Joint method between piles and superstructure

Abstract

To provide a jointing method of a pile and a superstructure reduced in a construction period by simplifying error correction work of the vertical direction of the pile and centering work of the pile and the superstructure.SOLUTION: In a jointing method, piles 1 (concrete piles) erected into ground 2 are jointed to a cap steel pipe 15 provided with a base plate 17 jointed with the lower end of a column 18 (superstructure) at an upper end and arranged by covering around a head part of the pile. An erection tool 10 is fixed to the head part of the pile. Then, the position in the vertical and horizontal directions of the base plate supported by the erection tool is adjusted. Then, the base plate finished in the positional adjustment of the vertical and horizontal directions is fixed to the erection tool. Then, filler 20 is filled inside the cap steel pipe and on the outer periphery of the pile via a filling hole 17b provided in the base plate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for connecting a pile set into the ground to a superstructure of an architectural structure or a civil engineering structure. [Background technology]

[0002] Conventionally, the method of connecting a pile set into the ground to a column (superstructure) of an architectural structure involved installing a footing on the top of the pile, fixing an anchor bolt to the footing, and then fixing a base plate at the bottom of the column to the anchor bolt. In contrast to this conventional construction method, a construction method has been developed in which columns are fixed directly to piles without constructing a footing (for example, Patent Document 1). The construction method for joining a pile and a superstructure in Patent Document 1 involves installing a vertical position adjustment fitting at the top of the pile head, covering the vertical position adjustment fitting with a joining jig with a cap structure at the bottom end of the column, and then filling the inside of the joining jig with concrete to secure it in place. The vertical position adjustment fitting has a flat top surface and legs, and the sides are formed in an approximately U-shape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-9438 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, piles that are set into the ground are subject to installation errors in the vertical direction, and the construction method of Patent Document 1 corrects these installation errors by processing and adjusting the height of the legs of the vertical position adjustment fittings. Also, while centering of the pile and the pillar is necessary, the construction method of Patent Document 1 performs this centering work using a separate jig. However, the construction method for piles and superstructures in Patent Document 1 requires a lot of time to adjust and process the legs of the vertical position adjustment fittings and to perform centering work using other jigs, which could result in a longer construction period.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and aims to provide a method for joining a pile to a superstructure that can shorten the construction period by easily correcting vertical errors in the pile and centering the pile and the superstructure. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the method of joining a pile and a superstructure according to the present invention is a method of joining a pile set into the ground and a cap steel pipe that has a base plate, to the upper end of which the lower end of the superstructure is joined, attached to the upper end and placed around the pile head of the pile, and includes a jig fixing process for fixing a set-up jig to the pile head of the pile, a position adjustment process for adjusting the vertical and horizontal positions of the base plate supported by the set-up jig, a cap steel pipe fixing process for fixing the base plate, whose vertical and horizontal position adjustment has been completed, to the set-up jig, and a filling process for filling the inside of the cap steel pipe and the outer periphery of the pile with filler material through filling holes provided in the base plate. [Effects of the Invention]

[0007] According to the method of joining a pile to a superstructure of the present invention, the vertical and horizontal position of the base plate can be adjusted using a mounting jig fixed to the head of the pile, and the base plate can be fixed to the mounting jig.This makes it possible to shorten the construction period by easily correcting vertical errors in the pile and centering the pile and superstructure. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing a schematic view of a joint structure between a concrete pile and a column serving as an upper structure according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a view taken along the line AA in FIG. [Figure 3] FIG. 2 is a view taken along the line BB in FIG. [Figure 4] 1A to 1C are diagrams showing the construction procedure of the joint structure between a concrete pile and a pillar according to the first embodiment. [Figure 5] FIG. 10 is a diagram schematically illustrating a joint structure between a steel pipe pile and a column that is an upper structure according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., may differ from the actual ones. Therefore, specific thicknesses and dimensions should be determined with reference to the following description. Furthermore, it goes without saying that the drawings may include parts with different dimensional relationships and ratios. Furthermore, the embodiments shown below are merely examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical concept of the present invention can be modified in various ways within the technical scope defined by the claims.

[0010] [First embodiment] FIG. 1 is a schematic explanatory view of a joint structure between a concrete pile and a superstructure according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. Reference numeral 1 in Figure 1 is a concrete pile erected in the ground 2, formed from a cylindrical concrete pipe, with its top protruding from a root cut 3. A steel pile head ring 4 is integrated into the top of the concrete pile 1, and the hollow part of the concrete pile 1 is filled up to the top with internal pile residue 5, such as soil and sand, cement milk for fixing the pile.

[0011] 1 denotes a mounting jig, and includes a fixed plate 11, four long nuts 12a to 12d welded to the top surface of the fixed plate 11 and standing vertically, four anchor bolts 13 threaded into the long nuts 12, and a fixed nut 14A and a level-adjusting nut 14B threaded into each anchor bolt 13. The fixed nut 14A is a double nut consisting of two nuts 14a1 and 14a2, and the level-adjusting nut 14B is also a double nut consisting of two nuts 14b1 and 14b2. A concrete filling hole 11a is formed in the fixed plate 11.

[0012] As shown in Figure 2, a plurality of pile head holding members 6 and support plates 7 are welded to the upper surface of the pile head steel ring 4 at intervals in the circumferential direction. The pile head holding members 6 are members that are held by the pile driver when driving the concrete pile 1 into the ground 2 with the pile driver. The fixing plate 11 is joined to the upper surfaces of the plurality of support plates 7 by welding, and is fixed horizontally to the top of the concrete pile 1. 2, the support plate 7 is located directly below the four long nuts 12 fixed to the upper surface of the fixing plate 11. Furthermore, as shown in FIG. 2, the fixing plate 11 is arranged so that the position where the diagonal line of one pair of long nuts 12a, 12c intersects with the diagonal line of another pair of long nuts 12b, 12d coincides with the axis P of the concrete pile 1.

[0013] Reference numeral 15 denotes a cap steel pipe that joins the concrete pile 1 and a pillar 18. This cap steel pipe 15 comprises a cylindrical main body 16 formed into a cylindrical shape with an inner diameter larger than the outer diameter of the concrete pile 1, a base plate 17 fixed to the upper end of the cylindrical main body 16, and a pillar 18 with an H-shaped cross section that serves as an upper structure and is fixed to the base plate 17 by welding. The base plate 17 is formed with a plurality of bolt passage holes 17a through which a plurality of anchor bolts 13 of the erection jig 10 pass, as well as with a concrete filling hole 17b.

[0014] The anchor bolt 13 of the installation jig 10 is inserted from below into the bolt passage hole 17a of the base plate 17, and the lower end of the tubular main body 16 is placed on the mortar 19 formed on the bottom surface of the excavation 3, and a cap steel pipe 15 is placed around the head of the concrete pile 1. Then, by appropriately adjusting the vertical position of each of the multiple level adjustment nuts 14B engaged with each anchor bolt 13, the vertical position of the base plate 17 is set and the concrete pile 1 and the column 18 are centered. In addition, by engaging the multiple fixing nuts 14A with the anchor bolts 13, the base plate 17 is sandwiched between the multiple level adjustment nuts 14B and the cap steel pipe 15 is fixed. The inside of the cap steel pipe 15 and the top of the inside of the concrete pile 1 are filled with concrete 20.

[0015] Next, an example of a construction procedure for joining the concrete pile 1 of the first embodiment configured as described above to the pillar 18 will be described with reference to FIGS. 4(a) to 4(d) and FIG. First, as shown in Figure 4(a), a concrete pile 1 is erected into the ground 2 with its upper portion protruding from the excavation 3. A steel pile head ring 4 with multiple pile head holding members 6 welded to it is integrated into the pile head of the concrete pile 1. Next, as shown in Figure 4(b), four support plates 7 are placed on the pile head of the concrete pile 1, and they are positioned so that their diagonals coincide with the axis P of the concrete pile 1 and joined by welding.

[0016] Next, as shown in Figure 4(c), the fixing plate 11 is placed so that the long nuts 12 are positioned directly above the four support plates 7, and the fixing plate 11 is joined by welding to the multiple support plates 7 and the pile head holding members 6. Here, if the concrete pile 1 is eccentric, the fixing plate 11 can be adjusted in position horizontally and joined to the support plates 7 by welding, thereby making it possible to correctly position the concrete pile 1 horizontally.

[0017] Next, as shown in FIG. 4(d), anchor bolts 13 are screwed into the four long nuts 12 of the fixing plate, and then level-adjusting nuts 14B are engaged with each anchor bolt 13. The vertical position of each level-adjusting nut 14B is adjusted so that the top of each level-adjusting nut 14B is vertically aligned with the bottom of the base plate 17 of the cap steel pipe 15. The double nuts (nuts 14b1 and 14b2) that make up the adjusted level-adjusting nut 14B are then fully tightened to prevent loosening of the double nuts. Next, anchor bolts 13 are inserted from below through the bolt-passing holes 17a of the base plate 17 of the cap steel pipe 15, and the bottom surface of the base plate 17 is placed on the level-adjusting nuts 14B whose vertical position has been adjusted. This positions the base plate 17 horizontally as designed, and completes the centering of the concrete pile 1 and the column 18.

[0018] 1, the multiple fixing nuts 14A are engaged with the anchor bolts 13, and the multiple level adjusting nuts 14B sandwich the base plate 17 to fix the cap steel pipe 15. Then, the double nuts (nuts 14b1 and 14b2) that make up the fixing nuts 14A are fully tightened to prevent the double nuts from loosening. Next, concrete 20 is filled into the cap steel pipe 15 through the concrete filling hole 17b in the base plate 17. The filled concrete 20 flows into the interior of the concrete pile 1 through the concrete filling hole 11a in the fixed plate 11, and also fills the top of the residue 5 inside the pile, completing the construction.

[0019] Next, the effects of the method for joining the concrete pile 1 and the pillar 18 according to this embodiment will be described. In this embodiment, the horizontal position adjustment of the base plate 17 of the cap steel pipe 15 and the centering of the concrete pile 1 and the column 18 can be completed in a short time simply by vertically moving the level adjustment nut 14B engaged with the anchor bolt 13 of the installation jig 10, thereby significantly shortening the construction period compared to conventional construction methods that require adjusting and processing the legs of the vertical position adjustment fittings and centering work using other jigs.

[0020] In addition, the concrete pile 1 and the base plate 17 of the cap steel pipe 15 are fixed via four anchor bolts 13 of the installation jig 10, but a support plate 7 is positioned directly below the four anchor bolts 13 via a fixing plate 11, so even if a pull-out force or horizontal force acts on the anchor bolt 13 due to the load acting on the column 18, the concrete pile 1 receives it via the support plate 7, so the column 18 can be stably fixed to the concrete pile 1.

[0021] Furthermore, if the concrete pile 1 set into the ground 2 is eccentric, the correct horizontal positioning of the concrete pile 1 can be achieved simply by adjusting the horizontal position of the fixing plate 11 when joining the fixing plate 11 to the support plate 7, and the eccentricity of the concrete pile 1 can be easily corrected. In addition, the anchor bolts 13 rising from the fixed plate 11 of the installation jig 10 are fixed by screwing them into long nuts 12 which are welded to the fixed plate 11, and compared to a structure in which the anchor bolts 13 are directly welded to the fixed plate 11, the fixing strength of the anchor bolts 13 can be increased by increasing the circumferential length of the long nuts 12 through welding.

[0022] Furthermore, by configuring the level adjustment nut 14B as a double nut (nuts 14b1 and 14b2), the level adjustment nut 14B can be easily fixed by simply tightening nuts 14b1 and 14b2 after completing the horizontal position adjustment of the base plate 17 of the cap steel pipe 15. Furthermore, by configuring the fixing nut 14A as a double nut (nuts 14a1 and 14a2), the base plate 17 of the cap steel pipe 15 can be easily clamped vertically between the level adjustment nut 14B and the nuts 14a1 and 14a2 by simply tightening them.

[0023] Furthermore, by providing the concrete filling holes 17a in the base plate 17 of the cap steel pipe 15, the work of filling the inside of the cap steel pipe 15 with concrete 20 can be easily carried out. Furthermore, by providing a concrete filling hole 11a in the fixed plate 11 of the installation jig 10, the concrete 20 filled inside the cap steel pipe 15 penetrates into the fixed plate 11 and is also filled above the pile internal residue 5 of the concrete pile 1, thereby preventing deformation of the fixed plate 11.

[0024] [Second embodiment] Next, Fig. 5 is a schematic explanatory diagram of a joint structure between a steel pipe pile and a superstructure according to a second embodiment of the present invention. The same components as those in the first embodiment shown in Figs. 1 to 4 are designated by the same reference numerals and will not be described again. Reference numeral 21 in Figure 5 denotes a steel pipe pile erected in the ground 2. It is formed from a cylindrical iron pipe, with its upper portion protruding from the excavation 3. A cover steel plate 22 is integrated with the head of the steel pipe pile 21, and the hollow portion of the steel pipe pile 21 is filled up to the top with pile internal residue 5, such as soil and sand, cement milk for fixing the pile. A concrete filling hole 22a is formed in the cover steel plate 22. Furthermore, the fixing plate 11 of the erection jig 10 of this embodiment is joined to the cover steel plate 22 of the steel pipe pile 21 by welding.

[0025] The construction for joining the steel pipe pile 21 and the column 18 in this embodiment is the same as the method for joining the concrete pile 1 and the column 18 in the first embodiment, except that the fixing plate 11 of the installation jig 10 is fixed to the cover steel plate 22 of the steel pipe pile 21, and the concrete 20 filled into the cap steel pipe 15 from the concrete filling hole 17b of the base plate 17 enters the inside of the steel pipe pile 21 from the concrete filling hole 11a of the fixing plate 11 and the concrete filling hole 22a of the cover steel plate 22. Therefore, in the method of joining the steel pipe pile 21 and the column 18 in this embodiment, the vertical position adjustment of the base plate 17 of the cap steel pipe 15 and the centering of the steel pipe pile 21 and the column 18 can be completed in a short time simply by moving the level adjustment nut 14B engaged with the anchor bolt 13 of the installation jig 10 vertically, thereby significantly shortening the construction period compared to conventional construction methods.

[0026] In addition, the base plate 17 of the steel pipe pile 21 and the cap steel pipe 15 has a cover steel plate 22 placed directly below the four anchor bolts 13 of the installation jig 10, so even if a pull-out force or horizontal force acts on the anchor bolt 13 due to the load acting on the column 18, the steel pipe pile 21 receives the force via the cover steel plate 22, allowing the column 18 to be stably fixed to the steel pipe pile 21. Furthermore, if the steel pipe pile 21 erected in the ground 2 is eccentric, the correct horizontal positioning of the steel pipe pile 21 can be achieved simply by adjusting the horizontal position of the fixing plate 11 when joining the fixing plate 11 to the cover steel plate 22, and the eccentricity of the steel pipe pile 21 can be easily corrected.

[0027] Furthermore, as in the first embodiment, by increasing the circumferential length of the long nut 12 fixed to the fixing plate 11 by welding, the fixing strength of the anchor bolt 13 of the installation jig 10 can be increased, and by configuring the level adjustment nut 14B as a double nut (nuts 14b1, 14b2), the fixing operation of the level adjustment nut 14B can be easily performed, and by configuring the fixing nut 14A as a double nut (nuts 14a1, 14a2), the base plate 17 of the cap steel pipe 15 can be easily clamped from the vertical direction. Furthermore, by providing a concrete filling hole 22a in the cover steel plate 22, the concrete 20 filled inside the cap steel pipe 15 penetrates into the inside of the fixing plate 11 and is also filled above the pile internal residue 5 of the steel pipe pile 21, thereby preventing deformation of the fixing plate 11. [Explanation of symbols]

[0028] 1. Concrete piles 2 Ground 3 Root cutting 4 Pile head steel plate ring 5. Residue inside the pile 6 Pile head holding member 7 Support Plate 10 Installation jig 11 Fixing plate 12 Long nut 13 Anchor bolt 14A Fixing nut 14B Level adjustment nut 14a1,14a2 nuts 14b1,14b2 Nut 11a Concrete filling hole 15 Cap steel pipe 16 Cylindrical main body 17 Base Plate 17a Bolt passage hole 17b Concrete filling hole (filling hole) 18 pillars 19 Throwaway Con 20 Concrete (filler) 21 Steel pipe pile 22 Lid steel plate 22a Concrete filling hole (filling hole)

Claims

1. A method for joining a pile that has been set into the ground with a plurality of pile head holding members fixed to the top surface of the pile head at circumferentially spaced intervals, and a cap steel pipe that has a base plate at its upper end to which the lower end of a superstructure is joined and is placed around the pile head of the pile, a jig fixing process for adjusting the horizontal position of a mounting jig and fixing it to the pile head of the pile; a position adjusting step of adjusting a vertical position of the base plate supported by the installation jig; a cap steel pipe fixing process of fixing the base plate, whose vertical and horizontal position adjustments have been completed, to the installation jig; and a filling step of filling a filler material into the inside of the cap steel pipe and the outer periphery of the pile through a filling hole provided in the base plate, The installation jig is A plurality of support plates fixed to the pile head between the plurality of pile head holding members; a fixing plate having a lower surface fixed to the plurality of support plates; a plurality of anchor bolts that are connected to the fixing plate and rise vertically from the upper surface of the fixing plate at at least three positions evenly spaced in the circumferential direction, and that are inserted from below into bolt insertion holes provided in the base plate; a level adjusting nut and a fixing nut engaged with the plurality of anchor bolts, In the jig fixing step, the fixing plate is adjusted in position horizontally relative to the eccentricity of the pile and fixed to the support plate and the pile head gripping member, In the position adjustment step, the level adjustment nut that contacts the lower surface of the base plate is moved in an up-down direction to adjust the vertical position of the base plate; A method for joining a pile to an upper structure, characterized in that in the cap steel pipe fixing process, the base plate is clamped between the fixing nut and the level adjustment nut abutting the upper surface of the base plate.

2. 2. The method for joining a pile to a superstructure according to claim 1, wherein a plurality of long nuts are fixed to the upper surface of the fixing plate, and the anchor bolts are screwed into these plurality of long nuts.

3. 3. The method for connecting a pile to a superstructure according to claim 1, wherein the level adjusting nut and the fixing nut are configured as a double nut.

4. The piles are made of concrete piles, A method for joining a pile to a superstructure as described in claim 1 or 2, characterized in that in the jig fixing process, the erection jig is fixed via a support plate fixed to a pile head steel plate ring provided at the pile head of the concrete pile.

5. The piles are made of steel pipe piles, 3. The method for joining a pile to a superstructure according to claim 1, wherein in the jig fixing step, the erection jig is fixed to a cover steel plate provided on the pile head of the steel pipe pile.

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