JPH11117294A - Connecting method of pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting method of a pile free to speedily construct and economical as well as excellent in workability at a working site and not requiring a special skill. SOLUTION: A section pile 1 as a lower pile is made to sink and provided to specified depth in a drilled hole 10 filled with a hardenable filler 11 of soil mortar, etc. A steel pipe 2 for connection is put on a section part 1b on the top part of the section pile 1 in a sate where an upper end part of the lower pile is in the neighbourhood of a hole opening of the drilled hole 10, a wedge 6 is driven between a barrel part 1a of the section pile 1 and an inner surface of the steel pipe 2, and the section pile 1 and the steel pipe 2 are fixed. Continuously, the lower end barrel part 1a of the section pile 1 as an upper pile is inserted to an upper part of the steel pipe 2. At this time, an adhesive 4 of resin, etc., is applied on a connecting end part of the upper and lower section piles 1, and the upper and lower section piles 1 are temporarily connected to each other in the inside of the steel pipe 2. They are further made to sink and provided to specified depth in a state where the upper and lower section piles 1 are connected to each other. As the hardenable filler 11 flown in a clearance of the steel pipe 2 and the section pile 1 is hardened, the upper and lower section piles 1 and the steel pipe 2 are integrated, and necessary rigidity is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for vertically joining existing piles constituting an embedded pile.
In the present invention, a knotted pile is used as the lower pile, and the upper pile may be a columnar concrete pile, a steel pipe / concrete composite pile (SC pile), a steel pipe pile, or the like, in addition to the same knotted pile as the lower pile.

[0002]

2. Description of the Related Art Conventionally, when adding knots in the vertical direction, as shown in FIG. 5, welding end plates are previously attached to the ends of the piles, and the end plates 3 of the knot piles 1 are joined together. It is common to join by field butt welding.

FIG. 5 shows a case where the knotted pile 1 is constructed as a buried pile, in which a drilling hole 10 is filled with a hardening filler 11 such as soil mortar or cement milk. 1 is deposited and the curable filler 11
The foundation pile with large bearing capacity is formed by hardening.

[0004]

However, the above-mentioned conventional joining method has the following problems.

For butt welding, high-precision construction is required on site.

[0006] In the case of small-diameter piles, welding requires special skill and is time-consuming.

[0007] Due to the reduction in the work efficiency due to welding, an increase in cost is inevitable.

[0008] The above-mentioned problem is the same when the above-mentioned other round pile or the like is added to the node pile.

The present invention has been made to solve the above-mentioned problems in the prior art, and is excellent in workability on site, can be rapidly constructed without special skills, and can be economically connected with piles. It is intended to provide a way.

[0010]

The invention according to claim 1 of the present application is a joint between a lower pile composed of a knotted pile constructed as an embedded pile in an excavation hole and an upper pile having at least a lower end having a circular cross section. In the method, a steel pipe for joining having an inner diameter larger than the outer diameter of the trunk of the knotted pile as the lower pile and smaller than the outer diameter of the knotted part is provided on the outer periphery of the joint end of the upper and lower piles, It is installed so as to cover the trunk and the lower end of the upper pile connected to it, a spacer is interposed between the inner surface of this steel pipe and the joint end of the upper and lower piles, and the hardening filler filled in the drill hole is filled. It is characterized in that it penetrates between the joint ends of the upper and lower piles held by the spacers and the steel pipe, and joins the upper and lower piles by hardening of the hardening filler inside and outside the steel pipe.

In addition, when installing the steel pipe for joining, by temporarily attaching the joining ends of the upper and lower piles with an adhesive (corresponding to claim 2), the joining operation using the steel pipe and the spacer can be performed. It can be done smoothly. Further, the adhesive strength of the adhesive can be added as the bonding strength. In addition,
The method of the temporary attachment is not limited to the adhesive, and various methods such as winding an adhesive tape can be considered.

As described above, the joining steel pipe is installed between the uppermost node of the lower pile and the lowermost part of the upper pile under the relationship of approximately the node outer diameter> the steel pipe diameter> the trunk outer diameter. By introducing a hardening filler that solidifies the pile circumference to the inside of the steel pipe at the joint,
The upper and lower piles are integrated.

The embedding pile is basically provided by embedding a ready-made pile in a ground excavated to a depth substantially equal to the entire length thereof, and a hardening filler (such as soil mortar or the like) mixed with excavated soil at the time of excavation. ), Or in a single hardening filler such as cement milk, the lower pile is sunk, and the upper stake is connected and further sunk. In some cases, it is conceivable that the lower pile and the upper pile are connected in advance and then laid.

Claims 3 to 5 each limit one aspect of the form of the spacer.

A third aspect of the present invention is a wedge-shaped jig in which a plurality of spacers are provided between the joint end of the knotted pile and the inner surface of the steel pipe. The upper and lower stakes can be connected while keeping them almost constant.

Claim 4 limits the case where the spacer is a plurality of protrusions projecting from the outer surface of the trunk at the joint end of the knotted pile or the inner surface of the steel pipe for joining.

A fifth aspect is a case where the spacer is a plurality of screw-shaped guide pins provided through the pipe wall of the steel pipe for joining, and the amount of penetration into the inside of the steel pipe can be adjusted in a threaded manner. ing.

The mode of the spacer is not limited to these. For example, a spacer using a shape memory alloy in a wedge shape and utilizing the shape memory characteristic can be considered.

The invention according to claim 6 of the present application is a method for joining a lower pile composed of a knotted pile constructed as an embedded pile in an excavation hole and an upper pile having at least a lower end having a circular cross section, A steel pipe with an inside diameter slightly larger than the outside diameter of the body of the knotted pile as the lower pile is installed on the outer periphery of the joint end of the pile to cover the upper body of the knotted pile and the lower end of the upper pile, and excavated. A joint between a knotted pile and a round pile, wherein the upper and lower piles are joined by hardening of a curable filler filled in the hole.

That is, the inner diameter of the joining steel pipe is set to be slightly larger than the outer diameter of the trunk of the knotted pile as the lower pile without using the spacer in the above-mentioned claim 1, so that the engagement state is achieved. The upper and lower piles and the steel pipe are integrated by hardening the hardening filler material around the joint.

In the joining method according to each of the above claims, the upper pile may be a node pile having the same diameter as the node pile as the lower pile (corresponding to claim 7), or a columnar concrete pile, steel pipe concrete Even round piles such as composite piles, steel pipe piles, etc.
It suffices that at least the cross-sectional shape of the lower end is circular.

[0022]

FIG. 1 shows an embodiment of the present invention, in which a wedge 6 is used as a spacer.

As a typical construction procedure, first, a hardening filler 11 such as soil mortar or cement milk is used.
A knotted pile 1 as a lower pile is sunk to a predetermined depth in an excavation hole 10 filled with.

In a state where the upper end of the lower pile is near the opening of the excavation hole 10, the joining steel pipe 2 is put on the uppermost joint 1 b of the joint pile 1, and the trunk 1 a of the upper end of the joint pile 1 is provided. By inserting a wedge 6 (4 to 6 places) between the steel pipe 2 and the inner surface of the steel pipe 2, the knotted pile 1 and the steel pipe 2 are fixed.

As the steel pipe 2, the inside diameter of the trunk 1 a of the nodal pile 1 is used.
Use a steel pipe with a length of several tens of cm to about 1 m, which is larger than the outer diameter of

Subsequently, as the upper pile, the lower body 1a of the knot 1 which is the same as the lower pile in this example is inserted into the upper part of the steel pipe 2. At this time, one or both of the joint ends of the upper and lower knots 1 are coated with an adhesive 4 such as a resin, and the upper and lower knots 1 are joined.
The workability can be improved by temporarily attaching the members in the steel pipe 2.

In this way, with the upper and lower knots 1 connected to each other, the knots 1 are further sunk to a predetermined depth. At this time, the hardening filler 11 flows into the gap between the steel pipe 2 and the knots 1, By solidification of the hardening filler 11, the upper and lower knots 1 and the steel pipe 2 are integrated, and required rigidity is secured.

The procedure of laying and joining is as follows. A steel pipe 2 for joining is put on an upper part of a knot pile 1 as a lower pile which has been sunk halfway as described above, and a knot pile 1 as an upper pile is connected. In general, the procedure of submerging to a predetermined depth is also common. However, it is also possible to connect the upper and lower knots 1 using the steel pipe 2 or the adhesive 4 if necessary, and then to submerge.

FIG. 2 shows another embodiment of the present invention, in which a guide pin 5 is used as a spacer. Also in this example, the same pile 1 as the lower pile is used as the upper pile.
Is used.

The guide pins 5 are provided in advance at lower and upper portions of the steel pipe 2 at two to four places, respectively, penetrating the pipe wall. , The amount of penetration can be adjusted.

When connecting the lower pile 1 and the upper pile 1 to each other, with the guide pin 5 loosened (the amount of penetration is reduced), the uppermost node of the lower pile 1 is connected. The lower end of the steel pipe 2 is put on 1b, and the pin 1 and the steel pipe 2 are fixed by screwing the guide pins 5. At that time, by adjusting the amount of penetration of each guide pin 5, the steel pipe 2 can be positioned.

Subsequently, the lower end body 1a of the upper knot 1 is inserted into the inside of the steel pipe 2, and the guide pin 5 is screwed in the same manner to fix the upper knot 1 and the steel pipe 2. At this time, by applying the resin-based adhesive 4 to the joining end of the knot pile 1, the joining work can be performed more smoothly with the upper and lower knot piles 1 temporarily attached.

While the upper and lower knots 1 are connected, the guide pins 5 are laid as buried piles in the excavation holes 10 filled with the hardening filler 11 such as soil mortar or cement milk. Knotted pile 1
The hardening filler 11 enters the space in the joint portion between the steel pipe 2 and the steel pipe 2, and after the sedimentation is completed, the hardening filler 11 hardens, whereby the joining of the upper and lower knots 1 is completed.

FIG. 3 shows still another embodiment of the present invention, in which a wedge 6 is used as a spacer similarly to the case of FIG. 1, and in this example, a knotted pile 1 is used as an upper pile. Instead, steel-pipe concrete composite pile (SC pile) 21
Is used.

The joining procedure and method are the same as in the case of FIG. 1. In addition, the case where an existing concrete pile, a steel pipe pile, or the like is used as the upper pile can be similarly considered.

Further, the guide pins 5, protrusions and the like shown in FIG. 2 can be applied as spacers.

FIG. 4 shows another embodiment of the present invention which does not require a spacer. In this embodiment, a knot pile 1 is used as an upper pile (however, another round pile or the like). Or, at least, a pile having a circular cross section at the lower end can be similarly considered).

That is, the example shown in FIG. 4 corresponds to claims 6 and 7, in which a steel pipe having an inner diameter slightly larger than the outer diameter of the trunk 1a of the knotted pile 1 is used as the steel pipe 2 for joining. .

The steel pipe 2 is placed on the uppermost node 1b of the node pile 1 as a lower pile sunk in the borehole 10.
The knotted pile 1 as an upper pile is inserted into the upper part of the steel pipe 2, and is further sunk to a predetermined depth.

Thereafter, the hardening filler 11 in the borehole 10 is
By solidification, the upper and lower knots 1 and the steel pipe 2 are integrated, and required rigidity is secured.

In the case of the knotted piles 1 at both the upper and lower sides as in this example, there is no possibility that the joining steel pipe 2 is largely displaced due to the presence of the knotted portions 1b. It is also possible.

When the upper pile is not a node pile, for example, a steel pipe pile or an SC pile, the displacement can be suppressed to some extent by making the inner diameter of the joining steel pipe 2 as close as possible to the outer diameter of the upper pile. However, it is also possible to positively suppress the displacement by attaching a simple stopper or injecting an adhesive.

[0043]

[Effects of the Invention] Since the upper and lower knots can be connected to each other by an adhesive, a steel pipe for connection, a spacer, or the like without using a welder or by using a spacer, construction on site is easy.

Since no special skills are required for the joining and the joining can be performed in a short time, the construction cost can be greatly reduced.

By using a screw-shaped guide pin, a wedge-shaped jig, a shape memory alloy, or the like as the spacer, the effect of restraining or positioning the joint by the spacer itself can be obtained.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a vertical sectional view and (b) is a horizontal sectional view.

FIG. 2 shows another embodiment of the present invention, in which (a)
Is a vertical sectional view, and (b) is a horizontal sectional view.

FIGS. 3A and 3B show still another embodiment of the present invention, wherein FIG. 3A is a vertical sectional view and FIG. 3B is a horizontal sectional view.

FIGS. 4A and 4B show still another embodiment of the present invention, wherein FIG. 4A is a vertical sectional view and FIG. 4B is a horizontal sectional view.

FIG. 5 is a cross-sectional view showing a conventional method of joining knotted piles by butt welding on site.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Knotted pile, 1a ... Body, 1b ... Knot, 2 ... Steel pipe, 3 ... End plate, 4 ... Adhesive, 5 ... Guide pin, 6 ... Wedge, 10 ...
Drilling hole, 11: hardening filler, 21: steel pipe concrete composite pile

Claims (8)

[Claims] 1. A method of joining a lower pile consisting of a knotted pile constructed as a buried pile in an excavation hole and an upper pile having at least a lower end having a circular cross-sectional shape, wherein the upper pile has upper and lower piles having a circular outer periphery. A steel pipe having an inner diameter greater than the outer diameter of the trunk of the knotted pile as the lower pile and having an inner diameter smaller than the outer diameter of the knotted part is installed so as to cover the upper end trunk of the lower pile and the lower end of the upper pile, A spacer is interposed between the inner surface and the joint end of the upper and lower piles, and the hardening filler filled in the drill hole penetrates between the joint end of the upper and lower piles held by the spacer and the steel pipe. And joining the upper and lower piles by hardening the hardening filler inside and outside the steel pipe. 2. The method for joining piles according to claim 1, wherein when installing the steel pipe, joining ends of upper and lower piles are temporarily attached with an adhesive. 3. The method for joining piles according to claim 1, wherein the spacer is a plurality of wedge-shaped jigs provided between a joint end of the upper and lower piles and a steel pipe. 4. The pile according to claim 1, wherein the spacer is a plurality of protrusions protruding from the outer surface of the trunk portion at the joint end of the knot pile as the lower pile, the outer surface of the joint end of the upper pile, or the inner surface of the steel pipe. Joining method. 5. The spacer according to claim 1, wherein the spacer is a plurality of screw-shaped guide pins provided through the pipe wall of the steel pipe.
Or the method of joining piles according to 2. 6. A method for joining a lower pile composed of a knotted pile constructed as a buried pile in an excavation hole and an upper pile having at least a lower end having a circular cross-sectional shape, wherein the upper pile is connected to an outer periphery of a joint end of the upper and lower piles. A steel pipe having an inner diameter slightly larger than the outer diameter of the body of the knotted pile as the lower pile is installed so as to cover the upper torso of the knotted pile and the lower end of the upper pile, and the hardening filled in the excavation hole is provided. A method of joining piles, wherein upper and lower piles are joined by hardening of a conductive filler. 7. The method of joining piles according to claim 1, wherein the upper pile is a node pile having the same diameter as a node pile as a lower pile. 8. The method according to claim 8, wherein the upper pile is a cylindrical concrete pile,
The pile joining method according to any one of claims 1 to 6, which is a steel pipe concrete pile or a steel pipe pile.