KR-20260067044-A - Method for constructing a retaining wall using PC sleepers

Abstract

A method for constructing a retaining wall using discarded PC sleepers is disclosed, which can drastically reduce the costs associated with the storage and disposal of discarded sleepers by utilizing discarded PC sleepers that are difficult to dispose of as materials at the construction site. The above method for constructing an earth retaining wall using discarded PC sleepers comprises: a drilling step of forming holes spaced apart by drilling; a sheet pile insertion step of inserting sheet piles into each of the spaced holes; a cutoff wall installation step of installing a cutoff wall along the back of the spaced sheet piles; a first excavation step of excavating to a first depth between the front of the spaced sheet piles and the spaced sheet piles; a first earth retaining wall formation step of forming an earth retaining wall to the first depth by inserting both ends of the discarded PC sleepers into the sheet piles on both sides and sequentially installing the discarded PC sleepers in layers; a second excavation step of lowering the discarded PC sleepers installed on the sheet piles while excavating to a second depth between the front of the spaced sheet piles and the spaced sheet piles; and a method of forming an earth retaining wall to the second depth by inserting both ends of the discarded PC sleepers into the sheet piles on both sides and sequentially installing the discarded PC sleepers in layers. It is configured to include a second retaining wall forming step for forming a retaining wall.

Inventors

• 양성철
• 임유진

Assignees

• 홍익대학교세종캠퍼스산학협력단
• 배재대학교 산학협력단

Dates

Publication Date

20260512

Application Date

20241105

Claims (6)

1. A drilling step to form holes spaced apart by drilling; A step of inserting king piles into the holes spaced apart, respectively; A watertight wall installation step of installing a watertight wall along the back surface of the above-mentioned king piles arranged at intervals; A first excavation step of excavating to a first depth between the front of the above-mentioned king piles arranged at intervals and the above-mentioned king piles; A first earth retaining wall formation step of inserting both ends of discarded PC sleepers into the aforementioned king piles on both sides and sequentially installing the discarded PC sleepers in layers to form an earth retaining wall up to the first depth; A second excavation step of lowering the PC discarded sleepers installed on the king piles while excavating to a second depth between the front of the king piles arranged at intervals and the king piles; and A method for constructing a retaining wall using discarded PC sleepers, characterized by including a second retaining wall formation step in which the ends of the discarded PC sleepers are inserted into the aforementioned king piles on both sides and the discarded PC sleepers are installed sequentially in layers to form a retaining wall up to the aforementioned second depth.
2. A method for constructing an earth retaining wall using discarded PC sleepers, characterized in that, in claim 1, it includes a drain board installation step of installing a drain board on the above-mentioned king pile and a geotextile installation step of installing a geotextile on the front side of the above-mentioned drain board.
3. A method for constructing a retaining wall using discarded PC sleepers according to claim 1, wherein the first retaining wall forming step and the second retaining wall forming step are characterized in that the fixing anchor for rail installation installed on the discarded PC sleeper faces the back side.
4. A method for constructing a retaining wall using discarded PC sleepers, characterized in that, in claim 1, the first retaining wall forming step and the second retaining wall forming step include installing the discarded PC sleepers such that the rail fixing anchors installed on the discarded PC sleepers alternately face the back and the front.
5. A method for constructing an earth retaining wall using discarded PC sleepers, characterized in that, in claim 3 or 4, the reinforcing bar installation step of aligning the discarded PC sleepers arranged in layers by inserting reinforcing bars into the rail fixing anchor facing the back surface.
6. A method for constructing an earth retaining wall according to claim 5, wherein the reinforcing bar installation step comprises inserting reinforcing bars into a plurality of rail fixing anchors and fixing clamps on the outer surface of the reinforcing bars so that the clamps can be caught on the rail fixing anchors or support the rail fixing anchors.

Description

Method for constructing a retaining wall using PC sleepers The present invention relates to an improvement in a method for constructing a retaining wall, and in particular, to an improvement in a method for constructing a retaining wall that is suitable for application to the construction of a retaining wall that must be installed in places where excavation work is required. Generally, the method for constructing a retaining wall involves installing H-shaped steel king piles and then installing wooden or steel retaining boards on the king piles to prevent soil from the back side from flowing into the work area during excavation. That is, the conventional earth retaining wall (30) construction is formed by drilling holes at regular intervals along the edge of the work area, driving in H-shaped steel piles (10) as shown in FIG. 1, and inserting wooden or steel earth retaining plates (20) between adjacent piles (10). When wood is used as the earth retaining plate (20), it lacks the strength to withstand earth pressure, so it is not suitable for use in places with high earth pressure, and there is a risk of damage, so the thickness must be increased to prevent damage. When steel is used as the earth retaining plate (20), it has a high strength to withstand earth pressure, but it is heavy and difficult to handle, and the cost of manufacturing the earth retaining plate (20) is high. Also, since the king piles (10) must be installed closely at narrow intervals of 1 to 2 meters, a large number of king piles (10) are required, and the number of times the king piles (10) are installed also increases. Meanwhile, discarded PC sleepers are mostly installed on railway tracks to support rails and are removed after reaching the end of their lifespan; as of 2001, approximately 500,000 to 1 million discarded sleepers were being stored in idle railway facility sites in Korea. Now, more than 20 years later, it is estimated that millions of discarded PC sleepers are being stored in idle railway facility sites. As part of the utilization plan for discarded PC sleepers as described above, attempts are being made to crush them using equipment such as hydraulic breakers and use them as aggregate. However, because discarded PC sleepers are made of concrete with embedded rebar, they are very strong, so crushing them to produce aggregate is time-consuming and expensive, and it is difficult to produce them to meet the demand required by the industry. In some cases, it also causes problems such as damage to crushing equipment like hydraulic breakers. In addition, crushing costs 20,000 to 30,000 won per ton and is difficult, so there are practical difficulties in producing recycled aggregate through intermediate processing companies. Furthermore, discarded PC sleepers are designated as hazardous waste under the Waste Management Act, making their disposal very difficult as they cannot be used as structural materials for finished products due to legal restrictions. Accordingly, various ways to utilize discarded PC sleepers other than as aggregate are being explored. As for prior art related to the utilization of discarded PC sleepers, a method of constructing a retaining wall by connecting discarded sleepers arranged parallel to each other using horizontal fixing pins, fixing bolts, and nuts, and arranging them in layers, is disclosed in Publication No. 10-2007-0060708 (Title of Invention: Concrete Discarded Sleeper Retaining Wall, Inventor: Kim Jong-gyeon). In addition, a method of constructing a retaining wall by stacking discarded sleepers in a grid pattern is disclosed in the registered patent publication No. 10-0355429 (Title of invention: Grid retaining wall using discarded sleepers and method of constructing the same, Inventor: Kim Yong-eon). However, the above conventional technology is suitable for constructing small-scale retaining walls with low earth pressure, and is a method for utilizing waste sleepers that cannot be applied to retaining walls at excavation sites where earth pressure is very high. FIG. 1 is a perspective view illustrating the configuration of a general earth retaining wall, FIG. 2 is a rear perspective view of an earth retaining wall to explain the process of a method for constructing an earth retaining wall using discarded PC sleepers according to the present invention. FIG. 3 is a plan view showing an example of installing a cutoff wall on the back of an earth retaining wall. FIG. 4 is a plan view of a retaining wall to explain the process of a method for constructing a retaining wall using discarded PC sleepers according to the present invention. FIG. 5 is a cross-sectional perspective view according to II of FIG. 4, FIG. 6 is a process diagram showing the construction process of a retaining wall construction method using discarded PC sleepers according to the present invention. FIG. 7 is a drawing for explaining a modified example of a method for constructing an earth retaining wall using discarded PC sle