CN110565530A - Main cable laying method of cable crane - Google Patents
Main cable laying method of cable crane Download PDFInfo
- Publication number
- CN110565530A CN110565530A CN201910803357.6A CN201910803357A CN110565530A CN 110565530 A CN110565530 A CN 110565530A CN 201910803357 A CN201910803357 A CN 201910803357A CN 110565530 A CN110565530 A CN 110565530A
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- Prior art keywords
- cable
- main
- saddle
- cable saddle
- anchoring
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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
Abstract
The invention discloses a main cable laying method of a cable crane, which comprises the following steps: s1: defining the connection points of the side span section and the middle span section of the main cable at the pulley on the cable saddle as intersection points, drawing a circle in a vertical plane by taking the intersection points as circle centers and the length of the side span section as a radius when the cable saddle is at an initial position, translating the circle along a transverse bridge direction to form a cylindrical barrel, and defining the area tangent to the cylindrical barrel on the wall surface of the anchor ingot as an anchoring area; s2: selecting a plurality of anchoring points on the anchoring area, wherein the anchoring points meet the conditions: the first condition is as follows: the distance between two adjacent anchoring points on the anchor ingot in the transverse bridge direction is equal to the distance between two adjacent pulleys on the cable saddle; and a second condition: when a plurality of main cables with the same length are laid and the cable saddle is at an initial position, the lengths of the side span sections of the main cables between the same cable saddle and the anchor ingot close to the cable saddle are equal; s3: and finishing the laying of the main ropes. After the initial sag adjustment of the main cable of the cable crane is finished, the cable saddle does not need to adjust the length of the main cable even though the cable saddle transversely moves.
Description
Technical Field
The invention relates to the technical field of construction of superstructure of large-span bridge engineering, in particular to a cable crane main cable laying method.
Background
the cable crane is very common in bridge construction engineering, fig. 1 is a schematic diagram of the cable crane after a main cable 1 is laid, in fig. 1, cable saddles 4 are mounted on two cable towers 5, as shown in fig. 2, a plurality of pulleys 2 are arranged on the cable saddles 4, one main cable 1 can be wound around one pulley 2, the distance between two adjacent pulleys 2 is h, and as shown in fig. 1 again, an anchor 3 is arranged outside each of the two cable towers 5, one end of each of the plurality of main cables 1 is anchored on one of the anchors 3, the other end of each of the plurality of main cables 1 is anchored on the other anchor 3 after being sequentially wound around the pulleys 2 of the cable saddles 4 on the two cable towers 5, the part of each of the main cables 1, which is located between the cable saddles 4 on the cable towers 5 and the anchor 3 close to the cable towers 5, is a side span 10, the part of each of the main cables 1, which is located between the cable saddles 4 on the two cable towers 5, is a middle span 11, and the length of each of the main cables 1 is the.
The change in length of mid-span 11 has a significant effect on the sag of mid-span 11 throughout the cable crane hoist. In the hoisting process, the cable saddle 4 often moves transversely along the transverse bridge direction due to hoisting requirements, and for the cable crane installed at present, after each main cable 1 is adjusted for the first time, the sag of each mid-span section 11 is the same, but when the cable saddle 4 moves transversely due to hoisting requirements, if the length of the main cable 1 is not adjusted for the second time, the length change of the side span sections 10 of each main cable 1 is inconsistent, and the direct influence is that the length change of each mid-span section 11 is inconsistent, and because the length change of each mid-span section 11 is inconsistent, the length of each mid-span section 11 is unequal, so that the sag of each mid-span section 11 is different, and finally the stress of the main cable 1 is seriously uneven.
In order to solve the problems, the length of the main cable is usually adjusted when the cable saddle 4 is transversely moved to different positions, although the method can adjust the sag after the transverse movement to be the same, the cable adjusting process in the whole hoisting stage is tedious and tedious, the cable force and the sag of the main cable need to be measured after the length of the main cable is adjusted, the cable adjusting precision affects the hoisting speed and quality, the construction period is greatly affected, and the cable adjusting needs to be provided with a special cable adjusting device and special manpower, so that the construction cost is increased.
Disclosure of Invention
aiming at the defects in the prior art, the invention aims to provide a method for laying main cables of a cable crane, which can ensure that the main cables have the same sag without adjusting the length of the main cables after a cable saddle is transversely moved.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a main cable laying method of a cable crane comprises the following steps:
S1: defining the connection points of the side span section and the middle span section of the main cable at the pulley on the cable saddle as intersection points, drawing a circle in a vertical plane by taking the intersection points as circle centers and the length of the side span section as a radius when the cable saddle is at an initial position, translating the circle along a transverse bridge direction to form a cylindrical tube, and defining the area tangent to the cylindrical tube on the wall surface of the anchor ingot as an anchoring area;
S2: selecting a plurality of anchoring points on the anchoring area, wherein the anchoring points meet the following conditions:
the first condition is as follows: the distance between two adjacent anchoring points on the anchor ingot in the transverse bridge direction is equal to the distance between two adjacent pulleys on the cable saddle;
And a second condition: when a plurality of main cables with the same length are laid and the cable saddle is in an initial position, the length of a side span between the same cable saddle and an anchor ingot close to the cable saddle is equal;
S3: and completing the laying of each main cable.
Furthermore, all the anchoring points on the anchor ingot are arranged into an upper row and a lower row along the transverse bridge direction, and the anchoring points in the upper row and the lower row are sequentially arranged in a staggered manner.
Further, all the anchoring points on the anchor are arranged in a line along the transverse bridge direction.
Further, when the cable saddle is in the initial position, the side span section is approximately perpendicular to the transverse bridge direction.
further, two side spans of the main cable on two sides of the span are equal in length.
Further, when the cable saddle is in the initial position, the sag of the midspan section of each main cable is equal.
compared with the prior art, the invention has the advantages that:
By using the method provided by the invention, even if the cable saddle is transversely moved in the hoisting process after the initial sag adjustment of the main cable of the cable crane is finished, the length of the main cable is not required to be adjusted, the working procedures are reduced, the construction period is shortened, a cable adjusting device is not required, the material is saved, the manpower is reduced, the safety risk is reduced, and the construction is convenient and easy to operate.
Drawings
FIG. 1 is a schematic view of a cable crane after the main cable is laid;
FIG. 2 is a schematic structural view of a cable saddle;
fig. 3 is a first schematic diagram of a main cable laying method of the cable crane according to the embodiment of the invention;
Fig. 4 is a schematic diagram of a main cable laying method of the cable crane according to the embodiment of the invention;
FIG. 5 is a schematic diagram of the main cable layout of the cable crane according to the embodiment of the present invention;
in the figure: 1. a main rope; 10. an edge span; 11. a mid-span section; 2. a pulley; 3. anchoring; 4. a cable saddle; 5. a cable tower; 6. an anchoring point; 7. a point of intersection; 8. a cylindrical barrel; 9. an anchor region.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
referring to fig. 3 in combination with fig. 1 and 2, an embodiment of the invention provides a main cable laying method of a cable crane, which includes the following steps:
S1: defining the connection point of the side span section 10 and the middle span section 11 of the main cable 1 at the pulley 2 on the cable saddle 4 as an intersection point 7, drawing a circle in a vertical plane by taking the intersection point 7 as the center of a circle and the length of the side span section 10 when the cable saddle 4 is at the initial position as the radius, translating the circle along the transverse bridge direction to form a cylindrical barrel 8, and defining the area tangent to the cylindrical barrel 8 on the wall surface of the anchor spindle 3 as an anchoring area 9;
s2: selecting a plurality of anchoring points 6 on the anchoring area 9, wherein the anchoring points 6 meet the following conditions:
the first condition is as follows: the distance between two adjacent anchoring points 6 on the anchor spindle 3 in the transverse bridge direction is equal to the distance between two adjacent pulleys 2 on the cable saddle 4;
And a second condition: when a plurality of main cables 1 with the same length are laid and the cable saddle 4 is at an initial position, the side span sections 10 of the main cables 1 between the same cable saddle 4 and the anchor block 3 close to the cable saddle 4 are equal in length;
S3: completing the laying of each main rope 1.
The principle of the invention is as follows: referring to fig. 4, two long sides X and Y of the lower surface of the cuboid M are tangent to the cylindrical barrel 8, a connecting line of midpoints of two wide sides of the upper surface of the cuboid M coincides with a central axis of the cylindrical barrel 8, an intersection point 7 of each main rope is on the central axis of the cylindrical barrel 8, a distance between two adjacent intersection points 7 is h (i.e., a distance between two adjacent pulleys 2), all anchoring points 6 on the anchor bar 3 are arranged in two rows along the central axis of the cylindrical barrel 8 (the axial direction and the transverse bridge direction of the cylindrical barrel 8 are the same), the two rows are respectively located on the long sides X and Y, and the anchoring points 6 in the two rows are sequentially arranged in a staggered manner; two main ropes are used asFor example, the initial position of the first main rope is line segment AB, the initial intersection point is A, the anchoring point is B, the initial position of the second main rope is line segment FG, the initial intersection point is F, the anchoring point is G, the plane BCDE where the line segment AB is located is parallel to the plane GHIJ where the line segment FG is located, the line segment AE, the line segment AB and the line segment FG are the same in length, when the plane GHIJ is translated to the plane BCDE along the central axis of the cylindrical barrel, the line segment FG is overlapped with the line segment AE, and when the rope saddle is translated transversely, the intersection point A is transversely translated to A1The line segment AB becomes the line segment A1b, the intersection point F is transversely moved to F1The line segment FG becomes a line segment F1G, the plane BCDE is changed into the plane BC after rotating by taking BE as a rotating shaft1D1e, the plane GHIJ is changed into the plane GH after rotating by taking the GJ as a rotating shaft1I1J, and plane BC1D1E and plane GH1I1j is still parallel, since the plane GHIJ translates along the central axis of the cylinder to the plane BCDE, the line segment FG coincides with the line segment AE, and likewise, the plane GH1I1J translates to plane BC along the central axis of the cylinder1D1e, line segment F1G and line segment A1e coincide and line segment A1B. Line segment A1E and line segment F1g lengths are the same, so that, on the premise that the above-described first and second conditions are satisfied, the lengths of the side spans 10 of the respective main ropes 1 are the same before the saddle 4 is traversed, and after the traversing, the lengths of the side spans 10 are changed, but the end result is that the lengths of the side spans 10 are the same, and further, the lengths of the mid-spans 11 of the respective main ropes 1 are always the same regardless of whether the traversing is performed, thereby ensuring the same sag of the main ropes.
therefore, by using the method provided by the invention, even if the cable saddle is transversely moved in the hoisting process after the initial sag adjustment of the main cable of the cable crane is finished, the length of the main cable does not need to be adjusted, the working procedures are reduced, the construction period is saved, a cable adjusting device is not needed, the materials are saved, the manpower is reduced, the safety risk is reduced, and the construction is convenient and easy to operate.
referring to fig. 3 or 4, in one embodiment, all the anchoring points 6 on the anchor 3 are arranged in two upper and lower rows along the transverse bridge direction, and the anchoring points 6 in the upper and lower rows are arranged in a staggered manner in sequence.
Referring to fig. 5, in another embodiment, all the anchoring points 6 on the anchor 3 are aligned along the transverse bridge direction, the side spans 10 are all in the same plane, and the straight lines of the two adjacent side spans 10, the anchoring points 6 and all the intersection points 7 form a parallelogram, and the lengths of the side spans 10 change synchronously when the cable saddle traverses.
The side span section 10 is substantially perpendicular to the transverse bridge direction when the cable saddle 4 is in the initial position.
The two side spans 10 of the main cable 1 on either side of the span 11 are of equal length.
when the cable saddle 4 is at the initial position, the sag of the midspan 11 of each main cable 1 is equal.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. a main cable laying method of a cable crane is characterized by comprising the following steps:
S1: defining a connecting point of a side span section (10) and a middle span section (11) of a main cable (1) at a pulley (2) on a cable saddle (4) as an intersection point (7), drawing a circle in a vertical plane by taking the intersection point (7) as a circle center and taking the length of the side span section (10) as a radius when the cable saddle (4) is at an initial position, translating the circle along a transverse bridge direction to form a cylindrical barrel (8), and defining an area tangent to the cylindrical barrel (8) on the wall surface of an anchor (3) as an anchoring area (9);
S2: selecting a plurality of anchoring points (6) on the anchoring zone (9), the anchoring points (6) satisfying the following condition:
The first condition is as follows: the distance between two adjacent anchoring points (6) on the anchor (3) in the transverse bridge direction is equal to the distance between two adjacent pulleys (2) on the cable saddle (4);
And a second condition: when a plurality of main cables (1) with the same length are laid and the cable saddle (4) is in an initial position, the length of a side span section (10) of each main cable (1) between the same cable saddle (4) and an anchor (3) close to the cable saddle (4) is equal;
S3: and finishing the layout of each main rope (1).
2. The cable crane main cable laying method as claimed in claim 1, wherein: all the anchoring points (6) on the anchor (3) are arranged into an upper row and a lower row along the transverse bridge direction, and the anchoring points (6) in the upper row and the lower row are sequentially arranged in a staggered manner.
3. The cable crane main cable laying method as claimed in claim 1, wherein: all the anchoring points (6) on the anchor (3) are arranged in a line along the transverse bridge direction.
4. The cable crane main cable laying method as claimed in claim 1, wherein: when the cable saddle (4) is in the initial position, the side span sections (10) are approximately perpendicular to the transverse bridge direction.
5. The cable crane main cable laying method as claimed in claim 1, wherein: two side span sections (10) of the main cable (1) positioned at two sides of the span section (11) are equal in length.
6. The cable crane main cable laying method as claimed in claim 1, wherein: when the cable saddle (4) is at the initial position, the sag of the midspan section (11) of each main cable (1) is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910803357.6A CN110565530B (en) | 2019-08-28 | 2019-08-28 | Main cable laying method of cable crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910803357.6A CN110565530B (en) | 2019-08-28 | 2019-08-28 | Main cable laying method of cable crane |
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| Publication Number | Publication Date |
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| CN110565530A true CN110565530A (en) | 2019-12-13 |
| CN110565530B CN110565530B (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2534948A1 (en) * | 1982-10-22 | 1984-04-27 | Arnodin Sa Ets | Method for replacing a layer of suspension cables of a suspension bridge allowing the bridge to remain in service throughout the operation |
| JPH08144218A (en) * | 1994-11-17 | 1996-06-04 | Honsyu Shikoku Renrakukiyou Kodan | Aerial stringing method while controlling tension of pilot rope by using helicopter |
| CN103362070A (en) * | 2013-08-05 | 2013-10-23 | 湖南省建筑工程集团总公司 | Cable saddle transverse moving system of large-tonnage cable crane and cable saddle transverse moving method |
| CN108643058A (en) * | 2018-06-27 | 2018-10-12 | 中铁十八局集团第二工程有限公司 | Anchor after cable crane main rope cross sliding type |
| CN108639968A (en) * | 2018-06-27 | 2018-10-12 | 中铁十八局集团第二工程有限公司 | Whole lateral moving formula cable crane |
-
2019
- 2019-08-28 CN CN201910803357.6A patent/CN110565530B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2534948A1 (en) * | 1982-10-22 | 1984-04-27 | Arnodin Sa Ets | Method for replacing a layer of suspension cables of a suspension bridge allowing the bridge to remain in service throughout the operation |
| JPH08144218A (en) * | 1994-11-17 | 1996-06-04 | Honsyu Shikoku Renrakukiyou Kodan | Aerial stringing method while controlling tension of pilot rope by using helicopter |
| CN103362070A (en) * | 2013-08-05 | 2013-10-23 | 湖南省建筑工程集团总公司 | Cable saddle transverse moving system of large-tonnage cable crane and cable saddle transverse moving method |
| CN108643058A (en) * | 2018-06-27 | 2018-10-12 | 中铁十八局集团第二工程有限公司 | Anchor after cable crane main rope cross sliding type |
| CN108639968A (en) * | 2018-06-27 | 2018-10-12 | 中铁十八局集团第二工程有限公司 | Whole lateral moving formula cable crane |
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| CN110565530B (en) | 2021-01-26 |
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