JP2562794B2 - Suspension bridge saddle installation method and suspension bridge saddle device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for installing a suspension bridge saddle for supporting a midway portion of a cable to be erected at the upper end of a tower constituting a suspension bridge, and a suspension bridge saddle device.

[0002]

2. Description of the Related Art Conventionally, as a saddle device for a suspension bridge, FIG.
Also, a movable type having a configuration shown in FIG. 9 is known. In the figure, reference numeral 101 denotes a steel tower having a top 101A formed in a flat surface, and a plurality of reinforcing lattices 101B, 101B, ... Are fixed to the side surface of the tower 101 on the side of the top 101A. Reference numeral 102 denotes a saddle for supporting the cable A. The saddle 102 has a lower surface 102A formed flat, and an upper portion thereof has a substantially U-shaped recess 102B for supporting the cable A. 103, 103, ...
Is the lower surface 102A of the saddle 102 and the top 1 of the tower 101.
01A shows a plurality of columnar rollers rotatably arranged between them, and the saddle 102 can be moved back and forth in the installation direction of the cable A by the rollers 103, 103, ....

The conventional suspension bridge saddle device is constructed as described above, and when the cable A is installed, the saddle 102 is installed on the tower 101 against the influence of expansion and contraction of the cable A due to temperature changes, the influence of wind load, and the influence of seismic load. The cable slip force of the cable A is reduced by moving in the direction of the arrow.

[0004]

By the way, in the above-mentioned prior art, in order to fix the saddle 102 after the cable A is installed to the top 101A of the tower 101, the roller 10 is used.
Since the hardened material 104 such as mortar is injected into the portions 3, 103, ... To bury the entire roller 103,
There are the following problems.

The first point is that since a movable structure having a small frictional resistance remains between the tower 101 and the saddle 102, it lacks strength. The second point is that the cured product 104 deteriorates over time, so that it lacks durability and requires long-term maintenance. The third point is that the roller 103 remains as a constituent of the suspension bridge, so that the cost is increased because it is necessary to have resistance to the reaction force of the tower 101 and the cable A. Fourth, the load applied to the cable A is sequentially transmitted from the saddle 102 to the roller 103 and the top 101A, but in the case of the steel tower 101, the top 101A receives the reaction force from the saddle 102 by the reinforcing grid 101B. The structure is such that it can be transmitted to the outer plate. Therefore, when the saddle 102 is fixed after the installation of the cable A is completed, each roller 103 is fixed.
It is necessary to match the position of the position with the position of each reinforcing grid 101B, but this alignment is difficult, and if there is a deviation in position, the efficiency of force transmission to the reinforcing grid 101B becomes poor. Is.

The present invention has been made in view of the above-mentioned problems of the prior art. The saddle is movable when the cable is erected and can be firmly fixed to the tower after the erection, and the movable support used for installing the saddle is removed. An object of the present invention is to provide a suspension bridge saddle installation method and a suspension bridge saddle device that can be used.

[0007]

According to the method for installing a suspension bridge saddle device according to the present invention, which is configured to solve the above-mentioned problems, a movable support is installed on a fixed guide provided at an upper end of a tower in a cable erection direction. And a step of supporting the saddle by the movable support in a state of being separated from the fixed guide body, and placing the saddle on the fixed guide body after the cable is installed on the saddle, It includes a step of removing the movable support body from the fixed guide body and a step of fixing the saddle to the fixed guide body.

The suspension bridge saddle device according to the present invention is
A fixed guide body fixed to the upper end of the tower and provided with a pair of support body guide portions on the upper surface side along the cable erection direction; a saddle mounted on the fixed guide body and fixable by fixing means; A saddle support portion that is releasably engaged with the saddle to support the saddle in a state of being separated from the fixed guide body; and a lifting lock portion that separates the saddle from the fixed guide body. It is composed of a pair of movable supports which are guided by the support guide part so as to be movable on the fixed guide and removable from the fixed guide.

Further, it is preferable that a slide contact member is provided in a support body guide portion of the fixed guide body, and a slide member that is in contact with the slide contact member is provided in the movable support body.

[0010]

The movable support is mounted on the fixed guide provided at the upper end of the tower so as to be movable back and forth in the cable erection direction, and the saddle support portion of the movable support supports the saddle in a state of being separated from the fixed guide. In this state, after the cable is installed on the saddle, the saddle is placed on the fixed guide body, and the movable support body is removed from the fixed guide body. Finally, the saddle is fixed to the fixed guide body.

By providing a sliding contact member in the support body guide portion of the fixed guide body and a sliding member in contact with the sliding contact member in the movable support body, the movable support body slides smoothly. can do.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 5 show a saddle device for a suspension bridge according to this embodiment. In the drawing, reference numeral 1 denotes a fixed guide body, which is a flat plate-shaped member having a pair of left and right guide grooves 2A, 2A which are located on both sides in the width direction and parallel to the erection direction of the cable A. It is composed of a substrate 2 and a rectangular Teflon plate 3 laid on the bottom surface 2B of each of the guide grooves 2A. The fixed guide body 1 is a bolt on the top surface 101A of the tower 101.
It is fixed by fixing means such as welding.

Reference numerals 4 and 4 designate a pair of movable supports slidably fitted in the guide grooves 2A, 2A. Reference numeral 5 denotes a movable base that constitutes each movable support body 4. The movable base 5 is composed of a rectangular block body, and a lower surface 5A is made of a stainless steel sliding plate that slides on the Teflon plate 3. 6 is stuck. Reference numerals 7, 7, ... Denote saddle support bases that are fixed on the movable base 5 by a bolt 8 at predetermined intervals.
Each saddle support 7 is formed in an inverted T shape from a lower plate portion 7A and a vertical plate portion 7B, and a rib fitting groove 7C is formed in the vertical plate portion 7B in a direction orthogonal to the guide groove 2A. There is.

Next, reference numeral 9 denotes a saddle which is supported by the pair of movable supports 4 and 4 and is movable in the tensioning direction of the cable A. Reference numeral 10 is a base having a substantially rectangular plane which constitutes the saddle 9, and the base 10 has a plurality of bolt insertion holes 10 in the vertical direction.
A, 10A, ... Are drilled. 11 is the base 1
0 shows a saddle body fixedly mounted on the upper surface of the saddle body 11. The saddle body 11 has flat end surfaces 11A and 11A, left and right side surfaces 11B and 11B which are curved on the lower side, and a cable fitting formed in a concave shape by a stepped surface. It consists of a joint 11C. And
Four body ribs 12, 12, ... from both side surfaces 11B, 11B of the saddle body 11 to the left (right) side end of the base 10.
Are separated by a predetermined distance and fixed by welding means.

.. are the main body ribs 12
A flat plate-shaped pushing rib that is fixed to the side end surface 12A of the movable support 4 by welding means and protrudes above the movable support 4 in a direction orthogonal to the installation direction of the cable A is shown. The rib fitting groove 7C is removably fitted into the rib fitting groove 7C.

Reference numerals 14 and 14 denote a pair of lifting ribs serving as lifting locks. The lifting ribs 14 and 14 are fixedly mounted on both side end surfaces 11A and 11A of the saddle body 11 and are fixed guide members. 1 is projected above.

Reference numeral 15 in the drawing denotes an upper lid which is fastened to the upper end of the saddle 9 by a bolt and holds the cable A between the saddle 9 and the upper lid.

Numerals 16 and 16 are jack pedestals located on both sides in the longitudinal direction of the fixed guide body 1 and fixed to the top 101A of the tower 101.

The apparatus according to this embodiment has the above-mentioned structure. Next, a method of installing the saddle 9 using the apparatus will be described. First, the fixed guide body 1 is attached to the top 1 of the tower 101.
It is fixed to the upper surface of 01A by fixing means such as bolts and welding,
The movable supports 4 are fitted and arranged on the Teflon plate 3 in the guide grooves 2A of the fixed guide 1. Next, the saddle 9 lifted by the crane is lowered to fit the pushing ribs 13 into the rib fitting groove 7C. As a result, the saddle 9 is supported by the pair of movable supports 4 and 4 in a state of being separated from the fixed guide body 1 by a small distance, and can be moved in the installation direction of the cable A.

Thus, since the saddle 9 functions as a movable type saddle when the cable A is installed, the movable supporting member 4 is moved by the pushing hydraulic jack 17 disposed between the jack receiving base 16 and the movable supporting member 4 of the tower 101. To adjust the saddle 9 to a predetermined position with respect to the top 101A of the tower 101. When the position adjustment work is completed, the saddle 9 is jacked up by the lifting hydraulic jack 18 to be separated from the movable support body 4, the saddle support base 7 is removed from the movable base 5, and the movable base 5 is removed from the fixed guide body 1. To do.

When the left and right movable supports 4 and 4 are removed, the saddle 9 is jacked down, and tightening bolts (not shown) are inserted into the bolt insertion holes 10A to fasten the base 10 to the fixed guide body 1. This completes the work of fixing the saddle 9 to the tower 101.

This embodiment is as described above in detail, and a plurality of pushing ribs 13, 13, ... Are fixed to the saddle 9, and the pushing ribs 13 are fitted to the movable support 4. Groove 7
Since it is configured to fit in C, the saddle 9 and the movable support 4 can be easily connected.

FIG. 6 shows a modification of the above embodiment.
In the figure, reference numeral 21 denotes a movable support, and the movable support 2
Reference numeral 1 denotes a long movable base 22 which slides in the guide groove 2A, and a plurality of saddle support arms 23 which are provided on the movable base 22 and project from the movable base 22 and extend on the base 10 of the saddle 9. 23
(Only one set is shown in the figure). And
The movable support member 21 has a fixing bolt 24 extending from a bolt insertion hole 23A formed in each saddle support arm 23 to the base 10.
24, ... The saddle support arm 23 is detachably connected to the saddle 9 by insertion screwing.

With this structure, even when the pushing rib 13 cannot be vertically fixed because the main rib 12 has a large inclination, the movable support 4 and the saddle 9 can be fixed.
Can be connected.

FIG. 7 shows a modification in which the main body rib 12 of the saddle 9 is vertical to the fixed guide body 1. In the figure, 31 is a movable support, and the movable support 31 corresponds to the elongated movable base 32 and the main body rib 12 of the saddle 9 and is erected on the movable base 32 with a predetermined space between them. A plurality of saddle support plates 33, 33, ... (Only one is shown in the figure) in which bolt insertion holes 33A, 33A ,. , 34. Then, four bolt insertion holes 33A are provided in the saddle support plate 33 in the vertical direction, and four bolt insertion holes 34A are provided in the connection plate 34 in the left-right direction and are provided in two rows in the vertical direction. The body rib 12 of the saddle 9 is also provided with bolt insertion holes (not shown) corresponding to the bolt insertion holes 34A on one side in a vertical direction.

With this structure, the saddle support plate 33 and the main body rib 12 are opposed to each other and sandwiched by the pair of connecting plates 34, 34 from both sides, and the corresponding bolt insertion holes 34 are provided.
The saddle 9 and the movable support 31 can be detachably connected by inserting the tightening bolt 35 into A, 33A, and 34A and tightening with a nut (not shown).

In the above embodiment, the fixed guide body 1 is described as a member separate from the tower 101 and fixed to the tower 101, but the fixed guide body 1 may be a member forming the upper end of the tower 101. .

Further, instead of the Teflon plate 3 and the sliding plate 6,
The bottom surface 2B of the guide groove 2A provided in the fixed guide body 1 and the lower surface 5A of the movable base 5 of the movable support body 4 are formed to be smooth and filled with lubricating oil such as grease to make the movable support body 4 slidable. Good.

Further, instead of the Teflon plate 3 and the stainless steel plate 6 of the embodiment, by disposing a plurality of rolling rollers in the guide groove 2A, the movable support can be moved with respect to the fixed guide 1. May be.

Furthermore, although the lifting ribs 14, 14 are provided on the saddle body 11 in the embodiment, the lifting hydraulic jack 1 is used.
It does not have to be rib-shaped as long as it is a protrusion capable of engaging with 8.

Further, although the saddle 9 is described as being fixed to the fixed guide body 1 by a tightening bolt, it may be fixed by welding means.

[0032]

The present invention has the following advantages because it is constructed as described above. (1) The saddle is movable when the cable is erected, but is fixed to the tower after the cable is erected, so that the strength is extremely higher than that of the conventional technique.

(2) Since the saddle is constructed so as to be fixed to the tower by the fixing means after the cable is erected, maintenance is unnecessary and it does not deteriorate over time, so that it has excellent durability.

(3) Since the saddle is placed and fixed directly on the fixed guide body on the upper surface of the tower, the saddle can be accurately positioned at a predetermined position with respect to the center of the tower, and the saddle can be placed on the upper surface of the tower. You can transmit power evenly.

(4) Since the saddle is fixed to the tower in a surface contact state via the fixed guide body, the reaction force transmission efficiency is good.

(5) Since the movable support is constructed such that it is removed after the saddle is placed on the fixed guide, it can be used repeatedly and the cost of the entire apparatus can be reduced.

[Brief description of drawings]

1 to 5 show an embodiment according to the present invention, and FIG. 1 is a front view of a saddle device for a suspension bridge.

FIG. 2 is a side view of a suspension bridge saddle device.

FIG. 3 is a partial external perspective view of a suspension bridge saddle device.

FIG. 4 is an operation explanatory view in the case of adjusting the suspension bridge saddle device in the cable installation direction.

FIG. 5 is an operation explanatory view when the suspension bridge saddle device is moved up and down.

FIG. 6 is a partial external perspective view of a suspension bridge saddle device according to a modified example of the embodiment.

FIG. 7 is a partial external perspective view of a suspension bridge saddle device according to another modification of the embodiment.

8 and 9 relate to a conventional technique, and FIG. 8 is a schematic explanatory diagram of a movable suspension bridge saddle device.

FIG. 9 is an explanatory diagram showing a method of fixing a movable suspension bridge saddle device.

[Explanation of symbols]

 1 Fixed guide body 2A Guide groove 4, 21, 31 Movable support body 7 Saddle support stand 9 Saddle 13 Pushing rib 14 Elevating rib 23 Saddle support arm 33 Saddle support plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuya Tanaka 4-31-1, Washibetsu-cho, Noboribetsu-shi, Hokkaido (72) Inventor Takashi Shinoda 6-chome 105-39 Hiraoka, Toyohira-ku, Sapporo, Hokkaido 105-39 (72) Inventor Yasuhiro Higashi 2-4-4-35, Atsubetsu Higashi, Atsubetsu-ku, Sapporo-shi, Hokkaido (56) Bibliographic references Sho 30-2043 (JP, Y1) Sho 56-55284 (JP, Y2)

Claims (3)

(57) [Claims] 1. A step of placing a movable support body on a fixed guide body provided at an upper end of a tower so that the movable support body can advance and retreat in a cable erection direction, and a saddle supported by the movable support body in a state of being separated from the fixed guide body. A step of mounting the cable on the saddle, placing the saddle on a fixed guide body, and removing the movable support body from the fixed guide body; and a step of fixing the saddle to the fixed guide body. Installation method of saddle for suspension bridge. 2. A fixed guide body fixed to the upper end of the tower and provided with a pair of support body guide portions on the upper surface side along the cable erection direction, and mounted on the fixed guide body and fixed by a fixing means. A possible saddle, a saddle support for releasably engaging the saddle to support the saddle away from the fixed guide body, and a lifting lock for separating the saddle from the fixed guide body For a suspension bridge, which has a pair of movable support bodies that are mounted on the fixed guide body so as to be movable and guided by the support guide portion. Saddle device. 3. The suspension bridge saddle device according to claim 2, wherein a sliding member is provided on a support body guide portion of the fixed guide body, and a sliding member is provided on the movable support body so as to be in contact with the sliding contact member. .