JP7307670B2 - Pile column head joint structure and joint method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a head joint structure and a joining method for a pile columnar body for joining a superstructure such as a pier or a concrete structure such as a footing to a pile columnar body such as a steel pipe pile.

Conventionally, when joining a concrete structure such as a footing and a pile column such as a steel pipe pile, the head of the pile column is embedded in the concrete structure for a certain length, and the embedded portion resists the pile head bending moment. method (hereinafter referred to as method A), the depth of embedment of the pile head in the concrete structure is minimized, and vertical reinforcing bars are placed across the pile head and the concrete structure in the circumferential direction of the pile head. and a method of resisting the pile head bending moment by means of reinforcing bars (hereinafter referred to as method B) is known (see, for example, Patent Document 1).

In method A, since the main reinforcing bars placed under the concrete structure such as the footing are structurally separated, it is necessary to arrange sufficient reinforcing reinforcing bars, which complicates the arrangement.

On the other hand, Method B generally has a lower rigidity than Method A, but has the advantage of simplifying the arrangement because the main reinforcing bars placed under the concrete structure such as the footing are not separated by the pile columns. There is

In addition, Method B has few examples of application to pile head joints and precast members in pile support structures such as piers, and is expected to be applied to this field.

Japanese Unexamined Patent Application Publication No. 2006-83609

However, in the technique related to conventional method B, vertical reinforcing bars are arranged at intervals in the circumferential direction of the pile head. There is a risk of interference with the placed main reinforcement, and in order to avoid this, it was necessary to provide a member that supports the reinforcing reinforcement on the outer peripheral surface of the pile head of the pile column.

In addition, when the concrete structure to be joined to the pile column is a precast member, it is difficult to fit the main reinforcing bars and reinforcing bars of the concrete structure together. In many cases, it was installed, the pile head was inserted into the sheath pipe, and the pile column was joined by pouring concrete into the sheath pipe.

However, since the main reinforcement of the concrete structure is divided by the sheath pipe, the number of reinforcement reinforcements required to ensure strength increases, and the outer diameter of the pile column must be increased accordingly. there were.

Therefore, in view of such conventional problems, the present invention is capable of avoiding interference between the main reinforcing bars and reinforcing reinforcing bars of concrete structures such as footings and superstructures of piers, and resisting the pile head bending moment. The purpose of the present invention is to provide a pile head joining structure and a joining method for a pile column-shaped body.

The feature of the invention described in claim 1 for solving the above-described conventional problems is a head joint structure of a pile column, in which a concrete structure is joined to the head of a pile column, wherein the concrete structure A reinforcing bar connection plate is provided at the lower part of the body and supported by the head of the pile column, wherein horizontal reinforcing bars embedded in the concrete structure are fixed to the reinforcing bar connection plate, and the concrete structure It is provided with a through hole for a reinforcing reinforcing bar through which a reinforcing reinforcing bar arranged across the body and the pile column-shaped body is passed.

In addition to the configuration of claim 1, the feature of the invention according to claim 2 is that the pile columnar body has a height adjustment member at the pile head, and the reinforcing bar connection plate is connected to the height adjustment member through the height adjustment member. It is supported by the head of the pile column.

In addition to the configuration of claim 1 or 2, the feature of the invention according to claim 3 is that the concrete structure is a precast concrete member, and the reinforcing bar connecting plate is a vertical hole formed in the precast concrete member. located at the bottom of the

The feature of the invention according to claim 4 is that, in addition to the configuration according to any one of claims 1 to 3, a reinforcing bar support plate is provided above the reinforcing bar connection plate with a space therebetween, and the reinforcing bar support plate is attached to the concrete structure. The horizontal reinforcing bars embedded in the body are fixed and the reinforcing bars are fixed.

A feature of the invention according to claim 5 is that, in addition to the configuration of claim 4, the reinforcing bar support plate is provided with a reinforcing bar through hole through which the reinforcing bar is passed.

The feature of the invention according to claim 6 is that, in addition to the configuration of claim 4, the reinforcing bar support plate is formed with a reinforcing bar group insertion opening through which a reinforcing bar group composed of a plurality of reinforcing reinforcing bars is inserted, A fixing plate having an outer edge supported by the edge of the opening for inserting the reinforcing bar group is provided, the fixing plate supports the upper ends of the plurality of reinforcing bars, and the plurality of reinforcing bars are connected to the fixing plate through the fixing plate. The reinforcing reinforcing bar supported by the reinforcing bar supporting plate and supported by the fixing plate is penetrated through the reinforcing reinforcing bar through hole formed in the reinforcing bar connection plate.

The feature of the invention according to claim 7 is that, in addition to the configuration of claim 6, the outer side of the reinforcing reinforcing bar group consisting of a plurality of reinforcing reinforcing bars whose upper ends are supported by the fixing plate is constrained by an annular or spiral hoop bar. It is in what is being done.

The feature of the invention according to claim 8 is that, in addition to the configuration according to any one of claims 4 to 6, a plurality of hoop-bar supporting columns are provided between the reinforcing-bar connection plate and the reinforcing-bar support plate, and the hoop-bars A ring-shaped or spiral hoop muscle is supported by the support column.

According to the ninth aspect of the invention, in addition to the configuration of the eighth aspect, a form member for forming a vertical hole is provided outside the plurality of hoop-bar supporting columns.

The feature of the invention according to claim 10 is that, in addition to the configuration according to any one of claims 1 to 9, a guide hole that is detachably protruding from the head of the pile columnar body and opened to the reinforcing bar connection plate is provided. A guide member to be inserted is provided, and the through holes for reinforcing reinforcing bars are arranged at intervals in the circumferential direction outside the guide holes.

The feature of the invention according to claim 11 is, in addition to the configuration of any one of claims 1 to 10, an annular cushioning member supported by the upper end of the pile columnar body and arranged under the reinforcing bar connection plate. and the pile pillar-shaped body and the concrete structure are joined to each other through a constricted portion made of concrete formed inside the cushioning member.

The feature of the invention according to claim 12 is a method for joining the head of a pile column to join a concrete structure to the head of a pile column. The reinforcing bar connecting plate is supported by the head of the pile columnar body, and in this state, the reinforcing bar is inserted through the through-hole for the reinforcing bar formed in the reinforcing bar connecting plate. The concrete structure is joined to the head of the pile columnar body by disposing it across the upper and lower sides of the reinforcing bar connecting plate and then pouring concrete.

The feature of the invention according to claim 13 is characterized in that, in addition to the configuration of claim 12, the concrete structure is a precast concrete member, and the reinforcing-bar connection plate is positioned below a vertical hole formed in the precast concrete member. The precast concrete member is supported by the head of the pile column-shaped body via the reinforcing bar connection plate, and in this state, the precast reinforcing bar is passed through the reinforcing bar through hole formed in the reinforcing bar connecting plate. The precast concrete member is joined to the head portion of the pile column by disposing it across the concrete member and the pile column, and then pouring concrete into the vertical hole.

The feature of the invention according to claim 14 is that, in addition to the configuration of claim 12 or 13, a height adjustment member whose height is adjusted is fixed to the head of the pile column-shaped body, and the height adjustment member is mounted on the height adjustment member. To support a reinforcing bar connection plate.

The feature of the invention according to claim 15 is characterized in that, in addition to the configuration of claim 14, the height adjustment member has a supporting convex portion for supporting the reinforcing bar connection plate in the central portion, and the outer side of the supporting convex portion The reinforcing bar connecting plate is supported by the supporting protrusion with an annular cushioning member fitted in the support, and then the concrete is cast to join the pile column and the concrete structure. and forming a constricted portion smaller in diameter than the pile column inside the cushioning member, and joining the pile column and the concrete structure through the constricted portion.

The feature of the invention according to claim 16 is that, in addition to the configuration according to any one of claims 12 to 15, a guide member protruding from the head of the pile columnar body has a guide hole opening to the reinforcing bar connection plate. The reinforcing bar connecting plate is guided by the guide member to guide the concrete structure to the installation position, the pile columnar body supports the reinforcing bar connecting plate, and is circumferentially spaced outside the guide hole To insert a reinforcing reinforcing bar into a through hole for reinforcing reinforcing bar arranged with a gap.

The feature of the invention according to claim 17 is that, in addition to the configuration according to any one of claims 12 to 16, a reinforcing bar support plate is provided above the reinforcing bar connecting plate with a space therebetween, and the reinforcing bar supporting plate is provided with the An object of the present invention is to fix a horizontal reinforcing bar embedded in a concrete structure and to fix the reinforcing reinforcing bar.

In addition to the configuration of claim 17, the feature of the invention according to claim 18 is that the upper ends of a plurality of reinforcing reinforcing bars are supported by a fixing plate, and the head of the pile columnar body is connected to the reinforcing bar through the reinforcing bar connection plate. After supporting the concrete structure made of precast concrete members , a plurality of reinforcing reinforcing bars supported by the fixing plate are inserted through openings formed in the reinforcing bar support plate for inserting the reinforcing bar group, and the reinforcing bar connecting plate. , the outer edge of the fixing plate is supported by the edge of the opening for inserting the reinforcing bar group, and the upper end of each reinforcing bar is supported by the fixing plate through the reinforcing bar through hole. It is to be supported by the plate.

In addition to the configuration of claim 18, the feature of the invention according to claim 19 is that the outer side of a reinforcing bar group consisting of a plurality of reinforcing bars whose upper ends are supported by the fixing plate is restrained by a circular or spiral hoop. There is something to keep in mind.

The feature of the invention according to claim 20 is characterized in that, in addition to the configuration of claim 17 or 18, a plurality of hoop-bar supporting columns are provided between the reinforcing-bar connecting plate and the reinforcing-bar supporting plate, and the hoop-bar supporting columns to support a circular or spiral hoop muscle in

The pile head joint structure of the pile column according to the present invention is a structure that resists a bending moment by reinforcing reinforcing bars by providing the configuration described in claim 1. and the interference with reinforcing bars can be avoided.

Moreover, in the present invention, by providing the configuration described in claim 2, the joint height can be easily adjusted.

Furthermore, in the present invention, by providing the configuration according to claim 3, the structure that resists the bending moment by reinforcing reinforcing bars can also be suitably applied to precast concrete members.

Furthermore, in the present invention, by providing the configuration according to claim 4, it is possible to avoid interference between the reinforcing reinforcing bars and the horizontal reinforcing bars arranged on the upper part of the concrete structure, and to fix the reinforcing reinforcing bars. can be easily done.

In addition, in the present invention, by providing the configuration described in claim 5, the head portion of the reinforcing reinforcing bar can be fixed to the reinforcing bar support plate in accordance with the position of the reinforcing reinforcing bar through hole of the reinforcing bar connection plate.

Moreover, in this invention, by comprising the structure of Claim 6, a reinforcing bar can be installed collectively.

Furthermore, in the present invention, by providing the configuration according to claim 7, it is possible to position a plurality of reinforcing reinforcing bars, and to collectively install the hoop bars together with the reinforcing reinforcing bars.

In addition, in the present invention, by providing the configuration described in claim 8, it is possible to omit the installation work of the hoop reinforcement on site, reduce the work in a narrow place, and perform the work efficiently. can be done.

Furthermore, in the present invention, by providing the configuration according to claim 9, the vertical hole can be formed in a state in which the hoop reinforcement and the concrete structure are separated.

Furthermore, in the present invention, by providing the configuration according to claim 10, the pile column and the concrete structure can be easily positioned via the reinforcing bar connection plate, and each reinforcing reinforcing bar can be attached to the pile column. can be placed in a concentric arrangement.

Furthermore, in the present invention, by providing the configuration according to claim 11, it is possible to reduce the bending moment acting on the pile head due to an earthquake or the like, and to rationally design the pile column and the concrete structure. It can be carried out.

The method for joining the pile head of a pile column according to the present invention is provided with the configuration described in claim 12, whereby the reinforcing reinforcing bar interferes with the main reinforcing bar (horizontal reinforcing bar) arranged in the lower part of the concrete structure. It can be installed efficiently without

Moreover, in the present invention, by providing the configuration according to claim 13, a concrete structure can be constructed efficiently.

Furthermore, in the present invention, by providing the configuration according to claim 14, the pile head height of each pile can be easily adjusted.

In addition, in the present invention, by providing the configuration according to claim 15, the concrete structure and the pile column are semi-rigidly joined, the bending moment generated at the pile head due to an earthquake or the like is reduced, and the pile column is reduced. , the concrete structure can be rationally designed, so that the pile head can be constructed efficiently.
Stress can be reduced, and damage to the pile column can be prevented.

Furthermore, in the present invention, by providing the configuration according to claim 16, the concrete structure can be guided to a predetermined position via the reinforcing bar connection plate, and each reinforcing bar for the pile column can be guided. can be placed in a concentric arrangement.

Furthermore, in the present invention, by providing the configuration described in claim 17, it is possible to avoid interference between the horizontal reinforcing bars and the reinforcing reinforcing bars arranged in the upper part of the concrete structure, and to efficiently arrange the reinforcing reinforcing bars. , Reinforcing bars can be easily anchored.

Moreover, in the present invention, by providing the configuration according to claim 18, the reinforcing reinforcing bars can be installed collectively.

Furthermore, in the present invention, by providing the configuration according to claim 19, it is possible to position a plurality of reinforcing reinforcing bars, and to collectively install the hoop bars together with the reinforcing reinforcing bars.

In addition, in the present invention, by providing the configuration described in claim 20, it is possible to omit the installation work of the hoop reinforcement on site, reduce the work in a narrow space, and perform the work efficiently. can be done.

It is a front view which shows an example which uses the head joint structure of the pile column-shaped object which concerns on this invention. It is a longitudinal cross-sectional view which shows the joining state of the pile head of the pile column-shaped body in FIG. FIG. 3 is a perspective view showing a reinforcing bar connection plate in FIG. 2; It is a figure which shows the procedure of the pile head joint method of the pile pillar-shaped body based on this invention, (a) is a top view which shows the state of the assembly work of a pile pillar-shaped body, (b) is the same longitudinal cross-sectional view. (a) is a plan view showing the state of the same precast concrete member, and (b) is a vertical sectional view of the same. It is a bottom view same as the above. Fig. 10 is a perspective view showing a state of work for installing a concrete structure on the same pile columnar body; (a) is a top view which shows the state which installed the concrete structure in the pile column-shaped body same as the above, (b) is the longitudinal cross-sectional view. (a) is a top view which shows the state of the installation work of a reinforcing bar same as the above, (b) is the same longitudinal cross-sectional view. (a) is a plan view showing a state of placing concrete in the pile head same as the above, and (b) is a vertical cross-sectional view of the same. It is a figure which shows another example of the head joint structure of the pile column-shaped body which concerns on this invention, Comprising: (a) is a top view of the state before concrete placing, (b) is the same longitudinal cross-sectional view. It is a figure which shows another example of the head joint structure of the pile column-shaped body which concerns on this invention, Comprising: (a) is a top view which shows a concrete structure, (b) is the same longitudinal cross-sectional view. FIG. 13 is a perspective view showing a structure for supporting the hoop muscles in FIG. 12; (a) is a plan view of a state before placing concrete using the same concrete structure, and (b) is a longitudinal sectional view of the same. (a) is a plan view showing a state of placing concrete in the pile head same as the above, and (b) is a vertical cross-sectional view of the same. FIG. 4 is an exploded perspective view showing another example of a structure for supporting reinforcing bars; FIG. 4 is a cross-sectional view showing a state of work for installing reinforcing bars when using the same structure. (a) is a top view which shows the state which installed the reinforcing bar same as the above, (b) is the same sectional drawing. (a) is a plan view showing a state of placing concrete in the pile head same as the above, and (b) is a vertical cross-sectional view of the same. It is a longitudinal cross-sectional view which shows another example of the head joint structure of the pile column-shaped body which concerns on this invention. It is a figure which shows the procedure of the pile head joining method of a pile pillar-shaped body same as the above, Comprising: (a) is a top view which shows the state of the assembly work of a pile pillar-shaped body, (b) is the same longitudinal cross-sectional view. (a) is a top view which shows the state which installed the concrete structure in the pile column-shaped body same as the above, (b) is the longitudinal cross-sectional view. (a) is a top view which shows the state of the installation work of a reinforcing bar same as the above, (b) is the same longitudinal cross-sectional view. (a) is a plan view showing a state of placing concrete in the pile head same as the above, and (b) is a vertical cross-sectional view of the same. It is a longitudinal cross-sectional view which shows another example of the head joint structure of the pile pillar-shaped body which concerns on this invention. It is a figure which shows the procedure of the head joining method of a pile pillar-shaped body same as the above, Comprising: It is a longitudinal cross-sectional view which shows the state which drove the pile pillar-shaped body. (a) is a top view which shows the state which installed the reinforcing-bar connection plate same as the above, (b) is the same longitudinal cross-sectional view. (a) is a top view which shows the state of the arrangement|positioning work of a reinforcing bar same as the above, (b) is the same longitudinal cross-sectional view. (a) is a top view which shows the state of arrangement|positioning work of a horizontal reinforcement same as the above, (b) is the same longitudinal cross-sectional view.

Next, embodiments of the pile head joint structure according to the present invention will be described based on the examples shown in FIGS. 1 to 10. FIG.

In this embodiment, a pile support structure such as a pier will be described as an example, and reference numeral 1 in the figure is the pile support structure.

As shown in FIG. 1, the pile support structure 1 includes a pile column 3 such as a plurality of steel pipe piles driven into the submerged ground 2, and a reinforced concrete beam 4 supported by the pile column 3. A floor slab portion 5 is formed on the beam portion 4, and the beam portion 4 and the floor slab portion 5 form the superstructure of the pier.

In addition, as shown in FIG. 2, this pile support structure 1 has vertical reinforcing bars 8, 8, . . . are spaced apart in the circumferential direction of the pile head, and concrete 9 is poured into the vertical hole 7 and the pile head, thereby joining the pile column 3 and the concrete structure 6 .

The pile columnar body 3 is a steel pipe pile, a PHC pile, a cast-in-place concrete pile, or the like (a steel pipe pile in this embodiment), and is formed in a vertical hollow cylindrical shape.

The pile column 3 is provided with a bottom formwork 10 for placing concrete at a predetermined depth from the upper end.

In addition, the pile columnar body 3 is provided with a height adjusting member 11 at the top of the pile, and a reinforcing bar connection plate 12, which will be described later, is supported via the height adjusting member 11. As shown in FIG.

As shown in FIG. 4, the height adjusting member 11 is formed in a shape in which strip-shaped steel plates 11a, 11a with their short sides facing up and down are crossed, in this embodiment, in a cross shape. It is inserted into the pile head and fixed to the upper end of the pile column 3 by welding or the like. The form of the height adjustment member 11 is not limited to this embodiment, and any shape that allows height adjustment may be used.

Triangular mounting plates 11b, 11b, . A guide member 13 is detachably attached.

The beam portion 4 is composed of a concrete structure 6 made of a precast concrete member joined to the pile column 3, and the concrete structure 6 is formed with a vertical hole 7 joined to the pile column 3.

In the lower part of the vertical hole 7, a reinforcing bar connection plate 12 is arranged under the concrete structure 6 and supported by the head of the pile column 3. The ends of the horizontal reinforcing bars 14, 14, . . . embedded in the portion are fixed by welding or the like.

As shown in FIG. 3, the reinforcing bar connection plate 12 is made of a steel plate or the like. are formed at intervals.

The through-holes 12b, 12b for reinforcing reinforcing bars are positioned corresponding to the arrangement of the reinforcing reinforcing bars 8 determined based on the pile diameter of the pile columnar body 3, and are positioned from the center of the reinforcing bar connection plate 12 to the pile columnar body 3. are formed at positions closer than the inner radius of the pile head at intervals in the circumferential direction of the pile head.

Each of the through-holes 12b, 12b for reinforcing bars has a diameter through which the bar-shaped reinforcing bars 8, 8... can pass through, and the reinforcing bars 8, 8... penetrate through the through-holes 12b, 12b... for reinforcing bars, It is fixed to the reinforcing bar connection plate 12 in an arrangement straddling the inside of the vertical hole 7 and the inside of the pile columnar body 3 .

The guide hole 12a is formed so as not to interfere with the through-holes 12b, 12b for reinforcing reinforcing bars, and is fitted to the guide member 13, so that the reinforcing bar connection plate 12 is guided by the guide member 13, and the concrete structure 6 is installed. It is designed to be guided to a position.

As shown in FIG. 4, the guide member 13 includes a rectangular flange portion 13a and guide plates 13b and 13b made of steel plates fixed to the upper surface of the flange portion 13a. 13b are arranged in a cross shape.

Each of the guide plates 13b, 13b has a width that is substantially the same as or slightly narrower than the inner diameter of the guide hole 12a, and the upper portion thereof is tapered toward the tip.

Bolt insertion holes are formed in the flange portion 13a so that the guide member 13 can be detachably fixed to the mounting plates 11b, 11b, . there is

Next, a method for joining the pile head portion of the pile column will be described.

As a preliminary preparation, a concrete structure 6 made of precast concrete members shown in FIGS. 5 and 6 is manufactured in a factory or a manufacturing yard near the construction site.

Although not shown, the concrete structure 6 is manufactured by placing a reinforcing bar connection plate 12 at the bottom of the formwork and placing horizontal reinforcing bars 14, 14, . . . and horizontal reinforcing bars 17, 17, . , and the ends of the lower horizontal reinforcing bars 14, 14 . . . are fixed to the connecting plate 12 by welding or the like.

Concrete is poured into the formwork to form a concrete structure 6 made of precast concrete members with a reinforcement connecting plate 12 arranged at the bottom of the vertical hole 7 .

On the other hand, at the construction site, first, as shown in FIG. set up.

Next, the installation height of the pile column-shaped body 3 is measured, the height adjustment member 11 is fixed while adjusting the height according to the height, and the mounting plate 11b fixed on the height adjustment member 11 The guide member 13 is fixed.

A bottom formwork member 15 is fixed to the outer peripheral surface of the pile column 3 to block the lower side of the vertical hole 7 of the concrete structure 6 .

Next, as shown in FIG. 7, the concrete structure 6 is moved above the pile column 3, the guide member 13 is fitted into the guide hole 12a, and the reinforcing bar connection plate 12 is guided by the guide member 13 to form the concrete structure. The body 6 is guided to the installation position, the reinforcement connection plate 12 is supported by the pile column 3, and the concrete structure 6 is temporarily supported by the pile column 3.

At this time, by guiding the reinforcement connection plate 12 through the guide member 13 through the guide hole 12a, the positions of the pile columnar body 3 and the concrete structure 6 can be easily aligned.

Further, by supporting the concrete structure 6 on the pile column 3 , the lower opening of the vertical hole 7 is closed by the bottom formwork member 15 .

After the concrete structure 6 is temporarily supported by the pile column 3 and stabilized, the guide member 13 and the mounting plates 11b, 11b, . . . are removed. The mounting plates 11b, 11b do not need to be removed if they do not interfere with concrete placement.

Next, as shown in FIG. 9, vertical reinforcing bars 8, 8, . . . Along with fixing, hoop bars 16, 16... are arranged with a vertical interval on the outer side of the reinforcing bars 8, 8... and fixed with binding wires.

At that time, since the pile pillar-shaped body 3 and the reinforcing bar connection plate 12 are precisely aligned by the guide member 13, the reinforcing reinforcing bars 8, 8 to be penetrated through the reinforcing reinforcing bar through holes 12b, 12b, . . . The positions of … are automatically positioned and can be easily installed.

Concrete 9 is poured into the gap between the reinforcing bar connection plate 12 and the bottom form member 15 and into the pile column 3 through the guide hole 12a from the upper surface of the vertical hole 7 (primary placement).

After that, after confirming the filling state of the concrete that has been primarily poured, and connecting the relay reinforcing bars 18 between the horizontal reinforcing bars 17 arranged on the upper part of the concrete structure 6 by a mechanical joint or the like, as shown in FIG. A concrete structure 6 made of precast concrete members is joined to the upper end portion of the pile columnar body 3 by pouring the cast-in-place concrete 9 into the vertical hole 7 (secondary casting) and curing and solidifying it.

Incidentally, the primary placement and the secondary placement may be performed continuously as long as the state of filling of the concrete by the primary placement can be confirmed.

In the head joint structure and joint method of the pile pillar-shaped body 3 configured in this way, since the horizontal reinforcing bars 14, 14 . . . , horizontal reinforcing bars 14, 14, .

Further, when the concrete structure 6 is supported by the pile column 3, the guide member 13 guides the guide hole 12a formed in the reinforcement connecting plate 12, thereby positioning the concrete structure 6 with respect to the pile column 3. This can be easily performed, and positioning of the reinforcing bars 8, 8 can be automatically performed.

As shown in FIG. 11, the concrete structure 6 made of precast concrete members is provided with a reinforcing bar support plate 20 spaced above the reinforcing bar connecting plate 12, and the reinforcing bars 8, 8, . . . The head may be fixed. It should be noted that the same reference numerals are assigned to the same configurations as in the above-described embodiment, and the description thereof will be omitted.

The reinforcing bar support plate 20 is formed in the same manner as the reinforcing bar connection plate 12 shown in FIG. Through holes 20b, 20b, . . . are formed at intervals in the circumferential direction.

Each of the reinforcing bars 8 has a threaded portion at its upper end and is suspended through the reinforcing bar through-holes 12b of the reinforcing bar support plate 20 so as to extend through the reinforcing bar through-holes 20b of the reinforcing bar connecting plate 12. It is fixed to the reinforcing bar support plate 20 by tightening the nut 21 to the threaded portion of the upper end portion in a state of being penetrated.

Also, the end portions of the horizontal reinforcing bars 17, 17 . are concatenated.

12, the concrete structure 6 is provided with a plurality of hoop-bar supporting columns 50 between the reinforcing-bar connecting plate 12 and the reinforcing-bar supporting plate 20. Circular or spiral hoop bars 16, 16 may be supported. In addition, the same reference numerals are given to the same configurations as those of the above-described embodiment.

A cylindrical form member 51 for forming the vertical hole 7 during molding of the concrete structure 6 is arranged outside the hoop-bar support columns 50 , 50 .

The form members 51 serve to separate the concrete from the hoop-bar support columns 50, 50 and the hoop-bar support columns 16, 16 when the concrete structure 6 is formed. It is left as it is in the vertical hole 7 due to the installation.

As shown in FIG. 13, the hoop-bar supporting columns 50, 50, . . . are spaced apart from each other, and their ends are respectively fixed to the reinforcing bar connection plate 12 and the reinforcing bar support plate 20 by welding or the like.

The inner diameters of the hoop bars 16, 16 are set so as to be positioned outside the through-holes 12b, 20b for reinforcing reinforcing bars, and are fixed to the hoop bar support columns 50, 50, . . .

Then, by inserting the reinforcing bars 8, 8, ... into the through holes 12b, 20b for reinforcing bars, the reinforcing bars 8, 8... are inserted inside the hoop bars 16, 16 as shown in FIG. It's becoming

Each of the reinforcing bars 8, 8, ... has a threaded portion at its upper end, and is suspended through the reinforcing reinforcing bar through holes 20b, 20b, ... of the reinforcing bar support plate 20, and through the reinforcing reinforcing bar through holes 12b, 12b, ... of the reinforcing bar connection plate 12. It is fixed to the reinforcing bar support plate 20 by tightening the nut 21 to the threaded portion of the upper end portion in a state of being penetrated.

The inserted reinforcing bars 8, 8, .

Then, as in the above-described embodiment, concrete is poured into the gap between the reinforcing bar connection plate 12 and the bottom formwork member 15 and the pile column 3 through the work hole 20a and the guide hole 12a from the upper surface of the vertical hole 7. Place 9 (primary placement).

After that, the filling state of the concrete that has been primarily cast is checked, and as shown in FIG. A concrete structure 6 made of a precast concrete member is joined to the upper end of the .

Further, in the above-described embodiment, an example in which the upper ends of the reinforcing reinforcing bars 8, 8, . . . The fixing plate 52 supports the upper ends of the plurality of reinforcing bars 8, 8, . , the upper ends of the reinforcing bars 8, 8, . . . may be supported by the reinforcing bar support plate 20. It should be noted that the same reference numerals are given to the same configurations as those of the above-described embodiment, and the description thereof will be omitted.

In this case, it is desirable to constrain the outer side of the reinforcing bar group 8A consisting of a plurality of reinforcing reinforcing bars 8, 8, . . .

The reinforcing bar group insertion opening 53 formed in the reinforcing bar support plate 20 is formed in a circular hole shape penetrating the reinforcing bar support plate 20 in the plate thickness direction, and the reinforcing bar group 8A composed of a plurality of reinforcing reinforcing bars 8, 8, . The size is such that the hoop reinforcement 54 that constrains the outside can be inserted.

The fixing plate 52 is formed in an annular shape having a working hole 52a in the center. It has reinforcing bar through holes 52b, 52b, . . . .

The fixing plate 52 has an outer diameter larger than the inner diameter of the reinforcing-bar group insertion opening 53, and its outer edge is the edge of the reinforcing-bar group insertion opening 53, that is, the reinforcing bar support outside the reinforcing-bar group insertion opening 53. It is designed to be supported on the upper surface of the plate 20 .

The reinforcing reinforcing bars 8, 8, . . . hang down through the reinforcing reinforcing bar through holes 52b, 52b, . .

In addition, the shape of the fixing plate 52 is not limited to a circular shape. Anything is fine.

In the method for joining the head of the pile pillar-shaped body configured in this way, as shown in FIG. A reinforcing bar group 8A consisting of a plurality of reinforcing reinforcing bars 8, 8 supported by a plate 52 and restrained by hoop bars 54 is lowered from above the vertical hole 7 and inserted into the reinforcing bar group insertion opening 53.

Then, when the reinforcing bar group 8A is lowered to a predetermined position, the reinforcing reinforcing bars 8, 8, . . . .

At this time, since the reinforcing reinforcing bars 8, 8, ... are supported by the fixing plate 52, the positions of the reinforcing reinforcing bars 8, 8, ... automatically correspond to the positions of the reinforcing reinforcing bar through holes 12b, 12b, ... of the reinforcing bar connection plate 12. is adapted to be inserted.

When the reinforcing bar group 8A is further lowered, as shown in FIG. 18, the outer edge of the fixing plate 52 is supported by the edge of the reinforcing bar group insertion opening 53, and the upper ends of the reinforcing bars 8, 8, . It is supported by the reinforcing bar support plate 20 via the plate 52 .

. . and the hoop bars 54 are installed at predetermined positions in the vertical hole 7. As shown in FIG.

Then, as in the above-described embodiment, concrete is poured into the gap between the reinforcing bar connection plate 12 and the bottom formwork member 15 and the pile column 3 through the work hole 52a and the guide hole 12a from the upper surface of the vertical hole 7. Place 9 (primary placement).

After that, the filling state of the concrete that has been primarily placed is checked, and as shown in FIG. A concrete structure 6 made of a precast concrete member is joined to the upper end of the .

Next, another embodiment of the pile head joint structure according to the present invention will be described with reference to FIGS. 20 to 24. FIG. It should be noted that the same reference numerals are assigned to the same configurations as in the above-described embodiment, and the description thereof will be omitted.

As shown in FIG. 20, this pile columnar head joint structure is supported by the upper end of the pile columnar body 3 and provided with an annular cushioning member 60 arranged below the reinforcing bar connection plate 12. The pile pillar-shaped body 3 and the concrete structure 6 are joined via a drawn portion 61 formed in the .

This head joint structure of the pile column 3 uses a height adjustment member 63 having a supporting convex portion 62 for supporting the reinforcing bar connection plate 12, and an annular cushioning member 60 on the outside of the supporting convex portion 62. Joining work is performed with the

As shown in FIG. 21, the height adjusting member 63 is composed of convex steel plates 64, 64 having a convex portion 64a at the center of the upper end. A cross-shaped supporting projection 62 is formed in which the projections 64a intersect each other and protrude upward from the surroundings.

Then, while adjusting the height, the height adjusting member 63 is inserted into the pile head, and the steel plates 64, 64 are fixed to the upper end portion of the pile columnar body 3 by welding or the like.

Further, the height adjusting member 63 is formed with a cushioning member fitting portion into which the annular cushioning member 60 is fitted by the concave portion of the upper end of the steel plate around the supporting convex portion 62 .

The cushioning member 60 is made of a low-resilience material such as styrofoam, urethane foam, rubber sponge, or the like, and has an annular shape with an opening in the center that fits the supporting protrusion 62 .

The cushioning member 60 has a thickness equal to or greater than the height of the supporting protrusions 62 , and the upper surface of the cushioning member 60 is positioned so that the reinforcing bar connecting plate 12 is supported by the supporting protrusions 62 supporting the reinforcing bar connecting plate 12 . 12 is adapted to abut.

Triangular mounting plates 65, 65 . . . A guide member 13 inserted into the hole 12a is detachably attached.

In order to join the concrete structure 6 and the pile column 3, as shown in FIG. The connection plate 12 is guided by the guide member 13 to guide the concrete structure 6 to the installation position, the reinforcing bar connection plate 12 is supported by the pile column-shaped body 3 via the height adjustment member 63, and the concrete structure 6 is formed into a pile column shape. The body 3 is temporarily supported.

At this time, by guiding the reinforcement connection plate 12 through the guide member 13 through the guide hole 12a, the positions of the pile columnar body 3 and the concrete structure 6 can be easily aligned.

Further, by supporting the reinforcing bar connection plate 12 on the support projections 62 , the cushioning member 60 is arranged in contact with the bottom of the reinforcing bar connection plate 12 .

Further, by supporting the concrete structure 6 on the pile column 3 , the lower opening of the vertical hole 7 is closed by the bottom formwork member 15 .

After the concrete structure 6 is temporarily supported by the pile column 3 and stabilized, the guide member 13 and the mounting plates 65, 65 are removed.

Next, as shown in FIG. 23, vertical reinforcing bars 8, 8, . . . Along with fixing, hoop bars 16, 16... are arranged with a vertical interval on the outer side of the reinforcing bars 8, 8... and fixed with binding wires.

At that time, since the pile pillar-shaped body 3 and the reinforcing bar connection plate 12 are precisely aligned by the guide member 13, the reinforcing reinforcing bars 8, 8 to be penetrated through the reinforcing reinforcing bar through holes 12b, 12b, . . . The positions of … are automatically positioned and can be easily installed.

Then, concrete 66 is poured into the gap 67 sandwiched between the reinforcing bar connecting plate 12, the bottom form member 15 and the buffer member 60 and the pile column 3 through the guide hole 12a from the upper surface of the vertical hole 7, as shown in FIG. (primary casting).

In this primary placement, since the buffer member 60 is placed under the reinforcing bar connection plate 12 , the buffer member 60 functions as a formwork, and the diameter of the buffer member 60 is larger than that of the pile column 3 . is formed.

After that, after curing and solidifying the primary cast concrete, as shown in FIG. After that, the cast-in-place concrete 9 is put into the vertical hole 7 (secondary casting), and cured and solidified, so that the concrete structure 6 made of precast concrete members is placed on the upper end of the pile columnar body 3 via the narrowed portion 61. are spliced.

In the joint structure of the pile column 3 configured in this way, the concrete structure 6 and the pile column 3 are joined via the narrowed portion 61 smaller than the diameter of the pile column 3, and the concrete structure 6 A buffer member 60 is interposed between and the pile columnar body 3 .

Further, reinforcing reinforcing bars 8, 8 are arranged across the concrete structure 6 and the pile columnar body 3. As shown in FIG.

Therefore, the pile column 3 and the concrete structure 6 are semi-rigidly joined, and when stress acts on the pile head due to an earthquake or the like, the pile column 3 swings horizontally or in the rotational direction with respect to the concrete structure 6. Therefore, it is possible to reduce the bending moment generated at the joint, and to design the pile column 3 and the concrete structure 6 rationally.

Next, other aspects of the head joint structure and joint method for pile columns according to the present invention will be described based on the embodiments shown in FIGS. 25 to 29. FIG.

In this embodiment, a case will be described in which a concrete structure 31 such as a footing made of cast-in-place concrete is joined to the head of a foundation pile that is a pile pillar-shaped body 30. In the figure, reference numeral 30 denotes a foundation pile, and reference numeral 31 denotes a footing. be.

The footing 31 has a reinforcing bar connecting plate 32 supported by the head of the pile column 30 at its lower part, and vertically oriented reinforcing reinforcing bars 33, 33... penetrate through this reinforcing bar connecting plate 32 at intervals in the circumferential direction. At the same time, the horizontal reinforcing bars 34, 34, ... embedded in the concrete structure 31 are fixed, and the pile head bending moment is resisted by the reinforcing reinforcing bars 33, 33, ... arranged astride the pile head and the concrete structure 31. It is structured.

In order to join the pile column 30 and the concrete structure 31, first, as shown in FIG. While projecting the upper end from the ground surface, the earth and sand inside the pile columnar body 30 are excavated to a predetermined depth.

Crushed stones are laid on the ground surface to form a crushed stone layer 35, and a leveling concrete 36 is placed on the crushed stone layer 35 to level the ground surface uniformly.

Next, as shown in FIG. 27, the protruding height of the pile pillar-shaped body 30 is measured, and the height adjusting member 38 formed in a plate-like or bar-like shape made of steel is adjusted according to the height. , 38 . and fix it by welding or the like.

It should be noted that the height adjusting members 38, 38 do not necessarily need to be used, and the rebar connection plate 32 is directly placed on the pile column 30 according to the measurement result of the protrusion height of the pile column 30, and its position may be fixed by welding or the like.

Further, the height adjusting member 11 and the guide member 13 may be used for positioning the reinforcing bar connection plate 32 with respect to the pile column 30, as in the embodiment shown in FIGS.

Next, as shown in FIG. 28, vertical reinforcing bars 33, 33, . . . While fixing, hoop bars 39, 39... are arranged with a vertical interval on the outer side of the strong reinforcing bar and fixed with a binding wire.

At that time, the positions of the reinforcing reinforcing bars 33, 33, which are penetrated through the reinforcing reinforcing bar through holes 32b, 32b, ... of the reinforcing bar connecting plate 32 are also automatically positioned, and can be easily attached.

Then, when the installation of the reinforcing bars 33, 33, . The filling concrete may be placed at the same time as the cast-in-place concrete forming the concrete structure 31, which will be described later.

Next, as shown in FIG . 29, horizontal reinforcing bars 34, 34, . It is fixed to the reinforcing bar connecting plate 32 .

In addition, horizontal reinforcing bars 42, 42, .

After the placement of the horizontal reinforcing bars 34, 34, the horizontal reinforcing bars 42, 42 and the stirrups 43, 43 is completed, the formwork 41 is erected and installed.

Then, as shown in FIG. 25, concrete is poured into the formwork 41 to form the concrete structure 31, and the concrete is cured and solidified to join the pile column 30 and the concrete structure 31. be.

1 Pile support structure 2 Underwater ground 3 Pile column 4 Beam 5 Floor slab 6 Concrete structure 7 Vertical hole 8 Reinforcement bar 9 Concrete 10 Bottom formwork 11 Height adjustment member 12 Reinforcement connecting plate 13 Guide member 14 Horizontal rebar 15 Bottom formwork member 16 Hoop bar 17 Horizontal reinforcing bar 18 Relay reinforcing bar 20 Reinforcing bar support plate 30 Pile column 31 Concrete structure 32 Reinforcement connecting plate 33 Reinforcing bar 34 Horizontal reinforcing bar 35 Crushed stone layer 36 Leveled concrete 38 Height adjustment member 39 Hoop Bar 40 Concrete 41 Formwork 42 Horizontal reinforcing bar 43 Stirrup 50 Hoop bar support column 51 Formwork material 52 Fixing plate 53 Reinforcing bar group insertion opening 54 Hoop bar 60 Cushioning member 61 Constricted portion 62 Supporting convex portion 63 Height adjusting member 64 steel plate 65 mounting plate 66 concrete 67 void

Claims (20)

In the head joint structure of the pile pillar-shaped body, in which the concrete structure is joined to the head of the pile pillar-shaped body,
A reinforcing bar connection plate arranged at the bottom of the concrete structure and supported by the head of the pile column,
Horizontal reinforcing bars embedded in the concrete structure are fixed in the reinforcing bar connection plate, and through holes for reinforcing reinforcing bars through which the reinforcing bars placed across the concrete structure and the pile column are passed. A head joint structure of a pile columnar body, characterized by comprising: 2. The pile column according to claim 1, wherein the pile column has a height adjusting member at the pile head, and the reinforcing bar connection plate is supported by the pile column head via the height adjusting member. Head junction structure of the body. 3. The head portion of the pile column according to claim 1, wherein the concrete structure is a precast concrete member, and the reinforcing bar connection plate is arranged below a vertical hole formed in the precast concrete member. junction structure. A reinforcing bar support plate is provided above the reinforcing bar connection plate with a space therebetween, and horizontal reinforcing bars embedded in the concrete structure are fixed to the reinforcing bar supporting plate, and the reinforcing reinforcing bars are fixed to the reinforcing bar support plate. The head joint structure of the pile columnar body according to any one of . 5. The pile columnar head joint structure according to claim 4, wherein the reinforcing bar support plate has a reinforcing bar through hole through which the reinforcing bar is passed. The reinforcing bar support plate is provided with a reinforcing bar group insertion opening through which a reinforcing bar group consisting of a plurality of reinforcing bars is inserted, and a fixing plate whose outer edge is supported by the edge of the reinforcing bar group insertion opening. prepared,
Upper ends of the plurality of reinforcing bars are supported by the fixing plate, the plurality of reinforcing bars are supported by the reinforcing bar support plate via the fixing plate, and the reinforcing bars supported by the fixing plate are supported by the fixing plate. 5. The pile columnar head joint structure according to claim 4, wherein the reinforcing reinforcing bar through hole formed in the reinforcing bar connection plate is penetrated. 7. The head joint structure of a pile column according to claim 6, wherein the outer side of a group of reinforcing bars made up of a plurality of reinforcing bars whose upper ends are supported by said fixing plate is restrained by annular or spiral hoop bars. 7. The method according to any one of claims 4 to 6, wherein a plurality of hoop-bar supporting columns are provided between said reinforcing-bar connecting plate and said reinforcing-bar supporting plate, and annular or spiral hoop bars are supported by said hoop-bar supporting columns. The head joint structure of the described pile column. 9. The head joint structure of a pile column according to claim 8, wherein a form member for forming a vertical hole is provided outside the plurality of hoop-bar supporting columns. A guide member is detachably protruding from the head of the pile pillar-shaped body and is inserted into a guide hole opened in the reinforcing bar connection plate, and the through hole for reinforcing reinforcing bar extends outwardly of the guide hole in the circumferential direction. The head joint structure of the pile columnar body according to any one of claims 1 to 9, which are arranged at intervals. An annular cushioning member supported on the upper end of the pile columnar body and arranged under the reinforcing bar connection plate is provided, and the pile columnar body and the concrete structure are connected to each other via a constricted portion formed inside the cushioning member. The head joint structure of the pile columnar body according to any one of claims 1 to 10, wherein the is joined. In a method for joining the head of a pile column to join a concrete structure to the head of the pile column,
A reinforcing bar connection plate arranged at the bottom of the concrete structure and having horizontal reinforcing bars embedded in the concrete structure fixed ,
The reinforcing bar connecting plate is supported by the head of the pile columnar body, and in this state, reinforcing reinforcing bars are arranged across the upper and lower sides of the reinforcing bar connecting plate through the through holes for reinforcing reinforcing bars formed in the reinforcing bar connecting plate, and then 1. A method for joining the head of a columnar pile, characterized in that the concrete structure is joined to the head of the columnar pile by pouring concrete. The concrete structure is a precast concrete member, and the reinforcing-bar connecting plate is arranged below a vertical hole formed in the precast-concrete member, and the reinforcing-bar connecting plate is attached to the head of the pile column. to support the precast concrete member, and in that state, a reinforcing reinforcing bar is arranged across the precast concrete member and the pile column through a through hole for reinforcing reinforcing bar formed in the reinforcing bar connection plate, and then the vertical 13. The method for joining the head of a pile column according to claim 12, wherein a precast concrete member is joined to the head of the pile column by pouring concrete into the hole. 14. The head joint of the pile column according to claim 12 or 13, wherein a height adjusting member whose height is adjusted is fixed to the head of the pile column, and the reinforcing bar connecting plate is supported on the height adjusting member. Method. The height adjusting member has a supporting convex portion for supporting the reinforcing-bar connection plate in the central portion, and the supporting convex portion is fitted with an annular cushioning member fitted to the outside of the supporting convex portion. The reinforcement connecting plate is supported, and then the concrete is placed to join the pile column and the concrete structure, and a narrowed portion smaller than the diameter of the pile column is formed inside the cushioning member. 15. The method of joining the head of a pile column according to claim 14, wherein the pile column and the concrete structure are joined via the drawn portion. A guide member detachably attached to the head of the pile pillar-shaped body is fitted with a guide hole opened in the reinforcing bar connecting plate, and the reinforcing bar connecting plate is guided by the guide member to move the concrete structure to the installation position. 16. Any one of claims 12 to 15, wherein the reinforcing reinforcing bar is inserted into the reinforcing reinforcing bar through-holes arranged at intervals in the circumferential direction outside the guide hole by guiding the pile columnar body to support the reinforcing bar connection plate. 1. The head joint method of the pile columnar body according to 1. A reinforcing bar support plate is provided above the reinforcing bar connecting plate with a space therebetween, and the horizontal reinforcing bar embedded in the concrete structure is fixed to the reinforcing bar supporting plate, and the reinforcing reinforcing bar is fixed to the reinforcing bar support plate. The method for joining the head of a pile columnar body according to any one of the above. The upper ends of a plurality of reinforcing reinforcing bars are supported by a fixing plate, and after supporting the concrete structure made of precast concrete members on the head of the pile column via the reinforcing bar connection plate, the fixing plate A plurality of supported reinforcing reinforcing bars are inserted through reinforcing bar group insertion openings formed in the reinforcing bar support plate and through the reinforcing reinforcing bar through-holes formed in the reinforcing bar connection plate to form the outer edge of the fixing plate. is supported on the edge of the reinforcing bar group insertion opening, and the upper end of each reinforcing reinforcing bar is supported on the reinforcing bar support plate via the fixing plate. 19. The method of joining the head of a pile column according to claim 18, wherein the outer side of a group of reinforcing bars comprising a plurality of reinforcing bars whose upper ends are supported by the fixing plate is restrained by annular or spiral hoop bars. 19. The method according to claim 17 or 18, wherein a plurality of hoop-bar supporting columns are provided between the reinforcing-bar connection plate and the reinforcing-bar supporting plate, and the hoop-bar supporting columns support annular or spiral hoop bars. A method for joining the head of a pile column.

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