JPH0326245B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to support piles for constructing breakwaters in ports and harbors.

Conventionally, this type of breakwater has been constructed by erecting support piles (b) at predetermined intervals on the seabed (a), as shown in Figure 1 (a), and installing breakwater concrete bodies (c) at the upper ends of these support piles (b). ), and a panel (d) of reinforced concrete (RC) or prestressed concrete (PC) is suspended from the bottom of the concrete body (c), or the above construction method is used until the concrete body (c) is fixed. After that, connect the RC or PC panel as shown in Figure 1(b).
Instead of (d), steel sheet pile (e) is connected to the concrete body from the seabed (a).
(c), but in the case of the breakwater obtained by the former construction method,
The RC or PC panels (d) are single-sided beams, which have the disadvantage of being weak in stress, and the breakwaters obtained by the latter construction method use steel sheet piles (e), which has the disadvantage of increasing construction costs. Ta.

The purpose of the present invention is to eliminate these drawbacks and provide a support pile for constructing a breakwater that is strong in terms of stress and can be obtained at low cost.The present invention is characterized by:
A pair of guide plates having substantially J-shaped folded tips are welded at the roots with the folded surfaces of the tips facing each other, and a spring is interposed between the folded edges and the middle part of each guide plate. The tip of the bolt screwed into the nut in the intermediate portion is rotatably tied to the folded portion.

One embodiment of the present invention will be described with reference to FIGS. 2 to 9.

Reference numeral 2a indicates a support pile body made of a steel pipe, and on both sides or one side of the support pile body 2a, there are flexible guide plates 6, 6 made of steel whose tips are folded inward in a J shape as shown in the second figure. Welded at intervals. 7
... 7 is a plate-shaped rib and the guide plates 6, 6
Welded at appropriate intervals on the outer surface of the Also, the folded portion 6a and intermediate portion 6b of each guide plate 6
A spring 9 is fitted between the intermediate portion 6b and a nut 10 is welded to the outside of the intermediate portion 6b.A transparent hole (not shown) is perforated in the folded portion 6a, and a bolt 11 is inserted into the nut 10. The bolt 11 is screwed in, and the tip of the bolt 11 is rotatably connected to the folded portion 6a. Note that 8 indicates a dowel bar welded to the support pile main body 2a.

Next, construction of a breakwater using the support piles 2 having the above configuration will be explained. The support pile 2 and the steel pipe reinforcement pile 4 are
As shown in the figure, they are driven into the seabed 1 at predetermined intervals and fixed. Note that the bolts 11 in each guide plate 6
When the bolt 11 is turned in the pulling direction, the bolt 11 is attached to the nut 10.
The folded part 6a, which is rotatably fixed to the tip of the bolt 11, is pushed outward by the spring 9, and is attached to the intermediate part 6b by a distance of t, as shown by the dotted line in FIG. The gap between the opposing folded parts 6a, 6a is enlarged.

Next, insert both ends of the RC or PC concrete panel 12 between the guide plates 6, 6 and 6, 6 of the adjacent support piles 2, 2 from above as shown in FIGS. 5 and 6.
After inserting the concrete panel 12, loosen the nuts 10 or cut the bolts 11 and push the folded parts 6a, 6a inward by the springs 9, 9. Press down on both ends. This causes the panel 12 and the guide plates 6, 6 and 6, 6 to come into close contact. After that, a steel plate or the like is welded to the lower ends of the guide plates 6, 6 to seal them, and mortar 5 is filled between the guide plates 6, 6 to form a concrete panel 11.
and the support pile 2 are integrated. Finally, the breakwater concrete body 3 is fixed to the upper ends of these support piles 2 and reinforcement piles 4, and the breakwater is completed as shown in FIGS. 7 to 9. Here, as mentioned above, Natsu 10
By loosening the bolts 11 or cutting the bolts 11, the space between the concrete panel 12 and the guide plates 6, 6 is sealed, making construction easier in underwater work, and since each guide plate 6 has a margin of t, the concrete panel 12 can be easily inserted from above, and rotation of the support pile 2 when fixing the support pile 2 and manufacturing errors of the concrete panel 12 can be absorbed.

In addition, when the external force due to waves is small, the giber muscle 7
, mortar 5, etc. are omitted, and both guide plates 6,
The concrete panel 12 may be fixed only by tightening the bolts 9, 9 of 6. Alternatively, the support piles 2...2 and the panels 12...12 may be constructed so as to reach the seabed 1.

As described above, according to the present invention, a pair of J-shaped guide plates are welded to the support body in a facing manner, and the folded portions of these guide plates are staked by the spring force and are displaced outwardly by bolts to face each other. Since the gap between the folded parts can be forcibly widened, a concrete panel can be easily inserted from above between the folded parts that have been forcibly widened between adjacent support piles, and the nuts can be loosened after insertion. Alternatively, if the bolts are cut, the concrete panel can be crimped and fixed between the folded parts by the elasticity of the spring, which is much stronger in terms of stress than the conventional method of simply fixing the concrete panel hanging down. Construction costs can be reduced because sheet piles are not required, and if the concrete panels are made larger and stronger, fewer steel pipe piles need to be driven, prefabricated construction allows for rapid construction, and diagonal pile type breakwaters are also possible. It is particularly useful for curtain wall type breakwaters, etc., and has the effect of being applicable to wall type structures such as self-supporting steel pipe pile type breakwaters, earth retaining seawalls, and barge quays.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a breakwater constructed using the conventional construction method.
Figure 2 is a sectional view of the support pile of the present invention, Figures 3 and 5.
Figure 7 and Figure 7 are cross-sectional views of the breakwater being constructed using the support piles, Figure 4 is an enlarged cross-sectional view of the guide plate of the support piles, and Figure 6 is a concrete plate attached to the support piles. FIG. 8 is a sectional view taken along the line ``-'' in FIG. 7, and FIG. 9 is a sectional view taken along the line ``-'' in FIG. 7. 1... Seabed, 2... Support pile, 3... Wave-break concrete body, 12... Concrete panel.

Claims (1)

[Claims] 1. A pair of guide plates having approximately J-shaped folded tips are welded to the sides of the support pile body at the roots with the folded edges of the tips facing each other,
Construction of a breakwater characterized in that a spring is interposed between the folded part and the middle part of each guide plate, and the tip of a bolt screwed into a nut in the middle part is rotatably tied to the folded part. Support piles for use.