JP5887209B2 - Mobile safety belt mounting device for bridge construction - Google Patents

Description

  The present invention relates to a mobile safety band mounting device for bridge construction (hereinafter referred to as a “mobile safety belt mounting device”) that prevents falling of workers who work on bridge girders and increases the efficiency of work at high places in bridge construction such as road bridges. )).

  Many bridge works, such as road bridges, are carried out on high places on bridge girders, so workers are working with the safety lines (belts with a lifeline) worn by themselves on the support installed on the bridge. We are trying to prevent a fall accident.

  However, when installing support on the bridge and when removing it, there is almost no support for securing the lifeline of the safety belt, and safety measures at that time were an issue. .

  Conventionally, when working on a bridge girder made of H-shaped steel, I-shaped steel, etc., a master rope column is erected on the bridge girder with an interval of about 5 m, and a rope or steel pipe made between the columns. It was used as a support (hereinafter referred to as “safety belt mounting device”) with a handrail.

  For example, when the height of a bridge girder is about 2 m, a pillar is often attached on the ground using a ladder before the bridge girder is installed with a crane. In this case, the ladder needs to be stood at every installation interval of the support, and the worker has to go up and down the ladder every time.

  Also, when removing, it is often done using a middle stage scaffolding installed at a position about 1.5m below the upper flange of the bridge girder. In this case, the middle stage scaffolding must be temporarily installed. Problems remain in the problem.

  In addition, as a conventional technique, Patent Document 1 discloses a pair of rotational movements mounted on the upper flange of the beam and rotating on the upper flange as a crash prevention device for use in work performed on the beam in the steel building. A crash prevention device is described which comprises means, connecting means for connecting the rotational movement means, and safety band attaching means.

  In addition, the applicant has developed a safety belt mounting device that is configured not only to prevent the safety accident of the worker by dropping the safety belt but also to move together with the worker on the bridge girder (Patent Document). 2).

  This safety belt mounting device grips the upper flange of the bridge girder from both sides from the connecting part that connects the pair of left and right struts to the bridge girder and the strut part and the stopper part protruding from the lower end of the strut part. It is configured.

  And, the worker can prevent the worker's own fall accident by tying the lifeline of the safety belt he / she wears to the handrail part etc. spanned between the support part and the upper end part of the support part, It can be pushed or swung by a pair of left and right wheel parts attached to the connecting part and can freely move with the worker in the bridge axis direction on the bridge girder.

Japanese Patent No. 2712013 JP 2009-240357 A JP 2011-206245 A

  However, as described above, the method of attaching the master rope support to the upper flange of the bridge girder has problems of safety, workability, and economy at the time of attachment and removal.

  Moreover, the thing of patent document 1 made the work on the beam in a steel frame building object, and although it is structurally simple, it cannot be utilized for bridge construction as it is.

  Particularly in the case of bridge construction, the bridge girder itself is large, and the connecting portion between the bridge girders has a step of the connecting plate for high-strength bolt joining, and a structure that can overcome the step is required.

  In addition, a stud gibber for connecting with a floor slab installed on the main girder is provided, and a seal material is installed at the end of the main girder upper flange. A structure that can avoid these is required.

  Furthermore, since what is described in Patent Document 3 cannot change the distance between the pair of support columns and the stoppers disposed on the left and right sides of the bridge girder, it is difficult to handle a bridge girder with a different width. there were.

  The present invention was made in order to solve the above problems, and when performing work on a bridge girder in bridge construction, the safety of workers during installation and removal is ensured, and the workability and economy are improved. An object of the present invention is to provide an excellent mobile safety belt attachment device.

  The present invention is a mobile safety band attachment device for bridge construction for securing a safety band of a worker who performs work on a bridge girder, and includes a plurality of wheels that run in the bridge axis direction on the bridge girder. Provided at the lower end of the guide member, two swivel booms arranged in a cross shape that swivel in a plane on the vehicle body, a guide member extending from both ends of the swivel boom to a lateral lower portion of the upper flange of the bridge girder And a plurality of fall prevention stoppers that follow the turning of the turning boom and turn in the bridge girder width direction and enter the lower side of the upper flange of the bridge girder. .

  In the present invention, when installing / disassembling a safety belt mounting device on a bridge girder, it can be freely moved on the bridge girder by pushing or checking along with the movement of an operator, and a plurality of bridge girders having different widths can be obtained. Can also be installed and used.

  In other words, by installing a wheel for movement on the vehicle body, an operator walking on the bridge girder can push or pull and move freely on the bridge girder together with the worker, especially when installing the safety belt attachment device and The work on the bridge girder at the time of removal can be performed very efficiently.

  Further, the two swivel booms are arranged in a cross shape and can be swung on both sides of the bridge girder around the same axis, and are further drawn in the width direction of the bridge girder, and the guide member is connected to the edge of the upper flange of the bridge girder. By providing a spring member that comes into contact with the end face, the fall prevention stopper attached to the lower end of the guide member can freely turn in the bridge girder width direction following the turning movement of the turning boom. If possible, it can be installed on bridge girders with different widths, and can be used for multiple bridge girders with different widths.

  Moreover, the installation to a bridge girder can be easily installed on the bridge girder even from the middle of the bridge girder by expanding the fall prevention stopper in the width direction of the bridge girder.

  In addition, the fall-prevention stopper attached to the lower end of the guide member is pushed into the lower side of both sides of the upper flange of the bridge girder by the spring member via the swing boom, so that the upper flange of the bridge girder is closely attached from both sides By holding the swivel boom with a swivel limiter, the fall prevention stopper does not come off from the lower side of the lower flange of the bridge girder during work, and the safety is extremely high.

  In addition, since the guide roller that runs on the edge surface of the upper flange of the bridge girder is provided, the running is also stable and smooth. In addition, the wheel has a size that allows the dowels projecting from the upper flange of the bridge girder to be displaced, and between the connecting plate that connects the bridge girders between the stopper and the upper flange of the bridge girder, and the upper flange of the bridge girder. By having a clearance of an amount that can eliminate the step that is formed, it is possible to pass through the stud gibber and the stepped portion without difficulty.

  According to the present invention, by providing a plurality of wheels that can travel in the direction of the bridge axis, particularly when installing / disassembling the safety belt mounting device on the bridge girder, it is pushed or pushed along with the movement of the worker. In addition to being able to move freely on the bridge girder, work efficiency can be improved, and it can be installed and used in a plurality of bridge girders with different widths.

  Moreover, the installation to a bridge girder can also be easily installed on the bridge girder even from the middle of the bridge girder by expanding the fall prevention stoppers positioned on both sides of the bridge girder in the bridge girder width direction.

  In addition, the fall prevention stopper is pushed by the spring member below the both sides of the upper flange of the bridge girder through the swing boom, so that the upper flange of the bridge girder is gripped from both sides and then falls. Since the prevention stopper is fixed at a predetermined position by the turning limiter via the turning boom, the fall prevention stopper does not come off from the lower side of the lower flange of the bridge girder during work, and the safety is extremely high. Moreover, the movement is smooth by providing a plurality of guide rollers that run on the edge surface of the upper flange of the bridge girder.

  Therefore, it is possible to prevent workers from falling accidents during installation and dismantling of safety band attachment devices used for work on bridge girders in bridge construction. Problems unique to bridge construction, such as the gibber provided at the end and the seal material at the end of the girder flange, can be easily avoided.

It is a top view which shows one Embodiment of the mobile safety band attachment apparatus for bridges of this invention. FIG. 2 is a front view of the mobile safety belt attaching device illustrated in FIG. 1. FIG. 2 is a side view of the mobile safety belt attaching device illustrated in FIG. 1. FIG. 2 is a side view of the mobile safety belt attaching device illustrated in FIG. 1.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to these embodiments.

  1 to 4 show an embodiment of a mobile safety band attaching device of the present invention. In the figure, a handrail 2 and two swivel booms 3 and 3 and a swivel boom are shown on a vehicle body 1. A swing limiter 4 is provided for limiting the swing movement of the swing booms 3 and 3 within a certain range and fixing and releasing the swing movement of the swing booms 3 and 3. A plurality of wheels 5 that run on the bridge girder A in the direction of the bridge axis are provided below the vehicle body 1.

  The vehicle body 1 is formed in a rectangular plate shape that is long in the bridge axis direction, and two wheels 5 are attached in parallel via brackets 6 on the front end side and the rear end side of the vehicle body 1.

  The bracket 6 is attached to the vehicle body 1 so as to slide freely in the bridge girder width direction. Thus, by appropriately adjusting the distance between the wheels 5 and 5 on the front end side and the rear end side, the vehicle body 1 avoids the bolts and studs C protruding from the upper flange B of the bridge girder A, and the bridge shaft. It can move smoothly in the direction.

  Each wheel 5, 5 has a built-in brake function so that it can be stopped on the bridge girder A. As a structure of the brake in this case, for example, a system in which the brake 7 is strongly pressed against the traveling surface of the wheel 5 to fix the wheel 5 so as not to rotate can be applied.

  The brake 7 has an external thread portion, and is attached so as to penetrate the vehicle body 1 from the upper side of the vehicle body 1 and come into contact with the running surface of each wheel 5. Then, the male screw portion (not shown) of the brake 7 is fastened to a screw hole (not shown) formed in the vehicle body 1 and the wheel 5 is prevented from rotating by strongly pressing the tip of the brake 7 against the running surface of each wheel 5. Can be fixed to.

  Reference numeral 7 a denotes a handle for tightening the brake 7, and the handle 7 a is attached to the upper end of the brake 7.

  Each bracket 6, 6 incorporates a spring or hydraulic shock absorber (not shown) so that a step on the upper surface of the bridge girder A due to a joining plate or the like can be easily absorbed.

  As a structure for sliding each bracket 6 in the bridge girder width direction, for example, a long hole (not shown) is formed in the vehicle body 1 in the bridge girder width direction, and the bracket 6 slides in the long hole at the upper end portion. A male screw portion (not shown) is formed. And the structure etc. which fasten and fix the said external thread part to a fixed hole with a fixing nut can be applied.

  The handrail 2 includes a plurality of support columns 2a, 2a and a handle 2b that extends horizontally between the upper ends of the support columns 2a, 2a, and is erected at the rear end portion of the vehicle body 1.

  The turning boom 3 is disposed on the vehicle body 1 along the width direction of the bridge beam A. Each turning boom 3 is crossed in a plane X shape at an intermediate portion, and the crossed portion is pivotally supported by the same shaft 8 at the center of the vehicle body 1.

  As a result, each swivel boom 3 swivels in the plane about the same axis 8, and both ends thereof swivel and move in a substantially arcuate shape on both sides of the bridge girder A as viewed in a plane in the bridge axis direction. ing.

  Each turning boom 3 is composed of an outer tube 3a and a plurality of inner tubes 3b, 3b respectively inserted at both ends thereof, and the inner tubes 3b, 3b at both ends extend in the tube axis direction in the outer tube 3a. It can be freely expanded and contracted by sliding. Each inner pipe 3b can slide and extend forward from the edge of the upper flange B of the bridge beam A.

  Furthermore, a coupling hole (not shown) is formed in each of the outer tube 3a and the inner tube 3b. Particularly, the coupling hole of the outer tube 3a is formed at both ends of the outer tube 3a, and the coupling hole of the inner tube 3b is in the tube axis direction. A plurality are formed at regular intervals.

  Then, by inserting coupling pins 9 made of bolts or the like into both coupling holes, the inner tubes 3b and 3b are fixed to both ends of the outer tube 3a, respectively, and there are a plurality of inner tubes 3b. By inserting the connecting pin 9 into one connecting hole selected from the connecting holes, each turning boom 3 can be set to an optimum length according to the width of the upper flange B of the bridge beam A.

  In addition, guide members 10 are suspended from both ends of each of the turning booms 3, 3, that is, at the tip of each inner tube 3b. Each guide member 10 extends to the lower side of the upper flange B of the bridge girder A, and a guide roller 11 is attached at a position where it abuts on the edge surface of the upper flange B at the lower end of each guide member 10.

  Furthermore, a fall prevention stopper 12 is attached to the lower end portion of each guide member 10 so as to be positioned below the guide roller 11, whereby the plurality of guide rollers 11, 11 and the fall prevention stoppers 12, 12 are respectively It is arranged symmetrically on both the left and right sides of the bridge girder A.

  The guide roller 11 is a guide that rotates the edge surface of the upper flange B of the bridge girder A in the bridge axis direction in accordance with the movement in the bridge axis direction, and is covered with a tube made of vinyl resin or the like. Care is taken not to damage the edge surface of the flange B.

  In this case, the guide roller 11 may be one in which a tube made of vinyl resin or the like is rotatably attached to a contact portion with the edge surface of the upper flange B of the guide member 10.

  The fall prevention stopper 12 follows the turning of the turning boom 3 and turns in the bridge girder width direction, enters the lower side of the upper flange B of the bridge girder A, and holds and holds the upper flange B of the bridge girder A from both sides. In this way, the vehicle body 1 is prevented from being lifted to prevent a worker from falling.

  The fall prevention stopper 12 is formed in a flat plate shape and is attached substantially horizontally to the lower side of each guide member 10. Further, the fall prevention stopper 12 is formed in a circular plate shape so as to always contact the lower surface of the upper flange B of the bridge girder A with the same area.

  The turning limiter 4 is composed of a slider 4a and a plurality of rods 4b and 4b. The slider 4a is inserted into a slide groove 1a formed in the center of the rear end side of the vehicle body 1 with a fixed length in the bridge axis direction. The slider 4a can freely slide in the slide groove 1a in the bridge axis direction and can be fixed at an arbitrary position in the bridge axis direction.

  As a structure for fixing the slider 4a, for example, a long hole (not shown) is formed in the bottom of the slide groove 1a in the bridge axis direction, and the male screw part that slides in the slide groove 1a in the bridge axis direction is formed in the slider 4a ( (Not shown). Then, fix the male screw part in the long hole with a fixing nut, or form a plurality of insertion holes (not shown) at regular intervals in the bridge axis direction at the bottom of the slide groove 1a. A structure in which the lower end portion of the slider 4a is inserted and fixed can be applied.

  The rods 4b and 4b are spanned between the slider 4a and the outer tube 3a of each turning boom 3, and both ends of each rod 4b and 4b are rotatably supported by the slider 4a and the outer tube 3a of each turning boom 3, respectively. Has been.

  Then, the rods 4b and 4b rotate following the turning movement of the turning booms 3 and 3 (broken line in FIG. 1), and accordingly the slider 4a moves in the slide groove 1a in the bridge axis direction. (Dashed line in FIG. 1).

  With such a configuration, the swiveling movement of the swivel booms 3 and 3 is limited to a certain range in the bridge axis direction on both sides of the bridge girder A, and the swiveling booms 3 and 3 are fixed and released in the swivel limiter 4. It can be done freely.

  Reference numeral 13 indicates that the two swivel booms 3 and 3 that cross in a plane X shape are swung around the same axis 8 and drawn in the width direction of the bridge beam A, and the guide members 10 and 10 at both ends are placed on the bridge beam A. It is a spring member that is brought into contact with the edge surface of the flange B.

  The spring member 13 is a coil spring, rubber, or the like, and is bridged in the bridge girder width direction between the middle portions of the swivel booms 3 and 3 positioned on the distal end side of the vehicle body 1, that is, between the distal ends of the outer tubes 3a and 3a. The both end portions are coupled to brackets 3c and 3c protruding from the side surfaces of the outer tubes 3a and 3a.

  The guide rollers 11 and 11 and the fall prevention stoppers 12 and 12 are always kept on the bridge girder A side through the swing booms 3 and 3 and the guide members 10 and 10, respectively.

  Thereby, the guide rollers 11 and 11 contact | abut to the edge end surface of the upper flange B of the bridge girder A, and can drive | work the edge end surface of the upper flange B to a bridge axis direction. Further, the fall prevention stoppers 12 and 12 are pushed down so that the upper flange B is held from both sides below the upper flange B of the bridge girder A, thereby preventing the vehicle body 1 from rising and the operator from falling.

  Reference numeral 14 denotes a handle for operating the turning boom 3, and the handle 14 is attached to the end of the turning boom 3. Reference numeral 15 denotes a handle for operating the turning limiter 4, and the handle 14 is attached to the upper end of the slider 4a. In addition, the lifeline of the safety belt worn by the worker can be tied to the column 2a of the handrail 2, the hand handle 2b, or the like.

  In such a configuration, when the mobile safety band mounting device according to the present invention is installed on the bridge girder A, the distance between the fall prevention stoppers 12 and 12 located on both the left and right sides of the bridge girder A is previously set on the bridge girder. A wider than the upper flange B of A.

  In this case, release of the turning booms 3 and 3 is released, and the turning booms 3 and 3 are turned outward in the width direction of the bridge girder so that the distance between the fall prevention stoppers 12 and 12 located on the left and right sides of the bridge girder A is increased. The width of the upper flange B of the bridge girder A can be made wider.

  Further, since the slider 4b of the turning limiter 4 for turning the turning booms 3 and 3 in this direction slides in the slide groove 4a in the distal direction, the slider 4b is fixed at the position after sliding. As a result, the swivel booms 3 and 3 are fixed and do not swivel back to their original positions.

  Next, the device is hung with a crane or the like and placed on the bridge girder A, and the slider 4b of the swing limiter 4 is loosened to release the swing booms 3 and 3 from being fixed.

  Then, the turning booms 3 and 3 are pulled by the spring member 13 around the same shaft 8 and turn to the bridge beam A side. Along with this, each guide roller 11, 11 attached to each guide member 10, 10 turns following the turning movement of the turning boom 3, 3 and abuts against the edge surface of the upper flange B of the bridge beam A, The edge surface of the upper flange B can travel in the bridge axis direction.

  Similarly, the fall-preventing stoppers 12 and 12 are driven so as to hold the upper flange B from the left and right sides below the upper flange B of the bridge girder A, thereby preventing the vehicle body 1 from lifting. Prevent accidents of workers falling.

  When moving the portion of the bridge girder A where the flange width changes, the guide rollers 11, 11 positioned on both sides of the bridge girder A are temporarily released. The fall-preventing stoppers 12 and 12 can easily pass by following the change in the flange width of the upper flange B while moving in the bridge girder width direction.

  INDUSTRIAL APPLICABILITY According to the present invention, in bridge work such as a road bridge, it is possible to prevent a worker who works on a bridge girder from falling and to improve the efficiency of work at a high place.

DESCRIPTION OF SYMBOLS 1 Car body 2 Handrail 2a Support | pillar 2b Handle 3 Turning boom 3a Outer tube 3b Inner tube 4 Turning limiter 4a Slider 4b Rod 5 Wheel 6 Bracket 7 Brake 7a Brake handle 8 Same axis 9 Connecting pin 10 Guide member 11 Guide roller 12 Fall prevention Stopper 13 Coil spring (spring member)
14 Brake handle 15 Swivel boom handle

Claims (6)

  A mobile safety belt attachment device for bridge construction to secure the safety belt of workers who work on the bridge girder, which turns in the plane with a plurality of wheels that run on the bridge girder in the direction of the bridge axis. Two swivel booms arranged in a cross shape, a guide member extending from both ends of the swivel boom to a lateral lower portion of the upper flange of the bridge girder, and swiveling in the width direction of the bridge girder following the swivel of the swivel boom A mobile safety band attachment device for bridge construction, comprising a plurality of fall prevention stoppers that enter the lower side of the upper flange of the bridge girder.   2. The mobile safety band attachment device for bridge construction according to claim 1, wherein the two swivel booms arranged in a cross shape are pulled in the width direction of the bridge girder, and the guide member comes into contact with an edge surface of an upper flange of the bridge girder. A mobile safety band attaching device for bridge construction, characterized by comprising a spring member.   3. The mobile safety band attachment device for bridge construction according to claim 1 or 2, wherein a guide that rotates in accordance with movement in a bridge axis direction is provided at a contact portion of the guide member with an edge surface of an upper flange of the bridge girder. A mobile safety belt attachment device for bridge construction, characterized by comprising a roller.   The mobile safety device for bridge construction according to any one of claims 1 to 3, further comprising a turning limiter for limiting the turning movement of the turning boom. Band attachment device.   The mobile safety band attachment device for bridge construction according to any one of claims 1 to 4, wherein the wheel has a size that allows a dowel projecting from an upper flange of a bridge girder to be displaced. Type safety belt mounting device.   In the mobile safety band attachment apparatus for bridge construction as described in any one of Claims 1-5, Between the attachment plate which connects a bridge girder between a stopper and the upper flange of a bridge girder, and the upper flange of a bridge girder A mobile safety band attachment device for bridge construction, characterized by being provided with a clearance of an amount to eliminate the step formed.

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