JPH06307126A - Floating roof and its erection - Google Patents

Abstract

PURPOSE:To shutt out rain or snow, by erecting a temporary roof on a filled-up face of a core, in a banking construction of a fill-dam. CONSTITUTION:A floating roof 10 in which a plurality of floating roof units 11 are arranged in a connected state is erected on the filled-up face of the core in a zone type dam 1. A square sheet 20 is jointed to the top of a balloon 12 in which helium gas or the like can be charged and provided with a water- tight ability preventing rain or snow. The size of sheet 20 is large enough not to slip out from a net 30 opening and also can be supported by the net 30. The net is connected to the balloon 12 by wires with a specified length and the net constitutes the frame work of a temporary roof structure. And further, the sheet 20 and the net 30 are connected to the balloon 12 respectively and actuated by the floating force of balloon. The peripheral edge of the net 30 is fastened to the ground by wires 33 for anchors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-weather temporary roof suitable for civil engineering and construction work, and a method for constructing it, and more particularly to a floating roof constructed by expanding a roof sheet in the air by utilizing the buoyancy of a balloon. And the erection method.

[0002]

2. Description of the Related Art For example, a zone-type fill dam, which has a large track record as a large-scale dam, has a water-blocking zone made of a soil material in its central core.
Soil material adjusted to near the optimum water content ratio is unwound to a specified thickness and compacted by a heavy machine to form a pile. In the rising work, it is necessary to strictly control the water content ratio of the soil material, and conventionally, the construction was suspended on a rainy day or a snowy day.
Also, depending on the amount of rainfall, during the latter half of the rainfall or for several days, the aeration was stopped due to aeration, or the soil material that had been raised up was stripped to some extent.

As described above, in the fill dam core raising work, a method for enabling all-weather construction has not been established yet, but in the construction field, conventionally, an air film has been used as an all-weather temporary roof. Methods and steel building methods are known.

[0004] For example, the steel building method has been used in construction of a concrete dam in a cold region such as Canada, but the cost is inevitably high because the building is constructed. In addition, a sheet hanging method is also known in which a cable is stretched on both banks of a dam site and a tent is hung on this cable, but a hanging structure with a cable becomes a large-scale facility,
There is a dislike of lacking in practicality.

On the other hand, a roof which is not a temporary roof for civil engineering / construction work, but which is easy to construct and remove by utilizing the buoyancy of a balloon is also known as a roof for a building having a large plane and a large entrance / exit such as an aircraft hangar. (Japanese Patent Laid-Open No. 4-38379).

[0006]

[Problems to be Solved by the Invention] In the core building work of the fill dam, etc., if it is possible to block rain and snow by placing a temporary roof on the core building surface, it is possible to increase the number of workable days. The construction period can be shortened and the construction cost can be significantly reduced.

Therefore, an object of the present invention is to provide an all-weather construction for outdoor civil engineering / construction work that is easily affected by rain and snow, and to use a buoyancy of a balloon to construct a temporary roof with a simple structure. And a method of constructing the same.

[0008]

The floating roof of the present invention comprises a roof sheet, a net for supporting the sheet from below, a balloon connected to the net and filled with a gas having a density lower than the atmosphere.
It is characterized by comprising a locking means for locking the net to the ground against the buoyancy of the balloon. Further, in this floating roof, the roof sheet is preferably joined to the top of the balloon, and the roof sheet preferably has an air film structure.

The method of constructing a floating roof according to the present invention comprises a roof sheet constituting a floating roof at the top of the balloon, and connecting the net having a mesh smaller than the diameter of the balloon when inflated to raise the balloon. After that, the balloon is deformed to move through the mesh of the net from below to above, and again, the roof sheet is expanded on the net by moving through the mesh in the opposite direction, and then gas is supplied to the balloon. It is characterized by being infused and inflated so that the balloon supports the net from below the mesh.

[0010]

The present invention will be described in detail below by taking a case where a temporary roof is hung on the core rising surface of a zone type fill dam as an example.

FIG. 1 is an overall perspective view showing a state in which a floating roof 10 is installed on the core rising surface of the zone type dam 1. The zone-type dam 1 has a core part (impermeable zone) 2 made of a soil material in the center part, and a filter part (semi-permeable zone) 3 for preventing piping and avoiding a sudden change in mechanical properties on both sides thereof. Further, a lock portion (water permeable zone) 4 made of a coarse-grained material having a large shear strength is arranged further outside thereof. As described above, especially in the construction of the core portion, it is important to control the water content ratio of the soil material. Therefore, the floating roof 10 of the present invention is erected on the core rising surface.

In FIG. 1, a floating roof 10 is formed by connecting a plurality of floating roof units 11 and connecting them to each other.
Must be large enough to cover almost the entire area (or part of it). In this embodiment, it depends on the scale of the dam, but it is 60m ×
The floating roof 10 having a size of 60 m was used.

First, the structure of the floating roof unit 11 is shown in FIG.
It will be described based on. Reference numeral 12 is a balloon in which a gas having a smaller specific gravity than the atmosphere, such as helium gas or hot air, is enclosed. The balloon 12 is connected to a gas supply device 13 installed on the ground by a line 15, and the line 15 is connected to a valve 14 provided at the end of the gas supply device 13 to supply or recover gas on the ground. It is possible to do it.

A square sheet 20 is provided on the top portion 19 of the balloon 12.
The central part of is joined. The seat 20 is required to have water impermeability that can prevent rain and snow and be flexible enough to be easily spread by remote control from the ground. In this embodiment, an air film structure is adopted so that it can be easily expanded or converged. That is, the seat 20 is connected to the compressed air supply device 23 installed on the ground by the line 25, and the line 25 is connected to the valve 24 provided at the end of the compressed air supply device 23 to supply the compressed air or The discharge can be done on the ground.

The size of the seat 20 is such that it can be supported by the net 30 without falling off from the mesh of the net 30 which will be described later in the expanded state.

The net 30 used in this embodiment has an overall size of 60 m × 60 m, as described above, and is smaller than the diameter of the inflated balloon 12, so that the seat 20 has a smaller size.
It has a square mesh shorter than the length of one side. There is no particular limitation on the shape of the mesh, and a polygonal shape such as a triangle or a hexagon can be adopted to form a framework of a temporary roof structure described later.

The net 30 is connected to the balloon 12 by a wire (or rope) 31 having a predetermined length. Therefore,
The seat 20 and the net 30 are respectively connected to the balloon 12, and the buoyancy of the balloon 12 acts.

The net 30 is constructed by assembling wires and ropes in a net shape, and as shown in FIG.
The wire 33 for the anchor is provided with an appropriate interval at the periphery of the
Has been tightened to the above-ground part.

Next, a method of constructing the floating roof 10 will be described.

Preparatory work On the raised surface on the ground, a required number of floating roof units 11 are temporarily placed under the net 30 assembled to a predetermined size.
The floating roof unit 11 fastens the balloon 12 and the net 30 with the wire 31 so that the floating roof unit 11 can be arranged in a staggered manner with respect to each mesh of the net 30.

The truck equipped with the roof floating gas supply device 13 is moved to the side of the balloon 12 and the line 15 of the balloon 12 is connected to the gas supply device 13.
The valve 14 is opened and helium gas is injected into each balloon 12. When the total buoyancy of each balloon 12 exceeds the total weight of the floating roof 10 including the weight of the net 30, the seat 20 and the net 30 are integrated with the balloon 12, so that the entire floating roof 10 is in the air. Surface. The floating roof 10 is tied to the ground by a wire 33 and stops above a predetermined height.

Upward movement of the balloon position In the state where the entire floating roof 10 is floated in the air, the floating roof unit 11 is, as shown in the left half of FIG. 3 (a),
The expanded balloon 12 supports the net 30 from below the mesh with the seat 20 interposed therebetween.

Therefore, as shown in the right half of FIG.
Gas is gradually released from the balloon 12 through the line 15,
While deforming the balloon 12, the mesh of the net 30 is passed through and the balloon 12 is raised above the net 30. At this time, as shown in the right half of FIG.
It is hung by the wire 31 from.

Development of Seat Next, the truck equipped with the compressed air supply device 23 is moved to directly below the floating roof unit 11, the line 25 of the seat 20 is connected to the compressed air supply device 23, and the valve 24 is connected.
Is opened and air is supplied into the sheet 20 having an air film structure to spread the sheet 20. In this state, when the floating roof unit 11 is pulled back using the line 15 or the like, the sheet 20 is unfolded and installed on the mesh of the net 30.

Fixing of the floating roof unit After the above operation, if the gas is reinjected into the balloon 12 to expand it, the balloon 12 will move from below the mesh of the net 30 as shown in the right half of FIG. 3 (c). The net 30 is supported so as to be lifted. In this state, the net 30 serves as a skeleton of the temporary roof structure, and at the same time restricts the movement of the balloon 12 in the vertical direction and the horizontal direction, so that the balloon 1 is meshed with the mesh at a predetermined position.
2 and the sheet 20 are arranged.

By injecting a small amount of fluid such as water together with compressed air into the sheet 20 having an air film structure, the adhesion between the balloon 12 and the sheet 20 and between the sheets 20 is secured even in a strong wind. be able to.

Construction of a floating roof By advancing the balloon positions above all of the floating roof units 11, performing a set-up work including unfolding the seat, and fixing the floating roof units, the nets 30 are adjacent to each other on the mesh. The peripheral portions of the seats 20 to be overlapped with each other are overlapped, and the work for constructing the floating roof 10 is completed.

Measures against wind and rain After the floating roof 10 is erected, if a wind having a predetermined strength or more is generated, the form of the floating roof 10 is changed,
The optimum mode can be adopted according to the weather condition.

FIG. 4 shows three kinds of modes showing the morphological change of the floating roof 10. As shown in Table 1, each mode shows the enclosed fluid in the air film structure sheet 20 and the balloon 12. The position is different.

[0030]

[Table 1]

The A mode shows the state of the temporary roof that has been expanded and installed, and is a steady state. The B mode is used for the floating roof unit 11 when the wind is weak or strong in fine weather.
This is a mode for protecting the windshield, and shows a state where the wind is removed. In this B mode, some gas is released from the balloon 12,
By letting the mesh of the net 30 pass through, the wind is escaped from the slight gap generated by the rising roof unit 11 rising.

The C mode indicates a temporary placement on the ground. At the time of a strong wind such as a typhoon, it is necessary to remove the gas from all the balloons 12 and collect it in the gas supply device 13 to lower the floating roof 10 to the ground. A fluid such as water is injected into the seat 20 to cover the core rising surface with the seat 20 and at the same time serve as a weight for placing the floating roof unit 11 on the core rising surface. If it is not raining even in a strong wind, the floating roof unit 11 can be moved to an appropriate place that does not hinder the work, and the rising work can be continued. At this time, a fluid such as water may be injected into the balloon 12 to form a weight.

The application states of the floating roof 10 for each mode depending on the presence or absence of wind and rain on the rising surface of the core are generally as shown in Table 2.

[0034]

[Table 2]

Lifting force acting on the entire floating roof 10 (a force that the wind that enters under the roof 10 tries to lift the roof 10) or drag force (crosswind etc.) is applied to the outer surface of the roof 10 by the sudden wind. (Equal to a lateral load corresponding to the projected area of the net), the wire 33 attached to the peripheral portion of the net 30 is used for connection.

In the construction of the fill dam, as the rising surface rises, the rising surface becomes longer in the dam axial direction (left and right bank direction) and becomes narrower in the upstream and downstream directions.
1 is fastened to a movable heavy equipment 34 such as a dump truck as shown in FIG. 1, the movement of the heavy equipment 34 makes it possible to move the entire floating roof 10 on the raised surface. . Moreover, by appropriately adding the floating roof unit 11, it is possible to cope with such a change in the shape of the raised surface.

According to the above-mentioned embodiment, in the fill-up work of the fill dam, the build-up work during rain or snow can be performed by placing the temporary roof on the build-up surface of the core. Therefore, the number of workable days can be increased more than before, the construction period can be shortened, and the construction cost can be greatly reduced.

The floating roof 10 includes a balloon 12 and a seat 2.
0 and the net 30 are the main components,
The structure is simple, and even in large-scale dam construction, the facility cost is low and it is economically advantageous.

In the method of constructing the floating roof 10, the assembling work is simple and the operation is easy. Therefore, it is easy to adopt it as a site work. Furthermore, the measures against wind are perfect, and the reliability of safety is high.

[0040]

The floating roof according to the present invention is a temporary roof utilizing the buoyancy of a balloon, and is not limited to the fill dam core building work, but is also suitable for outdoor civil engineering and construction work that is easily affected by rain and snow. On the other hand, it enables all-weather construction with a simple structure.

Further, by shortening the construction period, it is possible to expect a ripple effect such as shortening the working hours at the site and improving the work environment at the construction site.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a state where a floating roof of the present invention is installed on a core rising surface of a fill dam.

FIG. 2 is a perspective view of a floating roof unit that constitutes the floating roof.

FIG. 3 is a side view for explaining a procedure for constructing the floating roof.

FIG. 4 is a side view for explaining a change in the form of a floating roof, where A mode is a steady state, B mode is a wind vent state, and C is a side view.
The mode is a temporary placement on the ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Zone type dam 10 Floating roof 11 Floating roof unit 12 Balloon 13 Gas supply device 15 (Helium) gas line 20 (Roof) sheet 30 Net 31 Wire as connecting means 33 Wire as locking means

Claims (3)

[Claims] 1. A roof sheet, a net for supporting the sheet from below, a balloon connected to the net and filled with a gas having a density lower than the atmosphere, and the net on the ground against the buoyancy of the balloon. Floating roof consisting of locking means to connect. 2. The floating roof according to claim 1, wherein the roof sheet has an air film structure. 3. A balloon comprising a roof sheet constituting a floating roof on the top of the balloon, and connecting the net having a mesh smaller than the diameter of the balloon when inflated to levitate the balloon, and then deforming the balloon. The net of the net is moved upward from below, and again, the net is moved in the opposite direction to deploy the roof sheet on the net, and then gas is injected into the balloon to expand the balloon, A method for constructing a floating roof, which consists of supporting the net from below the mesh.