JP2501164Y2 - Drain board - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain board used for ground improvement.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional drain board. Water-permeable sheets (7) and (7) are attached to both sides of the synthetic resin board body (6) having a corrugated cross section, and the groove (6
A water passage (62) is formed between 1) and the water permeable sheet (7). The drain board is driven into the ground by the driving machine (5) shown in FIG. The placing machine (5) comprises a casing (52) on a machine base (51), a driving device (53) for driving the casing (52) into the ground, and a drain board winding drum (1a).
(Fig. 2A). Drain board (1) pulled out from the drum (1a)
Through the casing (52) from the upper end of the casing (52) to protrude from the lower end, and the anchor (2) is attached to the protruding end.
Drive the casing (52) into the ground (Fig. 2B). casing
When the lower end of (52) reaches a predetermined depth, the casing (52) is pulled up. Drain board (1) has anchors (2) at the bottom
The casing stays in the ground due to the pulling resistance caused by
Only (52) is pulled up (Fig. 2C). Drain board (1)
Is cut from the surface of the ground by about 10 to 20 cm, and the drain board (1) is sequentially placed on the ground by the same procedure as above.

[0003]

[Problems to be solved by the invention] It is known that liquefaction of loose saturated sand due to an earthquake or the like causes a great deal of damage. It can be discharged to the outside. One of the means for this is to place a large drain board in advance. The drain board could be wound if the total thickness of the board was about 10 mm. As described above, the thick drain board could not be wound. Therefore, a large drain board having a total thickness of more than 10 mm must be cut into a predetermined length and transported to the construction site. Further, this drain board cannot be continuously paid out from the casing (52), and the casing is rebuilt every time the drain board is placed on the ground.
There was a problem that the work efficiency was poor because it had to be inserted into (52). The present invention clarifies a drain board that can be wound even if it is large, and that can significantly improve the driving efficiency.

[0004]

[Means for Solving the Problems] The drain board of the present invention is a strip plate.
The parallel main protrusions (42) and (42) extending in the longitudinal direction at (41) and projecting at equal intervals in the width direction of the strip, and the main protrusions (4) parallel to the respective main protrusions (42).
A pair having a lateral shift prevention ridge (43) protruding lower than the ridge with a gap corresponding to the thickness of 2) and having a large number of through holes (44) formed in the strip (41). Between the main ridges (42) and (4) of the mating board halves (4) and the lateral slip prevention ridges (43). Insert and half board (4)
(4) are overlapped, both strips (41) (41) and main ridges (42) (42)
A half board with a water passage (46) formed between
(4) The water-permeable sheet (3) is covered on (4).

[0005]

[Operation and effect] When the drain board (1) is driven into the ground, excess pore water generated at the time of an earthquake is permeable sheet.
(3), through the through hole (44) of the strip (41), the water passage of the board
It is possible to prevent the liquefaction of the ground by penetrating into the inside of (46) and quickly dissipating the excess pore water pressure. In the drain board (1), the main ridge (42) of the mating board half (4) is fitted between the main ridge (42) of the board half (4) and the lateral deviation prevention ridge (43). Therefore, it is possible to reliably prevent the board half body (4) from being displaced in the width direction. The half board (4) is parallel to the longitudinal direction on one side of the strip (41).
Also, only the lateral shift prevention ridges (43) are provided in a protruding manner, and there is no one that restrains the bending of the ridges (42) (43) on the top side over the entire length in the longitudinal direction. The lateral slip prevention ridges (43) have a lower protruding height than the main ridges (42).
Does not make the board halves so bendable, the board halves (4) can be bent relatively easily in the longitudinal direction. Further, the through hole (44) formed in the strip plate (41) of the half board (4) also has an effect of making the strip plate (41) easy to bend.

The drain board (1) is a half board (4) as described above.
Since (4) is simply laminated and wrapped with the water-permeable sheet (3), the drain board (1) can be wound even if the total thickness of the drain board (1) is about 30 mm. Therefore, every time the drum (1a) wound with the drain board (1) is placed on the placing machine (5) and the drain board (1) is placed on the ground by the procedure shown in FIG. The next drain board (1) can be continuously accommodated in 52). This is because the drain board (1) is cut to a predetermined length and carried to the construction site, and every time the drain board (1) is placed, it is released from the trouble of inserting the drain board into the casing (52), and the work efficiency is improved. Is greatly improved.

[0007]

EXAMPLE As shown in FIG. 1, a drain board (1) is formed by stacking a pair of board halves (4) and (4) and wrapping them in a water permeable sheet (3). The board half body (4) is formed by extrusion molding of synthetic resin, and has parallel main protrusions (42) (42) extending in the longitudinal direction on the strip plate (41) at equal intervals in the width direction of the strip plate (41). It is protruding. In addition, adjacent to each parallel ridge (42) in parallel, each main ridge (4
A lateral shift prevention ridge (43) is provided so as to be lower than the ridge with a gap corresponding to the thickness of 2). In the strip plate (41), a large number of through holes (44) opening to the main ridges (42) (42) are regularly formed. The width of the strip (41) is 100 to 300 mm, and the strip (4
1), the thickness of the main ridge (42) and the lateral slip prevention ridge (43) is about 0.
The protrusion height of the main ridge (42) is 5 mm and is about 30 mm. The protrusion height of the lateral deviation prevention ridge (43) is about 1/3 of that of the main ridge. Each of the ridges (42) (43) has notches (4
5) has been opened.

The pair of board halves (4) (4) are made to face each other on the sides of the main ridges (42) (42), and the main ridges (42) are attached to the main body of the mating board half (4). Insert between the ridges (42) and the lateral slip prevention ridges (43), and stack the board halves (4) (4) on top of each other.
A water passage (46) is formed between 1) and the main ridges (42) (42).
The superposed board halves (4), (4) are housed in a bag-shaped water permeable sheet (3). The bag-shaped water permeable sheet (3) is formed in such a size that there is little room for displacement of both board halves (4), (4) in the width direction.

However, when the drain board (1) is driven into the ground, excess pore water generated at the time of an earthquake is permeable sheet.
(3), through the through hole (44) of the strip (41), the water passage of the board
It is possible to prevent the liquefaction of the ground by penetrating into the inside of (46) and quickly dissipating the excess pore water pressure. In the drain board (1), the main ridge (42) of the mating board half (4) is fitted between the main ridge (42) of the board half (4) and the lateral deviation prevention ridge (43). Therefore, it is possible to reliably prevent the board half body (4) from being displaced in the width direction. The half board (4) is parallel to the longitudinal direction on one side of the strip (41).
Also, only the lateral shift prevention ridges (43) are provided in a protruding manner, and there is no one that restrains the bending of the ridges (42) (43) on the top side over the entire length in the longitudinal direction. Moreover, a lateral slip prevention ridge (43)
Since the protrusion height is lower than that of the main protrusions (42), the presence of the lateral deviation prevention protrusions (43) does not make the board half body so difficult to bend, and the board half body (4) extends in the longitudinal direction. It can be bent relatively easily. Further, the through hole (44) formed in the strip plate (41) of the half board (4) also has an effect of making the strip plate (41) easy to bend.

The drain board (1) is the half board (4) described above.
Since (4) is simply laminated and wrapped with the water-permeable sheet (3), the drain board (1) can be wound even if the total thickness of the drain board (1) is about 30 mm. Therefore, every time the drum (1a) wound with the drain board (1) is placed on the placing machine (5) and the drain board (1) is placed on the ground by the procedure shown in FIG. The next drain board (1) can be continuously accommodated in 52). This is because the drain board (1) is cut to a predetermined length and carried to the construction site, and every time the drain board (1) is placed, it is released from the trouble of inserting the drain board into the casing (52), and the work efficiency is improved. Is greatly improved. If the notches (45) are provided in the ridges (42) (43) at substantially equal intervals as in the embodiment, the drain board (1) can be bent more easily. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of claims for utility model registration.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a drain board of the present invention.

FIG. 2 is an explanatory diagram of a driving procedure of a drain board.

FIG. 3 is a perspective view in which a part of a conventional drain board is cut away.

[Explanation of symbols]

 (1) Drain board (3) Water-permeable sheet (4) Half board (41) Strip (42) Main ridge (46) Water passage

Claims (1)

(57) [Scope of utility model registration request] 1. Parallel main ridges (42) (42) and respective main ridges (4) extending in the longitudinal direction on the strip (41) and projecting at equal intervals in the width direction of the strip.
2) has a lateral deviation prevention ridge (43) protruding parallel to the thickness of the main ridge (42) with a gap corresponding to the thickness of the main ridge (42).
A pair of board halves (4) and (4) having a large number of through holes (44) formed in the band plate (41), and the main ridges (42) and (42) of the other half
Inserted between the main ridge (42) and the lateral slip prevention ridge (43) of (4), the board halves (4) and (4) are overlapped, and both strips (41) (41) and the main ridge A drain board in which a water passage (46) is formed between the strips (42) and (42), and the water permeable sheet (3) is covered on the superposed board halves (4) (4).