JP3683419B2 - PC foundation beam member and concrete cloth foundation construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a rectangular parallelepiped precast concrete foundation beam member (hereinafter referred to as a rectangular parallelepiped-shaped precast concrete foundation beam member which is erected on a foundation concrete laid continuously in the horizontal direction on the ground to construct a fabric foundation for a building such as a house or office. PC foundation beam member) and a concrete cloth foundation construction method.
[0002]
[Prior art]
In recent years, cast-in-place concrete has been reduced as much as possible by using factory-produced PC foundation beam members in the foundations of fabric foundations for buildings such as houses and offices, shortening the construction period and increasing the reliability of the members. PC foundation beam structure is widely adopted.
As an example, FIGS. 28 and 29 show a fabric foundation using a PC foundation beam member described in JP-A-48-32309. FIG. 28 is a perspective view of this fabric foundation, FIG. 29 is a cross-sectional view in the transverse direction, 1 is a rectangular parallelepiped PC foundation beam member, 3 is a foundation plate made of precast concrete, and S is sand. First, the fabric foundation is rooted, sand S is horizontally spread on the bottom surface, and the foundation 3 is laid horizontally while adjoining in the longitudinal direction, and a rectangular parallelepiped near the center of the upper surface in the width direction. PC-shaped foundation beam members 1 are arranged in a vertical posture, and the soil is backfilled up to the line indicated by GL.
[0003]
As a coupling means between adjacent PC foundation beam members, joints having pin holes at both ends of a horizontal reinforcing bar embedded in the PC foundation beam member parallel to the top and bottom surfaces and separated by a predetermined cover thickness are provided. In general, a pin is driven into and joined to this.
An example of a conventional PC foundation beam member will be described with reference to FIGS. 30 is a front view of the PC foundation beam member, and FIG. 31 is a plan view of the same. In the PC foundation beam member 1, horizontal reinforcing bars 11 and reinforcing bars such as a stirrup connecting them are embedded in two stages, and joints 12 and 13 having pin holes are attached to both ends of the horizontal reinforcing bar 11. The joints 12 and 13 protrude from a vertical groove 17 provided in the vertical direction at the center of the horizontal end face of the PC foundation beam member 1. One joint 12 is a receiver in which a steel plate having a pin hole is divided into two pieces, The joint 13 is a hand made of a single steel plate of the same shape, and the adjacent PC foundation is inserted by inserting a pin into the pin hole with the joint 13 inserted between the two steel plates of the joint 12. Beam members are connected.
[0004]
An example of the joining structure will be described with reference to FIG. This figure is a partial cross-sectional view showing a joint portion between adjacent PC foundation beam members 1 and 1 cut in the horizontal direction. In FIG. 32, if the upper side is the outer surface of the building foundation and the lower side is the inner surface, the connection gap 25 is normally constructed to be about 2 mm. The upper and lower positions of both ends of the PC foundation beam member 1 on the side where the pin is driven (usually the inner side) are notched by the notch surface 20 for pin driving, and the notch surfaces 20 on both sides are larger than the connection gap 25. A wide opening is formed. From this opening, the pin 14 is driven into the pin holes of the joints 12 and 13.
[0005]
After driving the pin 14, if necessary, the connection gap 25 on the opposite side is covered with adhesive tape or the like, the pin 14 is covered with a stopper plate 15 and fixed with a nut 16, and a mortar (not shown) in the connection space. )).
As described above, since there is an operation of driving a connecting pin into the connecting portion, the conventional PC foundation beam member has cutouts at four corners on one side, and there is no such on the opposite side. Therefore, when placing the PC foundation beam member, care must be taken so that the notched side is the pin driving side.
[0006]
Incidentally, as shown in FIG. 33, the PC foundation beam member has the L-shape shown in (b), the T-shape shown in (c), and the (d) shown in FIG. Various plane shapes such as a cross shape are required. If the PC base beam member itself has an inner surface side and an outer surface side, for example, in the case of the L shape of (b) used for the corner portion, the corner of the corner is the so-called entering corner or the outer corner, and the pin driving side is reversed. However, as mentioned above, there are different types of joints and receivers as mentioned above. Considering these, many kinds of PC foundation beam members with different details even though they are similar at first glance There was a problem that we had to prepare and arrange them without fail.
[0007]
[Problems to be solved by the invention]
The first object of the present invention is to unify the shapes of the PC foundation beam members in the manufacturing stage to reduce the types, cut down the manufacturing cost and facilitate the construction.
In addition, the fabric foundation made of such PC foundation beam members is superior in quality reliability and workability compared to conventional cast-in-place concrete only, but it is expensive and the construction site May not be adopted due to circumstances such as the location where heavy trucks cannot enter. In view of such a case, the second object is to realize a cloth foundation installation method that uses the advantages of the PC material while reducing the weight of the member and using the locally applied concrete together.
[0008]
[Means for Solving the Problems]
The PC foundation beam member of the present invention is , table Front and back Is a horizontally long rectangular shape with a thickness of Less than or equal to the height of this rectangle Is The rectangular parallelepiped PC foundation beam member is provided with horizontal reinforcing bars that are embedded in parallel with the upper and lower bottom surfaces of the PC foundation beam member and separated by a predetermined cover thickness, and is vertically oriented at the center of the horizontal end face of the PC foundation beam member. In the height direction centering on the horizontal reinforcing bar position on both sides of the vertical groove provided in the bottom of the PC foundation beam member, a recess is formed on the inner side of the partition wall, leaving a thin partition wall on the front and back sides. Characteristic or this PC foundation beam member in the longitudinal center position Split PC foundation beam divided into left and right by Double several The Connected at right angles to each other at the split position What Preferably, embedded bottom nuts are embedded in the bottom or side of the PC foundation beam member, or there are horizontal grooves in the lower part of the front and back surfaces of the PC foundation beam member, or on the upper surface of the PC foundation beam member. The PC foundation beam member having a terrace portion slightly higher than this.
[0009]
In the connecting method of the PC foundation beam member of the present invention, joints are attached to both ends of the horizontal rebar, and the partition wall on either the front surface side or the back surface side of the PC foundation beam member to be connected at the horizontal end face is cut out for connection. An opening is formed in the portion, and a pin is driven into the joint from the opening.
Furthermore, in the construction method of the concrete fabric foundation of the present invention, an insertion groove is formed in the center in the longitudinal direction, and a foundation plate provided with a horizontal bolt toward the insertion groove perpendicular to the insertion groove is formed on both sides thereof. It is arranged on the bottom surface of the ground, the PC foundation beam member is laid in the fitting groove in a vertical posture, and is connected to the foundation plate by the horizontal bolt to form an inverted T-shaped fabric foundation. Yes, or root the ground Temporary receiving member Place ,this Temporary receiving member Before PC foundation beam member To a height corresponding to the thickness of the solid foundation to be placed Placing the concrete of the solid foundation as it is temporarily received, and connecting the PC foundation beam member and the solid foundation together to form an inverted T-shaped fabric foundation Ruko And features Is a thing .
[0010]
The temporary receiving member includes a lower plate, legs that are attached to the lower plate and support the upper plate, and anchor bolts that protrude upward through the upper plate. thing Or a lower plate, an anchor bolt having a head joined to the upper surface of the lower plate, a nut screwed into the anchor bolt, and an upper plate joined to the upper surface of the nut. thing Is preferred.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The PC foundation beam member of the present invention includes horizontal rebars embedded in parallel with the upper and lower bottom surfaces of the rectangular PC foundation beam member and spaced apart by a predetermined cover thickness, and at the center of the horizontal end face of the PC foundation beam member. In the height direction centering on the horizontal reinforcing bar position of the both sides of the vertical groove provided in the vertical direction, a hollow is formed inside the PC foundation beam member, leaving a thin partition wall on the front and back sides. Therefore, the PC foundation beam members have the same shape in principle at the manufacturing stage, and when constructing the fabric foundation, the PC foundation beam members can be arranged without considering the type and orientation, and only the positions where the pins are driven in when connecting are described above. A thin partition was cut out to form an opening.
[0012]
In addition, when constructing a fabric foundation with an inverted T-shaped cross section using this PC foundation beam member, a method of laying and placing a PC foundation plate produced at the factory, and temporarily receiving the PC foundation beam member at a predetermined height There is a method of placing concrete and integrating it with a solid foundation, or a method of forming a fabric foundation using the PC side wall made by factory production as a discarded formwork. Work is extremely efficient, and there is no need to disassemble the formwork, the appearance is good, and the amount of wood used for formwork is reduced. Since the amount is minimized, there are advantages such as high reliability and shortening the construction period.
[0013]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings.
[Example 1]
First, one embodiment of the PC foundation beam member of the present invention will be described. FIG. 1 is a front view showing a partial cross-sectional view of an embodiment of a PC foundation beam member of the present invention, FIG. 2 is a plan view of the same, 1 is a PC foundation beam member, 11 is a horizontal reinforcing bar embedded therein, 17 Is a vertical groove provided in the vertical direction at the center of both horizontal end faces of the PC foundation beam member 1, 23 is an embedded nut, for example, M12 embedded in the lower surface of the PC foundation beam member 1, and 24 is also the PC foundation beam member 1. It is an embedded nut embedded in the side. These roles will be explained later. The embedded nut 23 is located at the center of the bottom surface in the width direction, with one or three sides in the longitudinal center, and the embedded nut 24 has a height on one or both sides. It is preferable to provide a plurality of locations at a pitch of 200 to 300 mm in the longitudinal direction in the center of the direction.
[0014]
The PC foundation beam member 1 shown in FIG. 1 is used for the foundation of a straight portion, and is a rectangular parallelepiped shape having a rectangular front and back surfaces and a thickness equal to or less than the height of the rectangle. For example, the horizontal length in FIG. 1 is 900 mm or 1800 mm, the vertical height is 600 mm, and the thickness is 120 mm or 150 mm.
Both ends of the horizontal rebar embedded parallel to the upper and lower bottom surfaces of the PC foundation beam member 1 and spaced apart by a predetermined cover thickness project into vertical grooves provided in the vertical direction at the center of the horizontal end surface of the PC foundation beam member. At the time of construction, joints 12 and 13 are attached to both sides by screwing or the like. The joints 12 and 13 are similar to those described in FIGS. 30 to 32 above, one is a receiver and the other is a hand, but it is not attached in advance to the PC foundation beam member, so it is attached at the time of construction. The PC foundation beam member also has no direction in this respect and is easy to construct. As shown in FIG. 6, which will be described later, a discard nut 11a is attached to both ends of the horizontal rebar 11 and is positioned at a position where it is just embedded.
[0015]
FIG. 3 is a partially enlarged view showing a horizontal end of the joint height of the PC foundation beam member 1 indicated by symbol A in FIG. 1, and FIG. 4 is a horizontal end of the PC foundation beam member 1 indicated by symbol B in FIG. It is the elements on larger scale of a part. That is, as seen in FIG. 4, the outer surface of the PC foundation beam member 1 extends to the full end on both the front side and the rear side, but in the height direction centering on the position of the horizontal rebar 11, A recessed portion 18 is formed on the inner side of this partition wall (the side closer to the longitudinal groove 17), leaving a thin partition wall 19. Since this shape is symmetrical in the thickness direction, that is, the same for both the front surface side and the back surface side, the PC foundation beam member 1 can be arranged without considering which side faces the front during construction. After installation, only on the side where the pin is driven, the shape is the same as that of a conventional PC foundation beam member in which an opening is formed by splitting concrete with a hammer or the like along the notch surface 20 shown by a broken line in FIG. Then, a pin is driven from the opening toward the joint. FIG. 5 is a perspective view of the same portion shown in a state where the front partition wall 19 is removed along the notch surface 20 (however, the joint is not shown).
[0016]
The state in which the pins are driven and joined will be described with reference to FIG. Similar to FIG. 32 described above, this figure is a partial cross-sectional view showing a joint portion between adjacent PC foundation beam members 1 and 1 cut in the horizontal direction. In the figure, the upper side is the outside of the building foundation, and the lower side is the inside. As described above, the connection gap 25 is usually about 2 mm. The partition wall 19 of the PC foundation beam member 1 is notched by the notch surface 20 at the position where the pin is driven as described above, and wide openings are formed by the notch surfaces 20 on both sides. From this opening, the pin 14 is driven into the pin holes of the joints 12 and 13. After the pins 14 are driven in, the stopper plate 15 is covered and fixed with the nut 16, and the connecting space is filled with mortar (not shown).
[0017]
As described above, the PC foundation beam member of the present invention is manufactured to have a symmetrical shape in the thickness direction without any difference between the front and back surfaces (inner surface side, outer surface side), and therefore, the number of types of concrete formwork and products during the manufacturing can be reduced. The biggest advantage is. Then, the partition on the side into which the pin is driven is cut out during the construction to form an opening. Therefore, it is desirable that the partition wall has a thickness that can be easily broken, for example, 8 mm on the thick side near the main body and about 6 mm on the thin side near the end face. With this thickness, a large aggregate does not enter the partition even when placing concrete, so it is easier to cut out.
[0018]
The shapes of the recess 18 and the partition wall 19 are not limited to those shown in FIGS. An example of another shape is shown in FIG. FIG. 7 is a partial perspective view showing a portion corresponding to FIG. 5. The recess 18 has a semi-circular cross section having a dimension sufficient for pin driving, for example, a radius of 15 mm, and the thickness of the partition wall 19 is, for example, 3 mm. Needless to say, the position of the depression 18 is the height of the horizontal rebar 11.
[0019]
FIG. 8 is a front view showing the surface of the PC foundation beam member 1, 21 is a pattern groove formed on the surface, and 22 is a horizontal groove formed in the horizontal direction below the surface. The PC foundation beam member 1 is shown with joints 12 and 13 attached.
The pattern groove 21 is provided for the sake of beauty because the PC foundation beam member 1 remains visible as the foundation part of the building. In this example, the pattern groove 21 is a vertical groove. Anything such as a waveform may be used. Since the PC foundation beam member 1 of the present invention does not know which side is used on the outside at the manufacturing stage, the pattern grooves 21 are preferably provided on both sides.
[0020]
The role of the horizontal groove 22 will be described later.
FIG. 9 is a front view showing an example in which a terrace portion 1 a slightly higher than this is provided on the upper surface of the PC foundation beam member 1. For example, in this figure, a terrace portion 1a having a height of 20 mm is provided over a central portion of about 440 mm with respect to a length of about 910 mm in the left-right direction of the PC foundation beam member 1. FIG. 10 is a front view showing a construction example in which these are continuously laid. When the upper structure H is installed on this foundation, a space D is formed above the foundation beam by the terrace portion 1a of each PC foundation beam member 1 and becomes a ventilation opening. Conventionally, there is an advantage that the workability is better and that the size of the engagement with the anchor bolts F is accurate compared to the case where a kana equivalent to the terrace portion 1a is inserted for the same purpose.
[Example 2]
Next, an embodiment of the concrete cloth foundation construction method of the present invention will be described.
[0021]
First, an embodiment in which the foundation is used as in the conventional technique described above will be described with reference to FIGS. PC foundation beam members are stabilized by their own weight and the frictional force due to the weight of the building built above them, even if they are simply placed on a foundation slab laid horizontally as in the past. This is not sufficient when horizontal force, moment, lift, etc. are expected, and a structure that is firmly fixed to the foundation is preferred. Therefore, in the PC foundation beam member, as shown in FIG. 8, a horizontal groove 22 is formed in the horizontal direction at the lower surface. On the other hand, for example, as shown in FIG. 11, horizontal bolts 32 are arranged on both sides of the insertion groove 31 at the center in the longitudinal direction of the foundation plate 3 so as to be perpendicular to the insertion groove 31, and the tip of the horizontal bolt 22 is the horizontal groove 22 of the PC foundation beam member. And the PC foundation beam member may be fixed.
[0022]
Alternatively, as shown in FIGS. 12 and 13, protrusions 33 are provided on both sides of the insertion groove 31 at the center of the longitudinal direction of the foundation plate 3 in parallel with this to form a horizontal groove 34 on the inner surface, and the PC foundation beam member 1 The PC foundation beam member can be fixed by driving a cotter 35 between the horizontal grooves 22 or filling mortar. The horizontal grooves 22 of the PC foundation beam member 1 are thus provided as necessary by means of coupling with the lower part of the fabric foundation.
Example 3
Depending on the local topography and the like, it may be more advantageous to cast concrete to make a “solid foundation” than to dig and lay a foundation. A connection structure between the foundation and the PC foundation beam member 1 in this case will be described.
[0023]
FIG. 14 is a cross-sectional view showing the fabric foundation of this embodiment. The ground is rooted, and a base plate L such as a concrete plate is laid on the bottom surface as necessary, and a temporary support metal 4 is placed thereon and placed. The PC foundation beam member 1 is temporarily received at a height corresponding to the thickness of the solid foundation, and the concrete C of the solid foundation is placed. If the horizontal groove 22 is provided in the PC foundation beam member 1, since the concrete C bites in, the connection is strengthened.
[0024]
FIG. 15 is a front view showing an example of the provisional metal fitting 4. The lower plate 41 is joined to the head, the bolt 45 having the horizontal stripes 44 attached to the trunk portion in the direction perpendicular to the screw portion is turned upward, and the nut 46 is joined to the upper surface to which the upper plate 42 is joined. On the other hand, an embedded nut 23 is embedded in the lower surface of the PC foundation beam member 1. It is desirable that the embedded nut 23 is a long nut and is firmly joined to the PC foundation beam member 1 with an anchor bar.
[0025]
The threaded portion of the temporary support metal 4 is screwed into the embedded nut 23 and coupled to the PC foundation beam member 1. If the bolt 45 is rotated using the horizontal bar 44 as a handle, the height of the PC foundation beam member 1 can be adjusted even in a temporarily received state. After the concrete is placed, the temporary support 4 is buried in the concrete and becomes a coupling means for coupling the PC foundation beam member 1 to the solid foundation as it is. The horizontal bars 44 are arranged in a direction perpendicular to the bolts 45 and can be used to support other bars.
[0026]
If the PC foundation beam members 1 are sequentially connected in the horizontal direction at the time of provisional reception, each of the PC foundation beam members may have only one provisional metal fitting, but at least one provisional arrangement is initially provided. It is better to attach two hardware. Therefore, the number of embedded nuts 23 embedded in the lower surface of the PC foundation beam member is three, and it is preferable to use one center or two on both sides. Since these embedded nuts 23 can also be used as suspension bolt holes when the PC foundation beam member is transported, it is convenient to provide it for the PC foundation beam member used in the field that is not a solid foundation.
[0027]
In addition, as shown in FIG. 16, if the joint part of the PC foundation beam member 1 is supported by a block M made of concrete or the like having a constant height, the head part of the temporary receiver 4 is lifted from the floor plate. It is also possible to use it only as a joint hardware with a solid foundation.
FIG. 17 is a perspective view showing another example of the provisional metal fitting 4. An upper plate 42 is arranged above the lower plate 41 via legs 43, and the distance between these two steel plates is the thickness of the foundation. A horizontal bar 44 is attached to the intermediate height of the leg 43, and a bolt 45 is attached to the upper plate 42 from below the upper plate 42. The screw 45 is attached to the embedded nut 23 of the PC foundation beam member 1. Screwed into.
[0028]
A modification in the case of a solid foundation will be described with reference to FIG. Depending on the terrain, it may be advantageous to change the level of rooting inside and outside the foundation. In the example of FIG. 18, the right side is shallowly rooted toward the foundation beam. In such a case, the shallow solid foundation can be arranged by using the embedded nut 24 embedded in the side surface of the PC foundation beam member 1 and screwing the reinforcing bar 8a to the reinforcing base 8b.
Example 4
FIG. 19 is a transverse sectional view showing a fabric foundation according to a fourth embodiment of the present invention, and corresponds to a ZZ section in FIG. 25 described later. The same reference numerals are used for those described so far. Reference numeral 5 denotes a PC side wall, 6 denotes a lower ladder-shaped reinforcing bar, and 8 denotes a longitudinal reinforcing bar arranged by connecting the lower ladder-shaped reinforcing bars 6.
[0029]
In the example of the fabric foundation that is continuous in the longitudinal direction, the ground is rooted and a pair of L-shaped PC side walls 5 are parallel to each other with the bottom flanges facing each other in parallel with the bottom flange facing horizontally. The lower ladder-type reinforcing bars 6 are arranged at appropriate intervals in a direction crossing the PC and are connected to the PC side walls on both sides. In a vertical position. The PC foundation beam member 1 is connected in the longitudinal direction by, for example, a pin joint as shown in FIG. Since the embedded nut 23 is embedded in the bottom surface of the PC foundation beam member 1, a bolt 45 is screwed into this and placed on the lower ladder rebar 6, and concrete C is placed on the inner surface of the lower PC side wall 5. The PC foundation beam member 1, the cast concrete C, and the PC side wall 5 are integrally coupled to form an inverted T-shaped fabric foundation.
[0030]
20 is a plan view of the PC side wall 5, FIG. 21 is a front view, FIG. 22 (a) is a cross-sectional view taken along arrow XX in FIG. 21, and (b) is a cross-sectional view taken along arrow YY in FIG. The bottom flange 52 is a vertical flange, and the extending direction of the bottom flange 51 is the inner surface. 53 is a protrusion protruding from the vertical flange 52 onto the bottom flange 51, 54 is a round hole provided in two vertical directions at the tip of the protrusion, 55a is a cotter groove provided horizontally on the inner surface of the vertical flange 52, 55b Is a cotter groove provided in the vertical direction on the side surface of the projecting portion 53, and 56 is a thin wall portion provided at the upper end of the vertical flange.
[0031]
The PC side wall 5 is formed in an L shape by a bottom flange 51 and a vertical flange 52, and a protrusion 53 is formed on the inner surface of the vertical flange 52 up to the top of the bottom flange 51 as appropriate. Two round holes 54 are provided in the front end surface of the projecting portion 53 in the vertical direction, and both ends of the lower ladder-shaped reinforcing bar 6 are inserted therein. The cotter grooves 55a and 55b are for reinforcing adhesion when concrete is poured. The thin portion 56 is provided so that it can be easily removed, for example, when it is connected to a fabric foundation in a perpendicular direction. If the poured concrete and the PC side wall are integrated, there is no risk of strength reduction due to the thin wall.
[0032]
The dimensions of the PC side wall 5 may be appropriately determined depending on the module of the structure supported by the cloth foundation, the load, etc. For example, the PC side wall 5 has a length of 910 mm, the bottom flange 11 has a width of 90 mm, and a thickness of 25 mm. The vertical flange 52 has a height of 150 mm and a thickness of 30 mm, and four protrusions 13 are provided in the middle in the longitudinal direction at a pitch of 228 mm.
FIG. 23 is a front view of the lower ladder-shaped reinforcing bar 6, 61 is an upper chord material, 62 is a lower chord material, 63 is a connecting bar that connects these members up and down at multiple points, and 64 is an upper chord material 61 and a lower chord near the center of the length. It is a pipe member that is attached vertically by connecting the material 62, and the bolt 45 is inserted therein.
[0033]
As an example of dimensions, each bar uses a deformed steel bar D10, the length of the upper chord material 61 and lower chord material 62 is 330 mm, the interval is 60 mm, and the central pipe member 64 is a black pipe (carbon steel pipe for piping) Use a nominal diameter of 10 mm. Assembly is spot welding. If both ends of 15 mm are inserted into the protrusions 53 of the PC side wall 5, the inner distance between the pair of PC side walls 5 is 300 mm. A pair of connecting bars 63 are arranged so as to be inside or outside the formwork and used for positioning. For this reason, the head is slightly protruded.
[0034]
FIG. 24 is a partial cross-sectional view showing a connection portion between the end portion of the lower ladder-shaped reinforcing bar 6 and the protruding portion 53 of the PC side wall 5. FIG. 24A corresponds to FIGS. 19 to 23 described so far. (B) is a modification thereof, and at least one of the upper chord member 61 and the lower chord member 62 of the lower ladder-shaped reinforcing bar 6, in this figure, the upper chord member 61 has a length that penetrates the PC side wall 5 and is provided with a screw at the tip. The interval between the PC side walls 5 can be adjusted by screwing a nut 65 from the outside.
[0035]
FIG. 25 is a plan view showing a state before placing concrete in this embodiment. The bottom of the PC foundation beam member 1 is slightly lower than the top surface of the PC side wall 5, but in this figure, the PC foundation beam member 1 happens to be connected in a T shape. About the upper edge part, the thin part 56 shown in FIG.22 (b) is notched.
[0036]
In the first to fourth embodiments described above, the PC foundation beam member has been described as having a rectangular parallelepiped shape, that is, the one corresponding to (a) in FIG. Regarding the shape of the end portion which is a characteristic part of a shape in which a plurality of divided PC foundation beam members divided into two are connected at right angles to each other at the dividing position, that is, each planar shape shown in FIG. These are all the same, and it goes without saying that the present invention can be applied to them, and as described above, the same can be used at both the entering corner and the outer corner, so that these can be used in the effect of reducing the types. Is even bigger.
Example 5
Unlike the previous examples, a construction example in which no PC foundation beam member is used will be described. FIG. 26 is a transverse sectional view showing the fabric foundation of the fifth embodiment of the present invention. The same reference numerals are used for items that are the same as those described so far, 7 is a round steel column that is erected near the center of the lower ladder rebar 6, and 9 is a longitudinal direction supported by the column 7 and An upper ladder rebar, P, in a vertical posture is a pair of molds erected on both sides of the upper ladder rebar at a predetermined interval on the upper surface of the lower ladder rebar 6.
[0037]
Up to the point where the ground is rooted and a pair of PC side walls 5 are laid horizontally on the bottom surface while adjoining in the longitudinal direction, and the lower ladder-shaped reinforcing bars 6 are arranged at appropriate intervals in a direction crossing the ground. This is exactly the same as in the fourth embodiment.
Next, a support column 7 is erected substantially at the center of the lower ladder-shaped reinforcing bar 6 and supported by the support column 7 so that the upper ladder-shaped reinforcing bar 9 is continuously attached in a vertical posture.
[0038]
FIG. 27 is a perspective view of the fabric foundation at this stage. Subsequently, a pair of molds P are similarly erected in parallel with the upper ladder rebar 9 while adjoining in the longitudinal direction, and concrete C is injected into the inside of the pair of molds P. Although not particularly illustrated, it is preferable to implant anchor bolts or the like as appropriate upward from the upper ladder-shaped reinforcing bar 9. Concrete C flows to the lower part through the inner surface of the mold P, is filled into the inner surfaces of the pair of PC side walls 5, and is integrally joined thereto. For the lower horizontal part, the lower ladder-shaped reinforcing bars 6 and For the longitudinal reinforcing bar 8 and the upper rising part, a fabric base having an inverted T-shaped RC structure having the upper ladder-shaped reinforcing bar 9 as a reinforcing reinforcing bar is formed.
[0039]
As shown in FIG. 26, it is advantageous to use a pair of connecting bars 63 of the lower ladder-shaped reinforcing bar 6 so as to be inside or outside the formwork and used for positioning. For this purpose, it is better to make the head slightly protrude.
Although the support 7, the longitudinal rebar 8, and the upper ladder rebar 9 are not shown again, a commercially available steel bar or the like is used in appropriate combination. For the pipe member 64 having a nominal diameter of 10 mm, for example, a round steel having an outer diameter of 12 mm is preferable. If the upper ladder-shaped reinforcing bar 9 is connected in the longitudinal direction, the lower longitudinal reinforcing bar 8 may not be used in this embodiment.
[0040]
The interval between the molds P is, for example, 120 mm or 150 mm.
In addition, the fabric foundation of the present embodiment is not limited to a linear shape continuous in the longitudinal direction, and any basic structure including a corner portion and a cross portion can be realized by appropriately combining such linear shapes in a perpendicular direction. Needless to say, you can.
[0041]
【The invention's effect】
According to the present invention, by reducing the types by unifying the end face shapes of the PC foundation beam members, it is possible to cut down the manufacturing cost, and it is not necessary to consider the orientation during construction, thereby improving efficiency. Play.
In addition, according to the present invention, the unit weight of the members to be carried is reduced and the workability in a residential area where a large truck cannot enter is improved, and the concrete of the local construction is used together with the advantage of the PC material. By doing so, an excellent effect is achieved that a low-cost and highly reliable fabric foundation can be realized.
[Brief description of the drawings]
FIG. 1 is a front view partially showing a cross-section of an embodiment of a PC foundation beam member of the present invention.
FIG. 2 is a plan view showing an embodiment of the PC foundation beam member of the present invention.
FIG. 3 is a partially enlarged front view showing a part A of FIG. 1;
4 is a partially enlarged plan view showing a portion B in FIG. 1. FIG.
FIG. 5 is a partial perspective view showing the same part as in FIGS.
FIG. 6 is a partial cross-sectional view showing a joint portion of a PC foundation beam member according to the present invention.
7 is a partial perspective view showing the same part as that of FIG. 5 in a modified example. FIG.
FIG. 8 is a front view showing the surface of the PC foundation beam member of the present invention.
FIG. 9 is a front view showing a modification of the PC foundation beam member of the present invention.
10 is a front view showing a construction example using the PC foundation beam member shown in FIG. 9; FIG.
FIG. 11 is a plan view showing an example of a foundation used for the fabric foundation of the present invention.
FIG. 12 is a perspective view showing another example of a foundation used for the fabric foundation of the present invention.
13 is a partial cross-sectional view showing a usage state of the foundation plate shown in FIG.
FIG. 14 is a transverse sectional view showing a fabric foundation according to a third embodiment of the present invention.
FIG. 15 is a front view showing a temporary metal fitting used in the present invention.
FIG. 16 is a front view showing a modified use example of the provisional metal fitting of the present invention.
FIG. 17 is a perspective view showing another example of the temporary metal fitting used in the present invention.
FIG. 18 is a cross-sectional view in the transverse direction showing a modification of the fabric foundation of the third embodiment of the present invention.
FIG. 19 is a transverse cross-sectional view showing a fabric foundation according to a fourth embodiment of the present invention.
FIG. 20 is a plan view showing a PC side wall in the embodiment of the present invention.
FIG. 21 is a front view showing a PC side wall in the embodiment of the present invention.
22 is a cross-sectional view of a PC side wall as viewed in the direction of arrows XX and YY in FIG. 21.
FIG. 23 is a front view showing a lower ladder-type reinforcing bar according to a fifth embodiment of the present invention.
FIG. 24 is a partial cross-sectional view showing a connection portion between the PC side wall and the lower ladder-shaped reinforcing bar in the embodiment of the present invention.
FIG. 25 is a plan view showing an intermediate stage of the fabric foundation according to the fourth embodiment of the present invention.
FIG. 26 is a transverse sectional view showing a fabric foundation according to a fifth embodiment of the present invention.
FIG. 27 is a perspective view showing an intermediate stage of the fabric foundation according to the fifth embodiment of the present invention.
FIG. 28 is a perspective view of a fabric foundation showing a conventional technique.
29 is a cross-sectional view of the fabric foundation shown in FIG. 27. FIG.
FIG. 30 is a front view showing an example of a conventional PC foundation beam member.
FIG. 31 is a plan view showing an example of a conventional PC foundation beam member.
FIG. 32 is a cross-sectional view showing an example of a joint portion of a conventional PC foundation beam member.
FIG. 33 is a plan view showing the shape of a conventional PC foundation beam member.
[Explanation of symbols]
1 PC foundation beam member
1a Terrace
3 Foundation version
4 Provisional hardware
5 PC side wall
6 Lower ladder type reinforcing bars
7 Prop
8 Long bar
8a Incisor
8b rebar
9 Upper ladder rebar
11 Horizontal rebar
11a Throw nut
12 Receiver (Fitting)
13 Hand (Fitting)
14 pin
15 Stop plate
16 nuts
17 Vertical groove
18 depression
19 Bulkhead
20 Notched surface
21 Pattern groove
22 Horizontal groove
23, 24 Embedded nut
25 Connection gap
31 Insertion groove
32 horizontal bolts
33 Protrusion
34 Horizontal groove
35 cotters
41 Lower plate
42 Top plate
43 legs
44 Horizontal streaks
45 volts
51 Bottom flange
52 Vertical flange
53 Protrusion
54 round holes
55 Cotta groove
56 Thin section
61 Upper chord
62 Lower chord material
63 Connecting bars
64 Pipe member
65 nuts
C concrete
D space
H Superstructure
L flooring
M block
P formwork
S sand

Claims (12)

Front surface and back surface in landscape rectangular shape, parallel in the thickness is equal to or less than the height of the rectangular parallelepiped PC foundation beam member (1), above and below the bottom of the PC foundation beam member (1) The horizontal reinforcing bar (11) embedded with a predetermined cover thickness is provided, and both side portions of the vertical groove (17) provided in the vertical direction at the center of the horizontal end face of the PC foundation beam member (1) are provided. In the height direction centering on the position of the horizontal rebar (11), the PC foundation beam member (1) has a thin partition wall (19) on the front and back sides, and a recess (18) inside the partition wall (19). PC foundation beam member characterized by forming. PC based division PC foundation beam portions several Zaifuku was divided into two right and left PC foundation beam member (1) according to the longitudinal direction center to claim 1, ing connected at right angles to one another at the dividing position Beam member.   The PC foundation beam member according to claim 1 or 2, wherein a buried nut (23) is embedded in the bottom of the PC foundation beam member (1).   The PC foundation beam member according to any one of claims 1 to 3, wherein an embedded nut (24) is embedded in a side surface of the PC foundation beam member (1).   The PC foundation beam member according to any one of claims 1 to 4, wherein the PC foundation beam member (1) has a horizontal groove (22) in a horizontal direction at a lower portion of the front surface and the back surface of the PC foundation beam member (1).   The PC foundation beam member according to any one of claims 1 to 5, wherein a terrace (1a) slightly higher than this is provided on the upper surface of the PC foundation beam member (1).   Attach joints (12, 13) to both ends of the horizontal rebar (11), and cut out the partition on either the front or back side of the PC foundation beam member to be connected at the horizontal end face to form an opening in the connection part 7. A method for connecting PC foundation beam members according to claim 1, wherein a pin is driven into the joint from the opening.   The ground where the insertion groove (31) is formed in the center in the longitudinal direction, and the foundation plate (3) provided with the horizontal bolt (32) toward the insertion groove (31) perpendicularly to the both sides of the insertion groove (31) The PC foundation beam member (1) according to any one of claims 1 to 6 is laid in a vertical posture in the fitting groove (31), and a foundation plate (3) is formed by the horizontal bolt (32). ) To form an inverted T-shaped fabric foundation. The soil was Excavation, corresponds to the thickness of the mat foundation arranged temporary supporting member on its bottom surface, to be pouring a PC foundation beam member according to any one of the temporary supporting to no 請 Motomeko 1 member 6 A concrete fabric foundation construction method in which a solid foundation concrete is cast while being temporarily received at a height, and a PC foundation beam member and a solid foundation are joined together to form an inverted T-shaped fabric foundation. The temporary supporting member, and a lower plate, according a leg for supporting the upper plate attached to the bottom plate, to claim 9 is made of an anchor bolt which projects upwardly through the upper plate concrete Construction method for fabric foundation. What the temporary receiving member, consisting of a lower plate, and an anchor bolt joining the head to the upper surface of the lower plate, and a nut which is screwed to the anchor bolt, and an upper plate bonded to the upper surface of the nut The method for constructing a concrete cloth foundation according to claim 9.   After cutting the ground, a pair of L-shaped PC side walls are laid horizontally on the bottom surface with the bottom flanges facing each other in parallel and in the longitudinal direction, and inside the opposite PC side walls. The PC foundation beam according to any one of claims 1 to 6, wherein the lower ladder-type reinforcing bars are arranged at an appropriate interval in a direction crossing the PC and connected to the PC side walls on both sides, and near the center of the lower ladder-type reinforcing bars. Standing in a vertical position while connecting the members in the longitudinal direction, placing concrete on the inner surface of the PC side wall, and connecting the placed concrete, the PC foundation beam member, and the PC side wall together, is an inverted T-shape. A method for constructing a concrete fabric foundation, characterized by forming a fabric foundation.

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