JP2008069612A - Steel pipe pile cap and joint structure of steel pipe pile and footing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe pile cap, simple in structure and inexpensive, and joint structure of a steel pipe pile and a footing, joining a steel pipe pile and a footing without welding the steel pipe pile cap and a steel pipe pile head at construction site. <P>SOLUTION: This steel pipe pile cap 2 includes: a vertical reinforcement member 21; a horizontal reinforcement member 22 and a frame member 23, wherein both reinforcement members 21, 22 are disposed to substantially intersect perpendicularly to each other. Both reinforcement members 21, 22 include flat parts 211, 221 and bent parts 212, 222, wherein the frame member 23 is disposed on the bent parts 212, 222. A bearing member 3 is fitted to each end part of the bent parts 212, 222. A portion where both reinforcement members 21, 22 and the frame member intersect is fixed by binding 4. The steel pipe pile cap 2 is placed at the end of the steel pipe pile and buried in the footing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a steel pipe pile cap used for joining a steel pipe pile and a footing (concrete foundation) and a joining structure of a steel pipe pile and a footing using the steel pipe pile cap.

  To prevent the lower part of the footing from cracking or breaking due to the reaction force of the steel pipe pile when a vertical load is transmitted from the superstructure to the footing in the joint structure of the steel pipe pile and the footing, A method has been proposed in which a load transmitting member is attached to increase the pressure receiving area and the bearing pressure (supporting pressure) is reduced. A ring-shaped flange having a predetermined width has been proposed as a load transmission member (see Patent Document 1).

A steel pipe pile and footing joint structure using a ring-shaped flange as a conventional load transmission member will be described with reference to FIG.
Fig.6 (a) is a side view of the joining structure of a steel pipe pile and a footing, FIG.6 (b) is a top view of the steel pipe pile head part in Fig.6 (a).
The steel pipe pile 11 is driven into the ground 16, and its head is embedded in the footing 15. A flange 12 is attached to the head of the steel pipe pile 11 with a rib 13. The rib 13 is welded to both the flange 12 and the steel pipe pile 11. The flange 12 may be welded directly to the steel pipe pile 11 without using the rib 13. A lid 14 is attached to the tip of the steel pipe pile 11.

Japanese Patent Laid-Open No. 2003-74071

In the case of the joint structure of the steel pipe pile and the footing shown in FIG. 6, the ring-shaped flange 12 must be manufactured according to the thickness of the steel pipe pile, and the flange must be welded to the steel pipe pile 11 at the footing construction site. When welding at the footing construction site, welding materials, etc. must be brought into the construction site, are easily affected by the weather such as rain, and the concrete can not be placed in the footing during the welding. The work efficiency may be poor and the quality of welding may not be sufficient.
The present invention provides a steel pipe pile cap that has a simple structure and is easy to manufacture and is inexpensive in view of the above-described problems of the conventional steel pipe pile and footing joint structure. By using the steel pipe pile cap, welding is performed at the construction site. It is an object of the present invention to provide a steel pipe pile and footing joint structure with good workability.

In order to achieve the object of the present invention, the steel pipe pile cap according to claim 1 includes a vertical reinforcing member, a horizontal reinforcing member, and a frame member, and both the reinforcing members are bent in the same direction at the flat portion and both ends. The frame members are arranged so as to be substantially orthogonal to each other, and the frame members are arranged so as to be substantially orthogonal to the bent portions of both the reinforcing members, and a supporting member is provided at the ends of the bent portions of both the reinforcing members. At least a portion of the frame members and the bent portions of the two reinforcing members that are substantially orthogonal to each other is fixed. It is characterized by being.
A steel pipe pile cap according to a second aspect is the steel pipe pile cap according to the first aspect, wherein the fixing is a bundling.
The steel pipe pile cap according to claim 3 is the steel pipe pile cap according to claim 1, wherein the fixing is welding.
According to a fourth aspect of the present invention, there is provided a steel pipe pile and footing joint structure in which the steel pipe pile cap according to claim 1 is placed on the head of the steel pipe pile so that the bent portions of both reinforcing members face downward. The head and the steel pipe pile cap are embedded in the footing.
According to a fifth aspect of the present invention, there is provided a steel pipe pile and footing joint structure in which the steel pipe pile cap according to claim 2 or 3 is placed on the head of the steel pipe pile so that the bent portions of both reinforcing members face downward. The head of the steel pipe pile and the steel pipe pile cap are embedded in the footing.

  The steel pipe pile cap of the present invention can be manufactured simply by assembling the bent vertical reinforcing member, the horizontal reinforcing member and the frame member so as to intersect each other, so that the structure is simple and easily manufactured at low cost without troublesome machining. it can. The steel pipe pile cap is assembled in advance at the factory or construction site, and at the time of construction, the steel pipe pile cap is placed on the steel pipe pile head without being welded to the steel pipe pile cap and embedded in the footing. Only steel pipe pile and footing can be joined. Therefore, the joining work of the steel pipe pile and the footing is simple, efficient and good workability. Moreover, since a steel pipe pile cap can be commonly used for steel pipe piles having different outer diameters, it has versatility.

  Since the steel pipe pile cap of the present invention is assembled in a bowl shape by combining the vertical reinforcing member, the horizontal reinforcing member, and the frame member, the strength of the footing is increased. In addition, when a vertical load is transmitted to the footing from the superstructure, the vertical load is transmitted to the steel pipe pile through the steel pipe pile cap, so that the footing is cracked by the reaction force of the steel pipe pile. , Prevent destruction. By increasing the size (area) of the bearing member, it is possible to increase the effect of preventing cracking and destruction of the footing due to the reaction force of the steel pipe pile.

  The steel pipe pile and footing joint structure of the present invention can be constructed simply by placing a steel pipe pile cap on the head of the steel pipe pile, placing concrete and burying them in the footing. The work becomes simple and efficient, and further, it is not necessary to weld the steel pipe pile head and the steel pipe pile cap at the construction site, so that the time required for joining can be shortened. In addition, the steel pipe pile and footing joint structure of the present invention has a steel pipe pile cap that is three-dimensionally embedded in the footing, so that the strength of the footing is increased and the effect of preventing cracking and breakage of the footing due to the reaction force of the steel pipe pile. Becomes larger.

An embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is used for the part common to each figure.
1-4 shows the structure of a steel pipe pile cap, and FIG. 5 shows the joining structure of a steel pipe pile and a footing.

FIG. 1 is a view showing a basic structure of a steel pipe pile cap, FIG. 1 (a) is a plan view, FIG. 1 (b) is a side view, and FIG. 1 (c) is an enlarged perspective view of a bearing member. It is.
The steel pipe pile cap 2 includes a vertical reinforcing member 21, a horizontal reinforcing member 22, and a frame member 23. The longitudinal reinforcing member 21 includes a flat portion 211 and a bent portion 212 having both ends bent in the same direction, and the lateral reinforcing member 22 includes a flat portion 221 and a bent portion 222 having both ends bent in the same direction. The vertical and horizontal names are relative, and one of the members 21 and 22 is called a vertical reinforcing member, and the other is called a horizontal reinforcing member. At both ends of the bent portion 212 of the vertical reinforcing member 21 and the bent portion 222 of the lateral reinforcing member 22, the supporting member (wing member) 3 having the same structure is attached.
The longitudinal reinforcing member 21 and the lateral reinforcing member 22 are arranged so that the bent portions 212 and 222 are oriented in the same direction and substantially orthogonal, and the ring-shaped frame member 23 is substantially orthogonal to the bent portions 212 and 222. It is arranged to do. Therefore, the steel pipe pile cap 2 is assembled in a conical bowl shape by the vertical reinforcing member 21, the horizontal reinforcing member 22 and the frame member 23.

Locations where the longitudinal reinforcing member 21 and the lateral reinforcing member 22 intersect and locations where the longitudinal reinforcing member 21 and the lateral reinforcing member 22 intersect with the frame member 23 are bound and fixed by metal wires. A cross with a symbol 4 represents binding. For fixing the intersection, a fixing bracket such as a clasp (hook) may be used in addition to binding, or welding may be performed. Since the steel pipe pile cap 2 should just maintain the shape of FIG. 1 until it embeds in a footing, even if it is a binding 4, there is no problem. Further, the bundling 4 can be omitted at a location where the vertical reinforcing member 21 and the horizontal reinforcing member 22 intersect.
The bearing member 3 is screwed to the ends of the bent portions 212 and 222 in the same manner as the nut. The shape of the bearing member 3 may be a disc-like bearing member 3a as shown in FIG. 1 (c1), a conical bearing member 3b as shown in FIG. 1 (c2), or a polygonal one. Good. The supporting members 3a and 3b are not formed with threaded portions, but are formed with insertion holes, the ends of the bent portions 212 and 222 are inserted into the insertion holes, and another nut is screwed into the end. Then, the supporting members 3a and 3b may be held. Further, the support member 3 may be a cylindrical (ring-shaped) support member 3c as shown in FIG. 1 (c3). The support member 3c is formed with an insertion hole in the side surface, and the end portions of the bent portions 212 and 222 are inserted into the insertion hole and welded, or a nut is screwed into the end portions of the bent portions 212 and 222 and held. To do. Since the support member 3c is a member common to the bent portions 212 and 222, the steel pipe pile cap 2 becomes stronger, and the effect of preventing cracking and destruction of the footing is increased when embedded in the footing.

The longitudinal reinforcing member 21, the lateral reinforcing member 22, and the frame member 23 are made of reinforcing steel, FB, or the like, and the bearing member 3 is made of steel or the like.
Since the steel pipe pile cap 2 only needs to be assembled by intersecting the bent vertical reinforcing member 21, lateral reinforcing member 22, and frame member 23, the structure is simple and can be produced without troublesome machining. Therefore, the steel pipe pile cap 2 can be easily manufactured at low cost. The steel pipe pile cap 2 is assembled in advance at the factory or construction site, and can be joined to the steel pipe pile and the footing by simply placing it on the steel pipe pile head and embedding it in the footing as described later. No welding is required. Therefore, the joining work of the steel pipe pile and the footing becomes simple and efficient. Moreover, if the steel pipe pile cap 2 is a steel pipe pile having an outer diameter smaller than the lengths of the flat portions 211 and 221 of the vertical reinforcing member 21 and the horizontal reinforcing member 22, it can be commonly used for steel pipe piles having different outer diameters. , Versatile.

Since the steel pipe pile cap 2 is assembled in a bowl shape by combining the vertical reinforcing member 21, the horizontal reinforcing member 22 and the frame member 23, the strength of the footing is increased. Moreover, when a vertical load is transmitted from the superstructure to the footing, the vertical load is transmitted to the steel pipe pile cap 2 by the flat portions 211 and 221 of the vertical reinforcing member 21 and the horizontal reinforcing member 22 as described later. Is done. At this time, the vertical load transmitted to the footing is also transmitted to the bearing member 3, but the vertical load transmitted to the bearing member 3 is transmitted to the flat portions 211 and 221 via the bent portions 212 and 222. The The supporting member 3 has a larger transmission effect as the area increases.
The steel pipe pile cap 2 transmits the vertical load transmitted from the superstructure to the footing as described above to the steel pipe pile. That is, when a vertical load is transmitted from the upper structure to the footing, the reaction force of the steel pipe pile is applied to the flat portions 211 and 221 of the steel pipe pile cap 2, and the bent portions 212 and 222 are pulled toward the flat portions 211 and 221. Although the force works, the frictional force of the bent portions 212 and 222 is large, so that the footing is not cracked or broken by the reaction force of the steel pipe pile.

FIG. 2 shows a steel pipe pile cap in which a plurality of vertical and horizontal reinforcing members are arranged and a ring-shaped frame member is used.
2A is a plan view, and FIG. 2B is a side view.
The vertical reinforcing member 21 and the horizontal reinforcing member 22 each have three members arranged in parallel, and the frame member 23 is a ring-shaped member. Supporting pressure members 3 are attached to both ends of the six reinforcing members. The flat portion 211 of the vertical reinforcing member 21 and the flat portion 221 of the lateral reinforcing member 22 are each the longest at the center member, and the members on both sides are shorter than the central member, and the flat portions 211 of the six reinforcing members. , 221 (boundaries with the bent portions 212, 222) are formed in a substantially circular shape. Therefore, the bent portion 212 of the vertical reinforcing member 21 and the bent portion 222 of the lateral reinforcing member 22 are arranged in a substantially conical shape.

Since the steel pipe pile cap 2 only needs to maintain the shape of FIG. 2 until it is embedded in the footing, the binding 4 at the location where the vertical reinforcing member 21 and the horizontal reinforcing member 22 intersect can be omitted. When the portions are bound, only the portion that intersects the central member of the vertical reinforcing member 21 and the horizontal reinforcing member 22 may be used.
Since the steel pipe pile cap 2 in FIG. 2 has a large number of vertical reinforcing members 21 and horizontal reinforcing members 22, the strength of the footing is further increased, and the vertical load transmitted from the upper structure to the footing is more than that from the steel pipe pile. It is transmitted reliably, and the effect of preventing cracking and destruction of the footing is further increased.

FIG. 3 shows a steel pipe pile cap in which a plurality of vertical and horizontal reinforcing members are arranged and a rectangular frame member is used.
FIG. 3A is a plan view, and FIG. 3B is a side view.
The vertical reinforcing member 21 and the horizontal reinforcing member 22 each have three members arranged in parallel, and the frame member 23 is a rectangular member. The flat portion 211 of the vertical reinforcing member 21 and the flat portion 221 of the horizontal reinforcing member 22 are all the same length, and the edges of the flat portions 211 and 221 of the six reinforcing members (boundaries with the bent portions 212 and 222). Is formed in a substantially rectangular shape. Therefore, the bent portion 212 of the vertical reinforcing member 21 and the bent portion 222 of the lateral reinforcing member 22 are arranged in a quadrangular pyramid shape. That is, the steel pipe pile cap 2 has a quadrangular pyramid shape.
The steel pipe pile cap of FIG. 3 can be used for both square steel pipe piles and circular steel pipe piles.

FIG. 4 shows a steel pipe pile cap in which one vertical and horizontal reinforcing members are arranged and a plurality of ring-shaped frame members are used.
4A is a plan view, and FIG. 4B is a side view.
The steel pipe pile cap 2 uses three ring-shaped frame members 23 in which one vertical reinforcing member 21 and a horizontal reinforcing member 22 are orthogonal to each other as in FIG.
The steel pipe pile cap 2 in FIG. 4 has a high footing strength because the number of frame members 23 intersecting the bent portions 212 and 222 of the vertical reinforcing member 21 and the horizontal reinforcing member 22 is large. In addition, the effect of preventing cracking and breakage of the footing due to the reaction force of the steel pipe pile is increased.
In FIG. 4, a plurality of vertical reinforcing members 21 and horizontal reinforcing members 22 may be arranged as in FIGS. 2 and 3. In this case, the strength of the footing is further increased, and the effect of preventing cracking and destruction of the footing due to the reaction force of the steel pipe pile is further increased.

FIG. 5 shows a joining structure of a steel pipe pile and a footing.
FIG. 5A is a plan view and FIG. 5B is a side view. FIG. 5 shows only a part of the footing, the ground, and the steel pipe in cross section.
The steel pipe pile 51 is driven into the ground 62, and the head is filled with concrete 52. The steel pipe pile cap 2 is formed so that the flat portions 211 and 221 of the vertical reinforcing member 21 and the horizontal reinforcing member 22 are in contact with the head end portion of the steel pipe pile 51 and the ends of the bent portions 212 and 222 are directed downward (flat It is placed on the head of the steel pipe pile 51 and embedded in the footing 61 so as to be lower than the portions 211 and 221. That is, the footing 61 is constructed by placing concrete with the steel pipe pile cap 2 placed on the head of the steel pipe pile 51, and the steel pipe pile 51 and the footing 61 are joined.

  When a vertical load is transmitted from the superstructure (not shown) to the footing 61, the vertical load is transmitted to the steel pipe pile cap 2 and transmitted from the steel pipe pile cap 2 to the steel pipe pile 51. That is, the vertical load transmitted to the footing 61 is transmitted to the flat portions 211 and 221 of the longitudinal reinforcing member 21 and the lateral reinforcing member 22 and transmitted to the steel pipe pile 51. At that time, the vertical load transmitted to the footing 61 is also transmitted to the bearing member 3, and the vertical load transmitted to the bearing member 3 is transmitted through the bent portions 212 and 222 of the longitudinal reinforcing member 21 and the lateral reinforcing member 22. Are transmitted to the flat portions 211 and 221. Therefore, the steel pipe pile cap 2 can prevent the footing 61 from being cracked or broken by the reaction force of the steel pipe pile 51 even if a vertical load is transmitted from the superstructure to the footing 61.

  Since the steel pipe pile cap 2 is formed in a conical bowl shape by the orthogonal vertical reinforcing member 21, the horizontal reinforcing member 22, and the frame member 23 orthogonal to the bent portions 212, 222 of both reinforcing members, It is buried three-dimensionally. Therefore, in the steel pipe pile cap 2, the vertical reinforcing member 21, the flat portions 211, 221 and the bent portions 212, 222 of the horizontal reinforcing member 22 combine to increase the strength of the footing 61, and the frame member 23 increases the strength. is doing.

The steel pipe pile cap 2 shown in FIG. 5 is composed of one (one) vertical reinforcing member 21, lateral reinforcing member 22, and frame member 23. The number of the steel pipe pile caps 2 is as shown in FIG. 2, FIG. 3, and FIG. If the number is increased, the effect of preventing cracking and breakage of the footing 61 due to the reaction force of the steel pipe pile 51 is further increased, and the strength of the footing 61 is further increased.
In the case of FIG. 5, the bent portions 212 and 222 of the vertical reinforcing member 21 and the horizontal reinforcing member 22 are inclined and arranged in a conical shape, but are bent at right angles to the flat portions 211 and 221 and arranged in a cylindrical shape. Then, since it becomes parallel to the axis of the steel pipe pile 51, the vertical load transmitted to the bearing member 3 is more efficiently transmitted to the flat portions 211 and 221.

The basic structure of the steel pipe pile cap which concerns on Example 1 of this invention is shown. A steel pipe pile cap using a ring-shaped frame member in which a plurality of vertical and horizontal reinforcing members according to Embodiment 1 of the present invention are arranged. A steel pipe pile cap using a square frame member in which a plurality of vertical and horizontal reinforcing members according to Embodiment 1 of the present invention are arranged. 1 shows a steel pipe pile cap in which one vertical / horizontal reinforcing member according to Embodiment 1 of the present invention is arranged and a plurality of ring-shaped frame members are used. The joining structure of the steel pipe pile and footing which concerns on Example 2 of this invention is shown. The conventional steel pipe pile and footing joint structure is shown.

Explanation of symbols

21, 22 Longitudinal reinforcing member, Horizontal reinforcing member 211, 221 Flat portion 212, 222 Bending portion 23 Frame member 3, 3a, 3b, 3c Bearing member 4 Bundling 51 Steel pipe pile 52 Concrete 61 Footing 62 Ground

Claims (5)

  It consists of a longitudinal reinforcement member, a lateral reinforcement member, and a frame member, and both reinforcement members are arranged so that a flat part and both ends are bent substantially in the same direction, and are arranged so as to be substantially orthogonal. The support members are attached to the ends of the bent portions of the two reinforcing members, and the portions of the two reinforcing members that are substantially orthogonal to each other and the frame members and the two reinforcing members are arranged. A steel pipe pile cap in which at least the substantially orthogonal portions of the bent portions of the frame member and the two reinforcing members are fixed among the substantially orthogonal portions of the bent portion.   The steel pipe pile cap of Claim 1 WHEREIN: The said fixation is a binding, The steel pipe pile cap characterized by the above-mentioned.   The steel pipe pile cap according to claim 1, wherein the fixing is welding.   The steel pipe pile cap according to claim 1 is placed on the head of the steel pipe pile so that the bent portions of both reinforcing members face downward, and the head of the steel pipe pile and the steel pipe pile cap are embedded in the footing. Characteristic steel pipe pile and footing joint structure.   The steel pipe pile cap according to claim 2 or 3 is placed on the head of the steel pipe pile so that the bent portions of both reinforcing members face downward, and the head of the steel pipe pile and the steel pipe pile cap are embedded in the footing. A steel pipe pile and footing joint structure characterized by

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