 61, and the lifting rope 4 penetrates through the fixing rings 65 and the guide mechanism 66 to be connected with the winding drum 64.
Further, the guiding mechanism 66 includes a fixing seat 661, the fixing seat 661 is fixedly installed on the vehicle body 1, two installation cavities 662 are opened in the fixing seat 661, a connecting shaft 665 is rotatably sleeved in the two installation cavities 662, a half gear 666 and a worm gear 667 are fixedly sleeved on the connecting shaft 665, a sliding frame 663 is fixedly clamped between inner walls of the installation cavities 662, racks 664 are fixedly installed on inner walls of two sides of the sliding frame 663, the racks 664 are meshed with the half gear 666, a worm 669 is rotatably sleeved in the fixing seat 661, the worm 669 is meshed with the two worm gears 667, one end of the worm 669 penetrates through one end of the fixing seat 661 and is fixedly sleeved with a driving wheel, and a driving belt is sleeved between the driving wheel and an output shaft of the motor 63.
Through the above technical scheme, when the steel beam 7 is lifted by the suspension arm 2, the motor 63 drives the winding drum 64 to rotate, so that the lifting ropes 4 are wound and unwound, the lifting plates 33 are driven to lift by the two lifting ropes 4 through the guide wheels 32 and the pulleys 35, lifting and pulling away are provided by the plurality of lifting ropes 4, lifting stability is improved, when the lifting ropes 4 are wound and unwound, the motor 63 synchronously drives the worm 669 to rotate through the transmission belt, the worm 669 drives the worm wheel 667 to rotate, the worm wheel 667 drives the half gear 666 to rotate through the connecting shaft 665, the half gear 666 rotates to be alternately meshed with the racks 664 on two sides of the sliding frame 663, the sliding frame 663 reciprocates, and the sliding frame 663 drives the guide sleeve 668 to reciprocate, so that the lifting ropes 4 are wound and unwound on the winding drum 64 one by one, and power stability is improved.
A method for erecting a steel truss aqueduct of a small-section asymmetric beam arch system comprises the following steps:
s1, preparation of construction technology: selecting proper hoisting equipment according to the operation space of the aqueduct and the bridge structure, and dividing the steel girder units;
s2, foundation pit and support foundation engineering: according to the characteristics of the bottom layer, excavating in layers, and constructing a support foundation step by step;
s3, monitoring stability of the foundation pit: immediately setting monitoring points after excavation and forming of the foundation pit, wherein monitoring contents comprise slope displacement, landslide trend, water level and the like;
s4, constructing a substructure of the foundation of the side pier and the main pier;
s5, installing a permanent support according to the designed position, grouting and solidifying the permanent support on the filler stone, and limiting and locking the support;
s6, bracket installation: the hoisting equipment constructs a steel pipe bracket on the side pier bearing platform according to a fishing method;
s7, small-section component installation: a limiting device and a three-way jack adjusting device are arranged on the rigid support, the divided small sections are lifted and arranged, a matching part is arranged on the inner side of an empty box of the all-welding device, a matching part, a guide block and the like are arranged on the outer side of the empty box of the all-welding device and are connected, and after connection, the small sections are temporarily fixed by using a code plate, so that component installation is completed;
s8, stress-free welding: lifting equipment withdraws from the bridge deck, welding personnel weld in a symmetrical mode, and weld the 'rear end' firstly and fix the 'rear end' to the installed internode, so that the front end can freely stretch and retract to achieve stress-free welding;
s9, using the completed section as a hoisting platform, and installing the upper structure of the steel pipe bracket by a fishing method;
s10, repeating the steps S7, S8 and S9 until the arch chord region member is installed;
s11, installing a side span arch chord member: firstly, installing a horizontal and vertical limiting on a fixed support, firstly installing an arch chord member according to the limiting, and then installing a chord member after the arch chord part is welded;
s12, side span closure: the main pier support is installed in advance, the support is locked to form a hinge point, the installation of related components on the top of the main pier is completed by repeating the step S11, the limit of the side pier support is unlocked before welding, and the primary system conversion is completed;
s13, repeating the steps S6, S7 and S8 to enable the bridge to be continuously close to the main pier in the closure direction from the side piers, wherein the middle main pier is fixedly hinged in the full bridge state before closure, the two ends of the full bridge are in asymmetric unequal length and freely stretch, and the asymmetric structure is supported by virtue of a full framing;
s14, midspan closure: measuring the deformation quantity of the middle span caused by temperature influence in advance between two joints before closure, preparing for full-bridge closure, finishing line type error correction through 2-3 small-section joints, selecting proper time for closure, sequentially closing according to the sequence of lower chord, upper chord, bottom plate and side wall plate, and releasing the limit of a main pier support after closure welding is finished;
s15, dismantling a bracket: the support is dismantled step by step according to the symmetry principle, the middle of the main pier is dismantled firstly, then the side pier is dismantled symmetrically, finally the side pier is dismantled near the main pier, and anti-overturning measures are needed near the main pier.
Further, the method for hoisting the steel beam 7 by the hoisting equipment comprises the following steps:
step one: unscrewing the stud 564 to separate the clamping plate 565 from the knob 561, disengaging the stop teeth 566, rotating the knob 561 through the control rod 562 to drive the screw 55 to rotate, thereby adjusting the position of the sliding frame 57, sliding the grabbing plate 58 along the sliding frame 57 and locking the grabbing plate by the locking bolt, thereby grasping the steel beam 7 through the grabbing plate 58, screwing the stud 564, and engaging the clamping plate 565 with the stop teeth 566 between the knob 561, thereby fixing the sliding frame 57 and achieving the purpose of stably clamping the steel beam 7;
step two: when the steel beam 7 is lifted by the lifting arm 2, the motor 63 drives the winding drum 64 to rotate, so that the lifting ropes 4 are wound and unwound, the lifting plates 33 are driven to lift by the two lifting ropes 4 through the guide wheels 32 and the pulleys 35, lifting and pulling away are provided by the plurality of lifting ropes 4, lifting stability is improved, when the lifting ropes 4 are wound and unwound, the motor 63 synchronously drives the worm 669 to rotate through the transmission belt, the worm 669 drives the worm wheel 667 to rotate, the worm wheel 667 drives the half gear 666 to rotate through the connecting shaft 665, the half gear 666 rotates to be alternately meshed with the racks 664 on two sides of the sliding frame 663, the sliding frame 663 reciprocates, the sliding frame 663 drives the guide sleeve 668 to reciprocate, and accordingly the lifting ropes 4 are wound and unwound on the winding drum 64 in a circle-by-circle mode, and power stability is improved.
Working principle: the hoisting equipment constructs a steel pipe bracket according to a fishing method on a side pier bearing platform, a limiting device and a three-way jack adjusting device are arranged on a rigid bracket, the small segments which are divided are hoisted and installed, a matching part is arranged on the inner side of a blank box of a full welding device, a matching part, a guide block and the like are arranged on the outer side of the blank box and are connected, a code plate is used for temporary fixation after the connection, the component installation is completed, the hoisting equipment withdraws from the bridge deck, a welder adopts a symmetrical mode for welding, firstly welds a 'rear end', is fixed between the installed joints, enables the front end to freely stretch out and draw back, realizes stress-free welding, firstly installs horizontal and vertical limiting on a fixed bracket, firstly installs a chord member according to the limiting, then installs a chord member after the welding is completed, completes a main pier support in advance, and the locking support forms a hinge point, and the step S11 is repeated to complete the installation of relevant components on the main pier top, unlocking the limit pier support before welding to complete one-time system conversion, measuring the deformation quantity of temperature influence in advance between two joints before mid-span closure, preparing for full-bridge closure, finishing line type error correction through 2-3 small-section joints, selecting proper time for closure, sequentially closing according to the sequence of lower chord, upper chord, bottom plate and side wall plate, releasing the limit pier support after closure welding is finished, counteracting stress through small-section symmetrical construction, and driving a winding drum 64 to rotate during lifting, thereby winding and unwinding lifting ropes 4, driving lifting plates 33 to lift through guide wheels 32 and pulleys 35 by two lifting ropes 4, providing lifting and pulling through a plurality of lifting ropes 4, improving lifting stability, driving worm 669 to rotate through a transmission belt synchronously when lifting ropes 4 are wound and unwound, driving worm 667 to rotate through worm 669, driving worm 667 to rotate half gears 666 through a connecting shaft 665, the half gears 666 rotate to be alternately meshed with the racks 664 on two sides of the sliding frame 663, so that the sliding frame 663 can reciprocate, and the sliding frame 663 drives the guide sleeve 668 to reciprocate, so that the lifting rope 4 is wound and unwound on the winding drum 64 circle by circle, and the power stability is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The utility model provides a device is erect to asymmetric roof beam arched girder system steel truss bridge aqueduct of minor segment, includes automobile body (1), install davit (2), its characterized in that on automobile body (1): the lifting mechanism is characterized in that one end, far away from the vehicle body (1), of the suspension arm (2) is provided with a lifting mechanism (3), the bottom of the lifting mechanism (3) is provided with a clamping mechanism (5), the vehicle body (1) is provided with a winding mechanism (6), and a lifting rope (4) is arranged between the winding mechanism (6) and the lifting mechanism (3).
2. The steel truss aqueduct erection device of the small-segment asymmetric girder arch system according to claim 1, wherein the hoisting mechanism (3) comprises a mounting box (31), one end of the suspension arm (2) far away from the car body (1) is fixedly provided with the mounting box (31), two pairs of guide wheels (32) are rotatably arranged in the mounting box (31), the hoisting ropes (4) penetrate through the guide wheels (32) in a sliding mode, a hoisting plate (33) is arranged at the bottom of the mounting box (31), two pulleys (35) are rotatably arranged in the hoisting plate (33), the hoisting ropes (4) penetrate through the pulleys (35) and are fixedly connected with the suspension arm (2), hooks (34) are arranged at the bottom of the hoisting plate (33), and the clamping mechanism (5) is connected to the hooks (34).
3. The steel truss flume erection device of the small-section asymmetric girder arch system according to claim 2, wherein the clamping mechanism (5) comprises a lifting ring (51), the lifting ring (51) is connected with a hook (34) in a sliding clamping manner, two fixing rods (52) are fixedly arranged at the bottom of the lifting ring (51), one ends of the fixing rods (52) away from the lifting ring (51) are fixedly connected with a hanging plate (53), guide rods (54) are fixedly arranged between inner walls of two sides of the hanging plate (53), sliding barrels (57) are connected with two ends of the guide rods (54) in a sliding manner, a screw rod (55) is sleeved between side plates of the two sides of the hanging plate (53) in a rotating manner, threads of the screw rod (55) penetrate through the sliding barrels (57), an operating mechanism (56) is arranged between one end of the screw rod (55) and the outer wall of the hanging plate (53), a grabbing plate (58) is connected with an inner cavity of the bottom of the sliding barrels (57) in a sliding manner, a plurality of adjusting holes (59) are formed in the outer wall of the grabbing plate (58), and bolts (59) are connected with stop bolts in a threaded manner.
4. A steel truss aqueduct erection device of a small-segment asymmetric girder arch system as defined in claim 3, wherein the control mechanism (56) comprises a knob (561), one end of the screw rod (55) penetrates through the side wall of the hanging plate (53) and is fixedly connected with the knob (561), the knob (561) is fixedly provided with a control rod (562) far away from the edge of one end of the screw rod (55), the outer wall of the hanging plate (53) is fixedly provided with a fixing plate (563), a stud (564) penetrates through the fixing plate (563) in a threaded manner, a clamping plate 5 (65) is rotatably clamped at the bottom of the stud (564), and matched stop teeth 5 (66) are arranged at the bottom of the clamping plate 5 (65) and the outer wall of the knob (561).
5. The steel truss aqueduct erection device of the small-segment asymmetric girder arch system of claim 4, wherein the grabbing plates (58) are of an L-shaped structure, steel girders (7) are movably clamped between the grabbing plates (58), positioning assemblies (8) are arranged on the outer walls of the steel girders (7), the positioning assemblies (8) comprise positioning inserting blocks (81) and positioning slots (82), the positioning inserting blocks (81) and the positioning slots (82) are respectively fixedly arranged on the outer walls of two sides of the steel girders (7), connecting plates (83) are fixedly arranged on the outer walls of two sides of the steel girders (7), locking plates (84) are movably attached between the outer walls of the connecting plates (83), and the locking plates (84) are connected with the connecting plates (83) in a bolt-locking mode.
6. The steel truss aqueduct erection device of the small-section asymmetric girder arch system according to claim 5, wherein one side, close to the positioning inserting block (81) and the positioning inserting groove (82), is of a matched arc-shaped structure, and a code plate (85) is arranged between the outer walls of adjacent steel girders (7).
7. The steel truss aqueduct erection device of the small-segment asymmetric girder arch system according to claim 1, wherein the rolling mechanism (6) comprises vertical plates (61), the top of the car body (1) is fixedly provided with the vertical plates (61), rolling cylinders (64) are sleeved between the vertical plates (61) in a rotating mode, one outer wall of each vertical plate (61) is fixedly provided with a motor frame (62), an output shaft of each motor frame (62) is fixedly connected with one end of each receiving roll (64), the top of the car body (1) is fixedly provided with two fixing rings (65), a guide mechanism (66) is arranged at the top of the car body (1) between each fixing ring (65) and each vertical plate (61), and the lifting ropes (4) penetrate through the fixing rings (65) and the guide mechanism (66) and are connected with the rolling cylinders (64).
8. The steel truss bridge aqueduct erection device of the small-segment asymmetric girder arch system according to claim 7, wherein the guide mechanism (66) comprises a fixed seat (661), the fixed seat (661) is fixedly installed on a vehicle body (1), two installation cavities (662) are formed in the fixed seat (661), connecting shafts (665) are rotatably sleeved in the two installation cavities (662), a half gear (666) and a worm wheel (667) are fixedly sleeved on the connecting shafts (665), sliding frames (663) are fixedly clamped between inner walls of the installation cavities (662), racks (664) are fixedly installed on inner walls of two sides of the sliding frames (663), the racks (664) are meshed with the half gears (666), worms (669) are rotatably sleeved in the fixed seat (661), one ends of the worms (669) penetrate through one ends of the fixed seat (661) and are fixedly sleeved with connecting shafts, and a transmission belt is sleeved between a transmission wheel and an output shaft of the transmission wheel and the motor (63).
9. The method for erecting the steel truss bridge aqueduct of the small-section asymmetric beam arch system is characterized by comprising the following steps of:
s1, preparation of construction technology: selecting proper hoisting equipment according to the operation space of the aqueduct and the bridge structure, and dividing the steel girder units;
s2, foundation pit and support foundation engineering: according to the characteristics of the bottom layer, excavating in layers, and constructing a support foundation step by step;
s3, monitoring stability of the foundation pit: immediately setting monitoring points after excavation and forming of the foundation pit, wherein monitoring contents comprise slope displacement, landslide trend, water level and the like;
s4, constructing a substructure of the foundation of the side pier and the main pier;
s5, installing a permanent support according to the designed position, grouting and solidifying the permanent support on the filler stone, and limiting and locking the support;
s6, bracket installation: the hoisting equipment constructs a steel pipe bracket on the side pier bearing platform according to a fishing method;
s7, small-section component installation: a limiting device and a three-way jack adjusting device are arranged on the rigid support, the divided small sections are lifted and arranged, a matching part is arranged on the inner side of an empty box of the all-welding device, a matching part, a guide block and the like are arranged on the outer side of the empty box of the all-welding device and are connected, and after connection, the small sections are temporarily fixed by using a code plate, so that component installation is completed;
s8, stress-free welding: lifting equipment withdraws from the bridge deck, welding personnel weld in a symmetrical mode, and weld the 'rear end' firstly and fix the 'rear end' to the installed internode, so that the front end can freely stretch and retract to achieve stress-free welding;
s9, using the completed section as a hoisting platform, and installing the upper structure of the steel pipe bracket by a fishing method;
s10, repeating the steps S7, S8 and S9 until the arch chord region member is installed;
s11, installing a side span arch chord member: firstly, installing a horizontal and vertical limiting on a fixed support, firstly installing an arch chord member according to the limiting, and then installing a chord member after the arch chord part is welded;
s12, side span closure: the main pier support is installed in advance, the support is locked to form a hinge point, the installation of related components on the top of the main pier is completed by repeating the step S11, the limit of the side pier support is unlocked before welding, and the primary system conversion is completed;
s13, repeating the steps S6, S7 and S8 to enable the bridge to be continuously close to the main pier in the closure direction from the side piers, wherein the middle (main pier) is fixedly hinged in the full bridge state before closure, the two ends of the full bridge are asymmetric and unequal in length and freely stretch out and draw back, and the asymmetric structure is supported by virtue of a full framing;
s14, midspan closure: measuring the deformation quantity of the middle span caused by temperature influence in advance between two joints before closure, preparing for full-bridge closure, finishing line type error correction through 2-3 small-section joints, selecting proper time for closure, sequentially closing according to the sequence of lower chord, upper chord, bottom plate and side wall plate, and releasing the limit of a main pier support after closure welding is finished;
s15, dismantling a bracket: the support is dismantled step by step according to the symmetry principle, the middle of the main pier is dismantled firstly, then the side pier is dismantled symmetrically, finally the side pier is dismantled near the main pier, and anti-overturning measures are needed near the main pier.
10. A method for erecting a steel truss girder aqueduct of a small-segment asymmetric girder arch system according to claim 9, characterized in that the method for hoisting the steel girder (7) by the hoisting device comprises the following steps:
step one: unscrewing the stud (564) to enable the clamping plate (565) to be far away from the knob (561), disengaging the stop teeth (566), rotating the knob (561) through the control rod (562) to drive the screw rod (55) to rotate, thereby adjusting the position of the sliding cylinder (57), sliding the grabbing plate (58) along the sliding cylinder (57) and locking the sliding cylinder through the locking bolt, thereby grasping the steel beam (7) through the grabbing plate (58), screwing the stud (564), engaging the stop teeth (566) between the clamping plate (565) and the knob (561), and fixing the sliding cylinder (57) to achieve the purpose of stably clamping the steel beam (7);
step two: when the steel beam (7) is lifted by the suspension arm (2), the motor (63) drives the winding drum (64) to rotate, thereby winding and unwinding the suspension ropes (4), the suspension plates (33) are driven to lift by the two suspension ropes (4) through the guide wheels (32) and the pulleys (35), lifting and unwinding are provided by the multi-strand suspension ropes (4), lifting stability is improved, when the suspension ropes (4) are wound and unwound, the motor (63) synchronously drives the worm (669) to rotate through the transmission belt, the worm (669) drives the worm wheel (667) to rotate, the worm wheel (667) drives the half gear (666) to rotate through the connecting shaft (665), then the half gear (666) rotates to be alternately meshed with racks (664) on two sides of the sliding frame (663), the sliding frame (663) moves reciprocally, the sliding frame (663) drives the guide sleeve (668) to reciprocate, and accordingly the suspension ropes (4) are wound and unwound on the winding drum (64) one by one, and power stability is improved.
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