JP4578029B2 - Pile head structure and pile head bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a pile such as a concrete pile with a shell steel pipe or a cast-in-place steel pipe concrete pile having a steel pipe portion fixed to the foundation concrete via a deformed reinforcing bar, and a head of the pile. It is related with metal fittings, such as a pile for attaching a deformed reinforcing bar to a part.
[0002]
[Prior art]
When constructing the foundation, a pile buried in the ground and the foundation concrete are integrated through a reinforcing bar. In particular, in order to improve the adherence of concrete, it is common to use deformed reinforcing bars in which the outer peripheral surface is formed with nodes composed of protrusions in the longitudinal direction and the circumferential direction. The deformed reinforcing bar is attached to the head of the pile after the pile is buried at a predetermined position on the site. For this reason, it is necessary for the attachment structure of the deformed reinforcing bar to the pile head to be simple and ensure the accuracy, and many techniques have been proposed to realize such a structure.
[0003]
For example, the technique disclosed in Japanese Patent Publication No. 3-54736 (first known example) relates to “pile with a reinforcing bar connector”, and attaches a connector to the outer periphery of the head of the pile, A screw hole for screwing a reinforcing bar (screw knot reinforcing bar) that forms a spiral node is provided. In this technique, a reinforcing bar is attached to a rake by screwing a reinforcing bar having a spiral knot on its outer periphery to a connector attached to the head of the rake, and a lock nut is fastened to the reinforcing bar to tie the reinforcing bar. It can be firmly attached to the head of
[0004]
Moreover, the technique (2nd well-known example) disclosed by Unexamined-Japanese-Patent No. 9-250143 is related with "the connection tool for connecting a deformed reinforcing bar to a steel pipe pile", and was welded to the outer periphery of the head part of a steel pipe pile. Consists of a bottomed outer tube and a joint that is removably inserted into the outer tube while forming a screw hole for screwing the lower end of a reinforcing bar (threaded bar) with a spiral knot on the outer periphery It is. In this technique, the threaded reinforcing bar is screwed into the joint, and the joint is inserted into the outer tube so that the reinforcing bar can be attached to the head of the steel pipe pile.
[0005]
Moreover, the technique (3rd well-known example) disclosed by Unexamined-Japanese-Patent No. 2001-11871 is related with "the pile head end part structure by the protrusion type metal fitting of a ready-made pile", and the substantially same ring as the internal diameter and outer diameter of a ready-made pile. Protrusions with bolt holes or female screw holes on the outer periphery of the part are integrally formed, and the lower part of this ring part is welded and fixed to the pile head, and ready-made piles and foundation slabs are joined to the bolt holes and female screw holes. This is a fixed rebar (screw joint rebar). In this technique, a screw nut can be firmly attached by fastening a lock nut to a screw joint reinforcing bar attached to a bolt hole or a female screw hole.
[0006]
In each of the above-mentioned known examples, a threaded reinforcing bar with a spiral protrusion formed on the outer periphery is used as a reinforcing bar that connects the pile to the foundation concrete, and this threaded reinforcing bar is connected to the outer periphery of the pile head. Are screwed onto a connector (joint, protrusion) provided with a female screw for screwing. For this reason, the connection operation | work of the reinforcing bar with respect to the pile embed | buried under the ground can be performed easily.
[0007]
Moreover, the screw joint reinforcing bar used in each known example is configured in accordance with JIS 3112, and a spiral node is formed on the outer peripheral surface at a predetermined pitch according to the nominal diameter during the manufacturing process by hot rolling. Yes. The threaded bar has two planes formed along the longitudinal direction and over the entire length, and therefore, the spiral threaded section is cut by these planes.
[0008]
[Problems to be solved by the invention]
As described above, the threaded joint reinforcing bar is not threaded by rolling or die machining, and its accuracy is poor. Moreover, the pitch of the screw nodes is large, and the continuity is also impaired by the two opposing planes. For this reason, there is a problem that the backlash is large even when screwed into the connecting tool in the first known example and the female thread portion formed on the protrusion in the third known example, and the use of a lock nut is indispensable. .
[0009]
Further, in the second known example, there is a problem that the construction of the grout is indispensable in order to prevent backlash after attaching the joint screwed with the threaded reinforcing bar to the mantle ring.
[0010]
Further, in the third known example, since the annular portion and the protruding portion are integrally formed, it is possible to prepare many types of end face fittings corresponding to the number and thickness of the screw joint reinforcing bars connected to the pile head. There is a problem that it becomes necessary.
[0011]
In each of the known examples, the screw joint reinforcing bar is directly screwed into a connecting tool provided with a female screw. Therefore, these connecting tools have a problem that the diameter of the screw connecting bar becomes very large with respect to the diameter of the screw connecting bar. Furthermore, in order to screw the threaded joint reinforcing bar directly into the connector, etc., it is not possible to use a pre-bent threaded joint, and when bending the threaded joint, after fixing it to the pile head There is a problem that workability is poor, and there is a problem that the machining itself becomes difficult when the diameter of the threaded reinforcing bar exceeds a certain thickness (about 25 mm).
[0012]
An object of the present invention is to provide a pile head structure having a simple structure with less play when a reinforcing bar is attached, and a pile head fitting capable of realizing the attachment of a bent reinforcing bar to the pile head. There is.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the pile head structure according to the present invention has a deformed shape in which a screw member formed with a female screw and welded to the outer periphery of the pile head and a joint bolt to be screwed into the female screw of the screw member are joined. The pile head is fixed inside the foundation concrete via a deformed reinforcing bar having a reinforcing bar and screwed with a joint bolt to the screw member of the pile embedded in the ground.
[0014]
In the above-mentioned pile head structure, a screw member having a female screw formed on the outer periphery of the pile head is welded, and the deformed reinforcing bar is fixed to the pile head by screwing a joint bolt joined to the deformed reinforcing bar to this screw member. I can do it. Unlike the threaded reinforcing bar, each of the female screw and the intermediate bolt formed on the screw member has a highly accurate threaded portion. For this reason, when the deformed reinforcing bar is fastened to the screw member welded to the head of the pile, it is possible to realize joining with high accuracy.
[0015]
In particular, when connecting deformed bars to the outer periphery of the pile head, by changing the shape of the connection part from screw joints to standard screws represented by bolts and nuts, it is possible to obtain predetermined joint performance with small torque . For this reason, a large force is not required when performing the connection work, and the work can be easily performed.
[0016]
In general, the pitch of the bolt is small compared to the pitch of the threaded reinforcing bar. Therefore, when fastening a deformed rebar with a joint bolt to a screw member, it is necessary to increase the number of rotations of the deformed rebar, but to reduce backlash. This is advantageous because the mounting accuracy can be guaranteed and a lock nut is unnecessary.
[0017]
Further, the pile head metal fitting according to the present invention comprises a deformed reinforcing bar in which a female screw is formed and welded to the outer periphery of the pile head, and a joint bolt that is screwed to the screw member is integrally joined to an end portion. Alternatively, a screw member formed with a female screw and welded to the outer periphery of the pile head, a joint bolt that is screwed to the screw member, and a coupler that forms a female screw that is screwed to the joint bolt at the end are integrated. It consists of deformed reinforcing bars joined together.
[0018]
In the above pile head metal fittings, there is a difference between joining the joint bolt directly to the deformed reinforcing bar or via a coupler, but it is substantially the same, and high installation accuracy is achieved with simple work. It is possible to guarantee that the deformed reinforcing bar can be connected to the pile head.
[0019]
In the above-mentioned pile head metal fitting, the intermediate bolt is preferably made of a material having high strength compared to the deformed reinforcing bar and has a small diameter compared to the deformed reinforcing bar, and the joint portion between the intermediate bolt and the deformed reinforcing bar It is preferable that the cross-sectional shape of this is a substantially polygon. By constructing the pile head metal fitting in this way, the diameter of the joint bolt can be made smaller than the diameter of the deformed reinforcing bar, and the outer diameter of the screw member can be made smaller as the diameter of the joint bolt is made smaller. I can do it.
[0020]
Moreover, a spanner or a wrench can be hung on this polygonal part by making the cross-sectional shape of the junction part of a joining bolt and a deformed reinforcing bar into a polygon. For this reason, workability | operativity improves and a fixed torque can be made to act using a torque wrench especially when fastening a joint bolt with a screw member.
[0021]
Further, it is preferable that the intermediate bolt is formed with a male screw from both ends in the longitudinal direction and a portion where no screw is formed at the center. In the thus constructed pile head metal fitting, the screwing depth with respect to the screw member and the screwing depth with respect to the coupler can be controlled at the portion where the central screw is not formed.
[0022]
Further, it is preferable that the intermediate bolt is provided with a polyhedron at the center in the longitudinal direction, a right male screw formed from one end side in the longitudinal direction, and a left male screw formed from the other end side. In a pile head bracket constructed in this way, a polyhedron provided in the center is hung with a spanner or wrench and rotated in a predetermined direction, so that the pile is connected via a joint bolt and screw member without rotating the deformed rebar. Can be attached to the head.
[0023]
For this reason, even if it is a deformed reinforcing bar previously bent, it can be easily attached to the head of the pile by joining a coupler to the end of the deformed reinforcing bar. Therefore, even a deformed reinforcing bar having a large diameter that is difficult to be bent by field work can be attached by bending it into a desired shape in advance.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the pile head structure and the pile head metal fitting will be described with reference to the drawings. FIG. 1 is a diagram illustrating a pile head structure. FIG. 2 is a view for explaining the pile head structure and is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a diagram for explaining the configuration of the pile head bracket according to the first embodiment. FIG. 4 is a view for explaining a cross-sectional configuration of a screw member and a coupler in the pile head fitting according to the first embodiment. FIG. 5 is a diagram for explaining the configuration of a pile head metal fitting according to the second embodiment. FIG. 6 is a diagram for explaining the configuration of a pile head metal fitting according to the third embodiment. FIG. 7 is a view for explaining the configuration of a pile head metal fitting according to a fourth embodiment using a joint bolt in which a right screw and a left screw are formed in the longitudinal direction.
[0025]
First, the pile head structure will be described with reference to FIGS. In addition, the pile head metal fitting used for this pile head structure is not limited only to the structure shown to a figure, It is possible to use the pile head metal fitting concerning the other structure mentioned later.
[0026]
The pile head structure shown in the figure includes a pile 1 embedded in a target position of the ground, a plurality of screw members 2 welded to the head 1a of the pile 1 and formed with female screw portions 2a, and each screw member 2. A joint bolt 3 screwed to the female screw portion 2a, and a coupler 4 having a female screw portion 4a for screwing the joint bolt 3 and integrally joined to the end of the deformed reinforcing bar 5. The foundation concrete 6 adheres to the deformed reinforcing bar 5 so that the pile 1 and the foundation concrete 6 are integrated.
[0027]
In addition, when forming the foundation concrete 6, the vicinity of the head 1a of the pile 1 is excavated and exposed in advance, and the ground work corresponding to the foundation concrete 6 is performed with the head 1a exposed. Abandoned concrete 7 is cast as it is applied.
[0028]
Moreover, the structure of the pile 1 is not specifically limited, It is possible to use piles, such as a hollow steel pipe pile using a steel pipe, and a concrete pile which covered the steel pipe on the head. And when the pile 1 is a hollow pile, the concrete 8 is cast also by this hollow part, and, thereby, the pile 1 is comprised as a solid pile.
[0029]
When the pile head structure is configured, a plurality of screw members 2 are welded to the head 1a of the pile 1 in advance, and the pile 1 is embedded at a target position in the ground. At this time, the method for burying the pile 1 is not particularly limited, but it is preferable to adopt a method in which a large impact does not act on the head 1a.
[0030]
Then, after the pile 1 is buried in the ground, the ground is excavated to expose the head 1a of the pile 1 and the surroundings are excavated to apply the ground work to the site where the foundation concrete 6 is to be constructed. Thereafter, the discarded concrete 7 is cast, and the deformed reinforcing bar 5 is attached to the pile 1 before and after the casting.
[0031]
That is, the joint bolt 3 is screwed to the screw member 2 attached to the head 1a of the pile 1 and the coupler 4 integrally joined to the deformed reinforcing bar 5 is screwed and fastened. At this time, since the female screw portion 2a of the screw member 2, the female screw portion 4a of the coupler 4, and the intermediate bolt 3 are formed as metric screws, the accuracy when they are screwed is maintained at a high level. Good fastening without backlash is achieved.
[0032]
Moreover, a formwork is installed in the site | part which should build the foundation concrete 6, and the target foundation is constructed | assembled by placing concrete into the inside of this formwork and the inside of the pile 1. FIG.
[0033]
In the above configuration, the deformed reinforcing bar 5 is firmly connected to the pile 1 through the intermediate bolt 3 and the screw member 2. For this reason, it is possible to satisfactorily integrate the placed concrete foundation 6 with the pile 1 via the deformed reinforcing bar 5 and construct a highly reliable foundation structure.
[0034]
In particular, the intermediate bolt 3 is joined to the end of the deformed reinforcing bar 5 and screwed into the screw member 2 to connect the deformed reinforcing bar 5 to the pile 1 and transmit the force acting on the deformed reinforcing bar 5 or the pile 1 to the other. It has the function to do. For this reason, the intermediate | middle bolt 3 should just have the said function, and does not limit a structure or a structure. That is, the intermediate bolt 3 may be joined to the deformed reinforcing bar 5 via the coupler 4, or may be directly joined to the end of the deformed reinforcing bar 5.
[0035]
Next, an example of a pile head metal fitting used when configuring the above pile head structure will be described.
[0036]
3 and 4 illustrate the configuration of the pile head metal fitting according to the first embodiment, which is used when the above-described pile head structure is configured.
[0037]
In the drawing, the pile 1 is configured as a steel pipe pile or a pile such as a concrete pile with a steel pipe covered on the head, in which weldable steel is disposed on the head. That is, the pile 1 only needs to be configured to have a material capable of welding the screw member 2 to the head 1a, and does not limit whether the main body portion is a steel pipe or concrete. In this embodiment, a steel pipe pile is used as the pile 1.
[0038]
The number of the screw members 2 welded to the head 1 a of the pile 1 is not particularly limited, and is set according to conditions such as the thickness of the deformed reinforcing bar 5 and the cross-sectional area of the pile 1. That is, when the pile 1 is a steel pipe pile, the cross-sectional area of the deformed reinforcing bar is set and set so that the allowable tensile force (allowable tensile stress x cross-sectional area) of the steel pipe is equal to the allowable tensile force of the deformed reinforcing bar. A number that satisfies the cross-sectional area and does not cause extreme directivity when arranged on the outer periphery of the head 1a is set.
[0039]
For example, the smaller the number of deformed reinforcing bars placed on the head 1a of the pile 1, the easier the welding operation of the screw member 2 and the attaching operation of the deformed reinforcing bar to the screw member 2. When this occurs, a so-called directionality in which this force cannot be supported evenly occurs. In order to ignore the directionality, it is necessary to arrange the screw members 2 at positions where the outer periphery of the head 1a is equally divided into a large number. For this reason, in the present Example, the screw member 2 is welded to the position which divided | segmented the head 1a of the pile 1 into 8 parts which is the minimum division | segmentation number which can disregard directionality, respectively.
[0040]
The screw member 2 is formed with a female screw portion 2a into which the joint bolt 3 is screwed, and the axis of the pile 1 and the axis of the female screw portion 2a are parallel to the outer periphery of the head 1a of the pile 1. Arranged and welded. For this reason, it is preferable that the screw member 2 is formed of steel, and the outer shape is polygonal so that the outer shape can be stabilized when being contacted with the head 1a of the pile 1 and being welded.
[0041]
In this embodiment, as shown in FIG. 4 (c), the screw member 2 uses a hexagonal bar material, and a female screw portion 2a is formed at the center of the bar material so that one side of the hexagonal surface is formed. Are brought into contact with the outer peripheral surface of the head 1a of the pile 1 and welded.
[0042]
The female screw portion 2a formed on the screw member 2 may be formed so as to penetrate the screw member 2 in the longitudinal direction, or may be formed in a so-called blind shape formed from one end portion to a predetermined depth. . The screw member 2 is welded to the head 1a of the pile 1 at the factory stage where the pile 1 is manufactured. For this reason, it is preferable to protect the female screw portion 2a by covering the open end portion of the female screw portion 2a during transfer to the site or during burial work on the site.
[0043]
In this embodiment, the female screw portion 2a is formed with a preset depth from one side of the screw member 2, whereby the screw member 2 is formed as a blind screw having a bottom portion 2b. Of course, the depth of the female screw portion 2a (the length of the screw portion) is set in advance at the design stage.
[0044]
The screw size of the female screw portion 2 a formed on the screw member 2 is not particularly limited, and is formed corresponding to the size of the intermediate bolt 3 having a size corresponding to the thickness of the deformed reinforcing bar 5.
[0045]
The connecting bolt 3 is connected to the pile 1 by connecting the deformed reinforcing bar 5 to the pile 1 by screwing into the female screw portion 4a formed on the coupler 4 integrally joined to the end of the deformed reinforcing bar 5 and the screw member 2. It has a function of transmitting the force acting on the reinforcing bar 5 or the pile 1 to the other. Therefore, the intermediate bolt 3 is formed as a long bolt having a length shorter than the sum of the length of the female screw portion 2a formed on the screw member 2 and the length of the female screw portion 4a formed on the coupler 4. Has been.
[0046]
The intermediate bolt 3 is formed using a material whose tensile strength is stronger than the tensile strength of the deformed reinforcing bar 5, so that the diameter of the intermediate bolt 3 is smaller than the diameter of the deformed reinforcing bar 5. Therefore, the outer diameter of the screw member 2 and the coupler 4 can be reduced, which is advantageous when storing or transporting the pile 1 in which the plurality of screw members 2 are welded to the head 1a.
[0047]
The thread pitch of the intermediate bolt 3 is not particularly limited, and the thread shape is not particularly limited. That is, the screw formed on the joint bolt 3 can be a commonly used metric coarse screw.
[0048]
The coupler 4 is integrally joined to the end portion of the deformed reinforcing bar 5 and is formed with a female screw portion 4a for screwing the joint bolt 3 over a predetermined depth from one end portion side. A hole 4b for fitting the deformed reinforcing bar 5 is formed over a predetermined depth.
[0049]
Further, the portion corresponding to the female screw portion 4a is preferably formed as a polyhedron so that a spanner or a wrench can be hung. In the present embodiment, as shown in FIG. 4B, the external shape of the female screw portion 4a is formed as a hexagon 4c. However, it does not necessarily have to be the hexagon 4c, and may be a quadrangle.
[0050]
The deformed reinforcing bar 5 is a reinforcing bar that is usually used for a reinforced concrete structure, and the outer periphery is formed with a node 5a protruding in the longitudinal direction and the circumferential direction. The length of the deformed reinforcing bar 5 is set in accordance with the specifications of the foundation concrete set in advance.
[0051]
Then, the end of the deformed reinforcing bar 5 is fitted into the hole 4b of the coupler 4, and the coupler 4 is integrally joined to the end of the deformed reinforcing bar 5 by caulking the outer periphery of the coupler 4 in this state. . Since this caulking is performed at the factory stage, the coupler 4 is integrally joined to the deformed reinforcing bar 5 carried into the site. For this reason, the outer shape corresponding to the hole 4b of the coupler 4 is formed in a circular shape 4d with caulking, as shown in FIG. The caulking method is not particularly limited, and for example, a cold forging method using a swage, a roll caulking method, or the like can be appropriately employed.
[0052]
In the pile head metal fitting of the first embodiment configured as described above, after the pile 1 is embedded at a target position, the head 1a is exposed and the joint bolt 3 is screwed to the female screw portion 2a of each screw member 2. Then, the deformed reinforcing bar 5 can be attached to the pile 1 by screwing the coupler 4 joined to the deformed reinforcing bar 5 to the intermediate bolt 3.
[0053]
In particular, by providing a portion where the screw is not formed at the center of the longitudinal direction of the intermediate bolt 3 in the range of 2 mm to 3 mm, the stop when the screw 2 is engaged with the female screw 2a of the screw member 2 and the female screw 4a of the coupler 4 is stopped. The position can be set, and the intermediate bolt 3 is not biased to either the screw member 2 or the coupler 4, and an even and reliable screwed state can be realized.
[0054]
Next, the structure of the pile head metal fitting according to the second embodiment will be described with reference to FIG. In the figure, the same parts as those in the first embodiment and the parts having the same functions are denoted by the same reference numerals and the description thereof is omitted.
[0055]
The basic structure of the pile head metal fitting according to the second embodiment is the same as that of the first embodiment, but the material of the intermediate bolt 3 is set to be equal to the strength of the deformed reinforcing bar 5. For this reason, the diameter of the intermediate bolt 3 and the diameter of the deformed reinforcing bar 5 are substantially equal, and accordingly, the outer diameters of the screw member 2 and the coupler 4 are larger than those of the first embodiment.
[0056]
Even in the second embodiment configured as described above, it is possible to attach the deformed reinforcing bar 5 to the pile 1 via the intermediate bolt 3. However, since the outer diameter of the screw member 2 increases, Alternatively, it is necessary to be somewhat careful in handling during transportation.
[0057]
Next, the structure of the pile head metal fitting according to the third embodiment will be described with reference to FIG. In this embodiment, the material of the intermediate bolt 3 is set to be able to exhibit higher strength than the material of the deformed reinforcing bar 5. For this reason, the diameter of the intermediate bolt 3 is smaller than the diameter of the deformed reinforcing bar 5, and accordingly, the outer diameter of the screw member 2 is also reduced.
[0058]
The intermediate bolt 3 is directly joined to the end face of the deformed reinforcing bar 5 and integrated. When the intermediate bolt 3 is directly joined to the end face of the deformed reinforcing bar 5, means such as a friction welding method and a stud welding method can be selectively employed. In this embodiment, by employing the friction welding method, A crimping portion 9 is formed at the connection site between the two.
[0059]
When the friction welding method is adopted, either the intermediate bolt 3 or the deformed rebar 5 is chucked and rotated, and the other is chucked and pressed to the rotating side. It is possible to reliably match the hearts, and it is advantageous that the deformed rebar 5 is not shaken when attached to the pile 1.
[0060]
Next, the structure of the pile head metal fitting according to the fourth embodiment will be described with reference to FIG. In this embodiment, the relay bolt 10 has a function as a turnbuckle, and can be easily attached to the pile 1 without rotating the deformed reinforcing bar 5.
This embodiment is advantageous when the deformed reinforcing bar 5 is bent.
[0061]
In the figure, the screw member 2 is formed with a female screw portion 2a formed of a right screw, and the coupler 4 is formed with a female screw portion 4e formed of a left screw. Therefore, the connecting bolt 10 has a right screw 10a on one end side and a left screw 10b on the other end side, and a hexagonal portion 10c that forms a polyhedron for hanging a spanner or a wrench at the center in the longitudinal direction. Yes.
[0062]
Accordingly, the right screw 10a of the intermediate bolt 10 is brought into contact with the female screw portion 2a of the screw member 2, and the female screw portion 4e of the coupler 4 integrally joined to the deformed reinforcing bar 5 is brought into contact with the left screw 10b of the intermediate bolt 10. Each of the screws 10a and 10b of the intermediate bolt 10 is turned to the opposite female screw portions 2a and 4e by rotating the intermediate bolt 10 in the right direction as viewed from the deformed reinforcing bar 5 while maintaining this state. By screwing, it is possible to attach the deformed reinforcing bar 5 to the pile 1 without rotating it.
[0063]
【The invention's effect】
As described in detail above, in the pile head structure according to the present invention, the deformed reinforcing bar is fixed to the pile head by screwing the joint bolt joined to the deformed reinforcing bar to the screw member welded to the outer periphery of the pile head. And the fixed deformed reinforcing bar has no play and can maintain high accuracy. In particular, when the intermediate bolt is fastened to the screw member, a lock nut is unnecessary, which is advantageous.
[0064]
Moreover, in the pile head metal fitting according to the present invention, the joint bolt is directly joined to the deformed reinforcing bar directly or via the coupler, so that there is no looseness and high mounting accuracy is guaranteed. And deformed bars can be connected to the pile head.
[0065]
In addition, the joint bolt is made of a material having a higher strength than that of the deformed reinforcing bar, or the cross-sectional shape of the joint portion between the deforming reinforcing bar and the deformed reinforcing bar is made into a substantially polygonal shape, so that the diameter of the connecting bolt is made the diameter of the deformed reinforcing bar. The outer diameter of the screw member can be reduced as the diameter of the intermediate bolt is reduced. You can also hang a spanner or wrench on the polygon. For this reason, workability | operativity improves and a fixed torque can be made to act using a torque wrench especially when fastening a joint bolt with a screw member.
[0066]
Further, by forming a portion in which the screw is not formed at the center in the longitudinal direction of the intermediate bolt, the screwing depth of the relay bolt to the screw member and the screwing depth to the coupler are controlled by the portion where the screw is not formed. I can do it.
[0067]
In addition, a polyhedron is provided in the center in the longitudinal direction of the intermediate bolt, and a right male screw is formed from one end side in the longitudinal direction and a left male screw is formed from the other end side. It can attach to a pile head via an intermediate bolt and a screw member, without rotating a deformed reinforcing bar by applying and rotating in a predetermined direction. For this reason, even if it is a deformed reinforcing bar previously bent, it can be easily attached to the head of the pile by joining a coupler to the end of the deformed reinforcing bar. Therefore, even a deformed reinforcing bar having a large diameter, which is difficult to be bent by field work, can be easily attached.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a pile head structure.
FIG. 2 is a diagram for explaining a pile head structure and a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a diagram for explaining the configuration of a pile head metal fitting according to the first embodiment.
FIG. 4 is a diagram illustrating a cross-sectional configuration of a screw member and a coupler in a pile head metal fitting according to a first embodiment.
FIG. 5 is a diagram for explaining the configuration of a pile head metal fitting according to a second embodiment.
FIG. 6 is a diagram for explaining a configuration of a pile head metal fitting according to a third embodiment.
FIG. 7 is a diagram for explaining a configuration of a pile head bracket according to a fourth embodiment using a joint bolt in which a right screw and a left screw are formed in a longitudinal direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile 1a Head 2 Screw member 2a Female thread part 3 Joint screw 4 Coupler 4a, 4e Female thread part 4b Hole 4c Hexagon 4d Circle 5 Deformed bar 5a Node 6 Foundation concrete 7 Discard concrete 8 Concrete 9 Crimp part
10 Joint bolt
10a right hand thread
10b Left-hand thread
10c Hexagon

Claims (7)

The screw member of the pile embedded in the ground, including a screw member formed with a female screw and welded to the outer periphery of the pile head, and a deformed reinforcing bar joined with a joint bolt to be screwed into the female screw of the screw member A pile head structure characterized in that the pile head is fixed to the inside of the foundation concrete through deformed reinforcing bars screwed with a joint bolt. A pile head bracket comprising: a screw member formed with a female screw and welded to the outer periphery of the pile head; and a deformed reinforcing bar integrally joined with a joint bolt screwed to the screw member at an end portion. A screw member formed with a female screw and welded to the outer periphery of the pile head, a joint bolt that is screwed to the screw member, and a coupler that forms a female screw that is screwed to the joint bolt at the end are integrally joined. A pile head bracket characterized by comprising deformed reinforcing bars. The pile head bracket according to claim 2 or 3, wherein the intermediate bolt is formed of a material having a higher strength than that of the deformed reinforcing bar and has a smaller diameter than that of the deformed reinforcing bar. The pile head bracket according to any one of claims 2 to 4, wherein a cross-sectional shape of a joint portion between the intermediate bolt and the deformed reinforcing bar is a substantially polygonal shape. 4. The pile head bracket according to claim 3, wherein the intermediate bolt is formed with a male screw formed from both ends in the longitudinal direction and a portion where no screw is formed in the center. The relay bolt is characterized in that a polyhedron is provided at the center in the longitudinal direction, a right male screw is formed from one end side in the longitudinal direction, and a left male screw is formed from the other end side. Item 3. The pile head bracket described in item 3.

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