JPH1121878A - Constructing method for water passage using sheating wall with steel pipe columns and steel pipe member for use in it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a structure which can make restitution of water using a sheathing wall of steel pipe columns. SOLUTION: Sheathing walls A of steel pipe columns are built in such a way as pinching the construction ground. As a steel pipe member 1 for use in it, a water passage pipe 6 in communication with the back ground C and construction ground B is furnished on steel pipe 2. The water passage pipe 6 is furnished internally with a packer 10 which is expanded and contracted by injection and exhaust of fluid from upon the ground. Under construction, the packer is expanded while the pipe 6 is choked, and after the end of the works, the packer is contracted while the pipe 6 is opened so that water passage is established between the back grounds C of the two sheathing walls A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a structure capable of restoring the flow of groundwater using a steel pipe column retaining wall formed in the construction of an underground structure or the like, and a steel pipe member used therefor. It is about.

[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 utilizes a steel pipe column-lined retaining wall having many advantages such as good workability, excellent strength and excellent water shielding. Within the range, the earth retaining wall is provided with a water flow function by operation from the ground, and it is possible to provide a construction method of a structure excellent in economy and workability, which can restore the groundwater flow, and a steel pipe member used therefor. It is assumed that.

[0006]

The construction of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. In the construction of the steel pipe column soil retaining wall A to be constructed, the steel pipe 2 used for the soil retaining wall A is provided with a water pipe 6 from the construction ground B to the back ground C, which can be closed and opened by operation from the ground. The construction of the earth retaining wall A, the construction of the construction ground B, the excavation and the construction of the underground structure are performed with the water pipe 6 closed, and then the water pipe 6 is opened. It is a feature.

In the construction method of the second aspect, in the construction of the steel pipe column soil retaining wall A formed with the construction ground B interposed therebetween, the steel pipe 2 used for the soil retaining wall A is attached to the steel ground 2 from the construction ground B to the rear ground C. , A drainage pipe 6 that can be closed and opened by operation from the ground is provided, a retaining wall A is created, and the construction ground is excavated and discharged with the drainage pipe 6 closed, and the opposite retaining After the water pipes 12 or the water layer 11 are provided and connected between the water pipes 6 and 6 of the walls A, A, the water pipe 6 is opened.

The steel pipe member according to claim 3 is a steel pipe member,
At a depth position where permeation of groundwater is expected, a water passage pipe 6 having filter media 7 attached to both ends is provided across the steel pipe 2, and inside the water pipe 6, a fluid from outside the steel pipe 2 is provided. Injection,
A packer 10 that expands and contracts upon discharge to close and open the water pipe 6 is provided.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 and 10 to 10
FIG. 12 shows an embodiment of the construction process and the structure of the water passage method according to the present invention, and FIGS. 5 to 9 show embodiments of a steel pipe member used therein.

[0010] When constructing the underground structure D and the like, a steel pipe column retaining wall (hereinafter referred to as retaining wall) A is formed on the ground on both sides of the construction ground B. As is conventionally known, the earth retaining wall A is formed by connecting the joint members 3 and 3 to opposing outer surfaces.
While the steel pipe members 1 provided with the joints are connected to each other by fitting the joint members 3 with each other, the steel pipe members 1 are set in the excavation holes 4 filled with the soil cement 5. This method is known as the ONS method.

In the present invention, the steel pipe member 1 shown in FIGS. 5 to 7 is used. That is, the steel pipe 2 is traversed from the construction ground B side to the back ground C side at a depth position under which the groundwater is expected to permeate below the steel pipe 2 provided with the conventional joint members 3 and both ends are excavated. A water pipe 6 having a required diameter is provided which protrudes to a length almost reaching the outer periphery of the hole 4.
At both open ends of the water pipe 6, a filter member 7 such as a rope or the like, which can block particles such as earth and sand but is permeable to water, is attached.

A small-diameter pipe 8 extending upward through the steel pipe 2 is connected to the water pipe 6.
A flow tube 9 connected to a pump (not shown) for supplying a fluid such as water or air, which is provided on the ground, is inserted, and the distal end thereof communicates with a packer 10 provided inside a water passage pipe 6. Then, as shown in FIG. 6, the packer 10 can expand and expand the entire inside of the water passage pipe 6 to close the entire surface of the filter medium 7 by injecting the fluid from the flow tube 9, and furthermore, inject the injected fluid. By discharging the fluid, FIG.
As shown in FIG. 9, the upper part of the water pipe 6 communicating with the distribution tube 9 is contracted into a small size, the blockage of the filter medium 7 is released, and the inside of the water pipe 6 is filtered through the filter materials 7 at both ends. Water is allowed to pass through.

After the formation of the retaining walls A, A, as described above,
In a state where the fluid is injected into the flow tube 9 to expand and expand the packer 10 and the flow of water through the water flow pipe 6 is cut off, FIG.
As shown in (1), excavation and discharge of the construction ground B are performed, and an underground structure D is constructed.

After the construction of the underground structure D is completed, FIG.
As shown in FIG. 9, when the fluid is discharged from the flow tube 9 and the packer 10 is contracted, the flow of water in the water pipe 6 can be freely performed. Thereby, the back ground C
And the construction ground B can pass water through the water pipe 6 of the steel pipe member 1 of the retaining walls A, A, thereby exhibiting a water passing function. As a result, the groundwater on the back ground C on the upstream side of the groundwater penetrates into the construction ground B through the water pipe 6 on one of the retaining walls, passes through the water pipe 6 on the other retaining wall A, and the other. It will penetrate into the back ground C. As a result, the distribution and condensing of groundwater blocked by the formation of the retaining walls A, A can be performed permanently.

FIGS. 10 and 11 show a second embodiment of the means for circulating water between the retaining walls A, A. FIG. In the embodiment shown in FIG. 10, a water-permeable layer 11 in which crushed stones and the like are spread to a required thickness is formed between opposed water-permeable pipes 6 and 6 of the retaining wall A, and an underground structure D is constructed thereon. Is what you do. In the embodiment shown in FIG. 11, the water pipes 6 and 6 facing each other are connected by the communication pipe 12 before the construction of the underground structure D. 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.

In the present invention, as shown in FIG. 12, 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 pipe 6 is more effectively performed. Further, the formation of the permeable layer E allows water to flow under the underground structure even when the depth position of the underground water flow is higher than the lower end level of the underground structure B, for example.
Regardless of the position of the groundwater flow, restoration of water flow can be performed efficiently. It should be noted that the provision of the permeable layer E is shown in FIG.
It is also applicable to the embodiments of FIGS.

[0017]

As described above, according to the present invention,
Conventionally, a steel pipe column soil retaining wall that is buried as a highly water-impervious retaining wall can be used to cut off water between the back ground side and the construction ground side by operating from the ground using the steel pipe. By doing so, it can function as a water impervious wall at the time of construction, and it can also function as a retaining wall that can be condensed after construction is completed. It can be constructed economically as a water-permeable structure with excellent retaining walls.

[0018] The steel pipe member used for this is simply a steel pipe used for a steel pipe column retaining wall, in which a water pipe and a packer connected to a distribution pipe extending outside the pipe are installed. Since it is only a simple mechanism added, it is easy to handle, can be operated reliably, and can be manufactured at low cost.

[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 the construction ground is excavated and discharged.

FIG. 4 is a longitudinal sectional view after the construction of the underground structure.

FIG. 5 is a half sectional side view of a steel pipe member.

FIG. 6 is a partially enlarged side view of the main part.

FIG. 7 is a front view of the main part.

FIG. 8 is a half cutaway side view of the relevant part, showing a state where the packer is contracted.

FIG. 9 is a front sectional view of the same.

FIG. 10 is a longitudinal sectional view showing an embodiment of another embodiment of the method of the present invention.

FIG. 11 is a longitudinal sectional view showing still another embodiment.

FIG. 12 is a longitudinal sectional view showing still another embodiment.

[Explanation of symbols]

 A Retaining wall B Construction ground C Back ground D Underground structure E Permeable layer 1 Steel pipe member 2 Steel pipe 4 Drilling hole 5 Soil cement 6 Water flow pipe 7 Filter media 10 Packer 11 Water flow layer 12 Communication pipe

Claims (3)

[Claims] Claims: 1. In the construction of a steel pipe column retaining wall formed across a construction ground, steel pipes used for the retaining wall can be closed and opened by an operation from the ground from the construction ground to the back ground. Establish a drainage pipe, construct a retaining wall, perform construction from excavation of the construction ground, excavation to construction of underground structures, etc. with the drainage pipe closed, and then open the drainage pipe A water-passing method using steel pipe column soil retaining walls. 2. In the construction of a steel column pillar retaining wall formed across a construction ground, the steel pipe used for the retaining wall can be closed and opened by operation from the ground from the construction ground to the back ground. Established drainage pipes, constructed earth retaining walls, excavated and drained the construction ground with the drainage pipes closed,
A water-passing method using a steel-column-column soil retaining wall, characterized in that a water-passing pipe or a water-permeable layer is provided between and connected to water-passing pipes of opposed soil walls, and then the water-flow pipe is opened. 3. A water pipe having a filter material attached to both ends thereof is provided across the steel pipe at a depth of the steel pipe where the penetration of groundwater is expected. A steel pipe member for use in a steel pipe column retaining wall, comprising a packer which expands and contracts by injecting and discharging a fluid to close and open a water pipe.