JP2007126877A - Pile and column connection structure and pile and column connection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective means for rationally connecting between a pile and column via a connection steel pipe. <P>SOLUTION: The pile 1 and the column 6 are connected together via a pile head connection member 10 and concrete 15 filled in the same. The pile head connection member is obtained by welding an annular ring member 12 to the inside of a lower end of the connection steel pipe 11 having a diameter larger than a pile diameter ϕ, and arranging shift prevention members 13 at least on the inside of an upper end of the connection steel pipe. Specifically a pile head is loosely inserted inside the ring member, and the lower end of the connection steel pipe is mounted on the pile head in a manner wrapping the same. Then a column pedestal portion is inserted inside an upper portion of the pile head connection member to arrange the column pedestal and the pile head so as to be opposed to each other while securing a space therebetween, and further the concrete 15 is poured inside the pile head connection member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a simple and rational structure for joining a pile and a column during construction of a building, and a construction method thereof.

  For example, in the case of a relatively small steel structure that has only a ground floor and no basement and no foundation beam, the steel column is being used for the purpose of simplifying the connection between the steel column and the foundation. It is directly embedded in (embedded column base), the column base is covered with reinforced concrete up to a predetermined height (root-wrapped column base), and a ready-made base member made of casting or the like is integrated into the column base and anchored to the foundation The structure of fixing with respect to it is used.

  However, in the embedded column base, the interference between the column base portion and the foundation reinforcing bar is inevitable and the construction is troublesome, and the root winding column base has a problem that the column cross section of the column base portion becomes large. In addition, the ready-made base members are not only expensive, but also require a large-diameter anchor bolt, so that the workability is not always good, and many of them are not always satisfactory in terms of strength.

As another joining structure, a method of joining a pile and a column using a steel pipe having a diameter larger than those has been proposed. For example, in Patent Document 1, a steel pipe pile and a steel pipe are mounted by attaching a steel pipe with an inner surface protrusion larger than the outer diameter of the steel pipe pile to the pile head, and inserting the lower end portion of the steel pipe column into the inside to fill the concrete. A structure of joining columns is disclosed, and Patent Document 2 discloses a foundation construction method with a similar structure.
JP 2000-355938 A JP 2001-288755 A

  According to the structure and construction method shown in Patent Document 1 and Patent Document 2, basically, it is possible to realize sufficient simplification as compared with the conventional general joining method, and sufficient structural stability and reliability are ensured. Although it is possible, in all cases, the length of the steel pipe attached to the pile head was large, and it was necessary to dig deeply around the pile in order to cover the steel pipe. Therefore, in order to further promote the spread of this type of joint structure as a truly effective structure, further improvement in workability, further reduction in construction costs, and improvement to enable more effective stress transmission are also necessary. It is.

  In view of the above circumstances, the joint structure of the present invention is a structure in which a pile and a column are joined via a pile head joint member and concrete filled therein, and the pile head joint member has a diameter larger than the pile diameter. An annular ring member is welded to the inside of the lower end of the joining steel pipe, and a slip stopper is provided at least inside the upper end of the joining steel pipe, and the pile head is loosely inserted inside the ring member of the pile head joining member. The pile head joint member is attached to the pile head in a state where the lower end portion of the bonded steel pipe wraps to the pile head, and the column base is inserted into the upper inside of the pile head joint member so that the column base and the pile head Are arranged facing each other in a separated state inside the pile head joining member, and concrete is cast and filled inside the pile head joining member.

  In the bonded structure of the present invention, the diameter of the bonded steel pipe in the pile head bonded member is approximately 1.5 times the pile diameter, and the lap dimension between the lower end of the bonded steel pipe and the pile head is 1/2 or more of the pile diameter. The distance between the column base and the pile head on the inside of the pile head joint member is set to 1/3 or more of the pile diameter, and the concrete is placed integrally on the inside and the top of the pile head joint member. It is most preferable that the embedded size of the column base is 1.5 times or more than the column formation.

  Moreover, in the joining structure of this invention, it is preferable to weld an anchor reinforcement to a pile head end plate, and when providing a foundation beam, in order to join the steel frame as a foundation beam outside the joining steel pipe in a pile head joining member When the column is a steel pipe column, it is preferable to provide a base plate on the column base and to form a central hole in the base plate.

  In the joining method of the present invention, when joining a steel pipe column and a pile with the above structure, a pile head joining member in which a ring member is welded to the inside of the lower end of the joined steel pipe and a slip stopper is provided on the inside of the upper end is prepared in advance. After the construction of the pile, the pile head is exposed, the pile head joint member is attached to the exposed portion and positioned, and the lower end portion of the steel pipe column to which the temporary bracket is attached in advance is inserted inside the pile head joint member, The steel pipe column is temporarily supported by the pile head joint member via the temporary bracket and positioned, and then the concrete is cast and filled inside the pile head joint member, and the center provided on the base plate of the steel pipe column The concrete is also filled in the lower end portion of the steel pipe column through the hole.

  According to the joining structure of the present invention, the pile head joining member and the concrete cast and filled therein can substantially function as a footing and can securely and firmly join the pile and the column. Of course, the pile head joint member is composed of a joint steel pipe and a ring member, and the joint steel pipe is provided with a stopper, so that it is more reliable and effective between the pile and the joint steel pipe than in the case of a conventional simple joint steel pipe. Stress transmission is possible, and the lap length between the bonded steel pipe and the pile head can be greatly reduced compared to the conventional case.

  In particular, the diameter of the bonded steel pipe is approximately 1.5 times the pile diameter, the lap dimension between the bonded steel pipe and the pile head is ½ or more of the pile diameter, and the separation dimension between the column base and the pile head is the pile diameter. It is the most rational and effective in terms of structure and construction that the embedment dimension of the column base in the concrete inside the pile head joint member should be 1.5 times or more than the column formation. It is.

  Moreover, a pile can be reliably fixed with respect to a pile head joining member by welding an anchor reinforcement to a pile head end plate. Further, by welding a bracket for joining the foundation beam to the outside of the joining steel pipe, it is possible to cope with the provision of a foundation beam having a steel frame without any trouble and excellent workability. Furthermore, by providing a base plate with a central hole in the column base as a steel pipe column, concrete filling is naturally performed in the column when filling the concrete into the pile head joint member, and air accumulation does not occur, Stress transmission between the concrete and the column is further ensured.

  According to the joining method of the present invention, the pile head joint member is simply mounted on the pile head, the column is temporarily supported by the temporary bracket with respect to the pile head joint member, and the pile head joint member is positioned. Since the concrete is cast and filled inside, the construction is not troublesome, no special materials, tools, construction machines are required, no on-site welding is required, and the rebar is complicated and complicated. Nonetheless, it is possible to realize a sufficient improvement in workability and labor saving compared with various conventional methods.

  The main object of the present invention is to cast and fill concrete inside a pile head joint member made mainly of a steel pipe, and to make it function substantially as a footing to join the pile and the column. Hereinafter, the piles and columns to be joined are SC piles and steel pipe columns, respectively, and FIGS. 1 to 3 are shown with respect to the embodiment in the case of joining a steel foundation beam made of H-shaped steel to a pile head joining member. The description will be given with reference.

  Reference numeral 1 denotes a pile to be joined. In this embodiment, an SC pile (centrifugal concrete pile with a shell steel pipe) having a known structure formed by centrifugally molding a concrete 3 in a shell steel pipe 2 as the pile 1 is used. A plurality of anchor bars 5 are planted on an annular pile head end plate 4 provided at the upper end thereof. Reference numeral 6 denotes a column to be joined. In this embodiment, a steel pipe column having a square cross section is used as the column 6, a base plate 7 is provided at the lower end (column base), and a center hole 8 is formed in the base plate 7. It is.

  Reference numeral 10 denotes a pile head joining member, and the pile head joining member 10 in the present embodiment is formed by welding a ring member 12 to the lower end inside of a joint steel pipe 11 having a predetermined length. The bonded steel pipe 11 has a diameter φ1 of about 1.5 times the pile diameter φ of the pile 1, and the ring member 12 has an annular shape having a center hole with an inner diameter slightly larger than the pile diameter φ. In addition, when the diameter φ1 of the bonded steel pipe 11 is sufficiently smaller than 1.5 times the pile diameter φ of the pile 1, it is not very effective, and conversely, it is useless to make it sufficiently large. It is preferably about 1.5 times (approximately 1.5 times).

  Further, a slip stopper 13 made of a steel material (for example, a flat bar having a cross-sectional dimension of 25 mm × 12 mm) is welded in an annular manner over two upper and lower stages inside the upper end portion of the above-described bonded steel pipe 11. This pile head joining member 10 is attached to the pile head in such a state that the pile head is loosely inserted inside the ring member 12 and the lower end portion of the joined steel pipe 11 is wrapped with a predetermined dimension on the pile head. A slight clearance 14 is secured between the center hole of the member 12 and the outer peripheral surface of the pile 1.

  And the lower end part (column base part) of the column 6 is inserted into the inside of the pile head joining member 10 mounted on the pile head in this manner, and the column base and the pile head are separated from each other with a slight gap. In addition, the concrete 15 is filled into the entire interior of the pile head joint member 10 and the inside of the column base of the column 6 so that the pile head joint member 10 and the concrete 15 inside thereof are substantially It functions as a footing, and the pile 1 and the column 6 are structurally joined together through it. Here, as shown to Fig.1 (a), the lap dimension of the pile head of the pile 1 and the lower end part of the pile head joining member 10 shall be 1/2 or more of pile diameter (phi), a column base, a pile head, The distance between the piles is 1/3 or more of the pile diameter φ, and the insertion length of the column base of the column 6 into the pile head joint member 10 is 1.5 times or more of the column formation B (dimension from the slab upper surface). ).

  Reference numeral 20 denotes a foundation beam. In this embodiment, the foundation beam 20 is a steel frame made of H-shaped steel, and the foundation beam 20 is joined to the outer peripheral surface of the joining steel pipe 11 of the pile head joining member 10. The bracket 21 is welded. That is, the outer diaphragm 22 welded to the outer peripheral surface of the joining steel pipe 11 at the position corresponding to the upper and lower flanges of the H-shaped steel as the foundation beam 20, and the web plate welded vertically between the outer diaphragms 22 23 is provided, and the base beam 20 is bolted to the bracket 21 via a splice plate 24. In addition, as shown in FIG.1 (b), the foundation beam 20 in this embodiment is arrange | positioned in the groove | channel 25 formed in the ground surface part, and the groove | channel 25 is used as a formwork (soil form), and it is cast and filled in the inside. However, it is also possible to simply backfill the periphery of the foundation beam 20 that has been subjected to anticorrosion coating while omitting such unreinforced concrete coating.

  The construction procedure of the above structure is shown in FIG. After construction of the pile 1 by a normal construction method, as shown in (a), the surrounding ground is excavated to the extent that the pile head is at least attached to the pile head joint member 10 (that is, the ring member of the pile head joint member 10). 12) (to the lower surface level of 12), and at the same time, the groove 25 for placing the foundation beam 20 is formed. Moreover, the pile 1 is welded with anchor bars 5 on the pile head end plate 4, and a pile head bottom plate 27 serving as a concrete stopper is provided in the hollow portion of the pile 1.

  As shown to (b), the pile head joining member 10 of the said structure produced previously is mounted | worn and positioned to a pile head. At that time, the pile head joining member 10 is gradually suspended from the position directly above the pile 1, and the circular flat bar integrated in advance on the outer periphery of the pile with the pile head inserted inside the ring member 12. It does not need to be welded to the pile 1 or fixed to the pile 1 in particular.

  As shown in (c), a base plate 7 having a center hole 8 is welded to the column 6, and temporary brackets 30 are radially attached in advance to the outer peripheral surface of the column base, and the column 6 is attached to the pile. The column base is inserted into the inside of the pile head joint member 10 from the position directly above 1 and temporarily supported by the pile head joint member 10 via the temporary bracket 30 so that the column base faces the pile head. The column 6 is positioned in a state of being opposed to each other. In addition, the base beam 20 is disposed in the groove 25 and bolted to the bracket 21 at the same time, so that the pile head joint member 10 is joined.

  After that, slab reinforcement is performed and concrete 15 is placed inside the pile head joining member 10. As a result, the concrete 15 is cast and filled in the inside of the pile head up to the position of the pile head bottom plate 27 and the whole inside of the pile head joint member 10, and in that case, the inside of the column 6 passes through the center hole 8 of the base plate 7. Naturally, the concrete 15 is integrally filled up to a certain level, and at the same time, air can be vented from the lower side of the base plate 7 through the center hole 8 without any trouble, so that no air pool is generated. Continuously after placing the concrete 15 on the pile head joint member 10, slab concrete is cast as it is to form a slab 31 (see FIG. 1), and also in the groove 25 in which the foundation beam 20 is disposed. To cover the foundation beam. If necessary, the strength of the concrete 15 filled in the pile head joint member 10 and the concrete 15 for forming the slab 31 and the concrete 26 placed around the foundation beam 20 may be changed. It is also preferable to use higher-strength concrete as the concrete 15 to be filled in the head joint member 10. In this case, the concrete may be divided and transferred in stages. Moreover, the temporary bracket 30 attached to the pillar 6 may be buried in the slab 31 as it is.

  According to the joining structure and joining method of the present embodiment described above, the pile head joining member 10 and the concrete 15 cast and filled therein substantially function as a footing, and the pile 1 and the column 6 are The structure can be securely and firmly joined. In particular, the pile head joint member 10 is provided with a detent 13, the pile head is provided with an anchor bar 5, and the column 6 is provided with a base plate 7. All the fixing strengths of the pillars 6 are sufficiently secured, and the tensile force can be transmitted effectively, so that structural integrity can be sufficiently secured.

  And according to the joining structure of this embodiment, the pile head joining member 10 of the form which provided the ring member 12 in the lower end of the joining steel pipe 11 was used, and the said pile head joining member 10 is the said with respect to the pile 1 and the column 6. As a result, the stress transmission between the pile 1 and the column 6 can be performed more reliably and effectively than in the case of such a conventional joining structure without the ring member 12. Therefore, it is possible to shorten the height of the bonded steel pipe 11 as compared with the conventional case, and accordingly, not only the member cost is reduced, but also the workability is improved by reducing the ground excavation depth, and the construction cost is reduced. Can also be planned.

  Moreover, since the joining method of this embodiment attaches the pile head joining member 10 so that it may just cover a pile head, and casts and fills the concrete 15 in the inside, the construction is not troublesome at all. No special materials, tools or construction machines are required, especially when the pile head joint member 10 is installed, no on-site welding is required, and many rebars are complicated as in the case of conventional general footing. Therefore, sufficient workability improvement and labor saving can be realized compared to various conventional methods.

  Furthermore, for the construction error of the pile 1, the fine adjustment of the positioning of the pile head joining member 10 within the clearance 14 secured between the ring member 12 and the pile 1 and the pile head joining member 10 It is possible to easily cope with the fine adjustment of the positioning of the pillar 6, thereby ensuring sufficient construction accuracy.

  Although one embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment. Needless to say, appropriate design changes can be made without departing from the scope of the present invention. Hereinafter, supplementary explanations, modifications, and application examples will be listed.

  Although the said embodiment is an application example in the case of joining an SC pile and a steel pipe column, the joining structure of this invention can also make the column 6 not only a square steel pipe column but a round steel pipe column or a steel column of arbitrary cross sections. Of course, the present invention can be similarly applied to a structure for joining the pile 1 and the pillar 6 having another structure. For example, FIG. 4A shows the pile 1 as a steel pipe pile. In this case, the lower half of the anchor bar 5 may be inserted into a pile head provided with a detent 13 and fixed. FIG. 4B shows the column 6 as an RC column. In this case, the column bar 32 may be inserted into the pile head joint member 10. Of course, it is possible to arbitrarily combine the pile 1 and the column 6 of another structure as long as the steel pipe pile and the RC column can be joined together as long as they can be joined via the pile head joining member 10.

  Although the said embodiment is an application example in the case of providing the foundation beam 20, when the foundation beam 20 is unnecessary, it may be omitted. In that case, the bracket provided on the pile head joint member 10 in the above embodiment. 21 may be omitted.

  The stopper 13 provided on the inner side of the upper end portion of the bonded steel pipe 11 in the pile head joint member 10 may be provided so as to obtain a desired stopper effect on the concrete 15 filled therein. The specific configuration is arbitrary, and the flat bar may be welded in a series of spirals instead of being welded in a two-stage annular shape as in the above embodiment, or an appropriate member such as a stud may be used. The welding may be performed by projecting to the inner surface side, and a weld bead that functions as the stopper 13 may be provided, or a steel pipe with an inner surface rib formed with an inner surface rib may be used as the bonded steel tube 11.

  The ring member 12 to be welded to the inner side of the lower end of the pile head joint member 10 may be formed in an annular shape from the beginning, but a member manufactured in a sector shape in which the ring is divided into two to four parts. Of course, it is possible to weld them together to form an annular shape, which is easier to manufacture and uses less material.

  Various pile studs may be used as the anchor bars 5 provided on the pile head end plate 4, and in particular, those having a fixing head whose diameter is enlarged at the tip as shown in the above embodiment can be suitably employed. However, it is not particularly limited, and the anchor bar 5 may be omitted without necessarily being provided when the fixing strength of the pile head with respect to the concrete 15 can be secured without a reinforcing bar.

It is a sectional side view which shows embodiment of the joining structure of this invention. FIG. It is a figure which shows a construction procedure same as the above. It is a figure which shows other embodiment same as the above.

Explanation of symbols

1 Pile (SC pile)
2 Shell steel pipe 3 Concrete 4 Pile head end plate 5 Anchor reinforcement 6 Column (steel pipe column)
7 Base plate 8 Center hole 10 Pile head joint member 11 Joint steel pipe 12 Ring member 13 Detachment 14 Clearance 15 Concrete 20 Foundation beam 21 Bracket 22 Outer diaphragm 23 Web plate 24 Splice plate 25 Groove (soil form)
26 Concrete 27 Pile head bottom plate 30 Temporary bracket 31 Slab 32 Column reinforcement φ Pile diameter φ1 Joint steel pipe diameter B Column formation

Claims (6)

A structure in which a pile and a column are joined via a pile head joint member and concrete filled therein,
The pile head joining member is formed by welding an annular ring member inside the lower end of the joining steel pipe having a diameter larger than the pile diameter, and being provided with a stopper at least inside the upper end of the joining steel pipe,
The pile head is loosely inserted inside the ring member of the pile head joint member, and the pile head joint member is attached to the pile head in a state where the lower end portion of the bonded steel pipe wraps to the pile head,
The column base is inserted into the upper inner side of the pile head joint member, and the column base and the pile head are arranged to face each other in a separated state inside the pile head joint member,
A pile-column joint structure, wherein concrete is cast and filled inside the pile head joint member. It is a joining structure of a pile and a pillar according to claim 1,
The diameter of the bonded steel pipe in the pile head joint member is approximately 1.5 times the pile diameter, and the lap dimension between the lower end portion of the joint steel pipe and the pile head is at least ½ of the pile diameter, The distance between the column base and the pile head on the inner side of the pile is 1/3 or more of the pile diameter, and the column base is embedded in the concrete that is integrally cast inside and above the pile head joint member A pile-column connection structure characterized in that the dimensions are 1.5 times or more of the column structure. It is the junction structure of a pile and a pillar in any one of Claims 1-2,
Pile-column connection structure characterized in that anchor bars are welded to the pile head end plate. It is the junction structure of a pile and a pillar in any one of claims 1-3,
A pile-column connection structure characterized in that a bracket for joining a steel frame as a foundation beam is welded to the outside of the steel pipe in the pile head joint member. It is the junction structure of a pile and a pillar in any one of Claims 1-4,
A pile-column connection structure characterized in that the column is a steel pipe column, a base plate is provided on the column base, and a center hole is formed in the base plate. It is a construction method for joining a pile and a pillar by the joining structure according to claim 5,
A pile head joint member with a ring member welded to the inside of the lower end of the joined steel pipe and provided with a slip stopper on the inside of the upper end is prepared in advance.
Expose the pile head after construction of the pile, attach the pile head joint member to the exposed part and position it,
Insert the lower end of the steel pipe column with the temporary bracket attached in advance into the inside of the pile head joint member, temporarily support the steel pipe column with the pile head joint member through the temporary bracket and perform positioning thereof,
After that, the pile and the column are characterized in that the concrete is cast and filled inside the pile head joint member, and the concrete is also filled inside the lower end portion of the steel tube column through the center hole provided in the base plate of the steel tube column. Joining method.

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