JP2020070627A - Joint structure of pile and foundation concrete portion, precast concrete body, and construction method - Google Patents

Abstract

To provide a joint structure 1 of a pile 2 and a foundation concrete portion 4 capable of shortening work time in an excavation area in which a pile head portion 20 is exposed.SOLUTION: The joint structure 1 of the pile 2 and the foundation concrete portion 4 comprises: the pile head portion 20 of the pile 2; a precast concrete body 30 around the pile head portion 20; and the foundation concrete portion 4 above the precast concrete body 30. The precast concrete body 30 includes an upper face 31, a lower face 32, a through hole 33, and a plurality of vertical reinforcements 34. The through hole 33 has an inner diameter R2 larger than an outer diameter R1 of the pile head portion 20. The pile head portion 20 and the precast concrete body 30 are joined by concrete filled into a gap formed by the inserted pile head portion 20 into the through hole 33. The vertical reinforcement 34 inside the foundation concrete portion 4 joins the precast concrete body 30 and the foundation concrete portion 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a joint structure between a pile and a foundation concrete portion, a precast concrete body, and a construction method.

  BACKGROUND ART Conventionally, as a joint structure for joining a pile head of a pile and a foundation concrete portion in a pile foundation of a building, for example, a joint structure of a pile head as disclosed in Patent Document 1 has been proposed. In this joint structure, a plurality of pile head reinforcing bars extending in the vertical direction are welded around the pile head, and then the foundation concrete portion is placed so as to swallow the pile head into the inside of the foundation concrete portion. In this case, in order to expose the pile head, excavate the periphery of the pile, place level concrete around the pile head, weld the pile head reinforcement, and arrange the reinforcement under the footing. A formwork is assembled around and the concrete is placed.

Japanese Patent No. 6253916

  However, in the construction of the joint structure of Patent Document 1, it is necessary to work for a long time in the excavation area where the pile head is exposed. I have to do some work. Working in muddy water has a low working efficiency, and there is also a risk of deterioration in the quality of the joint structure. Generally, the pile has a structure that swallows about 100 mm into the foundation, but especially when the structure is adopted in which the pile is swallowed deeper (for example, about 500 mm) to prevent damage to the pile due to horizontal force on the building. There is. In this case, it is necessary to work in the excavation area that has been excavated deeper than general excavation.

  Therefore, the present invention provides a joint structure between a pile and a foundation concrete part, which can shorten the working time in the excavation area where the pile head is exposed. Further, the present invention provides a precast concrete body capable of shortening the working time in the excavation area where the pile head is exposed. Furthermore, the present invention proposes a construction method in which the working time is short in the excavation area where the pile head is exposed.

  The present invention has been made to solve at least a part of the problems described above, and can be realized as the following aspects or application examples.

[1] One aspect of a joint structure between a pile and a foundation concrete portion according to the present invention is
A joint structure for joining a pile and a foundation concrete part,
A pile head of the pile,
A precast concrete body around the pile head,
The basic concrete portion on the precast concrete body,
Equipped with
The precast concrete body includes an upper surface, a lower surface facing the upper surface, a through hole penetrating from the upper surface to the lower surface, and a plurality of vertical streaks extending upward from the upper surface,
The through hole has an inner diameter larger than the outer diameter of the pile head,
The pile head and the precast concrete body are joined by concrete filled in a gap formed by inserting the pile head into the through hole,
The vertical streak inside the basic concrete part joins the precast concrete body and the basic concrete part.

  According to one aspect of the joint structure between the pile and the foundation concrete part, the working time in the excavation area with the pile head exposed by the structure for joining the pile head and the foundation concrete part through the precast concrete body. Can be shortened.

[2] In one aspect of a joint structure between the pile and the foundation concrete portion,
The outer peripheral surface of the joint between the precast concrete body and the basic concrete portion may be formed so that the outer surface of the precast concrete body and the side surface of the basic concrete portion are flush with each other.

  According to one aspect of the joint structure between the pile and the foundation concrete portion, since the foundation concrete portion is formed on the precast concrete body, it is not necessary to drive the foundation concrete portion around the precast concrete body and excavate. The work time in the area can be shortened.

[3] One aspect of the precast concrete body according to the present invention is
A precast concrete body for joining a pile head portion of a pile and a foundation concrete portion,
The top surface,
A lower surface facing the upper surface,
A through hole penetrating from the upper surface to the lower surface,
A plurality of vertical stripes extending upward from the upper surface,
An outer surface connecting the upper surface and the lower surface,
An earth retaining formwork that extends upward from the upper end of the outer side surface and surrounds the upper surface,
Equipped with
The through hole has a circular cross section and an inner diameter larger than an outer diameter of the pile head.

  According to one aspect of the precast concrete body, if the precast concrete body is arranged around the pile head, the work in the excavation area in which the pile head is exposed ends, so that the work time in the excavation area can be shortened. You can

[4] One aspect of the construction method according to the present invention is
A construction method for joining a pile and a foundation concrete part,
A step of manufacturing a precast concrete body including an upper surface, a lower surface facing the upper surface, a through hole penetrating from the upper surface to the lower surface, and a plurality of vertical streaks extending upward from the upper surface;
Excavating the periphery of the pile to expose the pile head of the pile in the excavation area,
Installing the precast concrete body in the excavation region by inserting the pile head exposed in the through hole,
Backfilling the periphery of the precast concrete body installed in the excavation area,
A first pouring step of pouring concrete into the gap between the through hole and the pile head;
A step of arranging reinforcing bars connected to the vertical bars,
Installing a formwork surrounding the bar arrangement including the vertical bars,
A second placing step of placing concrete in the form to build the basic concrete portion, and integrating the basic concrete portion, the pile head and the precast concrete body;
It is characterized by including.

  According to one aspect of the construction method, since the excavation region can be backfilled by disposing the precast concrete body in the excavation region, the work time in the excavation region where the pile head is exposed is shortened.

[5] In the construction method,
The step of manufacturing the precast concrete body further includes a step of providing an earth retaining formwork that extends upward from an upper end of an outer surface connecting the upper surface and the lower surface and surrounds the upper surface,
The backfilling step can be backfilled to a position higher than the upper surface and lower than the upper end of the earth retaining mold.

  According to one aspect of the construction method, the work of the backfilling step is facilitated by including the step of providing the earth retaining mold.

  ADVANTAGE OF THE INVENTION According to this invention, the joint structure of the pile and foundation concrete part which can shorten the working time in the excavation area which exposed the pile head can be provided. Moreover, according to this invention, the precast concrete body which can shorten the working time in the excavation area which exposed the pile head can be provided. Further, according to the present invention, it is possible to propose a construction method in which the working time in the excavation area where the pile head is exposed is short.

It is a schematic diagram of a building using the joining structure concerning this embodiment. It is a schematic diagram of the joining structure which concerns on this embodiment. It is a longitudinal cross-sectional view of the precast concrete body according to the present embodiment. It is a top view of the precast concrete body concerning this embodiment. It is a flowchart of the construction method which concerns on this embodiment. It is a schematic diagram explaining the construction method which concerns on this embodiment. It is a schematic diagram explaining the construction method which concerns on this embodiment. It is a schematic diagram explaining the construction method which concerns on this embodiment. It is a schematic diagram explaining the construction method which concerns on this embodiment. It is a schematic diagram explaining the construction method which concerns on this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the invention described in the claims. In addition, not all of the configurations described below are essential configuration requirements of the invention.

  One aspect of a joint structure between a pile and a foundation concrete portion according to an embodiment of the present invention is a joint structure for joining a pile and a foundation concrete portion, and a pile head portion of the pile and a pile head portion of the pile head portion. A surrounding precast concrete body and the basic concrete portion on the precast concrete body are provided, and the precast concrete body penetrates from the upper surface to the lower surface and the lower surface facing the upper surface. Through holes, and a plurality of vertical stripes extending upward from the upper surface, the through hole has an inner diameter larger than the outer diameter of the pile head, the pile head and the precast concrete body, The pile head is inserted into the through hole and joined by concrete filled in a gap, and the vertical streaks inside the basic concrete portion are the plexi Wherein the bonding strike the concrete body and the said foundation concrete portion.

  One aspect of a precast concrete body according to an embodiment of the present invention is a precast concrete body that joins a pile head portion and a foundation concrete portion of a pile, and an upper surface, a lower surface facing the upper surface, and the upper surface. A through hole penetrating to the lower surface, a plurality of vertical stripes extending upward from the upper surface, an outer surface connecting the upper surface and the lower surface, and an earth retaining type extending upward from the upper end of the outer surface and surrounding the upper surface. A frame, and the through hole has a circular cross section and an inner diameter larger than an outer diameter of the pile head.

  One aspect of a construction method according to an embodiment of the present invention is a construction method for joining a pile and a foundation concrete part, and a top surface, a bottom surface facing the top surface, and a penetration penetrating from the top surface to the bottom surface. A step of manufacturing a precast concrete body comprising a hole and a plurality of vertical streaks extending upward from the upper surface, and a step of excavating the periphery of the pile to expose the pile head of the pile in an excavation area, Installing the precast concrete body in the excavation area by inserting the pile head exposed in the through hole, backfilling the periphery of the precast concrete body installed in the excavation area, and the through hole And a step of placing concrete in the gap between the pile head and the head of the pile, a step of arranging reinforcing bars connected to the vertical bars, and a formwork is installed surrounding the bar including the vertical bars. Process A second pouring step of pouring concrete into the formwork to construct the basic concrete part, and integrating the basic concrete part, the pile head and the precast concrete body. And

1. Joining Structure A joining structure 1 of the pile 2 and the foundation concrete portion 4 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram of a building 6 using the joint structure 1 according to the present embodiment, and FIG. 2 is a schematic diagram of the joint structure 1 according to the present embodiment.

  As shown in FIG. 1, the building 6 has a plurality of piles 2 buried in the ground and a foundation concrete portion 4 joined to the plurality of piles 2. The foundation concrete portion 4 may include a beam connecting the plurality of piles 2 to each other. The pile 2 and the foundation concrete part 4 are joined by the joining structure 1.

  As shown in FIG. 2, the joint structure 1 is the joint structure 1 that joins the pile 2 and the foundation concrete portion 4. The pile 2 is a well-known pile used for a pile foundation, and is, for example, a steel pile, a ready-made concrete pile, a synthetic pile, or the like. The basic concrete portion 4 is made of concrete having reinforcing bars arranged inside.

  The joint structure 1 includes a pile head 20 of a pile 2, a precast concrete body 30 around the pile head 20, and a foundation concrete portion 4 on the precast concrete body 30. The pile head 20 is a tip portion of the pile 2 on the side of the foundation concrete portion 4 and is a tip portion of the pile 2 exposed by excavation in a construction method described later. The pile 2 is a column, and the inside of the pile 2 is filled with cement milk. Part or all of the cement milk in the height direction of the pile head 20 is removed, and concrete is placed inside the pile head 20 from which the cement milk has been removed.

The precast concrete body 30 includes an upper surface 31, a lower surface 32 facing the upper surface 31, a through hole 33 penetrating from the upper surface 31 to the lower surface 32, a plurality of vertical streaks 34 extending upward from the upper surface 31, and an outer peripheral edge of the upper surface 31. And an outer side surface 35 connecting the outer peripheral edge of the lower surface 32. The upper surface 31 is flat and has, for example, a rectangular shape in a plan view, and a through hole 33 is opened at the center position thereof. The lower surface 32 is on the foundation ground in the ground and supports the precast concrete body 30. The lower surface 32 is flat and has the same outer shape as the upper surface 31. A through hole 33 opens at the center of the lower surface 32. The vertical bar 34 is a reinforcing bar that extends from the inside of the precast concrete body 30 to the upper surface 31 and extends upward from the upper surface 31, and is integrated with the precast concrete body 30.

  The through hole 33 has a circular cross section and has an inner diameter R2 larger than the outer diameter R1 of the pile head 20. Therefore, a gap is formed between the through hole 33 and the pile head 20 in a state where the pile head 20 is inserted into the through hole 33. The pile head 20 and the precast concrete body 30 are joined by the concrete filled in the gap. The height of the pile head 20 swallowed into the through hole 33 is equal to or larger than the outer diameter R1 of the pile head 20, and is, for example, the outer diameter R1 + 100 mm. In order to improve the joint strength between the pile head 20 and the precast concrete body 30, at least one of the facing surfaces of the pile head 20 and the through hole 33 is provided with a plurality of protrusions protruding from the surface. May be.

  The vertical streak 34 inside the basic concrete part 4 joins the precast concrete body 30 and the basic concrete part 4. The basic concrete portion 4 is formed by placing concrete on the precast concrete body 30 having the vertical streaks 34. The inside of the basic concrete part 4 includes a large number of reinforcing bars arranged with respect to the longitudinal bars 34, and these reinforcing bars firmly join the basic concrete part 4 and the precast concrete body 30.

  According to the joining structure 1, the pile head 20 and the foundation concrete portion 4 are joined to each other through the precast concrete body 30, so that the pile head 20 is exposed by the conventional excavation. Since there is no need to perform work such as bar arrangement or concrete placement around the ground, work time in the excavation area can be shortened.

  The outer peripheral surface 10 of the joint between the precast concrete body 30 and the basic concrete portion 4 is formed so that the outer surface 35 of the precast concrete body 30 and the side surface 45 of the basic concrete portion 4 are flush with each other. The side surface 45 is a portion that forms the vicinity of the lower end of the basic concrete portion 4 adjacent to the upper side of the outer side surface 35. Around the precast concrete body 30 is a backfill part 62, and a level concrete 60 is placed above the backfill part 62. According to the joint structure 1, since the basic concrete portion 4 is formed on the precast concrete body 30, it is not necessary to place the basic concrete portion 4 around the precast concrete body 30, and the working time in the excavation area is reduced. It can be shortened. It should be noted that the term "flush" not only represents a state in which the outer peripheral surface 10 has no irregularities, but also includes a tolerance and a level difference to the extent that an equivalent function can be obtained.

2. Precast Concrete Body A precast concrete body 30 according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a vertical sectional view of the precast concrete body 30 according to the present embodiment, and FIG. 4 is a plan view of the precast concrete body 30 according to the present embodiment. A description overlapping with the description of the bonding structure 1 will be omitted.

  The precast concrete body 30 shown in FIGS. 3 and 4 is installed around the pile head 20 and joins the pile head 20 of the pile 2 and the foundation concrete part 4 together. The precast concrete body 30 is a so-called precast concrete product that is manufactured in advance before being installed around the pile 2. The precast concrete body 30 is manufactured in a place different from the excavation region of the pile 2, for example, above the excavation region, on the ground where there is no fear of muddy water due to rise of rainwater or groundwater level. The precast concrete body 30 is preferably manufactured near the construction site of the pile foundation in order to facilitate transportation.

The precast concrete body 30 includes an upper surface 31, a lower surface 32 facing the upper surface 31, a through hole 33 penetrating from the upper surface 31 to the lower surface 32, and a plurality of vertical streaks 34 extending upward from the upper surface 31.
An outer surface 35 connecting the upper surface 31 and the lower surface 32, and an earth retaining mold 36 extending upward from the upper end of the outer surface 35 and surrounding the upper surface 31. The upper surface 31 is a flat square, and there are earth retaining molds 36 along the outer periphery of the upper surface 31, and a plurality of vertical streaks 34 project at predetermined intervals along the inner side of the earth retaining molds 36. The earth retaining mold 36 has an inner surface arranged along the outer peripheral edge of the upper surface 31, and an outer surface outside the outer surface 35. The lower end of the vertical bar 34 extends from the upper surface 31 to the inside of the precast concrete body 30 and is arranged together with other reinforcing bars (not shown).

  The through hole 33 has a circular cross section and has an inner diameter R2 larger than the outer diameter R1 of the pile head 20. If the precast concrete body 30 is arranged around the pile head 20, the work in the excavation area where the pile head 20 is exposed is completed, so that the work time in the excavation area can be shortened.

  The inner diameter R2 of the through hole 33 is, for example, 200 mm larger than the outer diameter R1 of the pile head 20. Since the inner diameter R2 of the through hole 33 is larger than the outer diameter R1 of the pile head 20, the precast concrete body 30 can be installed at the regular position even if the pile core of the pile 2 is displaced.

  The earth retaining mold 36 has a height of, for example, 300 mm. Since the height of the earth retaining form 36 is higher than that of the upper surface 31, the periphery of the precast concrete body 30 can be backfilled and level concrete can be poured to the height of the earth retaining form 36. If level concrete can be placed around the precast concrete body 30, the steps around the precast concrete body 30 and the inclined surface around the excavation area are reduced, so that workability around the pile head 20 is improved and work safety is also improved. improves. Further, since the soil retaining form 36 is provided, even if the periphery of the precast concrete body 30 is backfilled, it is possible to prevent water or earth and sand from flowing into the upper surface 31 from the periphery. Further, the soil retaining form 36 can also serve as the form of the basic concrete portion 4 to be constructed on the precast concrete body 30.

3. Construction Method A construction method according to the present embodiment will be described with reference to FIGS. 5 to 10. FIG. 5 is a flowchart of the construction method according to this embodiment, and FIGS. 6 to 10 are schematic diagrams illustrating the construction method according to this embodiment. The construction method according to the present embodiment is a construction method for joining the pile 2 and the foundation concrete portion 4.

  As shown in FIG. 5, a step S10 of manufacturing a precast concrete body (“PCa” in FIG. 5), a step S20 of exposing a pile head, a step S22 of installing a precast concrete body, and a step S24 of backfilling. , A first placing step S26, a reinforcing step S28, a form setting step S30, and a second placing step S32. Step S10 of manufacturing the precast concrete body may further include a step of providing an earth retaining formwork.

  The step S10 of manufacturing the precast concrete body is preferably performed before excavating the periphery of the pile. Since the work in the excavation area can be omitted as compared with the conventional case, the time from excavation to installation of the precast concrete body can be shortened. In the step of producing a precast concrete body, the reinforcing bars are laid out, the formwork is assembled and concrete is cast in the same manner as known precast. The precast concrete body 30 manufactured in this manner has an upper surface 31, a lower surface 32 facing the upper surface 31, a through hole 33 penetrating from the upper surface 31 to the lower surface 32, and an upper surface as described with reference to FIGS. 3 and 4. And a plurality of vertical streaks 34 extending upward from 31.

In the step of providing the earth retaining formwork, after disassembling the formwork of the precast concrete body, the earth retaining formwork is fixed to the upper end of the outer side surface. As described with reference to FIGS. 3 and 4, the earth retaining mold 36 extends upward from the upper end of the outer side surface 35 connecting the upper surface 31 and the lower surface 32 and surrounds the upper surface 31.
By providing the earth retaining mold 36, there is no inflow of earth and sand or rainwater to the upper surface 31, and the work of the backfilling step S24 becomes easy.

  As shown in FIG. 6, in the step S20 of exposing the pile head 20, the periphery of the pile 2 is excavated to expose the pile head 20 of the pile 2 in the excavation region 8. The tip of the pile 2 exposed in the excavation area 8 is the pile head 20. The bottom 82 of the excavation area 8 may be leveled, for example, in the case of soft ground, cement may be sprinkled to harden the ground. The upper end 22 of the pile head 20 is located lower than the ground surface, so that the total height of the pile head 20 is lower than the depth of the excavation area 8. The excavation area 8 has a bottom portion 82 having a larger area than the lower surface of the precast concrete body. As shown in FIG. 7, the depth of the excavation region 8 is deeper than the height of the outer side surface 35 of the precast concrete body 30 and lower than the height of the precast concrete body 30 including the earth retaining form 36. The step S20 of exposing the pile head 20 may include a step of removing a part of the cement milk filled inside the pile head 20. The cement milk may be removed from the upper end 22 to the depth of the outer diameter R1 of the pile head 20. For example, the cement milk may be removed from the upper end 22 to a depth of about 50 mm and the mortar for marking out in the recess. May be placed.

  As shown in FIG. 7, in the step S22 of installing the precast concrete body 30, the pile head 20 exposed in the through hole 33 is inserted to install the precast concrete body 30 in the excavation area 8. The precast concrete body 30 can be installed above the bottom 82 of the excavation area 8 by moving the suspension wire 50 downward while the precast concrete body 30 is suspended by the suspension wire 50. At this time, since the inner diameter R2 of the through hole 33 is larger than the outer diameter R1 of the pile head 20, a gap R2-R1 is formed between the pile head 20 and the through hole 33.

  As shown in FIG. 8, in the backfilling step S24, the periphery of the precast concrete body 30 installed in the excavation area 8 is backfilled. According to the construction method of the present embodiment, since the excavation area 8 can be backfilled by disposing the precast concrete body 30 in the excavation area 8, the work time in the excavation area 8 with the pile head 20 exposed. It will be shorter than before. The backfilling portion 62 backfilled in the backfilling step S24 is backfilled to a position higher than the upper surface 31 and lower than the upper end of the earth retaining form 36.

  As shown in FIG. 9, in the first placing step S26, concrete is placed in the gap between the through hole 33 and the pile head 20. The pile head 20 and the precast concrete body 30 are joined by the first placing step S26. In the first placing step S26, concrete is also placed in the recess inside the pile head 20. The first placing step S26 may include a step of placing the level concrete 60 on the outside of the earth retaining mold 36. In the first placing step S26, leveling concrete may be placed on the upper surface 31.

  FIG. 10 shows a state after the step S28 of arranging the bar, the step S30 of installing the form and the second placing step S32.

  As shown in FIG. 10, in the reinforcing step S28, reinforcing bars connected to the vertical bars 34 extending from the upper surface 31 are arranged to construct a reinforcing bar structure 44. In the step S28 of arranging, since the work can be performed on the precast concrete body 30, it is not necessary to consider the muddy water in the excavation area 8, and the construction environment of the worker is improved. The reinforcing structure 44 arranged in the reinforcing step S28 becomes a part of the basic concrete portion 4. In the step S28 of arranging, the anchor unit 40 may be fixed on the upper surface 31, for example. As the anchor unit 40, a commercially available one can be used. For example, a lower plate 41 fixed to the upper surface 31, a plurality of column bases 42 extending upward from the lower plate 41, and a plurality of column bases 42 are provided. And a fixed upper plate 43.

  Although not shown, in step S30 of installing the formwork, a formwork that fits the outer shape of the basic concrete portion 4 is installed surrounding the bar arrangement including the vertical reinforcement.

  In the second placing step S32, concrete is placed in the formwork assembled in the process S30 of installing the formwork to construct the basic concrete part 4. By the second casting step S32, the foundation concrete part 4, the pile head 20 and the precast concrete body 30 are integrated.

  Conventionally, after excavation to expose the pile head 20 on site, level concrete placement, rebar construction, formwork construction, concrete placement into formwork, and demolding work However, according to the construction method according to the present embodiment, the steps in these excavation areas 8 can be omitted, so that the construction period can be shortened and the cost can be reduced accordingly. .. Further, for example, by manufacturing the precast concrete body 30 before the foundation work with a small amount of work, labor such as reinforcing work and formwork can be omitted from the foundation work, so that the leveling of labor can be achieved. it can. Further, for example, when rainwater or groundwater flows into the excavation area 8, securing the quality of the foundation work becomes a problem, but the construction method according to the present embodiment significantly reduces the work in the excavation area 8. Therefore, it becomes easier to secure quality.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the invention includes configurations that are substantially the same as the configurations described in the embodiments. Here, the "same configuration" is, for example, a configuration having the same function, method, and result, or a configuration having the same purpose and effect. Further, the invention includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. In addition, the invention includes a configuration that achieves the same effects as the configurations described in the embodiments or a configuration that can achieve the same object. Further, the invention includes configurations in which known techniques are added to the configurations described in the embodiments.

  DESCRIPTION OF SYMBOLS 1 ... Joining structure, 2 ... Pile, 4 ... Foundation concrete part, 6 ... Building, 8 ... Excavation area, 10 ... Peripheral surface, 20 ... Pile head, 22 ... Upper end, 30 ... Precast concrete body, 31 ... Top surface, 32 ... lower surface, 33 ... through hole, 34 ... vertical line, 35 ... outer side surface, 36 ... earth retaining form, 40 ... anchor unit, 41 ... lower plate, 42 ... column base, 43 ... upper plate, 44 ... reinforcing structure , 45 ... Side surface, 50 ... Suspension wire, 60 ... Level concrete, 62 ... Backfill part, 82 ... Bottom part, R1 ... Outer diameter, R2 ... Inner diameter

Claims (5)

A joint structure for joining a pile and a foundation concrete part,
A pile head of the pile,
A precast concrete body around the pile head,
The basic concrete portion on the precast concrete body,
Equipped with
The precast concrete body includes an upper surface, a lower surface facing the upper surface, a through hole penetrating from the upper surface to the lower surface, and a plurality of vertical streaks extending upward from the upper surface,
The through hole has an inner diameter larger than the outer diameter of the pile head,
The pile head and the precast concrete body are joined by concrete filled in a gap formed by inserting the pile head into the through hole,
The joint structure of a pile and a foundation concrete part in which the said vertical streak inside the said foundation concrete part joins the said precast concrete body and the said foundation concrete part. In claim 1,
The outer peripheral surface of the joint portion between the precast concrete body and the basic concrete portion, the outer surface of the precast concrete body and the side surface of the basic concrete portion are formed flush with each other, the joint structure of the pile and the basic concrete portion .. A precast concrete body for joining a pile head portion of a pile and a foundation concrete portion,
The top surface,
A lower surface facing the upper surface,
A through hole penetrating from the upper surface to the lower surface,
A plurality of vertical stripes extending upward from the upper surface,
An outer surface connecting the upper surface and the lower surface,
An earth retaining formwork that extends upward from the upper end of the outer side surface and surrounds the upper surface,
Equipped with
The through hole is a precast concrete body having a circular cross section and an inner diameter larger than an outer diameter of the pile head. A construction method for joining a pile and a foundation concrete part,
A step of manufacturing a precast concrete body including an upper surface, a lower surface facing the upper surface, a through hole penetrating from the upper surface to the lower surface, and a plurality of vertical streaks extending upward from the upper surface;
Excavating the periphery of the pile to expose the pile head of the pile in the excavation area,
Installing the precast concrete body in the excavation area by inserting the pile head exposed in the through hole,
Backfilling the periphery of the precast concrete body installed in the excavation area,
A first pouring step of pouring concrete in the gap between the through hole and the pile head;
A step of arranging reinforcing bars connected to the vertical bars,
Installing a formwork surrounding the bar arrangement including the vertical bars,
A second pouring step of pouring concrete into the formwork to construct the basic concrete portion, and integrating the basic concrete portion, the pile head and the precast concrete body;
Including the construction method. In claim 4,
The step of manufacturing the precast concrete body further includes a step of providing an earth retaining formwork that extends upward from an upper end of an outer surface connecting the upper surface and the lower surface and surrounds the upper surface,
The backfilling step is a method of backfilling to a position higher than the upper surface and lower than the upper end of the earth retaining mold.

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