JP2018017098A - Concrete pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete pile, the flexural capacity and shear capacity of which become greater than ever.SOLUTION: A concrete pile comprises a cylindrical pile body part that contains concrete and that has a hollow part, and a membrane that is arranged in the hollow part of the pile body part to partition at least a part of a volume-variable liquid filling chamber. The liquid filling chamber is filled with a liquid so that the membrane can be brought into contact with an inner peripheral surface of the pile body part.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to concrete piles.

  Ready-made concrete piles generally have a hollow cylindrical shape. Some concrete piles are called concrete piles with outer shell steel pipes (SC piles). SC piles contain concrete and have a cylindrical pile body part having a hollow part and an outer peripheral surface of the pile body part. It is comprised by the outer shell steel pipe to cover (for example, refer patent document 1).

Japanese Patent No. 5265447

In hollow cylindrical concrete piles, when bending moment or shearing force acts and deforms, the concrete peels off from the inner peripheral surface of the pile body, and the bending strength and shearing strength drop sharply. There is a problem that it is easy. This problem can occur not only with normal concrete piles but also with SC piles.
In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a concrete pile having improved bending strength and shear strength compared to the conventional one.

(1) A concrete pile according to at least one embodiment of the present invention is:
A cylindrical pile body including concrete and having a hollow portion;
A membrane that is disposed in a hollow portion of the pile main body portion and partitions at least a part of the volume-filled liquid filling chamber;
When the liquid filling chamber is filled with liquid, the film can contact the inner peripheral surface of the pile main body.

  According to the configuration (1), the film that partitions at least a part of the liquid filling chamber filled with the liquid is in contact with the inner peripheral surface of the pile main body. For this reason, when a bending moment and a shearing force act on a pile main-body part and a pile main-body part deform | transforms, it is suppressed by a film | membrane that a part of pile main-body part peels from the internal peripheral surface of a pile main-body part. . As a result, according to the configuration (1), the bending strength and the shear strength can be improved as compared with the conventional case.

(2) In some embodiments, in the configuration (1),
The membrane is constituted by a part of a bag.

  According to the configuration (2), the membrane is constituted by a part of the bag, and the liquid filling chamber can be constituted by the bag. For this reason, according to the said structure (2), a bending strength and a shear strength can be improved rather than before with a simple structure.

(3) In some embodiments, in the configuration (2),
A pair of ring-shaped end plates respectively attached to both ends of the pile body part;
A communication pipe extending between the pair of end plates through the hollow portion of the pile main body,
A partition member that closes an opening between an inner edge of the end plate attached to one end of the pile body portion and an outer peripheral surface of the communication pipe;
Further comprising
The said bag is arrange | positioned in the space between the outer peripheral surface of the said communicating pipe, and the inner peripheral surface of the said pile main-body part.

  According to the configuration (3), when the concrete pile is submerged from the partition member side into the pile hole in which the soil cement is accumulated, the partition member prevents the soil cement from flowing into the hollow portion through the communication pipe. Soil cement can flow upwards. For this reason, even if the soil cement accumulates in the pile hole, the hollow portion of the pile main body is prevented from being filled with the soil cement. As a result, after the concrete pile is submerged in the pile hole, the liquid filling chamber can be filled with liquid, and the membrane can be brought into contact with the inner peripheral surface of the pile main body.

(4) In some embodiments, in the configuration (3),
The bag is made of a stretchable material,
The apparatus further includes a pressing member that at least partially blocks an opening between an inner edge of the end plate attached to the other end of the pile main body and an outer peripheral surface of the communication pipe.

  According to the said structure (4), even if a bag is comprised with the material which has a stretching property, it is prevented that a bag protrudes from an end plate by the partition member and pressing member which are located in the both ends of a concrete pile.

(5) In some embodiments, in the configuration (3) or (4),
The communication pipe passes through the center of the hollow portion,
The bag has a hole through which the communication pipe is inserted, and can be expanded into a tube shape so as to surround the communication pipe by filling the liquid filling chamber with liquid.

  According to the said structure (5), since the communicating pipe is arrange | positioned in the center of a hollow part in the radial direction of a pile main-body part, it is not obstructed by a communicating pipe, and extends over the circumferential direction whole region of a pile main-body part. The membrane which comprises a part of bag can be made to contact with the inner peripheral surface of a pile main-body part.

(6) In some embodiments, in any one of the configurations (2) to (5),
Comprising a plurality of said bags,
Each of the plurality of bags is provided with a connecting means for connecting the plurality of bags to each other.
The connecting means can connect the plurality of bags while allowing the liquid filling chambers of the plurality of bags to communicate with each other.

  According to said structure (6), by connecting a some bag with a connection means, only the required length in the axial direction of a pile main-body part arrange | positions a bag inside a pile main-body part, A film constituting a part of the bag can be brought into contact with the inner peripheral surface.

(7) In some embodiments, in the configuration (6),
The connecting means includes
A first connecting portion provided on one of the mutually connected bags;
A second connecting portion provided on the other bag of the bags connected to each other;
Including
The first connecting part is
A hollow cylindrical first cylindrical portion;
A first flange part integrally provided at one end of the first cylindrical part and attached to an opening edge of the one bag;
A male screw portion integrally provided on the outer peripheral surface of the first cylindrical portion;
Have
The second connecting part is
A hollow cylindrical second cylindrical portion;
A second flange part integrally provided at one end of the second cylindrical part and attached to the opening edge of the other bag;
A female screw part integrally provided on the inner peripheral surface of the second cylindrical part, and capable of being screwed with the male screw part;
Have
The first cylindrical portion extends from the first flange toward the outside of the one bag,
The second cylindrical portion extends from the second flange portion toward the inside of the other bag.

  According to the said structure (7), the 1st cylindrical part of a 1st connection part is extended toward the outer side of a bag from a 1st collar part, and the 2nd cylindrical part of a 2nd connection part is a bag inner side from a 2nd collar part. When the male screw part of the first connecting part and the female screw part of the second connecting part are screwed together, the first hook part of the first connecting part and the second hook part of the second connecting part are The gap between the two can be reduced. That is, when two bags are connected, the gap between the two bags can be reduced. For this reason, even when using a some bag, the film | membrane which comprises a part of bag can be made to contact without gap with respect to the internal peripheral surface of a pile main-body part.

(8) In some embodiments, in the configuration (1),
A pair of ring-shaped end plates respectively attached to both ends of the pile body part;
A communication pipe extending between the pair of end plates through the center of the hollow portion of the pile main body,
A pair of collar portions attached to both ends of the communication pipe, and closing an opening between the inner edge of the end plate and the outer peripheral surface of the communication pipe;
Further comprising
The film extends between the pair of collar portions,
The liquid filling chamber is defined by the pair of collar portions, the communication pipe, and the membrane.

According to the configuration (8), when the concrete pile is submerged in the pile hole in which the soil cement is accumulated, the soil cement is moved upward through the communication pipe while preventing the soil cement from flowing into the hollow portion by the collar portion. It can flow toward. For this reason, even if the soil cement accumulates in the pile hole, the hollow portion of the pile main body is prevented from being filled with the soil cement. As a result, after the concrete pile is submerged in the pile hole, the liquid filling chamber can be filled with liquid, and the membrane can be brought into contact with the inner peripheral surface of the pile main body.
In addition, since the communication pipe is arranged in the center of the hollow part in the radial direction of the pile body part, the inner circumference of the pile body part is not obstructed by the communication pipe and extends in the entire circumferential direction of the pile body part. The membrane can be brought into contact with the surface.

  According to at least one embodiment of the present invention, a concrete pile having improved bending strength and shear strength than before is provided.

It is a schematic longitudinal cross-sectional view of the concrete pile with an outer shell steel pipe concerning a 1st embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1. It is a perspective view which shows roughly the bag applicable to the concrete pile with an outer shell steel pipe of FIG. It is a schematic longitudinal cross-sectional view of the concrete pile with a shell steel pipe which concerns on 2nd Embodiment of this invention. FIG. 5 is a schematic cross-sectional view taken along the line VV in FIG. 4. It is a longitudinal cross-sectional view which shows roughly the concrete pile with an outer shell steel pipe concerning 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows roughly the concrete pile with an outer shell steel pipe concerning 4th Embodiment of this invention. FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. 7. It is a perspective view which shows roughly the bag applicable to the concrete pile with an outer shell steel pipe of FIG. It is a perspective view which shows schematically the bag applicable to the concrete pile with an outer shell steel pipe concerning a 5th embodiment of the present invention. It is a longitudinal cross-sectional view which shows roughly the concrete pile with an outer shell steel pipe concerning 6th Embodiment of this invention. FIG. 12 is a schematic cross-sectional view taken along line XII-XII in FIG. 11. It is a perspective view which shows roughly the container which has a film | membrane applicable to the concrete pile with an outer shell steel pipe of FIG. It is a schematic longitudinal cross-sectional view of the prestressed concrete pile concerning 7th Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

[First Embodiment]
FIG. 1 is a longitudinal sectional view schematically showing a configuration of a concrete pile with an outer shell steel pipe (hereinafter also referred to as SC pile) 1a according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective view schematically showing a bag 3a applied to the SC pile 1a.

As shown in FIG. 1, the SC pile 1a has the pile main-body part 5, the outer shell steel pipe 7, a pair of end plate 9, and the bag 3a.
The pile body 5 is made of concrete. The pile body part 5 has a cylindrical shape and has a hollow part 11 extending in the axial direction. The hollow portion 11 is a cylindrical cavity and penetrates the pile main body portion 5.

  The outer shell steel pipe 7 has a cylindrical shape and covers the outer peripheral surface of the pile body 5. The outer shell steel pipe 7 is made of a metal, for example, a general structural rolled steel material. The outer shell steel pipe 7 has an outer diameter of, for example, 300 mm or more and 1500 mm or less, and the outer diameter of the outer shell steel pipe 7 corresponds to the outer diameter of the SC pile 1a. Moreover, the outer shell steel pipe 7 has a thickness of 4.5 mm or more and 25 mm or less, for example.

  Each of the pair of end plates 9 has a ring shape and covers both end faces of the pile body 5. However, the end plate 9 has an opening continuous with the hollow portion 11, and the hollow portion 11 is not covered with the end plate 9. The end plate 9 is made of metal, and is made of, for example, general structural rolled steel. The pair of end plates 9 are welded to both ends of the outer shell steel pipe 7, respectively.

The bag 3 a is disposed in the hollow portion 11 of the pile body 5 and is in contact with the inner peripheral surface 13 of the pile body 5.
More specifically, the bag 3a defines a variable volume liquid filling chamber 15 filled with a liquid, preferably water. The bag 3 a expands by being filled with a liquid inside itself, that is, the liquid filling chamber 15, and is in contact with the inner peripheral surface 13 of the pile body 5. That is, the bag 3a has a deformable membrane 17a that is in contact with the inner peripheral surface 13 of the pile body 5 by filling the liquid filling chamber 15 with the liquid as a part of the bag 3a. The bag 3a is made of, for example, a non-stretchable waterproof material such as a waterproof cloth, and the bag 3a is filled with a liquid having an atmospheric pressure, preferably higher than the atmospheric pressure.
The bag 3 a is provided with an inlet 19 for filling with liquid, and the inlet 19 can be closed by a lid 21. Further, when the bag 3a is made of a non-stretchable material, the bag 3a before liquid filling has a slack so that the volume of the liquid filling chamber 15 can be expanded by filling the liquid.

  According to the SC pile 1 a of the first embodiment described above, the film 17 a that partitions at least a part of the liquid filling chamber 15 filled with the liquid is in contact with the inner peripheral surface 13 of the pile body 5. For this reason, when a bending moment or shearing force acts on the pile main body 5 and the pile main body 5 is deformed, a part of the pile main body 5 is peeled off from the inner peripheral surface 13 of the pile main body 5 by the membrane 17a. Is suppressed. As a result, according to the SC pile 1a of the first embodiment described above, the bending strength and the shear strength can be improved as compared with the conventional case.

  And in the SC pile 1a of 1st Embodiment, as a preferable aspect, the film | membrane 17a is comprised by a part of bag 3a, and the liquid filling chamber 15 can be comprised by the bag 3a. For this reason, according to the said structure, a bending strength and a shear strength can be improved rather than before by simple structure.

[Second Embodiment]
FIG. 4 is a longitudinal sectional view schematically showing the configuration of the SC pile 1b according to the second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG.
In the description after the second embodiment, the configuration different from the preceding embodiment will be mainly described, and the configuration having the same or similar shape or function as the configuration described in the preceding embodiment will be described in the figure. The same reference numerals are attached and explanations are omitted or simplified.

As shown in FIGS. 4 and 5, the SC pile 1 b further includes a communication pipe 23 and a partition member 25 when compared with the SC pile 1 a.
The communication pipe 23 extends between the pair of end plates 9 and 9 through the hollow portion 11 of the pile body 5. The communication pipe 23 is made of, for example, metal or resin.
The partition member 25 is disposed so as to block the opening between the inner edge of the end plate 9 attached to one end of the pile body 5 and the outer peripheral surface of the communication pipe 23. The partition member 25 is made of, for example, metal or resin.
And in the hollow part 11, the bag 3a is arrange | positioned in the space between the outer peripheral surface of the communicating pipe 23, and the inner peripheral surface 13 of the pile main-body part 5. FIG.

  According to the SC pile 1b of the second embodiment described above, the soil cement flows into the hollow portion 11 by the partition member 25 when the SC pile 1b is submerged from the partition member 25 side into the pile hole in which the soil cement is accumulated. While preventing this, the soil cement can flow upward through the communication pipe 23. For this reason, even if the soil cement accumulates in the pile hole, the hollow portion 11 of the pile main body portion 5 is prevented from being filled with the soil cement. As a result, after the SC pile 1b is submerged in the pile hole, the liquid filling chamber 15 can be filled with the liquid, and the film 17a can be brought into contact with the inner peripheral surface 13 of the pile main body 5.

[Third Embodiment]
FIG. 6 is a longitudinal sectional view schematically showing the configuration of the SC pile 1c according to the third embodiment of the present invention.
The SC pile 1c is different from the SC pile 1b in that the bag 3b is made of a stretchable material and further includes a pressing member 27.
The bag 3b is made of, for example, rubber, and the pressing member 27 at least partially blocks the opening between the inner edge of the end plate 9 attached to the other end of the pile body 5 and the outer peripheral surface of the communication pipe 23. Yes. The pressing member 27 is made of, for example, metal or resin.

According to the above-described configuration, even if the bag 3b is made of a stretchable material, the bag 3b is separated from the openings of the end plates 9 and 9 by the partition members 25 and the pressing members 27 located at both ends of the SC pile 1c. Protruding is prevented.
Therefore, when the liquid filling chamber is filled with a liquid having a pressure higher than the atmospheric pressure, the bag 3b can be prevented from expanding and the pressure from escaping. Can be brought into contact with each other at high pressure.

[Fourth Embodiment]
FIG. 7 is a longitudinal sectional view schematically showing the configuration of the SC pile 1d according to the fourth embodiment of the present invention. FIG. 8 is a schematic cross-sectional view along the line VIII-VIII in FIG. FIG. 9 is a perspective view schematically showing a bag 3c applied to the SC pile 1d.

  The SC pile 1d is different from the SC pile 1b in that the communication tube 23 passes through the center of the hollow portion 11 in the radial direction of the pile body 5 and the bag 3c has a hole 29 through which the communication tube 23 is inserted. ing. The bag 3c is inflatable into a tube shape so as to surround the communication pipe 23 by filling the liquid filling chamber 15 that is partitioned by the bag 3c, and the membrane 17c constituting a part of the bag 3c is a pile body. The inner peripheral surface 13 of the part 5 can be contacted.

According to the SC pile 1d of the fourth embodiment described above, the communication pipe 23 is arranged in the center of the hollow portion 11, so that it is not obstructed by the communication pipe 23 and extends over the entire circumferential direction of the pile main body 5. Thus, the membrane 17 c constituting a part of the bag 3 c can be brought into contact with the inner peripheral surface 13 of the pile body 5.
The bag 3c is provided with an inlet 19 and a lid 21 so as to avoid the hole 29.

[Fifth Embodiment]
FIG. 10 is a cross-sectional view schematically showing a plurality of bags 3d, 3d applicable to the SC pile according to the fifth embodiment of the present invention.
Each of the plurality of bags 3d, 3d has a connecting means for connecting the plurality of bags 3d, 3d to each other. The connecting means can connect the plurality of bags 3d and 3d while allowing the liquid filling chambers 15 and 15 of the plurality of bags 3d and 3d to communicate with each other.

  According to the SC pile of 5th Embodiment mentioned above, only the required length in the axial direction of the pile main-body part 5 is made inside the pile main-body part 5 by connecting several bags 3d and 3d by a connection means. The bags 3d and 3d can be arranged, and the membranes 17d and 17d constituting a part of the bags 3d and 3d can be brought into contact with the inner peripheral surface 13 of the pile body 5.

Preferably, the connecting means includes a first connecting part 31 and a second connecting part 33.
The 1st connection part 31 is provided in one bag 3d among the bags 3d and 3d mutually connected.
The 2nd connection part 33 is provided in the other bag 3d among the bags 3d and 3d connected mutually.

The first connecting portion 31 includes a first cylindrical portion 35, a first flange portion 37, and a male screw portion 39.
The first cylindrical portion 35 has a hollow cylindrical shape. The first collar portion 37 is provided integrally with one end of the first cylindrical portion 35, and is liquid-tightly attached to the opening edge of one bag 3d. The male screw portion 39 is integrally provided on the outer peripheral surface of the first cylindrical portion 35.

The second connecting portion 33 includes a second cylindrical portion 41, a second flange portion 43, and a female screw portion 45.
The second cylindrical portion 41 has a hollow cylindrical shape and has an inner diameter larger than the outer diameter of the first cylindrical portion 35. The 2nd collar part 43 is integrally provided in the end of the 2nd cylindrical part 41, and is attached liquid-tightly to the opening edge of the other bag 3d. The female screw portion 45 is integrally provided on the inner peripheral surface of the second cylindrical portion 41 and can be screwed with the male screw portion 39 of the first connecting portion 31.
And the 1st cylindrical part 35 is extended toward the outside of one bag 3d from the 1st collar part 37,
The second cylindrical portion 41 extends from the second flange portion 43 toward the inside of the other bag 3d.

  According to the above configuration, the first cylindrical portion 35 of the first connecting portion 31 extends from the first flange portion 37 toward the outside of the bag 3d, and the second cylindrical portion 41 of the second connecting portion 33 is the second flange portion 43. Since the inner thread portion 39 of the first connecting portion 31 and the inner thread portion 45 of the second connecting portion 33 are screwed together, the first flange portion 37 of the first connecting portion 31 is extended. And a gap between the second connecting portion 33 and the second flange portion 43 can be reduced. That is, when the two bags 3d and 3d are connected, the gap between the two bags 3d and 3d can be reduced. For this reason, even when a plurality of bags 3d, 3d are used, the membranes 17d, 17d constituting a part of the bags 3d, 3d can be brought into contact with the inner peripheral surface 13 of the pile body 5 without any gap.

  Preferably, each bag 3 d has a first connecting portion 31 and a second connecting portion 33. In this case, when the SC pile is installed in the pile hole, any one of the first connecting portion 31 and the second connecting portion 33 may be positioned upward in each bag 3d. Of the first connecting part 31 and the second connecting part 33, the one located at the top can be used as the injection port 19 and is closed by the lid 21. On the other hand, among the first connecting portion 31 and the second connecting portion 33, the lowermost one is closed by the plug 47.

Preferably, in each bag 3d, a check valve 49 is provided on one of the first connecting portion 31 and the second connecting portion 33. The check valve 49 allows the liquid to be injected into the liquid filling chamber 15 through the first connecting portion 31 or the second connecting portion 33 and restricts the outflow of the liquid from the liquid filling chamber 15.
According to the above configuration, the check valve 49 can prevent the liquid from leaking out after injecting the high-pressure liquid into the liquid filling chamber 15.
In addition, the length of the bags 3d and 3d connected to each other in the axial direction of the pile body 5 may be the same or different. Further, the number of bags 3d connected to each other is not limited to two, and may be three or more.

[Sixth Embodiment]
FIG. 11: is a longitudinal cross-sectional view which shows roughly the structure of the SC pile 1e which concerns on 6th Embodiment of this invention. 12 is a schematic cross-sectional view taken along line XII-XII in FIG. FIG. 13 is a perspective view schematically showing a container 51 having a film 17e applied to the SC pile 1e.

The SC pile 1e is different from the SC pile 1a in that it has a variable volume container 51 instead of the bag 3a.
The container 51 includes a communication pipe 23, a pair of collar portions (ridges) 53, and a membrane 17e.
The pair of collar portions 53 has an annular shape and is fitted to both ends of the communication tube 23. Accordingly, the communication pipe 23 and the collar portions 53, 53 coupled to each other have a bobbin shape. In a state where the container 51 is positioned in the hollow portion 11 of the pile body portion 5, the communication pipe 23 passes between the pair of end plates 9 and 9 through the center of the hollow portion 11 in the radial direction of the pile body portion 5. It extends. The collar portions 53 and 53 block the opening between the inner edge of the end plates 9 and 9 and the outer peripheral surface of the communication pipe 23. For example, the collar portions 53 and 53 are made of metal and are welded to the communication pipe 23 and the end plates 9 and 9.

  The film 17 e extends between the pair of collar portions 53, 53 and surrounds the communication pipe 23. The liquid filling chamber 15 is partitioned by the pair of collar portions 53, 53, the communication pipe 23, and the membrane 17e. The film 17e is fixed by, for example, a non-stretchable waterproof material or a stretchable material, and is formed into a cylindrical shape. Both ends of the film 17e are fixed in a liquid-tight manner to the pair of collar portions 53, 53.

According to the SC pile 1e of the sixth embodiment described above, when the SC pile 1e is submerged in the pile hole in which the soil cement is accumulated, the collar portion 53 prevents the soil cement from flowing into the hollow portion 11. The soil cement can flow upward through the communication pipe 23. For this reason, even if the soil cement accumulates in the pile hole, the hollow portion 11 of the pile main body portion 5 is prevented from being filled with the soil cement. As a result, after the SC pile 1 e is submerged in the pile hole, the liquid filling chamber 15 can be filled with the liquid, and the film 17 e can be brought into contact with the inner peripheral surface 13 of the pile body 5.
Moreover, since the communication pipe 23 is arrange | positioned in the center of the hollow part 11 in the radial direction of the pile main-body part 5, it is piled up over the circumferential direction whole region of the pile main-body part 5 without being inhibited by the communication pipe 23 The film 17 e can be brought into contact with the inner peripheral surface 13 of the main body 5.
For example, the container 51 has a through hole 55 formed in the collar portion 53, and the injection port 19 is attached to the collar portion 53 so as to communicate with the through hole 55.

[Seventh Embodiment]
FIG. 14 is a schematic longitudinal sectional view of a prestressed concrete pile (hereinafter also referred to as PC pile) 1f according to the seventh embodiment. The PC pile 1f is different from the SC pile 1a in that it does not have the outer shell steel pipe 7 but has a plurality of PC steel bars 57 provided between the end plates 9 and 9.
Also in the PC pile 1 f, the bag 3 a is disposed in the hollow portion 11 of the pile body 5 and is in contact with the inner peripheral surface 13 of the pile body 5. For this reason, when a pile moment and a shear force act on the pile main-body part 5, and the pile main-body part 5 deform | transforms, it is suppressed that a part of pile main-body part 5 peels from the internal peripheral surface 13 of the pile main-body part 5. Is done. As a result, according to the PC pile 1f, the bending strength and the shear strength can be improved as compared with the conventional case.
In other words, the present invention is suitable for SC piles, but a cylindrical pile main body having a hollow portion 11 including concrete such as PC pile, high-strength prestressed concrete pile (PHC pile), reinforced concrete pile (RC pile), etc. Applicable to all ready-made concrete piles having 5.

  Finally, the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

1a, 1b, 1c, 1d, 1e Concrete pile with outer steel pipe (SC pile)
1f Prestressed concrete pile (PC pile)
3a, 3b, 3c, 3d Bag 5 Pile main body part 7 Outer steel pipe 9 End plate 11 Hollow part 13 Inner peripheral surface 15 Liquid filling chambers 17a, 17b, 17c, 17d, 17e Membrane 19 Inlet 21 Lid 23 Communication pipe 25 Partition Member 27 holding member 29 hole 31 first connecting portion 33 second connecting portion 35 first cylindrical portion 37 first flange portion 39 male screw portion 41 second cylindrical portion 43 second flange portion 45 female screw portion 47 stopper 49 check valve 51 container 53 Collar portion 55 Through hole 57 PC steel bar

Claims (8)

A cylindrical pile body including concrete and having a hollow portion;
A membrane that is disposed in a hollow portion of the pile main body portion and partitions at least a part of the volume-filled liquid filling chamber;
A concrete pile according to claim 1, wherein the liquid is filled in the liquid filling chamber so that the film can contact the inner peripheral surface of the pile main body. The concrete pile according to claim 1, wherein the film is constituted by a part of a bag. A pair of ring-shaped end plates respectively attached to both ends of the pile body part;
A communication pipe extending between the pair of end plates through the hollow portion of the pile main body,
A partition member that closes an opening between an inner edge of the end plate attached to one end of the pile body portion and an outer peripheral surface of the communication pipe;
Further comprising
The said pile is arrange | positioned in the space between the outer peripheral surface of the said communicating pipe, and the internal peripheral surface of the said pile main-body part, The concrete pile of Claim 2 characterized by the above-mentioned. The bag is made of a stretchable material,
The pressing member according to claim 3, further comprising a pressing member that at least partially closes an opening between an inner edge of the end plate attached to the other end of the pile main body and an outer peripheral surface of the communication pipe. Concrete pile. The communication pipe passes through the center of the hollow portion,
The bag has a hole through which the communication pipe is inserted, and can be expanded into a tube shape so as to surround the communication pipe by filling the liquid filling chamber with liquid. Concrete pile according to 3 or 4. Comprising a plurality of said bags,
Each of the plurality of bags is provided with a connecting means for connecting the plurality of bags to each other.
The concrete pile according to any one of claims 2 to 5, wherein the connecting means is capable of connecting the plurality of bags while allowing the liquid filling chambers of the plurality of bags to communicate with each other. The connecting means includes
A first connecting portion provided on one of the mutually connected bags;
A second connecting portion provided on the other bag of the bags connected to each other;
Including
The first connecting part is
A hollow cylindrical first cylindrical portion;
A first flange part integrally provided at one end of the first cylindrical part and attached to an opening edge of the one bag;
A male screw portion integrally provided on the outer peripheral surface of the first cylindrical portion;
Have
The second connecting part is
A hollow cylindrical second cylindrical portion;
A second flange part integrally provided at one end of the second cylindrical part and attached to the opening edge of the other bag;
A female screw part integrally provided on the inner peripheral surface of the second cylindrical part, and capable of being screwed with the male screw part;
Have
The first cylindrical portion extends from the first flange toward the outside of the one bag,
The concrete pile according to claim 6, wherein the second cylindrical portion extends from the second flange portion toward the inside of the other bag. A pair of ring-shaped end plates respectively attached to both ends of the pile body part;
A communication pipe extending between the pair of end plates through the center of the hollow portion of the pile main body,
A pair of collar portions attached to both ends of the communication pipe, and closing an opening between the inner edge of the end plate and the outer peripheral surface of the communication pipe;
Further comprising
The film extends between the pair of collar portions,
The concrete pile according to claim 1, wherein the liquid filling chamber is partitioned by the pair of collar portions, the communication pipe, and the film.

Images