JPH0574696U - Septic tank - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents water leakage due to corrosion of metallic bolts, and prevents flanges during transportation and transportation even when stored outdoors from the time of inventory storage to the on-site installation work. To provide a septic tank that prevents rainwater from accumulating on workers. [Structure] A lower tank 2 having a bottom portion and a peripheral side wall, which is opened upward, a flange portion 2a is provided around the opening, and a rising portion 2b is provided outside the flange portion 2a, a ceiling provided with an inspection port, and a peripheral side wall. Becomes a downward opening, and the flange portion 1a is formed around the opening.
The upper tank provided with is connected to the flanges 1a and 2a through the packing with bolts 7, washers 12, and nuts 8 to form a septic tank, and the outer diameter of the bolt 7 is set to the upper and lower tanks 1, 2 Bolt insertion hole 5 provided in flange portion 1a, 2a of
The inner diameter of the bolt 7 is smaller than the inner diameter of the bolt 7, and the bolt insertion hole 5 is formed with the bolt 7, washer 12, nut 8
And the groove portion 3 communicating with the bolt insertion hole 5 and extending to the outside of the washer 12 is provided in the flange portions 1a, 2a of the upper and lower tanks 1, 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in the connection structure of flanges in a septic tank.

[0002]

[Prior Art]

 As shown in FIG. 6 and FIG. 7, the conventional septic tank is composed of a bottom portion formed of synthetic resin such as FRP and a peripheral side wall, and is opened upward, and a horizontal flange portion 2a is provided around the opening, and the outside of the flange portion 2a is provided. In addition, a lower tank 2 provided with a rising portion 2b projecting upward for the purpose of facilitating the alignment work of the inner walls of the upper and lower tanks and reinforcing the flange portion, and a synthetic resin such as FRP. The upper tank 1 is composed of a ceiling with a plurality of inspection openings at the top and a peripheral side wall, and the upper tank 1 has a downward opening and a horizontal flange portion 1a is provided around the opening, and the bolt insertion holes of the flange portions 1a and 2b. Was fastened and fixed with bolts 7, washers 12 and nuts 8 via packing (not shown).

[0003]

[Problems to be solved by the device]

 However, most of the large-scale septic tanks made of FRP as described above are assembled and produced in factories, so they are usually stored outdoors from inventory storage to the time of on-site installation work. Therefore, as shown in FIG. 7, since the rising portion 2b protruding upward is formed on the outer side of the flange portion 2a of the lower tank 2, rainwater 11 is collected and the rainwater causes the metallic bolt 7 (and nut in some cases) to be collected. There is a problem of corrosion and water leakage. Further, there is a problem that the operator is exposed to the rainwater 11 collected on the flange portion when the septic tank is moved or transported.

The present invention has been made in view of the above-mentioned problems, and even when stored outdoors from inventory storage to local installation work, water leakage due to corrosion of metallic bolts The purpose is to provide a septic tank that prevents workers from being exposed to rainwater collected on the flange during transportation and transportation.

[0005]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described below with reference to FIGS. 1 to 5 corresponding to the embodiments. The present invention is composed of a bottom portion and a peripheral side wall, and an upper opening is provided, and a flange portion is provided around the opening. The upper tank with the lower tank, which has a rising portion outside the flange, the ceiling with the inspection port, and the surrounding side wall, and the upper tank with the flange portion around the opening, are packed together. In a septic tank in which bolts, washers, and nuts are used to fasten the bolts, the outer diameter of the bolt is formed to be smaller than the inner diameter of the bolt insertion hole provided in the flange of the upper and lower tanks. A technical means is provided in which the insertion hole is fastened with the bolt, washer, and nut, and a groove communicating with the bolt insertion hole and extending to the outside of the washer is provided in the flange portion of the upper and lower tanks.

The groove portion in the present invention is not particularly limited in the number, cross-sectional shape, and depth dimension, but among these, the depth dimension is insufficient in consideration of the relationship with the wall thickness of the upper tank and the lower tank. It is necessary to set it so that it does not become.

[0007]

[Action]

 According to the present invention, rainwater collected between the side wall of the upper tank flange and the rising portion of the lower tank flange is inserted through the groove on the outer side of the washer and the groove under the washer by the above means. It falls through the gap between the holes and travels down the groove under the washer on the lower tank flange, and then falls naturally from the groove on the outside of the washer.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 is a partially cutaway perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a partially cutaway view showing the relationship between a groove portion and a bolt insertion hole in FIG. It is a perspective view.

Reference numeral 2a denotes a connecting flange portion which is horizontally formed around the opening of the upper tank 1 which is formed of a synthetic resin and has a bottom portion and a peripheral side wall, and which is open upward, and is provided outside the flange portion 2a. In order to facilitate the work of aligning the inner walls of the upper and lower tanks with each other, a rising portion 2b protruding upward is provided for the purpose of reinforcing the flange portion. Reference numeral 1a denotes a flange portion which is made of a synthetic resin such as FRP and has a ceiling provided with a plurality of inspection openings on the upper portion thereof and a peripheral side wall, and is formed horizontally around the opening of a lower tank opened downward. Then, the flange portion 2a of the lower tank 2 and the flange portion 1a of the upper tank 1 are fastened with a washer 12 / bolt 7 and a washer 12 / nut 8 both above and below via packing. Reference numeral 5 denotes a bolt insertion hole that is provided so as to penetrate through a center portion in the width direction between the flange portion 2a and the flange portion 1a, and has a diameter of a size such that a gap 6 is formed between the bolt 7 and the bolt 7 when the bolt 7 is inserted. The plurality of bolt insertion holes 5 are formed around the flange portion at regular intervals. Then, around the surface of the bolt insertion hole 5, there is formed a groove portion 3 that crosses the bolt insertion hole 5 and reaches both ends in the width direction of the flange portion 1a and is thinner than the diameter of the washer 12 having a substantially U-shaped cross section. In addition, the back surface of the bolt insertion hole 5 crosses the bolt insertion hole 5 and reaches a distance slightly longer than the outer diameter dimension of the washer in the width direction of the flange portion 2a. A groove 4 thinner than the diameter of 12 is formed. With the above-described configuration, rainwater collected in the upper tank flange 1a has a groove 6 provided in the upper tank flange 1a, a gap 6 between the bolt insertion hole 5 and the bolt 7. , Falls along the groove portion 4 provided on the lower tank flange portion 2a to the ground.

In the above embodiment of the present invention, there are two combinations of the upper tank and the lower tank. However, the present invention is not limited to the above embodiment, and a combination of a plurality of upper tank, middle tank, lower tank, etc. However, a flange structure similar to the above can be applied.

FIG. 4 is a partially cutaway perspective view showing the relationship between the groove portion 9 and the bolt insertion hole 5 according to another embodiment of the present invention. The groove portion 9 of the flange portion 1 a is parallel to the side wall of the upper tank 1. In addition, it is formed so as to cross the central portion of the plurality of bolt insertion holes 5. The groove portion 9 of the flange portion 2a is also formed in the same manner as described above so as to be parallel to the side wall of the lower tank 2 and to cross the central portions of the plurality of bolt insertion holes 5.

FIG. 5 is a partially cutaway perspective view showing the relationship between the groove portion 10 and the bolt insertion hole 5 according to another embodiment of the present invention. The groove portion 10 of the flange portion 1 a is parallel to the side wall of the upper tank 1. In addition, the length is made larger than the diameter of the washer by making it discontinuous so as to traverse the center of each bolt insertion hole 5. The groove portion 10 of the flange portion 2a is also formed in the same manner as above. (Not shown)

[0013]

[Effect of the device]

 The present invention comprises a bottom tank having a bottom portion and a peripheral side wall, an upper opening, a flange portion around the opening and a rising portion outside the flange portion, a ceiling provided with an inspection port, and a peripheral side wall. To form a septic tank that is opened downward and is fastened with bolts, washers, and nuts to the upper tank that has a flange portion around the opening and the flange portion is fastened via packing, and the outer diameter of the bolt It is formed to have a smaller diameter than the inner diameter of the bolt insertion hole provided in the flange portion of the tank, and the bolt insertion hole is fastened with the bolt, washer, and nut, and communicated with the bolt insertion hole. Since the groove that extends to the outside of the washer is provided on the flanges of the upper and lower tanks, metal bolts will not corrode even if they are stored outdoors from inventory storage to the on-site installation work. Prevent water leakage It is collected by, when moving, rain water collected in the flange even when the transport is in which an effect that is never exerted on the operator.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partially cutaway perspective view showing a relationship between a groove portion and a bolt insertion hole that can be placed in FIG. 1.

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

FIG. 5 is a partially cutaway perspective view showing another embodiment of the present invention.

FIG. 6 is an overall perspective view showing a conventional septic tank connection structure.

FIG. 7 is a partially cutaway perspective view of part A of FIG.

[Explanation of symbols]

1. Upper tank 2. Flange 2a, Flange 2b, Rise 3. Groove 4. Groove 5. Bolt insertion hole 6. Bolt insertion hole 7. Bolt 8. Natto 9. Groove 10, Groove 11, Rainwater 12. Washer

Claims (1)

[Scope of utility model registration request] 1. A lower tank having a bottom portion and a peripheral side wall and having an upper opening, a flange portion provided around the opening and a rising portion outside the flange portion, a ceiling having an inspection port, and a peripheral side wall. The lower tank is opened and the upper tank is provided with a flange portion around the opening.
A septic tank is formed by fastening with washers and nuts, and the outer diameter of the bolt is formed to be smaller than the inner diameter of the bolt insertion hole provided in the flanges of the upper and lower tanks. A septic tank characterized by being fastened with the bolts, washers, and nuts, and having groove portions communicating with the bolt insertion holes and extending to the outside of the washer are provided in the flange portions of the upper and lower tanks.