JP2002146791A - Fall preventive safety fence for use in shaft construction work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a conventional complicated procedure of installation/ removal of a safety fence arranged on the periphery of a shaft in order to prevent fall of workers and passengers, the safety shaft being arranged at the time of drilling circular or rectangular shafts in the ground at 20 to 70 m intervals, installing sewage pipes by drilling a tunnel from a starting shaft to an arrival shaft by a traversing propeller, and hardening the periphery of the drilled tunnel with concrete, in execution of sewage works, tunnel construction for burying gas pipes, etc. SOLUTION: There is provided a mechanism which simplifies installation/ removal work or installation/cleanup work of vertical columns having the fall preventive safety fence set thereon, by using a circular casing buried in the circular shaft or an H beam buried in the rectangular shaft. As a result, the setting/cleanup work of the fall preventive safety fence can be carried out in a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety fence for preventing a fall from being applied in a road construction for constructing a shaft such as a sewer construction, a tunnel construction for burying gas pipes, a subway tunnel construction and the like. Things.

[0002]

2. Description of the Related Art At present, in road construction such as sewer construction in urban areas (hereinafter referred to as sewer construction), construction pollution due to sewer construction, shortage of construction workers, aging and the like are serious problems. There is a need for further rationalization and labor saving of sewerage works and improvement of safety. So, 20 roads
Drilling circular shafts at intervals of ~ 40m and laying sewer pipes while digging between the circular shafts (KCMM method)
It has been actively adopted, and has greatly contributed to shortening the construction period, safe construction, and saving costs compared to the conventional earth retaining method using steel sheet pile and liner plate.

[0003] In this sewerage work, in short, a steel circular casing is hydraulically pressed into a road, excavation is performed by a hydraulic grab, and concrete pipes are excavated from a starting shaft to a reaching shaft by a traversing propulsion machine. Laying sewer pipes
When the required laying is completed, after the used equipment has been withdrawn, concrete construction will be completed except for the manhole opening and the necessary space connected to it.

[0004] Further, tunnel construction for burying gas pipes, tunnel construction for subways, etc. (hereinafter abbreviated as tunnel construction).
Then, a square or rectangular shaft (hereinafter referred to as a rectangular shaft) is dug at the road at intervals of 60 to 70 m, and the road is dug laterally with a cutter from the starting shaft, and the area around the excavated tunnel is solidified with concrete and arrived. The tunnel is dug up to the shaft and the desired tunnel is completed to complete the tunnel construction.

[0005]

In sewerage work, workers work in and near large circular shafts, and workers and passers-by who work near the shafts, especially those who pass by at night, fall into the shafts. In order to prevent accidents, a safety fence was installed around the shaft to prevent falls. In this safety fence, a plurality of columns (mainly pipes) are set at appropriate intervals in the circumferential direction of the circular casing, and the lower end portion of the column is welded to the inner peripheral surface of the circular casing to form a vertical column. Next, a column such as a pipe is fixed at an appropriate interval between the vertical columns with a bolt nut or a hinge or the like to form a plurality of horizontal columns. After the work is completed, loosen the bolts and nuts of the hinges and remove the horizontal supports, remove the vertical supports by gas cutting the lower ends of the vertical supports, remove the vertical supports, and remove the safety fence for fall prevention. Was. For this reason, the installation and removal of the safety fence for fall prevention requires a large number of workers and also requires the arrangement of welders and gas workers, and the work is complicated and costly. In addition, the vertical columns were cut off by gas when they were removed, so new vertical columns were required for each construction.

In tunnel construction, since workers work in and near large rectangular shafts, workers and passers-by who work near rectangular shafts, especially those passing by at night, fall into rectangular shafts. To prevent this, a safety fence was installed around the rectangular shaft to prevent falls. In this safety fence, the vertical column is fixed to the lining plate of the rectangular shaft by welding etc. at the square of the rectangular shaft and at appropriate intervals, and the upper and lower sides between the vertical columns are fixed with the upper horizontal column and the lower horizontal column, A plurality of wire meshes were fixed between the upper horizontal support and the lower horizontal support. After the completion of tunnel construction, remove the wire mesh, remove the wire mesh, remove the upper horizontal support and the lower horizontal support from the vertical support, and remove the vertical support from the lining plate to prevent crash. The fence had been removed. Therefore, a large number of workers are required to attach and remove the safety fence for fall prevention, and the operation is complicated and costly. In addition, it is necessary to cover the rectangular shaft with a lining plate for the traffic of cars at night, so the safety fence to prevent the fall was removed every time the work was completed on that day, and the work was started again the next day. Took a lot of time in addition to the actual tunnel work, since he had removed the lining plate and reassembled the safety fence for fall prevention before starting work.

[0007]

According to a first aspect of the present invention, there is provided a fuel cell system comprising: a lower casing having a groove width larger than the thickness of a circular casing penetrating a shaft, and having a groove width divided into two parts at appropriate positions in a longitudinal direction; It is a safety fence for fall prevention in a shaft construction comprising vertical supports having different lengths from the bottom and horizontal supports for fixing the vertical supports.

Next, a second invention of the present invention has a function in which the upper fixing hardware and the lower fixing hardware slide vertically and are fixed, and one side edge is fixed to the side surface of the upper fixing hardware. The other side is a plurality of partition plates that are open, and a vertical column fitting member provided between the partition plates and having an opening at the upper end for inserting the vertical column is rotated from the vertical direction to the horizontal direction or vice versa. An object of the present invention is to solve the above-mentioned problem by a fall prevention safety fence in a shaft construction composed of a function of moving and a bolt function of keeping the vertical column fitting member vertical.

[0009]

1 to 7 show an embodiment of the first invention of the present invention.
This will be described as a first embodiment with reference to FIG. 1 to 4, reference numeral 1 denotes a pipe as a vertical support (hereinafter referred to as a vertical pipe), 2 denotes a U-shaped groove cut out at the lower end of the vertical pipe 1, and 3 denotes a U-shaped groove 2. The semi-circular long branch fence 4 is a semi-circular short branch fence divided by a U-shaped groove 2 in section, and the length from the groove bottom of the short branch fence 4 is the long branch fence 3 Shorter than. 5 is an upper through-groove provided at the upper end of the vertical pipe 1,
Reference numeral 6 denotes an intermediate through-groove provided at an intermediate portion of the vertical pipe 1, reference numeral 7 denotes a steel circular casing embedded in a shaft provided for sewage works, and reference numeral 8 denotes a circumferential direction of the circular casing 7 provided at a groove bottom. 9 is an upper hinge fixed to the upper through groove 5 and 10 is a horizontal support pipe fixed to the upper hinge 9 with a bolt and nut 11 (hereinafter referred to as an upper horizontal pipe). , 12 is an intermediate hinge fixed to the intermediate through groove 6, and 13 is an intermediate horizontal pipe fixed to the intermediate hinge 12 with a bolt and nut 14. Incidentally, _{W 1,} the vertical pipe 1 at the lower end of the U-shaped groove 2 of width, _{W 2} in the thickness of the circular casing _7, the relationship of W 1> _{W 2.}

FIG. 5 is an assembly view of the first embodiment, FIGS. 6 and 7 are set views of the first embodiment, FIG. 6 is a plan view, and FIG. 7 is a side view. In FIGS. 5 to 7, the vertical pipes 1, 1,... Are set up vertically at appropriate intervals in the circumferential direction of the circular casing 7 using the U-shaped groove 2 at the lower end. In this case, the long branch fence 3 stands on the inner peripheral surface of the circular casing 7, while the short branch fence 4 contacts the outer peripheral surface of the circular casing 7. Next, the upper horizontal pipes 10 and 1 are connected to the upper hinges 9 and the bolts 11 and 14 of the intermediate hinges 12 attached to the upper through grooves 5 and the intermediate through grooves 6.
0,..., The intermediate horizontal pipes 13, 13,. .. Are connected by a chain 15 at different lengths of the vertical pipes 1, 1,... Where the intermediate horizontal pipes 13, 13,. The chain 15 may be detached and used at the entrance of the worker, such as at the start or end of work. Also,
In the case of withdrawing the construction after the sewer construction, the safety fence for crash prevention should be dismantled in the reverse work process of assembly.

Next, a second embodiment of the present invention will be described as a second embodiment with reference to FIGS. 8 is a side view of the second embodiment of the present invention, FIG. 9 is a partially enlarged side view thereof, FIG. 10 is a partially enlarged side view thereof, FIG. 11 is a front view, FIG. 12 is a plan view, and FIG. An example is a side view standing around a rectangular shaft opening, FIG. 14 is a side view of a fall prevention wire mesh standing around a rectangular shaft opening, and FIG. 15 is a side view in which a vertical column is fallen over the rectangular shaft opening. FIG. 16 is a plan view of a fall-preventing wire mesh that has been fallen into a rectangular shaft opening, and FIG. 17 is a side view of a fall-preventing wire mesh covered with a lining plate.

In FIGS. 8 to 17, reference numeral 16 denotes a frame for preventing displacement of the lining plate (not shown) for preventing the lining plate from shifting left and right and back and forth due to vibration.
Model steel, 18 is an upper fixing metal whose upper end surface is in contact with the lower surface of the upper plate of the H-shaped steel 17, 19 is a lower fixing metal that contacts a lower plate upper surface of the H-shaped steel 17 with a lower base plate 20, and the lower fixing metal 19 is an upper fixing metal. 18 is a size that slides up and down. Reference numeral 21 denotes a bottom plate having one end fixed to the upper fixing hardware 18, reference numeral 22 denotes a fixing jack bolt. The fixing jack bolt 22 passes through the bottom plate 21, and the lower end is fixed to the base plate 20. 23 is a fixing jack bolt 2
The fixing jack nut is screwed into the nut 2, and the fixing jack nut is provided below the bottom plate 21. 24 is a reinforcing plate having a bottom surface fixed to the bottom plate 21 and a side surface fixed to the upper fixing hardware 18, 25 is a partition plate, 26 is a bolt, 27
Is a rotary shaft for a vertical support pipe, and 28 is a vertical support.

Next, the relationship among the partition plate 25, the latch 26, the rotating shaft 27 for the vertical support pipe, and the vertical support 28 will be described with reference to FIGS. In the second embodiment shown in FIGS. 11 and 12, three partition plates 25a, 25b, 25c are fixed to the upper fixing metal 18 almost vertically. The vertical support pipe 30a penetrates between the partition plates 25a and 25b, and the vertical support pipe 30b penetrates between the partition plates 25b and 25c. 27 is a partition plate 25a, a vertical support pipe 3
0a, partition plate 25b, vertical support pipe 30b, partition plate 2
5c, the rotating shaft nuts 31a, 3a
Stopped at 1b. Vertical support pipes 30a and 30
The vertical struts 28a and 18b penetrate and are fixed to b. The latch 26 is rotatably fixed by a latch fixing bolt 29, and the latch groove 3 provided in the latch 26 is provided.
2 and a latch bolt 33 fixed to the upper fixing hardware 18 to temporarily stop. 14 and FIG.
Numeral 34 indicates a fall prevention wire mesh, and numeral 35 in FIG. 17 indicates a lining plate.

In the second embodiment, when a safety fence for preventing a fall is provided, an H-shaped steel 17 is provided at the opening edge of the rectangular shaft. The fixing hardware in which the upper fixing metal 18 and the lower fixing metal 19 are integrated is inserted between the upper plate lower surface and the lower plate upper surface of the H-shaped steel 17. Then, nut 23 for fixed jack
Is rotated around the fixing jack bolt 22 with a torque pliers or the like, and the upper fixing metal 18 is slid above the lower fixing metal 19 so that the upper surface of the upper fixing metal 18 and the lower fixing metal 1 are rotated.
9 and the base plate 20 at the lower end, and firmly fixed between the H-beams 17. The rotation shaft nuts 31a and 3 of the rotation shaft 27
By rotating 1b, the vertical support pipes 30a and 30b are fixed in the vertical direction, and the vertical supports 28a and 28b are inserted and fixed to the vertical support pipes 30a and 30b. Further, the latch groove 32 of the latch 26 is fixed with the latch bolt 33, and the vertical supports 28a, 28b, the vertical support pipes 30a, 3b,
0b is prevented from falling forward. In this state, the vertical columns 28 are provided upright on both sides of the rectangular shaft. This state is shown in FIG. As shown in FIG. 14, a fall prevention wire mesh is attached between the vertical supports 28, 28 to form a fall prevention safety fence around a rectangular shaft.

Next, when the tunnel construction on that day is completed, the following steps are performed. First, the latch 26 is removed from the latch bolt 33 through the latch groove 32, and then the rotating shaft nuts 31a and 31b are rotated and loosened, and the vertical support 28 is lowered to the opening side of the rectangular shaft, and the vertical support Defeat the pipe 30 as well. This situation is illustrated in FIG.
And FIG. In this state, the lining plate 35 is
7 to cover the opening of the rectangular shaft to prepare for traffic after construction. At the start of the next day's construction, after removing the lining plate 35, the vertical column 28 and the vertical column receiving pipe 30 are set up vertically, the bar 26 is hung to fix the vertical column 28 vertically, and the safety fence for fall prevention is set up. To start work.

[0016]

As described in detail above, according to the first invention of the present invention, the following excellent effects can be obtained. Since the work of assembling and disassembling the safety fence for fall prevention can be performed in a simple process, work efficiency is improved. No welding or gas work is required for assembling and dismantling the safety fence for fall prevention. Since there is no need to cut the vertical pipe at the time of dismantling, it can be used in the subsequent steps and the cost will be reduced. At the time of dismantling work, since the horizontal pipe can be set in parallel with the vertical pipe and transported by loosening the bolts and nuts of the hinges, the transport to the next workplace is easy, and the assembling work can also be easily performed.

According to the second aspect of the present invention, the following excellent effects can be obtained. Since the work of assembling and disassembling the safety fence for fall prevention can be performed in a simple process, work efficiency is improved. When the tunnel construction is completed on that day, the safety fence for fall prevention is fallen to the opening of the rectangular shaft, and a lining plate is placed on top of it to prepare for night traffic. After removing the safety fence, the safety fence for fall prevention can be completed simply by leaning the fall fence around the rectangular shaft, so that the work for assembling and removing the safety fence for fall prevention is easily performed, and the actual tunnel construction time is large. Earn money. It is not necessary to change the safety fence for fall prevention according to the shape of the rectangular shaft as in the past, and it is only necessary to slide the upper fixing metal and the lower fixing metal between the H-shaped steels, adjust them, and then fix them. It is responsive to any rectangular shaft. If there is no need to cover the lining plate with a rectangular shaft dug in a human way for safety reasons, the safety wire mesh of the safety fence for fall prevention is strong enough to withstand the weight of humans. All you have to do is fall down the safety fence to the opening of the rectangular shaft and place a rope between the pole with the flashing light around the rectangular shaft and the pole. In that case, a crane or the like for moving the lining plate is unnecessary, and there is no need to cover or remove the lining plate, so that the tunnel construction work can be performed extremely efficiently.

[Brief description of the drawings]

FIG. 1 is a side view of a vertical pipe according to a first embodiment of the present invention.

FIG. 2 is a front view of the vertical pipe according to the first embodiment of the present invention.

FIG. 3 is a vertical pipe according to the first embodiment of the present invention.
FIG. 3 is a sectional view taken along line I-III.

FIG. 4 is a sectional view of a hinge according to the first embodiment of the present invention.

FIG. 5 is an assembled side view of the first embodiment of the present invention.

FIG. 6 is a plan view in which the first embodiment of the present invention is set.

FIG. 7 is a set side view of the first embodiment of the present invention.

FIG. 8 is a side view of a second embodiment of the present invention. FIG. 8 is a side view of a second embodiment of the present invention,

FIG. 9 is a partially enlarged side view of FIG. 8 according to the second embodiment of the present invention.

FIG. 10 is a partially enlarged side view of FIG. 9 according to the second embodiment of the present invention.

FIG. 11 is a front view of a second embodiment of the present invention.

FIG. 12 is a plan view of a second embodiment of the present invention.

FIG. 13 is a side view of the second embodiment of the present invention set up around a rectangular shaft opening.

FIG. 14 is a side view of a fall-prevention wire mesh erected around a rectangular shaft opening in a second embodiment of the present invention.

FIG. 15 is a side view of a second embodiment of the present invention, in which a vertical column is lowered at a rectangular shaft opening.

FIG. 16 is a plan view in which a fall prevention wire mesh covers the rectangular shaft opening in the second embodiment of the present invention.

FIG. 17 is a side view showing a state in which a lining plate is covered on a fall prevention wire mesh in the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vertical pipe 2 ... U-shaped groove 3 ... Long branch fence 4 ... Short branch fence 5 ... Upper penetration groove 6 ... Middle penetration groove 7 ... Circular casing 8 ...・ Left / right fall prevention bracket 9 ・ ・ ・ Top hinge 10 ・ ・ ・ Top horizontal pipe 11 ・ ・ ・ Bolt nut 12 ・ ・ ・ Intermediate hinge 13 ・ ・ ・ Intermediate horizontal pipe 14 ・ ・ ・ Bolt nut 15 ・ ・ ・ Chain 16 ・..Frame for preventing displacement of lining plate 17: H-shaped steel 18: upper fixing hardware 19: lower fixing hardware 20: base plate 21: bottom plate 22: fixing jack bolt 23 ... Nut for fixed jack 24 ... Reinforcement plate 25 ... Partition plate 26 ... Bolt 27 ... Rotating shaft for vertical support pipe 28 ... Vertical support 29 ... Bolt fixing bolt 30 ... Vertical Prop receiving pipe 31 ・ ・ ・ Rotating shaft nut 32 ・ ・ ・Latch groove 33 ・ ・ ・ Latch bolt 34 ・ ・ ・ Fall-prevention wire mesh 35 ・ ・ ・ Backing plate

Claims (2)

[Claims] 1. A vertical column whose lower end is divided into two portions at appropriate positions in a longitudinal direction with a groove width larger than the thickness of a circular casing penetrated into a shaft and having different lengths from the groove bottom. A safety fence for preventing a fall in a shaft construction, comprising a horizontal support for fixing between vertical supports. 2. An upper fixed metal part and a lower fixed metal part have a function of sliding up and down and being fixed. One side is fixed to the side of the upper fixed metal and the other side is opened. A plurality of partitioning plates, a function provided between the partitioning plates and having a top end provided with an opening portion into which the vertical support is fitted, for rotating a vertical support fitting member from a vertical direction to a horizontal direction or vice versa, and the vertical support A safety fence for preventing falling in shaft construction, comprising: a latch function for keeping the insertion member vertical.