JP6796922B2 - Expansion type steel pipe pile press-fitting structure, pile-shaped reinforcement making method, and press-fitting jig used for it - Google Patents

Description

The present invention relates to an extended steel pipe pile press-fitting structure for press-fitting an extended steel pipe pile into the ground, a method for producing a pile-shaped reinforcing body, and a press-fitting jig used therefor.

Examples of this type of extended steel pipe pile press-fitting structure that have been conventionally used include the configurations shown in Patent Document 1 and the like below. That is, in the conventional structure, in order to secure a space for attaching the high-pressure fluid injection jig of the high-pressure water injection device to the pile head of the extended steel pipe pile, the expanded steel pipe pile is press-fitted into the ground to the extent that the pile head remains on the ground. ..

Japanese Unexamined Patent Publication No. 2014-95252

For example, the foundation of a building such as a house is often formed at a position where the bottom is lower than the ground surface. Therefore, when the conventional structure as described above is adopted, it is necessary to perform the method for creating the pile-shaped reinforcing body as shown in FIG. FIG. 4 is an explanatory view showing a conventional method for creating a pile-shaped reinforcing body. As shown in FIG. 4, in the conventional method, after the expansion type steel pipe pile 2 is expanded, the soil around the expansion type steel pipe pile 2 is excavated in order to adjust the pile head level to the design value (step S40), and the expansion type steel pipe is used. The pile 2 is cut at a predetermined depth and removed (step S41). After that, the root is cut and the foundation 6 is formed on the upper part of the extended steel pipe pile (step S42).

In such a conventional method, since the soil around the extended steel pipe pile is excavated in order to match the pile head level with the design value, it is necessary to treat the excavated soil, which increases the burden on the operator. If the excavated soil is simply left around the excavation hole, the excavated soil may collapse into the excavation hole and it may be necessary to perform the excavation again. In addition, cutting of extended steel pipe piles is not easy, and the burden on workers is increasing. The burden on these workers increases as the pile head level decreases and the number of piles increases.

In order to eliminate the need for cutting and removing the expansion type steel pipe pile, a method of press-fitting the expansion type steel pipe pile until the pile head is located in the ground is conceivable, but when this method is simply applied, high-pressure fluid injection cure It becomes difficult to secure a space for attaching the tool to the pile head. It is conceivable to excavate the soil around the extended steel pipe pile in order to secure a space for attaching the high-pressure fluid injection jig to the pile head, but the excavated soil still needs to be treated, which increases the burden on the operator.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to secure a space for attaching a high-pressure fluid injection jig to the pile head of an extended steel pipe pile and to burden the operator. It is an object of the present invention to provide a reductionable expansion type steel pipe pile press-fitting structure, a method for producing a pile-shaped reinforcing body, and a press-fitting jig used for the method.

The expansion type steel pipe pile press-fitting structure according to the present invention is attached to a recess formed in the ground, an expansion type steel pipe pile press-fitted into the ground so that the pile head is located in the recess, and a pile head in the recess. A high-pressure fluid injection jig is provided, and the recess is provided so as to have a gap between the inner peripheral wall of the recess and the pile head to secure a space for attaching the high-pressure fluid injection jig to the pile head. The inner peripheral wall of the recess is composed of compacted or compacted soil.

The method for creating a pile-shaped reinforcing body according to the present invention includes a step of press-fitting a tapered press-fitting jig into the ground and then removing the press-fitting jig from the ground to form a recess in the ground, and a pile head is located in the recess. Including a step of press-fitting an expansion type steel pipe pile into the ground and a step of attaching a high-pressure fluid injection jig to the pile head in the recess, the recess is formed in the pile head between the inner peripheral wall of the recess and the pile head. It is provided so as to have a gap for securing a space for attaching the high-pressure fluid injection jig, and the inner peripheral wall of the recess is composed of compacted or compacted soil.

The press-fitting jig according to the present invention is a press-fitting jig for press-fitting an expansion type steel pipe pile into the ground, and has a conical base portion having a small diameter surface and a tapered outer peripheral surface and a conical base portion. and a cylindrical portion of the cylindrical shape extending in the truncated cone part and coaxially from the large diameter surface of the small-diameter surface, the pile head of the extended steel pipe piles are provided can be inserted a through hole, the insertion hole Is extended to the inside of the cylindrical part, and the end surface of the insertion hole is provided inside the cylindrical part, and the pile head is inserted into the insertion hole and is press-fitted into the ground together with the expansion type steel pipe pile. It is configured to have an inner peripheral wall composed of compacted or compacted soil and to form a recess in the ground where the pile head is located inside.

According to the expansion type steel pipe pile press-fitting structure of the present invention, the recess is provided so as to have a gap between the inner peripheral wall of the recess and the pile head, and the inner peripheral wall of the recess is composed of compacted or compacted soil. Therefore, it is possible to reduce the burden on the operator while securing a space for attaching the high-pressure fluid injection jig to the pile head of the expansion type steel pipe pile.

It is explanatory drawing which shows the extended type steel pipe pile press-fitting structure by embodiment of this invention. It is a front view which shows the press-fitting jig for forming the recess of FIG. It is explanatory drawing which shows the pile-shaped reinforcement body production method by embodiment of this invention. It is explanatory drawing which shows the conventional pile-shaped reinforcement body production method.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1.
FIG. 1 is an explanatory view showing an extended steel pipe pile press-fitting structure according to an embodiment of the present invention. The extended steel pipe pile press-fitting structure of the present embodiment is a structure in the middle stage when creating a pile-shaped reinforcing body of a building such as a house, for example. In the figure, the expansion type steel pipe pile press-fitting structure includes a recess 1 and an expansion type steel pipe pile 2. The recess 1 is a recess or a hole formed in the ground 3. The expansion type steel pipe pile 2 is press-fitted into the ground 3 so that the pile head 2a is located in the recess 1. The press-fitting here means that a pressure consisting of at least one of a static load and a dynamic load is applied to the expansion type steel pipe pile 2 to push the expansion type steel pipe pile 2 into the ground 3. It is also possible to push the expansion type steel pipe pile 2 into the ground 3 only with a static load, and while applying the static load to the expansion type steel pipe pile 2, the dynamic load due to impact is added to the expansion type steel pipe pile 2 and the expansion type steel pipe pile 2 Can also be pushed into the ground 3.

As will be described later, the recess 1 is formed in the ground 3 by removing the press-fitting jig 4 (see FIG. 2) that has been press-fitted into the ground 3. That is, the recess 1 is formed by pushing the soil at the press-fit position of the press-fit jig 4 to the periphery when the press-fit jig 4 is press-fitted into the ground 3, and the inner peripheral wall 1a of the recess 1 is consolidated. Or it is composed of compacted soil. In other words, the recess 1 is not formed by excavation, and the formation of the recess 1 does not generate excavated soil. Therefore, the treatment of excavated soil, which has been conventionally required, becomes unnecessary, and the burden on the operator is reduced.

The recess 1 is provided so as to have a gap 1b between the inner peripheral wall 1a of the recess 1 and the pile head 2a. The gap 1b is for securing a space for attaching the high-pressure fluid injection jig 5 (see FIG. 3) to the pile head 2a of the expansion type steel pipe pile 2. Although it depends on the shape of the high-pressure fluid injection jig 5, it is preferable that the void 1b is secured all around the pile head 2a.

The expansion type steel pipe pile 2 has an expansion groove 2b. The expansion groove 2b is formed by deforming the peripheral wall of the expansion type steel pipe pile 2 so as to be recessed inward. An opening 2c is provided in the pile head 2a of the expansion type steel pipe pile 2. By injecting a pressure fluid into the expansion type steel pipe pile 2 through the opening 2c, the expansion groove 2b is expanded and the expansion type steel pipe pile 2 is expanded in the radial direction. As the pressure fluid, for example, high pressure water or the like can be used.

As will be described later, a foundation made of reinforced concrete or the like is formed on the pile head 2a of the expansion type steel pipe pile 2. Since the pile head 2a of the expansion type steel pipe pile 2 is arranged in the recess 1, that is, the pile head 2a of the expansion type steel pipe pile 2 is arranged at a position lower than the ground surface, the bottom of the foundation is located below the ground surface. Even when it is formed at a low position, it is not necessary to cut and remove the expansion type steel pipe pile 2, and the burden on the operator is reduced.

Next, FIG. 2 is a front view showing a press-fitting jig 4 for forming the recess 1 of FIG. In the figure, the press-fitting jig 4 is integrally provided with a truncated cone-shaped portion (conical shape with a missing top), a cylindrical truncated cone portion 41, and a rod-shaped shaft portion 42.

The small diameter surface 40a of the truncated cone portion 40 constitutes the tip of the press-fitting jig 4. That is, the press-fitting jig 4 is press-fitted into the ground 3 with the small diameter surface 40a of the truncated cone portion 40 as the tip. The outer peripheral surface of the truncated cone portion 40 constitutes a tapered outer peripheral surface 40b.

The small diameter surface 40a is provided with an insertion hole 43 extending coaxially with the truncated cone portion 40. The insertion hole 43 extends beyond the large diameter surface 40c of the truncated cone portion 40 to the inside of the cylindrical portion 41. The insertion hole 43 has a diameter larger than that of the pile head 2a of the expansion type steel pipe pile 2, and the pile head 2a of the expansion type steel pipe pile 2 can be inserted.

The cylindrical portion 41 extends from the large-diameter surface 40c of the truncated cone portion 40 toward the rear end side of the press-fitting jig 4, and is arranged coaxially with the truncated cone portion 40. The outer peripheral surface 41a of the cylindrical portion 41 extends parallel to the central axes of the truncated cone portion 40 and the cylindrical portion 41.

The shaft portion 42 extends from the rear end 41b of the cylindrical portion 41. A mounting hole 42a is provided at the rear end of the shaft portion 42. An extension rod or the like can be connected to the mounting hole 42a when the press-fitting jig 4 is press-fitted into the ground 3. The mounting hole 42a and the extension rod can be connected by, for example, screwing. A jig different from the press-fitting jig 4 such as the preceding excavation rod can be attached to the extension rod.

Next, FIG. 3 is an explanatory view showing a method for producing a pile-shaped reinforcing body according to the embodiment of the present invention. First, after inserting the pile head 2a of the expansion type steel pipe pile 2 into the insertion hole 43 of the press-fitting jig 4, the expansion type steel pipe pile 2 is press-fitted into the ground 3 (step S30), and the press-fitting jig 4 is inserted into the expansion type steel pipe. It is press-fitted into the ground 3 together with the pile 2 (step S31).

Next, the press-fitting jig 4 is removed from the ground 3 to form a recess 1 in the ground 3 (step S32). The press-fit structure at this stage corresponds to the structure shown in FIG. After the recess 1 is formed, the high-pressure fluid injection jig 5 is attached to the pile head 2a in the recess 1, and the pressure fluid is injected into the expansion type steel pipe pile 2 through the opening 2c of the pile head 2a. The expansion groove 2b is expanded to expand the expansion type steel pipe pile 2 in the radial direction (step S33).

Next, the high-pressure fluid injection jig 5 is removed from the pile head 2a (step S34), root cutting is performed, and the foundation 6 is formed on the pile head 2a (step S35).

In such an expansion type steel pipe pile press-fitting structure and a method for creating a pile-shaped reinforcing body, the recess 1 is provided so as to have a gap 1b between the inner peripheral wall 1a of the recess 1 and the pile head 2a, and is inside the recess 1. Since the peripheral wall 1a is made of compacted or compacted soil, it is possible to reduce the burden on the operator while securing a space for attaching the high-pressure fluid injection jig 5 to the pile head 2a of the expansion type steel pipe pile 2. That is, since the excavated soil is not generated due to the formation of the recess 1, the excavated soil treatment that has been conventionally required can be eliminated, and the burden on the operator can be reduced. In addition, it is possible to prevent the excavated soil from collapsing into the recess 1, and the burden on the operator can be reduced. Further, it is possible to eliminate the need for cutting and removing the expansion type steel pipe pile 2, and the burden on the operator can be reduced.

Further, an insertion hole 43 through which the pile head 2a can be inserted is provided at the tip of the press-fitting jig 4, and the press-fitting jig 4 is provided together with the expansion type steel pipe pile 2 with the pile head 2a inserted through the insertion hole 43. Is press-fitted into the ground, so that the press-fitting step of the expansion type steel pipe pile 2 and the forming step of the recess 1 can be performed at the same time, and the work efficiency can be improved.

Further, since the press-fitting jig 4 is provided with a truncated cone-shaped truncated cone portion 40 having a small diameter surface 40a forming the tip of the press-fitting jig 4 and a tapered outer peripheral surface 40b, the press-fitting jig 4 is provided. The inner peripheral wall 1a of the recess 1 can be more reliably composed of compacted or compacted soil while reducing the force required for press fitting of 4.

Furthermore, the press-fitting jig 4 further includes a cylindrical columnar portion 41 extending coaxially with the truncated cone portion 40 from the large-diameter surface 40c of the truncated cone portion 40 toward the rear end side of the truncated cone portion 4. Since it is provided, when the truncated cone 40 bites into the ground 3, the inner peripheral wall 1a above the truncated cone 40 can be supported by the outer peripheral surface 41a of the cylindrical portion 41, and the recess 1 can be formed more reliably. ..

In the embodiment, the press-fitting jig 4 is press-fitted into the ground together with the expansion type steel pipe pile 2, and the press-fitting step of the expansion type steel pipe pile 2 and the forming step of the recess 1 are performed at the same time. An expansion type steel pipe pile may be press-fitted after forming a recess in the pipe.

Further, although the shape shown in FIG. 2 is shown as the press-fitting jig 4, the shape of the press-fitting jig is not limited to the shape shown in FIG. 2, for example, a cannonball shape, a polygonal pyramid shape, or a shape in which the top thereof is missing. Other tapered shapes may be used.

1 Recess 1a Inner peripheral wall 1b Void 2 Expansion type steel pipe pile 2a Pile head 3 Ground 4 Press-fit jig 40 Frustrated cone 40a Small diameter surface 40b Tapered outer surface 40c Large diameter surface 41 Column part 43 Insertion hole 5 High pressure fluid injection jig 6 Foundation

Claims (6)

The recesses formed in the ground and
An expansion type steel pipe pile press-fitted into the ground so that the pile head is located in the recess ,
A high-pressure fluid injection jig attached to the pile head in the recess is provided.
The recess, between the inner peripheral wall of the recess pile head is provided so as to have a gap for ensuring a space for mounting the high pressure fluid injection tool into the pile head,
An expansion type steel pipe pile press-fitting structure characterized in that the inner peripheral wall of the recess is composed of compacted or compacted soil. A step of press-fitting a tapered press-fitting jig into the ground and then removing the press-fitting jig from the ground to form a recess in the ground.
The process of press-fitting the expansion type steel pipe pile into the ground so that the pile head is located in the recess .
Including a step of attaching a high-pressure fluid injection jig to the pile head in the recess .
The recess, between the inner peripheral wall of the recess pile head is provided so as to have a gap for ensuring a space for mounting the high pressure fluid injection tool into the pile head,
A method for producing a pile-shaped reinforcing body, characterized in that the inner peripheral wall of the recess is composed of compacted or compacted soil. An insertion hole through which the pile head can be inserted is provided at the tip of the press-fitting jig.
The method for producing a pile-shaped reinforcing body according to claim 2, wherein the press-fitting jig is press-fitted into the ground together with the expansion type steel pipe pile in a state where the pile head is inserted into the insertion hole. 2. The present invention is characterized in that the press-fitting jig is provided with a truncated cone-shaped truncated cone portion having a small-diameter surface forming the tip of the press-fitting jig and a tapered outer peripheral surface. Item 3. The method for creating a pile-shaped reinforcing body according to item 3. The press-fitting jig is further provided with a cylindrical cylindrical portion extending coaxially with the truncated cone portion from the large-diameter surface of the truncated cone portion toward the rear end side of the press-fitting jig. The method for creating a pile-shaped reinforcing body according to claim 4, which is characterized. It is a press-fitting jig for press-fitting an expansion type steel pipe pile into the ground.
A truncated cone-shaped truncated cone having a small diameter surface and a tapered outer peripheral surface,
A cylindrical truncated cone extending coaxially with the truncated cone from the large diameter surface of the truncated cone is provided.
The small diameter surface is provided with an insertion hole through which the pile head of the expansion type steel pipe pile can be inserted, and the insertion hole extends to the inside of the columnar portion, and the inside of the columnar portion is described. The end surface of the insertion hole is provided,
With the pile head inserted into the insertion hole, the pile head is pressed into the ground together with the expansion type steel pipe pile to have an inner peripheral wall composed of compacted or compacted soil, and the pile head is located inside. A press-fitting jig characterized in that a recess to be formed is formed in the ground.

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