Mobile protective fence trailer

Abstract

To safely and quickly secure a work area regardless of the situation of a road.SOLUTION: In a mobile protective fence trailer 1, when used for road work, a pair of beam members 15,15 are extended in the longitudinal direction of the mobile protective fence trailer 1, and the lower beam member is moved in the width direction of the mobile protective fence trailer 1 by using a moving means 19. Thus, the lower beam member is disposed below the upper beam member 15a. As a result, the pair of beam members 15,15 are arranged in a state of being laminated on one side in the width direction of the movable guard fence trailer 1, and a work area 2 surrounded by the first platform 11, the second platform 13, and the pair of beam members 15,15 is provided. As a result, since the work area 2 is surrounded by the first platform 11, the second platform 13, and the pair of beam members 15,15, the safety of the worker is ensured, and the worker can safely carry out work such as inspection and repair in the work area 2.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a mobile guardrail trailer for protecting personnel working on a road surface. [Background technology]

[0002] Generally, when workers inspect or repair the road surface, they place road cones or fences on the road surface to secure a work area (area where vehicles cannot enter). For example, Patent Document 1 discloses that a vehicle entry prevention fence is formed by placing blocks connected by a chain on the road surface to secure a work area for workers to work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6087017 Summary of the Invention [Problem to be solved by the invention]

[0004] When workers inspect or repair the road surface, it is desirable to quickly secure a work area where they can work safely. However, it may take time to secure a work area depending on the road conditions such as the gradient in the width direction of the road, slopes, curves, etc.

[0005] The present invention has been made in consideration of the above problems, and has an object to make it possible to safely and quickly secure a work area regardless of road conditions. [Means for solving the problem]

[0006] (Modes of the Invention) The following aspects of the invention are illustrative of the aspects of the present invention, and are described in terms to facilitate understanding of the various components of the present invention. Each of the following terms does not limit the technical scope of the present invention, and an aspect in which some of the components of each term are replaced or deleted, or other components are added, while taking into account the best mode for carrying out the present invention, can also be an aspect of the present invention.

[0007] (1) A mobile security fence trailer for ensuring the safety of workers performing work on a road, comprising: a first platform connected and supported by a tractor; a second platform having wheels; a pair of beam members extending in the front-rear direction between the first and second platforms, each of which is extendable in length and movable in the width direction of the mobile security fence trailer; a connection mechanism for connecting both ends of each beam member to the first and second platforms, respectively, so that the beam members can move independently in the width direction of the mobile security fence trailer and so that the second platform can be towed to the first platform; and a moving means for moving each of the beam members independently in the width direction of the mobile security fence trailer, wherein the connection mechanism comprises guide members extending in the width direction of the first and second platforms and capable of guiding each of the beam members in the width direction of the first and second platforms, and the guide members gradually decrease in diameter from one end to the other end or from the other end to one end (Claim 1).

[0008] In the mobile security fence trailer according to this section, the pair of beam members arranged between the first platform and the second platform and at different heights are contracted in the front-rear direction of the mobile security fence trailer (the longitudinal direction of the mobile security fence trailer) so that the overall length of the trailer is the shortest (i.e., the shortest within the range of extension and contraction of the pair of beam members) during travel. On the other hand, when used for road surface work, the pair of beam members are extended in the front-rear direction of the mobile security fence trailer, and one of the pair of beam members is moved in the width direction of the mobile security fence trailer using the moving means, that is, the pair of beam members are moved to one side in the width direction of the mobile security fence trailer. As a result, a work area is formed that is surrounded by the first platform, the second platform, and the pair of beam members. This allows workers to carry out work such as inspection and repair within the work area. In addition, the extension of the pair of beam members expands the area of ​​the work area, allowing work such as inspection and repair to be carried out over a wide area. Furthermore, when working on a two-lane road surface, or on the left and right lanes of a three-lane road surface, by positioning the opening side of the mobile protective fence trailer (i.e., the opposite side of the stacked pair of beam members) to the side opposite the shoulder strip or median strip, the work area is surrounded by the first platform, the second platform, the pair of beam members, and the shoulder strip or median strip side, thereby ensuring the safety of workers. The guide members of the connecting mechanism gradually reduce in diameter from one end to the other end or from the other end to the one end so that each beam member can be guided in the width direction of the first and second platforms.This reduces the resistance of each beam member when moving the pair of beam sections in the width direction of the mobile guard fence trailer, allowing the pair of beam sections to move smoothly.

[0009] (2) In the above paragraph (1), the pair of beam members are composed of an upper beam member and a lower beam member arranged at different heights between the first platform and the second platform, and the upper beam member is a mobile security fence trailer positioned above the lower beam member when the upper beam member or the lower beam member is moved in the width direction of the mobile security fence trailer by the moving means (Claim 2).

[0010] In the mobile guardrail trailer according to this section, since the pair of beam members is composed of an upper beam member and a lower beam member arranged at different heights, when the upper beam member or the lower beam member is moved in the width direction of the first platform and the second platform, the upper beam member is arranged above the lower beam member. As a result, the upper beam member or the lower beam member is arranged in a stacked state on one side of the width direction of the first platform and the second platform, and a work area surrounded by the first platform, the second platform, and the upper beam member or the lower beam member is formed. As a result, the height dimension of the upper beam member and the lower beam member from the road surface is sufficiently secured, and they function as a high-strength fence, so that even if a vehicle collides with the pair of beam members, it cannot climb over the pair of beam members, preventing entry into the work area, and workers can perform work such as inspection and repair in the work area.

[0011] (3) A mobile safety fence trailer according to the above paragraph (2), wherein the guide members of the connection mechanism are a pair of upper guide shafts that guide the upper beam and a pair of lower guide shafts that guide the lower beam members, which are arranged at different heights and extend in the width direction of the first platform and the second platform, and the pair of upper guide shafts are configured to taper in diameter from the right side to the left side in the width direction of the first platform and the second platform, and the pair of lower guide shafts are configured to taper in diameter from the left side to the right side in the width direction of the first platform and the second platform (Claim 3).

[0012] The mobile protective fence trailer of this section is provided with a pair of upper guide shafts that guide the upper beam and a pair of lower guide shafts that guide the lower beam members, which are arranged at different heights and extend in the width direction of the first and second platforms, thereby allowing the upper beam and lower beam to move smoothly in the width direction of the first and second platforms. In addition, since the pair of upper guide shafts are configured to narrow in diameter from right to left in the width direction of the first and second platforms, and the pair of lower guide shafts are configured to narrow in diameter from left to right in the width direction of the first and second platforms, it is possible to quickly secure a work area by moving either the upper beam or the lower beam in the narrowing direction of the pair of upper guide shafts and the pair of lower guide shafts depending on the road conditions such as the inspection of the expressway road surface, the condition of the repaired area, the gradient in the width direction of the road, slopes, curves, etc. Also, resistance to the movement of the upper beam or the lower beam is reduced. Effect of the Invention

[0013] By being configured as described above, the present invention makes it possible to safely and quickly secure a work area regardless of road conditions. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a side view of a mobile security fence trailer during travel (non-working) according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of the mobile security fence trailer shown in FIG. 1. [Diagram 3] FIG. 2 is a rear view of the mobile security fence trailer shown in FIG. 1. [Figure 4] 2 is a cross-sectional view taken along the line AA shown in FIG. 1. [Diagram 5] FIG. 2 is a cross-sectional view taken along line BB shown in FIG. [Figure 6]FIG. 2 is a side view of the mobile safety fence trailer shown in FIG. 1 during operation. [Figure 7] FIG. 7 is a top view of the mobile security fence trailer shown in FIG. 6. [Figure 8] FIG. 7 is a partially enlarged side view of the mobile security fence trailer shown in FIG. 6. [Figure 9] 13A and 13B are diagrams showing the operation of shifting a beam member to one side in the width direction of a mobile protective fence trailer, where (a) is a diagram before the beam member is shifted, and (b) is a diagram after the beam member has been shifted. [Figure 10] 10A and 10B are diagrams showing the returning operation of the beam member shown in FIG. 9, in which (a) is a diagram before the beam member is returned, and (b) is a diagram after the beam member is returned. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The configuration of a mobile safety fence trailer according to one embodiment of the present invention will be described in detail with reference to Figures 1 to 10. Here, the following description will be given of a case where work is carried out on an expressway.

[0016] As shown in Figures 1 to 3, the mobile protective fence trailer 1 is shown connected to a tractor 3, and comprises a first platform 11, a second platform 13, a pair of beam members 15, 15, a connection mechanism 17, a moving means 19 (see Figures 9 and 10), an impact absorbing mechanism 21, and an information display mechanism 23.

[0017] The front part of the first platform 11 is detachably connected to the tractor 3 via a coupler 5 (see Figs. 1 and 6). The rear part of the first platform 11 is connected to a pair of beam members 15, 15 via a connection mechanism 17 described below. Furthermore, a front auxiliary leg 7 that can be extended and contracted in the vertical direction is provided at the rear part of the first platform 11 (on the right side of the paper in Fig. 1) for supporting the first platform 11 and fixing the mobile guardrail trailer 1 onto the road surface G during work such as inspection and repair of the road surface G.

[0018] The front part of the second platform 13 is connected to a pair of beam members 15, 15 via a connection mechanism 17 described later. In addition, an outrigger 9 (see Figs. 1 and 6) is provided on the lower part of the second platform 13 for fixing the mobile safety fence trailer 1 onto the road surface G during work such as inspection and repair of the road surface G. The outrigger 9 comes into contact with the road surface G during work by adjusting the vehicle height of an air suspension (not shown) of the second platform 13. An impact buffer mechanism 21 and a displacement mechanism 25 that enables the mounting position of the license plate 4 to be displaced are provided on the rear part of the second platform 13. In addition, an information display mechanism 23 is provided on the upper surface of the second platform 13.

[0019] As shown in Figs. 1, 2, 6 and 7, the pair of beam members 15, 15 are made of two hollow members with rectangular cross sections, each of which is extendable and retractable, and are arranged at different heights between the first platform 11 and the second platform 13, and can be moved in the width direction of the mobile safety fence trailer 1 by a moving means 19 described later so as not to interfere with each other. The pair of beam members 15, 15 are locked and unlocked by a locking mechanism (not shown) for locking them at a predetermined position in the width direction of the mobile safety fence trailer 1. The pair of beam members 15, 15 (upper beam member 15a and lower beam member 15b) each have an inner cylinder portion 31, an outer cylinder portion 33, and a plurality of pins 35. The upper beam member 15a has a plate member 39a extending vertically along its outer surface in the longitudinal direction. The lower beam member 15b has a plate member 39b extending upward along its outer surface in the longitudinal direction. Moreover, the lower beam member 15b is provided at its upper portion with a hook 61 for hooking the lock hook 57 or the string-like member 55 of the chain block 51 of the moving means 19 (see Figs. 9 and 10). One end of the inner cylinder 31 is connected to the connection mechanism 17, and the other end is slidably inserted into the outer cylinder 33. The inner cylinder 31 is provided with a plurality of pin holes 37, 37 for inserting the pin 35 near both ends (see Figs. 2 and 7). The outer cylinder 33 has an inner dimension set larger than the outer dimension of the inner cylinder 31, and is provided with a pin hole 37 (see Figs. 2, 6, 7, and 8) for inserting the pin 35 near one end (i.e., the opposite end to the end connected to the connection mechanism 17). The other end of the outer cylinder 33 is connected to the connection mechanism 17. The pin 35 is for locking the extension and contraction of the pair of beam members 15, 15, i.e., the sliding of the inner cylinder 31 relative to the outer cylinder 33.

[0020] 4, 5 and 8, the connection mechanism 17 is for connecting both ends of a pair of beam members 15, 15 (one end of the inner cylinder portion 31 and the other end of the outer cylinder portion 33) to the first platform 11 and the second platform 13 so as to be independently movable in the width direction of the mobile protective fence trailer 1 and to be able to tow the second platform 13 to the first platform 11. The connection mechanism 17 is provided at the rear of the first platform 11 and the front of the second platform 13, and includes a pair of guide members 41a, 41b and an extension member 43.

[0021] As shown in Figs. 4, 5 and 8, the pair of guide members 41a, 41b are cylindrical shafts consisting of upper and lower stages, which are provided at the rear of the first platform 11 and the front of the second platform 13, respectively, and guide the upper stage beam member 15a and the lower stage beam member 15b in the width direction of the first platform 11 and the second platform 13. The upper stage guide shafts 45a, 45a correspond to the upper stage beam member 15a, and the lower stage guide shafts 45b, 45b correspond to the lower stage beam member 15b. The upper stage guide shafts 45a, 45a on the first platform 11 side and the second platform 13 side are configured so that the diameter gradually decreases from one end to the other end, i.e., from the right side in the width direction of the first platform 11 and the second platform 13 (upper side in Fig. 2) to the left side in the width direction (lower side in Fig. 2). Specifically, the diameter D R1 Diameter D from 140mm to the other end L1 The lower guide shafts 45b, 45b on the first platform 11 side and the second platform 13 side are configured so that the diameter gradually decreases from the other end to the one end, i.e., from the first platform 11 and the second platform 13 toward the right side in the width direction (upper side of the paper in FIG. 2). Specifically, the diameter D L2 Diameter D from 140mm to the other end R2 It is configured to taper gradually to 130 mm.

[0022] 4, 5 and 8, the extension member 43 includes at least a pair of plate-like members 47, 47 attached to both ends of the upper beam member 15a and the lower beam member 15b and arranged to sandwich the upper guide shaft 45a and the lower guide shaft 45b, respectively, and a support portion 49 that supports the plate-like members 47, 47. The pair of plate-like members 47, 47 extend from the support portion 49 toward the first platform 11 and the second platform 13 so as to be movable in the width direction of the first platform 11 and the second platform 13. The support portion 49 is attached to both ends of the upper beam member 15a and the lower beam member 15b.

[0023] As shown in Figs. 9 and 10, the moving means 19 moves the lower beam member 15b in the width direction of the mobile safety fence trailer 1, and is provided on each of the first platform 11 and the second platform 13. The moving means 19 is composed of a chain block 51, a pulley 53, and a string-like member 55. The chain block 51 is stored in the mobile safety fence trailer 1 during travel, and when moving the beam member 15 (the lower beam member 15b in this embodiment), the lock hook 57 of the chain block 51 is hooked onto a hook portion 59 provided on the first platform 11 and the second platform 13. The pulley 53 is attached to the first platform 11 and the second platform 13 so as to face the hook portion 59. The string-like member 55 is a cord-like member such as a wire, rope, chain, etc., and is stored inside the mobile protective fence trailer 1 when traveling.When moving a pair of beam members 15, 15, it is used by connecting one end to the lock hook 57 of the chain block 51 while hanging it around the pulley 53, and hooking the other end onto the hanging hook 61 of the lower beam member 15b.

[0024] The shock absorbing mechanism 21, as shown in Figures 1 and 6, is attached to the rear of the second platform 13, and is stored on the second platform 13 in a folded state during travel (see Figures 1 and 2), and is deployed so as to extend from the rear of the second platform 13 during work (see Figures 6 and 7). This shock absorbing mechanism 21 can be any type of shock absorbing mechanism capable of absorbing shock caused by a vehicle collision during work such as road surface repair and road surface inspection.

[0025] 1 and 6, the information display mechanism 23 includes an information display unit 63, and is erected on the upper surface of the second platform 13 so that the information display unit 63 faces rearward in the traveling direction of the tractor 3. The information display mechanism 23 is operated by power supplied from the tractor 3. In addition, the information display mechanism 23 is provided with a warning light 65.

[0026] Next, a method of using the mobile safety fence trailer 1 will be described with reference to FIGS. First, the mobile safety fence trailer 1 is driven to a work site surrounded by road cones that have been set up in advance. During driving, as shown in Figs. 1 to 3, a pair of beam members 15, 15 (upper beam member 15a and lower beam member 15b) provided between the first platform 11 and the second platform 13 are contracted in the front-rear direction of the mobile safety fence trailer 1 (longitudinal direction of the mobile safety fence trailer 1) so that the overall length of the mobile safety fence trailer 1 is minimized (i.e., the shortest within the range of extension and contraction of the pair of beam members 15, 15). In addition, the shock absorbing mechanism 21 is stored in a folded state on the second platform 13, and the front auxiliary legs 7 and the outriggers 9 are in a stored state (see Fig. 1).

[0027] Then, after arriving at the work site and stopping the tractor 3, the shock absorbing mechanism 21 is deployed and positioned so as to extend from the rear of the second platform 13. At this time, the license plate 4 is hidden by the shock absorbing mechanism 21, so the license plate 4 is positioned upward by the displacement mechanism 25.

[0028] Then, the pins 35, 35 inserted through the pin holes 37 on one end side of the inner cylinder portion 31 of the pair of beam members 15, 15 and the pin hole 37 on the outer cylinder portion 33 are removed. Then, the tractor 3 is moved forward a predetermined distance to slide the inner cylinder portion 31 along the inside of the outer cylinder portion 33, and the pair of beam members 15, 15 are extended. After being extended to a predetermined position, the pins 35, 35 are inserted into the pin holes 37 on the other end side of the inner cylinder portion 31 and the pin hole 37 on the outer cylinder portion 33, and the inner cylinder portion 31 is locked to the outer cylinder portion 33 (see Figures 6 and 7). As a result, the inner cylinder portion 31 does not slide along the inside of the outer cylinder portion 33, and the extension of the pair of beam members 15, 15 is maintained.

[0029] Then, the front auxiliary legs 21 are extended and brought into contact with the road surface G (see Figure 6), and the outriggers 27 are brought into contact with the road surface G by adjusting the height of the air suspension of the second platform 13, thereby fixing the mobile protective fence trailer 1 to the road surface G.

[0030] Then, the lower beam member 15b is moved in the width direction of the mobile safety fence trailer 1 by the moving means 19. Specifically, as shown in FIG. 9, one end of the lock hook 57 of the chain block 51 is hooked to a hooking portion 59 provided on the first platform 11. Then, the string-like member 55 is hung on the pulley 53, one end of the string-like member 55 is connected to the other end of the lock hook 57 of the chain block 51, and the other end of the string-like member 55 is hooked to the hook 61 of the lower beam member 15b. Then, the worker operates the chain block 51 to pull the string-like member 55 connected to the other end of the lock hook 57 toward the chain block 51. As a result, the lower beam member 15b moves toward the upper beam member 15a. At this time, the lower guide shafts 45b, 45b on the first platform 11 side and the second platform 13 side have a diameter D L2 ,D R2 When viewed from the rear to the front of the vehicle, the first platform 11 and the second platform 13 have a diameter D L2 ,D R2is gradually reduced in diameter (in this embodiment, the diameter D L2 Diameter D from 140mm R2 130 mm). Therefore, regardless of road conditions such as the gradient in the width direction of the road, slopes, and curves, the resistance when the lower beam member 15b moves from the left side in the width direction to the right side in the width direction is reduced by the increase in the dimensional difference with the pair of plate-like members 47, 47 that accompanies the movement (i.e., the increase in the gap between the lower guide shafts 45b, 45b and the pair of plate-like members 47, 47), so that the lower beam member 15b can be moved smoothly. The moving means 19 is provided in the vicinity of the first platform 11 and the second platform 13, respectively, and the above work is performed by two operators who work in sync with each other. Moreover, no power source is required for the above work, and the work is performed only by human power. Then, by moving the lower beam member 15b to a predetermined position, the upper beam member 15a and the lower beam member 15b are arranged in a stacked state (see FIG. 9(b)), and the working area 2 (see FIG. 7) is formed surrounded by the first platform 11, the second platform 13, and the pair of beam members 15, 15. Also, a gap is formed between the pair of beam members 15, 15, but this gap is covered by plate members 39a, 39b provided on the pair of beam members 15, 15. As described above, the moving means 19 is also provided on the second platform 13 side, but as it has the same configuration as the moving means 19 provided on the first platform 11, a detailed description thereof will be omitted.

[0031] Then, with the upper beam member 15a and the lower beam member 15b stacked, the lower beam member 15b is locked by a locking mechanism (not shown). This forms a work area 2 where workers can work safely, and they can safely carry out work such as inspection and repair of the road surface G within the work area 2. The deployment work of the shock absorbing mechanism 21 may be carried out after the pair of beam members 15, 15 are extended, or the order of work may be changed as appropriate.

[0032] Next, when returning the mobile safety fence trailer 1 from the working mode to the traveling mode, the lower beam member 15b is unlocked and moved in the width direction of the mobile safety fence trailer 1. Specifically, referring to FIG. 10, one side of the lock hook 57 of the chain block 51 is hooked to the hook 59 provided on the first platform 11, while the other side of the lock hook 57 is hooked to the hook 61 of the lower beam member 15b. Then, the chain block 51 is operated to pull the lower beam member 15b toward the chain block 51 (see FIG. 10(a)). Then, after the lower beam member 15b is moved to a predetermined position (see FIG. 10(b)), the lower beam member 9b is locked.

[0033] Then, the front auxiliary legs 7 are stored on the first platform 11, and the outriggers 9 are stored by adjusting the vehicle height of the air suspension of the second platform 13, and the mobile safety fence trailer 1 is released from its fixation to the road surface G.

[0034] Then, the pins 35, 35 inserted into the pin holes 37 on the other end side of the inner cylinder portion 31 and the pin holes 37 of the outer cylinder portion 33 are removed, and then the tractor 3 is moved backward a predetermined distance and the inner cylinder portion 31 is slid into the outer cylinder portion 33. Then, after the inner cylinder portion 31 has been slid the predetermined distance, the pins 35, 35 are inserted into the pin holes 37 on one end side of the inner cylinder portion 31 and the pin holes 37 of the outer cylinder portion 33, thereby fixing the inner cylinder portion 31 to the outer cylinder portion 33.

[0035] Then, the deployed shock absorbing mechanism 21 is folded and stored on the second platform 13, and the license plate 4 is positioned downward by the displacement mechanism 25. This minimizes the overall length of the mobile safety fence trailer 1, making it possible for the tractor 3 to travel and suitable for moving to another work site. The shock absorbing mechanism 21 may be deployed before the pair of beam members 15, 15 are contracted, and the order of operations may be changed as appropriate.

[0036] As described above, the mobile safety fence trailer 1 according to one embodiment provides the following advantageous effects. During travel, the pair of beam members 15, 15, which are provided between the first platform 11 and the second platform 13 and are arranged at different heights, are operated so as to be shortened in the front-rear direction of the mobile safety fence trailer 1 (the longitudinal direction of the mobile safety fence trailer 1) so that the overall length of the mobile safety fence trailer 1 is minimized. On the other hand, when used for road surface G work, the pair of beam members 15, 15 are extended in the front-rear direction of the mobile safety fence trailer 1, and one of the pair of beam members 15, 15 is moved in the width direction of the mobile safety fence trailer 1 using the moving means 19, that is, the pair of beam members 15, 15 are moved to one side in the width direction of the mobile safety fence trailer 1. At this time, since the pair of beam members 15, 15 are arranged at different heights, when the lower beam member 15b is moved in the width direction of the mobile safety fence trailer 1, the lower beam member 15b is arranged below the upper beam member 15a. As a result, the pair of beam members 15, 15 are arranged in a stacked state on one side in the width direction of the mobile protective fence trailer 1, and a work area 2 is provided that is surrounded by the first platform 11, the second platform 13, and the pair of beam members 15, 15. This enables workers to perform work such as inspection and repair within the work area 2. In addition, by extending the pair of beam members 15, 15, the area of ​​the work area 2 is expanded, making it possible to perform work such as inspection and repair over a wide area.

[0037] In addition, with the mobile guardrail trailer 1 of one embodiment, when working on the road surface G of a two-lane road, or on the road surface G of the left and right lanes of a three-lane road, the opening side of the mobile guardrail trailer 1 (i.e., the opposite side of the pair of stacked beam members 15, 15) is positioned facing the sidewalk side or the median strip side, so that the work area 2 is surrounded by the first platform 11, the second platform 13, the pair of beam members 15, 15, and the sidewalk side or the median strip side, thereby ensuring the safety of workers.

[0038] Furthermore, according to one embodiment of the mobile protective fence trailer 1, a pair of beam members 15, 15 are stacked in structure, so that the height dimension of the pair of beam members 15, 15 from the road surface G is sufficiently secured and they function as a high-strength fence, so that even if a vehicle collides with the pair of beam members 15, 15, the vehicle will not be able to climb over the pair of beam members 15, 15, and entry into the work area 2 can be prevented.

[0039] According to the mobile safety fence trailer 1 according to one embodiment, when the pair of beam members 15, 15 are moved to one side in the width direction of the mobile safety fence trailer 1, the pair of beam members 15, 15 are locked in that position in the state of being moved to one side in the width direction of the mobile safety fence trailer 1, so that the positions do not change even if the upper and lower beam members 15a, 15b are subjected to an external force. Furthermore, even if the mobile safety fence trailer 1 is stopped on a sloped road surface, it is possible to prevent the pair of beam members 15, 15 from moving in the width direction of the mobile safety fence trailer 1. In addition, by locking the pair of beam members 15, 15 to the ends opposite each other in the width direction during travel, stability during travel can be ensured. The pair of beam members 15, 15 function as strength members that ensure the necessary strength as a vehicle when the mobile safety fence trailer 1 is traveling, and function as a fence that ensures the safety of workers in the work area 2 during work.

[0040] According to the mobile safety fence trailer 1 according to one embodiment, the upper guide shafts 45a, 45a have a diameter D L1 ,D R1 The lower guide shafts 45b, 45b are configured so that the diameter D L2 ,D R2As a result, the resistance when the upper beam member 15a or the lower beam member 15b moves is reduced by the increase in the dimensional difference between the pair of plate-like members 47, 47 and the upper guide shafts 45a, 45a and the lower guide shafts 45b, 45b that accompanies the movement, so that the movement can be made smooth regardless of the road conditions such as the inspection of the road surface G of the expressway, the condition of the repaired area, the gradient in the width direction of the road, slopes, curves, etc., and the working area 2 can be quickly secured.

[0041] In one embodiment of the mobile protective fence trailer 1, it has a plate material 39a that extends upward and downward along the longitudinal outer surface of the upper beam member 15a, and a plate material 39b that extends upward along the longitudinal outer surface of the lower beam member 15b, so that the total height dimensions of each beam member 15, 15 and the plate materials 39a, 39b are the same or approximately the same when viewed from both sides, ensuring an external balance and allowing the strength of the pair of beam members 15, 15 to be complemented by the plate materials 39a, 39b.

[0042] According to one embodiment of the mobile protective fence trailer 1, when a pair of beam members 15, 15 are shifted to one side in the width direction of the mobile protective fence trailer 1, i.e., when the pair of beam members 15, 15 are stacked, the gap between the pair of beam members 15, 15 is covered by plate materials 39a, 39b, thereby preventing foreign objects from entering or jumping out of the gap.

[0043] According to the mobile safety fence trailer 1 according to one embodiment, when a traveling vehicle collides with the rear of the mobile safety fence trailer 1, the shock absorbing mechanism 21 provided at the rear of the second platform 13 absorbs the impact of the collision between the vehicle and the mobile safety fence trailer 1. This prevents the second platform 13 from being pushed forward (towards the first platform 11) of the mobile safety fence trailer 1 due to the collision, ensuring the safety of workers working in the work area 2.

[0044] According to the mobile guardrail trailer 1 of one embodiment, the information display mechanism 17 provided on the second platform 13 can display any information such as that the road is being inspected or repaired, thereby alerting the drivers of vehicles traveling on the road. Furthermore, by appropriately displacing the position of the license plate 4 of the tractor 3 using the displacement mechanism 25, the license plate 29 can be positioned in an easy-to-see position even when the shock absorbing mechanism 21 is located at the rear of the second platform 13 during work such as inspection or repair of the road surface G.

[0045] In one embodiment of the mobile protective fence trailer 1, the inspection, repair, and other work on the road surface G of a highway has been described, but it may also be applied to inspection, repair, and other work on general roads (for example, the surface of a two-lane road, or the surface of the left and right lanes of a three-lane road, etc.).

[0046] In addition, in one embodiment of the mobile protective fence trailer 1, the upper beam member 15a and the lower beam member 15b have a rectangular cross-section, but may have other shapes such as a cylindrical shape, a polygonal shape such as a hexagon or octagon, a U-shape in cross-section, or an I-shape in cross-section.

[0047] Furthermore, in the mobile safety fence trailer 1 according to one embodiment, the lower beam member 15b is moved in the width direction of the mobile safety fence trailer 1 by the moving means 19, but the upper beam member 15a may be moved in the width direction of the mobile safety fence trailer 1 depending on the work site. Also, the moving means 19 uses a chain block to move the upper beam member 15a or the lower beam member 15b in the width direction of the first platform 11 and the second platform 13, but other moving means such as a hydraulic cylinder, an air cylinder, or a hydraulic winch may be used.

[0048] In one embodiment of the mobile guardrail trailer 1, the pair of beam members 15, 15 are extended or retracted by the forward or backward movement of the tractor 3, but it is also possible to provide the mobile guardrail trailer 1 with an auxiliary power source such as hydraulics so that the pair of beam members 15, 15 can be extended or retracted by the auxiliary power source.

[0049] In the mobile security fence trailer 1 according to one embodiment, when the pair of beam members 15, 15 are stacked, a balance weight may be provided on the opposite side to the side where the pair of beam members 15, 15 are shifted to one side in the width direction of the mobile security fence trailer 1. This allows the balance of the mobile security fence trailer 1 to be maintained.

[0050] In the mobile safety fence trailer 1 according to one embodiment, the upper beam member 15a has a plate member 39a extending vertically along the outer surface in the longitudinal direction, and the lower beam member 15b has a plate member 39b extending upward along the outer surface in the longitudinal direction, but a blind member such as a panel or sheet extending upward along the outer surfaces in the longitudinal direction of the pair of beam members 15, 15 may be provided. This makes it possible to cover the work area 2 and prevent foreign objects from entering or jumping out. Furthermore, it is possible to prevent lines of sight from inside vehicles passing through the work site, thereby preventing so-called spectator congestion.

[0051] In the mobile safety fence trailer 1 according to one embodiment, in order to prevent the pair of beam members 15, 15 from moving in the width direction of the first and second platforms 11, 13, when the upper and lower beam members 15a, 15b are stacked (during operation), diagonal members may be provided that connect positions near the ends of the upper and lower beam members 15a, 15b and positions spaced apart in the width direction from the ends of the upper and lower beam members 15a, 15b of the first and second platforms 11, 13. Note that the diagonal members are stored in the mobile safety fence trailer 1 when traveling. [Explanation of symbols]

[0052] Reference Signs List 1...mobile safety fence trailer, 11...first platform, 13...second platform, 15...pair of beam members, 17...connection mechanism, 19...movement means, 41...guide member

Claims

1. A mobile protective fence trailer for ensuring the safety of workers working on the road, a first platform connected to and supported by the tractor; a second platform having wheels; a pair of beam members extending in a front-rear direction between the first platform and the second platform, each of which is extendable and contractible in length and movable in a width direction of the mobile security fence trailer; a connection mechanism for connecting both ends of each beam member to the first platform and the second platform so as to be independently movable in the width direction of the mobile security fence trailer and to connect the second platform to the first platform so as to be towable; and a moving means for moving each of the beam members independently in the width direction of the movable safety fence trailer, The connection mechanism includes guide members extending in the width direction of the first platform and the second platform, capable of guiding each beam member in the width direction of the first platform and the second platform, and the guide members gradually reduce in diameter from one end to the other end or from the other end to one end.

2. The pair of beam members is composed of an upper beam member and a lower beam member that are disposed at different heights between the first platform and the second platform, A mobile security fence trailer as described in claim 1, characterized in that the upper beam member is positioned above the lower beam member when the upper beam member or the lower beam member is moved in the width direction of the mobile security fence trailer by the moving means.

3. The guide members of the connection mechanism are arranged at different heights from each other, extend in a width direction of the first platform and the second platform, and include a pair of upper guide shafts for guiding the upper beam and a pair of lower guide shafts for guiding the lower beam; 3. The mobile security fence trailer as described in claim 2, characterized in that the pair of upper guide shafts are configured to have a diameter that tapers from the right side to the left side in the width direction of the first platform and the second platform, and the pair of lower guide shafts are configured to have a diameter that tapers from the left side to the right side in the width direction of the first platform and the second platform.

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