JPH1121892A - Construction method for water passage of sheathing wall with steel pipe columns and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intend a sheathing wall with steel pipe columns to pass underground water and enable the restoration of underwater water stream. SOLUTION: Sheathing walls A, A with steel pipe columns are created with a construction ground B in between. As a steel pipe member for use in it, steel pipes 1 equipped with water passage holes 3 are formed on the back ground C and construction ground B. After formation of the sheathing walls A, the inside of the steel pipes 1 is excavated and the produced earth is exhausted, and a water shutoff device 7 is inserted into the steel pipes 1, and excavation of the construction ground B and construction of the intended underground structure are executed in the condition that the water passage holes 3 are choked by the opening/closing operation from over the ground, and thereafter the holes 3 are opened through manipulation of the water shutoff device 7, and thus the walls A, A are given a water passing function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining wall using a steel pipe sheet pile or the like, which is used as an earth retaining wall, and is formed with a water hole in the steel pipe so that the groundwater flow can be restored. The present invention relates to a water passage method and a steel tube water passage device used for the method.

[0002]

2. Description of the Related Art In the construction of an underground structure or the like, an excavation of an underground portion is performed by constructing a retaining wall made of reinforced concrete or a column of steel pipes around the construction area. The rest is buried. Retaining walls generally have a structure that places emphasis on water shielding, and the creation of such walls often interrupts the groundwater flow, causing large fluctuations in the groundwater level and often adversely affecting the surrounding environment. In particular, in recent years, as construction has become larger, this has become a social problem.

[0003] In order to solve this problem, in the underground continuous retaining wall using reinforced concrete, as a countermeasure for permeating groundwater, the shape of the inserted reinforcing bar or the property of cast-in-place concrete is taken as a measure. And the like have been proposed. In addition, there is an actual example in which water holes are formed in the retaining wall using a propulsion method to restore the groundwater flow.

[0004]

However, in the above-mentioned various methods of making the retaining wall made of reinforced concrete impervious, the construction is troublesome and requires a large amount of cost. There is a problem that a construction site (a shaft) for installing equipment for the construction method is required, so that the construction range is widened, and the construction period and construction cost are increased. In addition, in the case of the steel pipe column retaining wall, it is difficult to change the structure of the prefabricated steel pipe because it is made of a pre-made steel pipe, so that it is not suitable as a structure for restoring the groundwater flow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is intended to utilize a columnar retaining wall of a steel pipe sheet pile having many advantages such as good workability, excellent strength and excellent water shielding. To form a water hole by processing it into a hole, open and close the water hole by operation on the ground, and after using it as a retaining wall, form a water hole in the steel pipe to restore the groundwater flow. An object of the present invention is to provide a method capable of performing the method and an apparatus for passing water through a steel pipe used in the method.

[0006]

The construction of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. Steel pipe 1 provided with water holes 3 and 3 facing B side
The earth retaining wall A by the connection of the above is formed opposite to each other across the construction ground B, the inside of the steel pipe 1 is excavated and excavated. After excavating the construction ground B, excavating and constructing underground structures, etc. in a state where the water holes 3 are closed,
It is characterized in that the water hole 3 is opened.

Further, according to the construction method of claim 2, the steel pipe 1 provided with the water holes 3, 3 facing the back ground C side and the construction ground B side.
A soil retaining wall A is constructed by opposing the construction ground B, excavating and excavating the inside of the steel pipe 1, and a water impervious device 7 that can be opened and closed from the ground is provided in the steel pipe 1. The construction ground B was excavated and excavated in a state where the water hole 3 was closed while the water hole 3 was closed, and a water pipe 13 or a water layer 12 was provided between the water holes 3 and 3 of the opposite retaining wall A and connected. Thereafter, the water blocking hole 7 is opened by the water blocking device 7.

According to the third aspect of the present invention, the steel pipe 1 forming the steel pipe column retaining wall A is provided with water holes 3 and 3 facing the back ground C side and the construction ground B side. At the same time, a water shield device 7 having a pressure balloon 10 capable of opening and closing the water passage hole 3 by expanding and contracting by the operation of injecting and discharging fluid from the ground is provided in the steel pipe 1 so as to be freely inserted and removed. It is characterized by the following.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 and FIGS. 8 and 9 show an embodiment of the process of the present invention and the structure thereof, and FIGS. 6 and 7 show main parts of an embodiment of a steel pipe water permeating apparatus used in the present invention. It is a thing.

In constructing an underground structure or the like, a retaining wall A is formed on the ground on both sides of the construction ground B. In the present invention, a retaining wall formed by connecting sheet piles of steel pipe in a column shape to form a wall shape is used. For the retaining wall A, generally, a steel pipe sheet pile having a joint 2 along the axis of the steel pipe 1 fixed to both opposite outer sides of the steel pipe 1 is sunk in the ground by a hitting method or a digging method. With
They are connected to each other by the joints 2 and 2 (see FIGS. 1 and 2).

In the present invention, as the steel pipe 1 of the steel pipe sheet pile, both sides in the direction crossing the retaining wall A, that is, the back ground C
A water hole 3 having a required diameter is provided at an arbitrary depth position where the permeation of groundwater is expected on the side in contact with the construction ground B and on the side in contact with the construction ground B. In this case, it is preferable that a reinforcing plate 4 is additionally provided at a location where the water passage hole 3 is opened in order to compensate for a cross-sectional loss caused by the water passage hole 3. Further, when the steel pipe sheet pile is laid, particles such as soil and sand are blocked in the water passage hole 3 of the steel pipe 1 as shown in FIG. The water-permeable cap 5 provided with is fitted.

After the formation of the retaining walls A, A, as shown in FIG. 3, the inside of each steel pipe 1 is excavated by a hammer grab or an auger to a position slightly below the water passage hole 3 to discharge the steel pipe 1 to remove the soil. The water shield device 7 is inserted into the hollow steel pipe 1 formed in a hollow.

As shown in FIG. 3, FIG. 4, FIG. 6, and FIG. 7, the water-shielding device 7 is provided with water at the center of a horizontal flow pipe 8 formed shorter than the inner diameter of the steel pipe 1 and at the center. A vertically extending injection / discharge tube 9 for injecting and discharging a fluid of air or air is connected, and a pressure balloon having a diameter reduced as shown in FIGS. 10 is attached in communication with the circulation pipe 8, and the other end of the injection pipe 9 is connected to an injection pump (not shown) installed on the ground or the like.

The water blocking device 7 is inserted at a position where both ends of the flow pipe 8 face the water holes 3. Then, a fluid is injected into the injection pipe 9 from the ground. As a result, FIGS.
As shown in (1), the fluid is injected into the pressure balloons 10, 10 through the flow pipe 8, the pressure balloon 10 expands and expands, and the water flow hole 3 is closed and closed. . Therefore,
The back ground C side and the construction ground B side are impermeable, and the retaining wall A functions as an impermeable wall.

Under the above-described water-blocking condition, the construction ground B is excavated and excavated, and the underground structure D and the like are constructed. Then, the fluid injected into the water shielding device 7 is discharged. Thereby, as shown in FIG. 6, the pressure balloons 10, 10 are contracted to the original state, the two water holes 3 are opened, and the back ground C and the construction ground B are connected to the water holes 3, 3 of the steel pipe 1. It becomes a state in which water can be passed through 3. After the water holes 3 and 3 are opened, the water blocking device 7 may be pulled up from the steel pipe 1 or may be buried and killed, so that the retaining wall A functions as a water permeable wall.

Since the soil retaining wall A has the water permeability function, the groundwater on the back ground C, which is on the upstream side of the groundwater flow, flows into the steel pipe 1 from the water hole 3 of the soil retaining wall A,
It penetrates into the construction ground B from the other water hole 3, passes through the steel pipe 1 from the water holes 3, 3 of the other retaining wall A, and the other back ground C
It will penetrate into. Thereby, the retaining wall A,
The creation and distribution of groundwater that was cut off due to the construction of A will be possible permanently.

FIGS. 8 and 9 show a second embodiment of the means for circulating water between the retaining walls A, A. In the embodiment of FIG. 8, a water-permeable layer in which crushed stones and the like are spread to a required thickness between the opposed water-permeable holes 3 and 3 of the retaining wall A.
11 is to be formed, and an underground structure D is to be constructed thereon. Further, in the embodiment shown in FIG.
Are connected by a communication pipe 12. In the case of these embodiments, the flow of water between the soil retaining walls A, A is performed through the water-permeable layer 11 or the communication pipe 12, so that the flow of water is performed more smoothly and the water to the construction ground B is formed. It can also prevent the adverse effects of distribution.

Further, in the present invention, as shown in FIG. 10, a permeable layer E filled with crushed stone or the like can be provided on the back ground C in contact with the retaining wall A. This permeable layer E
Is not limited to being provided on the entire surface in the longitudinal direction of the retaining wall A,
It may be provided in a fragmentary manner at intervals in the longitudinal direction of the retaining wall A. With the formation of the water permeable layer E, the water flow between the back ground C and the water holes 3 is more effectively performed. In addition, the formation of the permeable layer E allows the water to flow under the underground structure, for example, even when the depth position of the underground water flow is higher than the lower end level of the underground structure B. Regardless, the restoration of water flow can be performed effectively. The provision of the water permeable layer E is described in FIG.
It is also applicable to the embodiment of FIG.

[0019]

As described above, according to the present invention,
A water hole is provided in the steel pipe of the earth retaining wall by the steel pipe column buried in the construction of the underground structure etc., and this water hole is
It can be closed during construction work to provide the retaining wall with a water blocking function, and after the construction is completed, a water hole can be opened to form a water blocking function. It is possible to use the steel pipe column retaining wall as a water-permeable structure. In addition, the switching of the water blocking function and the water passing function of the earth retaining wall can be easily performed by operation from the ground using a simple water blocking device, and the construction can be economically performed.

Then, the groundwater of the ground after the passage of water flows naturally without clogging through the water holes of the steel pipe of the retaining wall,
The restoration and maintenance of the groundwater flow can be performed smoothly without any power, and the surrounding environment can be maintained well.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a retaining wall is formed in an embodiment of the method of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a longitudinal sectional view showing a state where a water barrier device is inserted into the steel pipe.

FIG. 4 is a longitudinal sectional view showing a state in which a water hole of the steel pipe is closed.

FIG. 5 is a longitudinal sectional view showing a state in which water is passed through the retaining wall.

FIG. 6 is a longitudinal sectional view showing a main part of a steel pipe provided with a water passage hole and a main part of a water barrier device inserted into the steel pipe.

FIG. 7 is a longitudinal sectional view showing a state in which the water hole is closed.

FIG. 8 is a longitudinal sectional view showing an embodiment of a means for flowing water between retaining walls.

FIG. 9 is a longitudinal sectional view showing still another embodiment.

FIG. 10 is a longitudinal sectional view showing an embodiment provided with a water-permeable layer.

[Explanation of symbols]

 Reference Signs List A A retaining wall B Construction ground C Back ground D Underground structure E Water permeable layer 1 Steel pipe 3 Water hole 5 Water permeable cap 6 Water permeable material 7 Water shield device 8 Flow pipe 9 Injection pipe 10 Pressure balloon 11 Water layer 12 Communication pipe

Claims (3)

[Claims] An earth retaining wall is formed by connecting steel pipes provided with water holes facing the back ground side and the construction ground side, facing each other across the construction ground, and excavating and discharging inside the steel pipes. Soil
After inserting a water-blocking device that can be opened and closed from the ground into the steel pipe, excavating the construction ground, discharging soil, and constructing underground structures, etc. with the water passage hole closed, then the water-blocking device A method of passing water through a steel pipe column soil retaining wall, characterized in that a water passage hole is opened. 2. A retaining wall formed by connecting steel pipes provided with water holes facing the back ground side and the construction ground side, facing each other across the construction ground, and excavating and discharging the inside of the steel pipes. Soil
Into the steel pipe, a water impervious device that can be opened and closed from the ground is inserted, the construction ground is excavated and the earth is excavated in a state where the water holes are closed, and the water pipes between the water holes in the opposing retaining walls or A method of passing water through a steel pipe column retaining wall, wherein a water passage hole is opened by a water blocking device after a water passage layer is provided and connected. 3. A steel pipe which forms a steel pipe column retaining wall is provided with a water passage hole facing a back ground side and a construction ground side, and is expanded and contracted by a fluid injection and discharge operation from the ground. A water permeation device for a steel pipe used for a steel pipe column retaining wall, wherein a water impermeable device provided with a pressure balloon capable of opening and closing the water passage hole is provided so as to be freely inserted into and removed from the steel pipe.