JPH0598619A - Joining structure for marine structure - Google Patents

Abstract

PURPOSE:To improve durability by putting the large diameter through holes of plural concrete blocks onto a pile erected on the sea bottom to laminate the blocks, and filling the through holes with an underwater setting type flexible material after the blocks are clamped by PC steel materials provided in the through holes. CONSTITUTION:Steel piles 1 respectively provided with a hanging device 7 on its top are erected on the sea bottom ground G at specified intervals. A circular block 32 having a packing 8 is put onto the pile 1, and hung on the hanging device 7 through PC steel materials 5. Plural concrete blocks 31, each of which has a large diameter through hole 2, are provided and laminated on the block 32 in sequence. A reaction force member 11 is provided on the uppermost block 31, and the steel materials 5 are tensed using the reaction force member as a reaction receiver to clamp all the blocks. Further, after the hole of the block 32 is filled with cement concrete 9, the hole 2 is filled up with an underwater setting type flexible material 6 made of asphalt emulsion. Thus, cracks of the junctions can be prevented and prestress can also be reduced.

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-proof structure.

[0002]

2. Description of the Related Art Offshore structures made by the precast method are
Since it is desirable to increase the proportion of onshore construction, avoiding offshore construction where quality, safety, process, and economic efficiency are difficult to secure, construction of structures is carried out by constructing 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, JP-A-1-295906).

That is, the concrete blocks are joined together or the blocks and the foundation piles are joined together 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 will be packed.

[0004]

However, in the joint structure of the above-mentioned offshore structure, 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 generated. 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 are likely to occur. Then, when the filling material comes into contact with seawater due to this opening, the filling material is liquefied into wear and liquefied by the repeated external force of the waves and is eluted into the sea. The so-called pumping action causes the PC steel rod to be exposed to the seawater and corrode, resulting in a structure. 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 durable marine structure. To provide a joint structure of the offshore structure.

[0006]

In order to achieve the above object, the present invention has the following construction. That is, a pile is erected on a desired seabed, and a plurality of concrete blocks formed by forming through holes having a diameter larger than the pile diameter are stacked by inserting the through holes into the pile, While inserting a connecting steel rod connecting the concrete block and the top of the pile into the cavity formed by the through-hole, is a configuration such that the underwater curable flexible material is filled in the cavity,
In addition, the underwater-curable flexible material may be a material containing an asphalt emulsion as a main component.

[0007]

[Function] When a concrete block and other members are integrated by prestressing to join an offshore structure, underwater hardening type flexibility is used as a filling material around the PC steel material (connecting steel bar) after the introduction of prestressing. By using a material and utilizing the flexibility and water stopping properties of this material, cracking and deterioration of the filling material can be eliminated to prevent corrosion of the PC steel material, and a small amount of prestress can be introduced. It is possible to join economical and durable offshore structures.

[0008]

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 the 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. In this case, the joint structure between the steel pile 1 and the concrete block 3 has a structure in which the annular concrete block 32 at the bottom end and the top of the steel pile 1 are connected with a PC steel material (connecting steel rod) 5 and inserted into the steel pile 1. The concrete block 3 to be inserted is inserted so as to surround the steel pile 1 and the PC steel rod 5 and sequentially placed on the concrete block 32 at the lowermost end, and the through holes 2 of the plurality of laminated concrete blocks 3 are inserted. A hollow portion 10 formed by the inner wall 2 and the steel pile 1 existing inside and the outer periphery of the PC steel material 5 is filled with an underwater hardening type flexible material 6. 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 marine structure will be described as follows. First, the steel piles 1 are driven into the seabed G at a predetermined interval (interval between the through holes 2 and 2 provided in the concrete block 31 described later), and the steel piles 1 are 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 PC steel material 5 is moved upward with its tip end portion. Keep it protruding. A 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 using the lowermost annular block 32 as a support.
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 PC are inserted into one of the through holes 2 of another concrete block 31. The steel material 5 is inserted and placed on the 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, on the upper part of the suspension device 7, the reaction force member 11 straddling the through hole 2 and the suspension device 7 is arranged on the concrete block 31 in the uppermost stage, and the suspension 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
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 is 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 cracking and deterioration of the filling material of the marine structure construction and prevent 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 a 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 as compared with conventional cement-based and slag-based materials due to the properties of asphalt, and have sufficient waterproofness. 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 mixed with salt. 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, Alternatively, a mixed composition obtained by adding cement, sand, bentonite (a thickener), and a cement rapid hardening agent 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 using BL asphalt dairy material (containing rubber chips) and Concrete or the like is also conceivable.

[0014]

INDUSTRIAL APPLICABILITY As described above, the present invention uses the underwater-curable flexible material as a filling material to prevent cracks generated at the joint position of the block and to provide a highly durable marine structure. Since it can be made into a joint structure, this type of structure, which was forced to introduce a large capacity and reliable prestress to prevent corrosion of the connecting steel material of the concrete block, can be used with a small capacity prestress that is familiar to the block. The effect of increasing the economical efficiency is achieved.

[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

Claims (2)

[Claims] 1. A plurality of concrete blocks, each of which has a pile erected on a desired seabed and is provided with a through hole having a diameter larger than the pile diameter, is laminated by inserting the through hole into the pile. An ocean characterized by inserting a connecting steel rod that connects the concrete block at the bottom end and the top of the pile into the cavity formed by the through hole, and filling the cavity with an underwater-curable flexible material. Joint structure of structures. 2. The joint structure for marine structures according to claim 1, wherein the underwater-curable flexible material is a material containing an asphalt emulsion as a main component.