JPH0340169B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for reinforcing a sheet pile wall structure, and more specifically, a method suitably used when reinforcing an existing sheet pile structure. This relates to a reinforcing method.

[Prior art]

Conventionally, sheet pile wall structures have been widely used as temporary structures such as earth retaining walls and cofferdams, or as part of permanent structures such as mooring quays and seawalls.

This sheet pile wall structure is constructed by driving a large number of horizontally arranged sheet piles, such as steel sheet piles and steel pipe sheet piles, to a predetermined depth to form a wall surface.The upper part of the wall surface and the back support are connected using fixed tension members such as tie rods. The structure is such that the pressure acting on the sheet pile wall is supported by the earth pressure acting on the backing work and the embedded part of the steel sheet pile, but when the cross-sectional strength of the sheet pile wall decreases due to corrosion etc. When the structure is used as a mooring quay and the front surface of the sheet pile wall is dredged to deepen the water depth, it is necessary to reinforce the sheet pile wall.

[Problem that the invention seeks to solve]

Therefore, as a means of reinforcing such an existing sheet pile wall structure, there are methods such as removing the existing sheet pile wall and rebuilding it, or forming a large sheet pile wall in front and wrapping it around the existing sheet pile wall. However, both methods have the problem of large-scale construction and high costs.Especially in the case of moored berths, the surrounding berths may become unusable, or plans due to changes in the normal line of the berth may occur. The drawback was that there were problems with procedures.

In addition, after removing the superstructure (apron) of the existing sheet pile wall structure and excavating a large amount of backfill earth and sand,
It is possible to add additional anchoring tension members, but in this case, it is not only extremely troublesome, but also dangerous, as the work must be carried out while taking into consideration the balance between the existing anchorage tension members and the backing work, so it is not practical. The problem was that it was not.

[Means for solving problems]

Therefore, in order to solve the above-mentioned problems, this invention reaches from the back of the backing of the existing sheet pile wall structure to the lower part of the mounting position of the existing tension anchoring member on the back of the sheet pile wall through this backing and backfilling earth. A pore is bored, then a through hole communicating with the pore is opened in the sheet pile wall, a tension anchoring member is inserted into the pore and the through hole, and the end of the tension anchoring member on the sheet pile side is connected to the shoring material. The aim is to strengthen the structure by fixing it to the sheet pile wall via the bolt, and by pulling the other end and fixing it to a predetermined location on the backing work.

In this case, when drilling a small hole from the back of the support work, it is effective to excavate a part of the back of the support work because the anchoring angle of the tension anchoring member to be added can be made gentler. Further, the pores can be opened from either the front or back side of the sheet pile wall.

[Effect]

In the method for reinforcing a sheet pile wall structure according to the present invention,
Reinforcement is performed by making the existing anchoring tension member and the newly installed anchoring tension member work together.

〔Example〕

Next, a preferred embodiment of the method for reinforcing a sheet pile wall structure according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows an existing mooring quay as a sheet pile wall structure.This mooring quay is constructed by driving a large number of horizontally arranged steel sheet piles 1 into the seabed to form a quay surface 3. Backfill earth and sand 5
A support work 7 is installed through the support work 7 and the quay surface 3.
An apron 11 is installed on top of the backfill earth and sand 5.

When reinforcing the mooring quay constructed in this manner, first, the apron portion behind the upper concrete 9 is removed, backfill earth and sand 5 is excavated to a predetermined depth, and a hole drill 13 is installed (see Figure 2). .
In this case, this excavation step can be omitted if the mounting position on the backing work side is set upward.

Next, a hole 15 at a predetermined angle is drilled at the back of the quay wall through the backfill 7 and the backfilling earth and sand 5 using the drilling machine 13, reaching below the attachment position of the tie rod 9. When the back surface is reached, a through hole 17 is opened in the quay surface 3 at the same angle (see Fig. 3). Further, as a method of opening the through hole 17, it is also possible to open it from the front of the quay surface 3 using an appropriate drilling machine.

Next, after moving the hole drilling machine 13, a newly installed tie rod 19 is inserted from the back side of the backing work 7 through the small hole 15 and the through hole 17, and this tie rod 19 is inserted.
By fixing one end part to the quay wall surface 3 via the belly riser 21 using an appropriate fixture (not shown), and fixing the other end part to the support work 7 while being pulled by an appropriate tension device. After the quay wall surface 3 and the backing work 7 are tied together and the excavated portion is covered with soil, an apron is formed (see Fig. 4).

According to this method of reinforcing a moored quay, it is simple and allows the quay to be used even during the construction period because it only requires the addition of fixed tension members, and there is no movement of the quay's normal line, and the construction cost is low and the space can be saved. be able to achieve the objectives of the term.

〔effect〕

As mentioned earlier, the method of the present invention only involves drilling holes in the support work, backfilling earth and sand, and sheet pile walls and adding anchorage tension members, so not only can reinforcement be extremely safe and easy, but also the backfilling can be done easily. Since there is no need to remove earth and sand, the effect of bending stress due to backfilling earth and sand on the added anchorage tension member is small, and therefore, there is no need for a ring joint, and reliable reinforcement can be achieved. have

Although the method of reinforcing a mooring quay has been described above as a preferred embodiment of the method of the present invention, the method of the present invention is not limited to this embodiment. Through-holes and pores may be drilled to reach the wall, and in the case of self-supporting sheet pile wall structures, this can be used as an effective reinforcement method in conjunction with the installation of new buttresses. Furthermore, tie ropes can be used as anchorage tension members. It goes without saying that various changes can be made without departing from the spirit of the invention, such as using the following.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an existing mooring quay in the case of carrying out the method of the present invention, and FIGS. 2 to 4 are explanatory diagrams of a method for reinforcing the existing mooring quay shown in FIG. 1. 1: steel sheet pile, 3: quay surface, 5: backfill earth and sand,
7: Standing work, 9: Tie rod, 11: Apron,
13: Hole drilling machine, 15: Pore, 17: Through hole, 19:
Tirod, 21: Get up on your stomach.

Claims (1)

[Scope of Claims] 1. A fine hole is drilled from the back of the support work through the support work and backfilling soil to reach the lower part of the mounting position of the existing tension anchoring member on the back surface of the sheet pile wall, and then the fine hole is drilled in the sheet pile wall. A through hole communicating with the hole is opened, a tension fixing member is inserted into the small hole and the through hole, and the end of the tension fixing member on the sheet pile side is fixed to the sheet pile wall via the shoring material, and the other end is fixed to the sheet pile wall. A method for reinforcing a sheet pile wall structure, the method comprising tensioning and fixing the sheet pile wall structure at a predetermined location on a support structure. 2. The method for reinforcing a sheet pile wall structure according to claim 1, which comprises excavating the back of the backing in advance when drilling the pores from the back of the backing. 3. The method for reinforcing a sheet pile wall structure according to claim 1 or 2, wherein the through hole is opened from the front side of the sheet pile wall. 4. The method for reinforcing a sheet pile wall structure according to claim 1 or 2, wherein the through hole is opened directly from the back side of the sheet pile wall when boring the small hole from the back side of the support work.