JP2023044926A - Fall preventive measure structure for driver or the like outside of guard fence and fall preventive measure construction method - Google Patents

Abstract

To provide a fall preventive measure structure and a fall preventive measure construction method for an evacuation and inspection passage for allowing a driver or the like to temporarily evacuate to the outside of a guard fence when an accident or the like occurs on a highway.SOLUTION: In a fall preventive measure structure for a driver or the like outside of a guard fence and a fall preventive measure construction method, an evacuation and inspection passage is constituted of a frame and a tread to secure a necessary width as the inspection passage, and a fall prevention fence is arranged at a slope tail side end part of the evacuation and inspection passage by securing separation from a guard fence so as not to inhibit a function of the guard fence, the slope tail pile and a slope shoulder pile in a road crossing direction are arranged at a predetermined interval in a road longitudinal direction in a lower part of the evacuation and inspection passage, and the frame is supported by each pile head part of the slope tail pile and the slope shoulder pile, the treads are supported between frames arranged at predetermined intervals in the longitudinal direction of the road to constitute an evacuation and inspection passage, and a pipeline space is provided below the evacuation and inspection passage.SELECTED DRAWING: Figure 2

Description

If an accident or breakdown occurs on the expressway and the driver, etc. gets off, evacuate to the outside of the protective fence (guardrail). If the evacuation destination outside the protective fence has no width and the height above the ground surface is high due to a structure close to a retaining wall or a straight wall made of concrete blocks, a fall prevention fence is required to prevent drivers from falling. . BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention structure and a fall prevention construction method for preventing an evacuated driver or the like from falling, provided outside a protective fence on a highway.

If an accident or a breakdown occurs on an embankment-structured expressway and the driver or other person needs to get off, they are supposed to evacuate to the outside of the protective fence on the opposite side of the expressway. In the case of expressways with an embankment structure, the area outside the protective fence is a passage for inspection (hereinafter referred to as an inspection passage), and fall prevention fences are known to prevent falls, but fall prevention fences are not necessarily Not provided. In addition, in the case of a high embankment structure, the outer side of the protective fence is a retaining wall or concrete block pile that is close to a straight wall immediately from the inspection passage, and the height from the ground surface is high and it may be a dangerous place. On the other hand, if a fall prevention fence is installed in a narrow passageway, maintenance and inspection work such as cleaning and equipment replacement will be hindered by the presence of the fall prevention fence, making it difficult to do the work and not enough work space. There is a problem that it cannot be secured. In addition, when there is a lot of snowfall, the installation of the fall prevention fence tends to accumulate snow, and it is difficult to remove the snow, so there is a problem that the function as an inspection passage is likely to be impaired.

For the structure of the fall prevention fence, refer to "Classification P" in "Section 5, Chapter 1, 1-4 Pedestrian and Bicycle Fences" of "Protection Fence Installation Standards and Commentary (December 2016) Japan Road Association". Designed accordingly. See Non-Patent Document 1. According to the installation standards and explanations for the above protective fences, the posts of the fall prevention fence should be supported by concrete foundations with a specified embedding depth or by piles that are extensions of the posts, with a margin on the side of the slope.

The collapsible fence 1 of Patent Document 1 is installed at the upper end of the concrete support A on the slope S, and the installation of the fall prevention fence described above facilitates maintenance and inspection work such as cleaning and equipment replacement. In order to prevent it from becoming an obstacle, it is made into a foldable fence. The anti-fall fence needs to ensure a passage width for drivers, etc., and a predetermined separation distance that does not hinder the function of the protective fence. In some cases, it has a partially overhanging structure. Patent document 2 is by the applicant of the present invention, but the overhang sidewalk 21 is installed on the opposite side of the roadway 29 from the buried foundation 6 immediately below the roadside guardrail 33 in FIG. Fall prevention fences are installed in some areas. Further, in Patent Document 3, a sidewalk concrete slab 3 having a role of a sidewalk on one side is installed on the ground, and a guard pipe 12 corresponding to a fall prevention fence is attached to one side end of the sidewalk concrete slab. erected

As for supporting by piles that are extensions of the posts of the fall prevention fence, Patent Document 4 discloses a guard pipe fence post 5 as a sidewalk safety fence, and a spiral plate 2 at the lower end of the shaft 1. It is described that it was supported by pillars erected in the ground.

JP 2015-178758 A Japanese Patent Application Laid-Open No. 2018-21300 JP 2014-43755 A JP-A-2000-273833

Safety fence installation standards and commentary (December 2016) Japan Road Association Vol.

If an accident or a breakdown occurs on an embankment-structured expressway and the driver or other person needs to get off, they are supposed to evacuate to the outside of the protective fence on the opposite side of the expressway. However, although there is an inspection passage outside the protective fence, there is not necessarily a fall prevention fence. Because of the concrete block construction, the height above the ground surface is high, and a fall prevention fence is required to prevent the evacuated driver from falling. On the other hand, if a fall prevention fence is installed in a narrow passageway, maintenance and inspection work such as cleaning and equipment replacement will be hindered by the presence of the fall prevention fence, making it difficult to do the work and not enough work space. In addition, when there is a lot of snowfall, the installation of fall prevention fences tends to accumulate snow and makes it difficult to remove snow, so there is a problem that the function as an inspection passage is likely to be impaired.

In Patent Document 1, a fence 1 is installed on the side of a passage P on a slope S where there is a danger of falling, and in order to avoid the fence 1 becoming an obstacle during maintenance and inspection work, the passage P is moved as necessary. It is a collapsible type that falls to the outside. The collapsible fence 1 is installed at the upper end of the concrete support A on the slope S. The concrete support A installed on the slope S supports the collapsible fence 1. A basic structure is required. In Patent Document 2, the overhang sidewalk 21 is installed on the opposite side of the roadway 29 from the buried foundation 6 directly below the guardrail 33 on the side of the roadway, and the fall prevention fence 34 is installed at the tip of the overhang sidewalk 21. , the buried foundation supporting the overhang sidewalk 21 must be a large-scale foundation structure. In Patent Document 3, a sidewalk concrete slab 3 is installed on the ground, and a guard pipe 12 equivalent to a fall prevention fence is erected at one end of the sidewalk concrete slab. The ground on which the sidewalk concrete slab 3 is installed is necessary, and there is a problem that the ground on which the sidewalk concrete slab 3 is installed must be secured on the shoulder of the embankment where there is only limited support ground. Patent Document 4 describes a structure in which a guard pipe fence post 5 as a sidewalk safety fence is supported by an underground pillar provided with a spiral plate 2 at the lower end of the shaft 1. There is no description about the configuration of installing an inspection passage on the shoulder of the slope and installing a fall prevention fence.

In view of such problems of the prior art, the present invention has been developed as a fall prevention measure for shunting drivers and the like who also have an inspection passage outside the protective fence in the embankment of the expressway.
(a) "Standards and commentary on the installation of protective fences (December 2016) Satisfy "Type P" of "pedestrian and bicycle fences" of the Japan Road Association and do not impede the function of protective fences. To provide a fall prevention countermeasure structure and a fall prevention countermeasure construction method that secures a distance of 1.1 m or more from a protective fence,
(b) The inspection passage to be installed between the fall prevention fence and the protection fence should be 0.6 m or more in width, considering the movement of evacuated drivers, etc., and equipped with a passage that prevents snow from accumulating and that is easy to remove. To provide a countermeasure structure and fall prevention countermeasure construction method,
(c) To provide a fall prevention countermeasure structure and a fall prevention countermeasure construction method that enable relocation and storage of communication conduits buried around inspection passages;
(d) To provide a fall prevention countermeasure structure and a fall prevention countermeasure construction method that are designed to reduce the weight of the structure and make it a structure and construction method that is easy to install in a narrow section of an embankment of a highway;
(e) To provide a fall prevention structure and a fall prevention construction method that minimizes slope excavation by maintaining the slope disaster prevention strength by installing a fall prevention fence;
It is intended for

In order to solve the above-mentioned problems, the present invention (claim 1) provides a system for "when an accident or breakdown occurs on a highway with an embankment structure, the driver or the like gets off and temporarily evacuates to the outside of the protective fence. An evacuation and inspection passage used for inspection, the evacuation and inspection passage is composed of a pedestal and a tread, ensuring the necessary width as an inspection passage, and a fall prevention fence so as not to hinder the function of the protective fence. The distance from the protective fence is secured, and it is arranged at the end of the toe side of the evacuation and inspection passage. Arranged at predetermined intervals in the longitudinal direction to support the evacuation and inspection passageway, and provided with a pipeline space below the evacuation and inspection passageway, preventing a driver from falling outside the protective fence. Countermeasure structure."

By arranging the fall protection fence at the end of the toe side of the evacuation/inspection passage formed by the pedestal and treads, the distance from the protection fence is secured so as not to impede the function of the protection fence, and the evacuation/inspection passage is also used. secures the necessary width as an inspection passage, and furthermore, by arranging trailing piles and slope shoulder piles at the end of the slope side of the inspection passage that also serves as an evacuation and on the slope shoulder, Commentary (December 2016) This is a structure that prevents drivers from falling outside the protective fence, which satisfies the installation standards for "pedestrian and bicycle fences" set by the Japan Road Association. In addition, a pipeline space is provided below the evacuation and inspection passageway, and it is a structure that prevents the driver from falling outside the protective fence. In addition, by forming an evacuation and inspection passage with a pedestal and treads, and supporting and fixing the evacuation and inspection passage with trailing piles and shoulder piles driven into the slope, the weight of the structure can be reduced and the expressway can be constructed. A structure that does not excavate or backfill the slope in a narrow part of the embankment, and as a result, the slope disaster prevention strength is maintained and the slope modification is minimized. It is a preventive measure structure.

According to the present invention (claim 2), "the mounting frame is composed of a T-shaped metal fitting and used in an inverted T shape, and between the pile heads of the toe pile and the shoulder pile in the road crossing direction, the reverse The protection according to claim 1, characterized in that the treads are supported and fixed in a T-shape, and the footboards are supported and fixed between the inverted T-shaped pedestals arranged at predetermined intervals in the longitudinal direction of the road. It is characterized by a structure that prevents the driver from falling outside the fence.

The "metal fitting" according to the present invention is a member made of a known metal, and according to the required performance, known metals such as stainless steel, anticorrosion-treated steel, or normal steel can be used. Weight reduction is achieved by configuring the frame with T-shaped metal fittings, and the T-shaped metal fittings are used in an inverted T shape, and between the pile heads of the toe pile and the shoulder pile in the road crossing direction, in an inverted T shape By fixing the treads between the inverted T-shaped pedestals that are arranged and supported and fixed at predetermined intervals in the road longitudinal direction, the structure is made continuous, rigid, and lightweight, and the embankment of the expressway It is a structure that can be easily installed in a narrow space, and is a structure that prevents the driver from falling outside the protective fence.

The present invention (Claim 3) is characterized in that "according to the inclination of the slope, the shoulder pile uses a pile shorter than the toe pile, and the toe pile and the shoulder pile are spiral piles. A structure for preventing a driver or the like from falling outside the protective fence according to any one of claims 1 and 2."

The "spiral pile" according to the present invention is a known pile that has a spiral blade at the tip of the pile and is driven into the ground while rotating. The slope piles placed on the shoulder side of the slope should be shorter than those placed at the toe of the slope. By using spiral piles for the tail piles and slope piles, we have strengthened the bearing capacity and reduced the weight of the structure. It is a fall prevention countermeasure structure.

The present invention (Claim 4) is defined as follows: "The pipeline space provided below the evacuation and inspection passage is composed of cable racks that are enclosed on three sides and incorporated into the footboards, and pipes are arranged in the cable racks. A structure for preventing a driver or the like from falling outside the protective fence according to any one of claims 1 to 3, characterized by:

The pipeline space provided below the evacuation and inspection passage is configured with a three-sided enclosure cable rack. This is a structure that can be easily installed in a narrow section of the road embankment to prevent the driver from falling outside the protective fence.

The present invention (Claim 5) is "an evacuation and inspection passage that is usually used for inspection, in order to temporarily evacuate to the outside of the protective fence when an accident or breakdown occurs on an embankment-structured expressway. The toe piles and the shoulder piles in the road crossing direction of the embankment slope are driven at predetermined intervals in the road longitudinal direction, and the mounting frame is placed on the toe piles and the shoulder piles in the road crossing direction. Between the pile heads, it is constructed at the predetermined intervals in the longitudinal direction of the road, and a tread plate having a pipeline space below is constructed between the pedestals constructed at the predetermined intervals to form an evacuation and inspection passage. A fall prevention fence is provided at the toe side end of the evacuation/inspection passage while securing a necessary width as an inspection passage while maintaining a distance from the protection fence so as not to hinder the function of the protection fence. A construction method for preventing the fall of drivers, etc. outside the protective fence, which is characterized by

A fall protection fence is provided at the end of the trailing side of the inspection passage that is also used as an evacuation, securing the necessary width as an inspection passage while maintaining a distance from the protection fence so as not to hinder the function of the protection fence, and embankment. By driving the trailing piles and slope piles in the road crossing direction on the slope at predetermined intervals in the road longitudinal direction, it is possible to comply with the "Protective Fence Installation Standards and Commentary (December 2016) Japan Road Association". This method meets the installation standards for "pedestrian and bicycle fences" and prevents drivers from falling outside the protective fence. In addition, a pipeline space is provided below the evacuation and inspection passage, which is a construction method to prevent drivers from falling outside the protective fence. Furthermore, by constructing the treads between the pedestals erected at predetermined intervals to form an inspection passage that also serves as an evacuation, and furthermore, by supporting the passage that also serves as an evacuation and inspection with trailing piles and slope piles driven into the slope. , It is an easy construction method that does not require excavation and backfilling of slopes in narrow areas of expressway embankments. This is a construction method to prevent drivers from falling outside the fence.

The present invention (Claim 6) provides that "the pedestal is composed of a T-shaped metal fitting and used in an inverted T shape, and between the pile heads of the toe pile and the shoulder pile in the road crossing direction, the reverse The protection according to claim 5, characterized in that the treads are supported and fixed between the inverted T-shaped pedestals that are erected in a T shape and supported and fixed at predetermined intervals in the longitudinal direction of the road. It is characterized by a construction method to prevent drivers from falling outside the fence.

The "metal fitting" according to the present invention is a member made of a known metal, and according to the required performance, known metals such as stainless steel, anticorrosion-treated steel, or normal steel can be used. Weight reduction is achieved by configuring the frame with T-shaped metal fittings, and the T-shaped metal fittings are used in an inverted T shape, and between the pile heads of the toe pile and the shoulder pile in the road crossing direction, in an inverted T shape The treads are supported and fixed between the inverted T-shaped pedestals that are erected and supported and fixed at predetermined intervals in the longitudinal direction of the road. This is a construction method to prevent drivers from falling outside the protective fence.

The present invention (Claim 7) is characterized in that "according to the inclination of the slope, the shoulder pile uses a pile shorter than the toe pile, and the toe pile and the shoulder pile are spiral piles. , a construction method for preventing a driver or the like from falling outside the protective fence according to any one of claims 5 and 6."

The "spiral pile" according to the present invention is a known pile that has a spiral blade at the tip of the pile and is driven into the ground while rotating. According to the slope slope, the piles driven on the shoulder side of the slope use shorter piles than the piles driven on the bottom of the slope, and the length of the piles is minimized according to the height of the slope. In addition, by making the trailing pile and the trailing pile a spiral pile, it is easy to install in a narrow place on the embankment of the expressway. Construction method.

The present invention (Claim 8) provides that "the conduit space provided below the evacuation/inspection passage is composed of cable racks that are enclosed on three sides and are incorporated in the footboards, and pipes are arranged in the cable racks. A construction method for preventing a driver or the like from falling outside the protective fence according to any one of claims 5 to 7, characterized by:

The pipeline space provided below the evacuation and inspection passage is configured with a three-sided enclosure cable rack, and the cable rack is provided below the tread and the pipeline is arranged to reduce the weight of the structure. This is a construction method that can be easily installed in a narrow area of an embankment of an expressway to prevent a driver from falling outside the protective fence.

By arranging the fall protection fence at the end of the toe side of the inspection passage that also serves as an evacuation, which is formed by a pedestal and treads, it is necessary as an inspection passage while keeping a distance from the protection fence so as not to hinder the function of the protection fence. By securing the width and placing the toe piles and the shoulder piles at the end of the toe side of the evacuation and inspection passage and the shoulder of the slope, (December) This is a structure and construction method that satisfies the installation standards for "pedestrian and bicycle fences" set by the Japan Road Association and prevents drivers, etc. from falling outside the protective fences. In addition, a pipeline space is provided below the evacuation and inspection passage, and the evacuation and inspection passage has a continuous and rigid structure with a pedestal and treads. By supporting with shoulder piles, we aim to strengthen the bearing capacity and reduce the weight of the structure, making it a construction method that does not require excavation and backfilling of slopes in narrow areas of expressway embankments. It is possible to provide a structure and construction method to prevent drivers from falling outside the guard fence, which maintains the safety and minimizes slope modification.

Side view of inspection passage outside protective fence without fall prevention fence A side view of an evacuation/inspection passage outside the protective fence and a fall prevention fence installed Front view with an evacuation/inspection passage outside the protective fence and a fall prevention fence installed Side view of the pipeline space provided below the evacuation and inspection passage Construction procedure diagram for installing an evacuation and inspection passage outside the protective fence

Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, in the road crossing direction perpendicular to the driving direction of the embankment structure expressway, the side opposite to the driving lane with respect to the guard fence is called "outside". On a slope in the cross-road direction, the toe of the slope is called the "bottom of the slope" and the top of the slope is called the "shoulder", which are used to indicate the position in the cross-road direction. The direction of travel on an expressway is called the longitudinal direction of the road, and it is used to indicate locations. In addition, the "lower" and "lower" sides of the evacuation/inspection passageway are used to indicate the positions, and the back side of the evacuation/inspection passageway opposite to the side of the passageway is referred to as "lower".

FIG. 1 is a side view of an inspection passage outside a protective fence without a fall prevention fence. In the event of an accident or breakdown on an embankment-structured expressway and the driver, etc., needs to get off, they are supposed to evacuate to the outside of the guardrail on the opposite side of the expressway. In the case of an embankment-structured expressway, the area outside the protective fence serves as an inspection passage for inspection, and fall prevention fences are known to prevent falls, but fall prevention fences are not necessarily provided. On the other hand, if a fall prevention fence is installed in a narrow passageway, maintenance and inspection work such as cleaning and equipment replacement will be hindered by the presence of the fall prevention fence, making it difficult to do the work and not enough work space. There is a problem that it cannot be secured. In addition, when there is a lot of snowfall, the installation of the fall prevention fence tends to accumulate snow, and it is difficult to remove the snow, so there is a problem that the function as an inspection passage is likely to be impaired.

In view of such problems of the prior art, the present invention provides (a) "Protective fence installation standards and commentary (Heisei era (December 2016) Satisfying the "Type P" of the "pedestrian and bicycle fence" of the Japan Road Association, and ensuring a distance of 1.1 m or more from the protective fence so as not to hinder the function of the protective fence.
(b) The inspection passage installed between the fall prevention fence and the protection fence should be 0.6 m or more in width, considering the movement of evacuated drivers, etc., and it should be easy to remove snow and prevent snow from accumulating.
(c) Make it possible to relocate and store the communication conduits buried around the inspection passage,
(d) To reduce the weight of the structure and adopt a structure and construction method that is easy to install in a narrow section of the embankment of the expressway,
(e) It relates to a fall-prevention structure and a fall-prevention construction method that maintains the slope disaster prevention strength by installing a fall prevention fence and minimizes slope excavation.

For this reason, in the structure and method for preventing the fall of drivers outside the guard fence of the present invention, the fall prevention fence 8 is formed at the toe side end of the escape/inspection passage 9 formed by the pedestal 91 and the treads 92. By arranging it on the slope, the distance from the protective fence 5 is secured so as not to hinder the function of the protective fence 5, and furthermore, piles 93 are arranged at the toe side end of the evacuation and inspection passage 9 and on the slope shoulder. By doing so, it satisfies the installation standards for "fences for pedestrians and bicycles" of the "Standards and Commentary on Installation of Protective Fences (December 2016) Japan Road Association" A space 100 is provided, an evacuation/inspection passage 9 is formed by a frame 91 and a tread plate 92, and the evacuation/inspection passage 9 is supported and fixed by piles 93 driven into the slope, thereby reducing the weight of the structure and increasing the speed. The structure and construction method are easy to install in a narrow section of the road embankment, and as a result, the slope disaster prevention strength is maintained and the slope excavation is minimized. and construction method.

As an embodiment of the present invention, the structure of each member that is lightweight and easy to install will be described first in a structure for preventing a driver from falling outside the protective fence. The evacuation/inspection passageway 9 is mainly composed of a fall prevention fence 8 , a pedestal 91 , a tread plate 92 , piles 93 ( 93 A and 93 B), a pipeline space 100 , a cable rack 101 and a pipeline 102 . FIG. 2 shows a side view in which an evacuation/inspection passage 9 is provided outside the protection fence and a fall prevention fence 8 is installed using the above members. The details of each main material of the fall prevention structure and the assembly structure are described below.

The fall prevention fence 8 is arranged at the toe side end of the escape/inspection passage 9 that secures a distance of L = 1100 mm from the protection fence 5 so as not to hinder the function of the protection fence 5. As an example, the handrail height H = 1100 mm beam format. The inspection passage width of the evacuation/inspection passage 9 composed of the pedestal 91 and the treads 92 is ensured to be 0.6 m or more in consideration of the movement of the shunting driver and the like. In addition, the inspection passage 9 also used as an evacuation adopts a tread plate 92 made of aluminum strip plate which prevents snow from accumulating and which is easy to remove.

At the bottom of the evacuation and inspection passage 9, a slope pile 93A is placed on the side of the slope in the road crossing direction, a slope pile 93B is placed on the slope side, and Lp = 2016 mm intervals are arranged in the road longitudinal direction as an example. Then, the evacuation and inspection passage 9 is supported and fixed. The pile 93 is formed as a spiral pile to enhance the bearing capacity. In addition, the slope shoulder pile 93B arranged on the slope side according to the slope slope uses a shorter pile than the slope toe pile 93A arranged on the slope toe, and the length of the pile 93 is minimized by the slope height. We tried to reduce the weight. The bottom pile 93A is, for example, a steel pipe spiral pile having a pile length L of 2500 mm and a pile outer diameter φ of 114 mm. It's a stake. The toe pile 93A and the shoulder pile 93B are helical piles having a helical screw portion at the tip of the pile and a flange portion that can be joined with bolts at the head portion of the pile. See FIGS. 2 and 3.

The mount 91 that constitutes the evacuation and inspection passageway 9 is lightened by adopting, for example, T-shaped steel (100×100×6×8 mm). The frame 91 is used in an inverted T shape, is installed on the flanges of the pile heads of the toe pile 93A and the shoulder pile 93B, and is connected to the flanges of the pile heads with bolts to support and fix. , are arranged at predetermined intervals Lp=2016 mm in the longitudinal direction of the road. When connecting and supporting the pile 93 and the frame 91, a known jig (not shown) is interposed for adjustment in the road cross direction, longitudinal direction and height direction, if necessary. See FIGS. 2 and 3.
It should be noted that each of the above numerical values is an example, and is appropriately selected and used depending on the conditions.

The footboard 92 that constitutes the evacuation and inspection passageway 9 is lightened by adopting, for example, a hollow aluminum box lid shape (length 2000×width 500×height 100 mm). Two treads 92 are arranged in the road crossing direction between the inverted T-shaped pedestals 91 arranged at a predetermined interval Lp = 2016 mm in the road longitudinal direction to ensure a passage width of 0.6 m or more, and bolts are connected and fixed to the pedestal 91. The pedestal 91 is supported and fixed in the road crossing direction by the pile heads of the toe pile 93A and the slope shoulder pile 93B, and the tread plate 92 is supported and fixed between the pedestals 91 arranged at predetermined intervals in the road longitudinal direction. As a result, the structure can be made continuous and rigid in both the cross-road direction and the road-longitudinal direction. See FIGS. 2 and 3.

The pipeline space 100 provided below the evacuation and inspection passage 9 is configured by installing a three-sided enclosure cable rack 101 below the footboard 92 installed on the side of the slope, and the footboard 92 is attached to the frame 91. The cable rack 101 is installed before installation. After the footboard 92 is installed on the frame 91 , the pipeline 102 is arranged on the cable rack 101 . See FIG.

The fall prevention structure described above is also used for evacuation, which is usually used for inspection, in order to temporarily evacuate to the outside of the protective fence 5 by getting off the driver in the event of an accident or breakdown on the embankment-structured expressway 1. In the inspection passage 9, a fall prevention fence 8 is provided at a location that secures a distance from the protection fence 5 so as not to hinder the function of the protection fence 5, and the fall prevention fence 8 is composed of a stand 91 and a footboard 92. In addition, it is arranged at the end of the toe side of the evacuation and inspection passage 9, and at the lower part of the evacuation and inspection passage 9, the toe pile 93A and the shoulder pile 93B in the road crossing direction are arranged at predetermined intervals in the road longitudinal direction. Then, the evacuation and inspection passage 9 is supported and fixed, and a pipeline space 100 is provided below the evacuation and inspection passage 9, thereby preventing the driver from falling outside the protective fence.

Next, as an embodiment of the present invention, in the construction method for preventing a driver from falling outside the protective fence, each construction procedure that is lightweight and easy to install will be described.

The construction procedure for providing the evacuation and inspection passage 9 is
(1) Clearly mark driving positions 93S of the piles 93 on the embankment slope 12 (marking). Figure 5(a)
(2) Driving the bottom pile 93A and the shoulder pile 93B on the embankment slope 12; Fig. 5(b)
(3) Mounting frame 91 is constructed between each pile head of slope shoulder pile 93A and slope shoulder pile 93B. Fig. 5(c)
(4) Install the treads 92 between the pedestals 91 . Fig. 5(d)
(5) placing the pipeline 102 in the pipeline space 100; Fig. 5(e)
(6) A fall prevention fence 8 is installed in the evacuation and inspection passage 9 . Fig. 5(e)
FIG. 5 shows a construction procedure diagram for providing an evacuation and inspection passageway 9 outside the protective fence. Detailed procedures for each work are described below.

<Clarification of pile driving position>
Prior to the driving of the pile 93, the driving position 93S of the pile 93 is clearly indicated on the embankment slope 12. - 特許庁See FIG. 5(a).

<Pile driving>
According to the driving position 93S of the pile 93, the toe pile 93A and the shoulder pile 93B in the road crossing direction are driven at a predetermined interval Lp=2016 mm in the road longitudinal direction as an example. The specifications of the piles 93 are as described in the details of the main members of the fall prevention structure. First, the toe pile 93A in the road crossing direction is driven, and then the shoulder pile 93B is driven. As shown in FIG. 5B, driving is performed by arranging a small backhoe, which is a pile driving machine 200 as an example, on the main road shoulder 3 of the expressway 1, and driving the trailing pile 93A from the main road shoulder 3. And the shoulder pile 93B is driven by rotation. A device for rotating and driving the pile 93 is attached to the tip of the arm of the small backhoe, and the flange portion of the pile head of the pile 93 is clamped and driven by rotation. Then, after the driving of the toe pile 93A and the shoulder pile 93B in the road crossing direction is completed, the pile driving machine 200 is moved along the main road shoulder 3 by the distance between the piles in the road longitudinal direction. The toe pile 93A and the shoulder pile 93B are driven, and the same work is carried out for a predetermined section in the longitudinal direction of the road. In a narrow part of the embankment of the expressway, it is possible to construct the pile 93 as a foundation work from the main track shoulder 3, and it is an easy construction method that does not require excavation and backfilling of the slope, and as a result, slope disaster prevention. Maintaining strength and minimizing slope alterations.

<Installing the frame>
As an example, the frame 91 is made of T-shaped steel (100×100×6×8 mm) to reduce its weight. The mount 91 is used in an inverted T shape and is installed on the flanges of the pile heads of the toe pile 93A and the shoulder pile 93B in the road transverse direction, and if necessary, the road transverse direction, longitudinal direction and height For adjustment in the vertical direction, a known jig (not shown) is interposed, and bolts are used to connect the flanges of the pile heads to facilitate support and fixation. Then, the pedestals 91 are similarly installed at predetermined intervals Lp=2016 mm in the longitudinal direction of the road. See FIG. 5(c).
It should be noted that each of the above numerical values is an example, and is appropriately selected and used depending on the conditions.

<Erection of treads>
Between the inverted T-shaped pedestals 91 erected at a predetermined interval Lp = 2016 mm in the longitudinal direction of the road, treads 92 (as an example, a hollow box lid shape made of aluminum strip plate: length 2000 × width 500 × height 100 mm) are installed on the road. A passage width of 0.6 m or more is ensured by installing two in the transverse direction. Both ends of the treads 92 installed between the inverted T-shaped pedestals 91 are easily supported and fixed to the pedestals 91 by bolts in the longitudinal direction of the road. A cable rack 101 shown in FIG. 4 is incorporated in advance in the treads 92 arranged on the toe side of the road in the crossing direction. See FIGS. 4 and 5(d).
In addition, it is also possible to attach the fall prevention fence 8 to the trailing side end of the tread 92 in advance.

<Plumbing of pipelines to the pipeline space>
After installing the footboard 92 on the frame 91 , the pipeline 102 is laid on the cable rack 101 . See FIGS. 4 and 5(e).
It should be noted that the existing cable 7 should be completely relocated in advance.

<Installation of fall prevention fences>
A fall prevention fence 8 is installed at the toe side end of the escape/inspection passage 9 while securing a distance L = 1100 mm from the protection fence 5 so as not to hinder the function of the protection fence 5 . See FIG. 5(e).
In addition, as described above, it is also possible to attach it to the toe side footboard 92 in advance.

In the above-described fall prevention method for drivers and others outside the protective fence, the toe piles 93A and shoulder piles 93B in the road crossing direction of the embankment slope are driven at predetermined intervals in the road longitudinal direction, and the mount 91 are installed at predetermined intervals in the road longitudinal direction between the pile heads of the trailing pile 93A and the slope shoulder pile 93B in the road transverse direction, and the treads 92 having the pipeline space 100 below are installed at predetermined intervals. The evacuation and inspection passage 9 is formed by constructing between the mounting frames 91, and the fall protection fence 8 is secured at a distance from the protection fence 5 so as not to hinder the function of the protection fence 5. It is provided at the toe side end of the.

1 highway 11 embankment 12 embankment slope
2 Driving lane 3 Main track shoulder 4 Inspection passage 5 Protective fence (guard rail)
6 Protective road shoulder 7 Existing cable 8 Fall prevention fence 9 Evacuation combined inspection passage 91 Mount 92 Tread plate 93 Pile 93S Pile driving position 93A Trailing pile 93B Hill shoulder pile 100 Pipeline space 101 Cable rack 102 Pipeline 200 Pile driving machine

Claims (8)

In the event of an accident or breakdown on an embankment-structured expressway, the driver, etc. gets off the vehicle and temporarily evacuates outside the protective fence.
The evacuation and inspection passageway is composed of pedestals and treads, ensuring the necessary width as an inspection passageway. It is placed at the end of the trailhead side of the evacuation and inspection passage,
In the lower part of the evacuation and inspection passage, the trailing pile and the slope pile in the road crossing direction are arranged at predetermined intervals in the road longitudinal direction to support the evacuation and inspection passage,
A structure for preventing a driver or the like from falling outside the protective fence, characterized in that a pipeline space is provided below the evacuation and inspection passage. The frame is configured with a T-shaped metal fitting and used in an inverted T shape, and is arranged in the inverted T shape and supported and fixed between the pile heads of the toe pile and the shoulder pile in the road crossing direction,
A measure for preventing a driver from falling outside the protective fence according to claim 1, characterized in that said treads are supported and fixed between said inverted T-shaped pedestals arranged at predetermined intervals in the longitudinal direction of the road. structure. According to the inclination of the slope, the shoulder pile uses a pile shorter than the toe pile, and the toe pile and the shoulder pile are spiral piles. A fall prevention structure for a driver, etc., outside the protective fence according to any one of the above items. The pipeline space provided below the evacuation/inspection passage is configured with a three-sided enclosure cable rack and is incorporated in the footboard, and the cable rack is provided with pipes. A structure for preventing a driver or the like from falling outside the protective fence according to any one of claims 3 to 4. In the event of an accident or breakdown on an embankment-structured expressway, the driver, etc. gets off the vehicle and temporarily evacuates outside the protective fence.
The foot piles and shoulder piles of the embankment slope in the road cross direction are driven at predetermined intervals in the road longitudinal direction,
A trestle is erected at the predetermined intervals in the road longitudinal direction between the pile heads of the toe pile and the shoulder pile in the road transverse direction,
A footboard having a pipeline space below is installed between the pedestals installed at the predetermined intervals to form an evacuation and inspection passage,
A fall prevention fence is provided at the toe side end of the evacuation/inspection passage while securing a necessary width as an inspection passage while keeping a distance from the protection fence so as not to hinder the function of the protection fence. A fall prevention method for drivers, etc. outside the protective fence. The frame is constructed of a T-shaped metal fitting and used in an inverted T shape, and is supported and fixed in the inverted T shape between the pile heads of the toe pile and the shoulder pile in the road crossing direction,
A measure to prevent a driver from falling outside the protective fence according to claim 5, characterized in that the treads are supported and fixed between the inverted T-shaped pedestals arranged at predetermined intervals in the longitudinal direction of the road. Construction method. 7. Any one of claims 5 and 6, characterized in that the shoulder pile uses a pile shorter than the toe pile according to the inclination of the slope, and the toe pile and the shoulder pile are spiral piles. 1. A fall prevention method for drivers outside the protective fence according to 1. 5. The conduit space provided below the evacuation and inspection passageway is composed of a three-sided enclosure cable rack, which is incorporated in the footboard, and the cable rack is provided with pipes. Item 7. Fall prevention method for drivers outside the protective fence according to any one of Item 7.

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