JP6624797B2 - Construction method of pile foundation structure and pile foundation structure - Google Patents

Description

The present invention relates to a construction method and pile foundation structure of the pile foundation structure precast steel foundation member is disposed on the pile head.

The semi-rigid pile foundation structure can reduce the bending moment applied to the pile head while securing high shear transmission capacity, making it possible to design a reasonable pile.
As such a semi-rigid connection type pile foundation structure, for example, in Patent Document 1, a gap is formed around a pile head by covering a pile head with a cap, and a foundation slab and a foundation beam are constructed in this state. Then, a method of constructing a pile foundation structure in which a gap between a cap and a pile head is filled with a binder after a building frame is completed is disclosed.
Further, in Patent Document 2, a frustum-shaped mold is put on a pile head to form a space that expands downward as the space between the side surface of the pile head and the mold is formed. A construction method of a pile foundation structure in which concrete is cast so as to cover the foundation slab and the foundation beam is disclosed.

JP 2005-105531 A Japanese Patent No. 4723938

In the method for constructing a pile foundation structure disclosed in Patent Document 1, the degree of fixation of the pile changes depending on the embedding depth of the pile head in the foundation slab or the foundation beam. Therefore, if a construction error occurs in the pile head height of the foundation pile, the pile performance assumed at the time of design may not be able to be secured.
In addition, the method for constructing a pile foundation structure disclosed in Patent Document 2 shortens construction time, such as rebar arrangement work, installation / removal of formwork, placing and curing of concrete, which are performed on site when constructing a foundation slab and a foundation beam. Hinders the transformation.
An object of the present invention is to solve the above-mentioned problems, and a method of constructing a pile foundation structure that enables rational pile design and saves labor during construction. And to propose a pile foundation structure.

The present inventors cover a pile frustum-shaped cap member to cover the foundation pile, and cover the cap member as a pile foundation structure in which a precast foundation member is disposed on a pile head. A base member made of precast concrete with a concave portion formed at the lower end is arranged as described above, and a gap is secured between the side surface of the pile head and the inner surface of the cap member, and the concave portion of the cap member and the basic member is formed by the binder. Thus, the present invention has led to the invention of a pile foundation structure capable of eliminating the need for reinforcing bars and placing concrete on site and reducing the bending moment generated at the pile head.
In order to solve the above problems, a method for constructing a pile foundation structure according to the present invention is put a pile constructing step of constructing the foundation pile, the cap member to the pile head of the frustum of the foundation pile pile A precast concrete foundation member comprising a processing step, a foundation arranging step of arranging the foundation member on which the beam rebar is projected, and a coupling step of coupling the cap member and the foundation member to a foundation pile. A method of constructing a semi-rigid connection type pile foundation structure with a cap member interposed therebetween, wherein the foundation member has a thickness that allows a first gap between a bottom surface and an installation surface of the foundation member. the frustoconical recess sized to have a second gap below the control value of the construction accuracy for Kuishin shift with previously formed on the bottom surface between said cap member, from the top or side of the base member communicating with the frusto-conical recess Entry apertures and the advance from the top or side of the base member to form a discharge hole communicating with the truncated cone-shaped recess, in the pile head processing step, between the inner surface of the cap member and the side surface of the pile head Forming a gap that expands downwards, forming the base member in the base disposing step, performing a horizontal position and height adjustment of the base member, and in the joining step, while holding the gap, through the injection hole. The second gap provided between the upper surface and the side face of the cap member and the recess, and the first gap are filled with a binder, and the binder is discharged from the discharge hole or the first gap. Is confirmed , and the cap member and the base member are connected to each other.
Further, pile foundation structure of the present invention comprises a foundation pile, a frustum-shaped cap member placed over the pile head of the foundation pile, Oite, beam reinforcing bars are projected disposed above the foundation pile Precast concrete foundation member, comprising a semi-rigid joint type pile foundation structure, wherein a gap that expands downward is formed between a side surface of the pile head and an inner surface of the cap member. The base member has a thickness with a gap between the bottom surface and the installation surface of the base member, and a gap with a gap equal to or smaller than a management value of construction accuracy with respect to the core misalignment between the cap member and the cap member. A truncated conical recess is formed on the bottom surface , and an injection hole communicating with the truncated conical recess from the top surface or side surface of the base member and the truncated conical recess from the top surface or side surface of the base member. There is a discharge hole that leads to , Said base member horizontal position and height is adjusted, the binding material filled between said frustoconical recess and the upper surface and the side surface of the cap member, the bottom and the installation surface of said base member The cap member is connected to the cap member by a bonding material filled therebetween, and the base pile and the cap member are not connected.

According to the method for constructing a pile foundation structure and the pile foundation structure of the present invention, by using a precast foundation member, it is possible to save labor required for on-site reinforcing work, formwork and concrete placement. It becomes possible.
Also, even if there is a construction error in the pile head height, etc., the semi-rigid joint pile assumed at the time of design was designed to secure the gap on the side of the pile head with the cap member provided on the pile head. The head fixing degree can be maintained, and the effect of reducing the pile head bending moment can be reliably obtained.
In addition, the gap between the recess and the upper surface and the side surface of the cap member can absorb a construction error of the foundation pile, so that the foundation member can be disposed at a predetermined position and height. In particular, when the pillars and beams of the building are formed of precast members, it is difficult to join together the column members and beam members that have been dimensioned and made in advance if the position or height of the foundation member changes. Therefore, the installation accuracy of the installation position and height of the foundation member is extremely important.

If the method for constructing the pile foundation structure includes a step of installing a height adjusting member around the foundation pile before the foundation arranging step, a ground surface on which the foundation member is installed (leveling concrete upper surface) Even when there is unevenness or inclination, the base member can be installed with high accuracy.
Further, if the method for constructing the pile foundation structure includes a step of installing a leakage prevention member for preventing leakage of the binder around the pile head, the leakage of the binder is prevented by preventing the leakage of the binder. The injection volume can be minimized.
Further, when a groove is formed on the bottom surface of the base member so as to extend from the concave portion to the side surface, in the bonding step, the bonding material is injected until the bonding material is discharged from the groove. Thus, the filling state of the binder can be confirmed.

  ADVANTAGE OF THE INVENTION According to the construction method and pile foundation structure of the pile foundation structure of this invention, while making rational pile design possible, the labor at the time of construction and the construction period can be shortened.

It is a sectional view showing the pile foundation structure concerning a first embodiment. It is sectional drawing which shows the foundation member used for the pile foundation structure of FIG. (A) is sectional drawing which shows the installation situation of a base member, (b) is the AA arrow line view of (a). (A)-(c) is sectional drawing which shows the clearance gap between the side surface of a cap member and the inner surface of a recessed part when a base member is installed. It is a figure which shows the basic member of the basic structure which concerns on 2nd embodiment, (a) is sectional drawing, (b) is BB arrow view of (a). (A) is sectional drawing which shows the pile foundation structure in 3rd Embodiment, (b) is sectional drawing which shows the foundation installation process in the construction method of the pile foundation structure. It is a sectional view showing other forms of a pile foundation structure in a third embodiment. (A) is sectional drawing of the pile foundation structure which concerns on another form, (b) is sectional drawing which shows the foundation member of the pile foundation structure concerning other forms.

<First embodiment>
As shown in FIG. 1, a pile foundation structure 1 according to the first embodiment includes a foundation pile 2, a cap member 3, and a precast concrete foundation member 4. The main feature is that a gap is formed between the foundation pile 2 and the cap member 3 to realize a semi-rigid joint head fixing degree. In addition, the foundation member 4 having the concave portion 41 is disposed on the upper portion of the foundation pile 2, and the bonding material 5 is filled between the foundation pile 2 and the concave portion 41 to absorb the construction error of the foundation pile 2. Thus, the pile foundation structure 1 is provided at a predetermined position.
The foundation pile 2 is a ready-made pile embedded in the ground G. The foundation pile 2 may be a cast-in-place pile.
The foundation pile 2 includes a cylindrical member 21 having a hollow inside, and an annular end plate 22 attached to an upper end surface of the cylindrical member 21.
The material of the cylindrical member 21 is not limited as long as a desired strength can be obtained, and may be, for example, reinforced concrete, concrete with an outer shell steel pipe, steel pipe, or the like.
The end plate 22 is made of a steel member. The method of fixing the end plate 22 to the cylindrical member 21 is not limited, but when the cylindrical member 21 is made of concrete, the end plate 22 projects from the lower surface (the surface on the cylindrical member 21 side). A method of embedding the provided anchor (not shown) in the cylindrical member 21 or a method of embedding the end of a reinforcing steel bar or a PC steel rod in the cylindrical member 21 in the end plate 22 may be used. In addition, when the cylindrical member 21 is a steel member or a concrete member with an outer shell steel pipe, the cylindrical member 21 and the end plate 22 may be welded, or a jig or a bolt may be used. May be fixed.
The pile head of the foundation pile 2 protrudes from the ground surface, and the protruding portion is covered with a cap member 3.

The cap member 3 is a steel member covered on the pile head of the foundation pile 2 and has a truncated cone-shaped appearance.
The inner peripheral surface of the cap member 3 expands in diameter downward (having a truncated cone shape), and a lower portion is provided between the side surface of the pile head of the foundation pile 2 and the inner surface of the cap member 3. A void that expands as it goes is formed.

The foundation member 4 is a precast concrete member disposed above the foundation pile 2. The base member 4 of the present embodiment is a rectangular block-shaped member in plan view.
As shown in FIG. 2, the base member 4 has a truncated conical recess 41 that covers the cap member 3.
The base member 4 has an injection hole 42 and a discharge hole 43 extending from the upper surface to the recess 41. The number of the injection holes 42 is not limited. Further, the injection hole 42 and the discharge hole 43 may be formed so as to reach the concave portion 41 from the side surface of the base member 4. The injection hole 42 is a flow path for injecting the binder 5 into the recess 41. The discharge hole 43 functions as an air vent hole when injecting the binder, and also functions as a hole for checking the filling state of the recess 41 with the binder.
The concave portion 41 has a sufficiently large shape with respect to the cap member 3, and as shown in FIG. 1, when disposed above the foundation pile 2, the gap between the outer surface of the cap member 3 and the inner surface of the concave portion 41 is formed. A gap is formed in the gap. The size of the concave portion 41 is larger by about 100 mm in the radial direction than the outer diameter of the cap member 3. Since the management value of the construction accuracy with respect to the pile center deviation is 1/4 of the pile diameter D and 100 mm or less, the dimensions are set to be compatible with the pile center deviation. Further, in the present embodiment, when the pile head of the foundation pile 2 is positioned at a regular height as the height dimension of the concave portion 41, the upper surface of the cap member 3 and the bottom surface (top surface) of the concave portion 41 The depth is such that a gap of about 50 mm is formed therebetween. This is set from the allowable value of the construction error of the swallowing depth of the cap member 3 into the footing plus or minus 50 mm. The size of the gap between the concave portion 41 of the base member 4 and the cap member 3 is not limited to this and is arbitrary. Therefore, when the management value of the pile construction accuracy is strictly provided, the gap between the recess 41 and the cap member 3 can be reduced. In addition, for the purpose of reducing the weight of the base member 4 and the like, it is possible to increase the size of the concave portion 41 and increase the gap between the concave portion 41 and the cap member 3.
The base member 4 is connected to the cap member 3 by the bonding material 5 filled in the gap between the bottom surface of the concave portion 41, the upper surface of the cap member 3, and the gap between the inner peripheral surface of the concave portion 41 and the outer peripheral surface of the cap member 3. I have.
On the side surface of the base member 4 of the present embodiment, beam rebars 44, 44, ... that are connected to a base beam made of precast concrete or a base beam (not shown) formed of cast-in-place concrete are projected. In the present embodiment, a case will be described in which the beam rebars are arranged in two steps at the top and bottom in the side cross section of the base member 4, but the arrangement and the number of beam rebars are not limited.
Further, on the upper surface of the base member 4 of the present embodiment, column reinforcing bars 45, 45, ... embedded in the columns on which the base member 4 is erected protrude. The number and arrangement of the column reinforcing bars 45 are not limited, and may be set as appropriate.

Hereinafter, the construction method of the pile foundation structure of the present embodiment will be described.
The method for constructing a pile foundation structure according to the present embodiment includes a pile construction step, a pile head processing step, an adjusting member installation step, a foundation installation step, and a connection step.
The pile construction step is a step of constructing the foundation pile 2.
The foundation pile 2 is pressed into the ground G using a rotary press-fitting device (not shown).
When the construction (burying) of the foundation pile 2 is completed, the ground G around the foundation pile 2 is dug down to expose the pile head. When the construction (burial) of the foundation pile 2 is stopped at a position where the pile head is exposed, it is not necessary to dig the surrounding ground G.
Then, after the unevenness of the ground surface (floor surface) around the foundation pile 2 is adjusted, the crushed stone (not shown) is laid and compacted. The laying of crushed stone may be omitted depending on the condition of the ground surface.

The pile head processing step is a step of covering the pile head of the foundation pile 2 with the cap member 3.
The cap member 3 is covered so that the upper surface of the foundation pile 2 (end plate 22) is in close contact with the lower surface (inner surface) of the top of the cap member 3. In this way, a space is formed between the side surface of the pile head and the inner surface of the cap member 3 that expands downward.
When the cap member 3 is put on the pile head of the foundation pile 2, a ground material 61 (see FIG. 1) such as crushed stone or earth and sand is put on the outer periphery of the lower end of the cap member 3, and the lower edge of the cap member 3 and the ground surface And temporarily fix the cap member 3. The cap member 3 may be put on the pile head of the foundation pile 2 before laying the crushed stone.
After the cap member 3 is temporarily fixed, the leveling concrete 6 is cast on the ground surface (floor surface). The leveling concrete 6 is cast with the lower edge (the ground material 61) of the cap member 3 involved. In addition, the thickness of the leveling concrete 6 is not limited and may be set as appropriate.
Further, the ground improvement body may be provided only around the foundation pile 2 by stirring the cement powder or the cement-based solidifying agent into the ground around the foundation pile 2 without placing the leveling concrete 6. Further, the ground improvement body may be realized by compacting crushed stone to secure a predetermined layer thickness.
In the present embodiment, the leveling concrete 6 is cast in the installation range of the foundation member 4, but the range in which the leveling concrete 6 is cast is not limited. For example, the base member 4 may be cast over a wider area than the installation range. Moreover, when casting leveling concrete 6 for the purpose of fixing the cap member 3, the range where the leveling concrete 6 is cast may be limited to only the periphery of the foundation pile 2 (cap member 3).

The adjustment member installation step is a step of providing the height adjustment member 7 around the foundation pile 2 as shown in FIGS. 3 (a) and 3 (b).
The height adjusting member 7 is a member (so-called spacer) for positioning the base member 4 and adjusting the height. That is, if the foundation member 4 is installed directly on the leveling concrete 6 or the ground improvement body, even if it is not possible to secure sufficient accuracy with respect to the installation height and the inclination, the height adjustment member 7 Positioning and height adjustment can be easily performed.
The height adjusting member 7 is a spacer for arranging the base member 4 with high quality, and is formed of a non-shrink mortar in the present embodiment.
The height adjusting member 7 is formed by casting non-shrink mortar on the upper surface of the leveling concrete 6 and molding the upper end surface of the non-shrink mortar to a flat and predetermined height.
The configuration of the height adjusting member 7 is not limited, and may be, for example, a bolt-shaped jig embedded in the lower surface of the base member 4 so as to be able to advance and retreat. If such a jig is used, the height can be adjusted by rotating the height adjusting member 7. At this time, it is desirable to dispose an iron plate for load distribution at a position corresponding to the height adjusting member 7 of the leveling concrete 6.
Alternatively, a precast concrete flat plate can be used as the height adjusting member 7. In that case, by arranging the outer edge of the height adjusting member 7 and at least one side surface of the base member 4 so as to coincide with each other, not only the height but also the horizontal position of the base member 4 can be adjusted.
In addition, even when the base member 4 is directly installed on the upper surface of the leveling concrete 6, if a predetermined accuracy can be secured, the adjusting member installing step (the height adjusting member 7) may be omitted.

The foundation disposing step is a step of disposing the precast concrete foundation member 4.
The base member 4 is disposed so as to cover the cap member 3 with the concave portion 41 (to insert the cap member 3 into the concave portion 41) (see FIG. 3).
Since the concave portion 41 has a shape that is sufficiently large with respect to the outer shape of the cap member 3, even when the pile core position or the pile head height of the foundation pile 2 is shifted due to a construction error or the like. , Can be placed at regular positions. For example, as shown in FIG. 4A, when the pile core position of the foundation pile 2 is displaced, the displacement is absorbed by the gap between the outer peripheral surface of the cap member 3 and the inner peripheral surface of the concave portion 41. In addition, as shown in FIG. 4B, when the protruding height of the pile head of the foundation pile 2 is high, it is absorbed by the depth (height) of the concave portion 41. Furthermore, when the protruding height of the pile head of the foundation pile is low (small), a large gap is secured between the top surface of the cap member 3 and the bottom surface of the concave portion 41 (see FIG. 4C).

The joining step is a step of joining the cap member 3 and the base member 4.
The coupling between the cap member 3 and the base member 4 is performed by injecting a binder from the injection hole 42 and filling the gap between the cap member 3 and the recess 41 with the binder 5. The injection of the binder 5 is performed until it is confirmed that the binder is discharged from the discharge holes 43.
When the height adjusting member 7 is interposed between the foundation member 4 and the leveling concrete 6, it is confirmed that the binder flows out from the gap between the foundation member 4 and the leveling concrete 6. Thus, the filling state of the binder 5 may be confirmed.

According to the pile foundation structure 1 of the present embodiment and the method of constructing the same, since the precast foundation member 4 is used, the labor required for reinforcing arrangement, formwork and concrete placing during footing construction is omitted. It becomes possible. For this reason, it is possible to shorten the construction period and to save labor on site work.
In addition, by using the base member 4 manufactured in a factory or the like, a high-quality member is formed without being affected by weather or the like.
Further, since the construction error of the foundation pile 2 can be absorbed by the concave portion 41 of the foundation member 4, even when the construction error occurs in the foundation pile 2, the accuracy of the shape of the foundation beam and the accuracy of the upper skeleton can be improved. Etc. are not affected.
Since the positioning and height adjustment of the foundation member 4 are performed by the height adjustment member 7, the construction of the high-quality pile foundation structure 1 can be easily performed. In addition, since the cap member 3 is provided on the pile head of the foundation pile 2, even if a construction error occurs in the pile head height or the like, it is possible to secure the pile head fixing degree at the time of design. it can.
In addition, a gap is provided between the pile head of the foundation pile 2 and the cap member 3 to make the joining between the foundation pile 2 and the foundation member 4 semi-rigid (transmits axial force and allows rotation). In addition, the stress generated at the pile head during an earthquake can be reduced, and the seismic resistance of the foundation pile 2 can be increased.
By casting the leveling concrete 6, the cap member 3 can be fixed, and the height position of the base member 4 can be set by the leveling concrete.

<Second embodiment>
The pile foundation structure 1 according to the second embodiment includes a foundation pile 2, a cap member 3, and a foundation member 4, as shown in FIG. The main feature is that the provision of the grooves 46 radially on the lower end surface of the base member 4 makes it possible to easily check the filling state of the binder 5 provided between the base member 4 and the cap member 3.
Since the configurations of the foundation pile 2 and the cap member 3 are the same as those of the foundation pile 2 and the cap member 3 shown in the first embodiment, detailed description will be omitted.
The foundation member 4 is a precast concrete member disposed above the foundation pile 2. The base member 4 is a square block member in plan view. The base member 4 has a truncated conical recess 41 that covers the cap member 3.
The base member 4 has an injection hole 42 extending from the upper surface to the recess 41. The number and arrangement of the injection holes 42 are not limited. For example, the injection holes 42 may be formed so as to reach the concave portion 41 from the side surface of the base member 4.
The base member 4 is connected to the cap member 3 by a bonding material 5 filled in a gap between the concave portion 41 and the cap member 3.
Since the details of the concave portion 41 are the same as those described in the first embodiment, detailed description will be omitted.
As shown in FIG. 5B, a groove 46 extending from the concave portion 41 to the side surface of the base member 4 is formed on the bottom surface of the base member 4. In the present embodiment, four grooves 46, 46,... Are formed radially toward each side surface. The number, arrangement, and cross-sectional shape of the grooves 46 are not limited.

The method for constructing a pile foundation structure according to the present embodiment includes a pile construction step, a pile head processing step, a foundation arrangement step, and a coupling step.
The details of the pile construction step, the pile head processing step, and the foundation arranging step are the same as those described in the first embodiment, and thus detailed description is omitted.
The joining step is a step of joining the cap member 3 and the base member 4.
The coupling between the cap member 3 and the base member 4 is performed by injecting a binder from the injection hole 42 and filling the gap between the cap member 3 and the recess 41 with the binder 5. The injection of the binder 5 is performed until the outflow of the binder 5 from the four grooves 46, 46,... Is confirmed.

As described above, according to the pile foundation structure 1 of the present embodiment, the filling state of the binder can be confirmed by confirming the outflow of the binder 5 from the groove 46, so that high-quality construction can be easily performed.
The other effects of the pile foundation structure according to the second embodiment are the same as those described in the first embodiment, and a detailed description thereof will be omitted.

<Third embodiment>
The pile foundation structure 1 according to the third embodiment includes a foundation pile 2, a cap member 3, a foundation member 4, and a leakage prevention member 8, as shown in FIG. The main feature is that the leak prevention member 8 is provided on the lower end surface of the base member 4 so that the injection range of the binder 5 to be filled between the base member 4 and the cap member 3 is limited, and the injection amount is minimized. This is the point that can be suppressed.
Since the details of the foundation pile 2, the cap member 3, and the foundation member 4 are the same as those described in the first embodiment, detailed description will be omitted.
The leak prevention member 8 is an annular member or a rectangular member provided on the lower surface of the base member 4 and around the concave portion 41 as shown in FIG. The leak prevention member 8 of the present embodiment is made of a spring plate formed with a step in a cross-sectional view. The outer piece is fixed to the lower surface of the base member 4 and the inner piece is formed from the lower surface of the base member 4. It is installed with a gap.
As shown in FIG. 6 (a), the leak prevention member 8 has the inner piece leveled with the foundation member 4 installed above the foundation pile 2 (on the leveled concrete 6) and the leveled concrete 6 (or ground surface). Adhere to Therefore, even when a gap is formed between the base member 4 and the leveling concrete 6, the binder 5 injected into the recess 41 through the injection hole 42 is blocked by the leakage prevention member 8. Can be
The configuration of the leakage prevention member 8 is not limited. For example, the material of the leakage prevention member 8 is not limited, and may be, for example, a rubber member. Further, the leak prevention member 8 does not necessarily need to be fixed to the base member 4, and may be provided on the leveling concrete 6 around the cap member 3, as shown in FIG.

The method for constructing a pile foundation structure according to the present embodiment includes a pile construction step, a pile head processing step, an adjusting member installation step, a foundation installation step, and a connection step.
Note that details of the pile construction step, the pile head processing step, and the adjusting member installation step are the same as those described in the first embodiment, and thus a detailed description thereof will be omitted.
The foundation disposing step is a step of disposing the foundation member 4.
The base member 4 is provided so as to cover the cap member 3 with the concave portion 41 (to insert the cap member 3 into the concave portion 41) (see FIG. 6A).
When the base member 4 is disposed at a predetermined position, the leak preventing member 8 provided on the lower surface of the base member 4 is leveled and adheres to the concrete 6.
The details of the other basic arranging steps are the same as those described in the first embodiment, and a detailed description thereof will be omitted.
The joining step is a step of joining the cap member 3 and the base member 4.
The coupling between the cap member 3 and the base member 4 is performed by injecting a binder from the injection hole 42 and filling the gap between the cap member 3 and the recess 41 with the binder 5. The injection of the binder 5 is performed until it is confirmed that the binder 5 is discharged from the discharge holes 43.

According to the pile foundation structure 1 of the present embodiment and the method of constructing the same, since the leak prevention member 8 is provided around the concave portion 41, the injection range of the binder 5 can be limited. Therefore, the injection amount of the binder 5 can be reduced to a necessary minimum, which is economical.
Since the construction method of the pile foundation structure and the operation and effect of the pile foundation structure 1 according to the third embodiment are the same as those shown in the first embodiment, detailed description will be omitted.

The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and each of the above-described components can be appropriately changed without departing from the spirit of the present invention.
For example, the structure to which the pile foundation structure 1 of the present invention can be applied is not limited.
In addition, as shown in FIG. 8A, when the pullout resistance member 23 is erected at the upper end of the foundation pile 2, a through hole 47 may be formed in the foundation member 4. The through hole 47 has a stepped cylindrical shape and is formed corresponding to the position of the pull-out resistance member 23. Then, in the basic disposing step, the pull-out resistance member 23 is inserted into the through hole 47, and the pull-out resistance member 23 is fixed to the interruption of the through hole 47. According to the pile foundation structure 1, even when a pulling force acts on the foundation pile 2, the pile foundation structure of the present invention can be constructed.
Further, as shown in FIG. 8B, a part 48 of the foundation beam may be formed integrally with the foundation member 4. According to such a pile foundation structure, it is possible to prevent the joint between the foundation member 4 and the foundation beam from being located at the end of the foundation beam where stress tends to concentrate.
Further, in the above-described embodiment, the case where the concave portion 41 has a truncated conical shape has been described. However, the shape of the concave portion 41 is not limited as long as the cap member 3 can be inserted therein. And may be spherical.
In the above-described embodiment, the case where one foundation member 4 is provided for one foundation pile 2 has been described. However, a plurality of foundation piles 2 may be connected to the foundation member 4.
The inner surface (surface) of the concave portion 41 may have irregularities in order to enhance the integration with the binder 5. Further, the inner surface of the concave portion 41 may be covered with a steel member for the purpose of increasing the strength.
Further, the cap member 3 may be provided with a rib or the like for the purpose of enhancing the integrity with the bonding material 5.

DESCRIPTION OF SYMBOLS 1 Pile foundation structure 2 Foundation pile 3 Cap member 4 Foundation member 41 Depression 5 Bonding material 6 Leveling concrete 7 Height adjustment member 8 Leak prevention member

Claims (3)

A method of constructing a semi-rigid connection type pile foundation structure via a cap member between a precast concrete foundation member and a foundation pile ,
A pile constructing step of constructing the foundation pile,
A pile processing step covering the frustum of said cap member to pile head of the foundation pile,
A foundation disposed step of disposing the foundation member beam reinforcing bars are projected,
Coupling step of coupling the cap member and the base member,
The base member has a thickness that allows a first gap between a bottom surface and an installation surface of the base member, and a second gap between the cap member and the capping member that is equal to or less than a management value of construction accuracy with respect to a pile center misalignment. A truncated cone-shaped recess having a size that can be formed is formed on the bottom surface, and an injection hole communicating with the truncated cone-shaped recess from the top surface or side surface of the base member and the truncated cone shape from the top surface or side surface of the base member are formed. A discharge hole leading to the concave part of
In the pile head processing step, to form a gap expanding downward between the side surface of the pile head and the inner surface of the cap member,
In the foundation disposing step, a horizontal position and a height of the foundation member are adjusted,
In the joining step, while holding the gap , the second gap provided between the upper surface and the side face of the cap member and the recess through the injection hole, and a joining material in the first gap. A method of constructing a pile foundation structure , comprising filling and confirming discharge of the binder from the discharge hole or the first gap , and coupling the cap member and the foundation member.   The method for constructing a pile foundation structure according to claim 1, further comprising a step of installing a height adjusting member around the foundation pile before the foundation disposing step. A foundation pile,
A frustum-shaped cap member covered on the pile head of the foundation pile,
The Oite above the foundation pile, a pile foundation structure of semirigid junction type comprising a precast concrete foundation members beam reinforcing bars are projected disposed, and
A gap that expands downward is formed between the side surface of the pile head and the inner surface of the cap member,
The base member has a thickness that allows a gap between the bottom surface and the installation surface of the base member, and a cone having a size that allows a gap equal to or less than the management value of the construction accuracy with respect to the core misalignment between the cap member and the cap member. A trapezoidal recess is formed in the bottom surface , and an injection hole communicating from the upper surface or side surface of the base member to the truncated cone shape, and a discharge hole communicating from the upper surface or side surface of the base member to the truncated cone shape. Is provided,
The base member, whose horizontal position and height have been adjusted, has a bonding material filled between the truncated conical recess and the upper surface and side surfaces of the cap member, and between the bottom surface and the installation surface of the base member. A pile foundation structure, wherein the foundation member and the cap member are not coupled to each other by a coupling material filled in the cap member, and the foundation member and the cap member are not coupled.

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