JP6871493B2 - Pile head reinforcement structure - Google Patents

Description

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to sufficiently secure a stress transmission action and a fixing force, reduce the possibility of interference with the reinforcement arrangement buried in the foundation, and reduce the welding manpower as a pile head reinforcement structure. This relates to a pile head reinforcement structure that can improve the construction quality around the pile head and can appropriately secure the structural strength.

In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is buried in the foundation, and the lower side is provided with the pile head so that stress can be transmitted. Patent Document 1 is known as a reinforcing structure.

The "method of connecting a ready-made pile and a foundation slab" of Patent Document 1 has an object of providing a method of firmly connecting a ready-made pile and a foundation slab with a small amount of reinforcing bars, and has a diameter larger than the outer diameter of the ready-made pile. Then, after mounting a metal short pipe with a guide on the inside and welded reinforcing bars on the outside to the pile head of the ready-made pile, concrete for forming a foundation slab in the gap between the metal short pipe and the ready-made pile is installed. The pile head is filled and reinforced, and the ready-made pile and the formed foundation slab are integrated.

Japanese Unexamined Patent Publication No. 10-266227

In Patent Document 1, a reinforcing bar having a circular cross section is generally welded to a short pipe. When a reinforcing bar is used to transmit the bending moment and axial force acting on the pile head between the foundation and the pile, in order to secure a sufficient stress transmission action and to securely fix the reinforcing bar, the reinforcing bar must be used. The length needs to be 30 to 40 times the diameter of the reinforcing bar, and interference between the reinforcing bar and the reinforcing bar embedded in the foundation occurs.

Further, as the reinforcing bar, a deformed reinforcing bar having irregularities or the like is used in order to secure good fixing, and since joining is performed by flare welding, the welding technique is extremely difficult and welding defects are likely to occur.

Such a problem was not limited to the case of joining the reinforcing bar to the short pipe, but was the same even when the reinforcing bar was directly joined to the pile head.

Furthermore, the force and stress transmission performance of the pile head reinforcement structure is greatly affected by the quality of welding when constructing the structure, so it is desirable to reduce the number of welded joints in the pile head reinforcement structure as much as possible. It has also been requested to improve the workability of the pile head reinforcing structure by reducing the number of welding steps in this way.

The present invention was devised in view of the above-mentioned conventional problems, and it is possible to sufficiently secure the stress transmitting action and the fixing force, and there is a possibility that interference with the reinforcing bars buried in the foundation may occur. As a pile head reinforcement structure that can be reduced, it is possible to improve the construction quality around the pile head by reducing the welding manpower, and to provide a pile head reinforcement structure that can appropriately secure the structural strength. The purpose.

The pile head reinforcement structure according to the present invention is a structure for reinforcing the pile head that protrudes upward from the ground and is buried in the foundation concrete, and the pile head is lateral to the outer peripheral surface of the pile head. A plurality of plates that are projected outward in the radial direction of the portion in a vertical vertical posture, are not directly joined to the pile head, and are provided at appropriate intervals in the circumferential direction of the pile head. It has a shaped material, a first joint portion to be joined to the pile head, and a second joint portion to be joined to the plate-shaped material in order to join the plate-shaped material to the pile head. A stress transmission member that transmits stress between the pile head and the plate-shaped material, a through hole formed through each of the plate-shaped materials in the plate thickness direction, and each of the plate-shaped materials. A projecting portion is provided from the plate surface around the through hole so as to project in the circumferential direction of the pile head, and the plate-shaped material is provided by being joined to the pile head via the stress transmission member. It is, and the plate-like member and the stress transmission member, characterized in that it is embedded in the foundation concrete is Da設around the pile head.

The stress transmitting member is characterized by including a lower member joined to the lower portion of the plate-shaped member in a vertical direction and an upper member joined to the upper portion of the plate-shaped member.

The stress transmitting member is characterized in that it is arranged so as not to overlap the protruding portion in the vertical direction.

The stress transmission member is characterized in that an extension portion is formed so as to project outward in the radial direction of the pile head.

The expansion portion is characterized in that it is arranged in the circumferential direction of the pile head so as not to protrude from the protrusion.

The stress transmitting member is characterized in that it is formed in an annular shape surrounding the outer peripheral surface of the pile head.

In the pile head reinforcing structure according to the present invention, the stress transmission action and the fixing force can be sufficiently secured, the possibility of interference with the reinforcing bars buried in the foundation can be reduced, and the pile head reinforcing structure can be reduced. As a result, the construction quality around the pile head can be improved by reducing the welding manpower, and the structural strength can be appropriately secured. Specifically, the plate-shaped material itself is not directly joined to the pile head, and the joining work of the plate-shaped material to the pile head can be unnecessary. Stress can be transmitted to the pile head via a stress transmission member without welding the plate-shaped material to the pile head, and when the plate-shaped material is weld-joined, the stress is locally concentrated on the pile head. It is possible to prevent the pile head from being deformed and to efficiently transfer the stress from the plate-like material to the pile head while ensuring stress relief for the pile head with the stress transmission member.

It is explanatory drawing explaining 1st Embodiment of the pile head reinforcement structure which concerns on this invention. It is explanatory drawing explaining the component component which comprises the pile head reinforcement structure shown in FIG. It is a schematic side view which shows the modification of the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the 2nd Embodiment of the pile head reinforcement structure which concerns on this invention.

Hereinafter, a preferred embodiment of the pile head reinforcing structure according to the present invention will be described in detail with reference to the accompanying drawings. 1A and 1B are explanatory views illustrating a first embodiment of a pile head reinforcing structure according to the present invention, FIG. 1A is a plan view, FIG. 1B is a side view, and FIG. 2 is FIG. 2 (A) is a view showing a plan view and a side view of a plate-like material, and FIG. 2 (B) is a stress transmission diagram for explaining the components constituting the pile head reinforcing structure shown in FIG. A view showing a side view and a plan view of the member, FIG. 2C is a side view showing a state in which the stress transmission member is welded and joined to the plate-shaped material.

As is well known, the pile 1 is driven into the ground G so that the pile head 2 protrudes upward from the ground G. In the present embodiment, the pile 1 is a hollow cylindrical pile having a steel pipe portion at least at the pile head 2, and for example, a steel pipe pile (S pile), a concrete pile with an outer shell steel pipe (SC pile), or the like. Used.

In these piles 1, when the foundation concrete C is placed, the hollow inside of the pile 1 is filled with the foundation concrete C, or when the foundation concrete C is not filled, the opening of the pile head 2 is closed. , A top plate is provided on the upper surface. The pile head 2 is buried in the foundation concrete C for constructing the foundation together with the foundation reinforcement (not shown) arranged around the pile head 2 including the footing form.

The pile head 2 is a joint portion between the foundation and the pile 1 itself on the ground G side, and bending moment, shearing force, and axial force act due to various external forces, so that the pile head 2 is reinforced. A pile head reinforcement structure 3 is provided.

In the pile head reinforcing structure 3 according to the first embodiment, the plate-shaped material 4 for reinforcing the pile head 2 by engaging with the foundation concrete C and the plate-shaped material 4 are attached to the pile head 2 with high strength. It is provided with a stress transmission member 5 for joining so as to be able to transmit stress.

The plate-shaped members 4 are arranged at appropriate intervals in the circumferential direction of the pile head 2, preferably at equal intervals. In the illustrated example, four plate-shaped members 4 are arranged around the pile head 2 at 90 ° intervals. The plate-shaped material 4 is formed of a steel flat plate material.

The plate-shaped member 4 is projected vertically outward in the vertical direction along the height direction of the pile head 2, and the plate surface 4a is directed in the horizontal and horizontal directions. In the illustrated example, the plate-shaped material 4 is formed in a quadrangular shape. However, the form of the plate-shaped material 4 does not matter as long as the upper edge 4b and the lower edge 4c are both linear and parallel to each other.

The plate-shaped member 4 is positioned on the outer peripheral surface 2a side of the pile head 2. That is, the height position of the upper edge 4b of the plate-shaped material 4 is set lower than the height position of the upper end 2b of the pile head 2, and the entire plate-shaped material 4 is lateral to the outer peripheral surface 2a of the pile head 2. Arranged as in.

In the pile head reinforcing structure 3 according to the present embodiment, each plate-shaped member 4 is further provided with a through hole 6 and a protruding portion 7. In the through hole 6, the foundation concrete C cast around the pile head 2 is circulated between the front and back surfaces of the plate-shaped material 4, and the filling property of the foundation concrete C around the plate-shaped material 4 and the plate-shaped material 4 are formed. In order to enhance the adhesiveness to 4, the plate-like material 4 is formed laterally through the plate thickness direction (horizontal and horizontal directions).

In the illustrated example, one through hole 6 is formed in each plate-shaped member 4, but a plurality of through holes 6 may be formed. When a plurality of pile heads 2 are formed, the through holes 6 are provided in the radial direction of the pile heads 2 from the outer peripheral surface 2a side of the pile heads 2 to the outside of the pile heads 2 in order to suppress the amount of protrusion of the pile heads 2 from the ground G. It is preferable to arrange them toward the side.

Further, although not shown, a foundation reinforcing bar arranged around the pile head 2 or a separately prepared reinforcing reinforcing bar may be inserted into the through hole 6, whereby the pile head 2 may be inserted. It is possible to further improve the bending moment, the bending strength against the shearing force, and the shearing strength.

The protruding portion 7 engages with the foundation concrete C that is driven around the pile head 2 and flows through the through hole 6 and the foundation concrete C that adheres to the plate surface 4a of the plate-like material 4, and has a plate shape of the foundation concrete C. A plate around each through hole 6 in order to further improve the adhesiveness to the material 4 and to more reliably transmit the bending moment, shearing force, and axial force acting on the pile head 2 between the pile 1 and the foundation. It is projected laterally from the plate surface 4a of the shape member 4, that is, toward the circumferential direction of the pile head 2. In the illustrated example, the protruding portion 7 is provided only on one of the front and back surfaces of the plate-shaped material 4, but it is needless to say that the protruding portion 7 may be provided on both the front and back surfaces.

The plate-shaped member 4 having the through hole 6 and the protruding portion 7 is not directly joined to the pile head 2 by itself, and therefore, even if the plate-like material 4 is provided so as to be in contact with the outer peripheral surface 2a of the pile head 2, the outer peripheral surface is provided. It may be provided apart from 2a, and the plate-shaped member 4 is provided by being joined to the pile head 2 via the stress transmission member 5. In other words, the joining work of the plate-shaped material 4 with respect to the pile head 2 is not required. In terms of workability, the plate-shaped material 4 may be temporarily welded to the pile head 2 to ensure the convenience of joining work of the stress transmission member 5, which will be described later.

The stress transmission member 5 is provided on each of the plate-shaped members 4 in pairs of two on the top and bottom. The stress transmitting members 5 are also provided at appropriate intervals in the circumferential direction of the pile head 2, preferably at equal intervals, in accordance with the arrangement of the plate-shaped members 4. In the illustrated example, four locations are provided around the pile head 2 in accordance with the positions of the four plate-shaped members 4. A plurality of plate-shaped members 4 may be provided on one stress transmission member 5.

The stress transmitting member 5 is joined to the lower portion, that is, the lower edge 4c of each of the vertically oriented plate-shaped members 4, as the lower member 8, and is joined to the upper portion, that is, the upper edge 4b. The upper member 9 is formed of a pair of upper and lower members. The upper member 9 is of course provided at a height position lower than the height position of the upper end 2b of the pile head 2 for joining with the pile head 2.

Both the upper member 9 and the lower member 8 of the stress transmission member 5 are laid sideways so that the plate surface 5a faces up and down along the height direction of the pile head 2, and the pile head is laid down. It is provided so as to project outward in the radial direction of 2. The stress transmission member 5 is formed of a steel flat plate having a length direction long along the circumferential direction of the pile head 2 and a width direction short along the radial direction of the pile head 2.

The stress transmission member 5 is formed in an arc shape along the outer peripheral surface 2a so that both side edges in the width direction, that is, the inner edge 5b facing the outer peripheral surface 2a of the pile head 2 is in contact with the outer peripheral surface 2a. At the same time, the outer edge 5c is formed in an arc along the inner edge 5b, while the form of the pair of lengthwise edges connecting the outer edge 5c and the inner edge 5b does not matter. The width dimension of the stress transmitting member 5 along the radial direction of the pile head 2 is formed narrower than the protruding dimension of the plate-shaped member 4 protruding in the radial direction of the pile head 2.

In the stress transmission member 5, the upper plate surface 5a of the lower member 8 is a second joint portion to be welded to the lower edge 4c of the plate-like material 4, and the upper member 9 is the lower side of the lower member 9. The plate surface 5a is a second joint portion to be welded to the upper edge 4b of the plate-like material 4. Therefore, these plate-shaped members 4 and the stress transmitting member 5 are combined so as to exhibit a "work" shape when viewed from the radial direction of the pile head 2. It is preferable that the installation position of the plate-shaped member 4 to be joined to the plate surface 5a of the stress transmission member 5 forming the second joint portion is set at the center in the length direction of the stress transmission member 5.

Further, both the upper member 9 and the lower member 8 of the stress transmission member 5 are designated as the first joint portion in which the inner edge 5b thereof is welded to the pile head 2. Welding and joining of the plate-shaped material 4 and the stress transmitting member 5 is performed in advance at a factory or on-site with good workability before welding and joining to the pile head 2. The stress transmission member 5 and the plate-shaped member 4 which are joined to each other via the plate surface 5a which is the second joint portion and assembled are welded to the pile head 2 as a unit.

The inner edge 5b, which is the first joint portion of the stress transmission member 5, is joined to the pile head 2 by horizontal fillet welding at the site. At this time, the inner edge 5b is formed in an arc shape along the outer peripheral surface 2a of the pile head 2, and is along the length direction of the stress transmission member 5, so that the pile head is welded and joined over a long distance. The stress transmission member 5 is joined to the pile head 2 with high strength so as to prevent the out-of-plane deformation of 2.

On the other hand, in order to extend the width direction dimension of the plate surface 5a of the second joint portion to be joined to the plate-shaped member 4 in the narrow stress transmission member 5, the pile head 2 is moved outward in the radial direction. The expansion portion 10 is formed by projecting. The expansion portion 10 is formed so as to slightly project from the plate-shaped material 4 to both sides in the plate thickness direction.

Explaining the mutual relationship between the stress transmitting member 5 having the expansion portion 10 and being joined to the plate-shaped member 4 and the protruding portion 7 formed on the plate-shaped member 4, the stress transmitting member 5 is the protruding portion 7. In detail, when a plurality of protrusions 7 are formed, they are arranged so as not to overlap the protrusions 7 closest to the pile head 2 in the vertical direction.

Specifically, the extension portion 10 with respect to the protrusion 7 so that the tip 10a of the expansion portion 10 projecting outward in the radial direction of the pile head 2 does not reach the protrusion 7 (indicated by the dimension X in the drawing). The formation range of is set. Even when the expansion portion 10 is not formed, the width dimension of the stress transmission member 5 is set so that the outer edge 5c of the stress transmission member 5 does not reach the protrusion 7.

Further, when the expansion portion 10 is formed, the stress transmission member 5 has a protrusion portion 7a protruding from the plate surface 4a of the plate-shaped member 4 toward the circumferential direction of the pile head 2. The formation range of the expansion portion 10 with respect to the protrusion 7 is set so that the extension direction edge 10b of the expansion portion 10 slightly protruding from the plate-shaped material 4 does not protrude (indicated by the dimension Y in the drawing).

By setting the formation range of the stress transmission member 5 including the expansion portion 10, it is possible to prevent the flow action and adhesion of the foundation concrete C around the protrusion 7 from being hindered, and the pile 1 and the foundation by the protrusion 7 The transmission of the bending moment or the like acting on the pile head 2 between the pile heads 2 is surely performed without being hindered, and appropriate reinforcement of the pile head 2 is ensured.

Explaining the operation of the pile head reinforcing structure 3 according to the first embodiment, in the construction thereof, first, at a factory or a site, either the upper edge 4b or the lower edge 4c of the plate-shaped material 4 shown in FIG. 2 is explained. After joining either the upper member 9 or the lower member 8 of the stress transmission member 5 by downward horizontal fillet welding via the plate surface 5a which is the second joint portion, the plate-like material 4 is used. The other of the lower member 8 or the upper member 9 of the stress transmission member 5 is similarly joined to either the lower edge 4c or the upper edge 4b via the plate surface 5a by downward horizontal fillet welding.

As a result, a plurality of plate-shaped members 4 and stress transmitting members 5 are assembled as integrated parts for joining to the outer peripheral surface 2a of the pile head 2. Since the welding joint is a downward work, it can be easily performed with good workability and high welding quality.

Next, each stress transmission member incorporated in each of the plurality of parts on the outer peripheral surface 2a of the pile head 2 protruding upward from the ground G at intervals along the circumferential direction of the pile head 2. The inner edge 5b, which is the first joint portion of 5, is joined to the outer peripheral surface 2a of the pile head 2 by downward horizontal fillet welding, whereby the diameter of the pile head 2 is joined to the pile head 2. A plurality of plate-shaped members 4 having a through hole 6 and a protruding portion 7 are arranged and provided so as to project in the direction.

Since the welding joint of the inner edge 5b, which is the first joint portion, is a downward work, it can be easily performed with good workability and high welding quality.

After that, the foundation concrete C is placed on the ground G, and the pile head 2 is buried in the foundation concrete C together with the foundation reinforcement arranged around the pile head 2, so that the foundation is constructed and at the same time. The construction of the pile head reinforcement structure 3 is completed.

The pile head reinforcing structure 3 according to the first embodiment has a through hole 6 and a fixing portion 7, and is projected outward in the radial direction of the pile head 2 in a vertical posture, and is an outer periphery of the pile head 2. A plurality of plate-shaped members 4 arranged along the circumferential direction of the surface 2a and a stress transmitting member 5 capable of firmly joining and fixing these to the pile head 2 by a simple welding operation sufficiently provide a stress transmitting action and a fixing force. In addition, there is no risk of interference with the foundation reinforcements buried in the foundation, and as a reinforcing structure, there are few components used for it, so the construction around the pile head 2 The quality of the pile head reinforcement structure 3 can be improved, and an excellent pile head reinforcing structure 3 can be obtained.

In particular, since the number of parts constituting the pile head reinforcing structure 3 is small and the weight of the structure 3 can be reduced, even the pile head 2 of the large-diameter pile 1 can be reinforced with excellent workability. ..

When the foundation concrete C is cast, the foundation concrete C circulates on both the front and back surfaces of the plate-shaped material 4 through the through hole 6, and also adheres to the plate-shaped material 4 and also adheres to the protruding portion 7. Therefore, the pile head reinforcing structure 3 including the plate-shaped material 4 can be firmly joined to the foundation.

Further, regarding the fluidity and force transmitting action around the protruding portion 7 and the through hole 6 of the foundation concrete C, the stress transmitting member 5 including the expanding portion 10 is arranged so as not to overlap the protruding portion 7 in the vertical direction. The foundation concrete C wraps around from below and above the plate-like material 4 without obstructing the flow of the foundation concrete C toward the through hole 6 and the protrusion 7, and the foundation concrete C to the periphery of the protrusion 7 and the like. Good filling property can be ensured, and fixing of the plate-shaped material 4 to the foundation can be firmly ensured. Further, the bending moment, the shearing force, and the axial force acting on the pile head 2 can be reliably transmitted between the pile 1 and the foundation by the protruding portion 7 without being affected by the expansion portion 10.

As described above, in the pile head reinforcing structure 3 according to the present embodiment, the stress transmission action and the fixing force can be sufficiently secured, and the possibility of interference with the reinforcing bars buried in the foundation is reduced. At the same time, as the pile head reinforcing structure 3, the construction quality around the pile head 2 can be improved by reducing the welding manpower, and the structural strength can be appropriately secured.

Further, the expansion portion 10 is arranged in the circumferential direction of the pile head 2 so as not to protrude from the protrusion 7, and depending on the configuration, the foundation concrete C flowing around the through hole 6 and the protrusion 7 The filling property of the foundation concrete C around the protrusions 7 and the like can be satisfactorily ensured without obstructing the flow, and the plate-like material 4 can be firmly fixed to the foundation. Further, the protruding portion 7 can surely transmit the bending moment, the shearing force, and the axial force acting on the pile head 2 between the pile 1 and the foundation.

The expansion portion 10 can secure the welding length of the plate surface 5a as the second joint portion, and it is also possible to attach the plate-shaped material 4 provided to the pile head 2 without welding away from the outer peripheral surface 2a. Therefore, the workability can be improved.

The plurality of plate-shaped members 4 embedded and fixed in the foundation in this way are projected outward in the radial direction of the pile head 2 in a vertical vertical posture toward the outer peripheral surface 2a of the pile head 2. Therefore, the pile head 2 is provided at appropriate intervals in the circumferential direction, whereby the bending moment, shearing force, and axial force acting on the pile head 2 can be smoothly applied between the foundation and the pile 1. It can be transmitted and the pile head 2 can be firmly reinforced.

Further, since the plate-shaped material 4 is arranged on the outer peripheral surface 2a side of the pile head 2, there is no protrusion upward of the pile head 2, and the plate-shaped material 4 and the stress transmission member 5 are embedded in the foundation. It is possible to prevent interference with the foundation reinforcement arrangement and improve the workability of the foundation.

When a force in the vertical direction acts on the protruding portion 7 of the plate-shaped material 4, stress due to bending and shearing acts on the pile head 2 around the stress transmitting member 5, but the plate-shaped material 4 is piled up by the stress transmitting member 5. Since it is joined to the head 2, the pile head 2 can be effectively stiffened, and a high-strength pile head reinforcing structure 3 can be obtained.

When the stress transmitting member 5 is joined to the pile head 2, the plate-shaped member 4 is temporarily attached and welded to the outer peripheral surface 2a of the pile head 2, so that the stress transmitting member 5 can be easily joined to the pile head 2. Can be transformed into.

Since the protruding portion 7 is formed so as to surround the through hole 6 from the periphery thereof, both of the protruding portion 7 and the through hole 6 are provided rationally and efficiently as compared with the case where the protruding portion 7 and the through hole 6 are formed separately. Even if the external dimensions of the plate-shaped material 4 are small, a large number of these can be provided, and the foundation concrete C, which flows through the through holes 6 with good filling property, is smoothly fed around the protrusion 7. Therefore, it is possible to ensure a solid adhesion between the two.

Since a plurality of plate-shaped members 4 are arranged around the pile head 2 at intervals, a wide fixing area can be secured by these plurality of plate-shaped members 4, and between the foundation and the pile 1. The stress transfer action can be ensured accurately and sufficiently.

In the present embodiment, the plate-shaped material 4 is not welded to the pile head 2, and the inner edge 5b is formed in an arc shape along the outer peripheral surface 2a of the pile head 2 via the stress transmission member 5. Stress can be transmitted to 2, and when the plate-like material 4 is welded and joined, it is locally concentrated on the pile head 2, for example, the pile head 2 is deformed out of plane due to the tensile action due to the force in the vertical direction. It is possible to prevent the pile head 2 from being deformed by the stress, and while ensuring stress relief for the pile head 2 with the stress transmission member 5, the stress from the plate-like material 4 is efficiently applied to the pile head 2. Can be communicated.

FIG. 3 is a schematic side view showing a modified example of the pile head reinforcing structure shown in FIG. The hatched region R indicates a region in which the plate-shaped member 4 is arranged via the stress transmission member 5. As described above, the arrangement of the plate-shaped members 4 and the like may be a staggered arrangement in which the plate-shaped members 4 and the like are alternately arranged vertically along the circumferential direction of the pile head 2.

With the staggered arrangement, for example, even for a small-diameter pile 1 in which the number of plate-shaped members 4 to be installed is limited due to the small outer peripheral size, the required number of plate-shaped members 4 can be provided by allocating the piles up and down. Even in the case of a large-diameter pile 1, a large number of plate-shaped members 4 can be arranged while avoiding positional interference of adjacent stress transmitting members 5, whereby the required yield strength of the pile head 2 can be obtained. Can be properly secured.

4A and 4B are explanatory views for explaining the second embodiment of the pile head reinforcing structure 3 according to the present invention, FIG. 4A is a plan view, and FIG. 4B is a side view. The second embodiment differs from the first embodiment in that, first, the upper member 9 of the stress transmission member 5 is omitted. With such a configuration, the number of welded joints can be reduced and the construction efficiency can be improved.

The second difference is that the stress transmission member 5 is formed in an annular shape surrounding the outer peripheral surface 2a of the pile head 2. Therefore, a plurality of plate-shaped members 4 are joined to the stress transmission member 5. As a result, the stress transmission member 5 is temporarily welded to the pile head 2 by welding, for example, as compared with the case where the stress transmission member 5 is individually welded to the pile head 2 by the number of plate-shaped members 4. After that, all four adjacent plate-shaped members can be joined by horizontal fillet welding, and workability and work efficiency can be improved.

Further, if the annular stress transmission member 5 is joined to the pile head 2, the pile head 2 can be continuously reinforced in the circumferential direction thereof, and even if the upper member 9 is omitted, a considerable strength is secured. can do.

1 Pile 2 Pile head 2a Outer surface of pile head 3 Pile head reinforcement structure 4 Plate-like material 4a Plate-like material plate surface 5 Stress transmission member 5a Stress transmission member plate surface 5b Inner edge of stress transmission member 6 Penetration Hole 7 Protruding part 8 Lower member 9 Upper member 10 Expansion part C Foundation concrete G Ground

Claims (6)

It is a structure for reinforcing the pile head that protrudes upward from the ground and is buried in the foundation concrete.
The pile head is projected outward in the radial direction in a vertical vertical direction so as to be lateral to the outer peripheral surface of the pile head, without being directly joined to the pile head and around the pile head. A plurality of plate-shaped materials provided at appropriate intervals in the direction, a first joint portion to be joined to the pile head in order to join the plate-shaped material to the pile head, and the plate-shaped material. A stress transmission member having a second joint portion to be joined and transmitting stress between the pile head and the plate-shaped material, and each of the above-mentioned plate-shaped materials are formed so as to penetrate in the plate thickness direction. Each of the plate-shaped materials is provided with a through hole and a protruding portion projecting from the plate surface around the through hole in the circumferential direction of the pile head.
The plate-shaped material is provided by being joined to the pile head via the stress transmission member.
A pile head reinforcing structure characterized in that the plate-shaped material and the stress transmission member are embedded in the foundation concrete placed around the pile head. A claim, wherein the stress transmitting member comprises a lower member joined to the lower portion of the plate-shaped material in a vertical direction and an upper member joined to the upper portion of the plate-shaped material. The pile head reinforcement structure according to 1. The pile head reinforcing structure according to claim 1 or 2, wherein the stress transmitting member is arranged so as not to overlap the protruding portion in the vertical direction. The pile head reinforcing structure according to any one of claims 1 to 3, wherein an expansion portion is formed in the stress transmission member so as to project outward in the radial direction of the pile head. The pile head reinforcing structure according to claim 4, wherein the expansion portion is arranged in the circumferential direction of the pile head so as not to protrude from the protruding portion. The pile head reinforcing structure according to any one of claims 1 to 5, wherein the stress transmission member is formed in an annular shape surrounding the outer peripheral surface of the pile head.

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