JP6465531B1 - Fall prevention fence and excavation method using the same - Google Patents

Abstract

A fall prevention fence that can be installed and collected in a short time without requiring a large installation space, and an excavation method using the same.
A fall prevention fence used for excavation work in which excavation is performed along a traveling direction of a road 1 using a heavy machine 6 and prevents an operator on the road 1 from falling into an excavation groove 2. It is attached to the opening edge of the cut groove 2 and extends along the road surface to the outer side in the width direction of the cut groove 2, and is outside the vehicle width of the heavy machine 6 when the traveling heavy machine 6 rides on the upper side. The horizontal arm member 10 provided with the column support 13 located at the position, the fixing means 20 that is installed in the cut groove 2 and presses the horizontal arm member 10 outward in the width direction, and the column 30 that is erected on the column support 13. And a cross beam 40 that is mounted across the columns 30 adjacent in the traveling direction of the road 1.
[Selection] Figure 1

Description

  The present invention relates to a fall prevention fence used for excavation work to prevent an operator from dropping onto the excavation part, and an excavation work method using the same.

  For example, in a construction in which a water pipe or the like is buried or repaired / replaced on the lower side of a road, a groove having a length of several tens of meters is continuously cut along the traveling direction of the road. A heavy machine such as a backhoe is used for the excavation work, and the crawler travels on both sides in the width direction across the excavation groove, and the excavation groove in the central portion is dug with the bucket.

  In such excavation work, it is necessary to take measures for preventing the operator from falling into the excavation groove. For example, Patent Document 1 discloses a method in which a cut beam is installed over the groove width in the cut groove, and an operator attaches a safety belt using the cut beam, although the cut groove is relatively large. ing.

Japanese Patent Laid-Open No. 10-57514

  The technique of the above-mentioned patent document 1 is for attaching a safety belt inside the cut groove, and is effective in preventing a worker who works in the cut groove from falling. However, it is impossible to prevent the operator who falls outside the opening of the cut groove from falling.

  It is also conceivable to provide a fall prevention fence or lifeline (master rope) along the opening of the cut groove. However, since the heavy machinery described above needs to move across the opening in the cut groove, it is difficult to install a fence near the opening.

  On the other hand, although it is conceivable to provide a fence at a portion further outside the vehicle width of the heavy machinery, there is no space for installing the fence. More specifically, a fence that has a structure that is placed on a road and has a strength that can withstand a load that exceeds the weight of the operator is structurally large and requires a large installation space. Especially in urban areas or in the suburbs, the construction space can only be secured within the width of one lane so that the road can be done on one side of the road. It is difficult to ensure. Furthermore, it is not practical to spend time on installation and collection of such heavy and heavy fences at the site where restoration is required on the same day.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a fall prevention fence that does not require a wide installation space and can be installed and collected in a short time, and an excavation method using the same. Is to do.

  In order to solve the above-mentioned problem, the fall prevention fence of the present invention is used for an open work that performs a cut along a road traveling direction using a heavy machine, and an operator on the road falls into a cut groove. The heavy machinery is attached to the opening edge of the cut groove, extends along the road surface to the outer side in the width direction of the cut groove, and the heavy machinery that travels rides on the upper side. A horizontal arm member provided with a column support positioned outside the vehicle width, a fixing means installed in the cut groove and pressing the horizontal arm member outward in the width direction, and standing on the column receiver And a cross beam attached across the struts adjacent in the traveling direction of the road.

  The horizontal arm member has a crawler riding part and a fixing part connected to an end in the width direction of the crawler riding part, and the fixing part is directed downward from the opening edge of the cut groove. The fixing portion is pressed in the width direction by the fixing means.

  Further, the horizontal arm member may be folded until the crawler ride-up portion and the fixed portion are rotatably connected, and the crawler ride-up portion and the fixed portion are in a substantially parallel state. it can.

  Furthermore, the fixed portion is provided with a pedestal that protrudes inward in the width direction of the cut groove in a state in which the horizontal arm member is attached to the cut groove. And the height of the said base of the said fixing | fixed part may be formed substantially the same.

  On the other hand, the excavation work method using the fall prevention fence according to the present invention provides the fall prevention according to any one of claims 1 to 4 when performing excavation along a road traveling direction using a heavy machine. After the first cut groove having a depth that does not require a safety belt is opened in advance by the operator, the fall prevention fence is attached to the opening edge of the first cut groove, and the heavy machine Is moved to a predetermined position while traveling above the crawler riding part of the fall prevention fence, and the operator further cuts the second cut groove having a depth that requires a safety belt, while the outside of these cut grooves The worker who works in (1) attaches a safety belt to the fall prevention fence to perform the work.

  Since the fall prevention fence according to the present invention is provided with a horizontal arm member extending from the edge of the cut groove to the outside of the vehicle width of the heavy machine, the horizontal arm member is fixed using the edge of the cut groove. While the pressure is fixed using the means, the support can be erected on the outside of the heavy machinery with this fixing force. Therefore, a large space (space exceeding the range of one lane) is not required for installation of the fall prevention fence. Moreover, since each member which comprises a fall prevention fence can each be conveyed manually, it can be installed easily in a short time. Furthermore, since heavy machinery can run above the horizontal arm member, even after the fall prevention fence is installed, excavation work can be performed using heavy machinery, and workers on the road can safely use safety belts. You can proceed to work.

  Moreover, in the excavation work method using the fall prevention fence according to the present invention, even after the fall prevention fence is installed, the excavation groove can be further dug deeper using a heavy machine. Moreover, even if the depth of the cut groove exceeds the depth that requires the safety belt, the worker on the road can safely work by attaching the safety belt to the fall prevention fence.

It is a schematic diagram which shows the state which has installed the fall prevention fence which concerns on embodiment of this invention in an excavation groove, and is performing excavation work. It is a schematic diagram which shows the state currently excavated to the depth of D1 dimension using a heavy machine. It is a schematic diagram which shows the state which installed the sheet pile and the fall prevention fence with the depth of D1 dimension. It is a schematic diagram which shows the state in which the worker is working inside and outside the cut groove. FIG. 5 is a cross-sectional view of the state shown in FIG. 4 in which the cut groove is cut along a plane parallel to the traveling direction. It is a front view of a horizontal arm member, Comprising: (A) is a state when using, (B) is a state at the time of conveyance and accommodation. It is a top view of a horizontal arm member. FIG. 7 is a right side view of FIG. It is an exploded view of the X section of FIG.

Hereinafter, the fall prevention fence which concerns on embodiment of this invention is demonstrated in detail using drawing.
In addition, the width direction used in the following description refers to the left and right direction (the width direction of the road) in FIG. 1, and the traveling direction refers to the depth direction (the longitudinal direction of the road) and the vertical direction in FIG. The vertical direction in FIG. 1 is assumed.

  1 to 5 are schematic views showing a state in which a fall prevention fence is installed in the excavation groove 2 (2a, 2b) and excavation work is performed. 1 to 4 show a cross section obtained by cutting the cut groove 2 along a plane perpendicular to the running direction, and FIG. 5 shows a cross section obtained by cutting the cut groove 2 along a plane parallel to the running direction.

  On the road 1, excavation work for burying, repairing, or exchanging various pipes 4 in the underground of the road 1 is performed. Here, “various pipes 4” used in the present specification collectively refers to all things embedded or constructed in the ground of roads such as water supply, communication, sewage, electric power, and culvert. .

  The dimensions of the cut groove 2 formed by the cut work vary depending on the site. As shown in FIG. 1, the length in the width direction is W1 (about 1 to 2 m), and the depth is D1 + D2 (about 2 m or more). In most cases. Then, the cut groove 2 is formed over a length of several tens of meters continuously in the traveling direction of the road.

Initially, the procedure of the excavation work using the fall prevention fence of this invention is demonstrated.
This excavation work is performed within the width of one lane of the road 1, and as shown in FIG. 2, a heavy machine 6 such as a backhoe or a hydraulic excavator is driven in this one lane along the road traveling direction. Thus, the first cut groove 2a is formed. The first cut groove 2a has a depth of D1 (1.5 m or less), and is excavated as a preliminary preparation before the entire cut groove 2 is formed. This D1 dimension is a height difference in which a worker is not obligated to wear a safety belt in preparation for falling or the like in accordance with laws and regulations.

  Next, as shown in FIG. 3, the sheet piles 3 for earth retaining are driven on both sides in the width direction of the first cut groove 2a. This sheet pile 3 is of a length that covers the entire length from the opening of the first cut groove 2a to the dimension D2 that is further drilled. The sheet pile 3 may be driven before forming the first cut groove 2a.

  After placing this sheet pile 3, the fall prevention fence of this invention is installed in the both sides of the width direction of opening of the 1st cut groove 2a. More specifically, first, the horizontal arm members 10 and 10 are symmetrically arranged on both sides of the opening edge of the first cut groove 2a so as to face each other in the width direction. Next, the hydraulic cylinders 20 (fixing means 20) for pressing the horizontal arm members 10, 10 in the width direction are attached to the respective opening edges. The hydraulic cylinder 20 is generally used for the purpose of the cut work, and is arranged over the entire length of the width dimension W1 of the first cut groove 2a. The support columns 30 and 30 are erected within a dimension W2 that is wider than the vehicle width dimension of the heavy machinery 6 and smaller than the width dimension of one lane section of the road 1. The support columns 30 and 30 are attached to support column receivers 13 provided at the outer ends of the horizontal arm members 10 and 10 in the width direction. The detailed structure of the horizontal arm member 10 described above will be described later.

  As shown in FIG. 5, the horizontal arm member 10, the hydraulic cylinder 20, and the support column 30 are provided at an interval L <b> 1 (about 4 m) with respect to the traveling direction of the road. Moreover, the cross beam 40 is attached substantially horizontally so that the adjacent support | pillars 30 and 30 arrange | positioned spaced apart in this driving | running | working direction may be connected. The fall prevention fence of the present invention is constituted by the horizontal arm member 10, the hydraulic cylinder 20, the support column 30, and the cross beam 40.

  Here, in this embodiment, the column 30 and the cross beam 40 are round single pipes that are generally used in construction sites. For fixing the support column 30 and the cross beam 40, a general single tube clamp (not shown) that can freely adjust the fixing angle is used. In FIG. 5, the horizontal beams 40 are attached alternately in the running direction (in a staggered manner), but a plurality of single pipes are jointed in the longitudinal direction to make one single pipe apparent. You may make it attach to the support | pillar 30. FIG.

  Moreover, since each of the horizontal arm member 10, the hydraulic cylinder 20, the support column 30, and the cross beam 40 constituting the fall prevention fence has a weight that can be transported by one person or two persons, use a heavy machine. Compared with the case of carrying, the fall prevention fence can be installed in a shorter time. In particular, the horizontal arm member 10 has a weight of about 20 to 30 kg in order to increase the strength when the heavy machinery 6 rides on, but the structure is devised so that it can be transported by one person ( The detailed structure will be described later).

  After the fall prevention fence is installed, as shown in FIG. 1, the first excavation groove 2 a is further excavated using the heavy machinery 6, and is further excavated to the D2 dimension (second excavation groove 2 b). At this time, as shown in FIGS. 1 and 3, the heavy machinery 6 travels in such a manner as to straddle the opening of the first cut groove 2 a in the width direction. The crawler 6a of the heavy machine 6 can perform the excavation work at a desired position while moving freely in the traveling direction while getting over the horizontal arm member 10 of the fall prevention fence. Further, as shown in FIG. 5, the heavy machinery 6 can perform a cutting operation by inserting a bucket into the first cutting groove 2 a from between the hydraulic cylinders 20 arranged at intervals of L <b> 1 in the traveling direction. Thereby, the cut groove 2 (first cut groove 2a + second cut groove 2b) is completed.

  During the operation of digging up the second cut groove 2b, or after the completion of the second cut groove 2b, as shown in FIG. Replacement work is performed. The depth of the cut groove 2 at this time exceeds D1 and becomes D1 + D2 (1.5 m or more), and reaches the height difference that an operator is obliged to wear a safety belt in preparation for falling according to the law. . Therefore, the worker 50 above the opening performs work by attaching a safety band (lifeline) to the cross beam 40. This eliminates the risk of falling or falling for those who work outside the opening of the cut groove 2 and ensures safety.

  In addition, when digging up this 2nd cut groove 2b, as shown in FIG.1 and FIG.5, it will carry out, providing the cut beam 5 suitably as needed at various sites. As shown in FIG. 5, the pitch of the beam 5 in the traveling direction is about ½ (about 2 m) of the pitch L1 of the horizontal arm member 10 of the fall prevention fence, and is almost below the horizontal arm member 10. By arranging the cut beam 5, the cutting work in the heavy machine 6 is not hindered. Further, the length L2 of one of the various pipes 4 is about 6 m, and if the distance L1 (about 4 m) described above, the various pipes 4 are not hindered from being carried in and out obliquely.

  When the installation of the various pipes 4 is completed, the cut groove 2 is backfilled in the reverse procedure.

Next, the structure of the horizontal arm member 10 will be described in detail with reference to FIGS.
6 is a front view of the horizontal arm member 10 as seen from the viewpoint of FIG. 1, FIG. 6 (A) shows a state when used, and FIG. 6 (B) shows a state during transportation and storage. Is shown. FIG. 7 is a plan view of the horizontal arm member 10, and FIG. 8 is a right side view of FIG. 6 (A). Further, FIG. 9 is an exploded view of a portion X in FIG.

  The horizontal arm member 10 is attached to the opening of the cut groove 2 shown in FIG. 1 symmetrically, and has the same configuration. In the following description, only the horizontal arm member 10 located on the left side of the opening will be described.

  As shown in FIGS. 6 to 8, the horizontal arm member 10 includes a crawler ride-up portion 11 formed in a flat plate shape and a fixing portion 12. The crawler riding-up portion 11 and the fixed portion 12 are rotatable from an attached state (FIG. 6A) to a storage body (FIG. 6B) around a rotation shaft 15 extending in the traveling direction. It is attached. Further, as shown in FIG. 1, in a state where the horizontal arm member 10 is attached to the opening edge, the crawler riding-up portion 11 comes into contact with the road surface of the opening edge, and the fixing portion 12 is a groove in the opening edge. It comes in contact with the inner surface (surface of the sheet pile 3).

  The length in the width direction of the crawler ride-up portion 11 is formed to be long so as to reach from the opening edge of the first cut groove 2a to the outside in the width direction of the heavy machine 6 as shown in FIG. Further, the crawler riding-up portion 11 is formed in such a manner that a certain amount of width is given in the traveling direction and the thickness of the steel plate is given in order to ensure a predetermined strength. This strength refers to a strength that does not deform even if the heavy machinery 6 rides and travels, and does not break even if the operator's total weight acts on the cross beam 40.

  Further, as shown in FIGS. 6 and 7, the crawler ride-up portion 11 has chamfers 11 c and 11 c at both upper corners in the traveling direction. This chamfer 11c is intended to make it difficult for an operator to trip through the crawler riding section 11 with this thickness. Moreover, the function which relieves the impact when the crawler 6 rides on the crawler riding part 11 is also fulfill | performed.

  A column support 13 is provided at the outer end in the width direction of the crawler riding section 11 so that the horizontal arm member 10 is positioned outside the heavy machine 6 in the vehicle width direction with the horizontal arm member 10 fixed to the first cut groove 2a. ing. The column support 13 is formed in a hollow cylindrical shape, and is firmly attached by welding so that the opening of the hollow portion faces upward. Further, a reinforcing rib 13 a for increasing bending rigidity is provided on the side of the cut groove 2 in the width direction of the column support 13. A support column 30 is vertically inserted into the hollow portion of the support column receiver 13, and the support column 30 is firmly fixed by pressing its side surface with a jack bolt.

  A rotating handle 14 for transporting the horizontal arm member 10 is provided near the column support 13. The pivot handle 14 is pivotally attached by two pivot support portions 14a, 14a that are spaced apart on both sides in the traveling direction, and pivots up and down to a position that is easy for an operator to carry. It can be done.

  Further, as shown in FIG. 7, a fitting long hole 11 a penetrating in the vertical direction is formed in the middle and slightly right side of the crawler riding-up portion 11. The head of a fitting screw 18 to be described later is inserted into the fitting long hole 11a.

  As shown in FIG. 6 (A), the fixed portion 12 extends downward from the rotation shaft 15 in a state of being substantially perpendicular to the crawler riding-up portion 11 in the use state. A rotating handle 16 is attached to the upper side of the fixed portion 12.

  As shown in FIG. 9, the rotation handle 16 is rotatably attached to the rotation shaft 15 via a bearing 16b. Further, bearings 11 b and 12 b are also provided at the right end portion of the crawler ride-up portion 11 and the upper end portion of the fixed portion 12. The rotating shaft 15 is inserted through the bearings 11b, 12b, 16b and the flat seat 19a, and then the male screw 15a is fixed by double nuts 19b, 19b. Thereby, the crawler riding-up part 11, the fixing | fixed part 12, and the rotation handle 16 can rotate now with respect to the rotating shaft 15, respectively independently.

  In addition, at a portion below the center of the fixed portion 12, the base 17 projects so as to protrude inward in the width direction of the cut groove 2 with the horizontal arm member 10 attached to the opening edge of the cut groove 2. Is provided. The pedestal 17 is for temporary placement when the hydraulic cylinder 20 is attached. More specifically, the hydraulic cylinder 20 is operated in a state where the hydraulic cylinder 20 is placed on the upper surface of the pedestal 17, and the surface above the center of the fixed portion 12 is pressed in the width direction by the hydraulic cylinder 20. Become.

  Further, as shown in FIG. 6A and FIG. 8, a fitting screw mounting plate 12a is provided at the lower end portion of the fixing portion 12, and the head of the fitting screw 18 is located outside in the width direction (crawler). It is attached in such a manner as to protrude to the riding-up portion 11 side.

  As shown in FIG. 6B, the horizontal arm member 10 can fold the fixing portion 12 upward during transportation or storage. More specifically, from the state of use of FIG. 6A, the fixing portion 11 is rotated and folded until it is substantially parallel to the horizontal arm member 10, and the head of the fitting screw 18 is fitted into the fitting long hole 11a. And the fitting screw 18 is fixed by rotating it about 90 degrees. This state is the transport / storage state shown in FIG. By this. The horizontal arm member 10 has a substantially flat and compact outer shape by a simple operation, and can be transported and stored with a stable center of gravity.

  Further, as shown in FIG. 6B, the height H from the upper surface of the crawler ride-up portion 11 to the upper end of the column support 13 and the height H from the lower surface of the crawler ride-up portion 11 to the lower end of the pedestal 17 are approximately. It is comprised so that it may become the same height. As a result, when the plurality of horizontal arm members 10 are stacked and stored vertically, each horizontal arm member 10 can be kept in a substantially parallel state, so that it is difficult to collapse and can be stored in a space-saving manner. Become. It should be noted that the above-described height H being substantially the same does not mean that the heights are completely the same, but when the plurality of horizontal arm members 10 are stacked one above the other, the horizontal arm members 10 are parallel to such an extent that they do not easily collapse. It means that it is height.

A drop prevention fence having such a structure was experimentally installed and a load test was performed.
As a result of connecting a weight having a weight of 70 to 80 kg (corresponding to the body weight of the operator) to the cross beam 40 via the safety belt 52 and dropping it into the cut groove 2, the column 30 and the cross beam 40 are slightly deformed. Although there was distortion, it was confirmed that the weight could be supported. The distance L1 in the traveling direction of the support columns 30 at this time is 4 m, and it is scheduled to be further improved so that this distance can be increased.

  Further, when a test was carried out in which the heavy machine 6 was mounted on the crawler riding part 11 of the installed horizontal arm member 10 and moved, there was no influence on the installation part of the hydraulic cylinder 20 or the strength effect of the horizontal arm member 10. It was confirmed that the heavy machinery 6 can be moved without any problem.

  According to the fall prevention fence according to the embodiment of the present invention, the heavy machine 6 that is attached to the opening edge of the cut groove 2 and extends along the road surface to the outer side in the width direction of the cut groove 2 rides upward. A horizontal arm member 10 provided with a column support 13 positioned outside the vehicle width of the heavy machine 6 and a hydraulic cylinder 20 installed in the cut groove 2 and pressing the horizontal arm member 10 outward in the width direction; In addition, since it is provided with the support column 30 standing on the support column 13 and the cross beam 40 attached over the adjacent support column 30 in the traveling direction of the road 1, it does not require a large installation space and can be installed in a short time. Possible fall prevention fences can be provided.

  More specifically, when the column 30 has a structure different from that of the fall prevention fence of the present invention and is intended to stand up firmly with a structure only outside the heavy machine 6, the structure for receiving the column is large and It becomes a considerable weight. This requires a large installation space and does not fit in the construction space in one lane. On the other hand, as in the present invention, the horizontal arm member 10 is pressed and fixed using the hydraulic cylinder 20 using the cut groove 2, while the support 30 is erected outside the heavy machine 6 with this fixing force. The fall prevention fence does not require a large space for installation. Therefore, it is possible to provide a fall prevention fence that fits in the construction space in one lane.

  Moreover, when it is going to install the support | pillar 30 firmly with the structure only of the outer side of the heavy machine 6, it is necessary to convey a heavy fall prevention fence using a heavy machine. On the other hand, since the horizontal arm member 10, the hydraulic cylinder 20, the support column 30, and the cross beam 40 constituting the fall prevention fence of the present invention are heavy enough to be transported by human power, they can be easily installed and recovered in a short time. it can. For this reason, it can be used even on the site where there is a request for restoration on the same day, and even in such a short time construction, it is possible to proceed while ensuring the safety of the worker on the road 1.

  Furthermore, since the heavy machine 6 can travel above the crawler ride-up part 11 of the horizontal arm member 10, even after the fall prevention fence is installed, further excavation work can be performed using the heavy machine 6. For this reason, the heavy machinery 6 can be used as needed, so that the excavation process can be further shortened. In addition, it is possible to prevent the operator from falling during the excavation work with the heavy machinery 6.

  Further, the horizontal arm member 10 includes a crawler riding part 11 and a fixing part 12 connected to an end in the width direction of the crawler riding part 11, and the fixing part 12 is located below the opening edge of the cut groove 2. Since the fixing portion 12 is pressed in the width direction by the hydraulic cylinder 20, the horizontal arm member 10 can be configured with a simple structure, and the opening edge portion can be formed in a short time. Can be installed and fixed.

  Furthermore, since the crawler riding part 11 and the fixing | fixed part 12 are connected so that rotation is possible, the horizontal arm member 10 is folding until the crawler riding part 11 and the fixing | fixed part 12 become a substantially parallel state. The operator can carry and store the horizontal arm member 10 in a compactly folded state. Moreover, since the center of gravity is stabilized when the horizontal arm member 10 is transported, one or two workers can be transported manually.

  Furthermore, the fixed portion 12 is provided with a pedestal 17 that protrudes inward in the width direction of the cut groove 2 with the horizontal arm member 10 attached to the cut groove 2. Since the height and the height of the pedestal 17 of the fixed portion 11 are substantially the same, when the plurality of horizontal arm members 10 are folded and stacked one above the other, these horizontal arm members 10 are brought into a substantially horizontal state. be able to. Therefore, since it can be piled up stably when storing, it becomes difficult to cause a load collapse or the like. Moreover, since it can be stacked compactly, it can be stored in a small space.

  According to the excavation work method using the fall prevention fence according to the embodiment of the present invention, after the operator has previously excavated the first excavation groove 2 a having a depth that does not require the safety belt 52, the first excavation groove 2 a A fall prevention fence is fixed to the opening edge, and the heavy machine 6 is moved to a predetermined position while traveling on the upper side of the horizontal arm member 10 of the fall prevention fence. While the cut groove 2b is further cut, the worker 50 working outside these cut grooves 2 attaches the safety band 52 to the fall prevention fence to perform the work, so after installing the fall prevention fence However, the second cut groove 2b can be further deeply dug using the heavy machinery 6 in one lane. Moreover, even if the depth of the cut groove 2 exceeds the depth that requires the safety belt 52, the worker 50 on the road 1 can safely work by attaching the safety belt 52 to the fall prevention fence. Can do.

Although the fall prevention fence according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. .
For example, in the present embodiment, a round single tube pipe is used as the cross beam 40, but instead of the single tube pipe, a master rope having a predetermined strength is stretched between adjacent struts 30. It can be installed to form a fence. In the present invention, it is assumed that the cross beam 40 includes all of the above-described master rope, including the single pipe pipe, and other members that are attached as strength members across the adjacent struts 30.

  The hydraulic cylinder 20 may be pneumatic, hydraulic, etc. in addition to hydraulic pressure, and any hydraulic cylinder 20 can be used as long as it can press and fix the fixing portion 12 in the width direction by pressing the fixing portion 12 in the width direction. Such a fixing means may be used. In the present invention, these are collectively referred to as a fixing means 20.

  Furthermore, although the fall prevention fence which provided the support | pillar 30 and the cross beam 40 in the both sides of the width direction of the heavy machine 6 is described in this Embodiment, the horizontal arm member 10 and the support | pillar 30 are provided only in either one side instead of both sides. Alternatively, the cross beam 40 may be provided. For example, when there is a building wall or the like on one side and the column 30 cannot be erected, the column 30 or the like is erected only on the other side.

  On the other hand, in the embodiment of the present invention, the structure of the present application has been described as a “fall prevention fence”. However, as a matter of course, as an “entry prevention fence” that prevents a passer other than the construction worker from entering the construction space. Can also be used. In other words, the present invention is useful not only in ensuring safety against the fall of a construction worker, but also in ensuring safety of ordinary people.

  Moreover, even if the depth D1 + D2 of the cut groove 2 is shallow (depth less than 1.5 m), the fall prevention fence of the present invention may be provided. Although the law does not obligate you to wear a safety belt, you can easily install and collect a fence, so you can improve safety by wearing a safety belt with a fence. In addition, even if it is shallow, it is also useful as the above-mentioned “entrance prevention fence”, so that pedestrians and bicycles passing on the sidewalk will not accidentally enter the construction space and fall into the excavation groove 2. By doing so, safety can be further improved.

DESCRIPTION OF SYMBOLS 1 Road 2 Cutting groove 2a 1st cutting groove 2b 2nd cutting groove 3 Sheet pile 4 Various piping 5 Cutting beam 6 Heavy machinery 6a Crawler 10 Horizontal arm member 11 Crawler riding-up part 11a Fitting long hole 11b Bearing 11c Chamfering 12 Fixed part 12a Fitting Screw mounting plate 12b Bearing 13 Post support 13a Reinforcement rib 14 Rotating handle 14a Rotating support 15 Rotating shaft 15a Male screw 16 Rotating handle 16b Bearing 17 Base 18 Fitting screw 19a Flat seat 19b Nut 20 Hydraulic cylinder (fixing means)
30 Struts 40 Cross beams 50 Workers inside the cut groove 51 Workers outside the cut groove 52 Safety belts D1, D2 Depth of the cut groove W1 Width of the cut groove W2 Width of the fall prevention fence L1 Spacing between adjacent columns L2 Various Length per pipe H Height of column support or pedestal

Claims (5)

A fall prevention fence used for excavation work that performs excavation along the traveling direction of a road using heavy machinery, and prevents an operator on the road from falling into an excavation groove,
It is attached to the opening edge of the cut groove, extends along the road surface to the outer side in the width direction of the cut groove, and is positioned outside the vehicle width of the heavy machine when the heavy machine that travels rides on the upper side. A horizontal arm member provided with a column support;
Fixing means installed in the cut groove and pressing the horizontal arm member outward in the width direction;
A column erected on the column support;
A transverse beam attached across the struts adjacent in the direction of travel of the road;
A fall prevention fence characterized by comprising   The horizontal arm member has a crawler riding portion and a fixing portion connected to an end portion in the width direction of the crawler riding portion, and the fixing portion is disposed downward from an opening edge portion of the cut groove. The fall prevention fence according to claim 1, wherein the fixing portion is pressed in the width direction by the fixing means.   The horizontal arm member is configured such that the crawler riding part and the fixing part are rotatably connected, and can be folded until the crawler riding part and the fixing part are in a substantially parallel state. The fall prevention fence of Claim 2 to do.   The fixed portion is provided with a pedestal that protrudes inward in the width direction of the cut groove, with the horizontal arm member attached to the cut groove, and the height of the column support of the crawler riding portion, The fall prevention fence according to claim 3, wherein the height of the pedestal of the fixed portion is formed to be substantially the same. When performing excavation along the traveling direction of the road using heavy machinery, it is an excavation work method performed using the fall prevention fence according to any one of claims 1 to 4,
After the operator has previously opened the first cut groove having a depth that does not require a safety belt, the fall prevention fence is fixed to the opening edge of the first cut groove, and the heavy machine is connected to the horizontal arm of the fall prevention fence. While moving the upper side of the member to move to a predetermined position, the operator further cuts the second cut groove having a depth that requires a safety belt, while the worker working outside the cut groove drops the drop. An excavation method using a fall prevention fence, which is characterized by attaching a safety belt to the prevention fence.

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