JPH09287152A - Pc footing beam member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit mortar from a joint and facilitate demolition works and reuse of materials, by arranging loop reinforcements at the inside separated by a specified covering depth of concrete in parallel with the outer periphery of a rectangular form and connecting embedding metal tools in the inside of respective corners of the loop reinforcements. SOLUTION: In a rectangular parallelepiped PC footing beam member, the longer sides of the rectangular form are arranged as the bottom and the shorter sides thereof are arranged as the vertical sides. And a loop reinforcement 3 is arranged at the center in the thickness direction, at the inside separated by the distance corresponding to a covering depth of concrete. Embedding metal blocks 1 are welded horizontally with the inside of the corners of the loop reinforcement 3. And bolt holes are formed in the metal blocks 1 to fix a connecting metal block with a screw. Subsequently, stirrups 4 are arranged at the inside of the loop reinforcements 3 and the connecting metal blocks are set on the adjacent PC footing beam member and a bolt is inserted in the metal block 1 and fastened. In this way, mortar is not required in the joint and hence, demolition works and reuse processes become simple. Construction works can be executed through four seasons.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a factory-produced precast concrete foundation beam member (hereinafter referred to as PC foundation beam member) used for a foundation portion of a cloth foundation structure of a building such as a house or an office.

[0002]

2. Description of the Related Art In recent years, cast-in-place concrete has been minimized by using PC foundation beam members produced in factories in the foundation portion of the cloth foundation structure of buildings such as houses and offices, and the construction period has been shortened and reliability has been improved. It is widely practiced to improve the strength by using a member having high properties.

As an example, FIGS. 22 and 23 show a cloth foundation using a PC foundation beam member disclosed in Japanese Patent Laid-Open No. 48-32309. Fig. 22
Is a perspective view of this cloth foundation, FIG. 23 is a sectional view, P is a PC foundation beam member, B is a precast concrete plate (hereinafter referred to as PC plate), and S is sand. This cloth foundation is constructed by first excavating the ground surface to a support layer, laying sand S horizontally, and laying it horizontally with a precast concrete plate B of a constant cross section adjoining it, and then a rectangular parallelepiped PC foundation. The beam member P is arranged in a vertical posture.

As a 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 embedded in the PC foundation beam members in the horizontal direction, and pins are driven into the joints for joining. Is common. An example thereof will be described with reference to FIGS. 24 to 26. FIG. 24 is a front view showing a PC joint beam member of a pin joint system, FIG. 25 is a plan view of the same, and 91 is a tensile rebar, 92 is one of the joint receivers, and 93 is also a joint.

These joints protrude from a vertical groove formed in the vertical direction at the center of the end face of the PC foundation beam member,
One is a receiver with two steel plates with pin holes
92, and the other has a similar shape and is one piece of the difference 93. FIG. 26 is a horizontal sectional view of the PC foundation beam member connection portion showing the connected state, and 94 is a pin. Between the two steel plates of the recipient 92, the difference 93
By inserting the pin 94 into the pin hole in a state in which is inserted, adjacent PC foundation beam members are coupled.

If the pin is just driven, the pin may fall off when horizontal force such as an earthquake is applied after the construction. Therefore, it is possible to semi-permanently fix the joint part by filling the space of the connection part with mortar. is necessary. 95 is a blocking board for mortar. In this way, the conventional PC foundation beam members are connected with pin joints and fixed with mortar, so in buildings such as temporary housing and construction offices that are dismantled for a certain period of time, the mortar is destroyed during dismantling. There is a problem that it takes time to do. In addition, since mortar does not harden due to freezing in cold regions, there is a problem that foundation work cannot be performed in winter.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to realize a PC foundation beam member which eliminates mortar from a joint portion, is easy to disassemble and reuse, and can be constructed throughout the four seasons even in cold regions.

[0008]

According to a first aspect of the present invention, there is provided a rectangular PC base having a rectangular long side as a bottom, a short side as a height, and a thickness equal to or shorter than the short side. A beam member, which is parallel to the outer periphery of the rectangle and is separated by at least a predetermined concrete cover thickness, and one or two rectangular shapes are also formed in the thickness direction by at least a predetermined concrete cover thickness. Bar shape having the loop streaks arranged therein, having a length equal to the thickness of the PC base beam member in the thickness direction inside each corner of the loop streaks, and having bolt holes for screwing the connection fittings It is a PC foundation beam member characterized by joining an embedded metal article made of a body.

According to a second aspect of the present invention, in addition to the inside of each corner portion of the rectangular loop line, one or two of the PC foundation beam members are provided inside the substantially central portion in the height direction. The PC foundation beam member according to claim 1, wherein an embedded metal member having a length equal to the thickness and having a rod hole having a bolt hole for screwing the connection fitting is joined. The present invention according to claim 3 is the PC according to claim 1 or 2, wherein a horizontal rib is formed toward the inside of the rectangle in the embedded metal that is joined to the inside of each corner of the rectangular loop line. It is a foundation beam member.

According to a fourth aspect of the present invention, there is provided the PC foundation beam member according to any one of the first to third aspects, in which a mesh body made of a lattice-shaped reinforcing bar is attached to the inside of the rectangular loop bar. The present invention according to claim 5 provides a rectangular parallelepiped P
The PC foundation beam member according to any one of claims 1 to 4, wherein a corner metal member made of a thin steel plate having a U-shaped cross section is attached to a surface of the C foundation beam member near the short side.

According to a sixth aspect of the present invention, a plurality of PC base beam members according to any one of the first to fifth aspects or a plurality of PC base beam members each having a length substantially half the right angle are formed at short side portions. It is a PC foundation beam member formed by joining to.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings. Embodiment 1 FIG. 1 is a front view showing a first embodiment of a PC foundation beam member of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof.
Is an embedded metal, 3 is a loop bar, 4 is a stir bar, and 5 is concrete.

As shown in FIG. 1, this PC foundation beam member has a rectangular long side as a bottom and a short side as a height, and as shown in FIG. 3, has a rectangular parallelepiped shape having a thickness equal to or shorter than this short side. So, to give an example of dimensions, in the rectangle in Fig. 1, the left and right lengths are 900 mm or 1800 mm, and the top and bottom heights are
It has a thickness of 600 mm and a thickness of 120 mm or 150 mm. A rectangular loop streak 3 is arranged parallel to the outer periphery of the rectangle in FIG. 1 and separated by a predetermined dimension corresponding to at least the required cover thickness of concrete (usually 40 mm or more), and at the center in the thickness direction. Inside the four corners of the streak 3, the embedded metal fitting 1 is welded in the thickness direction, that is, in the horizontal direction. The embedded hardware 1 is a steel rod-shaped body having a length equal to the thickness of the PC foundation beam member.
As will be described later, since the adjacent PC base beam members are joined together by screwing the connection metal fittings between the embedded metal fittings 1, the embedded metal fittings are formed with bolt holes for screwing the connection metal fittings 6. There is.

As shown in FIG. 1, it is preferable to appropriately install a reinforcing bar such as a stirrup bar 4 inside the loop bar 3. Fig. 4 shows the embedded metal part 1 and loop streak 3 which are steel parts.
And FIG. 5 is a perspective view showing a state in which the stirrups 4 are assembled.
Is a modified example in which, instead of the ribs 4 in FIG. 4, a mesh body 4a in which reinforcing bars are assembled in a lattice shape is attached. In the case of the stirrup 4, as shown in FIG. 4, both ends are bent and wound around the loop streak 3 or fixed by spot welding.
There is concern that the work will take time and that the loop heat will be adversely affected by the welding heat. In the case of the mesh body 4a, it suffices to hook the loop body 3 which has been assembled in advance on the loop muscle 3, so that it is efficient and there is no worry about strength.

FIG. 6 is a horizontal partial cross-sectional view taken along the line AA in FIG. 1. The embedded metal 1a in this figure is a round steel rod in which bolt holes having a screw of a predetermined depth are formed in the approximate centers of both end surfaces. The connection hardware is connected by screwing bolts from both sides. On the other hand, FIG. 7 shows a modified example in which a steel pipe is used as the embedded metal 1b instead of the round steel rod, and the connecting metal is connected by inserting a through bolt into the steel pipe.

The thickness of the PC foundation beam member is, for example, 150
When it is as large as mm, it is preferable to attach two loop streaks 3 at intervals in the thickness direction. In this case as well, it is necessary to secure a cover thickness from the surface. FIG. 8 shows that the PC foundation beam members P of this embodiment are laid and arranged on the PC board B.
It is a perspective view showing the state where adjacent PC foundation beam members P were combined, and 6a and 6b are connection metal objects. That is, adjacent PC
Since the PC foundation beam member P is coupled by applying the connecting hardware 6a, 6b to the foundation beam member P and inserting and tightening the bolt into the embedded hardware 1, it is not necessary to fix it with mortar or the like, and the building is used. When it disappears, the bolts can be removed to easily remove the PC foundation beam member P,
Can be reused repeatedly. Embedded hardware 1,
Since 1a is fixed to the inner corner of the loop muscle,
The horizontal pulling force from the adjacent PC foundation beam members P can be transmitted via the connecting hardware 6a, 6b. In order to absorb the error in the longitudinal direction of the foundation, it is also effective to insert a rubber sheet into the connection surface between the PC foundation beam members P.

Further, instead of simply laying the PC foundation beam members P on the PC board B, the PC foundation beam members P are fitted into the PC board B in order to prevent lateral displacement and rising due to an earthquake, vibration, or the like. FIG. 9 shows an example of a combined structure when fixed. Grooves in the base longitudinal direction are formed on the PC board B at positions where the PC base beam members P are mounted, and a plurality of lateral grooves are provided at appropriate intervals in the direction perpendicular to the grooves. The lateral groove is convenient for inserting the tip of a tool such as a burl and finely adjusting the position of the PC foundation beam member P by the lever action.

Further, an example of a connecting structure for securely fixing the PC foundation beam member P to the PC plate B with bolts or the like is shown in FIG.
Through Figure 12. 10 is a front view showing a partial cross section of the connecting portion, FIG. 11 is a cross sectional view taken along the line BB of FIG. 10, and FIG. 12 is a plan view showing a recess H in the PC board B corresponding to the connecting portion of the PC foundation beam member P. Has been formed. 7 is a fixed metal fitting, which is provided with a tap hole on the side surface of the connecting metal fitting 6b to be used at the bottom and is screwed to the fixed metal fitting 7, while the fixed metal fitting 7 is a bolt or the like to an insert nut embedded in the PC board B. Fix it. It is preferable that the bolt holes of the fixed hardware 7 have a shape capable of absorbing some positional deviation, such as an oval shape.

Embodiment 2 FIG. 13 is a front view showing a second embodiment of the PC foundation beam member of the present invention. The difference from Embodiment 1 is that it is located near the center in the height direction.
That is, two embedded metal pieces 2 are added at one place in contact with the inside of the loop line 3. The embedded metal 2 is the same as the embedded metal 1 attached to the corner portion. FIG. 14 is a perspective view showing a connected state of the PC foundation beam members of this embodiment. A connection metal piece 6c is used near the center in the height direction corresponding to the embedded metal piece 2. Since the embedded metal 2 resists the shearing force of the loop muscles 3 against the tensile load in the horizontal direction, a stronger bonded state can be obtained as compared with that of the first embodiment.

Although FIGS. 13 and 14 show an example in which two buried metal pieces 2 are added at one place in the vicinity of the center in the height direction, one group is still effective. FIG. 15 shows a modification in which one embedded metal piece 2 is provided for each location and one connection metal piece is provided over the entire height of the side surface. Third Embodiment A third embodiment of the PC foundation beam member of the present invention is shown in FIGS.
Shown in FIG. 16 is a front view of the PC foundation beam member, FIG. 17 is a plan view of the same, and FIG. 18 is a perspective view of the embedded metal. The difference from the second embodiment is that the corner portion of the loop streak 3 is shown in FIG. The embedded metal piece 1c to be attached is one in which ribs are provided in the horizontal direction. Needless to say, this rib resists the bending action of the embedded metal 1a due to the connecting metal and the loop streak 3, so that a stronger bonded state can be obtained as compared with the first or second embodiment.

Incidentally, it goes without saying that this rib is effective not only in the embedded metal 1 arranged at the corner of the loop line 3 but also in the embedded metal 2 added near the center in the height direction. Nor. Further, the embedded metal may be either a round steel rod type (1a) shown in FIG. 6 or a steel pipe type (1b) shown in FIG. Fourth Embodiment A fourth embodiment of the PC foundation beam member of the present invention is shown in the perspective view of FIG. That is, this embodiment is characterized in that the corner metal fittings 8 are mounted on the surfaces of the connecting portions at both ends of the PC foundation beam member. FIG. 20 shows the corner metal fitting 8 (a) is a plan view, (b) is a horizontal sectional view taken along the CC line in (a), and (c) is a side view. To prevent separation from the concrete part on the inner surface,
A horizontal attachment piece 9 is provided.

It is desirable that the corner metal fitting 8 is cast at the stage of pouring concrete in manufacturing the PC foundation beam member. Corner hardware 8 is embedded hardware 1a, 1b
Alternatively, it is necessary to provide a hole or window at the position of the embedded metal because the screw hole portion such as 2 should not be blocked. It is desirable that the attachment piece 9 has a rod shape or a strip shape. In this way, if the concrete parts of the connection surface at both ends of the PC foundation beam member are covered with the corner hardware 8, unlike the case where the concrete is exposed, the periphery of the connection surface is not damaged when repeatedly used, A longer life can be expected.

In each of the embodiments described above, only a basic rectangular parallelepiped member is shown as the PC foundation beam member, but as shown in the plan view in FIG. 21, various planar shapes are used depending on the base portion. It will be convenient. In FIG. 21,
(A) is the same rectangular parallelepiped as described above. The left and right lengths are the module size M. (B) is an L-shape used for the corner portion of the foundation, and has a shape in which two pieces having a length approximately half that shown in (a) are joined at right angles to each other at the short side portions. (C) is a T-shape used for the inner wall connection part, etc.
It has a shape in which the length of approximately half of that shown in (a) is joined at a right angle at the short side portion. (D) is a cross-shaped member used at a wall intersection or the like, and has a shape in which four pieces having a length substantially half that shown in (a) are joined at right angles to each other at their short sides. The embedded hardware 1 is arranged in the thickness direction near each end.

[0024]

According to the present invention, since mortar work is not required for the joint portion, it can be easily disassembled and reused, and foundation work can be performed throughout the four seasons even in cold regions. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a PC foundation beam member showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of the PC foundation beam member showing the first embodiment of the present invention.

FIG. 3 is a side view of a PC foundation beam member showing the first embodiment of the present invention.

FIG. 4 is a perspective view showing a steel material portion in the first embodiment of the present invention.

FIG. 5 is a perspective view showing a modified example of the steel material portion according to the first embodiment of the present invention.

FIG. 6 is a horizontal partial cross-sectional view taken along the line AA in FIG.

FIG. 7 is a horizontal partial sectional view showing a modification example of FIG.

FIG. 8 is a perspective view showing a combined state of the PC foundation beam members in the first embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a usage state of the PC foundation beam member in the first embodiment of the present invention.

FIG. 10 is a front view showing, in a partial cross-section, a joined state of the PC foundation beam members in the first embodiment of the present invention.

11 is a horizontal partial cross-sectional view showing a BB arrow in FIG. 10.

FIG. 12 is a plan view showing a combined state of the PC foundation beam members in the first embodiment of the present invention.

FIG. 13 is a partial cross-sectional front view of a PC foundation beam member showing a second embodiment of the present invention.

FIG. 14 is a perspective view showing a combined state of PC foundation beam members in the second embodiment of the present invention.

FIG. 15 is a perspective view showing a modified example of the connection state of the PC foundation beam members in the second embodiment of the present invention.

FIG. 16 is a partial cross-sectional front view of a PC foundation beam member showing a third embodiment of the present invention.

FIG. 17 is a partial cross-sectional plan view of a PC foundation beam member showing a third embodiment of the present invention.

FIG. 18 is a perspective view showing an embedded metal article according to a third embodiment of the present invention.

FIG. 19 is a perspective view of a PC foundation beam member showing a fourth embodiment of the present invention.

[FIG. 20] FIG. 20 is a plan view showing a corner metal fitting in a fourth embodiment of the present invention, FIG. 20B is a horizontal sectional view taken along the CC line in FIG. 20A, and FIG.

FIG. 21 is a plan view showing various planar shapes of a PC foundation beam member according to an example of the present invention.

FIG. 22 is a perspective view of a cloth foundation showing a conventional technique.

FIG. 23 is a cross-sectional view of a cloth foundation showing a conventional technique.

FIG. 24 is a front view of a PC foundation beam showing a conventional technique.

FIG. 25 is a plan view of a PC foundation beam showing a conventional technique.

FIG. 26 is a horizontal cross-sectional view of a PC foundation beam connection portion showing a conventional technique.

[Explanation of symbols]

 1, 2 Embedded hardware 3 Loop reinforcement 4 Stirrup 4a Mesh body 5 Concrete 6 Connection hardware 7 Fixed hardware 8 Corner hardware 9 Attached piece 91 Tensile rebar 92 Receiver (joint) 93 Joint (joint) 94 Pin 95 Cover plate B PC Plate P PC Foundation beam member S Sand

Claims (6)

[Claims] 1. A rectangular parallelepiped PC foundation beam member having a long side as a bottom and a short side as a height, and having a thickness equal to or less than the short side, the parallel to the outer periphery of the rectangle. One or two rectangular loop streaks (3) are arranged inside at least a predetermined concrete cover thickness and in the thickness direction at least a predetermined concrete cover thickness, and the loop is formed. Muscle (3)
Inside of each corner of the above, an embedded metal article (1) having a length equal to the thickness of the PC base beam member in the thickness direction and having a rod hole having a bolt hole for screwing the connection fitting is joined. PC foundation beam member characterized by. 2. A length equal to the thickness of one or two PC foundation beam members is provided not only on the inside of each corner of the rectangular loop line (3) but also on the inside near the center in the height direction. The PC foundation beam member according to claim 1, wherein the embedded metal member (2) having a rod-shaped body having a bolt hole for screwing the connection fitting is joined thereto. 3. The embedded metal (1) joined to the inside of each corner of the rectangular loop line (3) is provided with a horizontal rib toward the inside of the rectangle.
The PC foundation beam member described in. 4. The PC foundation beam member according to claim 1, wherein a mesh body (4a) made of a lattice-shaped reinforcing bar is attached to the inside of the rectangular loop bar (3). 5. The PC foundation beam member according to any one of claims 1 to 4, wherein a corner metal member (8) made of a thin steel plate having a U-shaped cross section is mounted on the surface of the rectangular PC foundation beam member near the short side. . 6. P according to any one of claims 1 to 5.
A PC foundation beam member formed by joining a plurality of C foundation beam members or a plurality of PC foundation beam members having a length approximately half thereof at right angles to each other at their short sides.