JP2565080Y2 - Tunnel support - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arch-shaped tunnel cultivation support which forms a framework of a tunnel cultivation house.

[0002]

2. Description of the Related Art Generally, a tunnel cultivation house has a plurality of arched curved columns arranged at predetermined intervals, and a cover made of a resin film such as polyvinyl chloride is placed on these columns. It is formed so as to play a role of keeping heat in a plant cultivation, protecting from rain, and the like.

Conventionally, as an arch-shaped support in this tunnel cultivation house, for example, a steel pipe having an outer peripheral surface coated with a synthetic resin layer has been widely used.

[0004]

However, such a conventional support has a smooth synthetic resin layer surface in close contact with a resin film forming a cover of a house. Due to the effect of the plasticizer etc. contained in the resin film migrated to the synthetic resin layer of the pillar,
There is a problem that the resin film is deteriorated and easily broken.
In particular, when the temperature rises during the daytime in summer, plasticizers and the like contained in the resin film tend to precipitate on the film surface, and there is a problem that the resin film is significantly deteriorated and torn from the contact portion.

An object of the present invention is to provide a column for cultivating a tunnel which has solved the conventional problems.

[0006]

In order to solve the above-mentioned problems, the present invention reduces the contact area between the support and the resin film, suppresses the temperature rise by providing the contact portion with air permeability, and removes the plasticizer from the resin film. And so on.

That is, the support for tunnel cultivation of the present invention is as follows:
The outer peripheral surface of the core material is coated with a synthetic resin layer to form a circular section.
Made is, irregularities are provided, et al is a synthetic resin layer surface in contact with the resin film forming the covering of the house, the uneven ridge and groove line
: It is formed alternately disposed, ridges, the grooves have a circular cross section
Are extended in a direction intersecting the length direction of the column.

[0008]

The contact area between the synthetic resin layer of the pillar and the resin film that covers the house is small due to the unevenness, and a gap is formed in the contact portion between the two, so that ventilation is improved, temperature rise in the contact portion is suppressed, and contact is prevented. Transfer of a plasticizer or the like from the resin film in the portion is suppressed, and deterioration and tear of the resin film are prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the drawings, A is a pillar of the present invention, which is curved in an arch shape. As shown in FIG. 1, a plurality of the pillars A are arranged at predetermined intervals, and a resin film 4 such as polyvinyl chloride is covered on the pillars A to form a tunnel cultivation house. . In FIG. 1, reference numeral 5 denotes a connecting string of the column A, and reference numeral 6 denotes a pile for stopping an end of the resin film 4.

As shown in FIG. 2, the pillar A is formed by coating a synthetic resin layer 2 on the outer peripheral surface of a core material 1 and has a circular cross section. As the core material 1, a metal pipe such as a steel pipe having a circular cross section is generally used, but another hollow or solid long body such as a fiber reinforced resin pipe may be used. The synthetic resin layer 2 may be formed of a suitable resin such as polyethylene, polypropylene, polyvinyl chloride and the like. It is preferable that the synthetic resin layer 2 is colored white so that heat absorption by sunlight or the like can be suppressed.

The surface of the synthetic resin layer 2 which is in contact with the resin film 4 which covers the tunnel cultivation house is provided with irregularities 3. The unevenness 3 may be provided only at a portion that contacts the resin film 4 or may be provided over the entire surface of the synthetic resin layer 2. Irregularities 3 in general have the preferred being formed from ridges or grooves Article.

The projections and depressions 3 are formed by alternately providing ridges 31 and grooves 32 as shown in FIGS. 3 and 4, for example.
1, the grooves 32 are Ninasa to extend in a direction intersecting obliquely to the longitudinal direction of the circular cross section of the column A, the grooves 32 does not become sealed shape when in contact with the resin film 4, the grooves 32 can be secured as a ventilation path, and a rise in temperature at the contact portion can be suppressed, which is preferable.

[0013]

The ridges 31 and grooves 32 forming the irregularities 3 may be continuous or discontinuous along the length of the column A. In addition, the ridge 31 and the groove 32 may extend in the circumferential direction of the column A.

[0015]

As described in detail above, the pillar for tunnel cultivation of the present invention has a circular cross section and has irregularities on the surface of the synthetic resin layer which comes into contact with the resin film forming the house. The contact area between the surface and the resin film can be reduced, the synthetic resin layer and the resin film do not adhere to each other as in the related art, and a gap can be formed in the contact portion to provide air permeability and suppress a rise in temperature. Therefore, migration of the plasticizer and the like from the resin film at the contact portion can be suppressed, and deterioration and tear of the resin film can be prevented.

Also, the projections and grooves are formed by alternately providing projections and grooves, and the projections and grooves extend in a direction intersecting the length direction of the column having a circular cross section. ,
Combined with the fact that the cross section of the column is circular, the groove at the contact portion between the synthetic resin layer and the resin film does not become a closed shape, the air permeability can be kept in a good state, and the above effect is more reliable. I can do it.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a tunnel cultivation house using a support of the present invention.

FIG. 2 is a cross-sectional view showing a contact portion between the support of the present invention and a resin film.

FIG. 3 is a partially cutaway perspective view showing an embodiment of the support of the present invention.

FIG. 4 is a partially cutaway perspective view showing another embodiment of the support of the present invention.

[Explanation of symbols]

 A props of the present invention 1 core material 2 synthetic resin layer 3 irregularities 31 ridges 32 grooves 4 resin film

Claims (1)

(57) [Scope of request for utility model registration] 1. An arch-shaped support forming a skeleton of a tunnel cultivation house, wherein a synthetic resin layer is formed on an outer peripheral surface of a core material to form a circular cross-section, and the synthetic resin comes into contact with a resin film forming a cover of the house. Unevenness is provided on the layer surface
The unevenness is formed by alternately providing ridges and grooves.
Ridges and grooves intersect with the length
Tunnel cultivation support extending in the opposite direction
Pillar.