FI86097B - Field construction for sports ground or other field - Google Patents

Abstract

The invention relates to a field construction for sports field or other field, comprising a planted or other surface layer and filtration layer beneath the former, and provided with a piping system 2, 3, located in the filtration layer, comprising a plurality of perforated pipes 3 for drying the field and for ducting air through the field. According to the invention the proportion of fine sand material with a grain size of less than 0.6 mm is less than 5%, and most advantageously less than 1% in the filtration layer, making it highly air-permeable, and the surface layer comprises a sufficiently large quantity of the fine material to make it significantly less air- permeable. <IMAGE>

Description

86097

FIELD STRUCTURE FOR SPORTS OR OTHER FIELDS

The invention relates to a field structure for a sports or other field, comprising a growth or other surface layer and a filter layer below it, provided with a piping placed in the filter layer, comprising a plurality of torn multifunctional tubes for drying the field and passing air through the field.

10 In the drainage networks built on the green areas of the sports grounds, the distance between the drains has varied from 8 to 10 meters. Uneven drying is currently observed in several fields. For the pipelines, the field is considerably drier 2-4 m wide than in the middle of the pipelines.

15

Fields with different pipelines are described in German application and patent publications DE-P-924931, DE-H-2 059 383, DE-H-27 38 133 and DE-H-28 40 389. The field 20 that is dried by flowing excess water into drains. In these, the field is heated by blowing heated air into the piping, through which it passes to the surface of the field from below. The problem with the above-mentioned field structures is, firstly, the unevenness of the blow unless the piping is very dense. On the other hand, the reciprocating flow causes the ingress of fine soil in known field pipes.

It is also known to use electric resistors or heat pipes on the surface of a sports field to heat and dry the surface of the field. The distance between the resistors or pipes has been only 20 cm, which has resulted in a huge total length of resistance cables and heating pipes.

The object of the present invention is to provide a new field structure which enables the efficient use of the piping for both drying and irrigation and which helps to cope with a smaller number of pipelines than before. The main features of the invention appear from the appended claim 1. According to the invention, the piping is placed in a special filter layer in which the proportion of fine soil 40 is small, whereby the flow of heating air 2 86097 in that horizontal direction is also possible. In this case, the piping does not have to be unreasonably dense.

Most preferably, the field structure according to the invention is suitable for a field with a growth-5 substrate according to claim 3. The surface layer is adapted to be poorly air permeable on a case-by-case basis. Depending on the type of soil, the fines content can vary greatly.

In the following, the invention will be illustrated by way of example with reference to the accompanying figures, which show an embodiment of the invention in connection with a grass field of about 8000 m * for ordinary sports use.

15 Figure 1 shows the placement of the piping in the field

Figure 2 shows the field structure in ground section

Figure 3 shows a multifunction tube

Figure 4 shows another preferred piping structure 20. The entire piping is located below ground level. On the sides of the field, there are trunk pipes 1, to which are connected the distribution pipes 2 extending to the center of the field. To these are further connected the actual .., multi-purpose pipes 3, which act as both drainage pipes and air distribution and irrigation pipes in the other direction.

"•• 25

Kenttänurmi's growing medium is quite conventional. However, it clearly forms a separate layer 5 from the filter layer 4.

• In addition, a fine material has been selected for the medium layer 5; much that it exhibits a strong capillary with which the roots of 30 plants receive water from the filter layer 4. Both layers 4 and 5 are about 20 cm thick.

. A separate damper layer can also be used under the grass, with which the surface hardness can be adjusted to the desired case. 35 The piping 2,3 is installed in the filter layer 4, where the proportion of fines is very small. Blowing air and with it -: ··. both heat and moisture can then also be transported horizontally, so that the multifunction pipes 3 can be placed at a reasonable distance of 3 to 86097 m from each other. For this reason, a multi-functional pipe is not required for a normal-sized sports field other than 3,000 - 4,000 m, when the previously mentioned need for electric heating resistor or liquid circulation piping would be about 30,000 m.

5

The multi-purpose pipes 3 are preferably made of a conventional torn drain pipe on which a plastic filter wire 7 is mounted. This prevents fines from entering the pipe and thus clogging it, Fig. 3.

10

Irrigation can be performed in connection with such a field structure as either spray irrigation or dam irrigation. Spraying is performed during blowing, while in dam irrigation, the piping is filled directly with water.

15

The field structure according to the invention is intended for use throughout the growing season. In summer, it allows the field to both irrigate and drain excess water into drains. For example, in known electrically heated fields, heating is used only in spring and autumn.

Based on practical experiments, the pipeline has been further developed and a structure according to Figure 4 has been reached. Medium-size field of this pipe is divided into four blocks, and Kum-25 Mankin side of the two blocks used in the field on both sides of the machinery arranged 8. These flow is controlled by the edge of the field located in the January 9 by the main frame tubes. If necessary, these can be used to control the entire power to one block. Blowing can, of course, only be carried out with 30 single blowing machines.

From the body pipe 1 with a diameter of 400 mm, 160 mm manifolds 2 branch under the field and a large number of 50 mm multifunction pipes 3 intersect. Such a network structure together with a highly air permeable filter layer 4 offers several advantages. The network structure increases operational reliability and enables the diameter of the multi-purpose pipes to be reduced by half compared to the branch structure.

4,86097

It is particularly essential that the surface layer causes the greatest air resistance. As a result, heating, drying or irrigation is made even over the entire block. It can be recommended that the air permeability of the 5 filter layers should be 3-4 times as high as that of the surface layer.

Claims (6)

A sports field or other field structure comprising a plant or other surface layer and under it a filter layer and which field is provided within a pipe system (2, 3) located in the filter layer, which comprises numerous perforated multifunctional tubes (3) for drying field and for passing air through the field, characterized in that in the filter layer (4), the proportion of fine rock material, grain size below 0.06 mm, is below 5%, most preferably below 1%, whereby it permits air and the surface layer contains very fine material that it is significantly more permeable to air. Field construction according to claim 1, characterized in that the multifunctional tubes (3) consist of perimeter cover tubes (6) known per se, which are covered with wire weave (7). Field construction according to claim 1 or 2 for plant substrates, characterized in that the plant substrate consists of a special layer (5) on top of the filter layer (4), and that the proportion of fine material, grain size below 0.06 mm, of the plant substrate mass is more than 15% . Field construction according to claims 1, 2 or 3, characterized in that the thickness of the filter layer (4) is 15 - 25 cm and the thickness of the surface layer 15 - 25 cm. Field design according to any of claims 1 -. 4, characterized in that the pipe system located in the filter layer (4) consists of a network of distribution and quantity function pipes (2, 3), where each quantity function pipe (3) is intersected with several different distribution pipes (2). Field construction according to any one of claims 1 to 5, characterized in that the soil species in the surface layer and the filter layer are so adapted that the specific air permeability of the filter layer is at least 2.5 times as large as that of the surface layer.