JP2005304198A - Protective iron lid of superficial buried object for electric wire common duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective iron lid for preventing a break trouble in an underground buried object from occurring so as to prevent the underground buried object buried in the ground under a pavement and a road and including a power line and an information line from erroneously being cut by a concrete cutter and a drill under road maintenance construction. <P>SOLUTION: An iron lid 8 is constructed on a concrete trough 4 for constituting the electric wire common duct as the underground buried object superficially buried in the ground under the road. The protective iron lid has the iron lid 8 comprising a lid 9 installed on the trough 4, and side plates 10, 11 integrated into the lid 9, closely contacting and vertically installed along both side faces of the trough 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a protection method for preventing underground buried objects buried in a ground immediately below a sidewalk and a road from being accidentally cut during road repair work.

Buried objects that are buried in the ground directly under the sidewalks and roads have been required to be buried relatively shallowly due to economic circumstances. However, if this concrete trough as a buried object is accidentally cut by a concrete cutter, excavator, etc. used for road construction and lifeline construction, power failure and online and telephone lines of surrounding banks etc. It is intended to provide a protective measure to prevent this from occurring.
Japanese Patent No. 3418858 (Japanese Patent Laid-Open No. 11-201324)

In view of the circumstances as described above, the present invention proposes a protective iron lid that can prevent an accident of cutting underground buried objects during road repair work, and the problems to be solved by the present invention are mainly the following points. Exist. That is,
1) The iron lid can occupy a stationary state with respect to the trough in which the embedded object is built.
2) Ensure the required protective performance.
3) It must be lightweight as a whole.
4) The ability to keep a low price.
5) Capability to fully protect buried objects including joints.
6) Good workability on site.

  The protective iron lid according to claim 1 is a protective iron lid that is laid on a concrete trough that is embedded relatively shallowly in the ground directly under a sidewalk and road and constitutes an electric wire common groove. Comprises a lid portion mounted on the trough, and side plate portions that are integral with the lid portion and are closely suspended along both side surfaces of the trough.

  According to the protective iron lid of claim 2, the lid portion and the side plate portions on both sides thereof are formed by welding in claim 1.

  According to a third aspect of the protective iron lid of the present invention, the lid portion and the side plate portion according to the first aspect are integrally manufactured by rolling with a deformed shape steel.

  According to the protective iron lid of the fourth aspect, the lid portion includes a part of the lid part and a side plate part integral with the part, and a part of the lid part is butt-welded and integrated.

  According to the protective iron lid of the fifth aspect, the thickness of the side plate portion is based on ≧ 25 mm for soft iron (hard-cutting steel plate) and ≧ 50 mm for ordinary steel (SS400).

  According to the protective iron lid of the sixth aspect, the thickness of the lid portion is ≧ 12 mm for soft iron (hard-to-cut steel plate) and ≧ 16 mm for ordinary steel.

  According to the protective iron lid according to claim 7, in the iron lid according to any one of claims 1 to 4, the lid portion and the same kind of material are formed over the entire surface of one side end portion of the lid portion and the side plate portion. It is formed by joining the protruding edge portions for joint protection.

  According to the present invention, the reliability of this kind of road repair work can be enhanced and the safety of shallow buried objects can be ensured by the protective iron lid that can avoid the risk of erroneous cutting of the buried object during road repair work. is there.

  FIG. 1 shows an actual use situation, in which a concrete or asphalt layer 2 and an earth and sand layer 3 are formed under a ground surface portion 1 of a road, and a long concrete trough 4 is buried under the ground. . The concrete trough 4 is composed of a main body 6 in which an electric wire 5 is disposed, and a lid 7 covering the top of the main body 6. In the present invention, an iron lid 8 is laid on the concrete trough 4.

  Several proposals are made for the iron lid 8. First, the iron lid 8 shown in FIG. 1 is made of soft iron and is laid over the entire upper surface of the concrete trough 4. It consists of the side plate parts 10 and 11 which are comprised with the soft iron of the same quality as the part 9, and are closely hung with respect to the outer side of the said trough 4 in both sides. FIG. 2 shows the lid portion 9 and the side plate portions 10 and 11 formed by welding. Further, FIG. 3 shows the cover portion 9 and the side plate portions 10 and 11 that are integrally formed of deformed steel.

  FIG. 4 shows another structure of the iron lid 8, which is composed of a part (actually upper half) 12 of the lid part made of soft iron and a part of the side plate part (any one of the actual upper side plate parts 10 and 11). Half bodies 13 and 14 are provided, and these half bodies 13 and 14 are integrated by welding 15. How to select the halves 13 and 14 shall be made as necessary.

  5 and 6 show a case in which the iron lid 8 is cut from the side by a cutting machine 16 using, for example, a 1800 cc automobile engine (FIG. 5), and the iron lid 8 is cut by the same cutting machine 16. Experimental data for the case of cutting from the upper surface (FIG. 6) are shown.

In the configuration of FIG. 5, regarding the thickness ta of the side plate portion 10 (or 11), the conditions that the protection ta should have are as follows according to the experimental data.
Category Steel type ta
Side plate partial protection Soft iron (hard-to-cut steel plate) ≧ 25mm
Normal steel (SS400) ≧ 50mm

In the configuration of FIG. 6, regarding the thickness tb of the lid portion 9, the conditions that tb should have for protection are as follows according to the experimental data.
Category Steel type tb
Lid partial protection Soft iron (hard-to-cut steel plate) ≧ 12mm
Normal steel (SS400) ≧ 16mm

  FIG. 7 and FIG. 8 show joint protection measures, and a conventional protective plate generally has a method of arranging protective plates of a fixed length (for example, width 500 × length 600) in series. When there is a cutting blade in the joint, there is a risk of being cut where it is not on the protective plate. In contrast, the present invention proposes countermeasures for joints.

  That is, as shown in FIG. 7, the joint-protecting protruding edge portion 18 is joined across the joint portion 17 between the iron lids 8, 8, 8. As its structure, it is only necessary to install joint protection plates at one end (longitudinal direction) at the factory and arrange them sequentially at the site, and the workability at the site is also excellent. As shown in FIG. 8, the projecting edge portions 10a and 11a are formed on the side plate portions 10 and 11, and the projecting edge portion 9a (see FIG. 8) is formed on the lid portion 9 to constitute the projecting edge portion 18 as a whole. is there.

  In this way, even in the situation where the cutting blade of the cutting machine 16 is applied to the joint portion 17, it is possible to avoid causing unnecessary cutting, and an extremely large proposal has been made for this kind of protection method. It is.

It is sectional drawing which shows the example which utilized the protective iron lid of this invention for the concrete trough as a buried object in the ground. It is a perspective view which shows the structure by welding as a protective iron lid. It is a perspective view which shows an example of the protective iron lid of this invention. It is a perspective view which shows the other example of the protective iron lid of this invention. It is sectional drawing of the condition which cut | disconnects the protective iron lid of this invention from the side. It is sectional drawing of the condition which cut | disconnects the protective iron lid of this invention from upper direction. It is a perspective view which shows the joint countermeasure at the time of arranging a protective iron lid in parallel. It is sectional drawing of a part of lid part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground surface part 2 Concrete or asphalt layer 3 Earth and sand layer 4 Concrete trough 5 Electric wire 6 Main body 7 Lid 8 Iron lid 9 Lid part 10 Side plate part 11 Side plate part 12 Part of lid part 9 13 Half body (of side plate part 10)
14 half (side plate part 11)
15 Welding 16 Cutting machine 17 Joint part 18 Edge part

Claims (7)

An iron lid buried on a concrete trough that is buried relatively shallowly in the ground directly under the sidewalk and road and constitutes an electric wire joint groove, the lid portion on which the iron lid is placed on the trough; and A protective iron lid for a shallow buried object for an electric cable joint groove, comprising a side plate portion which is integral with the lid portion and hangs closely along both sides of the trough. The protective iron lid of the shallow buried part for electric wire joint grooves according to claim 1, wherein the lid portion and side plate portions on both sides thereof are formed by welding. The protective iron cover of the shallow buried object for electric wire joint grooves according to claim 1, wherein the cover part and the side plate part are integrally manufactured by rolling with deformed steel. The protective iron cover of the shallow buried object for a wire joint groove according to claim 1, comprising a part of the lid part and a side plate part integral with the part, and a part of the lid part is integrated by butt welding. . The protective iron cover of the shallow buried object for an electric cable joint groove according to claim 1, wherein the side plate portion has a thickness of ≧ 25 mm for soft iron (hardly cut steel plate) and ≧ 50 mm for ordinary steel (SS400). The protective iron lid of the shallow buried object for electric wire joint grooves according to claim 1, wherein the thickness of the lid portion is ≧ 12 mm for soft iron (hardly cut steel plate) and ≧ 16 mm for ordinary steel (SS400). The electric wire joint groove according to any one of claims 1 to 4, wherein a joint protecting edge portion made of the same material as the lid portion is joined to the entire surface of one end portion of the lid portion and the side plate portion. Protective iron cover for shallow buried objects.

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