JP2010106496A - One-column and one-pile type foundation structure and construction method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-column and one-pile type foundation structure and its construction method that can surely and easily join a concrete pile and a column. <P>SOLUTION: The one-column and one-pile type foundation structure 100 has a joining unit 4 made of steel and formed in cylinder shape, arranged on the upper side of a head 1 of the concrete pile 3. Upper ends 2A of pile main reinforcements 2 projected from the head 1 of the concrete pile 3, and the lower end 6 of the column 7 erected upward are arranged inside the joining unit 4, and concrete 5 for fixing the upper ends 2A of the pile main reinforcements 2 of the concrete pile 3 to the lower end 6 of the column 7 is filled in the joining unit 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a one-column / one-pile-type foundation structure used for a foundation of a building or the like and a construction method thereof.

  Currently, the foundations of reinforced steel structures such as boilers are constructed by placing a large number of small-diameter piles and supporting them with a large number of small-diameter piles via huge concrete frame parts such as footing foundations and mat foundations. Yes. For this reason, a large-scale work such as placing a large number of small-diameter piles or constructing a concrete frame portion has been required. Further, when there is a pipe near the road or near the road, the foundation construction space is limited, and thus there is a problem that the foundation cannot be constructed by the same construction method.

And in order to solve such a problem, the compact 1 pillar 1 pile type foundation structure which inserts and supports one pillar with respect to one big pile is provided (for example, patent document 1, 2). The foundation structure shown in these patent documents is such that a hollow steel pipe pile provided with a wing for screwing is provided at the front end or in the vicinity of the front end and is buried in the ground, and in the joint at the front end of the steel pipe pile. After inserting the lower part of the pillar of the building, the joint is filled with concrete. And it is set as the structure which can fix and support the pillar of a building with respect to a steel pipe pile by concrete placement in such a junction part.
In addition, as the foundation structure of one pillar and one pile type, the joint unit is fixed by welding and fixing the pile head to the head of the pile, or by fastening with an anchor bolt and a nut installed in advance on the head of the pile. And the structure which aims at integration by filling concrete in the state which has arrange | positioned the lower end part of a pillar inside the joining unit is proposed (for example, refer patent document 3).

And in order to solve such a problem, the 1 pillar 1 pile foundation structure shown by patent document 3 is provided. This one-column / one-pile foundation structure lays a pile (steel pipe pile or concrete pile) in the ground, puts a joining member on the pile head of this pile, and makes the center of the pile core coincide with the center of the joining member. Can be joined by welding or bolts and nuts, etc., and then inserting the tip of the column base into the internal space of the joint member and placing concrete. To do.
JP 2000-129690 A JP 2001-295291 A JP 2007-63854 A

  However, such foundation structures shown in Patent Documents 1 and 2 are techniques for supporting columns on steel pipe piles, and cannot be applied when a concrete pile is selected as the pile foundation. Moreover, in the foundation structure shown by patent document 3, although both a steel pipe pile and a concrete pile can be selected as a pile foundation, about the concretely disclosed structure which fixes a joining unit, it is a steel pipe pile. No specific structure is disclosed for concrete piles. In addition, although patent document 3 is disclosing the point which installs an anchor bolt in a pile and fixes a joining unit as mentioned above, in concrete pile, it is concrete so that joining strength can be ensured only with an anchor bolt. It is difficult and practical to install anchor bolts with a fixing length on the pile side.

  The present invention has been made in view of the above-described circumstances, and provides a one-column / one-pile-type foundation structure capable of reliably and easily joining a concrete pile and a column, and a construction method thereof. To do.

In order to solve the above problems, the present invention proposes the following means.
That is, in the one-column / one-pile-type foundation structure of the present invention, a steel joining unit formed in a cylindrical shape is arranged on the upper side of the concrete pile head, and the head of the concrete pile is placed inside the joining unit. The upper part of the pile main bar protruding from the part and the lower end part of the column erected upward are arranged and filled with the concrete that fixes the upper part of the pile main bar of the concrete pile and the lower part of the column. It is characterized by being.

  Moreover, the construction method of the 1 pillar 1 pile type foundation structure of this invention is the pile which protruded from the head of the said concrete pile inside the steel joining unit formed in the cylinder shape above the head of the concrete pile. The main bar is arranged in such a manner that the upper end portion is arranged, and the column is erected upward in a state where the lower end portion is arranged in the inside of the joining unit, and then the concrete is filled in the inside of the joining unit. The upper end of the pile main reinforcement of the concrete pile and the lower end of the column are fixed.

  In this configuration and method, an upper end portion of a pile main bar protruding from the head of the concrete pile and an upright portion are installed in a cylindrical and steel joining unit disposed on the upper side of the concrete pile. The lower end of the column was positioned, and concrete for fixing the upper end of the pile main bar and the lower end of the column of these concrete piles was filled. For this reason, it is possible to reliably join the concrete pile and the column with the necessary joining strength through the pile main bar and the joining unit protruding from the head of the concrete pile. Moreover, since it is only necessary to install a joining unit and a column above the head of the concrete pile and fill the inside of the joining unit with concrete, the concrete pile and the pillar can be easily joined.

  Further, in the one-column / one-pile-type foundation structure described above, it is more preferable that the joining unit has a bottom plate, and the bottom plate is supported on a top end surface of the head portion of the concrete pile.

  Moreover, in the construction method of said 1 pillar 1 pile type foundation structure, what used the thing which has a bottom plate as said joining unit, and this bottom plate was made to be supported by the head upper end surface of the said concrete pile. More preferred.

  In this configuration and method, since the bottom plate of the joining unit is supported on the upper end surface of the head of the concrete pile, the joining unit can be stably supported on the head of the concrete pile via the bottom plate. Moreover, a joining unit can be easily installed on the head of a concrete pile also at the time of construction.

  Moreover, in said 1 pillar 1 pile-type foundation structure, it is more preferable that the bottom plate of the said joining unit is formed with an insertion hole through which the upper end portion of the pile main bar protruding from the head of the concrete pile is inserted. preferable.

  Moreover, in the construction method of said 1 pillar 1 pile type foundation structure, what uses the through-hole connected to the said bottom plate up and down as said joining unit is used, and the head of the said concrete pile is used for this through-hole It is more preferable that the joining unit is arranged through the upper end of the pile main bar protruding from the top.

  In this configuration and method, the bottom plate of the joining unit is formed with an insertion hole for inserting the upper end portion of the pile main bar protruding from the head of the concrete pile. The concrete pile and the joining unit can be suitably integrated while being arranged inside the joining unit.

  Moreover, in said 1 pillar 1 pile-type foundation structure, it is preferable that the fixing member which fixes the pile main reinforcement upper end part of the said concrete pile penetrated by the said insertion hole is provided in the bottom plate of the said joining unit. .

  Moreover, in the construction method of said 1 pillar 1 pile type foundation structure, fixing the pile main reinforcement upper end part of the said concrete pile penetrated to the said insertion hole of the bottom plate of the said joining unit and the said bottom plate with a fixing member. More preferred.

  In this configuration and method, the bottom plate of the joining unit is provided with a fixing member for fixing the upper end of the pile main bar of the concrete pile inserted through the insertion hole. Even when the length is short and a sufficient fixing length cannot be obtained, it is possible to ensure the necessary joint strength between the concrete pile and the joint unit.

  Further, in the one-column / one-pile-type foundation structure, the bottom plate of the joining unit is provided with a communication hole through which the concrete cast in the joining unit can be circulated to the concrete pile side. More preferably.

  Moreover, in the construction method of said 1 pillar 1 pile type foundation structure, what uses the connection hole connected to the said baseplate in the up-down direction as said joining unit is used, and concrete is cast in said joining unit. In this case, it is more preferable to distribute the concrete to the concrete pile side through the communication hole.

  In this configuration and method, the joining unit can circulate the concrete placed in the joining unit through the connecting hole formed in the bottom plate to the concrete pile side, and is filled between the concrete pile and the joining unit. Can do. For this reason, the joint strength between the concrete pile and the joining unit can be further improved, and thereby the concrete pile and the column can be firmly connected.

  In the one-pillar-one-stake-type foundation structure described above, it is more preferable that an anchor embedded in a head portion of the concrete pile is provided on the bottom plate of the joining unit so as to protrude downward.

  Moreover, in the construction method of said 1 pillar 1 pile type foundation structure, what used the thing by which the anchor was protruded and provided in the bottom plate downward was used as said joining unit, and this anchor was used for the head of the said concrete pile. More preferably, the joining unit is arranged so as to be buried.

  In this configuration and method, the anchor is provided so as to protrude downward on the bottom plate of the joining unit, and the anchor is embedded in the head of the concrete pile, so that the joining strength between the concrete pile and the joining unit can be further improved. This makes it possible to firmly connect the concrete pile and the column.

  Moreover, in said 1 pillar 1 pile-type foundation structure, the widening part formed so that it might be widened as a width dimension larger than a diameter dimension in the pile main reinforcement upper end part of the concrete pile located in the inside of the said joint unit. More preferably, it is provided.

  Moreover, in the construction method of the above-mentioned one-column / one-stake-type foundation structure, the upper part of the pile main bar of the concrete pile disposed inside the joining unit is formed to be widened as a width dimension larger than the diameter dimension. More preferably, a widened portion is provided.

  In this configuration and method, since the widening portion formed so as to widen as a width dimension larger than the diameter dimension is provided at the upper end portion of the pile main reinforcement of the concrete pile located inside the joining unit, the widening portion The pull-out strength of the pile main bar depends on the shear strength by the cone-shaped fracture surface with the widened portion as the base, not the adhesion force between the pile main bar and the joining unit. For this reason, the joint strength between the concrete pile and the joining unit can be further improved, and thereby the concrete pile and the column can be firmly connected.

  Moreover, in said 1 pillar 1 pile-type foundation structure, it was bent toward the side or the downward direction from the state extended to the pile main reinforcement upper end part of the concrete pile located inside the said joining unit. More preferably, a bent portion is provided.

  Moreover, in the construction method of the above-mentioned one-column / one-stake type foundation structure, the upper end portion of the pile main reinforcement of the concrete pile disposed inside the joining unit is extended from the upper side to the side or the lower side. More preferably, a bent portion is provided.

  In this configuration, since the pile main bar bending portion is provided at the upper end of the pile main bar of the concrete pile located inside the joint unit, the pull-out strength of the pile main bar is only the adhesion force between the pile main bar and the joint unit. Instead, it also depends on the engaging force of the bent portion with respect to the concrete filled in the joining unit. For this reason, the joint strength between the concrete pile and the joining unit can be further improved, and thereby the concrete pile and the column can be firmly connected.

In the one-column / one-pile type foundation structure of the present invention, the pile main reinforcement upper end of the concrete pile and the lower end of the column are arranged inside the joining unit and filled with concrete, so that the concrete pile and the column can be reliably secured. And can be easily joined even during construction.
In the construction method of the foundation structure of the 1 pillar 1 pile type of the present invention, the joining unit is arranged on the upper side of the concrete pile head, and the pile main reinforcement and the lower end of the pillar are arranged inside to fill the concrete. Therefore, the concrete pile and the column can be easily joined, and reliable joining can be realized in the joined state.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a one-pillar-one-pile-type foundation structure 100 according to the first embodiment is a concrete pile arranged such that a pile main bar 2 protrudes upward from an upper end surface 1 </ b> A of a head 1. 3, a steel joining unit 4 disposed above the head 1 of the concrete pile 3, and a column 7 whose lower end 6 is supported by concrete 5 placed in the joining unit 4. I have it.

  As shown in FIGS. 1 and 3, the concrete pile 3 has a plurality of pile main bars 2 arranged along the length direction inside the concrete pile main body 8, and the whole is buried vertically in the underground G. The upper end 2A of the pile main bars 2 is protruded from the upper end surface 1A of the head 1 formed flat and disposed in the joining unit 4. In addition, when these pile main reinforcements 2 planarly view the concrete pile 3, the multiple pieces are arrange | positioned at intervals in the circumferential direction.

The joining unit 4 includes a unit main body 9 formed in a cylindrical shape and a bottom plate 10 provided at the lower end of the unit main body 9. The unit main body 9 and the bottom plate 10 are integrally provided. Concrete 5 is placed in the interior 4A surrounded by.
The bottom plate 10 is formed with a plurality of insertion holes 11 through which the upper end portion 2A of the pile main reinforcement 2 of the concrete pile 3 is inserted. As shown in FIG. 2, the plurality of insertion holes 11 are provided in the circumferential direction corresponding to the positions of the pile main reinforcing bars 2 of the concrete pile 3, and each inner diameter is the same as that of the concrete pile 3. The outer diameter of the pile main reinforcement 2 is set slightly larger. In such a joining unit 4, when the bottom plate 10 is placed on the upper end surface 1 </ b> A of the head 1 of the concrete pile 3, the pile main reinforcement 2 of the concrete pile 3 is inserted into the insertion hole 11 of the bottom plate 10. Is inserted and accurately positioned on the head 1 of the concrete pile 3.

  Further, the concrete 5 inside the joining unit 4 </ b> A is inserted through the pile main reinforcement 2 of the concrete pile 3 through the insertion hole 11 formed in the bottom plate 10, and the lower end portion 6 of the column 7 is positioned in the joining unit 4. It will be placed in the state of letting. And by such a concrete 5, the upper end part 2A of the pile main reinforcement 2 of this concrete pile 3 and the joining unit 4 are joined, and the lower end part 6 and the joining unit 4 of the pillar 7 are joined, thereby, concrete. The pile 3 and the pillar 7 are connected.

  The column 7 has an enlarged diameter 6A located at the end of the lower end 6 thereof. In addition, for example, as shown in FIG. 3, a plurality of the pillars 7 are provided corresponding to the concrete piles 3, and form a lattice-like framework via the plurality of beams 12 at the upper positions thereof. .

  And in the 1 pillar 1 pile type foundation structure 100 as mentioned above, first, the concrete pile 3 in which the pile main reinforcement 2 protrudes upward from the upper end surface 1A of the head 1 is installed in the underground G. Thereafter, the joining unit 4 is placed on the concrete pile 3 so that the bottom plate 10 is in close contact with the top end surface 1A of the head of the concrete pile 3 while the pile main reinforcement 2 of the concrete pile 3 is inserted through the insertion hole 11. . Thereafter, the concrete 5 is placed in the interior 4 </ b> A of the joining unit 4 in a state where the pillar 7 is arranged at a predetermined horizontal position so that the lower end portion 6 is located in the joining unit 4. Then, by placing the concrete 5, the concrete pile 3 and the lower end portion 6 of the column 7 are coupled via the pile main reinforcement 2.

  As described in detail above, in the one-pillar-one-pile-type foundation structure 100 shown in the present embodiment, the concrete is placed in the interior 4 </ b> A of the tubular joining unit 4 disposed on the upper side of the head 1 of the concrete pile 3. The upper end 2A of the pile main bar 2 projecting from the head 1 of the pile 3 and the lower end 6 of the column 7 erected upward are positioned, and the upper end 2A of the pile main bar 2 and the column 7 Concrete 5 for fixing the lower end portion 6 was filled. For this reason, the concrete pile 3 and the column 7 can be reliably joined to each other while ensuring the necessary joining strength through the pile main reinforcement 2 and the joining unit 4 protruding from the head 1 of the concrete pile 3. Moreover, since the joining unit 4 and the pillar 7 are installed on the upper side of the head 1 of the concrete pile 3 and the concrete 5 is simply filled in the inside of the joining unit 4, the concrete pile 3 and the pillar 7 are easily joined. can do.

  Moreover, in the 1 pillar 1 pile type foundation structure 100, since the bottom plate 10 of the joining unit 4 is supported by the top end surface 1A of the head of the concrete pile 3, the joining unit 4 is connected to the concrete pile via the bottom plate 10. 3 can be stably supported on the top end surface 1A of the head. Further, the joining unit 4 can be easily installed on the head 1 of the concrete pile 3 even during construction.

  Moreover, in the 1 pillar 1 pile type foundation structure 100, the insertion hole 11 for allowing the bottom plate 10 of the joining unit 4 to insert the upper end 2A of the pile main reinforcement 2 protruding from the head 1 of the concrete pile 3 is formed. ing. For this reason, it is possible to suitably integrate the concrete pile 3 and the joining unit 4 while disposing the upper end 2A of the pile main reinforcement 2 inside the joining unit 4 without hindering the bottom plate 10.

  In the above embodiment, the insertion hole 11 having an inner diameter slightly larger than the diameter of the pile main reinforcement 2 of the concrete pile 3 is formed in the bottom plate 10 of the joining unit 4, but the present invention is not limited to this. And you may form the penetration hole 20 which has an internal diameter about twice with respect to the diameter of the pile main reinforcement 2 of the concrete pile 3 like the 1-pillar 1 pile-type foundation structure 100A shown in FIG. By providing the insertion hole 20 having such a large inner diameter, even if there is a slight shift in the position of the pile main reinforcement 2 of the concrete pile 3, the deviation is allowed and the pile main reinforcement 2 is inserted. It can be smoothly inserted into the hole 20.

  Moreover, although the joining unit 4 which provided the cylindrical unit main-body part 9 and the baseplate 10 integrally was used, it is not limited to this, You may make these unit main-body part 9 and the baseplate 10 into a different body. In this case, after placing the bottom plate 10 on the head upper end surface 1A of the concrete pile 3 at the site, the unit main body 9 may be joined and integrated with the bottom plate 10. In addition, the joining unit 4 does not necessarily require the bottom plate 10, but the unit main body 9 is temporarily fixed on the head 1 of the concrete pile 3, and the concrete 5 is filled in this state. For example, a configuration without the bottom plate 10 may be adopted.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 6 and 7, the one-column / one-pile type foundation structure 101 according to this embodiment is different from the one-column / one-pile type foundation structure 100 according to the first embodiment in configuration. The upper end 2A of the pile main reinforcement 2 of the concrete pile 3 and the bottom plate 10 of the joining unit 4 are welded to form a welded portion 30 as a fixing member, thereby fixing them.
The welded portion 30 is provided on the base end of the upper end portion 2 </ b> A of the pile main reinforcement 2 of the concrete pile 3 inserted through the insertion hole 11 of the bottom plate 10 and the bottom plate 10 positioned around the insertion hole 11. . And by such a welding part 30, even when the length of the upper end part 2A of the pile main reinforcement 2 of the concrete pile 3 is not enough, and sufficient fixing length cannot be taken, the concrete pile 3 and the joining unit 4 are connected. Necessary joint strength can be ensured, and the concrete pile 3 and the column 7 can be firmly connected.

6 and 7 is an example when applied to the bottom plate 10 (see FIGS. 1 and 2) having the insertion hole 11 having an inner diameter slightly larger than the diameter of the pile main reinforcing bar 2 of the concrete pile 3. In the case of applying to the bottom plate 10 (see FIGS. 4 and 5) having the insertion hole 20 having an inner diameter of about twice the diameter of the pile main reinforcement 2 of the concrete pile 3, the welding is not limited thereto. Since sufficient connection cannot be realized by the portion 30 alone, the washer 31 may be incorporated as a fixing member as in the one-column / one-pile-type foundation structure 101A shown in FIGS.
The washer 31 has a washer hole 31 A having an inner diameter slightly larger than the diameter of the pile main reinforcement 2 of the concrete pile 3, and has an outer diameter larger than the diameter of the insertion hole 20. And such a washer 31 is interposed, and the pile main reinforcement upper end part 2A of the concrete pile 3 and the bottom plate 10 of the joining unit 4 are welded.

  As described in detail above, in the one-column / one-pile-type foundation structure 101 shown in the present embodiment, the pile main bar upper end 2A of the concrete pile 3 inserted into the insertion holes 11 and 20 in the bottom plate 10 of the joining unit 4. For example, the length of the pile main bar upper end 2A of the concrete pile 3 is not sufficient, and the fixing is sufficient. Even when the length cannot be taken, the required strength of joining the concrete pile 3 and the joining unit 4 can be ensured, and the concrete pile 3 and the column 7 can be firmly connected.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 10, the structure of the one-column / one-pile foundation structure 102 according to this embodiment is different from that of the one-column / one-pile foundation structure 100/101 according to the previous embodiment. The widening part 40 is each provided in the pile main bar upper end part 2A of the pile 3.
These widened portions 40 are widened with a width dimension larger than the radial dimension of the pile main reinforcement 2 in order to increase the resistance to the load applied in the length direction of the pile principal reinforcement 2, and have a shape projecting in the radial direction of the pile reinforcement 2 It is said that. Specifically, for example, a steel bar or the like is prepared as the widened portion 40 and is integrated by, for example, welding to the pile main reinforcement 2. And when there is no such widening part 40, as shown in FIG. 11, the resistance force to the arrow A direction is produced | generated by the adhesive force of the concrete 5 around the pile main reinforcement 2, and this pile main reinforcement 2 I am trying to establish it. On the other hand, in this embodiment, the cone-shaped shear fracture surface 41 starting from the tip of the widened portion 30 is formed by the widened portion 40 provided at the tip of the pile main reinforcement 2 as shown in FIG. Will be formed. For this reason, the pulling-out strength with respect to the concrete 5 of the pile main reinforcement 2 can be improved. For this reason, the joint strength of the concrete pile 3 and the joining unit 4 can further be improved, and the concrete pile 3 and the pillar 7 can be connected firmly by this.

  As described in detail above, in the one-column / one-pile-type foundation structure 102 shown in the present embodiment, the length of the pile main reinforcement 2 is placed on the pile main reinforcement upper end portion 2A of the concrete pile 3 located in the interior 4A of the joining unit 4. Since the widened portion 40 having an increased diameter is provided in order to increase the resistance force to the load applied in the direction, the hardened concrete that can withstand a larger load applied to the column 7 by the widened portion 40. The connection with the pile 3 can be realized.

  In addition, the widening part 40 shown by the said embodiment is good also as what is provided from the beginning in the terminal of the pile main reinforcement 2, for example, the large diameter which the widening part 40 as shown in FIG.4 and FIG.5 can pass through is sufficient. The joint unit 4 having the insertion hole 20 may be used.

Further, instead of the widened portion 40, the pile main reinforcing bars 2 themselves may be processed to improve the pulling strength. FIG. 13 shows a modification of this embodiment. As shown in FIG. 13, in the basic structure 102 </ b> A of this modified example, a bent portion 2 </ b> B is provided by bending the tip of the upper end portion 2 </ b> A of the pile main reinforcing bar 2 into, for example, a U shape. And also by such a bending part 2B, with respect to the concrete 5 with which not only the adhesive force of the pile main reinforcement 2 and the concrete 5 with which the joining unit 4 was filled but the filling unit 4 with this bending part 2B was filled. It also depends on the engagement force. For this reason, the joint strength of the concrete pile 3 and the joining unit 4 can further be improved, and the concrete pile 3 and the pillar 7 can be connected firmly by this.
In addition, although the bending part 2B was made into U shape in the above, it is not restricted to this, For example, it may be L-shaped etc., and it is a side from the state where the front-end | tip of the upper end part 2A of the pile main reinforcement 2 was extended upwards Or the same effect is produced by bending downward.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 14 and 15, the one-column / one-pile type foundation structure 103 according to the present embodiment is different in configuration from the one-column / one-pile type foundation structure 100 to 102 according to the previous embodiment. In addition, a communication hole 50 is provided in the central portion of the bottom plate 10 of the joining unit 4.
The communication hole 50 is used to fill the concrete 5 between the concrete pile 3 and the joining unit 4 by flowing the concrete 5 placed in the joining unit 4 to the concrete pile 3 side. For this reason, the joint strength of the concrete pile 3 and the joining unit 4 can further be improved, and the concrete pile 3 and the pillar 7 can be connected firmly by this.
In addition, although the one communication hole 50 shall be provided in the center part of the baseplate 10 of the joining unit 4, it is not limited to one and multiple may be sufficient. Further, the size of the communication hole 50 may be as large as the pile main reinforcement 2 is inserted into the inside.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 16, the one-pillar-one-pile-type foundation structure 104 according to the present embodiment is different from the one-pillar-one-pile-type foundation structure 103 according to the fourth embodiment in the joining unit. The anchor 51 protrudes downward from the bottom plate 10 of 4 and is embedded in the head 1 of the concrete pile 3.
The anchor 51 passes through the connecting hole 50, and the concrete 5 is filled between the top end surface 1A of the concrete pile 3 and the bottom plate 10 of the joining unit 4 (this portion of concrete is denoted as 5A). ), And thus integrated. And the joint strength of the concrete pile 3 and the joining unit 4 can further be improved by such an anchor 51, and the concrete pile 3 and the pillar 7 can be connected firmly by this.
The position of the anchor 51 is preferably on the outer peripheral side. By doing in this way, since the arm length with respect to bending can be ensured to the maximum and the transmission couple is reduced, the bending proof stress in the joining position of the joining unit 4 and the concrete pile 3 can be improved.

  Then, as a procedure for installing the joining unit 4 having such an anchor 51, first, as shown in FIG. 17, in order to secure in advance an area (indicated by reference numeral 51A) where the anchor 51 is installed, a concrete pile is slightly used. The upper end 2A of the pile main reinforcement 2 protruding from the head 1 of 3 is set in advance long, and the pile main reinforcement 2 of the concrete pile 3 is inserted through the insertion hole 11 in this state, while the head of the concrete pile 3 is inserted. The joining unit 4 is placed on the upper end surface 1A. Thereafter, as shown in FIG. 16, the concrete 5 is placed in the interior 4 </ b> A of the joining unit 4 with the lower end portion 6 of the column 7 positioned in the joining unit 4. The concrete 5 laid here is filled into a region 51 </ b> A between the bottom plate 10 of the joining unit 4 where the anchor 51 is disposed and the head upper end surface 1 </ b> A of the concrete pile 3 through the communication hole 50. And the head 1 of the concrete pile 3 is comprised by the concrete 5 (5A) laid in this way, and the pile main reinforcement 2 in this concrete pile 3 and the lower end part 6 of the pillar 7 are mutually connected. At the same time, the anchor 51 of the joining unit 4 is buried and fixed.

  As described in detail above, in the one-column / one-stake-type foundation structure 104 shown in the present embodiment, the anchor 51 is positioned on the bottom plate 10 of the joining unit 4 and on the side facing the top end surface 1A of the concrete pile 3. Then, the anchor 51 was supported via the concrete 5 (5A) filled between the top end face 1A of the concrete pile 3 and the bottom plate 10 of the joining unit 4. And the presence of such an anchor 51 can improve the proof stress with respect to the bending direction of the pillar 7, and it becomes possible to support this pillar 7 more stably.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is a front sectional view showing the foundation structure of the 1 pillar 1 pile type concerning the 1st embodiment of the present invention. It is a top view at the time of seeing the joining unit of Drawing 1 from the upper part. It is a figure at the time of constructing a plurality of pillars by the 1 pillar 1 pile type foundation structure concerning a 1st embodiment of the present invention. It is a front sectional view which shows the modification of the foundation structure of 1 pillar 1 pile type shown in FIG. It is a top view at the time of seeing the joining unit of Drawing 4 from the upper part. It is a front sectional view showing the foundation structure of the 1 pillar 1 pile type concerning the 2nd embodiment of the present invention. FIG. 7 is an enlarged view of a portion indicated by VII in FIG. 6. It is a front sectional view which shows the modification of the foundation structure of 1 pillar 1 pile type shown in FIG. FIG. 9 is an enlarged view of a portion indicated by IX in FIG. 8. It is a front sectional view showing the foundation structure of the 1 pillar 1 pile type concerning the 3rd embodiment of the present invention. It is explanatory drawing for demonstrating the effect | action of the pile main reinforcement which does not have a wide part. It is explanatory drawing for demonstrating the effect | action of the pile main reinforcement which has a wide part. It is front sectional drawing which shows the modification of the 1 pillar 1 pile-type foundation structure shown in FIG. It is a front sectional view showing the foundation structure of the 1 pillar 1 pile type concerning the 4th embodiment of the present invention. It is a top view at the time of seeing the joining unit of Drawing 14 from the upper part. It is a front sectional view showing the foundation structure of the 1 pillar 1 pile type concerning the 5th embodiment of the present invention. It is a figure which shows the assembly procedure of the foundation structure of 1 pillar 1 pile type shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head 1A Head upper end surface 2 Pile main reinforcement 2A Upper end part 3 Concrete pile 4 Joining unit 5 Concrete 7 Column 10 Bottom plate 11 Insertion hole 30 Welding part (fixing member)
31 Washer (fixing member)
40 Widened portion 50 Connecting hole 51 Anchor 100, 100A, 101, 101A, 102, 102A, 103, 104 1 pillar 1 pile type foundation structure

Claims (16)

On the upper side of the concrete pile head, a steel joining unit formed in a tubular shape is arranged,
A pile main bar upper end protruding from the head of the concrete pile and a lower end of a column erected upward are disposed inside the joint unit, and the pile main bar upper end of the concrete pile and the column. 1 pillar 1 pile type foundation structure characterized by being filled with concrete which fixes the lower end part of.   The one-column / one-pile-type foundation structure according to claim 1, wherein the joining unit includes a bottom plate, and the bottom plate is supported by an upper end surface of a head portion of the concrete pile.   The base of the 1 pillar 1 pile type | mold of Claim 2 by which the penetration hole by which the said pile main reinforcement upper end part protruded from the head of the said concrete pile was penetrated was formed in the bottom plate of the said joining unit. Construction.   The foundation of the 1 pillar 1 pile type | mold of Claim 3 with which the fixing member which fixes the pile main reinforcement upper end part of the said concrete pile penetrated by the said insertion hole is provided in the bottom plate of the said joining unit. Construction.   The bottom plate of the joining unit is provided with a communication hole through which the concrete placed in the joining unit can be circulated to the concrete pile side. 1 pillar 1 pile type foundation structure given in any 1 paragraph.   The bottom plate of the joining unit is provided with an anchor embedded in a head of the concrete pile so as to protrude downward. 6. 1 pillar and 1 pile type foundation structure.   The widening part formed so that it may be expanded as a width dimension larger than a diameter dimension is provided in the pile main reinforcement upper end part of the concrete pile located inside the said joining unit from Claim 1 characterized by the above-mentioned. Item 7. A one-column / one-stake foundation structure according to any one of items 6 to 9.   The pile main reinforcement upper end portion of the concrete pile located inside the joining unit is provided with a bent portion that is bent sideways or downward from a state of being extended upward. The one pillar 1 pile type foundation structure of any one of Claims 1-7. A steel joining unit formed in a cylindrical shape on the top side of the concrete pile is arranged so that an upper end portion of the pile main bar protruding from the head of the concrete pile is arranged inside,
After the column is erected upward with the lower end portion disposed inside the joining unit,
A construction method for a one-column / one-pile-type foundation structure, wherein concrete is filled into the joining unit to fix an upper end portion of a pile main bar of the concrete pile and a lower end portion of the column.   The one-column / one-pile-type foundation structure according to claim 9, wherein a unit having a bottom plate is used as the joining unit, and the bottom plate is supported by an upper end surface of a head portion of the concrete pile. Construction method.   As the joining unit, one having an insertion hole that communicates vertically with the bottom plate is used, and the joining unit is disposed by inserting the upper end of the pile main bar protruding from the head of the concrete pile into the insertion hole. The construction method of the foundation structure of the 1 pillar 1 pile type of Claim 10 characterized by the above-mentioned.   The pile main reinforcement upper end portion of the concrete pile inserted into the insertion hole of the bottom plate of the joining unit and the bottom plate are fixed by a fixing member. Construction method.   As the joining unit, one in which a communication hole communicating with the top and bottom is formed in the bottom plate is used, and when placing concrete in the joining unit, the concrete is circulated to the concrete pile side through the communication hole. The construction method of the 1 pillar 1 pile type foundation structure of any one of Claims 10-12 characterized by the above-mentioned. As the joining unit, an anchor is provided on the bottom plate so as to protrude downward,
The one-column / one-pile-type foundation structure according to any one of claims 10 to 13, wherein the joining unit is arranged so that the anchor is embedded in a head portion of the concrete pile. Construction method.   The widening part formed so that it may be expanded as a width dimension larger than a diameter dimension is provided in the pile main reinforcement upper end part of the concrete pile arrange | positioned inside the said joining unit, The Claims 9-14 characterized by the above-mentioned. The construction method of the 1 pillar 1 pile type foundation structure of any one of these.   10. The upper end of a main pile of a concrete pile disposed inside the joining unit is provided with a bent portion that is bent sideways or downward from a state extending upward. The construction method of the foundation structure of 1 pillar 1 pile type of any one of Claim 15.

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