JP2004011244A - Fixed structure of lid of underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed structure of an underground structure which does not get loose even if a bolt fixing the lid to a frame oscillates due to comings and goings of vehicles and people and in which rainwater or the like does not intrude. <P>SOLUTION: A protrusion 2a having a bolt hole 3 is formed in a shelf 2 of a frame 1 and bolt hole 5 is formed to face a hole 3 of the projection 2a of the frame 1 in the lid 4 also. The upper part of the hole 5 is shaped to have a widened hole 6. A protruded recess is formed in the widened hole 6. A right polygonal bolt 7 in the head is inserted in holes 3, 5. The inside face of the ring is so serrated that the same radius with a radius extending from the center of the head 8 of the bolt 7 to the corner and a shorter radius than that are alternnately arranged. A stopper 9 in which a protrusion 11 which can insert in a protruded recess of the widened hole 6 is provided is fitted to the head 8 of the bolt 7 and the protrusion 11 is inserted in the protruded recess 12 and further, a rubber cap 10 is fitted to the upper part of the head 8 of the stopper 9 and the bolt 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a cab system, a manhole for collecting or draining water, and a fixing structure for a lid of an underground structure such as a storage box for a water or gas meter.
[0002]
[Prior art]
In the conventional underground structure, holes are provided in the lid receiving shelf on the inner surface of the opening edge of the frame of the underground structure and the corresponding edge of the lid, bolts are inserted, and nuts are tightened and fixed.
[0003]
[Problems to be solved by the invention]
In the above-mentioned fixing of the frame and the lid of the conventional underground structure, the bolts are rotated by the vibration of the lid, the bolts loosen, the nuts fall off, There is a risk that the lid may be opened due to the occurrence of the bolt, or the lid may be opened by pulling out the bolt without using a tool due to mischief or the like.
In addition, rainwater or dirt enters the gap between the bolt and the inner wall of the hole of the lid, and the bolt is corroded. And the bolt may come loose and the lid may come off.
[0004]
It is an object of the present invention to provide an underground structure fixing structure in which bolts for fixing a lid to a frame do not loosen even when the lid vibrates due to traffic of a car, a person, or the like, and in which rainwater or the like does not enter.
[0005]
[Means for Solving the Problems]
A plurality of protrusions provided on the shelf on the inner wall of the frame of the underground structure are provided with holes for inserting bolts, and the periphery of the lid is provided with holes for inserting bolts corresponding to the holes of the protrusions on the shelf. In the upper part of the hole, a projecting concave portion having a further enlarged diameter is provided continuously at the periphery of the enlarged diameter concave portion and the enlarged diameter concave portion,
Insert a bolt having a regular polygonal head into the bolt hole of the protrusion of the shelf and the bolt hole of the lid,
A ring shape that can be inserted into the enlarged diameter concave portion of the lid, and the inner surface of the ring has a saw-tooth shape in which a radius substantially equal to a radius from the center of the head of the bolt to a corner (a corner) and a short radius are alternately arranged. A stopper for preventing rotation of the bolt, which is provided on the outer periphery with a protruding portion which can be inserted with a margin into a protruding concave portion continuous with the enlarged diameter concave portion of the lid, is fitted to the head of the bolt, and Insert the ring portion into the enlarged diameter concave portion of the lid, and insert the protrusion of the stopper into the projected concave portion continuous with the enlarged diameter concave portion,
A rubber cap having a shape capable of fitting in the enlarged diameter concave portion and the projected concave portion above the stopper and the head of the bolt is fitted in the enlarged diameter concave portion and the projected concave portion.
[0006]
It is preferable to provide one or two symmetrically protruding concave portions that are further enlarged in diameter continuously to the periphery of the large diameter concave portion of the lid, and to provide one or two symmetrically protruding portions of the stopper.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
The fixing structure of the lid of the underground structure according to the present invention is provided at a plurality of places, preferably four places, on the inner wall of the inner surface wall of the frame 1 of the underground structure, preferably at four places, toward the center of the frame 1. Bolt insertion provided at a position corresponding to the hole 3 of the protrusion 2a of the shelf 2 at the periphery of the cover 2 and the hole 3 for inserting a bolt provided at each of the protrusion 2a and the cover 2 5, an enlarged-diameter concave portion 6 provided on the upper portion of the hole 5, a rectangular bolt 7 having a regular head 8 for inserting the hole 3 and the hole 5, and a head of the bolt 7 It comprises a stopper 9 for preventing the rotation of the bolt 7 having an inner hole into which the part 8 is fitted, and a rubber cap 10 for closing the enlarged-diameter recess 6 above the head 8 of the bolt 7.
[0008]
As shown in FIG. 3 (C), the inner diameter of the stopper 9 is substantially the same as the radius r from the center of the head 8 of the bolt 7 to the corner (corner), and the radius is alternately shorter than the radius r. A serrated inner wall is formed, and one projection 11 is provided on the outer periphery.
[0009]
The large-diameter concave portion 6 of the hole 5 of the lid 4 has a shape in which the stopper 9 can be inserted with a margin. As shown in FIG. 4, a circular concave portion into which the ring-shaped portion of the stopper 9 can be inserted, and a circular concave portion The projecting recesses 12, 12 for inserting the projecting portions 11 of the ring 9 whose diameters are increased are symmetrically connected. The number of the projecting recess 12 may be one.
As will be described later, the projecting concave portion 12 having an enlarged diameter has a sufficient size so that the projecting portion 11 of the stopper 9 can be accommodated even if the direction of the corner of the head 8 of the bolt 7 when the bolt 7 is tightened is slightly changed. I do.
[0010]
As shown in FIG. 3 (A), the rubber cap 10 is shaped so as to fit into the enlarged-diameter concave portion 6 of the lid 4, and is provided on the outer periphery of the disk-shaped main body at the outer diameter of the enlarged-diameter concave portion 6. Are provided symmetrically with each other. When the protrusion concave portion 12 is provided at one position, the protrusion 14 is also provided at one position.
It is preferable that a hole 13 is provided on the inner wall surface of the enlarged diameter concave portion 6, and a protrusion 15 for retaining is provided on the outer wall surface of the rubber cap 10 so that the protrusion 15 can be fitted into the hole 13.
[0011]
Holes 16, 16 into which the bolts 7 can be inserted are provided on both sides of the holes 3 of the protrusion 2 a of the shelf 2 of the frame 1, and holes 17, 17 corresponding to the holes 16, and bolts 7 corresponding to the holes 3 are formed. A washer 19 provided with an insertion screw hole 18 is abutted, a bolt 20 is inserted into the holes 16 and 17, and a nut 21 is tightened to fix the washer 19.
[0012]
The fixing of the frame 1 and the lid 4 is performed as follows.
That is, after the lid 4 is placed on the shelf 2 of the frame 1, the washer 22 is placed on the enlarged diameter concave portion 6 of the lid 4, and the hole, the hole 5 in the enlarged diameter concave portion 6, and the protrusion 2 a of the shelf 2 are formed. The bolt 7 is inserted into the hole 3, the bolt 7 is rotated, and the screw portion at the tip of the bolt 7 is screwed into the screw hole 18 of the washer 19 fixed to the lower surface of the protrusion 2 a of the shelf 2. The frame 1 and the lid 4 are fixed with bolts 7.
[0013]
Next, the stopper 9 is fitted to the head 8 of the bolt 7 with the protrusion 11 inserted into the protrusion 12 of the enlarged diameter recess 6.
At this time, the corner of the head 8 is fitted to the larger radius r of the serrated inner surface of the stopper 9.
[0014]
In this case, the relationship between the enlarged diameter concave portion 6 of the lid 4, the stopper 9, and the head 8 of the bolt 7 will be described with reference to FIG.
In FIG. 5, the head 8 of the bolt 7 is a regular hexagon. Let X be an axis passing through the center O of the enlarged diameter concave portion 6 and the centers of the projecting recesses 12, 12, and let Y be an axis passing through the center O of the stopper 9 and the center of the protrusion 11.
[0015]
The two sides of the head 8 of the bolt 7 that are opposed to each other are not always perpendicular to the axis X of the enlarged-diameter recess 6 depending on the degree of tightening of the bolt 7.
FIG. 5A shows a case where two opposing sides of the head 8 are perpendicular to the axis X, and the axis X and the axis Y coincide with each other. FIG. Is a state perpendicular to the axis X, and the axis Y is deviated to the right by 10 degrees in the figure.
[0016]
In the above examples (A) and (B), the two opposite sides of the head 8 are perpendicular to the axis Y of the stopper 9 and the stopper 9 is fitted to the head 8, but the inner wall surface of the stopper 9 has a saw tooth. The stopper 9 can be fitted to the head 8 at a non-perpendicular angle by selecting a saw tooth, that is, by shifting the saw tooth, as shown in FIG. That is, the fitting can be performed without being aware of the fitting state of the head 8 and the stopper 9.
However, in this case, it is assumed that the stopper 9 is fitted to the head 8 in a state where the protrusion 11 of the stopper 9 is accommodated in the protrusion 12 of the enlarged diameter recess 6.
(C) shows a case where the axis Y is shifted to the left by 10 degrees in the figure.
That is, (B) and (C) show that the projection 11 of the stopper 9 is in a state where the axis X and the axis Y intersect within the side wall width of the projection recess 12.
[0017]
After the lid 4 is fixed to the frame 1 with the bolts 7 and the stoppers 9, the rubber cap 10 is fitted into the enlarged diameter concave portion 6 and the projected concave portion 12.
At this time, the protrusion 15 of the outer peripheral wall of the rubber cap 10 is elastically fitted into the hole 13 of the inner wall of the enlarged diameter concave portion 6, and after the rubber cap 10 is fitted, the projection 15 is prevented from coming off unless the rubber cap 10 is pulled up by a strong force.
[0018]
The rubber cap 10 fitted in the enlarged diameter concave portion 6 and the protruded concave portion 12 prevents infiltration of rainwater or the like, but in order to further ensure waterproofness, when the bolt 7 is inserted into the hole 5 of the lid 4, It is preferable to provide one or a plurality of ring grooves on the outer peripheral surface of the bolt 7 that abuts on the inner wall surface and fit the O-ring 23 therein.
[0019]
It is preferable to provide a ring groove in the inner wall of the frame 1 or the surface of the shelf 2 and to fit an O-ring 24 or a ring-shaped packing 25 to waterproof.
[0020]
In the fixing of the frame 1 and the lid 4 by the present fixing structure, even if the lid vibrates due to traffic of a car or a person and the bolt 7 is about to rotate, the projection 11 of the stopper 9 fitted to the head 8 is fixed to the lid 4. Abuts against the side wall of the projecting recess 12 of the enlarged diameter recess 6 and does not rotate any further.
Therefore, the width of the concave portion 12 of the enlarged diameter concave portion 6 of the lid 4 is set to be larger than the width of the protrusion 11 of the stock 9, but the difference is not so large, and the crossing angle between the X axis and the Y axis is set to about 20. It is preferable to set it within the degree.
[0021]
Although the stopper 9 is provided with one protrusion 11, a stopper 9 a provided with two protrusions 11 symmetrically as shown in FIG. 6 may be used.
In this case, as the enlarged diameter concave portion 6 of the lid 4, the one in which two projecting concave portions 12 of the above embodiment are provided symmetrically is used.
[0022]
When the stopper 9a is used, the rubber cap may be the rubber cap 10 provided with two protrusions 14 of the above embodiment.
However, when one protrusion 11 is provided like the stopper 9, the protrusion 14 uses two rubber caps 10, or as shown in FIG. Although the rubber cap 10a is used, when the protrusion 14 uses one rubber cap 10a, a lid provided with one concave portion 12 in the enlarged diameter concave portion 6 is used.
[0023]
When the stopper 9 or 9a is to be removed from the enlarged diameter concave portion 6 and the protruding concave portion 12 of the lid 4, the fingertip enters the protruding concave portion 12 to easily pull up the protruding portion of the stopper 9 or 9a, as shown in FIGS. As described above, it is preferable that the length of both or any one of the protruding concave portions 12 and 12 in the X-axis is increased so that the fingertip can be inserted. In this case, the rubber cap has a shape corresponding to the shapes of the enlarged diameter concave portion 6 and the protruded concave portion 12.
In order to make it easier to remove the rubber cap 10 or 10a from the enlarged diameter concave portion 6 and the protruding portion 12, it is preferable to provide a notch 26 at the upper edge corner of the protrusion 14 of the rubber cap. When removing the rubber cap 10 or 10a, insert a fingertip or a tip of a dry paper into the notch 26, pry up and remove the rubber cap 10 or 10a.
[0024]
【The invention's effect】
According to the present invention, the bolts for fixing the lid to the frame are not loosened even if the lid vibrates due to traffic of a car, a person or the like, and the bolt does not corrode due to rainwater or the like penetrating. The state is maintained.
[Brief description of the drawings]
FIG. 1 is an explanatory side sectional view of a fixing structure of a frame and a lid of an underground structure according to the present invention.
FIG. 2 is an explanatory front sectional view of a fixing structure of a frame and a lid of an underground structure according to the present invention.
FIG. 3 is a perspective view of a rubber cap, a stopper, and a bolt used for a fixing structure.
FIG. 4 is a perspective view of a main part of an edge portion of a lid having an enlarged-diameter concave portion and a protruded concave portion at an edge portion.
FIG. 5 is an explanatory diagram of a fitting state of a rubber cap, a stopper, and a bolt used for a fixing structure.
FIG. 6 is a perspective view of a stopper according to another embodiment.
FIG. 7 is a perspective view of a rubber cap according to another embodiment.
FIG. 8 is an explanatory diagram of a fitting state of a rubber cap, a stopper, and a bolt used in a fixing structure according to another embodiment.
[Explanation of symbols]
1 Frame 2 Shelf 3 Hole 4 Cover 5 Hole 6 Enlarged recess 7 Bolt 8 Head 9 Stopper 10 Rubber cap 11 Projection 12 Projection recess 13 Projection edge 14 Projection 15 Projection 16 Hole 17 Hole 18 Screw hole 19 Washer 20 Bolt 21 Nut 22 Washer 23 O-ring 24 O-ring 25 Ring-shaped packing 26 Notch

Claims (2)

A plurality of protrusions provided on the shelf on the inner wall of the frame of the underground structure are provided with holes for bolt insertion,
A hole for inserting a bolt corresponding to the hole of the protrusion of the shelf is provided at a peripheral portion of the lid, and an enlarged-diameter concave portion is provided at an upper portion of the hole, and a protruded concave portion further enlarged in diameter is continuous with the periphery of the enlarged-diameter concave portion. ,
Insert a bolt having a regular polygonal head into the bolt hole of the protrusion of the shelf and the bolt hole of the lid,
A ring shape that can be inserted into the enlarged diameter concave portion of the lid, and the inner surface of the ring has a saw-tooth shape in which a radius substantially equal to a radius from the center of the head of the bolt to a corner (a corner) and a short radius are alternately arranged. A stopper for preventing rotation of the bolt, which is provided on the outer periphery with a protruding portion which can be inserted with a margin into a protruding concave portion continuous with the enlarged diameter concave portion of the lid, is fitted to the head of the bolt, and Insert the ring portion into the enlarged diameter concave portion of the lid, and insert the protrusion of the stopper into the projected concave portion continuous with the enlarged diameter concave portion,
A rubber cap having a shape capable of fitting into the enlarged-diameter concave portion and the projected concave portion above the stopper and the head of the bolt is fitted to the enlarged-diameter concave portion and the projected concave portion,
Underground structure lid fixing structure. Protrusion recesses whose diameters are further increased continuously at the periphery of the enlarged diameter recesses of the lid are provided at one or two locations symmetrically, and the protrusions of the stopper are provided at one location or two locations symmetrically. The fixing structure for a lid of an underground structure according to claim 1, wherein:

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