JPH0489917A - Executing method for rubble mound - Google Patents

Abstract

PURPOSE:To perform operation accurately and effectively even in a place with large surges by installing a caisson capable of sunk installation and coming up by buoyance to the water surface in such a way as sunk at the foremost of a reclamation district, putting in rubbles and surface course finishing rubbles, and performing the grading by the use of dead-weight. CONSTITUTION:A caisson 1 capable of sunk installation and coming up by buoyancy to the water surface is furnished, comprising an upper steel pipe structure 2 and a lower caisson 3 admitting water injection and exhaust. This caisson 1 is sunk at the foremost of a rubble mound reclamation district, and there rubbles 11... are slung in. Thereon surface course finishing rubbles 7, 7 are put by a crawler crane 8 installed on the upper stage 6 of the caisson 1. Grading of the rubble mound is performed by the use of a dead-weight 13 fixed to this crawler crane 8. Then the caisson 1 is allowed to come up to the water surface and moved to the next place specified, and the same procedures are repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing a rubble mount that can be constructed even in offshore locations where waves are large.

(Conventional technology) Conventionally, in order to construct offshore structures such as breakwaters, a rubble mound is created on the seabed at the installation location, but in order to construct the rubble mound, it is necessary to After the rubble was thrown in by a Gatsuto ship, surface finishing rubble was thrown on top of it, and then a weight was attached to the crane ship and the weight was dropped to level the rubble mound.

However, in areas with large waves, the hull of the crane ship shakes due to the waves, making it impossible to drop the weight onto the designated rubble, making the work not only difficult but also inefficient, as well as making it difficult to accurately place the rubble. There was a problem that leveling work was not performed.

[Problem to be solved by the invention]

The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a method for constructing a rubble mound that allows accurate construction of a rubble mound to be carried out easily and efficiently even in places with large waves. is the problem to be solved.

(Means for Solving the Problems) As a means for solving the above problems, the method for constructing a rubble mound of the present invention includes: After sinking a caisson that can be sunk and floated at the tip of a rubble mound construction area, In addition to putting rubble onto the rubble mound creation area, a crawler crane installed on the upper stage of the caisson put in rubble for surface finishing, and the rubble mound was leveled with a weight attached to the crawler crane. After that, this caisson is floated, moved to an appropriate position, and sunk, and the above steps are repeated.The method consists of adding rubble for surface finishing and leveling the rubble mound with a weight, or placing it on the seabed. It is carried out under stable conditions by a crawler crane on a caisson fixed above.

In addition, as a caisson that can be sunk and floated during the above construction, it is possible to use a caisson consisting of a lower caisson that can be filled with water and an upper steel pipe structure, which allows waves to pass through the upper steel pipe structure and prevents the influence of waves. This is preferable because it makes it smaller.

〔Example〕

An embodiment of constructing a rubble mound using the construction method of the present invention will be described below with reference to the drawings. 5 to 5 are a series of side views showing the construction procedure of the rubble mound.

First, as shown in Fig. 1, the caisson 1 used in this construction example consists of a lower caisson 3 into which water can be poured, and 2 steel pipes 2 at equal intervals rising above the lower caisson 3.
It consists of an upper steel pipe structure section 2 consisting of A, and each steel pipe 2
A is strongly reinforced with braces 2B and horizontal braces 2C,
When this caisson 1 is finally used as a main structure such as a breakwater, an insertion groove 5 is provided at each side end of each steel pipe 2A for inserting a partition concrete slab for filling the inside with filling material. fender 4 near the water surface W.
is installed.

In addition, the lower caisson 3 is filled with water using the inside of a plurality of steel pipes 2A of the upper steel pipe structure 2, and the upper end of the steel pipe 2A is provided with a lid that can be opened and closed, and the lower end of the caisson It opens into 3.

Further, an upper stage 6 is provided above the caisson 1 so as to be above the water surface W, and on this upper stage 6, rubble 7 for finishing the surface layer is placed, and a crawler crane 8 is installed.

Next, the procedure for constructing a rubble mound using the above caisson 1 will be explained in the order of FIGS. 2 to 5.

First, as shown in Figure 2, the caisson 1 is sunk on the seabed B at the tip of the rubble mound creation area by injecting water into the lower caisson 3, and then the rubble
1 onto the seabed B in the rubble mound creation area.

In this case, the movement and sinking of caisson 1 is carried out by lower caisson 3.
This is done by draining the inside of the lower caisson 3, floating the caisson 1, moving it to a predetermined position using an anchor, and injecting water into the lower caisson 3.

Next, the surface finishing rubble 7 transported and placed on the upper stage 6 of the caisson 1 is transported and placed on the upper stage 6 of the caisson l by a crawler crane 8 installed on the upper stage 6, as shown in Fig. 2. Insert it into the designated position on the ll.

After that, the weight 13 is attached to the crawler crane 8,
As shown in FIG. 4, the rubble mound is leveled from above the surface finishing rubble 7 that has been thrown in.

As described above, when the leveling of the designated rubble mound creation area is completed, the inside of the lower caisson 3 is drained, the caisson L is floated, and as shown in Fig. 5, the caisson L is moved to an appropriate position and sunk, and then the second The rubble mound is constructed by repeating the steps shown in the figure.

Furthermore, after all leveling work is completed, caisson 1
is installed on a rubble mound, and filler sand is injected into the lower caisson through a plurality of steel pipes 2A by slurry transport, and into the insertion grooves 5 provided in each steel pipe at each side end of the upper steel pipe structure 2 for partitioning. It is also possible to use the caisson I as a main structure such as a breakwater by inserting concrete slabs to close the gaps between the steel pipes and filling them with filler material.

In addition, in the above construction example, the upper steel pipe structure section 2 is placed above.
By using a caisson 1 having a lower caisson 3 that can pour water downward, the structure allows waves to easily pass through the upper part and reduces resistance to waves.Of course, the caisson 1 of the above embodiment The rubble mound construction method of the present invention can be applied to any type of caisson, including, but not limited to, a caisson with an upper and lower structure that can be sunk and floated by water injected into the caisson body.

[Effects of the Invention] As explained above, according to the construction method of the present invention, the work of charging and leveling the surface finishing rubble to be thrown onto the rubble is carried out from the upper stage of the caisson fixed on the seabed. This has the advantage that it can be carried out accurately and efficiently even in areas with large waves.

In addition, if the caisson 1 is used, which has a structure through which waves pass, such as the upper steel pipe structure, the resistance of the caisson to waves will be reduced, and the structure of the caisson can be made smaller, which is economical. And since the steel pipe of the upper steel pipe structure can be used for the water supply for flotation, there is an advantage that the work for the water supply becomes easy.

Furthermore, if the caisson is used as the main structure after the leveling work is completed, equipment for constructing rubble mounds can be used for the main structure, which is economical.

[Brief explanation of drawings]

Fig. 1 is a side view for explaining the situation during leveling of rubble according to one embodiment of constructing a rubble mound by the rubble mound construction method of the present invention, and Figs. 2 to 5 show the construction procedure according to Fig. 1. FIG. 3 is a series of side views. 1... Caisson, 2... Upper steel pipe structure, 3...
Lower caisson, 6... Upper stage, 7... Rubble for surface finishing, 8... Crawler crane, 11... Rubble, 13... Weight. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] 1. After a caisson that can be sunk and floated is placed at the tip of a rubble mound creation area, rubble is thrown onto the rubble mound creation area, and then installed on the upper stage of the caisson. After loading rubble for surface finishing using a crawler crane and leveling the rubble mound with a weight attached to the crawler crane, the caisson is floated, moved to an appropriate position, set down, and the above steps are repeated. Construction method of rubble mound. 2. The method for constructing a rubble mound according to claim 1, wherein a caisson that can be sunk and floated includes a lower caisson capable of pouring water and an upper steel pipe structure.