JP3133043U - Protective net - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective net that is lighter and easier to carry than before.
A support frame 13 having a ladder shape in which horizontal frames 6 to 9 are horizontally mounted between a pair of right and left support columns 4 and 5 bent in the bent portions 2 and 3. On the other hand, a protective net formed by stretching a net 14. The lower ends of the standing leg portions 4 ′ and 5 ′ of the columns 4 and 5 and the tips of the telescopic rods 11 and 12 are formed sharply.
[Selection] Figure 1

Description

  The present invention relates to a protective net used in tunnel construction or the like, and more particularly, to a protective net for protecting a worker from an accident of falling a face in an operation performed by a worker approaching the face.

In the tunnel excavation work, the work that the worker needs to perform near the face includes explosive charging, support construction, chemical injection work in the auxiliary method, and the like.
Although such work only occupies about 30 to 50% of the total work time, the ratio of the face collapse accident to the total accidents in tunnel construction is very high.

  Face collapse accidents can be divided into two major types: the fall of the face (almost vertical and tightly inclined surface) and the fall of the excavation payment face (ceiling surface). Considering that there are many cases where the above countermeasures are implemented and due to the factors of gravity action, it seems that accidents caused by collapse of the excavation payment surface occur more frequently than accidents caused by collapse of the face of the face.

In particular, the work related to the support installation is performed by an operator paying attention to the feet, and it is difficult to pay attention to the falling objects from the excavation payment surface.
Therefore, it is important to take measures to effectively protect workers against collapse from the excavation payment surface (rock fallout and sediment removal).
At present, measures are taken by arranging face guards and having workers wear protectors, but accidents occur suddenly, and injuries occurred while wearing protectors. Therefore, such measures are not sufficient.

As a worker protection plate for protecting a worker from falling objects, the one described in Patent Document 1 is already known.
This worker protection plate is formed by raising and bending an FRP plate body having a corrugated cross section, and the worker stands up against the tunnel wall surface and safely in the work space formed below the worker protection plate. Work can be done.

Shoko 52-5922

  However, it is preferable to reduce the weight of the worker protection plate as much as possible in order to facilitate carrying.

  Accordingly, an object of the present invention is to provide a protective net that is lighter and easier to carry than conventional ones, while having sufficient strength to protect workers from falling objects.

  The present invention according to claim 1 is a protective net in which a net 14 is stretched around a support frame 13 having a ladder shape.

  The present invention according to claim 2 is the protective net according to claim 1, wherein the support frame 13 is formed by horizontally placing horizontal supports 6 to 9 between a pair of left and right columns 4 and 5.

  According to the third aspect of the present invention, the struts 4 and 5 are connected to the upright legs 4 'and 5' and the heads 4 "and 5" connected to the upright legs 4 'and 5' through the bent parts 2 and 3, respectively. The protection net according to claim 2, wherein the side surface of the support frame 13 is a “he” shape.

  The present invention according to claim 4 is formed by inserting telescopic rods 11 and 12 into the heads 4 "and 5" of the respective columns 4 and 5 so that the protruding lengths can be individually set and fixed. 3 is a protective net.

  The invention according to claim 5 is the protection according to claim 4, wherein the lower ends of the standing legs 4 'and 5' of the support columns 4 and 5 and the tips of the telescopic rods 11 and 12 are formed sharply. The net.

  The present invention according to claim 6 is the protective net according to claim 1, 2, 3, 4 or 5, wherein the net 14 is fixed to the support frame 13 at a side edge portion of the support frame. .

  The present invention according to claim 7 is the protective net according to claim 6, wherein the net 14 is fixed by sewing.

  In the present invention according to claim 8, the net 14 is fixed by sandwiching the net 14 between a receiving frame 16 fixed to the support frame 13 and a net pressing frame 17 fitted thereto. A protection net according to claim 6.

  In the present invention according to claim 9, the bent portions 2 and 3 are straddled by fixing both ends to the heads 4 "and 5" of the support columns 4 and 5 and the standing leg portions 4 'and 5'. The protective net according to claim 3, 4, 5, 6, 7 or 8, further comprising bent portion reinforcing rods 19 and 20 arranged in the above-described manner.

  The present invention according to claim 10 is provided with leg reinforcement rods 21 and 22 fixed at both ends to the horizontal rod 9 and the standing leg portions 4 'and 5', respectively. , 7, 8 or 9.

  The present invention according to claim 11 is the protective net according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the net 14 is made of high-density polyethylene.

  The protective net of the present invention has sufficient strength to protect workers from collapsed objects, and is lighter and easier to carry than conventional ones, thereby eradicating accidents.

  Hereinafter, although an example explains the present invention, the present invention is not restricted to this.

The protection net 1 according to the present invention is a steel pipe having a length of 2.7 m and a diameter of 20 mm. Further, telescopic rods 11 and 12 are opened at the ends of the support columns 4 and 5 of the frame body 10 in which four horizontal rods 6 to 9 made of steel pipe having a diameter of 20 mm are horizontally mounted and fixed at intervals. And a support frame 13 having a ladder shape with a side shape of “he” and a 10 mm high-density polyethylene net 14 stretched on the outer surface of the support frame 13. It is.
The total width a of the protective net 1 is about 0.8 m, the total height b is about 2 m, and the distance c between the horizontal rods 6 to 9 is about 0.6 m.
The support columns 4 and 5 of the frame body 10 are bent at about 30 ° to 45 ° at the bent portions 2 and 3, and a lower end side portion (standing leg portion) 4 ′ from the bent portions 2 and 3. , 5 '(approx. 2.1m) and the tip side part (head) 4 ", 5" (approx. 60cm) continuous through the bent parts 2 and 3 form a "he" shape. It is what.
In addition, the diameter of the support | pillars 4 and 5 and the horizontal racks 6-9 can be changed, and the number of the said horizontal racks 6-9 can be increased / decreased suitably.

The telescopic rods 11 and 12 are inserted by inserting pins 15 'into any one of a plurality of pin holes 15 arranged and opened at intervals of 50 mm on the side surfaces of the heads 4 "and 5" of the columns 4 and 5, The protruding lengths from the tips of the heads 4 ″ and 5 ″ of the columns 4 and 5 can be individually set and fixed within a range up to about 30 cm (FIG. 3).
Therefore, the protruding lengths of the two telescopic rods 11 and 12 can be set to be the same or different (FIGS. 1 and 2).
The tips of the telescopic rods 11 and 12 and the lower ends of the columns 4 and 5 are formed sharply.

The net 14 is covered from the outer surface of the support frame 13 so as to cover a range from the uppermost horizontal frame 6 to the lowermost horizontal frame 9 of the support frame 13, and both left and right edges thereof are supported by the support frame. The side edges of 13 are wound around the support posts 4 and 5 and are sewn, and the upper and lower edges are secured by winding and suturing the above horizontal saddles 6 and 9 (FIG. 4). The edge of the net 14 may be fixed by welding or binding (not shown).
Further, as shown in FIG. 5, a receiving frame 16 for fixing the net 14 is fixed to the support frame 13 side, and the engaging piece 18 of the net presser frame 17 fitted to this is attached to the net 14. It is also possible to fix it by inserting it into the receiving frame 16 with the pinch in between.

  Since the net 14 is made of high-density polyethylene, it is strong against impact load, is relatively inexpensive, and can be easily replaced.

19 is disposed across the bent portion 2 by welding and fixing the both ends thereof to the heads 4 ″, 5 ″ of the column 4 and the standing leg portions 4 ′, 5 ′. A bent portion reinforcing rod 20 that reinforces the portion 2 and reinforces the support column 4 so as not to bend, and has both ends thereof connected to the head portions 4 ″, 5 ″ of the support column 5 and the standing leg portions 4 ′, 5 ′. It is a bending portion reinforcing rod which is arranged so as to straddle the bending portion 3 by welding and fixing, reinforces the bending portion 3 and reinforces the support column 4 so as not to bend.
21 and 22 are leg reinforcement rods whose ends are welded and fixed to the center of the lowermost horizontal rod 9 and the standing leg portions 4 'and 5' of the columns 4 and 5, respectively.

  The protective net 1 constructed as described above is such that the lower ends of the standing legs 4 ′ and 5 ′ of the columns 4 and 5 are grounded to a required place, and the tips of the heads 4 ″ and 5 ″ of the columns 4 and 5 are connected. By installing the expansion rods 11 and 12 so as to be in contact with the wall surface, it is possible to protect workers from collapsed objects such as earth and sand, and to perform necessary work in the inside. A work space 23 can be formed.

The installation of the leg portion, which is sharp, and the tips of the telescopic rods 11 and 12 are inserted into the ground and the wall surface to ensure stability, and the installation position shifts due to the load of collapsed objects, Do not fall down.
Also, if the wall surface is uneven, or if only one side of the wall of the installation location is a shotcrete surface and there is a step on the wall surface, adjust the length of both telescopic rods 11 and 12 respectively. Install.

  The work space 23 has a height (about 2 m) at which an operator can stand and work, and a depth (about 1.5 m) that does not hinder the horizontal positioning of the scoop. Since it has a width (0.8m) that can protect the staff, it is possible to safely perform work such as leveling with a scoop, laying a plate, and installing and fixing a steel support. .

  In addition, the conventional worker protection plate has a problem that it is difficult for a worker working in the work space to visually recognize the state of the upper face. Since the worker can also visually confirm the state of the upper wall surface and the face through the net 14, the worker can work safely.

The assumed collapsed objects are mud and mud in the earth and sand tunnel, and rock in the rocky mountain tunnel. Judging from the position of the construction site, the weight is considered to be about 10 to 200 kg for earth and sand and about 100 to 200 kg for rocks.
Therefore, the strength of the protective net 1 is such that when 200 kg of earth and sand or rock falls free of 1 m (distance between the protective net 1 and the excavation payment surface directly above it, assumed in the work in the tunnel), the protective net It is set to such an extent that even if 1 is damaged, workers are not injured. The strength can be adjusted by changing the diameter of the columns 4 and 5 or the diameter and number of the horizontal rods.
The protective net 1 is composed of a ladder-shaped support frame 13 and a net 14 and does not use steel plates, so the weight is less than 30 kg and can be easily moved and installed by one worker. It is.

  Hereinafter, an example of a work procedure in tunnel construction using the protective net 1 of the present invention will be shown.

(1) After excavation, slipping, and sawing of the tunnel 31, the face inspector checks the situation of the face 32 and reports it to the foreman.
(2) After confirming the stability of the face 32, the safety protection net 1 is installed at a place where the floor leveling of the support installation place is performed under the double check of the face inspector and face monitor (see FIG. 6). Left half and FIG. 7).
(3) The worker performs operations such as checking the position and height, leveling the floor, etc. in the installed protective net 1.
(4) After the work is completed, remove the protective net (right half of the figure).
(5) Install a steel support in place with jumbo. At that time, the protective net 1 is again installed at the support installation location, and necessary work is performed by the workers therein.

1 is a perspective view of a protective net according to an embodiment of the present invention. It is a front view of the said protection net. It is the elements on larger scale which show the expansion-and-contraction hook of the support frame of the said protection net. It is the elements on larger scale which show the fixation state of the net | network in the side edge part of the said support frame. It is the elements on larger scale which show the other fastening method of a net | network. It is a cross-sectional view of a tunnel showing a situation where work is performed using the protective net. It is a longitudinal cross-sectional view same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Protective net | network 2, 3 Bending part 4, 5 Support | pillar 4 ', 5' Standing leg part 4 ", 5" Head 6-9 Horizontal gutter 10 Frame main body 11, 12 Telescopic gutter 13 Support frame 14 Net 15 Pin hole 15 'pin 16 receiving frame 17 net holding frame 18 engaging pieces 19, 20 bent portion reinforcing rods 21, 22 leg portion reinforcing rods 23 working space

Claims (11)

  A protective net comprising a net (14) stretched over a ladder-shaped support frame (13).   The protective net according to claim 1, wherein the support frame (13) is formed by horizontally placing a horizontal rack (6-9) between a pair of left and right support columns (4, 5).   The above strut (4, 5) is “fed” by the standing leg (4 ′, 5 ′) and the head (4 ″, 5 ″) continuous through the bent portion (2, 3). The protective net according to claim 2, characterized in that the shape of the protection frame (13) is a lateral shape of the support frame (13).   The telescopic hooks (11, 12) are inserted into the heads (4 ″, 5 ″) of the support columns (4, 5) so that the protruding lengths can be individually set and fixed. The protective net according to claim 3.   The lower end of the standing leg (4 ', 5') of the column (4, 5) and the tip of the telescopic rod (11, 12) are formed sharply. Protective net.   6. The protective net according to claim 1, 2, 3, 4 or 5, wherein the net (14) is fixed to the support frame (13) at a side edge of the support frame.   7. The protective net according to claim 6, wherein the net (14) is secured by sewing.   The net (14) is fixed by sandwiching the net (14) between a receiving frame (16) fixed to the support frame (13) and a net pressing frame (17) fitted to the receiving frame (16). The protective net according to claim 6, wherein:   By fixing both ends to the head (4 ″, 5 ″) and the standing leg (4 ′, 5 ′) of the column (4, 5), the bent portion (2, 3) is straddled. The protective net according to claim 3, 4, 5, 6, 7 or 8, further comprising a bent portion reinforcing rod (19, 20) arranged in a bridge.   A leg reinforcing rod (21, 22) having both ends fixed to the horizontal rod (9) and the standing leg (4 ', 5') is provided. The protective net according to 5, 6, 7, 8 or 9.   11. A protective net according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the net (14) is made of high-density polyethylene.

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