JP6407603B2 - Joint structure between foundation pile and ground structure - Google Patents

Description

The present invention forms a foundation pile by embedding a ready-made pile in the pile hole, and burying the pile head of the ready-made pile in the footing of the ground structure to reliably transmit the load of the ground structure to the ready-made pile. It relates to the joint structure between the foundation pile and the ground structure.

(1) Concrete-based foundation piles were manufactured by centrifugal molding in order to make the concrete denser and higher in strength (usually 85 N / mm ² or more). In this case, the concrete was formed of a cylinder having a certain thickness, and the outer shape was a columnar shape. Therefore, structural reinforcing bars and PC steel bars, or both, are disposed within the wall thickness, and these are embedded in the concrete to exhibit a predetermined strength.
In this case, the structural reinforcing bars are arranged in an annular shape (Patent Document 1).

(2) On the other hand, normally, the ready-made piles are buried in the ground with a structure that can connect a plurality of piles and exhibit a predetermined supporting force, and the pile heads of the ready-made piles that are positioned at the top are buried in the footings of the ground structure It was established, and the weight of the ground structure was transferred to the ready-made piles.
In this case, in order to secure the fixing length with the ready-made pile, the pile head concrete is destroyed, the upper end of the structural rebar in the ready-made pile is exposed, and the structural rebar of this ready-made pile is It was fixed to the grid-structured reinforcing bar.
In addition, in order to save the trouble of destroying the concrete of the pile head, it was also done to connect the reinforcing bar to the structural bar of the ready-made pile with various attachments, and to fix the reinforcing bar to the grid-like structural bar of the footing. (Patent Document 1).
Moreover, in the ready-made pile which wound the steel pipe around the outer periphery of the ready-made pile made from steel pipe, or a concrete pile, the reinforcing bar was sometimes welded to the outer surface of the steel pipe (patent document 2).

JP 2010-144391 A JP, 2014-84573, A

In the above-mentioned conventional technology, in the concrete ready-made pile, the reinforcing reinforcing bars are arranged in an annular shape in the same order as the grid-structured structural reinforcing bars (Patent Document 1), and in the case of the steel pipe ready-made piles, a circle along the outer surface of the steel pipe It was an annular arrangement. Therefore, in order to fix the reinforcing reinforcing bar to the structural reinforcing bar of the footing, it is necessary to bend the upper part of the reinforcing reinforcing bar so as to match the direction of the lattice or to weld another reinforcing bar additionally.
In particular, the strength of ready-made piles has progressed, and the cross-sectional area of ready-made piles that can bear the same bearing capacity can be reduced, and the length of the outer periphery of ready-made piles is shortened, and the number of auxiliary reinforcing bars that can be fixed is also reduced. Therefore, it is necessary to effectively fix the auxiliary reinforcing bars per one to the structural reinforcing bars of the footing.

  Since the present invention has a structure in which the pile head has a straight side in a cross section, it is easy to fix a mounting jig or the like for attaching an auxiliary rebar or a steel beam to the pile head, and the straight side is a grid of footing. If it is arranged perpendicularly (parallel) to the timber-structured reinforcing bars, the auxiliary reinforcing bars can be easily fixed on the lattice-shaped reinforced bars.

That is, the present invention comprises a foundation pile formed by embedding a prefabricated pile into the pile hole, a joint structure and the footing of the ground structure, the out of ready-made pile, already made pile you located uppermost pile The part is connected to the footing of the ground structure, and is a joint structure of the foundation pile and the ground structure configured as follows.
(1) prefabricated pile located at the top forms an integral shape by forming a pile head above the base, the base may be joined to "other ready-made pile located below" the lower edge structure The pile head is formed in a prismatic shape .
(2) The pile head has a transverse cross section, has at least one linear side on the outer periphery, and a plurality of connecting rebars arranged in the vertical direction are arranged, and a lower end portion of the connecting rebar is disposed on the pile head. fixed.
(3) In the footing, lattice-like footing structure reinforcing bars are arranged in plan view, and the linear sides are arranged in parallel with one axial direction of the footing structure reinforcing bars.
(4) and the upper portion of the connecting reinforcing bar is fixed to the footing structure rebar.
(5) An attachment jig was fixed to the side face of the pile head .
(6) The mounting jig includes a first joint portion having a joint surface on the outer surface and a second joint portion having a joint surface on the outer surface, and the first joint portion and the second joint portion are connected to the pile head. The joint surface of the second joint portion was orthogonal to the straight side of the pile head.

In another invention, a foundation pile formed by embedding a prefabricated pile into the pile hole, a joint structure and the footing of the ground structure, the out of ready-made pile, pile already made pile you located in the uppermost head and connected to the footing of the ground structure, a junction structure of the configured groups Ishizuekui and the ground structure as follows.
(1) prefabricated pile located at the top forms an integral shape by forming a pile head above the base, the base may be joined to "other ready-made pile located below" the lower edge structure The pile head is formed in a prismatic shape .
(2) The pile head has a cross-sectional side and at least two straight sides including parallel sides.
(3) A mounting jig was fixed to the side surface of the pile head.
(4) The mounting jig includes a first joint portion having a joint surface on the outer surface and a second joint portion having a joint surface on the outer surface, and the first joint portion and the second joint portion are connected to the pile head. The joint surface of the second joint portion was orthogonal to the straight side of the pile head.
(5) An end surface of one steel beam of the ground structure disposed in the footing is fixed to a side surface corresponding to the linear side, and the other steel beam of the ground structure is fixed to the second joint portion. It was fixed to the joint surface.

Moreover, in each said invention, it is the joining structure of the ground structure with the foundation pile characterized by having comprised as follows.
(1) the mounting jig, first a pair and first joint having a joint surface to be the side surface flush including straight sides response, the joint surface perpendicular to the side surface including the corresponding straight edges a second connecting portion, and configured to have.

In the above, the planar shape of the pile head of the ready-made pile is
(1) Take a straight side to some extent long,
(2) One or more sets of straight sides can be taken in parallel,
(3) Since the shape is close to the base circle, a regular hexagonal shape and a regular octagonal shape are preferable. It should be noted that even a square having a large shape change from the circle of the base of the ready-made pile and a regular triangle or a regular pentagon whose parallel sides cannot be taken in parallel can be applied because the straight sides can be taken longer. In addition, it is necessary to excavate the pile hole in a shape that can accommodate the enlarged pile head, and when excavating the pile hole in a circle that circumscribes the square or equilateral triangle when it is a square or equilateral triangle, As compared with the circular shape of the base, a pile hole having a considerably large diameter has to be formed, which is disadvantageous compared to regular hexagons and regular octagons. For example, the amount of cement milk (or concrete, soil cement) used between the inner wall of the pile hole and the outer surface of the ready-made pile increases.

  In general, when manufacturing an off-the-shelf pile with an integrated prism and column, it is manufactured by rotating the formwork in which the cylindrical part at the bottom of the pile and the prism at the head of the pile are integrated. . At this time, since the weight balance between the cylindrical portion and the prismatic portion is different and the mold is rotated at a high speed in an unstable state, it is necessary to devise in order to rotate it safely. In squares and regular triangles, the distance from the circle core to the corner vertex is long and unbalanced, whereas in regular hexagons and regular octagons, the distance from the circle core to the corner vertex is relatively short and the balance is lost. Since it is small, there is little risk in manufacturing, and no special device is required in manufacturing.

Since this invention forms the pile head which can include a cross-sectional shape in the pile head of a ready-made pile and has a straight side, and connects the pile head to the footing of the ground structure, If the sides are arranged in the direction of the structural reinforcement of the footing, the fixing work between the ready-made pile and the structural reinforcement of the footing can be simplified. Moreover, since a pile head has an external shape adjustment part, the disadvantage accompanying the difference in the shape of a shaft part and a pile head can be reduced.
Furthermore, since it has a straight side, it is easy to fix the mounting jig to the pile head, and if the mounting jig is used, the fixing work with the structural reinforcement of the footing can be simplified. There is an effect that can be supported.

It is a ready-made pile which made the pile head of this invention the hexagon shape, Comprising: It is a type which made the adjustment part of a corner priority long, (a) is a bottom view, (b) is a front view, (c) is a right view. It is. (A) is sectional drawing in the AA line of FIG. 1 in the state which attached the end plate etc., (b) is sectional drawing in the BB line of FIG. This is a ready-made pile with a hexagonal head of the pile according to the present invention, in which the angle-priority adjusting part is shortened, (a) is a bottom view, (b) is a front view, and (c) is a right side view. is there. (A) is sectional drawing in the CC line of FIG. 3 in the state which attached the end plate etc., (b) is sectional drawing in the DD line of FIG. It is a ready-made pile which made the pile head of this invention into an octagon shape, Comprising: It is a type which made the adjustment part of an angle priority long, (a) is a top view, (b) is a front view, (c) is a right view. It is. (A) is the sectional view in the EE line of Drawing 5 in the state where the end plate etc. were attached, and (b) is the sectional view in the FF line of Drawing 5. It is a ready-made pile which made the pile head of this invention into an octagon shape, Comprising: It is the type which shortened the adjustment part of an angle priority, (a) is a top view, (b) is a front view, (c) is a right view. It is. 7A is a cross-sectional view taken along line GG in FIG. 7 with an end plate and the like attached thereto, and FIG. 7B is a cross-sectional view taken along line HH in FIG. (A) is a sectional view taken along line I-I in FIGS. 1 and 3, (b) is a sectional view taken along line JJ, (c) is a sectional view taken along line KK, and (d) is FIG. 7 is a cross-sectional view taken along the line LL in FIG. 7, (e) is a cross-sectional view taken along the line MM, and (f) is a cross-sectional view taken along the line PP. It is a ready-made pile which made the pile head of this invention the hexagon shape, and is a type which made the adjustment part of a circle priority long, (a) is a top view, (b) is a front view, (c) is a right view. . It is a ready-made pile which made the pile head of this invention the hexagon shape, and is a type which shortened the adjustment part of a circle priority, (a) is a top view, (b) is a front view, (c) is a right view. . It is a ready-made pile which made the pile head of this invention into an octagon shape, and is the type which made the adjustment part of a circle priority long, (a) is a top view, (b) is a front view, (c) is a right view. . The pile head of the present invention is an off-the-shelf pile with an octagonal shape, and the round-preferred adjustment section is shortened. (A) is a plan view, (b) is a front view, and (c) is a right side view. . (A) is an end view taken along the line Q-Q of FIGS. 10 and 11, (b) is an end view taken along the line R1-R2, (c) is an end view taken along the line R2-R2, and (d) is also made of S. (E) is an end view taken along the line TT in FIGS. 12 and 13, (f) is an end view taken along the line U1-U1, and (g) is an end view taken along the line U2-U2. (H) is sectional drawing in the VV line | wire similarly. In the joining structure of this invention, it is the embodiment which fixed the reinforcing bar for connection to the linear side of the ready-made pile which made the pile head hexagonal shape, (a) is a top view, (b) is a front view. In the joining structure of this invention, it is the embodiment which fixed the reinforcing bar for connection to the linear side of the ready-made pile which made the pile head into an octagon shape, (a) is a top view and (b) is a front view. In the joint structure of the present invention, in the embodiment in which the reinforcing bars for connection are fixed to the straight sides of the ready-made pile with the hexagonal shape of the pile head via an attachment jig, (a) is a plan view and (b) is a plan view. It is a front view. In the joint structure of the present invention, in the embodiment in which the reinforcing bars for connection are fixed to the straight sides of the ready-made pile having an octagonal pile head portion via an attachment jig, (a) is a plan view and (b) is a plan view. It is a front view. In the joint structure of the present invention, an embodiment in which a steel beam is fixed to a straight side of a ready-made pile having a hexagonal shape at a pile head portion via a mounting jig, (a) is a cross-sectional view, (b) These are sectional drawings in the WW line of (a). In the joint structure of the present invention, an embodiment in which a steel beam is fixed to a straight side of a ready-made pile having a pile head having an octagonal shape via a mounting jig, (a) is a cross-sectional view, (b) These are sectional drawings in the YY line of (a).

Embodiments of the present invention will be described with reference to the drawings.

1. Configuration of ready-made pile 1

(1) The ready-made pile 1 of the present invention comprises a hollow base 2 having a predetermined length (height) L0 of an outer diameter D0 and a pile head 5 having a length (height) L1. Become. The pile head 5 is a tubular (hollow prismatic) pile head body 6 having a regular hexagonal cross section, and gradually changes from the outer shape (hexagon) of the pile head body 6 to the outer shape (circular shape) of the base 2. It consists of the shape adjustment part 19 from which an external shape changes.
The regular hexagon which is the cross section of the pile head body 6 of the pile head 5 is a size that allows a circle with a diameter D1 (D1 ≧ D0) to be inscribed, and six sides are straight sides 10 and 10 having a length L3. Configure. Therefore, in this case, there are three sets of one set of parallel straight sides 10A, 10A, straight sides 10B, 10B, and straight sides 10C, 10C.

(2) The height of the shape adjustment part 19 of the pile head 5 is L12, and the type which changes gradually with the inclination being “1/4” with respect to 400 mm (L12 is long (FIGS. 1 and 2). ) And a type that changes abruptly to “1/2” (L12 is shorter than that of FIG. 1 by about one half. FIG. 3 and FIG. 4).

(3) There are two types of shapes of the pile head adjusting portion 19.
The first shape (corner-priority type) is that the corners 12 and 12 are gradually rounded downward from the lower edge 8 and regular hexagonal corners 12 and 12 of the pile head body 6 toward the inside (straight side 10 side). This is a corner-priority type that gradually becomes a reduced diameter from both ends of the straight sides 10 and 19 and reaches a circle having a diameter D0 (FIG. 1). In this case, each of the hexagonal side surfaces 9 and 9 including the straight sides 10 and 10 has a shape in which the side surfaces 9a and 9a that are flush with the side surface 9 continue in a downwardly convex planar shape below the lower edge 8. (FIGS. 1B and 1C). In other words, the corners 12 and 12 of the lower edge 8 of the pile head main body 6 are preferentially shaped so as to reach the circular shape of the base portion 2 having the diameter D0. Further, in this shape, there are a type with a long L12 (FIG. 1) and a type with a short L12 (FIGS. 3 and 4), respectively.
In addition, the second shape (round priority type) is the lower edge 8 of the pile head main body 5 and the entire outer periphery of the regular hexagonal shape is directed downward from all sides of the corner 12 and the straight sides 10 and 10. The entire circumference gradually reaches a circle having a diameter D0 while gradually reducing the diameter (FIGS. 9 and 10). That is, the outer shape of a circle (circle) having a diameter D0 of the base portion 2 is given priority and reaches the lower edge 8 of the pile head body 6. Also, in this shape, there are a type with a long L12 (FIG. 9) and a type with a short L12 (FIG. 10), respectively.
Moreover, the shape of the shape adjusting part 19 of the pile head 5 is not limited to the above two types, and the outer peripheral shape including the straight side is between the height L12 at the lower edge 8 of the pile head body 6. If it is gradually deformed into a circle having a diameter D0, other shapes can be used (not shown).

(4) The ready-made pile 1 has a hollow portion 13 having a diameter D01, and the hollow portion 13 has substantially the same shape from the upper edge 7 of the enlarged head 5 to the lower edge 3a of the base 2. In this case, since the lower edge 3a of the base 2 is connected to other ready-made piles located below, it is necessary to have substantially the same shape as the shape of the upper surface of the ready-made pile located below, The hollow portion has no problem even if some irregularities are formed.

(5) Further, a steel end plate 15 having the same planar shape as the top surface shape of the head expansion 5 is connected to the upper edge 7 of the head expansion 5, and the outer periphery of the end plate 15, the head expansion main body 6 of the head expansion 5. The outer periphery of the upper end (= substantially the same shape as the outer periphery of the end plate 15) is tightly covered with a reinforcing band 16 made of a steel plate, and the outer peripheral surface of the end plate 15 is welded and fixed to the inner surface of the upper end of the reinforcing band 16 ( Figure 2).
Similarly, a steel end plate 15a having the same plane shape as the lower surface of the base 2 is connected to the lower edge 3a of the base 2, and the outer periphery of the lower end of the base 2 (= end plate) at the outer periphery of the end plate 15a. The outer peripheral surface of the end plate 15a is welded and fixed to the inner surface of the lower end of the reinforcing band 16a (FIG. 2).

(6) The ready-made pile 1 having the above-described structure is made of sufficiently compacted concrete, and if necessary, a reinforcing steel cage and a PC steel rod introduced with stress are arranged in the concrete (not shown). Reinforcing bar cages are pile structural reinforcing bars arranged in an annular shape within the thickness of the ready-made pile 1 (between outer circumference D0 and inner circumference D00) in the axial direction, and reinforcing reinforcing bars spirally wound around the pile structural reinforcing bars. ,Configure. Moreover, a pile structure reinforcement and PC steel bar can also be used together.

(7) The ready-made pile 1 having the above structure is manufactured by centrifugal molding. That is, the end plates 15 and 15a and the reinforcing bands 16 and 16a, which are formed in the formwork (not shown) to match the outer shape of the ready-made pile 1 and are integrally welded and fixed on the surface side in advance. Include. Before and after this, a rebar cage made of necessary pile structural rebar, spiral rebar, etc. is placed in the formwork. Moreover, it replaces with a reinforcing steel cage or arranges a PC steel rod between both end plates with a reinforcing steel cage. In this case, it is desirable to arrange the pile structure reinforcing bars of the reinforcing bar parallel to the straight sides.
Subsequently, concrete (mortar) is filled in the mold, and before and after this, when a PC steel rod is used, stress is introduced, the mold is rotated around its axis, and then it is centrifugally molded. . After concrete is solidified, it is demolded, and after predetermined curing, a ready-made pile is completed.
If concrete with high strength is used and sufficiently compacted by centrifugal molding, a ready-made pile 1 having a compressive strength of about 60 to 160 N / mm ² can be formed.

(8) Here, for example,
Pile head 5 height L1 = 2000 mm
Pile head body 6 height (length) L11 = 1600mm
Pile head adjustment part 19 height (length) L12 = 400 mm
Length L3 = 600 mm of the straight side 10 of the pile head body 6
Outer diameter D0 of base 2 = 1000 mm
Inner diameter D00 of base 2 (head expansion 5) = 740 mm
Base height (length) L0 = 5000mm
Form with.
In addition, each dimension shown here is an example, can be changed and implemented suitably. In particular, the length L0 of the base 2 in the axial direction, the length L12 of the shape adjusting portion 19, and the length L11 of the pile head main body 6 can be appropriately expanded and contracted. In this case, the ratio of each dimension is also adjusted appropriately. it can.

(9) In the above description, the reinforcing band 16 covers only the upper end portion of the side surface 9 of the head expansion main body 6, but it can also cover the entire side surfaces 9 and 9 of the head expansion main body 6 (not shown).
Further, the reinforcing bands 16 and 16a may be omitted, and so-called SC piles (not shown) in which the entire outer surfaces of the base portion 2 and the enlarged head portion 5 are covered with a steel material may be used. In this case, a reinforcing bar and a PC steel bar are generally omitted.

(10) Moreover, in the above, although the cross-sectional shape (namely, planar shape) of the pile head main body 6 was a regular hexagon (FIGS. 1-4, FIGS. 9-11), it can also be a regular octagon ( 5 to 8, 12, and 13).

2. Embedding of ready-made pile 1 (joint structure of foundation pile 25 and ground structure) No fixture 40

(1) This ready-made pile 1 is used in the same manner as a normal ready-made pile. A pile hole 21 having a diameter corresponding to the maximum dimension of the pile head body 6 is excavated from the ground 22 and buried in the pile hole 21 while sequentially connecting the other ready-made piles 1A and 1A. Embedding is completed in a state where 1 is connected, and a foundation pile 25 is configured (FIG. 2A). Moreover, the shape of the pile hole 21 is arbitrary as long as the ready-made piles 1 and 2 can be embedded, and the pile head 21 is excavated to a small diameter corresponding to the diameter of the base 2 at the depth where the base 2 of the ready-made pile 1 is located. The pile hole can be excavated with a large diameter corresponding to the pile head 5 (the pile head main body 6 or the pile head main body 6 and the shape adjusting portion 19) (not shown). ).
At this time, the pile hole 21 is excavated and descended into the pile hole 21 while connecting the ready-made piles 1A and 1A sequentially from below, and the upper end of the second ready-made pile 1A from the bottom is located near the ground 22 (pile hole The lower end of the ready-made pile 1 (the lower end 3a of the base portion 2) is placed at the upper end of the second ready-made pile 1A from the bottom. Then, in accordance with the lattice direction of the structural rebar of the plane lattice of the footing, the direction of the preset linear sides 10A and 10A is made to coincide with any one of the lattice directions (axial direction of the structural rebar).
As it is, all the ready-made piles 1, 1 </ b> A, 1 </ b> A connected including the ready-made pile 1 are buried in the pile hole 21 to a predetermined depth. During this time, it is possible to bury the ready-made pile while rotating, but in the state where the burying is completed, the direction of the straight sides 10A, 10B is the lattice direction of the structural reinforcing bar in the plane lattice shape of the footing, and either lattice Match the direction (axial direction of the structural rebar).

(2) Once the ready-made piles 1, 1A, 1A have been buried in all the pile holes 21, according to the structure of the relevant footing, if necessary, dig a hole and use it for the footing (the footing foundation beam (Not shown).

(3) In addition, before and after constructing the footing formwork of (2), the connecting reinforcing bars 27, 27 are connected to the necessary straight sides 10A, 10A, etc., with the enlarged head 5 of the hexagonal prefabricated pile 1. Are arranged vertically, and the lower ends of the connecting reinforcing bars 27 are fixed by welding to the surfaces of the end plate 15 and the reinforcing band 16 (not shown).
In this case, the linear sides 10A and 10A are arranged in parallel to the structural reinforcing bar 31 among the structural reinforcing bars 31 and 32 of the footings that are in a lattice form and orthogonal to each other in plan view. If the connecting reinforcing bars 27, 27 are arranged in parallel with the straight sides 10A, 10A at a predetermined interval, the structural reinforcing bars 31, 31 and the connecting reinforcing bars 27, 27 can be easily fixed without bending (FIG. 15).
Further, if the connecting reinforcing bars 27a and 27a fixed to the other straight sides 10B and 10C are arranged with the interval adjusted in accordance with the positions of the structural reinforcing bars 32 and 32, the structural reinforcing bars 31 or the structural reinforcing bars are not bent. 32 can be fixed. In this case, the connecting reinforcing bars 27a and 27a fixed to the linear sides 10B and 10C are arranged at a predetermined interval, and the side surfaces 9 and 9 corresponding to the linear sides 10B and 10C are flat surfaces. This makes it easy to position and weld.
Subsequently, if other necessary reinforcing bars are arranged and concrete is placed, a footing integrated with the foundation pile 25 (the ready-made pile 1) can be constructed.
In this case, normally, even if the structural reinforcing bars 31 and 32 are arranged after fixing the lower ends of the connecting reinforcing bars 27 and 27 to the straight sides 10A and 10A, the structural reinforcing bars 31 and 32 are arranged conversely. It is also possible to fix the lower ends of the connecting reinforcing bars 27, 27 to the straight sides 10A, 10A later. The procedure for fixing the lower ends of the connecting reinforcing bars 27a and 27a to the straight sides 10B and 10C is the same.

(4) Also, in the case of the octagonal foundation pile 1, a footing integrated with the foundation pile 25 (the ready-made pile 1) can be constructed in the same manner as (3) (FIG. 16).
In this case, since the straight sides 10A and 10A parallel to each other and the straight sides 10C and 10C parallel to each other are orthogonal to each other, if the straight sides 10A and 10A are arranged in parallel to the structural reinforcing bars 31 and 31, straight lines The side portions 10C and 10C are arranged in parallel with the structural reinforcing bars 32 and 32. Accordingly, the connecting reinforcing bars 27, 27 fixed to the straight sides 10A, 10C can be arranged at equal intervals, which is preferable.
In addition, the arrangement | positioning of the connecting reinforcing bars 27a and 27a to the linear sides 10B and 10D is arrange | positioned according to the position of the structural reinforcing bars 31 and 32, and the lower end part of the connecting reinforcing bars 27a is fixed to the linear sides 10B and 10D. To do.
The order of the steps of fixing the connecting reinforcing bars 27 and 27a to the straight sides 10A, 10B, 10C and 10D and arranging the connecting reinforcing bars 31 and 32 is arbitrary as in the case of the hexagon. is there.

3. Embedding ready-made pile 1 (joint structure of foundation pile 25 and ground structure) using fixture 40 hexagon

(1) As in the case without the mounting jig 40, the foundation pile 25 is configured by placing all the ready-made piles (regular hexagons) 1 in the pile hole 21 and burying all the ready-made piles. Then, the straight sides 10A and 10A of the ready-made pile 1 are made to coincide with one of the lattice directions of the footing (the axial direction of the structural reinforcing bar).

(2) The mounting jig 40 is configured by arranging the first joint plate 41 and the second joint plate in an L shape in a cross section (plan view) so as to be at a right angle. The second bonding plate 42 is formed to be slightly wider in cross section (plan view) than the first bonding plate 41. The joining surface (outer surface) 41a of the first joining plate 41 and the joining surface (outer surface) 42a of the second joining plate 42 are formed at right angles.
In the mounting jig 40, the straight sides 10B, 10B, 10C, and the like so that the joining surface 41a (outer surface) of the first joining plate 41 is parallel to the straight side 10A (preferably flush with the straight side 10A). If fixed to 10C, the joining surface (outer surface) 42a of the second joining plate 42 of each joining jig 40 is orthogonal to the linear side 10A. Therefore, the pile head of the ready-made pile 1 has a side of “the straight side 10A and the joining surfaces 42a and 42a of the joining jig 40” and a side of “the joining surfaces 42a and 42a of the other joining jig 40”. A plan view shape such as squares orthogonal to each other is obtained (FIG. 17A). Moreover, since the lower part of each joining jig 40 and 40 is fixed to the side surfaces 9 and 9 of the pile head 5, the upper part of each joining jig 40 and 40 protrudes upwards from the upper surface 7 of the pile head 5. .
Therefore, in this state, the straight side 10 </ b> A and the joining surfaces 42 a and 42 a of the joining jig 40 are arranged in parallel with either of the structural reinforcing bars 31 and 32. Connecting rebars 27 and 27 are equally spaced on the side of “the straight side 10A and the joining surfaces 42a and 42a of the joining jig 40” and the side of “the joining surfaces 42a and 42a of the other joining jig 40”, respectively. If it arrange | positions and the lower end part of the connecting reinforcing bars 27 and 27 is fixed to the linear side 10A or the joint surface 42a, the structural reinforcing bars 31 and 32 and the connecting reinforcing bars 27 and 27 can be fixed easily without bending.
Subsequently, by placing other necessary reinforcing bars and placing concrete, a footing integrated with the foundation pile 25 (the ready-made pile 1) can be constructed (FIG. 17).
Moreover, the planar view shape of the joining jig 40 is not limited to a square, and various shapes can be employed according to the joining with the ground structure (not shown).

(3) Further, in the above (2), the footing structural rebars 31 and 32 are fixed to the pile head 5 of the ready-made pile 1, but the footing steel beams 33 and 35 are fixed to the pile head 5 of the ready-made pile 1. It can also be done (FIG. 19). The mounting jig 40 has the same structure as the mounting jig 40 of (2) above. Further, the steel beam 33 used in this embodiment is an H-shaped steel in which the upper and lower sides of the web 34 are sandwiched between the flanges 34a and 34a. Similarly, the steel beams 35 and 35 are also formed on the upper and lower sides of the web 36 with the flange 36a, H-shaped steel sandwiched between 36a.
If the mounting jig 40 is fixed to the linear sides 10B, 10B, 10C, and 10C so that the joining surface 41a (outer surface) of the first joining plate 41 is flush with the linear side 10A, each joining jig 40 is provided. The joining surface (outer surface) 42 a of the second joining plate 42 is orthogonal to the linear side 10 </ b> A and the joining surface 41. Therefore, the pile head of the ready-made pile 1 has a side of “the straight side 10A and the joining surfaces 42a and 42a of the joining jig 40” and a side of “the joining surfaces 42a and 42a of the other joining jig 40”. A planar view shape such as squares orthogonal to each other is obtained (FIG. 19A). Moreover, since the lower part of each joining jig 40 and 40 is fixed to the side surfaces 9 and 9 of the pile head 5, the upper part of each joining jig 40 and 40 protrudes upwards from the upper surface 7 of the pile head 5. .
In this state, a steel beam 33 passing through the center of the ready-made pile 1 (and parallel to the straight side 10 </ b> A) is disposed above the upper surface 7 of the pile head 5 of the ready-made pile 1. Steel beams 35, 35 arranged on a line passing through the center of the ready-made pile 1 (and a line orthogonal to the central axis of the steel beam 33) are attached to both sides. In this state, the first joining plate 41 of the joining jig 40 adjacent to the web 36 of the steel beam 35 is joined by the L-shaped joining members 37A and 37A having an L shape in plan view. Similarly, the web 34 of the steel beam 33 and the second joining plate 42 of the joining jig 40 adjacent to each other are joined by the L-shaped joining members 37B and 37B having an L shape in plan view.
With the above, since the steel beams 33, 35, 35 are connected to the pile head 5 of the ready-made pile 1, if other necessary reinforcing bars are arranged and concrete is placed, the foundation pile 25 (the ready-made pile 1 ) And an integral footing can be constructed (FIG. 19). At this time, the straight side 10 </ b> A and the joining surfaces 42 a and 42 a of the joining jig 40 are arranged in parallel with either of the structural reinforcing bars 31 and 32. Connecting rebars 27 and 27 are equally spaced on the side of “the straight side 10A and the joining surfaces 42a and 42a of the joining jig 40” and the side of “the joining surfaces 42a and 42a of the other joining jig 40”, respectively. If it arrange | positions and the lower end part of the connecting reinforcing bars 27 and 27 is fixed to the linear side 10A or the joint surface 42a, the structural reinforcing bars 31 and 32 and the connecting reinforcing bars 27 and 27 can be fixed easily without bending.
Subsequently, by placing other necessary reinforcing bars and placing concrete, a footing integrated with the foundation pile 25 (the ready-made pile 1) can be constructed (FIG. 17).

4). Embedding ready-made pile 1 (joint structure of foundation pile 25 and ground structure) using fixture 40 octagon

(1) As in the case without the mounting jig 40, the foundation pile 25 is constructed by placing all the ready-made piles (regular octagon) 1 in the pile hole 21 and burying all the ready-made piles. The straight sides 10A, 10A of the ready-made pile 1 are arranged in parallel with the footing structural rebar 31 and the straight sides 10C, 10C are arranged in parallel with the structural rebar 32, 32.

(2) The mounting jig 40 is configured by arranging the first joint plate 41 and the second joint plate in an L shape in a cross section (plan view) so as to be at a right angle. The first joining plate 41 and the second joining plate 42 are formed in the same cross section (plan view). The joining surface (outer surface) 41a of the first joining plate 41 and the joining surface (outer surface) 42a of the second joining plate 42 are formed at right angles.
In the mounting jig 40, the straight sides 10B, 10B, 10D, and the like so that the joint surface 41a (outer surface) of the first joint plate 41 is parallel to the straight side 10A (preferably flush with the straight side 10A). If fixed to 10D, the joining surface (outer surface) 42a of the second joining plate 42 of each joining jig 40 is arranged parallel to the straight side 10C (if possible, flush with the straight side 10A). Therefore, the pile heads of the ready-made pile 1 are the sides of “the straight side 10A and the joining surfaces 41a and 41a of the joining jig 40” and “the joint surfaces 42a and 42a of the straight side 10C and the other joining jig 40”. ”Is a plan view shape like a square in which the sides are orthogonal to each other (FIG. 18A). Moreover, since the lower part of each joining jig 40 and 40 is fixed to the side surfaces 9 and 9 of the pile head 5, the upper part of each joining jig 40 and 40 protrudes upwards from the upper surface 7 of the pile head 5. .
Therefore, in this state, the side of “the straight side 10A and the joining surfaces 41a and 41a of the joining jig 40” and the structural reinforcing bar 31 are parallel to each other, “the joining side 42a of the linear side 10C and the other joining jig 40, The side 42a "and the structural reinforcing bar 32 are arranged in parallel. Reinforcing bars 27 for connecting to the sides of “the straight side 10A and the joining surfaces 41a and 41a of the joining jig 40” and the “the straight side 10C and the joining surfaces 42a and 42a of the other joining jig 40”, If the 27 is arranged at equal intervals and the lower ends of the connecting reinforcing bars 27, 27 are fixed to the straight sides 10A, 10C or the joint surfaces 41a, 42a, the structural reinforcing bars 31, 32 and the connecting reinforcing bars 27, 27 are Can be easily fixed without bending.
Subsequently, by placing other necessary reinforcing bars and placing concrete, a footing integrated with the foundation pile 25 (the ready-made pile 1) can be constructed (FIG. 18).

(3) Further, in the above (2), the footing structural rebars 31 and 32 are fixed to the pile head 5 of the ready-made pile 1, but the footing steel beams 33 and 35 are fixed to the pile head 5 of the ready-made pile 1. (FIG. 20). The mounting jig 40 has the same structure as the mounting jig 40 of (2) above. Further, the steel beam 33 used in this embodiment is an H-shaped steel in which the upper and lower sides of the web 34 are sandwiched between the flanges 34a and 34a. Similarly, the steel beams 35 and 35 are also formed on the upper and lower sides of the web 36 with the flange 36a, H-shaped steel sandwiched between 36a.
In the mounting jig 40, the bonding surface 41a (outer surface) of the first bonding plate 41 is flush with the linear side 10A, and the bonding surface 42a (outer surface) of the second bonding plate 42 is the linear side 10C. If fixed to the straight sides 10B, 10B, 10D, and 10D so as to be flush with each other, the pile head of the ready-made pile 1 is the side of the “joint surfaces 41a and 41a of the straight side 10A and the joining jig 40”. Then, the “straight side 1C and the sides of the joining surfaces 42a, 42a of the other joining jigs 40” are in a plan view shape like a square in which they are orthogonal to each other (FIG. 20A). Moreover, since the lower part of each joining jig 40 and 40 is fixed to the side surfaces 9 and 9 of the pile head 5, the upper part of each joining jig 40 and 40 protrudes upwards from the upper surface 7 of the pile head 5. .
In this state, a steel beam 33 passing through the center of the ready-made pile 1 (and parallel to the straight side 10C) is disposed above the upper surface 7 of the pile head 5 of the ready-made pile 1, and the steel beam 33 Steel beams 35, 35 arranged on a line passing through the center of the ready-made pile 1 (and a line orthogonal to the central axis of the steel beam 33) are attached to both sides.
In this state, the first joining plate 41 of the joining jig 40 adjacent to the web 36 of the steel beam 35 is joined by the L-shaped joining members 37A and 37A having an L shape in plan view. Similarly, the web 34 of the steel beam 33 and the second joining plate 42 of the joining jig 40 adjacent to each other are joined by the L-shaped joining members 37B and 37B having an L shape in plan view.
With the above, since the steel beams 33, 35, 35 are connected to the pile head 5 of the ready-made pile 1, if other necessary reinforcing bars are arranged and concrete is placed, the foundation pile 25 (the ready-made pile 1 ) And an integral footing can be constructed (FIG. 20).

1 Ready-made pile 1A Ready-made pile (lower pile)
2 Base (shaft) of ready-made piles
3 Base upper edge 3a Base lower edge 5 Pile head of ready-made pile 6 Pile top body of pile head 7 Upper edge of pile head body Lower edge 9, 9a of pile head body Side surface of pile head body 10, 10A, 10B, 10C, 10D Pile head main body straight side (side)
DESCRIPTION OF SYMBOLS 12 Pile head part corner 13 Pile head hollow part 15, 15a End plate 16, 16a Reinforcement band 19 Pile head shape adjustment part 21 Pile hole 22 Ground 25 Foundation pile 27, 27a Connecting rebar 31, 32 Structural rebar (footing rebar)
33 Steel beam (footing)
34 Steel beam web 34a Steel beam flange 35 Steel beam (footing)
36 Steel beam web 36a Steel beam flange 37 L-shaped joining member 40 Mounting jig 41 First joining plate 41a of the attaching jig First joining plate 42 of the joining jig Second joining plate 42a of the attaching jig Second Joining surface of joining plate

Claims (3)

A foundation pile formed by embedding a prefabricated pile into the pile hole, a joint structure and the footing of the ground structure, the out of ready-made pile, the pile head of the already made pile you located on the top, the ground structure Connected to the footing of the object , the joint structure of the foundation pile and the ground structure configured as follows.
(1) prefabricated pile located at the top forms an integral shape by forming a pile head above the base, the base may be joined to "other ready-made pile located below" the lower edge structure The pile head is formed in a prismatic shape .
(2) The pile head has a transverse cross section, has at least one linear side on the outer periphery, and a plurality of connecting rebars arranged in the vertical direction are arranged, and a lower end portion of the connecting rebar is disposed on the pile head. fixed.
(3) In the footing, lattice-like footing structure reinforcing bars are arranged in plan view, and the linear sides are arranged in parallel with one axial direction of the footing structure reinforcing bars.
(4) and the upper portion of the connecting reinforcing bar is fixed to the footing structure rebar.
(5) An attachment jig was fixed to the side face of the pile head .
(6) The mounting jig includes a first joint portion having a joint surface on the outer surface and a second joint portion having a joint surface on the outer surface, and the first joint portion and the second joint portion are connected to the pile head. The joint surface of the second joint portion was orthogonal to the straight side of the pile head. A foundation pile formed by embedding a prefabricated pile into the pile hole, a joint structure and the footing of the ground structure, the out of ready-made pile, the pile head of the already made pile you located on the top, the ground structure junction structure between and connected to the footing, constructed the group Ishizuekui and the ground structure as in the following ones.
(1) prefabricated pile located at the top forms an integral shape by forming a pile head above the base, the base may be joined to "other ready-made pile located below" the lower edge structure The pile head is formed in a prismatic shape .
(2) The pile head has a cross-sectional side and at least two straight sides including parallel sides.
(3) A mounting jig was fixed to the side surface of the pile head.
(4) The mounting jig includes a first joint portion having a joint surface on the outer surface and a second joint portion having a joint surface on the outer surface, and the first joint portion and the second joint portion are connected to the pile head. The joint surface of the second joint portion was orthogonal to the straight side of the pile head.
(5) An end surface of one steel beam of the ground structure disposed in the footing is fixed to a side surface corresponding to the linear side, and the other steel beam of the ground structure is fixed to the second joint portion. It was fixed to the joint surface. Joining structure between the foundation pile and the ground structure according to the structure in claim 1 or claim 2 characterized by as follows.
(1) the mounting jig, first a pair and first joint having a joint surface to be the side surface flush including straight sides response, the joint surface perpendicular to the side surface including the corresponding straight edges a second connecting portion, and configured to have.

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