JP6725313B2 - Base member for pile foundation - Google Patents

Description

The present invention relates to a base member, and more particularly to a base member for a pile foundation, which is a molded product used as one member of a pile foundation and having a plurality of piles inserted therein.

One of the foundations for constructing a structure on the ground surface is a pile foundation for driving a pile into the ground to support the structure. One of the foundation construction methods using a pile foundation is a method called a pin foundation construction method, in which a steel pipe (pin) is driven diagonally to the ground and the structure supports the structure by its supporting force.

In a foundation construction method using a pile foundation such as a pin foundation construction method, as one member of the pile foundation, for example, steel material or precast concrete as disclosed in Japanese Patent Publication No. 2003-526747 (Patent Document 1) is used. A base member through which a plurality of piles are inserted, which is also called a fixed block, is used.

Special table 2003-526747 gazette

Since the structure is supported by the pile in the construction method using such a pile foundation, the strength of the pile foundation that guides and fixes the pile to the ground becomes important.

The base member for a pile foundation according to the present invention is a molded product that is used as one member of a pile foundation and has a plurality of piles inserted therein, and the driving angle of the pile that is driven obliquely with respect to the center line of the base member. A plurality of guide portions having through holes for fixing the plurality of guide portions are arranged along the circumferential direction of the center line, and the axial direction of the first guide portion and the second guide portion of the plurality of guide portions that are adjacent to each other in the circumferential direction. Of the first guide portion and the peripheral wall of the first guide portion are in contact with the second guide portion by an integral connecting portion having a length in the axial direction of the first guide portion. They are connected together in the closed state.
Each of the plurality of guide parts is integrally connected with the peripheral wall in contact with the adjacent guide parts in the circumferential direction by an integral connecting part having a length in the axial direction of the guide part, whereby the base member is connected. Can be integrally formed by casting or the like. Therefore, the strength of the base member can be improved.

Preferably, the length of the guide portion in the direction of the center line is an imaginary line between the center of the guide and the center of each of the two guides adjacent to each other when viewed at right angles to the plane including the center. The length substantially coincides with the centerline direction between the intersections.
As a result, the base member can be downsized, and the workability can be improved by suppressing the amount of excavated soil and the amount of backfilled soil when constructing a pile foundation using the base member.

More preferably, in all of the plurality of guide portions, the adjacent guide portions and the peripheral wall are in contact with each other on the same plane orthogonal to the center line.
As a result, the base member can be made smaller, and the excavation amount of soil and the amount of backfilled soil in constructing a pile foundation using the base member can be suppressed to improve workability.

Preferably, the plurality of guide portions are four guide portions arranged at 90° in the circumferential direction of the central axis.
As a result, the base member is held in good balance by the piles guided by the guide portion. Therefore, the strength balance of the base member can be maintained.

Preferably, there is further arranged a central member having the center line as an axis and integrally connected with the peripheral wall in contact with the peripheral walls of the plurality of guide portions.
Since the base member has the central member, the central member can be exposed to the structure to support the structure.

More preferably, the central member has an inner space into which the support column can be inserted, and the peripheral wall of the central member is provided with one or more through holes extending to the inner space.
Since the through hole is provided in the central member, the bolt can be inserted into the pillar inserted in the central member from the outside of the peripheral wall of the central member. Therefore, the workability of a pile foundation using the base member can be improved.

Preferably, the central member has one end in the axial direction closed by a surface and has an inner space on the back surface side of the surface, and the peripheral wall of the central member has one or more penetrations to the inner space. A hole is provided.
Since the central member is provided with a through hole extending to the inner space on the back surface side of the surface, a tool or the like is inserted into the inner space from the outer side of the peripheral wall of the central member and abutted on the surface of the central member. Work such as bolt tightening can be performed on the structure. Therefore, the workability of a pile foundation using the base member can be improved.

According to this invention, the strength of the base member for the pile foundation can be increased.

It is the perspective view which looked down the base member concerning a 1st embodiment from the slanting upper part. It is the figure which looked at the base member concerning 1st Embodiment from the arrow A direction in FIG. It is the figure which looked at the base member concerning 1st Embodiment from the arrow B direction in FIG. It is a schematic explanatory drawing which shows the pile foundation which used the base member concerning 1st Embodiment as one member, and the structure erected by the said pile foundation. It is a schematic explanatory drawing which shows the pile foundation which used the base member concerning 1st Embodiment as one member, and the structure erected by the said pile foundation. It is a schematic explanatory drawing which shows the procedure which erects a support|pillar using the base member concerning 1st Embodiment as one member of a pile foundation. It is the perspective view which looked down at the base member concerning a 2nd embodiment from the slanting upper part. It is the figure which looked at the base member concerning 2nd Embodiment from the arrow A direction in FIG. It is the figure which looked at the base member concerning a 2nd embodiment from the arrow B direction in FIG. It is a schematic explanatory drawing which shows the pile foundation which used the base member concerning 2nd Embodiment as one member, and the structure erected by the said pile foundation.

Hereinafter, preferred embodiments will be described with reference to the drawings.
The base member 100 according to the embodiment is a member that is used as one member of a pile foundation and into which a plurality of piles are inserted. A pile foundation is used as a foundation structure in a foundation method such as a pin foundation method. The base member 100 according to the first embodiment is referred to as a base member 100A, and the base member 100 according to the second embodiment is referred to as a base member 100B. The base member 100 is represented by the base members 100A and 100B.

[First Embodiment]
[Structure of base member]
1 to 3 are diagrams for explaining the configuration of the base member 100A according to the first embodiment. FIG. 1 is a perspective view of the base member 100A seen from diagonally above, FIG. 2 is a view seen from the direction of arrow A in FIG. 1, and FIG. 3 is a view seen from the direction of arrow B in FIG. The front surface of FIG. 2 is the front surface of the base member 100A, and the front surface of FIG. 3 is the upper surface of the base member 100A.

With reference to FIGS. 1 to 3, a base member 100A according to the first embodiment includes a central member 10 facing a structure and guide portions 20a to 20d. The guide portions 20a to 20d are also representatively referred to as a guide portion 20. The center member 10 of the base member 100A according to the first embodiment fixes the support of the structure.

The axis of the center member 10 coincides with the center line C of the base member 100A. Each of the guide portions 20a to 20d has through holes h1 to h4 for fixing the driving angle of the pile driven by being inclined with respect to the axis C of the central member 10, that is, the center line C of the base member 100A. Piles can be inserted into the through holes h1 to h4, respectively. The base member 100A is installed on the surface of the ground so that the axis centers a1 to a4 of the guide portions 20a to 20d face in the ground, and the pile is driven from above along the guide portion 20, so that the pile is grounded from above. Is guided in a direction inclined with respect to the center line C.

The four guide portions 20 a to 20 d are arranged on the outer peripheral side of the central member 10 in the circumferential direction, that is, along the circumferential direction of the center line C. For example, the four guide portions 20 a to 20 d are arranged at intervals of 90° in the circumferential direction of the central member 10. As a result, the base member 100A is held in good balance by the piles guided by the guide portion 20. Therefore, it is possible to maintain the balance of strength when the base member 100A is used as one member of the pile foundation.

The axial center of each guide portion 20 and the axial center of the guide portions 20 adjacent to each other in the circumferential direction of the central member 10 are in a twisted positional relationship with each other. Specifically, the axial center a1 of the guide portion 20a and the axial center a2 of the guide portions 20b adjacent to each other in the circumferential direction are in a twisted relationship with each other, and the axial center a2 of the guide portion 20b is adjacent to the circumferentially adjacent guides. The axial center a3 of the portion 20c and the axial center a3 of the guide portion 20c are in the positional relationship of twisting with the axial center a4 of the guide portion 20d adjacent in the circumferential direction. The center a4 is in a twisted positional relationship with the shaft center a1 of the guide portions 20a adjacent to each other in the circumferential direction. That is, the four guide portions 20a to 20d are arranged along the circumferential direction of the central member 10 so as to have a positional relationship of being twisted with each other. Thereby, the supporting force in different directions is generated in each of the four guide portions 20a to 20d, and the supporting force of the pile foundation using the base member 100A is improved.

The four guide portions 20a to 20d that are in a positional relationship of being twisted with each other are integrally connected in a state in which the peripheral wall is in contact with an adjacent guide portion 20 by an integral connecting portion 21 having a length in the axial directions a1 to a4, respectively. Has been done. The state of being connected to the adjacent guide parts 20 “having a length in the axial direction” means that the guide parts 20 are connected to the adjacent guide parts 20 only at specified positions such as bolt positions. Not a state, but a state in which a certain length is provided in the axial direction and the sheets are continuously contacted and connected in a planar shape. The state in which the guide portions 20 are “integrally connected” to the adjacent guide portions 20 refers to a state in which the positional relationship between two adjacent guide portions 20 in the connecting portion is fixed and not fixed. .. By configuring the four guide portions 20a to 20d to be integrally connected to the adjacent guide portion 20 by the integral connecting portion 21, the guide portions 20a to 20d can be integrally formed by casting or the like. By integrally molding the four guide portions 20a to 20d by casting or the like, the strength can be improved as compared with the case where they are joined as separate independent members. Further, even a complicated shape can be easily molded.

The state in which the adjacent guide portions 20 are connected “in a state where the peripheral walls are in contact with each other” means that at least one point of the peripheral wall of each of the two adjacent guide portions 20 is in contact, and the contact position is included in the integral connecting portion 21. It refers to the state of being. That is, the two adjacent guide portions 20 have the closest relationship at the position where the peripheral walls are in contact with each other, and the shortest length between the axial centers thereof is equal to the outer diameter of the guide portion 20. Therefore, the size of the entire base member 100A can be reduced. Therefore, in the construction of the pile foundation using the base member 100A as one member by the construction method described later, the excavation amount of soil and the amount of backfilled soil can be suppressed to improve the workability. Moreover, since the weight of the base member 100A is reduced by reducing the size of the base member 100A, the base member 100A can be easily transported.

Preferably, in each of the four guide portions 20a to 20d, the peripheral wall is in contact with the adjacent guide portion 20 on the same plane orthogonal to the centerline C direction. As a result, the base member 100A can be further downsized, and the workability of the pile foundation using the base member 100A as one member can be further improved.

More preferably, the guide portion 20 is also integrally connected to the central member 10 by the integral connecting portion 21, with the peripheral wall being in contact with the peripheral wall of the central member 10. Since the guide portion 20 is also integrally connected to the central member 10, the guide portion 20 and the central member 10, that is, the entire base member 100A can be integrally formed by casting or the like. The strength of the entire base member 100A can be improved by integrally molding the entire base member 100A by casting or the like. Further, even a complicated shape can be easily molded.

With reference to FIG. 2, the length H1 of the guide portion 20 in the direction of the center line C substantially matches the length H2 in FIG. The length H2 is an imaginary line between the axis of the guide 20 and the axes of the two guides 20 adjacent on both sides when the guide 20 is viewed at right angles to the plane including the center line C. It is the length in the direction of the center line C between the intersections. Specifically, with reference to FIG. 2, the length H1 of the guide portion 20a in the direction of the center line C is when the guide portion 20a is viewed at right angles to the plane including the center line C (in the case of FIG. 2), The length H2 in the centerline C direction between the virtual intersections P1 and P2 of the axis a1 of the guide portion 20a and the axes a4 and a2 of the two guide portions 20d and 20b adjacent on both sides is substantially the same. .. By setting the length H1 of the guide portion 20 in the center line C direction in this way, the size of the entire base member 100A can be reduced while ensuring the axial length of the guide portion 20 necessary for guiding the pile. Can be converted.

The length of each guide portion 20 in the axial direction (also referred to as sleeve length) is 100 mm or more, for example. Preferably, the sleeve length of the guide portion 20 is 150 mm. Since the guide portion 20 guides the pile in the axial direction by inserting the pile in each of the through holes h1 to h4, the sleeve length can also be referred to as a guide length. Since the guide length is 100 mm or more, preferably 150 mm or more, even when the base member 100A is used as one member of the pile foundation, a load is applied to the pile inserted in the guide portion 20. The displacement can be reduced.

The center member 10 has an inner pillar that is open at least at the end (hereinafter, this end is also referred to as the upper end and the opposite end is also referred to as the lower end) that is upward when the central member 10 is installed on the ground surface. It has a hollow that can be inserted. As an example, the center member 10 is a hollow cylinder having a through hole h11. At least one through hole for inserting a bolt from the outer peripheral side of the central member 10 into a pillar inserted in the central member 10 at a position on the peripheral wall of the central member 10 where there is no integral connecting portion 21. 11A is provided. For example, four through holes 11A are provided. Preferably, the through hole 11A is provided near the upper end. Since the through hole 11A is provided in the peripheral wall of the central member 10, it is possible to insert and fasten a bolt for fixing the support column from the outside of the peripheral wall of the central member 10. Therefore, even after the base member 100A is installed on the ground surface, the work of fixing the support pillar to the central member 10 can be performed. Therefore, it is not necessary to fix the support pillar to the central member 10 before installing the base member 100A on the ground surface, and the installation work of the base member 100A becomes easy.

The upper end of the central member 10 is located above the upper end of the guide portion 20. Preferably, the upper end of the center member 10 is located above the upper end of the guide portion 20 to the extent that a tool such as a wrench for working the bolt inserted in the through hole 11A can be used. The lower end of the center member 10 is located above the lower end of the guide portion 20 and below the point where the central member 10 is integrally connected to the guide portion 20 by the integral connecting portion 21. By setting the upper end and the lower end of the central member 10 in this manner, the size of the entire base member 100A can be reduced. Therefore, in the construction of the pile foundation using the base member 100A as one member by the construction method described later, the excavation amount of soil and the amount of backfilled soil can be suppressed to improve the workability. Further, since the base member 100A is reduced in weight by being downsized, the base member 100A can be easily transported.

[Construction]
4 and 5 are schematic explanatory views showing a pile foundation using the base member 100A as one member and a structure erected by the pile foundation. The structure is, for example, a mount for a solar panel. 4 is a front view and FIG. 5 is a perspective view.

4 and 5, base member 100A is installed on the ground such that center line C is vertical. The lower end of the column 300A is inserted into the inner space of the center member 10 from the upper end. With the support 300A inserted in the inner space, the bolts 31 are inserted from the outside of the peripheral wall of the central member 10 toward the inner space of the central member 10 through the through holes 11A and tightened. As a result, the column 300A is fixed to the central member 10.

The pile 200 is inserted from the upper end into the inner space of each of the four guide portions 20a to 20d. Since the base member 100A is installed on the surface of the ground, the pile 200 is guided by the guide portion 20 and is driven in the axial direction of the pile 200, that is, the four piles 200 are driven into the ground while maintaining a positional relationship of twisting each other. Be done.

[Procedure for erection of pillars]
FIG. 6 is a schematic explanatory view showing a procedure of vertically installing the support column 300A by using the base member 100A as one member of the pile foundation.
With reference to FIG. 6, first, the builder excavates a hole for installing the base member 100A at the installation location of the support column 300A (FIG. 6A). The base member 100A is installed in the hole with the upper surface thereof facing upward and the direction of the center line C being vertical. Therefore, the hole may have a size that allows the hole from the lower end to the upper end of the base member 100A. As described above, since the base member 100A is downsized, the amount of excavation can be suppressed.

Next, the builder installs the base member 100A in the hole with the upper surface facing upward and the direction of the center line C being vertical (FIG. 6(b)). As described above, the base member 100A is lightweight because it is miniaturized. Therefore, it is possible for the builder to manually carry the column 300A into the installation place and install it in the hole without using a heavy machine such as a crane.

Next, the builder inserts the pile 200 into each of the four guide portions 20a to 20d and drives the pile 200 on the ground (FIG. 6(c)). At this time, the pile 200 can be driven into the ground by hitting the upper end of the pile 200 with an electric tool such as a handy type electric hammer.

The four guide portions 20a to 20d are respectively arranged on the outer peripheral surface of the central member 10 so as to have a twisted positional relationship with the axial center of the guide portions 20 adjacent in the circumferential direction of the central member 10, The piles 200 are driven on the ground along the respective axial directions a1 to a4, so that the supporting forces in the respective axial directions a1 to a4 are generated. Accordingly, the base member 100A can be fixed to the ground so that the base member 100A does not move in the horizontal direction and the vertical direction. That is, it is possible to secure a sufficient supporting force for erecting the column 300A.

Next, the builder inserts the lower end of the support column 300A from the upper end of the center member 10 and fixes it from the outer periphery of the center member 10 with the bolts 31 through the through holes 11 (FIG. 6(d)).

After that, the builder backfills the soil around the base member 100A and rolls it (FIG. 6(e)). As described above, since the base member 100A is downsized and the holes to be excavated are small, the amount of backfill soil can be small. Therefore, the builder can manually backfill without using heavy equipment such as a shovel car.

[Effects of First Embodiment]
As described above, in the base member 100A according to the first embodiment, the guide portions having the through holes h1 to h4 for fixing the driving angle of the pile driven obliquely with respect to the center line C are adjacent to each other. In a state of being in contact with the peripheral wall of the portion 20, they are integrally connected with each other with a length in the axial direction. Therefore, the base member 100A can be integrally formed by casting or the like. Therefore, the strength when the base member 100A is used as one member of the pile foundation can be improved. In addition, since miniaturization can be realized, the amount of excavation and the amount of backfill soil at the time of construction of a pile foundation using the base member 100A as one member of the pile foundation are reduced, and the load on the environment can be reduced. it can.

Further, since the central member 10 having the inner space into which the support column can be inserted is provided with the through hole 11A from the outer periphery to the inner space, the bolt for fixing the support column from the outer peripheral side of the central member 10 is fastened. can do. Therefore, the support can be fixed to the central member 10 even after the base member 100A is installed on the ground surface, and the construction can be facilitated.

[Second Embodiment]
In the second embodiment, the same parts and components as those in the first embodiment are designated by the same reference numerals. Their names and functions are also the same. Therefore, these descriptions will not be repeated.

7 to 9 are diagrams for explaining the configuration of the base member 100B according to the second embodiment. 7 is a perspective view of the base member 100A as viewed from diagonally above, FIG. 8 is a view as seen in the direction of arrow A in FIG. 7, and FIG. 9 is a view as seen in the direction of arrow B in FIG.

With reference to FIGS. 7 to 9, a base member 100B according to the second embodiment has the same structure as the base member 100A according to the first embodiment shown in FIGS. At the upper end of the central member 10, there is a contact surface 12 that can contact the structure.

The contact surface 12 is integrally connected to the upper end of the central member 10. As a result, the base member 100B, including the contact surface 12, can be integrally formed by casting.

The central member 10 of the base member 100B has an inner space at least on the back surface side of the contact surface 12. As an example, the center member 10 has an inner space h21 whose upper end is closed by the contact surface 12 and whose lower end is open. The contact surface 12 is provided with a through hole 13 extending to the inner space. Preferably, the through hole 13 is centered on the intersection of the contact surface 12 and the center line C. The structure contacted with the contact surface 12 is fixed to the contact surface 12 by a bolt inserted through the through hole 13.

One or more through holes (mouths) 11B penetrating to the inner space are provided on the side of the central member 10 and near the upper end. Preferably, the through hole 11B has a size through which a bolting tool such as a spanner or a wrench can pass. Since the through hole 11B is provided in the vicinity of the upper end of the central member 10, a tool is inserted from the outer peripheral side of the central member 10 into the inner space of the central member 10 and abutted through the through hole 13 of the abutting surface 12. A bolt for fixing the structure to the surface 12 can be fastened. Therefore, the structure can be fixed to the contact surface 12 of the central member 10 even after the base member 100B is installed on the ground surface. That is, since it is not necessary to fix the structure to the central member 10 before the base member 100B is installed on the ground surface, the installation work of the base member 100B becomes easy.

In the base member 100B according to the second embodiment, like the base member 100A according to the first embodiment, the contact surface 12 of the central member 10 is brought into contact with the lower end of the column 300A, and the central member 10 is The support 300A may be supported. Alternatively, as shown in FIG. 10, the base material 300B may be brought into contact with the contact surfaces 12 of the plurality of base members 100B, and the central member 10 of the plurality of base members 100B may support the base material 300B. ..

[Effects of Second Embodiment]
The base member 100B according to the second embodiment has substantially the same operational effects as the base member 100A according to the first embodiment. Since the contact surface 12 is provided on the upper end of the center member 10 in the base member 100B, even if the size of the structure is larger than the inner space of the center member 10, the structure contacts the contact surface 12. Can be contacted and supported. Further, as shown in FIG. 10, even a member having a length such as the base material 300B or a planar member may be brought into contact with the contact surface 12 of one or more base members 100B. Can be supported.

Further, the central member 10 has an inner space on the back surface side of the contact surface 12 and is provided with a through hole 11B from the outer periphery to the inner space. It is possible to insert a bolt tightening tool such as the above to perform the work on the bolt inserted in the through hole 13 of the contact surface 12. Therefore, the structure can be fixed to the contact surface 12 of the central member 10 even after the base member 100B is installed on the surface of the earth, and the construction can be facilitated.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

10 central member 11A, 13, h1 to h4, h11, h21 through hole 11B through hole 12 abutment surface 20, 20a to 20d guide part 21 integrated connecting part 100, 100A, 100B base member 200 pile 300A support post 300B base material a1 a4 axis C center line

Claims (6)

A base member for a pile foundation, which is a molded product that is used as one member of a pile foundation and in which a plurality of piles are inserted,
A plurality of guide portions having through holes that fix the driving angle of the piles that are driven obliquely with respect to the center line of the base member are arranged along the circumferential direction of the center line,
Of the plurality of guide parts, the axial direction of the first guide part and the axial direction of the second guide part that are adjacent to each other in the circumferential direction are in a twisted positional relationship with each other,
The first guide portion is integrally connected to the second guide portion with a peripheral wall being in contact with the second guide portion by an integral connecting portion having a length in the axial direction of the first guide portion ,
The length of the guide portion in the direction of the centerline is the same as the axis of the guide portion and the axis of each of the two guide portions adjacent to each other when viewed at right angles to the plane including the centerline. Substantially coincides with the length in the direction of the center line between virtual intersections,
Base member for pile foundation. The base member for a pile foundation according to claim 1, wherein all of the plurality of guide portions have adjacent guide portions and peripheral walls in contact with each other on the same plane orthogonal to the center line. The base member for a pile foundation according to claim 1 or 2 , wherein the plurality of guide portions are four guide portions arranged at 90° in a circumferential direction of the center line. The center line and the axis, the peripheral wall is central member is further disposed to be connected together in a state of being in contact with the peripheral wall of the plurality of guide portions, the pile according to any one of claims 1 to 3 Base member for foundation. The center member has an inner space into which a pillar can be inserted,
The base member for a pile foundation according to claim 4 , wherein the peripheral wall of the central member is provided with one or more through holes extending to the inner space. The central member has one end in the axial direction closed by a surface, and has an inner space on the back surface side of the surface,
The base member for a pile foundation according to claim 4 , wherein the peripheral wall of the central member is provided with one or more through holes extending to the inner space.

Images