JP3445172B2 - Fuel non-diffusion pavement structure at gas station - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel non-diffusion pavement structure for a gas station, and more particularly to a fuel non-diffusion pavement structure for a gas station such as a gas station. [0002] Conventionally, strict regulations have been imposed on the use of premises of gas stations and other gas stations and the installation of various facilities. For example, a general floor slab of a refueling open space is required to be paved with concrete or the like, to be higher than the surrounding ground surface, and to have a predetermined gradient facing the surroundings. At the same time, a gutter is provided at the lower end of the slope around the site to collect oil and drain rainwater when flammable liquids such as gasoline, light oil, kerosene, etc. (hereinafter collectively referred to as fuel) leak. . [0003] Also, with the amendment of the Fire Services Act of 1988,
It is now possible to build a gas station on the first floor of a building with an upper floor. One of the conditions in this case is the installation of a leak localization facility. As a leak localization facility, for example, when injecting fuel from a tank lorry into an underground tank, if there is excess injection and overflow, a recovery area of 15 m ² or more for preventing fuel diffusion and a leaked fuel The provision of an oil collecting tank of 4 m ³ or more to accommodate is specified. The underground tank must also be equipped with a device that automatically prevents overflow due to excessive injection, ensuring safety. [0004] By the way, recently, following the deregulation, a self-service type gas station in which a driver himself refuels has been opened. For this reason, there is a possibility that a driver who is not accustomed to refueling work may increase the possibility of a fuel leakage accident or an excessive injection accident near the weighing machine. Conventionally, a fixed amount (60 to 18 depending on the setting) is used for a metering machine for refueling at a gas station.
(Variable to 0 liters) is provided with a leakage prevention device that stops discharge when fuel leaks. However, when these maximum discharge amounts of fuel flow out onto the pavement surface of the refueling space, the fuel spreads over a considerably large area due to the gradient applied to the pavement surface. If the spread fuel is ignited before volatilizing, there is a risk of damage to surrounding areas. Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and the present invention provides a method for limiting the range of fuel leakage and the time when there is a risk of ignition, the possibility of combustion by volatile gas, It is an object of the present invention to provide a fuel-dispersing pavement structure of a gas station which minimizes the height of a flame during combustion. [0006] In order to achieve the above object, the present invention secures a minimum pavement thickness of 10 cm in the reach of a discharge port of a fueling means of a fueling facility installed at a gas station.
The bottom surface is paving to form a predetermined gradient, cement
Doo concrete mixture 1m ³ per 300~400kg
Portland cement, 1 part by weight of cement
0.005 to 0.1 parts by weight of binder and 0.35 to
Consists of 0.45 parts by weight of water and the balance of aggregate
At this time, the passing weight percentage of the aggregate to the 5 mm sieve is
50-100%, passing weight percentage for 2.5mm sieve
Is 8 at a water / cement weight ratio of 0.35 to 0.43.
２５25%, water / cement weight ratio of 0.43-0.45
0-18% under the conditions, the passing weight for 1.2 mm sieve
A permeable concrete pavement having a particle size distribution in which the amount percentage is 0.0 to 6.0%, and the permeable concrete pavement is disposed on the lower slope side of the permeable concrete pavement surface and has penetrated the permeable concrete pavement. A drain pipe network for collecting and draining leaked fuel or water and an oil / water separation tank connected to a terminal of the drain pipe network are provided. An embodiment of the fuel non-diffusion pavement structure of a gas station according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a fixed weighing machine 1 as a refueling means installed on the site of a gas station, and a fuel non-diffusion pavement structure provided on a general slab on both sides of an island where the weighing machine 1 is installed. 3 is a cross-sectional view showing a part of the cross section of FIG.
The island 2 shown in the figure is provided in a refueling open space in consideration of the vehicle flow line, for example, as in the plan view shown in FIG. A stop space for a refueling vehicle is provided along the elongated island 2, and a fuel non-diffusion pavement is paved in that space. In this embodiment, permeable concrete pavement is used as the fuel non-diffusion pavement.
This permeable concrete is a concrete for permeable pavement which has already been developed by the applicant. As one embodiment of the composition, 300 to 400 kg of Portland cement per 1 m ^{3 of} cement concrete mixture, 1 part by weight of cement It is composed of 0.005 to 0.1 parts by weight of a binder, 0.35 to 0.45 parts by weight of water, and the balance of aggregate, wherein the passing weight percentage of the aggregate to a 5 mm sieve is 50 to 100. %, The passing weight percentage with respect to a 2.5 mm sieve is a water / cement weight ratio of 0.35 to 0.5%.
8 to 25% under the condition of 43, water / cement weight ratio 0.4
0-18% under conditions of 3-0.45, 1.2 mm
It consists of a permeable concrete having a particle size distribution with a passing weight percentage on the sieve of 0.0 to 6.0%. The paving range is set so as to include a range where the vehicle 5 stops for refueling and a range where the discharge port of the refueling hose reaches. [0009] A concrete pavement constituting the general slab 3 is paved around the permeable concrete pavement portion, and has a predetermined slope toward the periphery of the site. In the present embodiment, the boundary between the side and the bottom of the permeable concrete pavement portion and the concrete base is one-sided.
1 is attached. A perforated drain pipe 13 around which crushed stones 12 are arranged is laid on the terminal side having a low gradient.
The perforated drainage pipe 13 collects fuel such as gasoline spilled on the pavement surface due to rainwater that has penetrated into the fuel non-diffusion pavement structure or leaked during refueling, and an oil-water separator installed underground on the site. It is piped to the tank. It is needless to say that the shape of the bottom surface of the permeable concrete pavement portion can be appropriately designed such as a central gradient, a single gradient, and the like, as long as the gradient allows water or fuel permeated into the pavement to be collected. Absent. FIG. 2 is a schematic plan view showing an example of a plane layout of a gas station. As shown in the figure, when determining the plane layout, the islands 2 are arranged based on a predetermined vehicle flow line in accordance with the shape and size of the refueling open space 4. Then, the plane range of the fuel non-diffusive pavement is set in consideration of the extendable range of the refueling hose of the fixed weighing machine 1 installed on the island 2 and the range of the vehicle 5 stopped at the time of refueling. And drain pipe 13 from each fuel non-diffusion pavement part
Is installed in a net-like shape, and an oil-water separation tank 1
4 is installed. In addition, by providing the canopy 15 having a plane including the stop position of the island 2 and the refueling vehicle 5, it is possible to minimize infiltration of rainwater into the permeable concrete pavement portion as the fuel non-diffusion pavement. it can. Needless to say, it is preferable to similarly provide a fuel non-diffusion pavement near the kerosene refueling meter and the underground tank inlet. In the case of a non-space weighing machine equipped with an overhead pump, the stop position of the refueling vehicle 5 tends to be undefined. For this reason, it is preferable to construct the fuel non-diffusion pavement over a wide area including a range in which a plurality of refueling hoses are maximized. As a surface finish of the permeable concrete pavement, it is also preferable to provide a pavement surface material in which a single-grain aggregate is combined with a resin and cement. In this case, it is also preferable to partially color the pavement surface with the pavement surface layer material and perform marking for guiding and ensuring safety. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to determine an appropriate pavement thickness of a permeable concrete pavement to be employed in the above-described fuel non-diffusion pavement structure,
The following experiment was performed. In the test body test, fuel is present on the surface of non-permeable concrete, and the fuel burns directly, so that the burning property is different from that of the permeable concrete pavement. For this reason, it was judged that it was not suitable for direct comparison, and the combustion experiment was limited to comparison with permeable concrete pavement. The experimental procedure and the experimental results will be described below. (1) Permeable concrete specimen (30 × 3
0 × pave thickness (cm)). Pavement thickness: 8, 12, 16 (cm) All the test pieces were covered on both sides and the bottom face with a 5 cm-thick ordinary concrete to make them impermeable. It was confirmed by a water permeability test that the void amount was 25%. (2) Inject a specified amount of gasoline into the specimen. At the time of injection, a mold having a diameter of 10 cm was used as an injection port guide so that the injection port area was constant. Injection amount: 100, 300, 500, 700, 1000,
1500 (ml) (3) After injection of each injection amount of gasoline, the injection port is ignited about 5 seconds later, the burning time from the start of combustion of the gasoline injected into the test body to spontaneous extinction, the injection port immediately after spontaneous extinction Of the sample was measured. Tables 1 to 3 and graphs 1 to 3 show the measurement results. The injection diameter refers to the diameter of the fuel spread on the pavement immediately after injection. [Table 1] When the combustion mode in each case was confirmed, after ignition, the combustion range almost coincided with the injected location, and no expansion of the combustion range on the pavement surface was observed. The burning time is about 40 to 60 seconds, irrespective of the injection amount, except for the case with a thickness of 8 cm. This indicates that fuel is not supplied because gasoline accumulated at the bottom does not rise in the voids in the permeable concrete due to capillary action. Further, it was also found that even if the volatile gas rises in the gap, the supply of oxygen into the gap is small, so that combustion does not reach the inside. Therefore, in consideration of the experimental results and workability, a pavement thickness of 10 cm can be expected as the minimum pavement thickness. On the other hand, the maximum pavement thickness is preferably set to about 20 cm from the viewpoint of economy and workability of the permeable concrete pavement. As described above, the present invention has the effect of reliably preventing the occurrence of fire due to leakage of fuel or the like at a gas station.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic partial sectional view showing one embodiment of a fuel non-diffusion pavement structure of a gas station according to the present invention. FIG. 2 is a schematic plan view showing an example of a planar layout of a fuel non-diffusion pavement structure of a gas station according to the present invention. FIG. 3 is a graph (1, 1) showing the results of a specimen combustion experiment.
2). FIG. 4 is a graph (3) showing the results of a test body combustion experiment. [Description of Signs] 1 Weighing machine 2 Island 10 Fuel non-diffusion pavement structure 13 Drain pipe 14 Oil / water separation layer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E01C 9/00 B60S 5/02

Claims (1)

(57) [Claims] [Claim 1] The minimum pavement thickness of 10 cm is ensured in the reach of the discharge port of the fueling means of the fueling equipment installed at the fueling station.
300 to 40 per m ^{3 of} cement concrete mixture , which has been laid so that the bottom has a predetermined slope.
0 kg Portland cement, 1 part by weight of cement
0.005 to 0.1 parts by weight of binder and 0.35
0.45 parts by weight of water and the balance of aggregate
At this time, the passing weight percentage of the aggregate to the 5 mm sieve is
50-100%, passing weight percentage for 2.5mm sieve
Is 8 at a water / cement weight ratio of 0.35 to 0.43.
２５25%, water / cement weight ratio of 0.43-0.45
0-18% under the conditions, the passing weight for 1.2 mm sieve
A permeable concrete pavement having a particle size distribution in which the amount percentage is 0.0 to 6.0%; and a permeable concrete pavement which is disposed on the lower slope side of the permeable concrete pavement surface and penetrates the permeable concrete pavement. A fuel non-diffusion pavement structure for a gas station, comprising: a drainage pipe network for collecting and draining leaked fuel or water; and an oil / water separation tank connected to a terminal of the drainage pipe network.