JPS5944460B2 - Corrosion prevention construction method for steel sheet piles for bank protection - Google Patents

Description

Detailed Description of the Invention The present invention aims to prevent quay walls in rivers, ports, etc. from collapsing due to the influence of water currents, waves, etc. It is constructed to prevent the installed steel sheet piles for seawalls from oxidizing and corroding over time. Specifically, it is installed in the space between the steel sheet piles for seawalls and the formwork erected along the front side. The present invention relates to a corrosion protection construction method for steel sheet piles for bank protection, in which a corrosion protection wall for the steel sheet piles is constructed by injecting and hardening mento mortar.

This type of conventional construction method, as shown schematically in Figures 1 and 2, consists of a steel sheet pile 01 for seawall and a formwork 0 erected in front of it.
In the space OA between 2 and 2, cement mortar is injected from the hose 06 inserted at a position near the construction starting point A until it reaches a predetermined covering height. However, in this conventional construction method, the range in which the cement mortar flows during one injection is quite long (as shown by t2 in the figure). During the flow of the cement mortar, it spends a long time in contact with water (in other words, the mixture dilution of cement mortar and water tends to deteriorate the quality and strength of the corrosion protection wall, and in addition, the injection hose Coupled with the fact that the movement was carried out in an arbitrary manner, the anti-corrosion wall could not be made homogeneous over its entire length, resulting in localized areas of poor quality.

In view of these circumstances, the present invention has developed a construction method that can suppress the mixing dilution of cement mortar and water and construct a high-quality anti-corrosion wall that is homogeneous over the entire length by simply adding an extremely simple preliminary process. It has a purpose in what it proposes.

In the steel sheet pile corrosion protection construction method for seawalls according to the present invention, bag-like bodies made of porous material are installed at appropriate intervals in the cement mortar injection space, and cement mortar is first poured into the bag-like bodies. A series of anti-corrosion walls including the partition walls are constructed by sequentially repeating the process of creating a partition wall by injecting cement mortar into a unit injection space partitioned by the partition wall. do.

That is, in the construction method of the present invention, by partitioning a long cement mortar injection space into units of length using partition walls, the flow distance of the poured cement mortar is kept short, and the water and water accompanying the flow of the cement mortar are kept short. The amount of mixing and dilution can be significantly reduced compared to the conventional method.

Moreover, since the injection space is a relatively short partitioned space, the injection work using a hose is simple and easy, and there is no need to spread the cement mortar as the hose is pulled up after injection (and there is no need to worry about water leaking from the work surface). Mixing and dilution can be sufficiently suppressed, and a high-quality anticorrosion wall can be constructed in a homogeneous state over its entire length.

Moreover, since the partition wall is made by injecting cement mortar into a bag-like body made of porous material,
Not only is it economically advantageous compared to using concrete blocks or formwork, or has the advantage of good workability with only very simple preliminary work, but it also has the advantage of being easy to work with, as it requires pre-poured cement mortar. The cement mortar injected next to the bag-like body is integrally bonded with the cement mortar inside through the numerous holes in the bag-like body. There is no fear that the partition wall will become a defect in the desired corrosion protection performance in the future.

In summary, the present invention has made it possible to efficiently construct a high-quality anti-corrosion wall that is homogeneous over its entire length by simply adding a very simple preliminary process.

The construction method of the present invention will be described below in detail based on illustrative drawings. As shown in FIGS. 3 and 4, a type of steel sheet pile for seawall 1 and its front surface are erected in a parallel or almost parallel position. Within the cement mortar injection space A between the frame 2 and at appropriate intervals (approximately 4 to 6 meters) in the longitudinal direction, for example, use Sarashi cotton, hemp, etc., within a sufficient range for cement particles to pass through. A bag-like body 4 having as many holes as possible, that is, made of a porous material, is held by bolts 7 for anchoring the formwork 2 to the steel sheet pile 1, as shown in FIG. set in the state.

First, cement mortar is injected into the bag-like body 4 closest to the construction starting point A to a predetermined covering height to create a partition wall 5 as shown in FIG. 6 to form a unit injection space a. .

After that, until the cement mortar in the bag-like body 4 hardens, cement mortar is injected into the unit injection space a through the hose 6 inserted into the center of the unit injection space a, and the hose Raise 6.

When the injection of cement mortar into the unit injection space a is completed, cement mortar is injected into the bag-like body 4 close to the unit injection space a in the same manner as described above to create the partition wall 5, and then the partition wall 5 and the former partition wall 5 are connected. The unit space between aVc-t = ment mortar is injected.

By sequentially repeating the above steps in the direction of the arrow in FIG. 4, a series of anti-corrosion walls 3 including the partition walls 5 are constructed as shown in FIG. 7.

In addition, in carrying out the above construction method, as the formwork 2,
By using glass fiber reinforced cement mortar and constructing a composite wall of this and the anti-corrosion wall 3,
This has the effect of not only increasing the anti-corrosion effect but also significantly increasing the durability of the anti-corrosion wall.

Further, regarding the installation of the bag-like body 4, it is desirable to install it at the same time when the formwork 2 is assembled, but it is also possible to install it one by one before pouring into each unit space.

[Brief explanation of the drawing]

The drawings illustrate an example of the anti-corrosion construction method for steel sheet piles for seawalls according to the present invention, and FIGS. 1 and 2 are a schematic plan view and a schematic front view for explaining the conventional construction method, and FIGS. 3 and 4 The figures are a schematic plan view and a schematic front view for explaining the construction method of the present invention, and FIGS. 5 to 7 are enlarged cross-sectional plan views of main parts shown in the order of steps. 1...Steel sheet pile for seawall, 2...Formwork, 3
... Corrosion protection wall, 4 ... Porous material bag-like body, 5 ... Partition wall, A ... Space for mortar injection, a ... ...Unit injection space.

Claims (1)

[Claims] 1. Steel sheet pile 1 for seawall and formwork 2 erected along its front surface.
A corrosion protection construction method for steel sheet piles for revetment in which a corrosion protection wall 3 for the steel sheet pile 1 is constructed by injecting and hardening cement mortar in the space A between the cement mortar injection space A. Bag-like bodies 4 made of porous material are installed at appropriate intervals, and partition walls 5 are created by first injecting cement mortar into the bag-like bodies 4, and then a unit injection space a partitioned by the partition walls 5 is filled with A corrosion protection construction method for steel sheet piles for bank protection, characterized in that a series of corrosion protection walls 3 including the partition walls 5 are constructed by sequentially repeating the step of injecting cement mortar. 2. The anti-corrosion construction method for steel sheet piles for bank protection according to claim 4, characterized in that the formwork 2 is made of square fiber-reinforced cement.