JP2010261163A - Structure and construction method for heaping up existing retaining wall in mountainous area - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent collapse of an existing retaining wall by imposing only a minimum load on the existing retaining wall, and to easily perform transportation and assembly of a material for use in heap-up by humans. <P>SOLUTION: (1) Divided column materials 21-23 divided into a plurality of portions are vertically connected together by means of a bolt in such a manner as to be juxtaposed along one surface of the existing retaining wall, and fixed to the one surface by anchoring, so that a plurality of columns 2 can be raised to a predetermined height above a crown height of the existing retaining wall. (2) A plurality of water sealing plates 3 are erected among the respective columns, joined together by welding, and elongated above the existing retaining wall. (3) A draining member 4 is provided between the existing retaining wall and each of the water sealing plates, so as to watertightly close a gap between them. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a raising structure and a construction method of an existing retaining wall in a mountainous area.

  In general, the height of the top of the retaining wall is set to a predetermined level or higher in order to prevent the river from overflowing. However, in areas that have experienced heavy rains due to recent extreme weather events or heavy typhoons, the water level of the river rises significantly, so the top of the retaining wall is relatively low. Therefore, in such an area, it is necessary to raise the top of the retaining wall as a countermeasure against flooding of rivers. FIG. 5 shows a conventional raising structure of an existing retaining wall. In general, when raising the existing retaining wall 7, the concrete 7 c is additionally placed on the top end 70 of the existing retaining wall 7 to raise the top end height of the existing retaining wall 7. FIG. 6 shows the work procedure of this raising work. As shown in FIG. 6, first, work scaffolds 91 are temporarily installed on both sides of the existing retaining wall 7 (step 1). Subsequently, an (adhesive) anchor 92 is driven into the top end of the retaining wall 7 (step 2), and the main reinforcement 93 and the distribution reinforcement 94 are arranged through the anchor 92 (step 3). And the formwork 95 is assembled according to the end of this top end, and concrete 71c is cast. The raising structure and construction method of the existing retaining wall by this type of cast-in-place concrete are pointed out in many documents such as Patent Documents 1 and 2, for example.

Japanese Patent Laid-Open No. 9-158219 (paragraphs 0002 and 0003 and FIG. 5) JP-A-7-207686 (paragraph 0003)

By the way, as a countermeasure against inundation of various facilities installed adjacent to rivers in mountainous areas, for example, a substation as shown in FIG. 1, the existing retaining wall constructed around the substation is raised as described above. If it tries to carry out using the raising structure and construction method of existing retaining wall, there are the following problems.
(1) A large load of concrete is applied to the existing retaining wall. If this burden is excessively large, the existing retaining wall may collapse.
(2) It is necessary to transport materials such as reinforcing bars, single pipes, and plywood, and other long objects. If there are obstacles in the transportation of long objects on the site, it will be difficult to carry the materials. In the case of a substation, there is a danger of electric shock if a long object comes in contact with the high-voltage line because the high-voltage line passes above the operator's head, and sufficient consideration must be given to the location and spacing of the high-voltage line. Only the work efficiency is reduced.
(3) The cast-in-place concrete method requires a lot of temporary materials, and the work on site is complicated and the construction period is prolonged. In the case of a substation, the work period is even longer because the working time is limited to daytime.
(4) Since a (pump) concrete is usually used for placing the (raw) concrete, it is necessary to secure a set space for the pressure feed pump and the ready-mixed car (a transport truck dedicated to ready-mixed concrete) on site. If it is difficult to secure the concrete, the concrete placement work will be difficult. Moreover, although a crane and a bucket may be used, it is the same also in this case. In the case of substations, as described above, work with a pressure pump or crane is very dangerous because the high-pressure line runs over the operator's head, requiring sufficient care, and the work efficiency decreases.
(5) When (raw) concrete is placed with piping, etc., the piping is clogged and the (piping) joint may be removed, but when this piping joint is removed, the river is soiled. The use of (raw) concrete is not preferred. In the case of a substation, if this pipe is handled too close to the high voltage line, there is a risk of electric shock, and sufficient caution is required, and work efficiency is reduced.
(5) When concrete placement is performed on an existing retaining wall adjacent to the river, the river may be soiled with so-called raw kon noro and remaining kon, and the use of (raw) concrete is not preferable.

  The present invention solves such conventional problems. In this type of mountain wall retaining wall raising structure and construction method, a minimum load is applied to the existing retaining wall, and the existing retaining wall collapses. , To transport materials used for raising and to assemble this material with human power, to reduce temporary construction materials as much as possible, to shorten the construction period, without using concrete, The purpose is to prevent river pollution, to be more economical than concrete structures, and to add a driftwood prevention function without impairing the overall appearance.

  In order to achieve the above object, the present invention provides a mountainous area that raises an existing retaining wall constructed to prevent flooding and flooding of the river around various facilities installed adjacent to a river in a mountainous area. In the raising structure of the existing retaining wall in the above, the divided retaining pillar material is vertically connected in parallel along one surface of the existing retaining wall and fixed to the one surface, and the existing retaining wall A plurality of columns that rise up to a predetermined height above the top end height, a plurality of water blocking plates that are constructed and joined between the columns and extend above the existing retaining wall, and the existing The gist of the present invention is that it is constituted by a draining member that is provided between the retaining wall and each of the water blocking plates and that tightly closes the gap between the two.

Moreover, in this structure, it is preferable to provide each part with the following configuration.
(1) Steel plates are used for the divided pillar materials, steel plates are used for the drainage members, these steel plates and steel plates are factory processed, plated, and a plurality of divided pillar materials are connected by bolts in the vertical direction. Fixed to one surface of the existing retaining wall by anchoring, the plurality of water stop plates are joined by welding between the columns, and the plurality of draining members are fixed to the top end of the existing retaining wall by anchoring, It joins to the lower end of each waterstop by welding.
(2) A driftwood prevention member is provided between the pillars on the river side and has a plurality of cross-sectional wedge shapes.
(3) An angle material is adopted as the driftwood prevention member, and a plurality of angle materials are factory processed, plated, and joined between the columns by welding.

  In order to achieve the above object, the present invention provides a mountainous area that raises an existing retaining wall constructed to prevent flooding and flooding of the river around various facilities installed adjacent to a river in a mountainous area. In the method of raising the existing retaining wall in the above, a plurality of pillars are formed by connecting a plurality of divided pillar materials in the vertical direction in parallel along one surface of the existing retaining wall and fixing them to the one surface. To a predetermined height above the top end height of the existing retaining wall, and by installing and joining a water stop plate between the pillars, a plurality of water stop plates are extended above the existing retaining wall. And a step of providing a draining member between the existing retaining wall and each water blocking plate to close the gap between the two in a watertight manner.

  Moreover, in this construction method, it is preferable to further include a step of constructing a driftwood prevention member having a wedge-shaped cross section between the columns on the river side.

In the raising structure of the retaining wall and the construction method in the mountainous area of the present invention, the following effects can be achieved by the above-described configurations and construction methods.
(1) Around existing facilities installed adjacent to rivers in mountainous areas, existing retaining walls constructed to prevent river flooding and in parallel along one outer surface of the retaining walls The divided pillar materials divided into a plurality of parts are connected in the vertical direction and fixed to the one surface, and the plurality of pillars are raised to a predetermined height above the height of the top of the existing retaining wall and stopped between these pillars. A water plate is installed and joined, and a plurality of water stop plates are extended above the existing retaining wall, and a water draining member is provided between the existing retaining wall and each water stop plate so that the gap between the two is sealed with water. Since it is structured to raise the retaining wall and stop running water in case of flooding the river, by using only the material that prevents running water, transportation and assembly work of materials can be done manually, Securely raise existing retaining walls even under working conditions where there is little work space and machines are difficult to use. It can, it is possible to shorten the construction period. In this case, H-shaped steel, water-stop plate is used for the split column material, iron plate is used for the draining member, H-shaped steel and steel plate are factory-processed, galvanized, and these materials are anchored and bolted on site Or since it is assembled by welding, the work of raising the existing retaining wall can be easily performed even at a site where a sufficient work space cannot be secured. Moreover, there exists an advantage suitable for the operation | work of a live line proximity distance because these materials are short things. In the case of substation construction, the access period in the substation is short and economical.
(2) With the structure assembled with pillars made of H-shaped steel, water stop plates made of iron plates, and draining members made of iron plates, it is possible to limit the existing retaining walls to a minimum and collapse the existing retaining walls. Can be reliably prevented.
(3) Since concrete is not used, it is possible to prevent the river from being polluted by concrete, which is also preferable as an environmental measure. Moreover, by not using concrete, it is more economical than concrete structures.
(4) Since a plurality of columns (divided column materials), a plurality of water blocking plates, and a plurality of draining members are sequentially assembled, the divided column materials can be used as a scaffold, and temporary materials are reduced as much as possible. The construction period can be shortened by reducing the amount of work.
(5) A driftwood prevention member with a wedge-shaped cross section is provided between the pillars on the river side, so this driftwood prevention member can stop the driftwood of the river and ensure the outflow of driftwood along with running water during river flooding Can be prevented.
(6) An angle material is used for the driftwood prevention member, this angle material is factory-processed, galvanized, and attached by welding between the pillars at the site, so this driftwood prevention member can be easily formed. Also, sufficient strength can be secured. In addition, since the driftwood prevention member is formed by arranging a plurality of angle members in parallel, it has a design effect and the appearance of the entire raised structure can be favorably maintained.

It was constructed to prevent flooding of rivers around various facilities (in this case, substations) installed adjacent to rivers in mountainous areas, which are exemplified to explain an embodiment of the present invention. Plan view of existing retaining wall Schematic sectional view of the existing retaining wall (sectional view taken along line AA in FIG. 1) Schematic sectional view showing the raised structure of the existing retaining wall in one embodiment of the present invention (A) Schematic front view of driftwood prevention member employed in the structure (b) Schematic side sectional view Schematic sectional view showing the conventional raised structure of existing retaining walls Explanatory drawing showing the conventional method for raising the existing retaining wall

  Next, embodiments for carrying out the present invention will be described with reference to the drawings. In this embodiment, as an example of a flooding countermeasure for a substation installed adjacent to a river in a mountainous area, an example of raising an existing retaining wall built around the substation is illustrated. As shown in FIG. 1, the substation 6 is installed adjacent to a river (main stream and tributary), and a (existing) retaining wall 7 is constructed around the substation 6. As shown in FIGS. 1 and 2, a substation facility 60 is installed in the substation 6, and a high voltage line 61 is passed above the substation facility 60, and the high voltage line 61 passes over the existing retaining wall 7. . This site has little working space, the river side has a working passage 8 with a width of only about 1.5 m on one side of the existing retaining wall 7, and the road 9 passes along the existing retaining wall 7 on the inland side. However, since the road 9 cannot be closed, the work space is extremely limited. In addition, the substation equipment 60 and the high voltage line 61 are energized, and the working distance of the hot wire adjacent to the substation equipment 60 and the high voltage line 61 is limited, so that the work space is further narrowed. In addition, working hours are limited to daytime only. At this site, there is no other way than going to the vicinity of the existing retaining wall 7 by human power, and the raising work of the existing retaining wall 7 is nothing but human power.

  FIG. 3 shows a raised structure of an existing retaining wall suitable for such a site. As shown in FIG. 3, the raised structure 1 is divided into a plurality of divided column members 21, 22, and 23 that are divided in parallel along a predetermined interval along one surface 71 on the outer side (river side) of the existing retaining wall 7. Are connected to one of the outer surfaces 71 of the existing retaining wall 7 and are raised to a predetermined height above the height of the top end 70 of the existing retaining wall 7. A plurality of water blocking plates 3, which are constructed and joined between the pillars 2,... And extend above the existing retaining wall 7, and are provided between the existing retaining wall 7 and each water blocking plate 3. And a drainage member 4 that tightly closes the gap between the two and a driftwood prevention member 5 that is constructed between the pillars 2... On the river side and has a plurality of wedge-shaped cross sections.

  H-shaped steel is adopted for the divided column members 21, 22, and 23, and the H-shaped steel is divided and formed. This H-shaped steel is factory processed and painted by galvanization. A plurality of divided column members 21, 22, and 23 made of H-shaped steel are stacked and connected in the vertical direction to form a single column 2. In this case, three divided column members 21, 22, and 23 are stacked in the vertical direction for each column 2 and assembled, and the three divided column members 21, 22, and 23 each have a contact plate 24 between the connecting ends. It is fixed and joined by a bolt 25 (see FIG. 4). The lower and middle divided column members 21 and 22 are supported and fixed to the outer surface 71 of the existing retaining wall 7 via a chemical (adhesive) anchor 26. In this way, the plurality of pillars 2,... Are on the outside of the existing retaining wall 7 (on the river side on one working path 8 on one side of the existing retaining wall 7) along the one outer surface 71 of the existing retaining wall 7. They are raised at a predetermined interval and supported and fixed to the one surface 71 by the anchor 26.

  The water stop plate 3 is an iron plate, and is formed in a size that can be installed between the columns 2... And can be closed between the upper ends of the columns 2 and the top end 70 of the existing retaining wall 7. The This iron plate is factory processed and painted by galvanization. This water stop plate 3 is aligned with each of the columns 2, 2 in accordance with the upper end position of the surface facing the existing retaining wall 7 of the two adjacent columns 2, 2 and the position corresponding to the top end 70 of the existing retaining wall 7. The water stop plate 3 and the columns 2 and 2 are joined by welding. In this way, a plurality of water stop plates 3,... Are attached between the plurality of pillars 2,..., And the top ends of the pillars 2,. Is blocked.

  The draining member 4 is made of an iron plate and has a size that can cover the top end 70 of the existing retaining wall 7 and close the gap between the top end 70 and the water stop plate 3. This iron plate is factory processed and painted by galvanization. The draining member 4 is laid on the top end 70 of the existing retaining wall 7 and fixed by an anchor, and the tip end (end on the river side) of the draining member 4 and the lower end of the water stop plate 3 are joined by welding. In this way, the plurality of draining members 4,... Are attached between the top end 70 of the existing retaining wall 7 and the plurality of water blocking plates 3,. The gap between the water plates 3 is closed watertight. These water draining members 4,... And the water stop plate 3,... May be joined with an angle member fixed by bolting between them, and the gap between them may be stopped by a water stop agent.

  The driftwood prevention member 5 is formed of an angle material, and a plurality of angle materials are formed in a length that can be laid between the columns 2... And are laid in parallel between the columns 2. This angle material is factory processed and painted by galvanization. As shown in FIG. 4, each of the plurality of angle members has its corners directed to the outside (river side), and the left and right ends are in contact with the surfaces of the two adjacent pillars 2 and 2 facing the river, Between each column 2 and 2, it is laid in parallel in the range from the upper end of each column 2, 2 to the position corresponding to the top end 70 of the existing retaining wall 7, and the corners of a plurality of angle members are cross-sectioned toward the river side It protrudes into a wedge shape. In this way, the plurality of driftwood prevention members 5,... Are attached between the plurality of columns 2,..., And the driftwood is stopped by the cross-sectional wedge shape of these driftwood prevention members 5,.

  The method for raising the existing retaining wall will be described with reference to FIG. First, necessary preparations are made before this construction method is performed. In this preparation, the actual measurement of the existing retaining wall 7 is carried out, and a layout drawing for arranging the column 2, that is, the H-shaped steel is created. At this stage, the weight of the pillar 2, that is, the H-shaped steel, is grasped, and the pillar 2 can be transported by human power, so that one pillar 2 is divided into a plurality of parts, in this case, divided into three parts, 22 and 23 determine to assemble. Each material of the pillar 2 (divided pillar material 21, 22, 23), the water stop plate 3, the draining member 4, and the driftwood prevention member 5 is processed at the factory, and each is coated (galvanized). Then, after marking the position and height of the pillar 2 and positioning the mounting anchor 26 at the site, the existing retaining wall is raised by the following method.

  In this construction method, the step of starting up the pillar 2, the step of attaching the water stop plate 3, the step of attaching the draining member 4, and the step of attaching the driftwood prevention member 5 are sequentially performed.

  First, in the step of starting up the pillar 2, a plurality of pillars 2,... Are arranged on the outside of the existing retaining wall 7 (on the river side is on the work path 8) along the one surface 71 on the outer side of the existing retaining wall 7. Set up in parallel at intervals. The column 2 is raised by connecting the divided column members (H-shaped steel) 21, 22, and 23 in the vertical direction with the abutment plate 24 and the bolts 25, and to the outer one surface 71 of the existing retaining wall 7. It fixes by anchor 26 stop, and each pillar 2, ... is raised to the predetermined height above the top end height of the existing retaining wall 7. In this case, the divided column members 21, 22, and 23 are transported using a small winch. First, the divided column material 21 serving as a lower column is installed at a predetermined position outside the existing retaining wall 7 (on the working passage 8), and the divided column material 21 is attached to the chemical (adhesive) anchor 26. It fixes to the outer side one surface 71 of the existing retaining wall 7 via. In order to secure a scaffold, the lower pillars are installed and fixed up to about half of the construction range. Subsequently, on these divided column members 21 (lower columns), the divided column members 22 serving as intermediate columns are connected and assembled by applying the abutment plates 24 between the respective connecting ends and fastening the bolts 25, The divided column material 22 is fixed to the outer surface 71 of the existing retaining wall 7 through a chemical (adhesive) anchor 26. Then, the divided column material 23 which is an upper column on these divided column materials 22 (intermediate column) is connected and assembled by applying the abutment plate 24 between the respective connecting ends and fastening the bolts 25.

  Next, in the attaching process of the water stop plate 3, a water stop plate (iron plate) 3,... The water stop plate 3 is attached at positions corresponding to the upper end position of the surface facing the existing retaining wall 7 of the two columns 2 and 2 adjacent to each other on the upper and lower sides of the water stop plate 3 and the top end 70 of the existing retaining wall 7. Accordingly, the water stop plate 3 is installed between the columns 2 and 2 and the water stop plate 2 and the columns 2 and 2 are joined by welding. In this case, distortion removal by welding is also performed. In this way, the plurality of water stop plates 3,... Are attached between the plurality of pillars 2... (In this case, the plurality of water stop plates 3,. The gap between the end 70 and the position is closed.), Extending above the existing retaining wall 7.

  Next, in the step of attaching the draining member 4, the draining member (iron plate) 4,... Is provided between the existing retaining wall 7 and each water stop plate 3. The draining member 4 is attached by laying the draining member 4 on the top end 70 of the existing retaining wall 7 and fixing the draining member 4 with an anchor. The tip of the draining member 4 (end on the river side) and the water stop plate 3 The lower end is joined by welding. In this case, distortion removal by welding is also performed. In this way, the plurality of draining members 4,... Are attached between the top end 70 of the existing retaining wall 7 and the plurality of water blocking plates 3,. The gap between each water stop plate 3,. In this process, the angle member is fixed with bolts between the water draining member and the water stop plate, the water drain member and the water stop plate are joined, and the gap between the two is stopped with the water stop agent. May be.

  Then, in the step of attaching the driftwood prevention member 5, the driftwood prevention member 5,... Having a wedge-shaped cross section is installed between the pillars 2,. The driftwood prevention member 5 is attached by bringing a plurality of angle members into contact with the surfaces of the two pillars 2 and 2 adjacent to each other with their corners facing outward and the two right and left ends facing each other. The two columns 2 and 2 are installed in parallel in the range from the upper ends of the columns 2 and 2 to a position corresponding to the top end 70 of the existing retaining wall 7 and joined by welding. In this way, the plurality of driftwood prevention members 5,... Are attached between the plurality of pillars 2,..., And the corners of the plurality of angle members are projected in a wedge shape in cross section toward the river side. To stop driftwood. Finally, necessary processing such as touch-up of the welding marks is performed, and this raising operation is completed.

As described above, according to the raised structure and method of the existing retaining wall, the following effects can be obtained.
(1) An existing retaining wall 7 constructed to prevent flooding and flooding of a river around a substation 6 installed adjacent to a river in a mountainous area. A plurality of divided column members 21, 22, and 23 are connected in parallel in the vertical direction by the abutment plate 24 and the bolts 25, and fixed to the one surface 71 by the chemical anchor 26, so that the plurality of columns 2 are raised to a predetermined height above the height of the top end of the existing retaining wall 7, and a water stop plate 3 is installed and joined between the pillars 2,. Is extended above the existing retaining wall 7, and a draining member 4 is provided between the existing retaining wall 7 and each of the water blocking plates 3,... A material that prevents the river from flowing because the retaining wall 7 is raised so that it stops flowing when the river overflows. With the use of only the material, the materials can be transported and assembled manually, and the existing retaining wall 7 can be reliably raised even under working conditions where the working space is small and the machine is difficult to use. Can be achieved. In particular, H-shaped steel is used for the divided pillar materials 21, 22, 23, and steel plates are used for the water stop plate 3 and the draining member 4, and the H-shaped steel and steel plate are processed at the factory and coated by galvanizing. Therefore, it is possible to easily raise the existing retaining wall even at a site where a sufficient work space cannot be secured. Moreover, there exists an advantage suitable for the operation | work of a live line proximity distance because these materials are short things. In the case of the construction of the substation 6, the access period in the substation 6 is short and economical.
(2) With the structure assembled by the pillar 2 made of H-shaped steel, the water stop plate 3 made of iron plate, and the draining member 4 made of iron plate, a minimum load can be applied to the existing retaining wall 7 The retaining wall 7 can be reliably prevented from collapsing.
(3) Since no concrete is used, the river can be prevented from being polluted by concrete, which is preferable as an environmental measure. Moreover, by not using concrete, it is more economical than concrete structures.
(4) Since the plurality of pillars 2 (divided pillar members 21, 22, 23), ..., the plurality of water blocking plates 3, ..., the plurality of draining members 4, ... are sequentially assembled, the divided pillar members 21, 22, 23 can be used as a scaffold, and the construction period can be shortened by the amount of temporary material reduced as much as possible.
(5) Since the driftwood prevention member 5 having a wedge-shaped cross section is provided between the pillars 2 on the river side, the driftwood prevention member 5 can stop the driftwood of the river, and the river flows when the river is inundated. At the same time, it is possible to reliably prevent outflow of driftwood.
(6) An angle material is used for the driftwood prevention member 5, this angle material is processed at the factory, galvanized, and a plurality of angle materials are attached on the spot by welding between the pillars 2,. The member 5 can be easily formed and sufficient strength can be secured. In addition, since the driftwood prevention member 5 is formed by arranging a plurality of angle members in parallel, it has a design effect and the appearance of the entire raised structure 1 can be maintained well.

DESCRIPTION OF SYMBOLS 1 Raised structure of existing retaining wall 2 Column 21, 22, 23 Divided column material 24 This plate 25 Bolt 26 Chemical anchor 3 Water stop plate 4 Drainage member 5 Driftwood prevention member 6 Substation 60 Substation equipment 61 High voltage line 7 Existing installation Wall 70 Top end 71 One side 8 Work passage 9 Road

Claims (6)

In the raising structure of the existing retaining wall in the mountainous area, which raises the existing retaining wall constructed to prevent flooding of the river around various facilities installed adjacent to the river in the mountainous area,
In parallel with one surface of the existing retaining wall, a plurality of divided column members are connected in the vertical direction and fixed to the one surface, and a predetermined height above the height of the top end of the existing retaining wall. With multiple pillars that can be raised to the height,
A plurality of water stop plates that are constructed and joined between the pillars and extend above the existing retaining wall;
The drainage member is provided between the existing retaining wall and each water stop plate and seals the gap between the two in a watertight manner.
The raised structure of the existing retaining wall in the mountainous area characterized by this.   Divided column material is steel plate, water stop plate, draining member is steel plate, these steel plate and steel plate are factory processed and plated, and multiple divided column materials are connected by bolts in the vertical direction and existing retaining wall Fixed to one surface of the wall by anchoring, the plurality of water blocking plates are joined by welding between the columns, and the plurality of draining members are fixed on the top end of the existing retaining wall by anchoring, The raising structure of the existing retaining wall in the mountainous region of Claim 1 joined to the lower end of a board by welding.   The raising structure of the existing retaining wall in the mountainous area of Claim 1 or 2 provided with the driftwood prevention member which is constructed between each pillar by the river side, and consists of several cross-sectional wedge shape.   4. The structure for raising an existing retaining wall in a mountainous area according to claim 3, wherein an angle material is employed as the driftwood prevention member, a plurality of angle materials are factory processed, plated, and joined between the columns by welding. In the method of raising the existing retaining wall in the mountainous area, which raises the existing retaining wall constructed to prevent flooding of the river around various facilities installed adjacent to the river in the mountainous area,
A plurality of pillars are connected in parallel along one surface of the existing retaining wall in a vertical direction and fixed to the one surface, so that a plurality of pillars are fixed to the top surface of the existing retaining wall. Starting up to a predetermined height above the height,
A step of laying and joining a water stop plate between the pillars, and extending a plurality of water stop plates above the existing retaining wall;
A step of providing a draining member between the existing retaining wall and each water blocking plate to close the gap between the two in a watertight manner;
Having
A method for raising an existing retaining wall in a mountainous area.   The method for raising an existing retaining wall in a mountainous area according to claim 5, further comprising a step of laying a driftwood prevention member having a wedge-shaped cross section between each pillar on the river side.

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