JP2657180B2 - Concrete sheet pile having water guide holes and driving method of the sheet pile - Google Patents

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 water holes and a method of driving the sheet pile.

[0002]

2. Description of the Related Art Conventionally, sheet piles used in civil engineering works such as seawalls and retaining walls are made of concrete or steel. These sheet piles are pushed into the ground by a vibrating pile driver or the like. I have.

Depending on the hardness of the ground, a leading pile (so-called dummy pile, pilot pile) is previously driven to make a hole in the ground, and a sheet pile is driven into the hole, or an outer wall of the sheet pile is formed. In this method, a water pipe is piped along the longitudinal direction, high-pressure water is jetted from the water pipe, and a sheet pile is driven while cutting the ground.

[0004]

However, in the case of concrete sheet piles, the cross-sectional area becomes large in order to be able to withstand wall pressure. Cannot be pushed deep into the ground even if it is cut, and when a vibratory pile driver is used, the upper end of the sheet pile is damaged or buckled.

[0005] In the case of steel, for example, when used for revetment, there is a problem that it is corroded by salt contained in seawater and its function cannot be performed. Therefore, use in places where there is a risk of corrosion was avoided.

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

[0007]

Therefore, in the present invention, a sheet pile body having a substantially U-shaped cross section is provided by a flat sheet pile base extending vertically and sheet pile projections protruding from both ends of the sheet pile base. Molded with concrete, while providing water guide holes extending in the vertical direction in the sheet pile protrusion, the upper end opening of each water guide hole, projecting into the concave space formed by sheet pile base and sheet pile protrusion, A high-pressure water or grout is injected from each upper end opening, and a concrete sheet pile having a water guide hole capable of jetting the high-pressure water or grout directly downward from the lower end opening of each water guide hole is provided. Things.

Further, the present invention provides a method for driving a concrete sheet pile into which the above-mentioned concrete sheet pile is driven by the following construction procedure. A pipe for supplying high-pressure water is connected to the opening at the upper end of the water guide hole. B) The concrete sheet pile is suspended by a lifting machine, and it is built at the place where the sheet pile is driven. C) A vibratory pile driver is suspended. The pile driver is chucked to the upper end of the sheet pile. D) According to the characteristics of the stratum, the high pressure water is injected into each water hole while adjusting the pressure and flow rate. The concrete pile is driven by the vibratory pile driver while adjusting the vibratory driving force of the vibratory pile driver according to the characteristics of the stratum, and grout is injected into each water hole and the lower end opening is formed. More spurts Then, it leaks around the lower end of the concrete sheet pile and solidifies.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1A and FIG. 2A show 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 (1e) extending in the vertical direction, and sheet pile projecting portions (1e) protruding from both ends of the sheet pile base (1e). 1f) and (1f), a longitudinal sheet pile body (1) having a U-shaped cross section and a total length of about 14 m is manufactured from prestressed concrete, and each sheet pile projecting portion (1f) (1f) is inserted from the upper end. Water supply holes (2) and (2 ') are provided in the longitudinal direction over the lower end.
(2) Inject high-pressure water or grout from the upper end opening (3) (3 ') of (2') and open the lower end opening (4) (4 ') of the water introduction hole (2) (2').
High pressure water or grout can be ejected.

In FIG. 1, (1a) is a tapered surface formed at the lower right end of the sheet pile body (1), and the process of driving the PC sheet pile (A) into the soil by the tapered surface (1a). Thus, an earth pressure is constantly applied to the PC sheet pile (A) so as to press it to the left. This is for driving the adjacent PC sheet pile (A) into the ground in a connected state.

[0011] Further, (1b) is a connection fitting projection, (1c) is a connection fitting recess, and (1d) is a suspension hole.

FIG. 3 is a cross-sectional view of the upper end of the PC sheet pile (A), and FIG. 4 is a cross-sectional view of the central part of the PC sheet pile (A). And (6) and (7) are the reinforcing bars, and (8) is the upper reinforcing plate.

Further, the above-mentioned water guide holes (2) and (2 ') are formed in the water guide pipe (9) by embedding the water guide pipe (9) shown in FIG. 5 in the sheet pile body (1). Is what is done.

As shown in FIG. 5, the water pipe (9) comprises a horizontal pipe (10), one end of which protrudes outward from the upper part of the concave outer wall of the sheet pile body (1); A socket (11) connected to one end protruding outward of (10), an elbow (12) connected to the other end of the horizontal pipe (10), and an upper end connected to the lower end of the elbow (12). A first vertical pipe (13) to be connected to a lower end of the first vertical pipe (13) via a first socket (14).
A vertical pipe (15) and a second socket (16) at the lower end of the second vertical pipe (15)
A third vertical pipe (17) having an upper end communicating therewith via a nozzle, a nozzle (19) attached to a lower end of the third vertical pipe (17) through a third socket (18), and a nozzle (19). And a spouting guide sleeve (20) to be connected.

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 ejected downward from the sheet pile body (1) via an ejection guide sleeve (20).

The water pipe (9) is disposed in the left and right sheet pile protruding portions (1f) (1f) where the lower end face of the PC sheet pile (A) receives great resistance from the ground or the like at the time of driving.

Here, the PC sheet pile constructed as described above is used.
The manufacturing procedure of (A) will be described below.

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

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

A water pipe (9) is arranged.

Assemble the formwork.

The concrete is cast into the formwork.

Curing the concrete.

Prestress is introduced into the sheet pile body (1) by relaxing the tension of the steel material for PC (5).

The strength and the like are inspected and tested.

FIGS. 6 and 7 show the arrangement of a water pipe (21) as another embodiment.
Is provided with a four-pronged branch pipe (21a) at the lower end.
Four nozzles (22) can be attached to the tip of a).

FIG. 8 and FIG. 9 show the mounting state of the exterior water pipe (23), which is installed on site as necessary. The water pipe (23) is attached to the sheet pile body (1). Mounted along the concave outer wall.

FIGS. 10 to 12 show the mounting state of the lower end reinforcing cap (24) mounted to reinforce the lower end of the PC sheet pile (A) constructed as described above. The cap (24) is made of a PC sheet pile made of a gravel having an N value exceeding 50 in a standard penetration test method according to Japanese Industrial Standards, an alloy having a strength capable of withstanding driving into rock, or the like.
(A) is shaped according to the shape of the lower end of the PC sheet pile (A)
In the manufacturing process, the lower end is fitted and integrated.

Then, as shown in FIG. 12, the cap (24) is folded and extended inward from the lower end opening (4) of the sheet pile main body (1) at the position where the water pipe (9) is disposed. Department (24
a) to form a spout guide sleeve (2
0) is also used.

FIG. 13 shows a lower portion of a sheet pile main body (1 ') as another embodiment. The lower end of the sheet pile main body (1') is formed into a tapered shape. The cap (24 ') is attached.

In addition, the nozzle (19) is attached after performing the injection test of the water pipe (9) at the sheet pile driving site, thereby eliminating dust in the water pipe (9) in advance, and installing the nozzle (19). To prevent clogging.

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

That is, a water pipe is provided on the lower end surface of the PC sheet piles (A), (B), and (C) so that high-pressure water can be blown out from a location such as the ground which is greatly subjected to resistance during driving.
(9) The number and arrangement positions of (25) and (26), and the number and arrangement positions of the nozzles (19) are determined.

Next, the PC sheet pile (A) constructed as described above
The following is a description of the construction procedure for driving the above.

B) A water pipe protruding above the PC sheet pile
Connect the high pressure water supply pipe to the socket (11) of (9).

B) An injection test of the water pipe (9) is performed.
Install the nozzle (19).

C) The PC sheet pile (A) is suspended by a lifting machine.

D) The PC sheet pile (A) is erected at a predetermined place.

E) A vibratory pile driver is suspended, and the pile driver is chucked to the upper end of the PC sheet pile (A).

(F) High-pressure water is injected into the water pipe (9) and spouted from the nozzle (19), and the vibratory 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 vibratory 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 vibratory pile driver is stopped.

H) A hose for supplying high-pressure water to a socket
Remove from (11).

The above is the procedure for driving the PC sheet pile (A). Depending on the hardness of the ground, the lower end reinforcing cap (2) may be used.
By using a PC sheet pile to which 4) is attached, by attaching an exterior water pipe (23), or by previously setting a leading pile, the driving of the PC sheet pile can be facilitated.

Further, using a water pipe (9), a PC sheet pile is used.
Grout is injected into the lower end of (A), and the foundation is reinforced.

That is, following the above-described driving procedure, the following procedure is performed.

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

(G) The grout pump is operated, grout is injected into the water pipe (9) through the grout supply hose, and is spouted from the nozzle (19).

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

After the grout is injected in a predetermined amount, the grout pump is stopped, and the grout supply hose is removed.

According to such a driving method, a PC sheet pile is used.
(A) was compared with an N value of 50 in the standard penetration test method described above.
It can be driven into the above hard ground for 10 m or more.

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

[0053]

According to the present invention, the following functions and effects are produced.

That is, since a water guide hole is provided in the projecting portion of the sheet pile made of concrete, high-pressure water can be injected from the upper end opening of the water guide hole, and the high-pressure water can be ejected from the lower end opening. In addition, while cutting the ground located on the lower end face of the sheet pile with the high-pressure water, the sheet pile can be pushed deeply and smoothly into the ground.

At this time, the sheet pile buried in the ground is formed into a substantially U-shaped cross section by a sheet pile base and a sheet pile projecting part in order to reduce the pushing resistance received from the ground. The lower end opening of the water guide hole is located on the lower end surface of the large sheet pile projection, and high-pressure water can be ejected directly downward from the lower end opening. 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.

When the vibratory pile driving machine is chucked at the upper end of the sheet pile main body, since the upper end opening of the water guide hole is projected into the concave space formed by the sheet pile base and the sheet pile projecting portion. In addition, it is possible to reliably connect the pipe for supplying high-pressure water to each upper opening, and to prevent each upper opening from being damaged by hitting another obstacle. .

Further, by adjusting the pressure and flow rate of the high-pressure water and the vibration driving force of the vibratory pile driving machine according to the characteristics of the stratum, the above-described sheet pile can be driven with low noise pollution, high performance and high efficiency. The ground safety and the independence of the sheet pile can be ensured.

Moreover, since the sheet pile itself is made of concrete, there is no fear that the sheet pile will be corroded like steel sheet piles.

Further, as compared with the prior art in which a water guide pipe is provided on the outer wall of the sheet pile, the work of piping the water guide pipe can be omitted, and the jetting position of the high-pressure water is located at the lower end face of the sheet pile projecting portion. Therefore, it is possible to cut the ground located immediately below the sheet pile protruding part where the sheet pile receives the most driving resistance, and to perform the sheet pile driving operation smoothly.

After the sheet pile is driven, grout is injected through the water introduction hole, and the grout is leaked around the lower end of the sheet pile from the opening at the lower end, that is, around the root, and solidified. The strength around the root of the sheet pile can be increased.

[Brief description of the 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 II of FIG. 1;

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

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

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

FIG. 6 is an explanatory view showing a front installation state of a water pipe as another embodiment.

FIG. 7 is an explanatory view of a state where the water pipe is attached to the bottom surface.

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

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

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

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

FIG. 12 is an essential part cross-sectional view of the PC sheet pile.

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

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

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

[Explanation of symbols]

 (A) Prestressed concrete sheet pile (1) Sheet pile body (2) Water hole (3) Upper opening (4) Lower opening

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Gonaku Mizuta, Inventor 86-5, Otonohara, Chikushino-shi, Fukuoka (72) Inventor Haruki Yasuda 56) References JP-A-58-178724 (JP, A)

Claims (2)

(57) [Claims] A flat sheet pile base (1) extending vertically.
e) and the sheet pile projections protruding from both ends of the sheet pile base (1e)
(1f) (1f) is used to form a sheet pile main body (1) having a substantially U-shaped cross section from concrete, and into the sheet pile protrusions (1f) (1f), water guide holes (2) (2 ′) extending vertically. ), And the upper end openings (3) (3 ′) of the water guide holes (2) (2 ′) are formed in a concave space formed by the sheet pile base (1e) and the sheet pile protrusions (1f) (1f). (S), and inject high-pressure water or grout from the upper end openings (3) (3 ') to lower end openings (4) of the water guide holes (2) (2').
(4 ′) A concrete sheet pile having a water guide hole through which high-pressure water or grout can be jetted downward. 2. A flat sheet pile base (1) extending vertically.
e) and the sheet pile projections protruding from both ends of the sheet pile base (1e)
(1f) (1f) is used to form a sheet pile main body (1) having a substantially U-shaped cross section from concrete, and into the sheet pile protrusions (1f) (1f), water guide holes (2) (2 ′) extending vertically. ), And the upper end openings (3) (3 ′) of the water guide holes (2) (2 ′) are formed in a concave space formed by the sheet pile base (1e) and the sheet pile protrusions (1f) (1f). (S), and inject high-pressure water from the upper end openings (3) (3 ') to the lower end openings (4) (4') of the water guide holes (2) (2 '). A method for driving a concrete sheet pile (A) having a water guide hole through which high-pressure water can be ejected directly downward by the following construction procedure. B) Water introduction holes (2) provided in the sheet pile protrusions (1f) (1f)
Connect a pipe for supplying high-pressure water to the upper opening (3) (3 ') of (2'). B) Hang the above concrete sheet pile (A) with a lifting machine and build it at the place where the sheet pile will be driven. C) Hang the vibratory pile driver and chuck the pile driver on 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, Inject into holes (2) and (2 ')
(4) (4 ') Driving a concrete sheet pile with a vibratory pile driver while adjusting the vibratory driving force of the vibratory pile driver according to the characteristics of the stratum while causing it to erupt directly downward. Grout is injected into each of the water introduction holes (2) and (2 '), and is spouted from the lower end openings (4) and (4').
Around the lower end of the