JPH031930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover structure consisting of a skeletal structure covered with a flexible plastic sheet under tension.

In horticulture, the use of hotbed covers consisting of a metal support frame covered with a plastic sheet is known. However, the plastic sheets must be fixed individually, making assembly of this hotbed cover quite troublesome. Furthermore, their shapes are strictly determined by the shape of the support frame, so their range of use is considerably limited. Moreover, since the plastic sheets are only supported on widely spaced support frames, these isothermal floor coverings are not particularly durable; for example, during snowfall or slightly heavy rain, the plastic sheeting The sheet may bend and even break from there.

When constructing dams or similar water-stop structures, it is also known to cover the slopes of the dam core with a simple sheet of plastic as a sealing layer. Plastic sheets are usually supplied in rolls and used in embankments in the form of continuous overlapping webs. A cover layer is then added over the sheet to protect it and hold it on the embankment. However, this method has the disadvantage that the sheet may slip due to the slope of the embankment or the action of the wind. Another drawback is the fact that the sheet is easily damaged by stones contained in the core or the covering layer, which prevents it from performing its function as a sealing layer. It is an object of the invention to provide a cover structure which is universally suitable for use in any desired shape, while being more durable and easier to handle than known cover structures.

To achieve this object, the cover structure of the present invention has two sets of rod-like members, each set of rod-like members being substantially parallel to each other and spaced apart, and substantially intersecting with respect to the other set of rod-like members. A rigid lattice structure covers each side of the lattice structure, is closely attached to the lattice structure, and cooperates to substantially surround the lattice structure, shrinks, and expands the outer structure. and a pair of shrinkable plastic sheets that create edge tension between the rods and are flatly joined to each other through openings in the rods of the lattice structure.

The cover structure of the present invention, in which shrinkable plastic sheets are applied to both sides of the lattice structure, allows the cover structure to be bent into any desired shape. In addition, since pairs of shrinkable plastic sheets are bonded to each other through the openings of the lattice structure, a pretension force is applied to the lattice structure, and therefore the lattice structure has a high resistance to deformation against external forces. , excellent durability. and,
The plastic sheets, which are attached to each other and under tension, will not peel off under the influence of wind and snow, nor will they sag and break therefrom.

Since the net structure covering at least the openings of the lattice structure is interposed between the lattice structure and the flexible plastic sheet, durability is further improved. The mesh structure is effective in reinforcing the plastic sheet so that the cover structure is less likely to be punctured.

The grid mesh of a grid structure consisting of widely spaced criss-crossing bendable metal rods can be made larger or smaller depending on the static forces to be absorbed.

Plastic sheets shrink-fitted on both sides of the lattice structure provide very good protection against corrosion and thus contribute to increasing the durability of the cover structure.

The joining of the two sheets by the welds in the openings of the lattice structure improves adhesion and allows the cover structure to be cut according to individual needs.

Although the lattice structure is bendable, its sufficient inherent stiffness allows the cover structure to be used as a free-standing roof structure.

The construction of the cover structure in a flat form as a roof structure resting on support members provides a simple and inexpensive roof structure which can cover fairly large spans without additional support.

When constructing water-stop structures, the use of a flat-shaped cover structure as a sealing layer reliably prevents the sealing layer from slipping, and the reinforcement contained in the combined material ensures safety against damage to the sealing layer. It will definitely improve the quality and make construction easier, which will lower labor costs.

By using a continuous web-like cover structure, labor and costs can be further reduced.

The present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, a tunnel-shaped cover structure is constituted by a lattice structure 1 and a flexible plastic sheet 2 which is contracted and brought into close contact with the lattice structure 1. A lattice structure 1 is formed by intersecting bendable metal bars. Plastic sheet 2 is a commercially available translucent shrinkable sheet.

The lattice structure 1 is bent into a desired shape, and then the plastic sheet 2 is heat-shrinked tightly onto the lattice structure. Alternatively, the plastic sheet 2 may be shrink-fitted onto a flat-shaped lattice structure, and then the completed cover structure may be bent into a predetermined shape.

FIG. 2 shows the same tunnel-shaped cover structure. The grid structure 1 and in this case the two plastic sheets 2a, 2b also constitute a cover structure. A mesh structure 3 is interposed between the grid structure 1 and the upper plastic sheet 2a which is exposed to the atmosphere. The mesh structure 3 has a much smaller mesh than the lattice structure. The sheets 2a, 2b are welded and shrunk to each other along the edge 4, and the sheets are welded and shrunk to each other over the entire surface between the openings of the lattice structure and the net structure, respectively. As a result, the grid structure 1 and the mesh structure 3 are hermetically sealed between the sheets. The dimensions of the sheets 2a, 2b and the welded seams 4 are selected in such a way that the bar ends 5 of the grid structure 1 project beyond the sheets 2a, 2b and the mesh structure 3 at the longitudinal edges of the cover structure. good. The protruding rod end 5 allows the cover structure to be fixed to the ground in a simple manner.

FIG. 3 shows an embodiment of a cover structure with a relatively rigid lattice structure 1 bent at an angle. The walls of the cover structure are formed by two parts 1a and 1b of the lattice structure 1. Both grid structures 1a, 1b are covered with a continuous web of mesh structure 3 and sealed between the two sheets 2a, 2b. The connection between the two lattice structure parts 1a and 1b is also carried out exclusively by means of a mesh structure 3, which can be bent more easily than the lattice structure 1, and the two sheets 2a, 2b. In this way, the predetermined fold line 7
The roof structure can be built in the form of a roof with ridges at any predetermined angle.

FIG. 4 shows a cover structure in the form of a flat panel. This structure has a grid structure 1, a mesh structure 3 and two plastic sheets 2a, 2b and corresponds to the structure shown in FIGS. 2 and 3.

FIG. 5 shows a cross-sectional view along the line - in FIG. In this figure, the sheets 2a and 2b are welded to each other at the openings of the structural structure 1 and the net structure 3,
It can be seen that the structural structure 1 and the net structure 3 are surrounded and sealed between the sheets 2a and 2b.

Figure 6 is a cross-sectional view of the water stop dam. The dam may be a breakwater, a river dam, or the shore of an artificial lake, and shall be constructed of a core 9 of soil or clay or gravel, and its height above the ground surface 8 must be higher than the expected highest water level. A slope 11 of the core 9 facing the water is covered with a sealing layer 12. The sealing layer 12 consists of a cover structure corresponding to one of the embodiments described above. This cover structure is placed on the slope 11 in the form of large rectangular panels or in the form of a continuous web. A soil or similar covering layer 13 is then spread over the sealing layer 12, and the weight and strength of the covering layer prevents the sealing layer from slipping or being damaged.

Another example of the various uses of a flat cover structure is shown in FIG. Groove 15
A cover structure of the type shown in FIG. 4 is used as the roof covering. One side of the roof 14 is placed on the ground surrounding the groove 15. Place the other side of the roof on top of the support member 17. The support member 17 itself can also be formed from a thin strip of cover structure. If desired, the roof 14 may be covered with soil and/or snow.

A plastic sheet 2 can be spread and secured to a preformed structural structure 1 to form the cover structure shown in FIG. The fixing step may be by shrink sealing and/or adhesion, or may be performed by welding or using a mechanical fastener such as a staple or staple.

The cover structure shown in FIGS. 2 to 7 preferably consists of spreading the sheet 2 on a conveyor belt, followed by a single grid structure or two parallel grid structure sections 1a, 1b. , on which the net structure 3 and finally the sheet 2a are placed. Preferably, the materials mentioned above are fed in a continuous manner, such as unwinding from a feed roll. A conveyor belt passes the stacked web material through a shrink welder. The plastic sheet is heated in this device to soften it and compressed in a suitable device. As a result, the plastic sheet has longitudinal edges and
The net structure and the opening of the lattice structure are welded to each other and simultaneously contracted and brought into close contact. The resulting continuous web is wound onto a roll, cut to any desired size, and bent into the desired shape.

A lattice structure 1 is formed from ribbons or rods that are crossed or knitted at a desired angle. Lattice structure 1
The cross-sectional shape of the ribbon or rod is selected to match the desired static strength as well as the size of the mesh. Suitable materials are primarily structural steel, aluminum or alloys thereof. In the embodiments shown in FIGS. 3 to 7, it is also possible to use a plastic grid produced by injection molding.

The plastic sheet 2 is a conventional shrinkable sheet of the commercially available type having various thicknesses and transparencies to suit the particular application.

The mesh structure 3 may be a web of various metals or plastics of arbitrary shape. The lattice structure 1 is effective in supporting the mesh structure 3 so that significant tensile or compressive forces are not applied to the plastic sheet during shrinkage or use. The thickness of the net structure 3 is the expected bending force,
It is simply determined by the lateral loads to be absorbed during use and the desired transparency.

The invention is not limited to the embodiments described and illustrated. A feature of this embodiment is that they can be easily replaced. It is therefore also possible to provide the tent or gable roof of FIG. 3 with a projecting rod end 5. It is also possible to vary the bent shape of the cover structure.
By constructing the embodiment shown in FIG. 3 with three lattice structure sections so as to form two predetermined fold lines, the cover structure can be assembled into a channel-shaped cross-sectional shape. If appropriately sized, an igloo-style shelter can be built with a tunnel-shaped cover structure. This is because the shed is able to adequately support the weight of the soil and/or snow piled on top of it as a covering layer.

The flat shaped cover structure can be used as a portable temporary shelter for research or similar trips.

The cover structure shown in Figure 6 is suitable for use not only in sealing banks, but also in sealing the bottom of canals.

Other potential uses include agricultural chemicals and the construction industry. For example, it can be used to temporarily seal the lining of an underground silo or the opening of a door or window in a building under construction.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an embodiment of the cover structure of the present invention, and FIG. 2 is a tunnel-shaped cover structure of the present invention formed by two plastic sheets and a mesh structure inserted between them. FIG. 3 is an explanatory diagram showing the cover structure of the present invention having a predetermined fold line, FIG. 4 is a perspective view of the cover structure of the present invention having a flat shape, and FIG. FIG. 4 is a sectional view taken along line - in FIG. 4, FIG. 6 is a cross-sectional view of the water stop dam, and FIG. 7 is an explanatory view showing the cover structure of the present invention placed on a support member. 1... Lattice structure, 1a, 1b... Lattice structure part,
2, 2a, 2b...plastic sheet, 3...net structure, 4...edge (or welded seam), 5...rod end,
7... Fold line, 9... Core, 11... Slope, 12... Seal layer, 14... Roof, 15... Groove.

Claims (1)

[Scope of Claims] 1A A substantially rigid lattice structure having two sets of bar-like members, each set of bar-like members being spaced apart from each other substantially parallel to each other, and crossing each other with respect to the other set of bar-like members. and (B) covering one side of each of the lattice structures and being in close contact with the lattice structures, (1) cooperating to substantially surround the lattice structures, and (2) contracting to form the lattice structures. and (3) a pair of retractable plastic sheets that are joined flatly to each other through openings in the bars of the lattice structure. cover structure. 2. The cover structure according to claim 1, wherein the net structure is flatly inserted between the lattice structure and one of the shrinkable plastic sheets, and is surrounded by the pair of said plastic sheets together with the lattice structure. , a cover structure in which plastic sheets are bonded flat through their openings. 3. The cover structure of claim 2, wherein the lattice structure comprises bendable metal bars spaced a distance apart, the mesh structure being substantially thinner than the metal bars of the lattice structure and spaced less than said distance. A cover structure comprising striations. 4. A cover structure according to claim 1, wherein the cover structure is curved as a free-standing roof structure. 5. In the cover structure according to claim 1, the roof structure 1 is attached to the support member 17.
4 is a cover structure with a flat shape. 6. The cover structure according to claim 1, which has a flat shape as a sealing layer of a water-stop structure. 7. The cover structure of claim 6, wherein the cover structure is a continuous web.