JPH07238544A - Concrete sheet pile having water-conveyance hole and driving method thereof - Google Patents

Abstract

PURPOSE:To bury a concrete sheet pile deeply in the ground and, at the same time, to make it possible to execute the consolidation of foundation of the lower end of the concrete sheet pile. CONSTITUTION:A sheet pile main body 1 having the approximately U-shaped section is constituted of a flat plate-like sheet pile base 1e extended in the vertical direction and sheet pile projections 1f and 1f projected to both ends of the sheet pile base 1e and is molded of concrete. Water-conveyance holes 2 and 2' extended to the vertical direction are provided in the sheet pile projections 1f and 1f, at the same time, upper end openings 3 and 3' of water- conveyance holes 2 and 2' are projected into a recessed space S formed of the sheet pile base 1e and sheet pile projections 1f and 1f, high pressure water or grout is fed from the upper end openings 3 and 3', and such water-conveyance holes are obtained as high pressure water or grout can be injected directly downward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete sheet pile having a water guiding hole and a method for driving the sheet pile.

[0002]

2. Description of the Related Art Conventionally, there are two types of sheet piles used for civil works such as revetments and retaining walls, one made of concrete and the other made of steel. Such sheet piles are pushed into the ground by a vibrating pile driver. There is.

Depending on the hardness of the ground, a preceding pile (a so-called dummy pile or pilot pile) may be driven in advance to make a hole in the ground, a sheet pile may be driven into the hole, or the outer wall of the sheet pile may be cut. In this method, a water pipe is installed along the longitudinal direction, high pressure water is ejected from the water pipe, and the sheet pile is driven while cutting the ground.

[0004]

However, in the case of a concrete sheet pile, the cross-sectional area becomes large in order to withstand the wall pressure, and therefore the preceding pile is driven in advance or the ground pipe is used by utilizing the water conduit. Even if it was cut, it could not be pushed deep into the ground, and when using a vibrating pile driver, there were problems such as damage to the upper end of the sheet pile and buckling.

In the case of steel, for example, when it is used for revetment, there is a problem that it is corroded by salt contained in seawater and its function cannot be fulfilled. Therefore, it was avoided to use it in a place where it might be corroded.

Therefore, when it is necessary to drive a sheet pile deep into a hard ground where the N value exceeds 50 in the standard penetration test method according to the Japanese Industrial Standards in a place where it is easily corroded by salt, There was a problem that neither sheet pile could be used.

[0007]

In view of the above, according to the present invention, a sheet pile base having a substantially U-shaped cross section is formed by a flat sheet pile base extending in the vertical direction and sheet pile protrusions protruding from both ends of the sheet pile base. Is formed by concrete, with the water guiding hole extending vertically in the sheet pile protruding portion, the upper end opening of each water guiding hole is projected into the concave space formed by the sheet pile base portion and the sheet pile protruding portion, High pressure water or grout is injected from each upper end opening, and high pressure water or grout is injected from the lower end opening of each water guide hole. It is a thing.

Further, the present invention provides a method for driving a concrete sheet pile into which the above concrete sheet pile is to be driven according to the following construction procedure. Connect a pipe for high pressure water supply to the upper opening of the water guide hole. B) Suspend the above concrete sheet pile with a hoist and build it at the sheet pile driving place c) Suspend a vibration type pile driver, The pile driver is chucked at the upper end of the sheet pile. D) Depending on the characteristics of the formation, adjust the pressure and flow rate of the high-pressure water into each water guide hole and direct it downward from the lower end opening. While ejecting and adjusting the vibration driving force of the vibrating pile driver according to the characteristics of the stratum, the concrete pile sheet is driven by the pile driving machine. E) Grouting is injected into each water guide hole, and the lower end opening More gush The concrete sheet pile is then leaked around the lower end of the concrete sheet pile and solidified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. (A) shown in FIGS. 1 and 2 is a prestressed concrete sheet pile (hereinafter referred to as PC sheet pile) according to the present invention. As shown in FIGS. 3 and 4, the sheet pile (A) has a flat sheet-pile base portion (1e) extending in the vertical direction, and a sheet-pile projecting portion (1e) projecting at both ends of the sheet-pile base portion (1e). 1f) and (1f) are used to manufacture a long sheet pile main body (1) with a U-shaped cross section and a total length of about 14 m from prestressed concrete, and in each sheet pile protrusion (1f) (1f), from the upper end Water guide holes (2) (2 ') are provided in the longitudinal direction across the lower end.
(2) High pressure water or grout is injected from the upper opening (3) (3 ') of the (2'), and the lower opening (4) (4 ') of the water guiding hole (2) (2').
Higher pressure water or grout can be ejected.

In FIG. 1, (1a) is a tapered surface formed on the lower right side of the sheet pile body (1), and the process of driving the PC sheet pile (A) into the soil by the tapered surface (1a). So, the earth pressure is always applied to the left side of the PC sheet pile (A). This is for driving the adjacent PC sheet piles (A) into the soil in a connected state.

Further, (1b) is a convex portion for connection fitting, (1c) is a concave portion for connection fitting, and (1d) is a hanging hole.

FIG. 3 is a sectional view of the upper end portion of the PC sheet pile (A), and FIG. 4 is a sectional view of the central portion of the PC sheet pile (A), in which (5) is a piano wire. Steel materials for PC such as, (6) and (7) are reinforcing bars, and (8) is an upper reinforcing plate.

The above-mentioned water guiding holes (2) (2 ') are formed in the water guiding pipe (9) by embedding the water guiding pipe (9) shown in FIG. 5 in the sheet pile body (1). It is what is done.

As shown in FIG. 5, such a water conduit (9) includes a horizontal pipe (10) whose one end projects outward from the upper part of the concave outer wall of the sheet pile main body (1), and a horizontal pipe (10) of the same. A socket (11) for communicating connection with one end projecting outward of (10), an elbow (12) communicating with the other end of the horizontal pipe (10), and an upper end communicating with the lower end of the elbow (12). A first vertical pipe (13) and a second vertical pipe (13) having a lower end connected to the lower end of the first vertical pipe (13) through a first socket (14).
The vertical pipe (15) and the second socket (16) at the lower end of the second vertical pipe (15)
To the third vertical pipe (17), the upper end of which is communicated and connected via a nozzle, the nozzle (19) attached to the lower end of the third vertical pipe (17) via a third socket (18), and the nozzle (19). It is composed of a spout guide sleeve (20) to be connected.

Moreover, a pipe for supplying high-pressure water is connected to the socket (11), and the high-pressure water is supplied to the sheet pile body.
The nozzle (19) located at the lower part of (1) is made to jet below the sheet pile body (1) via the jet guide sleeve (20).

The water pipe (9) is arranged in the left and right side sheet pile projections (1f) (1f) where the lower end surface of the PC sheet pile (A) receives a large resistance from the ground or the like at the time of driving.

Here, the PC sheet pile constructed as described above.
The manufacturing procedure of (A) is as follows.

A steel material (5) for PC is placed and tensioned.

The reinforcing bars (6) and (7) are arranged.

Arrange the water conduit (9).

Assemble the formwork.

Concrete is poured into the formwork.

Curing concrete.

Pre-stress is introduced into the sheet pile body (1) by loosening the tension of the steel material (5) for PC.

Inspect and test the strength and the like.

Further, FIGS. 6 and 7 show an arrangement state of a water conduit (21) as another embodiment. The water conduit (21) is shown in FIG.
Is provided with a four-pronged branch pipe (21a) at the lower end.
Four nozzles (22) can be attached to the tip of a).

Further, FIGS. 8 and 9 show the mounting state of the exterior water conduit (23) which is installed on site as needed, and the water conduit (23) is attached to the sheet pile main body (1). Mounted along the concave outer wall.

Further, FIGS. 10 to 12 show a mounting state of the lower end reinforcing cap (24) mounted for reinforcing the lower end of the PC sheet pile (A) constructed as described above. The cap (24) is a PC sheet pile made of gravel and gravel having an N value of more than 50 in the standard penetration test method according to Japanese Industrial Standards, alloy having strength enough to be driven into rock, and the like.
Molded according to the shape of the lower end of (A), the same PC sheet pile (A)
In the manufacturing process of, the lower end is fitted and integrated.

As shown in FIG. 12, the cap (24) is folded back and extended inward from the lower end opening (4) of the sheet pile body (1) at the position where the water conduit (9) is arranged. Division (24
a) to form the jet guide sleeve (2) for the water conduit (9).
0) is also used.

FIG. 13 shows the lower part of the sheet pile main body (1 ') as another embodiment, in which the lower end of the sheet pile main body (1') is formed into a taper shape, and the lower end portion is reinforced. The cap (24 ') is attached.

It should be noted that the nozzle (19) is installed after performing a jet test of the water conduit (9) at the sheet pile driving site to eliminate dust in the water conduit (9) in advance, and the nozzle (19) It is designed to prevent clogging.

FIGS. 14 and 15 show PC sheet piles (B) and (C) as another embodiment.
As with the sheet pile (A), depending on the cross-sectional shape of the PC sheet pile (B) (C),
The number and location of the water conduits (25) and (26) are determined.

That is, at the lower end surface of the PC sheet piles (A) (B) (C), a high pressure water can be jetted from a portion which receives a large resistance such as the ground at the time of driving, so that a water conduit is ejected.
The number and arrangement position of (9), (25) and (26), and the number and arrangement position of the nozzles (19) are determined.

Next, the PC sheet pile (A) constructed as described above.
The construction procedure for driving in is as follows.

A) Water conduit projecting from the top of the PC sheet pile
Connect the high pressure water supply pipe to the socket (11) of (9).

(B) Perform an injection test of the water conduit (9),
Install the nozzle (19).

C) Hang the PC sheet pile (A) with a hoist.

D) Install the PC sheet pile (A) at a predetermined place.

(E) Suspend the vibrating pile driver and chuck the pile driver on the upper end of the PC sheet pile (A).

F) High-pressure water is injected into the water pipe (9), jetted from the nozzle (19), and the vibrating pile driver is operated to drive the PC sheet pile (A).

At this time, the pressure and flow rate of the high pressure water and the vibration driving force of the vibration type pile driver are adjusted according to the characteristics of the formation.

G) After driving the PC sheet pile (A) to a predetermined depth, the supply of high pressure water is stopped and the operation of the vibration type pile driver is stopped.

H) Socket for high pressure water supply hose
Remove from (11).

The above is the procedure for driving the PC sheet pile (A). However, depending on the hardness of the ground, the lower end reinforcement cap (2
By using the PC sheet pile with 4) attached, by installing the exterior water pipe (23), and by installing the preceding pile in advance, it is possible to drive the PC sheet pile easily.

Furthermore, a PC sheet pile is used by utilizing the water conduit (9).
Inject grout into the lower end of (A) and solidify for reinforcement.

That is, following the above-mentioned driving procedure, the following procedure is carried out.

(4) Connect the grout supply hose to the socket (11).

(G) The grout pump is operated to inject the grout into the water conduit (9) through the grout supply hose and eject it from the nozzle (19).

At this time, a nozzle with a check valve is used as the nozzle (19).

Le) After injecting a predetermined amount of grout, stop the grout pump and remove the grout supply hose.

By such a driving construction method, a PC sheet pile is used.
(A) has an N value of 50 in the standard penetration test method described above.
It is possible to drive 10 m or more into the above hard ground.

In this embodiment, the sheet pile made of prestressed concrete has been described, but the sheet pile made of reinforced concrete is not limited to the sheet pile made of prestressed concrete.

[0053]

According to the present invention, the following operational effects are produced.

That is, a water guiding hole can be provided in the sheet pile protruding portion of the concrete sheet pile, high pressure water can be injected from the upper end opening of the water guiding hole, and the high pressure water can be jetted from the lower end opening. In addition, it is possible to smoothly push the sheet pile deep into the ground while cutting the ground located at the lower end surface of the sheet pile with the high pressure water.

At this time, the sheet pile embedded in the ground is formed in a substantially U-shaped cross section by the sheet pile base portion and the sheet pile projecting portion in order to reduce the pushing resistance received from the ground, and has a relatively small pushing resistance. Since the lower end opening of the water conduit is placed on the lower end surface of the large sheet pile protruding part and high pressure water can be jetted directly downward from the lower end opening, the ground etc. is cut by the water of the same high pressure. As a result, the pushing resistance can be made as small as possible, and the sheet pile can be smoothly pushed deep into the ground.

Since the upper end opening of the water conduit is projected into the concave space formed by the sheet pile base and the sheet pile projection, when the vibrating pile driver is chucked at the upper end of the sheet pile body. Moreover, it is possible to reliably connect the pipes for supplying high-pressure water to the upper end openings, and to prevent the upper end openings from being damaged by hitting other obstacles. .

Further, by adjusting the pressure and flow rate of the high pressure water and the vibration driving force of the vibrating pile driver according to the characteristics of the formation, the sheet pile can be driven with low noise pollution, high capacity and high efficiency. It is possible to secure the safety of the ground and the independence of the sheet pile while it can be inserted.

Moreover, since the sheet pile itself is made of concrete, there is no fear of corrosion unlike steel sheet piles.

Further, compared to the conventional one in which a water pipe is piped on the outer wall of the sheet pile, the labor for piping the water pipe is saved and the jetting position of the high pressure water is set to the lower end face of the sheet pile projection. Therefore, the ground located immediately below the sheet pile projecting portion where the sheet pile receives the most driving resistance can be cut to smoothly perform the sheet pile driving operation.

Further, after such a sheet pile is driven, grout is injected through the water guiding hole, and the grout is leaked from the lower end opening around the lower end portion of the sheet pile, that is, around the root so as to be solidified, The strength around the root of the sheet pile can be increased.

[Brief description of drawings]

FIG. 1 is a front view of a PC sheet pile according to the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a sectional view of an upper portion of a PC sheet pile.

FIG. 4 is a sectional view of a central portion of the PC sheet pile.

FIG. 5 is an exploded view of the water conduit.

FIG. 6 is an explanatory view illustrating a front mounting state of a water conduit tube as another embodiment.

FIG. 7 is an explanatory view of a bottom surface mounting state of the water guide tube.

FIG. 8 is an explanatory view showing a front mounting state of the exterior water conduit.

9 is a sectional view taken along line II-II of FIG.

FIG. 10 is a front view of a PC sheet pile having a lower end reinforcing cap attached thereto.

FIG. 11 is a sectional view of a main part of the PC sheet pile.

FIG. 12 is a cross-sectional view of a main part of the PC sheet pile.

FIG. 13 is a bottom sectional view of a PC sheet pile as another embodiment.

FIG. 14 is a plan view of a PC sheet pile as another embodiment.

FIG. 15 is a plan view of a PC sheet pile as another embodiment.

[Explanation of symbols]

 (A) Prestressed concrete sheet pile (1) Sheet pile body (2) Water guide hole (3) Top opening (4) Bottom opening

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Gosaku Mizuta 86-5, Tonohara, Chikushino, Fukuoka Prefecture (72) Haruki Yasuda Inventor Haruki Yasuda 3-17-24, Mugino, Hakata-ku, Fukuoka, Fukuoka 306 Mishiro Heights

Claims (2)

[Claims] 1. A flat sheet-pile base portion (1) extending vertically.
e) and the sheet pile protrusions protruding from both ends of the sheet pile base (1e)
(1f) (1f) and a sheet pile main body (1) having a substantially U-shaped cross section is molded from concrete, and water guide holes (2) (2 ') extending vertically in the sheet pile protrusions (1f) (1f) are formed. ) Is provided and the upper end opening (3) (3 ') of each water guide hole (2) (2') is formed into a concave space formed by the sheet pile base (1e) and sheet pile protrusions (1f) (1f). (S) project into the upper end opening (3) (3 ') and inject high pressure water or grout into the lower end opening (4)
(4 ') A concrete sheet pile having a water-conducting hole capable of ejecting high-pressure water or grout directly downward. 2. A flat sheet-pile base portion (1) extending vertically.
e) and the sheet pile protrusions protruding from both ends of the sheet pile base (1e)
(1f) (1f) and a sheet pile main body (1) having a substantially U-shaped cross section is molded from concrete, and water guide holes (2) (2 ') extending vertically in the sheet pile protrusions (1f) (1f) are formed. ) Is provided and the upper end opening (3) (3 ') of each water guide hole (2) (2') is formed into a concave space formed by the sheet pile base (1e) and sheet pile protrusions (1f) (1f). (S), and then inject high-pressure water from each upper opening (3) (3 '), and through the lower opening (4) (4') of each water guide hole (2) (2 '). A concrete sheet pile driving method in which a concrete sheet pile (A) having a water-conducting hole capable of ejecting high-pressure water directly downward is driven by the following construction procedure. B) Water guide holes (2) provided in the sheet pile protrusions (1f) (1f) respectively
Connect a pipe for supplying high-pressure water to the upper opening (3) (3 ') of (2') b) Suspend the above concrete sheet pile (A) with a hoist and build it in the sheet pile driving place. C) Suspend the vibration type pile driver and chuck the pile driver to the upper end of the sheet pile (A) d) Adjust the pressure and flow rate of the high pressure water according to the characteristics of the stratum, Pour into holes (2) (2 ') and open at bottom opening
(4) While ejecting directly downward from (4 ') and adjusting the vibration driving force of the vibrating pile driver according to the characteristics of the stratum, the concrete pile board is driven by the pile driver (e) Grout is injected into each water guide hole (2) (2 ') and ejected from the lower end opening (4) (4') to make concrete sheet pile (A).
It leaks around the lower end of the and solidifies.