JP6592553B1 - Method of moving inside a bridge in a bridge structure and ladder for lateral movement used therefor - Google Patents

Abstract

An object of the present invention is to enable soil removal work by accessing the inside of a pier without assembling a scaffold. A step of connecting one end of a suspension rope HR to an upper portion of a lateral movement ladder 100 and lowering the suspension rope HR from a first side surface 6 side of a bridge surface to a first side surface 6 side of an abutment 2; OP1 moves the lateral movement ladder 100 in a state of being connected to the first rope RP1, and on the side surface of the abutment 2, the main leg is placed on both sides of the lower surface of the spar in a posture in which the locking portion 140 faces the lower surface of the spar. In the posture in which 110 is positioned, the step of fixing the engaging portion 140 of the lateral movement ladder 100 over the upper surface of the abutment 2 and the first operator OP1 outside the girders of the fixed lateral movement ladder 100 The horizontal movement ladder 100 is moved down from the side of the main leg 110 located at the side and moved on the side of the abutment 2 on the side of the abutment 2 toward the main leg 110 located on the inner side of the beam. And the laterally moving ladder along the main leg 110 located inside the beam Climbing the 00, and a step to move between the digits with each other. [Selection] Figure 4

Description

  The present invention relates to a method for moving inside a bridge in a bridge structure and a ladder for lateral movement used therefor.

  Structures such as bridges and tunnels need to be properly maintained, repaired, cleaned, etc. after construction. In order to avoid accidents due to deterioration over time, the road manager is required to periodically maintain the structure (hereinafter referred to as “maintenance work” in this specification). In particular, the Ministry of Land, Infrastructure, Transport and Tourism started on July 1, 2014, with the fall of the Chuo Expressway Choshi Tunnel ceiling plate that occurred on December 2, 2012. Must be checked once every five years.

  Among such bridge structures, the deterioration of the support section that supports the bridge is a problem for the maintenance work of the bridge. In general, as shown in the front view of FIG. 1, a bridge has a support portion 5 between an upper structure including a bridge girder 1 and a handrail 4 such as a main girder and a main structure and a lower structure such as an abutment 2 and a pier 3. It interposes and absorbs the expansion and contraction of the main girder and the like due to the influence of temperature change and improves the earthquake resistance. The support portion 5 is one of the most easily damaged members in the bridge due to the installed environment and function. An example of the support portion is shown in the longitudinal sectional view of FIG. This support part 5X is arrange | positioned between the abutment 2X and the main girder of the bridge girder 1X, and always receives the live load and dead load from a main girder, and repeats a movement and rotation. Since this support portion 5X is disposed on the back side of the main beam, it is a narrow closed space that is difficult to be exposed to direct sunlight and shadows, and has poor ventilation. On the other hand, earth and sand and rainwater flow down from the gaps and side surfaces of the main girder, and sediment SD such as earth and sand tends to accumulate. Further, rainwater is likely to be stagnated and the wet state results in an environment in which rusting and corrosion of the bearing portion is likely to occur.

  Therefore, maintenance management such as cleaning and washing, such as soil removal work for removing sediment from the bearings, is extremely important in bridge maintenance. It is considered that the life of the bridge can be greatly extended by removing the sediment and washing the bearings.

  Many small and medium bridges employ a steel plate girder as shown in the perspective view of FIG. In the case of such an abutment 2, an operator can get off on the outside of the abutment 2 relatively easily with a ladder.

  However, since the main girder's abdominal plate becomes a wall in the space between the main girder's abdominal plates called the inter-girder part, the operator cannot move from the outside of the abutment 2 as shown in FIG. . For this reason, it is difficult to investigate the state of the inter-girder part and to extend the life of the bridge.

  Here, if it is a short bridge with a height of about 2 or 3 m, maintenance work such as removal of earth and sand can be performed by climbing a ladder from under the abutment or pier. However, it is difficult to put a ladder on a tall bridge of 15m in height, and it was necessary to build a scaffold under the bridge girder or use an aerial work vehicle to perform maintenance work. .

  However, when using an aerial work vehicle, it is necessary to fix the aerial work vehicle to a part of the bridge surface side, which is the upper surface of the bridge girder. In other words, the economic loss due to traffic obstruction is large. In addition, a large number of aerial work vehicles are required for cleaning and inspection of many abutments and piers, which increases costs. Furthermore, in the case of a large abutment or pier, it is necessary to use a large work vehicle with a long arm of an aerial work vehicle, and it is necessary to occupy a plurality of lanes.

  On the other hand, when a scaffold is assembled, there is a problem that at least four workers or more are required for the installation work of the scaffold, and it takes a lot of labor and time, which leads to high maintenance work costs. It is said that there are about 700,000 bridges nationwide, and many are managed by local governments, and reducing the maintenance cost is an urgent issue.

Japanese Patent No. 6018691

  The present invention has been made in view of such a background. An object of the present invention is to provide a method of moving a bridge structure in a bridge structure that allows access to the inside of a bridge pier or the like without forming a scaffold, and a lateral movement ladder used therefor.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-described problem, the method for moving the bridge structure in the bridge structure according to the first embodiment of the present invention includes a bridge structure in which the bridge girder is arranged on the abutment via a support portion. A method of moving into the bridge for movement, wherein the first worker is arranged on the first side surface, which is one side surface in the width direction of the bridge girder, on the upper surface of the abutment of the bridge structure, Bridge the first rope through the bottom of the bridge girder between the first rail located on the first side of the bridge surface and the second rail located on the second side that is the side opposite to the first side. And a pair of main legs disposed on both sides, and the upper ends of the pair of main legs disposed between the pair of main legs in parallel with the main legs and spaced apart from each other, than the upper ends of the pair of main legs. A pair of lowered vertical bars, and spaced apart in parallel to each other so as to intersect the main legs and vertical bars A lateral movement ladder including a plurality of horizontal rails and a locking portion provided in a protruding position on the back side of the pair of main legs and vertical rails, and one end of a suspension rope is connected to the horizontal rope. A third operator connected to the upper part of the moving ladder and arranged on the first side of the bridge surface has the other end of the suspension rope, and the lateral moving ladder is connected to the first of the bridge surface. The step of lowering from the one side surface to the first side surface of the abutment, and the first operator moves the lateral movement ladder in a state of being connected to the first rope. Fixing the locking portion of the ladder for lateral movement over the upper surface of the abutment in a posture in which the main leg is positioned on both sides of the lower surface of the beam in a posture in which the portion faces the lower surface of the beam, and the first operation The person descends the lateral movement ladder from the main leg side located outside the beam of the fixed lateral movement ladder. And on the side of the abutment, on the side of the main leg located inside the girder, move laterally on the lateral movement ladder, and climb the horizontal movement ladder along the main leg located inside the girder. And a step of moving between them. As a result, it is normally blocked by the girders and the worker cannot move between the girders from the top of the abutment, but once descended below the girders using the lateral movement ladder, the side of the abutment without the girders After moving to the lower side between the girders and climbing the ladder for horizontal movement, it becomes possible to enter the inside of the girders avoiding the girders, and maintenance between the girders Can be done.

  Further, according to the method of moving the bridge structure in the bridge structure according to the second aspect of the present invention, in addition to the above, prior to the step of fixing the locking portion of the ladder for lateral movement over the upper surface of the abutment. The first operator may include a step of connecting the lateral movement ladder to the first rope. Thus, the first operator can smoothly perform the operation of moving the lateral movement ladder so that the main legs are positioned on both sides of the lower surface of the beam along the first rope.

  Furthermore, according to the moving method to the inside of the bridge in the bridge structure according to the third aspect of the present invention, in addition to any of the above, further, the first rope is first passed through the bottom surface of the bridge girder, A first rope attachment material for fixing one end of the first rope to the balustrade, and a second rope attachment material (b) for fixing the other end of the first rope to the second balustrade, respectively. The process of carrying out can be included. As a result, compared to the case where the first rope is directly fixed to the first rail or the second rail, the rail is damaged at the mounting position of the first rope by using the first rope mounting material and the second rope mounting material. The situation can be avoided.

  Furthermore, according to the method for moving the bridge structure in the bridge structure according to the fourth aspect of the present invention, in addition to any of the above, the bridge is further provided prior to the step of linking the first rope through the bottom surface of the bridge girder. A step of installing an elevating ladder for moving between the surface and the upper surface of the abutment on the first side surface and / or the second side surface may be included. Thereby, even if it is a bridge structure in which the ladder for descending to the upper surface of the abutment is not permanently installed, the worker can safely access the upper surface of the abutment.

  Furthermore, according to the method for moving into the bridge in the bridge structure according to the fifth embodiment of the present invention, in addition to any of the above, the step of linking the first rope through the bottom surface of the bridge girder Disposing a second worker on the second side surface, the second worker extending the tip end of the elongated bar toward the first worker outside the support portion; and A first operator receiving the tip side of the rod on the first side surface and connecting the first rope to the rod; and the second operator pulling the rod and Receiving the first rope connected to the distal end side.

  Furthermore, according to the method for moving into the bridge in the bridge structure according to the sixth aspect of the present invention, in addition to any of the above, the first operator further attaches the first rope to the rod. The step of connecting includes the step of connecting a lead rope, which is lighter than the first rope, connected to the tip of the first rope, to a wire connecting portion provided on the tip side of the rod, The step of the operator pulling the rod and receiving the first rope connected to the tip end side of the rod uses the lead rope connected to the tip end side of the rod using the rod and the second side surface. A step of pulling to the side, and after the second operator receives the lead rope, pulls the lead rope to the second side surface and pulls the first rope connected to the lead rope to the second side surface side. Process. As a result, instead of connecting the heavy first rope directly to the tip of the rod, connect the lightweight lead rope once to the tip of the rod, and then pull the lead rope with the rod to The delivery work can be performed from the sending side to the receiving side with a light force. Furthermore, after the second operator acquires the lead rope on the second side, it becomes easy to perform work requiring force on the lead rope at hand, so pull the lead rope and pull the heavier first rope. Is possible. In this way, instead of exchanging the heavy first rope directly, the lighter rope can be sent and received first, and this lead rope should be used to make the work smoother and safer. Can do.

  Furthermore, according to the moving method to the inside of the bridge in the bridge structure according to the seventh aspect of the present invention, in addition to any of the above, the step of moving the first operator between the girders. Prior to the second rope different from the first rope, including the step of crossing between the first side and the second side through the bottom surface of the bridge girder, the step of moving the first operator between the girders, The second rope can be connected to the first operator. As a result, the first rope is used for hanging the ladder for lateral movement, etc., while the second rope is used for the rope connecting the lifeline and the lifeline itself, thereby improving the safety of the first worker on the upper surface of the abutment. Can be increased.

  Furthermore, according to the moving method to the inside of the bridge in the bridge structure according to the eighth aspect of the present invention, in addition to any of the above, the first operator may further move between the girders. Continued,

  The second worker (B) may include a step of delivering a work bag along the first rope to the first worker (A) between the girders. Thereby, it becomes possible to put a tool and material required for work into a work bag, and to send it safely to the first worker between the girders.

  Furthermore, according to the method for moving into the bridge in the bridge structure according to the ninth aspect of the present invention, in addition to any of the above, the second rope is fastened with higher tension than the first rope. Can do. With the above configuration, of the two ropes on the underside of the bridge girder, the first rope used for transporting the ladder for lateral movement, etc. is gently connected to facilitate the work, while the second rope is in a taut state It can be suitably used as a safety net.

  Furthermore, according to the method for moving into the bridge in the bridge structure according to the tenth aspect of the present invention, in addition to any of the above, the locking part of the ladder for lateral movement is further fixed over the upper surface of the abutment. Prior to the step, the first operator includes a step of fixing a first anchor for fixing the lateral movement ladder to the upper surface of the abutment, and the locking portion of the lateral movement ladder is attached to the abutment The step of fixing over the upper surface may include the step of fastening the lateral movement ladder to the first anchor. Thereby, the ladder for horizontal movement can be securely fixed to the abutment using the first anchor, and the inspection and maintenance work in the vicinity of the abutment can be performed safely and effectively.

  Furthermore, according to the method for moving into the bridge in the bridge structure according to the eleventh aspect of the present invention, in addition to any of the above, the step of fixing the first anchor to the upper surface of the abutment includes: The first worker may include a step of drilling a hole for driving the first anchor on the upper surface of the abutment. As a result, the first worker can directly drill the hole at the site and securely fix the first anchor.

  Furthermore, according to the moving method to the inside of the bridge in the bridge structure according to the twelfth aspect of the present invention, in addition to any of the above, the step of moving the first operator between the girders Thereafter, the first operator fixes the second anchor between the girders on the upper surface of the abutment and on the first side surface, and the lateral movement ladder is tightly coupled to the second anchor. The process of carrying out can be included. As a result, in addition to the first anchor fixed to the outside of the underside of the spar, the ladder for lateral movement can also be fixed to the abutment more stably to the second anchor fixed between the spar. The reliability of the lateral movement ladder can be increased.

  Furthermore, according to the method of moving into the bridge in the bridge structure according to the thirteenth aspect of the present invention, in addition to any of the above, the step of moving the first operator between the girders After that, the first worker connects the first rope to the third anchor, and the step of fixing the third anchor to the second side surface between the girders on the upper surface of the abutment A process and a process of delivering a working bag to the first worker along the first rope may be included. Thereby, it becomes possible to put a tool and material required for work into a work bag, and to send it safely to the first worker between the girders.

  Furthermore, according to the moving method to the inside of the bridge in the bridge structure according to the fourteenth aspect of the present invention, in addition to any of the above, the step of moving the first operator between the girders Thereafter, the first worker can include a step of performing soil removal work between the girders. As a result, workers can move safely between girders that were difficult to access, and direct soil removal work can be performed, reducing and eliminating the problem of bridge girder corrosion caused by sedimentary sediment that has been difficult in the past. It is possible to maintain the goods.

  Furthermore, according to the moving method to the inside of the bridge in the bridge structure according to the fifteenth aspect of the present invention, in addition to any of the above, in the step of lowering the lateral moving ladder to the first side surface side of the abutment, Two suspension ropes are connected to the left and right of the upper part of the lateral movement ladder, respectively, and the lateral movement ladder is lowered to the upper surface of the abutment while adjusting the feeding amount of the plurality of suspension ropes. Can be. Thereby, it is possible to easily adjust the inclination posture of the lateral movement ladder by suspending the left and right sides of the lateral movement ladder with the suspension ropes.

  Furthermore, according to the ladder for lateral movement according to the sixteenth aspect of the present invention, the ladder for lateral movement used for moving between the girders of the bridge structure in which the bridge girders are arranged on the abutments via the support portions. A pair of main legs disposed on both sides, a pair of vertical bars disposed between the pair of main legs in parallel with the main legs and spaced apart from each other, and the main legs and the vertical bars A plurality of horizontal rails spaced apart in parallel posture so as to intersect with each other, and a locking portion provided in a posture protruding from the upper part on the back side of the pair of vertical rails, The vertical bars of the pair of vertical bars are longer than the lower surfaces of the girders, and the pair of vertical bars has an upper end lower than the upper ends of the pair of main legs, and the plurality of horizontal bars The upper ends of the pair of vertical beams protrude from the middle of the upper horizontal beam located at the upper end, and the pair of main legs and one The vertical beam is in a posture facing the side surface of the abutment parallel to the space between the girders, and the locking portion is opposed to the lower surface of the beam, and the lower surface of the beam is placed between the pair of vertical beams. The engaging portion can be hooked on the upper surface of the abutment so as to be sandwiched. With the above configuration, it is normally blocked by the girders and the operator cannot move between the girders from the top of the abutment. By moving the sideways in the horizontal direction and proceeding to the lower part between the girders, it is possible to enter the inside of the girders while avoiding the girders by climbing the ladder for lateral movement, and maintenance between the girders Can be performed.

  Furthermore, according to the ladder for lateral movement according to the seventeenth aspect of the present invention, in addition to any of the above configurations, the ladder further protrudes from the back side of the pair of main legs than the locking portion. Low spacers can be provided. With the above configuration, when the lateral movement ladder is put on the side surface of the abutment, the lateral movement ladder is held away from the side surface of the abutment by the spacer touching the side surface of the abutment, and the user puts his feet on the side rail. When placing, the space between the side rail and the abutment side makes it easy to put on the toe, and the sideways ladder can be easily raised and lowered.

  Furthermore, according to the ladder for lateral movement according to the eighteenth aspect of the present invention, in addition to any of the above configurations, the interval between the main leg and the vertical beam is substantially equal to the interval between the vertical beams. Can do.

It is a front view which shows the bridge structure using a support part. It is a schematic longitudinal cross-sectional view which shows a mode that the support part of a bridge deteriorates aged. It is the perspective view seen from diagonally downward which shows the abutment part of steel plate girders form. It is a schematic cross section which shows the state which fixed the ladder for horizontal movement which concerns on Embodiment 1 to the abutment. It is a front view which shows the ladder for horizontal movement which concerns on Embodiment 1. FIG. It is a side view of the ladder for horizontal movement of FIG. It is an end elevation in the VII-VII line of the ladder for horizontal movement of FIG. It is a top view of the ladder for horizontal movement of FIG. It is a perspective view which shows a mode that the ladder for horizontal movement of FIG. 5 was latched to the abutment. It is the perspective view which looked at FIG. 9 from the back side. It is a front view which shows the ladder for horizontal movement which concerns on Embodiment 2. FIG. It is a front view which shows the ladder for horizontal movement which concerns on Embodiment 3. FIG. It is a front view which shows the ladder for horizontal movement which concerns on Embodiment 4. FIG. It is a schematic cross section which shows a mode that a 1st rope is passed through the lower surface of a bridge girder between a 1st side surface and a 2nd side surface. It is a side view of the bridge structure of FIG. It is a perspective view which shows a mode that a rope attachment material is fixed to a 1st rail. It is a schematic cross section which shows a mode that a 2nd worker sends out a stick | rod to the 1st side surface side. It is a model top view which shows a telescopic stick | rod. It is a schematic plan view which shows a mode that a 2nd worker sends out a stick | rod to the 1st side surface side. It is a schematic cross section which shows the state where a 2nd worker draws a stick | rod. It is a schematic cross section which shows the state where a 2nd worker pulls a lead rope and draws a 1st rope. It is a schematic cross section which shows a mode that a 2nd worker sends out a fixed-type stick | rod to a 1st worker. FIG. 18 is a schematic cross-sectional view showing a state in which the first rope is bridged between the first side surface and the second side surface through the bottom surface of the bridge girder from the state of FIG. 17. It is a schematic cross section which shows the state which hung the 2nd rope on the lower surface of the bridge girder. It is a side view of FIG. It is a schematic cross section which shows the state which fixed the anchor. It is a side view of FIG. It is a schematic cross section which shows the state which suspends the ladder for horizontal movement. It is a schematic cross section which shows the state which fixed the ladder for horizontal movement to the abutment. FIG. 30 is a side view of FIG. 29. It is a schematic cross section which shows a mode that a 1st worker moves to a space | interval part. It is a schematic cross section which shows a mode that a 2nd anchor and a 3rd anchor are fixed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below is an example for embodying the technical idea of the present invention, and the present invention is not limited to the following. Moreover, this specification does not specify the member shown by the claim as the member of embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and reference sign indicate the same or the same parts, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
(Embodiment 1)

  The method for moving into the bridge according to the first embodiment of the present invention is as shown in the perspective view of FIG. 3, on the lower surface of the bridge girder 1 of the bridge structure, in which an operator is placed between the girders. It is a method for making it possible to move. Even if an operator tries to move between the girders from the upper surface of the abutment or the pier, the girders are obstructed as shown in FIG. In the bridge structure, earth and sand are accumulated in the inter-girder portion due to use over time, and corrosion occurs due to moisture contained in the earth and sand. For this reason, preventive maintenance of the bridge structure is achieved by performing maintenance work such as inspection of the inter-girder part between the girders and cleaning such as removal of earth and sand, and the bridge structure can be stably maintained over a long period of time. It can be used, and it is expected to reduce the maintenance cost of the bridge. However, as mentioned above, access to the inter-girder part is obstructed by the girder, so conventionally, work such as using an aerial work vehicle or building a scaffold under the girder is necessary, and maintenance work is not performed. It took a lot of time and money to prepare, and this was a burden for local governments and others who were bridge managers, and preventive maintenance was not progressing.

Therefore, in the first embodiment, as shown in FIG. 4, by using a lateral movement ladder 100 and fixing it to an abutment or a pier, an operator can move to an inter-girder part without assembling a scaffold. It is a thing. In the following description, a method of fixing the ladder for lateral movement to the abutment will be described, but it goes without saying that the present invention can be similarly applied to the pier. Therefore, in the present specification, for ease of explanation, unless otherwise specified, the abutment includes a pier.
(Ladder 100 for lateral movement)

  First, the lateral movement ladder 100 used in the method of moving into the bridge will be described with reference to FIGS. In these drawings, FIG. 5 is a front view showing the lateral movement ladder 100 according to the first embodiment, FIG. 6 is a side view of the lateral movement ladder 100 of FIG. 5, and FIG. 8 is an end view taken along the line VII-VII, FIG. 8 is a plan view of the lateral movement ladder 100 of FIG. 5, FIG. 9 is a perspective view showing a state in which the lateral movement ladder 100 of FIG. The perspective view which looked at FIG. 9 from the back side is each shown. The ladder 100 for horizontal movement shown in these drawings includes a pair of main legs 110 disposed on both sides, a pair of vertical bars 120 disposed between the pair of main legs 110, the main legs 110 and the vertical bars 120. And a plurality of horizontal rails 130 arranged so as to intersect with each other, and a locking portion 140 provided in a posture protruding from the upper part on the back surface of the pair of vertical rails 120. As shown in FIG. 31, which will be described later, the lateral movement ladder 100 is disposed below the girders that prevent the worker from moving to the inter-girder part, so that the lateral movement ladder 100 is temporarily lowered and the girder is lowered. It will be possible to climb after detouring and move safely and easily to the inter-girder part.

The lateral movement ladder 100 is preferably lightweight so that it can be easily suspended and delivered. Aluminum can be suitably used as a lightweight member that exhibits sufficient strength. Moreover, it may be made of resin or wood.
(Main leg 110)

The main legs 110 are provided on the left and right, respectively. The vertical bars 120 are arranged in parallel to the main legs 110 and separated from each other. In the example of FIG. 5, the interval between the main leg 110 and the vertical beam 120 is substantially the same as the interval between the vertical beams 120. As a result, the ladder 100 for lateral movement can be easily designed, and the operator can easily handle it during use.
(Horizontal crossing 130)

  On the other hand, the horizontal rails 130 are spaced apart in a parallel posture between the main legs 110 and the vertical rails 120. As a result, the worker can step up and down the ladder 100 for horizontal movement along the extending direction of the main leg 110 by putting his / her feet on the horizontal rail 130. Further, at least a part of the cross rail 130 passes between the main legs 110. In the example of FIG. 5, the lower horizontal beam 133 positioned at the lowermost end and the intermediate middle horizontal beam 132 are extended so as to connect the left and right main legs 110 respectively. Thus, by providing the horizontal rail 130 extended to the left and right, the operator can move in the horizontal direction along the horizontal rail 130 from one main leg 110 side to the other main leg 110 side. .

The extended horizontal rails 130 for moving in the lateral direction do not need to extend all of the horizontal rails as such, and some of the horizontal rails 130 are connected to the main legs 110 as shown in FIG. A short horizontal beam 134 having a short length passing only between the vertical beams 120 may be used. Accordingly, the number of members can be reduced, and the weight of the lateral movement ladder 100 can be reduced. Also, if there are many crosspieces, it becomes easy to interfere during transportation or storage, so convenience can be improved by minimizing the length of the long crosspieces. In the example of FIG. 5, it can be considered that two normal ladders are arranged side by side and separated from each other and partially connected by a horizontal rail.
(Embodiment 2)

However, the present invention is not limited to the configuration shown in FIG. 5. For example, like the lateral movement ladder 200 according to the second embodiment shown in FIG. 11, all the horizontal rails 130 are passed to the left and right main legs 110. It may be extended to
(Girder bottom guide part)

Further, the vertical beam 120 and the main leg 110 are fixed so that the upper end of each vertical beam 120 is lower than the upper end of each main leg 110. In the example of FIG. 5, since the lower ends of the main leg 110 and the vertical beam 120 are aligned, the vertical beam 120 is made shorter than the main leg 110. Further, among the plurality of horizontal bars 130, the upper horizontal bar 131 is fixed so that the upper ends of the pair of vertical bars 120 protrude from the middle of the upper horizontal bar 131 located at the upper end. Furthermore, as shown in FIG. 31 and the like, the interval between the pair of vertical bars 120 is longer than the width of the lower flange 1U which is the lower surface of the beam. Thus, the lower flange 1U is disposed in the space between the vertical bars 120, and the vertical rail 120 can be used as a guide for the lower flange 1U to position the ladder 100 for horizontal movement.
(Locking part 140)

  In addition, a locking portion 140 is provided on the back side of the pair of vertical bars 120. As described above, in the state where the horizontal movement ladder 100 is positioned using the space between the vertical bars 120 so that the lower flange 1U is sandwiched between the vertical bars 120 from both sides, It latches to the abutment 2 with the latching | locking part 140 so that it may extend below. As shown in the plan view of FIG. 8, the locking portion 140 protrudes from the back side of the lateral movement ladder 100. Further, in the examples of FIGS. 6, 7, 9, and 10, the locking portion 140 is fixed so as to protrude in a substantially perpendicular direction to the vertical beam 120 at a position slightly lowered from the upper end of the vertical beam 120. Accordingly, as shown in the cross-sectional view of FIG. 7, the locking portion 140 can be hooked on the upper surface of the abutment 2 and the lateral movement ladder 100 can be locked to the abutment 2.

  In addition, in order to stably fix the locking portion 140, a reinforcing portion 142 that is extended diagonally in a diagonal direction from the back of the upper end of the vertical beam 120 toward the edge of the locking portion 140 is fixed. As a result, the main legs 110 located at both ends of the lateral movement ladder 100 are also provided with the locking portions 140, and the lateral movement ladder 100 is locked at positions spaced apart in the width direction. Can be held. Further, by increasing the number of the locking portions 140, the strength of the locking portion 140 extended in the direction intersecting from the vertical beam 120 can be increased, and the lateral movement ladder 100 can be stably fixed to the abutment 2.

  In this lateral movement ladder 100, as shown in the plan view of FIG. 8 and the perspective views of FIGS. 9 and 10, the locking portion 140 is provided not only on the back surface of the vertical rail 120 but also on the back surface of the main leg 110. . In this manner, by providing the locking portions 140 on the back surfaces of the main legs 110, a total of four locking portions 140 are provided in addition to the locking portions 140 of the pair of vertical bars 120, which is stronger and more stable. Thus, the lateral movement ladder 100 can be locked to the abutment 2.

In addition, as shown in FIG. 8, it is not always necessary to provide four locking portions 140, and three or two or more locking portions 140 may be provided.
(Embodiment 3)

  Further, the length of the vertical beam does not necessarily have to be a length for passing the upper and lower horizontal beams. For example, the vertical beam 120C may be provided so as to protrude only above the upper horizontal beam 131 as in the horizontal movement ladder 300 according to the third embodiment illustrated in FIG.

In the example of FIG. 5, an example is illustrated in which the number of horizontal bars 130 is five, and the number of main legs 110 and vertical bars 120 are two and two, respectively. In the present invention, the number of horizontal rails and vertical rails can be appropriately set according to the girder of the bridge structure using the ladder for horizontal movement, the size of the abutment, and the like.
(Embodiment 4)

However, when the girder lower surface guide portion is omitted, a structure without a vertical beam may be used. Such an example is shown in the front view of FIG. 13 as a lateral movement ladder 400 according to the fourth embodiment. This lateral movement ladder 400 is provided with a horizontal rail 130 between a pair of main legs 110 in parallel. In this configuration, when the lateral movement ladder 400 is fixed below the spar, the operator adjusts the fixing position of the lateral movement ladder 400 so that the center of the lower surface of the spar is positioned approximately at the center of the main leg 110. . As an advantage, since the lower flange can be used as long as the width of the lower flange is sufficiently narrower than the width of the main legs, it can be flexibly used for bridge structures having different widths of the lower flange. Further, the configuration is simple and the manufacturing cost can be reduced.
(Spacer 150)

  Further, as shown in FIG. 6 and the like, a spacer 150 is projected on the back side of the main leg 110. The protrusion amount of the spacer 150 is made smaller than the protrusion amount of the locking portion 140. Accordingly, as shown in FIG. 7 and the like, when the lateral movement ladder 100 is locked to the abutment 2, the spacer 150 contacts the side surface of the abutment 2, and the spacer is placed between the lateral movement ladder 100 and the abutment 2 side surface. A gap corresponding to a length of 150 is formed. As a result, when the worker moves up and down or moves horizontally on the ladder 100 for horizontal movement, the space between the horizontal beam 130 and the side surface of the abutment 2 allows the toe to be fully inserted. Easy to apply.

As described above, when the ladder for lateral movement 100 is disposed on the side surface of the abutment 2, the pair of main legs 110 and the pair of vertical bars 120 face the side surfaces of the abutment 2 parallel to each other between the beams. The lower flange 1U can be sandwiched between the vertical bars 120. In this state, as shown in the end view of FIG. 7, the locking portion 140 can be hooked on the upper surface of the abutment 2.
(Moving method inside the bridge in the bridge structure)

Next, a method for moving an operator into the bridge of the bridge structure using the above-described ladder 100 for lateral movement will be described with reference to FIGS. In these drawings, FIG. 14 is a schematic cross-sectional view showing a state in which the first rope RP1 is passed between the first side surface 6 and the second side surface 7 through the lower surface of the bridge girder 1, and FIG. 15 is a side view of the bridge structure in FIG. 16 is a perspective view showing a state in which the rope attachment material 4C is fixed to the first rail 4A, FIG. 17 is a schematic cross-sectional view showing a state in which the second operator OP2 sends out the bar RR to the first side face 6 side, FIG. Is a schematic plan view showing the telescopic rod RR, FIG. 19 is a schematic plan view showing how the second worker OP2 sends the rod RR to the first side face 6, and FIG. 20 shows the second worker OP2 with the rod RR. FIG. 21 is a schematic cross-sectional view showing a state where the second operator OP2 pulls the lead rope LR and pulls the first rope RP1, and FIG. 22 shows a state where the second operator OP2 is fixed. How to send the bar RR to the first operator OP1 23 is a schematic cross-sectional view showing a state in which the first rope RP1 is bridged between the first side surface 6 and the second side surface 7 through the bottom surface of the bridge girder 1 from the state of FIG. 17, and FIG. 25 is a schematic sectional view showing a state where the rope RP2 is hung on the lower surface of the bridge girder 1, FIG. 25 is a side view of FIG. 24, FIG. 26 is a schematic sectional view showing a state where the anchor is fixed, FIG. 27 is a side view of FIG. Is a schematic sectional view showing a state in which the ladder 100 for horizontal movement is suspended, FIG. 29 is a schematic sectional view showing a state in which the ladder 100 for horizontal movement is fixed to the abutment 2, FIG. 30 is a side view of FIG. FIG. 32 is a schematic cross-sectional view showing how the first operator OP1 moves to the inter-girder part, and FIG. 32 shows a schematic cross-sectional view showing how the second anchor 42 and the third anchor 43 are fixed. Here, as shown in FIG. 3 and the like, a state where the operator cannot move directly from the upper surface of the abutment 2 to the inter-girder part, that is, a state where the movement of the bridge girder 1 to the inter-girder part is hindered is considered.
(Installation work of the first rope RP1)

First, on the upper surface of the abutment 2, the first side surface 6 side which is one side surface in the width direction of the bridge girder 1, and the other side surface in the width direction of the bridge girder 1 which is opposite to the first side surface 6. The first rope RP1 is bridged through the bottom surface of the bridge girder 1 between the second side surface 7 side. Here, as shown in FIG. 14, the first height rail 4 </ b> A located on the first side surface 6 (right side in FIG. 14) and the second height rail 4 </ b> B located on the second side surface 7 (left side in FIG. 14). Consider an example in which both ends of the first rope RP1 are bridged. First, the first worker OP1 is disposed on the first side surface 6 side, and the second worker OP2 is disposed on the second side surface 7 side. A third operator OP3 is disposed on the first side surface 6 side of the bridge surface. In this state, the third operator OP3 connects the first rope RP1 to the first rail 4A.
(Rope mounting material 4C)

  Although the first rope RP1 can be directly connected to the first rail 4A, a rope attachment material 4C can be prepared as another member for attaching the rope. For example, as shown in FIG. 15 and FIG. 16, the first rope mounting member 4C1 is set on the first handrail 4A in a state where it is placed on an appropriate base such as one or a plurality of square members as necessary. The first rope RP1 is fixed to the one rope attachment member 4C1. With this method, it is possible to avoid situations where the first rail 4A is inadvertently damaged, distorted or bent as compared with the method in which the first rope RP1 is directly attached to the first rail 4A. Note that the height of the first rope attachment member 4C1 in cross-sectional view need not coincide with the height of the horizontal rail and can be adjusted as appropriate.

  As the first rope mounting member 4C1, a metal pipe, a wooden or resin bar, a square, or the like can be used. By disposing the first rope attachment material 4C1 on the inner side of the first rail 4A, the first rope RP1 is disposed on the outer side of the first rail 4A. If necessary, the first rope attachment member 4C1 is fixed to the inside of the vertical rail of the first rail 4A by instructing it from the lower surface with a square bar or by fastening it to the first rail 4A with a string. One end of the first rope RP1 is fastened and fixed to the first rope attachment member 4C1.

  The other end of the first rope RP1 is handed over to the second side surface 7 in a procedure to be described later, and then connected to the second rope attachment 4C2 attached to the second rail 4B by the third operator OP3. The 2nd rope attachment material 4C2 can be comprised similarly to a 1st rope attachment pipe.

  After the first operator OP1 fixes one end of the first rope RP1 on the bridge surface side, the first operator OP1 moves to the upper surface of the abutment 2 and transfers the other end of the first rope RP1 to and from the second operator OP2. Can also be done. In addition, the second operator OP2 moves to the bridge surface side while holding the other end of the first rope RP1 while receiving the other end of the first rope RP1, or the first operator OP1 moves to the bridge surface. It is possible to move to the second side surface 7 side and receive the other end of the first rope RP1 from the second operator OP2 and connect it to the second rope attachment 4C2. In this case, the third worker can be omitted.

  In this way, with one end of the first rope RP1 fixed to the first side surface 6 side of the bridge surface, the other end of the first rope RP1 is hung from the bridge surface to the upper surface side of the abutment 2, and the upper surface of the abutment 2 The first operator OP1 located on the first side face 6 side receives this. Then, the first operator OP1 performs the delivery operation with the second operator OP2 located on the second side surface 7 side of the upper surface of the abutment 2 at the other end of the first rope RP1.

As described above, on the upper surface of the abutment 2, as the two workers, the first worker OP1 is disposed on the first side surface 6 side, and the second worker OP2 is disposed on the second side surface 77 side. In general, since the bridge girder 1 is placed on the upper surface of the abutment 2 via the support portion 5 as shown in FIG. 3, the bridge girder 1 obstructs the operator to move freely on the upper surface of the abutment 2. I can't. Therefore, the first worker OP1 and the second worker OP2 are respectively arranged in the space formed on the upper surface of the abutment 2 and on both side surfaces of the bridge girder 1.
(Installation work of lifting ladder 30)

  In order for the worker to move to the upper surface of the abutment, a ladder or a staircase that is permanently installed in the bridge structure in advance is used. When such lifting means is not permanently installed, a lifting ladder 30 is laid as shown in FIG. The lifting ladder 30 has a sufficient length that can reach the upper surface of the abutment 2 from the bridge surface. Thereby, even if it is a bridge structure in which the raising / lowering means for descending to the upper surface of an abutment is not permanently installed, an operator can access the upper surface of an abutment safely.

Then, the other end of the first rope RP1 is moved from the first worker OP1 to the second worker OP2 side. Here, the second worker OP2 receives the first rope RP1 from the first worker OP1 using the bar RR. First, as shown in FIG. 17, the second operator OP2 extends the tip end side of the elongated bar RR toward the first operator OP1. On the other hand, the second operator OP2 receives the distal end side of the bar RR and connects the first rope RP1 to the bar RR. Thereafter, the first operator OP1 draws the rod RR again and receives the first rope RP1 connected to the tip side of the rod RR. Thereby, the operation | work which delivers 1st rope RP1 by the upper surface of the abutment and bridge pier which an operator cannot move freely obstructed by a bridge girder can be performed safely.
(Bar RR)

  Here, the rod RR is preferably telescopic as shown in FIG. A wire connection portion WF for connecting a wire is provided on the distal end side of the rod RR. Thereby, it is possible to connect the wires with a simple configuration and draw the wires. On the other hand, it is desirable that the bar RR be lightweight so that the operator can easily handle it.

For the telescopic rod RR, a rod material that can be expanded and contracted in a rod manner can be used. For example, a lightweight and flexible material such as a fishing rod can be suitably used. The length which can be expanded and contracted is set according to the width of the bridge girder 1 and can be extended to about several meters. For example, the length can be varied to about 50 cm to 5 m. In addition, the telescopic operation of the bar RR may be a manual type or an electric type. By using such a telescopic rod RR, it can be used to feed out while gradually extending on the upper surface of the abutment. In addition, when not in use, it shrinks and is not bulky and has excellent portability.
(Wire connection part WF)

As the wire connecting portion WF, a configuration capable of connecting wires can be used as appropriate. For example, a hook that can be bent into a claw shape or an L shape to lock the wire, or an annular ring or ring that can be partially opened and closed, can be used as the wire connection portion WF. The wire connection portion WF is preferably fixed to the tip edge of the rod RR, but may not be necessarily the tip, for example, may be fixed at a position slightly spoken from the tip.
(Region RN)

  The first worker OP1 can use the side surface side of the support portion 5 on the upper surface of the abutment 2 as an area for passing the bar RR to the second worker OP2 side. As shown in the plan view of FIG. 19, in general, the support portion 5 is not disposed at the edge of the upper surface of the abutment 2 but is often disposed at a distance d from the edge. Therefore, in this space, that is, in the upper surface of the abutment 2, the region RN between the portion where the support portion 5 is arranged and the edge of the abutment 2 is used as a region where the rod RR is placed. The second operator OP2 is a gap between the bridge beam 1 and the abutment 2 as shown in the sectional view of FIG. 17, and between the support portion 5 and the edge of the abutment 2 as shown in the plan view of FIG. The tip is sent out toward the first worker OP1 through the bar RR into the intermediate region RN. For example, the second worker OP2 extends the bar RR toward the first side surface 6 side where the first worker OP1 is, while gradually extending the bar RR by hand.

In particular, the second worker OP2 is obstructed by the bridge girder 1 and cannot see through the first side face 6 side, and the bar RR must be sent out to the first worker OP1 while the visibility is poor. Therefore, by using the region RN between the support portion 5 and the edge of the abutment 2 and placing the rod RR on it, the work load on the second operator OP2 is reduced. Can be done easily. Also, for the first worker OP1 who receives the tip of the bar RR, it is possible to grasp in advance the part to which the tip of the bar RR delivered from the second worker OP2 whose appearance is difficult to see is delivered. In this way, even in a narrow work space, the work can be performed safely and reliably.
(Lead rope LR)

  When the first worker OP1 receives the tip of the rod RR sent out from the second worker OP2, the first worker OP1 connects the first rope RP1 to the rod RR. Here, the first rope RP1 can be directly connected, but preferably a lead rope LR that is lighter than the first rope RP1 is interposed. That is, one end of the lead rope LR is connected to the first rope RP1, and the other end of the lead rope LR is attached to the tip of the rod RR. Then, as shown in FIG. 20, the second operator OP2 draws the rod RR toward him, passes the lead rope LR through the lower surface of the bridge girder 1, pulls out the lead rope LR on the second side surface 7 side, and then pulls the rod RR. The lead rope LR is removed from the tip of the lead rope LR, and the other end side of the lead rope LR is received. Here, the length of the lead rope LR is made longer than the lateral width of the bridge girder 1. That is, when the lead rope LR is passed through the lower surface of the bridge girder 1, the first rope RP1 is not yet drawn. Thus, when the second operator OP2 pulls the bar RR, the weight of the first rope RP1 is not applied, and the weight of the light lead rope LR and the bar RR can be suppressed, and the workability is excellent.

  The lead rope LR is preferably connected to the tip of the first rope RP1 in advance. For example, before the first rope RP1 is dropped, the lead rope LR is connected on the bridge surface side, which is the upper surface of the bridge girder 1. If it is this, since it can work in a wide safe place, efficiency of work is achieved.

  In this way, with the lead rope LR passed through the lower surface of the bridge girder 1, the second operator OP2 pulls the lead rope LR by hand, and the first rope RP1 connected to one end side of the lead rope LR is connected to the first rope LR. Pull to the side 7 side. At this time, like the lead rope LR, the first rope RP1 may be pulled in a state of being placed on the region RN between the support portion 5 and the edge of the abutment 2, but is not necessarily in a state of being placed on the upper surface of the abutment. It is not necessary to maintain, and as shown in FIG. Since the second operator OP2 has already removed the lead rope LR from the rod RR and directly gripped it, it is possible to pull the lead rope LR in a posture where it is easy to put a force on the hand, and the first rope RP1 to the abutment 2 etc. There is no need to support it.

  With this method, the second operator OP2 can pull the lead rope LR with a light force, rather than attaching the heavy first rope RP1 directly to the tip end of the rod and pulling the rod. Then, after pulling the lead rope LR from the tip of the bar RR, the lead rope LR can be pulled directly to pull the first rope RP1 closer to the hand. In addition, when pulling the heavy first rope RP1, it is possible to work with a lead rope LR having a high degree of freedom instead of a rod whose movement is restricted, so that the second operator OP2 can easily apply force. Since the rod is not used, it becomes easier to move, so the workability is greatly improved. In this way, the advantage that the work can be performed more smoothly and safely can be obtained by interposing the lighter lead rope LR instead of directly exchanging the heavy first rope RP1. In other words, the lead rope LR can be physically transferred from the sending side to the receiving side with a light force when pulled by the rod RR through the lightweight lead rope LR. After acquisition, it is possible to easily perform work requiring force on the lead rope LR at hand. As a result, safety is improved, work efficiency is improved, and work can be performed in a shorter time, which can contribute to reduction of labor costs and the like.

  In the above example, the method in which the second operator OP2 uses the bar RR to draw the first rope RP1 has been described. However, the present invention is not limited to this. For example, the first operator side uses the bar to The rope RP1 may be sent to the second worker. For example, the first operator connects the lead rope LR to the tip end side of the rod, and sends the tip end side of the rod toward the second operator side. The second worker can receive the first rope by removing the lead rope LR from the tip of the bar upon receiving the tip of the rod and similarly pulling the lead rope LR.

  Furthermore, although the telescopic rod RR is used in the above example, it is not necessarily required to be telescopic, and a rod having a fixed length may be used. In this case, the second operator OP2 puts the rod on the upper surface of the abutment and gradually feeds it, or as shown in FIG. 22, the second operator OP2 pushes the rod FR on the side of the bridge girder and the tip of the rod FR. Is sent from the side of the abutment or from below the abutment to the first worker. When the first worker receives the tip end side of the rod FR by hand, the lead rope LR can be connected to the tip end side of the rod FR and sent out to the second worker OP2 side in the same manner. The rod FR is preferably lightweight so that it can be swung sufficiently without support. If this method is used, the rod can be used for the delivery of the wire without using a telescopic type. However, since it is bulky when the rod is not used, a process such as placing the rod on the bridge surface is required.

  Alternatively, the second operator may perform the operation of connecting the lead rope LR to the tip end side of the rod, in addition to causing the first operator to perform the operation. For example, as shown in FIG. 22, the lead rope LR is hung vertically downward on the first side face 6 side so that the second operator OP2 can visually recognize the position of the lead rope LR even from the second side face 7 side. To do. In this state, the second operator OP2 operates the tip of the rod FR and hooks a hook, which is a wire connecting portion at the tip of the rod FR, onto the lead rope LR. And after hooking, the rod FR is operated and the lead rope LR is brought close to hand. After receiving the lead rope LR on the second operator OP2 side, it is possible to pull the lead rope LR and draw the first rope RP1 in the same manner. With this method, the first worker can be dispensed with.

  Alternatively, the first rope RP1 can be directly delivered from the first worker OP1 to the second worker OP2 side located on the opposite side without using a tool such as a bar. For example, the first worker OP1 manually operates the first rope RP1 and throws it toward the second worker OP2 side located on the opposite side. Here, the tip of the first rope RP1 is swung like a pendulum in the manner of a Tarzan rope. For example, from the state where the tip of the first rope RP1 is hung on the side surface of the abutment 2, the first operator OP1 grasps the middle of the first rope RP1 and pulls the second side surface 7 where the second operator OP2 is located. Shake a lot in a pendulum style toward the side. As a result, the tip of the first rope RP1 swings greatly from the first side face 6 side to the second side face 7 side by drawing a parabola due to the weight of the hook fixed to the tip end. It hits the bottom of the bridge girder 1 from the right side of, and tries to rise further on the left side. As a result, since the first rope RP1 reaches the second side surface 7 side where the second operator OP2 is located, the second operator OP2 can easily receive it. Alternatively, the first worker may throw the tip of the first rope directly toward the second worker and pass it. For example, the first worker throws the first rope RP1 toward the second worker in the manner of throwing the lower hand.

  In this way, the first rope RP1 is held in a state of being passed from the first side surface 6 side to the second side surface 7 side through the lower surface of the bridge girder 1. Here, as shown in FIG. 23, the third operator OP3 on the upper surface of the bridge girder 1, that is, on the bridge surface side moves to the second side surface 7 side, and from the second operator OP2 to the other end side of the first rope RP1. Receive the tip. If necessary, the third operator OP3 holds the tip of the first rope RP1 so as not to be accidentally dropped by locking the tip of the first rope RP1 to the second rail 4B.

  Note that the second operator OP2 may perform the operation of connecting the other end of the first rope RP1 to the second rail 4B. For example, the second operator OP2 moves from the upper surface of the abutment to the bridge surface while holding the tip of the first rope RP1, and himself connects the tip of the first rope RP1 to the second rail 4B and the second rope attachment pipe. To do. Alternatively, the fourth worker is arranged in advance on the second side surface of the bridge surface, and the fourth worker receives the tip of the first rope from the second worker and holds the second rope on the second side surface. You may go.

  In this way, the first rope RP1 can be bridged between the first side surface 6 and the second side surface 7 through the bottom surface of the bridge girder 1 as shown in FIG. If this method is used, the first rope RP1 is rotated between the first side surface 6 and the second side surface 7 by turning the bottom surface of the bridge structure relatively easily and safely without preparing special equipment. It can be built.

  In general, unlike the movement of the abutment to the base, the worker moves to the upper surface of the abutment by placing a ladder 30 between the bridge surface and the upper surface of the abutment as shown in FIG. This can be done relatively safely by using a ladder. On the other hand, movement to the base side instead of the upper surface of the abutment may have a considerable difference in altitude or may be dangerous depending on the installation location of the bridge structure. On the other hand, in the suspension scaffold erection method according to the present embodiment, there is an advantage that the erection work can be completed only by movement to the upper surface of the abutment that can be moved safely and easily.

Also, with this method, most of the work can be completed by a few workers (two in this case). In other words, even with a small number of people, it is possible to safely carry out the suspension scaffolding work, which contributes to labor saving and cost reduction, and, in turn, can contribute to enhancement of inspection and maintenance of bridges, longer life, and ensuring safety.
(Installation work of the second rope RP2)

  As described above, the first rope RP <b> 1 can be passed between the first side surface 6 and the second side surface 7 through the lower surface of the bridge girder 1. In addition to the first rope RP 1, the second rope RP 2 can be passed between the first side surface 6 and the second side surface 7 through the lower surface of the bridge girder 1. In particular, the first rope RP1 is used for suspending the lateral movement ladder 100, feeding out tools and materials necessary for the work, etc., while the second rope RP2 is used as a lifeline when the first worker OP1 moves. By using it as a guard rope, the safety of the first worker OP1 on the upper surface of the abutment can be enhanced.

  The second rope RP2 can be hung by the same method as the first rope RP1 described above. In this case, besides the first rope RP1, the second rope RP2 may be laid next, the first rope RP1 may be laid after the second rope RP2 is laid first, and the first rope RP1 and the second rope RP2 may be simultaneously attached. You may proceed so that you can hang it. Preferably, after one of the ropes is laid first, the other rope can be laid along this, so that the work of handing the rope can be saved. For example, a hook like an eggplant is hooked on one of the ropes that has been previously hung on the first side face 6 side, and the other rope is connected to the hook and sent out to the second side face 7 side. From the second side surface 7 side, it is possible to feed smoothly by pulling the tip with a heel using the above-described bar or the like.

As shown in FIGS. 24 and 25, the second rope RP <b> 2 is tightly attached and tightly pasted between the first side surface 6 and the second side surface 7 through the lower surface of the bridge girder 1. Thereby, it becomes easy to hang a lifeline on the second rope RP2. On the other hand, the first rope RP1 passes between the first side surface 6 and the second side surface 7 in a relaxed state.
(Buffer material 20)

In addition, when the second rope RP2 is tightened over the bottom surface of the bridge girder 1, the first rope RP1 contacts the lower surface of the bridge girder and the corners of the side surface. If the first rope RP1 shifts between the bridge girder during operation in this state, the first rope RP1 may be worn or damaged. Therefore, as shown in FIG. 24, the cushioning material 20 may be arranged at the corner of the bridge girder 1. As a result, the first rope RP1 can be prevented from touching the bridge girder 1 directly, and wear can be reduced. In the example of the figure, the cushioning material 20 has a plate shape formed in an L shape in cross section so as to cover the lower end corner of the bridge girder 1. However, the shape of the cushioning material 20 is not limited to this, and may be, for example, a C-shape or U-shape in cross-section that sandwiches the corner of the H steel shape, or a pulley shape that guides the first rope RP1. The buffer material 20 may be made of a material excellent in lubricity, such as Teflon or fluororesin.
(anchor)

  In addition, an anchor can be fixed to the upper surface of the abutment 2. The anchor is used when the lateral movement ladder 100 is fixed to the abutment 2. Or it can utilize also as a site | part which stretches 1st rope RP1. The anchor is fixed by, for example, drilling a hole for driving the anchor into the upper surface of the abutment 2. In this way, the operator can directly fix the anchor at a desired position by directly drilling the hole at the site. For example, the lateral movement ladder 100 and the first rope RP1 are fixed or connected by winding a wire or chain around a bolt head or a screw hole of an anchor bolt or locking a hook.

  In the example shown in FIGS. 26 and 27, the first operator OP <b> 1 drives the first anchor 41 toward the first side surface 6 side on the upper surface of the abutment 2. Using this first anchor 41, the lateral movement ladder 100 is fixed. Moreover, the 2nd operator OP2 may drive in a 4th anchor to the 2nd side 7 side as needed.

The operation of fixing the first anchor 41 can be performed at an arbitrary timing as long as it is before the lateral movement ladder 100 is suspended. For example, it may be performed before the delivery work of the first rope RP1 or before the delivery work of the second rope RP2. Preferably, it is performed after the delivery work of the second rope RP2. Accordingly, when the first worker OP1 performs the fixing work, the second rope RP2 can be used as a guard rope, and safety can be improved.
(The process of hanging the ladder 100 for horizontal movement)

As described above, in the state where the first rope RP1 and the second rope RP2 are passed between the first side surface 6 and the second side surface 7 through the lower surface of the bridge girder 1, the lateral movement ladder 100 is suspended from the bridge surface. Lower and move to the upper surface of the abutment 2. First, the lateral movement ladder 100 shown in FIG. 5 and the like is prepared and positioned on the first side surface 6 side of the bridge surface. A hanging rope HR is connected to the upper part of the lateral movement ladder 100 in advance. For example, one end of the hanging rope HR is fastened to the upper horizontal rail 131.
(Hanging rope HR)

  In this state, as shown in FIG. 28, the third operator OP3 located on the first side surface 6 side of the bridge surface hangs the lateral movement ladder 100 with the other end of the suspension rope HR, and slowly And down. On the other hand, the first worker OP1 located on the first side surface 6 side of the upper surface of the abutment 2 has the lateral movement ladder 100 lowered from above positioned on the side surface side through the upper surface of the abutment 2 from the bridge surface. As such, the ladder 100 for lateral movement is received. At this time, the first worker OP1 connects a lifeline to the second rope RP2 to ensure work safety.

  The number of hanging ropes HR is not limited to one, and a plurality of hanging ropes HR may be prepared. For example, two suspension ropes HR are connected to the left and right of the upper part of the lateral movement ladder 100, respectively, and the lateral movement ladder 100 is adjusted to the upper surface of the abutment 2 while adjusting the feeding amount of the plurality of suspension ropes HR. It may be lowered. As a result, the left and right sides of the lateral movement ladder 100 can be suspended by the suspension rope HR, and the inclination posture of the lateral movement ladder 100 can be easily adjusted.

  Further, the lateral movement ladder 100 is connected to the first rope RP1. Here, the first worker OP1 connects the lateral movement ladder 100 lowered from above to the first rope RP1. For example, the upper horizontal rail 131 and the first rope RP1 are connected using a basket such as an eggplant. This facilitates the operation of moving the lateral movement ladder 100 from the first rope RP1 of the abutment 2 toward the lower surface of the bridge girder 1 along the first rope RP1, which is a subsequent operation.

In addition, the operation | work which connects 1st rope RP1 to the ladder 100 for horizontal movement can also be performed by 3rd operator OP3. For example, in a state where the first rope RP1 is connected to the lateral movement ladder 100 in advance, the first rope RP1 may be suspended by the suspension rope HR and moved to the upper surface side of the abutment 2.
(Step of moving the horizontal movement ladder 100 in the horizontal direction)

  When the lateral movement ladder 100 is moved from the bridge surface to the upper surface of the abutment 2 in this way, the first operator OP1 moves the lateral movement ladder 100 to the lower surface of the bridge girder 1 along the first rope RP1. . That is, the first worker OP1 moves the lateral movement ladder 100 moved from the top to the bottom by the third worker OP3 from the first side surface 6 side toward the lateral direction below the bridge girder 1.

  The first operator OP1 holds the suspension rope HR on the upper surface of the abutment 2 and suspends the lateral movement ladder 100 downward from the upper surface of the abutment 2, and uses the first rope RP1 to move from the side surface of the abutment 2 toward the center. Move to. At this time, the ladder 100 for lateral movement is set so that the locking portion 140 faces the side surface of the abutment 2 parallel to the space between the beams. When the lateral movement ladder 100 is moved laterally in this state, as shown in FIG. 28, the lateral movement is performed so that the main leg 110 on the left side of the lateral movement ladder 100 does not interfere with the lower flange 1U on the underside of the beam. The ladder 100 is further lowered. As described above, unlike the second rope RP2, the first rope RP1 is gently stretched from the first rail 4A to the second rail 4B. The main leg 110 can be submerged below the lower flange 1U, and the lateral movement ladder 100 can be moved further leftward. In this way, the lower flange 1U is positioned at the intermediate portion between the main legs 110 in a posture where the left main leg 110 exceeds the lower flange 1U. That is, the main legs 110 are positioned on the left and right sides of the lower flange 1U, and the locking portion 140 of the lateral movement ladder 100 is locked and fixed to the upper surface of the abutment 2 as shown in FIG. As shown in FIG. 30, the locking portion 140 protrudes substantially vertically from the rear surface on the upper side of the vertical rail 120, so that the horizontal movement ladder 100 can be obtained by placing the locking portion 140 on the upper surface of the abutment 2. Is retained. Further, a spacer 150 protrudes from the back surface of the ladder 100 for lateral movement, and the spacer 150 is in contact with the side surface of the abutment 2 so that the vertical beam 120 is stably held in a vertical posture along the side surface of the abutment 2. At the same time, a space is formed between the lateral movement ladder 100 and the side surface of the abutment 2, and a stroke is ensured when an operator puts his or her foot on the horizontal rail 130.

In this state, the lateral movement ladder 100 is fixed to the first anchor 41 as necessary. For example, as shown in FIG. 30, the upper horizontal rail 131 of the lateral movement ladder 100 is fastened to the screw head of the driven first anchor 41. As a result, it is possible to avoid a situation where the lateral movement ladder 100 is unexpectedly detached.
(The process of moving to the inter-girder part)

  In this state, the first operator OP1 moves from the first side surface 6 side of the upper surface of the abutment 2 to the inter-girder portion between the beams using the lateral movement ladder 100. Here, as shown in FIG. 31, the first operator OP1 moves from the main leg 110 side (the right side in FIG. 29) located outside the beam of the main legs 110 of the lateral movement ladder 100 to the horizontal rail 130. And go down the ladder 100 for lateral movement. Then, the first operator OP1 is in a state where the first operator OP1 is lowered to the lower horizontal rail 133 of the lowermost stage of the lateral movement ladder 100 or the head of the first operator OP1 is moved to a position lower than the lower flange 1U. It moves in the horizontal direction along the horizontal rail 130 of the ladder 100 for horizontal movement. Then, after passing under the lower flange 1U avoiding the bridge girder 1 and moving to the main leg 110 side (left side in FIG. 29) located inside the girder, the lateral movement ladder 100 is moved along the main leg 110. Ascend, get off the lateral movement ladder 100 and move to the inter-girder part.

In this way, if the operator cannot normally move between the girders from the upper surface of the abutment 2 by being obstructed by the girders, the traversing ladder 100 is used to go down to the lower side of the girders. It is possible to enter the inside of the girders while avoiding the girders by moving the side surface of the abutment 2 without moving to the lower side between the girders and then climbing the ladder 100 for lateral movement.
(Process to perform maintenance work)

Then, the first worker OP1 who has moved to the inter-girder portion performs maintenance work on this part. For example, soil removal work is performed to remove the sediment accumulated in the inter-girder part. As a result, it is possible to move the workers safely between the girders that were difficult to access and perform direct soil removal work, thus reducing and eliminating the problem of bridge girder corrosion caused by sedimentary sediment that has been difficult in the past. The structure can be maintained. As a result, it is possible to access the girder part in a simple manner without the need for scaffolding or work at aerial platforms, reducing the cost and duration of bridge maintenance work and thereby promoting bridge maintenance. By extending the life of bridges and reducing maintenance costs, it can contribute to the maintenance and management of social infrastructure with limited resources.
(Second anchor 42)

Moreover, in order to fix the ladder 100 for horizontal movement more stably, the 2nd anchor 42 can be provided in the upper surface of the abutment 2 of an interstitial part. For example, as shown in FIG. 32, after the first worker OP1 moves between the girders, the second anchor 42 is fixed to the first side face 6 side of the upper surface of the abutment 2 between the girders. Similar to the first anchor 41, the second anchor 42 is drilled and fixed on the upper surface of the abutment 2. Then, the lateral movement ladder 100 is fixed to the second anchor 42. Further, as the method of fixing the lateral movement ladder 100 to the second anchor 42, as in the first anchor 41, a method of fastening and tightening a wire using a screw head or a hole of the anchor can be used. Thereby, in addition to the first anchor 41 fixed to the outside of the lower flange 1U, which is the lower surface of the spar, the second anchor 42 fixed to the inter-girder part is also used, so that the ladder for lateral movement on the left and right sides of the spar 100 can be fixed and the ladder 100 for lateral movement can be further stably held.
(Third anchor 43)

  In addition, a third anchor 43 for holding the first rope RP1 can be provided in the inter-girder portion. In the example shown in FIG. 32, the first operator OP <b> 1 that has moved to the inter-girder portion fixes the third anchor 43 on the second side surface 7 side in the upper surface of the abutment 2. Then, the first rope RP1 is connected to the third anchor 43. By doing in this way, from the third operator OP3 on the bridge surface side along the first rope RP1, tools, materials, etc. necessary for the operation are put in a work bag, and the first operator OP1 in the inter-girder part Can be sent out easily. If necessary, a fourth anchor 44 may be provided on the upper surface of the abutment 2 and outside the bridge beam 1.

  These anchors can be provided in advance when the bridge structure is constructed.

  According to the erection method of the present invention, it can be suitably used as a scaffold for inspecting bridges and cleaning work and an erection method thereof.

100, 200, 300, 400 ... Ladder for lateral movement 1 ... Bridge girder; 1U ... Lower flange 2 ... Abutment 3 ... Pier 4 ... High rail; 4A ... First high rail; 4B ... Second high rail 4C ... Rope mounting material; 4C2 ... second rope attachment material 5, 5X ... support portion 6 ... first side surface 7 ... second side surface 20 ... cushioning material 30 ... lifting ladder 41 ... first anchor 42 ... second anchor 43 ... third Anchor 44 ... Fourth anchor 110 ... Main legs 120, 120C ... Vertical beam 130 ... Horizontal beam 131 ... Upper horizontal beam 132 ... Middle horizontal beam 133 ... Lower horizontal beam 134 ... Short horizontal beam 140 ... Locking part 142 ... Reinforcement part 150 ... Spacer SD ... Deposit OP1 ... First worker OP2 ... Second worker OP3 ... Third worker RP1 ... First rope RP2 ... Second rope HR ... Suspension rope LR ... Lead rope WF ... Wire connection part RR, FR ... stick

Claims (18)

A method of moving into the bridge to move between the girders of the bridge structure in which the bridge girders are arranged via the support on the abutment,
A first balustrade located on the first side surface of the bridge surface, wherein the first worker is disposed on the first side surface of the bridge structure on the first side surface which is one side surface in the width direction of the bridge girder. A step of linking the first rope through the bottom surface of the bridge girder between the second rail located on the second side that is the side opposite to the first side;
A pair of main legs arranged on both sides;
A pair of vertical rails arranged between the pair of main legs in parallel with the main legs and spaced apart from each other, the upper ends of which are lower than the upper ends of the pair of main legs,
A plurality of horizontal bars arranged in parallel with each other so as to intersect the main legs and the vertical bars,
A locking portion provided in a projecting posture on the back side of the pair of main legs and the vertical rail,
And a third operator disposed on the first side surface of the bridge surface by connecting one end of the suspension rope to an upper portion of the ladder for lateral movement. A step of lowering the ladder for lateral movement from the first side surface side of the bridge surface to the first side surface side of the abutment,
The first worker moves the ladder for lateral movement in a state of being connected to the first rope, and on both sides of the lower surface of the spar in a posture where the engaging portion faces the lower surface of the spar on the side surface of the abutment In a posture in which the main leg is positioned at a position where the locking portion of the ladder for lateral movement is fixed to the upper surface of the abutment,
The first worker descends the lateral movement ladder from the main leg side located outside the girders of the fixed lateral movement ladder and is located inside the girders on the side surface of the abutment. Moving laterally on the lateral movement ladder on the leg side, climbing the lateral movement ladder along the main leg located inside the beam, and moving between the beams;
To move inside the bridge. A method of moving into a bridge in a bridge structure according to claim 1, further comprising:
Prior to the step of fixing the latching portion of the ladder for lateral movement over the upper surface of the abutment,
The moving method to the inside of a bridge in a bridge structure including the process of said 1st operator connecting the said ladder for horizontal movement to said 1st rope. A method of moving into a bridge in a bridge structure according to claim 1 or 2, further comprising:
Prior to the process of hanging the first rope through the bottom of the bridge girder,
In the first rail, the first rope attachment material (a) for fixing one end of the first rope,
A method for moving a second rope attachment member (b) for fixing the other end of the first rope to a second rail in a bridge structure including a step of fixing each of the second rope attachment members (b). A method for moving into a bridge in the bridge structure according to any one of claims 1 to 3, further comprising:
Prior to the process of hanging the first rope through the bottom of the bridge girder,
A moving method into a bridge in a bridge structure including a step of installing a lifting ladder for moving between a bridge surface and an upper surface of an abutment on the first side surface and / or the second side surface. A method of moving into a bridge in the bridge structure according to any one of claims 1 to 4,
The process of hanging the first rope through the bottom of the bridge girder,
Place the second worker on the second side of the upper surface of the abutment,
The second worker extends the tip end of the elongated bar toward the first worker outside the support portion; and
The first operator receives the tip side of the rod on the first side surface and connects the first rope to the rod;
The second operator pulls the rod and receives the first rope connected to the tip side of the rod, and the moving method to the inside of the bridge in the bridge structure. A method of moving into a bridge in a bridge structure according to claim 5, further comprising:
The step of connecting the first rope to the rod by the first worker,
A step of connecting a lead rope, which is lighter than the first rope, connected to the tip of the first rope, to a wire connecting portion provided on the tip side of the rod;
The second worker draws the rod and receives the first rope connected to the tip side of the rod,
Drawing the lead rope connected to the tip side of the rod to the second side surface using the rod;
After the second operator receives the lead rope, pulling the lead rope to the second side surface, and drawing the first rope connected to the lead rope to the second side surface;
Of moving inside a bridge in a bridge structure including A method of moving into a bridge in a bridge structure according to claim 5 or 6 , further comprising:
Prior to the step of moving the first worker between the girders,
Crossing a second rope different from the first rope between the first side and the second side through the bottom surface of the bridge girder,
In the step of moving the first worker between the girders,
A method of moving a bridge structure in a bridge structure formed by connecting the second rope to a first worker. A method for moving into a bridge in a bridge structure according to claim 7, further comprising:
Following the step of moving the first worker between the girders,
A method of moving into a bridge including a step of delivering a work bag along the first rope to a first worker between the girders of the second worker. A method for moving into a bridge in the bridge structure according to claim 7 or 8,
A method for moving a bridge structure in a bridge structure formed by binding the second rope with higher tension than the first rope. A method for moving into a bridge in the bridge structure according to any one of claims 1 to 9, further comprising:
Prior to the step of fixing the latching portion of the ladder for lateral movement over the upper surface of the abutment,
The first operator includes a step of fixing a first anchor for fixing the lateral movement ladder on an upper surface of the abutment,
The step of fixing the latching portion of the ladder for lateral movement over the upper surface of the abutment,
A method of moving a bridge structure in a bridge structure including a step of binding the lateral movement ladder to the first anchor. A method of moving into a bridge in a bridge structure according to claim 10, further comprising:
Fixing the first anchor to the upper surface of the abutment,
A method of moving a bridge structure into a bridge, comprising a step in which the first operator drills a hole for driving the first anchor on an upper surface of the abutment. A method for moving into a bridge in a bridge structure according to claim 10 or 11, further comprising:
After the step of moving the first worker between the girders,
The first operator is a step of fixing the second anchor between the beams on the upper surface of the abutment and on the first side surface side;
A method of moving a bridge structure in a bridge including a step of binding the lateral movement ladder to the second anchor. A method of moving into a bridge in a bridge structure according to claim 12, further comprising:
After the step of moving the first worker between the girders,
The first operator is fixing the third anchor between the beams on the upper surface of the abutment and on the second side surface;
Connecting the first rope to the third anchor;
A moving method into the bridge including a step of delivering a working bag to the first worker along the first rope. A method of moving into a bridge in a bridge structure according to any one of claims 1 to 13, further comprising:
After the step of moving the first worker between the girders,
A method of moving inside the bridge, including a process in which the first worker performs soil removal work between girders. A method of moving into a bridge in the bridge structure according to any one of claims 1 to 14,
In the step of lowering the lateral movement ladder to the first side of the abutment,
Two hanging ropes are connected to the left and right of the upper part of the ladder for lateral movement,
A method of moving a bridge structure in a bridge structure in which the ladder for lateral movement is lowered to the upper surface of the abutment while adjusting the feed amount of the plurality of suspension ropes. It is a ladder for lateral movement used for moving between the girders of the bridge structure in which the bridge girders are arranged on the abutment via the support part,
A pair of main legs arranged on both sides;
A pair of vertical rails arranged between the pair of main legs and spaced apart from each other in parallel with the main legs;
A plurality of horizontal bars arranged in parallel with each other so as to intersect the main legs and the vertical bars,
A locking part provided in a protruding position from the upper part on the back side of the pair of vertical bars,
With
The pair of vertical bars has an interval longer than the lower surface of the beam, and the pair of vertical bars has an upper end lower than the upper ends of the pair of main legs,
The upper ends of the pair of vertical bars protrude from the middle of the upper horizontal bars located at the upper end of the plurality of horizontal bars,
The pair of main legs and the pair of vertical bars are in a posture facing the side surface of the abutment parallel to the space between the beams, and the locking portion is in a posture facing the lower surface of the beam. A ladder for lateral movement in which the locking portion can be hooked on the upper surface of the abutment so that the lower surface of the girder is sandwiched therebetween. The ladder for lateral movement according to claim 16, further comprising:
A ladder for lateral movement provided with a spacer that protrudes from the back side of the pair of main legs and is lower than the locking portion. The ladder for lateral movement according to claim 16 or 17,
A lateral movement ladder in which a distance between the main leg and the vertical beam is substantially equal to an interval between the vertical beams.

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