JP3392303B2 - PC foundation beam structure - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a precast concrete foundation beam member (hereinafter referred to as a PC foundation beam member) produced by a factory on a rectangular plate-shaped foundation plate continuously laid horizontally on the ground. The present invention relates to a PC foundation beam structure used for a foundation portion of a cloth foundation structure of a building such as a house or an office, which is erected so that its bottom side substantially coincides with the center line of the rectangle in the longitudinal direction.

[0002]

2. Description of the Related Art In recent years, cast-in-place concrete has been reduced as much as possible by using a factory-produced PC foundation beam member for the foundation portion of a cloth foundation structure of a building such as a house or an office to shorten the construction period and the member The PC foundation beam structure with improved reliability is widely adopted. As an example, JP-A-48-32309
7 and 8 show a cloth foundation using a PC foundation beam member described in Japanese Patent Publication No.
Shown in. 7 is a perspective view of this cloth foundation, and FIG. 8 is a cross-sectional view.
91 is a PC foundation beam member, 92 is a foundation plate made of precast concrete, and S is sand. In this cloth foundation, first, the ground surface is excavated to the support layer, sand S is laid horizontally, and leveled on top of it.
Are laid horizontally while adjoining, and a rectangular parallelepiped P
The C foundation beam member 91 is arranged in a vertical posture (hereinafter referred to as a vertical direction), and the soil is filled up to the line indicated by GL.

As means for connecting adjacent PC foundation beam members to each other, joints having pin holes are provided at both ends of the tensile reinforcing bars horizontally embedded in the PC foundation beam members, and pins are driven into the joints for joining. PC is generally used
It is also possible to embed a metal piece connected to the tensile rebar in the end portion of the foundation beam member to form a bolt hole in the metal article and to connect the bolt holes of the adjacent PC foundation beams with a plate.

On the other hand, the PC foundation beam member is generally simply placed on the foundation plate and is stable due to its own weight and the frictional force due to the weight of the building constructed above it.
When a large horizontal force or moment such as an earthquake, or uplift is expected, there is a problem that it cannot be sufficiently counteracted.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a PC foundation beam member and a foundation plate are integrally connected to each other so that they will not be displaced or lifted up even when strong vibration, horizontal force, moment, etc. are applied. The purpose is to realize a PC foundation beam structure.

[0006]

According to the present invention as set forth in claim 1, a rectangular plate-shaped foundation plate continuously laid horizontally on the ground is used to form a rectangular long side as a base and a short side as a base. A rectangular parallelepiped PC base beam member having a height equal to or less than the short side is oriented vertically so that the bottom side of the PC base beam member is substantially aligned with the longitudinal center line of the rectangle in the foundation plate. In the PC basic beam structure, which is mounted on the PC basic beam member, and adjacent PC basic beam members are appropriately connected in the longitudinal direction in the vicinity of the short side, a locking groove is formed on the surface of the PC basic beam member near the bottom side in parallel with the bottom side. And forming a protruding portion that is higher than the surface of the portion of the foundation plate on which the PC base beam member is mounted on the outside of the portion of the surface of the foundation plate on which the PC base beam member is mounted. Provided, the side of this protrusion facing the PC foundation beam member Forming a horizontal locking groove substantially the height facing the locking groove as a vertical wall shape, the P
C A rod-shaped body is inserted into a space defined by a locking groove formed near the bottom of the base beam member and a locking groove formed in the protruding portion of the foundation plate, and the PC base beam member and the This is a PC foundation beam structure characterized by being integrally joined to a foundation plate.

According to a second aspect of the present invention, in the PC foundation beam structure according to the first aspect, a locking groove formed near the bottom side of the PC foundation beam member and a protrusion of the foundation plate. A PC basic beam structure, characterized in that a rod-shaped body is inserted between the locking groove formed in the above, and a grout material is injected around the groove to integrally connect the PC basic beam member and the basic plate. Is.

Further, according to the present invention as set forth in claim 3, on a rectangular plate-shaped foundation plate continuously laid horizontally on the ground, the long side of the rectangle is the bottom side and the short side is the height. A rectangular parallelepiped PC foundation beam member having a thickness equal to or less than the short side is placed vertically so that the bottom side of the PC foundation beam member substantially coincides with the longitudinal center line of the rectangle in the foundation plate. In a PC foundation beam structure in which adjacent PC foundation beam members are appropriately connected in the longitudinal direction near the short side, a locking groove is formed parallel to the bottom side on the surface near the bottom side of the PC foundation beam member. Providing a protruding portion, which is higher than the surface of the portion of the foundation plate on which the PC base beam member is mounted, on the outside of the portion of the surface of the foundation plate on which the PC base beam member is mounted, and this protrusion The side facing the PC foundation beam member is almost vertical A horizontal locking groove is formed as a wall shape at a height facing the locking groove, and is formed in the locking groove formed near the bottom of the PC foundation beam member and the protruding portion of the foundation plate. The PC foundation beam structure is characterized in that a grout material is injected into a space formed by the locking groove to integrally join the PC foundation beam member and the foundation plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the drawings. FIG. 1 is a front view showing an example of a PC foundation beam member according to the present invention, 1 is a PC foundation beam member, 11 is a bolt hole provided at an end for horizontal connection, 12 is a surface near the bottom side, and the bottom side is It is a locking groove formed in parallel with.

As shown in FIG. 1, this PC foundation beam member is a rectangular parallelepiped having a rectangular long side as a base and a short side as a height, and having a thickness equal to or less than the short side, not shown, on both sides. The horizontal reinforcements that connect the bolt holes of the above are appropriately arranged. To give an example of dimensions, in Fig. 1, the left and right length is 900 mm or 1800 mm, and the vertical height is 600 m
m, the thickness is 120 mm or 150 mm.

The locking groove 12 in FIG. 1 has bolt holes at both ends.
Although it is stopped before 11, it may be continuous up to the end or, conversely, may be formed intermittently only in the necessary portion. 2 is a plan view showing an example of a foundation plate, FIG. 3 is a perspective view showing a part thereof, 2 is a foundation plate, 21 is a protruding portion, 22 is a protruding portion.
An engaging groove formed on the side surface of 21 and a depression 23. Foundation plate
On the surface of 2a, near the center line in the longitudinal direction, the PC foundation beam member 1 shown by an imaginary line in FIG. 2 is placed vertically so that the center lines substantially match. And outside the part to be placed,
A protrusion 21 is provided that is higher than the surface of the portion to be placed.

The side of the protruding portion 21 facing the PC base beam member 1 has a substantially vertical wall shape, and a horizontal locking groove 22 is formed at a height facing the locking groove 12 of the PC base beam member 1. Are formed. Although not shown, the flat plate portion and the projecting portion of the foundation plate 2 are appropriately reinforced. In addition, although the shape is different from that of FIG.
It is also possible to form only the portion of the foundation plate 2 on which the PC foundation beam member 1 is placed in a groove shape, and form the outside thereof at the same height (thickness) as the protruding portion 21.

FIG. 4 is a partial cross-sectional view showing a state where the PC foundation beam member 1 is placed on the foundation plate 2, and FIG. 5 is a partial cross-sectional view showing only the portion indicated by the symbol B in FIG. As shown by the portion A in FIG. 4, the locking groove 12 formed on the surface near the bottom of the PC foundation beam member 1 and the locking groove formed on the inner wall surface of the projecting portion 21 of the foundation plate 2 Since a space is formed so as to face the groove 22, the rod-shaped body 3 is inserted into this space by inserting the rod-shaped body 3 by a means such as driving as shown by the reference numeral B.
The PC foundation beam member 1 and the foundation plate 2 are integrally connected as a wedge.

The cross-sectional shape of the rod-shaped body 3 may be a polygon (a), a rectangle (b), a circle (c), etc., which can be inserted into this space, as shown in FIG. Also, the material of the rod-shaped body,
Any material having wedge strength, such as concrete, metal, or resin, may be used. Further, in order to prevent looseness in the coupled state and to prevent the rod-shaped body 3 from coming out, it is also effective to use a rod-shaped body having a little elasticity such as hard rubber or resin, or to provide a taper in the cross section. is there.

Further, after the rod-shaped body 3 is inserted, as shown by B in FIG. 4, a grout material 31 such as mortar or cement paste is injected into the periphery of the rod-shaped body 3 to fill the space and the gaps around the periphery, and hardened to bond them. Strengthening is also effective. FIG. 6 is a partial cross-sectional view showing another example of the portion corresponding to part B of FIG. 4, and there is no particular difference in the configurations of the PC foundation beam member 1 and the foundation slab 2. In this example, instead of preparing the rod-shaped body 3, as shown in FIG. 6, the locking groove 12 formed on the surface near the bottom of the PC foundation beam member 1 and the inner wall surface of the protrusion 21 of the foundation plate 2 are formed. The grouting material 31 such as mortar is directly injected into the space formed so as to face the formed locking groove 22 to fill the clearance in the space at the same time as the surrounding space and harden it to cure the PC base beam member 1 and the foundation. The plate 2 is integrally connected.

If a recess 23 having an appropriate shape as illustrated in FIG. 3 is provided in the portion of the foundation plate 2 on which the PC foundation beam member 1 is placed, a tool such as a burl is applied to this corner. It is convenient because the position of the PC foundation beam member 1 can be adjusted, and when the bottom side of the recess 23 is inclined toward the center line as shown in FIG. 4, both sides of the PC foundation beam member 1 are connected. It is convenient because the grout material 31 flows well and spreads well.

In the present invention, the work procedure before and after the excavation of the ground, backfilling, etc. is the same as the conventional one. In addition,
It is preferable that the seams of the PC foundation beam member 1 and the seams of the foundation slab 2 are appropriately displaced, as in the conventional example shown in FIG. 7.

[0018]

According to the present invention, since the PC foundation beam member and the foundation plate are integrally connected by the rod-shaped body or the grout material, the displacement and the uplift may occur due to strong vibration, horizontal force, moment, etc. It has the excellent effect of realizing a stable PC foundation beam structure.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a PC foundation beam member of the present invention.

FIG. 2 is a plan view showing an example of a foundation plate of the present invention.

FIG. 3 is a perspective view showing a part of the foundation plate of the present invention.

FIG. 4 is a partial cross-sectional view showing a state in which a PC foundation beam member is placed on the foundation plate of the present invention.

5 is a partial cross-sectional view of an essential part showing a B part in FIG. 4. FIG.

FIG. 6 is a partial cross-sectional view showing another example of the main part corresponding to part B of FIG.

FIG. 7 is a perspective view of a cloth foundation showing a conventional technique.

FIG. 8 is a sectional view of a cloth foundation showing a conventional technique.

[Explanation of symbols]

1 PC foundation beam members 2 foundation 3 Rods 11 bolt holes 12 Locking groove 21 Projection 22 Locking groove 23 depression 31 grout 91 PC foundation beam members 92 Foundation S sand

Claims (3)

(57) [Claims] 1. A rectangular plate-shaped foundation plate (2) laid continuously in the horizontal direction on the ground, with the long side of the rectangle as the bottom side,
A rectangular parallelepiped PC base beam member (1) having a short side as a height and a thickness equal to or less than the short side is used, and the bottom side of the PC base beam member (1) is rectangular in the foundation plate (2). Place it vertically so that it is approximately aligned with the longitudinal centerline,
In a PC foundation beam structure in which adjacent PC foundation beam members (1) are appropriately connected in the longitudinal direction near the short side,
A locking groove (12) is formed on the surface of the base beam member (1) near the bottom side in parallel with the bottom side, and the base plate member (1) is provided with a locking groove (12) more than the portion where the PC base beam member is placed. On the outside, a protrusion (21) is provided that is higher than the surface of the portion of the foundation plate (2) on which the PC foundation beam member (1) is placed,
The side of the protrusion (21) facing the PC base beam member is formed into a substantially vertical wall shape, and a horizontal locking groove (22) is formed at a height facing the locking groove. A rod-shaped body (3) is provided in a space formed by a locking groove (12) formed near the bottom side of the foundation beam member (1) and a locking groove (22) formed in the protrusion of the foundation plate. A PC foundation beam structure, characterized in that the PC foundation beam member (1) and the foundation plate (2) are integrally connected by inserting. 2. The PC foundation beam structure according to claim 1, wherein a locking groove (12) formed near the bottom side of the PC foundation beam member (1) and a protrusion formed on the foundation plate. The rod-shaped body (3) is inserted between the groove (22) for stopping, and the grout material (31) is injected around the rod-shaped body (3) to integrally integrate the PC foundation beam member (1) and the foundation plate (2). PC characterized by being combined
Foundation beam structure. 3. A rectangular plate-shaped foundation plate (2) laid continuously in the horizontal direction on the ground, with the long side of the rectangle as the bottom side,
A rectangular parallelepiped PC base beam member (1) having a short side as a height and a thickness equal to or less than the short side is used, and the bottom side of the PC base beam member (1) is rectangular in the foundation plate (2). Place it vertically so that it is approximately aligned with the longitudinal centerline,
In a PC foundation beam structure in which adjacent PC foundation beam members (1) are appropriately connected in the longitudinal direction near the short side,
A locking groove (12) is formed on the surface of the base beam member (1) near the bottom side in parallel with the bottom side, and the base plate member (1) is provided with a locking groove (12) more than the portion where the PC base beam member is placed. On the outside, a protrusion (21) is provided that is higher than the surface of the portion of the foundation plate (2) on which the PC foundation beam member (1) is placed,
The side of the protrusion (21) facing the PC base beam member is formed into a substantially vertical wall shape, and a horizontal locking groove (22) is formed at a height facing the locking groove. The grout material (31) is placed in the space defined by the locking groove (12) formed near the bottom of the foundation beam member (1) and the locking groove (22) formed in the projecting portion of the foundation plate. A PC foundation beam structure, characterized in that the PC foundation beam member (1) and the foundation plate (2) are integrally bonded by injecting.