JP2018071055A - Pile head reinforcement member and pile head reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile head reinforcement member and a pile head reinforcement structure capable of: securing sufficient stress conveyance capability between a pile and a foundation and sufficient fastening force to a pile head part; reducing a possibility of interference with a reinforcing bar embedded in the foundation; and enhancing construction work quality around the pile head part by reducing a number of welding processes and securing appropriate structural strength, as the reinforcement structure and a constituent member used therewith.SOLUTION: A pile head reinforcement member 1 is for conveying force exerted on a pile head 2a between a pile 2 and a foundation, and includes: a plate-form material 4 provided in a vertical direction laterally on an outer peripheral surface 2c of the pile head part and embedded in foundation concrete CB that constitutes the foundation; a bar steel 5 inserted inward into the pile head part and fastened to the pile head part through pile concrete CP filled in the pile; a through-hole 11 formed to pierce through the plate-form material in a lateral direction; and a protrusion 12 protruded from a plate surface of the plate-form material, around the through-hole. The plate-form material and the bar steel are provided such that stress may be conveyed therebetween.SELECTED DRAWING: Figure 4

Description

  The present invention can sufficiently ensure the stress transmission action and the fixing force, and can reduce the possibility of interference with the reinforcing bar embedded in the foundation. Further, the present invention relates to a pile head reinforcing member and a pile head reinforcing structure that can improve the construction quality around the pile head by reducing the number of welding steps 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 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.

  In addition, the transmission performance of force and stress in the pile head reinforcement structure is greatly affected by the quality of welding when constructing the structure, so the pile head reinforcement structure itself and the components that make up the structure It is desirable to reduce the number of welded joints as much as possible, and it has also been desired to improve the workability of the pile head reinforcing structure by reducing the number of welding joints.

  The present invention was devised in view of the above-described conventional problems, and it is possible to sufficiently ensure the stress transmission action between the pile and the foundation and the fixing force with respect to the pile head. It is possible to reduce the possibility of interference with the buried reinforcement, and to improve the construction quality around the pile head by reducing the number of welding processes, both as a reinforcement structure and as a component used for it. An object of the present invention is to provide a pile head reinforcing member and a pile head reinforcing structure capable of appropriately securing the structural strength.

  The pile head reinforcing member according to the present invention is a pile head reinforcing member for transmitting a force acting on the pile head between the pile and the foundation, and is vertically oriented on the outer peripheral surface side of the pile head. It is provided and fixed to the pile head via the pile material inserted into the pile head and filled inside the pile head and embedded in the foundation concrete for constructing the foundation. A steel plate, a through-hole penetratingly formed in the plate-like material, and a protrusion projecting from the plate surface around the through-hole to the plate-like material, The steel bar is provided so as to be able to transmit stress to each other.

  The lower end portion of the steel bar is provided with a fixing portion for fixing the steel bar to the pile head via the pile concrete.

  The fixing portion is formed of a fixing plate that extends over the entire circumference in the circumferential direction of the pile, and a plurality of the steel bars are disposed on the fixing plate at appropriate intervals in the circumferential direction of the pile, A plurality of the plate-like materials are arranged along the circumferential direction of the pile.

  The bar steel provided so as to be able to transmit stress to the plate material has a bent portion that is bent outward in the radial direction of the pile head, and the bar steel is the plate material at the bent portion. It is characterized by being welded and joined to.

  In order to bear the compressive force which acts on the said pile head, the mounting board mounted on this pile head upper end surface is provided directly under the said plate-shaped material, It is characterized by the above-mentioned.

  The plate-like material is provided with a transmission piece that is welded to the outer peripheral surface of the pile head and transmits a force acting on the plate-like material to the pile head.

  A pile head reinforcing structure according to the present invention is a pile head reinforcing structure using the above pile head reinforcing member, wherein the steel bar is inserted into the inside of the pile head and the plate-like material is an outer periphery of the pile head. The pile head reinforcing member provided on the side of the plane and installed across the upper end surface of the pile head, and the pile concrete filled in the pile and fixing the steel bar to the pile head, The foundation concrete is placed to construct the foundation, and includes the foundation concrete in which the plate-like material having the through hole and the protruding portion is embedded in the foundation.

  A mounting plate is placed on the upper end surface of the pile head so as to be positioned immediately below the plate-like material of the pile head reinforcing member installed across the pile head.

  The outer peripheral surface of the pile head is provided with the plate-like material, and a transmission piece for transmitting a force acting on the plate-like material to the pile head is welded and joined.

  In the pile head reinforcing member and the pile head reinforcing structure according to the present invention, the stress transmission action between the pile and the foundation and the fixing force to the pile head can be sufficiently secured, and are embedded in the foundation. As well as reducing the possibility of interference with bar arrangements, it is possible to improve the construction quality around the pile head by reducing the number of welding processes, both as a reinforcement structure and as a component used for it. Can be secured appropriately.

It is explanatory drawing explaining 1st Embodiment of the pile head reinforcement member concerning this invention. It is explanatory drawing explaining the component of the pile head reinforcement member shown in FIG. It is explanatory drawing explaining the mode of the assembly of the pile head reinforcement member shown in FIG. It is a side view at the time of using the pile head reinforcement member of FIG. 1 which shows 1st Embodiment of the pile head reinforcement structure concerning this invention. It is explanatory drawing explaining the 1st modification of the pile head reinforcement member shown in FIG. It is explanatory drawing explaining the 2nd modification of the pile head reinforcement member shown in FIG. It is explanatory drawing explaining the various examples of the fixing | fixed part with which the pile head reinforcement member shown in FIG. 1 is equipped. It is a principal part expansion perspective view explaining the other example of the installation aspect of the steel bar which comprises the pile head reinforcement member shown in FIG. It is a principal part expansion perspective view explaining the 3rd modification of the pile head reinforcement member shown in FIG. It is explanatory drawing explaining the other example of the formation aspect of the through-hole and protrusion which comprise the pile head reinforcement member shown in FIG. It is explanatory drawing explaining 2nd Embodiment of the pile head reinforcement member concerning this invention. It is explanatory drawing explaining 3rd Embodiment of the pile head reinforcement member concerning this invention. It is explanatory drawing explaining 4th Embodiment of the pile head reinforcement member concerning this invention. It is a side view of the pile head reinforcement structure at the time of using the pile head reinforcement member of 4th Embodiment shown in FIG. It is explanatory drawing explaining 5th Embodiment of the pile head reinforcement member concerning this invention.

  Hereinafter, preferred embodiments of a pile head reinforcing member and a pile head reinforcing structure according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 4, the pile head reinforcing member 1 according to the present embodiment is provided between the pile 2 and a foundation (not shown) to disperse the compressive force and pull-out force generated in the pile head 2 a. In addition, the force acting on the pile head 2a is transmitted between the pile 2 and the foundation.

  Moreover, the pile head reinforcement structure 3 concerning this embodiment says the structure of the pile head 2a periphery incorporating such a pile head reinforcement member 1. FIG. The pile 2 to be applied has a hollow cylindrical shape and has a steel pipe portion at least in the pile head 2a. Examples thereof include a steel pipe pile (S pile) and a concrete pile with an outer shell steel pipe (SC pile). .

  The hollow concrete of these hollow cylindrical piles 2 is filled with pile concrete CP so as to reach the pile head 2a. A partition plate (not shown) may be installed inside the pile 2. As is well known, the foundation concrete CB is constructed so as to bury the pile head 2a and the foundation reinforcement (not shown) around it, including the footing form. In the following description, for the sake of convenience, the pile concrete CP and the foundation concrete CB are shown separately. Of course, when the foundation concrete CB is placed, the concrete CB is filled in the hollow interior of the pile 2 as it is. The concrete CP may be used, that is, the pile concrete CP and the foundation concrete CB may be the same.

  As shown in FIG. 12, the basic structure of the pile head reinforcing member 1 according to the present invention is mainly composed of a steel plate-like material 4 having a flat plate shape and a steel bar 5 such as a deformed reinforcing bar or a round steel. Is provided so as to be able to transmit stress to each other. The steel bar 5 is configured to be joined to the pile head 2a via the pile concrete CP. Therefore, the steel bar 5 and the pile head 2a are joined without welding. If a deformed bar is adopted as the steel bar 5, the fixing action described later can be sufficiently ensured.

  The configuration in which the plate-like material 4 and the steel bar 5 are provided so as to be able to transmit stress to each other is a method in which they are welded together by main welding, locked by tack welding, or locked together mechanically. Is used.

  As shown in FIG. 4, the basic configuration of the pile head reinforcing structure 3 according to the present invention is an installation mode in which the pile head reinforcing member 1 straddles the upper end surface 2 b of the pile head 2 a of the pile 2, specifically In this case, the steel bar 5 is placed in the hollow interior of the hollow cylindrical pile 2 and the plate-like material 4 is positioned on the side of the outer peripheral surface 2c of the pile 2 (pile head 2a). It exists in the point installed so that it may straddle the said pile 2 outward from the said pile 2 inside with respect to a part.

  FIG. 1 is an explanatory view for explaining a first embodiment of a pile head reinforcing member 1 according to the present invention. FIG. 1 (A) is a plan view, FIG. 1 (B) is a side view, and FIG. It is explanatory drawing explaining the component of the pile head reinforcement member 1 shown in FIG. 1, Comprising: FIG. 2 (A) is a figure which shows one planar view and side view of a pair of plate-shaped piece 6, FIG. ) Is a diagram showing a plan view and a side view of the accessory plate 7 provided on the one plate-like piece 6, and FIG. 2C is a diagram showing the other plan view and a side view of the pair of plate-like pieces 6. 2 (D) is a diagram showing a plan view and a side view of the accessory plate 7 provided on the other plate-like piece 6, FIG. 2 (E) is a side view showing the bar 5, and FIG. 2 (F). FIG. 3 is a diagram showing a plan view and a side view of the fixing plate 8a, FIG. 3 is an explanatory diagram for explaining the assembly of the pile head reinforcing member 1 shown in FIG. 1, and FIG. The figure which shows the planar view and side view of the stage which joined the plate 7 of FIG. 2 (B) to the plate-shaped piece 6 of (A), FIG.3 (B) is the plate-shaped piece 6 of FIG.2 (C). 2D is a view showing a plan view and a side view of the stage where the splicing plate 7 of FIG. 2D is joined. FIG. 3C is a plan view of the plate-like piece 6 with the spitting plate 7 of FIG. The figure which shows the planar view and side view of the step which assembled | attached the plate-shaped piece 6 with the attaching plate 7 of B), FIG. 4 shows 1st Embodiment of the pile head reinforcement structure 3 concerning this invention, FIG. It is a side view at the time of using the pile head reinforcement member 1. FIG.

  The pile head reinforcing member 1 according to the first embodiment is mainly composed of a pair of two plate-like pieces 6 having a lateral length dimension that crosses at least the pile head 2a and protrudes to both sides thereof, and a plate-like piece. 6 comprising 8 steel bars 5 provided on the front and back surfaces of the steel plate 6, 8 attachment plates 7 welded to the front and back surfaces of the plate-like piece 6, and one annular fixing plate 8 a provided on the steel bar 5. Is done.

  The plate-like piece 6 is directed to the direction in which the plate surface stands on the pile head 2a. The plate-like piece 6 is obtained by integrating a plurality of plate-like materials 4 extending in the radial direction from the center of the pile head 2a at the center of the pile head 2a. In the illustrated example, the plate-like pieces 2 are arranged in the diameter direction 2. The case where the sheet-like material 4 is integrally formed on one plate is shown. In other words, the plate-like piece 6 corresponds to the two plate-like members 4 arranged in the diameter direction of the pile head 2a joined at the center of the pile head 2a.

  In the illustrated example, two plate-like pieces 6 are each formed with an upward groove 9 and a downward groove 10 formed at the center in the length direction (the center of the pile head 2a). By being fitted together, the plate-like pieces 6 are assembled so as to form a cross shape on the pile head 2a.

  Each of the two plate-like members 4 formed on one plate-like piece 6 includes a joint 4a that is positioned on the pile head 2a so that the steel bar 5 can transmit stress, and a pile head from the joint 4a. The portion 2a is pushed outward, and is hung downward in the height direction of the pile 2 from the lower edge of the joint 4a on the side of the outer peripheral surface 2c of the pile head 2a, and thereby lower than the joint 4a. And a projecting portion 4b which is formed in a wide direction and is provided vertically on the side of the outer peripheral surface 2c of the pile head 2a.

  The plate-like material 4 and eventually the plate-like piece 6 are provided on the pile head 2a by placing the lower edge of the joint 4a directly on the pile head 2a. The plate-like material 4 may be simply placed and installed on the pile head 2a, may be locked by tack welding, or may be welded and joined by main welding.

  The protruding portion 4b is formed with a through hole 11 through which the plate-like material 4 is penetrated sideways and the basic concrete CB is circulated on both the front and back surfaces of the plate-like material 4. Although the through hole 11 is single in the illustrated example, a plurality of through holes 11 may be formed at an appropriate interval.

  Further, the protruding portion 4b is provided with a protruding portion 12 that protrudes from the plate surface of the plate-like material 4 around the through hole 11 in order to secure the fixing property to the foundation concrete CB. The protrusion 12 is integrally formed with the plate-like material 4 by a known burring process. In the relationship between the plurality of plate-like members 4, the protruding direction of the protruding portion 12 from the plate surface may or may not be the same direction around the outer peripheral surface 2 c of the pile 2.

  The height position at which the through hole 11 is formed with respect to the height position of the upper end surface 2b of the pile head 2a is a position at which the through hole 11 is applied to the upper end surface 2b of the pile head 2a or below. Any height position may be used.

  That is, when the height position of the through hole 11 is set to be the highest, the lower edge of the through hole 11 and the upper end surface 2b of the pile head 2a are flush with each other. The upper edge of the through hole 11 is located below the upper end surface 2b of the pile head 2a. As a result, the entire through hole 11 is on the outer peripheral surface 2c side of the pile head 2a below the upper end surface 2b of the pile head 2a. It is positioned in the direction.

  As a result, the protruding height of the plate-like material 4 from the upper end surface 2b of the pile head 2a of the plate-like piece 6 oriented toward the direction in which the plate surface stands on the pile head 2a is the position where the through hole 11 is the most. It is high when positioned high, and low when positioned low.

  In the present embodiment, the reinforcing plate 7 is welded to the front and rear surfaces of the joint 4 a of the plate-like material 4. In the illustrated example, a case where two plate-like members 4 are integrated by one plate-like piece 6 is shown, and one plate 7 is provided on each of the front and back surfaces of this plate-like piece 6. ing.

  Since the two plate-like pieces 6 are assembled in a cross shape, the accessory plate 7 has the same upward groove 9 and downward groove 10 that are matched with the upward groove 9 and the downward groove 10 of these plate-like pieces 6. Is formed. And after making these groove | channels 9 and 10 correspond, the plate 7 is welded and joined to the plate-shaped piece 6. FIG.

  Two attachment plates 7 may be provided on each of the front and back surfaces of the plate-like piece 6 so as to be individually attached to the joint portion 4 a of each plate-like material 4. In this case, it is not necessary to form the upward groove 9 and the downward groove 10 in the accessory plate 7. In other words, in the illustrated example, one splicing plate 7 is configured as a series of splicing plates 7 for the two plate-like materials 4. The accessory plate 7 is provided so as to overlap the plate-like material 4 from almost the entire area of the joining portion 4a of the plate-like material 4 to the vicinity of the protruding portion 12 of the protruding portion 4b.

  The plate-like material 4 having the through hole 11 and the protruding portion 12 is embedded in the foundation concrete CB that constructs the foundation.

  A steel bar 5 is welded and joined to the joint 4a of the plate-like material 4 via a splicing plate 7 so that stress can be transmitted. In the illustrated example, the plate-like material 4 and the plate 7 are provided on both the front and back surfaces of the plate-like piece 6, and a pair of steel bars 5 are provided on the front and back of each plate-like material 4. In the illustrated example, since a pair of plate-like pieces 6 each including two plate-like materials 4 are provided, eight steel bars 5 are provided.

  Only one steel bar 5 may be provided on either the front or back of the plate-like material 4. In this case, four steel bars 5 are provided. Alternatively, three or more steel bars 5 may be provided for each plate-like material 4.

  The steel bar 5 is inserted from the joint 4a located on the pile head 2a toward the inside of the pile head 2a. The steel bar 5 is fixed to the pile head 2a by the pile concrete CP filled inside the pile head 2a. In this embodiment, the steel bar 5 includes a straight bar portion 5a inserted inward of the pile head portion 2a, and a substantially right angle in a lateral direction from the upper end of the straight rod portion 5a toward the radially outer side of the pile head portion 2a. The steel bar 5 is welded and joined to the joint 4a of the plate-like material 4 via the splicing plate 7 at the laterally bent portion 5b.

  In this way, by joining at the laterally bent portion 5b, compared to the case where the steel bar 5 is in the form of a straight bar without the bent portion 5b, the same weld length can be secured from the upper end surface 2b of the pile head 2a. The protruding height of the plate-like material 4 is kept low. That is, if the steel bar 5 is joined at the bent portion 5b, sufficient welding joint strength is ensured while suppressing the installation height of the pile head reinforcing member 1 on the pile head 2a. In addition, the plate thickness of the plate-like material 4 and the accessory plate 7 can be reduced.

  What is necessary is just to set suitably the length which fixes the straight bar part 5a of the steel bar 5 to the pile head part 2a so that required fixing strength may be obtained. The bent portion 5b of the steel bar 5 is used to stiffen the plate-like material 4 between the pile head 2a and the foundation, and is also good for the protrusion 12 of the plate-like material 4 and the foundation concrete CB. The length is set so as to reach the position of the outer peripheral surface 2c of the pile head 2a or a position near the protruding portion 12 slightly outside thereof so as not to hinder the joining.

  The steel bar 5 is provided with a fixing portion 8 for fixing it to the pile head 2a through the pile concrete CP. The fixing part 8 is individually bent to the straight bar part 5a of each steel bar 5 inserted into the pile head part 2a, and the lower end part thereof is bent into a J shape or an L shape, or the lower end part is formed into a bump shape. However, in this embodiment, the fixing unit 8 is exemplified by a single fixing plate 8a having an annular shape extending over the entire circumference in the circumferential direction of the pile 2. The plate 8 a is provided by connecting the lower ends of a plurality of steel bars 5 in series along the circumferential direction of the pile 2.

  The fixing unit 8 may be configured by providing individual fixing pieces 8b for each steel bar 5 instead of the fixing plate 8a, or a pair of two steel bars provided on the front and back of one plate-like material 4 The fixing piece 8c may be configured to connect the five members (see FIG. 7). Further, the fixing plate 8a is not limited to an annular shape, and may be in any shape as long as it extends over the entire circumference in the circumferential direction of the pile 2, such as a disk shape. By providing such a fixing portion 8, the insertion length of the steel bar 5 into the pile head 2 a inward, that is, the length of the straight rod portion 5 a can be shortened, and weight reduction and cost reduction can be ensured. And the amount of pile concrete CP can be reduced.

  The fixing plate 8a is formed with an outer dimension that can be inserted into the pile head 2a. The fixing plate 8a and the lower end of the steel bar 5 may be joined by welding, or the steel bar 5 inserted through the through hole 13 formed in the fixing plate 8a is fastened to the fixing plate 8a via a nut (not shown). You may make it do.

  As a result, a plurality of steel bars 5 are arranged on the fixing plate 8 a at appropriate intervals in the circumferential direction of the pile 2. As a result, the plurality of plate-like members 4 are connected to the pile 2 via the steel bars 5. Are arranged along the circumferential direction.

  The pile head reinforcing member 1 shown in FIG. 1 is assembled, for example, as shown in FIG. 3, by attaching the attachment plate 7 to the front and back surfaces of each plate-like piece 6 having the upward groove 9 and the downward groove 10, While the plate-like pieces 6 are assembled in a cross shape by fitting the grooves 9 and 10 together, although not shown, the bar 5 is joined to the fixing plate 8a, and then each bent portion 5b of each bar 5 is attached to the attachment plate 7 The pile head reinforcing member 1 shown in FIG. 1 and FIG. 4 is completed by joining to the front and back of the plate-like piece 6, that is, the front and back of each plate-like material 4.

  The pile head reinforcing structure 3 using the pile head reinforcing member 1 according to the first embodiment will be described. As shown in FIG. 4, the pile head reinforcing member 1 is made of a steel bar 5 having a fixing plate 8a provided at the lower end portion. By simply inserting the straight rod portion 5a into the pile head 2a, the lower edge of the plate-like piece 6, that is, the joint portion 4a of the plate-like material 4, is placed on the upper end surface 2b of the pile head 2a. The protruding portion 4b having the hole 10 and the protruding portion 11 is positioned in the vertical direction on the side of the outer peripheral surface 2c of the pile head 2a.

  The pile head reinforcing member 1 may simply be placed on the pile head 2a. Of course, the lower edge of the joint 4a of the pile head reinforcing member 1 may be tack welded and locked to the upper end surface 2b of the pile head 2a, or may be main welded. It is only necessary that the pile head reinforcing member 1 can be placed on the pile head 2a.

  Then, pile concrete CP is filled in the pile head 2a. Thereby, the steel bar 5 of the pile head reinforcing member 1 including the fixing plate 8a is fixed to the pile head 2a via the pile concrete CP, and the pile head reinforcing member 1 is firmly bonded and fixed to the pile head 2a. . Then, the plate-like material 4 of the pile head 2a and the pile head reinforcing member 1 is embedded in the foundation concrete CB together with the basic reinforcement arranged around the pile head 2a. The pile concrete CP may be poured into the pile head 2a and filled when the foundation concrete CB is placed.

  At this time, the foundation concrete CB goes around the front and back of the plate-like material 4 through the through-holes 11 and, at the same time, adheres to the protrusions 12, and the pile head reinforcing member 1 is firmly integrated with the foundation. . Then, by filling the pile concrete CP and placing the concrete foundation CB, the bending moment, shearing force and axial force acting on the pile head 2a are transmitted between the foundation and the pile 2 by the pile head reinforcing member 1. . Although not shown, before placing the foundation concrete CB, a foundation reinforcing bar arranged around the pile head 2a or a separately prepared reinforcing reinforcing bar is inserted into the through hole 11 in advance. This may further improve the bending strength and shear strength against the bending moment and shearing force acting on the pile head 2a.

  The pile head reinforcing member 1 according to the first embodiment is provided in the vertical direction on the side of the outer peripheral surface 2c of the pile head 2a, and a plate-like material 4 for embedding in the foundation concrete CB for constructing the foundation, A steel bar 5 for fixing to the pile head 2a via a pile concrete CP inserted inside the head 2a and filled inside the pile 2, and a through hole 11 formed penetrating horizontally in the plate-like material 4 And a protrusion 12 projecting from the plate surface around the through-hole 11 on the plate-like material 4, the plate-like material 4 and the steel bar 5 are provided so as to be able to transmit stress to each other, and In the pile head reinforcing structure 3 according to the first embodiment, the steel bar 5 is inserted inward of the pile head 2a, and the plate-like material 4 is provided on the side of the outer peripheral surface 2c of the pile head 2a. The pile head reinforcing member 1 installed across the upper end surface 2b of the steel plate and the inside of the pile 2 are filled to fix the steel bar 5 to the pile head 2a. Pile concrete CP and foundation concrete CB which is placed to construct a foundation and embeds a plate-like material 4 having a through-hole 11 and a projecting portion 12 in the foundation. Unlikely, the steel bar 5 can sufficiently secure the fixing property to the pile head 2a, and at the same time, the through-hole 11 and the protrusion 12 provided in the plate-like material 4 of the pile head reinforcing member 1 can improve the fluidity of the foundation concrete CB. Adhesiveness can be ensured and the joint strength to the foundation concrete CB can be improved, so that the stress transmission action between the pile 2 and the foundation can be obtained appropriately and sufficiently.

  Moreover, since the vertical protruding portion 4b having the through hole 11 and the like is provided on the side of the outer peripheral surface 2c of the pile head 2a, the amount of protrusion of the pile head reinforcing member 1 to the upper side of the pile head 2a is suppressed. The pile head reinforcement member 1 can be prevented from interfering with the foundation reinforcement embedded in the foundation, and the plate-like material 4 can be reduced in weight, reduced in cost, improved in handleability, etc. In the construction of 2 and foundation, various excellent effects can be achieved.

  Moreover, the pile head reinforcement member 1 should just weld-join at least the bending part 5b of the steel bar 5 to the junction part 4a of the plate-shaped material 4, and the welding joint can be performed by downward welding in a factory or the field. In addition, it is possible to ensure excellent welding quality with a short welding length, and therefore the construction quality of the pile head reinforcement structure 3 constructed using the pile head reinforcement member 1 can be improved.

  When a vertical force acts on the projecting portion 12 of the plate-like material 4, bending and shearing acts greatly on the boundary between the protruding portion 4b and the joint portion 4a and its periphery, but the bent portion 5b of the steel bar 5 is used as the pile head. Since it has joined so that it may reach to the outer peripheral surface 2c periphery of 2a, the said boundary periphery can be stiffened efficiently and the structural strength of the pile head reinforcement member 1 can be improved appropriately.

  With regard to the joining of the fixing plate 8a and the steel bar 5, it is not necessary to use welding according to screw joining such as nuts, and even if welding is used, since it is assembled at the factory or at the site, higher joining quality can be ensured, Therefore, even if one fixing plate 8a is used, the quality of the pile head reinforcing member 1 and the pile head reinforcing structure 3 can be ensured high.

  Furthermore, also about the installation to the pile head 2a of the pile head reinforcement member 1, the installation work can be completed only by mounting the joint 4a lower edge of the plate-like material 4 on the upper end surface 2b of the pile head 2a. After the installation is completed, the pile concrete CP can be filled to complete the connection to the pile head 2a, so that the installation of the pile head reinforcement member 1 can be made non-welded. In addition to ensuring adequate structural strength, it is also possible to save labor in construction.

  From the viewpoint of stabilizing the installation state of the pile head reinforcing member 1 on the pile head 2a, tack welding or main welding may be performed, but even in this case, the pile head 2a The lower edge of the plate-like material 4 can be joined on the upper end surface 2b by downward welding, and joining can be easily performed with high welding quality.

  Since the protrusions 12 are formed so as to surround the through-holes 11 from their surroundings, these protrusions 12 and the through-holes 11 can be reasonably and efficiently compared to the case where the protrusions 12 and the through-holes 11 are separately formed. Both can be provided, and even in a narrow space, a large number of these can be provided, and the foundation concrete CB that flows with good fillability through the through-holes 11 is smoothly fed around the protrusions 12, A close adhesion between the two can be ensured.

  Since a plurality of the plate-like members 4 of the pile head reinforcing member 1 are arranged around the pile head 2a at intervals, the plurality of plate-like members 4 ensure a wide fixing area, The stress transmission action between the piles 2 can be ensured accurately and sufficiently.

  Since two pairs of steel bars 5 are provided in parallel on the front and back of each plate-like material 4, even if a force acts on the steel bar 5, deformation of the plate-like material 4 due to twisting can be suppressed.

  As explained above, in the pile head reinforcing member 1 and the pile head reinforcing structure 3 according to the first embodiment, both the pile head reinforcing member 1 and the pile head reinforcing structure 3 have a stress transmission action and fixation. Pile head can be secured by reducing the number of welding man-hours, both as a reinforcing structure and as a component used for it, as well as ensuring sufficient force and reducing the possibility of interference with reinforcements embedded in the foundation. The construction quality around 2a can be improved, and the structural strength can be ensured appropriately.

  Since the steel bar 5 is provided with the fixing portion 8 for fixing to the pile head 2a with the pile concrete CP, higher fixing performance can be secured.

  Further, when a bending moment is generated in the pile head 2a, one of the pile head reinforcing members 1 arranged around the pile head 2a receives the pulling force, and at the same time the other The pile head reinforcing member 1 on the side receives a compressive force. At this time, as shown in FIG. 4, the plate-like material 4 and the steel bar 5 of the pile head reinforcing member 1 on the side receiving the compressive force, and the fixing portion 8 of the steel bar 5 of the pile head reinforcing member 1 on the side receiving the pulling force In the meantime, the compression strut F is generated, and thereby, it is possible to ensure the stress transmission for dispersing the compression force, and to improve the structural soundness of the pile head 2a.

  The fixing portion 8 is formed of a fixing plate 8a that extends in the circumferential direction of the pile 2, and a plurality of steel bars 5 are arranged on the fixing plate 8a at appropriate intervals in the circumferential direction of the pile 2. Since a plurality of plate-like members 4 are arranged along the circumferential direction of the pile 2, the pile head reinforcing member 1 made of the steel bar 5 and the plate-like member 4 is used by using the fixing plate 8a that enhances the fixing action. Since a plurality of units can be formed, the installation stability to the pile head 2a is higher than the case where each pile head reinforcement member 1 is individually placed on the pile head 2a and installed, and the plurality of pile head reinforcement members Since 1 can be installed collectively, construction efficiency can be remarkably improved.

  The steel bar 5 provided so as to be able to transmit stress to the plate-like material 4 has a bent part 5b bent outward in the radial direction of the pile head 2a, and the steel bar 5 is a plate-like material at the bent part 5b. 4, the height of the protrusion from the pile head 2 a of the plate-like material 4, and thus the pile head reinforcing member 1, is lower than when the steel bar 5 is in the form of a straight bar without the bent portion 5 b. Therefore, the possibility of interference with the basic reinforcement is reduced, and the workability can be improved.

  Since the steel bar 5 is joined to the plate-like material 4 via the accessory plate 7, the strength of the joint portion 4a can be efficiently enhanced while keeping the plate thickness thin. Since the steel bars 5 are joined to the front and back surfaces of the plate-like material 4, the strength of the pile head reinforcing member 1 itself can be increased. The steel bar 5 may be provided only on either the front or back surface of the plate-like material 4. The attachment plate 7 may be provided only on either the front or back surface of the plate-like material 4. When the steel bar 5 is provided on one side of the plate-like material 4, the attachment plate 7 is provided on the one surface on which the steel bar 5 is installed. You may make it provide only.

  FIG. 5 shows a first modification of the pile head reinforcing member 1 shown in FIG. FIG. 5A is a plan view of the first modification, and FIG. 5B is a side view thereof.

  The first modification is a case where the fixing plate 8a as the fixing unit 8 is not used. Needless to say, the fixing portion 8 is not necessarily provided, and it is a matter of course that the sticking / fixing property of the pile head 2a to the pile concrete CP can be secured by the steel bar 5 itself such as a deformed reinforcing bar. Other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be achieved even with the pile head reinforcing member 1 according to the first modification and the pile head reinforcing structure 3 using the same. Play.

  FIG. 6 shows a second modification of the pile head reinforcing member 1 shown in FIG. FIG. 6 is a side view of the second modification. The second modified example is different from the first embodiment in that the placement is placed on the upper end surface 2b of the pile head 2a in order to bear the compressive force acting on the pile head 2a immediately below the plate-like material 4. The board 14 is provided.

  The mounting plate 14 is formed in a ring shape that is placed along the circumferential direction on the upper end surface 2b of the pile head 2a so as not to hinder the filling of the pile concrete CP into the inside of the pile head 2a. The mounting plate 14 has an outer edge 14a positioned on the outer side of the pile head 2a and an outer periphery of the pile head 2a with respect to the outer side of the pile head 2a and the inner side of the pile head 2a along the radial direction of the pile head 2a. The inner edge 14b, which is set so as to coincide with the surface 2c or project outward, is located on the inner side of the pile head 2a, projects inward from the thickness of the pile head 2a, that is, the pile head 2a is set so as to overhang the pile concrete CP filled inward.

  In 1st Embodiment, although it was the structure where the plate-shaped material 4 lower edge of the pile head reinforcement member 1 was mounted directly on the upper end surface 2b of the pile head 2a, in the 2nd modification, these pile heads 2a A mounting plate 14 is provided so as to be sandwiched between the upper end surface 2b and the lower edge of the plate-like material 4.

  The mounting plate 14 is also installed without welding by simply placing it on the upper end surface 2b of the pile head 2a. You may temporarily fix to the pile head 2a by tack welding.

  On the other hand, the mounting plate 14 may be tack-welded or main-welded to the joint 4a of the pile head reinforcing member 1 in advance at a factory or site. If it does in this way, while the pile head reinforcement member 1 which integrated the mounting board 14 can be comprised, construction can be labor-saving, and the welding operation also becomes downward welding, and pile with high welding quality The head reinforcing member 1 can be configured, and accordingly, the construction quality of the pile head reinforcing structure 3 can be ensured high.

  Moreover, the mounting board 14 is formed in the several piece piece which divided | segmented the ring shape, without forming in the ring shape covering the perimeter of the upper end surface 2b of the pile head part 2a, and each plate-like material 4 is individual. You may make it provide in.

  By simply placing the mounting plate 14 on the upper end surface 2b of the pile head 2a, when the compression strut F is generated, the mounting plate 14 can more structurally press the pile concrete CP and compress the compression force. It is possible to reliably ensure stress transmission that disperses the pile, and to further increase the structural strength of the pile head 2a. Further, when a compressive force toward the pile head 2a is applied to the pile head reinforcing member 1, the mounting plate 14 serves as a cover, and local deformation that may occur on the upper end surface 2b of the pile head 2a can be suppressed.

  Other configurations are the same as those in the first embodiment, and the same effects as in the first embodiment can be achieved even in the pile head reinforcing member 1 according to the second modification and the pile head reinforcing structure 3 using the same. Play.

  FIG. 7 shows various examples of the fixing portion 8 provided in the pile head reinforcing member 1 shown in FIG. In place of the fixing plate 8a, FIG. 7A shows a plate-like fixing provided for each set of a pair of two steel bars 5 joined to the front and back of one plate-like material 4 as a set. FIG. 7B is a bottom view showing the plate-like fixing pieces 8b provided on each of the steel bars 5 and the arrangement thereof.

  As described above, the fixing portion 8 may be provided on the steel bar 5 in any manner as long as the fixing action can be secured in addition to the fixing plate 8a that can handle the steel bars 5 collectively as in the first embodiment. Of course. Other configurations are the same as those in the first embodiment, and the pile head reinforcing member 1 including the fixing portion 8 and the pile head reinforcing structure 3 using the same are the same as those in the first embodiment. Has an effect.

  FIG. 8 is an enlarged perspective view of a main part for explaining another example of an installation mode of the steel bar 5 constituting the pile head reinforcing member 1 shown in FIG. The steel bar 5 is formed in a downward U-shape having a folded portion 5c that bridges the joint 4a of the plate-like material 4 from above. The steel bar 5 is provided so as to transmit stress to the plate-like material 4 without welding.

  That is, when a force that relatively displaces the pile head portion 2a and the foundation in the vertical direction is applied, when the plate-like material 4 moves upward by the foundation, stress is transmitted by the folded portion 5c of the steel bar 5. Moreover, when the steel bar 5 moves downward by the pile 2, stress transmission can be performed by the plate-like material 4.

  The steel bar 5 may be provided on the plate-like material 4 not by welding but by tack welding or main welding. The other configuration is the same as that of the first embodiment, and is a pile head reinforcing member 1 having such a form of joining the steel bar 5 and the plate-like material 4 and a pile head reinforcing structure 3 using the same. The same effects as the first embodiment can be obtained.

  FIG. 9 is an enlarged perspective view of a main part for explaining a third modification of the pile head reinforcing member 1 shown in FIG. In the third modified example, the plate-like material 4 is provided with a transmission piece 15 for transmitting the force acting on the plate-like material 4 by being welded to the outer peripheral surface 2c of the pile head 2a to the pile head 2a.

  The transmission piece 15 is in the form of a band along the outer peripheral surface 2c of the pile head 2a, and the pile head 2a along the arcuate portion 15a welded to the outer peripheral surface 2c and the protruding portion 4b of the plate-like material 4. And projecting part 15b formed from the arcuate part 15a and supporting the projecting part 4b from below. The convex part 15b does not need to be formed. The protruding portion 4b is welded to the upper edge of the arcuate portion 15a and the upper surface of the convex portion 15b by welding downward.

  When forming the convex part 15b in the arcuate part 15a, the protruding length that does not reach the protruding part 12 in the radial direction of the pile head 2a, so as not to hinder the action of the through hole 11 and the protruding part 12; Moreover, in the circumferential direction of the pile head 2a, it is preferable to set a narrow width that does not exceed the protruding amount of the protruding portion 12 from the plate-like material 4 on the basis of the plate surface of the plate-like material 4.

  The transmission piece 15 itself performs a stress transmission effect with the foundation, and further, when a vertical force is applied to the protruding portion 4b, the transmission piece 15 also transmits the force to the pile head 2a. And the intensity | strength of the protrusion part 4b located in the outer peripheral surface 2c side of the pile head part 2a and the outer peripheral surface 2c periphery of the pile head part 2a can be strengthened. The arcuate portion 15a may be formed in an annular shape around the pile head 2a so as to connect the plurality of pile head reinforcing members 1.

  Other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be achieved even with the pile head reinforcing member 1 according to the third modification and the pile head reinforcing structure 3 using the same. Play.

  FIG. 10 is an explanatory view for explaining another example of the formation form of the through hole 11 and the protrusion 12 constituting the pile head reinforcing member 1 shown in FIG. FIG. 10A is a plan sectional view in the case where the metal thin plate material 16 is provided so as to be superimposed on the protruding portion 4b, and FIG. 10B is a metal ring body 17 provided so as to be overlapped on the protruding portion 4b. FIG.

  In 1st Embodiment, the through-hole 11 and the protrusion part 12 were integrally molded by giving the burring process to the plate-shaped material 4. As shown in FIG. However, when the plate-like material 4 is thick, it becomes extremely difficult. In such a case, it is rational that only the through hole 11 is formed in the plate-like material 4 and the protruding portion 12 is constituted by another member.

  In FIG. 10A, the thin plate material 16 is superposed on the plate-like material 4 and bonded and fixed by various bonding methods such as adhesion, and the thin plate material 16 is subjected to burring so as to form the protruding portion 12. I have to. In FIG. 10B, the ring body 17 is overlaid on the plate-like material 4, and is fixed by various joining methods such as welding as in the case of the thin plate material 16. The part 12 is configured.

  Even if it does in this way, of course, the effect similar to the through-hole 11 and the protrusion part 12 of 1st Embodiment can be ensured. In particular, in the embodiment of the first embodiment, the protrusion 12 can be formed only on either the front or back side of the plate-like material 4, but in the example of FIG. 10 using another member, the thin plate material 16 or the ring body 17. Is provided on the front and back of the plate-like material 4, so that there is an advantage that the protruding portions 12 can be formed on both the front and back.

  Other configurations are the same as those of the first embodiment, and the pile head reinforcing member 1 including the through hole 11 and the protruding portion 12 having such a form and the pile head reinforcing structure 3 using the same are also provided. The same operation effect as 1 embodiment is produced.

  Drawing 11 is an explanatory view explaining a 2nd embodiment of pile head reinforcement member 1 concerning the present invention. FIG. 11A is a plan view of the second embodiment, and FIG. 11B is a side view thereof. The second embodiment corresponds to the basic configuration of the present invention. In the first embodiment, the two plate-like materials 4 arranged in the diameter direction of the pile head 2a are integrated with one plate-like piece 6, but in the second embodiment, one plate is used. The shaped material 4 is provided with one, two or more steel bars 5 so as to transmit stress.

  Unlike the first embodiment, in the second embodiment, the upper end surface 2b of the pile head 2a is made up of the individual plate-like materials 4 and the steel bars 5 provided in them without integrating the plurality of plate-like materials 4. Therefore, the pile head reinforcing member 1 is arranged in the circumferential direction of the pile 2 as compared with the first embodiment in which the pile head reinforcing member 1 is provided in the four directions from the center of the pile head 2a. The required number of the pile head reinforcement structures 3 can be ensured accurately.

  In the second embodiment, since a plurality of steel bars 5 of a plurality of plate-like members 4 are sequentially connected in the circumferential direction of the pile 2 by a single fixing plate 8a, it can be handled as a single unit. Labor saving can be achieved. The other structure is the same as that of the said 1st Embodiment, Comprising: Even if it is the pile head reinforcement member 1 of 2nd Embodiment and the pile head reinforcement structure 3 using the same, the effect similar to 1st Embodiment is obtained. Play.

  Drawing 12 is an explanatory view explaining a 3rd embodiment of pile head reinforcement member 1 concerning the present invention. FIG. 12A is a plan view of the third embodiment, and FIG. 12B is a side view thereof. Compared to the second embodiment, the third embodiment is a plate-like fixing piece 8c described above in the case where a pair of two steel bars 5 of each plate-like material 4 is set as the fixing unit 8 (FIG. 7A). Reference) is used.

  By comprising in this way, the pile head reinforcement member 1 of the basic composition provided with the plate-shaped material 4 and the steel bar 5 can be freely arrange | positioned to the pile head 2a. The other structure is the same as that of the said 1st Embodiment, Comprising: Even if it is the pile head reinforcement member 1 of 3rd Embodiment and the pile head reinforcement structure 3 using the same, the effect similar to 1st Embodiment is obtained. Play.

  FIG. 13 is an explanatory view for explaining a fourth embodiment of the pile head reinforcing member 1 according to the present invention, FIG. 13 (A) is a plan view thereof, and FIG. 13 (B) is a side view thereof. 14 is a side view of the pile head reinforcing structure 3 when the pile head reinforcing member 1 of the fourth embodiment shown in FIG. 13 is used. The pile head reinforcing member 1 of the fourth embodiment shown in FIG. 13 is a case where the attachment plate 7 is omitted from the first embodiment, and specifically, the pile head reinforcing member 1 of FIG. This is a case where the plate 7 according to the second modification is not provided.

  The accessory plate 7 reinforces the joining between the steel bar 5 and the joint portion 4a of the plate-like material 4 and reinforces the plate-like material 4 by increasing its thickness. It may be omitted, and may be omitted if the strength is satisfactory. Thereby, labor for assembling the pile head reinforcing member 1 can be saved. The other structure is the same as that of the said 1st Embodiment, Comprising: Even if it is the pile head reinforcement member 1 of 4th Embodiment and the pile head reinforcement structure 3 using the same, the effect similar to 1st Embodiment is obtained. Play.

  15A and 15B are explanatory views for explaining a fifth embodiment of the pile head reinforcing member 1 according to the present invention, in which FIG. 15A is a plan view and FIG. 15B is a side view thereof. In the fifth embodiment, in contrast to the first embodiment, the spigot plate 7 is omitted, one steel bar 5 is provided on either the front or back of each plate-like material 4, and each steel bar is used as the fixing unit 8. A plate-shaped fixing piece 8b is individually provided for each of the five. The fixing piece 8b may not be provided.

  5th Embodiment is the pile head reinforcement member 1 provided with the required minimum structure, using the plate-shaped piece 6 of 1st Embodiment, Comprising: The pile head reinforcement member 1 of such 5th Embodiment and Even if it is the pile head reinforcement structure 3 using it, there exists an effect similar to 1st Embodiment.

DESCRIPTION OF SYMBOLS 1 Pile head reinforcement member 2 Pile 2a Pile head 2b Pile head upper end surface 2c Pile head outer peripheral surface 3 Pile head reinforcement structure 4 Plate material 5 Steel bar 5b Bar steel bending part 8 Fixing part 8a Fixing plate 11 Through hole 12 Protruding part 14 Mounting plate 15 Transmission piece CB Foundation concrete CP Pile concrete

Claims (9)

A pile head reinforcing member for transmitting the force acting on the pile head between the pile and the foundation,
It is provided vertically on the outer peripheral surface side of the pile head, and is inserted into the pile head inward and filled in the pile inward in the foundation concrete for constructing the foundation. Steel bar for fixing to the pile head through the pile concrete to be formed, a through hole formed in the plate-like material penetrating laterally, and projecting from the plate surface around the through-hole to the plate-like material A pile head reinforcing member comprising: a projected portion, wherein the plate-like material and the steel bar are provided so as to transmit stress to each other.   The pile head reinforcing member according to claim 1, wherein a fixing portion for fixing the steel bar to the pile head via the pile concrete is provided at a lower end portion of the steel bar.   The fixing portion is formed of a fixing plate that extends over the entire circumference in the circumferential direction of the pile, and a plurality of the steel bars are disposed on the fixing plate at appropriate intervals in the circumferential direction of the pile, The pile head reinforcing member according to claim 2, wherein a plurality of the plate-like members are arranged along the circumferential direction of the pile.   The bar steel provided so as to be able to transmit stress to the plate material has a bent portion that is bent outward in the radial direction of the pile head, and the bar steel is the plate material at the bent portion. The pile head reinforcing member according to any one of claims 1 to 3, wherein the pile head reinforcing member is welded to the pile head.   The mounting plate placed on the upper end surface of the pile head is provided immediately below the plate-like material, in order to bear a compressive force acting on the pile head. A pile head reinforcing member according to any one of the above.   The plate-like material is provided with a transmission piece that is welded to the outer peripheral surface of the pile head and transmits a force acting on the plate-like material to the pile head. The pile head reinforcement member of any one of claim | item 1 -5. A pile head reinforcing structure using the pile head reinforcing member according to any one of claims 1 to 4,
The pile head reinforcing member, wherein the steel bar is inserted inside the pile head and the plate-like material is provided on the outer peripheral surface side of the pile head, and is installed across the upper end surface of the pile head. The pile concrete filled in the pile to fix the steel bar to the pile head, and the plate-like material provided to construct the foundation and having the through hole and the protrusion. A pile head reinforcing structure comprising the foundation concrete embedded in a foundation.   The mounting plate is placed on the upper end surface of the pile head so as to be positioned directly below the plate-like material of the pile head reinforcing member installed across the pile head. 7. Pile head reinforcement structure according to 7.   The outer peripheral surface of the pile head is provided with the plate-like material, and a transmission piece for transmitting a force acting on the plate-like material to the pile head is welded and joined. Item 9. The pile head reinforcement structure according to Item 7 or 8.

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