JP2565811B2 - Joint structure of offshore structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a marine structure which enables economical construction of a concrete marine structure such as a wave preventing structure.

[0002]

2. Description of the Related Art Offshore structures made by the precast method are
Since it is desirable to increase the ratio of onshore works by avoiding offshore works that are difficult to secure quality, safety, process, and economical efficiency, construction of structures is done by manufacturing concrete blocks on land and constructing at sea. The construction method is adopted (Japanese Patent Laid-Open No. 49-55136 and Japanese Patent Laid-Open No. 56-392).
No. 20, Japanese Patent Publication No. 61-6203, Japanese Patent Laid-Open No. 63
-47409, Japanese Patent Laid-Open No. 1-295906). That is, the concrete blocks are joined together or the blocks and the foundation piles are joined by connecting bolts or by introducing prestress, and the mortar or concrete is filled in the voids of the bolt through holes of the concrete block. It is a thing.

[0003]

However, in the joint structure of the above-mentioned offshore structures, since the cross-sectional area of the joint portion of each block is small, the resistance force against the tensile force generated by the action of wave pressure or temperature change is exerted. It is weak, and therefore, when mortar or concrete is used as the filling material, cracks occur in the joint portion, and the openings between the blocks easily occur. When the filling material comes into contact with seawater due to this opening, the filling material liquefies into wear and is eluted into the sea by repeated external forces of waves, so that the PC steel rod is exposed to the seawater and corroded. There was a problem that the deterioration of the material progressed remarkably. The present invention is a joint structure for solving the above problems, and an object of the present invention is to solve the above problems and to construct an economical and highly durable marine structure. It is to provide a joint structure of structures.

[0004]

Therefore, the present invention has the following structure in order to achieve the above object. That is, a pile is erected on a desired seabed, and a plurality of concrete blocks having through holes having a diameter larger than the pile diameter are laminated by inserting the through holes into the pile and connecting steel rods. Through the
Is inserted into the cavity to form a hole with connecting the top of the pile and concrete blocks lowermost, A to said cavity
Curable material such as cement and super absorbent
This is a configuration in which an underwater-curable flexible material mixed with a material is filled.

[0005]

[Operation] When a concrete block and other members are integrated by prestressing to join an offshore structure, asphalt emulsion is used as a filling material around the PC steel material (connecting steel rod) after the prestressing , such as cement. Curable material
A water-curable flexible material that is a mixture of a water- absorbing material and a water-absorbent material is used, and by utilizing the flexibility and water-stopping properties of this material, the occurrence of cracks and deterioration of the filling material is eliminated and PC
It is possible to prevent corrosion of steel materials and to join economical and highly durable offshore structures that require only a small amount of prestressing. In addition, this pile is made up of all laminated concrete
Each concrete block so that it
It is installed in the sea in support of
Support each concrete block more firmly.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a joint structure for marine structures of the present invention will be described below with reference to the drawings. FIG. 1 shows a situation at the time of assembling an offshore structure such as a breakwater, and FIG. 2 shows a joint structure assembled by introducing a PC method. Fig. 1 shows a breakwater offshore structure in which a plurality of steel piles 1 are erected on the seabed G at predetermined intervals.
A horizontally long precast concrete block 3 having through-holes 2 at both ends is appropriately inserted through the through-holes 2 and 2 into adjacent steel piles 1 and 1, and then the different steel piles 1 and 1 are provided with concrete blocks. It is a cross-shaped structure constructed by forming wave passage portions P by sequentially stacking concrete blocks 3 while inserting 3 therein. Steel piles 1 and 1 are sea level
It is erected so that it projects outside. In this case, the joint structure between the steel pile 1 and the concrete block 3 is constructed by connecting the lowermost annular concrete block 32 and the top of the steel pile 1 to a PC.
The concrete block 3 which is connected with the steel material (connected steel rod) 5 and is inserted into the steel pile 1 is inserted so as to surround the steel pile 1 and the PC steel rod 5, and the concrete block 3 at the bottom end is inserted.
2 to be sequentially placed on the inner wall of the through holes 2, 2 ... of the concrete block 3 and the hollow portion 10 formed by the steel pile 1 and the outer periphery of the PC steel material 5 existing therein. It is configured by filling the underwater-curable flexible material 6 inside. In addition,
As the concrete block 3, a horizontally long block 31 having through holes 2 at both ends and an annular block 32 are used.
Further, the inner diameter of the through hole 2 is made larger than the outer diameter of the steel pile 1 in order to form the hollow portion 10.

The method of forming the joint portion of the offshore structure will be described as follows. First, the steel piles 1 are arranged on the seabed G at predetermined intervals (the intervals between the through holes 2 and 2 provided in the concrete block 3 described later).
After that, the steel pile 1 is erected on the seabed G. A suspension device 7 is arranged on the top of the steel pile 1. Next, while suspending and fixing the PC steel material 5 having the lowermost annular block 32 having the through hole 2 formed at the center attached to the lower end thereof from the suspension device 7, the tip end portion of the PC steel material 5 is moved upward. Keep it protruding. The packing 8 is provided between the through hole 2 of the annular block 32 suspended by the PC steel material 5 and the steel pile 1. The packing 8 seals the leakage of the filling material described later. Next, the steel pile 1 is inserted into one of the through holes 2 of the concrete block 31 by using the lowermost annular block 32 as a support base.
And the PC steel material 5 are inserted and inserted (the adjacent steel piles 1 are inserted into the other through holes 2), and then the steel piles 1 and the PC are inserted into one through hole 2 of another concrete block 31. The steel material 5 is inserted and placed on the preceding concrete block 31 (in this case, the adjacent steel pile 1 different from the adjacent steel pile 1 is inserted into the other through hole 2). Thus, the annular block 3
A plurality of concrete blocks 31 are placed on top of 2, and a cross-shaped structure that forms a wave passage portion P together with the adjacent steel piles 1 is formed. Next, in the upper part of the suspending device 7, the reaction force member 11 straddling the through hole 2 and the suspending device 7 is arranged on the concrete block 31 at the uppermost stage, and the suspending device 7 for suspending the PC steel material 5 The projecting end of is projected from the reaction member 11. Thus, the PC steel material 5 is tensioned by using the reaction force member 11 as a reaction force. Thereby, the annular block 32
A tightening force is applied to the reaction force member 11 and the concrete block 3 as a whole. Next, cement concrete 9 is poured as filling concrete for the purpose of rigidly connecting the lowermost concrete block 3 and the steel pile 1. Next, the underwater-curable flexible material 6 is filled in the hollow portion 10 between the steel pile 1 and the PC steel material 5 and the through hole 2 of the concrete block 3 and then placed.

The structure thus completed is repeatedly deformed immediately after assembly due to the influence of wave pressure. The joint portion of the concrete block 3 has a small resistance cross-sectional area against the tensile stress due to this deformation, and tensile stress is easily generated in the filling portion of this portion, but the underwater-curable flexible material 6 has flexibility and
Since the water resistance is excellent, it is possible to prevent the occurrence of cracks and deterioration of the filling material of the marine structure construction and prevent the corrosion of the PC steel material 5.

The underwater-curable flexible material 6 is a material containing an asphalt emulsion as a main component, and is a composition obtained by mixing a hardening material such as cement with the asphalt emulsion and then mixing a superabsorbent material. Something is considered, and it is disclosed in JP-A-2-166.
No. 164 publication and the like. This composition has the property of being hard to be diluted with water, and even if it is cured in the air or in water, it gradually hardens uniformly due to the internal hardening property of the hardening material such as cement. The physical properties of the mixed composition cured in this manner are low in rigidity and excellent in flexibility and have sufficient waterproofness as compared with conventional cement-based and slag-based materials due to the properties of asphalt, and also such as concrete and iron. It has excellent adhesiveness to metal materials and hardly deteriorates. Therefore, when various structures are coated, corrosion of the structures can be prevented. Each constituent material of the composition must be a material that does not decompose even when salt is mixed. Further, as the underwater-curable flexible material 6, a mixed composition obtained by adding cement, sand and a water-absorbing polymer to an asphalt emulsion, a mixed composition obtained by adding cement, sand and bentonite (a thickener) to an asphalt emulsion, A mixed composition in which cement, sand, bentonite (thickener), and cement quick-hardening agent are added to an asphalt emulsion may be adopted. In addition, cement asphalt mortar and concrete using A asphalt dairy material, cement asphalt mortar and concrete using CA asphalt dairy material, cement asphalt mortar and concrete using BL asphalt dairy material (containing rubber chips), etc. Conceivable.

[0010]

As described above, the present invention provides asphalt milk.
An underwater curable flexible material that mixes a hardenable material such as cement with a super absorbent material is used as the filling material to prevent cracks at the joint position of the block and to improve durability. Since this structure can be used as a joint structure of highly reliable offshore structures, this type of structure requires a large capacity and reliable prestressing to prevent the corrosion of the connecting steel materials of concrete blocks. With a small capacity of prestressing, the economy is increased. Also,
The piles erected on the seabed are made up of all the laminated concrete blocks.
Support each concrete block so that
In order to keep it, it is installed in the sea together with the above-mentioned filling material.
It supports each concrete block more firmly,
It is possible to deal strongly with repeated external force.

[Brief description of drawings]

FIG. 1 is a front view showing a situation during assembly of a marine structure of the present invention.

FIG. 2 is a front sectional view showing a joint portion of an offshore structure assembled by introducing the PC method of the present invention.

[Explanation of symbols]

 1 Steel Pile 2 Through Hole 3 Concrete Block 4 Offshore Structure 5 PC Steel Material (Steel Bar) 6 Underwater Hardening Flexible Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sumio Okawa 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura Gumi Co., Ltd. (56) Reference JP-A-3-37148 (JP, A) -89015 (JP, U) Japanese Patent Publication 6-4964 (JP, B2) Japanese Patent Publication 6-974 (JP, B2)

Claims (1)

(57) [Claims] 1. A plurality of concrete blocks in which a pile is erected on a desired seabed and a through hole having a diameter larger than the pile diameter is bored, the through hole is inserted into the pile, and the concrete blocks are laminated. Connected steel rod
While connecting the concrete block at the bottom end and the top of the pile by inserting it into the cavity formed by the through hole, and with a curable material such as cement in the asphalt emulsion in the cavity.
A joint structure for marine structures, characterized by being filled with an underwater-curable flexible material mixed with a superabsorbent material .