JP2002309589A - Structure for joining foundation to footing beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for joining a foundation to footing beams being excellent in on-site construction properties and capable of reducing the period of construction work by eliminating the need for the formwork of a footing, the placement of footing beam concrete, and the work of joining the footing to the beams on-site. SOLUTION: A steel form member 8 comprising a member to which a steel plate 4 having joints at both ends of a steel underground form member 8 is welded is installed around a placed steel pipe pile 3 via the footing beam and filled with concrete 6 to construct a foundation and the footing beam. A stud connector 7 is provided on the concrete-filled surface of the steel plate 4 having the joints. Concrete work such as onsite formwork and reinforcing work, or onsite work such as welding, can be reduced and simplified to enable construction work to be accomplished in a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure between a foundation and an underground beam in the construction of a footing and an underground beam in the construction of a foundation.

[0002]

2. Description of the Related Art Conventionally, when constructing a footing and an underground beam, a trench that connects to both piles is excavated after the pile is erected and between adjacent piles, and a wooden frame and a reinforcing bar are arranged in the peripheral portion and the trench. Putting concrete and footing,
Underground beams are provided. (Prior Art 1) Also, for example, in Japanese Patent Application Laid-Open No. 9-268573, a leg portion to be inserted into an upright stake is formed under the ground and has a joint portion to which a column is joined at the upper portion. The present invention relates to a footing for connecting a pillar and an underground beam, and a method of constructing an underground beam, after inserting a member having a pillar and a plurality of beams horizontally attached to the pillar into a pile, filling concrete, and then connecting the pillar and the underground beam. The invention has been disclosed. (Prior art 2)

[0003]

However, in the above-mentioned conventional footing and underground beam construction method, the prior art 1
In the case of, it is necessary to secure the construction space for workers to build footing and underground beams, so it is necessary to excavate and transport a huge amount of earth and sand, install a formwork and cast concrete. The construction period was long and the workability was poor. Moreover, in the case of the prior art 2, although excavation and concrete work are reduced, the accuracy of building the members in the pile is required, and the members and columns, and underground beams are welded on site, or The work to connect with bolts occurred, resulting in poor on-site workability.

[0004] The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a joint structure between a foundation and an underground beam capable of saving labor on site.

[0005]

In order to solve the above-mentioned problems, the present invention is configured as follows. The first invention is
The head of the steel pipe pile is protruded from the ground or the excavation surface, and a steel form member having a diameter larger than the outer diameter of the steel pipe pile is arranged substantially coaxially around the protruding portion via a joint, and This is a structure in which concrete is filled into a form member to build a footing, and the steel form member is formed by welding a steel plate 4 having joints at both ends of a steel underground beam 5. It is characterized by having been done. In a second invention, the steel formwork member of the first invention has a shape in which a steel plate 4 having joints at both ends of a steel underground beam 5 is welded in a factory in advance, and the steel plate 4 having the joint is formed on site. It is characterized in that a steel formwork is built in combination with the above, and concrete is filled into the inside to form a footing. A third invention is characterized in that, in the joint structure according to the first or second invention, the steel plate having the joint is any one of a prepared steel sheet pile, a steel sheet pile, a steel pipe, and a steel sheet. According to a fourth invention, in the joining structure according to any one of the first to third inventions, a stud dowel 7 is welded to a concrete filling surface side of a steel plate having a joint, and the concrete and the steel form member are welded. It is characterized in that the adhesive force of the material is improved.

[0006]

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 lower structure provided in the ground, 2 is an upper structure built on the lower structure 1, and a plurality of lower structures 1 (9 in FIG. Book) An erect pile 3 and a steel form member (steel plate) 4 having a diameter larger than the outer diameter of the pile so as to surround the head of the pile 3 are arranged substantially coaxially. The steel underground beams 5 are connected to each other, and concrete 6 is filled in a steel form member to form a footing.

FIG. 3 shows an example of a processing state of the steel plate 4 and the steel underground beam 5 having the joint used in the above. In the factory, a steel plate 4 having a joint is welded to both ends of a steel underground beam 5, and a stud dowel 7 is welded to the steel plate 4 having a joint on a surface opposite to a steel underground beam welding surface. Transport to the site.

FIG. 4 shows an example of the lower structure 1. In order to surround the pile 3 erected underground, a plurality of members obtained by processing a steel underground beam 5 on a steel plate 4 having a joint shown in FIG. Build a footing and underground beam by filling it with concrete 6. As the steel underground beam 5, a section steel or a steel pipe is used.

FIG. 5 shows an example of a processing state of a steel form member using a steel sheet pile. This is a method in which a ready-made straight steel sheet pile 9 is machined into a U-shape as shown in (a-1), an underground beam is joined to the center of each, and assembled on site as shown in (a-2). Since this can be applied only to small diameter piles, when the pile has a large diameter, as shown in (b-1), a member obtained by processing a straight steel sheet pile 9 into a V-shape and a member obtained by processing an underground beam into a ready-made state Are combined as shown in (b-2). Further, the steel sheet having the joint may be a corner steel sheet pile, a U-shaped steel sheet pile, or a wide steel sheet pile.

FIG. 6 shows an example of a processing state of a steel frame member using the steel pipe 10. The steel pipe is cut at a plurality of locations in the axial direction, and the members that have been processed into underground beams and joints are combined on site. The diameter of the footing can be adjusted by the diameter of the steel pipe. In addition, the stud dowel 7 is welded in the steel formwork to improve the adhesive force between the concrete and the steel formwork member.

[0011]

According to the above joint structure of the present invention, on-site formwork, reinforcing concrete work, or on-site work such as welding work can be labor-saving and simplified, and work can be performed in a short work period. Becomes

[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 plan view of a steel form member.

FIG. 4 is a plan view showing an example of the lower structure of FIG. 1;

FIG. 5 is a diagram showing a processing state of a steel form member using a steel sheet pile.

FIG. 6 is a processing state diagram of a steel mold member using a steel pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower structure 2 Upper structure 3 Pile 4 Steel plate with joint 5 Underground beam 6 Concrete 7 Stud dowel 8 Steel formwork 9 Straight steel sheet pile 10 Steel pipe

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yuzo Akashi 20-1 Shintomi, Futtsu-shi, Chiba F-term in the Technology Development Division of Nippon Steel Corporation (reference) 2D046 BA00 BA12 BA31 CA01

Claims (4)

[Claims] 1. A steel pipe pile having a head protruding from the ground or an excavation surface, and a steel form member having a diameter larger than the outer diameter of the steel pipe pile is disposed substantially coaxially via a joint so as to surround the protrusion. And, a structure in which concrete is filled in the inside of the steel form member to build a footing, wherein the steel form member is formed by welding steel plates having joints at both ends of a steel underground beam. A joint structure between a foundation and an underground beam, comprising a member. 2. A steel form member having a shape obtained by welding a steel plate having a joint to both ends of a steel underground beam at a factory in advance at a factory, and combining the steel plate with the joint with the steel plate at a site to construct a steel form. 2. The joint structure between a foundation and an underground beam according to claim 1, wherein the footing is constructed by filling the inside with concrete. 3. The joint structure between a foundation and an underground beam according to claim 1, wherein the steel plate having the joint is one of a ready-made steel sheet pile, a steel sheet pile, a steel pipe, and a steel sheet processed. . 4. A stud dowel is welded to a concrete filling surface side of a steel plate having a joint to improve the adhesive force between the concrete and the steel form member.
The joint structure between a foundation and an underground beam according to any one of the above items.