JP2002030672A - Structure of joining foundation pile to pier base and method of constructing the structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for connecting a foundation pile to a pier base capable of easily performing the erecting operation of a column and a method of constructing the structure. SOLUTION: The pillar head surface 3a of the foundation pillar 3 is set at a position at least lower than the ground, a base plate 11 is fixed onto the pillar head surface 3a, and the pier base 8 is connected onto the base plate 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for directly connecting a column base of a superstructure in a building such as a building to a foundation pile, and a construction method thereof.

[0002]

2. Description of the Related Art Generally, in a building such as a building, an upper structure is supported on a foundation structure such as a pile foundation via footings and underground beams. By the way, in recent years, a construction method in which columns are directly connected to a pile foundation to support an upper structure has been adopted. According to this construction method, the footing and the underground beam can be omitted, and the cost and the construction period can be significantly reduced.

[0003] Fig. 7 shows an example of the structure of the joint portion when the pile foundation and the column are directly connected as described above. In the structure shown in FIG.
However, the upper end 102a is arranged so as to project from the pile head 103, and the hoop streak 104 is attached to the upper end 102a. And main line 1
The reinforcing steel pipe 106 is arranged so as to surround the reinforcing bar 105 composed of the upper end 102a of the 02 and the hoop bar 104, and the column 107 is erected at a position inside the reinforcing bar 105 on the pile head 103. Reinforced steel pipe 106
By casting concrete C into the inside, a joint structure 108 between the cast-in-place concrete pile 101 and the column 107 is constructed.

[0004]

However, in the joining structure 108 shown in FIG. 7, the lower end of the pillar 107 is buried in concrete in the ground, thereby making the pile head 1
03, which was not necessarily satisfactory in workability. Further, when the acting bending stress becomes large, the number of the main bars 102 needs to be increased, but in such a case, the reduction in workability has become more remarkable.

[0005] Further, when it is intended to adopt a method of assembling a part or the whole of the upper structure in advance and carrying in and installing it on the site, in the above-mentioned joint structure 108, the inside of the reinforcing rod cage 105 in the ground is required. It becomes difficult to insert the lower end of the pillar 107, which has been a bottleneck in adopting such a construction method.

The present invention has been made in view of such circumstances, and provides a joint structure between a foundation pile and a column base and a method of constructing the same, which can easily perform the work of erecting the column. The task is to

[0007]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The invention according to claim 1 is a structure for directly connecting a foundation pile and a column base of an upper structure, wherein a pile head surface of the foundation pile is installed at a position at least lower than the ground level, and A base plate is fixed on the head, and the column base is joined to the base plate.

[0008] With such a configuration, it is not necessary to bury the pillar base in the concrete in the ground when the pillar is erected.

According to a second aspect of the present invention, there is provided a joint structure between the foundation pile and the column base according to the first aspect, wherein the column base is formed of a steel frame material.

With this configuration, the column base can be easily fixed on the base plate.

[0011] The invention according to claim 3 is the invention according to claim 1 or 2.
The joint structure between the foundation pile and the column base portion according to the above, wherein an anchor bolt is driven into the pile head surface, a nut is screwed to a projecting upper end portion of the anchor bolt, and the base plate is In a state where the protruding upper end portion is inserted into a hole provided in the base plate, the protrusion is disposed above the nut, and between the base plate and the pile head surface,
It is characterized by being filled with grout material.

According to such a configuration, the position of the base plate can be easily adjusted by adjusting the position of the nut. Further, the column axial force acting on the base plate can be transmitted to the pile head via the grout material.

According to a fourth aspect of the present invention, there is provided a joint structure between the foundation pile according to any one of the first to third aspects and a column base, wherein the lower part of the foundation pile is formed by a cast-in-place concrete pile. And at least the upper end is formed of a steel pipe concrete pile.

With such a configuration, it is possible to ensure the bending strength of the pile head.

According to a fifth aspect of the present invention, there is provided a joint structure between a foundation pile and a column base according to the fourth aspect, wherein a reinforcing bar cage is provided so as to surround the column base portion, and concrete is provided on the reinforcing bar cage. Is cast, the column base is buried in the concrete, the lower end of the main reinforcement constituting the reinforcing steel cage is welded to the upper end edge of the steel pipe forming the steel pipe concrete pile. It is characterized by having.

With this configuration, the column base can be firmly fixed to the pile head, and the reinforcing work for securing the strength of the column base can be performed after the column base is joined. It becomes possible.

According to a sixth aspect of the present invention, there is provided a method for constructing a joint structure for directly connecting a foundation pile and a column base of an upper structure, wherein the foundation pile has a pile head surface of at least a ground level. Lower, and fixing the base plate on the pile head surface, and fixing the column base on the base plate, thereby erecting the column of the superstructure on the foundation pile. Features.

With such a configuration, the column base can be joined to the pile head without inserting the column base into the ground.

According to a seventh aspect of the present invention, there is provided the method for constructing a joint structure between a foundation pile and a column base according to the sixth aspect, wherein the base plate is fixed on the pile head surface. An anchor bolt is cast on the head surface, a nut is screwed onto a protruding upper end of the anchor bolt, and a portion of the protruding upper end above the position where the nut is screwed is formed in a hole provided in the base plate. Part, and adjusts the position of the nut to adjust the level of the base plate. Thereafter, a grout material is filled between the base plate and the pile head surface, thereby connecting the base plate to the pile. It is characterized by being fixed on the head.

According to such a configuration, the base plate can be fixed to the pile head surface in a state where the level of the base plate is adjusted.

The invention according to claim 8 is the invention according to claim 6 or 7.
A method for constructing a joint structure between a foundation pile and a column pedestal according to the above, wherein after fixing the column pedestal on the base plate, a reinforcing cage is fixed to the pile head surface so as to surround the column pedestal. It is characterized in that the column base is buried in concrete by arranging in a state and then casting concrete after constructing a formwork on the reinforced cage.

With such a configuration, the work of arranging reinforcing bars, formwork, and concrete for securing the bending strength of the column base can be performed after the column base is joined.

According to a ninth aspect of the present invention, there is provided a method for constructing a joint structure between a foundation pile and a column base according to any one of the sixth to eighth aspects, wherein the column base is fixed on the base plate. At this time, a frame constituting the upper structure is assembled at a different position in advance, the frame is transported to a position where the foundation pile is installed, and the frame is positioned so that the column base is located on the base plate. Is mounted.

With such a configuration, it is possible to construct a building in a short period of time, and there are few obstacles to the construction in that case.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is an enlarged view of a main part of a building 2 to which a joint structure 1 of a foundation pile and a column base according to an embodiment of the present invention is applied.

As shown in the figure, the building 2 has a structure in which an upper structure 4 is erected on a foundation pile 3. Superstructure 4
Is formed as a steel frame, is manufactured in blocks in a factory or the like, and is transported by the self-propelled trolley 5 to be transported to the site, that is, the installation target position of the foundation pile 3. , To be installed. The joint structure 1 is configured to directly connect the column base 8 of the column 7 of the upper structure 4 formed of a steel frame material to the pile head 6 of the foundation pile 3.

As shown in FIG. 6, the lower part of the foundation pile 3 is formed by a cast-in-place concrete pile 9 and the upper end thereof is formed by a steel pipe concrete pile 10.

FIG. 3 is an enlarged view of the joint structure 1. As shown in FIG. As shown in the figure, the pile head 3a of the foundation pile 3 is installed so as to be lower than the ground surface Gs. Also,
A base plate 11 is fixed to the pile head surface 3a, and a column base 8 formed of a steel frame material is joined to the base plate 11. The grout material 12 is filled between the base plate 11 and the pile head surface 3a.

The base plate 1 in this joint structure 1
1 and 2 are enlarged and shown in FIGS. As shown in FIG. 1, an anchor bolt 13 is cast on the pile head surface 3a, and the pile head surface 3a of the anchor bolt 13 is provided.
A nut 14 is screwed to a protruding upper end 13 a projecting from the nut 14, and the base plate 11 is installed above the nut 14.

As shown in FIG. 2, the base plate 11 is formed in a rectangular shape in a plan view, and has holes 15 at four corners thereof. It is inserted inside the part 15.

On the other hand, the column base 8 is formed of a steel member 16 made of a square steel pipe, and has an upper base plate 17 welded to the lower end of the steel member 16. The upper base plate 17 and the base plate 11 fixed to the pile head 6 are
The column base 8 is joined to the base plate 11 by being joined by the base plate 11.

As shown in FIG. 1, the anchoring rebar 1 is located below the base plate 11 on the pile head 3a.
9 are arranged. On the other hand, a stud bolt 20 is provided on the lower surface of the base plate 11 in a protruding state. Thereby, the base plate 11 is firmly fixed to the pile head surface 3a via the grout material 12.

Further, as shown in FIG. 3, a reinforcing cage 22 is installed around the column base 8. Then, the concrete C is cast into the rebar cage 22, whereby the joint structure 1 is formed in a state where the column base 8 is embedded in the concrete C.

Further, the main reinforcement 23 constituting the reinforcement cage 22
Is fixed to the upper end edge of the steel pipe 24 constituting the steel pipe concrete pile 10. FIG. 4 is an enlarged view showing the configuration of the joint between the lower end 23 a of the main bar 23 and the steel pipe 24. As shown in FIG.
A welding plate 25 is welded and fixed around a, and the upper surface 25a of the welding plate 25 and the upper edge 24a of the steel pipe 24 are formed by facing so as to form the same surface 26. The lower end 23a of the main reinforcement 23 is welded to the same surface 26 so that the lower end 23a of the main reinforcement 23 is
Is fixed to the steel pipe 24.

Next, a method of constructing the joint structure 1 will be described. For this purpose, first, as shown in FIG. 3, the foundation pile 3 is installed so that the pile head 3a is located lower than the ground surface Gs. At this time, steel pipe concrete pile 10
Before the concrete C inside hardens, the anchor bolts 13 are embedded in the pile head surface 3a, and the anchoring rebar 19 is positioned at a position surrounded by the anchor bolts 13.
Is embedded. On the other hand, the upper structure 4 is manufactured in blocks in a factory or the like.

After the concrete C of the steel pipe concrete pile 10 has hardened, the base plate 11 is fixed on the pile head 3a. To do this, first, anchor bolt 1
The nut 14 is screwed to the upper end 13a of the third protrusion. Further, the base plate 11 is disposed above the base plate 11, and the projecting upper end 13a of the anchor bolt 13 is inserted into the hole 15 of the base plate 11, thereby setting the base plate 11 above the position where the nut 14 is screwed. .

Next, the level of the base plate 11 is adjusted by adjusting the position of the nut 14 up and down. Then, by filling the grout material 12 between the base plate 11 and the pile head surface 3a whose level has been adjusted in this way, the base plate 11 is fixed to the pile head surface 3a.

As described above, the base plate 1 is mounted on the pile head 3a.
When the grout material 12 is hardened and the grout material 12 is hardened, the upper structure 4 manufactured in a factory or the like is transported to the site using a self-propelled bogie 5 as shown in FIG. The upper structure 4 is placed by jacking down the upper structure 4 so that the column base 8 of the upper structure 4 is located on the surface 3a. Further, the upper base plate 17 of the column base 8 is fixed to the base plate 11 using bolts 18.

Further, the reinforcing steel basket 2 surrounds the column base 8.
2 is arranged. To this end, as shown in FIG. 4, a welding plate 25 is fixed to the outer periphery of the upper end 24a of the steel pipe 24 constituting the steel pipe concrete pile 10, and the upper end 24a and the upper end 25a of the welding plate 25 are formed. The main reinforcement 23 is erected on the same surface 26 to be welded. Then, as shown in FIG.
To be installed.

Further, after the formwork is constructed on the reinforced cage 22, concrete C is cast, whereby the column base 8 is buried in the concrete to form the joint structure 1.
After that, the building 2 can be completed by finishing the upper structure 4.

In the above-described joint structure 1 and its construction method, the pile head 3a of the foundation pile 3 is installed at a position lower than the ground surface Gs, and the base plate 11 is fixed to the pile head 3a. Since the column base 8 of the upper structure 4 is directly joined to the structure, unlike the conventional case, when the column 7 is erected, it is necessary to bury the column base 8 in concrete in the ground and fix it. Disappears. Thereby, the work for erecting the columns 7 is facilitated, and the workability of the building 2 can be improved.

Further, in this case, since the column base 8 is formed of a steel frame material, the column base 8 can be easily joined to the base plate 11 and the workability is good.
In addition, this allows good application when the upper structure 2 is a steel frame, and particularly when the upper structure 2 is manufactured in a factory as in the present embodiment, the joining structure 1 can be favorably used. Applicable. Therefore, it is possible to contribute to shortening the construction period of the building 2.

In the joint structure 1 and the method of constructing the same, the anchor bolt 13 is cast on the pile head surface 3a, and the nut 1 is attached to the projecting upper end 13a of the anchor bolt 13.
4 and the base plate 11 is arranged above the nut 14 with the protruding upper end 13a inserted into the hole 15 so that the nut 14
By adjusting the vertical position of the base plate 11
Can easily be adjusted, whereby the installation accuracy of the pillar 7 can be easily secured. Further, in this case, since the grout material 12 is filled between the base plate 11 and the pile head surface 3a, the column axial force acting on the base plate 11 can be transmitted to the pile head surface 3a satisfactorily. With a proper construction, a highly stable structure can be realized.

In this joint structure 1, the foundation pile 3 is formed by a cast-in-place concrete pile 9 at the lower part and a steel pipe concrete pile 10 at the upper end.
, The bending strength of the pile head 6 can be ensured. In this case, unlike the conventional case, there is no need to dispose a large number of pile main bars, and the workability is also improved. Can be considered.

Further, in the above-mentioned joint structure 1, the reinforcing rod cage 22 is provided so as to surround the column base 8, and the concrete C is cast into the reinforcing rod cage 22. The lower end 23a of the main reinforcing bar 23 of the reinforcing steel cage 22 is formed in the steel pipe 2 forming the steel pipe concrete pile 10.
4 is welded to the upper edge 24a, so that the column base 8 can be firmly fixed to the pile head 6, and furthermore, they are integrated to ensure their bending strength. be able to. Thereby, a highly stable structure can be realized. Further, in this case, since it is possible to perform the reinforcing work of the reinforcing cage 22 after the work of erection of the pillar 7, it is possible to facilitate the construction, and to achieve both the structural stability and the workability. Becomes possible.

In the above-described method of constructing the joint structure 1, after the column base 8 is fixed on the base plate 11, the rebar cage 22 is disposed around the column base 8, and then the formwork is mounted on the rebar cage 22. After the construction, the concrete C is cast, so that, unlike the conventional method, the reinforcement, the formwork, and the concrete placing work for securing the bending strength of the column base 8 are performed after the standing work of the column 7. This makes it possible to greatly simplify the work of erection of the pillars 7 and the work of arranging reinforcing bars as compared with the related art.

Further, in the method of constructing the joint structure 1 described above, when fixing the column base 8 on the base plate 11, a steel frame constituting the upper structure 4 is assembled in a factory in advance, and this steel frame is assembled. Foundation pile 3
Is transported to the position where the steel plate is installed, and the steel frame is jacked down on the ground so that the column base 8 is located on the base plate 11, so that the building 2 can be constructed in a short time. At this time, since the pile head surface 3a does not protrude above the ground, there are few obstacles in transporting the steel frame using the self-propelled bogie 5, and it is necessary to bury the column base 8 in the ground. Because there is no jack, the steel frame can be easily jacked down.

In the above-described embodiment, the structure of the building 2 or the structure of the building 2 may be set without departing from the spirit of the present invention.
Another configuration may be adopted for the construction method or the like. For example, in the above embodiment, the upper structure 4 does not necessarily need to be manufactured in a factory, and may be constructed on site. Further, in the above embodiment, the position of the pile head surface 3a may be slightly protruding even on the ground surface Gs as long as it does not hinder the traveling of the self-propelled bogie 5.

[0049]

As described above, in the joint structure between the foundation pile and the column base according to the first aspect and the construction method according to the sixth aspect, when the column is erected, the column base is formed. There is no need to bury the concrete in the ground, and the work for erecting the pillars is facilitated, and the workability of the building can be improved.

According to the joint structure of the foundation pile and the column base according to the second aspect, since the column base is formed of a steel frame material, the column base can be easily joined to the base plate. And good workability. Also, such a configuration,
It is suitable when the upper structure is a steel frame, and can also be applied to the case where the upper structure is manufactured in a factory, thereby contributing to shortening the construction period of the building.

According to the joint structure between the foundation pile and the column base according to the third aspect and the construction method according to the seventh aspect, it is possible to easily adjust the level of the base plate by adjusting the position of the nut. This makes it possible to easily secure the installation accuracy of the pillar. In addition, since the grout material is filled between the base plate and the pile head surface, the column axial force acting on the base plate can be transmitted to the pile head surface satisfactorily. A high structure can be realized.

In the joint structure between a foundation pile and a column base according to a fourth aspect, the lower part of the foundation pile is formed by a cast-in-place concrete pile and the upper end is formed by a steel pipe concrete pile. Therefore, the bending strength of the pile head can be secured, and unlike the related art, there is no need to dispose a large number of pile main bars, and the workability is good.

In the joint structure of the foundation pile and the column base according to the fifth aspect, the column base can be firmly fixed to the pile head, and furthermore, these are integrated to reduce the bending strength. As a result, a highly stable structure can be realized. Further, in this case, since the reinforcing-bar cage arrangement work can be performed after the pillars are erected, the construction can be facilitated, and both structural stability and workability can be achieved.

In the method for constructing a joint structure between a foundation pile and a column pedestal according to claim 8, after the column pedestal is fixed on the base plate, a reinforcing steel cage is arranged around the column pedestal.
Since the concrete was cast after the formwork was constructed on the reinforced cage, unlike the conventional method, the reinforcement, formwork, and concrete placing work to secure the bending strength of the column pedestal were performed. This can be performed after the legs are installed, and the work of erection of the pillars and the work of arranging the reinforcing bars can be greatly facilitated as compared with the related art.

According to a ninth aspect of the present invention, in a method for constructing a joint structure between a foundation pile and a column base, a frame constituting an upper structure is formed by:
Assembled at a different location in advance, and the frame is transported to the position where the foundation pile is installed, and the frame is placed so that the column base is located on the base plate, so Construction of the building becomes possible. Also,
At this time, since the pile head surface does not protrude to the ground, there are few obstacles when transporting the frame, and since there is no need to bury the column base in the ground, the frame can be easily placed. It becomes possible.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a state in the vicinity of a base plate used in a joint structure between a foundation pile and a column base according to one embodiment of the present invention. FIG.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is an elevational sectional view showing the entire joint structure between the foundation pile and the column base shown in FIGS.

FIG. 4 is an enlarged sectional view showing a joint between a main reinforcing bar of a reinforcing cage and a steel pipe in FIG. 3;

FIG. 5 is a partially enlarged vertical sectional view of a building to which the present invention is applied.

FIG. 6 is an enlarged sectional view showing a foundation pile in a building to which the present invention is applied.

FIG. 7 is an enlarged sectional view showing a conventional joint structure between a pile foundation and a pillar.

[Explanation of symbols]

 Reference Signs List 1 joining structure 2 building 3 foundation pile 3a pile head 4 superstructure 6 pile head 7 pillar 8 column base 9 cast-in-place concrete pile 10 steel pipe concrete pile 11 base plate 12 grout material 13 anchor bolt 13a protruding upper end 14 nut 15 hole Part 16 Steel frame material 19 Anchored reinforcing bar 22 Rebar basket 23 Main reinforcing bar 23a Lower end 24 Steel pipe 24a Upper end

Claims (9)

[Claims] 1. A structure for directly connecting a foundation pile and a column base of a superstructure, wherein a pile head surface of the foundation pile is installed at a position lower than at least a ground level, and A base plate is fixed to the base plate, and the column base is bonded to the base plate. 2. The joint structure between a foundation pile and a column base according to claim 1, wherein the column base is formed of a steel frame material. Joint structure. 3. The joint structure between a foundation pile and a column base according to claim 1 or 2, wherein an anchor bolt is driven into the pile head, and a nut is mounted on a protruding upper end of the anchor bolt. While being screwed on,
The base plate is disposed above the nut with the protruding upper end portion being inserted into a hole provided in the base plate, and a grout material is filled between the base plate and the pile head surface. A joint structure between a foundation pile and a column base. 4. The joint structure between a foundation pile and a column base according to claim 1, wherein a lower portion of the foundation pile is formed by a cast-in-place concrete pile, A joint structure between a foundation pile and a column base, wherein an upper end is formed of a steel pipe concrete pile. 5. The joint structure between a foundation pile and a column base according to claim 4, wherein a reinforcing steel cage is provided so as to surround the column base, and concrete is cast into the reinforcing steel cage. Thereby, the column base is buried in concrete, and a lower end of a main reinforcing bar constituting the reinforcing steel cage is welded to an upper end edge of a steel pipe forming the steel pipe concrete pile. Connection structure between foundation pile and column base. 6. A method for constructing a joint structure for directly connecting a foundation pile and a column base part of a superstructure, wherein the foundation pile is positioned such that a pile head surface is at least lower than the ground level. A base plate fixed on the pile head surface, and the column base is fixed on the base plate, whereby the column of the upper structure is erected on the foundation pile. To build a joint structure between the column and the column base. 7. The method for constructing a joint structure between a foundation pile and a column base according to claim 6, wherein when fixing the base plate on the pile head,
An anchor bolt is driven into the pile head surface, a nut is screwed on a protruding upper end of the anchor bolt, and a portion of the protruding upper end above a position where the nut is screwed is provided on the base plate. The base plate is adjusted by adjusting the level of the base plate by adjusting the position of the nut, and thereafter, filling the grout material between the base plate and the pile head surface to thereby adjust the base plate. A method for constructing a joint structure between a foundation pile and a column base, wherein the joint structure is fixed on the pile head. 8. The method for constructing a joint structure between a foundation pile and a column base according to claim 6 or 7, wherein the column base is fixed on the base plate and then surrounds the column base. By arranging a reinforced car in a state fixed to the pile head surface, and then, after laying a formwork on the reinforced car and pouring concrete, embedding the column base in concrete. Construction method of joint structure between foundation pile and column base. 9. The method for constructing a joint structure between a foundation pile and a column base according to claim 6, wherein when fixing the column base on the base plate, the upper structure. Is assembled in a different position in advance, the frame is transported to a position where the foundation pile is installed, and the frame is placed on the base plate such that the column base is positioned. Construction method of joint structure between foundation pile and column base.