JP2019143475A - Pile head reinforcement structure - Google Patents

Abstract

To provide a pile head reinforcement structure which can sufficiently secure a stress transfer action and a fixing force, can reduce possibility such as to cause interference with bar arrangement buried in the foundation, facilitates a work of providing the pile head part so as to transfer the stress, and can appropriately secure a structural strength.SOLUTION: A pile head reinforcement structure has a pile head reinforcement member 3 whose an upper side is buried in the foundation in order to transmit a force acting on a pile head part 1a between a pile 1 and foundation 2 and a lower side is provided so as to transfer a stress to a steel-made portion of the pile head part, in which the pile head reinforcement member has a lateral plate-like portion 3h striding right above the pile head part, the lateral plate-like portion connects vertical plate-like portions 3a arranged on both sides of the pile head part, in the pile head reinforcement member, the lateral plate-like portion is joined to the pile head part to transfer a stress with the steel-made portion of the pile head part, and a through hole 3b penetrating the vertical plate-like portion in a lateral direction and a projection part 3d projecting from the surface of the vertical plate-like portion are provided.SELECTED DRAWING: Figure 9

Description

  The present invention can sufficiently ensure the stress transmission action and the fixing force, reduce the possibility of interference with the reinforcing bar embedded in the foundation, and can transmit the stress to the pile head. The present invention relates to a pile head reinforcing structure capable of facilitating the work to be provided and capable of appropriately securing the structural strength.

  In order to transmit the force acting on the pile head between the pile and the foundation, the pile head has a pile head reinforcing member in which the upper side is embedded in the foundation and the lower side is provided so as to be able to transmit stress to the pile head Patent Document 1 is known as a reinforcing structure.

  The “connection method between ready-made piles and foundation slabs” in Patent Document 1 aims to provide a method for firmly connecting the ready-made piles and foundation slabs with a small amount of reinforcing bars, and has a diameter larger than the outer diameter of the ready-made piles. After attaching a short metal pipe with a guide on the inside and a reinforcing bar welded on the outside to the pile head part of the ready-made pile, the concrete for forming the foundation slab in the gap between the short metal pipe and the ready-made pile While filling and reinforcing the pile head, the ready-made pile and the formed foundation slab are integrated.

Japanese Patent Laid-Open No. 10-266227

  In Patent Document 1, a rebar having a circular cross section is generally welded to a short pipe. When using reinforcing bars to transmit the bending moment and axial force acting on the pile head between the foundation and the pile, in order to ensure sufficient stress transmission and firmly fix the reinforcing bars, 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 reinforcing bars, irregularly shaped reinforcing bars with irregularities are used in order to ensure good fixation, and since joining is performed by flare welding, the welding technique is extremely difficult and welding defects are likely to occur.

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

  The present invention was devised in view of the above-described conventional problems, and it is possible to sufficiently ensure the stress transmission action and the fixing force, and there is a possibility that interference with the bar arrangement embedded in the foundation occurs. An object of the present invention is to provide a pile head reinforcement structure that can be reduced and can facilitate the work to transmit stress to 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 pile head reinforcing structure according to the present invention has an upper side embedded in the foundation and a lower side made of steel of the pile head. The pile head reinforcement structure which has a pile head reinforcement member provided so that stress transmission is possible with a part, Comprising: The said pile head reinforcement member is joined to the said pile head, and the up-down direction which transmits stress between the said steel parts The pile head reinforcing member, comprising: a vertically oriented plate-like portion; a through-hole penetrating the vertically oriented vertically oriented plate-like portion laterally; and a protrusion protruding from the surface of the vertically oriented vertically oriented plate-like portion. The vertical plate-like portion in the vertical direction has a joining peripheral surface portion facing the steel portion, and the joining peripheral surface portion is formed of a steel hollow cylinder that is welded to the steel portion. It is characterized by.

  In order to transmit the force acting on the pile head between the pile and the foundation, the pile head reinforcing structure according to the present invention has an upper side embedded in the foundation and a lower side made of steel of the pile head. The pile head reinforcement structure which has a pile head reinforcement member provided so that stress transmission is possible with a part, Comprising: The said pile head reinforcement member is joined to the said pile head, and the up-down direction which transmits stress between the said steel parts The pile head reinforcing member, comprising: a vertically oriented plate-like portion; a through-hole penetrating the vertically oriented vertically oriented plate-like portion laterally; and a protrusion protruding from the surface of the vertically oriented vertically oriented plate-like portion. The vertical plate-like portion in the vertical direction includes a steel hollow cylinder surrounding the pile head with a gap, and an inner peripheral surface of the steel hollow cylinder with a gap from the pile head. The vertical plate-shaped portion in the vertical direction is filled in the hollow cylindrical body. Through the filler being characterized in that it is joined to the pile head.

  The protrusion is formed in a form surrounding the through hole from its periphery.

  In order to transmit the force acting on the pile head between the pile and the foundation, the pile head reinforcing structure according to the present invention has an upper side embedded in the foundation and a lower side made of steel of the pile head. A pile head reinforcing structure having a pile head reinforcing member provided so as to be able to transmit stress to the portion, wherein the pile head reinforcing member includes a lateral plate-like portion straddling the pile head in a lateral direction, the lateral plate The shaped portion connects the vertically oriented plate-like portions arranged on both sides of the pile head across the pile head, and the pile head reinforcing member is connected to the steel portion of the pile head. At least one of the vertical plate portion and the horizontal plate portion is joined to the pile head and penetrates the vertical plate portion horizontally. And a projecting portion projecting from the surface of the vertical plate-like portion in the vertical direction. Characterized in that it obtain.

  The protrusion is formed in a form surrounding the through hole from its periphery.

  It has a through-hole penetrating the laterally plate-like portion laterally, and a protrusion protruding from the surface of the laterally plate-like portion.

  An annular steel ridge is formed on the pile head along the circumferential direction, and the pile head reinforcing member is joined to the ridge.

  The pile head is formed in a hollow cylindrical shape, and the lateral plate-like portion includes a dam member for damming the concrete that forms the foundation.

  The pile head is formed in a hollow cylindrical shape, and the lateral plate-like portion includes a hanging portion that hangs inward of the pile head, and the lower end of the hanging portion has an inward side of the pile head. A partition member for vertically partitioning is provided, and further includes a through-hole penetrating the hanging portion laterally and a protruding portion protruding from the surface of the hanging portion.

  In the pile head reinforcement structure according to the present invention, it is possible to sufficiently ensure the stress transmission action and the fixing force, reduce the possibility of interference with the reinforcing bar embedded in the foundation, and to the pile head. On the other hand, it is possible to facilitate the work to be able to transmit stress, and to ensure appropriate structural strength.

It is a side view showing a 1st embodiment of a pile head reinforcement structure concerning the present invention. It is explanatory drawing explaining the through-hole and protrusion which are provided in the pile head reinforcement structure shown in FIG. It is a perspective view explaining application of the bar arrangement to the pile head reinforcement structure shown in FIG. It is a perspective view which shows the modification of the pile head reinforcement structure which concerns on 1st Embodiment. It is a side view which shows 2nd Embodiment of the pile head reinforcement structure which concerns on this invention. It is a perspective view of the pile head reinforcement structure shown in FIG. It is a sectional side view which shows the modification of the pile head reinforcement structure which concerns on 2nd Embodiment. It is a perspective view which shows 3rd Embodiment of the pile head reinforcement structure which concerns on this invention. It is a perspective view which shows 4th Embodiment of the pile head reinforcement structure which concerns on this invention. It is explanatory drawing explaining the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the components used for the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 1st modification of 4th Embodiment. It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 2nd modification of 4th Embodiment. It is explanatory drawing explaining the components used for the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 3rd modification of 4th Embodiment. It is explanatory drawing which each shows the planar view and side view of the pile head reinforcement member which is a part of components used for the pile head reinforcement structure shown in FIG. It is explanatory drawing which each shows the planar view and side view of the assembly state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on the 4th modification of 4th Embodiment. It is explanatory drawing which each shows the planar view and side view of the assembly state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on the 5th modification of 4th Embodiment. It is a perspective view which shows 5th Embodiment of the pile head reinforcement structure which concerns on this invention. It is explanatory drawing explaining the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the components used for the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 1st modification of 5th Embodiment. It is explanatory drawing explaining the structural component example of the pile head reinforcement member which is a part of components used for the pile head reinforcement structure shown in FIG. It is explanatory drawing which each shows the planar view and side view of the assembly state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on the 2nd modification of 5th Embodiment. It is explanatory drawing which each shows the planar view and side view of the assembly state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on the 3rd modification of 5th Embodiment.

  EMBODIMENT OF THE INVENTION Below, the preferred embodiment of the pile head reinforcement structure concerning this invention is described in detail with reference to an accompanying drawing. FIG. 1 is a side view of a pile head reinforcing structure according to the first embodiment, FIG. 2 is an explanatory view for explaining through holes and protrusions provided in the pile head reinforcing structure shown in FIG. 1, and FIG. It is a perspective view explaining application of the bar arrangement to the pile head reinforcement structure shown in FIG.

  Although various piles are well-known, the pile head reinforcement structure which concerns on this embodiment is a steel pipe pile which has a steel pipe part (in the figure, the case where a pile head itself is a steel pipe part is shown) in the pile head 1a at least. It is applied to piles 1 such as (S pile) and high-strength concrete pile with outer shell steel pipe (SC pile). In the foundation 2, a foundation rebar 2a is embedded. And when embedding the pile head 1a of the pile 1 in the foundation 2, in order to transmit the force which acts on the pile head 1a between the pile 1 and the foundation 2, the pile head reinforcement member 3 is arrange | positioned. Is done.

  The pile head reinforcing member 3 has an upper side embedded in the foundation 2 and a lower side provided to be able to transmit stress to the steel portion of the pile head 1a. Conventionally, deformed reinforcing bars are used as the pile head reinforcement members. In this case, the pile and the foundation are rigidly joined by flaring the deformed reinforcing bars to the steel pipe part and fixing the reinforcing bars to the foundation ( Fixed).

  As shown in FIGS. 1 and 3, the pile head reinforcing structure according to the first embodiment is long in the vertical direction along the pile core of the pile 1 as a pile head reinforcing member 3 instead of the conventional deformed reinforcing bar, A vertically extending plate-like portion 3a, a vertically extending plate-like portion 3a, and a through-hole 3b penetrating horizontally along the left-right direction intersecting the up-down direction, and the surface of the vertically-oriented vertical plate-like portion 3a It is comprised using the steel members provided with the protrusion part 3d (refer FIG. 2) which protrudes from 3c.

  A plurality of pile head reinforcing members 3 are arranged at intervals around the pile head 1a. In the illustrated example, the pile head reinforcing members 3 are piled in a radial direction centered on the pile core at equal intervals around the pile head 1a (at intervals of 60 ° around the pile head 2a). Six pieces are arranged in a protruding manner from the head 1a.

  In the present embodiment, the entire vertical plate-like portion 3a in the vertical direction of the pile head reinforcing member 3 is formed of a single steel plate having an appropriate constant thickness. In the illustrated example, the steel plate is formed in a vertically long rectangular shape, but may have other shapes as long as the joining surface portion 3e described later is in contact with the steel portion of the pile head 1a. .

  The vertical plate-like portion 3a in the vertical direction of the pile head reinforcing member 3 is welded and joined to the steel portion of the pile head 1a by a general welding technique such as fillet welding. Stress transmission between the two is ensured. In addition, the vertical plate-like portion 3a in the vertical direction of the pile head reinforcing member 3 is embedded in the concrete whose upper side forms the foundation 2, whereby the force acting on the pile head 1 a is applied to the pile 1 and the foundation 2. The action of transmitting between the two is ensured.

  In the illustrated example, the vertical plate-like portion 3a in the vertical direction of the pile head reinforcing member 3 has a vertical length (lower side length) L1 that is welded to the steel portion of the pile head 1a. The vertical length (upper side length) L2 that protrudes upward from the pile head 1a and is embedded in the foundation 2 is set. Depending on the strength of the weld joint and the fixing performance with the foundation 2, the vertical length L1 may be longer than the vertical length L2, or the vertical length L1 and the vertical length L2 may be set to substantially the same length. .

  Specifically, the vertically vertical plate-like portion 3a of the pile head reinforcing member 3 has a joint surface portion 3e facing the steel portion of the pile head 1a among several surfaces that define the outer shape, In a state where the joining surface portion 3e is abutted against the steel portion, both are welded.

  In the first embodiment, the joint surface portion 3e is a plate end surface other than the plate surface 3c of the steel plate (vertical portion 3a in the vertical direction). In the case of the rectangular steel plate according to the illustrated example, one of the two flat plate end surfaces other than the two plate surfaces 3c is one of the two plate end surfaces in the vertical direction along the pile core. It is set as the joint surface part 3e abutted on the steel part of 1a and weld-joined. The joint surface portion 3e is flat and abuts in a manner in contact with the steel portion, and is welded and joined to the steel portion by a general welding technique such as fillet welding.

  FIG. 2 is an explanatory view for explaining the through hole 3b and the protruding portion 3d. FIG. 2 (A) shows a case in which the through hole 3b and the projecting portion 3d are provided integrally with the vertically extending plate-like portion 3a. Fig. 2C shows a case where a protrusion 3d with a through hole 3b is provided separately from the vertical plate portion 3a in the vertical direction, and Fig. 2 (C) shows the vertical plate portion in which the through hole 3b is formed. The case where the protrusion part 3d which has the hole 3f is provided in 3a separately is shown.

  The through hole 3b formed in the vertical plate-like portion 3a in the vertical direction allows the concrete placed for constructing the foundation 2 to smoothly flow around the pile head reinforcing member 3 through the through hole 3b. At the same time, the concrete is firmly and uniformly attached to the pile head reinforcing member 3 so that they are reliably integrated.

  Moreover, the protrusion 3d provided in the vertical plate-like portion 3a in the vertical direction improves the fixability of the pile head reinforcing member 3 to the concrete adhering to the periphery of the pile head reinforcing member 3, and the bending moment acting on the pile head 1a The action of transmitting the shear force and axial force between the pile 1 and the foundation 2 is ensured.

  In the case of FIG. 2A, the through hole 3b is formed in the steel plate (vertical plate portion 3a in the vertical direction) by burring, and the rising portion generated at that time is the protruding portion 3d.

  In the case of FIG. 2B, a long pipe piece having a through-hole 3b and having a length longer than the plate thickness of the vertical vertical plate-like portion 3a is formed in the vertical vertical plate-like portion 3a. The long pipe piece is formed as the protruding portion 3d so as to be bonded and fixed inside the hole 3g.

  In the case of FIG. 2C, a through-hole 3b is formed in the vertical plate-like portion 3a in the vertical direction, and a short pipe piece having a hole 3f having substantially the same diameter as the through-hole 3b is passed through the hole 3f. The holes 3b are aligned and joined and fixed to the plate surface 3c of the vertically-oriented plate-like portion 3a in the vertical direction, and the short pipe piece is used as the protruding portion 3d.

  In the example of illustration, the protrusion part 3d is formed in the form which surrounds the through-hole 3b from the circumference | surroundings. Therefore, four through holes 3b and four protrusions 3d are formed in the same number. If formed in this way, the concrete flowing through the through-hole 3b is smoothly fed around the protruding portion 3d to ensure dense adhesion, and at the same time, the fixing performance is improved by the protruding portion 3d. However, the through holes 3b and the protrusions 3d may be formed separately and individually at different positions, and thus may be formed in different numbers.

  Explaining the action of the pile head reinforcing structure according to the first embodiment, as shown in FIG. 1, the pile head reinforcing member 3 is vertically oriented vertically on the steel portion of the pile head 1 a protruding from the ground surface G. The lower part side of the plate-like part 3a is welded, and the pile head reinforcing member 3 is joined to the pile head part 1a. Thereby, the pile head reinforcement member 3 protrudes upwards from the pile head 1a.

  Next, after arranging the reinforcing bars 2a to be embedded in the foundation 2, the concrete for constructing the foundation 2 is placed so that the reinforcing bars 2a, the upper side of the pile head reinforcing member 3 and the pile head 1a are embedded. To do. The bending moment, shearing force, and axial force acting on the pile head 1a are transmitted between the foundation 2 and the pile 1 by the pile head reinforcing member 3 by placing concrete.

  In the pile head reinforcement structure according to the first embodiment, instead of a conventional reinforcing bar, a pile head reinforcement member 3 having the above-described configuration is provided, and a vertical plate-like portion 3a in the vertical direction of the pile head reinforcement member 3 is provided. The through hole 3b and the protruding portion 3d provided can improve the fixing property to the concrete while ensuring the filling property of the concrete. Therefore, the short pile head reinforcing member 3 is used to appropriately and effectively transmit the stress. Sufficiently can be ensured, and furthermore, the possibility of interference with the foundation rebar 2a embedded in the foundation 2 can be reduced.

  Moreover, the pile head reinforcement member 3 has the vertical direction vertical plate-shaped part 3a, and is welded and joined to the steel part of the pile head 1a by a general welding technique, unlike the irregularly shaped reinforcing bar having unevenness. Therefore, it is possible to facilitate the work to be able to transmit stress to the pile head 1a, and at the same time, it is possible to appropriately prevent the occurrence of welding defects and ensure the structural strength.

  Since the protrusion 3d is formed so as to surround the through hole 3b from its periphery, these protrusions 3d and the through hole 3b can be reasonably and efficiently compared to the case where the protrusion 3d and the through hole 3b are separately formed. Both can be provided, and a large number of these can be provided even in a narrow space, and the concrete that flows with good fillability through the through-hole 3b is smoothly fed around the protruding portion 3d. Close adhesion can be ensured.

  Since the vertical plate-like portion 3a in the vertical direction of the pile head reinforcing member 3 has a joining surface portion 3e facing the steel portion, and the joining surface portion 3e is formed by a steel plate welded to the steel portion. Even if it is short, a wide fixing area is ensured, and the pile head reinforcing member 3 can be transmitted to the steel portion of the pile head 1a by an easy and reliable joining operation using the joint surface portion 3e. Can be provided.

  A plurality of steel plates constituting the vertically oriented plate-like portion 3a are arranged at intervals around the pile head 1a, and the joint surface portion 3e is a plate end surface of the steel plate, so that the plate surface 3c is a pile. With a plurality of steel plates spreading outward from the head 1a, it is possible to secure a wide fixing area and reinforce the pile head 1a accurately and sufficiently.

  As shown in FIG. 3, the foundation rebar 2 a constructed on the foundation 2 may be inserted through the through hole 3 b of the pile head reinforcing member 3. Thereby, the bending proof strength and shear strength with respect to the bending moment and shearing force which act on the pile head 1a can be improved. Moreover, in place of the foundation rebar 2a, in order to further enhance the fixing performance between the pile head reinforcing member 3 and the concrete around the pile head 1a, a plurality of reinforcing bars arranged around the outer peripheral surface of the pile head 1a are provided. You may make it prepare separately and insert these reinforcement reinforcing bars in the through-hole 3b of the pile head reinforcement member 3, respectively. In this case, if the ends of the reinforcing reinforcing bars are connected to each other by a generally known joint means, the fixing performance can be further enhanced, and at the same time, the cooperation associated with the integration of the plurality of pile head reinforcing members 3 arranged together. The effect | action as a pile head reinforcement structure can be improved by an effect | action.

  FIG. 4 is a perspective view showing a modification of the pile head reinforcing structure according to the first embodiment. In this modified example, the joint surface portion 3e of the vertically vertical plate-like portion 3a is a plate surface 3c of a steel plate instead of the plate end surface of the above embodiment.

  The plate surface 3c is pressed against the steel portion of the pile head portion 1a, and welding joining to the steel portion is performed around the plate surface 3c. In this modification, instead of welding joining, bolt joining may be used that is simple in work and has a constant joining quality. In this modified example, a part of the through hole 3b is attached to the pile head 1a, but the other points are the same as those of the above embodiment, and the same effects can be obtained.

  5 and 6 show a second embodiment of a pile head reinforcing structure according to the present invention. FIG. 5 is a side view of a pile head reinforcing structure according to the second embodiment, and FIG. 6 is a perspective view of the pile head reinforcing structure shown in FIG.

  Unlike 1st Embodiment using a steel plate, 2nd Embodiment has the vertical direction vertical plate-shaped part 4a of the pile head reinforcement member 4 formed with a steel hollow cylinder. In other words, the vertical plate-like portion 4a in the vertical direction of the pile head reinforcing member 4 has a flat plate shape in the first embodiment, but in the second embodiment, it has a cylindrical shape that is processed and formed from a plate-like material. The outer shape of the hollow cylinder is usually formed in a cylindrical shape in accordance with the steel portion of the pile head 1a. In other words, as long as it matches the shape of the pile head 1a, in other words, other shapes may be used as long as the shape conforms to the shape of the steel portion.

  The hollow cylindrical body-like vertical plate-like portion 4a is formed with an inner diameter dimension slightly larger than the outer diameter dimension of the steel portion of the pile head 1a. Thereby, when the pile head reinforcing member 4 is mounted on the pile head 1a, the vertical plate-like portion 4a in the vertical direction is in close contact with the outer peripheral surface of the pile head 1a with almost no gap. And let the internal peripheral surface of a hollow cylinder be a joining peripheral surface part which faces a steel part. The lower side of the vertically-oriented vertical plate-like portion 4a having the joining peripheral surface portion is welded and joined to the pile head portion 1a along the circumference thereof using a general welding technique such as fillet welding. In addition, the welding joining of the vertical cylindrical plate-like portion 4a in the vertical direction and the pile head portion 1a is located at the upper end of the steel pipe portion of the pile head portion 1a on the inner peripheral surface of the hollow cylinder that is the joining peripheral surface portion. The part to be welded may be welded over the entire circumference.

  Thereby, the upper side of the vertical plate-like portion 4 a in the vertical direction is embedded in the foundation 2. The through hole 3b and the protruding portion 3d described in the first embodiment are formed in the hollow cylindrical body-like vertical plate-like portion 4a over the entire circumference.

  As in the first embodiment, the pile head reinforcing structure according to the second embodiment is also filled with concrete by the through-holes 3b and the protruding portions 3d provided in the vertically oriented plate-like portion 4a of the pile head reinforcing member 3. It is possible to improve the fixing property to the concrete while ensuring the property, so that the stress transmission action can be ensured appropriately and sufficiently by using the short pile head reinforcing member 4, and further embedded in the foundation 2 It is possible to reduce the possibility of interference with the basic reinforcing bar 2a.

  Moreover, the pile head reinforcement member 4 has a hollow cylindrical body-like vertically oriented plate-like portion 4a, and can be welded and joined to the steel portion of the pile head 1a by a general welding technique. Therefore, it is possible to facilitate the work to be able to transmit stress to the pile head 1a, and at the same time, it is possible to appropriately prevent the occurrence of welding defects and ensure the structural strength.

  FIG. 7 is a side sectional view showing a modification of the pile head reinforcing structure according to the second embodiment. In the second embodiment, the pile head reinforcing member 4 is formed such that the hollow cylindrical body-like vertical plate-like portion 4a has an inner diameter that is slightly larger than the outer diameter of the steel portion of the pile head 1a. In this modification, the outer diameter dimension is slightly smaller than the inner diameter dimension of the steel portion of the pile head 1a. Thereby, when the pile head reinforcement member 4 is mounted on the pile head 1a, the vertical plate-like portion 4a in the vertical direction is in close contact with the inner peripheral surface of the pile head 1a with almost no gap. And let the outer peripheral surface of a hollow cylinder be a joining peripheral surface part which faces a steel part. Other configurations are the same as those of the second embodiment. Even in such a modification, it is needless to say that the same effects as those of the first and second embodiments can be obtained.

  FIG. 8 is a perspective view showing a third embodiment of a pile head reinforcing structure according to the present invention. In the third embodiment, the means for providing the lower part side of the pile head reinforcing member 5 to the steel portion of the pile head 1a so as to be able to transmit stress is replaced with welded joints of concrete or other grout material forming the foundation 2 This is the case by filling. The vertical plate-like portion in the vertical direction of the pile head reinforcing member 5 includes a steel hollow cylinder 5a in which no through hole is formed, and a steel plate 5b in which a through hole 3b and a protrusion 3d are formed.

  The hollow cylinder 5a surrounds the pile head 1a and is provided on the ground surface G around the pile head 1a. The inner peripheral surface of the hollow cylinder 5a and the outer peripheral surface of the pile head 1a are spaced apart from each other in order to fill the concrete and the like therebetween. On the inner peripheral surface of the hollow cylinder 5a, a steel plate 5b is welded and provided at intervals along the circumferential direction, preferably at equal intervals. The steel plate 5b may be provided by welding not only on the inner peripheral surface of the hollow cylinder 5a but also on the outer peripheral surface.

  The steel plate 5b is provided so as to protrude inward from the inner peripheral surface of the hollow cylinder 5a along a radial direction centered on a pile core (axial core of the hollow cylinder 5a). The steel plate 5b has a plate end surface joined to the hollow cylinder 5a and a plate surface along a radial direction centered on the pile core. The steel plate 5b is arrange | positioned so that a clearance gap may be separated between the outer peripheral surfaces of the pile head 1a. The steel plate 5b is formed with the above-described through hole 3b and protrusion 3d.

  The pile head reinforcing member 5 is disposed so as to surround the pile head 1a from the outside, and is a concrete that joins the pile head reinforcing member 5 to the pile head 1a so as to transmit stress to the inside of the hollow cylinder 5a. Etc. are filled.

  In the pile head reinforcing structure according to the third embodiment, the pile head reinforcing member 5 having the above-described configuration is provided, and the through hole 3b and the protrusion provided in the steel plate 5b constituting the vertical plate portion in the vertical direction are projected. With the portion 3d, it is possible to improve the fixability to concrete and the like while securing the filling property of concrete and the like, and to ensure an appropriate and sufficient stress transmission effect using the short pile head reinforcing member 5 In addition, the possibility of interference with the foundation rebar 2a embedded in the foundation 2 can be reduced.

  Moreover, since the pile head reinforcement member 5 can be provided by being connected to the pile head 1a by filling with concrete or the like so as to be able to transmit stress, the joining operation can be facilitated by a simple filling operation, The structural strength can be appropriately secured by suppressing the occurrence of structural defects.

  9 to 18 show a fourth embodiment of a pile head reinforcing structure according to the present invention. The fourth embodiment is preferable when applied to a hollow cylindrical pile, such as a steel pipe pile (S pile). FIG. 9 is a perspective view of a pile head reinforcing structure according to the fourth embodiment, FIG. 10 is an explanatory view for explaining the pile head reinforcing structure shown in FIG. 9, and FIG. 10 (b) is a front view, FIG. 10 (c) is a side view, FIG. 10 (d) is a cross-sectional view taken along line AA in FIG. 10 (a), and FIG. 11 is a pile head shown in FIG. It is explanatory drawing explaining the components used for a reinforcement structure, Comprising: (a) And (b) is a front view of a pile head reinforcement member, respectively, FIG. 12 is the pile which concerns on the 1st modification of 4th Embodiment. It is explanatory drawing explaining a head reinforcement structure, Comprising: Fig.12 (a) is a perspective view, FIG.12 (b) is a BB sectional view taken on the line in Fig.12 (a), FIG. It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 2nd modification of embodiment, Comprising: Fig.13 (a) is a perspective view, FIG.13 (b) is CC line arrow in FIG.13 (a). FIG. 14 is a cross-sectional view. It is explanatory drawing explaining the components used for the pile head reinforcement structure shown in FIG. 13, Comprising: Fig.14 (a) is a top view of a dam member, FIG.14 (b) is a top view of the other example of a dam member FIG. 15 is an explanatory diagram for explaining a pile head reinforcing structure according to a third modification of the fourth embodiment, in which FIG. 15 (a) is a perspective view and FIG. 15 (b). FIG. 15A is a cross-sectional view taken along line D-D in FIG. 15A, and FIG. 16 is a plan view and a side view of a pile head reinforcing member that is a part of a part used in the pile head reinforcing structure shown in FIG. 15. FIG. 17 is an explanatory diagram showing a plan view and a side view of an assembled state of a pile head reinforcing member applied to a pile head reinforcing structure according to a fourth modification of the fourth embodiment, and FIG. These are a plan view and a side view of the assembled state of the pile head reinforcing member applied to the pile head reinforcing structure according to the fifth modification of the fourth embodiment. Re is an explanatory view showing, respectively.

  First, if 4th Embodiment is described with reference to FIGS. 9-11, the pile head reinforcement member 3 is provided with the horizontal plate-shaped part 3h made from steel straddling the pile head 1a right above in a horizontal horizontal direction. The horizontal plate-like portion 3h is connected to the vertical plate-like portion 3a in the vertical direction, for example, the vertical plate-like portion 3a in the vertical direction described in the first embodiment.

  The horizontal plate-like portion 3h is, for example, a plate end surface in a straddling direction among the four plate end surfaces other than the plate surface 3c, with the plate surface 3c on the front and back sides of the surface defining a planar rectangular outer shape being directed horizontally. Is directed to the vertical plate-like portion 3a in the vertical direction, and one of the pair of plate end faces in the direction intersecting with the straddling direction (becomes the joint surface portion 3e described above) is directed to the upward top surface 1b of the pile head 1a. It is provided in a state where the plate surface 3c stands up right above the pile head 1a so that the plate end surface of the plate faces upward.

  The horizontally oriented plate-like portion 3h connects the vertically oriented plate-like portions 3a arranged on both sides of the pile head 1a with the pile head 1a interposed therebetween. Accordingly, the pile head reinforcing member 3 includes a horizontal plate-like portion 3h at the center in the direction straddling the pile head 1a in the horizontal horizontal direction, and the vertical plate-like portions 3a in the vertical direction are provided at both ends of the horizontal plate-like portion 3h. It is prepared for.

  In the illustrated example, the pile head reinforcing member 3 has a vertically extending plate-like portion 3a and a horizontally extending plate-like portion 3h formed integrally from a single plate material. Of course, the horizontal plate-like portion 3h and the vertical plate-like portion 3a may be formed separately and joined together.

  Further, in the illustrated example, the pile head 1a has a circular cross section, and the pile head reinforcing member 3 has the pile head so that the lateral plate-like portion 3h passes through the center (pile core) of the pile head 1a. It arrange | positions so that the part 1a may be straddled in the diameter direction. However, the pile head reinforcement member 3 is not limited to straddling in the diametrical direction as long as the horizontally oriented plate-like portion 3h straddles directly above the pile head 1a. It may be a cross-girder shape described later).

  Moreover, in the example of illustration, the horizontal plate-shaped part 3h of the two pile head reinforcement members 3 is orthogonally arranged by the center (pile core) of the pile head 1a. Accordingly, four vertical plate-like portions 3a in the vertical direction are provided, and these vertical plate-like portions 3a in the vertical direction are arranged around the pile head 1a with an appropriate interval.

  As shown in FIG. 11, for example, a downward fitting groove 6 and an upward fitting groove 7 are formed at the center in the horizontal direction of each horizontal plate-shaped portion 3h so as to pass through them in the plate thickness direction. By fitting the grooves 6 and 7 up and down, the two pile head reinforcing members 3 are combined in a side-by-side plate-like portion 3h in a fitting structure.

  However, three or more pile head reinforcing members 3 may be used, and the horizontally oriented plate-like portions 3h may be arranged radially immediately above the pile head 1a to include six or more vertically oriented plate-like portions 3a. good. Assuming such a case, the assembly of the pile head reinforcing members 3 is not limited to the above-mentioned fitting structure, but radially circulates two or more laterally plate-like portions 3h in the circumferential direction of the pile head 1a. And are welded together. Alternatively, it is configured such that the plate end surface of another laterally plate-like portion 3h is abutted against the plate surface of any laterally-like plate-like portion 3h and welded.

  The horizontally oriented plate-like portion 3h is provided with a through hole 3b and a protruding portion 3d in the same manner as the above-described vertically oriented plate-like portion 3a. In the example of illustration, the four through-holes 3b and the protrusion part 3d are provided one each up and down on both sides of the center of the pile head 1a. A vertical plate portion 3a in the vertical direction on both ends of the horizontal plate portion 3h is also provided one above the other. Further, in the illustrated example, the protruding portions 3d of the continuous horizontal plate-like portion 3h and the vertical vertical plate-like portion 3a are all protruded in the same direction, but the protruding directions may be appropriately changed. .

  In short, the pile head reinforcing member 3 used in the fourth embodiment is connected to the vertical plate portion 3a in the vertical direction and in addition to the vertical plate portion 3a in the vertical direction, and is horizontally directed right above the pile head 1a. The plate-shaped portion 3h is provided with a transverse plate-shaped portion 3h extending in the direction, and each of the plate-shaped portions 3a and 3h is provided with a through hole 3b and a protruding portion 3d. By placing the plate end surface (joint surface portion 3e) of the horizontally oriented plate-shaped portion 3h directed to this, it is temporarily placed on the pile head 1a.

  In 4th Embodiment, since the pile head reinforcement member 3 transmits stress between the steel parts of the pile head 1a, at least any one of the up-down direction vertical plate-shaped part 3a and the horizontal plate-shaped part 3h is used. Is welded to the pile head 1a.

  In the illustrated example, the plate end surface of the laterally plate-like portion 3h directed to the upward top surface 1b of the pile head 1a is a joint surface portion 3e, and the upward top surface 1b of the joint surface portion 3e and the pile head 1a Are joined together by welding, whereby the vertically oriented plate-like portion 3a is joined to the pile head 1a by the horizontally oriented plate-like portion 3h itself, and also via the horizontally-oriented plate-like portion 3h. Stress transmission between the plate-like portions 3a and 3h and the steel portion is ensured.

  In 4th Embodiment, in addition to the vertical direction vertical plate-shaped part 3a of the pile head reinforcement member 3, stress transmission between steel parts is ensured by the horizontal plate-shaped part 3h. In addition, the vertical plate-like portion 3a and the horizontal plate-like portion 3h of the pile head reinforcing member 3 are embedded in the concrete that forms the foundation 2, whereby the force acting on the pile head 1a is applied to the pile 1 The action of transmitting between the base 2 and the foundation 2 is ensured.

  The action of the pile head reinforcing structure according to the fourth embodiment will be described. As shown in FIG. 9, the lateral plate-like portion of the pile head reinforcing member 3 is formed on the steel portion of the pile head 1 a protruding from the ground surface G. The joint surface portion 3e of 3h is welded, and the pile head reinforcing member 3 is joined to the pile head portion 1a. Thereby, the pile head reinforcement member 3 protrudes above the pile head 1a.

  Next, after arranging the reinforcing bars to be embedded in the foundation, concrete for constructing the foundation is placed so as to embed these reinforcing bars, the pile head reinforcing member 3 and the pile head 1a. The bending moment, the shearing force, and the axial force acting on the pile head 1a are transmitted between the foundation and the pile 1 by the pile head reinforcing member 3 by placing concrete.

  In the pile head reinforcement structure according to the fourth embodiment, the pile head reinforcement member 3 includes a lateral plate-like portion 3h straddling the pile head 1a directly in the lateral direction, and the lateral plate-like portion 3h is a pile head. Since it is constructed by connecting up and down vertical plate-like portions 3a arranged on both sides of the pile head 1a with the portion 1a in between, the horizontal plate-like portion 3h itself and the up-and-down via the horizontal plate-like portion 3h By joining the direction-longitudinal plate-like portion 3a to the pile head 1a, the stress transmission performance with the steel portion can be improved.

  By providing the horizontal plate-like portion 3h, it is possible to suppress the protruding amount of the vertical vertical plate-like portion 3a above the pile head 1a, and various arrangements such as the basic arrangement arranged just above the pile head 1a. Can be arranged evenly in the four directions of the pile head 1a. Moreover, since the pile head reinforcement member 3 protrudes toward the side from the pile head 1a, a big bending resistance force can be exhibited.

  Since the horizontal plate-like portion 3h is connected to the vertical vertical plate-like portion 3a, the strength of the pile head reinforcing member 3 itself can be increased. At the time of construction, the pile head reinforcing member 3 can be temporarily placed on the pile head 1a using the horizontally oriented plate-like portion 3h, and workability can be improved. The through-hole 3b and the protrusion 3d provided in the horizontally oriented plate-like portion 3h can ensure the same configuration and operational effects as the through-hole 3b and the protrusion 3d provided in the vertically-oriented vertical plate-like portion 3a.

  And even if it is such 4th Embodiment, of course, there exists an effect similar to the said 1st Embodiment.

  FIG. 12 shows a first modification of the pile head reinforcing structure according to the fourth embodiment. In the first modified example, the heel member 8 is welded and joined to the pile head portion 1a as an annular steel saddle portion along the circumferential direction on the annular upward top surface 1b to which the lateral plate-like portion 3h is joined. The joint surface portion 3e of the laterally plate-like portion 3h of the pile head reinforcing member 3 is welded to the flange member 8. Instead of the separate heel member 8, the pile head 1 a may be formed integrally with the pile head 1 a by subjecting the upward top surface 1 b of the pile head 1 a to expansion. The eaves member 8 may be previously joined to the pile head reinforcing member 3 side.

  In 4th Embodiment, since it welds and joins the joint surface part 3e of the horizontal plate-shaped part 3h with respect to the upward top surface 1b of the pile head 1a, while being able to ensure sufficient weld length, the pile head 1a The upward top surface 1b and its surroundings may cause local deformation due to stress concentration, but in the first modification, a long welding length can be secured by providing the flange member 8, and the steel portion and the pile A high bonding strength with the head reinforcing member 3 can be ensured. Moreover, the strength of the periphery of the upward top surface 1b of the pile head 1a that performs the stress transmission action can be increased by the flange member 8, and local deformation can be prevented.

  The 2nd modification of the pile head reinforcement structure which concerns on 4th Embodiment is shown by FIG.13 and FIG.14. The second modified example is for damming up the concrete for constructing the foundation in the laterally plate-like portion 3h of the pile head reinforcing member 3 when the pile head 1a is formed in a hollow cylindrical shape such as a steel pipe pile. The steel weir member 9 is provided.

  The weir member 9 is formed of a plate material having an outer diameter equal to or smaller than the inner diameter of the pile head 1a so as to be inserted inward of the pile head 1a. In the illustrated example, since the pile head 1a is circular in cross section, the weir member 9 is formed in a circular shape as shown in FIG. However, the dam member 9 is not limited to a circular shape as long as it can be inserted inward of the pile head 1a and dams the concrete, and may have a shape different from the flat cross section of the pile head 1a. . Further, in the illustrated example, the laterally plate-like portion 3h is formed with an extension portion 3i that can be inserted inwardly of the pile head 1a, and a weir member 9 is welded to the extension portion 3i.

  In the illustrated example, since the lateral plate-like portions 3h of the two pile head reinforcing members 3 are orthogonal to each other, the extension portion 3i is formed in a planar cross shape, and the weir member 9 is joined to the cross-like extension portion 3i. Has been. In the weir member 9, as shown in FIG. 14 (b), when the lateral plate-like portion 3h or the extension portion 3i is formed, the fitting groove 10 is formed in accordance with the form of the lower end side of the extension portion 3i. It may be formed and joined to the horizontally oriented plate-like portion 3h or the like via the fitting groove 10. In the illustrated example, a cross-shaped fitting groove 10 is shown.

  When the fitting groove 10 is formed, the dam member 9 may be formed by superposing and joining a plurality of plate pieces 9b spaced by an interval corresponding to the fitting groove 10 on one plate material 9a. .

  By the extension part 3i, the pile head reinforcing member 3 can be fitted to the pile head 1a to be positioned in the front / rear / left / right horizontal direction. Moreover, when setting the direction on the plane of the pile head reinforcing member 3, the pile head reinforcing member 3 can be rotated around the pile head 1a by using the extension portion 3i to set the direction.

  Even in the second modification, the pile head reinforcing member 3 is welded and joined to the joint surface portion 3e of the lateral plate-like portion 3h and the upward top surface 1b of the pile head portion 1a, thereby ensuring stress transmission. Is done. You may weld-join the edge of the dam member 9 to the inner surface of the pile head 1a. Furthermore, you may weld-join the extension part 3i to the inner surface of the pile head 1a. In the 2nd modification, since the dam member 9 for damming the concrete which constructs a foundation was provided, it can suppress that concrete enters into the pile 1 inside.

  Moreover, the dam member 9 and also the extension part 3i can ensure the welding length of the pile head reinforcement member 3 and the steel part long, and ensure high joint strength between the steel part and the pile head reinforcement member 3. Can do. Moreover, the strength around the upward top 1b surface of the pile head 1a that performs the stress transmission action can be enhanced by the weir member 9 and also the extended portion 3i.

  The 3rd modification of the pile head reinforcement structure which concerns on 4th Embodiment is shown by FIG.15 and FIG.16. In the pile head reinforcing member 3 used in the fourth embodiment shown in FIGS. 9 to 14, the vertical plate-like portion 3 a in the vertical direction is located above the pile head 1 a, but the second modification example As can be understood by comparing with FIG. 13 showing, in the third modified example, the vertical plate-like portion 3a in the vertical direction is suspended along the vertical direction along the pile core at the side of the pile head 1a. Has been.

  Therefore, in the third modified example, the pile head reinforcing member 3 can be welded and joined as described in the second modified example, and in the same manner as in the first embodiment, the vertically vertical plate-like portion. 3a can be welded to the pile head 1a, and both the plate-like portions 3a and 3h, and also the dam member 9 may be welded to the pile head 1a.

  Moreover, as shown in FIG. 16, as an assembly of the pile head reinforcement member 3, any pile head reinforcement member is used in the direction straddling the pile head 1a, without using the fitting groove 10 shown in FIG. 14 (b). In the center of the horizontal plate-like portion 3h of 3 is welded and joined to the horizontal plate-like portion 3h of the other pile head reinforcing member 3 in the straddling direction, and this is installed and constructed as a single unit 11 Also good.

  In the 3rd modification, the welding length of the pile head reinforcement member 3 with respect to the pile head 1a can be ensured long freely, and stress transmission performance can further be improved.

  FIG. 17 shows a fourth modification of the pile head reinforcing structure according to the fourth embodiment. In the pile head reinforcing member 3 of the fourth modified example, the through hole 3b and the protruding portion 3d of the lateral plate-like portion 3h are omitted from the first modified example shown in FIG.

  FIG. 18 shows a fifth modification of the pile head reinforcing structure according to the fourth embodiment. The pile head reinforcing member 3 of the fifth modified example is a laterally plate-like shape of four pile head reinforcing members 3 so as to surround the pile core with respect to the second modified example combined with the cross shape shown in FIG. The portion 3h is configured in a plane well pattern.

  In the 5th modification, since it is a plane cross-girder shape, the assembly 12 of the pile head reinforcement member 3 provided with the denseness and structural rigidity which can ensure a fixation area efficiently in the narrow space of the pile head 1a is comprised. And high stress transmission performance can be ensured.

  In any of the various modifications of the fourth embodiment described above, it is a matter of course that the same operational effects as the first and fourth embodiments can be obtained.

  19 to 25 show a fifth embodiment of a pile head reinforcing structure according to the present invention. The fifth embodiment is also preferable when applied to a hollow cylindrical pile, such as a steel pipe pile (S pile). 19 is a perspective view of a pile head reinforcing structure according to the fifth embodiment, FIG. 20 is an explanatory view for explaining the pile head reinforcing structure shown in FIG. 19, and FIG. 20 (a) is a plan view, FIG. 20 (b) is a side view, FIG. 20 (c) is a cross-sectional view taken along the line EE in FIG. 20 (a), and FIG. 21 illustrates components used in the pile head reinforcing structure shown in FIG. It is explanatory drawing, Comprising: Fig.21 (a) and (b) is a front view of a pile head reinforcement member, respectively, FIG.21 (c) is a top view of a partition member, FIG.22 is the 1st modification of 5th Embodiment. FIG. 22 (a) is a perspective view, FIG. 22 (b) is a cross-sectional view taken along line FF in FIG. 22 (a), and FIG. FIG. 23 is an explanatory diagram illustrating an example of a component part of a pile head reinforcing member that is a part of a part used in the pile head reinforcing structure shown in FIG. 22, and FIG. FIG. 23 (b) is an explanatory view showing a plan view and a side view of the hanging portion, respectively, and FIG. 24 is a pile head according to a second modification of the fifth embodiment. Explanatory drawing which respectively shows the planar view and side view of the assembly state of the pile head reinforcement member applied to a reinforcement structure, FIG. 25 is the pile head applied to the pile head reinforcement structure which concerns on the 3rd modification of 5th Embodiment. It is explanatory drawing which shows the planar view and side view of the assembly state of a reinforcement member, respectively.

  First, a fifth embodiment will be described with reference to FIGS. When the fifth embodiment is compared with the fourth embodiment shown in FIG. 9, the laterally plate-like portion 3a of the pile head reinforcing member 3 is suspended inwardly of a pile head 1a formed in a hollow cylindrical shape. The hanging portion 3j includes a steel plate-like partition member 13 which is welded and joined to the lower end of the hanging portion 3j and partitions the inside of the pile head 1a into an upper portion and a lower portion. A through hole 3b penetrating 3j sideways and a protruding portion 3d protruding from the surface of the hanging portion 3j are provided.

  The suspended portion 3j is a plate-shaped steel portion that is integrally suspended from the laterally-oriented plate-shaped portion 3h. Since the pile head reinforcing member 3 is configured in a cross shape, for example, as described above, the hanging portion 3j that hangs down to the inside of the pile head 1a is also positioned inside the pile head 1a in a cross shape. Is done.

  A partition member 13 is provided inside the pile head 1a, and concrete filling the inside of the pile head 1a is placed above the partition member 13. The partition member 13 is preferably welded to the inner surface of the pile head 1a. That is, 5th Embodiment joins the drooping part 3j and the steel pipe part in the pile head 1a by the casting concrete stuffed inside the pile head 1a inside. The configurations and operational effects of the through hole 3b and the protruding portion 3d are the same as in the above embodiment.

  FIG. 21 shows a component structure. For example, as in the case shown in FIG. 11, for example, one lateral plate-like portion 3h of two pile head reinforcing members 3 combined with each other and the other hanging portion 3j. At the center in the lateral direction, a downward fitting groove 14 and an upward fitting groove 15 are formed by penetrating them in the thickness direction. By fitting these fitting grooves 14 and 15 up and down, a horizontal plate shape is formed. The part 3h and the hanging part 3j are combined in a fitting structure, and the two pile head reinforcing members 3 are assembled.

  However, as explained in the fourth embodiment, three or more pile head reinforcing members 3 are used, their horizontally oriented plate-like portions 3h are arranged radially directly on the pile head 1a, and six or more vertical vertical directions are provided. You may make it provide the plate-shaped part 3a.

  Assuming such a case, the assembly of the pile head reinforcing members 3 is not limited to the above-mentioned fitting structure, but circulates two or more horizontally oriented plate-like portions 3h and hanging portions 3j in the circumferential direction of the pile head 1a. Thus, they are arranged radially and welded together. Alternatively, the plate end surfaces of the other lateral plate-like portions 3h and the suspended portions 3j are abutted and welded to the plate surfaces of any of the laterally-like plate-like portions 3h and the suspended portions 3j. Then, the partition member 13 is welded to the lower end of the assembled hanging part 3j.

  The action of the pile head reinforcement structure according to the fifth embodiment will be described. As shown in FIG. 19, the pile head reinforcement is performed while inserting the hanging portion 3j toward the inside of the pile head 1a protruding from the ground surface G. The member 3 is temporarily placed on the pile head 1a via the horizontally oriented plate-like portion 3h. Thereby, the horizontal plate-like portion 3h and the vertical plate-like portion 3a of the pile head reinforcing member 3 protrude above the pile head 1a, and the hanging portion 3j and the partition member 13 are inward of the pile head 1a. Installed.

  Next, after arranging the reinforcing bars to be embedded in the foundation, concrete for constructing the foundation is placed so as to embed these reinforcing bars, the pile head reinforcing member 3 and the pile head 1a. A part of the concrete is filled inward from the upward top portion 1b of the pile head 1a and filled in the pile head 1a above the partition member 13. With the concrete, the steel portion of the pile head 1a and the pile head reinforcing member 3, more specifically, the steel portion and the vertical plate portion 3a in the vertical direction are interposed via the hanging portion 3j and the horizontal plate portion 3h. , Joined.

  The bending moment, shearing force, and axial force acting on the pile head 1 a are also transmitted between the foundation 2 and the pile 1 by the pile head reinforcing member 3 by the placed concrete.

  In the pile head reinforcement structure according to the fifth embodiment, in addition to the configuration of the fourth embodiment, the laterally plate-like portion 3h is a suspended portion that hangs down to the inside of the pile head 1a of the hollow cylindrical body. 3j, and a lower end of the hanging portion 3j is provided with a partition member 13 for vertically dividing the inside of the pile head 1a, and further, a through hole 3b penetrating the hanging portion 3j sideways, and a surface of the hanging portion 3j Since the projecting portion 3d is provided so as to project from the head, the hanging portion 3j and the horizontally oriented plate-like portion 3h itself, and also the pile head of the vertically extending vertically oriented plate-like portion 3a via the suspended portion 3j and the horizontally oriented plate-like portion 3h By joining to the part 1a, the stress transmission performance with the steel part can be improved.

  Since the hanging part 3j is connected to the horizontally oriented plate-like part 3h and the vertically oriented plate-like part 3a, the strength of the pile head reinforcing member 3 itself can be increased. At the time of construction, the pile head reinforcing member 3 and the steel pipe portion can be joined by concrete, so that the amount of welding work for the joining can be reduced and workability can be improved. Moreover, the pile head reinforcement member 3 can be temporarily placed on the pile head 1a using the horizontally oriented plate-like portion 3h, and workability can be improved.

  The through-hole 3b and the protruding portion 3d provided in the hanging portion 3j can ensure the same effects as the through-hole 3b and the protruding portion 3d provided in the horizontally oriented plate-like portion 3h and the vertically-oriented vertical plate-like portion 3a. . By the hanging part 3j, the pile head reinforcing member 3 can be fitted to the pile head 1a and positioned in the front / rear / left / right horizontal direction. Moreover, when setting the direction on the plane of the pile head reinforcement member 3, the pile head reinforcement member 3 can be rotated around the pile head 1a and a direction can be set by utilizing the hanging part 3j.

  And even if it is such 5th Embodiment, of course, there exists an effect similar to the said 1st Embodiment and 4th Embodiment.

  The 1st modification of the pile head reinforcement structure which concerns on 5th Embodiment is shown by FIG.22 and FIG.23. The first modification is advantageous when the laterally plate-like portion 3h of the pile head reinforcing member 3 is welded to the pile head 1a.

  In contrast to the third modification of the fourth embodiment shown in FIG. 15, this first modification is welded to the pile head 1 a with an annular flange member 8, and the pile head 8 is reinforced with a pile head. The joint surface portion 3e of the laterally plate-like portion 3h of the member 3 is welded.

  In the fifth embodiment, the pile head reinforcing member 3 is joined to the steel portion by filling concrete inside the pile head 1a. In the first modified example, a rod member 8 capable of securing the weld length is provided. Thus, it is possible to weld the laterally plate-like portion 3h to the steel portion with an additional long welding length, and it is possible to ensure a high joint strength between the steel portion and the pile head reinforcing member 3. Moreover, the strength of the periphery of the upward top surface 1b of the pile head 1a that performs the stress transmission action can be increased by the flange member 8, and local deformation can be prevented.

  Further, as shown in FIG. 23, the pile head reinforcing member 3 is assembled not by the fitting structure shown in FIG. 21, but by using the hanging portion 3j with the partition member 13 as the first component 16, and the lateral plate-like portion 3h and A component mainly composed of the vertically oriented plate-like portion 3a may be manufactured as the second component 17, and these components 16 and 17 may be joined later to complete the assembly.

  FIG. 24 shows a second modification of the pile head reinforcing structure according to the fifth embodiment. The second modification corresponds to the fourth modification of the fourth embodiment. In the pile head reinforcing member 3 of the second modified example, the suspended portion 3j of any one of the pile head reinforcing members 3 is omitted from the plurality of pile head reinforcing members 3 with respect to the fifth embodiment shown in FIG. ing.

  FIG. 25 shows a third modification of the pile head reinforcing structure according to the fifth embodiment. The pile head reinforcing member 3 of the third modification corresponds to the fifth modification of the fourth embodiment, and surrounds the pile core with respect to the fifth embodiment combined in the cross shape shown in FIG. The four pile head reinforcing members 3 are configured by assembling the horizontally oriented plate-like portions 3h and the suspended portions 3j in a plane well pattern.

  In the 3rd modification, since it is a plane cross girder form, the assembly of pile head reinforcement member 3 provided with the denseness and structural rigidity which can secure a fixed area efficiently in the narrow space of pile head 1a is constituted. And high stress transmission performance can be ensured.

  In any of the various modifications of the fifth embodiment described above, it is a matter of course that the same operational effects as the first embodiment, the fourth embodiment, and the fifth embodiment can be obtained. .

  In the above-described embodiment, the case where the protruding portion 3d is protruded to one side of the vertically extending plate-like portion 3a has been described as an example, but it is needless to say that the protruding portion 3d may be protruded to both sides.

  Moreover, also about these 4th and 5th embodiment, as shown in FIG. 3, you may insert the foundation rebar 2a constructed in the foundation 2 in the through-hole 3b of the pile head reinforcement member 3 as a matter of course. is there.

DESCRIPTION OF SYMBOLS 1 Pile 1a Pile head 2 Foundation 3,4,5 Pile head reinforcement member 3a, 4a Vertical direction plate-like part 3b Through-hole 3c Plate surface 3d Projection part 3e Joining surface part 3h Lateral plate-like part 3j Drooping part 5a Hollow cylinder Body 5b Plate 8 Anchor member 9 Weir member 13 Partition member

Claims (9)

In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is embedded in the foundation, and the lower side is provided with the steel part of the pile head so as to be able to transmit stress. A pile head reinforcing structure having a reinforcing member,
The said pile head reinforcement member is joined to the said pile head, the vertical direction vertical plate-shaped part which transmits stress between the said steel parts, and the through-hole which penetrates this vertical direction vertical plate-shaped part horizontally And a projecting portion projecting from the surface of the vertical plate-like portion in the vertical direction,
The vertical plate-like portion in the vertical direction of the pile head reinforcing member has a joining peripheral surface portion facing the steel portion, and the steel hollow cylinder is welded and joined to the steel portion. Pile head reinforcement structure characterized by being formed by. In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is embedded in the foundation, and the lower side is provided with the steel part of the pile head so as to be able to transmit stress. A pile head reinforcing structure having a reinforcing member,
The said pile head reinforcement member is joined to the said pile head, the vertical direction vertical plate-shaped part which transmits stress between the said steel parts, and the through-hole which penetrates this vertical direction vertical plate-shaped part horizontally And a projecting portion projecting from the surface of the vertical plate-like portion in the vertical direction,
The vertical plate-like portion of the pile head reinforcing member includes a steel hollow cylinder that surrounds the pile head at a distance, and a steel hollow cylinder that is spaced from the pile head. It is composed of a steel plate joined to the inner peripheral surface of the body,
The pile head reinforcing structure characterized in that the vertical plate-like portion in the vertical direction is joined to the pile head via a filler filled in the hollow cylindrical body.   The pile head reinforcing structure according to claim 1, wherein the protruding portion is formed in a form surrounding the through hole from its periphery. In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is embedded in the foundation, and the lower side is provided with the steel part of the pile head so as to be able to transmit stress. A pile head reinforcing structure having a reinforcing member,
The pile head reinforcing member includes a lateral plate-like portion straddling the pile head directly in the lateral direction,
The horizontally oriented plate-like portion connects the vertically oriented plate-like portions arranged on both sides of the pile head across the pile head,
In order to transmit stress between the pile head reinforcing member and the steel portion of the pile head, at least one of the vertically oriented plate-like portion and the horizontally oriented plate-like portion is attached to the pile head. As it is joined
A pile head reinforcing structure comprising: a through-hole penetrating the vertical vertical plate-like portion laterally; and a protrusion protruding from the surface of the vertical vertical plate-like portion.   The pile head reinforcing structure according to claim 4, wherein the protruding portion is formed in a form surrounding the through hole from the periphery thereof.   6. The pile head reinforcing structure according to claim 4, comprising a through-hole penetrating the laterally plate-like portion laterally and a protrusion protruding from a surface of the laterally plate-like portion.   The pile head is formed with an annular steel ridge along the circumferential direction, and the pile head reinforcing member is joined to the ridge. The pile head reinforcement structure described in 1.   The said pile head is formed in a hollow cylinder shape, The said horizontal plate-shaped part is provided with the dam member for damming the concrete which constructs a foundation, The any one of Claims 4-7 characterized by the above-mentioned. Pile head reinforcement structure.   The pile head is formed in a hollow cylindrical shape, and the lateral plate-like portion includes a hanging portion that hangs inward of the pile head, and the lower end of the hanging portion has an inward side of the pile head. The partition member which partitions up and down is provided, Furthermore, it has a through-hole penetrating the said drooping part sideways, and the protrusion part projected from the surface of this drooping part, The any one of Claims 4-8 characterized by the above-mentioned. The pile head reinforcement structure as described in the term of.

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