JP3065952B2 - Keren method for circular columnar structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a columnar structure having a substantially circular cross section constructed underwater or in the ground, for example, dirt such as earth and sand adhered to a columnar portion such as a pier, moss, shells, etc. The present invention relates to a method for removing water, animals and plants attached to a circular columnar structure.

[0002]

2. Description of the Related Art As a reinforcement method for improving the seismic resistance of a bridge in which a problem has become apparent in recent years, a space is formed in the underground or below the water surface for reinforcement work of an underwater part, and a structure around an existing structure is formed. There is a method of constructing a body, integrating the structure with the structure, and reinforcing the structure. Applicant filed Japanese Patent Application No. 8-223954.
In particular, the authors proposed an effective method for reinforcing underwater structures. In this method, as shown in FIGS. 5 and 6, a plurality of precast panels divided in the circumferential direction are combined on a water surface with a pier column portion 1 in an underwater portion, and a tubular structure 32 is laid down. The gap between the inside and the surface of the columnar body is to be filled with expansion-curable mortar 34 or the like. FIG. 5 is an overall view, and FIG. 6 is a view taken along the line BB of FIG. Also, for a structure constructed on land, a similar method has been proposed in a case where an addition work such as a reinforcement structure is performed on an underground portion of the structure.

In order to tightly integrate the existing structure and the reinforcing structure, it is desirable to completely remove and remove dirt from the outer peripheral surface of the structure, which inhibits the adhesion of mortar or concrete. When excavating the underground area around the existing structure, deposits such as earth and sand remain around the exposed surface of the structure, requiring surface cleaning with a brush, chisel, high-pressure cleaning water, etc. In some cases, there is a problem that seaweed and especially shells such as oysters adhere to the structures constructed in the sea, and the removal thereof requires diving work and the like, resulting in a large cost.

[0004]

In order to tightly integrate the structure to be added around the existing circular columnar structure, it is necessary to remove the debris on the surface of the existing columnar structure. An object of the present invention is to develop and provide a method that does not require dangerous work such as diving work even in an underwater part.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a chain-shaped body is suspended in a U-shape so as to come into contact with the outer periphery of a columnar structure having a circular cross section, and the chain-shaped body is maintained in a U-shape while maintaining the U-shape. And moving the chain-like body over the surface of the columnar structure to remove extraneous matter. The outer circumference where the chain-like body hangs down in a U-shape and contacts the circular columnar structure has a central angle of 18 mm at the central angle of the columnar structure.
The angle may be 0 degrees or more. Further, the chain-like body may be a plurality of chains having different locking positions, hanging directions, lengths, and the like. Further, it is preferable that an additional weight is hung on the hanging lower end of the chain.
The additional weight may be an iron lump or the like.

The chain-like body referred to here may be a ready-made link chain, a roller chain, or a bead formed by fixing an iron lump or the like to a wire rope. In this case, the iron lump is a polyhedral sphere. It is effective that the spherical bodies are appropriately spaced from each other. Further, the range in which the chain-like body hangs down in a U-shape and comes into contact with the columnar structure is preferably 180 degrees or more at the central angle of the columnar structure. If it is less than 180 degrees, the Keren effect is poor. Note that a range of more than 180 degrees and about 360 degrees is a preferable range. However, in some cases, the chain body may be wrapped over 360 degrees and hung down.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows a columnar structure 1 (bridge pier) having a circular columnar skeleton of 2.5 m in diameter made of concrete built in water.
This is an example in which the present invention is implemented as a pretreatment for covering and reinforcing 4 m upward from the base 2 of the present invention.

In the present invention, the chain is hung in a U-shape so as to come into contact with the outer periphery of the columnar structure, and the chain is moved along the periphery of the columnar structure while maintaining the U-shape to form the chain. Sliding on the surface of the columnar structure removes deposits. FIG. 1 shows an example of a structure for implementing this. In order to remove the deposit 4 below the water surface 3 of the columnar structure 1, an annular fixed worktable 11 is attached to the columnar structure on the water surface. The work table 11
It is made slightly larger than the diameter of the columnar structure 1, and four jacks 12 are fixed to the surface of the columnar structure 1. At the same time, it is hung by a hanging material 13 on a hanger 14 provided on the columnar structure upper part 5 and supported. As the columnar structure upper part 5, a pier pillow or the like may be used. The suspending member 13 is made to be able to expand and contract so that the height position of the fixed worktable 11 can be changed. A rotating device 15 that suspends the chain 16 is suspended from the fixed worktable 11. Chain-like body 16 used here
A link chain having a nominal line diameter of 14 mm, which easily fits on the surface of the columnar structure 1, was used.

FIG. 2 is a view taken along the line AA in FIG.
Both ends of 6 are locked to the rotating device 15 at engagement points 19 and 19, respectively, which have been turned more than half the circumference of the columnar structure 1. FIG.
This shows an example of the rotating device 15, in which a roller 23 is interposed between a fixed table 25 and a receiving surface 22 of the rotating table 21,
1 rotates around the columnar structure 1. Workbench 11
An electric generator (not shown) was set in the rotary table, and the turntable 21 was driven by an electric motor 24 equipped with a speed reducer. The higher the rotation speed of the turntable 21, the more efficient the Keren operation becomes. However, if the rotational speed is too high, the force of the chain 16 pressed against the columnar structure by the centrifugal force is weakened, and the Keren effect is reduced. Since the Keren effect varies depending on the type of the attached matter, the rotation speed of the turntable 21 is adjusted while monitoring the Keren state. Fixed stand 2
5 is fixed to the columnar structure 1 by a jack 12.

FIG. 4 is a schematic view of the principle of the Keren method according to the present invention. The chain 16 which is suspended at the engagement points 19 of the rotating device 15 and naturally hangs in a U-shape is rotated by the rotation of the rotating device 15. Rotate in the direction 18 and set the engagement position to 19
The figure shows a state in which the adhering matter is removed while sliding along the surface of the columnar structure 1 while changing to a, 19a, 19b, 19b. If it is not possible to remove the lifting area 20 by one lift, the length of the hanging member 13 (see FIG. 1) is adjusted, and the position of the fixed worktable 11 is moved in the vertical direction (arrow 17). Alternatively, a plurality of chains 16 having appropriately changed lengths may be used.

In the method of the present invention, the surface of the columnar structure is quenched by the weight of the chain 16, and in some cases, a weight W is added to the chain 16 so that the chain 16 is brought into close contact with the surface of the columnar structure with a strong pressure, thereby reducing the Keren effect. Improve. The present invention slides a U-shaped chain-shaped body in contact with the surface of the columnar structure to slide the surface of the columnar structure, and performs kelening, and is limited to the apparatus and the moving method of the above embodiment. is not. For example, in the above embodiment, the chain 16 is fixed at two points at both ends. However, if the chain 16 is formed into an endless loop so that the chain itself is driven and run, the Keren effect can be further enhanced.

Although this embodiment is an example in which the present invention is applied to a concrete columnar structure, it is needless to say that the present invention can also be applied to a steel columnar structure.

[0013]

According to the method of the present invention, when removing dirt, earth and sand, moss, shells and the like attached to the surface of a columnar structure constructed in water, danger work such as diving work is not required. The columnar structure can be effectively quenched, and the adhesion effect between the reinforcing structure and the columnar structure attached to the columnar structure can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a rotating device according to an embodiment of the present invention.

FIG. 4 is a schematic view of the principle of the embodiment.

FIG. 5 is an explanatory diagram of a method of reinforcing an underwater structure.

FIG. 6 is an explanatory diagram of a method of reinforcing an underwater structure.

[Description of Signs] 1 pillar-shaped structure (pier) 2 foundation 3 water surface 4 attached matter 5 pillar-shaped structure upper part 11 fixed work table 12 jack 13 hanging material 14 hanging tool 15 rotating device 16 chain 17 vertical Arrow) 18 Rotation direction 19 Engagement point 20 Keren range 21 Turntable 22 Receiving surface 23 Roller 24 Motor 25 Fixed base 32 Reinforcement member 34 Filler W Additional weight (weight)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-112807 (JP, A) JP-A-52-1971 (JP, A) JP-A 2-33835 (JP, U) JP-A 60-112807 1491 (JP, U) Japanese Utility Model Showa 56-138932 (JP, U) Japanese Utility Model Showa 48-44736 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) B08B 1/00-13 / 00

Claims (4)

(57) [Claims] 1. A chain-shaped body is hung down in a U-shape so as to contact the outer periphery of a columnar structure having a circular cross section, and the chain-shaped body is moved around the columnar structure while maintaining the U-shape. A Keren method for a circular columnar structure, wherein a chain is slid on the surface of the columnar structure to remove extraneous matter. 2. The method according to claim 1, wherein the outer periphery of the columnar structure has a central angle of 180 degrees or more at the center angle of the columnar structure. 3. The method according to claim 1, wherein a plurality of chains are used, each having a different upper end locking position, a hanging position, and a hanging length. 4. The method according to claim 1, wherein an additional weight is suspended from a hanging lower end of the chain.