JPH0223643Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hand grip for an underground structure frame provided at an entrance to an underground structure such as a manhole.

[Conventional technology]

Conventionally, such hand grips have been fixed to frames for underground structures by providing a screw groove at the tip of the base of the hand grip, inserting this groove into the frame through an insertion hole provided in the frame, and fixing it directly with a nut, or by welding. A method of twisting and fixing is used.

[Problem that the invention attempts to solve]

However, by mounting using this method, a stable fixed state cannot be obtained. That is, since the load is concentrated on the fixed portion, there is a risk that the handle may become loose during use over a long period of time, or that the hand grip itself may come off the frame during transportation.

The present invention was devised in view of these problems, and by stably fixing it to the frame for underground structures, it can withstand stable use over a long period of time.
It is an object of the present invention to provide a hand grip for a frame for an underground structure that can be easily installed.

[Means and actions for solving problems]

In order to achieve the above object, the present invention forms a recess for attaching the handgrip body with a downward opening in the lower part of the annular wall of the frame for underground structures, and has a gripping rod and a recessed portion bent from both ends of the gripping rod. A handgrip main body formed from a pair of non-parallel mounting rods is disposed in the recess, and a support plate is attached that presses the mounting rod from below to fix the handgrip main body in the recess. .

The support plate applies an upward force that presses the attachment rod of the handgrip body into the recess, and mechanically restrains the handgrip body against a downward load received from a person's hand. Therefore, the handgrip body is
Its posture is held in a predetermined position by the support plate without tilting downward. In addition, the mounting rods of the hand grip body are not parallel to each other, so
When a tensile force is applied to the handgrip body in the direction of the center of the frame, this mounting rod portion generates a component force in the circumferential direction of the frame against the recess for attaching the handgrip body and the support plate. Therefore, due to the reaction of this component force, the handgrip main body is restrained from moving toward the inside of the frame, thereby preventing the handgrip main body from falling off.

〔Example〕

Hereinafter, features of the present invention will be specifically explained with reference to embodiments shown in the drawings. This embodiment is an example in which the present invention is applied to a manhole frame.

FIG. 1 is a plan view of a manhole frame provided with a handgrip attachment portion, and FIG. 2 is a sectional view showing a handgrip main body attached to the manhole frame. Also, the third
Figures 5 to 5 show details of the handgrip and its attachment.

In Figures 1 and 2, manhole frame 1
is placed on a side block 2 of concrete or the like buried in the ground. The man-marl frame 1 also includes a vertical annular wall 3 and a horizontal annular flange 4 extending outward from the bottom of the annular wall 3. Then, this manhole frame 1 is inserted into the side block 2 by the anchor bolt inserted into the anchor bolt insertion hole 5.
Fixed.

A hand grip attachment portion 6 is provided at a suitable location on the annular flange portion 4 of the manhole frame 1. In this embodiment, the handgrip mounting portions 6 are provided at three locations spaced apart in the circumferential direction, but the number and position of the handgrip mounting portions 6 can be determined as appropriate.

3 to 5 show the detailed structure of this handgrip attachment part 6.

The handgrip attachment part 6 is formed at the lower part of the annular wall 3. A recess A for attaching the handgrip body formed inside the handgrip attachment part 6 includes an upper wall 7, an inner wall 8 on the annular wall 3 side, and an outer wall 9 provided at a distance from the inner wall 8 in the radial direction. and two walls 10, 10 spaced apart in the circumferential direction, and open downward. The recess A for attaching the handgrip main body is continuous with the horizontal annular flange 4 at this opening position.

As shown in FIGS. 3 and 4, the handgrip main body 12 is formed of a rod-shaped metal core body bent into a U-shape. The handgrip main body 12 includes a gripping rod 13 and a pair of attachment rods 14 extending from both ends of the gripping rod 13 in a direction in which their tips are separated from each other.
It consists of 14. That is, the mounting rod 1
4 and 14 are not parallel to each other, and the distance L between the distal ends is larger than the distance S between the base ends. Further, the gripping rod 13 of the handgrip main body 12 has its outer periphery covered with a synthetic resin coating.

The mounting rods 14, 14 of the handgrip main body 12 are disposed within the recess A for mounting the handgrip main body 12.
In this arrangement, the inner wall 8 on the annular wall 3 side
Insertion grooves 15, 1 of the lower surface opening provided at required intervals in the
5, the proximal ends of the mounting rods 14, 14 are fitted from below. The distance between the fitting grooves 15, 15 is determined according to the width and angle of the mounting rods 14, 14 of the handgrip main body 12, which are in a non-parallel state. For example, as shown in FIG. 3, the distance between the mounting rods 14 is smaller than the distance L at the tip end, but larger than the distance S at the base end.

Further, it is preferable that the axes and diameters of the fitting grooves 15, 15 are approximately equal to the axes and diameters of the mounting rods 14, 14, respectively. Note that a guide flange 14a is provided on the part of the mounting rod 14 that fits into the fitting grooves 15, 15.
It is also possible to provide

Since the hand grip of this embodiment has such a structure, the mounting rods 14, 14 are once inserted into the fitting grooves 15,
15, movement in the radial direction is restricted by the fitting grooves 15, 15. Therefore, the recess A
By setting the insertion lengths of the attachment rods 14, 14 inserted into the manhole frame 1, the amount of protrusion of the gripping rod 13 to be projected into the interior of the manhole frame 1 can be determined according to the set value. Moreover, the mounting rod 14 is located in the recess A.
It also prevents it from falling out.

Further, a support plate 16 is disposed in the circumferential direction at the lower part of the recess A for attaching the handgrip body 12. The support plate 16 is provided with support grooves 17, 17 at locations corresponding to the insertion portions of the mounting rods 14, 14, as shown in FIGS. 6 and 7. Then, the mounting rods 14, 14 are attached to the support grooves 17, 17.
By fitting the insertion part of the mounting rod 14,
14 is supported.

Further, on the upper wall 7 of the handgrip attachment part 6, a third
As shown in FIGS. 4 and 5, bolt insertion holes 18, 18 through which connection bolts 19 are inserted are formed at intervals in the circumferential direction. On the other hand, as shown in FIG. 6, bolt insertion holes 20, 20 are also formed in the support plate 16 at locations that align with the bolt insertion holes 18, 18. Connection bolts 19, 19 are inserted through these bolt insertion holes 18, 18 and 20, 20. Nuts 21, 21 are screwed onto the tips of the connecting bolts 19, 19.

Therefore, when the connecting bolts 19, 19 are tightened,
As the support plate 16 rises in the direction of the upper wall 7, the mounting rods 14, 14 are strongly pressed and held by the support plate 16 and the upper wall 7. As a result, the mounting rods 14, 14 are held fixed.

Next, this hand grip body 12 is attached to the manhole frame 1.
This section explains the procedure for installing it.

First, the mounting rods 14, 14 of the handgrip body 12
are fitted into the fitting grooves 15, 15 from below of the handgrip mounting portion 6, as shown in FIGS. 3 and 4. A support plate 16 is disposed below the mounting rods 14, 14, and the mounting rods 14, 1 are inserted into support grooves 17, 17 provided on the upper surface of the support plate 16.
4. Support the insertion section. In this state, insert the connecting bolts 19, 19 into the bolt insertion holes 1 as shown in FIG.
8, 18 and 20, 20, and nuts 21, 21 are screwed onto the insertion ends thereof. Thereafter, the mounting rods 14, 14 are pressed and fixed to the upper wall 7 by further tightening the nuts 21, 21. This completes the work of attaching the handgrip main body 12.

In addition, in order to facilitate the screwing operation of the connecting bolts 19, 19 and to completely prevent loosening after tightening, spring washers or lock washers are attached to the connecting bolts 19, 19.
It is preferable to prevent rotation of 9 and 19.

In the embodiment described above, the recess A for attaching the handgrip body 12 is formed in the annular flange 4 extending radially from the lower part of the annular wall 3. but,
The location where the recessed portion A is formed is not limited to this. For example, in the case of a manhole frame 1 having a structure in which the annular flange portion 4 extends in the radial direction from the upper part of the annular wall 3, a special bracket for attaching the handgrip body 12 is provided protruding from the lower part of the annular wall 3, and It is also possible to form a recess A in the bracket.

In this way, in the present invention, the handgrip main body 12
The mounting recess A means any recess that is provided at the lower part of the annular wall 3, projects in the outer radial direction, and is open at the bottom, regardless of the form of the manhole frame 1.

In addition, the mounting rods 14, 1 in the above embodiment
4 are expanded in directions that separate them from each other. However, the mounting rods 14, 14 are not limited to this expanded state, and may be in any non-parallel state. For example, so that the distance between the tips of the mounting rods 14, 14 becomes narrower,
The mounting rods 14, 14 can also be bent.

Furthermore, the mounting rods 14, 14 of the handgrip main body 12 in the above embodiment are formed to have the same diameter over the entire length. However, the shape of the mounting rods 14, 14 is not limited to this. for example,
It is also possible to provide a flange at the tip to prevent it from coming off in case of an emergency.

[Effect of idea]

As explained above, in the hand grip of the frame for underground structures of the present invention, the support plate applies an upward force that presses the mounting rod of the hand grip body into the recess for attaching the hand grip body. , mechanically restrains the handgrip body against the downward load received from the human hand. Therefore, even if a load is applied, the handgrip body will not shift from the frame or tilt downward, and the handgrip can be firmly fixed and held on the underground structure.
Can be used stably for a long period of time.

Furthermore, since the mounting rods of the handgrip body are made non-parallel to each other, and these non-parallel parts are fixed in the recess for mounting the handgrip body, an acting force acts in the direction of pulling the handgrip body inward within the frame. Then, the mounting rod applies a component force in the circumferential direction of the frame. Therefore, due to the reaction of this component force in the circumferential direction of the frame, the mounting rod receives a restraining force directed outward against the frame, and this restraining force can prevent the handgrip main body from falling off from the frame. In addition, the hand grip used to safely move up and down inside the underground structure frame can be attached as a component during assembly if necessary, so it is secure without problems such as insufficient installation strength. It can be fixed in place and manufacturing is also easy.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a manhole frame provided with a hand grip attachment portion for an underground structure frame according to an embodiment of the present invention; Fig. 2 is a sectional view showing the hand grip main body attached to the manhole frame; Figure 3 is an enlarged plan view of the main parts showing the attached state of the handgrip body, Figure 4 is a sectional view taken along the line in Figure 3, Figure 5 is a sectional view taken along the line in Figure 3, and Figure 6 is a view of the support plate. Plan view,
FIG. 7 is a front view of the same. 1: Manhole frame, 2: Side mass, 3: Annular wall,
4: Annular flange portion, 5: Anchor bolt insertion hole, 6: Hand grip mounting portion, 7: Upper wall, 8: Inner wall, 9: Outer wall, 10: Wall, 12: Hand grip body, 1
3: Gripping rod, 14: Mounting rod, 14a: Guide flange, 15: Fitting groove, 16: Support plate, 17:
Support groove, 18: Bolt insertion hole, 19: Connection bolt, 20: Bolt insertion hole, 21: Nut, A: Recess.

Claims (1)

[Claims for Utility Model Registration] 1. A recess for attaching a handgrip body with a downward opening is formed in the lower part of the annular wall of the underground structure frame, and a gripping rod and a pair of non-parallel to each other bent from both ends of the gripping rod. A handgrip main body formed from a mounting rod is disposed in the recess, and a support plate is attached for pressing the mounting rod from below to fix the handgrip main body in the recess. Frame hand grip. 2. The recess for attaching the handgrip body and the support plate as set forth in claim 1 of the utility model registration claim respectively form a fitting groove and a mounting rod support groove that support the periphery of the mounting rod of the handgrip body. A hand grip for frames for underground structures featuring: 3. A handgrip for a frame for an underground structure, characterized in that the support plate according to claim 1 is fixed to a recess for attaching the handgrip main body by a connecting bolt.