JPH1171750A - Sheet pile having drainage function, mounting method of filter for the same, and member for drainage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet pile having a drainage function, which has a long- term liquefaction inhibition function and excellent strength and rigidity. SOLUTION: Hollow drainage canals 5 are formed between a ribbed plate 13a and a sheet pile body 1 by utilizing the recessed section of the sheet pile body 1. In the ribbed plate 13a, a proper number of vertical ribs 15 are formed to the plate 13a in the longitudinal direction of the sheet pile, rigidity to the horizontal pressure of a ground at the time of the execution of the sheet pile and the time of usage is ensured, and deflection in the horizontal direction is prevented. A large number of holes 3 are bored to the plate section of the ribbed plate 13a, and a filter 4 for obviating the penetration of soil and sand is installed. The size of the cross sections of the drainage canals 5 is determined in consideration of the characteristics, drainage resistance, etc. of a liquefaction ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet pile with a drainage function, which is used when constructing a structure on the ground where there is a possibility of liquefaction, a method of mounting a filter therefor, and a drainage member.

[0002]

2. Description of the Related Art As liquefaction suppression means currently in use, there are a soil compaction method and a crushed stone drain method which have been frequently used (see JP-A-56-100919 and JP-A-56-116434). Yes, applied to the ground where liquefaction is expected. Furthermore, pressure-resistant resin pipes provided with a filter on the peripheral surface of the pipe have been conventionally used for the purpose of collecting and draining pore water in the ground and as a measure against liquefaction. In addition, in recent years, in order to drain excess pore water in the ground during an earthquake or the like, a large number of holes have been drilled in a pile made of steel pipe, etc., and a water-permeable filter has been installed in the hole to prevent intrusion of earth and sand. In addition, hollow holed piles (see JP-A-61-146910) and porous concrete piles (see JP-A-61-83711), which are expected to have the strength and rigidity of the pile in addition to the drainage effect, have been developed. I have.

[0003] On the other hand, there have been almost no inventions or ideas devised for the structure of steel sheet piles to prevent liquefaction.
Vertical sheet for drainage attached to steel sheet pile (Japanese Patent Laid-Open No. 62-1463)
No. 15).

[0004]

The ground compaction method is difficult in terms of cost when the liquefied ground alternates with the soft ground, and the crushed stone drain method impairs the drainage effect due to clogging and the like. There is no guarantee of long-term function retention. Further, a hollow holed pile disclosed in JP-A-61-146910,
In the porous concrete pile of No. 83711, the load carrying capacity of the pile body as a structure is reduced due to the holes for drainage. Since pressure-resistant resin pipes have low strength and rigidity, they can hardly be expected to resist unpredictable lateral flow and slippage of the ground due to earthquakes, etc. In order to prevent damage to the construction, the construction method is limited, for example, by using a casing pipe similar to that used in the conventional crushed stone drain method.

[0005] Further, in the steel sheet pile of JP-A-62-146315 in which a vertical pipe for drainage is attached, only drainage is performed from the lower end to the upper end of the vertical pipe, and the drainage function over the thickness of the liquefied ground is provided. Does not have this, and its effect as a liquefaction countermeasure is questionable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet pile with a drainage function that solves the problems in various aspects such as the long-term liquefaction suppressing function, strength, rigidity and liquefaction countermeasure effect in the above-mentioned conventional technology. It is.

[0007]

According to a first aspect of the present invention, there is provided a sheet pile with a drainage function, comprising a plurality of vertical ribs and a plurality of openings having a plurality of openings as drainage members in a predetermined section of the sheet pile. Provided along the longitudinal direction on at least one surface of the sheet pile main body, a hollow drainage space is formed inside by the ribbed flat plate and the sheet pile main body, and the flat plate is formed of soil and sand from the opening portion into the drainage space. A filter for preventing intrusion is provided.

The material of the drainage member is not particularly limited, and any material such as steel, aluminum, or synthetic resin may be used as long as it does not lose its drainage function due to damage when the sheet pile of the present invention is installed in the ground.

The sheet pile body is generally made of steel.
Any other metal or other material may be used as long as it has the necessary strength as a sheet pile. Also,
In order not to lower the original strength of the sheet pile main body, in principle, no holes or the like are formed in the sheet pile main body.

The filter is mounted by using an adhesive on at least a portion of the drainage member on the drainage channel side that is wider than the opening.
Alternatively, it can be easily performed by using a shaping reinforcing material of various shapes (corresponding to claim 5 described later), and can be mounted on site.

The area of the opening has a predetermined ratio to the surface area of the drainage member. Needless to say, the filter is attached to the opening of the drainage member, and may be attached in any manner, as long as the filter is not damaged when the sheet pile of the present invention is installed in the ground. I just need.

When a flat plate is used as a drainage member, if the rigidity of the flat plate is low, the flat plate may bend in the horizontal direction due to the horizontal pressure of the ground during the construction or operation of the sheet pile. In the invention according to the first aspect, a flat plate with a rib is used, the horizontal deflection is suppressed by the stiffening effect of the rib, and the drainage space is secured in a form partitioned into a number of rooms.

The sheet pile with drainage function according to claim 2 of the present application is:
A grid formed by combining a plurality of vertical ribs as drainage members and horizontal plate-shaped members intersecting the vertical ribs at predetermined intervals in a predetermined section of the sheet pile at predetermined intervals to form a large number of openings. The drainage member is provided on at least one surface of the sheet pile main body along the longitudinal direction, and a hollow drainage space is formed inside the lattice-shaped drainage member and the sheet pile body, and the lattice-shaped drainage member is A filter for preventing intrusion of earth and sand from the opening into the drainage space is provided.

Functionally, it is the same as the sheet pile with drainage function according to the first aspect, but it does not require a hole forming process for forming an opening at the time of molding.

A third aspect of the present invention relates to the sheet pile with a drainage function according to the first or second aspect, wherein a water stopping agent is interposed between a contact surface between the drainage member and the sheet pile body.

The drainage member does not necessarily have to be joined over the entire length of the sheet pile body. In such a case, a water blocking agent is interposed in the contact surface in order to prevent intrusion of earth and sand from a gap. It was made.

The sheet pile with drainage function according to claim 4 of the present application is:
In a predetermined section of the sheet pile, a plurality of vertical ribs are provided between a pair of flat plates as a drainage member to form a plurality of box-shaped hollow drainage spaces inside, and at least one of the flat plates A box-shaped structural plate with ribs formed with a large number of openings is provided on at least one surface of the sheet pile main body along the longitudinal direction, and intrusion of earth and sand into the drainage space from the opening into the box-shaped structural plate. It is characterized by having attached a filter for preventing.

The sheet pile with drainage function according to the fourth aspect is functionally the same as that of the first and second aspects, but by adopting such a configuration, the sheet pile with the drainage function having light weight and high rigidity is obtained. Can be obtained.

According to a fifth aspect of the present invention, in the sheet pile with drainage function according to the first, second, third or fourth aspect, the filter is mounted using a shaping reinforcing material for maintaining the shape of the filter. is there.

When a shaping reinforcing material is used, the shaping reinforcing material with a filter is inserted from the longitudinal direction into a drainage space formed by the sheet pile body and the draining member, or into a drainage space formed solely by the draining member. Mounting of the filter can be easily performed without using such a device.

According to a sixth aspect of the present invention, in the method of mounting a filter for a sheet pile with a drainage function according to the fifth aspect, the filter is mounted on the sheet pile with a drainage function according to the fifth aspect, after the sheet pile is driven into the ground, and shaped by a shaping reinforcing material. This is characterized in that the held filter is inserted into the drainage space on site to perform the operation.

A drainage member according to a seventh aspect is a drainage member which can be used for the sheet pile with a drainage function according to the first aspect of the present invention, wherein a plurality of ribs extending in the longitudinal direction and a large number of ribs are provided between the ribs. Of a flat plate with ribs provided with an opening of
At least at the opening position, a filter for preventing intrusion of earth and sand is mounted.

The drainage member according to claim 8 is a drainage member that can be used for the sheet pile with drainage function according to claim 4 of the present application, and includes a plurality of ribs extending in a longitudinal direction between a pair of flat plates. To form a plurality of box-shaped hollow drainage space inside, and to form a large number of openings in at least one of the flat plate, and to prevent intrusion of earth and sand into at least the opening position It is characterized by attaching a filter.

With respect to sheet piles installed on the ground for the purpose of earth retaining, etc., if the ground liquefies during an earthquake, the ground loses its support function. The portion of the ground that is particularly liable to be liquefied is a portion where different kinds of members are contained in the ground, that is, a ground portion near the sheet pile. The support function of the sheet pile depends mostly on the ground near the sheet pile.

Therefore, a liquefaction countermeasure may be applied to the portion of the sheet pile that is in contact with the ground. Liquefaction of the ground is a phenomenon that occurs when excess pore water pressure is generated between the soil particles constituting the ground and the effective stress between the soil particles is lost, and liquefaction can be suppressed by dissipating this excess pore water pressure . In order to dissipate the excess pore water pressure, the pore water between the sediment particles may be discharged out of the ground where liquefaction may occur.

In other words, if a drainage mechanism is provided at the portion of the sheet pile that is in contact with the liquefied ground, the ground support mechanism for the sheet pile can be ensured even during an earthquake, and the strength and rigidity of the sheet pile itself can provide the effect of restraining the ground. It is extremely effective as a countermeasure for the development

[0027] The pore water during the earthquake enters through the opening of the drainage member and is drained through the gap in the drainage member or the gap between the sheet pile body and the drainage member, thereby suppressing liquefaction of the ground around the sheet pile. Is done. At this time, intrusion of earth and sand is prevented by the filter at the opening. Further, the sheet pile main body does not decrease in strength and rigidity, restrains the ground, and can further resist lateral flow, slip, and the like of the ground.

Further, when the sheet pile with drainage function of the present invention is used for clayey soil, it functions as a drain material,
The consolidation settlement of the ground is promoted, and the ground improvement effect and the ground support function of the sheet pile can be expected.

[0029]

FIG. 1 shows a horizontal section of an embodiment of a sheet pile with a drainage function using a flat plate with ribs according to the first aspect of the present invention. In this example, a recess of a sheet pile body 1 is shown. The hollow drainage channel 5 is formed between the ribbed flat plate 13a and the sheet pile main body 1 by utilizing the above.

The ribbed flat plate 13a is provided with an appropriate number of vertical ribs 15 in the lengthwise direction of the sheet pile, so that the rigidity against horizontal pressure of the ground at the time of sheet pile construction or operation is ensured.
Horizontal deflection can be prevented.

When the flat plate 13a is made of steel, the portion where the flat plate 13a and the sheet pile main body 1 are in contact with each other may be joined by welding or the like. The part that comes into contact with the sheet pile body 1
Instead of using the above-described joining means, it is also possible to adopt a structure that only makes contact.

A large number of holes 3 are formed in the flat plate portion of the ribbed flat plate 13a, and the sum of the areas of the holes 3 is about 3 to 5% or more of the surface area of the holed portion. What is necessary is just to provide. The size of the cross section of the drainage channel 5 may be determined in consideration of the characteristics of the liquefied ground, drainage resistance, and the like.

The top of the drainage channel 5 formed by the ribbed flat plate 13a and the sheet pile body 1 is formed by, for example, laminating a metal or synthetic resin net with a filter, or using the net or filter alone. The structure is such that earth and sand are prevented from entering the drainage channel 5. Further, a pipe can be connected to the top of the drainage channel 5 to discharge pore water away from the sheet pile.

As the filter 4 for preventing inflow of sediment,
A stainless steel filter may be used, or a synthetic fiber filter or a synthetic resin filter may be used. When there is a concern about rusting, the latter filter is preferable, and for example, a warp knitted fabric made of nylon, polyethylene monofilament, polyester, or the like, or a nonwoven fabric made of polypropylene, polyester fiber, or the like can be used.

Further, synthetic fibers, synthetic resins,
Alternatively, a filter may be formed by combining or overlapping synthetic fibers and a synthetic resin. For example, on one or both sides of a synthetic fiber filter made of a thin warp knitted cloth or nonwoven fabric, a synthetic resin filter thicker than this synthetic fiber filter, a mesh larger, or thicker than a synthetic fiber filter, larger than the mesh A filter reinforced by laminating synthetic resin nets having many small holes can also be used.

The mesh spacing or gap of the warp knitted fabric, nonwoven fabric, stainless steel filter or the like as the filter 4 is determined in consideration of the particle size distribution of the soil (generally sand ground) to be subjected to liquefaction prevention or the like. It is preferable to set the filter 4 so as not to cause the filter 4 to be clogged with earth and sand.

The mesh spacing or gap can be set as large as about 1 to 3 mm in the ground where liquefaction is likely, and in the ground where the grain size of the soil is particularly large and relatively uniformly distributed. However, there are few such grounds, and it is better to set the ground to be considerably smaller than about 1 to 3 mm in general ground which may be liquefied.

The permeability of the filter 4 in the liquefaction countermeasure depends on the installation ground of the liquefaction countermeasure pile 1 and the like, but is generally preferably about 10 ^-2 cm / sec to 10 ^-1 / sec or more.

The filter 4 may be mounted only on the hole 3 portion. However, if a large number of holes are formed, the filter 4 should be entirely mounted on the inside of the drainage member (drainage channel 5 side). Is reasonable.

The filter 4 may be attached to the inside of the drainage member with a synthetic resin adhesive or the like. Filter 4
It is not always necessary to attach the inside of the drainage member with a synthetic resin adhesive or the like as long as it is shaped to match the shape of the drainage member.

However, in the latter case, it is preferable to use some kind of shaping reinforcing material for shaping the filter 4. As the shaping reinforcing material, a net or a wire net made of a synthetic resin can be used. That is, it is possible to shape a synthetic resin net or wire mesh so as to conform to the shape of the drainage member, use the frame as a framework, and attach the synthetic fiber filter 4 to the net or wire mesh to shape the filter.

The above-shaped filter does not necessarily need to be stuck to the inner surface of the drainage member over its entire length. When the liquefaction-preventing sheet pile of the present invention is put into service, the filter is almost in close contact with the inner surface of the perforated portion of the drainage member. In addition, it is necessary to prevent the sheet from being displaced from the perforated portion of the drainage member even during transportation and construction of the sheet pile.

Therefore, when the shaped filter is not fixed to the drainage member by sticking, the upper and lower ends of the filter shaping reinforcing material are fixed in the drainage member by fasteners or the like to transport the sheet pile or to perform the construction. What is necessary is just to make sure that the filter does not shift.

The material of the flat plate with ribs 13a as a drainage member is not only steel but also synthetic resins such as polyethylene, polyester (FRP, etc.), vinyl chloride, epoxy resin, polypropylene, nylon, stainless steel, and the like. Any such as aluminum may be used.

The attachment of the ribbed flat plate 13a to the sheet pile main body 1 can be performed by welding, adhesive bonding with an adhesive, brazing, mechanical bonding using fasteners, or the like. The drainage member does not need to be joined to the sheet pile main body over the entire length, and may be joined so that the ribbed flat plate 13a does not separate from the sheet pile main body 1 when the sheet pile is driven into the ground.

In this case, a gap is likely to be formed between both ends of the ribbed flat plate 13a and the contact surface of the sheet pile body 1 due to irregularities between the two. When this gap is formed, there is a concern that earth and sand from the ground may flow into the drainage channel 5 from here and block the drainage channel. Also, when the ground is liquefied, when the interstitial water of the ground is discharged through the drainage channel in the drainage member, part of the interstitial water flows out of the gap, the turbulence occurs in the discharged water flow, and the drainage resistance increases. There are also concerns.

In order to prevent such a gap, if a waterproofing agent containing synthetic resin or styrene-butadiene rubber or asphalt as a main component is applied to the contact surface between the channel steel 2 and the sheet pile main body 1, a drainage mechanism can be easily formed. Sufficient watertightness can be maintained (corresponding to claim 3).

Among the water-stopping agents, the one having higher watertightness is a water-absorbing and swelling water-stopping agent. This type of water-stopping agent is mainly composed of a synthetic resin such as special urethane, and it is only necessary to apply the water-stopping agent to a predetermined portion by spraying or brushing. The coating film swells when immersed in fresh water or seawater, and has a property of increasing the thickness by about 8 to 10 times.
Since there is always water in the ground that may be liquefied, this water absorption and swelling property is effective.

As the water-stopping agent, a viscoelastically solidified, water-absorbing and swellable, plate-shaped water-stopping agent made of the same material as described above is provided between the draining member and the contact surface of the sheet pile body. Can be used. In this case, the same water stopping effect as in the above case can be obtained. Even if the waterstopping agent is mainly composed of styrene-butadiene rubber or asphalt, the watertightness of the contact surface between the drainage member and the steel sheet pile can be obtained. This type of waterproofing agent may also be applied to a predetermined portion, and then the drainage member may be pressed against and attached to the sheet pile body. Alternatively, a viscoelastically consolidated flat plate may be used between the contact surface of the drainage member and the sheet pile body, and then the drainage member may be pressed against and attached to the sheet pile body.

The material of the above-mentioned flat plate is desirably a material having viscoelasticity mainly composed of rubber, asphalt and the like.
Similarly, any water-stopping agent may be used as long as watertightness can be obtained.

FIG. 2 shows another embodiment in which a flat plate 13a having a vertical rib 15 is attached.
A drainage channel 5a is secured by attaching a similar flat plate 13b having vertical ribs 15 at both ends to the opposite surface.

Next, as compared with the embodiment shown in FIGS. 1 and 2 described above, a flat plate having many vertical ribs in the longitudinal direction of the sheet pile or a box-shaped structural plate having many vertical ribs between the flat plates is used. An example in which the sheet pile is attached to one or both sides of a sheet pile main body as a drainage member is shown.

FIG. 3 shows an example of a flat plate 16 with ribs having a number of vertical ribs 17. The holes 3 are provided between the vertical ribs 17. The sum of the areas of the individual holes 3 is about 3 to 5% or more of the area of the flat plate portion having the holes. Desirably, many small holes are drilled so as to be evenly distributed.

FIG. 4 shows an example of a box-shaped structural plate 18 having a number of vertical ribs 19 between two or more flat plates (corresponding to claim 4). The hole 3 is provided in one of the flat plates between the vertical ribs 19. Alternatively, both flat plates may have a structure in which the hole 3 is formed. Similarly, the sum of the areas of the individual holes is such that the sum of the areas of the flat portions where the holes are formed is about 3 to 5% or more, and a relatively large number of relatively small holes are drilled so as to be uniformly distributed. Is desirable.

As shown in FIGS. 3 and 4, when a large number of vertical ribs are provided on the drainage member, a lightweight and highly rigid drainage member can be obtained. When a rigid member is integrally attached to the sheet pile main body, the horizontal deflection of the drainage member can be suppressed even when the sheet pile is installed on the ground and then subjected to the horizontal pressure of the ground. Thus, when the above-described drainage member is attached to the sheet pile body, the drainage channel is not crushed by the ground pressure even during construction, and the ground reaction force can be reliably obtained while securing the drainage channel even when the sheet pile is in service. You can build a strong wall.

The material of the drainage member is not particularly limited, and synthetic resins such as polyethylene, polyester, vinyl chloride, epoxy resin, polypropylene, and nylon, fiber-reinforced synthetic resin (FRP), steel, stainless steel, Any such as aluminum may be used.

As a method for producing the drainage member, polyethylene, polyester,
Vinyl chloride, polypropylene, nylon, ethylene
This is possible by continuously extruding a thermoplastic synthetic resin such as a vinyl acetate copolymer. After the extrusion molding, when the synthetic resin is relatively soft, it can be easily perforated by pressing a jig having a number of pointed steel bars or the like. Further, even when it becomes hard, it can be easily drilled with a drill, a shearing machine or the like.

When the drainage member is made of the above-mentioned thermoplastic resin, as shown in FIG.
2 are arranged in a grid at intervals, and the intersections of the grids are heat-welded, resin-based, or bonded to form a grid-shaped drainage member 20 having a large number of holes 3b (gap). .

Further, the grid-like drainage member 20 is made of steel,
In the case of stainless steel or the like, the intersection is welded and joined as shown in FIG.
Can be obtained. Further, when the drainage member is aluminum or the like, the structure shown in FIG. 7 can be obtained by welding or brazing the intersection.

FIGS. 5 and 6 show an example in which the flat plate 16 with ribs or the box-shaped structure plate 18 shown in FIGS. 3 and 4 is attached to one surface (recess) of the sheet pile main body 1. The drainage member 20 shown in FIG. 7 can be attached similarly to FIGS. In FIG. 5, the drainage member is attached up to the flange portion of the sheet pile main body 1, but it may be only the web portion at the center of the sheet pile main body 1.

These drainage members may be mounted on the convex surface of the sheet pile main body 1 as shown in FIG. 8, or may be mounted on both sides of the sheet pile main body 1 as shown in FIG.

At the tip of the drainage member, as shown in FIG.
In particular, a tip protection plate 14 having a wedge-shaped tip is provided so that the drainage member does not detach from the sheet pile main body 1 when the sheet pile is constructed. Further, the upper end of the drainage member may be provided with a net, a filter, or a combination of a filter and a net so that soil and the like do not enter the drainage channel.

Further, in order to prevent earth and sand from entering through a large number of holes 3 provided in the drainage member, the drainage member side of the drainage member is provided with a structure shown in FIG.
The filter 4 may be attached as shown in FIG. In this case, the filter 4 is a flat plate with ribs 1 as a drainage member.
6, the ribbed flat plate 16 can be attached to the sheet pile main body 1 in advance with a resin adhesive or the like.

As another mounting method of the filter 4, a shaping reinforcing member 8 a having a shape adapted to the drainage space is manufactured, and at least the hole 3 of the ribbed flat plate 16 of the shaping reinforcing member 8 a is provided. The filter 4 is attached to the side. The shaping reinforcing member 8a can be made of a wire net or a net made of a synthetic resin.

FIG. 11 shows an example of mounting the shaping reinforcing material 8a and the filter 4. In this example, the filter 4 is made of a shaping reinforcing material 8.
a. Of course, it is only necessary that the filter is attached to at least the surface of the orthopedic reinforcing material corresponding to the hole of the drainage member.

FIGS. 12 and 13 show an example in which the filter 4 is mounted using the shaping reinforcing material 8a. In this case, after attaching the drainage member to the sheet pile body 1, the shaping reinforcing material 8 a to which the filter 4 is attached may be inserted into a space surrounded by the drainage member and the sheet pile body 1. In addition, a shaping reinforcing material 8a having a filter 4 attached thereto is attached between the ribs of the flat plate 16 with ribs or the box-shaped structural plate 18 as a drainage member, and the drainage member thus treated is attached to the sheet pile body 1. Is also good.

As a method of attaching the drainage member to the sheet pile body, for example, the following method can be adopted. (1) When the drainage member is made of, for example, polyethylene resin, at least one side of the steel sheet pile main body to which the drainage member is to be attached, a suitable portion of the steel sheet pile body that comes into contact with the drainage member is subjected to a primer treatment, Preheat the sheet pile body. If the preheated drainage member is pressed against the preheated steel sheet pile main body using an adhesive between the steel sheet pile main body and the drainage member, the steel sheet pile main body and the drainage member are firmly integrated.

(2) The drainage member is, for example, steel, stainless steel,
When made of aluminum, at least one side of the steel sheet pile body to which the drainage member is to be attached is welded or brazed to an appropriate portion where the drainage member and the steel sheet pile body are in contact with each other, and the steel sheet pile body is connected to the drainage member. Member can be firmly integrated.

(3) The drainage member of any material can be mechanically attached to the steel sheet pile main body. For example,
As shown in FIG. 14, the nut 24 is welded to an appropriate position of the steel sheet pile main body 1 and brought into contact with the surface of the steel sheet pile main body 1 to which the drainage member is to be attached, and the hole 3 of the drainage member is used. Thus, the drainage member can be attached with the bolt 25 and the washer 26. The mounting method using the bolt can be used alone or in combination with the mounting methods described in (1) and (2) above.

(4) A waterproofing agent may be used in the above-described mounting method. That is, a waterproof agent can be used on the contact surface between the drainage member and the sheet pile main body. For example, welding can be used to attach the drainage member, and when the flat drainage member is attached to the concave surface of the sheet pile main body, it is not necessary to weld over the entire contact surface portion between the flat plate and the sheet pile main body. At this time, if there is concern about the water stoppage at the contact surface between the flat plate and the sheet pile body even at the portion not to be welded or at the portion to be welded, the watertightness of the drainage channel formed by the drainage member using the water stoppage agent at the contact surface. Nature can be achieved.

FIG. 15 shows an example in which a sheet pile with a drainage function as a liquefaction-preventing sheet pile of the present invention is installed on the ground. The drainage mechanism may be provided in the sheet pile A over at least the length of the liquefied layer 31 of the ground. Liquefaction layer 3 during earthquake
When excessive pore water pressure is generated in 1, the pore water in the ground around the sheet pile A flows into the drainage member and is discharged upward. Therefore, liquefaction of the ground around the sheet pile can be prevented.

FIG. 16 shows an example in which the sheet pile with drainage function as the liquefaction-preventing sheet pile of the present invention is applied to embankment. This sheet pile is provided near the slope slope of the embankment where liquefaction is most likely to occur. In this case, even if the embankment 34 is about to collapse during an earthquake, the collapse of the embankment can be prevented by the rigid sheet pile A installed on the ground where liquefaction is prevented.

FIGS. 17 and 18 show examples in which the sheet pile with drainage function as the liquefaction-preventing sheet pile of the present invention is applied to a retaining wall.
As shown in these figures, even when the layer thickness of the liquefied layer is different before and after the retaining wall, the drainage mechanism is provided on the sheet pile B at least over the layer thickness of the liquefied layer 31, 31a of the ground. Just do it. That is, the drainage member may not be above the upper end of the liquefied layer 31a.
By using the sheet pile of the present invention, a strong steel sheet pile wall can be made even during an earthquake.

The above-described sheet pile with a drainage function of the present invention is used as a sheet pile having a drain (drainage) function for promoting consolidation settlement of the ground, etc., by being used on the ground other than the liquefied ground. You can also.

For example, liquefaction is unlikely to occur in a viscous soil, but for the purpose of improving the ground, consolidation settlement of the ground is promoted by using various drain materials.
However, in such ground, drain materials (sand drains, paper drains, plastic drains, etc.) must be installed in close proximity to the sheet piles that have been cast for earth retaining, etc. due to the limitations of the drain material construction machine. Can not.

In this case, by making the sheet pile itself have a drainage function, the consolidation settlement of the ground can be uniformly promoted, and the ground improvement effect and the ground support function of the sheet pile can be enhanced. In addition, in the sheet pile having this drainage function, it is not necessary to quickly discharge the interstitial water of the ground as in the case of liquefaction, so the cross section of the drainage channel may be made smaller than the sheet pile for preventing liquefaction. It is possible, and it is also possible to reduce the porosity of the drainage member.

In addition to this, for example, when there is a layer of sandy soil or the like where liquefaction may occur on a layer of viscous soil where consolidation settlement occurs, the sheet pile with drainage function of the present invention is used. It is also possible to exert the effect of promoting consolidation, the effect of suppressing liquefaction, and the function as a sheet pile.

[0078]

EFFECT OF THE INVENTION Since the liquefaction of the ground around the sheet pile during an earthquake can be suppressed by using the sheet pile with a drainage function of the present invention, a sheet pile structure having high seismic performance can be provided. In addition, the sheet pile with drainage function not only prevents liquefaction, but also resists unintended lateral flow and slippage of the ground during an earthquake, and can be used as a reinforcing material for embankment.

By using a flat plate with ribs, a box-shaped structural plate, a grid-like drainage member, or the like as the drainage member, a drainage space can be easily secured, and the rigidity of the rib allows the sheet pile to be removed from the ground during construction or operation. It can handle horizontal pressure and is easy to manufacture.

When a large number of vertical ribs are provided on the drainage member, a lightweight and highly rigid drainage member can be provided. After the drainage member is integrally mounted on the sheet pile body and installed on the ground, it receives the horizontal pressure of the ground. Even horizontal deflection is suppressed.

The sheet pile with drainage function of the present invention can use conventional construction equipment (vibrohammer, press-fitting machine, etc.) for installation on the ground, and the drainage mechanism is provided integrally with the sheet pile. Therefore, it is not necessary to put drainage means such as crushed stones around the sheet pile after the sheet pile has been constructed, and the construction efficiency is good in obtaining a sheet pile with liquefaction measures.

Since the hollow drainage channel formed by the drainage member and the sheet pile body is provided with a predetermined filter for preventing soil from entering the ground, the drainage channel is clogged and the liquefaction inhibiting function is impaired. Don't worry.

The water can be easily and effectively stopped between the steel sheet pile main body and the drainage member by using a water-absorbing and swelling water-stopping agent, for example. Thus, the effect of drainage from the drainage channel during liquefaction can be maintained.

The filter can be easily mounted using a wire mesh or other lattice-shaped reinforcing material, and can also be inserted and filled into the drainage channel on site.

In a seawall or earth retaining wall composed of ordinary sheet piles, even if an attempt is made to compact the ground behind with a vibrating rod or a sand compaction pile in order to suppress liquefaction, a sheet pile within a few meters of the seawall or earth retaining wall is used. Excessive stress is generated or the sheet pile protrudes and cannot be compacted. Therefore, at present, crushed stone drains are unavoidably installed near revetments and earth retaining walls, but this is not sufficient in terms of measures to prevent liquefaction. However, if the sheet pile with drainage function of the present invention is used for such a revetment or earth retaining wall, since the liquefaction of the ground near the sheet pile can be reliably prevented, there is a great advantage that a revetment or an earth retaining wall having earthquake resistance is obtained. .

When a sheet pile is provided on the ground including a viscous soil layer that consolidates and settles, in order to promote consolidation settlement,
A conventional drain material is often struck on this ground. However, the drain material cannot be hit on the ground near the sheet pile due to the restriction of the machine for constructing the drain material. In such a case, the use of the sheet pile of the present invention can improve the ground improvement effect and the ground support function of the sheet pile.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a sheet pile with a drainage function using a flat plate with ribs according to claim 1;

FIG. 2 is a horizontal sectional view showing a modified example of the embodiment shown in FIG. 1;

FIG. 3 is a perspective view showing one embodiment of a drainage member formed with a number of vertical ribs.

FIG. 4 is a perspective view showing one embodiment of a box-shaped structural plate as a drainage member.

FIG. 5 is a perspective view showing an example of a liquefaction-inhibiting sheet pile using a ribbed flat plate or a box-shaped structural plate having a number of vertical ribs.

FIG. 6 is a plan view corresponding to the embodiment of FIG. 5;

FIG. 7 is a perspective view showing an embodiment of a grid-like drainage member according to claim 2;

FIG. 8 is a plan view showing a modification of the embodiment of FIG. 5;

FIG. 9 is a plan view showing another modification of the embodiment of FIG. 5;

FIG. 10 is a horizontal sectional view showing an example of a method of mounting a filter in a drainage space.

FIG. 11 is a perspective view showing an example of a method of mounting a filter using a shaping reinforcing material in a drainage space.

FIG. 12 is a horizontal sectional view showing a method of mounting a filter using a shaping reinforcing material in a drainage space.

FIG. 13 is a horizontal sectional view showing another example of a method of mounting a filter using a shaping reinforcing material in a drainage space.

FIG. 14 is a horizontal sectional view showing an example of attachment of a drainage member.

FIG. 15 is a vertical sectional view showing an application example of the sheet pile with drainage function of the present invention.

FIG. 16 is a vertical sectional view showing another application example of the sheet pile with a drainage function of the present invention.

FIG. 17 is a sectional perspective view showing still another application example of the sheet pile with drainage function of the present invention.

FIG. 18 is a vertical sectional view showing still another application example of the sheet pile with a drainage function of the present invention.

[Explanation of symbols]

A, B: sheet pile with drainage function, 1: sheet pile main body, 3: small hole, 4
... Filter, 5,5a ... Drainage channel, 8a ... Shaping reinforcement,
13a: flat plate with ribs, 14: protection plate at the tip, 15
... vertical ribs, 16 ... flat plate with ribs, 17 ... vertical ribs, 18 ...
Box-shaped structural plate, 19: vertical rib, 20: lattice-shaped drainage member,
Reference numeral 21: vertical rib, 22: horizontal plate member, 24: nut, 25
... Bolts, 26 ... Washers, 31, 31a ... Soil which may be liquefied, 32 ... Filling, 33 ... Drainage, 34 ... Filling

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Hiroshi Kita 4-33, Kitahama, Chuo-ku, Osaka City Inside Sumitomo Metal Industries Co., Ltd.

Claims (8)

[Claims] In a predetermined section of a sheet pile, a ribbed flat plate having a plurality of vertical ribs and a large number of openings as a drainage member, with the side having the rib facing the sheet pile body,
At least one surface of the sheet pile main body is provided along the longitudinal direction, and the ribbed flat plate and the sheet pile main body form a hollow drainage space inside, and the flat plate is formed of soil and sand from the opening to the drainage space. A sheet pile with drainage function, equipped with a filter to prevent intrusion. 2. A plurality of openings are formed in a predetermined section of a sheet pile by combining a plurality of vertical ribs as drainage members and horizontal plate members crossing the vertical ribs at predetermined intervals in a lattice shape. A grid-like drainage member formed is provided on at least one surface of the sheet pile main body along the longitudinal direction, and the grid-like drainage member and the sheet pile main body form a hollow drainage space inside, and the grid-like drainage member is formed. A sheet pile with a drainage function, wherein a filter for preventing intrusion of earth and sand from the opening into the drainage space is attached to the drainage member. 3. A sheet pile with a drainage function according to claim 1, wherein a water-stopping agent is interposed between a contact surface between the drainage member and the sheet pile main body. 4. In a predetermined section of a sheet pile, one member as a drainage member is provided.
A plurality of vertical ribs are provided between a pair of flat plates, and a plurality of box-shaped hollow drainage spaces are formed inside, and a plurality of openings are formed in at least one of the flat plates. A box-shaped structure plate is provided on at least one surface of the sheet pile main body along the longitudinal direction, and the box-shaped structure plate is provided with a filter for preventing intrusion of earth and sand from the opening into the drainage space. Sheet pile with drainage function. 5. The sheet pile with drainage function according to claim 1, wherein the filter is mounted using a shaping reinforcing material for maintaining the shape of the filter. 6. The method according to claim 5, wherein the filter is mounted in the drainage space on site after the sheet pile has been cast on the ground. 7. A drainage function provided with a plurality of ribs extending in the longitudinal direction and a ribbed flat plate having a large number of openings between the ribs, wherein a filter for preventing intrusion of earth and sand is provided at least at the positions of the openings. Drainage material for sheet pile. 8. A plurality of ribs extending in the longitudinal direction are provided between a pair of flat plates to form a plurality of box-shaped hollow drainage spaces inside, and a plurality of openings in at least one of the flat plates. And a drainage member with a drainage function provided with a filter for preventing intrusion of earth and sand into at least the opening position.