CN208454312U - A kind of device measuring derrick crane verticality - Google Patents
A kind of device measuring derrick crane verticality Download PDFInfo
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- CN208454312U CN208454312U CN201821213284.2U CN201821213284U CN208454312U CN 208454312 U CN208454312 U CN 208454312U CN 201821213284 U CN201821213284 U CN 201821213284U CN 208454312 U CN208454312 U CN 208454312U
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- derrick crane
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Abstract
The utility model discloses a kind of devices for measuring derrick crane verticality, including the radiating laser beams device being mounted on derrick crane, Vertical Launch goes out laser beam to radiating laser beams device to the ground, it is provided with the positioning plate that can be irradiated to by laser beam on the ground, XOY coordinate system is provided on positioning plate, and along in XOY coordinate system X-axis and Y-axis be provided with graduation mark, when the verticality of derrick crane meets design requirement, the origin in XOY coordinate system is irradiated to the position on positioning plate with laser beam and is overlapped.In the utility model, by the positioning plate with corresponding coordinate system of setting, in the maintenance of derrick crane, can Rapid reading go out its offset distance be in radiating laser beams device at sustained height, then convenient for subsequent maintenance.For the device for observing column crane mast section outer wall deviation by instrument eyepiece in existing derrick crane verticality measurement device, reading is more accurate, intuitive.
Description
Technical field
The utility model relates to engineering equipment detection device fields, and in particular to a kind of measurement derrick crane verticality
Device.
Background technique
Derrick crane abbreviation tower crane originates from West Europe.Derrick crane working space is big, is mainly used for building construction and applies
The vertically and horizontally conveying and the installation of building element of material in work.Derrick crane is by metal structure, operating mechanism and electrical
System three parts composition.Metal structure includes tower body, swing arm and pedestal etc..There are raising, luffing, revolution and walking four in operating mechanism
Part.Electrical system includes motor, controller, power distribution cabinet, connection line, signal and lighting device etc..
Derrick crane is the machinery of prevailing traffic used in construction, especially derrick crane because it plays raising
Degree, the features such as lifting capacity is big and work range is big are using more hoisting machinery in current construction, but due to tower
Crane structure is huge, and center of gravity is high, and with high altitude operation.With the progress of wind-force and lifting operation, derrick crane
It can be gradually deviated from predetermined position under external force, the verticality of derrick crane is caused not meet design requirement.It is easy at this time
Great life casualty accident occurs, once accident occurs, huge economic loss will be brought to construction enterprises and individual, even
Using life as cost.
Traditional derrick crane squareness measurement mode is to set up measuring instrument, observes tower lifting by instrument eyepiece
Machine standard knot outer wall deviation, the deviation data observed in eyepiece is only estimated with naked eyes, can not accurately read real data.And
Often it can not set up instrument because construction place is complicated and be observed, or can not be observed because being not equipped with instrument eyepiece elbow
Higher derrick crane.
And it is existing using laser aid carry out crane squareness measurement when, radiating laser beams device is mounted on tower
Corresponding electronic receipt settlement or Image Acquisition is arranged in the top of formula crane on the pedestal of derrick crane or ground
Device, then by the calculating analysis of electronic receipt settlement or the image recognition and analysis of image collecting device, obtain tower
The drift rate of heavy-duty machine, this apparatus structure is complicated, operation time is long.
Utility model content
The utility model aim is to provide a kind of device for measuring derrick crane verticality, solves existing tower
The verticality measurement device of heavy-duty machine is inconvenient for use, measurement data can not accurately be read and structure is complicated, operation time long asks
Topic.Therefore the device of the utility model designed a kind of measurement derrick crane verticality regarding to the issue above, using swashing
On the basis of beam launcher, a kind of drift rate, offset distance that can directly, quickly calculate derrick crane is designed
And the laser beam reception device of offset direction, with improve derrick crane offset distance reading accuracy, rapidity with
And low cost.
The utility model is achieved through the following technical solutions:
A kind of device measuring derrick crane verticality, including the radiating laser beams being mounted on the derrick crane
Device, Vertical Launch goes out laser beam to the radiating laser beams device to the ground, and being provided on the ground can be shone by laser beam
The positioning plate being mapped to, is provided with XOY coordinate system on positioning plate, and along in XOY coordinate system X-axis and Y-axis be provided with
Graduation mark, when the verticality of derrick crane meets design requirement, origin and laser beam in XOY coordinate system are irradiated to positioning
Position on plate is overlapped.
When initial, starting radiating laser beams device connects so that radiating laser beams device launches one laser beam to the ground
The position on ground is radiated at according to laser beam, positioning plate is moved to the lower section of laser beam, and adjust positioning plate, so as to be located at
The origin in XOY coordinate system on positioning plate upper surface is irradiated to the position on positioning plate with laser beam and is overlapped, then will positioning
Plate fixes on the ground.When after a period of use, needing to carry out maintenance to derrick crane, confirm its verticality, starting
Radiating laser beams device, so that it launches a light beam to the ground, when original is deviateed in position of light beam irradiation on positioning plate
When point, then the distance of corresponding offset in its X-axis and Y-axis is measured, then X-axis and Y-axis position by setting, correspondingly to tower
Crane is adjusted, so that its verticality meets design requirement.
In the utility model, by the positioning plate with corresponding coordinate system of setting, in the maintenance of derrick crane,
Can Rapid reading go out its offset distance be in radiating laser beams device at sustained height, then convenient for subsequent maintenance.Phase
For observing column crane mast section outer wall deviation by instrument eyepiece in existing derrick crane verticality measurement device
Device for, reading is more accurate, intuitive；It is tower when relative to the squareness measurement for carrying out crane using laser aid
The rate of reading of the offset of crane is fast, at low cost, calculate without complicated, high-cost electronic receipt settlement and divide
The image recognition and analysis of analysis or image collecting device.
Further, further include measurement component, on the upper surface of the positioning plate along the X-axis in XOY coordinate system with
And Y-axis is respectively arranged with sliding slot, the measurement component includes locating piece and two sliding blocks, and the sliding block respectively passes through one respectively
Elastic string is connect with locating piece, and the bottom of sliding block is inserted into respectively in a sliding slot, and locating piece is located on positioning plate.
When after a period of use, needing to carry out maintenance to derrick crane, confirm its verticality, starting laser beam hair
Injection device, so that it launches a light beam to the ground, when position of light beam irradiation on positioning plate is new position, this new position
When setting deviation from origin, locating piece is located on positioning plate and is located on new position, then slide two sliding blocks, so as to be located at parallel
The elastic string between sliding block and locating piece in X-axis sliding slot is parallel to Y-axis, another is located parallel to the sliding block of Y-axis sliding slot
Elastic string between locating piece is parallel to X-axis, then read elastic string respectively between X-axis and Y-axis point of intersection scale
The reading of line then reads out and is at sustained height relative to origin with radiating laser beams device at two on derrick crane
Offset distance in vertical direction, then X-axis and Y-axis position by setting, are correspondingly adjusted derrick crane, so that
Its verticality meets design requirement.
The setting for measuring component, to be allowed to further accelerate the reading of the offset distance of derrick crane, and makes to read
Number is more accurate.
Further, criss-cross comparison lines, the comparison lines are provided on the upper surface of the positioning plate
Middle lateral lines are parallel to X-axis, and longitudinal lines are parallel to Y-axis.
It, can be by when being allowed to be respectively parallel to X-axis and Y-axis when directly elastic string is compared with X-axis and Y-axis respectively
Between elastic string and X-axis and Y-axis as its benchmark there are biggish distances, and elastic string is caused to be in non-parallel to X
The state of axis and Y-axis, therefore it has an impact for the accuracy of the reading of the graduation mark in X-axis and Y-axis, therefore setting is handed in length and breadth
Wrong comparison lines, with when adjusting sliding block makes two elastic strings need to be respectively parallel to X-axis and Y-axis, by it respectively with therewith
Nearest cross-wise lines and longitudinal lines are compared, and to be adjusted in parallel, then reduce error in reading, improve accuracy of reading
Property and rapidity.
Further, be provided with iron plate in the slot bottom of sliding slot, on the upper surface of positioning plate and be located at XOY coordinate system as
Position in limit is provided with iron plate, is provided with magnet in the bottom of locating piece and two sliding blocks.
When the adjustment for completing sliding block makes elastic string respectively with X-axis and parallel Y-axis, sliding block passes through the magnet and sliding slot of bottom
The iron plate of slot bottom, which adsorbs, to be fixed, and locating piece is adsorbed on iron plate by the magnet of its bottom, is read with facilitating with staff, nothing
It need to continue to fix locating piece and sliding block with hand.
The utility model compared with prior art, has the following advantages and benefits:
1, a kind of device for measuring derrick crane verticality of the utility model, by setting with corresponding coordinate system
Positioning plate, in the maintenance of derrick crane, energy Rapid reading goes out it and is at sustained height with radiating laser beams device
Offset distance is then convenient for subsequent maintenance.Relative in existing derrick crane verticality measurement device pass through instrument mesh
Mirror is observed for the device of column crane mast section outer wall deviation, and reading is more accurate, intuitive；Relative to using laser aid
When carrying out the squareness measurement of crane, the rate of reading of the offset of derrick crane is fast, at low cost, without complicated, high
The electronic receipt settlement of cost calculate the image recognition and analysis of analysis or image collecting device；
2, a kind of device for measuring derrick crane verticality of the utility model, measures the setting of component, to be allowed into one
The reading of the offset distance of derrick crane is accelerated to step, and makes to read more accurate；
3, a kind of device for measuring derrick crane verticality of the utility model, locating piece are adsorbed by the magnet of its bottom
It on iron plate, is read with facilitating with staff, fixes locating piece and sliding block with hand without continuing.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram for measuring component；
The structural schematic diagram of Fig. 3 embodiment 3；
Fig. 4 is the structural schematic diagram of positioning plate in embodiment 5；
Fig. 5 is the top view of Fig. 4；
Fig. 6 is the structural schematic diagram of embodiment 6；
Fig. 7 is the top view of Fig. 6；
Fig. 8 is the structural schematic diagram of embodiment 8.
Label and corresponding parts title in attached drawing:
1- derrick crane, 2- radiating laser beams device, 3- laser beam, 4- positioning plate, 5- graduation mark, 6- sliding slot, 7- are fixed
Position block, 8- sliding block, 9- elastic string, 10- iron plate, 11- magnet, 12- screw, 13- pedestal, 14- compare lines, the quasi- grounding leg of 15-
Bolt, 16- origin, 17- deviation post, 18- power supply line, 19- tower crane driver room, the power switch of 20- radiating laser beams device.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model is not intended to limit the scope of the present invention.
Embodiment 1
As Figure 1-Figure 8, a kind of device for measuring derrick crane verticality of the utility model, including be mounted on described
Radiating laser beams device 2 on derrick crane 1, Vertical Launch goes out laser beam 3 to the radiating laser beams device 2 to the ground,
It is provided with the positioning plate 4 that can be irradiated to by laser beam 3 on the ground, is provided with XOY coordinate system on positioning plate 4, and along
X-axis and Y-axis in XOY coordinate system are provided with graduation mark 5, when the verticality of derrick crane 1 meets design requirement,
Origin in XOY coordinate system is overlapped with the position that laser beam 3 is irradiated on positioning plate 4.
When derrick crane 1 is installed according to Design Requirement Drawing, verticality meets design requirement, at this time laser beam
Emitter 2 is fixed on the top of derrick crane 1, and the tower crane driver room of derrick crane 1 is accessed by a power supply line
Circuit in, the power switch of radiating laser beams device 2 is arranged in tower crane driver room, in order to which staff is located at tower crane department
The opening and closing of i.e. controllable radiating laser beams device 2 in machine room.When initial, start radiating laser beams device 3, so that radiating laser beams
Device 3 launches one laser beam 3 to the ground, and the position on ground is radiated at then according to laser beam 3, and positioning plate 4 is moved to
The lower section of laser beam 3, and positioning plate 4 is adjusted, so that origin and laser in the XOY coordinate system being located on 4 upper surface of positioning plate
Beam 3 is irradiated to the coincidence of the position on positioning plate 4, then fixes positioning plate 4 on the ground.When after a period of use, needing
When carrying out maintenance to derrick crane 1, confirm its verticality, start radiating laser beams device 2, so that it launches one to the ground
A light beam then measures corresponding offset in its X-axis and Y-axis when the sub position deviation from origin on positioning plate 4 of light beam irradiation
Distance, then X-axis and Y-axis position by setting, are correspondingly adjusted derrick crane 1, set so that its verticality meets
Meter requires.
In the utility model, by the positioning plate 4 with corresponding coordinate system of setting, in the maintenance of derrick crane 1
In, can Rapid reading go out its offset distance be in radiating laser beams device 2 at sustained height, then convenient for subsequent dimension
It protects.Column crane mast section outer wall is observed by instrument eyepiece relative in existing derrick crane verticality measurement device
For the device of deviation, reading is more accurate, intuitive；When relative to the squareness measurement for carrying out crane using laser aid,
The rate of reading of the offset of derrick crane 1 is fast, at low cost, carries out without complicated, high-cost electronic receipt settlement
Calculate the image recognition and analysis of analysis or image collecting device.
Embodiment 2
The present embodiment is on the basis of embodiment 1, to increase measurement component.
As shown in Fig. 1-Fig. 7, a kind of device for measuring derrick crane verticality of the utility model, further includes measurement group
Part, on the upper surface of the positioning plate 4 along in XOY coordinate system X-axis and Y-axis be respectively arranged with sliding slot 6, the survey
Amount component includes locating piece 7 and two sliding blocks 8, and the sliding block 8 is respectively connect by an elastic string 9 with locating piece 7 respectively, and sliding
The bottom of block 8 is inserted into respectively in a sliding slot 6, and locating piece 7 is located on positioning plate 4.
When after a period of use, needing to carry out maintenance to derrick crane 1, confirm its verticality, start laser beam
Emitter 2, so that it launches a light beam to the ground, it is new position when light beam irradiates position of the son on positioning plate 4, this
When new position deviation from origin, locating piece 7 is located on positioning plate 4 and is located on new position, then slides two sliding blocks 8, so that
Elastic string 9 between the sliding block 8 being located parallel in X-axis sliding slot 6 and locating piece 7 is parallel to Y-axis, another is located parallel to Y
Elastic string between the sliding block 8 and locating piece 7 of axis sliding slot 6 is parallel to X-axis, then read elastic string 9 respectively with X-axis and Y-axis
Between point of intersection graduation mark reading, then read out and be in sustained height with radiating laser beams device 2 on derrick crane 1
Offset distance of the place relative to origin in two perpendicular direction, then X-axis and Y-axis position by setting, correspondingly to tower
Crane 1 is adjusted, so that its verticality meets design requirement.
The setting for measuring component, to be allowed to further accelerate the reading of the offset distance of derrick crane, and makes to read
Number is more accurate.
Embodiment 3
The present embodiment is to further illustrate on the basis of embodiment 2 to the measurement of the utility model.
As shown in figure 3, a kind of device for measuring derrick crane verticality of the utility model, in the upper of the positioning plate 4
It is provided with criss-cross comparison lines 14 on surface, it is described to compare lines lateral in lines 14 and be parallel to X-axis, longitudinal line
Item is parallel to Y-axis.
It, can be by when being allowed to be respectively parallel to X-axis and Y-axis when directly elastic string 9 is compared with X-axis and Y-axis respectively
Between elastic string 9 and X-axis and Y-axis as its benchmark there are biggish distances, and cause elastic string 9 be in non-parallel to
The state of X-axis and Y-axis, therefore it has an impact for the accuracy of the reading of the graduation mark in X-axis and Y-axis, therefore is arranged in length and breadth
Staggered comparison lines 14, to be distinguished when adjusting sliding block 8 makes two elastic strings 9 need to be respectively parallel to X-axis and Y-axis
It is compared with cross-wise lines nearest therewith and longitudinal lines, to be adjusted in parallel, then reduces error in reading, improve and read
Number accuracy and rapidity.
Embodiment 4
The present embodiment is to further illustrate on the basis of embodiment 2 to the fixation of sliding block and locating piece.
As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 6, a kind of device for measuring derrick crane verticality of the utility model, in cunning
The slot bottom of slot 6 is provided with iron plate 10, and the position on the upper surface of positioning plate 4 and in XOY coordinate system quadrant is provided with
Iron plate is provided with magnet 11 in the bottom of locating piece 7 and two sliding blocks 8.
When the adjustment for completing sliding block makes elastic string respectively with X-axis and parallel Y-axis, sliding block 8 by the magnet 11 of bottom with
The iron plate 10 of 6 slot bottom of sliding slot, which adsorbs, to be fixed, and locating piece 7 is adsorbed on iron plate by the magnet 11 of its bottom, to facilitate and work
Personnel's reading fixes locating piece 7 and sliding block 8 with hand without continuing.
Embodiment 5
The present embodiment is on the basis of examples 1 to 4, to further illustrate to XOY coordinate system.
As shown in Figure 3-Figure 5, a kind of device for measuring derrick crane verticality of the utility model, the XOY coordinate system
Only first quartile.
When carrying out the measurement of verticality using the left side XOY only with first quartile, can according to practical production experience, with
The deviation post for keeping derrick crane final is fallen in first quartile, is then convenient for about laser offset point at a distance of initial point distance
Measurement.
Embodiment 6
The present embodiment is on the basis of examples 1 to 4, to further illustrate to XOY coordinate system.
As Figure 6-Figure 7, a kind of device for measuring derrick crane verticality of the utility model, the XOY coordinate system
There is the 4th quadrant.
When using tool, there are four when the XOY coordinate of quadrant, no matter derrick crane is deviated to which direction, can fall in four
In a quadrant in a quadrant, and there is corresponding graduation mark numerical value with origin relatively, convenient for laser offset point at a distance of origin
The measurement of distance.
Embodiment 7
The positioning plate 4 is fixed on the pedestal 13 of derrick crane 1 by screw 12.
Welding or cement, which pour, on pedestal 13 fixes a bottom plate with threaded hole, the original in XOY coordinate system
Point is with the position that laser beam 3 is irradiated on positioning plate 4 when being overlapped, screw 12 after positioning plate 4 with the threaded hole spiral shell on bottom plate
Line connection, and screw 12 has edges that are multiple, and being located at positioning plate 4.
Embodiment 8
The present embodiment is made an explanation to the actual measurement use of the utility model.
As shown in figure 8, a kind of device for measuring derrick crane verticality of the utility model, figure label 16 are origin,
Also the position on positioning plate 4 is irradiated to for laser beam 3 under original state；Figure label 15 is that the basic standard of derrick crane connects
Foundation bolt (four origins of rectangular arrangement indicate quasi- ground connection foot bolt in Fig. 8), label 17 is derrick crane in Fig. 8
After offset, laser beam 3 is irradiated to the deviation post on positioning plate 4, then according to the measurement method in embodiment 1 or embodiment 2,
Measure the distance that deviation post deviates in X-axis and Y-axis relative to initial position (origin): X0、Y0., then according to X0、
Y0The adjustment of derrick crane complies with design.X-axis and Y-axis are respectively parallel to the rectangle that quasi- ground connection foot bolt is surrounded
Two sides.
Embodiment 9
The present embodiment is illustrated to the concrete operation step of the utility model.
As Figure 1-Figure 8, the step of measurement derrick crane offset is as follows:
(1) radiating laser beams device 2 is fixed on and states side of 1 body of derrick crane far from ground, and make laser beam
The laser beam 3 that emitter 2 is launched is perpendicular to ground (this is original state)；
(2) positioning plate 4 is fixed on the ground, and made in the origin and original state of the XOY coordinate system on positioning plate 4,
Laser beam 3 is irradiated to the coincidence of the position on positioning plate 4；
(3) when carrying out maintenance to derrick crane 1, start radiating laser beams device 2, due to 1 verticality of derrick crane
It changes, the position for then causing laser beam 3 to be irradiated on positioning plate 4 is not overlapped with origin, and laser beam 3 is irradiated to fixed at this time
Position on the plate 4 of position is deviation post；
(4) it on 7 placement positioning plate 4 of locating piece and will be disposed offset from position, two sliding blocks 8 then slided, so as to be located at
Elastic string 9 between the sliding block 8 being parallel in X-axis sliding slot 6 and locating piece 7 is parallel to Y-axis, and it is sliding that another is located parallel to Y-axis
Elastic string between the sliding block 8 and locating piece 7 of slot 6 is parallel to X-axis, then reads elastic string 9 respectively between X-axis and Y-axis
The reading of the graduation mark of point of intersection: X0、Y0., then read out and be in same height with radiating laser beams device 2 on derrick crane 1
Offset distance at degree relative to origin in two perpendicular direction, then X-axis and Y-axis position by setting, correspondingly to tower
Formula crane 1 is adjusted, so that its verticality meets design requirement.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
Determine the protection scope of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of device for measuring derrick crane verticality, including the laser beam hair being mounted on the derrick crane (1)
Injection device (2), Vertical Launch goes out laser beam (3) to the radiating laser beams device (2) to the ground, it is characterised in that: describedly
XOY coordinate system can be provided with by the positioning plate (4) that laser beam (3) are irradiated on positioning plate (4) by being provided on face, and along
X-axis and Y-axis in XOY coordinate system are provided with graduation mark (5), when the verticality of derrick crane (1) meets design requirement
When, the origin in XOY coordinate system is overlapped with the position that laser beam (3) is irradiated on positioning plate (4).
2. a kind of device for measuring derrick crane verticality according to claim 1, it is characterised in that: further include measurement
Component, on the upper surface of the positioning plate (4) along in XOY coordinate system X-axis and Y-axis be respectively arranged with sliding slot (6),
The measurement component includes locating piece (7) and two sliding blocks (8), and the sliding block (8) respectively passes through an elastic string (9) respectively and determines
Position block (7) connects, and the bottom of sliding block (8) is inserted into respectively in a sliding slot (6), and locating piece (7) is located on positioning plate (4).
3. a kind of device for measuring derrick crane verticality according to claim 2, it is characterised in that: in the positioning
It is provided with criss-cross comparison lines (14) on the upper surface of plate (4), described to compare lines lateral in lines (14) parallel
In X-axis, longitudinal lines are parallel to Y-axis.
4. a kind of device for measuring derrick crane verticality according to claim 2, it is characterised in that: in sliding slot (6)
Slot bottom be provided with iron plate (10), on the upper surface of positioning plate (4) and be located at XOY coordinate system quadrant in position be provided with
Iron plate is provided with magnet (11) in the bottom of locating piece (7) and two sliding blocks (8).
5. a kind of device of measurement derrick crane verticality described in any one of -4 according to claim 1, it is characterised in that:
The XOY coordinate system only has first quartile.
6. a kind of device of measurement derrick crane verticality described in any one of -4 according to claim 1, it is characterised in that:
The XOY coordinate system has the 4th quadrant.
7. a kind of device for measuring derrick crane verticality according to claim 1, it is characterised in that: the positioning plate
(4) it is fixed on the pedestal (13) of derrick crane (1) by screw (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821213284.2U CN208454312U (en) | 2018-07-27 | 2018-07-27 | A kind of device measuring derrick crane verticality |
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| CN201821213284.2U CN208454312U (en) | 2018-07-27 | 2018-07-27 | A kind of device measuring derrick crane verticality |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033363A (en) * | 2020-08-12 | 2020-12-04 | 中国建筑第二工程局有限公司 | Tower body inclination measuring method of tower crane |
-
2018
- 2018-07-27 CN CN201821213284.2U patent/CN208454312U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033363A (en) * | 2020-08-12 | 2020-12-04 | 中国建筑第二工程局有限公司 | Tower body inclination measuring method of tower crane |
| CN112033363B (en) * | 2020-08-12 | 2021-06-04 | 中国建筑第二工程局有限公司 | Tower body inclination measuring method of tower crane |
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