JP2010150821A - Method for reinforcing retaining wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for reinforcing a retaining wall, which can stabilize the retaining wall by securing a drainage function of the retaining wall and reinforcing ground by a simple construction method. <P>SOLUTION: A drain pipe 7, which has many holes in the longitudinal direction, with one end formed as an opened end and the other end as a closed end is provided. The drain pipe is inserted and driven into the ground 6 from a weep hole 3, and the ground 6 is compacted, while the drain pipe 7 is anchored so that groundwater can be discharged from the opening end of the drain pipe 7. Additionally, when the weep hole 3 is put into a closed or approximately closed state, the drain pipe 7 is inserted and driven into the ground 6 from the weep hole 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for reinforcing a retaining wall provided with at least one drain hole.

  In order to stabilize artificial slopes such as embankments and cuts, and natural slopes, retaining walls are provided on the slope surfaces. And if groundwater rises due to earthquakes, heavy rain, etc., it is necessary to drain the ground, so it is common to provide a drainage hole in the retaining wall.

  By the way, if this drainage hole is blocked by earth and sand over the years after construction, or if it is blocked by backfill concrete behind the drainage hole, the groundwater behind the retaining wall will not be drained sufficiently, The function may be reduced and the retaining wall may collapse or collapse.

  As a means for recovering the drainage function of such a drain hole, there is a method of cleaning the inside of the drain hole or forming a new drain hole in the retaining wall.

  For example, in Patent Document 1, the joint of the outer surface body of the masonry retaining wall including the assembled outer surface body and the inner surface body on the back side is closed with a sealing material, and the distance between the inner surface body from the surface side of the outer surface body is closed. A sealing step of providing an injection port for injecting a grout material, an injection step of injecting the grout material from the injection port, and a place where the grout material is injected from the surface side after the grout material is solidified There has been proposed a technique having a core removing step of removing the core and a drainage portion forming step of installing a water filter body on the trace of the core being removed.

  In Patent Document 1, a cylindrical tube such as a PVC pipe is inserted into a joint, and a sealing material is set around the periphery of the molded tube. After that, the cylindrical tube is pulled out to form a grout injection port. And after grout material is inject | poured from an injection port and this grout material solidifies, the core of the place where grout material is inject | poured is extracted, and a perforated pipe is installed in the trace which pulled the core after that, and a drainage part ( Water drain hole).

  Further, in Patent Document 2, a plurality of anchors whose tip side is fixed in the ground and the head side is fixed to the slope surface are cut and reinforced by embedding them in slope ground such as embankment slope and retaining wall. In the slope stabilization method, the anchor includes a hollow tube body having a large number of through water collecting holes and a water-permeable drainage material provided on the outer periphery of a portion other than the fixing portion on the tip side of the hollow tube body. The hollow tube body is placed in a natural ground so that the tip side is located above the head side, and groundwater in the natural ground is introduced into the hollow tubular body through the drainage material and the water collecting hole. A slope stabilization method has been proposed in which after taking in, the hollow pipe body is allowed to flow down and discharged to the outside.

  In Patent Document 2, a hole is formed in the ground from the surface of the slope, and a hollow tube is inserted into the hole. An injection pipe for injecting a grout material is inserted into the hollow tube body, and the grout material is injected from the injection pipe between the outer periphery of the hollow tube body and the inner peripheral surface of the ground hole. The grout material is filled and hardened, and the tip of the hollow tube is fixed in the ground.

JP 2000-355949 A Japanese Patent Laid-Open No. 2001-152459

  However, in Patent Document 1, an inlet for injecting the grout material is provided, the grout material is injected into the inlet, then the core is removed, and then the water filter body is installed on the trace where the core is removed. There is a problem that the construction method is complicated and the cost of the installation work is also expensive.

  Moreover, since patent document 2 must form a drilling hole beforehand using a boring machine etc. prior to forming a drain hole, and since the hollow tube is fixed with a grout material, Similar to Patent Document 1, there is a problem that the construction method is complicated and the cost of installation work is expensive.

  The present invention has been made in view of such circumstances, and it is possible to reinforce the retaining wall by securing the drainage function of the retaining wall with a simple construction method and reinforcing the ground, thereby stabilizing the retaining wall. The purpose is to provide a method of construction.

  In order to achieve the above object, the retaining wall reinforcing method according to the present invention is a retaining wall reinforcing method in which at least one drain hole is provided, and has a number of holes in the longitudinal direction. A tubular member having a closed portion formed so that the other end is closed and the other end is closed, and the tubular member is inserted into the ground through the drain hole, and the ground is compacted. The tubular member is fixed so that groundwater can be drained from the open end of the tubular member.

  Further, the retaining wall reinforcing method of the present invention is characterized in that when the drain hole is in a closed state or a substantially closed state, the tubular member is inserted into the ground from the drain hole. .

  In the retaining wall reinforcing method of the present invention, the tubular member is arranged along the top end of the retaining wall, and is placed from the top end into the ground, and the tubular member is placed on the retaining wall. It is characterized by fixing.

  According to the retaining wall reinforcing method, the tubular member having a plurality of holes in the longitudinal direction and having a closed portion formed so that one end is an open end and the other end is closed is provided. Since the member is inserted into the ground from the drain hole and placed, the ground is compacted, and the tubular member is fixed so that groundwater can be drained from the open end of the tubular member. It will also penetrate into the ground behind the retaining wall, and the ground will be compacted by the shear resistance of the tubular member and the placement on the ground, and it is possible to improve the stability of the ground behind the retaining wall Become.

  In addition, when the drainage hole is in a closed state or substantially closed state, the tubular member is inserted / placed into the ground from the drainage hole, so that the drainage hole is formed with backfill concrete or earth and sand of the retaining wall. Even in the closed state or substantially closed state, the drainage hole can be penetrated by inserting the tubular member, and the drainage function can be easily recovered. In particular, since the tubular member penetrates into the ground and is fixed, the drainage function is improved as compared with the case where a drain hole is simply formed in the retaining wall. Moreover, it is not necessary to drill a hole using a large machine such as a boring machine, the construction space is small, the construction work is simple, and the construction cost is low.

  Further, the tubular member is arranged along the top end of the retaining wall and is placed in the ground, and the tubular member is fixed to the retaining wall, so that the tubular member and the retaining wall fixed to the ground are provided. Forms an integral structure, which can effectively prevent the retaining wall from overturning.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing an embodiment (first embodiment) of a reinforcing structure using a retaining wall reinforcing method according to the present invention.

  Reference numeral 1 denotes a stone masonry retaining wall as a retaining wall. The stone masonry retaining wall 1 is formed by assembling a large number of stones 2. In addition, a large number of drain holes 3 are provided at predetermined intervals in the vertical and horizontal directions on the slope side of the stone retaining wall 1.

  Further, a backfill concrete portion 4 is formed on the back surface of the stone retaining wall 1, a backfill crushed stone portion 5 is formed on the back surface of the backfill concrete portion 4, and a ground 6 is formed on the back surface of the backfill crushed stone portion 5. Is arranged.

  A drain pipe (tubular member) 7 is inserted into each drain hole 3..., And the tip penetrates into the ground 6.

  2A and 2B are views showing the appearance of the drain pipe 7. FIG. 2A is a front view, and FIG. 2B is a view taken along the line XX in FIG.

  As shown in FIG. 2, the drain pipe 7 has a large number of holes 8 extending in the longitudinal direction. In the present embodiment, the holes 8 are formed in a long hole shape and are arranged in a staggered pattern in the circumferential direction. Further, the drain pipe 7 has a closed portion 9 whose one end is crushed into a flat plate shape and closed in a substantially sharp shape. The closing portion 9 is not particularly limited as long as it has a shape that provides a compaction effect by placing, and for example, it is preferably formed in a conical shape or the like.

  As described above, in this retaining wall reinforcement method, the drain pipe 7 is also penetrated into the ground 6 on the back surface of the stone retaining wall 1, and the shear resistance of the drain pipe 7 or the placement on the ground 6 The ground 6 is compacted, and the stability of the ground 6 behind the stone retaining wall 1 can be improved.

  The present invention is particularly useful when the drain holes 3 are closed or substantially closed.

  That is, as described in the section of “Background Art”, the drainage holes 3 are blocked by earth and sand after the construction, or the concrete of the backfilled concrete portion 4 on the back of the drainage holes 3. If it is blocked by the groundwater, the groundwater that has risen in the ground 6 cannot be sufficiently drained, and the drainage function may be lowered.

  However, in the present invention, even if the drainage hole 3 is in a closed state or a substantially closed state, the drainage pipe 7 is inserted into the ground from the drainage hole 3 and placed. The hole 3 can be penetrated, and the drainage function can be easily recovered. In particular, since the drain pipe 7 penetrates into the ground 6 and is fixed, the drainage function is improved as compared with the case where the drain hole 3 is simply formed in the retaining wall 1. Moreover, it is not necessary to drill a hole using a large machine such as a boring machine, the construction space is small, the construction work is simple, and the construction cost is low.

  FIG. 3 is a cross-sectional view schematically showing a second embodiment of the retaining wall reinforcing method, and FIG. 4 is a view taken in the direction of arrow A in FIG.

  That is, in this second embodiment, an appropriate number of drain pipes 7 'are arranged along the top end 1a of the masonry retaining wall 1 and placed in the ground 6 from the top end 1a. The drain pipe 7 ′ is fixed to the top end 1 a of the masonry retaining wall 1 with the metal fitting 10 and the bolt 11 so that the wall 1 and the drain pipe 7 ′ are integrated.

  In this second embodiment, the drainage pipe 7 ′ is embedded in the ground 6 and integrated with the stone masonry retaining wall 1 via the metal fitting 10 and the bolt 11, so that the masonry retaining wall 1 falls over. Can be effectively prevented.

  When long drainage pipes 7 and 7 'are required, the drainage pipes are connected to each other through a joint member having a convex spiral portion, and the connected drainage pipes are placed on the ground. It is also preferable.

  Fig.5 (a) shows the principal part front view of the drainage pipe for connection, FIG.5 (b) is a ZZ arrow line view of Fig.5 (a).

  That is, as shown in FIG. 5, the drain pipes 7 and 7 ′ have a plurality of concave spiral portions 13 engraved by pressing at a predetermined interval on the outer periphery in the vicinity of the open end 12.

  FIG. 6 is a front view of the joint member. The joint member 14 is formed in a tubular shape so as to be fitted to the drain pipes 7 and 7 ′, and a convex spiral portion 15 is formed on the outer periphery thereof. It is formed by pressing.

  In the drainage pipes 7 and 7 'and the joint member 14 thus configured, the convex spiral portion 15 of the joint member 14 is screwed into the concave spiral portion 16 of one drainage pipe 7 and 7' to After fitting one drainage pipe 7, 7 'to the joint member 14, the concave spiral portion 16 of the other drainage pipe 7, 7' and the convex spiral portion 15 of the joint member 14 are screwed together, and the other The drainage pipes 7 and 7 'are externally fitted to the joint member 14, whereby a long drainage pipe can be obtained.

  Needless to say, the present invention is not limited to the above-described embodiment, and can be changed without departing from the scope of the invention. For example, as for the number of drainage pipes 7 inserted / placed from the drainage hole 3, in addition to the recovery of the drainage function and the reinforcement of the masonry retaining wall 1, a large number of drainage pipes 7 are provided over a plurality of stages. It is preferable to insert / pipe the drainage pipe 7, but if you want to restore only the drainage function, simply insert / pipe the drainage pipe 7 into the drainage hole 3 at the bottom of the masonry retaining wall 1 It is possible to achieve the purpose of the period.

  As described above, according to the present invention, according to the construction site and purpose, without requiring a large-scale construction, a desired number of drainage pipes 7 can be inserted and driven through the drainage holes 3 to the stone retaining wall 1. Desired reinforcement can be performed.

  Moreover, in the said embodiment, although the case of the stone masonry retaining wall was shown as a retaining wall, the kind of retaining wall is not limited, The same also applies to a reinforced concrete retaining wall, a block masonry retaining wall, and the like.

It is sectional drawing which shows typically one Embodiment (1st Embodiment) of the reinforcement structure using the reinforcement construction method of the retaining wall which concerns on this invention. It is the figure which showed the external appearance of the drain pipe, Fig.2 (a) is a front view, FIG.2 (b) is a XX arrow line view of Fig.2 (a). It is sectional drawing which shows typically 2nd Embodiment of the reinforcement structure using the reinforcement construction method of the retaining wall which concerns on this invention. It is A arrow directional view of FIG. It is a figure which shows an example of the open end of a drain pipe, Comprising: Fig.5 (a) is a front view, FIG.5 (b) is a ZZ arrow line view of Fig.5 (a). It is a front view which shows an example of a coupling member.

Explanation of symbols

3 Drain hole 6 Ground 7 Drain pipe (tubular member)
8 holes

Claims (3)

A retaining wall reinforcement method provided with at least one drain hole,
A tubular member having a large number of holes in the longitudinal direction and having a closed portion formed so that one end becomes an open end and the other end is closed,
The tubular member is inserted into the ground through the drainage hole and placed, the ground is compacted, and the tubular member is fixed so that groundwater can be drained from the open end of the tubular member. Retaining method of retaining wall.   2. The retaining wall reinforcing method according to claim 1, wherein when the drain hole is in a closed state or a substantially closed state, the tubular member is inserted into the ground through the drain hole.   The tubular member is arranged along the top end of the retaining wall, and is placed in the ground from the top end, and the tubular member is fixed to the retaining wall. Item 3. Reinforcement method for retaining wall according to Item 2.

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