JP2013100673A - Structure and method for fixing steel pipe pile and column of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for fixing a steel pipe pile and a column of a structure in which the column of the structure can be fixed strongly to the steel pipe pile, further, a position of the column on the job site can be adjusted easily, and a process for constructing the foundation of the structure can be shortened.SOLUTION: A rectangular parallelepiped box body 9 is fixed to a proximal end of a column 6 of a structure. A bottom plate 15 of the box body 9 is bored with a pile insert hole 18 larger than the outer circumference of a steel pipe pile 1, and an upper plate 14 of the box body 9 is bored with mortar filling holes 16, 16. When fixing such a column 6 of the structure to the steel pipe pile 1 raised in the ground G, while inserting a proximal end of the steel pipe pile 1 from the pile insert hole 18 on the bottom plate 15 of the box body 9 into the box body 9, mortar is press-fitted from one mortar filling hole 16 on the upper plate 14 of the box body 9 into the box body 9, and the mortar is solidified together with the proximal end portion of the steel pipe pile 1.

Description

  TECHNICAL FIELD The present invention relates to a fixing structure (connecting structure) and a fixing method (connecting method) between a steel pipe pile and a building strut, which are used when a building pillar is built above a steel pipe pile standing on a soft ground. It is.

  As a method of building a building on a soft ground, a method is known in which a large number of steel pipe piles are set up in the ground and the foundation of the building is installed above the base ends of the steel pipe piles. In addition, when building a building above the steel pipe pile standing up in the ground, the building column is directly fixed directly above the steel pipe pile up in order to reduce the construction cost and shorten the construction period. The method is used.

  As a conventional method for directly fixing a structural column directly above an upright steel pipe pile, as in Patent Document 1, a rectangular pile head plate with a screw hole around it is used at the base end of the steel pipe pile. At the same time, a rectangular base plate with a perforated screw hole is fixed to the lower end of the pillar of the building, and after the steel pipe pile is set up, the base plate of the pillar of the building is brought into contact with the pile head plate of the steel pipe pile. A method is known in which the screw holes of both plates are matched and the plates are screwed together with bolts and nuts.

JP 2004-183266 A

  However, in the fixed structure of the steel pipe pile and the support column as described above, if a large force (bending moment) is applied to the connection part between the steel pipe pile and the support column, the base plate or the pile head plate bends or connects the two. There is a possibility that the connected bolt may be deformed and the connecting portion may be damaged. In addition, in the state that the pillar of the building is standing upright, the pillar cannot be fixed to the steel pipe pile unless the screw hole of the base plate of the pillar and the screw hole of the pile head plate of the steel pipe pile are precisely matched. There is a limit to the adjustment fee. Furthermore, when a steel pipe pile is stood diagonally with respect to the ground, it is difficult to fix the column so that it faces the correct vertical direction.

  An object of the present invention is to solve the problems of the conventional structure for fixing a steel pipe pile and a structure pillar, and to firmly fix the structure pillar to the steel pipe pile. It is an object of the present invention to provide a fixing structure and a fixing method of a steel pipe pile and a support of a building that can be easily adjusted in position and can shorten the construction foundation work process of the building.

  Of the present invention, the invention described in claim 1 is a construction method for a building in which a steel pipe pile is erected on the ground, and a pillar of the building is fixed to the upper end of the steel pipe pile. It is a fixing structure for fixing a pillar of an object, and a hollow box body in which an insertion port larger than the outer periphery of a steel pipe pile is drilled in a bottom plate and a mortar filling port is drilled in an upper plate is formed into a building column. The base end portion of the steel pipe pile fixed to the base end of the box body is inserted into the inside of the box body from the pile insertion port of the bottom plate of the box body, and the mortar filling port of the top plate of the box body The mortar pressed into the inside of the box is solidified together with the proximal end portion of the steel pipe pile.

  The invention described in claim 2 is the invention described in claim 1, wherein the plate member is fixed substantially horizontally to the upper end of the steel pipe pile, and the upper end of the steel pipe pile and the box body are attached to the plate member. A height adjusting bolt for adjusting the distance from the upper plate is screwed.

  In the invention described in claim 3, in the invention described in claim 1 or 2, the two mortar filling ports are point-symmetric with respect to the center of the upper plate on the upper surface of the box. It is characterized by being perforated.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, in order to reinforce the adhesion between the mortar filled in the box and the steel pipe pile, A reinforcing band is attached to the base end portion.

  According to a fifth aspect of the present invention, in the construction method for building a steel pipe pile, the steel pillar is set up on the ground, and the pillar of the building is fixed to the upper end of the steel pipe pile. A hollow box with an insertion port larger than the outer periphery of the steel pipe pile drilled in the bottom plate and a mortar filling port drilled in the top plate is fixed to the base end of the column of the building. In the state where the base end portion of the steel pipe pile set up on the ground is inserted into the inside of the box from the pile insertion port of the bottom plate of the box, the horizontal position is adjusted, and the top plate of the box is The mortar is press-fitted into the box from the mortar filling port, and the mortar is solidified together with the proximal end portion of the steel pipe pile.

  The fixing structure of the steel pipe pile according to claim 1 and the column of the building is to solidify the tip of the steel pipe pile together with the mortar in the box, and is supported by heavy equipment on the upper part of the steel pipe pile standing in the ground. When connecting and fixing the struts of a built building, the base end of the steel pipe pile and the tip of the strut of the building are slightly displaced in the horizontal plane direction, or the steel pipe pile is slightly inclined However, it is possible to fix the column of the building above the steel pipe pile so as to face the vertical direction. Therefore, according to the fixing structure of the first aspect, when the pillar of the building is connected and fixed to the upper part of the steel pipe pile, the position of the pillar can be easily adjusted at the work site. The construction foundation construction process can be shortened.

  Since the height adjusting bolt is screwed to the upper end of the upright steel pipe pile in the structure for fixing the steel pipe pile according to claim 2, the length of the height adjusting bolt (projecting) By changing the amount, the height and level of the box can be easily adjusted. Therefore, according to the fixed structure of the second aspect, it is possible to further reduce the construction foundation construction process of the building.

  According to the fixing structure of the steel pipe pile and the column of the building according to claim 3, the mortar is press-fitted from one mortar filling port and overflowed from the other (confirm overflow) into the box body. Since it is possible to spread the mortar without gaps, it is possible to fix the pillar of the building to the steel pipe pile very firmly.

  According to the fixing structure of the steel pipe pile and the support column of the building according to claim 4, the reinforcing strength can increase the fixing strength between the mortar in the box and the steel pipe pile. It is possible to further improve the fixing strength.

  According to the fixing method of the steel pipe pile and the support of the building according to claim 5, when connecting and fixing the support of the building supported by a heavy machine on the upper part of the steel pipe pile standing in the ground, Even if the base of the pile and the tip of the pillar of the building are slightly misaligned in the horizontal plane, or the steel pipe pile is slightly inclined, the steel pipe pile will be oriented vertically. Since the position adjustment of the support column at the work site can be easily performed, the construction foundation work process of the building can be shortened.

It is explanatory drawing which shows a steel pipe pile (a is a front view, b is a vertical sectional view, c is a perspective view). It is explanatory drawing which shows the support | pillar of a building (a is a perspective view which shows the lower end part of a support | pillar, b is a perspective view which shows a base board, c shows the state which fixed the base board to the lower end of a support | pillar. It is a perspective view). It is explanatory drawing which shows a box (a is a top view, b is a vertical sectional view, c is a perspective view). It is explanatory drawing which shows the state which made the box adhere to the lower end of a support | pillar (a is a top view and b is a perspective view). It is explanatory drawing (front view) which shows the state which stood the steel pipe pile in the ground. It is explanatory drawing (the steel pipe pile is a front view, a box is a vertical cross-sectional view) which shows the state which fixed the support | pillar of the building to the standing steel pipe pile. It is explanatory drawing (perspective view) which shows the state which fixed the support | pillar of the building to the standing steel pipe pile. It is explanatory drawing (front view) which shows the example of a change of a steel pipe pile. It is explanatory drawing (vertical sectional view seen from the front) which shows the example of a change of a steel pipe pile. It is explanatory drawing (vertical sectional view seen from the front) which shows the example of a change of a box.

  Hereinafter, the fixing structure and fixing method of the steel pipe pile of the present invention and the column of a building will be described in detail based on the drawings.

<Structure of steel pipe pile>
FIG. 1 shows an example of a steel pipe pile used for the fixed structure according to the present invention. The steel pipe pile 1 is formed in a long cylindrical shape having an outer diameter of about 267.4 mm (inner diameter of about 248.8 mm), a thickness of 9.3 mm, and a length of 6,000 mm. Moreover, the cover member 2 formed in the disk shape of thickness 25mm with steel is fixed to the upper end of the steel pipe pile 1 by welding. In the lid member 2, four bolt insertion holes 3, 3,... Are formed so as to form a square apex at an equal distance from the center. In each of the bolt insertion holes 3, 3,..., The height adjustment bolts (M24) 4, 4,. And is screwed by the nut 5. Each of the bolts 4, 4... And the nuts 5, 5.

<Structure of building support>
FIG. 2 (a) shows a column of a building, and the column 6 is a so-called H-shaped steel, the width of two flanges arranged in parallel is 300 mm, and the interval between the flanges Is 300 mm. The flange has a thickness of about 15 mm and the web has a thickness of about 10 mm.

  On the other hand, FIG. 2B shows a base plate fixed to the lower end of the column 6. The base plate 7 is formed in a rectangular shape of length (depth) × width (width) = about 300 mm × about 450 mm by cutting a steel plate having a thickness of about 25 mm. And four bolt insertion holes 8, 8,... Are formed at the edges of the left and right edges, respectively. The eight bolt insertion holes 8, 8,... Are arranged so as to be symmetrical with respect to the left and right center lines and the front and rear center lines of the base plate 7, respectively. As shown in FIG. 2C, the base plate 7 is fixed to the lower end of the column 6 by welding with the front and rear edges aligned with the front and rear positions of the flanges of the column 6, respectively. Has been. The four bolt insertion holes 8, 8... On the left and right sides of the base plate 7 are positioned inside and outside the web of the support 6 in front and behind.

<Box structure>
FIG. 3 shows a box to be fixed to the lower end of the column 6. The box 9 has a front plate 10, a rear plate 11, a left plate 12, and a right plate 13 formed in a rectangular shape by a steel plate having a thickness of about 16 mm and is welded in a quadrangular column shape. A top plate 14 formed in a rectangle (square) by a steel plate having a thickness of about 25 mm and a bottom plate 15 formed in a rectangle (square) by a steel plate having a thickness of about 16 mm are respectively formed in the opening and the lower opening. By welding, it is formed in a cubic shape of length (depth) × width (width of right and left) × height = about 500 mm × about 500 mm × about 500 mm. The box 9 is hot-dip galvanized on the surface and the inner surface for rust prevention.

  Further, circular mortar filling ports 16 and 16 each having a diameter of about 100 mm are formed at the front and rear edges of the upper plate 14 so as to be positioned at substantially the left and right centers, respectively. Further, between the mortar filling ports 16, 16, eight bolt insertion holes 17, 17... Are formed so as to be arranged in the same manner as the bolt insertion holes 8, 8. Has been. On the other hand, in the center of the bottom plate 15, a rectangular pile insertion port 18 having a side length of about 368 mm and longer than the outer diameter of the steel pipe pile 1 is drilled.

  As shown in FIG. 4, the box 9 described above has the upper plate 14 in contact with the back surface of the base plate 7 fixed to the lower end of the column 6 of the building, 17... Using the bolt insertion holes 8, 8... Of the base plate 7, using bolts (M24) 19, 19... And a nut 20, 20. The upper plate 14 and the base plate 7 are fixed to the lower end of the column 6 by screwing. The upper plate 14 and the base plate 7 are screwed together by using bolts 19, 19... With the head portion positioned on the lower side, bolt insertion holes 17, 17. It is carried out in such a manner that the nuts 20, 20 are fastened to the tips of the bolts 19, 19 through the insertion holes 8, 8,.

<Fixing between steel pipe piles and building columns>
In order to fix the steel pipe pile 1 configured as described above and the column 6 of the building, first, the steel pipe pile 1 is stood in the ground G as shown in FIG. In addition, as a method of standing up, it is possible to simply adopt a method in which the steel pipe pile 1 is driven or screwed into the ground G, but not only such a method but also excavating the ground G A vertical hole is formed, and in the vertical hole, the excavated current soil and cement-containing water are mixed to produce a cement-mixed soil. After the steel pipe pile 1 is set up in the cement-mixed soil, the steel pipe pile 1 is A method of solidifying cement-mixed soil can also be employed. Further, when the steel pipe pile 1 is stood up, a rectangular parallelepiped space S is formed around the base end of the steel pipe pile 1.

  After standing the steel pipe pile 1 in the ground G, a column (H-shaped steel) 6 having a box 9 fixed to the lower end via a base plate 7 is vertically suspended using heavy equipment, and FIG. 7, the base end (upper end) of the steel pipe pile 1 is inserted into the pile insertion port 18 of the bottom plate 15 of the box body 9, and the back surface of the upper plate 14 of the box body 9 is connected to the height adjustment bolt 4 of the steel pipe pile 1. The box 9 is placed on the base end of the steel pipe pile 1 so as to abut on the upper ends (tip surfaces of the threaded portions) of the steel pipe pile 1 (the base end of the steel pipe pile 1 is covered with the box 9). At that time, if the column 6 does not face the correct vertical direction, the column 6 is once lifted, the base end of the steel pipe pile 1 is taken out from the inside of the box 9, and the nut 5, 5.. Are rotated to adjust the amount of protrusion of the height adjusting bolts 4, 4... So that the column 6 is oriented in the correct vertical direction.

  As described above, after adjusting the protruding amount of the height adjusting bolts 4, 4... Of the steel pipe pile 1 so that the column 6 faces the vertical direction and covering the base end of the steel pipe pile 1 with the box 9, The space S around the box 9 is filled with earth and sand. Then, using a mortar pump vehicle or the like, mortar (for example, non-shrink mortar) is press-fitted into the inside of the box 9 from one mortar filling port 16 of the box 9 and the other (opposite side from the press-fitting side) To overflow from the mortar filling port 16 (confirm overflow). The space inside the box body 9 (the gap between the inner wall surface of the box body 9 and the steel pipe pile 1) is filled with the mortar by the press-fitting of the mortar. Thereafter, the mortar filled in the box body 9 is cured and solidified over a sufficient period of time to complete the fixing operation of the steel pipe pile 1 and the column 6.

<Effect of fixed structure>
The above-described fixing structure between the steel pipe pile 1 and the support pillar 6 of the building is such that an insertion port (pile insertion port 18) larger than the outer periphery of the steel pipe pile 1 is drilled in the bottom plate 15, and the mortar filling port 16, The hollow box body 9 having the holes 16 is fixed to the base end of the column 6 of the building, and the base end portion of the steel pipe pile 1 standing on the ground G is connected to the pile insertion port 18 of the bottom plate 15 of the box body 9. The mortar press-fitted into the inside of the box body 9 from the mortar filling port 16 of the upper plate 14 of the box body 9 in a state of being inserted into the inside of the box body 9 is solidified together with the proximal end portion of the steel pipe pile 1. Therefore, according to the said fixed structure, when connecting and fixing the support | pillar 6 of the building supported by the heavy machine to the upper part of the steel pipe pile 1 stood in the ground G, the base end of the steel pipe pile 1 and the building Even when the tip of the column 6 is slightly displaced in the horizontal plane direction or when the steel pipe pile 1 is slightly inclined, the column 6 of the building is fixed above the steel pipe pile 1 so as to face the vertical direction. Is possible. Therefore, it is possible to easily adjust the position of the strut 6 at the work site when connecting and fixing the strut 6 to the upper part of the steel pipe pile 1, thereby shortening the construction foundation work process of the building. can do.

  Moreover, the fixing structure of the above-mentioned steel pipe pile 1 and the support | pillar 6 of a building has the plate member (lid member 2) fixed substantially horizontally to the upper end of the standing steel pipe pile 1, Since the height adjusting bolts 4, 4,... For adjusting the distance between the upper end of the steel pipe pile 1 and the upper plate 14 of the box 9 are screwed, the height adjusting bolts 4, 4,. By changing the length (projection amount), the height and levelness of the box 9 can be easily adjusted. Therefore, according to the above-described fixing structure, it is possible to further shorten the construction foundation construction process of the building.

  Further, in the fixing structure of the steel pipe pile 1 and the support column 6 described above, the two mortar filling ports 16, 16... Therefore, it is possible to spread the mortar in the box 9 without any gap by press-fitting mortar from one mortar filling port 16 and overflowing from the other (confirm overflow). Therefore, the pillar 6 of the building can be fixed to the steel pipe pile 1 very firmly.

<Example of changing the fixed structure>
In addition, the structure of the fixing structure of the steel pipe pile and the support | pillar of a structure which concerns on this invention, and a fixing method is not limited to the aspect of each above-mentioned embodiment at all, A steel pipe pile, the support | pillar of a structure, a box The configuration of the shape and structure of the base plate can be appropriately changed as necessary without departing from the spirit of the present invention.

  For example, the steel pipe pile is not limited to a simple cylindrical shape as in the above-described embodiment, but is provided with a drilling bit attached to the tip, or a spiral so that a strip-like body protrudes in a substantially horizontal direction at the tip. It is also possible to change it to something wound in a shape.

  Further, the steel pipe pile is not limited to the one having a simple columnar base end as in the above-described embodiment. As shown in FIG. 8, the strip-shaped reinforcing bands 21 and 21 having a constant width are provided on the outer periphery near the base end edge. It is also possible to change to a wound (wound and welded). When such a configuration is adopted, the surface area of the outer periphery of the base end of the steel pipe pile increases, so that the adhesion strength between the mortar in the box and the steel pipe pile can be increased. It is possible to further improve the fixing strength (connection strength).

  Further, the steel pipe pile is not limited to the height adjustment bolt attached to the lid member so that the head portion is located on the lower side as in the above embodiment, and the height adjustment is performed so that the head portion is located on the upper side. While attaching a bolt to a cover member, it is also possible to change it to what welded a nut member to the back of a cover member. When such a configuration is adopted, there is an advantage that the adjustment of the height adjusting bolt for directing the support column in the correct vertical direction becomes easier.

  Further, the steel pipe pile is not limited to the one in which the height adjusting bolt protrudes upward only from the upper surface inside the cylinder as in the above embodiment, and as shown in FIG. It is also possible to weld to the upper end and change the height adjustment bolts 4, 4... To protrude upward from the outer side of the column of the plate member 2 ′. When such a configuration is adopted, there is a merit that the adjustment of the height adjusting bolt becomes easier.

  On the other hand, the hollow box to be fixed to the lower end of the column is not limited to a rectangular parallelepiped (including a cubic shape), and can be changed to a cylindrical shape, a prismatic shape, or the like. Further, the inner wall surface is not limited to a flat one as in the above embodiment, and the inner wall surface is modified to have a rectangular parallelepiped-like projection body 22, 22 as shown in FIG. It is also possible. When such a configuration is adopted, the surface area inside the box increases and the bond strength between the box and mortar increases, so the bond strength (connection strength) between the pillars of the building and the steel pipe piles is further improved. There is a merit to do.

  Further, the hollow box is not limited to the one in which a rectangular insertion port (pile insertion port) is formed in the bottom plate as in the above embodiment, but a circular shape (a circular shape whose diameter is larger than the outer diameter of the steel pipe pile), an oval shape The bottom plate is drilled with an insertion port of a shape (oval whose minor axis is larger than the outer diameter of the steel pipe pile) or a polygon other than a rectangle (polygon that can form a fixed gap with the inserted steel pipe pile) It is also possible to change to something. Furthermore, it is not limited to the two mortar filling ports arranged at the center of the edge of the two opposing edges of the upper plate, and the two mortar filling ports arranged on the diagonal of the upper plate, etc. It is also possible to change to.

  In addition, the structure for fixing the steel pipe pile and the support of the building according to the present invention is not limited to a structure in which one support is fixed (connected) to one steel pipe pile as in the above-described embodiment. It is also possible to change to a structure in which a single column is fixed to a plurality of standing steel pipe piles. In addition, depending on the application, it is possible to make the base end of the steel pipe pile to stand up into a bifurcated or trifurcated structure, and to fix one post to each base end.

  In addition, the column of the building fixed by the fixing structure according to the present invention is not limited to the H-shaped steel as in the above embodiment, but is changed to one having another shape such as L-shaped steel or I-shaped steel. It is also possible.

  Since the fixing structure of the steel pipe pile and the support of the building according to the present invention has an excellent effect as described above, it can be suitably used when constructing foundations of various buildings.

1. Steel pipe pile 2. Lid member (plate member)
4. ・ Height adjustment bolt 6. ・ Building support 9. ・ Box 14 ・ ・ Top plate 15. ・ Bottom plate 16. ・ Mortar filling port 18. ・ Pile insertion port (insertion port)

Claims (5)

In the construction method of building a steel pipe pile upright on the ground, and fixing the pillar of the building to the upper end of the steel pipe pile, it is a fixing structure for fixing the pillar of the building to the upper end of the steel pipe pile,
A hollow box body with an insertion port larger than the outer periphery of the steel pipe pile drilled in the bottom plate and a mortar filling port drilled in the upper plate is fixed to the base end of the building column,
The base end portion of the steel pipe pile standing on the ground is inserted into the inside of the box from the pile insertion port of the bottom plate of the box into the inside of the box, and is pressed into the inside of the box from the mortar filling port of the top plate of the box. A fixed structure between a steel pipe pile and a column of a building, characterized by solidifying the mortar together with the proximal end portion of the steel pipe pile.   A plate member is fixed substantially horizontally to the upper end of the steel pipe pile, and a height adjustment bolt for adjusting the distance between the upper end of the steel pipe pile and the upper plate of the box is screwed to the plate member. The fixed structure of the steel pipe pile and the support | pillar of a structure of Claim 1 characterized by the above-mentioned.   The steel pipe pile according to claim 1 or 2, wherein two mortar filling ports are formed in the upper surface of the box so as to be point-symmetric with respect to the center of the upper plate. Fixed structure with the structure pillar.   The reinforcing band is attached to the base end part of the steel pipe pile in order to reinforce the adhesive force between the mortar filled in the box and the steel pipe pile. Fixed structure of steel pipe pile and building support. In the construction method of building a steel pipe pile standing on the ground and fixing the building pillar to the upper end of the steel pipe pile, the fixing method for fixing the building pillar to the upper end of the steel pipe pile,
A hollow box body with an insertion port larger than the outer periphery of the steel pipe pile drilled in the bottom plate and a mortar filling port drilled in the upper plate is fixed to the base end of the building column,
In the state where the base end portion of the steel pipe pile standing on the ground is inserted into the box body from the pile insertion port of the bottom plate of the box body, the horizontal position is adjusted, and the mortar filling of the top plate of the box body is performed A method for fixing a steel pipe pile and a column of a building, wherein the mortar is pressed into the box body from the mouth and the mortar is solidified together with the proximal end portion of the steel pipe pile.

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