JP5131606B2 - Underground iron cover - Google Patents

Description

  The present invention relates to a structure of an engagement portion between a lid body and a receiving frame that opens and closes in a structure such as underground wiring, piping, and the like, and in an underground iron lid that serves as an opening used for sewer maintenance.

  The above parts have various problems such as noise generation due to passing through the vehicle, difficulty in opening and closing the lid, correlation between strength and lid weight, and there is no complete structure at present.

Conventionally, two types of lid receiving structures, a flat receiving structure and a tapered receiving structure, have been universal, and the former has a structure having a flat receiving surface on which a bottom surface parallel to the upper surface of the lid body is placed on the receiving frame. In the latter, the cover receiving surface of the receiving frame is formed in a conical shape with a concavity, and the cover body is formed in a relationship between the conical shape of the receiving frame and the male and female .

In terms of noise generation, the former is more prone to beating and the latter is silent and excellent .

In terms of the difficulty of opening and closing the lid, the former may not be a problem, and the latter may not be able to cope with situations where an emergency opening such as a fire hydrant lid may occur due to excessive bites .

  Regarding the correlation between strength and lid weight, the former is the strength calculation of both ends (or outer periphery) free support beam (plate), the latter is the strength calculation of both ends (or outer periphery) fixed support beam (plate), the same strength The required wall thickness is about half that of the latter, which contributes to weight reduction.

  In the latter case, a rolling phenomenon due to an uneven load may occur.

  An object of the present invention is to provide a steel lid structure that prevents the generation of noise, facilitates opening and closing of the lid, reduces the weight of the lid, and prevents the rolling phenomenon. .

The technical means for solving the above-mentioned problem is that the circular underground iron lid in which the lid body (3) is placed on the receiving frame (1) having the lid receiving portion, the opening of the lid receiving portion is provided. The upper frame body first inclined surface (6) which is inclined at a predetermined angle (α) with respect to the vertical so that the cross section of (2) becomes wider above the opening (2) through the frame body horizontal surface (5). ) And the lower frame body second inclined surface (4) inclined at an angle (β) whose vertical angle is smaller than the angle (α), and the outer cross-section of the lid (3) is also the lid horizontal surface (8). ) And an upper lid first inclined surface (9) inclined at a predetermined angle (α) with respect to the vertical so as to be widened upward, and an angle (β that is smaller than the angle (α) with respect to the vertical ) And the lower first inclined surface (6) in the state where the lower second inclined surface (7) is inclined and the cover (3) is placed on the receiving frame (1). And the lid first inclined surface (9) are in contact, the frame second inclined surface (4) and the lid second inclined surface (7) are in contact, and the frame horizontal surface (5) and the lid horizontal surface. (8) is in a separated state.

The front sectional view of the lid state of the important section which carried out the present invention. Front sectional drawing of the closed state which implemented the taper receiving structure of the conventional structure. The enlarged view of the A section shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a receiving frame 1 having an opening 2, a frame body second inclined surface 4 and a frame body horizontal plane 5 which are opened at an angle β with the edge surface of the opening 2 as a base point, constituted by a frame member first inclined surface 6 which open onto the large becomes an angle α from the slightly larger径且one angle β from the frame member second inclined surface 4 above, 3 the second inclined surface 4, respectively the frame A lid 3 having a lid first inclined surface 9 corresponding to the lid horizontal surface 8 and the frame first inclined surface 6 by providing a gap with respect to the corresponding second lid inclined surface 7 and the frame horizontal surface 5. Is shown. The frame second inclined surface 4 and the lid second inclined surface 7, and the frame first inclined surface 6 and the lid first inclined surface 9 are in contact with each other, and the frame horizontal surface 5 and the lid are in contact with each other. The body horizontal plane 8 is separated.

As a result, the main stress of the gravitational load, which is an external force, is carried by the frame first inclined surface 6 and the lid first inclined surface 9 so that the biting phenomenon is prevented if the angle α is appropriately selected . This also likely to occur rolling phenomenon angle α than made small angle β frame second inclined surface 4 of is the also prevented by carrying lid second inclined surface 7. In particular, since the frame first inclined surface 6 and the lid first inclined surface 9, and the frame second inclined surface 4 and the lid second inclined surface 7 are in contact with each other at different angles, the biting phenomenon and the rolling phenomenon. It has a high effect on prevention. Even if a rolling phenomenon occurs, the frame horizontal plane 5 and the lid horizontal plane 8 have a gap in the vertical direction, so that the frame horizontal plane 5 and the lid horizontal plane 8 do not contact each other, and a hitting sound is generated. do not do. Further, even if the frame first inclined surface 6 and the lid first inclined surface 9, and the frame second inclined surface 4 and the lid second inclined surface 7 are in contact with each other, the contacting surfaces are conical inclined surfaces. Therefore, it is not necessary to move the lid 3 up and down in parallel and vertically when the lid 3 is opened and closed, and the lid 3 can be easily opened and closed.

FIG. 2 illustrates the rolling phenomenon in the conventional taper receiving structure. In the structure of the receiving frame 11 and the cover body 12, when the offset load P is applied to the end surface of the cover body 12, the end point is caused by the presence of the gap 13. 14, the opposite end point 15 is lifted by the arrow Q. When comparing the angle 16 and the angle 17 in the enlarged view of the range A, FIG. 3, the angle 16 with respect to the tangent of the arrow Q at the end point 15 is 16 Is in the direction of escaping, is slippery, and does not move because it works in the direction of biting at angle 17. By incorporating angle 16 as α and angle 17 as β, which is slightly smaller than this, it is difficult to bite and rolling. This is to prevent the occurrence of the phenomenon.

DESCRIPTION OF SYMBOLS 1 Receiving frame 2 Opening part 3 Lid body 4 Frame 2nd inclined surface 5 Frame horizontal surface 6 Frame 1st inclined surface 7 Lid 2nd inclined surface 8 Lid horizontal surface 9 Lid 1st inclined surface 11 Receiving frame 12 Lid 13 Clearance 14 End point 15 Opposite end point 16 Angle α
17 Angle β

Claims (1)

In the circular underground iron lid in which the lid (3) is placed on the receiving frame (1) having the lid receiving portion,
An upper frame that is inclined at a predetermined angle (α) with respect to the vertical so that a cross section of the opening (2) of the lid receiving portion is widened above the opening (2) via the frame horizontal plane (5). A body first inclined surface (6), and a lower frame body second inclined surface (4) inclined at an angle (β) having a smaller angle with respect to the vertical than the angle (α),
An upper lid first inclined surface (9) inclined at a predetermined angle (α) with respect to the vertical so that the outer peripheral cross section of the lid (3) is also widened upward via the lid horizontal surface (8). The lower lid second inclined surface (7) is inclined at an angle (β) whose angle to the vertical is smaller than the angle (α),
In a state where the lid (3) is placed on the receiving frame (1), the frame first inclined surface (6) and the lid first inclined surface (9) are in contact with each other, and the frame second inclined surface ( 4) and the lid second inclined surface (7) are in contact with each other, and the frame horizontal surface (5) and the lid horizontal surface (8) are in a separated state.
Underground iron cover characterized by that.

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