JPH05140927A - Water stop plate for steel sheet pile and excavation method for ground using such plate - Google Patents

Abstract

PURPOSE:To enhance the water cutoff performance in the case of poor workmanship of joining of steel sheet piles for use in sheathing with one another by fitting by pressure a flexible water stop plate in the gap at each joint of sheet piles, and inserting by pressure the water stop plates bit by bit in compliance with excavation process. CONSTITUTION:A water stop plate 4 made from a flexible material is fitted by pressure in the gap 3 at each joint of steel sheet piles 1a, 1b for use in sheathing at the time of excavating the ground. When the excavation has progressed to attain a certain depth, the water stop plate 4 is inserted still deeper by pressure into the ground, and the excavating work is continued to make excavation to the specified depth. Even in case the joining part of two adjoining sheet piles 1a, 1b is not in good engagement when sheet piles are driven, the gap 3 is blocked with the water stop plate 4. Thereby soil/sand or subsoil water can be prevented certainly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stop plate for steel sheet piles and a method for excavating the ground using the water stop sheet. In particular, even when the joining of adjacent steel sheet piles is uncertain, ground excavation work is performed. The present invention relates to a water stop plate for steel sheet piles and a method for excavating the ground using the water stop plate.

[0002]

2. Description of the Related Art Conventionally, when excavating the ground, steel sheet piles have been used for retaining the water and stopping water to prevent the surrounding ground from collapsing (mounting method). In this mountain retaining method, when the steel sheet piles are driven, the joint portions between the adjacent steel sheet piles may not mesh with each other. When excavating the ground in such a state,
Sediment and groundwater flow out from the gap between the joints of steel sheet piles, making it difficult to perform excavation work. Therefore, conventionally, in advance, chemical injection or the like is performed on the ground near the joint portion of the steel sheet pile,
Excavation work was carried out after the ground was improved.

[0003]

In the above-mentioned conventional mountain retaining method, when the joints of the steel sheet piles do not mesh with each other, chemical injection or the like is performed on the ground in the vicinity of the joints of the steel sheet piles in advance,
Since excavation work is performed after the ground is improved, there is a problem that construction cost and work time are required.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to reliably and inexpensively deposit earth and sand even when the joint portions of steel sheet piles are not meshed with each other. This is to prevent groundwater from flowing out and to excavate the ground.

[0005]

In order to achieve the above object, the steel sheet pile water stop plate of the present invention is embedded in the ground,
It has a plurality of steel sheet piles that prevent outflow of earth and sand, groundwater, and the like, and a water stop plate that is press-fitted into a joint portion between adjacent steel sheet piles and closes a gap formed in the joint portion. Further, at the tip of the water stop plate, a small sheet pile having a pressure plate for engaging the joint portion and press-fitting the water stop plate into the ground is mounted. Further, in the method of excavating the ground using the water stop plate of the present invention, by embedding a plurality of steel sheet piles in the ground, to prevent the outflow of earth and sand, groundwater, etc., in the method of excavating the ground When a water stop plate for closing the gap formed in this joint is press-fitted into the joint of adjacent steel sheet piles, and then the ground excavation work is started, and when the excavated ground reaches a predetermined depth. , This excavation work is interrupted, the water stop plate is press-fitted further deeply into the ground, and then the excavation work is restarted. To do.

[0006]

According to the above-mentioned water stop plate for steel sheet piles of the present invention, since the water stop plate is press-fitted into the joint between the adjacent steel sheet piles and has a water stop plate for closing the gap formed in this joint, it is adjacent. It is possible to prevent soil and groundwater from flowing out to the excavated ground through the gap between the joints of the steel sheet piles. Furthermore, since a small sheet pile formed in a shape that meshes with the joint portion is attached to the tip of the water stop plate, it is easy to press fit the water stop plate into the joint portion. Further, since the pressure supporting plate is provided on the small sheet pile, the water blocking plate can be easily press-fitted into the ground by hitting the pressure supporting plate. Further, according to the underground excavation method using the water stop plate of the present invention, the interruption of the excavation work,
Since the excavation is carried out to a predetermined position in the ground while repeatedly pressing the water stop plate into the ground and resuming the excavation work, it is possible to perform the excavation work while surely preventing the drainage of sediment and groundwater. ..

[0007]

Embodiments of the present invention will be described with reference to the drawings. Figure 1
Shows a plane in a state where the steel sheet pile 1a and the steel sheet pile 1b are embedded in the ground. This steel sheet pile 1
Is provided to prevent the collapse of the surrounding ground and the outflow of groundwater when excavating the ground. At the time of driving the steel sheet pile 1, the groove portion 2a of the steel sheet pile 1a and the groove portion 2 of the steel sheet pile 1b.
In some cases, b may not mesh with each other.

In this case, a gap 3 is created between the groove 2a of the steel sheet pile 1a and the groove 2b of the steel sheet pile 1b. If the ground is excavated in this state, soil and groundwater will flow out, making the excavation difficult. Therefore, as shown in FIG. 1, the groove portion 2a of the steel sheet pile 1a and the groove portion 2b of the steel sheet pile 1b.
A water blocking plate 4 is installed in a gap 3 between This prevents outflow of sediment and groundwater.

FIG. 2 shows the details of the water blocking plate 4. The water stop plate 4 has a band-like shape in which the groove portions 5a and 5b are symmetrically provided. This is the groove 2 of the steel sheet pile 1a, 1b.
2 (a) has a shape that does not deviate from a and 2b.
There is some margin as shown by the broken line portion 6 in (b).
This water stop plate 4 is made of flexible polyvinyl chloride (PC
V) or chlorobrane rubber or the like, and is freely deformed to fit the gap 3 between the non-engaged steel sheet piles 1a and 1b, and the gap 3 is closed. Since the gap 3 is closed in this way, earth and sand and groundwater do not flow out during the ground excavation work. Also, this water stop plate 4
Can be deformed into a roll shape as shown in FIG. As a result, it is easy to carry.

At the tip of the water stop plate 4, a small sheet pile 7 having a shape that meshes with the groove portions 2a, 2b of the steel sheet piles 1a, 1b is mounted. The cross section of the sheet pile 7 in the EE direction is shown in FIG. As shown in FIG. 2C, the small sheet pile 7 is configured by joining the member 7a and the member 7b with the bolt 9 and has the groove portions 12a and 12b. Furthermore, FIG.
As shown in (d), the tip of the sheet pile 7 has a thin structure 11
The bolt 10 and the adhesive are attached to the tip of the water stop plate 4. The bolt engaging hole of the sheet pile 7 is an elongated hole and can be adjusted according to the lap length. Further, on the excavated ground side of the small sheet pile 7, a bearing plate 8 is provided.
Is provided. By hitting the bearing plate 8 with a hydraulic jackie or a hammer, the sheet pile 7 is pressed into the ground.

Next, a method of excavating the ground will be described with reference to FIG. A steel sheet pile 1 is embedded in the ground, and a case where the left ground 13 is excavated with the steel sheet pile 1 as a boundary will be described. First, the groove portions 12a and 12b of the small sheet pile 7 and the groove portions 2a and 2b of the steel sheet pile 1 are engaged with each other. Since the small sheet pile 7 is formed in substantially the same shape as the joint between the groove portions 2a and 2b of the steel sheet pile 1, the engagement can be easily performed.

Next, the tip of the water stop plate 4 is connected to the tip of the sheet pile 7 by using a bolt 10 and an adhesive (see FIG. 2).
(See (a) and (d)). Then, the bearing plate 8 provided on the small sheet pile 7 is struck by a hydraulic jackie or a hammer to move the small sheet pile 7 and the water stop plate 4 along the gap 3 between the steel sheet pile 1a and the steel sheet pile 1b. Press in. Then, excavation work for the ground 13 is started. Then, when the ground 13 reaches the vicinity of the tip of the press-fitted sheet pile 7,
This excavation work is interrupted temporarily, and the bearing plate 8 is hit,
The small sheet pile 7 and the water stop plate 4 are pressed into a deeper position in the ground along the gap 3 between the steel sheet pile 1a and the steel sheet pile 1b.

After that, the excavation work which has been temporarily suspended is restarted. In this way, excavation is performed up to a predetermined position in the ground while repeatedly suspending and resuming the excavation work. In this way, since the water stop plate 4 is press-fitted prior to the excavation work, it is possible to reliably prevent the sediment and groundwater from flowing out to the excavated ground.

[0014]

According to the water shutoff plate for steel sheet piles of the present invention, since the water shutoff plate is press-fitted into the joining portion between the adjacent steel sheet piles, the gap between the joining portions of the adjacent steel sheet piles is It is possible to prevent sediment and groundwater from flowing out to the excavated ground. further,
Since a small sheet pile is attached to the tip of this water stop plate,
It becomes easy to press the water stop plate into the joint portion. Further, since the pressure supporting plate is provided on the small sheet pile, the water blocking plate can be easily press-fitted into the ground by hitting the pressure supporting plate. Further, according to the ground excavation method using the water stop plate of the present invention, excavation to a predetermined position in the ground is repeated while repeatedly interrupting the excavation work, press-fitting the water stop plate into the ground, and restarting the excavation work. Therefore, excavation work can be performed while reliably preventing the loss of sediment and groundwater.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a water blocking plate according to the present invention is installed on a steel sheet pile.

FIG. 2 is a diagram showing details of a water stop plate and a small sheet pile.

FIG. 3 is a diagram showing a method of excavating the ground using the water blocking plate according to the present invention.

[Explanation of symbols]

 1 Steel sheet pile 2 Groove part of steel sheet pile 3 Gap 4 Water stop plate 7 Small sheet pile 8 Bearing plate

Claims (3)

[Claims] 1. A plurality of steel sheet piles that are buried in the ground to prevent outflow of earth and sand, groundwater, etc., and are press-fitted into a joint portion between adjacent steel sheet piles to close a gap formed in the joint portion. A water stop plate for a steel sheet pile. 2. A small sheet pile that is formed in a shape that meshes with the joint portion and that has a bearing plate for press-fitting the water stop plate into the ground is attached to the tip of the water stop plate. The water stop plate for steel sheet piles according to claim 1. 3. A method of excavating the ground by embedding a plurality of steel sheet piles in the ground to prevent the outflow of earth and sand, groundwater, etc., and to join the adjacent steel sheet piles to the joint portion. Press the water stop plate to close the gap formed in the section, then start the excavation work of the ground, when the excavated ground reaches a predetermined depth, interrupt the excavation work, the water stop plate Was further pressed deep into the ground, and then the excavation work was restarted, and while stopping and restarting the excavation work, excavating to a predetermined position in the ground was used. How to excavate the ground.