KR102745912B1 - Anchor expansion type ground reinforcement pile and its construction method - Google Patents

Abstract

The present invention relates to a pile for ground reinforcement with an expandable anchorage section and a construction method thereof, which enables stable anchorage of a perforated hole at the tip of a nailing steel pipe or micropile for ground reinforcement, thereby improving work efficiency.
The present invention for realizing this is characterized by a configuration including: a pile body (10) having threads processed on the outer surface to a predetermined length so that it can be inserted into a perforation hole (110) of ground (100); a fastening nut (20) forming a female screw portion (21) so that it can be fastened to the front end of the pile body (10); a support plate (60) welded and fixed to the lower surface of the fastening nut (20); a plurality of expansion members (30) provided at predetermined intervals in a radial shape on the lower portion of the support plate (60); a finishing plate (40) coupled to support the ends of each of the expansion members (30); and a breaker (50) welded to a predetermined height on the inner side of the finishing plate (40) to limit the expansion force of the expansion members (30).

Description

{Anchor expansion type ground reinforcement pile and its construction method}

The present invention relates to a pile for ground reinforcement, and more specifically, to an anchorage-expandable ground reinforcement pile structure and a construction method thereof for improving the anchorage efficiency of a tip of a nailing steel pipe or micro pile inserted into a ground drilled hole for ground reinforcement.

In general, structures such as buildings are constructed on a strong foundation, but if the structure is constructed on soft ground or if groundwater flows or a cavity is formed under the foundation, the structure may sink and tilt.

When subsidence occurs in a structure constructed in this way, methods such as injecting cement or mortar into the ground to reinforce the foundation have been mainly used. However, this method has the problem that it is difficult to ensure construction quality, and it is only effective in suppressing additional damage to the structure, so the effect of reinforcing the foundation is weak. In addition, if subsidence has already progressed significantly, it is difficult to see the reinforcement effect.

Accordingly, recently, a method has been widely used to firmly reinforce and repair the foundation of a structure by drilling a vertical hole through the floor slab of the foundation structure to the ground, installing nailing steel pipes or micropiles, filling it with cement mortar, and grouting it.

In particular, when constructing a structure in an area where there is a risk of subsidence, a method is used to improve the bearing capacity of the ground by constructing the piles described above in the foundation.

Meanwhile, micro piles are a method of forming small-diameter, cast-in-place piles by drilling to a specified depth using small-scale drilling equipment, assembling and installing piles and reinforcing bars, and then grouting using a pump. They are structures buried in the ground in soft ground or sloped areas to prevent structures from rising and sinking due to ground compression and tension and to improve lateral pressure or ground strength.

These micropiles are not only applied when constructing foundation piles for new structures such as towers or transmission towers, but they are also applied to repair or reinforce existing foundations, increasing earthquake resistance and being applied regardless of the type of ground or conditions of the stratum, so they are being constructed a lot recently.

However, in the prior art, there was a problem that the tip of a micropile inserted into a ground perforation hole had fluidity due to the free space of the perforation hole, making it difficult to stably fix the tip.

Republic of Korea Patent Registration No. 1943185 (Registered on January 22, 2019) Republic of Korea Patent Registration No. 2560642 (Registered on July 24, 2023)

The present invention has been proposed to improve the problems in the above-mentioned prior art, and has the purpose of providing an expandable structure capable of stably fixing a perforated hole at the tip of a nailing steel pipe or micropile, thereby improving the efficiency of grouting work for ground reinforcement.

In order to achieve the above object, the present invention is characterized by comprising: a pile body having a screw thread processed on an outer circumference to form a predetermined length so that it can be inserted into a ground borehole; a fastening nut forming a female screw portion so that it can be fastened to a front end of the pile body; an expansion member provided with a plurality of radially spaced pieces on one side of the fastening nut; a finishing plate connected to support one end of the expansion member; and a breaker welded to form a predetermined height on the inner side of the finishing plate to limit the expansion force of the expansion member.

In addition, the expansion member is characterized by having an anchor plate having a plate shape in which the width gradually increases toward the end, and a folded portion formed at a certain angle at the end of the anchor plate to facilitate outward expansion, and a cutting groove formed symmetrically on both sides of the folded portion.

The present invention's anchorage-type ground reinforcement pile enables stable anchorage of a perforated hole at the tip of a nailing steel pipe or micropile for ground reinforcement, thereby improving work efficiency.

In particular, it shows the advantage of improved fixation stability due to expansion of the fixation part of the pile tip by the impact force of the head.

Figure 1 is a structural diagram of the outer appearance of a reinforcing pile tip according to one embodiment of the present invention.
Figure 2 is a perspective view of the bottom surface of the reinforcing pile of the present invention.
Figure 3 is a side structural drawing of a reinforcing pile of the present invention.
Figure 4 is a cross-sectional structural diagram of a reinforcing pile of the present invention.
Figure 5 is a detailed structural diagram of an expansion member in the present invention.
Figure 6 is a diagram showing a reinforcing pile of the present invention inserted into a perforation hole.
Figure 7 is a diagram showing a state in which a reinforcing pile of the present invention is expanded within a perforation hole.
Figure 8 is a diagram of a reinforcing pile structure according to another embodiment of the present invention.
Figure 9 is a cross-sectional structural diagram of a main body according to another embodiment of the present invention.
Figure 10 is an enlarged view of part A of Figure 9.
Figure 11 is a detailed structural diagram of an elastic reinforcement member in another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the attached drawings.

The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to more completely explain the present invention to a person having average knowledge in the art.

Accordingly, the shapes of components, etc., depicted in the drawings may be exaggerated in order to emphasize a clearer description. It should be noted that in each drawing, the same components are sometimes depicted with the same reference numerals. In addition, detailed descriptions of functions and configurations of known technologies that are judged to unnecessarily obscure the gist of the present invention may be omitted.

First, the configuration of the pile for ground reinforcement with an expansion type anchorage according to one embodiment of the present invention is as follows through FIGS. 1 to 5.

In the present embodiment, the ground reinforcement pile comprises a pile body (10) in the form of a nailing steel pipe or micro pile having threads machined on the outer surface to a predetermined length so that it can be inserted into a perforation hole (110) formed by drilling into the ground (100), a fastening nut (20) having a female screw portion (21) formed so that it can be fastened to the tip of the pile body (10), a support plate (60) welded and fixed to the lower surface of the fastening nut (20), a plurality of expansion members (30) provided at predetermined intervals in a radial shape on the lower portion of the support plate (60), a finishing plate (40) coupled to support the ends of each of the expansion members (30), and a breaker (50) welded to a predetermined height on the inner side of the finishing plate (40) to limit the expansion force of the expansion member (30).

The above-mentioned expansion member (30) is formed of an anchor plate (31) having a plate shape in which the width gradually increases toward the middle, and a folded portion (32) is formed at a certain angle at the middle of the anchor plate (31) to facilitate expansion outward, and a cut groove (33) is formed symmetrically on both sides of the folded portion (32).

Meanwhile, it can be confirmed that a plate insertion groove (41) is formed in the closing plate (40) so that welding fixation can be performed while the end of the anchor plate (31) is inserted, and that the breaker (50) has a cylindrical shape with an open top.

Let us examine the operational effects according to the construction of the expansion type ground reinforcement pile of the present invention having such a configuration.

In this embodiment, the ground reinforcement micro pile is constructed and installed by inserting the micro pile into a drilled hole after drilling the ground. At this time, since an anchorage expansion member is combined with the lower part of the micro pile, the tip can be anchored more stably.

That is, at this time, when the expansion member (30) coupled to the tip of the pile body (10) as shown in Fig. 6 is inserted into the perforation hole (110) of the ground (100) and strikes the rear end of the micro pile to transmit force, the expansion member (30) expands as shown in Fig. 7 and becomes fixed inside the perforation hole (110).

In particular, it can be seen that the anchor plate (31) of the present invention has a plate shape in which the width gradually increases toward the middle, and a folded portion (32) is formed at a certain angle to facilitate outward expansion at the middle, and a cut groove (33) is formed on both sides and in the center of the folded portion (32), so that the expansion deformation toward the outside can be more easily performed.

In addition, since a cylindrical breaker (50) is provided protruding at a certain height on the closing plate (40), it has the advantage of limiting the expansion deformation of the anchor plate (31) and preventing the occurrence of a breakage phenomenon of the bent portion (32) due to rapid deformation.

In this way, with the expansion member (30) settled, the micro pile packer section filling and packer section expansion steps are performed, and then the ground reinforcement work is sequentially performed by filling the inside of the perforation hole (110) with grouting injection material.

Therefore, the expansion-type ground reinforcement pile of the present invention exhibits the effect of improving work efficiency by enabling stable fixation of a perforated hole at the tip of a nailing steel pipe or micropile for ground reinforcement.

In particular, it shows the advantage of improved fixation stability due to expansion of the fixation part of the pile tip by the impact force of the head.

Meanwhile, Fig. 8 shows a configuration according to another embodiment of the present invention, in which a fastening nut (20') is additionally welded and fixed to the closing plate (40) to enable continuous connection of the file body (10').

With this configuration, an expansion member (30) can be formed at the file connection portion, so that not only the tip portion can be fixed, but also the pile stop portion can be fixed inside the perforation hole.

In addition, FIGS. 9 to 11 illustrate another embodiment of the present invention, in which a silicone rubber (51) is provided inside a breaker (50) in a form in which it protrudes upward to a certain height, and the upper surface of the silicone rubber (51) is configured to have a curved shape, and an elastic reinforcing material (52) is embedded inside, in which a plurality of horizontal plates (52a) are connected in a multi-layered form by a vertical pin (52b) at the center, and an elastic spring (53) is connected to the lower portion of the elastic reinforcing material (52).

In addition, a protective layer (54) is formed by coating the upper surface of the silicone rubber (51), and it is preferable that the protective layer (54) be a mixed composition of 10 to 30 wt% of sodium silicon fluoride, 5 to 20 wt% of nitrobenzene sulfonic acid, 20 to 40 wt% of epoxy resin, 5 to 10 wt% of naphthylmonic acid, 1 to 10 wt% of sodium hexanitro cobaltate, 10 to 20 wt% of diisonitroamine, 5 to 15 wt% of naphthyl glyoxal, and 1 to 10 wt% of polyvinyl acetal.

With this configuration, since the cylindrical breaker (50) is filled with silicone rubber (51) in a curved protrusion shape at the top, primary elastic support can be achieved during the lowering process of the support plate (60) according to the expansion movement of the expansion member (30), and secondary elastic support can be achieved by the elastic reinforcing material (52) and elastic spring (53) forming a multi-layer horizontal plate (52a) structure inside, thereby improving the breaker function.

In addition, since a protective layer (54) is formed as a thin film coating on the upper surface of the silicone rubber (51), cracks on the rubber surface can be prevented.

In particular, since the protective layer (54) contains a mixture of sodium silicon fluoride and nitrobenzene sulfonic acid, the coating durability can be improved, naphthylmonic acid performs a catalytic function for epoxy resin, sodium hexanitrocobaltate suppresses bubble generation during the coating process, thereby improving the coating density, and diisonitroamine and polyvinyl acetal perform a lubricating function to prevent oxidation and contamination of the protective layer (54), respectively.

And, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the reinforcing pile structure of the present invention can be implemented in various ways by those skilled in the art.

However, such modified embodiments should not be understood individually from the technical spirit or scope of the present invention, and such modified embodiments should be included within the appended claims of the present invention.

10: File body 20: Fastening nut
30: Extension member 31: Anchor plate
32: bend 33: cut groove
40: Finishing plate 41: Plate insertion groove
50 : Breaker 60 : Support plate
100 : Ground 110 : Sky hole

Claims (6)

A pile body (10) with screw threads machined on the outer surface to a certain length so that it can be inserted into a perforation hole (110) of the ground (100);
A fastening nut (20) that forms a female screw portion (21) so that it can be fastened to the tip of the above file body (10);
A support plate (60) welded and fixed to the lower surface of the above fastening nut (20);
A plurality of expansion members (30) are provided at regular intervals in a radial shape on the lower part of the above-mentioned support plate (60);
A finishing plate (40) that is combined to support the end of each of the above extension members (30);
A breaker (50) that is welded to a certain height on the inner side of the above-mentioned closing plate (40) to limit the expansion force of the expansion member (30);
A composition comprising:
The above-mentioned expansion member (30) is formed of an anchor plate (31) having a plate shape in which the width gradually increases toward the middle, and a folded portion (32) is formed at a certain angle at the middle of the anchor plate (31) to facilitate expansion outward, and a cut groove (33) is formed symmetrically on both sides of the folded portion (32).
A ground reinforcement pile with an anchorage expansion type, characterized in that a plate insertion groove (41) into which an end of an anchor plate (31) can be inserted is formed in the above-mentioned closing plate (40), and the above-mentioned breaker (50) has a cylindrical shape with an open upper portion. delete delete In claim 1,
A ground reinforcement pile with an expansion type anchorage, characterized in that a fastening nut (20') is additionally welded and fixed to the above-mentioned closing plate (40) to enable continuous connection of the pile body (10'). In claim 1,
An anchorage-type expandable ground reinforcement pile characterized in that the inside of the breaker (50) is provided with silicone rubber (51) in a form that protrudes upward to a certain height, the upper surface of the silicone rubber (51) is configured to have a curved shape, and an elastic reinforcing material (52) is embedded inside, which has a structure in which a plurality of horizontal plates (52a) are connected in a multi-layer form by a vertical pin (52b) at the center, an elastic spring (53) is connected to the lower portion of the elastic reinforcing material (52), and a protective layer (54) is formed by coating the upper surface of the silicone rubber (51), and the protective layer (54) is formed by a mixed composition of sodium silicofluoride, nitrobenzenesulfonic acid, epoxy resin, naphthylmonic acid, sodium hexanitrocobaltate, diisonitramine, naphthyl glyoxal, and polyvinyl acetal. In constructing a ground reinforcement pile according to any one of claims 1, 4, and 5,
A method for constructing a ground reinforcement pile with an expansion anchorage portion, characterized in that after inserting the pile body into a ground drilled hole, a striking force is applied to the pile head so that the expansion member expands inside the drilled hole and the tip is anchored.

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