JPH083920A - Mountain suspension bridge - Google Patents

Abstract

PURPOSE:To make it possible to install a grand suspension bridge at a high elevation relatively easily and at a low cost, and what is more, in safety by making available natural topographical features without damaging a natural view by installing anchor blocks to the upper part of a tunnel on a slope of a mountain where the tunnel is to be penetrated through and fixing one end of a main cable or a diagonal tension cable directly. CONSTITUTION:Blocks 5 and 6 are mounted two by two halfway on opposed slopes of mountains 1 and 2 which are excavated and finished as tunnels 3 and 4 which are designed to connect each of car roads. The slopes of the mountains are excavated where an anchor frame which fixes the end of a cable is installed into excavated holes into which fill concrete is cast and the end of each of two main cables is fixed therewith. The ends of a plurality of suspension cables whose length is preliminarily calculated are mounted to each main cable 7 and a floor board 9 which forms a road is fixed with the lower end of the cable at many points. The anchor blocks 5 and 6 are installed to the both sides of the floor board so that they may be opened, thereby stretching each of the suspension cables on the slant in such a fashion that they may expand to the width of the floor board 9 at the mountain side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension bridge for mountains, which forms a road or a railway by connecting tunnels that penetrate mountains.

[0002]

2. Description of the Related Art Conventionally, bridges have been constructed for connecting roads and railways above valleys by connecting tunnels that pass through mountains. In such bridges, it is necessary to support floor slabs so that they are erected between abutments and piers and between piers, so bridges that connect between tunnels in mountainous areas should have high piers that correspond to the depth of the valley. Will be built.

[0003]

However, scaffolding is generally extremely poor in such mountain valleys, and many work roads are required to build a large number of high piers, making it difficult to secure safety. Not only that, but there was a problem that the construction period became longer due to the deterioration of work efficiency, the construction cost increased, and the natural landscape was greatly destroyed.

The present invention has been made in order to solve the above-mentioned conventional problems, and utilizes the principle of long suspension bridges and cable-stayed bridges and the natural terrain of mountains to make it relatively easy and safe between a plurality of mountains. Moreover, it is an object of the present invention to provide a suspension bridge for mountains, which allows roads and railways to be constructed at low cost without significantly damaging the natural landscape.

Another object of the present invention is to provide a suspension bridge for mountains, which can sufficiently suppress rolling even when the main ropes and cable-stayed cables become long.

[0006]

A mountain suspension bridge according to the present invention is provided with an anchor block on a slope of a mountain which is above a tunnel and through which the tunnel penetrates, and the anchor block is provided with a main rope or cable-stayed cable. One end is directly fixed.

In the mountain suspension bridge according to the present invention, the anchor blocks are provided at two separate locations on the upper slope of the mountain sandwiching the tunnel so as to sandwich the tunnel, and one main rope or each rope is provided for each anchor block. One set of cable-stayed cables is separately fixed at one end.

[0008]

In the mountain suspension bridge of the present invention, an anchor block is installed on the slope of at least one of the mountains on both sides, and one end of the main rope or cable-stayed cable is supported and fixed to this anchor block, and provided on this main rope. By supporting the floor slabs for roads and railways at the other end of the suspension lines and cable-stayed cables, the natural terrain can be used to make long suspension bridges at high places at a relatively low cost and without damaging the natural landscape. Allows erection.

Further, in the present invention, two main ropes or two ropes are used.
It is possible to prevent rolling of the suspension bridge by separately fixing the pair of cable-stayed cables to the anchor blocks that are provided separately on the mountain slope.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front cross-sectional view and a plan view of a mountain suspension bridge showing an embodiment of the present invention. Mountains 1 and 2 in which tunnels 3 and 4 such as automobile roads to be connected to each other are excavated and formed. Two anchor blocks 5 and 6 are formed in the middle abdomen of the slopes facing each other.

These anchor blocks 5 and 6 are formed by forming holes in the above slopes, installing an anchor frame for fixing the cable end therein, and then pouring in concrete. The ends of the two main ropes 7 are fixed. In this fixing, it is optional to provide a saddle on the anchor blocks 5 and 6 for supporting a part of the end of the main rope 7.

The distance between the anchor blocks 5 and 6 is, for example, 100 m to 2000 m, and is installed at a height of 60 m with respect to the road surface in the tunnels 3 and 4 provided in the mountains 1 and 2. The height of the floor slab, which will be the road described below, from the valley bottom is, for example, 50 m to 100 m.

Further, each of the main ropes 7 is attached with one end of a plurality of suspension ropes 8 having a length calculated in advance, and a plurality of floor slabs 9 forming a road are provided at the lower ends of these suspension ropes 8. It is fixed at the point.

In this case, since the anchor blocks 5 and 5 on the mountain 1 and the anchor blocks 6 and 6 on the mountain 2 are provided so as to open on both sides of the floor slab 9, respectively, the suspension ropes 8 are provided. Is also stretched in an oblique direction so as to gradually widen toward the mountain side with respect to the width of the floor slab 9.

In the mountain suspension bridge having such a structure, since the main siding 7 and the floor slab 9 are only bridged between the slopes of the two mountains 1 and 2, like a conventional mountain bridge,
It is possible to eliminate the construction work of dangerous and inefficient high piers (for example, 4 to 5 are required for spans of 500m) and main towers of general long suspension bridges on the valley floor where the scaffolding is poor. Since the shape and position of 6 and the like can be freely selected, it is possible to suppress damage to the natural landscape as much as possible.

Further, the anchor blocks 5 and 6 are mountains 1 and 1, respectively.
By providing two for each two, it is possible to tension so that both ends of the main rope 7 are opened. Therefore, the sway of one main rope 7 can be suppressed by the tension force of the other main rope 7, and the floor slab as a whole It is possible to obtain an advantage that the rolling of 9 can be effectively suppressed.

Further, the suspension bridge is constructed at the height of the mountain,
Since it can be done regardless of the topography and depth of the valley, it can almost clear various obstacles in bridge construction, and it is safe even if it is long.
It is extremely advantageous for civil engineering construction from the viewpoint of shortening the construction period and economical efficiency.

FIG. 3 is a plan view showing another embodiment of the present invention. In this embodiment, instead of fixing the two main ropes 7 to the anchor blocks 5 and 6 for each of the mountains 1 and 2, as in the above-described embodiment, one to each of the mountains 1 and 2 is fixed. , Anchor blocks 5A, 6A larger than the width of the bridge are used for fixing. Therefore, in this embodiment, for example, when the distance between the anchor blocks 5A and 6A is short and there is no concern that the floor slab 9 itself sways significantly due to wind, or when the mountains 1 and 2 are small, the installation is performed under the conditions. It is advantageous.

FIG. 4 shows still another embodiment of the present invention. In this embodiment, the anchor blocks 5B and 6B are made smaller than those described above, and the widths of the two main ropes 7 are made substantially equal to the width of the floor slab 9. Therefore, in this embodiment, the floor slab 9 is suitable for a small suspension bridge used under natural conditions in which there is no fear of significant shaking.

5 and 6 show another embodiment of the present invention. In this embodiment, when one of the two mountains 1 and 2 is higher than the mountain 1, the present invention is applied to the higher mountain 2.
It is an application example when it is applied to.

That is, in this embodiment, a main tower 10 is established on the side of the lower mountain 1 according to the height of the anchor block 6 constructed on another mountain 2 as usual, and the main ropes are mounted on this main tower 10. After supporting 7 once, one end of the main rope 7 is fixed to one anchor block 5C formed on the plateau of the low mountain 1, but the high mountain 2 is shown in FIG. The same embodiment of the present invention is used.

In this embodiment, even if the height is different or there is no slope and it is a plateau, the floor slab is suspended by a balanced load over the entire length of the main rope 7. Will be possible. The main tower 10 is provided with foundation work and skeleton work to withstand the desired vertical load on the ground.

7 and 8 show another embodiment of the present invention. This embodiment does not use the main ropes 7, but instead of this, a plurality of cable-stayed cables 11 each having one end fixed to anchor blocks 5 and 6 separated by two for each mountain 1 and 2. , 12 to support the floor slab 9. In this embodiment, the cable-stayed cables 11 and 12 are attached to the floor slab 9 so as to support both sides of the floor slab 9 at regular intervals over the entire length.

According to this embodiment, the cable-stayed cable 11,
Since 12 supports the entire length of the floor slab 9 in a tensioned state, the rolling of the floor slab 9 due to wind or the like is extremely small, and it is extremely effective when applied to a long suspension bridge in a mountain area exposed to strong wind.

Although not shown, the cable-stayed cable 1 is also provided.
Each end of the floor slab 9 can be fixed to the left half and the right half of the floor slab 9 so that the loads of the left half and the right half of the floor slab 9 are separately shared. In this case, as compared with the case where the cable-stayed cables 11 and 12 are fixed over the entire length of the floor slab 9, the actual usage amount of the cable-stayed cables 11 and 12 can be reduced, the cost can be reduced, and the erection length can be increased. It is effective when used at short distances or in mountainous areas where strong winds are less likely to occur.

FIG. 9 shows another embodiment of the present invention.
This is because when the mountain 1 is lower than the mountain 2, the conventional main tower is installed on the plateau of the mountain 1 and the height of the anchor block 6 on which the invention is applied to the mountain 2, for example from the tunnel 3 The main tower 13 with a height of 60 m is established.
One end of each of the cable-stayed cables 11 and 12 is fixed to the anchor block 5A and the anchor block 6 via the cable 3. In this embodiment, the distance between the main tower 13 and the anchor block 6 is 250 m, for example.

Also, in this embodiment, each cable-stayed cable 1 is
The other ends of 1 and 12 are attached to both sides of the floor slab 9 so as to support the left half and the right half of the floor slab 9, respectively. Further, as shown in FIG. 10, one anchor block 6 facing each other is provided for one main tower 13, and this embodiment is economical and economical when applied to a small suspension bridge having a relatively short span. It is advantageous in terms of workability.

As shown in FIG. 11, when one end (left end) of the floor slab 9 is supported by a bridge abutment at the road end, a pair of anchor blocks 6 on one mountain 2 side is used.
By the lower end of the cable-stayed cable 12 whose one end is fixed to
It is also optional to have a structure in which only the right half of the floor slab 9 is supported. In this case, when applied to a suspension bridge in which one is a plateau (flat) and the other is a mountain 2, it is advantageous in terms of workability and economy.

[0029]

As described above, according to the present invention, the anchor block is provided above the tunnel and on the slope of the mountain through which the tunnel penetrates, and one end of the main rope or the cable cable is attached to the anchor block. Since it is configured to be fixed directly, the principle of long suspension bridges and cable-stayed bridges and the natural terrain of the mountains can be used to make roads and railroads cheaper and relatively easy and safe without damaging the natural landscape. There is an effect that what can be installed is obtained. Also, the position of the anchor,
Since the suspension method can be freely selected, the degree of freedom in designing a bridge with a desirable design that takes the landscape into consideration is dramatically increased.

Further, in the present invention, the anchor blocks are separated from each other on the slope of the mountain so as to sandwich the tunnel, and are provided at two positions, and each of these anchor blocks has one main rope or one set of cable-stayed cables. By fixing one end of each of them separately, it is possible to obtain an effect that can sufficiently suppress rolling of the suspension bridge even if it receives a side wind.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a mountain suspension bridge according to an embodiment of the present invention.

FIG. 2 is a plan view of the mountain suspension bridge shown in FIG.

FIG. 3 is a plan view of a mountain suspension bridge according to another embodiment of the present invention.

FIG. 4 is a plan view of a mountain suspension bridge according to still another embodiment of the present invention.

FIG. 5 is a front sectional view showing a mountain suspension bridge according to still another embodiment of the present invention.

FIG. 6 is a plan view of the mountain suspension bridge shown in FIG.

FIG. 7 is a front sectional view showing a mountain suspension bridge according to another embodiment of the present invention.

8 is a plan view of the mountain suspension bridge shown in FIG. 7. FIG.

FIG. 9 is a front sectional view showing a mountain suspension bridge according to still another embodiment of the present invention.

10 is a plan view of the mountain suspension bridge shown in FIG. 9. FIG.

FIG. 11 is a plan view of a mountain suspension bridge according to still another embodiment of the present invention.

[Explanation of symbols]

1,2 Mountains 3,4 Tunnels 5,6,5A, 6A, 5B, 6B, 5C Anchor block 7 Main rope 8 Suspension rope 9 Floor slab 10,13 Main tower 11,12 Cable-stayed cable

Claims (2)

[Claims] 1. A suspension bridge for mountains, characterized in that an anchor block is provided above the tunnel on the slope of a mountain through which the tunnel penetrates, and one end of a main rope or cable-stayed cable is directly fixed to the anchor block. . 2. Anchor blocks are provided at two separate locations on a slope of a mountain so as to sandwich a tunnel, and each of these anchor blocks has one main rope or one end of each set of cable-stayed cables separately. The mountain suspension bridge according to claim 1, wherein the suspension bridge is fixed to.