JP2018059297A - Water cut-off method for cofferdam structure used in bridge pier repair/reinforcement work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cut-off method for a cofferdam structure used in bridge pier repair/reinforcement work that readily realizes a complete water cut-off state that prevents water infiltration into the cofferdam structure.SOLUTION: A cofferdam structure 2 is constructed to surround an outer periphery of a bridge pier 1, the cofferdam structure having a through-hole part 3, through which the bridge pier 1 penetrates and is disposed, formed at a bottom part at a non-submerged location in an upper part of the bridge pier 1. The cofferdam structure 2 is submerged underwater below the bridge and a gap 4 between the through-hole part 3 and the bridge pier 1 is closed with concrete leakage prevention means 5. Then, concrete 6 is filled in the gap 4, and the gap 4 is sealed and water is cut-off as the concrete 6 hardens.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water stoppage construction method for a temporary closing structure used for repairing / reinforcing 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

  In general, the temporary closing structure is water-stopped by disposing a water-stopping structure made of an elastic material such as rubber between the bridge pier at the time of construction so that water does not enter the temporary closing structure. However, in such a water stop structure, especially when a temporary closing structure is installed at a deep water depth, the water stop structure is deformed by the influence of water pressure and water leaks (submerged into the temporary closing structure). There is a concern.

  The present invention is intended to dispel such concerns, and a water-stop method for a temporary closing structure used for bridge pier repair and reinforcement work that can easily realize a complete water-stop state in which water does not enter the temporary closing structure. Is to provide.

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

  At a non-submerged location above the pier 1, a through-hole portion 3 that is provided through the pier 1 is provided at the bottom, and a temporary cutoff structure 2 that is installed so as to surround the outer periphery of the pier 1 is constructed. The body 2 is lowered into the water under the bridge, the gap 4 between the through hole 3 and the pier 1 is closed with concrete leakage means 5, and then the gap 6 is filled with concrete 6. In this case, the gap portion 4 is hermetically sealed to cure the water and the water is stopped for the pier repair / reinforcement construction.

  2. The pier repairing / reinforcing work according to claim 1, wherein a reinforcing bar 7 is disposed above the gap portion 4, and the reinforcing bar 7 is embedded in the concrete 6 filling the gap portion 4. The present invention relates to a water stoppage construction method for a temporary cutoff structure.

  An anchor bar 8 is attached to the outer peripheral surface of the pier 1 near the gap 4, and the anchor bar 8 is embedded in the concrete 6 filling the gap 4. This relates to a water stoppage method for a temporary closing structure used in the pier repair and reinforcement work described in any one of the items.

  The concrete leaking means 5 has an elastic leaking tube 9 wound around the pier 1 so as to surround the pier 1 and is expanded by injection of fluid. The said gap part 4 is comprised so that it may be block | closed, It concerns on the water stop construction method of the temporary closing structure used for the pier repair and reinforcement construction of any one of Claims 1-3 characterized by the above-mentioned It is.

  Further, the concrete leakage means 5 is configured such that a mold plate 10 is installed in the gap 4 and the gap 4 is closed by the mold plate 10. It concerns the water stop construction method of the temporary closing structure used for the pier repair and reinforcement work of any one of claim | item 1-3.

  Since the present invention is configured as described above, the concrete can be easily and efficiently filled into the gap by the concrete leakage means, and the gap between the through hole at the bottom of the temporary fastening structure and the pier can be filled with high-strength concrete. Water can be completely stopped, so a good working space (dry area) can be formed with no fear of inundation in the temporary shut-off structure, and pier repair and reinforcement work at deep water can be handled. This is a water-stop method for temporarily closing structures used for pier repair / reinforcement work that is extremely practical.

  Further, in the invention according to claim 2, the concrete layer that is filled and hardened in the gap between the through-hole portion and the pier at the bottom of the temporary cutoff structure becomes stronger, so it is highly resistant to water pressure. This is a water-stop method for temporarily closing structures used for pier repair / reinforcement work that is more practical and can exhibit extremely high water-stop performance.

  Further, in the invention described in claim 3, the pier repair with more practicality capable of firmly positioning the temporary closing structure with respect to the pier and exhibiting the high lifting prevention effect of the temporary closing structure against the buoyancy of water.・ This is a water-stop method for temporarily closing structures used for reinforcement work.

  Further, in the inventions according to claims 4 and 5, the concrete sealing means is constructed with a simple structure and can be easily designed and realized. It becomes the water method.

It is a schematic explanatory drawing which shows the installation completion state (water stop completion state) of the temporary closing structure to the pier of Example 1. It is an explanatory top view which shows the relationship between the pier of Example 1, and the baseplate material of a temporary cutoff structure. It is a structure explanation side sectional view showing the baseplate material of Example 1. FIG. 3 is an explanatory plan view showing a lowering guide according to the first embodiment. It is an expansion front sectional view of the important section showing the state where the reinforcing bar was arranged on the bottom board material of Example 1, and the anchor bar was attached to the pier. FIG. 6 is an enlarged front cross-sectional view of a main part showing a state (a water stop completion state) in which a gap portion is closed with a concrete sealing means and concrete is filled into the gap portion and hardened, following FIG. 5. It is a schematic explanatory drawing which shows the installation completion state (water stop completion state) of the temporary closing structure to the pier of Example 2. It is explanatory plan view which shows the relationship between the bridge pier of Example 2, and the baseplate material of a temporary cutoff structure. It is structure explanatory side sectional drawing which shows the baseplate material of Example 2. FIG. It is an expansion front sectional view of the principal part which shows the state which attached the anchor reinforcement to the pier of Example 2, and closed the gap | interval part with the concrete leaking means. FIG. 11 is an enlarged front cross-sectional view of a main part showing a state where concrete is filled and hardened in a gap portion (water-stop completed state) following FIG. 10.

  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.

  At a non-submerged location above the pier 1, a through-hole portion 3 that penetrates the pier 1 is provided at the bottom, and the temporary fastening structure 2 that is installed so as to surround the outer periphery of the pier 1 is constructed.

  Next, the constructed temporary cutoff structure 2 is lowered into the water under the bridge, and the gap 4 between the through hole 3 and the pier 1 is closed by the concrete leakage means 5, and then the concrete 6 Fill.

  That is, the filling of the concrete 6 is performed in a state where the concrete 6 is prevented from leaking from the gap 4 by the concrete leakage means 5, so this operation is performed easily and without waste in the amount of use of the concrete 6. .

  When this filled concrete 6 is hardened, the gap 4 is sealed with the hardened concrete 6 so that the gap 4 is completely stopped, and the pier 1 is repaired without worrying about inundation in the temporary closing structure 2. It can be a work space (dry area) for reinforcement work.

  Further, according to the water stop method of the present invention, unlike the water stop method using a conventional water stop structure made of an elastic body, the high-strength concrete 6 exhibits high resistance to water pressure. It is possible to cope well with the repair and reinforcement work of the pier 1 at a deep location.

  A first embodiment of the present invention will be described with reference to FIGS.

  The present embodiment relates to an installation method of the temporary closing structure 2 used for repair / reinforcement work of the pier 1 which is performed when the pier 1 of the bridge over the river or the sea is damaged. 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 or the like of the temporary fastening structure 2 is appropriately set according to the shape of the pier 1. The design can be changed.

  The installation procedure will be described below.

  First, an unillustrated floating pier is installed on the water surface around the pier 1, and a working scaffold (not shown) is installed above the water surface of the pier 1 (non-submerged portion).

  Next, by using this work scaffold, a temporary fastening structure 2 is constructed in which a through-hole portion 3 through which the pier 1 penetrates is provided at the bottom and is installed so as to surround the outer periphery of the pier 1.

  Specifically, the temporary cutoff structure 2 has a bottomed cylinder in which a cylindrical enclosure wall 12 is connected in an upright state to an outer peripheral edge of a bottom plate member 11 provided with the through-hole portion 3 in the center. Configured.

  More specifically, first, the cylindrical enclosure wall 12 having a required height is formed by connecting a plurality of curved plate liner plates 13 employed as the dividing wall member 13 in the circumferential direction and the height direction of the pier 1. To do.

  Next, descending ropes 14 are installed at several locations (for example, four locations) above the pier 1, the descending ropes 14 are connected to the enclosure wall 12, and the enclosure wall 12 is suspended from the pier 1 (see FIG. 1). ).

  Each of the descending ropes 14 is configured to be driven up and down by an elevating device (not shown) such as a chain block, and can move down the enclosure wall 12 (temporary cut-off structure 2) under the control of the elevating device. Is provided.

  Next, the bottom plate member 11 is formed in the lower part of the surrounding wall 12 to construct the temporary cut-off structure 2.

  The bottom plate material 11 includes a bottom frame 15 and a floor plate 19 attached to the bottom frame 15.

  More specifically, as shown in FIG. 2, the bottom frame 15 has a ring-shaped metal inner frame 16 having a diameter larger than the outer diameter of the foundation (footing) 35 of the pier 1 and a diameter larger than the inner frame 16. A ring-shaped metal outer frame 17 having an outer diameter dimension equivalent to the outer diameter dimension of the surrounding wall 12 is concentrically arranged, and the inner frame 16 and the outer frame 17 are respectively arranged. They are connected by a plurality of connecting frames 18 arranged radially from the center.

  The floor plate 19 is configured as a circular arc plate in plan view that substantially matches the shape of the arc-shaped gap surrounded by the inner frame 16, the outer frame 17, and the connecting frame 18, and as shown in FIG. A laminated board 21 having a thickness in which a decorative board 21 using a plywood or a metal plate is laminated on the upper and lower surfaces of a polystyrene foam (EPS) substrate 20 is configured.

  The floor plate 19 is disposed in all the gaps surrounded by the inner frame 16, the outer frame 17, and the connecting frame 18 of the bottom frame 15, and the bottom plate material 11 having a donut disk shape in plan view is configured. Has been.

  The floor plate 19 is arranged on the bottom frame 15 in such a manner that the connecting frame 18 is made of a steel material having a cross-sectionally H-shaped cross section, and both end portions of the floor plate 19 are fitted into the groove portions on both sides of the connecting frame 18. The fitting end portions of the floor plate 19 are pressed and fixed by tightening the tightening bolts 22 provided on the upper flange portion of the connecting frame 18 (see FIG. 3). Reference numeral 23 in the figure is an interposition plate interposed between the upper surface (upper decorative plate 21) of the floor plate 19 and the bolt tip of the fastening bolt 22.

  By connecting the lower end portion of the surrounding wall 12 to the outer peripheral edge portion of the bottom plate member 11 having such a structure, the bottom plate member 11 becomes a bottom portion, and the inner side of the inner frame 16 functions as the through hole portion 3. The cylindrical temporary cutoff structure 2 is constructed.

  The bottom plate member 11 is connected to the surrounding wall 12 (divided wall member 13) in such a manner that the outer frame 17 has an H-shaped cross section, and the lower part of the surrounding wall 12 is divided into the upper groove portion of the outer frame 17. The wall material 13 is configured to be fitted and connected (see FIGS. 5 and 6).

  Next, as shown in FIGS. 1 and 4, the lowering guide 24 is installed on the pier 1 and the temporary closing structure 2.

  Specifically, the lowering guide 24 is provided on at least the opposing part in the temporary closing structure 2 and the lowering rail 25 having a length in the vertical direction installed at least on the opposing part of the outer peripheral surface of the pier 1. The sliding support arm 26 includes a ball bearing 27 as a sliding member 27 that protrudes inwardly toward the pier 1 and is fitted to the lowering rail 25 at the protruding tip and can slide.

  More specifically, the descent rail 25 is formed of a metal long material (channel material) having a cross-sectional groove shape (C shape), and the bottom of the groove extends along the outer peripheral surface of the pier 1 to the pier 1. It is fixed vertically.

  In addition, the descent rail 25 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). Position) (see FIG. 4).

  On the other hand, although not shown in detail, the sliding support arm 26 is made of a long metal member having an H-shaped cross section, and is arranged on the inner peripheral surface of the surrounding wall 12 of the temporary cut-off structure 2 in the circumferential direction. It is constructed so as to project horizontally toward the center at four intervals (positions at angles of 0 degrees, 90 degrees, 180 degrees, and 270 degrees with respect to the plan view center of the temporary closing structure 2). The ball bearings 27 at the tips of the four sliding support arms 26 are slidably fitted to the four lowering rails 25 fixed to the pier 1 (see FIG. 4). Reference numeral 30 in the drawing is a reinforcing frame that reinforces the horizontal projecting state of the sliding support arm 26 and contributes to improving the shape retaining strength of the temporary fastening structure 2.

  The sliding support arm 26 includes an inner peripheral surface of a ring-shaped relay frame 28 disposed in the middle of the surrounding wall 12 of the temporary cut-off structure 2, and a ring-shaped top end disposed at an upper end portion. It protrudes from the inner peripheral surface of the frame 29 and is provided in three stages, upper and lower, within the temporary cutoff structure 2.

  Therefore, a total of twelve ball bearings 27 slide on the four (four places) descent rails 25, so that the provisional cut-off structure 2 can move down and move smoothly with respect to the pier 1 while maintaining the posture. It is configured as follows.

  Next, the working scaffold is removed, and the temporary closing structure 2 is lowered to the pier 1 with respect to the pier 1 through the lowering guide 24 by the lifting device, and then the upper edge of the surrounding wall 12 of the temporary closing structure 2 By placing an anti-floating bracket 31 above the section and fixing it to the pier 1, the anti-floating bracket 31 comes into contact with the top end frame 29 provided on the upper edge of the enclosure wall 12 of the temporary cut-off structure 2. The temporary cut-off structure 2 that is going to rise by buoyancy is stopped in water.

  In the drawing, the temporary closing structure 2 is installed on the pier 1 so that the bottom of the temporary cutting structure 2 reaches the foundation 35 of the pier 1, and the through hole 3 of the temporary closing structure 2 and the foundation 35 of the pier 1 The case where the gap | interval part 4 arises between is shown.

  Next, the gap 4 between the through hole 3 of the temporary closing structure 2 and the foundation 35 of the pier 1 is stopped.

  The water stop construction method of the temporary cutoff structure which is the principal part of a present Example is demonstrated.

  First, the gap 4 is closed with concrete leakage means 5.

  The concrete sealing means 5 of this embodiment is provided with a sealing sheet 32 on the temporary closing structure 2 so as to cover the bottom thereof, and the sealing sheet 32 is connected to the through-hole portion 3. A central hole portion 33 is provided, and a hole edge sheet portion 34 folded back above the central hole portion 33 surrounds the pier 1 in the gap portion 4 between the through hole portion 3 and the pier 1. A sealing tube 9 made of an elastic material (for example, rubber (natural rubber or synthetic rubber)) is wound around the outer edge sheet portion 34 of the sealing sheet 32, After the temporary closing structure 2 is lowered into the water under the bridge, a fluid is injected into the leakage tube 9, and the leakage tube 9 that expands by the fluid injection causes the hole edge sheet portion 34 to be connected to the outer peripheral surface of the pier 1. (The gap 4 is blocked by the sealing tube 9 and the sealing sheet 32). Is it), and prevents the concrete 6 to be described later from leaking from the gap portion 4 downward provisional deadlines structure 2 bottom (see FIGS. 5 and 6).

  More specifically, as shown in FIGS. 5 and 6, the sealing sheet 32 is formed in a ring shape corresponding to the shape of the bottom plate material 11 so as to cover the entire bottom surface of the bottom plate material 11 from below. Is provided.

  Further, the outer peripheral edge portion of the sealing sheet 32 is folded back upward and bonded to the outer peripheral edge portion of the bottom plate member 11, and the hole of the central hole portion 33 which is the inner peripheral portion of the sealing sheet 32 The edge sheet portion 34 is folded back so as to rise upward and is disposed from the hole edge of the through-hole portion 3 to the upper surface side of the bottom plate member 11.

  Further, the inner frame 16 constituting the bottom plate member 11 of the temporary cut-off structure 2 has a U-shaped cross section, and the leakage tube 9 is accommodated in the inner groove portion of the inner frame 16. The leakage tube 9 is wound around the outer edge sheet portion 34.

  In addition, you may employ | adopt the concrete sealing means 5 by which the clearance gap part 4 is block | closed by the sealing tube 9, without providing the sealing sheet 32. FIG.

  Next, rebars 7 previously assembled on the water are lowered above the gap 4 and the bottom plate member 11, and anchor bars 8 are attached to the outer peripheral surface of the pier 1 above the gap 4. The reinforcing bars 7 and the anchor bars 8 may be installed before the gap 4 is closed by the concrete leakage means 5. Moreover, the design of the form of the reinforcing bars 7 and the number of anchor bars 8 can be appropriately changed according to the situation at the site.

  Next, the concrete 6 is filled into the gap 4 from above the concrete leakage means 5 blocking the gap 4 in the water that has entered the temporary cutoff structure 2. The anchor bars 8 are buried (buried) and the concrete 6 is hardened.

  That is, the gap 4 is sealed and water is stopped by hardening of the concrete 6, and the strength improvement effect of the hardened concrete 6 layer by the reinforcing bars 7 and the firm positioning of the temporary closing structure 2 to the pier 1 by the anchor bars 8. It is comprised so that an effect may be exhibited.

  Further, in this embodiment, the concrete 6 is filled in the entire range of the upper portion of the bottom plate material 11 in addition to the gap portion 4, and further, the worker can easily work on the hardened concrete 6 layers. The upper surface of the concrete 6 is formed into a flat surface (see FIGS. 1 and 6).

  After the water-stopping of the temporary cutoff structure 2 by the hardening of the concrete 6 is completed, the water entering the temporary cutoff structure 2 is drained by a pump or the like to make the temporary cutoff structure 2 a work dry area, and the construction is completed. Become.

  After the repair and reinforcement work for the pier 1 is completed, the six layers of concrete are rolled up, and the temporary cut-off structure 2 is raised and removed.

  A second embodiment of the present invention will be described with reference to FIGS.

  The present embodiment is a case where the configuration of the bottom plate 11 of the temporary closing structure 2 and the configuration of the concrete sealing means 5 are different from those of the first embodiment.

  First, the bottom plate material 11 of the present embodiment will be described. As in the first embodiment, the bottom plate member 11 is composed of a bottom frame 15 and a floor plate 19 attached to the bottom frame 15. The configuration is different from that of the first embodiment.

  Specifically, the bottom frame 15 of the present embodiment includes an outer frame 17 equivalent to that of the first embodiment, and a plurality of frames disposed radially inside the outer frame 17 from the center of the outer frame 17. The floor plate 19 of the present embodiment is made of a metal plate material in the shape of a circular arc in plan view that is laid between the plurality of the support frames 17.

  Then, the floor plate 19 is installed between the plurality of support frames 36 of the bottom frame 15 so as to have a donut disk shape in a plan view, and the circular hole portion inside the floor plate 19 is the through hole portion. The bottom plate material 11 functioning as 3 is configured (see FIG. 8).

  In addition, the installation structure of the floor plate 19 on the support frame 36 is such that the end portions of the floor plate 19 adjacent to the upper flange portion of the support frame 36 made of steel material having a cross-sectionally rolled H shape are adjacent to each other. A pressing frame 39 employing an angle material is placed on the floor plate 19 so as to be placed between the support frames 36 while being placed in abutment state. The upper flange portion of the support frame 36 and the floor plate A bolt 37 is provided so as to penetrate the end of 19 and the pressing frame 39, and the floor plate 19 is installed and fixed to the support frame 36 by tightening a nut 38 screwed to the bolt 37 ( (See FIG. 9). Reference numeral 40 in the drawing is a connection member that is fixed in an erected state on the upper surface between the butted end portions of adjacent floor plates 19 and connects the butted end portions of the floor plates 19 to each other. A configuration in which the butted ends of the floorboard 19 are welded to each other without using the connecting member 40 may be employed.

  In the case of the present embodiment in which the bottom plate member 11 of the temporary closing structure 2 is configured in this manner, the temporary closing structure 2 after construction is lowered into the water with respect to the pier 1 via the lowering guide 24 by the lifting device. Then, the anti-floating bracket 31 is arranged above the upper edge of the enclosure wall 12 of the temporary cutoff structure 2 and fixed to the bridge pier 1, and in addition to the bottom plate material 11 of the temporary cutoff structure 2. A floating prevention underwater bracket 41 having a substantially triangular frame shape is attached to the outer peripheral surface of the foundation 35 of the pier 1, and the bottom plate portion 11 is connected and fixed to the upper frame portion of the floating prevention underwater bracket 41.

  That is, in this embodiment, the anti-floating bracket 31 is in contact with the top end frame 29 provided on the upper edge of the enclosure wall 12 of the temporary cut-off structure 2, and the bottom plate 11 is attached to the anti-floating underwater bracket 41. By being fixed, the temporary cutoff structure 2 which is going to rise by buoyancy is stopped in water (see FIG. 7).

  The anti-floating underwater bracket 41 is constructed by assembling steel materials having a T-shaped section or an L-shaped section into a substantially triangular frame shape, and uses anchor bolts (not shown) attached to the foundation 35 of the pier 1. The base 35 is attached and fixed to the outer peripheral surface.

  Further, as shown in FIGS. 9 to 11, the connecting and fixing structure of the floating prevention underwater bracket 41 and the bottom plate member 11 is provided on the lower frame portion of the bottom plate member 11 on the upper frame portion of the floating prevention underwater bracket 41. The flange portion is mounted in a superposed manner, and this overlapped portion is configured to be clamped and fixed using a connecting fitting 42 having a tightening bolt 44 at both free ends of the U-shaped main body 43.

  In addition, it uses a structure that tightens and fixes with bolts and nuts that penetrate through the overlapping part between the upper frame part of the anti-floating underwater bracket 41 and the lower flange part of the support frame 36, without using the connecting bracket 42. You may do it.

  Further, the mounting work of the anti-floating underwater bracket 41 to the pier 1, the connecting and fixing work of the bottom plate 11 to the anti-floating underwater bracket 41, and the installation work to the gap 4 of the mold plate 10 to be described later are: Although the underwater work is performed by a diver under the temporary cutoff structure 2, the temporary cutoff structure 2 of the present embodiment is below the bottom plate material 11 so that it is not easily affected by the flow of water or waves at this time. A protective wall 45 is suspended.

  The guard wall 45 is formed in a cylindrical wall body having a required height (depth) by combining and connecting the divided wall members 13 in the same manner as the surrounding wall 12, and the guard wall 45 is formed in the lower groove portion of the outer frame 17. Since the lower divided wall member 13 is fitted and connected, a guard wall 45 is suspended downward from the bottom plate member 11 (see FIGS. 7, 10, and 11).

  In this embodiment, when the anti-floating underwater bracket 41 and the bottom plate material 11 are connected and fixed, the gap portion 4 between the through-hole portion 3 and the pier 1 is configured differently from the first embodiment. It is closed with concrete leakage means 5.

  Next, the concrete leakage means 5 of the present embodiment will be described in the case where a mold plate 10 is installed in the gap portion 4 so that the gap portion 4 is closed by the mold plate 10. .

  Specifically, the mold plate 10 is installed in the gap portion 4 so as to block the entire outer periphery of the gap portion 4 by being vertically installed between the inner end portions of the respective support frames 36. The outer mold plate 46 and the support frame 36 are installed between the lower ends of the support frames 36 so that the lower end of the gap 4 is closed by the inner end contacting the outer peripheral surface of the foundation 35 of the pier 1. And a lower mold plate 47 installed in the gap portion 4.

  Also, the outer frame plate 46 is installed in such a manner that the outer frame plate 46 is superposed on the flange portion provided at the inner end of the support frame 36, and the superposed portion of the outer mold plate 46 and the inner flange portion is overlapped. By tightening a mounting bolt 48 and a mounting nut 49 provided so as to penetrate, the outer frame plate 46 is attached to the inner end portion of the support frame 36 and installed in the gap portion 4 (FIGS. 10 and 10). 11).

  Further, the lower mold plate 47 is installed such that when the bottom plate member 11 is connected and fixed to the anti-floating underwater bracket 41, it is interposed between the upper frame portion of the anti-floating underwater bracket 41 and the lower end portion of the support frame 36. By sandwiching the outer portion of the lower mold plate 47, the lower mold plate 47 is attached to the support frame 36 and installed in the gap 4 (see FIGS. 9 to 11).

  In the present embodiment, the shape that also has the function of a reinforcing bar on the outer peripheral surface of the pier 1 above the gap 4 before or after the gap 4 is closed with the concrete leakage means 5. Then, the anchor bar 8 is attached, and then the concrete part 6 is filled with the concrete 6 from above the concrete leaking means 5 so that the anchor bar 8 is embedded. 4 is sealed and water is stopped.

  Moreover, in the case of a present Example, the concrete 6 is filled so that the bridge pier 1 side of the upper surface of the bottom plate material 11 (about 1/3 of the upper surface of the bottom plate material 11 in the inside / outside direction) may be filled in addition to the gap portion 4. The case is shown (refer FIG. 7, FIG. 11).

  Other configurations are the same as those of the first embodiment.

  The present invention is not limited to the first and second embodiments, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Temporary cutoff structure 3 Through-hole part 4 Gap part 5 Concrete leaking means 6 Concrete 7 Reinforcement 8 Anchor reinforcement 9 Leakage tube
10 Formwork

  The present invention relates to a water stoppage construction method for a temporary closing structure used for repairing / reinforcing 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

  In general, the temporary closing structure is water-stopped by disposing a water-stopping structure made of an elastic material such as rubber between the bridge pier at the time of construction so that water does not enter the temporary closing structure. However, in such a water stop structure, especially when a temporary closing structure is installed at a deep water depth, the water stop structure is deformed by the influence of water pressure and water leaks (submerged into the temporary closing structure). There is a concern.

  The present invention is intended to dispel such concerns, and a water-stop method for a temporary closing structure used for bridge pier repair and reinforcement work that can easily realize a complete water-stop state in which water does not enter the temporary closing structure. Is to provide.

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

At a non-submerged location above the pier 1, a through-hole portion 3 that is provided through the pier 1 is provided at the bottom, and a temporary cutoff structure 2 that is installed so as to surround the outer periphery of the pier 1 is constructed. lowering the body 2 in water Hashimoto, the gap 4 between the through-hole 3 and the pier 1, a leaktight tube 9 having elasticity as concrete leaktight means 5, so as to surround the pier 1 The gap tube 4 is closed by the sealing tube 9 that is wound and expanded by injection of fluid, and then anchor bars 8 are attached to the outer peripheral surface of the pier 1 above the gap portion 4 . Temporary cut-off structure used for pier repair / reinforcement work, characterized in that the concrete is filled with the anchor bars 8 embedded in the concrete 6 and the gap 6 is sealed and water-stopped by hardening of the concrete 6 Related to the still water construction method That.

In addition, a temporary fastening structure 2 is constructed at a non-submerged location above the pier 1 and provided with a through hole portion 3 that penetrates the pier 1 at the bottom and is installed so as to surround the outer periphery of the pier 1. The cutoff structure 2 is lowered into the water under the bridge, and a floating prevention underwater bracket 41 is disposed in the water below the temporary cutoff structure 2, and the floating prevention underwater bracket 41 is fixed to the pier 1. The bottom of the temporary cutoff structure 2 is fixed to the floating prevention underwater bracket 41, and a form plate 10 as a concrete leakage means 5 is provided between the floating prevention underwater bracket 41 and the bottom of the temporary cutoff structure 2. After sandwiching, the gap plate 4 between the through hole 3 and the bridge pier 1 is closed with the mold plate 10, and the gap 6 is filled with concrete 6. It is characterized by sealing part 4 and stopping water Those of the waterproofing method of tentative deadline structure used in that piers repair and reinforcement work.

3. The reinforcing bar 7 is disposed above the gap 4, and the reinforcing bar 7 is embedded in the concrete 6 filling the gap 4. This is related to the water stoppage method for temporary cut-off structures used for repairing and reinforcing piers.

Further, by attaching a Anchors 8 to the pier 1 outer peripheral surface in the vicinity of the gap portion 4, the Anchors 8, according to claim 2, characterized in that embedded in the concrete 6 to fill the gap 4 This relates to a water stoppage method for a temporary closing structure used in the pier repair and reinforcement work described in any one of the items.

  Since the present invention is configured as described above, the concrete can be easily and efficiently filled into the gap by the concrete leakage means, and the gap between the through hole at the bottom of the temporary fastening structure and the pier can be filled with high-strength concrete. Water can be completely stopped, so a good working space (dry area) can be formed with no fear of inundation in the temporary shut-off structure, and pier repair and reinforcement work at deep water can be handled. This is a water-stop method for temporarily closing structures used for pier repair / reinforcement work that is extremely practical.

According to the first aspect of the present invention, an elastic leakage tube is wound around the gap portion so as to surround the pier, and the gap portion is closed by the leakage tube that is expanded by liquid injection. Therefore, it is possible to realize the design easily with a simple structure of the concrete leakage prevention means, and an anchor bar is attached to the outer peripheral surface of the pier above the gap, and the anchor bar is filled by filling the gap with concrete. Because it is embedded in concrete, the temporary closing structure can be firmly positioned with respect to the pier, and it can be used for pier repair and reinforcement work that is more practical and capable of exhibiting a high lifting prevention effect against the buoyancy of water. This is a water-stop method for temporarily closing structures.

Further, in the invention described in claim 2, since the mold plate is installed in the gap portion and the gap portion is closed by the mold plate, the concrete leakage means has a simple configuration. This is a water-stop method for temporarily closing structures used for pier repair / reinforcement work that is more practical and can be easily realized.

In the invention according to claim 3 , since the concrete layer that is filled and hardened in the gap between the through hole at the bottom of the temporary closing structure and the bridge pier becomes stronger, it is highly resistant to water pressure. This is a water-stop method for temporarily closing structures used for pier repair / reinforcement work that is more practical and can exhibit extremely high water-stop performance.

Further, in the invention according to claim 4 , the pier repair with more practicality capable of firmly positioning the temporary closing structure with respect to the pier and exhibiting the high lifting prevention effect of the temporary closing structure against the buoyancy of water.・ This is a water-stop method for temporarily closing structures used for reinforcement work.

It is a schematic explanatory drawing which shows the installation completion state (water stop completion state) of the temporary closing structure to the pier of Example 1. It is an explanatory top view which shows the relationship between the pier of Example 1, and the baseplate material of a temporary cutoff structure. It is a structure explanation side sectional view showing the baseplate material of Example 1. FIG. 3 is an explanatory plan view showing a lowering guide according to the first embodiment. It is an expansion front sectional view of the important section showing the state where the reinforcing bar was arranged on the bottom board material of Example 1, and the anchor bar was attached to the pier. FIG. 6 is an enlarged front cross-sectional view of a main part showing a state (a water stop completion state) in which a gap portion is closed with a concrete sealing means and concrete is filled into the gap portion and hardened, following FIG. 5. It is a schematic explanatory drawing which shows the installation completion state (water stop completion state) of the temporary closing structure to the pier of Example 2. It is explanatory plan view which shows the relationship between the bridge pier of Example 2, and the baseplate material of a temporary cutoff structure. It is structure explanatory side sectional drawing which shows the baseplate material of Example 2. FIG. It is an expansion front sectional view of the principal part which shows the state which attached the anchor reinforcement to the pier of Example 2, and closed the gap | interval part with the concrete leaking means. FIG. 11 is an enlarged front cross-sectional view of a main part showing a state where concrete is filled and hardened in a gap portion (water-stop completed state) following FIG. 10.

  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.

  At a non-submerged location above the pier 1, a through-hole portion 3 that penetrates the pier 1 is provided at the bottom, and the temporary fastening structure 2 that is installed so as to surround the outer periphery of the pier 1 is constructed.

  Next, the constructed temporary cutoff structure 2 is lowered into the water under the bridge, and the gap 4 between the through hole 3 and the pier 1 is closed by the concrete leakage means 5, and then the concrete 6 Fill.

  That is, the filling of the concrete 6 is performed in a state where the concrete 6 is prevented from leaking from the gap 4 by the concrete leakage means 5, so this operation is performed easily and without waste in the amount of use of the concrete 6. .

  When this filled concrete 6 is hardened, the gap 4 is sealed with the hardened concrete 6 so that the gap 4 is completely stopped, and the pier 1 is repaired without worrying about inundation in the temporary closing structure 2. It can be a work space (dry area) for reinforcement work.

  Further, according to the water stop method of the present invention, unlike the water stop method using a conventional water stop structure made of an elastic body, the high-strength concrete 6 exhibits high resistance to water pressure. It is possible to cope well with the repair and reinforcement work of the pier 1 at a deep location.

  A first embodiment of the present invention will be described with reference to FIGS.

  The present embodiment relates to an installation method of the temporary closing structure 2 used for repair / reinforcement work of the pier 1 which is performed when the pier 1 of the bridge over the river or the sea is damaged. 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 or the like of the temporary fastening structure 2 is appropriately set according to the shape of the pier 1. The design can be changed.

  The installation procedure will be described below.

  First, an unillustrated floating pier is installed on the water surface around the pier 1, and a working scaffold (not shown) is installed above the water surface of the pier 1 (non-submerged portion).

  Next, by using this work scaffold, a temporary fastening structure 2 is constructed in which a through-hole portion 3 through which the pier 1 penetrates is provided at the bottom and is installed so as to surround the outer periphery of the pier 1.

  Specifically, the temporary cutoff structure 2 has a bottomed cylinder in which a cylindrical enclosure wall 12 is connected in an upright state to an outer peripheral edge of a bottom plate member 11 provided with the through-hole portion 3 in the center. Configured.

  More specifically, first, the cylindrical enclosure wall 12 having a required height is formed by connecting a plurality of curved plate liner plates 13 employed as the dividing wall member 13 in the circumferential direction and the height direction of the pier 1. To do.

  Next, descending ropes 14 are installed at several locations (for example, four locations) above the pier 1, the descending ropes 14 are connected to the enclosure wall 12, and the enclosure wall 12 is suspended from the pier 1 (see FIG. 1). ).

  Each of the descending ropes 14 is configured to be driven up and down by an elevating device (not shown) such as a chain block, and can move down the enclosure wall 12 (temporary cut-off structure 2) under the control of the elevating device. Is provided.

  Next, the bottom plate member 11 is formed in the lower part of the surrounding wall 12 to construct the temporary cut-off structure 2.

  The bottom plate material 11 includes a bottom frame 15 and a floor plate 19 attached to the bottom frame 15.

  More specifically, as shown in FIG. 2, the bottom frame 15 has a ring-shaped metal inner frame 16 having a diameter larger than the outer diameter of the foundation (footing) 35 of the pier 1 and a diameter larger than the inner frame 16. A ring-shaped metal outer frame 17 having an outer diameter dimension equivalent to the outer diameter dimension of the surrounding wall 12 is concentrically arranged, and the inner frame 16 and the outer frame 17 are respectively arranged. They are connected by a plurality of connecting frames 18 arranged radially from the center.

  The floor plate 19 is configured as a circular arc plate in plan view that substantially matches the shape of the arc-shaped gap surrounded by the inner frame 16, the outer frame 17, and the connecting frame 18, and as shown in FIG. A laminated board 21 having a thickness in which a decorative board 21 using a plywood or a metal plate is laminated on the upper and lower surfaces of a polystyrene foam (EPS) substrate 20 is configured.

  The floor plate 19 is disposed in all the gaps surrounded by the inner frame 16, the outer frame 17, and the connecting frame 18 of the bottom frame 15, and the bottom plate material 11 having a donut disk shape in plan view is configured. Has been.

  The floor plate 19 is arranged on the bottom frame 15 in such a manner that the connecting frame 18 is made of a steel material having a cross-sectionally H-shaped cross section, and both end portions of the floor plate 19 are fitted into the groove portions on both sides of the connecting frame 18. The fitting end portions of the floor plate 19 are pressed and fixed by tightening the tightening bolts 22 provided on the upper flange portion of the connecting frame 18 (see FIG. 3). Reference numeral 23 in the figure is an interposition plate interposed between the upper surface (upper decorative plate 21) of the floor plate 19 and the bolt tip of the fastening bolt 22.

  By connecting the lower end portion of the surrounding wall 12 to the outer peripheral edge portion of the bottom plate member 11 having such a structure, the bottom plate member 11 becomes a bottom portion, and the inner side of the inner frame 16 functions as the through hole portion 3. The cylindrical temporary cutoff structure 2 is constructed.

  The bottom plate member 11 is connected to the surrounding wall 12 (divided wall member 13) in such a manner that the outer frame 17 has an H-shaped cross section, and the lower part of the surrounding wall 12 is divided into the upper groove portion of the outer frame 17. The wall material 13 is configured to be fitted and connected (see FIGS. 5 and 6).

  Next, as shown in FIGS. 1 and 4, the lowering guide 24 is installed on the pier 1 and the temporary closing structure 2.

  Specifically, the lowering guide 24 is provided on at least the opposing part in the temporary closing structure 2 and the lowering rail 25 having a length in the vertical direction installed at least on the opposing part of the outer peripheral surface of the pier 1. The sliding support arm 26 includes a ball bearing 27 as a sliding member 27 that protrudes inwardly toward the pier 1 and is fitted to the lowering rail 25 at the protruding tip and can slide.

  More specifically, the descent rail 25 is formed of a metal long material (channel material) having a cross-sectional groove shape (C shape), and the bottom of the groove extends along the outer peripheral surface of the pier 1 to the pier 1. It is fixed vertically.

  In addition, the descent rail 25 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). Position) (see FIG. 4).

  On the other hand, although not shown in detail, the sliding support arm 26 is made of a long metal member having an H-shaped cross section, and is arranged on the inner peripheral surface of the surrounding wall 12 of the temporary cut-off structure 2 in the circumferential direction. It is constructed so as to project horizontally toward the center at four intervals (positions at angles of 0 degrees, 90 degrees, 180 degrees, and 270 degrees with respect to the plan view center of the temporary closing structure 2). The ball bearings 27 at the tips of the four sliding support arms 26 are slidably fitted to the four lowering rails 25 fixed to the pier 1 (see FIG. 4). Reference numeral 30 in the drawing is a reinforcing frame that reinforces the horizontal projecting state of the sliding support arm 26 and contributes to improving the shape retaining strength of the temporary fastening structure 2.

  The sliding support arm 26 includes an inner peripheral surface of a ring-shaped relay frame 28 disposed in the middle of the surrounding wall 12 of the temporary cut-off structure 2, and a ring-shaped top end disposed at an upper end portion. It protrudes from the inner peripheral surface of the frame 29 and is provided in three stages, upper and lower, within the temporary cutoff structure 2.

  Therefore, a total of twelve ball bearings 27 slide on the four (four places) descent rails 25, so that the provisional cut-off structure 2 can move down and move smoothly with respect to the pier 1 while maintaining the posture. It is configured as follows.

  Next, the working scaffold is removed, and the temporary closing structure 2 is lowered to the pier 1 with respect to the pier 1 through the lowering guide 24 by the lifting device, and then the upper edge of the surrounding wall 12 of the temporary closing structure 2 By placing an anti-floating bracket 31 above the section and fixing it to the pier 1, the anti-floating bracket 31 comes into contact with the top end frame 29 provided on the upper edge of the enclosure wall 12 of the temporary cut-off structure 2. The temporary cut-off structure 2 that is going to rise by buoyancy is stopped in water.

  In the drawing, the temporary closing structure 2 is installed on the pier 1 so that the bottom of the temporary cutting structure 2 reaches the foundation 35 of the pier 1, and the through hole 3 of the temporary closing structure 2 and the foundation 35 of the pier 1 The case where the gap | interval part 4 arises between is shown.

  Next, the gap 4 between the through hole 3 of the temporary closing structure 2 and the foundation 35 of the pier 1 is stopped.

  The water stop construction method of the temporary cutoff structure which is the principal part of a present Example is demonstrated.

  First, the gap 4 is closed with concrete leakage means 5.

  The concrete sealing means 5 of this embodiment is provided with a sealing sheet 32 on the temporary closing structure 2 so as to cover the bottom thereof, and the sealing sheet 32 is connected to the through-hole portion 3. A central hole portion 33 is provided, and a hole edge sheet portion 34 folded back above the central hole portion 33 surrounds the pier 1 in the gap portion 4 between the through hole portion 3 and the pier 1. A sealing tube 9 made of an elastic material (for example, rubber (natural rubber or synthetic rubber)) is wound around the outer edge sheet portion 34 of the sealing sheet 32, After the temporary closing structure 2 is lowered into the water under the bridge, a fluid is injected into the leakage tube 9, and the leakage tube 9 that expands by the fluid injection causes the hole edge sheet portion 34 to be connected to the outer peripheral surface of the pier 1. (The gap 4 is blocked by the sealing tube 9 and the sealing sheet 32). Is it), and prevents the concrete 6 to be described later from leaking from the gap portion 4 downward provisional deadlines structure 2 bottom (see FIGS. 5 and 6).

  More specifically, as shown in FIGS. 5 and 6, the sealing sheet 32 is formed in a ring shape corresponding to the shape of the bottom plate material 11 so as to cover the entire bottom surface of the bottom plate material 11 from below. Is provided.

  Further, the outer peripheral edge portion of the sealing sheet 32 is folded back upward and bonded to the outer peripheral edge portion of the bottom plate member 11, and the hole of the central hole portion 33 which is the inner peripheral portion of the sealing sheet 32 The edge sheet portion 34 is folded back so as to rise upward and is disposed from the hole edge of the through-hole portion 3 to the upper surface side of the bottom plate member 11.

  Further, the inner frame 16 constituting the bottom plate member 11 of the temporary cut-off structure 2 has a U-shaped cross section, and the leakage tube 9 is accommodated in the inner groove portion of the inner frame 16. The leakage tube 9 is wound around the outer edge sheet portion 34.

  In addition, you may employ | adopt the concrete sealing means 5 by which the clearance gap part 4 is block | closed by the sealing tube 9, without providing the sealing sheet 32. FIG.

  Next, rebars 7 previously assembled on the water are lowered above the gap 4 and the bottom plate member 11, and anchor bars 8 are attached to the outer peripheral surface of the pier 1 above the gap 4. The reinforcing bars 7 and the anchor bars 8 may be installed before the gap 4 is closed by the concrete leakage means 5. Moreover, the design of the form of the reinforcing bars 7 and the number of anchor bars 8 can be appropriately changed according to the situation at the site.

  Next, the concrete 6 is filled into the gap 4 from above the concrete leakage means 5 blocking the gap 4 in the water that has entered the temporary cutoff structure 2. The anchor bars 8 are buried (buried) and the concrete 6 is hardened.

  That is, the gap 4 is sealed and water is stopped by hardening of the concrete 6, and the strength improvement effect of the hardened concrete 6 layer by the reinforcing bars 7 and the firm positioning of the temporary closing structure 2 to the pier 1 by the anchor bars 8. It is comprised so that an effect may be exhibited.

  Further, in this embodiment, the concrete 6 is filled in the entire range of the upper portion of the bottom plate material 11 in addition to the gap portion 4, and further, the worker can easily work on the hardened concrete 6 layers. The upper surface of the concrete 6 is formed into a flat surface (see FIGS. 1 and 6).

  After the water-stopping of the temporary cutoff structure 2 by the hardening of the concrete 6 is completed, the water entering the temporary cutoff structure 2 is drained by a pump or the like to make the temporary cutoff structure 2 a work dry area, and the construction is completed. Become.

  After the repair and reinforcement work for the pier 1 is completed, the six layers of concrete are rolled up, and the temporary cut-off structure 2 is raised and removed.

  A second embodiment of the present invention will be described with reference to FIGS.

  The present embodiment is a case where the configuration of the bottom plate 11 of the temporary closing structure 2 and the configuration of the concrete sealing means 5 are different from those of the first embodiment.

  First, the bottom plate material 11 of the present embodiment will be described. As in the first embodiment, the bottom plate member 11 is composed of a bottom frame 15 and a floor plate 19 attached to the bottom frame 15. The configuration is different from that of the first embodiment.

  Specifically, the bottom frame 15 of the present embodiment includes an outer frame 17 equivalent to that of the first embodiment, and a plurality of frames disposed radially inside the outer frame 17 from the center of the outer frame 17. The floor plate 19 of the present embodiment is made of a metal plate material in the shape of a circular arc in plan view that is laid between the plurality of the support frames 17.

  Then, the floor plate 19 is installed between the plurality of support frames 36 of the bottom frame 15 so as to have a donut disk shape in a plan view, and the circular hole portion inside the floor plate 19 is the through hole portion. The bottom plate material 11 functioning as 3 is configured (see FIG. 8).

  In addition, the installation structure of the floor plate 19 on the support frame 36 is such that the end portions of the floor plate 19 adjacent to the upper flange portion of the support frame 36 made of steel material having a cross-sectionally rolled H shape are adjacent to each other. A pressing frame 39 employing an angle material is placed on the floor plate 19 so as to be placed between the support frames 36 while being placed in abutment state. The upper flange portion of the support frame 36 and the floor plate A bolt 37 is provided so as to penetrate the end of 19 and the pressing frame 39, and the floor plate 19 is installed and fixed to the support frame 36 by tightening a nut 38 screwed to the bolt 37 ( (See FIG. 9). Reference numeral 40 in the drawing is a connection member that is fixed in an erected state on the upper surface between the butted end portions of adjacent floor plates 19 and connects the butted end portions of the floor plates 19 to each other. A configuration in which the butted ends of the floorboard 19 are welded to each other without using the connecting member 40 may be employed.

In the case of the present embodiment in which the bottom plate member 11 of the temporary closing structure 2 is configured in this manner, the temporary closing structure 2 after construction is lowered into the water with respect to the pier 1 via the lowering guide 24 by the lifting device. Then, the anti-floating bracket 31 is arranged above the upper edge of the enclosure wall 12 of the temporary cutoff structure 2 and fixed to the bridge pier 1, and in addition to the bottom plate material 11 of the temporary cutoff structure 2. wherein the outer peripheral surface of the foundation 35 of the pier 1 by attaching a substantially triangular frame-shaped floating preventing water brackets 41, the bottom plate member 11 connected to fixed to the upper frame portion of the floating preventing water bracket 41.

  That is, in this embodiment, the anti-floating bracket 31 is in contact with the top end frame 29 provided on the upper edge of the enclosure wall 12 of the temporary cut-off structure 2, and the bottom plate 11 is attached to the anti-floating underwater bracket 41. By being fixed, the temporary cutoff structure 2 which is going to rise by buoyancy is stopped in water (see FIG. 7).

  The anti-floating underwater bracket 41 is constructed by assembling steel materials having a T-shaped section or an L-shaped section into a substantially triangular frame shape, and uses anchor bolts (not shown) attached to the foundation 35 of the pier 1. The base 35 is attached and fixed to the outer peripheral surface.

  Further, as shown in FIGS. 9 to 11, the connecting and fixing structure of the floating prevention underwater bracket 41 and the bottom plate member 11 is provided on the lower frame portion of the bottom plate member 11 on the upper frame portion of the floating prevention underwater bracket 41. The flange portion is mounted in a superposed manner, and this overlapped portion is configured to be clamped and fixed using a connecting fitting 42 having a tightening bolt 44 at both free ends of the U-shaped main body 43.

  In addition, it uses a structure that tightens and fixes with bolts and nuts that penetrate through the overlapping part between the upper frame part of the anti-floating underwater bracket 41 and the lower flange part of the support frame 36, without using the connecting bracket 42. You may do it.

  Further, the mounting work of the anti-floating underwater bracket 41 to the pier 1, the connecting and fixing work of the bottom plate 11 to the anti-floating underwater bracket 41, and the installation work to the gap 4 of the mold plate 10 to be described later are: Although the underwater work is performed by a diver under the temporary cutoff structure 2, the temporary cutoff structure 2 of the present embodiment is below the bottom plate material 11 so that it is not easily affected by the flow of water or waves at this time. A protective wall 45 is suspended.

  The guard wall 45 is formed in a cylindrical wall body having a required height (depth) by combining and connecting the divided wall members 13 in the same manner as the surrounding wall 12, and the guard wall 45 is formed in the lower groove portion of the outer frame 17. Since the lower divided wall member 13 is fitted and connected, a guard wall 45 is suspended downward from the bottom plate member 11 (see FIGS. 7, 10, and 11).

  In this embodiment, when the anti-floating underwater bracket 41 and the bottom plate material 11 are connected and fixed, the gap portion 4 between the through-hole portion 3 and the pier 1 is configured differently from the first embodiment. It is closed with concrete leakage means 5.

  Next, the concrete leakage means 5 of the present embodiment will be described in the case where a mold plate 10 is installed in the gap portion 4 so that the gap portion 4 is closed by the mold plate 10. .

  Specifically, the mold plate 10 is installed in the gap portion 4 so as to block the entire outer periphery of the gap portion 4 by being vertically installed between the inner end portions of the respective support frames 36. The outer mold plate 46 and the support frame 36 are installed between the lower ends of the support frames 36 so that the lower end of the gap 4 is closed by the inner end contacting the outer peripheral surface of the foundation 35 of the pier 1. And a lower mold plate 47 installed in the gap portion 4.

  Also, the outer frame plate 46 is installed in such a manner that the outer frame plate 46 is superposed on the flange portion provided at the inner end of the support frame 36, and the superposed portion of the outer mold plate 46 and the inner flange portion is overlapped. By tightening a mounting bolt 48 and a mounting nut 49 provided so as to penetrate, the outer frame plate 46 is attached to the inner end portion of the support frame 36 and installed in the gap portion 4 (FIGS. 10 and 10). 11).

  Further, the lower mold plate 47 is installed such that when the bottom plate member 11 is connected and fixed to the anti-floating underwater bracket 41, it is interposed between the upper frame portion of the anti-floating underwater bracket 41 and the lower end portion of the support frame 36. By sandwiching the outer portion of the lower mold plate 47, the lower mold plate 47 is attached to the support frame 36 and installed in the gap 4 (see FIGS. 9 to 11).

  In the present embodiment, the shape that also has the function of a reinforcing bar on the outer peripheral surface of the pier 1 above the gap 4 before or after the gap 4 is closed with the concrete leakage means 5. Then, the anchor bar 8 is attached, and then the concrete part 6 is filled with the concrete 6 from above the concrete leaking means 5 so that the anchor bar 8 is embedded. 4 is sealed and water is stopped.

  Moreover, in the case of a present Example, the concrete 6 is filled so that the bridge pier 1 side of the upper surface of the bottom plate material 11 (about 1/3 of the upper surface of the bottom plate material 11 in the inside / outside direction) may be filled in addition to the gap portion 4. The case is shown (refer FIG. 7, FIG. 11).

  Other configurations are the same as those of the first embodiment.

  The present invention is not limited to the first and second embodiments, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Temporary cutoff structure 3 Through-hole part 4 Gap part 5 Concrete sealing means 6 Concrete 7 Reinforcement 8 Anchor reinforcement 9 Sealing tube
10 Formwork
41 Anti-floating underwater bracket

Claims (5)

  At the non-submerged area above the pier, a through-hole part that penetrates the pier is provided at the bottom, and a temporary fastening structure that is installed so as to surround the outer periphery of the pier is constructed. Then, the gap between the through hole and the pier is closed with concrete sealing means, and then the gap is filled with concrete, and the gap is sealed and water is stopped by hardening of the concrete. This is a water stop method for temporarily closing structures used in pier repair and reinforcement works.   The water stop of the temporary closing structure for use in bridge pier repair / reinforcement work according to claim 1, wherein a reinforcing bar is disposed above the gap, and the reinforcing bar is embedded in the concrete filling the gap. Construction method.   The pier according to any one of claims 1 and 2, wherein an anchor bar is attached to the outer peripheral surface of the pier near the gap, and the anchor bar is embedded in the concrete filling the gap. Water stoppage method for temporary cutoff structures used for repair and reinforcement work.   In the concrete sealing means, a sealing tube having elasticity is wound around the gap portion so as to surround the pier, and the gap portion is blocked by the sealing tube that expands by injecting fluid. It is comprised as follows. The water stop construction method of the temporary closing structure used for the pier repair and reinforcement construction of any one of Claims 1-3 characterized by the above-mentioned.   The concrete leak-proofing means is configured such that a mold plate is installed in the gap, and the gap is closed by the mold plate. A water stoppage method for a temporary closing structure used in the pier repair and reinforcement work described in item 1.

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