JP2554624Y2 - Underframe support frame with ladder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an underground structure provided with a ladder for fall prevention and ascending and descending provided in an opening of a receiving frame installed for underground structures such as water and sewage, electric power communication and the like.
About the use received frame.

[0002]

Ladder as underground construction for receiving frames having a BACKGROUND OF THE INVENTION and for elevating fall prevention conventionally, for example, real Publication 60-3
A manhole with a ladder disclosed in Japanese Patent No. 3162 is known.

In this manhole, a pivoting piece for pivotally supporting the left and right side rods of the ladder is projected from an inner peripheral surface of a receiving frame , and a base of the side rod is pivotally supported by the pin so as to be able to be raised and lowered. In addition, there is provided a fixing mechanism for directly fixing the side rod of the ladder and the pivoting piece in the upright state.

[0004]

An invention is to provide a this fixing mechanism is a structure for fixing to contact the base and pivot piece of side beams of the ladder
However, the contact surface between the base of the side rod of the ladder and the pivot piece is a fixing mechanism.
Since it is only the inner vertical surface of the (ring stop or long hole), it cannot have sufficient strength, and has problems such as lack of stability in a standing state and wobbling. Also, as a fixing mechanism
When using long holes to improve the stability of the ladder
It is necessary to form a long hole long and insert deeply, but if it is formed too long, the strength of the portion will decrease,
There is a problem that the fixing mechanism itself is damaged when a strong load is applied to the tip of the ladder.

[0005] The present invention is intended to solve such problems, in underground construction for receiving frames having a liftable ladder is securely held stably the ladder upright with a simple operation The purpose is to:

[0006]

Means for Solving the Problems] receiving frame for underground construction having a ladder of the present invention includes a receiving frame having a mounting seat in the open mouth portion inner peripheral surface, and a mounting frame attached to the mounting seat, the proximal portion to consists of a ladder provided with an attachment member, wherein the ladder is pivotally supported liftable coupling member provided in front Symbol mounting frame, and a vertical abutment surface to surface engagement in the standing state and the horizontal abutment surface It is characterized in that it is formed on each of the mounting member and the connecting member.

Further , in such a configuration, the connection
The member has a bifurcated holding portion, and the mounting member has a front end.
The narrow part clamped by the clamping part and the width connected to it stepwise
Forming an enlarged portion, and in the upright state, extending the widened portion
Surface and the upper surface of the holding portion, and the mating portion of the narrow portion and the holding portion.
The vertical surface of the holding part shall be faced
it can.

[0008]

In underground construction for receiving frame having a ladder of the effects of the present invention, the erecting of the ladder from the inclined state, the mounting member
Horizontal and vertical contact surfaces respectively formed on the connecting member
By Mengo and to hold the upright by constraining the rotation of the ladder.

[0009]

Next, the features of the present invention will be specifically described based on the embodiment shown in the drawings.

[0010] Figure 1 is a perspective view of the underground construction for receiving frame view with the ladder of this embodiment showing a standing state of the ladder, Figure 2 is a plan view showing the inclined state of the ladder, Figure 3 is an exploded around the mounting seat Perspective view,
FIG. 4 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 5 is a perspective view for explaining a connection state between the connection member and the mounting member.

Reference numeral 1 denotes a receiving frame for an underground structure, and a mounting seat 2 is provided on the inner peripheral surface of the opening. As shown in FIG. 3, the mounting seat 2 has an arcuate horizontal shelf 2a extending inward from the inner peripheral surface of the opening and a projection 2 projecting upward from the horizontal shelf 2a.
b on the inner peripheral surface of the receiving frame 1 at equal intervals of 60 degrees.
There are several places. Reference numeral 3 denotes a mounting frame, which is provided with a bent frame 3a and a reinforcing rod 3b for connecting the frame 3a. 2 attached.

Reference numeral 4 denotes a bolt 7a and a nut 7b
As shown in FIG. 3, the upper block 5 has a notch 5a and a bolt hole 5b into which a projection 2b provided on the mounting seat 2 of the receiving frame 1 can be fitted, and a cross section having a bolt hole 6a. The upper and lower blocks 5 and 6 sandwich the mounting seat 2 with bolts 7.
a. The nut 7b can be screwed and fixed.

The connecting member 8 includes bolts and nuts 9 on the mounting frame 3.
4 and 5, a fork-shaped holding portion 8 for holding a narrow portion 13b of a mounting member 13 provided on a ladder 11, which will be described later, as shown in FIGS.
a, and a through hole 8b for inserting the support shaft 10 is formed.

[0014] Ladder 11 is composed of transverse rods 11b of six connecting the frame 11a and the frame 11a, <br/> with seats preparative the receiving frame 1 in a state the distal end portion of the ladder 11 Tilt facedown ladder 11 A pair of left and right L-shaped locking pieces 12 to be locked to 2 are provided. The locking piece 12 is formed with a notch 12 a that locks with the projection 2 b of the mounting seat 2. Further, a mounting member 13 connected to the frame 11a and the horizontal rod 11b is provided at a base end of the ladder 11. As shown in FIGS. 4 and 5, the mounting member 13 has a widened portion 13a formed on one side and a narrowed portion having a width which can be held by the holding portion 8a of the connecting member 8 on the other side. 13b, and a vertically long slot 13c is formed in the narrow portion 13b. 13 f
Is an R portion in which the lower end of the narrow portion 13b is cut out in an arc shape.

As described above, the mounting member 1 provided on the ladder 11
3 is sandwiched between the holding portions 8a of the connecting member 8, and the ladder 11 is connected to the mounting frame 3 in an up-and-down manner by the support shaft 10 inserted through the through holes 8b and the long holes 13c. Therefore, when the ladder 11 is in the upright position, the dashed line in FIG.
Alternatively, as shown in FIG. 5, the upper surface 8d of the connecting member 8 and the projecting surface 13d of the widened portion 13a of the attachment member 13 serve as a horizontal contact surface due to the weight of the ladder 11, and the mating portion 13e of the narrow portion 13b. And a vertical surface 8c of the holding portion 8a is a vertical contact surface.
It becomes Mengo state as, ladder 11 is no wobbling in an upright state. Further, when using the ladder 11 as fall prevention lifts one end the ladder 11 to the support shaft 10 is positioned at the lower end of the long hole 13c, good <br/> if brought into credit facedown in that state.

Incidentally, the mounting frame 3 connects the fixing tool 4 to the bolt 7a.
By tightening with the nut 7b, the mounting seat 2
It is fixed to. Therefore, since the bolt 7a and the nut 7b can be removed by loosening them, the bolts 7a and the nuts 7b can be replaced at any of the mounting seats 2 provided at six places on the inner peripheral surface of the opening even after installation.

The mounting frame 3 is a pair of left and right.
Because each is attached to two mounting seats 2,
The load applied to the connecting member 8 is dispersed to eliminate wobble and instability.

[0018]

As described above, according to invention the effect of ## the underground construction for receiving frame having a ladder of the present invention, it was formed on the can <br/> that is erected a ladder body and connecting member and the mounting member The horizontal contact surface and the vertical contact surface can be set to face each other.
For this reason, the rotation of the ladder is restrained and does not fluctuate even when going up and down, and the ladder can be reliably held in the upright state by a simple operation.

Further , the connecting member has a bifurcated holding portion and an attachment.
Equipped with a narrow part provided on the member and a wide part connected in a stepwise fashion
In the case where it can be
The horizontal and vertical planes help the ladder stand upright.
It is possible to further stabilize and secure safe work.

[Brief description of the drawings]

1 is a perspective view of the underground construction for receiving frame having a ladder of this embodiment showing a state in which a standing ladder.

2 is a plan view of the underground construction for receiving frame having a ladder of this embodiment showing a state in which tilting the ladder.

FIG. 3 is an exploded perspective view around the mounting seat.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a perspective view for explaining a connection state between a connection member and a mounting member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Receiving frame 2 Mounting seat 2a Horizontal shelf 2b Projection 3 Mounting frame 4 Fixture 5 Upper block 6 Lower block 8 Connecting member 8a Clamping portion 8b Through hole 8c Vertical surface (vertical contact surface) 8d Upper surface (horizontal contact surface) 10 Support shaft 11 Ladder 11a Frame 11b Horizontal rod 12 Locking piece 13 Attaching member 13a Wide part 13b Narrow part 13c Long hole 13d Projecting surface (horizontal contact surface) 13e Mesh portion (vertical contact surface)

Claims (6)

(57) [Scope of request for utility model registration] A receiving frame which 1. A and the mounting seat is provided in the opening peripheral surface, made up of a mounting frame attached to the mounting seat, a ladder with a mounting member provided at the proximal end, wherein the ladder is pre Symbol mounting frame A ladder, wherein a vertical abutment surface and a horizontal abutment surface pivotally supported by the connecting member provided on the mounting member and face each other in the upright state are formed on each of the mounting member and the connecting member. Underframe for underground structures. Wherein the Consolidated member to form a bifurcated clamping unit, the member Mounting forming a width widened part continuing stepwise thereto and the narrow portion sandwiched the sandwiching portion, ladders of the standing state, according to claim 1, characterized in that engaged respectively face the vertical surface of the sandwiching portion and the upper surface and the narrow portion of the surface engagement portion of the a projecting surface holding portions having a width widened part
Underframe for underground structures with ladders . 3. A mounting frame for fixing a ladder to a mounting seat.
The fixture has an upper block that sandwiches the mounting
And the lower and upper and lower blocks.
Claims comprising bolts and nuts to be attached
An underground structure provided with the ladder according to claim 1 or 2.
Receiving slot. 4. The mounting frame is a pair of left and right.
A special feature is to provide multiple fixtures for each of these mounting frames.
The ladder according to any one of claims 1 to 3,
Underground structure receiving frame provided. 5. A connection member provided on a mounting frame, which can be raised and lowered.
The ladder pivot means is a slot formed in the mounting member.
The method according to any one of claims 1 to 4, wherein
Underframe for underground structures with ladders. 6. The ladder is locked on the inner peripheral surface of the receiving frame in a state of being laid down.
Ladders to make sure that the ladder doubles as a fall prevention
The ladder according to any one of claims 1 to 5, characterized in that:
Underframe for underground structures.