JP6909959B2 - How to build pile support structure - Google Patents

Description

The present invention relates to a method for constructing a pile support structure in which a concrete superstructure is joined to a pile head such as a pier.

Conventionally, in the construction of pile support structures such as piers, after placing a plurality of steel pipe piles, each work such as scaffolding installation, support work installation, pile head treatment work, etc. is performed at sea, and between the steel pipe piles. Formwork was formed between the steel pipe piles using the overlaid support work, and concrete superstructure was formed by casting concrete in place.

In the construction of this pile support structure, a series of construction work is performed at sea, so if the sea conditions and weather conditions are bad, the steel pipe pile may swing due to waves, etc., which may interfere with each work. After placing the steel pipe piles, the steel pipe piles were connected with a temporary steel material so that the steel pipe piles would support each other.

Further, when the support works are erected between the steel pipe piles, the steel pipe piles are supported with each other together with the above-mentioned temporary steel material or by the support work instead of the temporary steel material.

Further, in recent years, one or a plurality of precast concrete ready-made members (hereinafter referred to as precast concrete members) constituting the superstructure (beam part) are manufactured in advance at a factory or a manufacturing yard on land and transported to a construction site. However, a construction method in which the precast concrete member is supported on the head of the steel pipe pile using a crane or the like, and in that state, cast-in-place concrete is placed between the pile head and the precast concrete member to join them. Hereinafter, the PCa block method) is used to shorten the construction period and improve the quality (see, for example, Patent Document 1).

When the superstructure is composed of a plurality of precast concrete members, cast-in-place concrete is placed between the precast concrete members to connect the precast concrete members.

In this PCa block construction method, by dividing into a plurality of precast concrete members, a small-scale device such as a crane vessel for lifting and transferring each precast concrete member may be used, and the cost can be reduced and a narrow water area can be reduced accordingly. It also has the advantage that it can be installed even in places where the movement of large vessels is restricted.

On the other hand, in this type of pile support structure, each steel pipe pile is connected by a reinforcing steel material called a strut, and the steel pipe piles are supported by each other to increase horizontal rigidity and horizontal strength (hereinafter referred to as a strut method). ) Is known (see, for example, Patent Document 2).

In this strut method, the horizontal rigidity and horizontal strength of each pile are increased, so that the cross section of the steel pipe pile can be reduced, the number of piles can be reduced, and the cost can be reduced.

Japanese Unexamined Patent Publication No. 2001-288725 Japanese Unexamined Patent Publication No. 9-235714

However, in the PCa block construction method as described above, it is not necessary to bridge the support work between the steel pipe piles in order to install the formwork, and there is an advantage that the cost can be reduced and the construction period can be shortened accordingly. However, on the other hand, if the sea conditions and weather conditions are bad, the steel pipe piles may swing due to waves, etc., so it is necessary to connect each steel pipe pile with a temporary steel material. There is a problem that the advantage of the PCa block method, which is that the above can be omitted, is not fully utilized.

On the other hand, the conventional strut method mainly reinforces in the direction in which an external force due to waves or the like is expected to act, and is not expected to be used in combination with the PCa block method.

Therefore, in view of such conventional problems, the present invention has been made for the purpose of providing a method for constructing a pile support structure capable of efficiently installing a precast concrete member and reinforcing the structure. It is a thing.

The feature of the invention according to claim 1 for solving the above-mentioned conventional problems is that after placing a plurality of piles at intervals in the normal direction and the direction perpendicular to the normal of the pile support structure to be constructed. , A pile support structure in which a precast concrete member is joined to the pile head, a cast- in-place concrete portion is formed between the precast concrete members supported by the pile, and the precast concrete members supported by the pile are connected to each other. In the construction method, a reinforcing member having a plurality of fitting portions to be fitted to the pile and a connecting reinforcing member having a certain length for connecting the fitting portions is used, and the cast-in-place concrete portion to be formed later is formed. In, the adjacent piles are connected by the reinforcing member, and the adjacent piles are supported and reinforced with each other, and then the precast concrete member is joined to the pile , and cast-in-place concrete is placed between the precast concrete members. There is a method of constructing a pile support structure for forming the cast-in-place concrete portion.

The feature of the invention according to claim 2 is that, in addition to the configuration of claim 1, the reinforcing member is a linear type in which fitting portions are arranged in series, a triangular type in which fitting portions are arranged at three corners, and fitting portions at four corners. One of the rectangular shape and the U-shape arranged in the above is appropriately selected and used according to the position of the cast-in-place concrete.

In the method for constructing a pile support structure according to the present invention, as described above, after placing a plurality of piles at intervals in the normal direction and the direction perpendicular to the normal line of the pile support structure to be constructed, the pile head thereof. In a method for constructing a pile support structure in which a precast concrete member is joined to a portion, a cast- in-place concrete portion is formed between the precast concrete members supported by the pile, and the precast concrete members supported by the pile are connected to each other. Adjacent piles under the cast-in-place concrete portion to be formed later by using a reinforcing member having a plurality of fitting portions to be fitted to the pile and a connecting reinforcing member having a certain length to connect the fitting portions. The space is connected by the reinforcing member, and the adjacent piles are supported and reinforced with each other, and then the precast concrete member is joined to the pile , and cast-in-place concrete is placed between the precast concrete members to form the place. By forming the cast concrete portion, it is possible to easily position the pile without using a steel material for support work or temporary fixing, and it is possible to improve the rigidity of the entire pile support structure.

Further, in the present invention, the reinforcing member is any one of a linear type in which fitting portions are arranged in series, a triangular type in which fitting portions are arranged in three corners, and a rectangular type or U-shaped type in which fitting portions are arranged at four corners. By appropriately selecting and using the above-mentioned cast-in-place concrete according to the position of the cast-in-place concrete, it is possible to easily cope with the arrangement of various precast concrete members by combining a plurality of reinforcing members having a patterned shape.

(a) is a side view showing an example of a pile support structure constructed by the method for constructing a pile support structure according to the present invention, and (b) is a view taken along the line AA. It is a plan view which shows the reinforcing member in FIG. 1, (a) is a linear type, (b) is a triangular type, (c) is a rectangular type, and (d) is a U-shaped. A plan view showing an attached state of the reinforcing member, (b) is a vertical sectional view thereof. (A) is a side view showing a state at an initial stage of a reinforcing member attaching work in the method for constructing a pile support structure according to the present invention, and (b) is a plan view of the same. (a) is a side view showing a state at a later stage of the reinforcing member attaching work of the same as above, and (b) is a plan view of the same. (a) is a side view showing a state of the installation work of the precast concrete member of the same as above, and (b) is a plan view of the same.

Next, an embodiment of the method for constructing a pile support structure according to the present invention will be described based on the examples shown in FIGS. 1 to 6.

FIG. 1A is a side view of the pile support structure 1 constructed by the present invention, and FIG. 1B is a view taken along the line AA. The right side in FIG. 1A is the land side, the left side is the offshore side, and the normal direction and the normal perpendicular direction of the pile support structure 1 for constructing the directions shown in FIG. 1B, respectively (hereinafter, It is explained as (called the normal direction).

As shown in FIG. 1, the pile support structure 1 includes a plurality of steel pipe piles 3, 3 ... and steel pipe piles 3, 3 ... The precast concrete members 4, 4 ... Supported by the beam and the cast-in-place concrete 11 for connecting the precast concrete members 4, 4 are provided, and the beam portion 5 is formed by the precast concrete members 4, 4, ... And the cast-in-place concrete 11. A floor slab portion 6 is formed on the beam portion 5, and the beam portion 5 and the floor slab portion 6 form a superstructure 7.

Further, the pile support structure 1 is provided with a plurality of fitting portions 8, 8 ... To be fitted with the steel pipe pile 3, and a connecting reinforcing member 9 having a constant length for connecting the fitting portions 8, 8. After the steel pipe piles 3, 3 ... Are driven into the bottom ground 2 using the reinforcing members 10a to 10d, the predetermined adjacent steel pipe piles 3, 3 are connected by the reinforcing members 10a to 10d, and each precast is in that state. The concrete members 4, 4 ... Are joined to the pile head.

As shown in FIG. 1, the beam portion 5 includes a plurality of precast concrete members 4, 4 ... And cast-in-place concrete portions 11, 11 ... For connecting the precast concrete members 4, 4 to each other, and is formed in a grid pattern. Has been done.

Each of the precast concrete members 4, 4 ... Is provided with sheath pipes 13, 13 inside holes having an open lower surface, and the support members arranged in the sheath pipes 13, 13 are supported by the pile head of the steel pipe pile 3. A filler such as grout is cast between the sheath pipes 13 and 13 that are temporarily supported by the pile and the pile head so as to be joined to the pile head.

Further, the precast concrete member 4 is formed in a beam shape in which sheath pipes 13 and 13 are arranged at intervals, and is supported over adjacent steel pipe piles 3, 3 ....

The beam portion 5 is formed in a grid pattern by combining the precast concrete members 4, 4 ... And placing the cast-in-place concrete portion 11 between the precast concrete members 4, 4 adjacent to each other.

The sheath pipes 13 and 13 are formed in a tubular shape and are integrated with the precast concrete member 4 in a state of being inserted into the pile insertion portion. As shown in the figure, the length of the sheath tube 13 is limited to one formed longer than the height (thickness in the vertical direction) of the precast concrete member 4 and the lower side protruding from the lower surface of the precast concrete member 4. Instead, the precast concrete member 4 may be formed to be about the height (thickness in the vertical direction) or short.

Although not particularly shown, the support member is made of, for example, H-shaped steel or the like, and is arranged so as to cross the inside of the sheath pipes 13 and 13 in the radial direction at a predetermined height position from the lower ends of the sheath pipes 13 and 13. The members are supported by the pile heads of the steel pipe piles 3, 3 ..., And the precast concrete members 4, 4 ... Can be temporarily supported by the pile heads of the steel pipe piles 3, 3 ....

As shown in FIG. 2, the reinforcing members 10a to 10d are a linear type 10a in which fitting portions 8 and 8 are arranged in series, a triangular type 10b in which fitting portions 8 and 8 ... Are arranged at three corners, and fitting portions 8 and 8. It is provided with a rectangular shape 10c or a U-shaped 10d in which ... Are arranged at the four corners, and either of them is appropriately selected and used. Note that FIGS. 1 (b) and 2 have hatches for convenience so that the reinforcing members 10a to 10d can be easily identified.

As shown in FIG. 3, the fitting portion 8 is formed in a cylindrical shape having a diameter larger than the diameter of the steel pipe pile 3 and is supported by a support member 17 fixed to the steel pipe pile 3 by welding or the like.

Further, the fitting portion 8 has locking members 14, 14 ... Protruding on its inner peripheral portion, and the steel pipe piles 3, 3 ... have an engaging convex body 15 such as a shear key projecting on its outer peripheral surface. By filling the fitting portion 8 with the filler 16 such as mortar between the fitting portion 8 and the steel pipe pile 3, the fitting portion 8 is firmly fixed to the steel pipe pile 3 at a predetermined height position. It has become.

In addition to the stud shape shown in FIG. 3, the locking members 14, 14 ... May be a shear key or the like obtained by welding a steel rod in the circumferential direction.

The length of the connecting reinforcing material 9 is set according to the distance between the steel pipe piles 3 and 3 to be attached, respectively, and the connecting reinforcing material 9a for the normal direction having the same length as the distance perpendicular to the normal line between the piles 3 and 3. , The normal connecting reinforcement 9b having the same length as the normal distance between the piles 3 and 3, and the diagonal connecting reinforcing material 9c having the same length as the diagonal distance between adjacent piles.

The lengths of the connecting reinforcing members 9a to 9c are not limited to those shown in this embodiment and can be freely set. For example, the connecting reinforcing member 9a for the normal direction and the connecting reinforcing member 9b for the normal direction can be set freely. May be the same length as, or the connecting reinforcing member 9a for the normal direction may be longer than the connecting reinforcing member 9b for the normal direction.

Then, each of the reinforcing members 10a to 10d has fitting portions 8, 8 by combining the arrangement of the fitting members 8, 8 ... And the connecting reinforcing members 9a to 9c connecting the fitting members 8, 8 with each other. A linear type 10a in which the fitting portions 8 and 8 are arranged in series, a triangular type 10b in which the fitting portions 8 and 8 are arranged at three corners, and a rectangular type 10c or a U-shaped type 10d in which the fitting portions 3, 3 ... Are arranged at the four corners. ..

The reinforcing members 10a to 10d are attached to the lower side of the sheath pipe 13 in a two-stage arrangement according to the arrangement of the precast concrete members 4 and 4.

Next, a specific method for constructing the pile support structure 1 will be described.

First, as a preliminary preparation, the configurations of the precast concrete members 4, 4 ... Each precast concrete member 4, 4 ... Is molded in the yard.

On the other hand, in consideration of the arrangement of the precast concrete members 4, 4 ... And the arrangement of the cast-in-place concrete portions 11, 11 ..., the reinforcing members connecting the steel pipe piles 3, 3 ... Appropriately select from mold 10c or U-shaped 10d, and manufacture each necessary reinforcing member 10a to 10d in advance at a factory or the like.

For the selection of the reinforcing members 10a to 10d, it is confirmed whether the cast-in-place concrete portions 11, 11 ... Are interposed between the steel pipe piles 3, 3 ... Adjacent to each other in the normal direction and the normal direction, and the cast-in-place concrete portion 11 is selected. , 11 ... The connecting reinforcing members 9a to 9c of the reinforcing members 10a to 10d are always located underneath, and the reinforcing members 10a to 10d are combined so that the reinforcing members 10a to 10d can be reinforced most rationally.

For example, when the precast concrete members 4, 4 ... Are arranged as shown in FIG. 1, if the rectangular 10c and the triangular 10b are arranged at the corners, the portions connected by the precast concrete members 4, 4 ... Since the reinforcing connecting member 9 is arranged, it is most rational to arrange the linear type.

In this way, it is rational to superimpose the arrangement of the cast-in-place concrete portions 11, 11 ... And the shapes of the reinforcing members 10a to 10d, and comprehensively consider the overlap of the adjacent reinforcing members 10a to 10d. Determine the placement.

Next, steel pipe piles 3, 3 ... Are placed on the bottom ground 2 at predetermined intervals in the normal direction and the normal direction, respectively.

At that time, each of the placed steel pipe piles 3, 3 ... Is in a state of being erected independently, and is in a state in which waves and other external forces act.

Therefore, first, as shown in FIG. 4, each reinforcing member 10a to 10d is attached to a predetermined arrangement on the lower stage side, the steel pipe piles 3, 3 ... Are connected to each other, and the adjacent steel pipe piles 3, 3 are supported by each other. In addition, the steel pipe piles 3, 3 ... Are positioned with each other.

In the mounting work of the reinforcing members 10a to 10d, the reinforcing members 10a to 10d were mounted so as to straddle the reference steel pipe piles 3 and 3, and the steel pipe piles 3 and 3 were reinforced by supporting each other and then reinforced. The positions of the steel pipe piles 3, 3 ... Adjacent to each other in the normal direction and the direction perpendicular to the normal are adjusted according to the positions of the steel pipe piles 3, 3 ...

To adjust the position of the steel pipe piles 3, 3 ..., For example, one end of the chain block is supported by the already reinforced steel pipe piles 3, 3 ..., and the pile head of the other steel pipe piles 3, 3 ... Is supported via the chain block. Align by pulling.

Then, the reinforcing members 10a to 10d are attached so that the pile heads of the adjacent steel pipe piles 3 and 3 are connected in that state.

Then, the position adjustment based on the reinforced steel pipe pile 3 and the connecting operation of the reinforcing members 10a to 10d are sequentially repeated to attach the reinforcing members 10a to 10d as shown in FIG.

Similarly, as shown in FIG. 5, each reinforcing member 10a to 10d is attached to a predetermined arrangement on the upper stage side with reference to the pile reinforced by the reinforcing material 10a to 10d attached to the lower stage side, and each steel pipe pile. The steel pipe piles 3, 3 ... Are connected to each other, the adjacent steel pipe piles 3, 3 are supported from each other, and the steel pipe piles 3, 3 ... Are positioned from each other.

Then, each fitting portion 8 of each reinforcing member 10a to 10d is filled with a filler 16 such as mortar, and each reinforcing member 10a to 10d is fixed to the steel pipe pile 8.

Next, the precast concrete members 4, 4 ... Are transferred to the construction site by a crane vessel or the like, the precast concrete members 4, 4 ... Are lifted by a crane, and the positions of the sheath pipes 13 and 13 are matched as shown in FIG. Suspend in a state that matches each steel pipe crane 3, 3 ...

At that time, since the reinforcing members 10a to 10d are attached across the steel pipe piles 3, 3 ..., The steel pipe piles 3, 3 ... Are maintained at predetermined intervals and are supported by each other to swing. Since it is prevented, it can be easily aligned and the precast concrete members 4, 4 ... Can be hung efficiently.

Then, when the sheath pipes 13 and 13 are fitted to the outside of the pile heads of the steel pipe piles 3, 3 ..., The support members are supported by the pile heads, and the precast concrete members 4, 4 ... Temporarily supported.

Next, as shown in FIG. 6, in a state where the precast concrete members 4, 4 ... Are temporarily supported on the pile head, a grout or the like is formed in the gap between the sheath pipes 13, 13 and the steel pipe piles 3, 3 ... Fill with a filler, and join the precast concrete members 4, 4 ... To the pile heads of the steel pipe piles 3, 3 ...

Further, if necessary, filled concrete made of cast-in-place concrete is placed on the pile head of the steel pipe pile to complete the installation of the precast concrete members 4, 4 ...

Then, after performing the above-mentioned joining work of the precast concrete members 4, 4 ... For each of the steel pipe piles 3, 3 ..., Reinforcing bars and the like are arranged between the adjacent precast concrete members 4, 4 and a formwork is installed. As shown in FIG. 1, cast-in-place concrete is cast to form cast-in-place concrete portions 11, 11 ... For connecting the precast concrete members 4, 4 ...

At that time, since the reinforcing connecting members 9 of the reinforcing members 10a to 10d are always straddled between the steel pipe piles 3 and 3 that support the precast concrete members 4 and 4 arranged on both sides of the cast-in-place concrete portion 11. , The space between the precast concrete members 4 and 4 is maintained at a predetermined interval, and cast-in-place concrete can be cast without error.

Then, by curing and solidifying the cast-in-place concrete, a grid-like beam portion 5 supported by the steel pipe piles 3, 3 ... Is formed, and a cast-in-place concrete or a precast floor plate is installed on the beam portion 5 to form a floor slab. 6 is installed and the pile support structure 1 is constructed.

The mode of the reinforcing members 10a to 10d is not limited to the above-described embodiment. For example, three or more fitting portions 8, 8 ... Are arranged in series, and the fitting portions are connected by the reinforcing connecting member 9. It may be a thing or the like.

Further, in the above-described embodiment, the steel pipe pile has been described as an example of the pile, but the pile supporting the superstructure is not limited to the steel pipe pile.

Further, in the above-described embodiment, an example in which the precast concrete member 4 is supported across the adjacent steel pipe piles 3 and 3 has been described, but the precast concrete member may be shaped to be supported for each steel pipe pile. The shape may be supported by a plurality of steel pipe piles of three or more.

1 Pile support structure 2 Underwater ground 3 Steel pipe pile 4 Precast concrete member 5 Beam part 6 Deck part 7 Superstructure 8 Fitting part 9 Reinforcing connecting material 10 Reinforcing member 11 Cast-in-place concrete part 12 Precast concrete block 13 Sheath pipe 14 Stop member 15 Engagement convex body

Claims (2)

After placing a plurality of piles at intervals in the normal direction and the direction perpendicular to the normal line of the pile support structure to be constructed, a precast concrete member is joined to the pile head, and the precast concrete member supported by the pile is joined. In the method of constructing a pile support structure in which a cast-in-place concrete portion is formed between the piles and the precast concrete members supported by the piles are connected to each other.
A reinforcing member including a plurality of fitting portions to be fitted to the pile and a connecting reinforcing member having a fixed length for connecting the fitting portions is used.
Between adjacent piles at the place concrete subordinates to form connected by the reinforcing member after, after reinforced by supporting a pile fit Ri該隣together with bonding the said precast concrete member in the pile, the precast concrete part A method for constructing a pile support structure, which comprises placing cast-in-place concrete between them to form the cast-in-place concrete portion. The reinforcing member is a linear type in which the fitting portions are arranged in series, a triangular type in which the fitting portions are arranged in three corners, and a rectangular type or a U-shape in which the fitting portions are arranged at the four corners of the cast-in-place concrete. The method for constructing a pile support structure according to claim 1, wherein the pile support structure is appropriately selected and used according to the position.

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