JP2005336967A - Concrete prefabricated pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical end plate structure suitable for a necessary function by maintaining strength and rigidity as a prefabricated pile and reducing amount of use of a steel material of an end plate. <P>SOLUTION: An end plate related to connection among both end plates for fixing a PC steel bar 7 by a concrete pile main body 1 in which PC steel bars 7, 7 are buried is used as a conventional pile end plate 33, and the other end plate is used as a simple end plate 10. An upper end 2 of the prefabricated pile 30B used in the uppermost part of a connection pile is used as the simple end plate 10, and its lower end 3 is used as the pile end plate 33 (b). The simple end plate 10 is constituted by fixing the PC steel bar 7 into a Dharma doll-shaped hole 15, forming width D<SB>23</SB>of the simple end plate 10 to be smaller than width D<SB>13</SB>of a pile main body 1, and burying a terminal face 12, an inner side face 13, and an outer side face 14 into the pile main body 1. When constructing a footing after burying the prefabricated pile 30B into a pile hole, the upper end (concrete face) 2 can be easily fixed because it is exposed, and an upper end part of the prefabricated pile 30B is easily destroyed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a structure in which end plates provided on upper and lower ends of a ready-made pile made of concrete are improved into a compact and compact shape that efficiently satisfies the required functions. That is, the end plate on the surface where the prefabricated pile is joined maintains the strength and quality with the conventional shape, and the end surface on the non-joined side is a shape that has rigidity and strength only for the part related to the rod-shaped steel material, and satisfies the required functions other than joining This is a ready-made pile with a plate structure.

(1) As for the ready-made pile 40 made from concrete, the disk-shaped steel plate called the pile end plate 33 was attached to the up-and-down both ends of the ready-made pile 40. FIG. The pile end plate 33 generally has an outer diameter that matches the outer diameter of the ready-made pile 40, and an inner diameter that matches the hollow portion diameter (inner diameter) of the ready-made pile 40, and is a shaft embedded in the concrete of the ready-made pile 40. PC steel bars 7 and 7 in the direction were fixed. Since a prestress of 4 to 10 N / mm ² was introduced into the PC steel rod 7, the steel plate was formed with a thickness (thickness) of about 20 mm (Non-patent Document 1, Patent Document 1).

  Therefore, in the upper pile end plate 33, only the base end surface 35 is in contact with the concrete, and the inner side surface (hollow part side) 36, the outer side surface 37, and the front end surface 34 are not in contact with the concrete (FIG. 1). ).

  A thin steel plate (thickness of about 2 to 3 mm) and a height of about 100 to 300 mm is attached to the outer peripheral side of the upper and lower ends of the ready-made pile 40, and the edge of the reinforcement band 21 is attached. Was fixed to the pile end plate 33 by welding or the like.

(2) The ready-made pile 40 has been used when a foundation pile is constructed by excavating a pile hole in advance (a pre-drilling method) or while excavating (an intermediate excavation method) and burying in the pile hole. The foundation pile usually uses a supporting ground at a depth of several tens of meters from the ground in order to support an overload of a building or the like, or mainly uses a frictional force up to about 10 m from the ground. Was. In addition, there is a construction method in which the foundation pile is pushed directly into the ground by hitting without excavating the pile hole, but it has not been adopted much recently in order to avoid adverse effects such as noise and distortion of ready-made piles.

  Therefore, for the foundation pile, it is necessary to excavate and create a pile hole to a required depth by a so-called pre-excavation method or an intermediate excavation method, and to set a predetermined ready-made pile to the predetermined depth and express it as a supporting force.

In addition, due to restrictions in transportation, one ready-made pile is limited to a length of about 15 m. When the foundation pile uses a supporting ground with a depth of several tens of meters, the required number of ready-made piles 40 are connected and connected. It was constructed as a pile (connected pile) and was laid down to a predetermined depth. In this case, the upper and lower ready-made piles 40 and 40 are connected by overlapping the pile end plates 33 and 33 with each other and welding the end plates to each other or using various connection joints (non- Patent Document 2, Patent Document 2). In this case, the connecting portion is usually structured such that both ends of the ready-made piles 40 and 40 have the same performance as a single ready-made pile.
JP-A-5-339939 JP-A-10-121467 From survey and design of pile foundation to construction, Japan Society for Geotechnical Engineering, May 25, 1993, p212-214 Construction management of ready-made concrete piles, Japan Concrete Pile Construction Technology Association, April 2000, p127

(1) In recent years, there has been a growing demand for foundation piles to increase the yield strength per foundation pile and simplify the foundation of the building. At the same time, a large-diameter pile of ready-made piles 40 is required. Therefore, the structure of the pile end plate 33 of the ready-made pile 40 according to the conventional design technique has been required to have higher bending performance as a function of connecting the ready-made pile 40 up and down. Therefore, the pile end plates 33 and 33 in which the amount of steel material used has increased tend to be employed.

(2) On the other hand, the pile end plates at the uppermost end (the end on the ground side) and the lowermost end (the supporting ground side) that are not used for connection did not require bending performance and had excessive performance.

  At the uppermost end, the upper end of the foundation pile generally called footing is connected to the upper structure and fixed in the concrete structure. Therefore, the upper end portion of the ready-made pile is broken in order to fix it with the structural reinforcing bar of the footing, and the structural reinforcing bar is exposed. Of course, the pile end plate 33 may be removed and removed.

  Further, at the lowermost end, the pile end plate 33 has little influence on the reinforcement of the supporting force, and in order to fix the lower end portion of the ready-made pile 40 to the cement milk layer at the rooting portion formed on the supporting ground, In some cases, it was better not to have the plate 33.

  In particular, in a single pile that does not need to connect upper and lower piles, a pile end plate having bending performance equivalent to that of a ready-made pile has been unnecessary.

(3) Therefore, during manufacturing, concrete leakage prevention measures are applied to the mold for centrifugal molding, and through holes and bolt holes for fixing PC steel bars as in the conventional case can be secured. If it is possible to secure the minimum rigidity having the above, it is desirable to form the pile end plate as easily as possible from the viewpoint of effective use of resources and cost.

  In addition, when attaching the upper end part of a ready-made pile to a pile driving machine, the penetration hole, bolt hole, or reinforcement band for PC steel rod fixation is used, and this conventional penetration hole, bolt hole, reinforcement band is used. If it could be secured, it would be a hindrance.

  However, since the present invention uses a simple end plate in which the inner peripheral side and / or the outer peripheral side surface of the base is brought into contact with the concrete body, the above-mentioned problems are solved.

That is, the present invention is a ready-made pile in which a rod-shaped steel material is embedded in a concrete body and the end plates for fixing the rod-shaped steel material are attached to the upper and lower ends of the concrete body, and has the following structure. It is a ready-made pile made of concrete.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) In the longitudinal cross section in the radial direction of the base body, the inner peripheral side and / or the outer peripheral side surface of the base body are embedded in the concrete body.

Further, another invention is a ready-made pile in which a rod-shaped steel material is embedded in a concrete body, and end plates for fixing the rod-shaped steel material are attached to the upper and lower ends of the concrete body, and has the following structure. This is a ready-made pile made of concrete.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) In the longitudinal cross section in the radial direction of the base body, the other surface excluding the front end surface of the base body was embedded in the concrete body.

Further, another invention is a ready-made pile in which a rod-shaped steel material is embedded in a concrete body, and end plates for fixing the rod-shaped steel material are attached to the upper and lower ends of the concrete body, and has the following structure. This is a ready-made pile made of concrete.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) The concrete body was exposed at the end surface of the concrete body on the side where the simplified end plate was installed.

Further, another invention is a ready-made pile in which a rod-shaped steel material is embedded in a concrete body, and end plates for fixing the rod-shaped steel material are attached to the upper and lower ends of the concrete body, and has the following structure. This is a ready-made pile made of concrete.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) A difference between an inner diameter and an outer diameter of the concrete body or the end plate is defined as a width, and a width of the simple end plate is formed smaller than a width of the concrete body.

Furthermore, it is the ready-made pile made from concrete characterized by having the following structure in the above.
(1) The reinforcement band which consists of a cylindrical thin steel plate was coat | covered on the outer periphery of the upper end part of the concrete main body.
(2) The upper end of the reinforcing band was extended inward to form an annular rib.
(3) The connecting piece formed on the reinforcing band was connected to the base of the simple end plate.
Further, in the above, a concrete ready-made pile in which a connecting piece that is continuous or intermittently connected along the ring is connected to the inner surface or the annular rib of the reinforcing band, and the connecting piece is connected to the base of the simple end plate. It is.

  The concrete ready-made piles mentioned above are those whose main structure is made of concrete, and also include so-called outer shell steel pipe concrete piles whose outer periphery is covered with a steel pipe.

  Moreover, the rod-shaped steel material in the above refers to rebars conventionally joined to an end plate, such as a PC steel rod and a structural rebar arranged in the axial direction.

  In the present invention, the inner peripheral side and / or the outer peripheral side surface of the base body is embedded in the concrete body, so that the end plate shape can be reduced to about “one half” of the conventional one, so that the amount of steel used can be saved. Thus, an efficient and lean structure that matches the required function of the end plate portion can be obtained. Therefore, it is possible to realize an economical end plate structure that is resource-saving and low-cost.

  In particular, the foundation pile for a single pile does not require a joint pile, so the conventional end plate structure is completely unnecessary, and both end faces of the ready-made pile can be formed with the end plate of the present invention, which is commensurate with its cost. A large economical foundation pile can be constructed.

In the ready-made pile 30 of the present invention, the PC steel rods 7 and 7 are embedded in the concrete pile main body 1, and at least one of the both end plates fixing the PC steel rod 7 is the simple end plate 10. Features (FIG. 2). The simple end plate 10 in the above is used in a place where the function of connecting the ready-made pile 30 up and down is not required. That is, there are cases as follows.
(1) In the case of the ready-made pile 30A used alone, the simple end plates 10 and 10 are used for the upper and lower ends 2 and 3 (FIG. 4A).
(2) In the case of the ready-made pile 30B used for the uppermost end, the upper end 2 is the simplified end plate 10 and the lower end 3 is the normal pile end plate 33 (FIG. 4B).
(3) In the case of the ready-made pile 30C used for the lowermost end, the upper end 2 is a normal pile end plate 33 and the lower end 3 is a simple end plate 10 (FIG. 4 (c)).
(4) A ready-made pile located in the middle connecting other ready-made piles up and down is not within the scope of the present invention.

  In the above, in the part using the simple end plate 10, the front end surface 11 of the simple end plate 10 is exposed, and the base end surface 12 is embedded in the concrete pile main body 1. One or both of the inner side surface 13 and the outer side surface 14 of the simple end plate 10 are embedded in the concrete pile body 1 (FIGS. 2B, 6 </ b> A and 6 </ b> B). Moreover, in the part using the simple end plate 10, the upper surface 2 or the lower surface 3 of the pile body 1 made of concrete is exposed on the tip surface 11 side (FIGS. 2A and 4).

Further, since the means for fixing the PC steel rod 7 (dharma hole 15 and the like) is usually about 22 to 24 mm, the width D ₂₃ of the simple end plate 10 is the thickness t _{2 of the} steel material and the structure of the reinforcing band 21. However, it is possible if it is about 30 mm (FIGS. 2A and 2B). In the case of the pile main body 1 having an outer diameter of 800 mm, the concrete width (thickness) D ₁₃ of the pile main body 1 is about 110 mm. In this case, the simple end plate 10 of the present invention, it is possible width _{D 23} to about 30 mm,
D ₂₃ / D ₁₃ ≈1 / 4
Can be about.

  An embodiment of the present invention will be described based on the drawings.

[1] Configuration of ready-made pile 30

(1) A pile body 1 made of concrete is formed with an outer diameter D ₁₂ , an inner diameter D ₁₁ , and a length L, and a PC steel rod 7 is embedded in a plane ring substantially at the center of a width (thickness) D _13. (FIG. 2). Further, deformed reinforcing bars (structural reinforcing bars in the axial direction) and helical reinforcing bars (shear reinforcing reinforcing bars) are arranged between the PC steel bars 7 and 7 (not shown). The width _{D 13} of pile body 1 in above,
D ₁₃ = (D ₁₂ -D ₁₁ ) / 2
It has become.

(2) The top surface 2 of the pile body 1 is made of a steel plate having a rectangular shape in cross section with a thickness (height) t ₂ and a width D ₂₃ , and an annular simple end that can fix the end 9 of the PC steel rod 7. A plate 10 is embedded. The simple end plate is formed with an inner diameter D ₂₁ and an outer diameter D ₂₂ , and a distal end surface (upper surface) 11 is formed flush with the upper surface 2 of the pile body 1, and an inner side surface 13, an outer surface 14, and a proximal end surface (bottom surface). 12 is embedded in the pile main body 1 and is fixed in contact with the concrete of the pile main body 1. The width D ₂₃ of the simplified end plate 10 is
_{D 23 = (D 22 -D 21} ) ÷ 2
It has become.

  In the simple end plate 10, daruma holes 15, 15 are formed in accordance with the installation position of the PC steel bar 7. The daruma hole 15 is formed by a large-diameter hole 16 through which the large-diameter portion 9 of the PC steel rod 7 can be inserted and a small-diameter hole 17 through which the shaft portion 8 of the PC steel rod 7 can be inserted and the large-diameter portion 9 cannot be inserted. The two holes 16 and 17 communicate with each other. An enlarged diameter portion 18 is formed at the tip of the small diameter hole 17, and the large diameter portion 9 of the PC steel rod 7 is engaged with the enlarged diameter portion 18. The structure of the daruma hole 15 is the same as the conventional one. The enlarged-diameter portion 18 of the small-diameter hole 17 has a cylindrical shape with a curved bottom side (FIG. 5 (a)).

  Moreover, the cylindrical reinforcement band 21 is attached to the upper end part of the pile main body 1, and the upper edge 22 of the reinforcement band 21 is bent horizontally along the upper surface of a pile end plate, and the annular rib 23 is formed. Yes. The inner peripheral edge 24 of the annular rib 23 and the simplified end plate 10 are not in contact with each other.

(3) A pile end plate 33 similar to the conventional one is attached to the lower surface 3 of the pile body 1. The pile end plate 33 is made of a steel plate having a thickness (height) t ₁ and is formed with the same inner diameter D ₁₁ and outer diameter D ₁₂ as the pile main body 1, and the base end face 35 is embedded in the pile main body 1, The surface 34, the inner surface 36, and the outer surface 37 are exposed and do not contact the concrete of the pile body 1.

  Also in the pile end plate 33, daruma holes 15 and 15 are formed in accordance with the installation positions of the PC steel rods 7 and 7 as in the prior art. The daruma hole 15 is formed by a large-diameter hole 16 through which the large-diameter portion 9 of the PC steel rod 7 can be inserted and a small-diameter hole 17 through which the shaft portion 8 of the PC steel rod 7 can be inserted and the large-diameter portion 9 cannot be inserted. The two holes 16 and 17 communicate with each other. An enlarged diameter portion 18 is formed on the distal end side of the small diameter hole 17, and the large diameter portion 9 of the PC steel rod 7 is engaged with the enlarged diameter portion 18.

  A cylindrical reinforcing band 21 is attached to the lower end portion of the pile body 1, and the leading edge 22 of the reinforcing band 21 is fixed to the pile end plate 33 by welding. Usually, the reinforcing band is 2 to 3 mm thick and has a width of 20 to 30 cm and is attached to the outer periphery (outer surface 5) of the pile body 1.

(4) As described above, the ready-made pile 30B for the uppermost pile is configured (FIGS. 2A and 2B).

The numerical values in the above are set as follows, for example.
Inner diameter D ₁₁ of the pile body 1 = 580 mm
Outer diameter D ₁₂ = 800 mm
Width D ₁₃ = 110mm
Inner diameter D ₁₁ of the pile end plate 33 = 580 mm
Outer diameter D ₁₂ = 800 mm
Width D ₁₃ = 110mm
Thickness t ₁ = 19-22mm
Inner diameter D ₂₁ of the simple end plate 10 = 660 mm
Outer diameter D ₂₂ = 720 mm
Width D ₂₃ = 30mm
Thickness t ₂ = 35mm

  Therefore, in this case, when the volumes of the conventional pile end plate 33 and the simple end plate 10 are compared, the amount of steel used can be reduced by about 50 to 60% if the simple end plate is used.

[2] Manufacturing method and usage

(1) In a mold for centrifugal molding (not shown), rebar rods such as structural reinforcing bars and shear reinforcing bars, simple end plates 10, 10 and PC steel bars 7 and 7 are attached and filled with ready-mixed concrete. Then, in the same process as before, stress is introduced into the PC steel bar 7, and the ready-made pile 30 is manufactured by molding, demolding and curing. At this time, if necessary, the periphery of the simple end plate 10 is appropriately closed in order to prevent leakage of the concrete.

(2) The completed ready-made pile 30 is transported to the construction site as in the past, and is embedded in the pile hole to construct the foundation pile. Under the present circumstances, since the ready-made pile 30 is supported by the pile driving machine using the dharma holes 15 and 15 like the conventional ready-made pile, the embedding work of the ready-made pile 30 can be performed similarly to the conventional.

(3) In the ready-made piles 30A and 30C positioned at the lowermost end, the simple end plate 10 is used at the lower end, so that it is possible to enhance the fixation between the cement milk in the root-solidified portion and the ready-made piles 30A and 30C. Moreover, since the simple end plate 10 is arrange | positioned at the upper end in ready-made pile 30A, 30B located in the uppermost part, an upper end part can be destroyed easily and a structural reinforcement can be exposed.

[3] Other embodiments

(1) In the above embodiment, the simplified end plate 10 has a rectangular cross section (FIGS. 5A, 5B, and 5C), but the lower part may be a semicircle and the upper part may be a rectangle (FIG. 5D). )). Also, an inverted triangle (e), a trapezoid (f), a rectangle on the outside, and a “quarter” circle (g) on the inside can be used. The large-diameter portion 18 of the small-diameter hole 17 has a cylindrical shape with a rounded bottom (FIG. 5A), but can also be an inverted triangular pyramid (c) or a cylindrical shape (c). These shapes and structures are matched to the required strength such as adhesion to a simple end plate that introduces pre-stress or propagation of shear force to the base end surface 12 of the simple end plate (surface contacting the concrete of the pile body 1). Select and use as appropriate.

(2) Moreover, in the said Example, although the clearance gap was opened without contacting the annular rib 23 of the upper end 22 of the reinforcement band 21, and the simple end plate 10, the inner peripheral edge 24 of the annular rib 23 was extended inside. Thus, an annular connecting piece 25 along the inner peripheral edge can be formed, and the inner peripheral side of the connecting piece 25 can be fixed to the simplified end plate 10 (FIG. 3). In this case, the outer edge chipping of the ready-made pile 30 can be reliably prevented.

In this case, the connecting piece 25 can be formed intermittently by providing gaps 26 and 26 instead of being annular (FIGS. 7 and 8). In this case, for example, the connecting pieces 25 and 25 having the width L1 are formed at four positions at equal intervals (rotationally symmetric positions every 90 degrees). Width L1 is about the same as the width _{D 23} of the simple end _plate, or be larger than _{D 23,} from shear propagation and adhesion to the concrete, the desired (FIG. 7 (a) (b)) . Since the connecting pieces 25 are formed at symmetrical positions, the stress from the simple end plate 10 can be transmitted uniformly.

  Further, the connecting piece 25 is formed from the same substrate as the reinforcing band 21, or is formed from another material having a thickness equal to or greater than that of the reinforcing band 21. Therefore, in this case, the connecting piece 25 having the width L1 is welded and fixed to the inner peripheral edge 24 of the annular rib 23.

(3) In the embodiment of (2), the connecting piece 25 can be embedded in the concrete (FIGS. 9 and 10). In this case, the connecting pieces 25 and 25 having the width L1 are provided on the inner surface 21a of the reinforcing band 21 and the gaps 26 and 26 are provided, and are fixed to the rotationally symmetric positions, and the connecting pieces 25 and 25 are attached to the lower surface 12 ( Or it fixes to the outer surface 14) (FIG. 9, 10). In this case, it is possible to form the connecting piece 25 in an annular shape without forming the gap 26 (not shown).

  Thus, when connecting using the connection piece 25, the integrity of the simple endplate 10 and the reinforcement band 21 improves, and the proof strength with respect to the horizontal force etc. in the concrete edge part of the ready-made pile 30 can be strengthened. . In addition, positioning using the end face becomes easy at the time of manufacturing, and the manufacturing work is stabilized. In addition, it is easy to position the ready-made pile 30 by using the end face by transferring and embedding the ready-made pile 30 made of concrete, and the reliability and stability of the work are improved.

(4) Moreover, in the said Example, although the simple end plate 10 made the inner surface 13 and the outer surface 14 contact the concrete of the pile main body 1, although the usage-amount of steel materials increases a little, the outer surface 14 is made into a pile main body. 1 and can be fixed to the upper edge 22 of the reinforcing band 21 (FIG. 6A). In this case, the inner side surface 13 and the base end surface (lower surface) 12 of the simplified end plate 10 are provided. Contact with concrete. By adopting such a structure, the corners on the outer peripheral sides of both ends of the ready-made pile 30 are reinforced, the edge of the ready-made pile 30 is prevented from being chipped when burying the pile hole, and the ready-made pile 30 is easier to handle. As a result, the stability of the product is improved.

  Conversely, the inner side surface 13 of the simple end plate 30 can be extended to the inner surface 4 of the pile body 1 (FIG. 6B). In this case, the outer side surface 14 and the base end surface (lower surface) 12 of the simple end plate 10 are in contact with the concrete. Further, the annular rib 23 of the reinforcing band 21 is fixed to the simple end plate 10. In addition, when the annular rib of the reinforcing band 21 is combined with the above embodiments (2) and (3), the proof stress and handling property of the ready-made pile are further improved and stabilized.

(5) Moreover, although the said Example demonstrated "the connection pile 30B used for the uppermost part" which has the simple edge board 10 in the upper surface 2 of the pile main body 1, and the conventional pile end board 33 in the lower surface 3, (FIG. 4). (B)), a conventional pile end plate 33 on the upper surface 2 and a simple end plate 10 on the lower surface 3 can be used as the “connected pile 30C used in the lowermost part” (FIG. 4 (c)). It is also possible to use the simple end plates 10 and 10 for the lower surfaces 2 and 3 to make a “ready-made pile 30A for a single pile” (FIG. 4A).

(6) Moreover, in the said Example, although the hole which latches the PC steel rod 7 was the daruma hole 15, if the PC steel rod 7 in which prestress is introduce | transduced can be latched to the simple end plate 10, it will be a screw hole. The structure is arbitrary (not shown).

(7) Further, in the above embodiment, although the thickness t ₂ of the simplified end plate 10 and the same, and potbelly holes 15 and the thickness t ₂ of the peripheral portion thereof, to form other portions thinner than t ₂ (Not shown). In this case, one or both of the distal end surface 11 side and the proximal end surface 12 side are recessed to form a thin wall.

Further simple end plate 10 has been formed in an annular shape, if introduced stress by fixing the PC steel rod 7, to form a potbelly hole 15 and the peripheral portion thereof with a thickness t _2, during the potbelly holes 15, 15 An intermittent structure in which a gap is provided may also be provided (not shown). In this case, the data amount of the steel material used for the simple end plate 10 can be further saved.

(8) Further, in the embodiment, it is desirable to form the front end surface (upper surface) 11 of the simple end plate 10 substantially flush with the upper surface 2 of the pile body 1 from the viewpoint of manufacturing the ready-made pile 10 (see FIG. 2 (b), FIG. 4 and FIG. 6), if a predetermined amount of stress can be introduced into the PC steel rods 7 and 7, the tip surface 11 can be projected from the top surface 2 of the pile body 1 to the tip side (upward) ( Not shown). Accordingly, the distal end sides of the inner and outer surfaces 13 and 14 of the simple end plate 10 are exposed from the upper surface 2 of the pile body 1, and the proximal ends of the side surfaces 13 and 14 are embedded in the concrete of the pile body 1.

  Further, the inner and outer surfaces 13, 14 of the simple end plate 10 are all exposed from the upper surface 2 of the pile body 1, and the base end surface 11 of the simple end plate 10 is placed on the upper surface 2 of the pile body 1. (Not shown).

  When the simple end plate 10 is protruded from the upper surface 2 of the pile body 1 in this way, attachment of various tip shoes to the lower simple end plate 10, attachment of various handling jigs to the upper simple end plate 10, etc. This function can also be added. Furthermore, it is possible to easily fix the footing and the structural reinforcing bars in the rooting portion, fix the steel reinforcing material, and connect the surrounding concrete.

It is a prior art example of this invention, (a) is a top view of an end plate, (b) is a longitudinal cross-sectional view of the ready-made pile which attached the end plate. In the Example of this invention, (a) is a top view of an end plate, (b) is a longitudinal cross-sectional view of the ready-made pile which attached the end plate. It is a perspective view in the state where a part was cut off by the ready-made pile of this invention. (A) (b) is the longitudinal cross-sectional view which was the ready-made pile of this invention, and was schematic. (A)-(g) is an end elevation of the other Example of the simple end plate of this invention. (A) (b) is another example, and is a schematic vertical view of the upper end part of a ready-made pile. (A) is a top view of the other Example of this invention, (b) is sectional drawing which abbreviate | omitted one part in the AOB line of (a). It is the perspective view which cut off part similarly. (A) is a top view of the other Example of this invention, (b) is sectional drawing which abbreviate | omitted one part in the COD line of (a). It is the perspective view which cut off part similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pile body 2 Pile body top surface 3 Pile body bottom surface 4 Pile body inner surface 5 Pile body outer surface 7 PC steel bar (rod-shaped steel)
8 Shaft portion of PC steel rod 9 Large diameter portion of PC steel rod 10 Simplified end plate 11 Simplified end plate tip surface 12 Simplified end plate base end surface 13 Simplified end plate inner surface 14 Simplified end plate outer surface 15 Daruma hole (Fixing part)
16 Large-diameter hole 17 Small-diameter hole 18 Large-diameter portion 21 of small-diameter hole Reinforcing band 21a Inner surface 23 of reinforcing band Annular rib 24 Inner peripheral edge 25 of annular rib Connection piece 26 Gap 30, 30A, 30B, 30C Pre-made pile 33 Pile end plate ( Conventional example)
34 Pile end plate tip surface 35 Pile end plate base end surface 36 Pile end plate inner side surface 37 Pile end plate outer side surface 40 Ready-made pile

Claims (6)

An end plate for embedding a rod-shaped steel material in a concrete body and fixing the rod-shaped steel material is a ready-made pile attached to the upper and lower ends of the concrete body, and has the following structure. Ready-made pile.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) In the longitudinal cross section in the radial direction of the base body, the inner peripheral side and / or the outer peripheral side surface of the base body are embedded in the concrete body. An end plate for embedding a rod-shaped steel material in a concrete body and fixing the rod-shaped steel material is a ready-made pile attached to the upper and lower ends of the concrete body, and has the following structure. Ready-made pile.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) In the longitudinal cross section in the radial direction of the base body, the other surface excluding the front end surface of the base body was embedded in the concrete body. An end plate for embedding a rod-shaped steel material in a concrete body and fixing the rod-shaped steel material is a ready-made pile attached to the upper and lower ends of the concrete body, and has the following structure. Ready-made pile.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) The concrete body was exposed at the end surface of the concrete body on the side where the simplified end plate was installed. An end plate for embedding a rod-shaped steel material in a concrete body and fixing the rod-shaped steel material is a ready-made pile attached to the upper and lower ends of the concrete body, and has the following structure. Ready-made pile.
(1) At least one of the upper and lower end plates is a simple end plate.
(2) The simple end plate is provided with a fixing portion for fixing the end portion of the rod-shaped steel material in the vertical direction on a continuous or intermittent annular base body along the planar arrangement of the rod-shaped steel material.
(3) A difference between an inner diameter and an outer diameter of the concrete body or the end plate is defined as a width, and a width of the simple end plate is formed smaller than a width of the concrete body.
(4) The upper surface of the concrete body was exposed on the inner peripheral side and / or the outer peripheral side of the simplified end plate. The ready-made pile made of concrete according to any one of claims 1 to 4, wherein the pile is configured as follows.
(1) The reinforcement band which consists of a cylindrical thin steel plate was coat | covered on the outer periphery of the upper end part of the concrete main body.
(2) The upper end of the reinforcing band was extended inward to form an annular rib.
(3) The connecting piece formed on the reinforcing band was connected to the base of the simple end plate. The ready-made pile made of concrete according to claim 5, wherein a connecting piece that is continuous in an annular shape or is intermittently connected along the annular shape is connected to an inner surface or an annular rib of a reinforcing band, and the connecting piece is connected to a base of a simple end plate. .

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