JPH0892945A - Dam construction method - Google Patents

Abstract

PURPOSE: To execute construction work especially, during a rainy weather and move a roof easily in conformity with changes in a construction area and execute work in a wide range and embody a construction method which is not affected by weather and enhance workability and save construction cost when constructing a dam which is a large structure. CONSTITUTION: A movable carrier device K is installed, which moves along a main wire M extending alone the longitudinal direction of a dam D while a roof Y is suspended by way of this carrier device K. Accompanied by changes in a construction area, the carrier device K is moved by a transfer means, thereby executing construction work while the roof Y is being moved in the longitudinal direction of the dam D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dam construction method suitable for construction of a dam having a large structure, particularly when used for construction in rainy weather.

[0002]

BACKGROUND OF THE INVENTION Dams, known as giant structures,
It is constructed as a structure that creates a reservoir for water use or flood control such as power generation, flood control, irrigation, water supply, industrial water, etc. It is roughly classified into concrete dams and fill dams according to the materials used. In addition, concrete dams are classified into arch dams, gravity dams, hollow gravity dams, buttress dams, etc. according to their structural type, and fill dams made by stacking soil materials and rocks are of uniform type, zone type, surface impermeable type, etc. It is classified.

In the construction of a dam having such a huge structure, for example, in a rockfill dam, a clayey soil material having a water-impervious property is used inside the dam body in the height direction of the dam body. It is constructed by constructing a water shield wall that extends along the axis of the dam, and at the same time, stacking rock materials and gravel on the upstream and downstream sides of the water shield wall. In addition, for example, in a concrete dam, a layer system construction method in which a plurality of horizontal joints orthogonal to the dam axis are provided, and the area divided by these horizontal joints is sequentially placed into each block as a block unit It is constructed by the block system construction method, etc. where a joint is provided.

[0004]

By the way, since the construction of a huge structure such as a dam is carried out in the open air,
During the construction period, it is often affected by the weather, and especially when the rain continues for many days, the process is often significantly delayed. Since the delay in the process directly affects the construction cost, it has been strongly desired to develop a construction method which can be carried out regardless of the weather.

In particular, in the work of filling and compressing the soil material which becomes the core material like a fill dam, it is only necessary to cover the core material portion with a curing sheet, for example, every time it rains. Inevitably, the construction work must be interrupted or abandoned.In addition, when the curing sheet is removed after the weather is restored, the curing sheet becomes dirty and heavy due to the adhesion of the core material, and it is difficult to manually extend and store it. However, in any case, it was necessary to develop a construction method that can be used even in rainy weather.

[0006] Here, as a method for performing construction in rainy weather or curing after construction, a method of constructing a temporary roof for the rain to cover the construction range at the construction site or setting up an assembling tent is also considered. However, installing such temporary roofs and tents over a fairly wide area has a problem of enormous labor and cost, and further, disassembling and assembling the roof is required as the construction area changes. In this case, the conventional method of waiting for the recovery of the weather may be advantageous. Further, for example, the temporary roof may be hung above the construction area so as not to disturb the construction. However, by simply suspending the temporary roof, it can be stored in a safe place when it is not needed or in strong winds, or it can be moved when it is an obstacle, but most of the work requires a human power. Poor handling and inconvenience.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and in the construction of a dam having a large structure,
In addition to being able to perform normal work such as construction and curing especially in rainy weather, the roof can be easily moved as the construction area changes, enabling a wide range of construction, which is not affected by the weather. It is an object of the present invention to provide a dam construction method capable of realizing the construction method, improving the workability, and reducing the construction cost.

[0008]

Means and Actions for Solving the Problems In the present invention,
A main wire extending along the dam's axial direction is installed above the dam to be constructed, the roof is hung from this main wire, and the roof is covered with the construction area of the dam to be constructed. A construction method, in which a carrier device movable along the main wire is provided, the roof is hung through the carrier device, and the roof is moved by moving the carrier device as the construction area changes. Construction is performed while moving in the dam axis direction. In this way, since the construction area is covered by the roof, it is possible to perform normal construction and curing work even in rainy weather as in fine weather. And by installing the main wire so as to extend in the dam axis direction,
Since the roof itself will be moved while moving in the axial direction of the dam, it will be possible to perform continuous construction over a wide range with a single suspended roof.

Further, in the present invention, a method is adopted in which the roof is configured to be movable up and down, and as the construction of the dam progresses, the roof is moved up and down in accordance with the height of the construction area of the dam. To be In this way, the vertical position of the roof can be freely adjusted as needed with respect to the height of the dam that is stacked or launched as the construction proceeds. In addition, when using a large machine under the roof, raise the roof higher, while lowering it on days with strong wind and rain, lowering it to just above the ground during curing, and raising it on high days when the weather is good. It can be adjusted in consideration of construction efficiency.

When the dam to be constructed is a fill dam, the main wire is installed above the water blocking wall forming the core of the fill dam. Since the impermeable wall that forms the core part that is a soil material usually extends in the dam axis direction with a certain width, it is desirable to adopt the method of moving the roof in the dam axis direction.
In that case, the width of the roof in the direction intersecting with the dam axis may be a little larger than the width of the impermeable wall portion, which is preferable from the viewpoint of downsizing of the roof.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying FIGS. The dam construction method according to the embodiment is applied to the fill dam construction method, in which a main wire M extending along the dam axial direction of the dam D is installed above the dam D to be constructed. A method for constructing a dam in which a roof Y is hung from a main wire M, and a construction area is covered with the roof Y, and a carrier device K movable along the main wire M is provided, and the carrier device K is provided. The roof Y is suspended via the device K, and the carrier device K is moved by the moving means 10 as the construction area changes, whereby the roof D is constructed while moving in the axial direction of the dam. .

Explaining these details, the main wire M is installed above the dam D to be constructed so as to extend along the dam axial direction of the dam D. That is, in FIG. 1, reaction force structures 1 and 2 are respectively provided in the upper part of the slope ground which becomes the opposite bank on the left and right, and the main wire M is installed between these reaction force structures 1 and 2. Dam D, as shown in FIG.
An example of a so-called rock fill dam having an impermeable wall 3 formed of a central core material provided inside the bank body and extending in the axial direction of the dam, and lock members 4 and 5 provided on the upstream side and the downstream side of the impermeable wall 3 is an example. It is shown. Therefore, the main wire M is located right above the widthwise center of the impermeable wall 3 and is installed so as to extend in the dam axis direction.

The carrier device K in this embodiment is
Five carriers k1, k1, ... Are arranged at intervals in the length direction of the main wire M, and these carriers k1 are connected by a connecting means 20 so that they can approach and separate from each other. A mechanically expandable member can be used as the connecting means 20, but here,
A wire 21 which is a rigging material that is lightweight, tough and flexible is used, and both ends thereof are connected to the adjacent carriers k1 and k1. Further, as the moving means 10 of the carrier device K, here, a pair of lead wires 11, 11 are used, and one end of each of them is one of the five carriers k1 and the carrier k1 closer to one reaction force structure part 1 is used. And a carrier k1 close to the other reaction force structure portion 2, and the other end thereof is wound around a winch drum or the like (not shown) provided in the reaction force structure portions 1 and 2. It is said that.

Each carrier k1 has the same structure,
Two wheels 31, 31 provided on the upper side of the rectangular frame-shaped main body 30 for traveling on the main wire,
The fixed pulleys 32, 32 are provided on the lower side of the main body 30 for suspending the roof Y by the suspension wires 40. The suspension wire 40 is composed of a single wire that passes through the constant pulleys 32, 32 of each carrier k1, and both ends thereof are wound around a winch drum or the like provided in the reaction force structures 1 and 2, respectively. However, at the same time, the five moving pulleys 50, 50, ..., Which are respectively located in the portions between the constant pulleys 32, 32 of each carrier k1, are also arranged. As a result, the fixed pulley 3 of each carrier k1
A double whip type moving pulley 50 using a suspension wire 40 is formed between the two and 32, respectively. A suspension rope 60 for directly suspending the roof Y is connected to each movable pulley 50.

The roof Y extends in a horizontal direction intersecting the lengthwise direction of the main wire M, and a plurality of roof frames 70 arranged at intervals in the lengthwise direction of the main wire M, and these roofs. A waterproof roof sheet 80 that covers the frames 70 and connects the roof frames 70 together. In this embodiment, the roof frame 70 includes an upper chord member 71 which is curved upward in a gentle arc shape so that the roof sheet 80 retains the shape of the roof.
⅓ length, both ends of which are fixed lower chord members 72 fixed to the lower surface side of the upper chord member 71, and the upper chord member 71 and the lower chord member 72 located in the central portion in the longitudinal direction between them. In consideration of weight reduction of the whole, it is made of, for example, a square or round pipe material made of aluminum alloy. Further, in order to prevent the weight of each roof frame 70 from acting on the seat 80, the roof frames 70 are connected to each other at a plurality of positions in the length direction of the roof frame 70 by a flexible connecting rope 85 such as a rope. They are interconnected.

This roof frame 70 has the above-mentioned carrier k.
Five roof frames 70 are arranged corresponding to the number of 1 and each of the roof frames 70 is individually hung via the hanging ropes 60 in a form corresponding to each carrier k1. The hanging rope 60 does not concentrate an eccentric load or a local excessive stress on the roof frame 70, and can be hung in a stable state.
The roof frame 70 is configured to be hung at a total of three places, one at the center in the longitudinal direction and two at positions closer to the center than both ends thereof.

As the roof sheet 80, for example, a general waterproof sheet may be used, but in consideration of workability and certainty when the entire roof Y is expanded or contracted, a shape that responds to humidity, for example, is used. It is desirable to use a memory sheet. As a memory mode of this shape memory sheet, one having a property of expanding when so-called wet when receiving rainwater and contracting when dried is preferable. That is, it is preferable that the roof sheet 80 is stretched so as to retain the shape of the roof when it is stretched, and contracted so as to retain the shape when the roof is folded when it is contracted. In addition, each roof frame 70
Also for the connecting rope 85 that connects the members to each other, a so-called shape memory rope having the same shape memory characteristic as the roof sheet 80 may be used.

A skirt sheet 90 is provided around the roof Y, if necessary, in order to prevent wind and rain driving. The bottom sheet 90 is provided with a permanent magnet, for example, on the lower side thereof, and the weight 10 made of H steel or the like is arranged below the roof Y.
It can be temporarily fixed by adhering it to 0. A shape memory sheet can also be used for the bottom sheet 90. In that case, this hem sheet 9
It is desirable that 0 has a constitution in which it is wound into a roll when dried and stretches when wet. Further, in order to provide the hem sheet 90, for example, a small pulley is attached to the end of the roof frame 70 and a detachable structure in which the roof frame 70 is wound up with a rope is used, thereby hindering the expansion and contraction operations of the roof Y. Can be installed without In FIG. 1 and FIG. 2, reference numerals 101 and 102 indicate a tension line for stably holding the roof Y, and reference numeral 110 indicates a maintenance pit of the roof Y, respectively.

The roof Y is maintained in the maintenance pit 11 in a contracted state when the weather does not require it.
Store in 0. Then, when it is necessary in rainy weather, one of the pull-out wires 11 is wound and the other of the pull-out wires 11 is unwound,
The roof Y is moved above the construction position. At this point,
The five carriers k1 that are connected by the wires 21 that form the connecting means 20 are in a state of being close to each other and substantially adhering to each other.

When the roof Y is located above the construction position, the carrier device K is pulled to the left and right (dam axis direction) by winding both or one of the pull-out wires 11, 11. This is performed until the wire 21 connecting the k1s extends. Then, along with the expansion of the carrier device K, the roof Y is also expanded to be in the expanded state as shown in FIG.

Next, the suspension wire 40 is unwound, and FIG.
As shown in FIG. 3, the roof Y is lowered to a desired height, and is fixed with tension lines 101 and 102. Here, if the hem sheet 90 is a normal sheet, the lower edge of the hem sheet 90 is bonded to a weight 100 arranged under the roof Y with a magnet for positioning. If the hem sheet 90 is a shape memory sheet, the hem sheet 90 waits for the sheet to fully extend before being bonded with a magnet. In addition, when the construction under the roof Y is completed and this part is cured, the roof Y may be lowered to the ground. Further, when moving to the next construction area, the pull-out wires 11, 11 and the hanging wire 40 may be operated to move the roof Y to the construction area.

When the roof Y is to be stored, the tension rope 1
01 and 102 are removed, the hem part sheet 90 is separated from the weight 100, at least one of the pull-out wires 11 and 11 is loosened, and the hanging wire 40 is wound. Then,
The carriers k1 are gathered by the weight of the suspended load, that is, the weight of the roof Y so as to approach one place, and accordingly, the roof Y is also contracted in the dam axis direction and automatically folded. Then, in this state, the hanging wire 40 is further wound up, and the entire roof Y is hoisted up. Thereafter, while the winding wire 11 is wound up, the hanging wire 40 is not loosened and the roof Y is maintained in the maintenance pit 110.
Move it to the side and store it there.

In the examples, the fill dam is shown as an example of the structure to be constructed. For example, concrete dams, dams of other types, construction of other civil engineering structures, foundation work of large buildings, etc. Can also be applied if necessary.

[0024]

As described above, in the present invention, the main wire extending along the dam axial direction of the dam is installed above the dam to be constructed, and the main wire is movable along this main wire. With a good carrier,
The roof is suspended via the carrier, and the carrier is moved as the construction area changes, whereby the roof is moved in the axial direction of the dam for construction. Therefore, in construction of a dam that is a large structure, not only can normal work such as construction and curing be performed in rainy weather as well as in sunny weather, but the roof can be easily constructed as the construction area changes. It can be moved over a wide range to allow construction to be carried out, which makes it possible to realize a construction method that is not affected by the weather, improve construction efficiency, and reduce construction costs.

Further, in the present invention, the roof is configured to be movable up and down, and as the construction of the dam progresses, the roof is moved up and down in accordance with the height of the construction area of the dam. Therefore, it is possible to construct a dam whose height of the levee increases as the construction progresses, while freely adjusting the vertical position of the roof as necessary. Therefore, when using a large machine under the roof, raise the roof higher, while lowering it on days with strong wind and rain, lowering it to just above ground during curing, and raising it on high days when the weather is good. It is possible to perform construction while considering construction efficiency.

In particular, when the dam to be constructed is a fill dam, the main wire is installed above the impermeable wall forming the core portion of the fill dam to construct the roof so that the roof is dam shaft. It is extremely effective when using a method of moving the roof in that direction, and in that case, the width of the roof in the direction intersecting the dam axis may be a little larger than the width of the impermeable wall, so the roof should be It is also effective in that it can be miniaturized.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged front view of a carrier device portion.

FIG. 4 is an enlarged front view of the roof.

[Explanation of symbols]

 M main wire D dam K carrier device Y roof 10 moving means 20 connecting means 40 suspension wire 50 moving pulley 80 roof sheet

Claims (3)

[Claims] 1. A main wire extending along the dam axial direction of the dam is installed above the dam to be constructed, a roof is hung from this main wire, and the construction area is covered by the roof. A method of constructing a dam while constructing a dam, in which a carrier device movable along the main wire is provided, and the roof is hung through the carrier device, and the carrier device changes as the construction area changes. The method for constructing a dam, characterized in that construction is performed while moving the roof in the axial direction of the dam by moving the roof. 2. The roof is configured to be movable up and down, and as the construction of the dam progresses, the roof is constructed so as to move up and down in correspondence with the height of the construction area of the dam. The dam construction method according to claim 1. 3. The dam according to claim 1, wherein the dam to be constructed is a fill dam, and the main wire is installed above a water blocking wall forming a core portion of the fill dam. Roof device for all-weather construction.