JPH07103561B2 - Concrete sheet pile with water holes and method of driving the sheet pile - Google Patents

Description

TECHNICAL FIELD The present invention relates to a concrete sheet pile having a water guiding hole and a method for driving the sheet pile.

(B) Conventional technology Conventionally, there are two types of sheet piles used in civil engineering 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. ing.

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

(C) Problems to be solved by the invention However, in the case of a concrete sheet pile, the cross-sectional area becomes large in order to withstand the wall pressure. Therefore, it is necessary to drive the preceding pile in advance or use a water pipe. Even if the ground is cut by cutting the ground, it cannot be pushed deep into the ground, and there is a problem that the upper end of the sheet pile is damaged or buckles when using a vibrating pile driver.

In the case of steel, for example, when used for revetment, there is a problem that it will be corroded by salt contained in seawater, and its function will not be fulfilled, and if corrosion prevention treatment is performed, the cost may increase, Its use in places where it could be corroded was avoided.

Therefore, when it is necessary to drive a sheet pile deeply 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 the sheet pile is easily corroded by salt, either of the above sheet piles is required. There was a problem that it could not be used.

Therefore, the present invention is to provide a concrete-made sheet pile and a method for driving the sheet pile that can be deeply driven even in a hard ground in a place that is easily corroded by salt.

(D) Means for Solving the Problems The present invention has a substantially U-shaped cross section by means of a flat sheet-pile base portion extending in the up-down direction and a sheet-pile projecting portion projecting to the left and right end portions of the sheet-pile base portion. The sheet pile body is molded from concrete,
A pair of left and right water guiding holes extending in the vertical direction are provided in the sheet pile projecting portion, and the upper end opening of each water guiding hole is opened in the concave space formed by the sheet pile base and the sheet pile projecting portion, and each water guiding hole is formed. It is formed by branching a plurality of water guide branch holes from the lower part of each of the water guide branch holes, and each water guide branch hole is arranged along the cross-sectional shape of the sheet pile body with a substantially U-shaped cross section. The present invention relates to a concrete sheet pile having a water-conducting hole provided with a lower end opening.

Further, the present invention is a flat sheet-shaped sheet pile base portion extending in the up-and-down direction, and a sheet pile projecting portion projecting to the left and right side end portions of the sheet pile base portion is molded with concrete to form a sheet pile body having a substantially U-shaped cross section, A pair of left and right water guiding holes extending in the vertical direction are provided in the sheet pile projecting portion, and the upper end opening of each water guiding hole is opened in the concave space formed by the sheet pile base and the sheet pile projecting portion. It is formed by branching a plurality of water guiding branch holes from the lower part, and each water guiding branch hole is arranged along the cross-sectional shape of the sheet pile body with a roughly U-shaped cross section, for high pressure water jetting at the lower end of each water guiding branch hole. The concrete sheet pile having the water guiding hole provided with the lower end opening of the concrete sheet pile is driven by the following construction procedure, and the concrete sheet pile driving method is Water supply provided by each Connect a pipe for supplying high-pressure water to the upper end opening of the hole. B) Suspend the above concrete sheet pile with a hoist and build it at the sheet pile driving place c) Suspend a vibrating pile driver Chucking machine is chucked at the upper end of the sheet pile d) High pressure water is injected into each water guide hole while adjusting the pressure and flow rate of the high pressure water according to the characteristics of the formation, and branched to the bottom of each water guide hole. While ejecting high-pressure water directly below each lower end opening of the water-conducting branch hole formed in this way, while adjusting the vibration driving force of the vibration type pile driver according to the characteristics of the formation, the pile driver It consists of driving concrete sheet piles.

(E) Action / Effect According to the present invention, the following action / effect is produced.

That is, the sheet pile body to be embedded in the ground has a substantially U-shaped cross section by the sheet pile base portion and the sheet pile projecting portions projecting to the left and right end portions of the sheet pile base portion in order to reduce the pushing resistance received from the ground. Moreover, a pair of left and right water guiding holes extending vertically are provided in the left and right side sheet pile projecting portions, and a plurality of water guiding branch holes are formed under each water guiding hole. Since it is arranged along the cross-sectional shape and the lower end opening for high pressure water jetting is provided at the lower end of each water branch hole, the high pressure water jetted from the lower end opening lowers the sheet pile main body. The ground or the like located on the end face can be cut to reduce the embedding resistance of the sheet pile main body, and the sheet pile main body can be pushed deep into the ground while ensuring smoothness and good straightness.

When the upper end opening of the pair of left and right water guide holes is opened in the concave space formed by the sheet pile base and the sheet pile protrusion, when the vibrating pile driver is chucked at the upper end of the sheet pile body. In addition, it is possible to easily and reliably connect a pipe for supplying high-pressure water to each upper end opening, and prevent each upper end opening from being damaged by hitting another obstacle. You can

In addition, by adjusting the pressure of high-pressure water, the flow rate, and the vibration driving force of the vibratory pile driver according to the characteristics of the formation,
The sheet pile can be driven with low noise pollution, high performance, and high efficiency, and the safety of the ground and the independence of the sheet pile can be secured.

Moreover, since the sheet pile itself is made of concrete, there is no fear of being corroded 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 of piping work of the water pipe can be saved and the jetting position of the high pressure water can be set to the lower end surface of the sheet pile protruding portion. Further, the ground located immediately below the sheet pile projecting portion where the sheet pile receives the most driving resistance can be cut, and the sheet pile can be smoothly driven.

In addition, after driving the sheet pile, the grout is injected through the water guiding hole, and the grout leaks from the lower end opening around the lower end portion of the sheet pile, so-called around the root, and solidifies to solidify the root portion of the sheet pile. The strength of can be increased.

(F) Example An example of the present invention will be described in detail with reference to the drawings.
(A) shown in FIG. 2 is a prestressed concrete sheet pile (hereinafter referred to as PC sheet pile) according to the present invention. The PC sheet pile (A) is arranged in the vertical direction as shown in FIGS. 3 and 4. The flat sheet pile base (1e) that extends and the sheet pile protrusions (1f) (1f) that project from both ends of the sheet pile base (1e) have a generally U-shaped cross section, and have a length of approximately 14m. The sheet pile main body (1) is manufactured from prestressed concrete, and the pair of left and right water conduits (9) (9 ') extending vertically are embedded in each sheet pile protrusion (1f) (1f). As shown in FIG. 5, the upper end portions (9a) (9'a) of the respective water conduits (9) (9 ') are formed by the sheet pile base portion (1e) and the sheet pile projecting portions (1f) (1f). In addition to projecting into the recess space (S), four water branch pipes (9b) (9c) (9d) (9) are provided from the lower part of each water pipe (9) (9 '). 'B) (9'
c) (9'd) and (9'e) are formed by branching, and each of the water branch pipes (9b) to (9e) (9'b) to (9'e) is cross-sectioned as shown in FIG. It is arranged along the cross-sectional shape of the substantially U-shaped sheet pile body (1), and each water branch pipe (9b) to (9e) (9 ').
Nozzles (19) are attached to the lower ends of b) to (9'e), respectively.

In this way, the water guiding holes (2) and (2 ') are formed in the water guiding pipes (9) and (9'), and each water guiding branch pipe (9b) is formed.
~ (9e) (9'b) ~ (9'e) in the water branch hole (2a)
(2'a) ... and further, each water guiding branch hole (2a) ... (2'a) ... is formed at the lower end of the sheet pile body (1).
Furthermore, each water guide branch hole (2
a) ... (2'a), the lower end opening (4) communicating with each
(4 ') ... are formed, and the pressure reducing water is injected from the upper end openings (3) and (3') of the respective water guiding holes (2) and (2 ') to form the respective water guiding holes (2) and (2'). → Each water branch hole (2a)… (2′a)…
→ High-pressure water can be jetted directly downward from the lower end openings (4) ... (4 ').

In FIG. 1, (1a) is a taper surface formed on the lower right side of the sheet pile body (1). The taper surface (1a) drives the PC sheet pile (A) into the soil. PC sheet pile (A)
The soil pressure that always pushes to the left is applied. This is to drive adjacent PC sheet piles (A) into the soil in a connected state. (1d) is a hanging hole.

Here, the manufacturing procedure of the PC sheet pile (A) configured as described above will be described below.

Place the steel material for PC (5) and tighten it.

Arrange the reinforcing bars (6) (7).

The water pipes (9) and (9 ') are arranged.

Assemble the formwork.

Pour concrete into the formwork.

Cure 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 strength etc.

Further, FIGS. 6 and 7 show the mounting state of the exterior water conduit (23) that is installed on site if necessary, and the water conduit (23) is a concave outer wall of the sheet pile body (1). It is installed along.

Further, FIGS. 8 to 10 show the mounting state of the lower end reinforcing cap (24) mounted to reinforce the lower end of the PC sheet pile (A) configured as described above. (24) is made according to the shape of the lower end of the PC sheet pile (A) by using gravel with an N value of more than 50 in the standard penetration test method according to Japanese Industrial Standards, an alloy that has the strength to withstand driving into rock, etc. It is molded and fitted to the lower end in the manufacturing process of the PC sheet pile (A) to be integrated.

Then, as shown in FIG. 10, the cap (24) has a folded back extension (24) inward from the lower end opening (4) of the sheet pile body (1) at the position where the water conduit (9) is disposed.
a) is formed to also serve as the ejection guide sleeve (20) of the water guide pipe (9).

Further, FIG. 11 shows a sheet pile body (1 ′) as another embodiment.
The lower end of the sheet pile body (1 ') is formed in a tapered shape, and a reinforcing cap (24') is attached to the lower end.

In addition, the nozzle (19) eliminates dust in the water guiding pipe (9) in advance by mounting it after performing a jet test of the water guiding pipe (9) at the sheet pile driving site.
The clogging of 9) is prevented.

Further, FIGS. 12 and 13 show PC sheet piles (B) and (C) as another embodiment, and similar to the PC sheet pile (A) described above.
Depending on the sectional shape of the PC sheet piles (B) and (C), the water conduit (25)
The number and arrangement position of (26) are determined.

That is, in the lower end surface of the PC sheet piles (A) (B) (C), the high pressure water can be jetted from a location that receives a large resistance such as the ground at the time of driving, so that the water conduit (9).
The number of (25) and (26) and their positions, as well as the nozzle (19)
Is to determine the number and arrangement position of the.

Next, the procedure for driving the PC sheet pile (A) configured as described above will be described below.

B) Water conduits (9) (9 ') protruding above the PC sheet pile
A pipe for supplying high pressure water is connected to the upper ends (9a) and (9'a) of the.

(B) Perform a jet test of the water conduit (9), and
9) Install.

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

D) Build the PC sheet pile (A) in place.

E) Suspend the vibration type pile driver, and use the pile driver with PC sheet pile (A)
Chuck to the top edge of.

F) High-pressure water is injected into the water conduits (9) (9 '), and water conduit branches (9b) are formed under each water conduit (9) (9').
~ (9e) (9'b) ~ (9'e) → each nozzle (19) ……
→ While ejecting from the lower end opening (4) ... (4 ') ..., activate the vibrating pile driver 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) Remove the hose for supplying high-pressure water from the upper ends of the water pipes (9) and (9 ').

The above is the procedure for driving the PC sheet pile (A), but depending on the hardness of the ground, use the PC sheet pile with the lower end reinforcement cap (24) or use the exterior water conduit (23). It is possible to facilitate the driving of PC sheet piles by mounting or by driving the preceding piles in advance.

Further, the water guide pipes (9) and (9 ') can be used to inject grout into the lower end portion of the PC sheet pile (A) to solidify it for reinforcement.

That is, the following construction procedure is performed continuously from the above-mentioned driving construction procedure.

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

(G) Operate the grout pump to inject the grout into the water conduits (9) (9 ') via the grout supply hose and eject it from each nozzle (19).

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

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

By such a driving construction method, the PC sheet pile (A) can be driven into the hard ground having an N value of 50 or more in the standard penetration test method described above by 10 m or more.

In the present 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.

[Brief description of drawings]

FIG. 1 is a front view of a PC sheet pile according to the present invention. Figure 2 is a bottom view of the PC sheet pile. FIG. 3 is a sectional view of the upper part of the PC sheet pile. FIG. 4 is a sectional view of the center portion of the PC sheet pile. FIG. 5 is an explanatory view of a water pipe. FIG. 6 is an explanatory view of a front mounting state of the exterior water conduit. FIG. 7 is a sectional view taken along line I-I of FIG. 8. FIG. 8 is a front view of a PC sheet pile with a lower end reinforcing cap attached. 9 to 10 are cross-sectional views of the main part of the PC sheet pile. FIG. 11 is a lower sectional view of a PC sheet pile as another embodiment. FIG. 12 and FIG. 13 are plan explanatory views of a PC sheet pile as another embodiment. (A): Prestressed concrete sheet pile (1): Sheet pile body (2): Water guide hole (3): Top opening (4): Bottom opening

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Gonsaku Mizuta 86-5, Tonohara, Chikushino, Fukuoka, Japan (72) Haruki Yasuda, Inventor, Haruki, Hakata-ku, Fukuoka, Fukuoka 3-17-24, Mishiro Heights 306 ( 56) References Japanese Patent Application Laid-Open No. 58-178724 (JP, A) Japanese Patent Application No. 60-71835 (No. Japanese Utility Model Application No. 61-188638) Microfilm (JP) , U)

Claims (2)

[Claims] 1. A flat sheet-pile base (1) extending vertically.
The sheet pile main body (1) having a substantially U-shaped cross section is molded from concrete by using e) and the sheet pile projecting portions (1f) (1f) projecting to the left and right side end portions of the sheet pile base (1e), and the sheet pile projecting is performed. A pair of left and right water guiding holes (2) (2 ') extending vertically is provided in the portion (1f) (1f), and upper end openings (3) (3') of each water guiding hole (2) (2 '). Is opened in the concave space (S) formed by the sheet pile base (1e) and the sheet pile protrusions (1f) (1f), and a plurality of water guiding branches are provided from the lower part of each water guiding hole (2) (2 '). The holes (2a) and (2'a) are formed by branching,
Each water branch hole (2a) (2'a) is arranged along the cross-sectional shape of the sheet pile main body (1) having a substantially U-shaped cross section, and the water branch hole (2a) (2'a) has a high end at the lower end. A concrete sheet pile having water-conducting holes provided with lower end openings (4) (4 ') for ejecting pressure water. 2. A flat sheet-pile base portion (1) extending vertically.
The sheet pile main body (1) having a substantially U-shaped cross section is molded from concrete by using e) and the sheet pile projecting portions (1f) (1f) projecting to the left and right side end portions of the sheet pile base (1e), and the sheet pile projecting is performed. A pair of left and right water guiding holes (2) (2 ') extending vertically is provided in the portion (1f) (1f), and upper end openings (3) (3') of each water guiding hole (2) (2 '). Is opened in the concave space (S) formed by the sheet pile base (1e) and the sheet pile protrusions (1f) (1f), and a plurality of water guiding branches are provided from the lower part of each water guiding hole (2) (2 '). The holes (2a) and (2'a) are formed by branching,
Each water branch hole (2a) (2'a) is arranged along the cross-sectional shape of the sheet pile main body (1) having a substantially U-shaped cross section, and the water branch hole (2a) (2'a) has a high end at the lower end. A method for driving a concrete sheet pile in which a concrete sheet pile having a water guide hole provided with lower end openings (4) (4 ') for jetting pressure water is driven according to the following construction procedure. A) A pipe for supplying high-pressure water is connected to the upper end openings (3) and (3 ') of the water guide holes (2) and (2') provided in the sheet pile protruding parts (1f) and (1f). The concrete sheet pile (A) is hung by a hoist and is installed at the place where the sheet pile is to be driven. D) Injecting high-pressure water into each water guide hole (2) (2 ') while adjusting the pressure and flow rate of the high-pressure water according to the characteristics of the stratum, and lowering each water guide hole (2) (2'). Lower end openings (4) of water-conducting branch holes (2a) (2'a) formed by branching into
(4 ') High-pressure water is jetted directly downward, and the concrete pile is driven by the pile driving machine while adjusting the vibration driving force of the vibration type pile driving machine according to the characteristics of the formation.