JPH0886127A - Method of laying shock absorbable fence for sports stadium, base ball ground or the like - Google Patents

Abstract

PURPOSE: To enhance the working efficiency by spraying a high viscous mixtures in which a main agent and a hardener are mixed, onto the surface of a damper layer made of a foamed material in a low pressure condition, so as to prevent a liquid material from trickling down or scattering, thereby it is possible to prevent the material from being wasted. CONSTITUTION: A foamed material damper member 2 is secured to the outer surface of a concrete wall 1 or the like, with the use of an adhesive or the like, and further, a rapid curable resin 6 such as polyurethane elastomer or the like, is sprayed onto the outer surface of the damper member 2 at a discharge pressure of 5 to 7kgf/cm<2> by a spraying device 7. Further, the liquid material is prevented from trickling and scattering so as to prevent the material from being wasted. With this arrangement, the appearance of the fence becomes satisfactory, and the workability of laying the fence can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a shock absorbing fence in a stadium, a baseball field, etc., and more specifically, it can improve construction workability and appearance and improve shock resistance. The present invention relates to a method of constructing a shock absorbing fence that can be used.

[0002]

2. Description of the Related Art In recent years, safety fences of baseball fields, athletic fields, other stadiums, and indoor gymnasiums have a cushioning function so as not to be injured when a competitor collides with the fence. Things have been proposed. For example, JP-A-4
As shown in FIGS. 2-22781, JP-A-3-212540 and FIGS. 2 and 3 of the accompanying drawings, a cushion material 2 made of foam material or sponge rubber is attached to a wall surface 1a of a fence 1 made of concrete or the like, Then, a cover sheet 3 made of a rubber sheet with a reinforcing layer and having a thickness of about 3 mm is attached so as to cover the cushion material 2, and the upper and lower end portions thereof are attached to the wall surface 1a of the fence 1 by fastening members 4 such as pressing plates and bolts. The structure is fixed to the upper wall surface 1b.

However, in the conventional work of attaching the cushioning material as described above, the cover sheet 3 is adhered to and supported by the side surface of the cushion material 2 via an adhesive material or the like, and the upper and lower end portions of the cover sheet 3 are fastened. Since it was fixed to the wall surface 1a of the fence 1 by means of 4, it requires a lot of labor and time for supporting the cover sheet 3 and fixing the terminal portion, and since the cover sheet 3 having a constant width is used, Not only does the appearance of seams impair the appearance, but the height of the fence 1 becomes high, and if the fence 1 is used for a long period of time, the cover sheet 3 loosens due to its own weight, and the shock absorbing performance is reduced. There was a problem of damaging.

Therefore, in order to improve the appearance of the cover sheet 3 and the impact and shock absorbing performance,
Instead of the cover sheet 3, there has been proposed a method of attaching a shock absorbing material on a wall surface in a stadium or the like, in which a raw material solution of urethane elastomer is sprayed on the surface of the cushion material 2 using a spraying device or the like (Japanese Patent Laid-Open No. 4-79969). Issue)
.

In addition to the above, in order to reinforce the surface of the foamed molded product, a room temperature curable high-reaction polyurethane stock solution is applied to the outer surface of the foamed synthetic resin molded product by a high pressure spraying device for 30 to 2
A method of spraying at a discharge pressure of 10 kg / cm ² has also been proposed (JP-A-3-67107).

[0006]

[Problems to be Solved by the Invention] By the way, when spraying a stock solution of urethane elastomer onto a cushion material attached to a substantially vertical wall surface such as a fence in a stadium or the like, there is a constant problem. It is necessary to spray at a predetermined discharge pressure so as to have a wall thickness, and to have a viscosity such that the sprayed stock solution does not drip before curing.

However, the spraying device used in the conventional spraying method uses a so-called collision-mixing spraying device in which the main agent and the curing agent are collided and mixed at the tip of the nozzle, so that the spraying is sufficient even in a large area. Although it is possible to spray with a fine mist, and has the advantage that the physical properties and finish are good, on the other hand, the stock solution is largely scattered at the time of spraying, and it is possible to spray with a low viscosity stock solution at a high discharge pressure. Conditions were needed.

Therefore, when the urethane elastomer stock solution is sprayed on the cushion material attached to the substantially vertical wall surface by using the conventional spraying apparatus as described above, the sprayed stock solution has a low viscosity. There is a problem that it is difficult to apply a predetermined amount of flesh to the front and spoil the appearance, and in addition, the stock solution is largely scattered at the time of spraying and the stock solution is wasted.

The present invention was devised in view of the above-mentioned conventional problems, in which a base material and a curing agent are mixed in a foam cushioning material layer attached on the surface of a concrete wall in a nozzle portion of a spraying means. Since the surface layer is formed by spraying the high-viscosity mixture in the state of low pressure, the sprayed stock solution does not drip before curing, and it can be applied to a predetermined flesh and the appearance can be improved. It is an object of the present invention to provide a method for constructing a shock absorbing fence at a stadium, a baseball field, etc., which can be done and does not scatter the undiluted solution at the time of spraying and can prevent waste of the undiluted solution.

[0010]

In order to achieve the above-mentioned object, the present invention has a foaming buffer material layer mounted on the surface of a concrete wall, and then mixed with a main agent and a hardening agent by a spraying means. The gist is to spray the viscous mixture at a low pressure to form the surface layer. The high-viscosity mixture is made of a quick-curing resin, and the discharge pressure of the spraying means is 5 Kgf / cm ^{2 to} 7 Kgf / cm ² .

[0011]

The present invention is configured as described above, and after the foam cushioning material layer is attached on the surface of the concrete wall, the main agent is preliminarily set on the surface of the foam cushioning material layer in the blowing nozzle portion. And a curing agent are mixed to form a high-viscosity mixture, and the high-viscosity mixture is sprayed at a low pressure by a so-called static mixing type spraying device to form a surface layer, so that the sprayed stock solution is cured before curing. It can be applied to a predetermined thickness without sagging, the physical properties of the coating can be improved, the appearance of the applied product can be improved, and there is no dispersion of the stock solution at the time of spraying. It can be prevented.

As the static mixing type spraying means, for example, a well-known jet spray machine device (machine with a German type computer control device) used in a super high speed curing urethane spraying method is used. The spray machine is a complete adhesion coating spray system using ultra-fast curing type polyurethane elastomer. By controlling the discharge amount, discharge pressure, compounding ratio, etc. by computer control, the film thickness from at least about 2 mm It can be arbitrarily selected and sprayed.

Further, as one of the features of this jet spray machine apparatus, due to the spraying work of a dedicated jet spray machine, a suitable vapor diffusivity is produced in the coating film, and the swelling of the coating film due to the vapor pressure in concrete occurs. Without
It is breathable and enables complete close contact construction.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a schematic configuration diagram for carrying out a method of constructing a shock absorbing fence according to the present invention, in which 1 is a fence made of concrete or the like,
Reference numeral 2 denotes a foam cushioning material layer made of foaming material, sponge rubber, or the like attached to the wall surface 1a of the fence 1 with an adhesive 5, and 6 denotes a spraying means 7 on the surface of the foaming cushioning material layer 2.
1 shows a surface layer made of a high-viscosity mixture in which a main agent and a curing agent are mixed via a resin.

In the embodiment of the present invention, as the spraying means 7, a constant condition, which is a necessary condition for spraying a high-viscosity mixture onto the foam cushioning material layer 2 attached to a substantially vertical wall surface, is fixed. A static mixing type spraying device is used which is sprayed at a predetermined discharge pressure so as to have a wall thickness of 2, and which can use a material having such a viscosity that the sprayed high-viscosity mixture does not drip before curing.

That is, as the static mixing type spraying device, for example, a well-known jet spray machine device used in the ultra-high speed curing urethane spraying method is used.
It is a perfect adhesion coating spray system using ultra-fast curing type polyurethane elastomer. By controlling the discharge amount, discharge pressure, compounding ratio, etc. by computer control, the film thickness can be arbitrarily selected from at least about 2 mm. It can be sprayed.

When spraying a high-viscosity mixture obtained by mixing the main component and the curing agent using the static mixing type spraying means 7 as described above, the wall surface 1a of the fence 1 made of concrete or the like is made of foam. After the cushioning material layer 2 is attached, the surface of the foam cushioning material layer 2 is sprayed at a low pressure with a high-viscosity mixture that has been mixed in the blowing nozzle portion in advance to form the surface layer 5. There is no need to say that the undiluted solution of the mixture drips before curing, it can be applied to the prescribed flesh, the physical properties of the coating film are also good, the appearance that was applied can be improved, and the undiluted solution when sprayed Therefore, it is possible to prevent waste of the stock solution.

Next, the static mixing type spraying device used in this embodiment, that is, the case where the spraying machine was used for the construction, and the sprayer manufactured by Gasmer Co., USA, which was used as the conventional high pressure spraying device, were used. The test conditions, test methods, comparative examples, and the test results when used for construction will be described below. In addition, as a difference between the jet spray machine device and the spray machine made by Gasmer of the United States, the jet spray machine device is
The main agent and the curing agent are mixed and mixed in the nozzle,
By changing the rotation speed of the gear using a gear pump, the compounding ratio is changed, and the mixture is pumped and ejected. Therefore, even a highly viscous material can be pressure-fed, and since it is an air spray of the static mixing system, even a material having a slightly high viscosity can be sprayed.

On the other hand, a sprayer manufactured by Gasmer Co., Ltd. in the United States uses a cylinder pump to pressure-feed the material, and it is difficult to constantly feed the same amount of the main agent and the curing agent, and the gas is ejected from the nozzle. This is a method in which the base material and the curing agent are sometimes collided and mixed, and the discharge pressure is increased. Therefore, in the jet spray machine, the same amount of the main agent and the curing agent can be constantly sent out, and the mixing ratio of the main agent and the curing agent can be easily changed and pressure-fed, which affects the physical properties of the coating film. Is less. (1) Test conditions . Trial material All-weather sports ground pavement material, Product name: "Yokohama Rubber Co., Ltd. Surfam U-3000"
To use.

Component A: diphenylmethane diisocyanate (MDI) type (main agent) prepolymer 80% dioctyl phthalate (DOD) 20% NCO% = 12% Toner (yellow iron oxide, etc.) 4% OH value = 155 mg KOH / g A / B = 1/1. Coating method <coating method I> conventional methods sprayer: H-2000 (Gasuma Co.) Spray gun: Purobura (Glass Kraft) ejection out pressure: 80 kgf / cm ² A component, B component also warmed up 60 ° C. Used from.

<Coating method II> Method of the present invention Sprayer: G-41 / 2D (Unipre Co.) Spray gun: GSP20 Discharge pressure: 5 kgf / cm ^{2 After} heating both A and B components to 40 ° C. used. (2) Test Method and Results (a). Moisture Permeability According to JIS Z 0208 The test material "Surfam U-3000" was applied by Application Methods I and II to prepare a test piece having a film thickness of 2 mm.

500 g of anhydrous calcium chloride was placed in a glass container (200 × 100 × 200 mm), the test body was set on the container, and the periphery thereof was sealed with gum tape and paraffin. This container was put in a thermostatic chamber at 25 ° C and 90% RH, the weight change of the glass container was measured, and the moisture permeability and the moisture permeability coefficient were determined by the following formulas. Moisture vapor transmission rate (g / m ² · 24h) = (240 · m) / (t · s) where s: moisture vapor transmission area (cm ² ) t: total time of the last two weighing intervals at which the test was conducted (H) m: sum of increased masses in the last two weighing intervals tested (mg) Saturated water vapor pressure at 25 ℃: 23.758mmHg Water vapor pressure difference: 23.758 (0.9-0) = 21.3822mmHg (test result of moisture permeability)

[0023] As is clear from the above results, in the case of the coating method II of the present invention, the moisture permeability is about twice or more better than that of the conventional coating method I, and the durability of the surface layer is improved. At the same time, it was found that problems such as swelling could be eliminated. (B). Adhesiveness 1) A JIS walking board was coated with 200 g / m ² of urethane primer (MDI prepolymer / ethyl acetate = 40/60) with a brush.

2) After 6 hours and 24 hours, "Surfam U
-3000 "was applied by the above coating methods I and II so that the film thickness was 2 mm. 3) After curing for 1 week, the adhesive strength was measured with a Kenken tensile tester. (Adhesion test results)

[0025] As is clear from the above test results, the conventional coating method I
It was found that the adhesive strength in the coating method II of the present invention is higher than that of No. (C). Fillability 1) A rubber chip layer was prepared with the following composition.

[0026] 2) After curing for 1 week at room temperature, apply "Surfam U-3000" by applying methods I and II until the rubber chip layer is filled. 3) Measure the applied amount. (Test results for fillability)

[0027]

As is clear from the above test results, when the coating method II of the present invention is formed to have the same thickness as compared with the conventional coating method I, The coating amount is small, the coating work is easy, and the material can be saved. (D). Comparison of cured physical properties.

Applying "Surfam U-3000" I, II
The sample that was cured at 25 ° C for 1 week was applied as
The density, hardness, modulus, tensile strength, elongation and tear strength were compared. The test method is JIS K
6350 and JIS K 6301.

[0030] As described above, when the buffer fence is constructed by using the spraying means of the present invention and the conventional spraying means, and the moisture permeability at that time, the adhesiveness, the plugging property, and the cured physical properties are compared, it can be seen that the conventional coating is applied. It was found that the coating method of the present invention was superior to the method and was suitable for construction of a buffer fence.

[0031]

As described above, according to the present invention, a foamed cushioning material layer is attached on the surface of a concrete wall as described above, and then a high-viscosity mixture obtained by mixing a main agent and a curing agent by spraying means is applied under low pressure. Since the surface layer is formed by spraying, the sprayed stock solution does not sag before curing, and it can be easily applied to the desired flesh and the appearance can be improved, and the stock solution is sprayed during spraying. There is no effect, and there is an effect that the waste of the stock solution can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram for carrying out a method of constructing a shock absorbing fence according to the present invention.

FIG. 2 is a cross-sectional view of a conventional shock absorbing fence.

FIG. 3 is a cross-sectional view of another conventional shock-absorbing fence.

[Explanation of symbols]

1 Fence 1a Fence wall surface 2 Foam cushioning layer 5 Adhesive 6 Surface layer 7 Spraying means

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B32B 13/12 25/04 E04B 1/98 W (72) Inventor Masato Kokusei No. 2 Oiwake, Hiratsuka City, Kanagawa Prefecture Yokohama Rubber Co., Ltd. Hiratsuka Plant (72) Inventor Toshiyuki Takahashi 1-9-15 Kaigan, Minato-ku, Tokyo Yokohama Rubber Industrial Products Tokyo Sales Co., Ltd. (72) Inventor Nobuyuki Hashimoto Honan, Suginami-ku, Tokyo 1- 47-9

Claims (3)

[Claims] 1. Construction of a shock absorbing fence at a stadium, a baseball field, etc., in which a foam cushioning material layer is attached on the surface of a concrete wall, and a surface layer is provided so as to cover the surface of the foam cushioning material layer. In the method, after a foam cushioning material layer is attached on the surface of the concrete wall, a high-viscosity mixture obtained by mixing a main agent and a curing agent by a spraying means is sprayed at a low pressure to form a surface layer. How to build shock absorbing fences for stadiums, baseball fields, etc. 2. The method for constructing a shock absorbing fence in a stadium, a baseball field, etc. according to claim 1, wherein the high-viscosity mixture is made of a quick-curing resin. 3. The discharge pressure by the spraying means is 5 kg.
The method for constructing a shock absorbing fence at a stadium, a baseball field or the like according to claim 1 or ² , wherein the method is f / cm ^{2 to} 7 kgf / cm ² .