JP2000220136A - Underground water vein restoring method by retaining wall with steel pipe column strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new method capable of restoring an underground water vein by forming portions permitting water passage through a retaining wall by performing a relatively easy work after utilizing a retaining wall with steel pipe column strip which is very advantageous such as good workability, good yield strength and excellent water stopping performance. SOLUTION: A pretreatment is given to make easier to pull out after construction work for part of steel pipe column strip when constructing retaining walls A, A with steel pipe column strip by locating a construction ground zone between the walls. Then, after constructing an underground structure B, the pretreated steel pipes 1a is pulled out, soil cement 5 is excavated and removed around the pipe pulled out, cobble, crushed stones or the like are placed in the hole created by the above, water passing columnar bodies 11 for communicating with water veins C2, C3 interrupted by the retaining walls A, A are formed and water passing layers 12 provided between the water passing columnar bodies 11, 11 of both the retaining walls A, 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 restoring groundwater veins cut off during construction of a steel pipe column retaining wall formed for retaining and stopping water when constructing an underground structure or the like. Things.

[0002]

2. Description of the Related Art In an underground structure or the like, an earth retaining wall is constructed around a construction area for the purpose of retaining soil and stopping water, and excavation of an underground portion and construction of a structure are performed. The earth retaining wall will be buried after the construction is completed. Therefore, the groundwater vein is semi-permanently blocked. As a result, problems such as the formation of wetlands on the upstream side of the retaining wall due to the rise of the groundwater level and the subsidence due to the decrease of the groundwater level on the downstream side will occur.

[0003] In order to solve this problem, in the underground continuous retaining wall using reinforced concrete, a method of passing water by a pump or a pipe (recharge type), a method of connecting the facing retaining wall with a bypass pipe, and the like have been proposed. Has been implemented. In addition, in the case of steel pipe column retaining walls, it is difficult to change the structure because prefabricated steel pipes are used, and soil cement with a water-blocking function also exists around the steel pipes and joints. Although it has been considered unsuitable as a structure for restoring the image, research and development have been advanced in recent years, and many proposals have been made (see Japanese Patent Application Laid-Open No. 9-228360).

[0004]

However, in the method of passing water through a reinforced concrete retaining wall, not only is the construction complicated and costly, but also it is difficult to restore groundwater veins deeper than the root. is there. Also, in the method of passing water through the steel pipe column soil retaining wall, water penetration holes are provided in the steel pipe,
It is necessary to remove the soil cement wrapping the steel pipe, and there is a problem that the construction becomes large.

The present invention has been made in order to solve the above-mentioned problems, and is intended for a steel pipe column retaining wall having many advantages, such as good workability and excellent strength and waterproofness. Later, a relatively easy operation is performed to form a portion through which water can pass through the retaining wall, and to provide a new construction method capable of restoring the groundwater vein.

[0006]

Means for Solving the Problems To achieve the above object,
For the configuration of the present invention, refer to the drawings corresponding to the embodiments.
In the light of the above, the present invention is constructed with the construction ground
Steel pipe pillar retaining wall A, A is groundwater vein C₁ , C_Two , C_Three To
In the construction to be cut off, a part of the steel pipe of the steel pipe column soil retaining wall A
The sheet pile 1a is subjected to a pre-pullable pretreatment and laid down,
After construction of underground structure B, steel pipe sheet pile subjected to the above pretreatment
1a, pull out the soil cement 5 in the subsidence
After excavation and removal, gravel, crushed stone, etc.
_Two , C_Three And a permeable column 11 that communicates with
The permeable columns 11, 11 of the retaining walls A, A
It is characterized by the following.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is directed to a steel pipe column retaining wall formed for retaining soil and stopping water when constructing an underground structure or the like, and forming a water-passing portion communicating with the groundwater vein interrupted by the formation on the steel pipe column retaining wall. It is to let.

When constructing underground structures, etc., FIG.
As shown in FIG. 2, steel pipe column retaining walls (hereinafter referred to as retaining walls) A are formed on the ground on both sides of the construction ground. As shown in the drawing, the retaining wall is formed by joining the steel pipe sheet piles 1 (1a, 1b, 1c) provided with the joint members 3 and 4 in the longitudinal direction of the opposed outer surfaces of the steel pipe 2 to each other. Is inserted and set in the drilling hole 6 filled with the soil cement 5 while fitting and connecting. And earth retaining wall A
Is formed by blocking groundwater veins C ₁ , C ₂ , and C _3, which extend over a plurality of upper and lower stages, and is embedded in the support layer D below the groundwater veins C ₁ , C ₂ , and C ₃ .

In the present invention, in forming the retaining wall A, every other one of the column-column steel pipe sheet piles is a steel pipe sheet pile 1a which is drawn out after being used as the retaining wall. The steel pipe sheet pile 1a has been subjected to a surface treatment for facilitating the drawing. 10 to 12 show the processing. The example of FIG. 10 shows the joint members 3 and 4 of the steel pipe 2 of the steel pipe sheet pile 1a.
A lubricating material 13 such as a polyurethane rubber-based lubricating material or a calcium silicate swelling material which becomes slippery when containing water is applied by a pre-treatment on the outer surface except for the above. In the example of FIGS. 11 and 12, a lubricating sheet 14 made of polyethylene or the like is adhered over the entire length of the outer surface of the steel pipe 2 at intervals in the week direction.
The lower end of the is fitted with a U-shaped cross-section stopper (made of metal or plastic) 15 and fastened. In addition, in addition to the above-described example, a conventionally known method can be appropriately used for the process for making the surface slippery.

In addition to the above-mentioned slippable steel pipe sheet pile 1a, a steel pipe sheet pile 1b provided with a ground anchor compatible joint as shown in FIGS. 2 and 3 is used. As is already known in Japanese Patent Application Laid-Open No. 5-195526, this joint has a male joint member 3 formed by a normal pipe or the like on one side of a steel pipe 2 and a radial direction of the steel pipe 2 on the other side. The female joint member 4a has a wide width and protrudes from the base member, and a ground anchor fixed to the ground is driven through the female joint member 4a without passing through the steel pipe.

The retaining wall A in the present invention is formed by appropriately arranging the two types of steel pipe sheet piles 1a and 1b and the steel pipe sheet piles 1c provided with commonly used male and female joint members 3 and 4. . The illustrated retaining wall A is composed of the above three types of steel pipe sheet piles 1a, 1
Although b and 1c are sequentially arranged, their use ratio and arrangement order can be appropriately set according to the situation of construction and the like.

After the construction of the retaining wall A, as shown in FIG.
The construction ground between the opposed earth retaining walls A, A is excavated to a required depth position (a), the earth is discharged, and a ground anchor (not shown) is cast to fix the earth retaining wall A to the ground. Then, in order to allow the groundwater veins C1, C2, and C3 blocked by the retaining wall A to temporarily flow during construction, a wide joint material 4a corresponding to a ground anchor is used, and a hole is drilled from the excavated construction site side. Then, while penetrating the water pipe 7 reaching each of the groundwater veins C2, C3, the water pipes 7,
7 are connected to each other by a flexible tube 8 and are communicated with each water vein.

As shown in FIG. 1, the water vein C at a position shallower than the lower end of the building B to be constructed.
For 1, a well is dug from the surface of the ground, and the blocked upstream and downstream sides are connected by a communication pipe 9 to form another groundwater vein C.
2. Reconstruct the running water separately from C3. Thereby, the circulation of each groundwater vein C1, C2, C3 is temporarily secured. Then, in the excavated area between the soil retaining walls A, A, the construction of the structure B (see FIG. 4) is performed.

After the construction of the frame of the structure B is completed, FIG.
First, as shown in FIG. 6, the steel pipe sheet pile 1a for pulling out from the retaining wall A is pulled out. This withdrawal
For example, vibration is applied to the sheet pile 1a to cause
And then pull it out using a hydraulic device or the like.
At this time, since the sliding material is not provided on the inner surface of the steel pipe sheet pile 1a, the soil cement 5 in the steel pipe sheet pile 1a is removed together with the steel pipe sheet pile 1a. Withdrawal hole 10
Is formed.

Next, an auger screw (not shown) is inserted into the extraction hole 10 to excavate and crush the soil cement 5 around the extraction hole 10, and the soil cement is sucked up using a vacuum machine combined with a jet. ,Remove. Then, as shown in FIGS. 7 to 9, a material having good permeability such as gravel and crushed stone is put into the hole from which the soil cement has been removed, and the water-permeable column 11 communicating with each of the groundwater veins C ₂ and C _3. To form
In parallel with this construction, backfill of earth and sand is performed between both retaining walls A, A. At this time, a water layer 12 made of gravel, crushed stone, or the like is provided on a certain level of each of the groundwater veins C ₂ and C ₃ . Thereby, the circulation of the groundwater veins C ₂ and C ₃ interrupted by the formation of the retaining wall A is permanently secured through the water-permeable column 11 and the water-permeable layer 12. The groundwater vein C ₁ above the lower end of the constructed structure B
Is circulated through the communication pipe 9 installed at the beginning.
In addition, when providing the water-permeable layer 12, the flexible tube 8 which has finished the role of temporary water-permeable is collected and reused, but may be buried and killed as it is.

The drawn steel pipe sheet pile 1a is subjected to a surface treatment again to be used for the next construction, or the sliding material adhering to the surface is removed to be reused as a normal steel pipe sheet pile.

[0017]

As described above, according to the present invention,
In the construction of underground structures, etc., steel tube pillar column soil retaining walls which are conventionally buried and buried as highly water-impermeable retaining walls are used, and after constructing the underground structure, a part of the steel pipe sheet pile is pulled out and groundwater vein As a water-permeable column that communicates with the building, it functions as a retaining wall that functions as a retaining wall and impermeable wall during construction, and as a water-permeable wall that restores the groundwater vein after construction is completed. Can be demonstrated.

For the construction of the groundwater vein restoration, a conventional construction machine is used that uses a steel pipe sheet pile that has been easily pre-pulled, and that pulls out, excavates and removes soil cement, and forms a water-permeable column. The series of operations described above can be performed relatively easily and economically. Moreover, since the extracted steel pipe sheet pile can be reused, the construction cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a state in which temporary water-passing means is provided between steel pipe column row retaining walls in one embodiment of the method of the present invention.

FIG. 2 is a plan sectional view of the same.

FIG. 3 is an enlarged plan sectional view of the same part.

FIG. 4 is a longitudinal sectional view showing a state where a part of a steel pipe sheet pile is pulled out.

FIG. 5 is a plan sectional view of the same.

FIG. 6 is an enlarged plan sectional view of the same part.

FIG. 7 is a vertical cross-sectional view showing a groundwater vein restored state.

FIG. 8 is a plan sectional view of the same.

FIG. 9 is an enlarged plan sectional view of the same part.

FIG. 10 is a plan view showing an example of a pretreated steel sheet pile.

FIG. 11 is a perspective view showing another embodiment.

FIG. 12 is a longitudinal sectional view of a main part of a lower end of FIG. 11;

[Explanation of symbols]

A steel column column earth retaining wall B underground structures C _1, C _2, C ₃ underground water vein 1a, 1b, 1c steel sheet pile 2 steel 3,4,4a joint member 5 soil cement 6 borehole 7 passed through the pipe 8 the flexible tube 9 Communication pipe 10 Drilled hole 11 Water-permeable column 12 Water-permeable layer 13 Slipper 14 Slipper sheet 15 Stopper

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koichiro Ishii 2-47, Shikitsu-Higashi 1-chome, Naniwa-ku, Osaka-shi, Osaka Prefecture (72) Inventor Hirohide Sugihara Shikitsu, Naniwa-ku, Osaka-shi, Osaka 2-47 Higashi 1-chome, Kubota Osaka Co., Ltd. (72) Inventor Kenji Noboru 2-47, Shikitsu Higashi, 1-chome, Naniwa-ku, Osaka-shi, Osaka F-term (reference) 2D049 EA01 EA02 EA15 FB03 FB14 FC02 GB05 GC11 GD03 GD05 GE04

Claims (1)

[Claims] Claims: 1. In a construction in which a steel pipe column retaining wall formed across a construction ground blocks a groundwater vein, a part of the steel pipe column pile retaining wall is subjected to a pre-pullable pretreatment and laid down. After constructing the underground structure, pull out the pretreated steel pipe sheet pile, excavate and remove the soil cement in the sinking part, put in gravel, crushed stone, etc., and set up a water-permeable column that communicates with the groundwater vein. A method for restoring groundwater veins in a steel pipe column soil retaining wall, which is constructed and connects the water-permeable columns of both retaining walls.