JP4080441B2 - Jig for circular cutting of pavement surface - Google Patents

Description

  The present invention relates to a jig for an operation of cutting a pavement surface around an iron lid for an underground structure into a circle.

  As a device that cuts the road surface paved with asphalt or concrete into a circle, there are devices called round hole cutters, round hole cutting cutters, etc., for the purpose of peeling the pavement surface around the iron cover for underground structures in use. In order to cut or cut the pavement surface into a circular shape with this type of cutter, it is necessary to drive a pin or the like as a shaft into the road surface as in the case of a compass. There are inventions such as 2001-295216 and JP-A-7-279118. In these inventions, when the pin is driven into the center position, the work is not easy if the pavement surface is hard, or when applied to the pavement surface around the manhole, the pin cannot be driven into the iron lid, so it cannot be applied as it is. There is.

On the other hand, Japanese Utility Model Publication No. 62-159509 discloses a circular cutting device in which a ring-shaped traveling path surrounding an obstacle is provided, and a blade is attached to a wheeled arm that can travel there. If applied to the iron lid, it is not necessary to drive the pin into the iron lid. However, it is not so easy to install a ring-shaped traveling path around the manhole, and centering is particularly difficult. When the work is performed without being centered, it becomes a non-circular cut portion that is not concentric, and the appearance is uncomfortable, and the amount of pavement material to be refilled is uneven depending on the direction, which adversely affects the finished quality.

  In some cases, instead of driving pins onto the iron lid, a separately manufactured centering jig is fixed to the iron lid with adhesive tape. However, in this case, the force to fix the centering jig is inevitably inadequate, and misalignment is likely to occur. When misalignment occurs during work, the cutting start position and end position do not match, and circular cutting is achieved. The problem of not being able to occur.

JP 2002-30608 JP 2001-295216 A JP 7-279118 A Japanese Utility Model Sho 62-159509

  The present invention has been made paying attention to the above points, and its object is to provide a circular pavement cutting jig that can be easily centered and does not cause misalignment. . Another object of the present invention is to provide a circular cutting jig that can be applied to a plurality of types of iron lids for underground structures.

In order to solve the above problems, the present invention provides a jig for the work of cutting the pavement surface around the iron cover for an underground structure into a circle, and has the same shape and size as the cover of the iron cover for an underground structure. It has a jig body that can be replaced with a lid, and the jig body can be used as an iron lid for an underground structure having a single lid and an iron lid for an underground structure having a parent-child lid. There is a first engaging portion consisting of a concave or convex portion provided at the center of a circle drawn around the iron lid for an underground structure having a single lid, and an iron for an underground structure having a parent-child lid assumed to be both of an second engagement portions consisting of concave portions or convex portions are provided at the center and a position of the parent lid in a jig body having a child lid and same shape and size and substitutable form of lid This is a measure taken.

  In the present invention, the iron lid for an underground structure is a device as a means for approaching or going in and out of the underground structure, represented by a so-called manhole or hand hole, Including the receiving frame. The present invention is directed to a jig for cutting a paved surface into a circular shape for such an iron lid for an underground structure, and provides a center of circular motion for circular cutting.

The jig | tool for circular cutting | disconnection of this invention has a jig | tool main body same shape and the same size as the cover body of the iron cover for underground structures. Therefore, since the jig body can be replaced with the lid of the iron lid, it can be fitted to the receiving frame instead of the lid removed from the receiving frame. The jig body must be stable when fitted to the receiving frame, and cannot be detached from the receiving frame while performing a circular motion with a work machine such as a cutter attached.

  It is desirable that such a jig body not only has the same shape and size as the lid, but also has an equivalent structure. The iron cover for underground structures is stipulated in Japanese Industrial Standards (for example, JIS A 5506 etc.), but within the scope of the standard, each company produces products with various characteristics. Even if the apertures are the same, the iron lids for company A and the iron lids for company B and company C are not necessarily completely compatible with each other. However, the types of basic structures for fitting the lid to the receiving frame are limited, and therefore several types of jig bodies suitable for lids having several typical structural forms are prepared. Therefore, at least a manhole in Japan can be handled with the jig of the present invention.

  A first engagement portion formed of a concave portion or a convex portion is provided at a position on the jig body corresponding to the center of a circle to be drawn around the iron lid for the underground structure. In the case where the iron lid for an underground structure is composed of a single lid and a receiving frame, the position of the first engagement portion coincides with the center of the receiving frame when fitted to the receiving frame. This coincidence makes it possible to make a circular cut consisting of concentric circles centered on the iron lid for the underground structure. The first engaging portion is a portion to which a central axis of a work machine such as a cutter is attached, and therefore takes the form of a concave portion or a convex portion. The concave portion includes a concave portion or a through hole, and the convex portion includes a shaft such as a bolt that passes through the through hole of the protruding portion or the concave portion.

  The present invention can also be applied to so-called parent-child iron covers for underground structures. This type of iron lid has a structure in which, for example, a standard-diameter child lid is provided on a large-diameter master lid, and the parent lid is normally bolted to a receiving frame to open and close the child lid. Therefore, when the main lid is 900φ and the sub lid is 600φ, the center of the main lid is located on the sub lid. In such a case, a jig body having the same shape and size as the sub lid is required. A second engaging part similar to the first engaging part is provided on the jig main body that is prepared and located at a position that coincides with the center of the parent lid. Therefore, the first engaging portion is at the center of the jig body, while the second engaging portion is at an eccentric position.

  For this reason, it is also possible to provide the first engaging portion and the second engaging portion together in one jig body. That is, the jig body can be used as an iron lid for an underground structure having a single lid, an iron lid for an underground structure having a parent-child lid, and an iron lid for an underground structure having a parent-child lid, You may have both the 1st engagement part for the iron cover for underground structures which has a single cover, and the 2nd engagement part for the iron cover for underground structures which has a parent-child cover.

  In this way, the jig body is fitted into the receiving frame of the iron lid for underground structures, or fitted into the child lid receptacle of the parent and child lid, and the paving surface is rounded by a work machine such as a round hole cutter. Functions as a jig for cutting. Therefore, the jig body can be provided with a latching portion used for mounting the jig body. As the latching part, for example, for releasing the taper fitting, for releasing the locking device, a substantially U-shaped prying hole provided at three positions on the periphery of the jig body, a tool key, etc. This corresponds to the keyhole. The structural form unique to the lid of each company can also be applied to the latching portion, but it should be considered carefully because it may be subject to patent rights.

  Since the present invention is configured and operates as described above, the center of the iron cover for the underground structure is brought out by fitting the jig body to the receiving frame or the child lid receiving port of the main lid. Therefore, it is possible to perform an accurate circular cutting work by the working device, and there is a remarkable effect that it can be applied to a plurality of types of iron covers for underground structures.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is an example 1 regarding an iron lid for an underground structure having a single lid body 11. When the lid body 11 is fitted to a receiving frame 13, the lid body 11 is surrounded by the circumferential surface 12 of the inner circumferential surface of the receiving frame 13. 14 has a structure to be taper-fitted. However, this structure form is only an example, and is not essential to the present invention. As already described, it can take a simple lid type or other various structure forms.

  The jig body 15 has the same shape and size as the lid body 11 and the same type of structure. Reference numeral 16 denotes a main body peripheral surface, which is taper-fitted to the inner peripheral surface 14 of the receiving frame 13. When the same or higher identity as the lid body 11 is fitted to the receiving frame 13, the jig main body 16 is fitted. The stability of 15 can be increased. The material of the jig body 15 may or may not be the same as that of the lid body 11. For example, the weight of the jig body 15 is reduced by using aluminum alloy, plastic, or wood. Since the jig body 15 of Example 1 corresponds to a circular iron lid, a first engagement portion 17 is provided at the center of the circle. The illustrated first engaging portion 17 is shown as a hole penetrating the front and back of a disk-shaped member.

  On the other hand, in the case of the iron lid for an underground structure having the parent-child lid structure shown in FIG. 3, the jig body 25 has the same shape and the same size as the child lid and can be replaced. In FIG. 3, 21 is a main lid, 23 is a receiving frame, 24 is a sub lid receiving port, and 26 is a peripheral surface of the main lid. The jig body 25 of Example 2 is fitted to the child lid receptacle 24 of the parent lid 21 while maintaining a certain positional relationship, and the center position of the parent lid 21 in the correct fitting state. A second engaging portion 27 is provided in the jig body 25.

  The jig bodies 15 and 25 of Examples 1 and 2 can be used both as an iron lid for an underground structure having a single lid 11 and a child lid for an iron lid for an underground structure having a parent-child lid structure. Accordingly, the first engaging portion 17 and the second engaging portion 27 are provided on the same plate surface. Needless to say, the first engagement portion 17 is located at the center of the circular jig bodies 15 and 25, and the second engagement portion 27 is displaced from the center of the same jig bodies 15 and 25. In an eccentric position.

In addition, the jig bodies 15 and 25 of Examples 1 and 2 include U-shaped recessed portions 18 and 28 provided at three positions on the periphery at equal intervals, tool insertion ports 19 and 29, a key hole for a locking device, and the like. Is provided. Among these, the U-shaped recessed portions 18 and 28 are used for releasing the taper fitting of the jig bodies 15 and 25. FIG. 4 is an illustration of the work. The lid 11 is removed from the receiving frame 13 and replaced with the jig body 15, and the shaft pin 31 is inserted into the first engaging portion 17. The work machine 30 attached in this way performs a circular motion with the first engagement portion 17 as the center of rotation. Reference numeral 33 indicates a circular cutting line, and 34 indicates a cutting line. Thus, a circular cutting operation is performed by the cutter blade 35 of the work machine 30 around the shaft pin 31 attached to the construction jig of the present invention, and the cutting line 34 accurately coincides with the beginning and the end. The above is an example of a case having a single lid body 11, but even when it has a parent-child lid structure, the operation can proceed in the same procedure as above except that the shaft pin 31 is inserted into the second engagement portion 27. Thus, it is possible to accurately perform the circular cutting along the circular cutting planned line. The shaft pin 31 may be attached to the work machine 30 (FIG. 5), or may be attached to the jig bodies 15 and 25 (FIG. 4).

The perspective view which shows Example 1 of the jig | tool for circular cutting of the pavement surface which concerns on this invention. The top view for demonstrating the cutting | disconnection circle | round | yen by the thing same as the above. The top view for demonstrating Example 2 of this invention. The perspective view which shows the circular cutting construction of the pavement surface by this invention. Sectional drawing same as the above.

Explanation of symbols

11 Lid 13, 23 Receiving frame 15, 25 Jig body 17 First engagement portion 18, 28 Recessed portion as latching portion 21 Parent lid 24 Child lid receptacle 27 Second engagement portion 30 Work machine 31 Axle pin 33 Circular Scheduled cutting line 34 Circular cutting line 35 Cutter blade

Claims (2)

It is a jig for cutting the pavement surface around the iron cover for underground structures into a circle, and has the same shape and size as the cover of the iron cover for underground structures and can be replaced with the cover A jig body is provided, and the jig body can be used both as an iron lid for an underground structure having a single lid and an iron lid for an underground structure having a parent-child lid, and has a single lid. A first engaging portion composed of a concave portion or a convex portion provided at the center of a circle drawn around the iron lid for the underground structure, and the same size and size as the child lid of the iron lid for the underground structure having a parent- child lid A collar iron cover for an underground structure characterized in that it has a second engaging portion consisting of a concave portion or a convex portion provided at a position which becomes the center of the main lid in a jig body having a replaceable form. . The collar iron cover for underground structures according to claim 1, wherein the jig body has a latching portion used for mounting a work machine such as a cutter.

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