JP2000220137A - Steel pipe column array earth retaining wall and its water passing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the facility of restoration of underground water and a method for water passing after construction completion by preparing earth retaining blocks at prescribed intervals, forming a connection sheet pile having a joint material provided on a side end, and mutually connecting the earth retaining blocks. SOLUTION: In the construction of an underground structure, an earth retaining wall A is embedded in a support layer or an impervious layer on the ground of both sides sandwiching construction ground to be prepared, fixed on the ground, and after the building frame of the structure is constructed, soil and sand is back-filled. A water passing layer such as gravel and crushed stones is provided at a part of height corresponding to underground water, vibration is applied to a connection sheet pile 8 to cut a joint material of connection with the ground and the connection sheet pile 8 is pulled. A water passing part connecting the rear face ground of the earth retaining wall A and the ground of a construction side is formed between earth retaining blocks 1, 1, and the pulled connection sheet pile 8 is repeatedly used for next execution. Thereby the water passing part communicating with underground water is provided, and the earth retaining wall A functioning as the earth retaining wall and an impervious wall during construction can be made a water passing wall restoring underground water after construction completion.

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 structure, 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 utilizes a steel pipe column retaining wall which has many advantages such as good workability and excellent strength and waterproofness. The purpose of this project is to provide a structure that can easily restore the groundwater vein, and to provide a new method for passing water through the retaining wall.

[0006]

The construction of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The retaining wall of claim 1 is filled with soil cement 6. In the excavation hole 7, a plurality of steel pipe sheet piles 2 provided with coupling materials 4 and 5 on a steel pipe 3 are connected and laid to form a retaining block 1 at a required interval, and a coupling material 9b is provided at a side end. Is formed, and the retaining wall blocks 1, 1 are connected to each other by the connecting sheet pile 8 via their joint members 4, 5, 9b.

According to a second aspect of the present invention, in the construction in which the steel pipe column row retaining wall A formed with the construction ground interposed therebetween blocks the groundwater vein C, the water penetration method according to the second aspect of the present invention is applied to the excavation hole 7 filled with the soil cement 6. A plurality of steel pipe sheet piles 2 are connected and laid, and an earth retaining block 1 is formed at a predetermined interval, and a connection sheet pile 8 is connected to the ground between the earth retaining blocks 1 and 1 while being connected to the earth retaining block 1. Build in, retaining block 1
After the construction of the underground structure B, the connecting sheet pile 8 is pulled out from the ground, and the soil retaining blocks 1 and 1 are used as the water passing section 10 to restore the groundwater vein. It is characterized by aiming.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a state in which a retaining wall is formed in the construction of an underground structure or the like, and FIG. 3 is an enlarged view of a core material portion in the retaining wall. 4 and 5 show a state in which a water passage for restoring groundwater veins is opened on the retaining wall.

As shown in FIG. 1 and FIG. 2, the steel pipe column row retaining wall A of the present invention is formed on the ground on both sides of the construction ground when constructing an underground structure or the like. You. Conventionally, steel pipe column retaining walls are conventionally used as core materials using steel pipe sheet piles provided with joints on both outer sides of the steel pipes, and while connecting these with each other with joints, inserting the excavation holes filled with soil cement, It is laid and built. This method is called a so-called ONS method.

The retaining wall A in the present invention is constructed by changing the structure of the conventional steel tube column retaining wall, and providing a water passage 10 to various parts of the retaining wall A.
(See FIG. 5). That is, in the retaining wall A of the present invention, as shown in FIG. 2, the retaining wall is not formed as a series, but the retaining blocks 1 and 1 composed of the core material and the cement 6 connected to the plurality of steel pipe sheet piles 2. They are connected to each other by connecting sheet piles 8.

The soil retaining block 1 is filled with soil cement 6 into a continuous excavation hole 7 by means of a screw auger, and a plurality of steel pipe sheet piles 2 and 2 are filled therein, similarly to the construction of a conventional steel pipe column retaining wall. Are formed while being connected to each other via joint members 4 and 5. This earth retaining block 1
The retaining walls A to be constructed are arranged in a row at a predetermined interval in the length direction.

The connecting sheet pile 8 is provided with joint members 9b, 9b which are fitted to the joint members 4, 5 of the steel pipe sheet pile 2 at both longitudinal ends of a strip-shaped sheet pile main body 9a formed to be long in the vertical direction. ing. The connecting sheet pile 8 is subjected to a lubricating material treatment for facilitating installation and pulling out of the ground. Various methods are conceivable for this lubricating material treatment. For example, a polymer absorbent is fixed to the surface of the connection sheet pile 8 by spraying or the like, and a protective material such as a nonwoven fabric is adhered thereon,
What is necessary is just to stick a polyethylene sheet or put the whole connection sheet pile 8 in a polyethylene bag and use it.

When the soil cement 6 of the earth retaining blocks 1 and 1 which are successively formed is in an unhardened state, the connection sheet piles 8 connect the joint members 9b and 9b on both sides to the adjacent steel pipe sheet piles 2 respectively. It is fitted to the joint material 4 (5) and is directly built into the ground between the retaining blocks 1 and 1 by press-fitting, hitting or the like. As a result, the retaining wall A is formed by connecting the retaining blocks 1, 1 and the connection sheet piles 8, 8.

The joint members 4 and 5 of the steel sheet pile 2 are male and female, but are not limited to this as long as they can be fitted to each other. The joint member 9a may have any shape and structure that can be fitted with the joint members 4 and 5. In the embodiment shown in the drawings, the retaining block 1 is formed by connecting two steel pipe sheet piles 2 each serving as a core material, but the present invention is not limited to this. In consideration of the above point, the number of connected steel pipe sheet piles 2 in the retaining block 1 (the length of the retaining block 1) is selected. Also, the length of the connection sheet pile 8 is appropriately selected in consideration of the above conditions and the water flow capacity.

In the present invention, the above-mentioned retaining wall A is used, and after the role as the retaining wall is finished, a water passage section is opened in the retaining wall A to restore the groundwater vein.

When constructing an underground structure, as shown in FIGS. 1 and 2,
The above retaining wall A is embedded in the support layer or the impermeable layer D and formed. At that time, the groundwater vein C existing between the ground surface and the support layer or the impermeable layer D is often cut off. The present invention is applied to such a case.

After the formation of the retaining wall A, as shown in FIG.
The ground between the opposed earth retaining walls A, A is excavated and excavated to the lower end of the groundwater vein C or a position (a) beyond the lower end, and a ground anchor (not shown) is driven in, or a shoring (cutting) is performed. The retaining wall A is fixed to the ground with the beam protruding). Then, when the construction of the frame of the structure B is completed, as shown in FIG.
Backfill the soil to the bottom of the building. At this time, the height corresponding to the groundwater vein C is in
Is provided.

Next, vibration is applied to the connection sheet pile 8 to cut off the joint members 5, 9b connected to the ground, and the connection sheet pile 8 is pulled out of the ground using a hydraulic device or the like. At this time, since the connection sheet pile 8 is subjected to a slippery treatment, the drawing work is easily performed. By pulling out the connecting sheet pile 8, a water-permeable portion 10 is formed between the earth retaining blocks 1 and 1 where the ground behind the earth retaining wall A and the earth on the construction side are connected, and Therefore, the flow of water in the groundwater vein C is restored through the water passage portions 10 and 10 of the soil retaining walls A and the water passage layer 11. If the pulled out connection sheet pile 8 is subjected to slippery pretreatment again, it can be used repeatedly for the next construction.

In the above embodiment, the groundwater vein has a single layer. However, the method of the present invention can also be applied to a case where a plurality of layers of groundwater vein exist above and below.

[0020]

As described above, according to the present invention,
Conventionally, in the construction of underground structures, etc., a steel pipe column lined retaining wall that is buried as a highly impermeable retaining wall is used, a part of it is replaced with a connection sheet pile, and this is pulled out to communicate with the groundwater vein. The construction of a water-passing section that allows the building to function as a retaining wall during construction, and as a water-permeable wall that restores groundwater veins after construction is completed. Can be demonstrated.

The restoration of the groundwater vein can be easily and economically carried out from the ground by using a connection sheet pile which has been pre-processed easily and with the use of a conventional construction machine. Since the connection sheet pile can be used repeatedly, the construction cost can be further reduced.

Further, the retaining wall of the present invention is not limited to the one for restoring the groundwater vein, but can also be applied as a retaining wall which is usually buried.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state where a steel pipe column retaining wall is formed.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged plan view showing a connection example of a steel pipe sheet pile and a connection sheet pile.

FIG. 4 is a longitudinal sectional view showing a state in which a connection sheet pile is pulled out to form a water passage portion.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 Reference Signs List A Steel column pillar retaining wall B Underground structure C Underground water vein D Support layer 1 Retaining block 2 Steel pipe sheet pile Steel pipe 4, 5 Joint material 6 Soil cement 7 Drilling hole 8 Connection sheet pile 9a Sheet pile body 9b Joint material 10 Water flow section 11 Water flow layer

 ──────────────────────────────────────────────────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 AA07 EA02 EA15 FB03 FB14 FC02 FC10 GB05 GC11 GD03 GE04 GE07 GE15

Claims (2)

[Claims] Claims 1. In a borehole filled with soil cement,
A plurality of steel pipe sheet piles provided with a joint material on a steel pipe are connected and laid to form a retaining block formed at a predetermined interval, and a connection sheet pile provided with a coupling material on a side end is formed, and each retaining wall block is formed. A steel pipe column retaining wall, wherein the steel pipe columns are connected to each other by connecting sheet piles via their joint members. 2. A retaining block formed by connecting and sinking a plurality of steel pipe sheet piles into an excavation hole filled with soil cement, in a construction in which a steel pipe column retaining wall formed across a construction ground blocks a groundwater vein. At the required intervals, and connecting piles are erected on the ground between the retaining blocks while being connected to the retaining blocks to form a retaining wall consisting of the retaining blocks and the connecting sheet piles. After the construction of the construction, the connecting sheet piles are pulled out from the ground to make the water passage between the retaining blocks and restore the groundwater vein.