JPH0820942A - Method for continuously forming drainage wall in the ground and casing for placing plate drainage material - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for continuously forming a drainage wall in the ground and a casing for placing a plate-shaped drainage material, which enables efficient construction of a drainage wall having excellent drainage performance. [Structure] A casing 10 having guide members 12, 12 and a plate-shaped drainage member 20 are used, and one guide member 12 of the casing 10 is guided by an existing guide column 30 to bring the plate-shaped drainage members 20 closer to each other. Let me set it. Plate drainage material 2
A drainage wall 50 having continuity in drainage is constructed by group 0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously forming a drainage wall in the ground and a plate-like drainage material casting casing for various embankment structures such as bank bodies and soft ground.

[0002]

2. Description of the Related Art Generally, a dam body is threatened due to a decrease in infiltration performance over time and a drastic rise in the infiltration line inside the dam body due to a large amount of rainfall infiltration water during a typhoon. There are cases. In order to deal with such a situation, a method of excavating the inside of the dike and filling it with sand or crushed stone to form a drainage channel, a method of replacing the inside of the dike with good quality sand or crushed stone,
It is known to use a method of reinforcing a levee body using a drain material or the like alone or in combination.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The above-mentioned means for draining permeated water have the following problems. <B> In the method involving the excavation of the embankment, not only the safety of the embankment during the excavation work is threatened, but also mountain retaining work as a temporary embankment is required to ensure the safety, and the construction cost and The problem remains in terms of construction period. <B> Even with the reinforcement method using the drain material, there are problems in terms of construction cost, workability, and effectiveness of the reinforcement effect, and it is desired to propose a technique for improvement.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for continuously forming a drainage wall in the ground and a casing for placing a plate-like drainage material. To provide. A method of continuously forming a drainage wall with excellent drainage performance in the ground. A method of continuously forming drainage walls in the ground with excellent workability. An economical method that continuously forms drainage walls in the ground. Casing for driving plate-shaped drainage materials that can be used to accurately drive plate-shaped drainage materials

[0005]

The present invention is a method for continuously constructing a drainage wall in the ground, characterized by placing a plurality of plate-shaped drainage materials in close proximity to each other. This is a method of continuously forming drainage walls inside. Furthermore, the present invention is a method for continuously constructing a drainage wall in the ground, in which a plate-shaped drainage material is placed close to an existing plate-shaped drainage material together with a casing having guide members at both ends, and the casing The guide pillar connected to one of the guide materials is penetrated into the ground, the casing is removed, the guide pillar and the plate-shaped drainage material are left in the ground, and the placement position of the plate-shaped drainage material is moved. Repeat the steps to guide the other guide material of the casing to the existing guide column when placing the casing, and when removing the casing, connect the existing guide column to the other guide material of the casing. It is a method of continuously forming a drainage wall in the ground, which is characterized in that the drainage wall is extracted. Furthermore, the present invention is a method for continuously constructing a drainage wall in the ground, in which a plurality of plate-shaped drainage materials are placed in close proximity to each other, and water permeability is provided between the plate-shaped drainage materials. It is a method for continuously forming a drainage wall in the ground, which is characterized in that a perforated cylinder filled with the granular material is positioned. Furthermore, the present invention is a method for continuously constructing a drainage wall in the ground, in which a plate-shaped drainage material is cast close to an existing plate-shaped drainage material together with a casing having guide members at both ends,
A drain guide tube having a perforated structure is located between the plate-like drainage material and the plate-like drainage material, and the casing is extracted to leave the plate-like drainage material and the drain guide tube in the ground. This is a method of continuously forming drainage walls inside. Furthermore, the present invention is a method for forming a drainage wall in the ground, characterized by arranging a plurality of plate-shaped drainage materials along the transverse direction of the bank. Furthermore, the present invention is a casing for placing a plate-shaped drainage material in which the plate-shaped drainage material is inserted and placed in the ground. A plate-shaped drainage material placing casing comprising guide members provided at both ends and engageable with a rod-shaped guide member placed adjacent to a plate-like drainage material in the ground.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. <a> Drainage material casting casing FIG. 1 shows an example of the drainage material casting casing 10 (hereinafter referred to as “casing 10”). The casing 10 is a cylindrical body that is open at the top and bottom for placing the drainage material 20 in the ground while protecting it, and has a pair of protection plates 11 facing each other.
11 and the guide members 12, 12 having U-shaped cross sections provided at both ends of the protective plates 11, 11, and a space 13 into which the plate-shaped drainage material 20 can be inserted is formed therein. A plurality of pin holes 14 are formed in the upper portion of each guide member 12, 12, and the casing 10 is inserted into or removed from the casing 10 by inserting or removing a connecting pin 32 together with a pin hole 31 of a guide column 30 described later. It can be attached to and detached from 30.

<B> Plate-shaped drainage material The plate-shaped drainage material 20 is a plate material in which both surfaces of a plate-shaped core body 21 are covered with water-permeable membranes 22 and which has drainability in all directions. Both sides of a resin plate having holes are embossed, and the water permeable membrane 22 is made of, for example, a nonwoven fabric. The plate-shaped drainage material 20 is wound on a drum,
For example, it is used by being placed on the leader of a heavy machine such as a pile driving vibrator so that it can be pulled out freely.

<C> Guide Column The guide column 30 is a member for guiding the installed position of the casing 10, and for example, H-section steel can be used. In this embodiment, a case where the guide member 12 of the casing 10 is slid on the guide pillar 30 is described.
Of course, the guide pillar 30 may be internally provided. Further, in this case, as the guide column 30, not only H-section steel but also box steel can be used. Further, the guide pillar 30 does not need to have the driving length of the plate-shaped drainage material 20, but may have a penetration length such that the guide pillar 30 does not wobble when the casing 10 is driven.

[0009]

[Operation] Next, a method for constructing the drainage wall will be described. <A> Preparation for driving Fig. 2 (A) is a view of the construction site viewed from above, and is designated by reference numeral 20.
Reference numeral a is a plate-shaped drainage material that is placed in the ground, and 30a is a guide column that is placed close to the end of the plate-shaped drainage material 20a on the extension side. The casing 10 is hung on a heavy machine (not shown), and the starting end portion of the plate-shaped drainage material 20 is inserted and fixed to the casing 10 from the upper part to the lower part. Plate drainage material 2
As a fixing method of 0, a method of attaching a lid member (not shown) that closes the lower opening of the casing 10 and can be locked to the plate-shaped drainage material 20 drawn out below the casing 10 can be considered. Further, as shown in FIG. 1, the guide column 30b is integrally connected to the guide member 12 on the right side of the casing 10 in the drawing via the connecting pin 32.

<B> Step for placing plate drainage material Then, as shown in FIG. 2B, the plate drainage material 20b is driven up to a predetermined depth by applying vibration or pressure input to the casing 10. At this time, the guide material 12 on the left side of the casing 10 in the drawing is guided by the existing guide columns 30a to drive the plate-shaped drainage material 20b at an accurate position. In addition, plate-shaped drainage material 2
Guide pillar 30 that is integrated with casing 10 when driving 0b
b is also penetrated into the ground at the same time.

<C> Casing Extraction Step Next, as shown in FIG. 2C, the connection between the guide member 12 and the guide column 30b on the right side of the casing 10 in the drawing is released and the casing 10 is drawn. Left guide material 1
2 and the existing guide pillar 30a are connected by a connecting pin 32. Then, a pulling force is applied to the casing 10 to pull out the guide pillar 30a on the left side of the drawing together with the casing 10,
As shown in FIG. 2D, the plate-shaped drainage material 20 and the guide columns 30b are left in the ground.

<D> Cutting process of plate-shaped drainage material When the casing 10 is pulled up to the ground, the plate-shaped drainage material 2
0 was cut at the lower position of the casing 10 and described above.
Similarly to the above, the lid member is attached to the plate-shaped drainage material 20 protruding from the inside of the casing 10, and the guide pillar 30 is removed.
a is a guide member 12 from the left side to the right side of the casing 10 in the drawing.
Change to. While repeating the above steps, the plate-shaped drainage material 20 is sequentially placed along the construction direction of the drainage wall.
In addition, the casing 10 is hung down so that the casing 1 can be inverted.
When the removal of 0 is completed and the casing 10 is inverted about the vertical axis, the work of replacing the guide column 30 on the ground after the removal can be omitted.

<E> Function of drainage wall FIGS. 3 and 4 show an example of the formation of a drainage wall 50 composed of a plurality of plate-shaped drainage materials 20. The drainage wall 50 constructed inside the bank is a bank body 40. Vertical wall 5 formed in the vertical direction of
1 and a transverse wall 52, one of which is connected to the longitudinal wall 51 and is formed in the transverse direction of the bank 40.
In the figure, reference numeral 41 is a drain pipe arranged at the skirt of the bank 40. Since each plate-shaped drainage material 20 has a short drainage interval,
Each wall 51, 52 has continuity in terms of drainage. In this way, the permeated water is effectively drained to the inside of the bank through the drainage wall 50 provided inside the bank 40. As a result, the infiltration line L1 before providing the drainage wall 50 descends to the position of the infiltration line L2.
Further, since the pore water in the bank 40 is dissipated through the drainage wall 50, the stability of the bank 40 is ensured. Generally, in the drain method, it was essential to embed the drain material at an appropriate interval in the ground and apply a load to the ground in which the drain material was embedded. In the present invention, the drainage wall 50 is formed by placing the plate-shaped drainage materials 20 in close proximity to each other.
It is possible to provide the drainage property in the vertical and horizontal directions. Moreover, since it functions as a drainage channel without applying a load to the plate-shaped drainage material 20, the drainage principle is completely different from the conventional drainage method. Further, unlike the excavation method, it does not require excavation or mountain retaining work, and only requires the work of placing the plate-shaped drainage material 20 in the ground, which is superior in workability to the excavation method. It should be noted that the formation range and the formation direction of the drainage wall 50 are appropriately selected in consideration of the drainage target object and the drainage direction. Further, the drainage wall 50 may be composed of only the transverse wall 52.

[0014]

[Embodiment 2] FIGS. 5 to 7 show another embodiment in which the water permeability between adjacent plate-shaped drainage members 20 is improved.

<A> Configuration [Casing] FIG. 5 shows a casing 6 used in this embodiment.
Indicates 0. The casing 60 of the present embodiment is a member that is placed in the ground while protecting the plate-shaped drainage material 20 (not shown), and the space 62 in which the plate-shaped drainage material 20 can be inserted into the tubular body 61.
And that the guide members 63, 63 are provided at both ends of the tubular body 61.
However, in this embodiment, the cross-sectional shape of the guide members 63, 63 is curved in an arc shape so as to accommodate the drain guide cylinder 70. Different from Example 1. That is, the casing 60 is configured by fixing the curved guide members 63, 63 to the short side surface of the tubular body 61 having a rectangular cross section.

[Drain guide cylinder] The drain guide cylinder 70 has a function of guiding when the casing 60 is placed, and a function of increasing the water permeability of the ground left between the plate-shaped drainage materials 20 while remaining in the ground. It is composed of a tubular body having a large number of openings 71 on its peripheral surface, and a lid 72 is provided at the bottom of the tubular body so as to prevent the invasion of earth and sand when it is inserted into the ground.
It can be closed by attaching. Further, the drain guide cylinder 70 has a length substantially equal to that of the plate-shaped drainage material 20 to be placed.

<B> Method for constructing drainage wall FIG. 6 is a plan view showing a method for constructing a drainage wall.
Reference numeral 20a denotes a plate-shaped drainage material that has been cast in advance, and 70a denotes a drain that is pressed into the ground by approaching the plate-shaped drainage material 20a and is filled with water-permeable particles 73 such as sand and gravel. It is a guide tube. Then, as shown in FIG. 6B, the casing 60, in which the starting end of the plate-shaped drainage material 20b is inserted and fixed, is driven into the ground by applying vibration or a pressure input. At this time, the guide material 63 on the left side of the casing 60 in the drawing is exteriorly mounted on the existing drain guide cylinder 70a, and the plate-shaped drainage material 20b is driven into the ground using the drain guide cylinder 70a as a guide material. Further, in parallel with the penetration work of the casing 60, a separate drain guide cylinder 70b with the bottom closed is inserted into the guide member 63 on the right side of the drawing and driven into the ground. Plate drainage material 2
When 0b is driven to a predetermined depth, only the casing 60 is extracted, and the plate-shaped drainage material 20b and the drain guide cylinder 70b are left in the ground as shown in FIG. 6 (C). Then, the particles 73 are filled in the drain guide cylinder 70b left in the ground. After removing the casing 60, the plate-shaped drainage material 2
Cut off 0. The above steps are repeated to construct a predetermined continuous drainage wall.

<C> Effect In the present embodiment, as shown in FIG.
7 having water permeability, which is located between the plate and the drainage material 20
Since the drain guide cylinder 70 filled with No. 3 has high water permeability, the drainage performance of the drainage wall is further improved.

[0019]

[Embodiment 3] FIG. 8 is a plan view of a drainage wall 50 having another shape. FIG. 8A shows an example in which a vertical wall 51 and a transverse wall 52 are arranged in a V shape and connected. FIG. 8B shows an example in which a plurality of transverse walls 52 are arranged at regular intervals in a direction orthogonal to the vertical walls 51, and branch walls 53 are branched from the transverse walls 52 and connected.

[0020]

[Embodiment 4] The case where the drainage wall 50 is applied to the dam body has been described above. However, if the drainage wall 50 is continuously constructed in the shape of a ring or a girder around the structure, it is also used as a measure for preventing liquefaction of the ground against an earthquake. it can. Further, if the drainage wall 50 is provided in the ground below the water-permeable pavement having a rainwater infiltration function, it can be used as a rainwater infiltration facility. Furthermore,
It can also be used to correct the flow direction of a groundwater vein. Furthermore, after constructing the drainage wall 50 at the sloping portion of the existing dam body 40, the upper part of the existing dam body 40 can be raised by embankment to construct a large-scale embankment.

[0021]

Since the present invention is as described above, the following effects can be obtained. <B> Since plate-shaped drainage materials can be placed close to each other,
Compared with the conventional drainage method, the drainage performance of the plate-shaped drainage material group is improved, and a drainage wall with high drainage performance can be obtained. <B> When the drain guide tube filled with sand is located between the plate-shaped drainage materials, the water permeability between the plate-shaped drainage materials is higher, and the drainage performance of the drainage wall is further improved. . <C> Since the plate-shaped drainage material is simply placed in close proximity, the workability is superior to that of the open-cut method. <D> Since the casing can be penetrated into the ground by using the guide column or the drain guide cylinder that has been penetrated into the ground as a guide member in advance, it is possible to drive the plate-shaped drainage material with high accuracy. <E> The drainage performance can be improved without significantly deforming the existing dam body.

[Brief description of drawings]

FIG. 1 is a perspective view of a casing according to a first embodiment.

FIG. 2 is an explanatory diagram of a drainage wall construction method according to the first embodiment.

[Fig. 3] Cross-sectional view of a levee body with a drainage wall formed inside the levee body.

4 is a plan view of FIG.

FIG. 5 is an explanatory diagram of a second embodiment using a drain guide cylinder.

FIG. 6 is an explanatory diagram of a drainage wall construction method according to a second embodiment.

FIG. 7 is a cross-sectional view of the adjacent portion of the plate-shaped drainage material with the drain guide tube interposed.

FIG. 8 is a model plan view showing an example of the shape of a drainage wall.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location E21B 7/20

Claims (6)

[Claims] 1. A method for continuously constructing a drainage wall in the ground, characterized in that a plurality of plate-shaped drainage materials are placed close to each other, and the drainage wall is continuously formed in the ground. how to. 2. A method of continuously constructing a drainage wall in the ground, in which a plate-shaped drainage material is cast close to an existing plate-shaped drainage material together with a casing having guide members at both ends, and the casing is also provided. The guide pillar connected to one of the guide materials is penetrated into the ground, the casing is removed, the guide pillar and the plate drainage material are left in the ground, and the placement position of the plate drainage material is moved. Each step is repeated, and when the casing is cast, the other guide material of the casing is guided by being guided to the existing guide pillar, and when the casing is removed, the existing guide pillar is attached to the other guide material of the casing. A method of continuously forming drainage walls in the ground, which is characterized by connecting and extracting. 3. A method of continuously constructing a drainage wall in the ground, in which a plurality of plate-shaped drainage materials are placed close to each other, and water permeability is provided between the plate-shaped drainage materials. A method for continuously forming a drainage wall in the ground, which comprises locating a perforated cylinder filled with particles having 4. A method for continuously constructing a drainage wall in the ground, in which a plate-shaped drainage material is cast close to an existing plate-shaped drainage material together with a casing having guide members at both ends, and the plate-shaped drainage material is formed. A drain guide tube having a perforated structure is located between the drainage material and the plate-like drainage material, and the casing is removed to leave the plate-like drainage material and the drain guide tube in the ground. A method of continuously forming walls. 5. The method for continuously forming a drainage wall in the ground according to any one of claims 1 to 4, characterized in that a plurality of plate-shaped drainage materials are arranged along the transverse direction of the bank. . 6. A plate-shaped drainage material placing casing in which a plate-shaped drainage material is inserted and placed in the ground, and a tubular body having a cross-sectional shape of the plate-like drainage material and having an open top and bottom, and the tubular body. A plate-like drainage material casting casing, characterized in that it is provided with guide members that are provided at both ends of the plate-like guide member and that are engaged adjacent to the plate-like drainage material in the ground.