JP7051058B2 - Repair method for existing irrigation canals - Google Patents

Description

The present invention relates to a repair method for an existing irrigation canal in which a retaining wall is formed of a sheet pile.

It is known that irrigation canals and drainage canals have a structure in which sheet steel sheet piles are driven into both banks to form retaining walls, and Kasagi concrete is placed on the upper ends of the sheet piles. These irrigation canals require repair because the sheet piles of the sheet piles are corroded due to aging. Even if some corroded parts are repaired, other parts will eventually need to be repaired, so a means to construct a new retaining wall not only on the corroded parts but also on the surface side of the sheet pile is proposed. ing.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2014-88753) was previously proposed by the present applicant, and a panel mounting portion is provided on a reinforcing material mounted at an appropriate position on a sheet metal sheet metal, and a panel mounting portion is provided from the bottom surface of the irrigation canal to the lower part of the cap tree portion. A retaining wall plate made of a thin metal plate such as an FRP resin plate or a thin steel plate with an appropriate width at a height that can be reached is attached to the panel mounting portion so as to continuously cover the surface of the existing sheet metal plate plate with the adjacent retaining wall plate. A new surface retaining wall is formed by filling and casting a cement-based filler between the existing sheet metal sheet metal and the newly provided retaining wall plate.

Further, a panel is connected to the tip of a connection bar attached to a concrete retaining wall shown in Patent Document 2 (Registered Utility Model No. 3201577), and concrete is filled and cast between the panel and the retaining wall plate to provide a new surface retaining wall. The means for constructing the wall is also adopted for the repair of the irrigation canal of the sheet pile (stoppane method, registered trademark).

As shown in Patent Documents 1 and 2, it has been proposed and implemented by means for constructing a new retaining wall on the outside of the sheet pile, but a surface newly constructed by the above means. It can be said that the retaining wall is integrated with the sheet pile with filled concrete, but this surface retaining wall has a sandwich structure of the sheet pile and the retaining wall, and both are connected by a connecting member attached to the sheet pile. It's just done. Even if the mounting location of the connecting member is set to a location where the degree of corrosion is small, the strength of the sheet pile is naturally reduced due to aging. For this reason, the durability of the newly constructed surface retaining wall against earth pressure will be borne by the corroded sheet pile itself, and the weakening of the sheet pile may cause the surface retaining wall to peel off and collapse. End up

As disclosed in Patent Document 3 as the above-mentioned countermeasure, the present applicant drives the pillar piles behind the existing retaining wall formed of the sheet pile at appropriate intervals, and the existing sheet pile at the position corresponding to the support pile. A retaining wall is formed in the through hole, an appropriate connecting member is connected to the pillar pile through the through hole, and a retaining wall plate is connected and arranged so as to cover the sheet pile steel plate surface side to the connecting member protruding from the through hole, and the retaining wall is connected and arranged. We proposed a repair method that builds a surface retaining wall by filling the back of the board with an appropriate filler.

Japanese Unexamined Patent Publication No. 2014-88753. Registered Utility Model No. 3201577. Japanese Unexamined Patent Publication No. 2018-28254.

In order to reduce the load load on the surface retaining wall constructed for repair, it was proposed to provide a back support as described in Patent Document 3, but the back support provided in the soil on the back surface of the sheet pile and the surface retaining wall The work of connecting the retaining wall boards that form the wall is complicated.

Therefore, the present invention is embedded below the bottom of the irrigation canal, which is provided on the upper edge of the existing irrigation canal, which maintains robustness, and the caps, and the bottom of the irrigation canal, when the irrigation canal is repaired using the sheet pile. Focusing on the sheet piles that are corroded, we proposed a repair method for existing irrigation canals that constructs a covering retaining wall that does not impose a burden on the corroded sheet piles.

The method for repairing an existing irrigation canal according to the present invention is to directly cover the surface of the sheet pile with mortar or concrete in an existing irrigation canal in which a retaining wall is formed of a sheet pile, and the vertical main core bar of the mortar or concrete covering layer is a sheet pile. On the front side of the steel plate, the upper end of the vertical main core bar is connected to the abdominal member or cap tree provided on the upper edge of the existing irrigation canal, and the lower end is connected to the buried sheet pile below the bottom of the irrigation canal to build an upright structure. Then, after connecting the horizontal core bar, the mesh core material, or both to the vertical main core bar, a mortar spraying work or a concrete spraying work is applied to the core material (the invention according to claim 1), or the above-mentioned. The feature is that a mold is placed in front of the core material, and mortar or concrete is placed between the sheet pile and the mold (the invention according to claim 2) to construct a covering retaining wall. be.

Therefore, the vertical main core muscle is an abdominal member that maintains robustness (generally H steel is used, so its back or inner surface) or the cap tree part, and the bottom of the irrigation canal (below the ground). By connecting to a buried sheet pile that is buried in the steel plate and maintains its robustness with less progress of corrosion, the entire covering retaining wall to be constructed can stably receive the back earth pressure, and the sheet pile is aged. It is possible to construct a new covering retaining wall with durability that does not burden the steel plate part.

In the method for repairing an existing irrigation canal according to claims 3 and 4 of the present invention, the vertical main core bars are used as columns, reinforcing bars or reinforcing bar cages, and desired members can be appropriately selected and used.

The method for repairing an existing irrigation canal according to claims 5 and 6 of the present invention specifies an upper connecting structure of the vertical main core bar, and in the invention according to claim 5, the upper end of the vertical main core bar is made of H steel. It abuts and connects to the lower vertical surface of the formed abdominal raising member, and serves as an erection standard when constructing the vertical main core muscle, facilitating construction.

The invention according to claim 6 of the present invention is formed by connecting the upper end of the vertical main core bar to the cap tree portion by mortar or concrete filled in a hole drilled in the cap tree portion, and is an abdominal raising member. The vertical main core bar can be constructed more robustly than the connection with (welding / screwing).

The method for repairing an existing irrigation canal according to claims 7 and 8 of the present invention specifies a downward connecting structure of a vertical main core bar, and the invention according to claim 7 is downward on a sheet pile at the bottom of an existing irrigation canal. A through hole is provided, and a back hole extending from the back surface of the sheet pile to the bottom of the irrigation canal is excavated on the back surface of the lower through hole, and the lower end portion of the vertical main core is connected to the sheet pile across the lower through hole. By directly connecting the lower end of the construction vertical main core bar to the buried sheet pile, the buried sheet pile bears the load of the new covering retaining wall.

In the invention according to claim 8, a lower through hole is provided in the sheet pile at the bottom of the existing irrigation canal, and a back hole extending from the back surface of the sheet pile to below the bottom of the irrigation canal is excavated on the back surface of the lower through hole to form a back hole below the bottom of the irrigation canal. The lower end portion of the vertical main core bar is connected to the connecting member that is locked and connected to the buried sheet pile, and the connecting member that connects the vertical main core bar is embedded through the drilled lower through hole. It will be connected to the sheet pile, and the buried sheet pile will bear the load of the new covering retaining wall.

The repair method of the present invention is as described above, and the new covering retaining wall formed on the surface of the sheet pile is connected to the raised member or the cap tree part that maintains the robustness and the vertical main to the buried sheet pile. It is supported by core bars and appropriate horizontal core bars, etc., and is constructed by spraying or placing mortar or concrete. It is possible to construct a covered retaining wall without burden, and it will be a new retaining wall with durability.

A cross-sectional view of an existing irrigation canal before construction, which is the object of the construction method of the present invention. Explanatory drawing of the preparatory work for the existing irrigation canal at the time of the implementation. An explanatory view (cross-sectional view) of an example of a mounting location of a support column (vertical main core bar) of the first embodiment. The same figure (plan view). Explanatory drawing of the pillar construction work (direct connection of the first embodiment). The figure (using the connecting member of the second embodiment). The figure (explanatory view of other connecting members / connecting members of the third and fourth embodiments). The figure (explanatory view before mounting of the connecting member of the third embodiment). The figure (explanatory view after mounting of the connecting member of the third embodiment). The figure (explanatory drawing of use of connecting member of 4th Example). The figure (using the support block body of the fifth embodiment). Explanatory drawing which shows the construction state of the 1st Embodiment. Explanatory drawing which shows the construction order. Explanatory drawing which shows the construction state of the 2nd Embodiment. Explanatory drawing which shows the construction order.

In the irrigation canal to be repaired to which the method of the present invention is applied, the sheet pile plate 01 is driven into the ground (bottom surface of the irrigation canal) 02 to receive the back pressure (earth pressure) from both banks to secure the irrigation canal 03, and the sheet pile plate 01 is used. A Kasagi section 04 is provided on the upper edge to construct an irrigation canal. Further, in the cap tree portion 04, in order to increase the earth pressure durability, an abdominal raising member (generally H steel is adopted) 05 is arranged on the front surface, and there is also a water channel in which a girder member 06 is erected between the facing cap trees.

In the construction method of the present invention, when a new covering retaining wall X made of mortar or concrete is constructed on the front surface (surface facing the irrigation canal) of the sheet pile plate 01 of the existing irrigation canal, the core material which is the essence of the covering retaining wall X. Of these, a specific construction method is adopted for the vertical main core bar, and the first embodiment exemplifies a construction method in which the support column 1 is adopted for the vertical main core bar and the covering retaining wall is constructed by spraying. The second embodiment illustrates a construction method in which a reinforcing bar (reinforcing bar cage) 1a is adopted as the vertical main core bar and a covering retaining wall is constructed by a casting work using the formwork Z.

In the first embodiment, the column 1 is basically installed (post installation work), the horizontal core bar 2 and the mesh core material 21 are attached to the support column 1 (bar arrangement work), and the front surface of the sheet pile steel plate 01 is covered. It is intended to spray mortar and concrete. Further, in the second embodiment, the reinforcing bar 1a is installed instead of the support column 1 (the same configuration as the support column installation work of the first embodiment can be adopted), and the horizontal core bar 2 is connected to the reinforcing bar 1a (reinforcing bar arrangement work). ), After forming a predetermined core material, the formwork Z is arranged on the front surface of the core material, and mortar or concrete is placed between the sheet pile steel plate 01 and the formwork Z.

Further, in each of the above-mentioned constructions, the construction zone is appropriately divided according to the length of the covering retaining wall X to be constructed, or each construction that should be partially preceded is appropriately carried out.

Further, in the construction of the construction method of the present invention (first embodiment and second embodiment), preparatory construction is performed in advance for the existing irrigation canal. First, in order to expose the buried sheet pile plate 01a, which is the basis for connecting the lower ends of the columns (vertical main core bars) 1, the front surface of the sheet pile plate 01 is excavated at the bottom surface 02 of the irrigation canal to form a front hole A, and the sheet pile sheet plate 01 is formed. A lower through hole B having an appropriate size and shape corresponding to the means for connecting the support column 1 to the buried sheet pile steel plate 01a is bored at the bottom of the support, and the back surface of the buried sheet pile steel plate 01a is exposed from the lower through hole B. The hole C is excavated and formed. Next, a hole D is formed in the upper portion of the sheet pile plate 01 in the Kasagi portion 04.

The formation of the lower through hole B, the back hole C, and the drilling D (Da) is not necessarily an indispensable preparatory work, and the upper end portion of the support column constructed in each adopted embodiment (Example) is raised. It is adopted if necessary for connecting to a member or a cap tree portion and connecting the lower end portion to the buried sheet pile steel plate 01a.

Next, the first embodiment of the method of the present invention will be described. In the first embodiment, the column 1 is erected to construct the vertical main core bar, and the erection position of the column 1 in the column installation work, the connection point with the cap tree portion 04 and the abdominal raising member 05, and the connection means are As shown in FIGS. 3 and 4, it is appropriately selected and adopted.

For example, the upper end of the column (square column, etc.) 1 is positioned on the back surface 05A of the abdominal member 05 and connected to the abdominal member 05 by welding or bolts, or the column 1 is inserted into the cap tree portion 04 in the upper end direction of the column 1. It is also possible to make a hole D having a size that enables the drilling, to project the upper end portion of the support column 1 into the hole D, and to integrate the hole D with the Kasagi portion 04 by filling the hole D with concrete. .. This support column 1 is located in the valley portion 01A of the sheet pile plate 01 and is flush with the mountain portion 01B (a in FIGS. 3 and 4).

Alternatively, a drilling Da having a size capable of inserting the reinforcing bar 07 is drilled in the cap tree portion 04 in the upper end direction of the support column 1, and the reinforcing bar 07 is provided from the drilling Da in the support column (provided with a knot plate near the upper end portion) 1. It is also possible to insert concrete into the upper end portion of the drilling Da and the support column 1 so that the support column 1 and the cap tree portion 04 are integrated (B of FIGS. 3 and 4).

Alternatively, the upper end of the support column 1 is positioned on the inner side surface 05B of the raised member 05 and connected (welded / bolted). This support column 1 is located outside the sheet pile plate 01 (C and D in FIGS. 3 and 4).

Various methods can be adopted as the connecting means between the support column 1 and the buried sheet pile steel plate 01a. For example, in the means for directly connecting the support column 1 to the buried sheet pile steel plate 01a (FIG. 5, the first embodiment), the lower end portion of the support column 1 is bent into a hook shape, and the bent portion 11 is formed in the front hole A by a welding means or a bolt. Although it may be directly connected by such means, the bent portion 11 is placed on the lower edge of the lower through hole B, the lower end of the support column 1 is inserted into the back hole C, and concrete is placed in the back hole C by the filling casting work to be performed later. By casting, the lower end portion of the support column 1 may be integrated with the embedded sheet pile steel plate 01a.

Further, it is possible to adopt a means for mounting appropriate connecting members 3, 3a, 3b on the buried sheet pile steel plate 01a and mounting the support column 1 on the connecting members 3, 3a, 3b. When adopting the connecting members 3, 3a, 3b, the front hole A of the buried sheet pile plate 01a is excavated in advance over the entire length of the sheet pile to form a front groove E, and the front hole A (front groove E) is formed. A crushed stone 5 is laid, a foot steel material 6 is buried as appropriate, and concrete is cast as necessary to build a foundation Y.

As shown in FIG. 6, the connecting member 3 used in the second embodiment is provided with a support hole 32 corresponding to the installation position of the support 1 on the connecting horizontal plate 31, and is a clog-shaped material holding the buried sheet pile steel plate 01a on the lower surface. The sandwiching portion 33 is provided.

In the connecting member 3, the strut 1 is inserted through the strut hole 32, a part of the connecting member 3 is inserted into the back hole C, and the embedded sheet pile plate 01a is sandwiched by the sandwiching portion 33 to fix the connecting member 3. be. If the drilled hole D is not drilled or if it is connected to the inner surface 05B of the abdominal raising member 05, the strut 1 inserted into the strut hole 32 is lifted (the front hole A is filled with crushed stone 5 or the like). (Or fixed to the connecting member 3), connected and fixed to the abdominal raising member 05.

Further, when the support column 1 is directly connected to the buried sheet pile steel plate 01a or when the connection member 3 (including the connection members 3a and 3b described later) is adopted, the concrete 4 is placed in the back hole C after the support column is fixed. Robust integration between the support column 1 and the buried sheet pile steel plate 01a can be achieved.

The connecting member 3a used in the third embodiment is made of U-shaped steel as shown in FIG. 7A, and has a foot plate portion 32a and a strut mounting portion in the insertion rod 31a into which the rear portion is inserted into the lower through hole B. The foot plate portion 32a is provided under the rear lower surface of the insertion rod 31a, and a position adjusting bolt 34a whose axial direction is the insertion direction of the insertion rod 31a is attached to the foot plate portion 32a. A support plate 331 projecting from the side surface of the insertion rod 31a at a predetermined position in front, a parallel bolt shaft portion 332 projecting from the front of the support plate 331, and a holding plate 333 mounted on the parallel bolt shaft portion 332. It is composed of a tightening nut 334.

In the connecting member 3a, a rear portion is inserted from the lower through hole B, the foot plate portion 32a is positioned behind the embedded sheet pile steel plate 01a, and the insertion rod 31a is placed on the foundation Y (FIG. 9a). The lower end of the support column 1 is inserted between the parallel bolt shaft portions 332, then the holding plate 333 is attached to the parallel bolt shaft portion 332, and the support column 1 is attached to the connecting member 3a by screwing and tightening the tightening nut 334. (Fig. 9b).

Therefore, the support column 1 is connected to the buried sheet pile steel plate 01a with less progress of corrosion, and the back hole C is filled with concrete (at the same time as the spraying work to be carried out later or the placing work in the case of the second embodiment, or in advance concrete. The support column 1 and the buried sheet pile plate 01a are integrated by casting).

Further, the connecting member 3b used in the fourth embodiment is composed of a member main body 31b, two bolt bodies 32b, a holding plate 33b, and a tightening nut 34b as shown in FIG. 7B.

The member main body 31b has an H shape, the rear side portion 311 is wider than the front side portion 312, and the vertical side portion 313 has a predetermined length corresponding to the standing position of the support column 1, and the rear side portion 311 has a predetermined length. A bolt mounting groove 314 is provided corresponding to the width of the support column 1, and the holding plate 33b is the same as the holding plate 333 described above.

When the connecting member 3b is used, the lower through hole B needs to be formed narrowly and at a depth including the buried sheet pile steel plate portion (reaching the bottom surface 02 or less of the irrigation canal). The member main body 31b is inserted into the lower through hole B in an upright state (FIG. 10a), and the member main body 31b is rotated 90 degrees with the front side portion 312 intruding into the back hole C so that the front side portion 312 is inserted. It is locked to both side edges (embedded sheet pile plate 01a) of the lower through hole B. In this state, the bolt body 32b is locked and mounted in the bolt mounting groove 314, the lower end of the support column 1 is inserted between the bolt bodies 32b, the holding plate 33b is mounted on the bolt body 32b, and the tightening nut 34b is screwed. By tightening, the support column 1 is attached to the connecting member 3b (FIG. 10b). The bolt body 32b may be integrally formed with the member body 31b in advance.

Therefore, as in the third embodiment described above, the support column 1 and the buried sheet pile plate 01a are integrated by filling the back hole C with concrete.

Further, as in the fifth embodiment shown in FIG. 11, the support block body 3c may be adopted as the connecting member. The support block body 3c is provided with a fitting groove 31c in the middle of the front and rear of the lower surface, and is provided with a rear leg portion 32c and a front leg portion 33c with the fitting groove 31c interposed therebetween, and is vertically penetrating from the upper surface surface to the fitting groove 31c. The hole portion 34c is provided, and the vertical hole portion 34c is provided in a size including a mounting portion for mounting the support column 1.

The support block body 3c is installed so as to straddle the lower through hole B with the support column 1 inserted through the vertical hole portion 34c and to abut the inner surface of the rear leg portion 32c on the back surface of the embedded sheet pile plate 01a. The upper end portion of the support column 1 is connected to the abdominal raising member 05, or is positioned in the drilling D and connected to the cap tree portion 04, and concrete is poured from the vertical hole portion 34c to form the buried sheet pile steel plate 01a and the support block body 3c. The gap between the two is filled with concrete 4, and the buried sheet pile plate 01a, the support block body 3c, and the support column 1 are integrated.

After completing the support support work, the bar arrangement work is performed. In the bar arrangement work, the horizontal core bar 2 is stretched on the support column 1, and the net core material 21 is further attached. The spraying work is performed after the bar arrangement work is completed, and the spraying work is performed by using the polymer cement mortar 7 or the fiber concrete 7a and using a predetermined spraying device, and appropriately finishing the iron. A covering retaining wall X is formed on the front surface of the sheet pile steel plate 1 by solidification of the polymer cement mortar 7 and the fiber concrete 7a, and the irrigation canal of the corroded sheet pile plate 01 is repaired.

Further, in the second embodiment, the upper end of the reinforcing bar (vertical main core bar) 1a is connected to the cap tree portion 04 and the abdominal raising member 05 by an appropriate means, and the lower end portion is a buried sheet pile, as in the case of the above-mentioned strut installation work. It is directly connected to the steel plate 01a or via the connecting members 3, 3a, 3b, 3c, assembled into the reinforcing bar cage 12 to reinforce the vertical main core bars, and further connected and horizontally laid horizontally to the reinforcing bar cage 12 as appropriate. Do rebar work.

After the reinforcement work is completed, the separator 8 is projected from the reinforcing bar cage 12 or the horizontal core bar 2 where the reinforcement is arranged, and the formwork Z is stretched around the formwork Z facing the reinforcement surface using the separator 8 to form the formwork Z. When the mortar 7 or the concrete 7a is placed between the sheet pile and the front surface of the sheet pile 01 and the formwork Z is removed after the concrete or the like is solidified, the covering retaining wall X is formed on the front surface of the sheet pile 01.

1 prop (vertical main core bar)
1a Reinforcing bar (vertical main core bar)
11 Bent part 12 Reinforcing bar cage 2 Horizontal core bar 21 Net core material 3 Connecting member 31 Connecting horizontal plate 32 Strut hole 33 Holding part 3a Connecting member 31a Insertion rod 32a Foot plate part 33a Strut mounting part 331 Support plate 332 Parallel bolt shaft part 333 Retaining plate 334 Tightening nut 34a Positioning bolt 3b Connecting member 31b Member body 311 Rear side part 312 Front side part 313 Vertical side part 314 Bolt mounting groove 32b Bolt body 33b Suppressing plate 34b Tightening nut 3c Support block body (connecting member)
31c Fitting groove 32c Rear leg 33c Front leg 34c Vertical hole 4 Concrete 5 Crushed stone 6 Foot steel 7 Mortar 7a Concrete 8 Separator A Front hole B Downward through hole C Back hole D Drilling hole E Front groove X Covered retaining wall Y Foundation Z formwork 01 sheet pile 01a buried sheet pile 02 bottom (ground)
03 Waterway 04 Kasagi part 05 Abdominal raising member 06 Beam member 07 Reinforcing bar

Claims (8)

In an existing irrigation canal in which a retaining wall is formed of sheet piles, this is a repair method in which the surface of the sheet piles is directly covered with mortar or concrete. The upper end of the streak is connected to the abdominal member or cap tree provided on the upper edge of the existing irrigation canal, and the lower end is connected to the buried sheet pile below the bottom of the irrigation canal to construct it upright. A method for repairing an existing irrigation canal, which comprises connecting a horizontal core bar, a net core material, or both, and then applying a mortar spraying work or a concrete spraying work to the core material to construct a covering retaining wall. In an existing irrigation canal in which a retaining wall is formed of sheet piles, this is a repair method in which the surface of the sheet piles is directly covered with mortar or concrete. The upper end of the streak is connected to the abdominal member or formwork provided on the upper edge of the existing irrigation canal, and the lower end is connected to the buried sheet pile below the bottom of the irrigation canal to construct it upright. After connecting the horizontal core bar, the mesh core material, or both, a formwork is placed in front of the core material, and mortar or concrete is placed between the sheet pile steel plate and the formwork to construct a covering retaining wall. A repair method for existing irrigation canals, which is characterized by this. The repair method for an existing irrigation canal according to claim 1 or 2, wherein the vertical main core bar is a support. The repair method for an existing irrigation canal according to claim 1 or 2, wherein the vertical main core bar is a reinforcing bar or a reinforcing bar cage. The repair method for an existing irrigation canal according to any one of claims 1 to 4, wherein the upper end of the vertical main core bar is connected and fixed to the exposed inner vertical surface of the raised member made of H steel by an appropriate means. The repair method for an existing irrigation canal according to any one of claims 1 to 4, wherein the upper end portion of the vertical main core bar is connected and fixed to the cap tree portion by mortar or concrete filled in a hole drilled in the cap tree portion. A lower through hole is provided in the sheet pile at the bottom of the existing irrigation canal, and a back hole is excavated on the back surface of the lower through hole to extend the back surface of the sheet pile to below the bottom of the irrigation canal. The method for repairing an existing irrigation canal according to any one of claims 1 to 6, which is connected to a sheet pile across the sheet. A lower through hole is provided in the sheet pile at the bottom of the existing irrigation canal, and a back hole is excavated on the back surface of the lower through hole to extend the back surface of the sheet pile to below the bottom of the irrigation canal. The repair method for an existing irrigation canal according to any one of claims 1 to 6, wherein the lower end portion of the vertical main core bar is connected to the connecting member to be stopped and connected.

Images