JP5419566B2 - Pit lid - Google Patents

Description

The present invention relates to a pit cover that closes an opening in a cable pit for laying a power or communication cable, and more particularly, to a pit cover that is lightweight and does not float or scatter due to wind pressure or the like.

A pit that accommodates a cable for electric power or communication is formed in a U-shaped cross-section with an open upper surface so as to facilitate cable laying work. Therefore, a pit lid that closes the top opening of the cable pit is arranged to prevent foreign material from entering the pit. Usually, such a pit lid is formed of concrete or steel plate and its weight It is designed to prevent lifting and disengagement, so that the burden on the operator is heavy during laying work, maintenance, repair, etc., and because of its weight, long ones can not be used and work efficiency is poor There is a problem.

Therefore, in order to solve the above-described problems in work, the pit lid is also formed with a synthetic resin, but because of its light weight, it is easy to lift due to wind pressure or the like. In order to prevent excessive lifting, a connecting hole penetrating the front and back is formed in the vicinity of the joining end surface portion of the adjacent pit lid, and the legs of the connecting metal fitting are connected to a pair of adjacent connecting holes sandwiching the joining end surface portion. It is proposed that the adjacent pit lids are connected to each other, and that the connecting hole is inclined downward toward the side wall of the pit so that the end of the leg of the connecting bracket abuts on the pit side wall ( Patent Document 1).

  In addition, the trough (pit) and the lid are made of synthetic resin, and a protrusion having a slot is provided on the outside of the both side walls of the trough, and the slot is also provided on the lid at a position corresponding to the slot. It is also proposed to cover the upper surface of the lid and insert the leg portion into a slot provided in the lid and the trough, and hook the tip end of the leg portion to the edge of the lower end of the trough slot (Patent Document 2).

  However, since the pit lid made of synthetic resin is inferior in rigidity, it is difficult to use it for a wide pit, and there is a problem in durability because it is easily deteriorated by sunlight or the like outdoors. In addition, in the former fixing means, the lid is connected and lengthened by connecting the metal fitting, and the tip of the rod-shaped metal fitting is brought into contact with the pit side wall to prevent the lift, but it comes into contact with the pit side wall. Since the contact force is weak and the locking force is weak, a step is provided on the top surface of the pit, and when it is placed on a pit on the flat top surface, as shown in FIG. In addition, the latter fixing means has a problem that the trough and the lid have a specific structure and the lid itself cannot be applied to the existing trough.

Registered Utility Model No. 3045816 JP 2008-17573 A

The present invention has been made in view of the above-mentioned problems of the prior art. A pit lid having high versatility that is highly rigid and can be securely fixed to a pit despite being lightweight and can be easily attached to and detached from a cable pit. It is intended to provide.

  In the present invention, the lid body of the pit lid is made of aluminum, and has a hollow structure that achieves both weight reduction and high rigidity. Further, the back surface of the lid body is elastically brought into contact with the inner wall of the pit with a strong pressing force. The above-mentioned problems are solved by providing a fixing member and preventing lifting and scattering due to wind pressure or the like accompanying weight reduction.

That is, the above-mentioned problem is (1) “a pit lid for closing an opening of a cable pit of the present invention, and the pit lid is attached to a lid body made of an aluminum hollow body and a back surface of the lid body. And at least a pair of fixing members that elastically contact the inner surfaces of both side walls of the cable pit, and the fixing members are formed of elastic plate-like bodies and attached to the back surface of the lid body, It is composed of an intermediate part that hangs down from one end of the mounting part, and a locking part that is bent in a mountain shape from the lower end of the intermediate part toward the pit side wall and the top part is in contact with the inner surfaces of both side walls of the cable pit. (2) “The attachment portion has a long hole, and is attached to the lid main body by a screw or a bolt through the long hole.” (1) Pit cover ", ( ) “The fixing member is formed by bending a belt-like elastic body to integrate the attachment portion, the intermediate portion, and the abutting portion according to the above-mentioned item (1) or (2). (4) “A pit cover according to any one of (1) to (3), wherein the fixing member is made of stainless steel”. Is done.

The pit cover of the present invention is light in weight because the lid body is formed of a hollow body made of aluminum, and has a low burden on the operator during laying work, maintenance, repair, etc. Since it can be used for cable pits, there is no limit to the pit width like a synthetic resin lid, and it can be fixed simply by placing it on the pit, so it can be easily applied to existing pits. In addition, the work efficiency can be improved because the pit cover can be made long.

In addition, the fixing member is attached to the back surface of the lid body, the intermediate portion hanging from one end of the attachment portion, the bent from the lower end of the intermediate portion toward the pit side wall in a mountain shape, and the top portion on both side walls of the cable pit Since it is composed of a contact part that contacts the inner surface, when mounting on the cable pit, the lower part of the mountain-shaped locking part contacts the inner end of the upper surface of the cable pit, and positioning can be performed automatically. In addition, the pressing force due to elasticity concentrates on the top, which is a mountain-shaped contact portion, and since these are plate-shaped, the contact portion becomes longer, the pressure is stable, and it can be securely fixed to the cable pit. In addition, since the intermediate part is interposed between the attachment part and the contact part, the pressing force can be changed by adjusting the length of the intermediate part. The fixing force can be adjusted accordingly. , It can be changed the abutment position of the locking portion with respect to the cable pit sidewalls, even in cable pits having a steep inclined surface at the upper portion of the side wall, it is possible to reliably fix the pit lid.

  In particular, when attaching the fixing member to the lid body with screws or bolts, it is possible to adjust the position of the fixing member by making the insertion holes for the screws and bolts provided in the attachment portion of the fixing member long. It is not necessary to attach the member precisely, and it can be adjusted as appropriate according to the pit width at the site, and the work becomes easy. Further, when the fixing member is made of stainless steel, the corrosion resistance is excellent, so that the durability can be significantly improved in combination with the aluminum lid body.

Sectional drawing of the cable pit which equipped with the pit cover concerning this invention. The partially expanded sectional view of FIG. The perspective view of the pit cover main body which concerns on this invention. The perspective view of the fixing member which concerns on this invention. The partially expanded sectional view of FIG. 1 in another Example.

  Hereinafter, the present invention will be described in detail based on embodiments of the drawings. As shown in FIG. 1, the cable pit A has left and right side walls A1 and a bottom wall A2, and has a substantially U-shaped cross section with an upper surface opened. After the cable is laid, the upper surface opening is closed with a pit lid 1. .

  As shown in FIG. 2, the pit lid 1 includes a lid body 2 and a fixing member 7 attached to the back surface thereof. The lid body 2 has a plurality of reinforcing ribs 4 in the space portion 3 as shown in FIG. A hollow body having a rectangular parallelepiped shape, which is formed by extruding an aluminum alloy. A plurality of protrusions 5 for preventing slipping are provided on the surface, and are fixed to the openings at both ends by pressing plates 6. It is closed. In this embodiment, an angle (not shown) is screwed to the pressing plate 6 and the angle is inserted into the space 3 and fixed, but it may be fixed with a screw or the like. Further, the pit lid 1 is provided with a rigid body such that both end opening sides of the lid body 2 are placed on both side walls A1 and A1 of the pit, and the reinforcing rib 4 bridges the side walls A1 and A1.

As shown in FIG. 4, the fixing member 7 includes an attachment portion 8 for attachment to the back surface of the lid body 2, an intermediate portion 9 hanging from one end of the attachment portion 8, and a lower end of the intermediate portion 9 from the lower end toward the pit side wall A1. The lower end portion is bent inward of the locking portion 10 to form the refracting portion 11. These are flat plates having elasticity, and are integrally formed by bending a belt-shaped stainless steel.

As shown in FIG. 1, the fixing members 7 are paired so as to face the left and right sides of the back surface of the lid body 2, that is, the respective pit side walls when the pit lid is mounted. In addition to the arrangement in the front-rear direction, the interval between the intermediate portions 9 and 9 of the pair of fixing members 7 and 7 is made smaller than the pit width, and the interval between the top portions 10a and 10a of the locking portions 10 and 10 is made larger than the pit width. Thus, when the cable pit A is mounted, the top portion 10a of the locking portion 10 comes into contact with and presses the inner walls of the pit side walls A1 and A1.

Further, the fixing member 7 is provided with a pair of long holes 12 in the attachment portion 8, and is attached to the lid body 2 through the long holes 12 by a tapping screw (not shown). Thus, since it is screwed through the long hole 12, the position of the fixing member 7 can be adjusted. In addition, a female screw hole may be provided on the back surface of the lid body 2 and screwed with a normal screw.

Since the pit cover 1 of the present invention has the above-described configuration, when the fixing member 7 is inserted into the cable pit A when the cable pit A is covered with the pit cover 1, the inclined surface of the fixing member 7 at the lower portion of the locking portion 10. Comes into contact with the inner end of the upper surface of the cable pit A, and the pit lid 1 is positioned. Next, when pressing from the upper part of the pit lid 1, the intermediate part 9 and the locking part 10 of the fixing member 7 are elastically displaced inward, and the top part 10a of the locking part 10 is formed on the side wall A1 of the cable pit. The lower surface of the lid body 1 descends while sliding on the inner surface, the upper surface of the cable pit A comes into contact with the upper end of the cable pit A, and the opening of the cable pit is closed. At this time, the top portion 10a of the locking portion 10 is securely fixed to the cable pit A by pressing the cable pit side wall A1 by the restoring force of the elastic body.

In the above embodiment, the fixing member 7 is screwed to the pit lid 2 with screws, but may be attached to the lid body 1 with bolts 13 as shown in FIG. In this case, a bolt insertion hole is provided in the attachment portion 8 of the fixing member 7, and a bolt insertion hole penetrating vertically is also provided in the lid body 2, and the bolt 13 is inserted from the surface of the lid body 2 or the attachment portion 8 of the fixing member 7. The fixing member 7 can be attached to the pit lid 8 by screwing the nut 14 into the bolt end. At this time, if the bolt insertion hole of the attachment portion 8 of the lid main body 2 and / or the fixing member 7 is a long hole, the bolt 13 or the nut 14 is loosened when the pit lid is removed, thereby elastically moving to the side wall A1 of the cable pit. Since the fixing member 7 that is pressed to the inside moves inward through the attachment portion 8 and / or the long hole of the lid body 2 due to its elasticity, it can be easily removed even if it is firmly fixed. .

In the above embodiment, the fixing member is attached to the lid main body with a screw or a bolt, but it can also be performed with an adhering means such as adhesive bonding or brazing. Further, the surface of the lid body may be anodized, and a coating such as acrylic melamine coating may be formed to improve rust prevention and weather resistance.

The fixing member in the present invention may be any material as long as it can be elastically deformed without causing plastic deformation when the fixing member is inserted into the cable pit. Carbon steel or the like can be used, but stainless steel is desirable from the viewpoint of corrosion resistance and durability. Further, as the aluminum constituting the lid main body, any of pure aluminum, a processing alloy such as Al—Si, and the like can be used.

DESCRIPTION OF SYMBOLS 1 ... Pit cover 2 ... Cover body 3 ... Space part 4 ... Reinforcement rib 5 ... Projection 6 ... Holding plate 7 ... Fixing member 8 ... Mounting part 9 ... Intermediate part 10 ... Locking part 10a ... Top part 11 ... Bending part 12 ... Long hole 13 ... Bolt 14 ... Nut A ... Cable pit A1 ... Side wall A2 ... Bottom wall

Claims (4)

A pit cover for closing an opening of a cable pit, the pit cover being attached to a cover body made of a hollow body made of aluminum and a back surface of the cover body, and elastically attached to inner surfaces of both side walls of the cable pit. The fixing member includes at least a pair of fixing members that are in contact with each other, and the fixing member is formed of an elastic plate-like body, and is attached to a back surface of the lid body, an intermediate portion depending from one end of the attachment portion, and the intermediate A pit lid comprising: an engaging portion that bends in a mountain shape from the lower end of the portion toward the pit side wall, and has a top portion that comes into contact with the inner surfaces of both side walls of the cable pit. The pit cover according to claim 1, wherein the attachment portion has a long hole, and is attached to the lid main body with a screw or a bolt through the long hole.   3. The pit cover according to claim 1, wherein the fixing member is formed by bending a belt-shaped elastic body to integrate the attachment portion, the intermediate portion, and the contact portion.   The pit cover according to any one of claims 1 to 3, wherein the fixing member is made of stainless steel.

Images