JP2015203224A - Handrail for manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handrail for a manhole which does not require to modify the manhole and also can be easily handled.SOLUTION: A handrail for a manhole includes: an engaging part 22 engaged with a step 102 of a manhole 100; a contact part 23 in contact with an internal surface 101a of a hole body 101 in a state where the engaging part 22 is engaged with the step 102; a handrail part 21 extending upward in a state where the contact part 23 is contacted with the internal surface 101a of the hole body 101 while the engaging part 22 is engaged with the step 102; and a chain lever hoist 3 keeping the upright state of the handrail part 21 after pressurizing the contact part 23 onto the internal surface 101a of the hole body 101 by pulling up the handrail part 21 in a state where an eyebolt 33 is screwed into a bolthole 103 of the manhole 100 by connecting a first hook 31 with the handrail part 21.

Description

  The present invention relates to a handrail for a manhole for entering and exiting a manhole to the basement.

  For example, when maintaining and inspecting underground distribution lines, maintenance personnel enter and exit from the manhole. The manhole has an inner wall with a plurality of steps (legs) extending in the horizontal direction. However, since there is no handrail on the ground side, it becomes unstable when placing the foot on the top step, and the posture There is a risk of breaking your feet or removing your feet. For this reason, the handrail for manholes attached to a manhole is known (for example, refer patent document 1). This handrail for manholes has a handrail mounting bracket attached to the inner wall of the manhole, a handrail main body, an insertion portion inserted into the handrail mounting bracket, a horizontal portion extending from the insertion portion, and above the horizontal portion. And a handrail portion extending in the direction.

  In telephone / communication-related construction, a fence-like lifting tool that surrounds the entire circumference of the manhole on the ground side is used.

JP 2007-002481 A

  By the way, with the technique of patent document 1, a handrail attachment metal fitting must be attached to the inner wall of all the manholes, and a great expense and labor are required. In addition, lifting equipment used in telephone / communication construction is heavy and requires a lot of labor and personnel for transportation and installation. However, maintenance / inspection of underground distribution lines is usually performed by two maintenance personnel, and it is difficult for two maintenance personnel to transport and install lifting tools. Alternatively, it is necessary to increase the number of maintenance personnel in order to transport and install the lifting tool.

  Accordingly, an object of the present invention is to provide a handrail for a manhole that requires no manhole modification and is easy to handle.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a manhole in which a step extending in the horizontal direction is provided on the inner wall surface of the hole body, and a bolt hole for fixing a manhole cover is provided on the upper portion of the hole body. In addition, a handrail for manholes for entering and exiting, wherein the engaging portion engages with the step, and the abutting contact with the inner wall surface of the hole main body in a state where the engaging portion is engaged with the step. A handrail portion extending upward, and one end connected to the handrail portion with the engagement portion engaging the step and the contact portion contacting the inner wall surface of the hole body In the state where the other end portion is screwed into the bolt hole, the holding portion holds the upright state of the handrail portion by pulling the handrail portion and pressing the contact portion against the inner wall surface of the hole body. Means. .

  According to this invention, when the engaging part is engaged with the step and the contact part is brought into contact with the inner wall surface of the hole body, the handrail part extends upward. Then, when the other end portion of the holding means is screwed into the bolt hole and the handrail portion is pulled, the abutting portion is pressed against the inner wall surface of the hole body, and the handrail portion is held in an upright state. With the handrail for the manhole attached in this way, the user enters and exits the manhole with the handrail portion.

  According to a second aspect of the present invention, in the handrail for manholes according to the first aspect, the handrail portion is provided with a locked portion for locking one end portion of a safety lifting device worn by a person. It is characterized by.

  According to the first aspect of the present invention, it is possible to safely and easily enter and exit the manhole with the handrail portion in which the upright state is maintained. In addition, it is only necessary to engage the engaging part with the step, bring the abutting part into contact with the inner wall surface of the hole body, and draw the handrail part with the holding means, so that attachment and removal can be performed by one person. is there. In addition, it is merely provided with an engaging portion that engages with the step, an abutting portion that contacts the inner wall surface of the hole body, a handrail portion that extends upward, and a holding means that draws the handrail portion. Since it is not a large-scale thing surrounding the circumference, it can be reduced in size and weight, and can be easily transported and stored. In this way, handling is easy, and since existing steps and bolt holes are used, no manhole modification is required.

  According to the invention of claim 2, since the locked portion is provided in the handrail portion, a maintenance worker or the like wears a safety lifting device and locks one end thereof to the locked portion. A manhole handrail and a maintenance staff are connected to prevent the maintenance staff from falling.

It is a perspective view which shows the attachment state of the handrail for manholes concerning embodiment of this invention. It is the front view (a), side view (b), back view (c), and top view (d) which show the handrail main body of the handrail for manholes of FIG. It is a top view which shows the manhole which concerns on embodiment of this invention.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a perspective view showing an attached state of a manhole handrail 1 according to an embodiment of the present invention. The handrail 1 for manholes is a handrail for entering and exiting the manhole 100 to the basement, and includes a handrail main body 2 and two chain lever hoists (holding means) 3.

  Here, in this embodiment, as shown in FIG. 3, the manhole 100 is provided with a step (footrest) 102 extending in the horizontal direction on the inner wall surface 101 a of the circular hole-shaped hole main body 101. Bolt holes 103 are provided for fixing the manhole cover. That is, a stepped portion 101b that is lowered from the ground surface is provided on the upper portion of the hole body 101, and two bolt holes 103 are formed facing (in contrast to) the upper surface of the stepped portion 101b. Further, a step 102 is provided so as to protrude from the inner wall surface 101 a of the hole body 101 at a position between the two bolt holes 103. In other words, the step 102 is disposed so as to face a line (center line) connecting the two bolt holes 103.

  As shown in FIG. 2, the handrail main body 2 has a ladder shape as a whole, and mainly includes a handrail portion 21, an engagement portion 22, a contact portion 23, and a locked portion 24. .

  The handrail portion 21 has a substantially ladder shape, and a plurality of (four) horizontal portions 212 are provided between two vertically extending vertical portions 211, and each horizontal portion 212 is provided with a slip stopper. The handrail portion 21 is used as a handrail when a person enters and exits the manhole 100. As will be described later, the engagement portion 22 engages with the step 102 and the contact portion 23 is the hole. It extends vertically upward in contact with the inner wall surface 101 a of the main body 101. A semicircular half ring 25 is attached to the central portion of each vertical portion 211, and a first hook (one end) 31 of a chain lever hoist 3 described later can be connected to the half ring 25. ing.

  Here, the height of the handrail portion 21, that is, the height of the handrail main body 2 is set to the handrail portion 21 in a state where a manhole handrail 1 is installed and a person is standing as described later. It is set so that the user can easily enter and exit the manhole 100. Further, the width of the handrail portion 21, that is, the interval between the two vertical portions 211 is set so as to correspond to the manhole 100 having a plurality of diameters.

  The engaging portion 22 is a hook that engages with the step 102, and is disposed at the lower end portion of the handrail portion 21. That is, as shown in FIG. 2 (b), the lower part is a key shape (inverted L-shape) that is open, fixed to the front side of the lower end of each vertical part 211, and stepped by a connecting part 26 described later. Engage with step 102 in a state where 102 is sandwiched.

  The abutting portion 23 is a member that abuts against the inner wall surface 101 a of the hole body 101 in a state where the engaging portion 22 is engaged with the step 102. That is, a connecting portion 26 extending obliquely downward is disposed on the back side of the lower end portion of each vertical portion 211, and a bar-shaped contact portion 23 extending vertically is disposed on the lower end portion of the connecting portion 26. . Here, when the engaging portion 22 is engaged with the step 102, the abutting portion 23 is disposed so that the entire back surface of the abutting portion 23 abuts on the inner wall surface 101 a of the hole body 101. When the engaging portion 22 engages with the step 102 and the contact portion 23 contacts the inner wall surface 101a of the hole main body 101 in this way, the handrail portion 21 moves vertically from the manhole 100 toward the ground. It extends.

  The locked portion 24 is provided in the handrail portion 21 and locks one end portion of a roll-up type fall prevention device (safety lifting tool) 200 worn by a person. That is, it is plate-shaped, and a locking hole 24 a is formed at the center, and is fixed to the front side of the upper portion of each vertical portion 211 of the handrail portion 21. And as shown in FIG. 1, the hook (one end part) 202 by the side of the drum 201 of the winding type fall prevention instrument 200 can be hung on the locking hole 24a. Here, in the retractable fall-preventing device 200, the belt 203 is wound around the drum 201 so as to be drawn out and wound up, and the hook 204 on the free end side of the belt 203 is connected (attached) to a person. The movement of the belt 203 stops when a load is applied, thereby preventing a person from falling.

  In the chain lever hoist 3, the first hook 31 is connected to the half ring 25 of the handrail portion 21, and the eyebolt (other end portion) 33 connected to the second hook 32 is screwed into the bolt hole 103. By pulling the handrail portion 21, the abutting portion 23 is pressed against the inner wall surface 101 a of the hole main body 101, and the handrail portion 21 is kept upright.

  That is, it is composed of a commercially available and ready-made chain lever hoist, and the eye bolt 33 is connected to the second hook 32 via the shackle 34. Further, a chain 35 is disposed between the first hook 31 and the second hook 32, and the chain 35 (between the hooks 31 and 32) is expanded and contracted by operating the lever 36. Then, with the first hook 31 connected to the half ring 25 and the eyebolt 33 screwed into the bolt hole 103, the lever 36 is operated to contract the chain 35, and tension is applied to the chain 35. As a result, the handrail portion 21 is drawn toward the bolt hole 103 side, and the contact portion 23 is pushed by the inner wall surface 101a of the hole body 101, so that the handrail portion 21 is maintained in an upright state. That is, the handrail main body 2 does not fall to the bolt hole 103 side or warp back to the half bolt hole 103 due to the tension of the chain 35 and the pressing force of the contact portion 23, and the handrail main body 2 is maintained in an upright state. Is.

  Next, an operation and usage method of the manhole handrail 1 having such a configuration will be described. Here, a case will be described in which a maintenance worker enters and exits the manhole 100 to maintain and check the underground distribution line.

  In order to install the manhole handrail 1, first, the engaging portion 22 of the handrail main body 2 is engaged with the step 102, and the abutting portion 23 is brought into contact with the inner wall surface 101 a of the hole main body 101. The sliding portion 21 is in a state extending upward. Next, the first hook 31 of the chain lever hoist 3 is connected to the half ring 25 of the handrail 21, and the eye bolt 33 on the second hook 32 side is screwed into the bolt hole 103. Subsequently, the lever 36 is operated to apply tension to the chain 35 and draw the handrail portion 21 toward the bolt hole 103 side. Thereby, the contact part 23 is pressed by the inner wall surface 101a of the hole main body 101, and the handrail part 21 is maintained in the upright state.

  With the handrail 1 for the manhole attached in this way, the maintenance person enters and exits the manhole 100 with the handrail portion 21. Thereafter, when maintenance and inspection are completed, the lever 36 of the chain lever hoist 3 is operated to loosen the tension of the chain 35, the eyebolt 33 is removed from the bolt hole 103, and the first hook 31 is removed from the half ring 25. remove. Then, the handrail main body 2 is lifted to release the engagement of the engaging portion 22 and the handrail main body 2 is removed.

  As described above, according to the handrail 1 for the manhole, the manhole 100 can be safely and easily moved in and out with the handrail portion 21 in which the upright state is maintained. In addition, the engaging portion 22 is engaged with the step 102, the abutting portion 23 is brought into contact with the inner wall surface 101a of the hole main body 101, and the handrail portion 21 is simply pulled by the chain lever hoist 3; Can be performed alone.

  In addition, since the whole is only provided with a ladder-shaped handrail body 2 and a commercially available and ready-made chain lever hoist 3, it is not a large-scale one that surrounds the entire circumference of the manhole 100, so that it can be reduced in size and weight. Easy to transport and store. In this way, handling is easy, and since the existing step 102 and bolt hole 103 are used, the manhole 100 need not be modified.

  Further, since the locked portion 24 is provided in the handrail portion 21, the maintenance staff wears the roll-up type fall prevention device 200 and locks the hook 202 to the locked portion 24. The handrail 1 and the maintenance staff are connected and coupled, and the maintenance staff can be reliably prevented from falling.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the handrail main body 2 has a ladder shape, but may have a shape like a poolside handrail. Further, the case where one step 102 is provided on the inner wall surface 101 a of the hole main body 101 has been described. However, when a plurality of steps 102 are provided, the engaging portion 22 is engaged with the uppermost step 102. You can combine them.

  On the other hand, the holding means is composed of the chain lever hoist 3, but may be composed of other instruments as long as the handrail portion 21 can be pulled. Similarly, although the case where the safety lifting device is the roll-up type fall prevention device 200 has been described, other devices may be used. Moreover, although the handrail main body 2 and the holding means are separate bodies, they may be configured integrally.

DESCRIPTION OF SYMBOLS 1 Handrail for manhole 2 Handrail main body 21 Handrail part 22 Engagement part 23 Contact part 24 Locked part 3 Chain lever hoist (holding means)
31 First hook (one end)
33 Eyebolt (other end)
35 Chain 36 Lever 100 Manhole 101 Hall body 101a Inner wall surface 102 Step 103 Bolt hole 200 Retractable fall prevention device (safety lift)
202 Hook (one end)

Claims (2)

A manhole handrail for entering and exiting a manhole provided with a step extending in the horizontal direction on the inner wall surface of the hole body, and a bolt hole for fixing a manhole cover on the upper portion of the hole body,
An engaging portion that engages with the step;
With the engagement portion engaged with the step, a contact portion that contacts the inner wall surface of the hole body;
A handrail portion extending upward in a state where the engagement portion engages with the step and the contact portion contacts the inner wall surface of the hole main body;
With the one end connected to the handrail and the other end screwed into the bolt hole, the handrail is pulled toward the inner wall of the hole body by pulling the handrail. Holding means for holding the sliding portion in an upright state;
A handrail for manholes characterized by comprising: The handrail portion is provided with a locked portion for locking one end of a safety lifting device worn by a person.
The handrail for manholes according to claim 1, wherein

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