JP2018115514A - Method for constructing pile bearing structure, and reinforcement member used in the pile bearing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a pile bearing structure in which it is possible to install a precast concrete member efficiently and to achieve reinforcement of a structure, and a reinforcement member used in the pile bearing structure.SOLUTION: The method for constructing the pile bearing structure comprises installing piles 3, 3 to space them in a normal direction and a normal right-angle direction, then connecting between the piles adjacent to each other using reinforcement members 10a to 10d, thereafter joining precast concrete members 4, 4 in that condition, and installing cast-in-place concrete 11 between the precast concrete members 4, 4. Thus, it is possible to install the precast concrete members and cast-in-place concrete efficiently, and possible to achieve reinforcement of the structure.SELECTED DRAWING: Figure 1

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 and a reinforcing member used therefor.

  Conventionally, in the construction of a pile support structure such as a pier, after placing a plurality of steel pipe piles, each work such as scaffolding installation, support installation, pile head treatment work, etc. is carried out at sea, and between steel pipe piles. A concrete frame was formed between steel pipe piles using a spanned support, and a concrete superstructure was formed by placing the concrete in place.

  In the construction of this pile support structure, since a series of construction work is performed at sea, if the sea conditions and weather conditions are bad, the steel pipe pile may sway due to waves, etc., which may interfere with each work. The steel pipe piles were connected with temporary steel after the steel pipe piles were placed, and the steel pipe piles were supported together.

  Moreover, when installing a support work between steel pipe piles, it was made to support between steel pipe piles with the above-mentioned temporary steel material or instead of a temporary steel material by a support work.

  In recent years, one or more precast concrete prefabricated members (hereinafter referred to as precast concrete members) that constitute the superstructure (beam part) are manufactured in advance in an on-site factory or production yard and transported to the construction site. Then, 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 construction method is used, and the construction period is shortened and the quality is improved (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, the equipment such as a hoist ship that lifts and transfers each precast concrete member may be a small-scale device. It also has the advantage that it can be constructed even in places where movement of large ships 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 to each other, thereby increasing the horizontal rigidity and the horizontal strength (hereinafter referred to as the strut method). ) Is known (see, for example, Patent Document 2).

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

JP 2001-288725 A JP-A-9-235714

  However, in the PCa block construction method as described above, there is no need to bridge a support work between the steel pipe piles for installing the formwork, and there is an advantage that the cost can be reduced and the work period can be shortened. 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 the steel pipe piles with temporary steel materials. There is a problem that the advantage of the PCa block construction method that can be omitted is not fully utilized.

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

  Then, in view of such a conventional problem, the present invention was made for the purpose of providing a method for constructing a pile support structure that can efficiently install a precast concrete member and can reinforce the structure. Is.

  The feature of the invention according to claim 1 for solving the conventional problems as described above is that after placing a plurality of piles at intervals in the normal direction and normal direction of the pile support structure to be constructed In the method for constructing a pile support structure in which a precast concrete member is joined to the pile head, a plurality of fitting portions to be fitted to the pile, and a connection reinforcing material having a fixed length for connecting the fitting portions, The adjacent piles are connected by the reinforcing member, and the adjacent piles are supported and reinforced, and then the precast concrete member is joined to the pile, and the precast concrete member It is in the construction method of the pile support structure which connects between with the cast-in-place concrete.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the reinforcing member includes a linear type in which fitting parts are arranged in series, a triangular type in which fitting parts are arranged in three corners, and four fitting parts in four corners. One of the rectangular shape and the U-shape arranged in the above is to be appropriately selected and used in accordance with the position of the cast-in-place concrete.

  The feature of the invention described in claim 3 is that after placing a plurality of piles at intervals in the normal direction and normal direction of the pile support structure to be constructed, a precast concrete member is joined to the pile head. A reinforcing member for connecting adjacent piles of a pile support structure constructed by a plurality of fitting portions to be fitted to the piles, and a connecting reinforcing material for connecting the fitting portions; The connection reinforcing material is a normal direction connecting reinforcing material having the same length as the normal direction distance between the piles, a normal direction connecting reinforcing material and / or a diagonal line having the same length as the normal direction perpendicular distance between the piles. It is composed of diagonal connecting reinforcements having the same length as the distance between adjacent piles in the direction, the linear shape in which the fitting portions are arranged in series, the triangular shape in which the fitting portions are arranged in three corners, and the respective fitting portions. The reinforcing member is formed in a rectangular shape or a U-shape disposed at four corners.

  As described above, the method for constructing a pile support structure according to the present invention, after placing a plurality of piles at intervals in the normal direction and normal direction of the pile support structure to be constructed, In a method for constructing a pile support structure in which a precast concrete member is joined to a portion, reinforcement comprising a plurality of fitting portions to be fitted to the pile, and a connection reinforcing material having a fixed length for connecting the fitting portions. After connecting the adjacent piles with the reinforcing member and reinforcing the adjacent piles to each other, the precast concrete member is joined to the pile and the precast concrete member is cast in place between the precast concrete members. By connecting with concrete, it is possible to easily position the pile without using a support material or a steel material for temporary fixing, and it is possible to improve the rigidity of the entire pile support structure.

  In the present invention, the reinforcing member is any one of a linear type in which fitting parts are arranged in series, a triangular type in which fitting parts are arranged in three corners, a rectangular type in which fitting parts are arranged in four corners, or a U-shaped type. Can be appropriately selected and used in accordance with the position of the cast-in-place concrete, so that various precast concrete members can be easily arranged by combining a plurality of patterned reinforcing members.

  The reinforcing member according to the present invention is constructed by placing a plurality of piles at intervals in the normal direction and normal direction of the pile support structure to be constructed, and then joining a precast concrete member to the pile head In the reinforcing member that connects adjacent piles of the pile support structure to be provided, the reinforcing member includes a plurality of fitting portions that are fitted to the piles, and a connection reinforcing material that connects the fitting portions. Is connected to the normal direction connecting reinforcement of the same length as the normal direction distance between the piles, the normal direction connecting reinforcing material of the same length as the normal direction distance between the piles and / or adjacent to the diagonal direction. Consists of diagonal connecting reinforcements with the same length as the distance between the mating piles, linear type with the fitting parts arranged in series, triangular type with the fitting parts arranged in three corners, and each fitting part arranged in four corners The distance between the piles of the pile support structure is reduced by being formed into a rectangular shape or a U shape. It is possible to maintain a constant distance, can be coupled between piles to support each other.

(a) is a side view which shows an example of the pile support structure constructed | assembled by the construction method of the pile support structure which concerns on this invention, (b) is the same AA arrow directional view. It is a top view which shows the reinforcement member in FIG. 1, Comprising: (a) is a linear type, (b) Triangular type, (c) is a rectangular type, (d) is U shape. The top view which shows the attachment state of a reinforcement member, (b) is the longitudinal cross-sectional view. (a) is a side view which shows the state of the initial stage of the reinforcement member attachment operation | work in the construction method of the pile support structure which concerns on this invention, (b) is the same top view. (a) is a side view which shows the state of the latter stage of a reinforcement member attachment operation | work same as the above, (b) is the top view. (a) is a side view which shows the state of the attachment operation | work of the precast concrete member same as the above, (b) is the same top view.

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

  Fig.1 (a) is a side view of the pile support structure 1 constructed | assembled by this invention, FIG.1 (b) is the same AA arrow directional view. The right side in FIG. 1 (a) is the land side, the left side is the offshore side, and the normal direction and normal direction perpendicular to the pile support structure 1 constructing the directions shown in FIG. This is referred to as “straight 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. , And cast-in-place concrete 11 connecting the pre-cast concrete members 4, 4. The precast concrete members 4, 4. A floor slab portion 6 is formed on the beam portion 5, and the beam portion 5 and the floor slab portion 6 constitute an upper work 7.

  Moreover, in this pile support structure 1, it provided with the some fitting part 8,8 ... which fits with the steel pipe pile 3, and the connection reinforcement material 9 of the fixed length which connects between the fitting parts 8 and 8. FIG. After using the reinforcing members 10a to 10d and placing the steel pipe piles 3, 3... On the water bottom ground 2, 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. Has been.

  Each of the precast concrete members 4, 4... Has the sheath pipes 13, 13 inside the hole whose bottom surface is opened, and the support member disposed in the sheath pipes 13, 13 is supported by the pile head of the steel pipe pile 3. By inserting a filler such as grout between the sheath pipes 13 and 13 and the pile head temporarily supported and fitted together, the pile head is joined.

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

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

  The sheath tubes 13 and 13 are formed in a cylindrical 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 a length that is longer than the height (vertical thickness) of the precast concrete member 4 and whose lower side protrudes from the lower surface of the precast concrete member 4. Instead, the precast concrete member 4 may be formed to have a height (up-down direction thickness) or shorter.

  Although not particularly shown, the support member is made of, for example, H-shaped steel, and is disposed so as to cross the inside of the sheath tubes 13 and 13 in a diametrical direction at a predetermined height position from the lower ends of the sheath tubes 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,.

  As shown in FIG. 2, the reinforcing members 10 a to 10 d are a linear type 10 a in which fitting parts 8, 8 are arranged in series, a triangular type 10 b in which fitting parts 8, 8... Are arranged in three corners, and fitting parts 8, 8. .. Are arranged at four corners, and any one of them is appropriately selected and used. In addition, in FIG.1 (b) and FIG. 2, hatching is attached | subjected for convenience so that each reinforcement member 10a-10d may be identified easily.

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

  Further, the engaging portion 8 has locking members 14, 14... Projecting from the inner peripheral portion thereof, and the steel pipe piles 3, 3. In addition, by filling a 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.

  The locking members 14, 14... May be a shear key or the like in which a steel bar is welded in the circumferential direction in addition to the stud shape shown in FIG.

  The length of the connecting reinforcing material 9 is set in accordance with the distance between the steel pipe piles 3 and 3 to be attached, and the connecting reinforcing material 9a for the normal direction has the same length as the normal direction perpendicular distance between the piles 3 and 3. The normal reinforcing link 9b has the same length as the normal distance between the piles 3 and 3, and the diagonal connecting reinforcing material 9c has the same length as the distance between the adjacent piles in the diagonal direction.

  The length of each connection reinforcement 9a-9c is not limited to what is shown in a present Example, It can set freely, for example, the normal direction connection reinforcement 9a and the normal direction connection reinforcement 9b May be the same length, or the normal direction connecting reinforcing material 9a may be longer than the normal direction connecting reinforcing material 9b.

  And each reinforcement member 10a-10d is the fitting part 8,8 by the combination of arrangement | positioning of each fitting member 8,8 ... and the connection reinforcement material 9a-9c which connects between each fitting member 8,8. Are arranged in series, a triangular shape 10b in which the fitting portions 8 and 8 are arranged at three corners, and a rectangular shape 10c or a U-shape 10d in which the fitting portions 3, 3. .

  In addition, each reinforcement member 10a-10d is attached to the lower side of the sheath pipe | tube 13 in two steps | paragraph arrangement | positioning according to arrangement | positioning of the precast concrete members 4 and 4. FIG.

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

  First, as a preliminary preparation, the configuration of the precast concrete members 4, 4... Constituting the beam portion 5 is determined based on the topography of the construction site and the scale of a crane device such as a hoist ship that can be used. Each of the precast concrete members 4, 4.

  On the other hand, considering the arrangement of the precast concrete members 4, 4... And the placement of the cast-in-place concrete portions 11, 11..., The reinforcing members that connect the steel pipe piles 3, 3. The mold 10c or the U-shaped mold 10d is appropriately selected, and the necessary reinforcing members 10a to 10d are manufactured in advance in a factory or the like.

  The reinforcement members 10a to 10d are selected by confirming 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. , 11... The connecting reinforcing members 9a to 9c of the reinforcing members 10a to 10d are always located below, and the reinforcing members 10a to 10d are combined so that they can be reinforced most rationally.

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

  As described above, the placement of the respective cast-in-place concrete portions 11, 11... And the shapes of the reinforcing members 10a to 10d are overlapped, and the overlapping of the adjacent reinforcing members 10a to 10d is comprehensively taken into consideration. Determine placement.

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

  At that time, each of the steel pipe piles 3, 3... Placed is standing independently and is in a state where waves and other external forces are applied.

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

  The reinforcing members 10a to 10d were reinforced by attaching the reinforcing members 10a to 10d so as to straddle between the steel pipe piles 3 and 3 serving as a reference, and reinforcing the steel pipe piles 3 and 3 to support each other. The positions of the steel pipe piles 3, 3, ... that are adjacent to each other in the normal direction and the direction perpendicular to the normal line are adjusted in accordance with the positions of the steel pipe piles 3, 3, ....

  The position adjustment of the steel pipe piles 3, 3,... Is performed, for example, by supporting one end of the chain block on the already reinforced steel pipe piles 3, 3 ..., and the pile heads of the other steel pipe piles 3, 3 ... via the chain block. Align by pulling.

  And the reinforcing members 10a-10d are attached so that the pile heads of the adjacent steel pipe piles 3 and 3 may be connected in that state.

  And each reinforcement member 10a-10d is attached like the arrangement | positioning shown in FIG. 5 by repeating the position adjustment on the basis of the reinforced steel pipe pile 3, and the connection operation | work of reinforcement member 10a-10d.

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

  And the fillers 16, such as mortar, are filled in each fitting part 8 of each reinforcement member 10a-10d, and each reinforcement member 10a-10d is fixed to the steel pipe pile 8. FIG.

  Next, each precast concrete member 4,4 ... is transferred to a construction site by a crane ship or the like, and the precast concrete members 4,4 ... are lifted by a crane, and the positions of the sheath tubes 13, 13 are corresponded as shown in FIG. Suspend in a state that fits each steel pipe pile 3, 3.

  At that time, since the reinforcing members 10a to 10d are mounted across the steel pipe piles 3, 3,..., The steel pipe piles 3, 3,. Since it is prevented, it can be easily aligned and the precast concrete members 4, 4... Can be suspended efficiently.

  When the sheath pipes 13, 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 ... are formed into the piles via the support members. Temporarily supported.

  Next, as shown in FIG. 6, with the precast concrete members 4, 4... Temporarily supported on the pile heads, the gap between the sheath pipes 13, 13 and the steel pipe piles 3, 3,. The precast concrete members 4, 4... Are joined to the pile heads of the steel pipe piles 3, 3,.

  Further, if necessary, the filling cast concrete made by 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.

  And after performing the joining operation | work of the precast concrete member 4,4 ... mentioned above for every steel pipe pile 3,3 ..., while installing a rebar etc. between adjacent precast concrete members 4,4, installing a formwork, As shown in FIG. 1, cast-in-place concrete is cast to form cast-in-place concrete portions 11, 11... Connecting the precast concrete members 4, 4.

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

  Then, the cast-in-place concrete is cured and solidified to form a lattice-like beam portion 5 supported by the steel pipe piles 3, 3... And the cast-in-place concrete or precast floor board is installed on the beam portion 5. 6 is installed and the pile support structure 1 is constructed.

  In addition, the aspect of reinforcement member 10a-10d is not limited to the above-mentioned Example, For example, the three or more fitting parts 8,8 ... are arrange | positioned in series, and each fitting part was connected with the reinforcement connection material 9. FIG. The thing etc. may be sufficient.

  Moreover, in the above-mentioned Example, although the steel pipe pile was demonstrated to the example as a pile, the pile which supports a superstructure is not limited to a steel pipe pile.

  Furthermore, although the above-mentioned Example demonstrated the example made into the shape made to support the precast concrete member 4 straddling the adjacent steel pipe piles 3 and 3, a precast concrete member may be a shape made to support for every steel pipe pile. The shape supported by three or more steel pipe piles may be sufficient.

DESCRIPTION OF SYMBOLS 1 Pile support structure 2 Submerged ground 3 Steel pipe pile 4 Precast concrete member 5 Beam part 6 Floor slab part 7 Upper work 8 Fitting part 9 Reinforcement connecting material 10 Reinforcement member 11 Cast-in-place concrete part 12 Precast concrete block 13 Sheath pipe 14 Engagement Stop member 15 engaging convex body

Claims (3)

In the construction method of a pile support structure in which a precast concrete member is joined to the pile head after driving a plurality of piles at intervals in the normal direction and normal direction of the pile support structure to be constructed,
Using a reinforcing member provided with a plurality of fitting portions that fit with the piles, and a connection reinforcing material of a certain length that connects between the fitting portions,
The adjacent piles are connected with the reinforcing members, and the adjacent piles are supported and reinforced, and then the precast concrete members are joined to the piles and the precast concrete members are connected with the cast-in-place concrete. The construction method of the pile support structure characterized by this.   The reinforcing member is a linear type in which fitting parts are arranged in series, a triangular type in which fitting parts are arranged in three corners, a rectangular type in which fitting parts are arranged in four corners, or a U-shaped type. The method for constructing a pile support structure according to claim 1, wherein the pile support structure is appropriately selected and used according to a position. Next to a pile support structure constructed by placing a plurality of piles at intervals in the normal direction and normal direction of the pile support structure to be constructed, and then joining a precast concrete member to the pile head In the reinforcing member that connects the matching piles,
A plurality of fitting portions to be fitted to the pile, and a connection reinforcing material for connecting the fitting portions;
The connection reinforcing material includes a normal direction connection reinforcing material having the same length as the normal direction distance between the piles, a normal direction connecting reinforcing material having the same length as the normal direction perpendicular distance between the piles, and / or It is composed of a diagonal connecting reinforcement material having the same length as the distance between piles adjacent to each other in the diagonal direction, a linear type in which the fitting parts are arranged in series, a triangular type in which the fitting parts are arranged in three corners, and the respective fitting parts The reinforcing member is formed in a rectangular shape or a U-shape disposed at four corners.

Images