JP2020079534A - Guide device for underwater descending of cofferdam structure used in pier repair/reinforcement work - Google Patents

Abstract

To provide a guide device for underwater descending of a cofferdam structure used in a pier repair/reinforcement work which is also usable for a pier having such a shape that a diameter is not constant and a pier having an inclined shape.SOLUTION: A guide device for underwater descending of a cofferdam structure used in a pier repair/reinforcement work includes a rail 3 for descending installed on an outer peripheral surface of a pier 1, and a slide supporting arm 5 which projects inward from an inner peripheral surface of a cofferdam structure 2 toward the rail 3 for descending and has a slide member 4 capable of sliding through the rail 3 for descending on the tip of projection, is configured so that the cofferdam structure 2 can be descended and moved to the pier 1 by sliding the sliding member 4 on the tip of the slide supporting arm 5 along the rail 3 for descending, the slide supporting arm 5 is configured so as to be expandable/contractive, and elongation energization means 6 that always energizes the slide supporting arm 5 in an elongation direction is provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an underwater descent guide device for lowering a temporary cutoff structure used for repair/reinforcement work of a bridge pier provided in a water area such as a river or the sea into water under the bridge.

  For bridges spanning rivers, seas, and other waters, repair or reinforcement work will be performed if the piers become damaged due to aging or an earthquake.

  Specifically, a tubular temporary cutoff structure is built around the pier and lowered into the water, and water is stopped so that water does not enter the temporary cutoff structure to secure a working space (dry area). (For example, refer to Patent Document 1).

  As for the method of descending the temporary shutoff structure into water, a descending guide is installed on the pier and the temporary shutoff structure, and the temporary shutoff structure is descended via this descending guide. As this descending guide, descending rails having a length in the up-down direction are installed at a plurality of locations on the outer periphery of the pier, and an arm protruding from a plurality of locations of the temporary cutoff structure descends on these descending rails. By being movably connected, the temporary cutoff structure is configured to be able to move downward along the descending rail.

Japanese Patent No. 6273328

  The descent guide is intended to be used only for bridge piers that are vertically erected vertically and have a constant diameter dimension in almost all upper and lower ranges, so only arm lengths are available. It could not be used for piers with a slanted shape, piers with a constant diameter and a larger diameter toward the upper side or a shape with a larger diameter toward the lower side.

  The present invention finds out such a problem and attempts to solve the problem, and is a pier repair excellent in practicability that can be used for a pier with a shape with a non-uniform diameter or a pier with an inclined shape. (EN) Provided is an underwater descent guide device for a temporary shutoff structure used for reinforcement work.

  The gist of the present invention will be described with reference to the accompanying drawings.

  It is provided for the bridge pier 1 to be repaired and reinforced and the temporary cutoff structure 2 installed so as to surround the outer periphery of the bridge pier 1 for lowering the temporary cutoff structure 2 into the water under the bridge. And a descending rail 3 installed on the outer peripheral surface of the pier 1, and an inwardly protruding projecting inward from the inner peripheral surface of the temporary cutoff structure 2 toward the descending rail 3 and the descending rail at the protruding tip. 3 is provided with a sliding support arm 5 having a sliding member 4 capable of sliding, and the sliding member 4 at the tip of the sliding support arm 5 is slidably connected to the descending rail 3 so that the temporary cutoff structure 2 is attached to the pier 1. In the underwater descent guide device of the temporary cutoff structure used for repair and reinforcement work of bridge piers configured to be able to descend and move, the sliding support arm 5 is configured to be extendable and contractible, and the sliding support arm 5 is The present invention relates to an underwater descent guide device for a temporary shut-off structure used for bridge pier repair/reinforcement work, which is provided with extension urging means 6 that constantly urges in the extension direction.

  The sliding support arm 5 is composed of a long arm rod 7 and a movable body 8 which is provided at the tip of the arm rod 7 so as to be capable of projecting and retracting and has the sliding member 4 at the tip. On the other hand, the sliding support arm 5 is configured to be expandable and contractable by the movable body 8 moving in a projecting and retracting manner, and at the tip of the arm rod 7 and the movable body 8, the movable body 8 is projected in the protruding direction with respect to the arm rod 7. 2. An underwater descending guide device for a temporary cutoff structure used for bridge pier repair/reinforcement work according to claim 1, wherein an elastic body 6 is interposed as the extension urging means 6 for urging. is there.

  The sliding support arm 5 is a long arm rod 7 and a movable body 8 that is a tubular body that is fitted into the tip of the arm rod 7 so as to be capable of projecting and retracting, and that has the sliding member 4 at the tip. The sliding support arm 5 is configured to extend and contract by the movable body 8 projecting and retracting with respect to the arm rod 7, and the elastic body 6 as the extension urging means 6 is provided in the movable body 8. The elastic body 6 is interposed between the tip of the arm rod 7 and the sliding member 4 by incorporating the above, and the movable body 8 is biased in the protruding direction with respect to the arm rod 7 by this elastic body 6. According to any one of claims 1 and 2, the present invention relates to a guide device for underwater descent of a temporary cut-off structure used for bridge pier repair/reinforcement work.

  Since the present invention is configured as described above, even if the bridge pier to be repaired or reinforced has a shape with a non-constant diameter, it is extendable and retractable and is always urged in the extension direction by extension urging means. When the arm descends, the arm automatically expands and contracts following the outer shape of the pier, and the sliding member slides without separating from the descending rail, allowing the temporary cutoff structure to be stably lowered into the water under the bridge. Also, even if the pier for repair/reinforcement work has an inclined shape, it is possible to lower the temporary cutoff structure while holding it substantially horizontally by adjusting the sliding support arm for expansion and contraction. It is a guide device for underwater descent of a temporary cutoff structure used for bridge pier repair/reinforcement work that is extremely practical because it creates a work space that is easy to perform.

  Further, in the inventions according to claims 2 and 3, the pier repair of a structure having a more practical structure in which the extendable and retractable sliding support arm that reliably exhibits the above-mentioned effects can be easily realized by a simple structure. It becomes a guide device for underwater descent of the temporary cutoff structure used for reinforcement work.

It is a schematic explanatory front view which shows the state which dropped the temporary shutoff structure in water through a present Example. FIG. 2 is an explanatory plan view of FIG. 1. FIG. 6 is a partially enlarged front cross-sectional view showing an expanding/contracting structure of a sliding support arm and an urging structure by an extension urging means at the time of descending the temporary cutoff structure according to the present embodiment.

  A preferred embodiment of the present invention will be briefly described with reference to the drawings showing the operation of the present invention.

  A descent rail 3 is installed on the outer peripheral surface of the pier 1 to be repaired/reinforced, and from the inner peripheral surface of the temporary cutoff structure 2 installed so as to surround the outer periphery of the pier 1 toward the descent rail 3 When the sliding support arm 5 is provided so as to project inward, and the sliding member 4 at the projecting tip of the sliding support arm 5 is slidably connected to the descending rail 3, the sliding member 4 slides on the descending rail 3 so that the pier The temporary cutoff structure 2 can be moved downward with respect to 1.

  Further, at this time, even if the pier 1 to be repaired/reinforced has a shape with an inconstant diameter, the sliding support arm 5 that is extendable and is always urged in the extension direction by the extension urging means 6 is used. , When it descends, it automatically expands and contracts in accordance with the outer shape of the pier 1, and the sliding member 4 can slide without separating from the descending rail 3 to stably drop the temporary cutoff structure 2 into the water under the bridge. You can

  Further, at this time, even when the bridge pier 1 to be repaired/reinforced has an inclined shape, the temporary cutoff structure 2 is held substantially horizontal by adjusting the extendable and retractable sliding support arm 5 to extend and retract. The temporary cutoff structure 2 can be lowered or corrected so that the temporary cutoff structure 2 is in a substantially horizontal state after the drop, and a work space in which work can be easily performed can be formed in the temporary cutoff structure 2.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is used for the installation method of the temporary cutoff structure 2 used for repair/reinforcement work of the pier 1, and is installed so as to surround the pier 1 for repair/reinforcement work and the outer periphery of the pier 1. The present invention relates to an underwater descent guide device that is installed in the temporary shutoff structure 2 and is used to lower the temporary shutoff structure 2 into the water under the bridge. In addition, the pier 1 in the drawing is shown to have an elliptical cross section and a shape in which the diameter increases toward the lower side.

  The procedure for installing the temporary cutoff structure 2 will be described below.

  First, a work scaffold (not shown) is installed above the water surface of the pier 1 (non-submerged place). A floating body (floating pier) may be installed (floating) on the water surface around the target pier 1 for construction, and this floating body may be used as a work scaffold.

  Next, by using this scaffold for work, the tubular temporary cut-off structure 2 which is installed so as to surround the outer periphery of the pier 1 and through which the pier 1 can be disposed at the center is constructed.

  Specifically, the temporary cut-off structure 2 is formed into a cylindrical shape by combining and connecting a plurality of partition wall members 9 in the circumferential direction and the height direction of the pier 1.

  Next, for example, the balance holding balance 10 is installed above the pier 1, and the descending ropes 11 provided at several positions of the balance holding balance 10 are connected to the temporary cutoff structure 2 (see FIG. 1).

  Specifically, the balance-holding balance 10 is composed of a frame body, and several parts of the balance-balance 10 are connected to the suspension ropes 12 fixed to several parts of the wide upper part of the pier 1 to form a central space. It is installed horizontally above the bridge pier 1 while penetrating the bridge pier 1 through a part of the bridge pier 1, and further, there are several places of the balance balance 10 and the outer periphery of several places of the pier 1 corresponding thereto. The balance support balance 10 is installed so as to be incapable of swinging with respect to the pier 1 by arranging a pipe support (not shown) between the surface and the surface and stretching the pipe support.

  Further, each descent line 11 is configured to be capable of being moved up and down by an elevating device (not shown) such as a chain block, and the temporary shutoff structure 2 can be moved down to the balance holding balance 10 by the control of the elevating device. In this case, since the balance holding balance 10 connected through the descending rope 11 is fixed in a non-pivotable horizontal state at this time, the temporary cutoff structure 2 is hardly tilted. It is configured so that it can be lowered while being kept in an equilibrium state.

  Next, the underwater descent guide device of this embodiment is installed on the bridge pier 1 and the temporary cutoff structure 2.

  Explaining the underwater descent guide device, which is the main part of this embodiment, the descent rail 3 having a length in the up-down direction installed on the opposite side surface of the outer peripheral surface of the pier 1 and the inner circumference of the temporary cutoff structure 2. It comprises a sliding support arm 5 having a sliding member 4 projecting inwardly toward the bridge pier 1 at a facing portion of the surface and having a sliding member 4 fitted to the descending rail 3 and slidable at the protruding tip.

  More specifically, the descending rail 3 is made of a long metal material (groove-shaped steel material) having a groove-shaped (U-shaped) cross section, and the bottom of the groove is arranged along the outer peripheral surface of the pier 1 to make the pier 1 It is fixed in a vertically installed state (see FIGS. 1 and 2).

  Further, the descending rails 3 are fixed to the flat opposite side surfaces of the outer peripheral surface of the pier 1 at two locations on each side. That is, the descending rails 3 are fixed to a total of four locations on the outer peripheral surface of the pier 1 (see FIG. 2).

  On the other hand, the sliding support arm 5 is made of a long metal material, and the roller 4 adopted as the sliding member 4 is attached to the tip of the sliding support arm 5. The sliding member 4 is not limited to the roller 4 used in this embodiment, and the design can be changed as appropriate.

  Further, the sliding support arm 5 is constructed so as to horizontally project from the two opposite directions corresponding to the descending rail 3 on the inner peripheral surface of the temporary cut-off structure 2 inwardly at four locations. The sliding members 4 at the ends of the sliding support arms 5 at four locations are slidably fitted and connected to the four descending rails 3 fixed to the pier 1 (see FIG. 2).

  Further, as shown in FIG. 1, the sliding support arms 5 at the four positions are provided on the inner periphery of each of the ring-shaped wall material holding frames 16 arranged at the upper end and the middle of the temporary cutoff structure 2. It is projected from four points on the surface. That is, the sliding support arms 5 at the four positions are provided in the temporary shutoff structure 2 in two stages, upper and lower.

  Therefore, a total of eight sliding members 4 slide on the four (four) descending rails 3 so that the temporary cutoff structure 2 can smoothly descend and move with respect to the pier 1 while maintaining its posture. Is configured.

  Reference numeral 13 in the figure is a reinforcing frame that reinforces the horizontally projected state of the sliding support arm 5 and contributes to improving the shape retention strength of the temporary cutoff structure 2.

  In addition, the sliding support arm 5 of this embodiment is configured to be extendable and contractible, and is provided with extension urging means 6 that constantly urges the sliding support arm 5 in the extension direction.

  Specifically, the sliding support arm 5 is an arm rod 7 which is provided from the inner peripheral surface of the temporary cutoff structure 2 and is made of, for example, a metal long member having a U-shaped cross section and a projecting tip closed. And a movable body 8 in which a rectangular tubular body having a shape in which the protruding end of the arm rod 7 is slidably and slidably fitted and the protruding end is closed is configured as a long rod-shaped body. On the other hand, the sliding support arm 5 is configured to be expandable and contractible by the movable body 8 moving in and out.

  Further, as shown in FIGS. 2 and 3, a guide elongated hole 14 having a length along the projecting/retracting movable direction is penetratingly formed on each of the opposing side surfaces of the movable body 8, while the tip of the arm rod 7 is formed. A connecting pin 15 penetratingly disposed in the guide elongated hole 14 is provided on each of the opposite side surfaces of the guide protruding outwardly, and the connecting pin 15 is disposed in the guide elongated hole 14 in a state of being prevented from being pulled out. As a result, the movable body 8 is configured to be prevented from coming off from the arm rod 7, and the movable body 8 projects from the arm rod 7 within a range in which the guide elongated hole 14 can slide with respect to the connecting pin 15. It is configured so that it can be retracted and moved (the sliding support arm 5 can be freely expanded and contracted).

  Further, a roller 4 as the sliding member 4 is attached to the outer surface of the tip end portion (closed portion) of the movable body 8, and an elastic body 6 (as the extension urging means 6 is provided in the movable body 8). By incorporating the coil spring 6), the elastic body 6 is interposed between the tip of the arm rod 7 and the inner side surface of the tip of the movable body 8 in which the sliding member 4 exists. The movable body 8 is configured to be biased in the protruding direction (see FIG. 3).

  Therefore, the illustrated pier 1 is formed in a shape in which the diameter becomes larger toward the lower side, but as the temporary cutoff structure 2 descends, the urging force of the sliding member 4 (the movable body 8) against the elastic body 6 is resisted. The temporary shutoff structure 2 can be lowered into the water under the bridge.

  Although not shown, even when the bridge pier 1 to be repaired or reinforced has an inclined shape, the temporary cutoff structure 2 is substantially horizontal by adjusting the extendable and retractable sliding support arm 5 to extend and retract. The temporary shutoff structure 2 can be corrected so that the temporary shutoff structure 2 is in a substantially horizontal state after being lowered, and a work space in which work can be easily performed can be formed in the temporary shutoff structure 2.

  Next, the gap between the bottom of the temporary cutoff structure 2 and the pier 1 that has been lowered into the water is stopped by an appropriate water stop means (not shown), and after the water stop is completed, it enters the temporary cutoff structure 2. The existing water is drained, and the interior of the temporary cutoff structure 2 is used as a working dry area, and the construction is completed.

  It should be noted that the present invention is not limited to this embodiment, and the specific constitution of each constituent element can be designed as appropriate.

1 Bridge Pier 2 Temporary Cutoff Structure 3 Descent Rail 4 Sliding Member 5 Sliding Support Arm 6 Extension Energizing Means/Elastic Body 7 Arm Rod 8 Movable Body

Claims (3)

  A pier for repair/reinforcement work and a temporary cut-off structure installed around the perimeter of this pier to lower the temporary cut-off structure into the water under the bridge. Has a descending rail installed on the outer peripheral surface thereof, and a sliding member capable of sliding the descending rail at the projecting tip projecting inward from the inner peripheral surface of the temporary cutoff structure toward the descending rail. It is equipped with a sliding support arm, and the sliding member at the tip of the sliding support arm is slidably connected to the descending rail so that the temporary cut-off structure can be moved down the pier. In the underwater descending guide device of the temporary cutoff structure, the sliding support arm is configured to be extendable and contractible, and is provided with extension urging means for constantly urging the sliding support arm in the extension direction. A guide device for underwater descent of a temporary cutoff structure used for pier repair and reinforcement work.   The sliding support arm is composed of a long arm rod and a movable body provided at the tip of the arm rod so as to be capable of projecting and retracting, and having the sliding member at the tip thereof. The movable body is capable of projecting and retracting with respect to the arm rod. As a result, the sliding support arm is configured to be extendable and contractible, and the elastic body as the extension urging means for urging the movable body against the arm rod in the projecting direction is interposed between the tip of the arm rod and the movable body. The guide device for underwater descent of a temporary shut-off structure used for bridge pier repair/reinforcement work according to claim 1.   The sliding support arm is made up of a long arm rod and a movable body that is a cylindrical body that is movably fitted in the tip of the arm rod and that has the sliding member at the tip. On the other hand, the sliding support arm is configured to be expandable/contractible by moving the movable body in and out, and by incorporating an elastic body as the extension urging means in the movable body, the tip of the arm rod and the sliding member are provided. The pier repair/reinforcement work according to any one of claims 1 and 2, wherein an elastic body is interposed, and the movable body is biased by the elastic body in a protruding direction with respect to the arm rod. A guide device for underwater descent of the temporary cutoff structure used.

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