JPH108482A - Joined structure between construction center column and pile and posteriorly constructing method for construction center column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the setting length of a lateral center column by unitedly providing a horizontal plate on the pile head side of a lateral center column buriedly provided in a cast-in-place concrete pile, and erectedly providing a studbolt in a thin part at least lower than the horizontal plate of the lateral center column. SOLUTION: A horizontal plate 5 is joined near the pile head side 3 of a lateral center column 1. A stud bolt 6 is erectedly provided on the lower side of the horizontal plate 5. After a cast-in-place concrete pile 2 is previously drivenly provided in an underground excavated hole 7, the column 1 is inserted before hardening of concrete. In this case, the horizontal plate 5 provided on the column 1 carrys out bearing function against axial force acting from an upper structure to a concrete pile 2 to improve the transmitting function of the axial force. Thus, the setting length in the column leg part of the column can be shortened more, and the number of the stud bolts to be erectedly provided on the column can be more reduced in comparison with a usual case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a straight pillar and a pile in a reverse hitting method, and a post-building method for a straight pillar for constructing the joint structure.

[0002]

2. Description of the Related Art Conventionally, when erecting a steel column of a building main body on a cast-in-place concrete pile by a reverse-casting method, a beam or the like of the building main body on the ground is first constructed first. After excavating the lower part using this as a support, a basket-shaped reinforcing bar is built in the drilled underground hole,
Next, after inserting and arranging the leg portions of the straight pillar having a large number of stud bolts erected therein, the cast-in-place concrete is poured into the drilled hole, thereby forming the leg of the straight pillar. The construction method of integrating the part and the cast-in-place concrete pile was adopted.

[0003]

However, in the conventional method of joining a straight pillar and a pile in the above-described reverse striking method, after the straight pillar is erected in the drilled hole first,
Since the cast-in-place concrete is cast, when casting the concrete, there is a drawback that the basket-shaped rebar and the straight pillar connected to the basket-shaped rebar tend to swing and lower the building accuracy, As a result, there has been a problem that much labor is required to secure the accuracy of the construction of the straight pillar after the concrete is cast. In addition, in the joint structure between the straight pillar and the pile constructed in this way, in order to transmit the axial force from the upper structure to the reinforced concrete pile, the penetration length of the tall pillar is lengthened, There is a problem that a large number of stud bolts must be erected.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems associated with the joint structure between a trussed pillar and a pile in the conventional upside-down construction method and the prior construction method for the trussed pillar. The post-building makes it possible to easily erection of the trussed pillar on post-cast concrete piles with high construction accuracy, and it has excellent axial force transmission function and shortens the length of the trussed pillar. To provide a joint structure between a straight pillar and a pile capable of reducing the number of stud bolts to be erected and a post-building method for the straight pillar for constructing the joint structure It is assumed that.

[0005]

According to the first aspect of the present invention, there is provided a joint structure between a straight pillar and a pile according to the present invention, which is a joint structure between a straight pillar and a pile in a reverse-casting method. A horizontal plate having a vertically penetrating hole is integrally provided on the pile head side of the straight pillar buried in the pile, and at least a side portion of the straight pillar below the horizontal plate. A stud bolt is provided upright.

According to a second aspect of the present invention, there is provided a post-building method of a straight pillar according to the present invention, wherein a hole penetrating in a vertical direction is provided on a pile head side of a portion of the straight pillar to be embedded in a concrete pile in advance. The perforated horizontal plate is integrally joined, then the cast-in-place concrete of the pile is cast, and then the straight pillar is inserted to a predetermined level at which the horizontal plate is buried and integrated with the cast-in-place concrete pile. It is characterized in that

Further, according to the third aspect of the present invention, there is provided a post-building method of a straight pillar according to the present invention, wherein a hole penetrating in a vertical direction is provided on a pile head side of a portion of the straight pillar previously buried in a concrete pile. The perforated horizontal plates are integrally joined, and then the cast-in-place concrete of the pile is cast to the lower end level of the trussed pillar. Bearing, and then casting concrete to the upper end level where the horizontal plate is buried through the hole in the horizontal plate of the straight pillar, thereby integrating the straight pillar with the cast-in-place concrete pile. It is a feature.

[0008] The joint structure between the straight pillar and the pile according to claim 1 and the joint structure between the straight pillar and the pile constructed by the post-building method of the straight pillar according to claim 2 or 3 are described. Since the horizontal plate is integrally provided on the pile head side of the straight pillar, the horizontal plate performs a bearing function against the axial force acting on the pile from the upper structure. In order to greatly improve the function of transmitting the axial force from the trussed pillar to the cast-in-place concrete pile, compared to the conventional structure, the piercing length of the trussed pillar in the column base is made shorter, Further, it is possible to further reduce the number of stud bolts to be erected on the straight pillar.

[0009] In addition, the horizontal plate is provided on the pile head side of the straight pillar, and a hole is formed in the horizontal plate. When inserting the straight pillar into the precast cast-in-place concrete pile pillar, there is no possibility that the horizontal plate becomes a resistance, so that the straight pillar can be buried smoothly and with high accuracy in building. it can. In addition, when the horizontal plate is buried in the previously cast concrete, the concrete flows upward through the holes, so that no air is trapped on the lower surface side of the horizontal plate. Later, post-cast concrete can be cast at the upper end of the cast-in-place concrete pile using the hole of the horizontal plate.

[0010] Further, in the invention according to claim 3,
Since the cast-in-place concrete of the pile is once cast to the lower end level of the cast-in-place concrete column, and after the above-described cast-in-place column is supported by the joint surface of the cast-in-place concrete, the concrete is cast to the upper end level of the pile. There is no possibility that the timber pillar will swing, so that the timber pillar can be buried with high accuracy in the same manner. Moreover, when post-casting concrete to the upper end level of the pile, utilizing the hole of the horizontal plate of the straight pillar, for example, by inserting a tremy tube into the hole, the upper part of the joint surface is formed. Since the concrete can be cast, the casting operation can be simplified.

[0011]

1 and 2 show an embodiment of a joint structure between a straight pillar and a pile according to the present invention. In the drawings, reference numeral 1 in the drawing denotes a steel pillar of a building body. It is a pillar. The straight pillar 1 is a steel column crossed with an H-shaped steel. In the vicinity of a pile head 3 buried in a cast-in-place concrete pile 2, holes 4 penetrating vertically are drilled at four places. The provided horizontal plate 5 is integrally provided. A number of stud bolts 6 projecting outward from the flange 1a of the straight pillar 1 located below the horizontal plate 5 are provided upright.

Next, based on FIGS. 1 and 2, one embodiment of the method of post-building a straight pillar according to the present invention for constructing a joint structure between the straight pillar 1 and the pile 2 having the above-described structure. The form will be described. First, on the ground, concrete pile 2
The horizontal plate 5 is integrally joined at a position near the pile head 3 in a portion to be buried in the space, and the above-mentioned stud bolts 6 are erected below the horizontal plate 5. Then, after the cast-in-place concrete 2 of the pile is previously driven into the excavated underground hole 7, the horizontal plate 5 embeds the straight pillar 1 in the concrete pile 2 before hardening. Then, the cast-in-place concrete pile 2 is integrated with the cast-in-place concrete pile 2 by hardening the cast-in-place concrete pile 2.

In the joint structure of the straight pillar 1 and the cast-in-place concrete pile 2 thus constructed, the horizontal plate 5 is provided on the straight pillar 1 near the pile head 3. Since the horizontal plate 5 performs a bearing function against the axial force acting on the concrete pile 2 from the upper structure, the transmission function of the axial force can be improved. It is possible to further shorten the length of the pillars of the straight pillar 1 and to further reduce the number of stud bolts 6 to be erected on the straight pillar 1. By the way, when such a horizontal plate is provided at the lower end side of the straight beam column 1, when the straight beam column 1 is inserted into the precast cast-in-place concrete pile 2,
The horizontal plate becomes a large resistance, and as a result, there is a possibility that smooth insertion becomes difficult, or the straight pillar 1 oscillates and the building accuracy deteriorates.

In this regard, in the joint structure between the straight pillar 1 and the cast-in-place concrete pile 2, the horizontal plate 5
Is provided in the vicinity of the pile head 3 of the trussed pillar 1, so that when the trussed pillar is inserted into the cast-in-place concrete pile 2 to a predetermined level where the horizontal plate is buried, the horizontal plate 5 has a resistance. There is no risk of becoming
Can be buried smoothly and with high accuracy of construction. Moreover, since the holes 4 are formed in the horizontal plate 5, when the horizontal plate 5 is buried in the concrete pile 2 previously cast, concrete is passed upward through the holes 4. As a result, the above-described resistance can be reduced, and air does not accumulate on the lower surface side of the horizontal plate 5. In addition, after the straight pillar 1 is buried, a tremy tube is inserted into the holes 4 of the horizontal plate 5, for example.
There is an advantage that post-cast concrete can be cast at the upper end of the cast-in-place concrete pile 2.

Next, referring to FIGS. 3 and 4, another embodiment of the method of post-building a straight pillar according to the present invention will be described. Since the configuration of the straight pillar 1 is the same as that shown in FIGS. 1 and 2, the same reference numerals are given and the description is omitted. As shown in FIGS. 3 and 4, in this embodiment, in the same manner as in the above-described embodiment, a portion of the straight pillar 1 previously buried in the cast-in-place concrete pile 2 is located near the pile head 3. The horizontal plate 5 is interposed, and then the cast-in-place concrete 2 of the pile is pre-cast to the lower end level of the straight pillar 1. Next, the straight pillar 1 is lowered, and the cast-in-place concrete pile 2 is lowered.
After the bearing is carried out by the joint surface 8, a tremee pipe (not shown) is inserted into the hole 4 of the horizontal plate 5 of the straight pillar 1 to thereby reach the upper end level at which the horizontal plate 5 is buried. The concrete 2 and the cast-in-place concrete pile 2 are integrated by casting and hardening the concrete 2.

According to the post-building method of the straight-posted column 1, the cast-in-place concrete 2 of the pile is once driven to the lower end level of the straight-posted column 1, and the cast-in-place concrete column 1 is After mounting on the joint surface 8, the concrete pile 2
Since the concrete is cast to the upper end level, there is no possibility that the timber pillar 1 swings, and thus the timber pillar 1 can be similarly buried with high accuracy. Moreover,
When post-casting concrete to the upper end level of the cast-in-place concrete pile 2, the horizontal plate 5
Since the tremy tube can be inserted through the holes 4 and the concrete above the joint surface 8 can be cast, these casting operations can be simplified.

[0017]

As described above, the connecting structure of the straight pillar and the pile according to claim 1 and the straight pillar constructed by the post-building method of the straight pillar according to claim 2 or 3. According to the joint structure between the shaft and the pile, since the function of transmitting the axial force is improved by the horizontal plate, the insertion length of the column-base portion of the straight column is shortened, and furthermore, the straight column is connected to the straight column. The number of stud bolts to be erected can be reduced as compared with the conventional one, and according to the invention as set forth in claim 2, it is possible to embed the straight pillar smoothly and with high accuracy in building. According to the third aspect of the present invention, there is no danger of swinging of the timber pillar, and therefore, it is possible to obtain the effect that the timber pillar can be similarly buried with high accuracy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a joint structure between a straight pillar and a pile according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a longitudinal sectional view for explaining another embodiment of a post-building method of a straight pillar using the joint structure of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plume pillar 2 Cast-in-place concrete pile 3 Pile head 4 Hole 5 Horizontal plate 6 Stud bolt 8 Connection surface

Claims (3)

[Claims] 1. A joint structure between a straight pillar and a pile in a reverse driving method, wherein a hole penetrating vertically is formed in a pile head side of the straight pillar buried in a cast-in-place concrete pile. A joint structure between a straight pillar and a pile, wherein a stud bolt is erected on at least a side of the straight pillar below the horizontal plate. 2. A horizontal plate in which a hole penetrating in the vertical direction is integrally joined to a pile head side of a portion buried in a concrete pillar of a straight pillar in advance, A post-casting method for post-cast concrete columns, which comprises inserting the cast-in-place concrete to a predetermined level where the horizontal plate is buried, and integrating the cast-in-place concrete pile with the cast-in-place concrete pile. 3. A horizontal plate having a hole penetrating vertically is integrally joined to a pile head side of a portion buried in a concrete pillar of a straight pillar in advance, and then the pile is After casting the cast-in-place concrete to the lower end level of the cast-in-place concrete column, lower the cast-in-place column and support it with the joint surface of the cast-in-place concrete, and then insert the hole in the horizontal plate of the cast-in-place column. A method of post-building a trussed pillar, wherein the trussed pillar and the cast-in-place concrete pile are integrated by pouring concrete to an upper end level at which the horizontal plate is buried.