JP6273328B1 - Installation method of temporary closing structure used for bridge pier repair and reinforcement work - Google Patents

Abstract

An object of the present invention is to provide an installation method for a temporary closing structure that can be easily constructed on the water, and that can be easily lowered into the water. A suspension scaffold 2 is installed in a non-submerged area above the pier 1 and a through-hole portion 4 through which the pier 1 penetrates is provided in the suspension scaffold 2 so as to surround the outer periphery of the pier 1. The temporary closing structure 3 to be installed is constructed, the lowering guide 5 is installed on the pier 1 and the temporary closing structure 3, and the temporary closing structure 3 is attached to the pier 1 via the lowering guide 5 below the bridge. The gap between the through-hole portion 4 at the bottom of the temporary cutoff structure 3 and the outer periphery of the pier 1 is stopped by the water stopping means 6, and after the water stop is completed, the temporary cutoff structure 3 enters the temporary cutoff structure 3. The entering water 7 is drained, and the inside of the temporary cut-off structure 3 is used as a work dry area. [Selection] Figure 2

Description

  The present invention relates to an installation method of a temporary closing structure used for repair / reinforcement of a pier provided in a river or the sea.

  Bridges over rivers, seas, etc. are repaired and reinforced when their piers are damaged due to aging or earthquakes.

  Specifically, a cylindrical temporary fastening structure is constructed around the pier, and a working space (dry area) is secured by preventing the water from entering the inside by this temporary fastening structure (for example, Patent Documents) 1).

JP 2008-297748 A

  Generally, the temporary cutoff structure is constructed in a cylindrical shape by combining and connecting a plurality of divided wall members in the circumferential direction and the height direction of the pier. Most of them are performed underwater by divers.

  However, underwater work is very troublesome, the work period is prolonged, and it is dangerous.

  The present invention relates to an improvement in the installation method of the temporary closing structure used for such bridge pier repair and reinforcement work, and the temporary closing structure can be easily constructed on the water. It is intended to provide a method for installing a temporary closing structure used for pier repair / reinforcement work with excellent practicality, in which the work of descent into water can be performed easily.

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

A suspension scaffold 2 is installed in a non-submerged area above the pier 1, and this suspension scaffold 2 is provided with a work bottom 10, and the suspension pier 2 having the work bottom 10 is inserted through the pier 1 at the bottom. The temporary closing structure 3 is provided so as to be provided so as to surround the outer periphery of the pier 1, and the lowering guide 5 is installed on the pier 1 and the temporary closing structure 3 . The guide 5 is configured such that a descent rail 11 having a length in the vertical direction is installed on the outer periphery of the pier 1, and the temporary cutoff structure 3 can be moved down along the descent rail 11. After the work bottom 10 of 2 is removed, the temporary fastening structure 3 is lowered into the water under the bridge with respect to the pier 1 through the lowering guide 5, and the through-hole part 4 at the bottom of the temporary fastening structure 3 The gap between the pier 1 and the outer periphery is stopped by the water stopping means 6 and temporarily tightened after the water stop is completed. According to the installation method of the temporary closing structure used for pier repair / reinforcement work, characterized in that the water 7 entering the cutting structure 3 is drained and the temporary closing structure 3 is used as a work dry area. Is.

  In addition, after constructing the temporary closing structure 3, the balance holding balance 8 is installed above the pier 1, and the descending ropes 9 provided at several places on the balance holding balance 8 are connected to the temporary closing structure 3. The descent guide 5 is installed on the pier 1 and the temporary cut-off structure 3, and the temporary cut-off structure 3 is lowered from the balance holding balance 8 through the descent cable 9, so that the descent guide The pier repair according to claim 1, wherein the temporary closing structure 3 is lowered into the water under the bridge while maintaining the substantially closed state by lowering the temporary closing structure 3 with respect to the pier 1 through 5. -This is related to the installation method of temporary cut-off structures used for reinforcement work.

The descent guide 5 projects inwardly toward the pier 1 at a descent rail 11 installed at least on an opposite portion of the outer periphery of the pier 1 and at least an opposite portion in the temporary cut-off structure 3. The pier repairing / amending method according to any one of claims 1 and 2 , further comprising: a sliding support arm 12 having a sliding member 13 which can be slid by fitting to the lowering rail 11 at a protruding tip. This relates to the installation method of the temporary cutoff structure used for the reinforcement work.

The temporary cutoff structure 3 is combined with a plurality of divided wall members 15 in the circumferential direction and the height direction of the pier 1 on the outer peripheral edge of the bottom plate member 14 provided with the through-hole portion 4 in the center. It is connected and comprised by the bottomed cylinder shape, It concerns on the installation method of the temporary closing structure used for the pier repair and reinforcement work of any one of Claims 1-3 characterized by the above-mentioned.

The water stop means 6 includes a water stop sheet 16 disposed between the through hole 4 at the bottom of the temporary cutoff structure 3 and the bridge pier 1, and is wound around the water stop sheet 16. And a fastening line 17 that closely attaches the water stop sheet 16 to the outer peripheral surface of the pier 1 by pulling, and a moving part 18 of the fastening line 17 is provided at the upper part of the temporary cutoff structure 3. The traction portion 18 of the fastening line 17 is configured to be operated at a position above the water surface 19 below the bridge. 5 . This is related to the installation method of temporary cut-off structures used for pier repair and reinforcement work.

In the present invention, as described above, a suspension scaffold is installed at a non-submerged location above the pier, and this suspension scaffold has a working bottom, and the suspension pier with the working bottom penetrates the pier at the bottom. Since the provisional cut-off structure that is installed so as to surround the outer periphery of the pier is constructed, the suspension scaffold can be used on the water (non-submersible) without requiring troublesome underwater work by divers. Can be constructed easily and in a short period of time, and a descent guide is installed on the bridge pier and the temporary cut-off structure, and this descent guide has a vertical descent rail. Is installed on the outer periphery of the pier, and the temporary cutoff structure is configured to be able to move down along the rail for descent.After removing the working bottom of the suspension scaffold, Easy construction of temporary cut-off structure constructed with Then, it can be stably lowered and installed in the water.After that, the gap between the through-hole portion at the bottom of the temporary closing structure and the outer periphery of the pier is stopped by water-stopping means. The construction method of the temporary closing structure used for pier repair / reinforcement work with excellent workability and excellent practicality that can make the temporary closing structure body into a dry work area by draining the water entering the deadline structure; Become.

  According to a second aspect of the present invention, a descent cable provided at several places on the moving balance holding balance is connected to the temporary cut-off structure, and the temporary cut-off structure is connected to the balance holding balance via the descent cable. In addition to the descent guide action of the descent guide, the pier repair and reinforcement work with more practicality can be stably lowered in a substantially balanced state without tilting the temporary closing structure. This is an installation method for the temporary cutoff structure to be used.

Further, in the invention of claim 3 , the temporary guide used for bridge pier repair / reinforcement work that is more practical and can be easily realized by simplifying the construction of the descent guide that surely exhibits the above-mentioned actions and effects. It becomes the installation method of the structure.

Further, in the invention according to claim 4 , the temporary fastening structure used for the pier repair / reinforcement work more excellent in practicality can be easily realized by designing the temporary fastening structure having excellent constructability with a simple configuration. It becomes an installation method.

Further, in the invention described in claim 5 , it is possible to stop the gap between the through-hole portion at the bottom of the temporary closing structure and the outer periphery of the pier by simple operation, and this water stopping operation is a troublesome underwater operation. This is an installation method of a temporary closing structure used for pier repair / reinforcement work, which has a simple structure and can be easily realized by designing a water stop means that can be performed on the water without any problems.

It is explanatory drawing which shows the state which installed the suspension scaffold on the bridge pier of a present Example. FIG. 2 is an explanatory diagram illustrating a state in which a temporary cutoff structure is constructed on the suspension scaffold and connected to the balance for balance holding, and a descent guide is installed on the temporary cutoff structure and the pier, following FIG. 1. Continuing from Fig. 2, the working bottom of the suspension scaffold is removed, the temporary closing structure is lowered into the water under the bridge via the lowering guide, and the suspension bracket is fixed to the bridge pier to lift the temporary closing structure. It is explanatory drawing which shows the state which prevented. It is explanatory drawing which shows the state which stopped the water gap (primary water stop) with the water stop means from the through-hole part of a temporary cutoff structure bottom part, and the pier outer periphery following FIG. FIG. 5 is an explanatory diagram showing a state where secondary water is stopped and water in the temporary cutoff structure is drained to make the temporary cutoff structure as a work dry area, following FIG. 4. It is explanatory plan view which shows the connection structure of the balance for balance holding | maintenance of a present Example, and the balance for balance holding | maintenance, and a temporary cutoff structure. It is explanatory plan view which shows the guide for descent | fall of a present Example. It is explanatory perspective view which shows the water stop means (water stop tube abbreviation) of a present Example. It is a description perspective view from another angle which shows the water stop means (water stop tube abbreviation) of a present Example. It is a description partial expanded sectional view which shows the water stop means of a present Example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

A suspension scaffold 2 provided with a working bottom 10 is installed at a non-submerged location above the pier 1, and a through-hole portion 4 is provided in the suspension scaffold 2 so as to penetrate the pier 1 at the bottom. The temporary cutoff structure 3 installed so that it may surround is constructed | assembled.

That is, the temporary fastening structure 3 can be easily and quickly constructed on the water (non-submerged area) using the suspension scaffold 2 provided with the work bottom 10 without requiring troublesome underwater work by a diver. Can do.

Next, the descent guide 5 is installed on the pier 1 and the temporary closing structure 3, and the working bottom 10 of the suspension scaffold 2 is removed, and then the temporary closing structure is mounted on the pier 1 via the lowering guide 5. Drop 3 into the water under the bridge.

Specifically, in this lowering guide 5, a lowering rail 11 having a length in the vertical direction is installed on the outer periphery of the pier 1, and the temporary closing structure 3 moves downward along the lowering rail 11. It is configured to be possible.

  That is, the temporary closing structure 3 can be easily and stably lowered by the lowering guide 5 and installed in the water.

  Next, the gap between the through hole 4 at the bottom of the temporary closing structure 3 and the outer periphery of the pier 1 is stopped by the water stopping means 6 and enters the temporary closing structure 3 after the water stop is completed. The water 7 is drained, the inside of the temporary closing structure 3 is used as a work dry area, and an operator can perform repair / reinforcement work of the pier 1 in the work dry area.

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

  The present embodiment relates to an installation method of the temporary closing structure 3 used for repairing / reinforcing the pier 1 of a bridge over a river or the sea. Although the drawing shows a cylindrical pier 1, the present invention is not limited to the installation method on the pier 1, and the shape of the temporary closing structure 3 is appropriately set according to the shape of the pier 1. The design can be changed.

  The installation procedure will be described below.

  First, as shown in FIG. 1, a suspension scaffold 2 is installed at a non-submerged location above the pier 1.

  Specifically, the suspension scaffold 2 is installed so as to surround the entire periphery of the upper portion of the pier 1 and is disposed around the pier 1, for example, a work bottom portion 10 having a ring shape in plan view (work The floor is provided, and the work space of the worker on the upper part of the pier 1, that is, on the water is secured.

  Next, the suspension scaffold 2 is provided with a through-hole portion 4 through which the pier 1 is disposed at the bottom, and a temporary closing structure 3 is constructed so as to surround the outer periphery of the pier 1.

  Specifically, the temporary closing structure 3 includes a plurality of divided wall members 15 in the circumferential direction and height of the pier 1 on the outer peripheral edge of the bottom plate member 14 provided with the through-hole portion 4 in the center. It is combined in the direction and connected to form a bottomed cylinder.

  In addition, the temporary closing structure 3 first constructs the bottom plate material 14 in a ring shape around the bridge pier 1 on the suspension scaffold 2.

  The bottom plate 14 has a ring-shaped metal inner frame 26 attached to the inner edge of the ring-shaped and plate-like floor plate 34 in plan view, and a ring-shaped metal outer frame 33 on the outer edge of the floor plate 34. Attached to the plate-shaped body.

  In addition, the bottom plate member 14 is provided with recesses 35 whose upper surface is lowered by one step at four locations that are substantially equidistant in the circumferential direction. In each recess 35, two guide rollers 27 described later are provided. (See FIGS. 8 and 9).

  The bottom plate 14 is placed on the work bottom 10 of the suspension scaffold 2, and then the curved plate liner plate 15 as the divided wall member 15 is placed on the outer periphery of the bottom plate 14 around the pier 1. By forming a cylindrical enclosure wall 20 having a required height by combining and connecting in a plurality of directions and height directions, the bottomed cylindrical temporary fastening structure 3 is constructed (see FIG. 2).

  Further, the connecting structure of the bottom plate member 14 and the divided wall member 15 is such that the outer frame 33 is formed in an H-shaped cross section, and the divided wall member 15 is fitted and connected to the upper groove portion of the outer frame 33 ( (See FIG. 8).

  Next, the balance-holding balance 8 is installed above the pier 1, and the descending ropes 9 provided at several places on the balance-holding balance 8 are connected to the temporary closing structure 3.

  Specifically, as shown in FIG. 6, the balance-holding balance 8 is composed of a square frame in plan view, and its four corners (four corners) are the wide upper part of the pier 1. By being connected to suspension ropes 21 fixed at four locations, the bridge pier 1 is disposed in a central space portion, and is installed in a horizontally suspended state above the pier 1. The balance support balance 8 is attached to the pier 1 by constructing and supporting the pipe support 22 between the four corners of the balance 8 and the four outer peripheral surfaces of the pier 1 facing each corner. On the other hand, it is installed in a state where it cannot swing.

  Further, the balance-holding balance 8 is configured such that the distance between the diagonals thereof is set to the same distance as the diameter width of the surrounding wall 20 of the temporary cut-off structure 3, and the four corners of the balance-holding balance 8 are arranged. The descending ropes 9 are provided at the portions, and the descending ropes 9 at the four corners are connected to four locations at equal intervals in the circumferential direction of the temporary cutoff structure 3.

  Each of the four descending ropes 9 can be driven up and down by an elevating device (not shown) such as a chain block, and the temporary cutoff structure 3 is attached to the balance holding balance 8 by the control of the elevating device. At this time, the balance holding balance 8 connected via the descending rope 9 is fixed in a non-oscillating horizontal state, so that the provisional cutoff structure 3 is provided. Is maintained in a substantially equilibrium state without tilting and can be lowered stably.

  Next, the temporary closing structure 3 is slightly raised by an elevating device, and a water stop means 6 to be described later is installed at the bottom of the temporary closing structure 3, and then a lowering guide 5 is attached to the bridge pier 1 and the temporary closing structure 3. Install (see FIG. 2).

  Specifically, the lowering guide 5 is provided at least on the lower rail 11 having a length in the vertical direction installed on at least the opposite portion of the outer peripheral surface of the pier 1 and at least the opposite portion in the temporary fastening structure 3. The sliding support arm 12 includes a ball bearing 13 serving as a sliding member 13 that protrudes inwardly toward the pier 1 and is fitted to the lowering rail 11 at the protruding tip and can slide.

  The descent rail 11 is composed of a metal long material (channel material) having a cross-sectional groove shape (U-shape), and is fixed to the pier 1 with the bottom of the groove being along the outer peripheral surface of the pier 1. .

  In addition, the descent rail 11 is provided on the outer peripheral surface of the pier 1 at four positions spaced at equal intervals in the circumferential direction (angles 0, 90, 180, and 270 degrees with respect to the center of the pier 1 in plan view). The outer peripheral surface of the position is fixed (see FIG. 7).

  On the other hand, although not shown in detail, the sliding support arm 12 is made of a long metal material having an H-shaped cross section, and is arranged on the inner peripheral surface of the surrounding wall 20 of the temporary cutoff structure 3 in the circumferential direction thereof. At four positions spaced apart (inner peripheral surfaces at positions of 0 degrees, 90 degrees, 180 degrees, and 270 degrees with respect to the plan view center of the temporary closing structure 3) so as to project horizontally toward the center. Then, the ball bearings 13 at the tips of the four sliding support arms 12 are slidably fitted to the four descending rails 11 fixed to the pier 1 before the sliding support arm 12 is constructed. (See FIG. 7). Reference numeral 23 in the figure denotes a reinforcing frame that reinforces the horizontal projecting state of the sliding support arm 12 and contributes to improving the shape retention strength of the temporary fastening structure 3.

  The sliding support arm 12 with the ball bearing 13 is provided in two stages in the upper and lower stages within the temporary cutoff structure 3.

  Therefore, the provisional cutoff structure 3 can be smoothly moved down with respect to the pier 1 by sliding a total of eight ball bearings 13 on the four (four places) lowering rails 11. .

  Next, the working bottom portion 10 of the suspension scaffold 2 is removed, the temporary closing structure 3 is lowered from the balance holding balance 8 via the descending rope 9 by the lifting device, and the bridge pier is interposed via the lowering guide 5. 1 is lowered into the water under the bridge while maintaining the substantially closed state, and then from the upper edge of the surrounding wall 20 of the temporarily closed structure 3. By placing an anti-lifting bracket 24 on the upper side and fixing it to the pier 1, the anti-lifting bracket 24 comes into contact with the upper edge (the top end frame 36 described later) of the surrounding wall 20 of the temporary closing structure 3, The temporary cutoff structure 3 which is going to rise by buoyancy is stopped in water. Reference numeral 25 in the figure denotes the connection strength between the bottom plate member 14 and the surrounding wall 20 by being fixed in a plurality of places between the upper surface of the bottom plate member 14 of the temporary cutoff structure 3 and the inner surface of the surrounding wall 20. This is a reinforcing member that prevents the bottom plate portion 14 that receives buoyancy from floating about the surrounding wall 20.

  The drawing shows a case where the temporary closing structure 3 is fixed to a position in the middle of the pier 1 without reaching the foundation (footing) of the pier 1.

  Next, the water stop means 6 stops the gap between the through hole 4 at the bottom of the temporary cutoff structure 3 and the outer periphery of the pier 1.

  Specifically, the water stop means 6 of the present embodiment includes a water stop sheet 16 disposed between the through hole 4 at the bottom of the temporary closing structure 3 and the pier 1, and the water stop sheet 16. And a fastening line 17 which is provided in a wound state on the outside of the pier 1 so that the waterproof sheet 16 is brought into close contact with the outer peripheral surface of the pier 1 and the moving part 18 of the fastening line 17 is the temporary closing structure. 3 is configured so that the pulling portion 18 of the fastening line 17 can be pulled at a position above the water surface 19 below the bridge.

  More specifically, the water-stop sheet 16 is formed in a ring shape corresponding to the shape of the bottom plate material 14, and is provided so as to cover the entire bottom surface of the bottom plate material 14 from below (FIG. 2 to FIG. 2). 5 and FIGS. 8 to 10).

  Further, the outer end portion of the waterproof sheet 16 is folded upward and bonded to the outer peripheral edge of the bottom plate member 14, and the inner end portion of the waterproof sheet 16 is folded upward and the through hole portion 4 is arranged from the hole edge to the upper surface side of the bottom plate member 14 and is free.

  Further, on the outer surface near the inner end portion folded back above the water-stop sheet 16, a metal wire 17 serving as the fastening line 17 is wound around substantially the entire circumference near the inner end portion. And the guide rollers are arranged separately at two adjacent recesses 35 provided on the bottom plate member 14 after both ends of the fastening line 17 intersect at predetermined positions. 27, and the direction is changed by the guide roller 27 to guide it upward (see FIG. 8).

  Further, both ends (upper end portions) of the fastening rope 17 are formed in a ring shape, and the ring-shaped end portions are configured as the pulling portions 18, and the respective pulling portions 18 are installed at the upper ends of the enclosure wall 20. It is connected to a lever block (registered trademark) as the pulling device 28.

  In addition, the installation structure of the pulling device 28 on the upper end of the enclosure wall 20 is such that the hook portion of the pulling device 28 is provided in the upper groove portion of the metal top frame 36 having an H-shaped cross section that is fitted on the upper end of the enclosure wall 20. Is installed by hooking.

  Therefore, by operating the pulling device 28, the pulling portions 18 at both ends of the fastening cable 17 can be pulled, and thereby the inner end portion of the water stop sheet 16 is squeezed to be brought into close contact with the outer peripheral surface of the pier 1 and the water stop effect. It is comprised so that can be obtained. Further, since the pulling device 28 is provided at the upper end of the enclosure wall 20, the worker performs the water stop operation in the temporary cutoff structure 3 in which the water 7 has entered at the time of the water stop operation. There is no need, and this water stop operation can be easily performed on the water.

  Further, as shown in FIG. 10, the metal wire 17 as the fastening cable 17 is covered with a cover member 29 made of a material having an elastic outer surface (for example, rubber (natural rubber or synthetic rubber)). When the fastening cable 17 is fastened, the cover member 29 is adapted to be in close contact with the outer peripheral surface of the bridge pier 1 via the water-stop sheet 16 and exhibits a high water-stop effect.

  In addition, an adhesive sheet 30 made of an elastic material (for example, rubber (natural rubber or synthetic rubber)) is attached to the inner side surface near the inner end of the water stop sheet 16, and the adhesive sheet 30 The fastening cable 17 is tightened so as to be brought into close contact with the outer peripheral surface of the pier 1 and exhibit a high water stop effect (see FIG. 10).

  Further, the water stop means 6 of the present embodiment has a metal wire 31 as a sheet slip fastening cable 31 at a position below the fastening cable 17 on the outer surface near the inner edge of the water stop sheet 16, Similar to the fastening cable 17, it is attached in a wound state over substantially the entire circumference near the inner end.

  Specifically, both ends of the seat slip fastening cord 31 intersect on the opposite side of the fastening cord 17 and then opposite to the recess 35 where the fastening cord 17 is disposed. Separately disposed in two adjacent recesses 35 located on the side and passed through the guide roller 27, the direction is changed by the guide roller 27 and the guide roller 27 is guided upward (see FIG. 9).

  Further, both ends (upper end portions) of the seat slip fastening cord 31 are formed in a ring shape, and the ring-like end portion is configured as a pulling portion 37, and each pulling portion 37 is connected to the fastening rope 17. Similarly, it is connected to a pulling device 28 installed at the upper end of the surrounding wall 20.

  Therefore, by operating the pulling device 28, the pulling portions 37 at both ends of the sheet slip fastening rope 31 can be dragged, whereby the inner end of the water stop sheet 16 is squeezed and crimped to the outer peripheral surface of the pier 1. Thus, the water-stop sheet 16 is configured to be positioned.

  The sheet slip fastening cable 31 tightens the fastening cable 17 and stops water, and then drains the water 7 entering the temporary fastening structure 3 so that the fastening cable 17 is temporarily closed. It is provided to prevent the buoyancy of water existing below the structure 3 from moving up.

  That is, according to the applicant's test construction experiment, when the fastening line 17 is tightened and the water 7 is drained after the fastening line 17 is drained, the fastening line 17 together with the water-stopping sheet 16 has a water buoyancy. However, as shown in this embodiment, the seat slip fastening cable 31 is provided, the fastening rope 17 is fastened to stop the water, and then the seat slip fastening rope 31 is secured. It is confirmed that the movement of the fastening line 17 is prevented when the water stop sheet 16 is positioned by moving the water and the water 7 in the temporary cutoff structure 3 is drained.

  In addition, since the pulling device 28 for moving the seat slip fastening cord 31 is provided at the upper end of the enclosure wall 20, the water stop by the seat slip fastening cord 31 pulling following the water stop work is performed. The seat 16 is positioned (non-slip), but at this point in time, the operator does not need to perform this pulling operation in the temporary cut-off structure 3 in which the water 7 has entered. It can be done easily.

  Further, the water stop means 6 of the present embodiment uses a ring water stop tube 32 made of a material having elasticity (for example, rubber (natural rubber or synthetic rubber)) as secondary water stop.

  The water stop tube 32 is disposed on the outer side near the inner end of the water stop sheet 16 and above the fastening line 17. The water stop tube (primary stop) is caused by the pulling of the fastening line 17. After the water 7 that has entered the temporary cutoff structure 3 is drained, the water stop tube 32 is filled with air, and the water stop tube 32 is expanded to rise above the fastening line 17. The water stop sheet 16 at the position is also brought into close contact with the outer peripheral surface of the pier 1 to double stop the water.

  More specifically, the inner frame 26 constituting the bottom plate member 14 of the temporary fastening structure 3 has an E-shaped cross section, and the fastening line 17 is accommodated in the lower step portion of the inner frame 26. The water stop tube 32 is accommodated in the upper stage, and the water stop means 6 is installed on the bottom plate member 14.

  Next, after the water stoppage is completed, the water 7 entering the temporary closing structure 3 is drained by a pump or the like, so that the temporary closing structure 3 is used as a work dry area.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Pier 2 Suspended scaffold 3 Temporary cut-off structure 4 Through-hole part 5 Descent guide 6 Water stop means 7 Water 8 Balance holding balance 9 Falling rope
10 Working bottom
11 Descent rail
12 Gliding support arm
13 Sliding member
14 Bottom plate material
15 Split wall material
16 Water stop sheet
17 Fastening cable
18 Moving part
19 Water surface

Claims (5)

A suspension scaffold is installed in a non-submerged area above the pier. This suspension scaffold has a working bottom, and the suspension scaffold with the working bottom is provided with a through-hole that penetrates the pier at the bottom. A temporary closing structure that is installed so as to surround the outer periphery of the bridge pier is constructed, and a descent guide is installed on the pier and the temporary closing structure, and this descent guide is a descent rail that has a length in the vertical direction. Is installed on the outer periphery of the pier, and the temporary cutoff structure is configured to be able to move down along the lowering rail.After removing the working bottom of the suspension scaffold, it is connected to the pier via the lowering guide. On the other hand, the temporary closing structure is lowered into the water under the bridge, and the gap between the through hole at the bottom of the temporary closing structure and the outer periphery of the pier is stopped by water stopping means. Drain the water that has entered the body and temporarily close it. Installation method of the temporary deadline structure used in piers repair and reinforcement work, which comprises a forming body and work for dry area.   After constructing the temporary closing structure, an equilibrium holding balance is installed above the pier, and the descending ropes provided at several locations of the balance holding balance are connected to the temporary closing structure, and the pier and the temporary closing structure are connected. A descent guide is installed on the structure, the temporary cut-off structure is lowered from the balance holding balance via the descent rope, and the temporary cut-off structure is lowered with respect to the pier via the descent guide. The method for installing a temporary closing structure for use in pier repair / reinforcement work according to claim 1, wherein the temporary closing structure is lowered into the water under the bridge while maintaining the substantially closed state. The descent guide includes a descent rail that is installed at least on a facing portion of the outer periphery of the pier, and a descent rail that protrudes inwardly toward the pier at least on a facing portion in the temporary cut-off structure. The installation method of the temporary closing structure used for bridge pier repair and reinforcement construction of any one of Claims 1 and 2 , comprising a sliding support arm having a sliding member that can be fitted and slid . The temporary closing structure has a bottomed cylindrical shape in which a plurality of divided wall members are combined and connected in the circumferential direction and the height direction of the bridge pier at the outer peripheral edge of the bottom plate member provided with the through hole at the center. The temporary construction structure installation method used for the pier repair / reinforcement work according to any one of claims 1 to 3 , wherein the temporary cut-off structure is used. The water stop means is provided by a water stop sheet disposed between the through hole at the bottom of the temporary shut-off structure and the bridge pier, and wound around the water stop sheet so as to be stopped. A fastening line for closely adhering the water sheet to the outer peripheral surface of the pier, and a moving part of the fastening line is provided on the upper part of the temporary fastening structure. The temporary construction structure installation method for use in bridge pier repair / reinforcement work according to any one of claims 1 to 4 , wherein the construction method is configured so as to perform a pulling operation at a position above the water surface.

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