JP2017125322A - Base structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base structure in which a base beam successive over multi spans may be constructed without reduction in shearing resistance, a reasonable base construction having small fluctuation in strength and rigidity may be designed, and construction labor may be reduced.SOLUTION: A base structure 1 comprises a concrete column member 10, a precast concrete base beam member 30 and a concrete beam joint part 50. The column member 10 is arranged on subslab concrete 60 and main base beams 12, 13 project on side surface of the column member 10. Main base beams 31, 33 project on end surface of the base beam member 30 in longitudinal direction and joint parts 32, 34 are embedded in the other end surface of the base beam member 30 in longitudinal direction. The column member 10 and the base beam member 30 are jointed in a manner where the main base beams 12, 13 of the column member 10 are jointed with the main base beams 31, 33 of the base beam member 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a foundation structure of a building in which, for example, a precast concrete foundation beam is connected between column members.

Conventionally, as a foundation construction method of structures, precast concrete (PC) members are manufactured at the factory, and these PC members are brought into the field and joined together to construct the foundation. A method is known (Patent Document 1).
In this foundation construction method, for example, when providing a foundation beam between footings, as shown in FIG. 4 of Patent Document 1, the foundation beam is divided into a plurality of members, and horizontal holes are formed in each member. deep. When connecting each member, place each member in contact with each other, insert the PC steel material through the horizontal hole of each member, fix this PC steel material to the side of the footing with a fixing tool, and tension force Is introduced.

  Moreover, the following methods are known as a joining method of PC beam members. That is, for one of the PC beam members, a concave portion is formed on the end surface, and the beam main bar protrudes from the concave portion. For the other PC beam member, the end face is substantially vertical, and the beam main bar protrudes from the substantially vertical end face. When joining these PC beam members, the end surfaces of the PC beam members are brought into contact with each other, and the protruding beam main bars are joined in the recess (see Patent Document 2).

Japanese Patent No. 3443739 Japanese Patent No. 2009-138453

However, in the method of Patent Document 1, since it is necessary to provide a fixing tool on the side surface of the footing, the foundation beam cannot be continuously provided over a plurality of spans.
Moreover, in the method of Patent Document 2, since concrete is placed in the concave portion of the PC beam member by post-construction, a concrete joining surface is formed in the horizontal direction, and the shear strength of the foundation beam is reduced. There was a problem.

  The present invention makes it possible to construct a foundation beam continuous over a plurality of spans without reducing the shear strength, and to design a rational foundation frame with little variation in strength and rigidity. It is an object to provide a basic structure that can reduce the risk.

The basic structure of the first invention (for example, the below-described foundation structure 1) includes a concrete column member (for example, a column member 10, 10B, 20 described below) and a precast concrete foundation beam member (for example, a below-described column member). A foundation structure comprising a foundation beam member 30) and a concrete beam joint (for example, a later-described beam joint 50) constructed between the pillar member and the foundation beam member, The members are provided on a base (for example, abandoned concrete 60 and pressure platen 80 described later), and a first beam reinforcing bar (for example, a base beam lower main bar 12 and a base beam upper main bar described later) is provided on a side surface of the column member. 13) protrudes, and a second beam reinforcing bar (for example, a below-mentioned basic beam lower main bar 31 and a basic beam upper main bar 33, which will be described later) protrudes from one end face in the length direction of the base beam member. On the other end in the length direction In addition, a joint portion (for example, joint portions 32 and 34 described later) into which the second beam reinforcing bar can be inserted is embedded, and the column member and the base beam member include the first beam reinforcing bar of the column member. The second beam rebar of the foundation beam member is joint-joined at the beam joint, or the column member first beam reinforcement is inserted and joined to the joint of the foundation beam member. And
Here, examples of the base include abandoned concrete, a pressure-resistant board, and a rolled ground.

  According to the foundation structure of 1st invention, the vertical load of a structure can be reliably transmitted to a foundation by providing the foundation structure where the column member and the foundation beam member of the precast concrete were joined on the foundation. At the same time, the subsidence of the structure can be prevented by resisting the support pressure as a reaction against the pushing force exerted by the upper structure on the foundation structure when an earthquake occurs. In addition, by making the foundation beam member a precast concrete structure, a foundation structure with less variation in strength and rigidity can be formed, and the foundation structure can be efficiently constructed in a short construction period. In addition, the present invention can construct a foundation structure in which foundation beam members are continuously installed between pillar members over a plurality of spans, and a concrete joint surface is formed in the vertical direction between the pillar members and the foundation beam members. Since it joins via the made beam junction part, the fall of a shear strength can be suppressed.

  In the foundation structure of the second invention, a plurality of the foundation beam members are arranged between the adjacent column members, and the second beam reinforcing bar of one foundation beam member is joined to the joint portion of the other foundation beam member. It is characterized by being.

  According to the foundation structure of the second invention, by connecting a plurality of foundation beam members between pillar members, the length of one span is different in the building plan without limiting the arrangement position of the pillars. Even so, it can be constructed. In addition, since the base beam members are connected to each other by inserting the second beam rebar provided in the new foundation beam member into the joint of the already installed foundation beam member, Therefore, there is no interstitial concrete part placed on site, and a foundation beam with little variation in strength and rigidity of concrete can be realized.

  In the foundation structure of the third invention, at least a part of a lower end surface of the foundation beam member is provided on a positioning plate member (for example, a liner plate 61 described later) installed on the foundation. And

  According to the foundation structure of the third invention, since at least a part of the lower end surface of the foundation beam member is installed on the positioning plate member, there is no need to perform marking for each foundation beam member. Can be installed at a predetermined position with high accuracy in a short time. In addition, since the positioning plate material is small and lightweight, it is easy to handle, and the height can be adjusted on the foundation to be installed. Can be installed at a height.

  The basic structure of the fourth invention is characterized in that a column main bar (for example, a column main bar 11 described later) protrudes from the lower surface of the column member, and the column main bar is fixed to a pressure platen. .

According to the basic structure of the fourth invention, since the column member is firmly fixed to the pressure platen, the column member is rigidly joined to the pressure platen, and it is possible to suppress the floating deformation of the column member and the rotational deformation at the column base. . Also,
As the reaction pressure resists in the vertical direction against the pulling force acting on the column member, the column member can be prevented from being lifted.

  ADVANTAGE OF THE INVENTION According to this invention, there is little dispersion | variation in the intensity | strength and rigidity of concrete, and it can provide the foundation structure with which the foundation beam member was continuously connected between column members over multiple spans. Moreover, this basic structure can be efficiently constructed in a short construction period.

It is a fragmentary perspective view which shows the joining method of each member which comprises the basic structure which concerns on 1st Embodiment of this invention. It is a perspective view between 1 spans of the foundation structure concerning a 1st embodiment. It is a perspective view of the pillar member which constitutes the foundation structure concerning a 1st embodiment. It is a perspective view of the foundation beam member which constitutes the foundation structure concerning a 1st embodiment. It is a flowchart of the construction procedure between 1 span of the foundation structure which concerns on 1st Embodiment. It is explanatory drawing (the 1) of the construction procedure of the foundation structure which concerns on 1st Embodiment. It is explanatory drawing (the 2) of the construction procedure of the foundation structure which concerns on 1st Embodiment. It is explanatory drawing (the 3) of the construction procedure of the foundation structure which concerns on 1st Embodiment. It is a perspective view between 1 spans of the foundation structure concerning a 2nd embodiment of the present invention. It is a perspective view of a pillar member which constitutes a foundation structure concerning a 3rd embodiment of the present invention. It is a perspective view of a pillar member which constitutes a foundation structure concerning a modification of the present invention.

  In the present invention, as a foundation structure in which a column member and a foundation beam member are integrated, a concrete column member is provided on a foundation formed of abandoned concrete or a pressure platen, and a PC foundation is provided between the column members. A beam member is installed to connect the column member and the foundation beam member. The method of connecting the column member and the foundation beam member is to connect the reinforcing bars protruding from both sides with a reinforcing bar joint, and to construct a concrete beam joint by in-situ placement, and a concrete beam joint There is a method of connecting a reinforcing bar protruding from a column member to a joint portion embedded in a foundation beam member without providing a bar. Therefore, the foundation structure of the present invention is such that a concrete beam joint is provided on at least one end side, and the column member and the foundation beam member are connected.

  In the present invention, a positioning plate material that also serves as a level adjusting material is installed at predetermined intervals on the base, and a PC-made foundation beam member is placed on the upper end surface of the positioning plate material. A mortar was laid between the lower end surfaces of the members and the foundation structure of the present invention and the base were firmly joined.

  Specifically, in the first embodiment, a plurality of PC foundation beam members are installed between pillar members, and concrete beam joints are provided on the joint surfaces of both the column members and the foundation beam members. The foundation structure is firmly connected to each other. In the second embodiment, a concrete beam joint is provided only at the joint on one end side of the column member and the foundation beam member, and the beam reinforcing bars protruding from the column member and the foundation beam member are joint-joined. The joint portion on the other end side is a foundation structure joined by inserting the first beam reinforcing bar protruding from the column member into the reinforcing bar joint embedded in the foundation beam member.

  Further, the third embodiment is a foundation structure in which a foundation beam member made of PC is joined to a foundation footing in which a column section is widened only on the lower end side of the column member. As a modification, there is a foundation structure in which column main bars protruding from the lowermost surface of the column member are fixed to the foundation board. Hereinafter, the configuration of each embodiment and the function and effect thereof will be described.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a partial perspective view showing a method for joining members constituting the foundation structure 1 according to the first embodiment of the present invention. In FIG. 1, the display of a concrete body placed on site for a later-described beam joint 50 is omitted.

The foundation structure 1 includes a plurality of columns 2, 3, and 4 provided on a discarded concrete 60 as a foundation, and foundation beams 5 and 6 that are provided on the discarded concrete 60 and connect the columns 2 to 4. Prepare.
The column 2 is a reinforced concrete structure (RC structure), and is constructed by joining a precast concrete column member 10A on a precast concrete column member 10.

The column 3 is a steel reinforced concrete structure (SRC structure), and is constructed by joining a steel member (not shown) on a precast concrete column member 10 and placing a concrete body around the steel member.
The pillar 4 is a steel structure (S structure), and is constructed by joining a steel member (not shown) on a precast concrete pillar member 20.

  The foundation beam 5 is provided between the column members 10 and is connected to a plurality of precast concrete foundation beam members 30 and 40 connected in the horizontal direction, and the foundation beam members 30 and 40 and the column members 10 and 20. And a beam joint 50 constructed in the field. Moreover, the through-hole 7 is suitably formed in the foundation beam members 30 and 40. FIG.

  The foundation beam 6 is provided between the column members 10 and 20 and has the same configuration as the foundation beam 5. The height of the upper surface of the foundation beam 6 is substantially equal to the height of the upper surface of the foundation beam 5, but the beam of the foundation beam 6 is lower than that of the foundation beam 5.

The above columns 2 to 4 and the foundation beams 5 and 6 are joined to the discarded concrete 60. In addition, the height of the discarded concrete 60 to which the columns 2 and 3 and the foundation beam 5 are joined is lower than the height of the discarded concrete 60 to which the columns 4 and the foundation beam 6 are joined.
Thus, when the beam of the foundation beam 6 can be made lower than the beam of the adjacent foundation beam 5, the excavation depth is made shallower, and a concrete 60 or a pressure platen is disposed on the bottom of the shallow excavation space. By forming the base, the number of excavation days is shortened, so that excavation costs can be reduced.

FIG. 2 is a perspective view of one span of the base structure 1.
Hereinafter, as an example, one span of the foundation structure 1 will be described. In this basic structure 1, a pair of column members 10 are arranged. A column member 10A is joined on the left column member 10 in FIG.
Between the pair of column members 10, a floor mortar 62 is placed, and the foundation beam members 30 and 40 are arranged side by side on the floor mortar 62. Here, a plurality of foundation beam members 30 are arranged in a straight line, and the foundation beam member 40 is arranged on one end side of these foundation beam members 30.

FIG. 3A is a perspective view of the column member 10.
The column member 10 is made of reinforced concrete, has a rectangular horizontal cross section, and extends in the vertical direction. The column member 10 includes a column main reinforcement 11, a band reinforcement (not shown) wound around the column main reinforcement 11, a base beam lower main reinforcement 12 as a first beam reinforcement, and a foundation beam upper main reinforcement as a first beam reinforcement. 13 and anchor bolts 14 are embedded.

The column main reinforcement 11 protrudes upward from the upper end surface of the column member 10. The base beam lower main reinforcement 12 protrudes in the horizontal direction from the lower side of the side surface of the column member 10, and the foundation beam upper main reinforcement 13 protrudes in the horizontal direction from the upper side of the side surface of the column member 10. The anchor bolt 14 projects from the upper end surface of the column member 10 and from the inside of the column main reinforcement 11.
Further, by attaching a lifting jig to the anchor bolt 14 and lifting the column member 10 through the lifting jig, the column main reinforcement 11, the foundation beam lower main reinforcement 12, or the column member 10 main body is damaged. The column member 10 can be easily installed at a predetermined position.

FIG. 3B is a perspective view of the column member 10A.
The column member 10A has the same configuration as the column member 10, but the base beam lower main bar 12 and the base beam upper main bar 13 are not provided, and the column main bar of the column member 10 is provided on the lower end surface of the column member 10A. 11 differs from the column member 10 in that a joint portion 15 is inserted and joined.

  The column member 20 is different from the column member 10 in that the column main reinforcement 11 does not protrude upward from the upper end surface of the column member 10, and the other configuration is the same as that of the column member 10 (see FIG. 1).

FIG. 4A is a perspective view of the foundation beam member 30, and FIG. 4B is a perspective view of the foundation beam member 40.
The foundation beam member 30 is made of reinforced concrete and has a rectangular parallelepiped shape. The foundation beam member 30 includes a foundation beam lower main reinforcement 31 as a second beam reinforcement, a joint portion 32 to which the foundation beam lower reinforcement 31 is joined, a foundation beam upper reinforcement 33 as a second beam reinforcement, A joint portion 34 to which the beam upper main bar 33 is joined, and a rib 35 wound around the base beam main bars 31 and 33 are embedded.

The foundation beam lower main reinforcement 31 protrudes horizontally from the lower side of one end face in the length direction of the foundation beam member 30, and the foundation beam upper main reinforcement 33 is horizontal from the upper side of one end face in the length direction of the foundation beam member 30. Protrudes in the direction.
The stirrup 35 is exposed from the upper end surface of the foundation beam member 30.

  The joint parts 32 and 34 are cylindrical, and the basic beam main bars 31 and 33 are inserted and joined to one end side. The other end surfaces of the joint portions 32 and 34 are exposed at the other end surface in the length direction of the foundation beam member 30, and the foundation beam main bars 31 and 33 of the adjacent foundation beam members 30 and 40 can be inserted and joined. It has become.

  The foundation beam member 40 is different from the foundation beam member 30 in that the joint portion is not embedded and the foundation beam main bars 31 and 33 are extended and project from the other end surface of the foundation beam member 40. It is the same as the foundation beam member 30.

  In this manner, the foundation beam member 30 has the foundation beam main bars 31 and 33 that are the second beam reinforcing bars projecting from the beam end that is one end face, and the joint parts 32 and 34 are embedded in the other end face. Yes. Further, in the foundation beam member 40, foundation beam main bars 31 and 33 that are second beam reinforcing bars protrude from beam ends that are both end faces. Moreover, as shown in FIG. 1, the base structure 1 can join the member made from PC to each side surface from the one side surface of the pillar member 10 to four side surfaces. Therefore, the foundation structure 1 of the present invention is a foundation beam structure including the column member 10 in which the PC members are continuously connected between the column members 10 over a plurality of spans.

Returning to FIG. 2, in the beam joint portion 50, the foundation beam principal bars 12 and 13 of the column member 10 and the foundation beam principal bars 31 and 33 of the foundation beam members 30 and 40 are joined using a cylindrical mechanical joint 51. Has been.
Specifically, the foundation beam main bars 12 and 13 of the column member 10 are inserted into one end side of the mechanical joint 51, and the foundation beam main bars 12 and 13 are joined to the mechanical joint 51. Further, the foundation beam main bars 31 and 33 of the foundation beam members 30 and 40 are inserted into the other end side of the mechanical joint 51, and the foundation beam principal bars 31 and 33 are joined to the mechanical joint 51.

The procedure for constructing one span of the basic structure 1 will be described below with reference to the flowchart of FIG.
In step S1, as shown in FIG. 6, the discarded concrete 60 is placed on the excavated bottom surface (root cutting bottom), and the column member 10 and the foundation beam members 30 and 40 are positioned on the discarded concrete 60 (black ink). Take out).

  In step S2, as shown in FIG. 6, plate-like liner plates 61 are attached on the discarded concrete 60 and at the corners of the four corners of the column member 10 and the foundation beam members 30, 40. At this time, the height position of the liner plate 61 is adjusted so that the upper surface of the liner plate 61 becomes the height of the lower end surfaces of the column member 10 and the foundation beam members 30 and 40.

In step S3, as shown in FIG. 6, the mortar 62 is laid on the discarded concrete 60 and immediately below the column member 10 and the foundation beam members 30 and 40. At this time, the height of the upper surface of the mortar 62 is set to be the height of the upper surface of the liner plate 61.
In step S4, the column member 10 is installed as shown in FIG. Specifically, the column member 10 is lifted by a lifting machine (not shown) and is suspended and placed on the liner plate 61 and the mortar 62.

In step S5, the foundation beam member 30 closest to the column member 10 is installed as shown in FIG.
Specifically, the foundation beam member 30 is lifted by a lifting machine (not shown) and suspended on the liner plate 61 and the mortar 62 and at a position away from the original installation position.

  Next, the foundation beam member 30 is moved closer to the column member 10 by sliding in the direction indicated by the arrow in FIG. Then, the basic beam main bars 31 and 33 of the base beam member 30 are joined to the basic beam main bars 12 and 13 of the column member 10 using the mechanical joint 51 (see FIGS. 2 and 8).

  In step S6, as shown in FIG. 8, the foundation beam member 30 adjacent to the already installed foundation beam member 30 is installed. Specifically, the foundation beam member 30 is lifted by a lifting machine (not shown) and suspended on the liner plate 61 and the mortar 62 and at a position away from the original installation position.

Next, the base beam member 30 is slid in the direction indicated by the arrow in FIG. And the basic beam principal reinforcements 31 and 33 of the foundation beam member 30 installed this time are inserted and joined to the joint portions 32 and 34 of the foundation beam member 30 already installed.
In step S7, the remaining foundation beam members 30 and 40 are installed in the same procedure as in step S6, and the column member 10 is installed in the same procedure as in step S5.

  In step S <b> 8, a concrete beam joint 50 is constructed between the column members 10 and the foundation beam members 30 and 40 by on-site placement. That is, stirrups (not shown) are attached to the foundation beam main bars 12 and 13 of the column member 10 and the foundation beam main bars 31 and 33 of the foundation beam members 30 and 40, and then a side formwork is built and concrete is placed. To do.

In this construction method, as shown in step S4 to step S7, one of the pair of column members 10 is installed on the discarded concrete 60 as the base, and is installed later from one side of the one column member 10. The foundation beam members 30 are sequentially installed toward the other column member 10 and joined to each other. According to this construction method, by installing one column member 10 in advance, the beam joint 50 provided between the column member 10 and the foundation beam member 30 accumulates with the installation of each foundation beam member 30. The amount of misalignment can be easily absorbed.
However, another construction method of the foundation structure may be a construction procedure in which adjacent column members are installed in advance and then a foundation beam member is installed between the column members. According to this construction method, the foundation structure can be constructed at a predetermined position with high accuracy by adjusting the positional deviation amount of the foundation beam member for each span of the adjacent column members.

According to this embodiment, there are the following effects.
(1) By discarding the foundation structure 1 in which the column members 10 and 20 and the foundation beam members 30 and 40 are joined and disposing them on the concrete 60, the stress acting on the foundation structure 1 and the deformation that occurs in the foundation structure 1 can be assured. Can be transmitted to the discarded concrete 60 which is a base. In addition, by producing the column members 10 and 20 and the foundation beam members 30 and 40, which are precast concrete members, in the PC factory, it is possible to form the foundation structure 1 with less variation in the strength and rigidity of the concrete, and the foundation in a short construction period. It can be constructed efficiently.

  (2) The foundation structure 1 can cope with a case where the length of one span is different by appropriately adjusting the number of combinations of the plurality of foundation beam members 30 and 40 between the column members 10.

[Second Embodiment]
FIG. 9 is a perspective view of one span of the foundation structure 1A according to the second embodiment of the present invention.
This embodiment is different from the first embodiment in that only one beam joint 50 of the foundation beam 5A is provided.

That is, in the foundation beam 5 </ b> A, the foundation beam member 30 is provided instead of the foundation beam member 40. The foundation beam member 30 is in contact with the other column member 10 (the column member 10 on the right side in FIG. 9), and the joint portions 32 and 34 of the foundation beam member 30 are connected to the foundation beam main reinforcement 12 of the column member 10, 13 is inserted and joined.
According to the present embodiment, there are the same effects as the above (1) and (2).

[Third Embodiment]
FIG. 10 is a perspective view of the column member 10B of the foundation structure 1B according to the third embodiment of the present invention.
This embodiment is different from the first embodiment in that a foundation footing 15 is provided on the lower end side of the column member 10B.
That is, the foundation footing 15 is made of reinforced concrete and is provided along the outer periphery of the column member 10B. The foundation beam lower main reinforcement 12 protrudes in the horizontal direction from the lower side of each side surface of the foundation footing 15, and the foundation beam upper main reinforcement 13 projects in the horizontal direction from the upper side of each side surface of the foundation footing 15. The foundation beam 5 is joined to each side surface of the foundation footing 15.

Moreover, the pile 70 is joined to the lower surface of this column member 10B.
The pile 70 is a reinforced concrete structure, and the pile rebar 71 protrudes upward from the pile head of the pile 70. On the lower surface of the column member 10 </ b> B, a concave portion 16 into which a pile head of the pile 70 is fitted and a hole portion 17 into which the pile reinforcing bar 71 of the pile 70 is inserted are formed.

According to the present embodiment, in addition to the above (1) and (2), there are the following effects.
(3) Since the foundation footing 15 is provided on the outer periphery of the column member 10 and the foundation footing 15 is firmly joined to the pile head of the pile 70 via the recess 16, the stress acting on the foundation structure 1 is applied to the foundation structure 1. It can be reliably transmitted to the ground directly below.

[Modification]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in each of the above-described embodiments, the discarded concrete 60 is placed on the excavated bottom surface (root cutting bottom), and the column member 10 and the foundation beam members 30 and 40 are installed on the discarded concrete. Not limited to this, as shown in FIG. 11, a pressure platen 80 as a base may be provided, and a column member or a foundation beam member may be installed on the pressure platen 80.

  In this case, the column main reinforcement 11 of the column member 10 may be fixed to the pressure-resistant panel 80 by protruding the column main reinforcement 11 of the column member 10 downward from the bottom surface and attaching the fixing plate 18 to the lower end of the column main reinforcement 11. . In this way, since the column member 10 is firmly fixed to the pressure platen 80, it is possible to sufficiently resist the pulling force acting on the column member 10.

  Further, in each of the above-described embodiments, after the liner plate 61 is attached and the mortar 62 is secured or applied horizontally with a predetermined coating thickness, the liner plate 61 and the mortar 62 are placed on the liner plate 61 and the mortar 62. In addition, although the column member 10 and the foundation beam members 30 and 40 are installed, the present invention is not limited thereto. That is, after the liner plate 61 is attached, the column member 10 and the foundation beam members 30 and 40 are installed on the liner plate 61, and thereafter, in the gap between the discarded concrete 60 and the column member 10 and the foundation beam members 30 and 40. Mortar may be filled.

  Moreover, in each above-mentioned embodiment, in parts other than the junction part of the column member 10 and the foundation beam members 30 and 40, ie, the intermediate part of the foundation beams 5, 5A, 6, the PC foundation beam members 30 and 40 are connected to each other. Although the foundation beams 5, 5A, 6 are formed by direct connection, the present invention is not limited to this, and depending on the building construction method, a concrete beam joint is provided between the PC foundation beam members. You may connect the PC base beam members of the both sides which pinched | interposed the junction part.

Moreover, in each embodiment, the foundation beams 5 and 6 are closely contacted on the base of the discarded concrete 60 via the liner plate 61 and the mortar 62, so that the vertical load of the structure can be smoothly transmitted to the base. Can do.
Further, in each of the above-described embodiments, the columns 2 to 4 are made of PC. Since the concrete pillars placed on site can be placed concrete after the foundation beams 5 and 6 are installed, the foundation beams 31 and 33 can be used without using fixing hardware. It can be firmly fixed in the pillar.

DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Foundation structure 2, 3, 4 ... Column 5, 5A, 6 ... Foundation beam 7 ... Human through hole 10, 10A, 10B, 20 ... Column member 11 ... Column main reinforcement 12 ... Foundation beam lower main reinforcement ( (First beam reinforcing bar) 13 ... foundation beam upper main reinforcing bar (first beam reinforcing bar) 14 ... anchor bolt 15 ... foundation footing 16 ... recess 17 ... hole 18 ... fixing plate 30, 40 ... foundation beam member 31 ... below foundation beam Side main bars (second beam reinforcing bars) 32 ... Joint part 33 ... Foundation beam upper main bar (second beam reinforcing bar) 34 ... Joint part 35 ... Stirrup 50 ... Beam joint 51 ... Mechanical joint 60 ... Discarded concrete (base 61 ... Liner plate (positioning plate material) 62 ... laying mortar 63 ... mechanical joint 70 ... pile 71 ... pile rebar 80 ... pressure platen (base)

Claims (4)

A foundation structure comprising a concrete column member, a precast concrete foundation beam member, and a concrete beam joint constructed between the column member and the foundation beam member,
The column member is provided on a base, and a first beam reinforcing bar protrudes from a side surface of the column member,
A second beam rebar protrudes from one end surface in the length direction of the foundation beam member, and a joint portion into which the second beam rebar can be inserted is embedded in the other end surface in the length direction of the foundation beam member. ,
The column member and the foundation beam member may be formed by joining a first beam reinforcing bar of the column member to a second beam reinforcing bar of the foundation beam member at the beam joint, or A foundation structure, wherein one beam rebar is inserted and joined to a joint portion of the foundation beam member.   A plurality of the foundation beam members are arranged between the column members adjacent to each other, and the second beam reinforcement of one foundation beam member is joined to the joint portion of the other foundation beam member. Item 1. The basic structure according to Item 1.   The foundation structure according to claim 1 or 2, wherein at least a part of a lower end surface of the foundation beam member is provided on a positioning plate member installed on the foundation. Column main bars protrude from the lower surface of the column member,
The foundation structure according to any one of claims 1 to 3, wherein the column main reinforcement is fixed to a pressure-resistant panel.

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