JP2002309591A - Structure for joining pile head to steel footing beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for joining a pile head to a steel footing beam capable of reducing the labor required for on-site work, while taking up errors in the work of joining the pile head to the beam. SOLUTION: A male joint fitting 12 attached to each end of the steel footing beam 4 is slid from its top and inserted, on-site, into a female joint fitting 11 attached to a side face of the head of a foundation steel pipe pile 3 erected on a base, and a space within the female joint fitting is filled with mortar to join the pile head to the footing beam, whereby errors in the work of joining the pile head to the steel footing beam can be taken up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a joint structure between a foundation and a steel underground beam in foundation construction.

[0002]

2. Description of the Related Art Conventionally, when constructing a foundation and a steel underground beam, a trench connecting to both piles is excavated after the pile is erected and between the adjacent piles, and a wooden frame and a reinforcing bar are formed in the periphery and the trench. Is installed and concrete is cast to provide the foundation of the reinforced concrete structure and steel underground beams. (Prior Art 1) Also, for example, in Japanese Patent Application Laid-Open No. Hei 9-268573, a leg portion to be inserted into an upright stake is formed below the ground, having a joint portion to which a pillar is joined at the upper portion. A foundation for connecting a column and a steel underground beam after inserting a member having a column and a plurality of beams horizontally attached to the column into a pile, filling concrete, and connecting the column and a steel underground beam. The invention relating to the joining structure of (1) is disclosed. (Prior art 2)

[0003]

However, in the above-mentioned conventional foundation and steel underground beam joint structure, in the case of the prior art 1, footing and the construction space of the worker for constructing the steel underground beam are required. After excavating and transporting a huge amount of earth and sand to secure it, it was necessary to install a formwork and cast concrete, so the construction period was long and the workability was poor. Also,
In the case of the prior art 2, although excavation and concrete work are reduced, the accuracy of building members into piles is required, and the members and columns, and steel underground beams are welded or bolted on site. Connecting work occurred, and the workability at the site was poor.

The present invention solves the above-mentioned problems of the prior art, and can reduce the labor required for on-site construction, and can also absorb the joint construction error between the pile head and the steel underground beam. It is an object of the present invention to provide a joint structure for underground beams.

[0005]

In order to solve the above-mentioned problems, the present invention is configured as follows. The first invention is
Slide the male fittings attached to both ends of the steel underground beam from above into the female fittings attached to the pile head side of the foundation steel pipe pile erected on the ground,
It is characterized in that the head of the pile and the steel underground beam are joined by filling the mortar into the void in the female joint.

According to a second aspect of the present invention, male joint fittings attached to both ends of a steel underground beam are slid from above in a site into slits formed on the side of a pile head of a foundation steel pipe pile erected on the ground. It is characterized in that the pile head is connected to the steel underground beam by inserting and filling the foundation with concrete.

A third aspect of the present invention is characterized in that a steel pipe having an inner projection with a diameter larger than the diameter of the pile having the structure according to the first or second aspect is provided outside the pile head of the foundation steel pipe pile. A fourth invention is characterized in that the female joint fitting of the first invention uses a small-diameter steel pipe provided with a slit or a shaped steel. A fifth invention is characterized in that the male joint fitting of any one of the first to fourth inventions uses a steel plate obtained by welding an H-shaped steel, a T-shaped steel, a Y-shaped steel, and a stud dowel.

According to a sixth aspect of the present invention, there is provided a male joint fitting according to any one of the first to fifth aspects, wherein a load acting on the joint is transmitted by a continuous member, or the male joint is separated into two upper and lower parts, and It is characterized in that, by being connected to a beam, the overturning moment acting on the joint is converted into axial force on the upper and lower male joint fittings to transmit the load.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. In FIG. 1, 1
Is a substructure provided in the ground, comprising a plurality of steel pipe piles 3 installed in the ground in an arrangement as shown in FIG. 2 and a steel underground beam 4 connecting the steel pipe piles 3 to each other. It is configured.
Reference numeral 2 denotes an upper structure built on the lower structure 1.

FIGS. 3 and 4 are a schematic sectional view and a plan view, respectively, of an embodiment of the lower structure of the present invention. Female joint fitting 11 machined and attached to pile head 71 of standing steel pipe pile 3
Next, a structure is shown in which the pile head 3 and the steel underground beam 4 are joined by inserting the steel underground beam 4 having the male joint fitting 12 at the tip and filling the inside with the mortar 21.

FIG. 5A shows a concrete example of the female joint fitting 11 formed on the pile head 71 of the steel pipe pile 3. The female joint fitting 11 is formed so that the male joint fitting 12 can be inserted therein, and is attached in a direction in which the steel underground beam 4 is installed. As the internal area of the female joint fitting 11 is larger, the construction accuracy of the pile head 71 and the steel underground beam 4 can be absorbed. In addition, a mortar 2 to be filled in the female joint after inserting the male joint metal 12 is provided at the bottom of the female joint metal 11.
It is desirable that the leakage preventing plate 13 is fixed so that the leakage preventing member 1 does not leak. The steel pipe pile 3 is not limited to the illustrated one and may be a square steel pipe pile or an H pile.

FIG. 5 (b) shows the outer side of the pile head of the steel pipe pile 3,
This is a basic type in which a steel pipe 6 with an inner projection with a diameter larger than the diameter of the pile is installed, concrete 22 is filled in the inside, and the pile 3 and the steel pipe 6 with the inner projection are joined.
A specific example of the female joint fitting 11 machined in FIG. The female joint fitting 11 is machined so that the male joint fitting 12 can be inserted therein, and is attached in a direction in which the steel underground beam 4 is installed. As the internal area of the female joint fitting 11 is larger, the construction accuracy of the pile head 71 and the steel underground beam 4 can be absorbed. A leakage prevention plate 13 is arranged at the bottom of the female joint fitting 11 so that the mortar 21 filling the female joint does not leak. Compared with (a), this foundation type has a feature that the steel pipe pile 3 can be absorbed by installing the steel pipe 6 with the inner surface projection after the steel pipe pile 3 is erected.

As shown in FIG. 6, the female joint fitting 11 is
The small-diameter steel pipe 41 shown in (a) is provided with a slit 42, or two equilateral angle irons 44 are appropriately fixed to the steel pipe pile 3 or the steel pipe 6 with inner projections in the form shown in (b) and (c). You may use it. A joining steel plate 43 can be welded to the small-diameter steel pipe 41 in (a) so that welding to the steel pipe pile 3 or the steel pipe 6 with the inner surface projection is simplified.

Next, still another embodiment of the present invention is shown in plan and sectional views of FIGS. In this example, the steel underground beam 4 to which the male joint fitting 12 having the H-shaped cross section is fixed at the tip is inserted into the slit 51 formed in the side axial direction of the pile head 71 of the erected steel pipe pile 3, This shows a structure in which concrete 22 is filled in a steel pipe pile 3 and a pile head 71 and a steel underground beam 4 are joined.

FIG. 9 (a) shows the processing state of the slit 51 inserted in the steel pipe pile 3 at this time. The slit 51 is cut so that the male fitting 12 can be inserted, and is provided in the direction in which the steel underground beam 4 is installed. The steel pipe pile 3 may be a square steel pipe pile. FIG. 9 (b) shows the steel pipe pile 3 and the steel pipe 6 with inner projections, in which the steel pipe 6 with an inner projection with a diameter larger than the pile diameter is installed outside the steel pipe pile 3, and the concrete 22 is filled inside the steel pipe 6 with the inner projection. And shows a processing state of a slit 51 inserted in the steel pipe 6 with the inner surface projection. The slit 51 is machined so that the male joint fitting 12 can be inserted, and is attached in a direction in which the steel underground beam 4 is installed. This foundation type is different from (a) in that the steel pipe pile 3
There is a feature that the construction accuracy of the pile 3 can be absorbed by installing the pile 3.

FIG. 10 shows a specific example of the male joint fitting 12 formed at the tip of the steel underground beam 4. The male joint fitting 12 is welded directly to the end of the steel underground beam 4, or the male joint fitting steel plate 45 is welded via a male joint working steel plate 45 as necessary. When the height of the male joint fitting is larger than the height of the steel underground beam 4, the rib 46 is provided between the steel underground beam 4 and the male fitting 12 or the steel plate 45 for processing the male joint fitting. To process. Further, the male joint fitting 12 may be used as a continuous material as shown in FIG. 10A, or the upper member 1 as shown in FIG.
2a, the lower member 12b may be separated, and the tipping moment acting on the end of the steel underground beam 4 may be converted into a pushing force and a pulling force by a couple, thereby simplifying the design. The steel underground beam 4 may use a shape steel or a steel pipe.

The male fitting 12 can be inserted into the female fitting 11 and into the slit 51 as shown in FIG. 11, and can be an H-shaped member 61 as shown in FIG. A member 62, a Y-shaped member 63 as shown in FIG.
A member in which a stud dowel 65 is welded to a steel plate 64 as shown in (d) may be used. Also, the members shown in (a) to (c) may be welded with a stud dowel 65 if necessary, which has the effect of improving the adhesive strength between the male joint and concrete or mortar.

The male fitting 12 and the female fitting 1
By arranging two or more joints 1 in the plane direction as shown in FIG. 12, the overturning moment in the plane direction can be converted into a couple, and the stability of the joints can be increased. (A) is an example in which two T-type male fittings 12 are provided on the underground beam 4 and connected to the female fitting 11 made of a small steel pipe, and (b) is two T-types provided on the underground beam 4. An example is shown in which the male joint fitting 12 is directly inserted into and connected to a slit formed in the pile 3 or the steel pipe 6 having an inner surface projection.

The load transmission mechanism at the joint between the pile head 71 and the steel underground beam 4 as described above is as follows. Male joint 12
Is divided into upper and lower two parts, the overturning moment acting on the steel underground beam is converted as a couple force into the upper part 12a and the lower part 12b as a pushing force and a pulling force, and the mortar 21 → the female joint and the concrete 22 are converted. Through the pile 3 and the steel pipe 6 with the inner surface projection. In addition, the push-in spring value and the pull-out spring value can be adjusted according to the amount of steel material in the joint portion, and the rigidity of the entire joint can be adjusted.

[0020]

According to the present invention, on-site form work such as formwork and reinforcing steel work, or on-site work such as welding work can be labor-saving and simplified, and work can be performed in a short period of time. Furthermore, the gap in the female joint can absorb the construction error between the pile head and the steel underground beam, and the rigidity of the joint can be freely controlled by the amount of steel material of the joint.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view showing an example of the lower structure of FIG. 1;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is an explanatory view showing a processing state of a steel pipe pile, a steel pipe with inner projections, and a female joint fitting.

FIG. 6 is an explanatory view showing a planar shape of a female joint fitting.

FIG. 7 is a sectional view showing another example of the lower structure of FIG. 1;

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is an explanatory view showing a slit processing state of a steel pipe pile and a steel pipe with inner projections.

FIG. 10 is an explanatory view showing a processing state of a steel underground beam and a male joint fitting.

FIG. 11 is an explanatory view showing a planar shape of a male joint fitting.

FIG. 12 is an explanatory view showing a planar joint state between a pile head and a steel underground beam.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower structure 2 Upper structure 3 Steel pipe pile 4 Steel underground beam 6 Steel pipe with inner projection 11 Female joint fitting 12 Male joint fitting 12a Upper male joint fitting 12b Lower male joint fitting 13 Leakage prevention steel plate 21 Mortar 22 Concrete 41 Small diameter Steel pipe 42 Slit 43 Joined steel plate 44 Equilateral angle steel 45 Steel plate for processing male fittings 46 Rib 51 Slit 61 H-shaped steel 62 T-shaped steel 63 Y-shaped steel 64 Steel plate 65 Stud dowel 71 Pile head

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuzo Akashi 20-1 Shintomi, Futtsu-shi, Chiba Prefecture Nippon Steel Corporation Technology Development Division (72) Inventor Shinji Myonaka 20-1 Shintomi, Futtsu-shi, Chiba New Japan 2D046 CA08 2E125 AA46 AB01 AB10 AC15 AG03 AG43 BB36 CA91 EA33

Claims (6)

[Claims] 1. A male joint fitting attached to both ends of a steel underground beam is slid from above into a female joint fitting attached to a side face of a pile head of a foundation steel pipe pile erected on the ground. A joint structure between a pile head and a steel underground beam characterized by joining a pile head and a steel underground beam by filling mortar into a void in a female joint. 2. A male joint fitting attached to both ends of a steel underground beam is slid from the top at the site and inserted into a slit formed in a side of a pile head side of a foundation steel pipe pile erected on the ground. A joint structure between a pile head and a steel underground beam, characterized by joining the foundation and a steel underground beam by filling concrete into the inside. 3. A pile head and a steel underground beam according to claim 1 or 2, wherein a steel pipe with an inner projection having a diameter larger than the pile diameter is provided outside the pile head of the foundation steel pipe pile. Joint structure. 4. The joint structure of a pile head and a steel underground beam according to claim 1, wherein the female joint fitting is formed of a small-diameter steel pipe provided with a slit or a shaped steel. 5. The pile head according to claim 1, wherein the male fitting is made of a steel plate obtained by welding an H-section steel, a T-section steel, a Y-section steel, and a stud dowel. Structure of the steel part and the steel underground beam. 6. The male joint fitting acts on a steel underground beam end by transmitting a load acting on a joint with a continuous member or by separating the load into two upper and lower parts and connecting the same to a steel underground beam. The joint between the pile head and the steel underground beam according to any one of claims 1 to 5, wherein a load is transmitted by converting the falling moment to be applied to the upper and lower male joint fittings into an axial force. Construction.