JP3797558B2 - Underwater structure and construction method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underwater structure such as a breakwater, a dike or a wave breakwater, and a method for constructing a precast concrete PC plate.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 12 and 13, as an underwater structure 22 such as a curtain wall body structure 21 using a precast concrete PC plate 20, a pile that engages with a pile 1 that is erected on a water bottom support ground 23. A short precast plate 20 including a plurality of pile engaging portions 11 having through holes 24 and a plate body integrally formed with the engaging portions and introduced with prestress is used, and the precast is used. The pile engaging portion 11 in the plate 20 is provided with a vertical through hole 25 for connecting a plurality of precast plates 20 with a PC steel material that is embedded and disposed over the piles. Such a precast plate The underwater structure 22 using 20 is known (for example, refer patent document 1).
[0003]
Moreover, when attaching the precast plate 20 which has the engaging part 11 for piles to the pile 1, the pile 1 is driven into the water bottom support ground 23 in two rows at predetermined intervals, and the water stop member 26 is passed through the pile 1 of one row, Further, the pile 1 is passed through the pile through-hole 24 of the connected precast PC plate 20, and the upper ends of the opposing piles are connected by a connecting material 27 made of steel or the like, and embedded in the upper end of the precast PC plate 20 in advance. The suspension bolt 28 is fixed to the connecting member 27, and then the upper concrete portion (so that the non-shrink mortar 29 is filled in the gap between the pile 1 and the pile through-hole 24 and the connecting member 27 is embedded further. There is known a construction method for an underwater structure 22 such as a curtain type breakwater 21 in which a superstructure) 30 is made of cast-in-place concrete (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Registered Utility Model No. 3029367 [0005]
[Problems to be solved by the invention]
In the conventional case, prior to the installation of the precast PC plate having the engaging portion, the water-stopping member is inserted into the pile in advance or the bracket is attached to the pile in advance, so that the construction is complicated. At the same time, since the position of the precast PC plate to be attached to the pile is determined in advance on the pile side, if there is a pile driving error, a construction error also occurs at the precast PC plate attachment position, and it is difficult to correct the position. There is a problem that there is no degree of freedom.
[0006]
Further, when the precast PC plate is attached to the middle part of the water depth, the bracket is attached to the pile in advance or by underwater welding. However, in this case, there is a problem that the construction is complicated and the cost is increased.
[0007]
The present invention can install a precast plate having an engagement portion at a predetermined accurate position even if a pile driving error occurs, and prior to installation of the precast plate having an engagement portion, The precast plate having the engaging portion can be installed at a predetermined accurate position without the complicated construction of inserting the member into the pile or attaching the bracket to the pile in advance, and the position correction is easy. It is an object of the present invention to provide an underwater structure having a high degree of freedom in construction and a construction method thereof.
[0008]
[Means for Solving the Problems]
In order to advantageously solve the above-described conventional problems, in the underwater structure of the first invention, the band metal fitting 3 provided with the water stop member 2 disposed outside the pile 1 is spaced apart in the circumferential direction. And an inner engagement piece that can be engaged with the inner circumferential surface of the pile and an inward steadying leg that is engaged with the outer circumferential surface of the pile. A plurality of locking support fittings 7 provided with a portion are arranged and locked on the pile upper end portion 8 at intervals in the circumferential direction, and the upper portions of the respective housings 5 are respectively supported by the locking support fittings 7. Pile penetration that is screwed into the female screw member 9 so that the band metal fitting 3 is supported so that the position of the band metal fitting 3 can be adjusted in the vertical direction, and whose radial dimension is larger than the outer dimensions from the pile center of the housing 5 and the locking support metal fitting 7 A precast PC plate 12 having a pile engaging portion 11 having a hole 10 is attached to the pile 1. Characterized in that while being arranged to be threaded is placed on the water-shutoff member 2.
[0009]
Further, in the second invention, in the underwater structure of the first invention, the casing is composed of a PC steel rod, and both ends of the PC steel rod are supported via an insulating material and are insulated so as not to be energized. It is arranged.
[0010]
Moreover, in the construction method of the underwater structure of the third invention , the band metal fitting 3 provided with the water stop member 2 arranged on the outer side of the pile 1 is arranged at intervals in the circumferential direction, and the male screw part is formed on the upper part. A plurality of engagements including an inner engagement piece 14 that is supported by a plurality of housings 5 having 4 and can be engaged with the inner peripheral surface of the pile, and an inward steadying leg portion 17 that is engaged with the outer peripheral surface of the pile. The stop support fittings 7 are arranged and locked on the pile upper end portion 8 at intervals in the circumferential direction, and the upper portions of the respective casings 5 are respectively screwed into the female screw members 9 supported on the lock support fittings 7. Then, after supporting the band metal fitting 3 in such a manner that the position thereof can be adjusted in the vertical direction, it has a pile through-hole 10 having a radial dimension larger than the outer dimensions from the pile center of the frame 5 and the locking support metal fitting 7. The precast PC plate 12 with the pile engaging portion 11 is inserted into the pile 1 Characterized in that it placed on the water-shutoff member with placed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in detail based on the illustrated embodiment.
FIGS. 1-8 shows the procedure in the case of constructing the underwater structure 22 which has the curtain wall 13 in the front surface of one Embodiment of this invention shown in FIG. 9, First, as shown in FIG. A band metal fitting 3 provided with a water stop member 2 is arranged on the outside of the front pile 1 made of a steel pipe pile driven into the water bottom support ground 23 and is arranged at intervals in the circumferential direction on the outside of the pile 1. It supports through a plurality of locking support fittings 7 arranged and locked at intervals in the circumferential direction on a plurality of housings 5 having a male threaded portion 4 and a pile upper end portion 8.
[0012]
As shown in FIG. 2, the locking support fitting 7 is integrally connected to the inner engagement piece 14 that can be engaged with the inner peripheral surface of the pile 1, and is placed on the upper end surface of the pile 1. In addition, a support portion 15 having a housing insertion hole 16, an outer plate 18 provided integrally therewith, and an inward steadying leg portion 17 engaged with the outer peripheral surface of the pile 1 are provided inside the outer plate 18. The pile engaging portion 6 is constituted by the inner engaging piece 14, the support portion 15, and the outer plate 18. When using the locking support fitting 7 having the inner engagement piece 14 that can be engaged with the inner peripheral surface of the pile 1 and the inward steadying leg portion 17 that is engaged with the outer peripheral surface of the pile 1, Since the locking support fitting 7 can be installed at a predetermined position on the upper end portion of the steel pipe pile 1 without being displaced in the radial direction, it is possible to prevent the frame 5 from being steady and to support the band fitting 3 in a stable state. can do.
[0013]
The housing 5 may be a male screw member (for example, a PC steel bar, a threaded deformed steel bar, etc.) having male screw parts 4 at both upper and lower ends, and is preferably a male screw member such as a PC steel bar having a different total diameter. More preferably, it is a full-screw different-diameter PC steel rod coated with resin coating over the entire length and subjected to rust prevention treatment, and the housing 5 made of a total-screw different-diameter PC steel rod coated with resin coating in this way. Insulating effect can also be expected when using.
[0014]
The locking support bracket 7 is a bracket that can be engaged and placed on the upper end portion of the pile 1 by itself. The locking support bracket 7 includes an upper portion of the housing 5 and the locking support bracket 7. A female screw member 9 made of a nut is supported through a seat rod 19 having an insulating rubber plate 19a fixed to the lower surface in a state of being inserted into the housing insertion hole 16 through a gap, and is screwed into the female screw member 9. The water stop member 2 and the band metal fitting 3 are supported at the lower part of the housing 5 that is supported in this manner.
[0015]
The seat collar 19 (and the seat collar 19b described later) having the insulating rubber plate 19a fixed to the lower surface (the upper surface in the case of the seat collar 19b) is provided with a connecting member 27 for connecting the pile head to the pile 1. In order to prevent the casing 5 made of a different diameter PC steel rod from being contacted and broken by welding current when it is fixed by resistance welding, a seat hanger 19 (19b) provided with an insulating rubber plate 19a is used. (See FIGS. 5b-d). And, when combined with the casing 5 made of a PC screw with a total screw different diameter and coated with resin coating over the entire length and subjected to rust prevention, an insulating effect by resin coating can be expected.
[0016]
As shown in FIGS. 3 and 4, the band metal fitting 3 is formed in a cylindrical shape by connecting the connection flanges 31 in a semi-cylindrical band metal fitting body 32 having a connection flange 31 with bolts and nuts 33. Each band metal fitting 32 is provided with a pair of vertical steel plates 35 parallel to each other and brackets 34 each having a support steel plate 36 fixed over the lower surface thereof at equal angular intervals. The support steel plate 36 is provided with a vertical hole through which the housing 5 is inserted through a gap, and the male screw portion 4 at the lower end of the housing 5 is provided with an insulating rubber plate that engages with the lower surface of the support steel plate 36. A female screw member 9a is screwed in a state in which a countersink 19b having an upper surface 19a is interposed, and the band metal fitting 3 and the like are supported via the female screw member 9a. The inner diameter dimension of the band fitting 3 formed in a cylindrical shape is set to be slightly larger or slightly larger than the outer diameter dimension of the pile 1, and the vertical position of the band fitting 3 with respect to the pile 1 by rotating the female screw member 9. Therefore, the male screw portion 4 is set to be long.
[0017]
A steel support plate 37 for receiving a precast PC plate previously provided with a housing insertion hole is placed on the upper portion of each bracket 34 and fixed by welding or the like. A water stop member 2 composed of a rubber sponge 2a having a slit or a through hole and a rubber plate 2b is placed.
[0018]
The inner diameter dimension of the water stop member 2 is set slightly smaller than the outer diameter dimension of the pile 1, and the outer surface of the pile 1 and the inner diameter side of the water stop member 2 are set by the water stop member 2 placed on the support plate 37. It is structured to prevent leakage of mortar from
[0019]
As described above, a plurality of locking support fittings 7 are provided on the upper portion of the housing 5 and transported in a unitized state including the water stop member 2 and the band fitting 3 on the lower portion of the housing 5. The locking support fitting 7 may be locked at the upper end.
[0020]
As shown in FIG. 5 (a), the external radius r from the pile center axis C of each locking support fitting 7 attached to the pile 1 made of a steel pipe pile is the same as that in the precast PC plate 12 attached to the pile 1. It is set to a dimension smaller than the radial dimension R of the pile through hole 10. That is, the radial dimension of the pile through hole 10 in the precast PC plate 12 is the pile through hole 10 having a larger radial dimension R than the outer radial dimension r from the pile center axis C of the frame 5 and the locking support fitting 7. Has been.
[0021]
As described above, the position adjustment of the band metal fittings 3 supported by the respective locking support fittings 7 and the housings 5 that are locked to the respective piles 1 is performed by appropriately rotating the female screw member 9 to obtain a predetermined value of the pile 1. Adjust the position. Thereafter, on the water stop member 2 on each support plate 37, a precast PC plate 12 having a pile through hole 10 having a large radial dimension in the pile engaging portion 11 is attached thereto as shown in FIG. The piles 47 are hung and conveyed by the hanging metal fittings 47 and the hanging ropes 48 from cranes or the like, and are placed so that the piles 1 are respectively stored in the pile insertion holes 10. Although not shown in the figure, the precast PC plate 12 is preliminarily embedded with a plurality of precast PC plate blocks 38 having a short vertical dimension in advance across the connecting through-holes 25 as in the prior art. It is good to constitute by connecting with a PC steel rod for connection.
[0022]
In addition, as shown in FIG. 8, when the guide member 40 that also serves as a detent member or a positioning member is attached to the outer peripheral surface of the pile 1 (or to either the inner peripheral surface of the pile through-hole 10), The precast PC plate 12 can be installed on the band metal fitting 3 at a predetermined position and a predetermined posture.
[0023]
As described above, with the precast PC plate 12 placed on the water-stopping member 2, mortar (or concrete) 39 or the like is placed between the pile insertion hole 10 and the pile 1, filled and cured. , Attach to the pile 1 and integrate. If necessary, the mortar 39 can be filled and cured in a dry state between the pile insertion hole 10 and the pile 1.
[0024]
Moreover, between the latching support metal fittings 7 in the upper end part of the pile 1, the connection material 27 which consists of I-shape steel is mounted over the steel pipe pile 1 and the back steel pipe pile 1, and each pile 1 and connection material are mounted. 27 is fixed by resistance welding, and the connecting material 27 is attached to each pile 1. At the time of this resistance welding, there is a possibility that the casing 5 made of a different diameter PC steel rod may be broken by electric contact. Therefore, between the female screw member 9 screwed into the upper end portion of the casing 5 and the locking support fitting 7, A seat rod 19b having an insulating rubber plate 19a is interposed between the female screw member 9a, which is screwed into the lower end portion of the housing 5, and a bearing steel plate 36. Is interposed to prevent the casing 5 from being energized and to prevent the casing 5 from being broken by electric contact. Thus, by interposing an insulating material such as the insulating rubber plate 19a, the casing 5 made of a different-diameter PC steel rod can be disposed in an insulated state.
[0025]
Thereafter, as shown in FIG. 9, a support beam member 41 is attached on the connecting member 27, and supported via the support beam member 41 and the suspension support member 42 and the suspension member 46 attached thereto. A precast concrete burial support plate 43 is installed on the precast PC plate 12, and a reinforcing bar and surrounding formwork (not shown) are installed on the precast concrete burial support plate 43, and then the supporting beam material. The upper work concrete 44 is placed up to the upper surface of the connecting material 27 on the lower surface of 41. In this state, since the support beam member 41 can be removed and diverted, after removing the support beam member 41 and further installing a reinforcing bar and a surrounding formwork (not shown), placing the superstructure concrete 45, The underwater structure 22 including the curtain wall structure 21 is completed.
[0026]
As described above, when the precast concrete burying support plate 43 is used, its weight is relatively heavy, so the precast concrete burying support plate 43 is not lifted by normal waves. The installation work of the formwork can be easily performed, and the construction accuracy can be improved. If the wooden formwork is used without using the precast concrete buried support plate 43, the wooden formwork may be lifted by normal waves, so the construction accuracy may be lowered. It is preferable to use a buried support plate 43.
[0027]
(Second Embodiment)
10 and 11 show a second embodiment of the present invention. In this embodiment, the steel pipes adjacent to each other in the left-right direction in the front steel pipe pile 1 inclined to the water bottom support ground 23 are shown. A precast PC plate 12 provided with a curtain plate provided in an inclined state on the pile 1 is attached in the same manner as in the above embodiment, and the rear side is inclined and placed on the water bottom support ground 23. A precast PC plate 12 is attached to each steel pipe pile 1 adjacent to each other in the left-right direction in the same manner as in the above embodiment.
[0028]
In the case of this embodiment, in order to arrange the frame 5 in parallel with the center axis of the steel pipe pile 1, a support end face 46 perpendicular to the pile center axis C is provided at the upper end of the steel pipe pile 1 as shown in FIG. In order to provide, the notch step part 47 is provided in the upper end part of the steel pipe pile 1, Other structures are the same as that of the said embodiment.
[0029]
In addition, in the case of each said embodiment, when installing the precast PC plate 12 in the steel pipe pile 1, the precast PC plate 12 is suitably suspended and dropped by two-point suspension or the like in a vertical state or an inclined state.
[0030]
The casing 5 is preferably a casing 5 that has been previously coated with an anticorrosion resin. If the casing 5 is a PC steel rod having a different diameter, it can be easily applied to the female screw members 9 and 9a such as nuts even if the anticorrosion resin is applied. The screw can be screwed in, and the position of the female screw member 9 can be easily adjusted, and the mounting is easy.
[0031]
When the precast PC plate 12 is installed at a predetermined distance from the bottom support ground 23 as in the above embodiment, the curtain wall is capable of exchanging seawater between the offshore side and the land side below the precast PC plate 12. It becomes the water area structure 22 which has a type | formula wave-dissipating function, and becomes the water area structure 22 which has the curtain wall type wave-dissipating function by the double curtain wall which has the curtain wall 13 back and forth like 2nd Embodiment.
[0032]
When practicing the present invention, the pile 1 may be a pile other than a steel pipe pile.
[0033]
【The invention's effect】
According to the present invention, even if a pile driving error occurs, the position of the band metal fitting is easily adjusted, and the lower end portion of the precast PC plate having the engaging portion is installed at a predetermined accurate position such as an intermediate portion in water. Prior to the installation of the precast plate having the engaging portion as in the prior art, without inserting the water-stopping member in advance into the pile or attaching the bracket to the pile in advance, The precast plate having the engaging portion can be installed at a predetermined accurate position, and it is possible to provide an underwater structure and a construction method of the underwater structure with a high degree of freedom in construction, in which position correction is easy.
[0034]
Moreover, since the precast PC plate which has a pile through-hole which has a radial direction dimension larger than the external dimension from the pile center axis line of a housing and a latching support metal fitting, and provided with the engaging part for piles is used beforehand, Even if the locking support fitting and the casing projecting to the outside are arranged, it is possible to provide an underwater structure and a construction method of the underwater structure with a high degree of freedom of construction that can easily install the precast PC plate.
[0035]
Moreover, since it is the latching support bracket provided with the inner side engagement piece which can be engaged with the inner peripheral surface of a pile, and the inward steadying leg part engaged with the outer peripheral surface of a pile, this is set to the upper end part of a pile. Since it can be installed at a predetermined position without being displaced in the radial direction, it is possible to prevent the housing from being shaken and to support the band fitting in a stable state.
Moreover, if the frame is composed of a PC steel rod, and both ends of the PC steel rod are supported via an insulating material and are arranged in a state where they cannot be energized, the connecting material is piled up by resistance welding. In the case of mounting, it is possible to prevent electrical contact of the PC steel rod during resistance welding, and to eliminate the possibility that the casing made of the PC steel rod will break due to electrical contact.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view showing a state in which a band fitting is supported via a locking support fitting locked to an upper end portion of a steel pipe pile and a housing supported by the locking support fitting.
2A is an enlarged vertical side view showing a part of the upper part of FIG. 1, FIG. 2B is a front view thereof, and FIG. 2C is a plan view thereof.
FIG. 3 is a partially longitudinal side view showing an enlarged part of the lower part of FIG. 1;
4A is a cross-sectional view taken along line AA in FIG. 3, and FIG. 4B is a cross-sectional view taken along line BB in FIG.
5A is a plan view showing the relationship between a locking support fitting installed at the upper end of a pile, a connecting material, and a pile through hole in a precast PC plate, and FIGS. 5B to 5D are for insulation. FIG. A seat with a rubber plate is shown, wherein (b) is a plan view, (c) is a front view, and (d) is a bottom view.
FIG. 6 is a longitudinal side view showing a state in which a precast PC plate having a pile through hole is placed on a water stop member on a support plate and a connecting material is installed at the upper end of a steel pipe pile.
FIG. 7 is a longitudinal side view of the vicinity of the band fitting showing a state in which mortar is filled between the steel pipe pile and the inner peripheral surface of the pile through hole.
8A is a longitudinal side view showing a relationship between a guide member attached to a steel pipe pile and a pile through hole in a precast PC plate, and FIG. 8B is a cross-sectional plan view of FIG. 8A.
FIG. 9 is a partially longitudinal side view showing the underwater structure according to the first embodiment of the present invention.
FIG. 10 shows a relationship with a locking support fitting when a notch step is provided at the upper end of a steel pipe pile driven into the bottom support ground in an inclined state, and (a) is a longitudinal side view. (B) is a front view thereof, and (c) is a plan view thereof.
FIG. 11 is a partially longitudinal side view showing an underwater structure according to a second embodiment of the present invention.
FIG. 12 is a longitudinal front view showing an attachment portion between a precast PC plate and a pile in the underwater structure according to the first embodiment of the present invention.
FIG. 13A is a perspective view showing a short precast PC plate block, and FIG. 13B is a perspective view showing one embodiment when a plurality of precast PC plate blocks are connected to form a precast PC plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile 2 Water stop member 3 Band metal fitting 4 Male thread part 5 Housing 6 Pile latching part 7 Locking support metal part 8 Pile upper end part 9 Female thread member 9a Female thread member 10 Pile through-hole 11 Pile engagement part 12 Precast PC plate 13 Curtain Wall 14 Inner engagement piece 15 Support portion 16 Housing insertion hole 17 Inward steadying leg portion 18 Outer plate 19 Seat glass 19a Insulation rubber plate 19b Seat glass 20 Precast concrete PC plate 21 Curtain wall structure 22 Underwater structure 23 Water bottom support ground 24 Pile through hole 25 Through hole 26 Water stop member 27 Connecting material 28 Suspension bolt 29 Non-shrink mortar 30 Upper concrete part (upper construction)
31 Connecting flange 32 Band metal fitting body 33 Bolt 34 Bracket 35 Vertical steel plate 36 Support steel plate 37 Support plate 38 Short precast PC plate block 39 Mortar 40 Guide member 41 Support beam material 42 Suspension support member 43 Precast concrete buried support plate 44 Superstructure concrete 45 Superstructure concrete 46 Suspension material 47 Suspension bracket 48 Suspension rope

Claims (3)

Band fittings with water-stopping members arranged on the outside of the pile are arranged at intervals in the circumferential direction and supported by multiple housings with male threaded parts at the top, and can engage with the inner peripheral surface of the pile A plurality of locking support metal fittings having an inner engagement piece and an inward steadying leg that is engaged with the outer peripheral surface of the pile are arranged and locked at a circumferentially spaced position on the upper end of the pile, The upper part of each housing is screwed into a female screw member supported by the locking support metal, and the band metal is supported so that its position can be adjusted in the vertical direction, and the pile of the housing and the locking support metal A precast PC plate provided with an engaging portion for a pile having a pile through-hole having a radial dimension larger than the outer dimension from the center is disposed so as to be inserted into the pile and placed on the water stop member. An underwater structure characterized by   2. The underwater according to claim 1, wherein the casing is composed of a PC steel rod, and both ends of the PC steel rod are supported via an insulating material and are insulated so as not to be energized. Structure. Band fittings with water-stopping members arranged on the outside of the pile can be engaged with the inner peripheral surface of the pile by supporting them with multiple housings that are arranged at intervals in the circumferential direction and that have male threaded parts on the top. An inner engagement piece and a plurality of locking support fittings provided with inward steadying leg portions engaged with the outer peripheral surface of the pile are arranged at intervals in the circumferential direction at the upper end of the pile and locked. The upper part of each housing is screwed into a female screw member supported by the locking support bracket, and the band bracket is supported so that the position of the band bracket can be adjusted in the vertical direction. A precast PC plate having a pile through-hole having a radial dimension larger than the outer dimension from the center of the pile and provided with an engaging portion for the pile is arranged so as to be inserted through the pile and placed on the water-stopping member. The construction method of the underwater structure characterized by the above-mentioned.

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