JP6582578B2 - Pile foundation, hollow ready-made pile with soil cement shielding device and pile foundation construction method - Google Patents

Description

  The present disclosure relates to a soil cement shielding device, a pile foundation, and a pile foundation construction method.

As a method for constructing a pile foundation, there is a cement milk method or the like having a step of inserting a hollow ready-made pile into a hole in which soil cement is accumulated. In such a construction method, soil cement enters the hollow portion of the hollow ready-made pile when inserting the hollow ready-made pile, but the hollow portion of the pile head has a foundation beam, a pile cap, etc. after the hollow ready-made pile is inserted. There is a case to install a reinforcing steel cage for connecting pile heads.
Then, patent document 1 is disclosing the processing method inside the pile head which inserts a pile head plug body in a pile head before insertion of a hollow ready-made pile, and pulls out a pile head plug body after insertion of a hollow ready-made pile. . According to the said processing method, permeation of the soil cement to the hollow part of a pile head can be excluded according to the volume of a pile head plug body.

JP-A-11-131470

  Hollow ready-made piles include various types such as reinforced concrete piles (RC piles), high-strength prestressed concrete piles (PHC piles), high-strength prestressed reinforced concrete piles (PRC piles), and concrete piles with shell steel pipes (SC piles) However, as one measure to increase the bending strength, shear strength and toughness of the ready-made hollow pile, not only the pile head but also the deeper region of the hollow portion should be filled with concrete instead of soil cement. Conceivable.

  However, it is difficult to eliminate the penetration of the soil cement to a deeper region of the hollow portion by a known method. For example, when the pile head plug disclosed in Patent Document 1 is diverted, the pile head plug is elongated in the vertical direction. Since the soil cement penetrates into the gap between the pile head plug body and the inner peripheral surface of the hollow ready-made pile, if the pile head plug body becomes longer in the vertical direction, the pile head plug body cannot be pulled out after the soil cement has hardened. Have difficulty.

  In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a soil cement shielding device that facilitates the injection of concrete into a deeper area than a pile head with respect to the hollow portion of a hollow ready-made pile, and the soil cement. It is providing the pile foundation and pile foundation construction method using a shielding apparatus.

(1) According to at least one embodiment of the present invention, a soil cement shielding device that can be attached to a hollow ready-made pile having a hollow portion,
The flow of the uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion can be inhibited using the particulate matter contained in the uncured soil cement, and the hollow in the hollow portion It has a ventilation part configured to allow gas flow in the axial direction of the ready-made pile.

According to the configuration (1), since the ventilation portion can inhibit the flow of the soil cement by using the particulate matter contained in the soil cement, the hollow ready-made pile is inserted into the soil cement stored in the hole. When doing so, the rise of the soil cement in the hollow portion is suppressed by the soil cement shielding device. As a result, in the hollow portion, a cavity that can be filled with concrete can be easily formed up to a region deeper than the pile head.
On the other hand, when a hollow part is airtightly divided, the gas in a hollow part cannot be discharge | released but it becomes difficult to insert a hollow ready-made pile by buoyancy. In this respect, according to the above configuration (1), the ventilation portion allows the passage of gas, so that gas is prevented from being accumulated in a region below the ventilation portion. For this reason, generation | occurrence | production of a buoyancy is suppressed and a hollow ready-made pile can be easily inserted in the soil cement stored in the hole.

(2) In some embodiments, in the configuration (1), the ventilation portion is configured by a partition plate having at least one ventilation hole.
According to the said structure (2), gas is allowed to pass by suppressing a raise of the soil cement in a hollow part by simple structure by comprising a ventilation part with the partition plate which has at least 1 ventilation hole. be able to.

(3) In some embodiments, in the configuration (1), the ventilation portion is configured by a mesh-like body.
According to the said structure (3), gas can be passed by suppressing a raise of the soil cement in a hollow part by a simple structure by comprising a ventilation | gas_flowing part with a mesh-like body.

(4) Pile foundation according to at least one embodiment of the present invention,
At least one hollow ready-made pile having a hollow portion;
A soil cement shielding device attached to the at least one hollow ready-made pile,
The soil cement shielding device is capable of inhibiting the flow of uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion by using particulate matter contained in the uncured soil cement, and A ventilation portion configured to allow gas flow in the axial direction of the hollow ready-made pile in the hollow portion;
Concrete is filled in the region of the hollow portion located above the ventilation portion.

According to the configuration (4), since the concrete is filled above the ventilation portion, the hollow ready-made pile has a large bending strength, a large shear strength, and a high toughness. For this reason, the pile foundation can support the superstructure stably even if earthquakes repeatedly occur, for example.
On the other hand, according to the above configuration (4), since the ventilation portion can inhibit the flow of the soil cement by using the particulate matter contained in the soil cement, the hollow ready-made pile is put into the soil cement stored in the hole. When inserting the soil cement, the soil cement shielding device suppresses the rise of the soil cement in the hollow portion. As a result, in the hollow portion, a cavity that can be filled with concrete can be easily formed up to a region deeper than the pile head.
On the other hand, when the hollow part is partitioned in an airtight manner, the gas in the hollow part cannot be released, and it becomes difficult to insert the hollow ready-made pile by buoyancy. In this respect, according to the above configuration (4), the ventilation portion allows the passage of gas, so that gas is prevented from being accumulated in a region below the ventilation portion. For this reason, generation | occurrence | production of a buoyancy is suppressed and a hollow ready-made pile can be easily inserted in the soil cement stored in the hole.

(5) A method for constructing a pile foundation according to at least one embodiment of the present invention,
A step of preparing at least one soil cement shielding device that can be attached to at least one hollow ready-made pile having a hollow portion, the flow of uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion Ventilation portion configured to allow the flow of gas in the axial direction of the hollow ready-made pile in the hollow portion, and can be inhibited using the particulate matter contained in the uncured soil cement Providing at least one soil cement shielding device having:
A step of attaching one of the soil cement shielding devices to a position spaced from a pile head of the at least one hollow ready-made pile with respect to at least one hollow ready-made pile having a hollow portion;
A pile insertion step of inserting the at least one hollow ready-made pile attached with the soil cement shielding device into a hole in which uncured soil cement is stored;
And a concrete placing step of pouring concrete into the region of the hollow portion located above the ventilation portion.

According to the configuration (5), since the ventilation portion can inhibit the flow of the soil cement by using the particulate matter contained in the soil cement, the hollow ready-made pile is inserted into the soil cement stored in the hole. When doing so, the rise of the soil cement in the hollow portion is suppressed by the soil cement shielding device. As a result, in the hollow portion, a cavity that can be filled with concrete can be easily formed up to a region deeper than the pile head.
On the other hand, when a hollow part is airtightly divided, the gas in a hollow part cannot be discharge | released but it becomes difficult to insert a hollow ready-made pile by buoyancy. In this respect, according to the above configuration (5), the ventilation portion allows gas to pass therethrough, so that gas is prevented from being accumulated in a region below the ventilation portion. For this reason, generation | occurrence | production of a buoyancy is suppressed and a hollow ready-made pile can be easily inserted in the soil cement stored in the hole.

(6) In some embodiments, in the configuration (5),
Prior to the pile insertion step, attaching the other soil cement shielding device to the pile head with respect to the at least one hollow ready-made pile;
The step of removing the other soil cement shielding device from the pile head after the pile head is submerged in the uncured soil cement by the pile insertion step and before the concrete placing step And further comprising.

According to the above configuration (6), by attaching the other soil cement shielding apparatus pile head, pile head in hollow prefabricated pile insertion step be sunk into Soirusemen the bets, two soil cement shielding device A cavity can be easily formed therebetween.

  According to at least one embodiment of the present invention, a soil cement shielding device that facilitates the injection of concrete into a deeper area than a pile head with respect to a hollow portion of a hollow ready-made pile, and a pile foundation using the soil cement shielding device And a pile foundation construction method is provided.

It is a figure showing a schematic structure of a structure which has a pile foundation concerning one embodiment of the present invention. It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on one Embodiment of this invention, (a) is sectional drawing which shows a soil cement shielding apparatus with the one end part of a hollow ready-made pile, b) is a plan view schematically showing a soil cement shielding device. It is a figure for demonstrating the structure of the soil-cement shielding apparatus which concerns on other one Embodiment of this invention, (a) is equivalent to Fig.2 (a), (b) is equivalent to FIG.2 (b). . It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on other one Embodiment of this invention, and is a figure corresponded to Fig.2 (a). It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on other one Embodiment of this invention, and is a figure corresponded to Fig.2 (a). It is a figure for demonstrating the structure of the soil-cement shielding apparatus which concerns on other one Embodiment of this invention, (a) is equivalent to Fig.2 (a), (b) is equivalent to FIG.2 (b). . It is a figure for demonstrating the structure of the soil-cement shielding apparatus which concerns on other one Embodiment of this invention, (a) is equivalent to Fig.2 (a), (b) is equivalent to FIG.2 (b). . It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on other one Embodiment of this invention, and is a figure corresponded to Fig.2 (a). It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on other one Embodiment of this invention, and is a figure corresponded to Fig.2 (a). It is a figure for demonstrating the structure of the soil-cement shielding apparatus which concerns on other one Embodiment of this invention, (a) is equivalent to Fig.2 (a), (b) is equivalent to FIG.2 (b). . It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on other one Embodiment of this invention, and is a figure which shows the upper end part vicinity of the hollow ready-made pile 2 (2a). It is a figure for demonstrating the structure of the soil cement shielding apparatus which concerns on other one Embodiment of this invention, and is equipped with two soil cement shielding apparatuses with the both ends of one hollow ready-made pile, and the one end part of the adjacent hollow ready-made pile. It is sectional drawing shown roughly. It is a flowchart for demonstrating the schematic procedure of the pile foundation construction method which concerns on one Embodiment of this invention. It is a figure for demonstrating the process included in the procedure of FIG. It is a flowchart for demonstrating the schematic procedure of the pile foundation construction method which concerns on other one Embodiment of this invention. It is a figure for demonstrating the process included in the procedure of FIG.

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.

FIG. 1 is a diagram illustrating a schematic configuration of the structure 1. The structure 1 has a plurality of hollow ready-made piles 2, an upper structure 3 supported by the hollow ready-made piles 2, a pile cap 4a and a foundation beam 4b that connect the hollow ready-made pile 2 and the upper structure 3.
The plurality of hollow ready-made piles 2 are, for example, arranged in a vertical direction to form a row, and the rows constituted by the plurality of hollow ready-made piles 2 are arranged in parallel apart from each other in the horizontal direction. In each row, the hollow ready-made piles 2 are connected to each other by a pile joint (not shown).

  And in each row | line, the soil cement shielding apparatus 10 which concerns on embodiment of this invention is provided in the position spaced apart from the lower end of the hollow ready-made pile (upper pile) 2a arrange | positioned at the uppermost side, ie, a pile head. And the at least 1 hollow ready-made pile 2 and the soil cement shielding apparatus 10 comprise the pile foundation 12 which concerns on embodiment of this invention.

  2 to 12 schematically show a soil cement shielding device 10 (10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i, 10j) according to an embodiment of the present invention together with the end of the hollow ready-made pile 2. FIG. 2A, FIG. 3A, FIG. 4, FIG. 5, FIG. 6A, FIG. 7A, FIG. 8, FIG. 9, FIG. 10A, FIG. 12 is a longitudinal sectional view, and FIGS. 2B, 3B, 6B, 7B, and 10B are plan views.

The soil cement shielding device 10 has a ventilation part 14 as shown in FIGS. The ventilation part 14 can inhibit the flow of the uncured soil cement in the axial direction of the hollow ready-made pile 2 in the hollow part 16 of the hollow ready-made pile 2 using the particulate matter contained in the unhardened soil cement. And it is comprised so that the flow of the gas in the axial direction of the hollow ready-made pile 2 in the hollow part 16, specifically, the flow of air may be permitted.
In addition, that the ventilation | gas_flowing part 14 uses a granular material means producing clogging with a granular material and inhibiting the flow of soil cement. Therefore, a small amount of soil cement or a cement component contained in the soil cement may pass through the ventilation portion 14 until clogging occurs.

Hereinafter, a pile foundation construction method will be described as a method of using the soil cement shielding device 10.
FIG.13 and FIG.15 is a flowchart which respectively shows the schematic procedure of the pile foundation construction method which concerns on embodiment of this invention, FIG.14 and FIG.16 shows the process of the pile foundation construction method of FIG.13 and FIG.15. It is a figure for demonstrating each.
As shown in FIGS. 13 and 15, the pile foundation construction method includes a shielding device preparation step S10, a shielding device attachment step (first shielding device attachment step) S12, a pile insertion step S14, and a reinforcing bar arrangement step S16. And concrete placing step S18.

In the shielding device preparation step S10, at least one soil cement shielding device 10 is prepared.
In the shielding device attaching step S <b> 12, at least one soil cement shielding device 10 is attached to at least one hollow ready-made pile 2 having the hollow portion 16. In this embodiment, as shown to Fig.14 (a) and FIG.16 (a), the one soil cement shielding apparatus 10 is attached to the position spaced apart from the pile head 18, for example to the lower end of the upper pile 2a. .

  In the pile insertion step S14, as shown in FIGS. 14 (a) and 16 (a), a hollow ready-made product in which the soil cement shielding device 10 is installed in the hole 22 in which the uncured soil cement 20 is stored. The pile 2 is inserted. At this time, the soil cement shielding device 10 at the lower end of the upper pile 2 a is inserted below the surface of the soil cement 20.

In the reinforcing bar arrangement step S16, as shown in FIGS. 14 (b) and 16 (c), the reinforcing bar 23 is arranged in the hollow portion 16 of the hollow ready-made pile 2.
In addition, as a pile head joining method, when adopting the padding reinforcement method, the reinforcing bar cage 23 is arranged in the reinforcing bar arrangement step S16, but when adopting other methods such as a main bar fixing method and an embedding method. The reinforcing bar arranging step S16 is not essential.
In the concrete placing step S <b> 18, as shown in FIG. 14C, concrete is poured into the hollow portion 16 of the hollow ready-made pile 2 and around the pile head portion 18 of the hollow ready-made pile 2. As the concrete hardens, a pile cap 4a and a foundation beam 4b constituted by the concrete 24 are formed.

  According to the pile foundation construction method using the soil cement shielding device 10 illustrated in FIG. 14 or FIG. 16, the hollow 24 of the upper pile 2 a is filled with the concrete 24, and the hollow ready-made pile 2 filled with the concrete 24 is , Has large bending strength, large shear strength and high toughness. For this reason, the pile foundation 12 constructed | assembled using the soil cement shielding apparatus 10 can support the upper structure 3 stably, for example, even if an earthquake repeatedly occurs.

  On the other hand, according to the pile foundation construction method using the soil cement shielding device 10, the ventilation portion 14 of the soil cement shielding device 10 can inhibit the flow of the soil cement 20 by using the particulate matter contained in the soil cement 20. It is. For this reason, when the hollow ready-made pile 2 is inserted into the soil cement 20 stored in the hole 22, the soil cement shielding device 10 suppresses the rise of the soil cement 20 in the hollow portion 16. As a result, in the hollow portion 16, a cavity that can be filled with the concrete 24 can be easily formed up to a region deeper than the pile head portion 18.

  On the other hand, when the hollow portion 16 is partitioned in an airtight manner, the gas in the hollow portion 16 cannot be released, and it becomes difficult to insert the hollow ready-made pile 2 by buoyancy. In this respect, according to the pile foundation construction method using the soil cement shielding device 10, since the ventilation portion 14 allows the passage of gas, it is possible to prevent gas from accumulating in a region below the ventilation portion 14. For this reason, generation | occurrence | production of a buoyancy is suppressed and the hollow ready-made pile 2 can be easily inserted in the soil cement 20 collected by the hole 22. FIG.

  In some embodiments, the pile foundation construction method using the soil cement shielding device 10 is a shielding device attaching step of attaching one soil cement shielding device (first soil cement shielding device) 10 as shown in FIG. (First shielding device attaching step) Separately from S12, a shielding device attaching step (second shielding device attaching step) S20 for attaching another soil cement shielding device (second soil cement shielding device) 10 and a second soil cement shielding. A second shielding device removing step S22 for removing the device 10 is further provided.

  The second shielding device attachment step S20 is performed before the pile insertion step S14, and the second soil cement shielding device 10 is provided on the pile head 18 with respect to at least one hollow ready-made pile 2, that is, on the upper end of the upper pile 2a. Is attached. And in pile insertion process S14, until the hollow ready-made pile 2 to which the 2nd soil cement shielding apparatus 10 was attached was shown to Fig.16 (a), the pile head 18 will sink in the unhardened soil cement 20. FIG. It is inserted into the hole 22.

In the second shielding device removing step S22, as shown in FIG. 16 (b), the hardened soil cement around the pile head 18 is removed by lifting, and the second soil cement shielding device 10 is removed from the pile head 18. Removed. And after removing the 2nd soil cement shielding apparatus 10, as shown in FIG.16 (c), reinforcing bar arrangement | positioning process S16 is performed.
And concrete placement process S18 is performed after reinforcing bar arrangement process S16, and concrete 24 is filled into the upper part of hollow part 16 and hole 22 of upper pile 2a, as shown in Drawing 16 (d).
In addition, when the reinforcing bar arrangement step S16 is not necessary, the second shielding device removal step S22 may be executed before the concrete placing step S18.

  In the pile foundation construction method illustrated in FIG. 16, the pile head 18, that is, the pile head 18 is uncured in the pile insertion step S <b> 14 by attaching the second soil cement shielding device 10 to the upper end of the upper pile 2 a. Even if it sinks into the cement 20, the soil cement 20 is prevented from flowing into the hollow portion 16 from above. For this reason, a cavity can be easily formed between the two soil cement shielding devices 10.

In some embodiments, as shown in FIGS. 2 to 5, the ventilation portion 14 is constituted by a partition plate 28 having at least one ventilation hole 26. The partition plate 28 is made of metal, for example.
According to this configuration, the ventilation portion 14 is configured by the partition plate 28 having at least one ventilation hole 26, thereby suppressing the rise of the soil cement 20 in the hollow portion 16 with a simple configuration, Can be passed.

  In some embodiments, the vent 26 has a diameter of 1 mm or more and less than 50 mm. In this configuration, since the vent hole 26 has a diameter of 1 mm or more and less than 50 mm, the vent hole 26 can inhibit the flow of the soil cement 20 while utilizing the particulate matter in the soil cement 20, and the flow of gas. Can be tolerated.

  In some embodiments, the vent 26 has a diameter of 5 mm or more and less than 10 mm. In this configuration, since the air holes 26 have a diameter of 5 mm or more and less than 50 mm, the air holes 26 can more reliably inhibit the flow of the soil cement 20 while utilizing the particulate matter in the soil cement 20, and The gas flow can be allowed more reliably.

In some embodiments, as shown in FIGS. 2, 4, and 5, the partition plate 28 has one vent hole 26. In some embodiments, the partition plate 28 has two or more vent holes 26, as shown in FIG. That is, the number of vent holes 26 may be one or more.
In addition, the position of the vent hole 26 is not particularly limited, and may be arranged at the center in the radial direction of the hollow ready-made pile 2 or may be arranged away from the center. When the plurality of vent holes 26 are formed, the arrangement pattern of the plurality of vent holes 26 is not particularly limited.

  In some embodiments, as shown in FIGS. 2 and 3, the partition plate 28 is configured by an end plate 30 that constitutes a part of the hollow ready-made pile 2. Accordingly, the fact that the soil cement shielding device 10 can be attached to the hollow ready-made pile 2 includes the case where the soil cement shielding device 10 is attached to the hollow ready-made pile 2 without being removable. Moreover, attaching the soil cement shielding device 10 to the hollow ready-made pile 2 includes attaching the soil cement shielding device 10 integrally when the soil cement shielding device 10 is manufactured.

In some embodiments, the partition plate 28 is fixed to the end plate 30 of the hollow ready-made pile 2 by welding as shown in FIG. In addition, the code | symbol 32 in FIG. 4 has shown the welding part.
In some embodiments, although not shown, the partition plate 28 is fixed to the end plate 30 of the hollow ready-made pile 2 with an adhesive.
In some embodiments, the partition plate 28 is fixed to the end plate 30 of the hollow ready-made pile 2 with bolts as shown in FIG. According to this structure, the soil cement shielding apparatus 10d can be retrofitted easily with a volt | bolt. Moreover, according to this structure, when removing the soil cement shielding apparatus 10d, it can remove easily.

In some embodiments, the vent 14 is constituted by a mesh 34 as shown in FIGS. The net-like body 34 has a net-like skeleton and gaps (communication holes) formed by the skeleton, and the flow of the soil cement 20 is performed using the contact between the particulate matter contained in the soil cement 20 and the skeleton. Allow gas flow while suppressing.
As the mesh-like body 34, for example, a wire mesh, a punching metal, an expanded metal, a nonwoven fabric, a woven fabric, a resin sponge, a resin sheet in which a plurality of holes are formed, or the like can be used.

  In some embodiments, the mesh body 34 has an opening of 0.05 mm or more and 0.5 mm or less. In this structure, since it has a mesh opening of 0.05 mm or more and 0.5 mm or less, the mesh-like body 34 can inhibit the flow of the soil cement 20 while using the particulate matter in the soil cement 20, and gas. Can be allowed to flow.

In some embodiments, the mesh body 34 has an opening of 0.05 mm or more and 0.15 mm or less.
In this configuration, since the mesh body 34 has an opening of 0.05 mm or more and 0.15 mm or less, it is possible to reliably inhibit the flow of the soil cement 20 while using the particulate matter in the soil cement 20, and The gas flow can be reliably allowed.

  In some embodiments, as shown in FIGS. 6 and 8, the mesh body 34 is fixed to the end plate 30 of the hollow ready-made pile 2 by an adhesive 36. According to this configuration, the network 34 can be easily fixed by using the adhesive 36.

  In some embodiments, as shown in FIGS. 7 and 9 to 12, the mesh body 34 is in a state in which a part of the mesh body 34 is sandwiched between the pressing plate 38 and the end plate 30. Held in. The pressing plate 38 is fixed to the end plate 30 by, for example, bolts. According to this configuration, the mesh body 34 can be reliably held by sandwiching a part of the mesh body 34 between the pressing plate 38 and the end plate 30.

  In some embodiments, as shown in FIGS. 6 to 9 and 12, the end plate 30 is supported from the inner peripheral edge of the cylindrical concrete 40 of the hollow ready-made pile 2 to support the mesh body 34. Also has a support portion 42 extending radially inward. The support portion 42 is formed with one or more communication holes 44 that are covered with the mesh body 34.

In some embodiments, the retainer plate 38 has an annular shape as shown in FIGS. 7 and 9-12. However, the shape of the pressing plate 38 is not limited to an annular shape, and the pressing plate 38 only needs to have at least one opening 46 that exposes at least a part of the mesh-like body 34.
In some embodiments, although not shown, the metal mesh 34 is fixed to the end plate 30 by welding.

In some embodiments, as shown in FIG. 9, the ventilation portion 14 is configured by a stack of a plurality of mesh-like bodies 34 having different openings. According to this configuration, by laminating a plurality of mesh bodies 34 having different openings, it is possible to reliably inhibit the flow of the soil cement 20 while using the particulate matter in the soil cement 20, and The flow can be reliably allowed.
In some embodiments, a mesh body 34 having a relatively small mesh opening is disposed on the upstream side in the flow direction of the soil cement 20, and a mesh body 34 having a relatively large mesh opening is disposed on the downstream side. Is done.

  In some embodiments, as shown in FIG. 10, a support portion 42 for supporting the mesh body 34 is provided separately from the end plate 30, and the support portion 42 has one or more communication holes. It is comprised by the board which has 44. In this case, the support part 42 can be fixed to the end plate 30 by bolts or welding.

In some embodiments, as shown in FIG. 11, a support portion 42 for supporting the mesh body 34 is provided separately from the end plate 30, and the support portion 42 constitutes the ventilation portion 14. The mesh body 34 has a mesh opening larger than that of the mesh body 34. Specifically, a metal mesh with a small mesh constitutes the ventilation part 14, and a metal mesh with a large mesh constitutes the support part 42. The mesh-like body 34 for constituting the support part has an opening of about 20 mm, for example.
In this configuration, by using the mesh body 34 as the support portion 42, the mesh body 34 constituting the ventilation portion 14 can be supported with a simple configuration.

In some embodiments, the ventilation part 14 is arrange | positioned on the outer side (opposite side to the hollow part 16) of the end plate 30, as shown in FIGS. 4-7 and FIGS. 9-11.
In some embodiments, the ventilation part 14 is arrange | positioned inside the end plate 30 (hollow part 16 side), as shown in FIG.
In some embodiments, although not shown in the figure, the granular material constituting the ventilation portion 14 is held between two mesh bodies 34 as the support portion 42, for example, a wire mesh. In this structure, the flow of the soil cement 20 can be inhibited while using the granular material in the soil cement 20 by the granular material constituting the ventilation portion 14, and the flow of gas can be allowed.

FIG. 12 shows an example of attachment of the first soil cement shielding device 10j and the second soil cement shielding device 10h. 10d or 10i or 10j is used for the second soil cement shielding device 10 (10j is illustrated in FIG. 12), and the first soil cement shielding device 10 is 10a or 10b or 10c or 10d or 10e or 10f or 10g or 10h. (10h is illustrated in FIG. 12).
When 10j, 10d, 10i is used for the second soil cement shielding device 10, the second soil cement shielding device 10j, 10d, 10i is removed from the pile head 18 so that the hollow portion 16 of the hollow ready-made pile 2 is spread over the entire area. The rebar cage 23 can be easily placed in the hollow portion 16 and the concrete 24 can be easily placed.
Moreover, when 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h are used for the first soil cement shielding device 10, the load of the upper structure 3 can be reliably transmitted from the upper pile 2a to the middle pile 2b. it can.

In some embodiments, as shown in FIG. 14, the 1st soil cement shielding apparatus 10 is arrange | positioned 2 m or more away from the upper end of the hollow ready-made pile 2a located in the top. That is, it attaches to the hollow ready-made pile 2 so that the cavity which has the depth D of 2 m or more, for example is formed.
In addition, in FIG. 1, although the 1st soil cement shielding apparatus 10 is being fixed to the lower end part of the hollow ready-made pile 2a located in the top among the pile foundations 12, the fixed position of the 1st soil cement shielding apparatus 10 is The position is not limited to this. For example, the 1st soil cement shielding apparatus 10 may be fixed to the upper end part or lower end part of the hollow ready-made piles 2b and 2c located below the hollow ready-made pile 2a located in the top. Alternatively, the first soil cement shielding device 10 may be fixed to an intermediate portion of any hollow ready-made pile 2.
On the other hand, as shown in FIG. 16, the attachment position of the 2nd soil cement shielding apparatus 10 is always the upper end of the upper pile 2a.

  In some embodiments, as shown in FIG. 1, in the row constituted by a plurality of hollow ready-made piles 2, the upper hollow ready-made pile 2 a is constituted by an SC pile (concrete pile with a shell steel pipe), The hollow ready-made pile 2b is constituted by a PRC pile (high-strength prestressed reinforced concrete pile), and the lower hollow ready-made pile 2c is constituted by a PHC pile (high-strength prestressed concrete pile). The strength against the bending moment is in the order of SC pile> PRC pile> PHC pile.

  In some embodiments, the soil cement shielding device 10 is attached to the SC pile 2 a as the hollow ready-made pile 2. As shown in FIGS. 2 to 11, the SC pile 2 a includes a cylindrical concrete 40, an outer shell steel pipe 48 that covers the outer periphery of the concrete 40, and an end plate 30 that covers the end surface of the concrete 40.

  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.

1 Structure 2 Hollow ready-made pile 2a Upper pile (eg SC pile)
2b Medium pile (eg PRC pile)
2c Lower pile (eg PHC pile)
3 Superstructure 4a Pile cap 4b Foundation beam 10 (10a to 10j) Soil cement shielding device 12 Pile foundation 14 Ventilation part 16 Hollow part 18 Pile head 20 Soil cement 22 Hole 23 Reinforcement basket 24 Concrete 26 Vent hole 28 Partition plate 30 End Plate 32 Welding portion 34 Mesh 36 Adhesive 38 Holding plate 40 Concrete 42 Supporting portion 44 Communication hole 46 Opening 48 Outer shell steel pipe

Claims (8)

At least one hollow ready-made pile having a hollow portion , inserted into a hole in which soil cement is stored ;
A soil cement shielding device attached to the at least one hollow ready-made pile ,
The soil cement shielding device is capable of inhibiting the flow of uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion by using particulate matter contained in the uncured soil cement, and , have a vent configured to permit the flow of gas in the axial direction of the hollow prefabricated pile in the hollow portion,
The vent is provided deeper than the pile head of the at least one hollow ready-made pile,
A pile foundation characterized in that concrete is filled in a region of the hollow portion located above the ventilation portion . The pile foundation according to claim 1, wherein the ventilation portion is constituted by a partition plate having at least one ventilation hole. The pile foundation according to claim 1, wherein said ventilation part is constituted by a mesh-like object. And the sky ready-made piles in that having a hollow portion,
At least one soil cement shielding device mounted in front Symbol in empty prefabricated pile comprises,
The soil cement shielding device is capable of inhibiting the flow of uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion by using particulate matter contained in the uncured soil cement, and A ventilation portion configured to allow gas flow in the axial direction of the hollow ready-made pile in the hollow portion;
The hollow ready-made pile with a soil cement shielding device, wherein the one soil cement shielding device is detachably attached to a position away from a pile head of the hollow ready-made pile . The other soil cement shielding device is removably attached to the pile head.
A hollow ready-made pile with a soil cement shielding device according to claim 4 . A step of preparing at least one soil cement shielding device that can be attached to at least one hollow ready-made pile having a hollow portion, the flow of uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion Ventilation portion configured to allow the flow of gas in the axial direction of the hollow ready-made pile in the hollow portion, and can be inhibited using the particulate matter contained in the uncured soil cement Providing at least one soil cement shielding device having:
A step of attaching one of the soil cement shielding devices to a position spaced from a pile head of the at least one hollow ready-made pile with respect to at least one hollow ready-made pile having a hollow portion;
A pile insertion step of inserting the at least one hollow ready-made pile attached with the soil cement shielding device into a hole in which uncured soil cement is stored;
A concrete placing step for injecting concrete into a region of the hollow portion located above the ventilation portion;
Equipped with a,
The pile foundation construction method , wherein the ventilation portion of the one soil cement shielding device is disposed deeper than a pile head of the at least one hollow ready-made pile .   The pile foundation construction method according to claim 6, wherein the one soil cement shielding device is fixed to a lower end of the at least one hollow ready-made pile. A step of preparing at least one soil cement shielding device that can be attached to at least one hollow ready-made pile having a hollow portion, the flow of uncured soil cement in the axial direction of the hollow ready-made pile in the hollow portion Ventilation portion configured to allow the flow of gas in the axial direction of the hollow ready-made pile in the hollow portion, and can be inhibited using the particulate matter contained in the uncured soil cement Providing at least one soil cement shielding device having:
A step of attaching one of the soil cement shielding devices to a position spaced from a pile head of the at least one hollow ready-made pile with respect to at least one hollow ready-made pile having a hollow portion;
A pile insertion step of inserting the at least one hollow ready-made pile attached with the soil cement shielding device into a hole in which uncured soil cement is stored;
A concrete placing step for injecting concrete into a region of the hollow portion located above the ventilation portion;
Prior to the pile insertion step, attaching the other soil cement shielding device to the pile head with respect to the at least one hollow ready-made pile;
The step of removing the other soil cement shielding device from the pile head after the pile head is submerged in the uncured soil cement by the pile insertion step and before the concrete placing step When,
Pile Foundation Construction how to, characterized in that to obtain Bei the.

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