JP2014169596A - Repair method for existing irrigation channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability in a repair method for an existing irrigation channel having a retaining wall formed of a sheet pile steel plate 01.SOLUTION: A channel-side front position of a sheet pile steel plate 01 is excavated, and a gabion 1 is laid on an excavated location. A narrow concrete panel 4 having a downward inclined leg part 42 protrusively provided on a lower front surface is driven into a channel bottom surface on the backside of the gabion on the excavated location, and the inclined leg part 42 is positioned on the gabion 1. Thus, a retaining wall surface self-standing on the front surface of the sheet pile steel plate 01 is formed. A clearance between the retaining wall surface and the sheet pile steel plate is filled with a proper filler 9.

Description

  The present invention relates to a repair method for an existing water channel in which a retaining wall is formed of a sheet pile steel plate.

  There is known a irrigation channel having a structure in which sheet pile steel plates are driven into both banks to form retaining walls, and headboard concrete is cast on the upper ends of the sheet pile steel plates. These irrigation channels need to be repaired because the sheet pile steel plate portion corrodes due to aging.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-129537) discloses a construction method in which an upper portion of a sheet pile steel plate is removed together with a headboard portion, and a retaining wall is constructed by a new concrete sheet pile along the inside of the lower sheet pile steel plate. ing.

  Patent Document 2 (Japanese Patent Laid-Open No. 2012-180728) discloses that a steel plate having a predetermined shape is formed in advance at a factory in correspondence with the location of the sheet pile steel plate that has been damaged, and the damaged portion is covered with the steel plate. A technique for repairing is disclosed.

JP 2002-129537 A. JP2012-180728A.

  As a countermeasure against the aging of the irrigation channel using sheet pile steel plate as the retaining wall, the means to replace the concrete sheet pile as described in Patent Document 1 requires the same work as the construction work of a new irrigation channel, and the corresponding cost. Is required. In addition, in order to cope with the back pressure received from both sides of the channel by the concrete sheet pile itself, the sheet pile itself needs to have its own weight and strength, and in order to prevent the collapse to the water channel side, the concrete sheet pile on the lower channel side of the concrete sheet pile. It is necessary to project a large support and to install a new beam.

  As described above, when a means for constructing a concrete sheet pile by removing the upper portion of the sheet pile steel sheet is adopted as a countermeasure against the aging of the sheet pile steel sheet, the workability is inferior due to the weight of the concrete sheet pile and the cost becomes high.

  The existing sheet pile steel plate is corroded by contact with the water flow of the irrigation channel, but the fact that the water channel has been secured before repairing can withstand the earth pressure from both sides of the irrigation channel. Only a part of the steel plate and the surface part are corroded. Although it is urgently possible to cover only the damaged part with a steel plate as described in Patent Document 2, even if the necessary part is repaired, aging of the remaining unrepaired part appears immediately, so it is realistic. It is not a repair method.

  Therefore, the present invention proposes a new repair method for existing waterways that uses lightweight concrete sheet piles.

  The repair method for an existing water channel according to the present invention is a repair method for an existing water channel in which a retaining wall is formed of a sheet pile steel plate, and a downward inclined leg portion is protruded downward from the front side of the water channel side of the sheet pile steel plate. A narrow concrete panel is driven into the bottom of the water channel to form a retaining wall surface that is self-supporting on the front surface of the sheet pile steel plate, and a gap between the retaining wall surface and the sheet pile steel plate is filled with an appropriate filler.

  Thus, a new retaining wall is constructed in front of the existing sheet pile steel plate with a concrete panel. The retaining wall is made self-supporting by driving appropriately to the bottom of the irrigation channel, along with the existing sheet pile steel plate (the portion not in contact with the water flow is not corroded and sufficiently withstands earth pressure at the time of repair), It will bear the earth pressure on both sides of the irrigation channel, and there is no need to calculate the weight of the concrete panel itself, and the concrete retaining wall can be constructed with easy construction work.

  Moreover, the repair method of the existing use channel which concerns on this invention (Claim 2) excavates the front position by the side of the channel of a sheet pile steel plate, lays a gabion in an excavation location, and an inclined leg part is located on the said gabion. The concrete panel is driven in, and the inclined leg portion is supported by the gabion, and the concrete panel is prevented from sinking or falling down toward the center of the irrigation channel.

  The repair method for an existing waterway according to the present invention (Claim 3) is formed by projecting a receiving portion at a predetermined height of a sheet pile steel plate, and connecting the standing concrete panel top surface and the receiving portion with a connecting rod. Thus, the upper part of the concrete retaining wall is connected to the existing sheet pile steel plate, and the concrete panel is prevented from falling down toward the center of the irrigation channel.

  The repair method for an existing waterway according to the present invention (Claim 4) is a method in which an anchor member is protruded at an appropriate location of a sheet pile steel plate and a cement filler is used. It is integrated by hardening of the filler, and a robust repair retaining wall is constructed.

  The repair method for an existing waterway according to the present invention (Claim 5) is mainly composed of a lightweight foamed resin body in a space formed between a concrete panel and a sheet pile steel plate, particularly when the cement-based filler is employed. In the gap space between the sheet pile steel plate and the retaining wall plate where the uneven surface is continuous, the filler body is built in the concave surface of the sheet pile steel plate to reduce the amount of filler. be able to.

  The present invention is as described above, in which a lightweight concrete panel is made self-supporting, and a concrete retaining wall that bears earth pressure on both sides of the canal along with the existing sheet pile steel sheet is constructed to repair the existing canal. It is said that it was able to efficiently repair the irrigation canal that can be fully handled.

Explanatory drawing of the use member which shows embodiment of this invention method. The process explanatory drawing (before construction). The same figure (before panel driving). The figure (when driving the panel). The figure (when completed).

  Next, embodiments of the present invention will be described in the order of construction. As for the existing irrigation channel to be repaired, the sheet pile steel 01 is driven into the ground (bottom of the irrigation channel) 02 to receive back pressure from both banks to secure the channel 03, and a headboard part 04 is provided at the upper edge of the sheet pile steel plate 01 The irrigation channel is constructed (Fig. 2).

  In the repair of the irrigation channel, first, the irrigation channel bottom surface 02 immediately before the sheet pile steel plate 01 is excavated, and the gabion 1 is laid on the irrigation channel center side of the excavation site A (FIG. 3).

  Further, the anchor member 2 is fixed to a desired location on the inner wall surface of the sheet pile steel plate 01 by an appropriate means such as welding or screwing, and the receiving portion 3 is projected at a location corresponding to the top height of the retaining wall to be constructed. Set up. The receiving portion 3 is L-shaped, and has a vertical plate portion fixed to a sheet pile steel plate 01 and a connecting hole 31 provided in a horizontal plate portion.

  Next, the concrete panel 4 is installed and the filler 5 is installed. The concrete panel 4 has a narrow width that can be easily handled by human power, and the side edge portion 41 overlaps with the adjacent panel without any gap. It has a stepped shape so as to stand up in a row, and is provided with a downward inclined leg portion 42 on the lower front surface, and the lower edge portion 43 is formed to be gradually thinner.

  The filling body 5 is a core material mainly composed of a lightweight foamed resin body, the outer peripheral surface of which is covered with a metal net, and the concrete panel 4 is driven into the water channel bottom surface 02 so that the inclined leg portion 42 is supported by the gabion 1. The filler 5 is installed in the space B behind the concrete panel 4 that has been driven. Note that crushed stone 6 is appropriately laid on the bottom surface of the excavation site A and the upper surface of the inclined leg portion 42 (FIG. 4).

  When the concrete panel 4 is driven and a continuous surface in the standing state is formed, a long top jig 7 having a U-shaped cross-section of the lower opening is fitted and attached to the top of the adjacent concrete panel 4, and One end of the connecting rod 8 on the snail is mounted in the connecting hole 31 of the receiving portion 3, and the other end is hooked on the top jig 7.

  A cement-type filler 9 such as mortar is placed in the space behind the concrete panel 4, and the sheet pile steel plate 01 and the concrete panel 4 are united by hardening the filler 9, and a repair retaining wall with the concrete panel 4 as the surface is constructed. (FIG. 5).

  The above-mentioned repair retaining wall has the concrete panel 4 as a formwork, and it is not necessary to remove any existing sheet pile steel plate 01, and the concrete panel 4 is self-supporting, and the existing sheet pile steel plate 01 bears the earth pressure on both sides of the irrigation channel. Therefore, there is no need to determine the weight of the concrete panel itself, and a repair waterway equipped with a concrete revetment can be constructed by a simple operation.

DESCRIPTION OF SYMBOLS 1 Gabion 2 Anchor member 3 Receiving part 31 Connection hole 4 Concrete panel 41 Side edge part 42 Inclined leg part 43 Lower edge part 5 Filling body 6 Crushed stone 7 Top jig 8 Linking anchor 9 Cement-based filler 01 Sheet pile steel 02 Ground Bottom)
03 Waterway 04 Kasagibe

Claims (5)

  It is a repair method for an existing water channel that has a retaining wall made of sheet pile steel plate, and a narrow concrete panel with downwardly inclined legs projecting downward on the front surface of the sheet pile steel plate is driven into the bottom surface of the water channel. A method for repairing an existing waterway, wherein a retaining wall surface that is self-supporting is formed on a front surface of a steel plate, and a gap between the retaining wall surface and the sheet pile steel plate is filled with an appropriate filler.   The repair method of the existing waterway of Claim 1 which excavates the front position by the side of the water channel of a sheet pile steel plate, lays a gabion in an excavation location, and drives in a concrete panel so that an inclined leg part may be located on the said gabion.   3. The repair method for an existing water channel according to claim 1 or 2, wherein a receiving portion is provided at a predetermined height of the sheet pile steel plate, and the standing concrete panel top surface and the receiving portion are connected by a connecting rod.   The repair method for an existing water channel according to any one of claims 1 to 3, wherein a cement-based filler is employed by protruding an anchor member at an appropriate location of the sheet pile steel plate. The method for repairing an existing waterway according to claim 4, wherein the space formed between the concrete panel and the sheet pile steel plate is internally provided with a filler mainly composed of a lightweight foamed resin body.

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