JP2006057351A - Pc foundation beam member and connection structure thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the workability and appearance of a continuous footing and a mat foundation formed of PC foundation beam members, and to improve the strength of the same against vertical load. <P>SOLUTION: The PC foundation beam members each have axial bolts 14 vertically embedded therein at both ends thereof, and therefore upper ends and lower ends of the axial bolts 14 are protruded from upper surfaces and lower surfaces of the PC foundation beam members 1 adjoining each other. Then an upper connector 4 and a lower connector 5 are placed onto the upper and lower ends of the respective axial bolts 14 in a manner being astride the upper surfaces and lower surfaces adjoining each other, and they are clamped by nuts to connect the PC foundation beam members to each other, followed by inserting an engaging member 9 into a recess 20 formed in the center of end faces of the respective beam members, as a wedge. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fabric foundation using a foundation beam member made of precast concrete (hereinafter abbreviated as PC) produced by factory production, or a PC foundation beam member in a solid foundation, and a connection structure thereof.

  In recent years, fabric foundations that use PC foundation beam members produced in factories to minimize cast-in-place concrete on the foundations of buildings such as houses and offices, shorten the construction period and increase the reliability of the foundations. Or, basic structures such as solid foundations are widely adopted.

  For example, FIG. 15 is a front view showing an example of a PC foundation beam member described as a conventional technique in Patent Document 1, and FIG. 16 is a plan view of the same. The PC foundation beam member 1a is a rectangular parallelepiped having a rectangular long side at the bottom and a short side as a height, and having a thickness equal to or less than the short side, and is separated from the outer surface by at least a predetermined cover thickness. The bar arrangements such as the horizontal reinforcement 15 and the stirrup 16 connecting them are embedded in the vertical direction at two positions, and joints 19a and 19b having pin holes are attached to both ends of the horizontal reinforcement 15. The joints 19a and 19b protrude from a longitudinal groove 17 formed vertically in the center of the horizontal end face of the PC foundation beam member 1 in the thickness direction. One joint 19a is a receiver in which a steel plate having a pin hole is divided into two pieces. The other joint 19b is a handle made of one steel plate having the same shape, and the adjacent PC foundation beam member is inserted by inserting a pin with the joint 19b inserted between the two steel plates of the joint 19a. 1 are connected to each other. After the connection, mortar is injected and filled in the gaps of the connecting portions.

  FIG. 17 is a front view showing a PC foundation beam member 1b described in Patent Document 1, and FIG. 18 is a perspective view showing a connection structure of the PC foundation beam member 1b. The shape of the PC foundation beam member 1b is the same as that shown in FIGS. 15 and 16, but rod-shaped embedded hardware 18 having bolt holes is embedded inside each corner portion of the front four corners. In this manner, the upper connecting metal 4 and the lower connecting metal 5 are assigned to the connecting portion of the PC foundation beam member 1b, and the adjacent PC foundation beam members are connected by screwing bolts.

In addition, in the following Patent Document 2, the present applicant has proposed a connection structure in which the upper connection hardware 4 is covered with a bolt from the upper side of the PC foundation beam member.
JP-A-9-287152 Japanese Patent Application No. 2003-270031, etc.

  By the way, the connection structure demonstrated in FIG.15, 16 described in patent document 1 has the problem that since it uses mortar, there are restrictions in construction in a cold region, and disassembly and reuse are difficult.

  In addition, the connection structure described with reference to FIGS. 17 and 18 is not only obstructive because the dimensions of the connection hardware 4 and 5 at the foundation portion of the building tend to be large, and bolting work is not performed on both the inside and outside of the foundation. There is a problem that workability is poor.

  The connection structure described in Patent Document 2 also has a problem that the shear strength is insufficient when a non-uniform vertical load is applied to adjacent PC foundation beam members.

  An object of the present invention is to eliminate such problems in the prior art and to realize a basic connection structure that is excellent in workability and aesthetics.

  The PC foundation beam member for a cloth foundation or a solid foundation according to the present invention is a rectangular parallelepiped PC foundation beam member having a rectangular 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 shaft bolt is embedded in the vertical direction at a position separated from the outer surface near the both ends by at least a predetermined cover thickness, connected to the horizontal reinforcement in a plurality of vertical stages, and the upper and lower ends of the shaft bolt are connected to the PC foundation. PC foundation beam members for fabric foundations or solid foundations protruding from the upper and lower notches of the beam member, and a vertical groove penetrating vertically at the center position in the thickness direction of both end faces, and also the center in the height direction of both end faces The portion is characterized by being provided with a narrower recess than the thickness of the PC foundation beam member centered on the longitudinal groove.

  A PC foundation beam member for a fabric foundation or a solid foundation according to the present invention has a shape in which a plurality of PC foundation beam members, or a plurality of PC foundation beam members having a length approximately half of the above, are joined in a direction perpendicular to each other. is there.

  The connection structure of the PC foundation beam member for the cloth foundation or the solid foundation according to the present invention connects the adjacent PC foundation beam member while inserting a columnar engagement material into the recess, At the upper and lower ends of the shaft bolt protruding from the lower notch, the upper connection metal and the lower connection metal are applied across these upper and lower notches, and a long bolt penetrating the longitudinal groove and the engaging material is further connected to the connection part. Inserting and fastening the shaft bolt and the long bolt with a nut, respectively, preferably the above-mentioned cloth foundation or solid foundation in which the upper connection hardware is provided with a connection hole in an angle steel or a groove steel This is a connection structure of PC foundation beam members.

  The fabric foundation or solid foundation construction method according to the present invention is based on the ground shape in the form of a groove, and a PC foundation slab with an insert nut embedded in the center of the top surface is laid on the bottom surface, and the connection structure is connected thereon. The PC foundation beam member is placed so that the connecting portion comes to the position of the insert nut, and the longitudinal groove on the end face of the PC foundation beam member, the engagement material, and the upper and lower connection hardware are inserted long. The connecting bolt is inserted and screwed into the insert nut in the center of the PC foundation plate and tightened, or the ground is rooted in a groove shape, and support bases are arranged at predetermined intervals on the bottom surface. The PC foundation beam member connected by the connection structure is placed thereon, and the lower end of each axial bolt is fixed to the support base via a long nut. End face A long connection bolt that passes through the groove, the engagement material, and the upper and lower connection hardware is inserted and fixed to the support base, and the PC base beam member is provided below the PC base beam member including the support base. It is a construction method of a cloth foundation or a solid foundation characterized in that the concrete is cast to a height at which the lower end of the foundation is buried.

  According to the present invention, not only the aesthetics of the foundation part is improved with the workability in the foundation work, but also the excellent effect that the shear strength at the connection part of the foundation beam member is increased and the strength of the entire foundation is improved. Play.

  According to the present invention, axial bolts are embedded in the vertical direction in the vicinity of both ends of the PC foundation beam member, and for the adjacent PC foundation beam members, the shaft bolts are connected to the upper and lower surfaces of the PC foundation beam member with the connecting hardware. Since a column-shaped engaging material is inserted into the recess and the adjacent PC foundation beam members are connected to construct a fabric foundation or a solid foundation, not only the appearance and workability are good but also reused. Even in this case, disassembly is easy, and the shear strength is improved by the wedge effect of the engagement material.

Example 1
A first embodiment of the present invention will be described with reference to FIGS. 1 is a front view showing a PC foundation beam member 1 of the embodiment, FIG. 2 is a plan view, FIG. 3 is a partial perspective view showing a part thereof, 1 is a PC foundation beam member, and 10 is applied to the surface. 11 is a stepped portion formed in the center of the upper surface, 12 is an insert nut for anchor bolts embedded in the stepped portion 11, and 12a is a horizontal insert nut for a solid foundation embedded in the lower center of both sides. , 13 is a horizontal groove formed at the bottom of both side surfaces, 14 is a shaft bolt embedded in the vertical direction near both ends of the PC foundation beam member 1, and 15 is locked to the shaft bolt 14 on both sides and is horizontally raised and lowered in two steps. The horizontal reinforcing bars 16 are arranged at the upper and lower horizontal connecting bars 15 and 17 are longitudinal grooves formed at the center positions in the thickness direction of both end faces. The decorative groove 10 may be provided only on the outer surface of the foundation or may not be provided. The configuration so far is basically the same as the conventional one described so far.

  In the present invention, in addition to the above-described configuration, as shown in FIGS. 1 to 3, in the center part in the height direction of both end faces of the PC foundation beam member 1, a hollow part centered on the longitudinal groove 17 at the center in the thickness direction. 20 is provided.

FIG. 4 is a partial perspective view showing a state in which the upper connection hardware 4 and the lower connection hardware 5 are applied to one end of the PC foundation beam member 1 shown in FIG. 3. As shown in this figure, the upper connecting metal 4 may be formed by cutting equilateral angle steel and providing a bolt hole for connection on one side, or by cutting groove steel and providing a bolt hole on the web. . By using such a shape steel as the upper connection metal fitting 4, there is an effect that the shear strength of the connection portion is improved since the longitudinal rib exists in the connection portion. In the case where there is a possibility that the concrete may be damaged due to the concentrated force acting on the lower edge portion of the upper connection hardware 4, the horizontal flange indicated by reference numeral 41 in FIG. 4 may be reinforced by welding.
On the other hand, it is sufficient for the lower connecting metal 5 to be a steel strip (flat steel) provided with bolt holes. The upper connection metal 4 and the lower connection metal 5 are preferably subjected to rust prevention treatment such as painting.

  In the present invention, the upper connection metal 4 and the lower connection metal 5 need another bolt hole at the center in addition to the bolt holes inserted into the axial bolts 14 on both sides. This is for inserting the long bolt 32 of the connecting portion, which will be described in detail later.

  When the lower notch 17a is formed in the portion from the lower end of the PC foundation beam member 1 into which the lower connection hardware 5 is inserted, as shown in FIG. 1, it is convenient to apply a spanner. After completion of the tightening work, it is convenient for future dismantling work to insert a solid moisture-proof material such as expanded polystyrene into the lower notch 17a so that cast-in-place concrete does not enter.

  When the upper connection hardware 4 is a grooved steel, the ribs can be seen on both the inside and outside of the foundation. However, in the case of an angle steel, if the vertical rib is the inside of the foundation as shown in FIG. Is almost aesthetically pleasing. Even in the case of a grooved steel with visible ribs, the aesthetics are improved because the area of the hardware visible from the outside is much smaller than in the conventional case shown in FIG. The lower connection hardware 5 cannot be seen at all from the outside.

  FIG. 5 is a perspective view showing an example of the engaging member 9 to be inserted into the hollow portion 20 described above. In this example, it is a cylindrical shape, but may be a prismatic shape. The shape of the recess 20 is matched to the engagement material 9. A through hole 91 through which the long bolt 32 passes is provided at the position of the central axis of the engaging member 9. Since the engaging member 9 is a strength member, it is preferable to use metal or concrete.

  After the engaging member 9 is inserted into the adjacent recesses 20 on both sides, the upper connecting metal 4 and the lower connecting metal 5 are attached to the shaft bolt 14, and the long bolt penetrating the vertical groove 17 and the engaging material 9 in the connecting part. The PC foundation beam member 1 is connected by inserting 32 and tightening nuts (not shown) to the axial bolts 14 and the long bolts 32 on both sides.

  Next, the support structure of the PC foundation beam member when constructing a cloth foundation or a solid foundation using the PC foundation beam member 1 will be described. FIG. 6 is a perspective view of the PC foundation 3. An insert nut 31 is embedded in the center of the upper surface. Reference numeral 33 denotes a side recess provided on each side in the connection direction.

  FIG. 7 is a partial front view showing a fabric foundation of an embodiment using this PC foundation 3. In this embodiment, the PC foundation beam member 1 and the PC foundation plate 3 have the same length and are shifted by a half pitch position so that the insert nut 31 is directly below the connecting portion of the PC foundation beam member 1. After the engagement member 9 is inserted into the recess 20, the upper and lower parts of the PC foundation beam member 1 are connected by the upper connection metal 4 and the lower connection metal 5, and the length formed by the longitudinal grooves 17 on both end faces of the PC foundation beam member 1. The long foundation bolt 32 is inserted through the hole and the through hole 91 of the engaging member 9 and the tip thereof is screwed into the lower insert nut 31, and the upper end of the long bolt 32 is tightened with the nut to complete the fabric foundation. The connecting portion may be filled with mortar or may not be poured. It is more convenient not to use mortar, especially if there is a possibility that this foundation will be dismantled and reused in the future. When the PC foundation 3 is used and cast-in-place concrete is not used as in this embodiment, the horizontal groove 13 of the PC foundation beam member 1 is not particularly necessary.

  When the concrete is hardened and the inverted T-shaped fabric foundation is completed, the anchor bolt A is screwed into the insert nut 12 at the top of the PC foundation beam member 1 and the base S is attached to the upper surface, and the construction is shifted to the upper construction. If the stepped portion 11 is provided on the upper surface of the PC foundation beam member 1 as shown in FIG. 1, if the base S is placed as shown in FIG. The

  Note that the side depression 33 of the PC foundation does not need to be provided, but if it is provided, a long hole having a circular cross section or the like is formed in the connection portion, and therefore the engagement material 9 similar to the above is formed therein. Is preferable because the shear strength of the PC foundation 3 is improved. The cross-sectional shape of the side recess 33 is, for example, a semicircular shape, but is not limited to this, and may be a triangle (a rhombus that matches both sides).

  As an example of the dimensions, the long side of the PC foundation beam member 1 is 1000 mm, the short side, that is, the height is 550 mm, the upper clasp portion is 40 mm, the thickness is 120 mm, and the diameter of the cylindrical engagement member 9 is 70 mm. The long bolt 32 inserted in the center is M24. The thickness of the PC foundation 3 is 150 mm, and the radius of the side depression 33 is 70 mm, which is the same as that of the depression 20 of the PC foundation beam member 1.

Example 2
In place of the PC foundation 3 in the first embodiment, a simple support base can be used.

  FIG. 8 is a perspective view showing an example of a support base. The support base 2a is manufactured by assembling bolts and reinforcing bars. A nut 22 is inserted into the support bolt 21. A vertical base bar 24 is attached to the lower end of the vertical support bolt 21, and a vertical construction bar 23 is attached to the middle height by spot welding or the like. FIG. 9 shows a modification of the support base of FIG. 8. This support base 2b uses a support plate 25 of resin, wood, steel plate or the like instead of the base 24 of the support base 2a of FIG. This joining is performed by adhering a nut to the surface of the support plate 25. Furthermore, the construction bar 23 is also welded to the side surface of the nut to facilitate the vertical adjustment.

  FIG. 10 is a cross-sectional view of the fabric foundation at the position of the axial bolt 14 showing an example of construction of the fabric foundation using the PC foundation beam member 1 and the support base 2a. The ground of the foundation part is rooted in a groove shape and a base plate 6 is laid on the bottom surface. The connection structure of the PC foundation beam member 1 is as described in the first embodiment. As for the lower part, as shown in FIG. 4, the lower connecting metal 5 is applied to the protruding part of the shaft bolt 14 of the adjacent PC foundation beam member 1, and this is tightened with the long nut 26, and then the lower part of the long nut 26 is For example, the support bolt 21 of the support base 2a shown in FIG. 9 is screwed, the height is adjusted by the nut 22, and this is placed on the base plate 6. Similarly, the long bolt 32 of the connecting portion is supported by the support base via the long nut. When the laying of the PC foundation beam member 1 is completed, the cast-in-place concrete 7 for the foundation slab portion is placed by appropriately forming a formwork. Since the horizontal groove 13 is formed in the lower portion of the side surface of the PC foundation beam member 1, the height at which it cannot be seen is used as a guide for placement. Further, when the concrete 7 enters the horizontal groove 13, the connection between the concrete 7 and the PC foundation beam member 1 is further strengthened.

  In addition, if the thing (2b) with the support plate 25 shown in FIG. 9 is used as a support stand, the lower base plate 6 can also be abbreviate | omitted. In addition, a concrete block with a concrete block cut in half can be used.

  FIG. 11 is a cross-sectional view showing a modification of the second embodiment. The cross-sectional position is the center of the PC foundation beam member 1, and the support base 2a does not appear in this cross section. The foundation to be constructed is a solid foundation, and a horizontal stabilizer 81 is connected to the lateral insert nut 12a. Reference numeral 12b denotes a lower surface insert nut, and B denotes a lower bolt screwed into the nut, which further adheres to the concrete 7.

Example 3
Each of the embodiments has been described on the assumption that the foundation is straight and long. However, in an actual foundation, a shape other than a simple straight line is required at the corner of the building, the connecting portion of the inner wall, or the like. FIG. 12 is a plan view showing a modified example of such a PC foundation beam member 1. The PC foundation beam member 1a in FIG. And The PC foundation beam member 1b of (b) is an L-shaped member used for a corner portion, and is formed by connecting members having a length half of 1a at right angles to each other. 1c of (c) is a T-shaped one used for the inner wall connecting portion or the like, and a half length of the one shown in 1a is connected in a perpendicular direction. Further, 1d shown in (d) is a cross shape used for the foundation of the crossing portion of the wall, etc., which is a shape in which four pieces having a length half as long as 1a are connected in a direction perpendicular to each other. Reference numeral 14 denotes each shaft bolt. Of these, 1b of (b) is unstable and may float if only the end is supported. Insert an auxiliary nut 14a into the lower surface of the corner or the lower side of the corner and screw in the auxiliary bolt 14a. It is preferable to take measures such as bolting and connecting to the foundation part.

Example 4
FIG. 13 is a partial perspective view showing a modified embodiment of the PC foundation beam member 1. Up to now, it has been described that the recessed portions 20 are provided on both end faces of the PC foundation beam member, and the engaging material 9 is inserted into the both ends when connecting, but the engaging material 9 is embedded in one end face and integrated. This is the same, and the expression “providing the recessed portions 20 at both end faces and inserting the engaging member 9 into the connection when connecting” includes the expression as shown in FIG. However, since the directivity is generated in the PC foundation beam member 1 in this way, some care is required for the construction.

  FIG. 14 is a conceptual diagram showing an outline of a shear load test of two connected PC foundation beam members. A load is applied so as to be asymmetric with respect to the connecting portion, and the fracture strength and displacement (displacement) are measured. Compared with the conventional one in which no engaging material is inserted, the product of the present invention showed good results in both yield strength and displacement.

  In each of the above embodiments, the case where the depression 20 and the engagement member 9 are one in the center in the height direction has been described. However, for example, when the beam height is large, these are divided into upper and lower parts. This is optional and is within the scope of the present invention.

It is a front view which shows the PC foundation beam member in 1st Example of this invention. It is a top view which shows the PC foundation beam member in 1st Example of this invention. It is the fragmentary perspective view which looked at some PC foundation beam members in the 1st example of the present invention from the inside. It is a fragmentary perspective view which shows the state which applied the upper and lower connection metal fittings to the PC foundation beam member of FIG. It is a perspective view which shows an example of the engaging material in this invention. It is a perspective view which shows an example of the foundation in the Example of this invention. It is a partial front view which shows the construction example of the fabric foundation in 1st Example of this invention. It is a perspective view which shows an example of the support stand in the 2nd Example of this invention. It is a perspective view which shows the modification of the support stand in the 2nd Example of this invention. It is sectional drawing which shows the construction example of the fabric foundation in 2nd Example of this invention. It is sectional drawing which shows the construction example of the solid foundation in 2nd Example of this invention. It is a top view which shows the modification of the PC foundation beam member in this invention. It is a fragmentary perspective view which shows the modification of the PC foundation beam member in this invention. It is a conceptual diagram which shows the loading test of the PC foundation beam member in this invention. It is a front view which shows an example of the PC foundation beam member in a prior art. It is a top view which similarly shows an example of the PC foundation beam member in a prior art. It is a front view which shows the other example of the PC foundation beam member in a prior art. It is a perspective view which shows the connection structure of the PC foundation beam member in the prior art shown in FIG.

Explanation of symbols

1, 1a, 1b PC foundation beam member 2 (2a, 2b) Support base 3 PC foundation plate 4 Upper connection hardware 5 Lower connection hardware 6 Base plate 7 Cast-in-place concrete 9, 9a Engagement material
10 Makeup groove
11 Stepped part
12, 31 Insert nut
12a Horizontal insert nut
12b Bottom insert nut
13 Horizontal groove
14 shaft bolt
14a Auxiliary bolt
15 Horizontal reinforcement (loop reinforcement)
16 Stirrup
17 Vertical groove
17a Lower notch
18 Embedded hardware
19a, 19b fitting
20 depression
21 Support bolt
22 Nut
23 Construction reinforcement
24 muscles
25 Support plate
26 Long nut
32 Long bolt
33 Side recess
41 Horizontal flange
81 Stabilizing muscle
91 Through hole A Anchor bolt B Lower bolt P Solid moisture-proof material S Base V Underfloor vent

Claims (6)

A rectangular parallelepiped PC foundation beam member (1) having a rectangular long side as a bottom and a short side as a height and having a thickness equal to or less than the short side, and at least a predetermined cover from outer surfaces near both ends Shaft bolts (14) are embedded in the vertical direction at positions separated by a thickness and connected to horizontal reinforcements (15) in a plurality of vertical stages, and the upper and lower ends of the shaft bolt (14) are connected to the PC foundation beam member (1 PC foundation beam members for fabric foundations or solid foundations protruding from the upper surface and lower notch (17a) of
A longitudinal groove (17) penetrating vertically is provided at the center in the thickness direction of both end faces, and the PC foundation beam member (1) centering on the longitudinal groove (17) is also provided at the center in the height direction of both end faces. A PC foundation beam member for a fabric foundation or a solid foundation, characterized in that a narrow depression (20) is provided rather than the thickness. A PC foundation beam member for a cloth foundation or a solid foundation formed by joining a plurality of PC foundation beam members (1) according to claim 1 or a plurality of PC foundation beam members having a substantially half length thereof in a direction perpendicular to each other. The adjacent PC foundation beam member (1) is connected to the recess (20) while inserting the columnar engaging material (9), and protrudes from the upper and lower notches (17a) of the PC foundation beam member (1). The upper connecting metal (4) and the lower connecting metal (5) are applied to the upper and lower ends of the shaft bolt (14) extending over these adjacent upper and lower notches (17a), and the vertical groove (17 ) And a long bolt penetrating the engaging member (9), and the shaft bolt (14) and the long bolt (32) are each tightened with a nut. Connection structure for PC foundation beam members for solid foundations. The connection structure of the PC foundation beam member for cloth foundations or solid foundations according to claim 3, wherein the upper connection hardware (4) is provided with a hole for connection in angle steel or grooved steel. Claims 1 or 2 wherein the ground is rooted in a groove shape and a PC foundation slab with an insert nut embedded in the center of the top surface is laid out on the bottom surface, and connected by the connection structure according to claim 3 or 4 The PC foundation beam member described above is placed so that the connecting portion comes to the position of the insert nut, and a long connection is inserted through the longitudinal groove on the end face of the PC foundation beam member, the engagement material, and the upper and lower connection hardware. A method for constructing a cloth foundation or a solid foundation, wherein a bolt is inserted and screwed into an insert nut in the center of the PC foundation plate and tightened. The PC foundation beam member according to claim 1 or 2, wherein the ground is rooted in a groove shape, support bases are arranged on the bottom surface thereof at predetermined intervals, and the base is connected thereto by the connection structure according to claim 3 or 4. The lower end of each axial bolt is fixed to the support base via a long nut, and the vertical groove on the end face of the PC foundation beam member, the engagement material, and the upper and lower connection hardware are connected at the connection portion. A long connecting bolt to be inserted is inserted and fixed to the support base, and the concrete is driven to a height where the lower end portion of the PC foundation beam member is buried under the PC foundation beam member including the support base. How to construct a cloth foundation or solid foundation.

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