JPH0647973Y2 - Repair structure for scouring part of rubble mound for mixed dike - Google Patents

Description

[Detailed Description of the Invention] <Industrial application field> This invention is a rubble mound for a mixed dike for backfilling and repairing a portion where a rubble mound under a mixed dike, such as a caisson, a concrete block or a cellular block, is backfilled. Concerning the scrubbing part repair structure.

<Prior art> A caisson-type mixed breakwater type breakwater in which concrete caisson is installed on a rubble mound formed by rubble stones of 5 kg to 200 kg in and outside, and one of the drawbacks of the seawall structure is abnormal waves and abnormal tidal current. There is a rubble mound scouring caused by. This scouring is caused by the rubble and sand being washed out due to the disturbance of the waves and the flow, especially on the upper surface of the rubble mound where the caisson is installed and on the slope, and the sliding of the caisson, poultry house and rubble mound May cause collapse.

For this reason, traditional methods have been used to install root blocks on the front and back of the caisson, to cover the top of the rubble mound with a covering stone, and to protect the butt of the rubble mound with an asphalt mat or synthetic resin mat. However, the above scour still cannot be avoided.

Therefore, today, divers are replenishing rubble stones to the scour area and mixer boats are pumping underwater concrete to the scour area.

<Problems to be solved by the invention> However, of the conventional repair methods for the scour part,
Since the former diver's rubble refilling work is manual work, it is not possible to completely refill the rubble due to the work space restrictions in the scour section directly below the caisson, and the latter underwater concrete filling work. As the caisson sits on the underwater concrete, the resistance to sliding between these becomes smaller, and the underwater concrete is filled in the gap part of the unnecessary rubble, which is uneconomical. there were.

This invention was made in view of such conventional problems, and it is economical and easy to repair the scour part while completely replenishing the scour part and keeping the sliding resistance of the caisson on the rubble mound sufficiently large. It is an object of the present invention to provide a structure for repairing a scouring part of a rubble mound for a mixed dike that can be implemented.

<Means for solving the problem> The scouring part repair structure of the rubble mound for a mixed dike according to the present invention has an expansive bag body installed in the scouring part formed on the rubble mound around the bottom of the mixed dike, The opening of the expandable bag is made higher than the opening of the scour part, and the packed concrete or concrete block is juxtaposed so as to constrain the opening of the expandable bag, and underwater concrete is placed in the expandable bag. It was formed by pouring the underwater concrete into every corner of the scour part with a complicated shape and filling up to the opening of the malleable bag formed higher than the opening of the scour part. It is a thing.

Here, it is preferable to use a material capable of closely adhering to the caisson and giving a large sliding resistance to the caisson, for example, a malleable asphalt bag.

<Action> The bag according to the present invention has extensibility, and is inserted into the scouring part formed on the rubble mound, and the opening of the expansive bag is made higher than the opening of the scouring part and the expansion is performed. When underwater concrete is poured into the inside of the flexible bag, the underwater concrete expands the bag, and through the expandable bag, every corner in the scour part with a complicated shape surrounded by the abandoned stone and the caisson bottom surface. Further, it is filled up to the opening of the malleable bag formed higher than the opening of the scour part. Here, the bagging concrete or concrete block is juxtaposed so as to restrain the opening of the malleable bag, so that the opening of the malleable bag filled with underwater concrete is the opening of the scour section. It is possible to keep it higher than the part and prevent the underwater concrete from flowing out. Also, when the underwater concrete filled in the opening of such a stretchable bag solidifies, it becomes possible to prevent further scouring from this part, and the bag closely adheres to the caisson and becomes It works to make the sliding resistance equal to or higher than the original design.

<Embodiment of the Invention> An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the scrubbing part repair structure according to this invention in detail, and FIG. 2 is a sectional view showing the scrubbing part structure before repair. The details of this invention will be described below with reference to these drawings. Referring to the figure, 1 is a caisson as a mixed dike having an upper concrete 2, and the caisson 1 is installed on a rubble mound 3 made of foundation rubble. Reference numeral 4 is a covering stone provided so as to cover the upper surface of the rubble mound 3, and reference numeral 5 is a root solid block provided outside the harbor at the base of the caisson 1. Further, 6 is a scouring part on the rubble mound formed immediately below and around the caisson 1, and a part of the covering stone 4 and the root block 5 are also depressed by the scouring as shown in the figure.

Further, in FIG. 1, 7 is an expansive asphalt bag installed in the scour part 6, 8 is underwater concrete injected into the expansive asphalt bag 7 through the opening 7a, 9
Is a concrete block provided around the base of the caisson 1 and surrounding the scour part 6. This concrete block 9 is the opening 7a of the malleable asphalt bag 7.
It is provided so as to restrain the vicinity. Reference numeral 10 denotes a flexible tube for injecting underwater concrete which is inserted into the malleable asphalt bag 7 through the opening 7a, and a pipe 11 for delivering underwater concrete is connected to the flexible tube 10.

Next, a procedure for repairing the scouring part of the rubble mound 3 will be described. First, the scour part 6 on the rubble mound 3 is investigated by diving, and the shape and size of the scour part 6 are confirmed. According to the result of this investigation, a malleable asphalt 7 suitable for the above-mentioned shape and size is manufactured, and this is inserted into the scour part 6 by diving work and installed. Then, in order to restrain the expansive asphalt bag 7, the concrete blocks 9 are restrained side by side in the unconstrained portion near the opening 7a, and the opening 7a is located below the lower end surface of the caisson 1.
Even if the height is higher than 1 m, it will not be significantly deformed or displaced. Before and after this work, bagging concrete is placed around the scour section 6 in order to restrain the expansive asphalt bag 7 in the scour section 6.

In the stretchable asphalt bag 7 thus constrained and installed,
This time, highly fluid underwater concrete is poured from the opening 7a through the flexible tube 10. In this way, as the underwater concrete 8 is filled into the malleable asphalt bag 7 from the innermost side, the flexible tube 10
Is gradually pulled out from the malleable asphalt bag 7. When it is completely filled, the opening 7a is closed and the flexible tube 10 is completely pulled out to complete the repair work. It should be noted that the installation of the bagged concrete in the above-mentioned work can be carried out at the beginning of the repair work and at the time of damming around the lower end of the caisson 1.

According to the repair structure of the scour part 6 thus obtained,
The backfilling of the scour part 6 can be carried out completely and easily, and since the caisson is installed on the underwater concrete through the expansive asphalt, the caisson has a large sliding resistance and is equivalent to the original design. More caisson stability can be obtained.

<Effect of device> As described above, according to this device, the expandable bag is installed in the scour part formed on the rubble mound at the lower part of the mixed dike such as caisson, and the opening of the expandable bag is described above. It is made higher than the opening of the scour part, and further, bagging concrete or concrete blocks are juxtaposed to the scour part so as to restrain the opening of the malleable bag, and underwater concrete is poured into this malleable bag. The structure for repairing the scouring part makes it possible to fill the underwater concrete so that it spreads to every corner of the scouring part while expanding the bag body, and also prevents the underwater concrete from being filled into unnecessary rubble gaps. It becomes possible to do. Further, when the underwater concrete in the opening of the malleable bag which is supported higher than the opening of the scour portion solidifies, it becomes possible to prevent further scour from this portion. Furthermore, the underwater work by the diver or the like becomes extremely simple, and the poured underwater concrete can be prevented from flowing out from the opening of the malleable bag.
Therefore, the amount of underwater concrete used can be minimized and injection is easy, so the cost of repair work can be reduced, and the sliding resistance of the caisson can be sufficiently secured to ensure its stability. And the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure for repairing a scouring part of a rubble mound for a mixed dike according to the present invention, and FIG. 2 is a sectional view showing a structure for a scouring part before repairing. 1 ... Mixed levee, 3 ... Rubble mound, 6 ... Scour section, 7 ... Expandable asphalt bag, 8 ... Underwater concrete.

Claims (1)

[Scope of utility model registration request] 1. A malleable bag body having a predetermined shape is installed in a scouring part of a rubble mound formed around the bottom of a mixed dike, and the opening of the malleable bag is made higher than the opening of the scouring section. Further, bagging concrete or a concrete block is juxtaposed so as to restrain the opening of the expansive bag, and the expansive bag formed in the scour part and the expansive property formed higher than the opening of the scour part. A structure for repairing a scouring part of a rubble mound for a mixed dike, in which the opening of the bag body is filled with underwater concrete.