JPH0489915A - Water cutoff member and sheet pile using this cutoff structure and executing method for sheet pile - Google Patents

Abstract

PURPOSE:To construct a pile wall having sure water stopping effect by coupling a water stop member with a leading chip fitted in a joint, and arranging this water stop member along the longitudinal of the joint in the position outside of the joint of pile row in the ground on the side opposite the excavation side. CONSTITUTION:A leading chip 2 formed in a shape capable of fitting on joints 10g, 11g is fitted on the joint 10g of an existing pile 10 along the longitudinal of the joints 10g, 11g in the position outside of joint of pile row in the ground on the side opposite the excavation side. Then the joint 11g of a next pile 11 to be driven is fitted on the joint 10g of the existing pile 10, and the leading chip 2 is intruded in the joint 10g of the existing pile 10 and moved by driving of the next pile 11. On the outside of the joints 10g, 11g is furnished a water stop member 3 coupled with this leading chip 2 associate with this intrusive movement.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pile wall having a water-stopping structure, a water-stopping member used for the pile wall, and a construction method for making the pile wall a water-tight structure. .

(Prior Art) Pile walls constructed from steel sheet piles are used for bank protection, earth retaining, etc., but are required to ensure water stoppage. In order to stop this water, it is effective to perform some kind of treatment on the joints of piles where water leaks, and ideas and inventions that have focused on this point have been made in the past.

Among these, Japanese Utility Model Publication No. 64-432 proposes a device in which a water-swellable sealing material is fixed by a support plate along the joints of piles, and this water-swellable sealing material is attached to the joints on the excavation side of the pile row. Water leaking to the excavation side is stopped by applying a rubber sealant.

JP-A-56-12424, JP-A-1-28012
The invention described in Publication No. 1 and Publication No. 1-280122 is to seal the joint part of a pile with a water-stopping material, and by attaching a steel material etc. to the pile to cover the joint part of the pile, the water-stopping material is placed inside the steel material. It is characterized by injecting water into the space, or by forming the joint part of the pile into a special shape with a space, and injecting a water-stopping material into the space.

(Problem to be Solved by the Invention) However, in the former prior art, the water-swellable sealing material is provided on the excavation side of the pile row, so if the soil or water pressure on the opposite side to the excavation side acts from the gap in the joint, the joint The degree of adhesion of the sealing material to the joint decreases, or the sealing material separates from the joint. For this reason, there is a fatal problem that the water-stopping effect is lost.

On the other hand, the latter conventional technology requires work such as attaching steel to the pile so as to fill it with water-stopping material, and molding the joints of the pile into a special shape. The piles cannot be used for any other purpose and have no versatility.

In addition, when filling with water-stopping material, it is necessary to drain the inside of the steel materials and joints with high-pressure water, which not only has poor work efficiency but also may not be able to drain the soil reliably. The effectiveness is partially reduced. Furthermore, if steel is attached, the resistance during pile driving increases, which may cause the pile to fall forward.

The present invention has been made in view of these problems in the prior art, and provides a pile that has a structure that has sufficient water-stopping power and that can be easily constructed without changing the original shape of the pile. The purpose is to provide a wall. Another object of the present invention is to provide a water-stopping member used for constructing this pile wall and a method for constructing a pile wall using this water-stopping member.

(Means for Solving the Problems) The pile wall according to the present invention has a water-stopping structure in which a water-stopping material is provided along the longitudinal direction of the joint on the outside of the joint of the pile row on the ground opposite to the excavation side. The water stop tool of the present invention used for the construction of pile walls includes a leading tip formed into a shape that can be fitted into a joint of a pile, and a water stopping tool connected to the leading tip. The method for constructing a pile wall according to the present invention is characterized in that the leading chip is pushed into the joint of an existing pile while the water-stopping material is connected, and furthermore, the method for constructing a pile wall according to the present invention includes: The leading chip that has been installed is fitted into the joint part of the existing pile, and then the joint part of the next pile is fitted into the joint part of the existing pile, and by driving this next pile, the leading chip is pushed into the joint part of the existing pile and moved. A feature is that a water stop material is applied to the outside of the joint part along the joint part following this pushing movement.

(Function) In the pile wall with the above configuration, the water stop material is installed on the ground side opposite to the excavation side, so when the soil pressure or water pressure of the ground acts, the water stop material adheres to the joint of the pile and has a water stop effect. becomes larger.

In addition, when the leading chip is pushed into the joint of an existing pile, the water-stopping member configured as described above functions to dispose the water-stopping material along the joint while discharging soil from within the joint.

Furthermore, the method for constructing a pile wall with the above structure involves pushing and moving the leading chip into the joint of the existing pile as the next pile is press-fitted or driven, and following this pushing movement, the waterproofing material is applied to the joint. Because it is installed along the pile, it is possible to construct a pile wall that provides water-stopping power to the piles without having to change the design of the piles.

(Example) FIG. 1 shows a first example of a water-stopping member 1, which includes a leading tip 2 and a water-stopping material 3. As shown in FIG. Upper part 2a of leading chip 2
is molded to the same shape and dimensions as the inner surface of the joint part of the pile,
Fitted and pushed into the joint of the pile. Further, the lower part 2b of the leading tip 2 has a pointed shape by forming a tapered surface that slopes in one direction. Like this lower part 2b
Since the pile is formed into a pointed shape, the earth and sand inside the joint of the pile is removed, the resistance at the joint is reduced, and it is easier to push and move within the joint.

The water stop material 3 is connected to one side of the leading chip 2. FIG. 2 shows an example of this water-stopping material 3, which is constructed by inserting a core material such as a wire or rope into a water-swellable sealing material 5. The water-swellable sealing material 5 has the property of absorbing water and swelling, and this swelling exhibits a water-stopping effect. This water stop material 3 is connected to the leading chip 2 and moves along the joint part following the pushing movement of the leading chip 2 into the joint part of the pile.

To connect the water stop material 3 in this embodiment, as shown in FIG.
It is done by carving. Note that the water stop material 3 does not need to be a water-swellable sealing material as long as it is deformed by the action of soil or water pressure from the ground, and may be an elastic material such as rubber, for example.

Furthermore, the water-stopping material in the present invention is not limited to having water-stopping ability by itself, as shown in FIGS. 9 and 10.
As shown in the figure, it includes an injection pipe 8 for injecting grout into the ground along the joint, and in the case of the injection pipe 8, it can be connected to the leading tip 2 by welding.

The water stop material 3 is connected to the leading tip 2 so as to be located outside the joint portion of the pile. FIG. 3 shows the connection position of the water stop material 3 to the leading chip 2, and shows the joint part (grip) Log of the existing pile 10 and the joint part (grip) of the next pile 11.
It is connected so that it is outside the fitting position with 11g.

Next, a method for constructing a pile wall according to this embodiment will be explained.

First, piles such as steel sheet piles are driven into the ground to form the existing piles 10. As shown in FIG. 3, the leading chip 2 is fitted into the joint portion 10g of the existing pile 1o.

In this case, since the leading chip 2 has a shape that fits into the joint portion 10g of the existing pile 10, it can be easily fitted.

Next, the joint part 1 of the next pile 11 is set to the joint part Log of the existing pile 10.
1g and drive the subsequent pile 11. As a result, the next pile 11 enters the ground with the joint parts Log and l1g connected, but the leading chip 2 is inside the joint part 10g of the existing pile 10.
As shown in FIG. 4, the leading tip 2 is gradually pushed into the joint portion 10g. By this pushing movement, the leading tip 2 discharges the earth and sand in the joint part 10g, so the resistance acting on the joint part 11g of the subsequent pile 11 is reduced, and the primary pile 11 smoothly enters into the ground.

When the driving of the next pile 11 is completed, the leading chip 2
reaches the lower end of the joint log of the existing pile 1o. Since the water stop material 3 is connected to the leading tip 2, as the leading chip 2 is pushed and moved, the water stop material 3 moves to the joint part Log, l.
It is applied simultaneously to the outside of 1g.

In this method of constructing a pile wall, the water stop material 3 can be applied to the joints of the piles at the same time as the subsequent piles 11 are driven, so there is no need for high-pressure water injection to remove earth from the joints. Not only can the construction period be shortened, but also the water stop material can be applied reliably. In addition, existing piles can be used as they are without attaching steel to the joints of the piles or making the joints of the piles have a special shape, making it possible to reuse the piles.

Figures 5 and 6 show the first pile wall where this construction was carried out.
An example is shown, and the water stop material 3 is attached to the joint part Lo of the pile row 10.11.
g, l1g along the outside in its longitudinal direction. In these figures, A is the excavation side that will be excavated after the pile wall construction, B is the ground side opposite to the excavation side, and water stop material 3
is located at the joint part of this ground side. Therefore, when pressure P such as pressure or water pressure is applied, the water stop material 3 comes into close contact with the joint from the outside, exerts a large water stop force, and provides a reliable water stop structure.

Moreover, since the pressure P is applied in the direction in which the water stop material 3 comes into close contact with the joint part, the water stop material 3 does not separate from the joint part, and reliable water stop can be performed over time. In this case, since the purpose of the water stop material 3 is to prevent water from leaking from the ground side B to the excavation side A, it is not necessary to apply the water stop material 3 over the entire length of the pile.

FIG. 7 shows a second embodiment of the water-stopping member 1, in which a cover plate 7 made of hard plastic, steel, or the like is provided on the outside of the water-stopping member 3. Cover plate 7 is waterproof material 3
It is attached to the leading chip 2 so as to cover the outer surface of the leading chip 2, and follows the pushing movement of the leading chip 2 into the joint part 10g and enters into the ground together with the water stop material 3.

Since this cover plate 7 covers the outer surface of the water stop material 3, it prevents water from leaking, and when pressure P such as earth pressure or water pressure is applied, it presses the water stop material 3 toward the joint part and closes the water stop material 3. Since it promotes close contact with the joint, water can be stopped more reliably. In particular, when a water-swellable sealing material is used as the waterstopping material 3, the swelling direction is regulated so that the sealant swells toward the joint, thereby increasing the waterstopping power of the sealant. be able to.

In the third embodiment of the water stop member shown in FIG. 8, a water stop material connection fitting 21 is directly attached below the subsequent pile 11 in advance. During construction, the water stop material 3 may be attached to the water stop material connection fitting 21, and the subsequent pile 11 may be driven in as is.

FIG. 9 shows a second embodiment of the pile wall construction method, in which an injection pipe 8 is used as the water-stopping material. injection.

The pipe 8 has many small holes formed therein, and is connected to the leading tip 2 by a method such as welding. This injection pipe 8 follows the pushing movement of the leading chip 2 in the joint part 10a of the existing pile 10, and advances into the ground along the joint part of the pile row 10.11.

As this progresses, grouting agent 9 is injected under high pressure.
The grouting agent 9 is injected from a small hole in the injection pipe 8. In this construction, the grouting agent 9 is injected into the ground along the joints of the rows of piles simultaneously with the pushing movement of the leading chip 2, so that a pile wall having a water-stopping structure can be constructed quickly and easily.

FIG. 10 shows a third embodiment of the pile wall construction method.

In this embodiment as well, the injection pipe 8 is used as a water stop material, but a contact plate 13 is attached to the existing pile 10 near the lower end of the joint. The contact plate 13 is used to stop the injection pipe 8 from entering when the injection pipe 8 comes into contact with it. Therefore, the injection pipe 8 follows the pushing movement of the leading chip 2 and enters into the ground, but when it reaches the contact plate 13, the entry stops.

When a subsequent pile 11 is further driven in this state, the injection pipe 8 and the leading chip 2 are separated.

After this separation, when grouting agent is injected under high pressure while pulling up the injection pipe 8, only the grouting agent remains in the ground, and water is stopped.

In this construction, the depth of the grouting agent can be adjusted by attaching the backing plate 13 at an arbitrary height position.

(Effect of the invention) In the pile wall of the present invention, the water-stopping material is provided along the pile joint on the ground side opposite to the excavation side, so the water-stopping material adheres to the pile joint due to soil pressure and water pressure, making it reliable. Water can be stopped. Moreover, according to the water stop member of the present invention, the water stop material can be easily installed along the joint portion of the pile. Further, according to the construction method of the present invention, a pile wall having a water-stopping effect can be constructed in a short period of time without requiring a change in the design of the pile.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is an enlarged perspective view showing a first embodiment of a water-stopping member, FIG. 2 is an enlarged sectional view showing an example of a water-stopping material, and FIG. An enlarged plan view showing the first embodiment of the construction method, FIG. 4 is a perspective view thereof, FIGS. 5 and 6 are a plan view and side view showing the first embodiment of the pile wall, and FIG. 7 is a water-stopping diagram. Enlarged plan view showing the second embodiment of the member for use, No. 8
9 is a side view showing a third embodiment of the water-stopping member, FIG. 9 is a perspective view showing a second embodiment of the construction method, and FIG. 10 is a perspective view showing a third embodiment of the construction method. 1. Water-stopping member 2. Leading chip 3. Water-stopping material 4. Core material 5. Water-swellable sealing material 6. Connecting pipe 7. Cover plate 8. Injection pipe 10. Existing pile
Log, l1g...Joint part 11...Next pile A...Excavation side B...Ground side

Claims (3)

[Claims] (1) A leading chip formed into a shape that can be fitted into a joint of a pile, and a water stop material connected to the leading chip,
A water-stopping member that pushes the leading chip into the joint of an existing pile while the water-stopping material is connected. (2) A pile wall with a water-stop structure in which a water-stop material is provided along the longitudinal direction of the joint on the outside of the joint of the pile row on the ground opposite to the excavation side. (3) Fit the leading chip shaped to fit into the joint of the existing pile into the joint of the existing pile, and then fit the joint of the next pile into the joint of the existing pile. By driving, the leading chip is pushed into the joint of the existing pile and moved.
A construction method for a pile wall with a water-stop structure in which a water-stop material is applied to the outside of the joint to follow this pushing movement.