JPH06977B2 - Pile-standing wave-proof structure - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a pile standing type breakwater structure constructed by combining a large number of wave breaking members in multiple layers.

[Prior art]

Conventionally, a breakwater structure such as a breakwater or a breakwater,
The pile standing type had a structure that strongly resisted wave force regardless of whether it was permeable or impermeable so as not to be destroyed.

[Problems to be Solved by the Invention]

Therefore, when an unexpectedly large wave force exceeding the design is applied, the structure causes a fatal destruction, and there is a problem that enormous cost and labor are required to repair the same one. An object of the present invention is to solve such a problem.

[Means for Solving the Problems]

The structure of the pile standing wave-preventing structure of the present invention is as follows. A bar-shaped connecting block (12), which is a wave-dissipating member, is laid between the piles (10) erected on the submarine ground in a multi-tiered manner and arranged in multiple stages. Connecting block 12 located at least at the same end as the front of the pair
However, there is a horizontally long slit 12a at a corresponding portion between the piles 10. A plate block 15, which is a wave canceling member, is inserted into the slit 12a and stretched between the upper and lower connecting blocks 12.

[Action]

Therefore, the porosity of the entire structure is small when the wave force due to normal waves acts, but when an unexpectedly large wave force acts, the porosity becomes large because only the plate block first breaks or comes off. Therefore, the wave force acting on the entire structure can be reduced. The repair need only replace the broken or dislodged plate block.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The construction of the pile standing type breakwater structure according to the present embodiment is performed by the following procedure, for example. First, as shown in FIG. 1, a large number of piles 10 are erected in the front-rear, left-right grid pattern on the bottom of the water, and the lengths of the protrusions from the bottom of the water are made substantially the same. After fitting and fixing an annular receiving block 11 which is a precast concrete block to the lower end of the water bottom projecting portion of the case pile 10, a square rod-shaped connecting block 12 which is also a precast concrete block, and a cylinder, if necessary, on it. The piles 10 are sequentially stacked and laid in multiple rows between the piles 10 via the spacer blocks 13 having a shape. That is, the connecting block 12 is provided with a plurality of through holes (not shown) at a predetermined interval, and the plurality of piles 10 arranged side by side in the through holes or the plurality of piles 10 arranged in front and rear. And the lowermost connecting block 12 is directly mounted on the receiving blocks 11 of the front and rear or left and right piles 10, or the spacer block 13 is fitted to each pile 10 and indirectly mounted via the spacer block 13. After the placement, the next-stage coupling block 12 is similarly loaded with or without the spacer block 13 interposed therebetween, and thereafter, the uppermost coupling block 12 is similarly loaded. In this case, at least the connecting blocks 12 located at the front and the end of the pair of waves are provided with laterally long slits 12a in the portions corresponding to the piles 10. As shown in FIG. 4, the slit 12a has a bottom only in the connecting block 12 in the lowermost stage, and the connecting block 12 in the upper stage is a bottomless penetrating vertically. Next, after tightening all blocks between the receiving block 11 and the uppermost connecting block 12 at the top end of each pile 10, the top end of each pile 10 is covered with a cap block 14. After constructing the wave-proof structure body in which the connecting block 12 is the main wave-dissipating member in this way, as shown in FIG. In the slit 12a of the connecting block 12 of a plurality of stages, a vertically long plate block 15 which is also a precast concrete block as an attached wave-dissipating member, the bottom end of the bottommost slit 12a to the bottom bottom slit 12a. Insert until the section reaches. As shown in FIGS. 4 and 5, the plate block 15 narrows the width of the portion located in the slit 12a to form a joint portion 15b having concave portions 15a on both left and right sides, and the other portions are adjacent to each other. Rectangular wave-dissipating part 15c with a width that closes the gap between the piles 10
The hoop streak 16 is embedded in the peripheral edge of the wave-dissipating plate 14c and, for example, two vertical streaks 17 are embedded in the central part of the wave-dissipating plate 14c.
Also, for example, two vertical stripes 18 are buried. The hoop muscles 16 and the vertical muscles 17 and 18 overlap each other. When arranging in this way, the bending strength of the entire plate block 15 is equivalent to the case where the hoop muscle 16 and the longitudinal muscles 17 and 18 are made into one continuous one, but once yielding, the function is lost as a muscle, The structure is such that the junction 15b and the wave breaker 15c are rapidly broken. Finally, the gap between the recess 15a of the plate block 15 and the slit 12a of the connecting block 12 is filled with a caulking material (for example, underwater curing type rubber) 19 to complete the wave preventing structure as shown in FIG. . In this case, the wave breaking section 15 at the top of the plate block 15
Although c is cantilevered by the uppermost connecting block 12, the other wave-dissipating portions 15c are fixed to the upper and lower connecting blocks 12 at both ends. Therefore, the bending moment of the plate block 15 against the wave force is as shown in FIG. According to such a wave preventing structure, normally, the plate block 15 constitutes a large area wave-dissipating surface, and the porosity of the entire structure is almost the same as that of the wave preventing structure simply by stacking the conventional connecting blocks. However, since the plate block 15 breaks against an unexpectedly large wave force, the porosity increases at once and the wave force acting on the structure is greatly reduced (for example, the porosity is 0.2 From 0.4 to 0.4, the wave force acting decreases by 20 to 30%), so the breakage remains only in the plate block 15. For repair, after removing the caulking material 19 and removing the remaining plate of the plate block 15, a new plate block 15 can be set in the same manner as above, and the caulking material 19 can be easily removed, making it easy and economical. Can be repaired. The structural design such as the proof strength against wave force of each wave breaking member is different depending on the form of the structural system between the case of fixed support at both ends, the case of cantilever support, and the case of both ends detachable support. Like The definitions of the symbols are as follows. Mr ... sectional Strength (maximum bending moment can be cross section of the member is responsible) a t _... Tensile effective height b ... wave absorbing member rebar cross section sigma _{y ...} Tensile strength at yield point d ...... wave absorbing member rebar wave height H _D width l ... length Md ... acting bending moment f ...... member occurring members distributed load W o _... unit weight H ...... height H E _... normal wave of sea water wave absorbing member of ... for height fixed-fixed support of the biggest wave _{Mr = 0.9 · a t · σ} y · d f = 0.1 · W o · H Determination of structural specifications And For cantilevered _{Mr = 0.9 · a t · σ} y · d f = 0.1 · W o · H Determination of structural specifications And If both ends detachably supporting _{Mr = 0.9 · a t · σ} y · d f = 0.1 · W o · H Determination of structural specifications And

【The invention's effect】

According to the pile standing wave-preventing structure of the present invention, the porosity of the entire structure is small when the wave force due to a normal wave acts, but when an unexpectedly large wave force acts, only the plate block is applied. By breaking or coming off, the porosity increases and the wave force acting on the entire structure can be reduced. Therefore, repairing is required only by replacing the broken or disengaged wave-dissipating member, which makes the repair easier and the repair cost much lower than before. Moreover, the bottom connecting block has a bottom slit, the other connecting blocks have slits that open vertically, and the bottom end of the plate block inserted from the top connecting block slit is the bottom connecting block. With the configuration that the slits are used, the work of stretching the plate block can be done simply by inserting and filling the caulking material.For example, it is much easier than the case of tightening the bolts and nuts and performing the underwater work. Since it is less, work efficiency can be improved, and since bolts and nuts are not used, there is no risk of falling off due to corrosion or loosening.

[Brief description of drawings]

1 to 3 are perspective views showing a procedure for constructing a pile-legged wave-proof structure according to the present invention, and FIG. 4 is a cross-sectional view of a main part thereof.
FIG. 5 is a vertical sectional view of the plate block, and FIG. 6 is a bending moment diagram thereof. 10 …… Pile, 12 …… Coupling block, 12a …… Slit, 15
…… Board block.

Claims (3)

[Claims] 1. A bar-shaped connecting block, which is a wave-dissipating member, is installed between piles erected on a subseabed in a girder-like shape and is laid in multiple stages. , A pile standing wave-proof structure having a horizontally long slit in a corresponding portion between the piles, and a plate block which is a wave breaking member is inserted into the slit and stretched between the upper and lower connecting blocks. object. 2. The slit of the lowermost connecting block has a bottom, and the slits of the connecting blocks other than the lowermost connecting block are bottomless and vertically penetrate, and are inserted from the slits of the uppermost connecting block. 2. The pile standing type wave preventing structure according to claim 1, wherein the lower end of the plate block is received by the slit of the lowermost connecting block. 3. The pile standing wave-proof structure according to claim 1, wherein a caulking material is filled between the slit of the connecting block and the plate block.