JP2007255006A - Method of joining steel column and precast pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of joining a steel column and a precast pile shortening a construction period and reducing cost by dispensing with a base plate, an anchor frame, or the like unlike a conventional method and absorbing a construction error of the precast pile in a reliable manner to improve work efficiency. <P>SOLUTION: In the method of joining the steel column and the precast pile, an erection frame comprising vertical frames, a lower frame and an upper frame is installed in a predetermined horizontal position of the upper end of the precast pile. A plurality of first main reinforcements and a plurality of second main reinforcements shorter than the first main reinforcements are fixed to the upper end of the precast pile, and after winding hoops, concrete is placed to the lower part of the upper frame. After erecting the steel column to be inserted in the erection frame, third main reinforcements are joined to the second main reinforcements, and the hoops are wound. Concrete is then placed above the upper frame. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for joining a steel column and a ready-made pile.

Conventionally, the technique which joins the pile and pillar of a building via a foundation is known (for example, refer to patent documents 1).
In the case of embedding a steel pipe pile just below the column base as in the technique described in Patent Document 1, after constructing the pile head reinforcing portion, an anchor frame is installed on the upper surface of the pile head reinforcing portion and the column base anchor is installed. Bolts are erected and concrete of the foundation beam part including the column base part is placed to construct the foundation beam part.

  However, in the technique described in Patent Document 1, the construction method is large-scale, such as concrete must be placed in a wide area such as pile head reinforcement and foundation beam. There was a problem of becoming high.

  In addition, a grout material such as mortar is injected into the gap between the base plate and the foundation, so that the coupling strength of the column base can be improved. However, since such a mortar is filled in a narrow space between the base plate and the foundation, there is a problem that it is difficult to visually confirm the filled state particularly in a deep part.

  Therefore, by performing the column construction work without using a base plate or anchor bolts as in the technique described in Patent Document 1, the work period is shortened, the cost is reduced, and the workability is improved. Development of a technology that can be solved has been desired.

And in response to such a request, in recent years, a construction method in which a foundation is omitted and a pile and a column are directly joined has been attempted (for example, see Patent Document 2).
The technique described in Patent Document 2 inserts a column base portion of a column into a hollow pile head of a ready-made pile, and fills the hollow pile head with a filler such as concrete, so that the ready-made pile and the column are filled. It is a technology for rigid joining.
Japanese Patent No. 2516653 JP 2004-238927 A

However, in the case of the technique as described in Patent Document 2, a construction error may occur depending on the ground condition or the construction method when a ready-made pile is placed.
When construction errors occur in this way, when inserting the column into the pile head of the ready-made pile, for example, the column is caught on the edge of the pile head, the column cannot be inserted to a predetermined depth, etc. In some cases, it was difficult to insert a column into the pile head of a ready-made pile.
And when a column (hereinafter referred to as a steel column) could not be inserted into the pile head of the ready-made pile, it could take time, such as redoing the ready-made pile, so the construction error of the ready-made pile was reduced. There has been a demand for the development of a technique that can reliably absorb and improve workability.

  Unlike the prior art, the present invention eliminates the need for a base plate, an anchor frame, etc., and can shorten the construction period and reduce costs, and can reliably absorb construction errors of ready-made piles, thereby improving workability. It aims at providing the joining method of the steel column and ready-made pile which can plan.

The invention according to claim 1 is, for example, as shown in FIG. 1 and FIG. 2 (a), (b), in the method of joining the steel column 1 and the ready-made pile 2,
A building frame 3 having a vertically long vertical frame 3a and a lower frame 3b fixed to the lower end of the vertical frame 3a is fixed to the upper end surface of the ready-made pile 2. By installing in the predetermined horizontal position of the upper end part of the said ready-made pile 2,
Further, the upper frame 3c is fixed at a predetermined height position of the vertical frame 3a,
Next, a plurality of first main bars 4 and a plurality of second main bars 5 shorter than the first main bars 4 are fixed to the upper end portion of the ready-made pile 2, so that the steel column is above the second main bars 5. After forming the building space 5a and winding the band 7 around the first and second main bars 4 and 5, the concrete 8 is placed to the lower part of the upper frame 3c,
Next, the steel column 1 is built in the inner hollow portion 1a so that the vertical frame 3a of the building frame 3 is inserted along the inner surface 1b of the inner hollow portion 1a. The lower end of the pillar 1 is fixed in contact with the upper frame 3c,
Thereafter, the third principal muscle 6 is joined to the second principal muscle 5 so as to have the same length as the first principal muscle 4, and the band 9 is wound around the first principal muscle 4 and the third principal muscle 6, and the upper The concrete 10 is placed above the frame 3c.

According to the invention described in claim 1, by installing a building frame including the vertical frame and the lower frame at a predetermined horizontal position of the upper end portion of the ready-made pile, Since the built-in position of the steel column can be adjusted in the horizontal direction according to the installation position, construction errors in the horizontal direction of the ready-made piles can be absorbed easily and reliably.
In addition, by fixing the upper frame at a predetermined height position of the vertical frame, the built-in position of the steel column can be adjusted in the vertical direction according to the installation position of the upper frame. Construction errors in the vertical direction of the pile can be absorbed easily and reliably.
That is, by using such a building frame, it is possible to easily and reliably absorb construction errors that occur when placing ready-made piles, so that it is possible to improve workability.

  Furthermore, the first main bar and the second main bar having different lengths are fixed to the upper end portion of the ready-made pile, and a space for building a steel column is formed above the second main bar shorter than the first main bar. Can secure a working space, and it is easy to build a steel column. Therefore, the workability can be improved.

  Moreover, after winding a strip on the 1st and 2nd main reinforcement fixed to the upper end part of the said ready-made pile, by placing concrete to the lower part of the said upper frame, it is in the position which can absorb the construction error of a ready-made pile. The installed frame for construction can be firmly fixed to the upper end of the ready-made pile.

On the other hand, during the construction work of the steel column, the steel column is built in such a manner that the vertical frame of the building frame is inserted along the inner surface of the internal hollow part in the internal hollow part. Since the vertical frame can be used as a guide, it is easy to install.
Moreover, since the said vertical frame is inserted along the inner surface of the internal hollow part of a steel column, the shift | offset | difference etc. of the construction position of a steel column can be prevented.

  Then, the third main bar was joined to the second main bar, the band was wound around the first main bar and the third main bar, and the concrete was placed by placing concrete above the upper frame. The steel column can be firmly fixed to the vertical frame of the building frame, and the steel column and the ready-made pile can be bonded firmly via the building frame.

  Also, unlike conventional ones, by joining steel columns and ready-made piles without using a base plate, anchor frame, etc., the construction of the steel columns can be facilitated, which can lead to a reduction in construction period and cost. Therefore, it becomes possible to improve workability.

  In the invention according to claim 2, for example, as shown in FIG. 1, a protruding portion 1c is provided on the outer surface of the lower end portion of the steel column 1, and the protruding portion 1c is fixed in contact with the upper frame 3c. It is characterized by.

  According to invention of Claim 2, the said steel column and the frame for construction are firmly connected by abutting and fixing the protrusion provided in the lower end part outer surface of the said steel column to the said upper frame. Therefore, the steel column and the ready-made pile can be firmly joined via the building frame.

  The invention according to claim 3 is characterized in that, for example, as shown in FIG. 1, a plurality of reinforcing pieces 1 d are provided on the side surface of the steel column 1 at a predetermined interval along the longitudinal direction of the steel column 1. To do.

  According to the third aspect of the present invention, the steel column can be reinforced by providing a plurality of reinforcing pieces at predetermined intervals along the longitudinal direction of the steel column on the side surface of the steel column. The steel column can be prevented from being deformed when an external force is applied. As a result, for example, it is possible to omit the work of pouring concrete into the internal hollow portion of the steel column and reinforcing the steel column, thereby improving workability.

  According to the present invention, unlike the prior art, it is possible to reduce the work period and cost by eliminating the need for a base plate, an anchor frame, etc., and to easily and reliably absorb construction errors that occur when placing ready-made piles. This makes it possible to improve the workability.

  Hereinafter, an embodiment of a method for joining a steel column 1 and a ready-made pile 2 according to the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view showing a joining mode of a steel column 1 and a ready-made pile 2, and a steel column 1, a ready-made pile 2 embedded in the ground, and a steel column 1 is built at the upper end of the ready-made pile 2. It is composed of a frame 3 for building and a reinforced concrete that wraps around the steel column 1.
2A is a plan sectional view in which the lower frame 3b of the construction frame 3 is fixed to the upper end surface of the ready-made pile 2, and FIG. 2B shows the lower end portion of the steel column 1 as the construction frame. 3 is a plan cross-sectional view of a portion brought into contact with the upper frame 3c of FIG.

  Here, a steel pipe column formed in a hollow shape is adopted as the steel column 1 of the present embodiment, and as shown in FIGS. 1 and 2 (b), a protruding portion 1c is provided on the outer surface of the lower end portion. Yes. A plurality of reinforcing pieces 1d are provided on the side surface of the steel column 1 at predetermined intervals along the longitudinal direction of the steel column.

The ready-made pile 2 is formed in a hollow cylindrical shape as shown in FIG. Further, concrete 20 is filled in the upper portion of the hollow portion 2b, so that the upper end portion of the ready-made pile 2 can be reinforced and the driving performance can be improved.
A steel plate 2 a having the same diameter as that of the upper end surface is fixed to the upper end surface of the ready-made pile 2. The hollow portion 2b of the ready-made pile 2 may be filled with cement or the like.

  As shown in FIGS. 1 and 2 (a) and 2 (b), the building frame 3 includes a vertically long vertical frame 3a and a lower frame 3b fixed to a lower end portion of the vertical frame 3a. The upper frame 3c is fixed to a predetermined height position of the vertical frame 3a, and an angle material having an L-shaped cross section is adopted as each of the frame materials.

The vertical frame 3a is provided with a plurality of angles such that one plate portion of the angle is along the inner surface 1b of the inner hollow portion 1a of the steel column 1 and the other plate portion is directed toward the center of the inner hollow portion 1a. The lower frame 3b is provided in a plurality of orientations such that one plate portion of the angle is in contact with the vertical frame 3a and the other plate portion is in contact with the upper end surface of the ready-made pile 2.
The vertical frame 3a and the lower frame 3b may be fixed in advance. Further, it is preferable that one of the lower frames 3b is made of a slightly longer angle member so that the building frame 3 can be stably erected.

  Further, the upper frame 3 c is provided in a plurality of orientations such that one plate portion of the angle is in contact with the vertical frame 3 a and the other plate portion is in contact with the lower end portion of the steel column 1. As will be described later, the upper frame 3c is provided after the mounting positions of the vertical frame 3a and the lower frame 3b are determined.

  The reinforced concrete includes a first main reinforcement 4 fixed to the upper end of the ready-made pile 2, a second main reinforcement 5 fixed to the upper end of the ready-made pile 2 and formed shorter than the first main reinforcement 4, and a post-process. A third main reinforcement 6 joined to the second main reinforcement 5, strips 7 and 9 wound around the main reinforcements 4, 5 and 6, and concrete 8 and 10 are configured.

  Moreover, although the said 2nd main reinforcement 5 is formed shorter than the 1st main reinforcement 4, it comes to be able to form the space 5a for steel frame construction above this 2nd main reinforcement 5. Yes.

  On the other hand, as shown in FIG. 1, the first and second main bars 4, 5 are provided with their lower ends fixed to a reinforcing band 21 provided at the upper end of the ready-made pile 2. The reinforcing band 21 is provided to reinforce the ready-made pile 2 and improve the driving performance.

  Further, the third principal muscle 6 is set to be approximately the same length as the first principal muscle 4 by being spliced to the second principal muscle 5. In addition, although the joining of the 2nd main reinforcement 5 and the 3rd main reinforcement 6 in this Embodiment is performed by the mechanical coupling 11, it is not restricted to this, You may join by gas pressure welding, welding, etc.

  When placing the concrete 8, 10, the concrete placing operation is performed after forming a mold around the steel column 1 (not shown).

  Next, in order to join the steel column 1 and the ready-made pile 2, as shown in FIG. 1 and FIGS. 2 (a) and 2 (b), first, a vertically long vertical frame 3a and the vertical frame By fixing the lower frame 3b to the upper end surface of the ready-made pile 2, the predetermined frame of the upper end of the ready-made pile 2 is fixed to the building frame 3 provided with the lower frame 3b fixed to the lower end of 3a. Install in a horizontal position.

  That is, the construction frame 3 provided with the vertical frame 3a and the lower frame 3b is installed at a predetermined horizontal position of the upper end portion of the ready-made pile 2 to match the installation position of the construction frame 3. Since the position where the steel column 1 is built can be adjusted in the horizontal direction, construction errors in the horizontal direction of the ready-made pile 2 can be easily and reliably absorbed.

Further, as shown in FIG. 1, the upper frame 3c is fixed at a predetermined height position of the vertical frame 3a.
In this way, by fixing the upper frame 3c at a predetermined height position of the vertical frame 3a, the built-in position of the steel column 1 can be adjusted in the vertical direction according to the installation position of the upper frame 3c. Since it can do, the construction error in the perpendicular direction of the ready-made pile 2 can be absorbed easily and reliably.

  Next, a plurality of first main bars 4 and a plurality of second main bars 5 shorter than the first main bars 4 are fixed to the upper end portion of the ready-made pile 2, so that the steel column is above the second main bars 5. A building space 5a is formed.

  And the 1st main reinforcement 4 and the 2nd main reinforcement 5 which differ in length to the upper end part of the said ready-made pile 2 are fixed in this way, and it is for steel column construction above the 2nd main reinforcement 5 shorter than this 1st main reinforcement 4. By forming the space 5a, a space where a person can work can be secured, and the steel column 1 can be easily built. Therefore, it is possible to improve the workability.

Subsequently, as shown in FIG. 1, after the band 7 is wound around the first and second main bars 4, 5, the concrete 8 is placed to the lower part of the upper frame 3 c.
As a result, the building frame 3 installed at a position where the construction error of the ready-made pile 2 can be absorbed can be firmly fixed to the upper end portion of the ready-made pile 2, and the building method of the steel column 1 can be fixed at a time. It can be carried out.

  Next, as shown in FIGS. 1 to 2 (a) and 2 (b), the vertical column 3a of the building frame 3 is placed in the inner hollow portion 1a of the steel column 1 in the inner hollow portion 1a. It is built so as to be inserted along the inner surface 1b, and the lower end portion of the steel column 1 is brought into contact with and fixed to the upper frame 3c.

That is, since the vertical frame 3a can be used as a guide during the construction work of the steel column 1, the construction is facilitated.
Moreover, since the said vertical frame 3a is inserted along the inner surface 1b of the internal hollow part 1a of the steel column 1, the shift | offset | difference etc. of the construction position of the steel column 1 can be prevented.

At this time, the protruding portion 1c provided on the outer surface of the lower end portion of the steel column 1 is fixed in contact with the upper frame 3c. As a result, the steel column 1 and the building frame 3 can be firmly connected.
In addition, a plurality of reinforcing pieces 1d are provided on the side surface of the steel column 1 at predetermined intervals along the longitudinal direction of the steel column 1, and the steel column 1 is reinforced by the reinforcing pieces 1d. . As a result, deformation of the steel column 1 when an external force is applied can be prevented. For example, the work such as pouring concrete into the internal hollow portion 1a of the steel column 1 to reinforce the steel column 1 is omitted. Therefore, it becomes possible to improve the workability.

  Thereafter, as shown in FIG. 1, the third principal muscle 6 is joined to the second principal muscle 5 so as to have the same length as that of the first principal muscle 4, and a band 9 is provided on the first principal muscle 4 and the third principal muscle 6. Winding is performed, and the concrete 10 is placed above the upper frame 3c.

  In addition, the third main reinforcement 6 is joined to the second main reinforcement 5 in this way, the band 9 is wound around the first main reinforcement 4 and the third main reinforcement 6, and the concrete 10 is disposed above the upper frame 3c. Can be firmly fixed to the vertical frame 3a of the frame 3 for construction.

According to the present embodiment, by using the building frame 3, it is possible to easily and surely absorb the construction error that occurs when the ready-made pile 2 is placed, so that the workability can be improved. It becomes possible.
Also, unlike the conventional case, by joining the steel column 1 and the ready-made pile 2 without using a base plate or an anchor frame, the construction of the steel column 1 is facilitated, thereby reducing the construction period and cost. Since it can be performed, it becomes possible to improve workability.

It is a sectional side view which shows the joining aspect of a steel column and a ready-made pile. (A) is sectional drawing in the AA line of FIG. 1, (b) is sectional drawing in the BB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel column 2 Ready-made pile 3 Construction frame 3a Vertical frame 3b Lower frame 3c Upper frame 4 1st main reinforcement 5 2nd main reinforcement 6 3rd main reinforcement 7 Band 8 Concrete 9 Band 10 Concrete

Claims (3)

In the method of joining steel columns and ready-made piles,
By fixing the lower frame to the upper end surface of the ready-made pile, the ready-made pile is provided with a vertical frame that is vertically long and a lower frame fixed to the lower end of the vertical frame. Installed at a predetermined horizontal position at the upper end of the
Furthermore, the upper frame is fixed at a predetermined height position of the vertical frame,
Next, by fixing a plurality of first main bars and a plurality of second main bars shorter than the first main bars to the upper end of the ready-made pile, a space for building a steel column is formed above the second main bars. After forming and further winding a band around these first and second main bars, placing concrete to the lower part of the upper frame,
Next, the steel column is built so that the vertical frame of the building frame is inserted along the inner surface of the internal hollow portion in the internal hollow portion, and the lower end portion of the steel column is Abutting and fixing to the upper frame,
After that, the third main bar is joined to the second main bar so as to have the same length as the first main bar, and strips are wound around the first main bar and the third main bar, and the concrete is further above the upper frame. A method of joining a steel column and a ready-made pile, characterized by placing   The method of joining a steel column and a ready-made pile according to claim 1, wherein a protrusion is provided on the outer surface of the lower end of the steel column, and the protrusion is in contact with and fixed to the upper frame.   The method of joining a steel column and a ready-made pile according to claim 1 or 2, wherein a plurality of reinforcing pieces are provided at predetermined intervals along a longitudinal direction of the steel column on a side surface of the steel column.

Images