KR102540069B1 - Micropile equipped with a cone-shaped tip acupressure device considering the action distribution load during installation and its construction method - Google Patents

Abstract

According to the present invention, the pile body 10 of the long rod inserted into the drilling hole 1 of the ground; And a tip acupressure sphere 100 mounted on the front end of the file body 10; including, the tip acupressure sphere 100 is an extension extending in the plane direction (b) by the downward force (a) ( 110); And a pressure unit 120 that transmits the downward force (a) to the expansion unit 110; wherein the expansion unit 110 is formed in a conical shape with a cross section gradually increasing as it goes downward. file is provided.
According to the present invention, there is an effect of securing a high level of tip bearing capacity while maintaining the simple construction method of the existing micro pile by using the tip acupressure tool that extends from the lower surface of the drilling hole.

Description

Micropile equipped with a cone-shaped tip acupressure device considering the action distribution load during installation and its construction method}

The present invention relates to the field of construction, and more particularly, the tip of the micro pile is expanded from the bottom of the perforated hole to secure a high level of support for the tip of the micro pile. It relates to a micro pile and its construction method.

Micro piles refer to small diameter cast-in-place piles. Compared to general pile foundations, the construction method is simple and the cost is low, so it is used not only as a foundation for repair and reinforcement of various structures such as buildings and bridges, but also for seismic reinforcement of structures.

Since micro piles use small-diameter piles, the tip area of the pile body itself is very small, so it is difficult to expect the tip bearing capacity as a foundation. Accordingly, the bearing capacity for the upper load is characterized by relying only on the shear frictional force between the micropile and the ground.

In order to overcome the disadvantages of these micro piles, the construction of micro piles with only the tip extended is applied, but there is a burden of on-site construction, such as the need to construct a drilling hole with a larger diameter in order to insert the extended tip.

In addition, in the case of the conventional tip-extending micro pile, the upper portion of the extension is inverted during the extension of the tip, so that gradual expansion is impossible.

The present invention was derived to solve the above-mentioned problem of securing the front end bearing capacity of the conventional micro pile. However, it is to provide a micro pile equipped with a conical tip acupressure tool and its construction method considering the action distribution load during installation so as to secure a high level of tip support.

Another object of the present invention is a micro file equipped with a conical tip acupressure device considering the action distribution load during installation to form a holding structure so that the tip acupressure device does not depart from the end of the file body in the process of inserting the file body into the drilling hole, and It is to provide a construction method thereof.

Another object of the present invention is a cone-shaped tip acupressure device considering the action distribution load at the time of installation so that the expanded tip acupressure device can prevent the expansion area of the tip acupressure device from being reduced due to the acupressure weight being pushed upward due to the earth pressure in the surrounding area. It is to provide a micro pile equipped with and a construction method thereof.

Another object of the present invention is to provide a micro pile equipped with a conical tip acupressure tool considering the action distribution load during installation capable of resisting the pulling force applied to the pile body due to natural disasters such as strong wind and earthquake, and its construction method. .

Another object of the present invention is to prevent overturning of the upper part of the expansion part when the micro pile is inserted, and to secure a wider tip area when the extension part is maximally expanded to secure maximum tip bearing capacity, circumferential friction force, and pull-out resistance. It is to provide a micro pile equipped with a conical tip acupressure tool considering the action distribution load during installation and a construction method thereof.

According to one aspect of the present invention, the pile body 10 of the long rod inserted into the drilling hole 1 of the ground; And a tip acupressure sphere 100 mounted on the front end of the file body 10; including, the tip acupressure sphere 100 is an extension extending in the plane direction (b) by the downward force (a) ( 110); And a pressure unit 120 that transmits the downward force (a) to the expansion unit 110; wherein the expansion unit 110 is formed in a conical shape with a cross section gradually increasing as it goes downward. file is provided.

In this case, the acupressure unit 120 includes an upper body 121 having a coupling part coupled to the file body 10; It may be a micro file comprising a; and a conical acupressure weight 122 formed under the upper body 121.

In addition, the acupressure weight 122 may be a micro file characterized in that the length (f) of the cross section is formed in a shape gradually shortened toward the bottom.

In addition, the expansion part 110 is separated into a plurality of members 111, and forms an internal space 112 into which the acupressure weight 122 is drawn in a state in which the plurality of members 111 are coupled, The inner space 112 may be a micro file characterized in that it is formed in a shape corresponding to the shape of the acupressure weight 122.

In addition, the upper portion of the inner space 112 may be a micro file, characterized in that the locking jaw 113 is formed to prevent the upward departure of the acupressure weight 122.

In addition, the acupressure weight 122 may be a micro file, characterized in that for converting the downward force (a) into a horizontal force (c) acting in the horizontal direction (b).

In addition, the inner space 112 includes a first inner space 1121 into which the acupressure weight 122 is inserted; And it is formed below the first inner space 1121, and the plurality of members 111 gradually move away from the center of the inner space 112 by the horizontal force (c) provided by the acupressure weight 122. According to the second inner space 1122 into which the acupressure weight 122 is drawn out of the first inner space 1121; it may be a micro file characterized in that it includes.

In addition, the acupressure weight 122, the first acupressure weight coupled to the upper body 121 (1221); and a second acupressure weight 1222 coupled to the lower portion of the first acupressure weight 1121 and having a maximum diameter e smaller than the maximum diameter d of the first acupressure weight 1221. It may be a micro-file characterized by

In addition, when the first acupressure weight 1221 is drawn into the first inner space 1121, the second acupressure weight 1222 is drawn into the second inner space 1122, characterized in that the micro file can be

In addition, the tip acupressure tool 100 may be a micro file, characterized in that it further includes a fixing band coupling portion 115 formed by being depressed on the outer surface of the extension portion 110.

In addition, the tip acupressure tool 100 is mounted on the coupling part 112 when the fixing is performed, and a fixing band 114 for maintaining the coupled state of the plurality of members 111; micro pile characterized in that it further comprises can be

According to another aspect of the present invention, in the construction method of the micro pile, the first step of forming the drilling hole (1) (S100); The second step of introducing the file body 10 to which the tip acupressure device 100 is coupled into the drilling hole 1 so that the tip acupressure device 100 is seated on the bottom of the drilling hole 1 (S200); A third step of cutting off the fixing band 113 by providing a downward force (a) to the tip acupressure sphere 100 and moving the expansion part 110 away from the center of the inner space 112 (S300); and a fourth step (S400) of grouting the drilling hole 1.

In this case, the third step (S300) includes a step (S310) in which the lower end of the expansion part 110 presses the side of the perforation hole 1 and is drawn into the side part. It may be a construction method of a characteristic micro pile.

According to another aspect of the present invention, a building foundation constructed through the construction method of a micro pile is provided.

According to the present invention, there is an effect of securing a high level of tip bearing capacity while maintaining the simple construction method of the existing micro pile by using the tip acupressure tool that extends from the lower surface of the drilling hole.

According to the present invention, there is an effect that the tip acupressure tool does not escape from the end of the file body in the process of introducing the file body into the drilling hole using the engaging structure of the acupressure weight.

According to the present invention, the tip acupressure tool is rooted to the periphery, so there is an effect of increasing the compression effect of the main soil area as well as expanding the tip area.

According to the present invention, the problem of the expansion area of the tip acupressure sphere being reduced due to the acupressure weight being pushed upwards due to the earth pressure of the surrounding area can be prevented by using a jaw structure that blocks the upward movement of the acupressure point. It works.

According to the present invention, there is an effect capable of resisting the pulling force applied to the pile body due to natural disasters such as strong winds and earthquakes.

According to the present invention, there is an effect of preventing the upper part of the extension when the micro pile is inserted, and securing a wider tip area when the extension is maximally expanded to secure maximum tip bearing capacity, surface friction force, and pull-out resistance. there is.

1 to 4 are diagrams illustrating a process in which a tip acupressure tool of a micro file according to an embodiment of the present invention is expanded from a lower surface of a drilling hole.
Figure 5 is a view showing the structure of one section constituting the extension of the tip acupressure tool according to an embodiment of the present invention.
Figure 6 is an exploded view of the acupressure tool tip of the micro file according to an embodiment of the present invention.
7 to 11 are views showing a construction method of a micro pile according to an embodiment of the present invention.
12 is a view showing a principle in which a micro pile resists a pulling force according to an embodiment of the present invention.
13 is a view showing the structure of an internal space of a micro pile according to an embodiment of the present invention.
14 is a view showing the shape of grout poured into a filling space according to an embodiment of the present invention.

An embodiment of a micro pile equipped with a tip acupressure tool and its construction method considering the action distribution load during installation according to the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or Corresponding components are assigned the same reference numerals, and overlapping descriptions thereof will be omitted.

In addition, terms such as first and second used below are only identification symbols for distinguishing the same or corresponding components, and the same or corresponding components are not limited by terms such as first and second. no.

In addition, coupling does not mean only the case of direct physical contact between each component in the contact relationship between each component, but another configuration intervenes between each component so that the component is in the other configuration. It should be used as a concept that encompasses even the case of contact with each other.

1 to 4 are for explaining the structure of the tip acupressure tool of the micro file and the principle by which the tip acupressure tool expands according to an embodiment of the present invention.

The present invention relates to a micro file in which an extensible tip acupressure tool 100 is mounted on the tip of a file body 10.

The micro pile according to an embodiment of the present invention includes a long rod file body 10 inserted into a drilling hole 1 in the ground and a tip acupressure tool 100 mounted on the front end of the pile body 10 (Fig. One).

In this case, the tip acupressure tool 100 has an extension 110 that extends in the plane direction (b) by the downward force (a) and the acupressure unit 120 that transmits the downward force (a) to the extension 110. include

In this case, the expansion part 110 may be formed in a conical shape with a cross section gradually increasing as it goes downward.

When the extension 110 is formed in a cylindrical shape having the same diameter in the depth direction, the extension 110 cannot be expanded step by step according to the insertion of the file body 10, and the upper end of the extension 110 is overturned. It can be.

Accordingly, in the present invention, by adopting a conical shape in which the cross section gradually increases as the external shape of the expansion part 110 goes downward (in the depth direction) (refer to FIG. 4, it can be seen that the cross section b is larger than the cross section a) ), the tip of the expansion part 110 is firmly fixed to the target ground (weathered rock, weathered soil, etc.) by the wedge horizontal force, enjoying the effect of increasing the tip bearing capacity, as well as securing a higher level of pull-out resistance in terms of pull-out resistance There are features that make it possible.

This is to secure the front end area of the wide extension part 110 at a higher level in consideration of the fact that the earth pressure due to the surrounding soil increases toward the tip (lower end) of the extension part 110 . In addition, there is an effect of increasing the compression effect of the embedded ground to further increase the tip bearing capacity, surface friction force and pullout resistance of the micro pile.

The acupressure unit 120 includes an upper body 121 having a coupling portion coupled to the file body 10 and a conical acupressure weight 122 formed under the upper body 121.

The acupressure unit 120 converts some or all of the downward force (a) transmitted through the pile body (10) into a horizontal force (c) for the expansion unit 110. To this end, the acupressure weight 122 may be formed in a shape in which the length f of the cross section gradually becomes shorter toward the bottom (FIG. 2).

As can be seen in Figures 2 to 4, the expansion unit 110 expands the occupied space by moving the plurality of members 111 away from each other by the horizontal force (c) provided by the acupressure weight 122. Accordingly, the area of the tip of the micro pile is expanded to secure a high tip support force.

In addition, in general micro piles, it is difficult for the frictional force of the surface to contribute to the calculation of the bearing capacity of the micro pile, but the micro pile according to the present invention has the effect of compressing the soil of the main surface by extending the tip and sticking to the main surface, and as will be described later, the extension part 110 ) has a groove of the fixing belt coupling part 115 formed by recessing the outer surface, and as a result, a concave-convex shape is formed on the outer surface. Accordingly, it is possible to form a locking structure with the compressed main surface soil, thereby improving the frictional force of the main surface.

In addition, since the grouted shape along the drilling hole 1 is formed in a shape with an extended tip, it is possible to form a holding structure capable of resisting the pulling force of the micro pile.

As will be described later, since the upward movement of the acupressure weight 122 by the locking jaw 113 of the inner space 112 is restricted, the file body 10 and the tip acupressure tool 100 when resisting the pulling force of the micro pile behaves integrally (FIG. 12).

The expansion part 110 is separated into a plurality of members 111 (FIG. 6), and forms an inner space 112 into which the acupressure weight 122 is inserted in a state in which the plurality of members 111 are coupled.

The inner space 112 may be formed in a shape corresponding to the shape of the acupressure weight 122. If the shape of the inner space 112 is formed in a conical shape like the acupressure weight 122, the upper part of the inner space 112 is in contact with the periphery of the upper surface of the acupressure weight 122 so that the acupressure weight 122 escapes upward. A locking step 113 to prevent it may be formed (FIG. 4).

The inner space 112 and the acupressure weight 122 may be formed in a multi-stage structure.

Specifically, in the present invention, the inner space 112 refers to the inner space 112 formed at the top of the plurality of inner spaces 112 as a first inner space 1121, and the inner space 112 formed continuously to the bottom The second inner space 1122, the third inner space 1123, and the fourth inner space 1124 are named.

After the acupressure weight 122 is drawn into the first inner space 1121, when the first inner space 1121 is pushed outward by the horizontal force c provided by the acupressure weight 122, the first inner space The passage connecting the 1121 and the second inner space 1122 is widened, and accordingly, the acupressure weight 122 on the first inner space 1121 can be moved to the second inner space 1122 (Fig. 1, Fig. 2).

In this way, the acupressure weight 122 can be moved to the fourth inner space 1124 located at the lowest level of the inner space 112, and as the acupressure weight 122 moves downward, the plurality of members 111 Based on the center point of the inner space 112, it is gradually pushed outward.

If there is only one inner space 112, the plurality of members 111 pushed to the outside are provided with a compressive force toward the center of the inner space 112 again due to the earth pressure in the periphery, so that the tip of the expanded micro pile This shrinkage problem may occur.

In addition, when there is only one inner space 112, when a pulling force is provided to the micro file, the acupressure weight 122 is released to the outside of the inner space 112, so the file body 10 and the tip acupressure tool 100 are integrated. As such, there are problems that cannot be resisted.

In order to solve this problem, in the present invention, a plurality of continuous inner spaces 112 are provided to gradually expand the tip, while the tip acupressure tool 100 having a pull-out resistance to maintain the width of the tip once expanded to provide.

The micro file according to an embodiment of the present invention may also have a plurality of configurations of the acupressure weight 122 .

Specifically, the acupressure weight 122 is coupled to the lower portion of the first acupressure weight 1221 and the first acupressure weight 1121 coupled to the upper body 121, and is larger than the maximum diameter (d) of the first acupressure weight 1221. It may include a second acupressure weight 1222 having a smaller maximum diameter (e) (FIG. 1).

Accordingly, when the first acupressure weight 1221 is drawn into the first inner space 1121, the second acupressure weight 1222 may be drawn into the second inner space 1122.

In this case, as described above, the resistance to the pulling force can be further increased.

The micro pile according to one sealing of the present invention is connected to the inner space 112, and further includes a filling space 1125 formed below the inner space 112, but the filling space 1125 has a length (g) of the cross section It is formed uniformly, and when the acupressure weight 122 is drawn into the filling space 1125, an empty space may be formed around the front end of the acupressure weight 122.

In this case, as will be described later, when the grout is poured into the drilling hole 1, a grout fixing structure is formed as shown in FIG.

The tip acupressure tool 100 of the micro file according to an embodiment of the present invention may further include a fixing band coupling part 115 formed by being recessed in the outer surface of the expansion part 110 (FIG. 1).

The fixing strap 114 is fastened to the fixing strap coupling part 115, and in this case, the plurality of members 111 can maintain a coupled state.

The fixing band 114 is preferably made of an elastic body that can be broken when the expansion part 110 is expanded.

Hereinafter, a construction method of a micro pile according to an embodiment of the present invention will be described.

The construction method of the micro pile according to the present invention includes the first step of forming the drilling hole (1) (S100), and inserting the file body 10 to which the tip acupressure tool 100 is coupled into the drilling hole 1 to provide tip acupressure. The second step (S200) of allowing the sphere 100 to be seated on the bottom of the perforation hole 1 (S200), by providing a downward force (a) to the tip acupressure sphere 100 to break the fixing belt 113 and expand it as well. A third step (S300) of moving the portion 110 away from the center of the inner space 112 (S300) and a fourth step (S400) of grouting the perforation hole (1) may be included.

In addition, the third step (S300) may include a step (S310) in which the lower end (front end) of the expansion part 110 presses the side of the perforation hole 1 and is drawn into the side part.

Since the above has only been described with respect to some of the preferred embodiments that can be implemented by the present invention, as noted, the scope of the present invention should not be construed as being limited to the above embodiments, and the scope of the present invention described above It will be said that the technical idea and the technical idea together with the root are all included in the scope of the present invention.

1: perforated hole
10: file body
100: tip acupressure sphere

Claims (14)

A long rod pile body 10 inserted into the drilling hole 1 of the ground; and
It includes; a tip acupressure tool 100 mounted on the tip of the file body 10,
The tip acupressure tool 100,
An extension 110 extending in a planar direction (b) by downward force (a); and
Including; acupressure unit 120 that transmits the downward force (a) to the expansion unit 110;
The expansion part 110 is formed in a conical shape with a gradually increasing cross section as it goes down,
The acupressure unit 120,
An upper body 121 having a coupling part coupled to the file body 10; and
Including; a conical acupressure weight 122 formed on the lower part of the upper body 121,
The acupressure weight 122 is formed in a shape in which the length f of the cross section gradually shortens toward the bottom,
The expansion part 110 is separated into a plurality of members 111,
In the state in which the plurality of members 111 are coupled, an internal space 112 into which the acupressure weight 122 is drawn is formed,
The inner space 112 is formed in a shape corresponding to the shape of the acupressure weight 122,
An upper portion of the inner space 112 is formed with a locking jaw 113 to prevent the acupressure weight 122 from moving upward,
The acupressure weight 122 converts the downward force (a) into a horizontal force (c) acting in the horizontal direction (b),
The expansion part 110 expands the occupied space by moving the plurality of members 111 away from each other by the horizontal force c provided by the acupressure weight 122,
The inner space 112 is
A first inner space 1121 into which the acupressure weight 122 is inserted; and
It is formed below the first inner space 1121, and the plurality of members 111 gradually move away from the center of the inner space 112 by the horizontal force c provided by the acupressure weight 122. Including; a second inner space 1122 into which the acupressure weight 122 leaves the first inner space 1121 and enters,
The acupressure weight 122,
A first acupressure weight 1221 coupled to the upper body 121; and
A second acupressure weight 1222 coupled to the lower portion of the first acupressure weight 1121 and having a maximum diameter (e) smaller than the maximum diameter (d) of the first acupressure weight 1221;
A micro file, characterized in that it contains.
delete delete delete delete delete delete delete According to claim 1,
When the first acupressure weight 1221 is inserted into the first inner space 1121, the second acupressure weight 1222 is inserted into the second inner space 1122. Micro file.
According to claim 9,
The tip acupressure tool 100,
A fixing band coupling part 115 formed by being depressed on the outer surface of the expansion part 110;
A micro file, characterized in that it further comprises.
According to claim 10,
The tip acupressure sphere 100
A fixing band 114 attached to the coupling part 112 when the fixing maintains the coupled state of the plurality of members 111;
A micro file, characterized in that it further comprises.
In the construction method of the micro pile of claim 11,
A first step (S100) of forming the perforation hole (1);
The second step of introducing the file body 10 to which the tip acupressure device 100 is coupled into the drilling hole 1 so that the tip acupressure device 100 is seated on the bottom of the drilling hole 1 (S200);
A third step of cutting off the fixing band 113 by providing a downward force (a) to the tip acupressure sphere 100 and moving the expansion part 110 away from the center of the inner space 112 (S300); and
A fourth step (S400) of grouting the drilled hole 1;
Construction method of the micro pile, characterized in that it comprises.
According to claim 12,
The third step (S300) is
The lower end of the expansion part 110 presses the side of the drilling hole 1 and is drawn into the side part (S310);
Construction method of the micro pile, characterized in that it comprises.
A building foundation constructed through the construction method of the micro pile of claim 11.

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