JPS5953416B2 - How to install anti-corrosion formwork for steel sheet pile structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a fill-in formwork used to prevent corrosion on the water side surface of a steel sheet pile structure such as a steel sheet pile wall or a steel pipe sheet pile wall.

Conventionally, the method for installing anti-corrosion formwork for steel sheet pile structures is as follows:
As shown in FIG. 1, the support metal fitting 14 consists of a horizontal support plate 11, a mounting plate 12 projecting downward from the inner end of the support plate 11, and a locking plate 13 projecting upward from the outer end of the support plate 11. The mounting plate 12 is inserted into a stud bolt 15 fixed to the steel sheet pile structure 1 by welding under water, and the mounting plate 12 is attached to the steel sheet pile structure 1 by a nut 16 screwed onto the stud bolt 15. The lower end of the burial formwork 18 having the bottom plate 17 is placed on the support plate 11, and the hook-shaped support member 19 attached to the upper end of the formwork 18 is attached to the steel sheet pile structure. A method is proposed in which a bagging mortar 20 or the like is placed on the bottom plate 17 to engage the upper edge of the object 1 and between the formwork 18 and the steel sheet pile structure 1. has been done.

However, in this method, the stud bolts 15 and the support fittings 14 must be installed underwater, which is difficult to work with, and since the formwork 18 is installed after being set, it takes a long time to fix the formwork. There was a problem.

It is an object of the present invention to provide a method for attaching a formwork for anticorrosion of a steel sheet pile structure, which advantageously solves the above-mentioned problems.

Next, the present invention will be explained in detail using illustrated examples.

FIGS. 2 and 3 show a formwork unit 26 used in the present invention, in which a precast concrete formwork 5 is arranged parallel to a steel sheet pile structure 1, and a vertical plate 21 and its Bottom plate 9 integrally provided at the lower end
The back surface of the bottom plate 9 has a shape matching the water side surface of the steel sheet pile structure, and a bottom sealing material 10 made of urethane foam or the like is fixed to the back surface with an adhesive. An L-shaped steel formwork support member 6 is fixed to the upper end, and includes a horizontal part that projects toward the steel sheet pile structure and a vertical part that projects downward from its tip. The part includes a through hole 7 and a plate body 21.
A large-diameter recess 22 connected to the through hole 7 is provided on the surface side of the recess 22 .

Further, slopes 23 are provided at the ends of the plate 21 in the left and right direction, and the slopes 23 are inclined from the front surface to the back surface of the plate 21, and the slopes 23 on both the left and right sides are parallel to each other. Side sealing material 24 made of a sealing material having C elasticity such as a foam or a sealing material having water-absorbing expansion property.
or 1st place.

When implementing this invention and attaching anti-corrosion formwork to an existing steel sheet pile structure, first, as shown in FIG. The lower formwork fixing member 3 and the upper formwork fixing member 4 made of L-shaped steel etc. are fixed by welding or the like at a position slightly higher than 2 and a position slightly lower than the lower surface of the concrete coping 25, and then The formwork unit 26 is hoisted and transported by a crane via a rope 27, and the upper support member 6 of the formwork 5 is engaged with the upper part of the upper locking member 4, as shown in FIG. By suspending the frame unit 26, the formwork unit 2
6 is rotated by its own weight to bring the bottom sealing material 10 into contact with the water side surface of the steel sheet pile structure 911.

Next, as shown in FIGS. 6 to 8, the tip of the locking bolt 8, which is a hook bolt or an L-shaped bolt inserted into the through hole 7 in the middle of the formwork 5, is attached to the lower locking member 3. and the nut 28 and washer 29 of the locking bolt 8 are arranged in the four parts 22, and the formwork 5 is tightened by the nut 28 via the washer 29, so that the bottom sealing material 10
And the support member 6 is brought into pressure contact with the water side surface of the steel sheet pile structure 1.

Locking bolt 8 consisting of hookpol I/L type bolt
is temporarily fixed to the formwork 5 using nuts 28 in advance as shown in FIG. By tightening the locking bolts, the formwork 5 is fixed as shown in FIG.

Further, as shown in FIG. 11, the through hole 7 of the formwork 5 is made into a long hole through which the locking part of the locking bolt 8 can be inserted, and after suspending the formwork, the locking bolt 8 is inserted into the hole 7. The locking bolt 8 is inserted into the through hole 7, and then the locking portion of the locking bolt 8 is inserted into the lower formwork fixing member 3.
10, the formwork may be fixed by tightening the locking bolts as shown in FIG.

In this way, the formwork units 26 are installed one after another.As shown in FIG. 8, the formwork unit 26A is installed first, and then the adjacent formwork unit 26B
When tightened with bolts, the formwork unit T-26B
is moved toward the steel sheet pile structure 1, the side sealing materials 24 are compressed by the slopes 22 of the adjacent formworks 5, so that the joints of the adjacent formworks are completely sealed.

After the installation work of the formwork unit 26 is completed, as shown in FIG. 12, the formwork unit 26 and the steel sheet pile structure 1 are
An anti-corrosion filling material 30 such as concrete or mortar is filled between the recesses 22 and an anti-corrosion filling material 31 such as concrete or mortar is filled between the filling material 31 and the locking bolt 8. Coat the proximal end to prevent corrosion.

As shown in FIG. 8, by arranging the joints between the formworks in the recesses on the water side surface of the steel sheet pile structure 1,
It is possible to prevent a decrease in the thickness of the filling anti-corrosion material at the joints between the formworks and perform high-quality anti-corrosion construction.

Further, by using a material having elasticity as each of the sealing materials 10 and 24, it is possible to absorb driving errors in the steel sheet pile structure.

When carrying out this invention, lower locking member 3. The upper locking member 4 and the support member 6 are made of channel steel.

H-section steel or cut T-section steel may be used.

Bottom sealing material 1 attached to the back of the bottom plate 9 in the formwork 5
0 and the side sealing material 24, urethane foam, comb plate, comb packer, bagged mortar, or a combination of these and a water-absorbing and expanding material can be used.

According to this invention, the lower locking member 3 and the upper locking member 4 are fixed to the water side surface of the steel sheet pile structure 1 above the water surface 2, and the support member is fixed to the upper part of the formwork 5. 6
is placed on the upper locking member 4 to support the formwork 5, and then the locking bolt 8 inserted through the through hole 7 in the middle of the formwork 5 is engaged with the lower locking member 3, and the Since the formwork 5 is fixed by tightening with the locking bolts 8, the formwork 5 can be easily and quickly fixed to the steel sheet pile structure 1 without underwater work by divers. is completed, and then bolt 8
When the formwork 5 is tightened, the bottom sealing material 10 attached to the bottom plate 9 of the formwork 5 is pressed against the water side surface of the steel sheet pile structure 1. Effects such as being able to reliably seal the gap with the sheet pile structure 1 can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing a state in which a formwork for corrosion protection of a steel sheet pile structure is installed by a conventional method. 2 to 9 show an embodiment of the present invention, in which FIG. 2 is a plan view of a formwork unit used in this invention, FIG. 3 is a longitudinal sectional side view thereof, and FIG. A perspective view showing a state in which a lower locking member and an upper locking member are attached to an existing steel sheet pile structure, FIGS. 5 and 6 are vertical side views showing the order in which formwork units are installed, and FIG. Enlarged vertical sectional side view showing the formwork fixing part by the locking bolt, No. 8
The figure is a cross-sectional plan view showing the vicinity of the joints between formwork units,
Figures 9 and 10 are longitudinal side views showing an example of the order in which the locking bolts and the formwork are installed, and Figure 11 is a front view showing a state in which the formwork is provided with a through hole for inserting the locking bolt, which is an elongated hole. figure,
FIG. 12 is a longitudinal sectional side view showing a state in which a filling anticorrosive material is filled between a steel sheet pile structure and a formwork unit. In the figure, 1 is a steel sheet pile structure, 2 is a water surface, 3 is a lower locking member, 4 is an upper locking member, 5 is a formwork, 6 is a support member, 7 is a through hole, 8 is a locking bolt, 9 is a bottom plate, 10 is a bottom sealing material, 22 is a four part, 23 is a slope, 24 is a side sealing material, 26 is a formwork unit, 28 is a nut, 30 is an anticorrosion material, and 31 is a plugging material.

Claims (1)

[Claims] 1 The lower locking member 3 and the upper locking member 4 are fixed to the water side surface of the steel sheet pile structure 1 above the water surface 2, and the support member 6 fixed to the upper part of the formwork 5 is fixed to the upper locking member. The formwork 5 is supported by being placed on the member 4, and then the locking bolt 8 inserted through the through hole 7 in the middle part of the formwork 5 is engaged with the lower locking member 3, and the locking bolt 8 is A formwork for anticorrosion of a steel sheet pile structure, characterized in that the formwork 5 is tightened by the following methods, and the bottom sealing material 10 attached to the bottom plate 9 of the formwork 5 is pressed against the water side surface of the steel sheet pile structure 1. How to install.