KR101438306B1 - Top typed pile comprising lid and method of reinforcing ground using the same - Google Patents

Abstract

A top file including an upper lid is disclosed. Wherein the top file including the top cover includes a horn-shaped hollow top portion which is narrowed downward and a hollow file main body portion extending a predetermined length below the top portion; And a top cover coupled to the top opening of the top portion of the top file, the top top files adjacent to each other when the top file is installed on the ground, And a fastening portion for connecting the upper top covers to the surrounding top covers to be arranged and arranged.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a top type pile including a top cover,

The present invention relates to a top type file including a top top cover in addition to a conventional top type file, and a method of constructing a soft foundation using the top type file.

Generally, a foundation method using a factory-made concrete top-type pile is a method of laying a top-like concrete pile on the foundation ground surface of a structure. It is widely used as a part of a foundation in a soft foundation. It has a reinforcing effect on the ground, Dispersed and transferred to the ground, thereby exhibiting an effect similar to that in the case of improving the base portion and its vicinity.

In this method, a square reinforced concrete reinforced concrete reinforced concrete pile is laid next to the ground surface of the foundations, which is also used for securing the position of the piles. The concrete reinforced concrete pile is laid on the reinforced concrete pile , The bottom space of the file is filled with crushed stone and fully plastered.

The concrete top type pile used in the soft ground includes a top portion having a circular upper surface and a ring portion protruding from the center of the top surface, a file main body portion extending long in the center of the top portion of the top portion, And a tip end portion of the file having a conical bottom face extending from the lower portion.

Conventional factory-made top and top-mounted top-type piles constructed as described above have a conical top portion and a file main portion with a 45-degree slope so that the upper load acting on the lower portion from the upper portion is directed to the four sides of the ground There is a very high soil reinforcement effect due to dispersion.

Prior to the present application, the inventor of the present invention filed an application 10-2011-0136105 (an assembly of a ground reinforcement structure and a construction method thereof) on December 16,

When such a top type file is used in the field, concrete pouring and pouring concrete pouring are separately performed in the top type container, which increases the construction period and construction cost.

In addition, the top file is provided with a fastening portion around the top file to couple a plurality of top file. However, there has been a problem in that it is not easy to produce a top-shaped file due to a problem of designing a complicated mold for processing a fastening portion around the top-shaped file, and the manufacturing cost is increased.

The inventor of the present invention has added a top cover to a top file to solve such a conventional problem, and a fastener is installed on the top cover. With this configuration, the construction period and the construction cost can be shortened, and the existing top type file in which the fastening portion is omitted can be used as it is.

There is provided a top file including an upper cover according to an embodiment of the present invention, which includes a hollow top portion having a conical shape that narrows downward and a hollow file main body portion having a predetermined length extended below the top portion , Top file; And a top cover coupled to the top opening of the top portion of the top file, the top top files adjacent to each other when the top file is installed on the ground, And a fastening portion for connecting the upper top covers to the surrounding top covers to be arranged and arranged.

According to an embodiment of the present invention, the fastening portion includes two or more projections formed around the top cover; And at least two receiving grooves formed around the top cover and capable of receiving the protrusions, the protrusions and the receiving grooves defining protrusions and receptacles between the top covers when the top- The grooves can be engaged and fastened.

Alternatively, the fastening portion may include four or more receiving grooves formed around the top cover and facing each other, And a detachable member mounted in the receiving groove and detachable from the receiving groove and the top cover, wherein a receiving groove is formed between the top covers when the top type file is installed, The detachable opening can be inserted and fastened.

For example, the top cover may include a plurality of top covers arranged in a first direction and a second direction perpendicular to the first direction, each of the top covers having a plurality of arranged top covers, And the top cover made of a network structure can be coupled to a plurality of top file.

According to an embodiment of the present invention, the top cover may include an insert portion that can be inserted and mounted along an inner circumference of the upper open portion; And an exposed portion located above the insertion portion and exposed to the outside of the upper opening portion when the insertion portion is inserted into the upper opening portion. In this case, the projecting portions and the receiving grooves are formed around the exposed portion.

According to another embodiment of the present invention, a notch portion extending in the longitudinal direction along the top axis of the top-like pile is formed around the top opening of the top portion. In this case, when the top cover is engaged with the top opening of the top portion, the projection is received into the notch.

According to another embodiment of the present invention, the top portion is formed around the top portion and includes a plurality of openings formed in the inward direction of the top portion.

A method of constructing a soft ground according to an embodiment of the present invention is a top cover removable from a top type file, wherein top top files adjacent to each other at the time of installing the top type file are arranged around the top top cover And a top cover provided with fastening portions for connecting with other top top covers in order to be arranged and arranged. A method of constructing a soft ground using a top type file including the top cover, the method comprising: installing a top type file on a soft ground; Providing an upper lid and engaging and engaging the fastening portions between neighboring top lids; Crushing and compaction steps; Removing the top cover; And placing and curing the concrete on the inside of the top type file and on the outside of the top type file filled with the crushed stone.

1 is an exploded perspective view of a top cover and a top file of a top file including a top cover according to a first embodiment of the present invention.
Fig. 2 shows a top file and a top top cover shown in Fig. 1 combined. Fig.
FIGS. 3A and 3B are top plan views of a top cover for illustrating embodiments of fastening portions of a top file including a top cover according to Embodiment 1 of the present invention. FIG.
FIG. 4 is a plan view of a top-top cover including a top cover according to a first embodiment of the present invention in a state where a plurality of top covers are coupled.
Fig. 5 shows another embodiment of the fastening portion of the top type file including the top cover according to Embodiment 1 of the present invention.
FIG. 6 shows a state in which the top covers are joined by the fastening portion shown in FIG. 5;
Fig. 7 shows a top structure of a top-top cover including a top cover according to the first embodiment of the present invention.
8 is an exploded perspective view illustrating a top type file including the top cover according to the second embodiment of the present invention.
Fig. 9 shows a state in which the top file and the file top cover shown in Fig. 8 are engaged.
10 is a plan view showing a state in which a plurality of top files having an upper cover according to a second embodiment of the present invention are coupled.
11 is an exploded perspective view illustrating a top type file including a top cover according to a third embodiment of the present invention.
Fig. 12 shows a flowchart of a conventional soft ground construction method.
FIG. 13 is a flowchart of a soft ground construction method using a top type file including a top cover according to an embodiment of the present invention.
Fig. 14 shows a state in which a top file including an upper cover is installed on a soft ground according to the order of the soft ground construction method of Fig. 13;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a top type file including an upper cover according to an embodiment of the present invention and a method of constructing a soft ground using the top type file will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a top file including a top cover in addition to a conventional top file, and a method of constructing a soft foundation using the top file. The top file including the top cover is described first. Let me explain it in order.

* Top file with top cover

Example 1

The top file including the top cover of the present invention includes a top file (100) and a top top cover (200).

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a top file and a top top lid according to a first embodiment of the present invention. Fig. The top file 100 has a shape that narrows downward as shown in FIG. 1, and is called a top file because it looks like a top. The top file 100 is divided into a top 120 and a main body 110.

The top 120 has a hollow hollow shape and a conical shape that narrows downward. The top 120 has a rounded circular shape when viewed in plan view. These circular shapes are exemplary and may have a polygonal shape such as triangular, square, pentagonal, hexagonal, octagonal, rectangular, cross, twelve, pentagonal and octagonal.

The file body portion 110 extends from the lower portion of the top portion and also has a hollow hollow shape. Although the body portion is illustrated as having a shape that narrows downward, this form is merely exemplary.

Such a top file is made of a material such as polyethylene (PE), polystyrene (PS), acrylonitrile butadiene styrene copolymer (ABS), expandable poly-styrene (EPS) , Iron plate, wire, metal, non-metal, wood, recycled PE and recycled PP.

Fig. 2 shows a top file and a top top cover shown in Fig. 1 combined. Fig. The top cover 200 should be large enough to cover the entire open top of the top portion of the top file and preferably has a shape corresponding to that of the top portion of the top portion. For example, when the top of the top portion is a polygonal shape such as a circle, a triangle, a rectangle, a pentagon, a hexagon, an octagon, a square, a cross, a twelve, a pentagon, May also have a corresponding shape.

It is preferred that the top cover 200 fit snugly into the top of the top portion of the top file. This is because the top cover 200 serves to prevent the crushed stones from entering into the hollow portion of the top file when crushing the top of the top file.

As shown in FIG. 1, the top cover 200 can be inserted along the inner circumference of the top of the top cover 200 so that the top cover 200 and the top of the top cover of the top- And may include an insertion portion 201 and an exposed portion 202. The outer periphery of the insertion portion 201 can be fitted to each other by almost matching the size and shape with the inner periphery of the top portion. The exposed portion 202 is positioned above the insertion portion 201 and is exposed to the outside of the upper opening when the insertion portion is inserted into the upper opening. The outer circumference of the exposed portion 202 is formed so as to be substantially equal in size and shape to the outer circumference of the top portion, whereby the exposed portion 202 is formed larger than the width or diameter of the insertion portion 201. The top cover 200 is coupled to the top 120 of the top file 100 when the top file 100 is installed and after the top file 100 is installed, Is separated from the top 120 of the top file 100 and reused.

On the other hand, a fastening portion is provided around the top top cover 200. The fastening part includes a top cover 200 coupled to the top 120 of the top file 100 so that when the top file is installed, the top files are standing upright and perpendicular to the ground, .

According to one embodiment of the top cover including the top cover according to Embodiment 1 of the present invention, the fastening portion includes two protruding portions 211 formed around the top cover 200 and two receiving grooves 212 . The two receiving grooves 212 can receive the protrusions 211. The two protrusions 211 may be located in a direction not facing each other or facing each other and two receiving grooves 212 may be located in a direction not facing each other or in a direction facing each other . The projecting portion 211 and the receiving groove 212 extend in the longitudinal direction along the central axis of the top cover 200.

FIGS. 3A and 3B are top plan views of a top cover for illustrating embodiments of fastening portions of a top file including a top cover according to Embodiment 1 of the present invention. FIG.

The shapes of the protrusions 211 and the receiving grooves 212 may be variously formed without any particular limitation. For example, the protrusion 211 may have a rectangular shape in plan view as shown in FIG. As another example, the projection 211 'may have a trapezoidal shape in plan view as shown in FIG. 3A. As another example, the protruding portion 211 '' may include a circular portion 211 '' b formed at the ends of the linear portion 211 '' a and the linear portion 211 '' a when viewed in plan, ) May be combined. The receiving grooves 212, 212 ', 212' 'may have shapes corresponding to the shapes of these protrusions 211, 211', 211 ''.

FIG. 4 is a plan view of a top-top cover including a top cover according to a first embodiment of the present invention in a state where a plurality of top covers are coupled.

4, when the top file is constructed by the projections 211 and the receiving grooves 222, the projections 211 are inserted into the receiving grooves 222 in the vertical direction to form the projections 211 and the receiving grooves 222 are engaged with each other so that the adjacent file top covers 200 are engaged. As a result, the file top covers coupled to each other are not separated from each other unless the file top cover is lifted up to the top, so that a firm bonding force can be maintained. Thus, the top-shaped files may be erected perpendicular to the ground to maintain the arranged shape.

FIG. 5 shows another embodiment of the fastening portion of the top type file including the top cover according to Embodiment 1 of the present invention, and FIG. 6 shows a state in which the top cover is fastened by the fastening portion shown in FIG.

Alternatively, the fastening portion may be configured to include four receiving grooves 222 and a plurality of attaching / detaching holes 221 formed in the periphery of the top cover 200 as shown in FIG. In this case, the four receiving grooves 222 are located facing each other in the file upper cover 200. The receiving groove 222 may have a rectangular shape in plan view as shown in Fig. 5, and in another example, the shape of the projection 211 ', 211' 'described with reference to Figs. 3A and 3B They may be the same and similar shapes. The plurality of attachment / detachment openings 221 may be vertically inserted into the four receiving grooves 222 and have shapes corresponding to the shapes of the receiving grooves 222.

The four receiving grooves 222 and the plurality of attaching / detaching ports 221 couple the neighboring file top covers 200 when the top file is installed. That is, as shown in FIG. 6, when a plurality of the top-shaped files 100 are arranged in the lateral direction and the longitudinal direction, the four receiving grooves 222 formed in the respective file top covers 200 correspond symmetrically with each other, The insertion / removal ports 221 are inserted into and fitted into the receiving grooves 222 corresponding to each other.

The top file including the top cover according to the first embodiment of the present invention does not combine the top files adjacent to each other when the top file 100 is installed, The upper portions of the file upper covers 200 are coupled to each other so that the upper portions of the file upper covers 200 are firmly coupled to each other. As a result, the upper files 200 are vertically arranged and arranged .

Thereby, it is not necessary to process a portion for joining the top-shaped files 100 to each other when the top-shaped file is installed around the top-shaped file 100, so that the top-like file 100 can be easily manufactured, And the top cover 200 can be combined with a conventional top file that has been manufactured in the past.

Therefore, the top cover 200 may be used in combination with a conventional top cover file, and if necessary, the top cover 100 may be additionally manufactured to cover the top cover 100 with the top cover 200, And can be used in combination with the above.

Fig. 7 shows a top structure of a top-top cover including a top cover according to the first embodiment of the present invention.

On the other hand, the top cover 200 includes a plurality of top covers 200 along a first direction (for example, the longitudinal direction) and a second direction (for example, the lateral direction) perpendicular to the first direction Each of the top covers arranged and arranged in plurality may be configured to have a network structure in which edges are integrally formed with one another. In this case, the projecting portion 211 and the receiving groove 212 may be installed at the edge of the top cover 200 having a network structure, which are opposed to each other or not opposed to each other.

When the top cover 200 is constructed in a network structure, the top cover 200 can be coupled to a plurality of top cover files 100 at a time, whereby the top cover 200 can be connected to the top cover 100 ) Can be shortened.

Example 2

FIG. 8 is an exploded perspective view for explaining a top file including the top cover according to the second embodiment of the present invention, and FIG. 9 shows a state in which the top file and the file top cover shown in FIG. 8 are combined.

Referring to Figs. 8 and 9, the top file including the top cover according to the second embodiment of the present invention includes a top file 300 and a top top cover 400. Fig.

The top file 300 includes a top portion 320 and a file body portion 310 and the top portion 320 includes a notch portion 321.

The top cover 400 includes a fastening portion provided around the top cover 400. The fastening portion includes two protrusions 411 formed around the top cover 400, And two receiving grooves 412 formed in the direction facing the protruding portions 411. [ In addition, the top cover 400 has the exposed portion 202 of the top cover 200 described with reference to FIG. 1 omitted, and is configured in the same or similar form as the insertion portion 201, And is entirely inserted into the top opening of the top portion 320 when engaged.

The top portion 320 of the topsheet 300 includes the notch portion 321 and the top portion of the topsheet 400 includes the exposed portion 202 of the topsheet 200 described with reference to Figure 1, The top cover 300, the top cover 400, the protruding portion 411 of the coupling portion and the receiving groove 412 are formed in the same manner as the top file 100, The protrusion 211, and the receiving groove 212, the detailed description thereof will be omitted. Hereinafter, the notch portion 321 will be mainly described.

The notch portion 321 is formed around the upper opening of the top portion 320 of the top file 300 and extends in the longitudinal direction along the top axis of the top file 300. The shape of the notch 321 is not particularly limited and may be a shape corresponding to the circumference of the protrusion 411. The notch portion 321 receives the protrusion 411 when the top cover 400 is inserted into the upper opening of the top cover 320. The protrusion 411 is then received by the notch portion 321, And the receiving groove 412 may be opposed to the notch portion 321 on the inside of the top portion 320.

10 is a plan view showing a state in which a plurality of top files having an upper cover according to a second embodiment of the present invention are coupled.

10, when the top cover 400 is attached to the top file 300, the top 411 of each top cover 400 includes a top file 300 Through the notch portion 321 of each of the notched portions 321 and the receiving recesses 412 opposed to the notched portions 321. Thereby, the top files 300 are coupled to each other.

The top file including the top cover according to the second embodiment of the present invention is different from the top file including the top cover according to the first embodiment of the present invention in that the top top cover 400 covers the top of the top file 300, The notched portion 321 must be machined to accommodate the protruding portion 411. Since the notched portion 321 is processed by a simple operation that partially cuts the upper opening portion of the top portion 320, The file 300 is relatively easy to manufacture.

Also, since the projecting portion 411 of the top cover 400 is coupled with the receiving groove 412 through the top portion 320 of the top file 300, when the top file 300 is installed, 300 are coupled and fixed to each other by the protruding portion 411. Therefore, the top-shaped pile 300 and top cover 400 can be more firmly coupled.

Example 3

11 is an exploded perspective view illustrating a top type file including a top cover according to a third embodiment of the present invention.

11, the top file including the top cover according to the third embodiment of the present invention includes a top file 500 and a top top cover 600, and the top portion 520 of the top file 500 A plurality of openings 521 are formed.

The top file 500 and the top top cover 600 are the same as or similar to the top file 100 and the top top cover 200 described with reference to FIGS. 1 to 3A, and thus a detailed description thereof will be omitted. A plurality of openings 521 formed in the top portion 520 will be mainly described.

A plurality of openings 521 formed in the top portion 520 of the topical pile 500 pass through toward the inside of the top portion 520. The openings 521 may be arranged in a regular or irregular shape. The opening 521 allows the crushed stones to be adhered to the periphery of the top type file 500 and the concrete to be filled into the top type file 500 to be adhered thereto during the construction of the top type file 500.

Therefore, the top-like file including the top cover according to the third embodiment of the present invention can increase the adhesion of the top-shaped file 500 and the crushed stone outside the top-shaped file 500 upon installation of the top- .

* Construction method of soft ground using top type file including top cover

The currently used soft ground construction method is as follows. FIG. 12 is a flow chart of a method of constructing a soft ground according to the prior art, which includes a top type file installation step (S121); Installing and connecting upper and lower connecting bars (S122); Concrete pouring step S123; Concrete curing step (S124); Crushing and compaction step (S125); And a cast concrete pouring and curing step (S126).

The filler is filled in the inner hollow portion of the top-type pile. At least one of the heavy material, the recycled material, the natural material, and the light material is filled in the filler. Generally, when a top type file is installed in a site, a top type file is installed, and after connecting with a connecting reinforcing bar, concrete is poured, and after curing, crushed stone is filled. In order to prevent the crushed stones from entering the hollow part of the top type pile, concrete must be poured first, cured, and then crushed stone padded.

In this case, typically based on a 500m ² area, the assembly and installation steps of the top-type file 1, is within the concreting step top type file 1, the concrete curing step in the top-type file 1, the stone fill and compaction step And 1 day, and the casting of the foreshock concrete and curing step takes 3 days, and the total construction period is 7 days in total.

Meanwhile, in the conventional process of filling the crushed stones, the crushed stones are filled up to the height of the top of the top type pile. In the process of placing the foreclosed concrete, the top of the top type pile and the top type pile are poured over the top of the crushed stones. . Therefore, the cast concrete pouring and curing step (S126) is necessarily required after the crushing and filling step (S125).

In order to prevent the construction period from becoming longer and to prevent the entrance of crushed stone into the top type file, when a soft top is constructed using a top type file including a top top cover according to an embodiment of the present invention, Work is shortened.

FIG. 13 is a flowchart of a soft ground construction method using a top type file including a top top cover according to an embodiment of the present invention. FIG. 14 is a top view Shows the state where the file is installed on the soft ground.

Referring to FIG. 13, a soft ground construction method using a top type file including an upper cover includes the steps of installing a top type file on soft ground (S131); (S132) of engaging and engaging the fastening portions between the adjacent top covers with the upper cover installed; Crushing and compaction step (S133); Removing the top cover (S134); (S135) placing and curing the concrete on the inside of the top type file and on the outside of the top type file filled with the crushed stone.

Particularly, in the crushed stone filling and compaction step (S133), the crushed stone can be filled only at a predetermined height without filling the entire periphery of the topile pile 100. For example, as shown in FIG. 14, only the height of the file body portion 110 of the top file 100 can be filled. Thus, even if the crushed stones are filled only by the height of the file body portion 110, the top-shaped piles 100 can be kept vertical to the ground after the top cover is removed.

When the concrete is placed and cured (S135) on the inside of the top type file and on the outside of the top type file and the crushed stone is filled, the top type file 100 is transferred to the top of the top type file 100, And can act as abandoned concrete with the layer.

Since the concrete is poured into the inside of the top type pile 100 and the crushed stone at the same time after filling and grinding the crushed stone, the pouring and curing process of the poured concrete can be omitted.

In this case, the step of installing the top top cover on the top type pile on the basis of the area of 500 m ² , the step of assembling and installing the top type pile is one day, the step of filling and compacting the crushed pile is one day, It takes three days to pour and cure the concrete above the crushed stone inside the top type file and outside the top type file, so the total construction period takes 5 days in total. This results in a shorter period of two days than the construction period of the existing top file. That is, when the construction is performed according to the present invention, the time reduction of about 30% in the entire construction time can be achieved.

Also, as mentioned above, since the casting and curing process of abandoned concrete can be omitted, there is an advantage that the material cost is reduced and consequently the construction cost is reduced.

Claims (8)

A topical file, wherein the topical file comprises a horn-shaped hollow top portion that tapers downwardly and a hollow file body portion that extends a predetermined length below the top portion;
A top top cover coupled to the top opening of the top portion of the top file; And
And a fastening portion for connecting with the adjacent top covers, around the top cover,
Wherein the upper top covers are connected to each other by the fastening part so that the top side files adjacent to each other when the top type file is installed on the ground are erected and arranged in a state of being perpendicular to the ground,
Top file. The method according to claim 1,
Wherein the fastening portion includes at least two projections formed around the top cover; And at least two receiving grooves formed around the top cover and capable of receiving the protrusions,
Characterized in that the projection and the receiving groove are engaged and fastened between the top covers when the top type file is installed by the projecting portion and the receiving groove.
Top file. 3. The method of claim 2,
The top-
An insertion portion which can be inserted and mounted along an inner periphery of the upper opening portion; And
And an exposed portion located above the insertion portion and exposed to the outside of the upper opening portion when the insertion portion is inserted into the upper opening portion,
Characterized in that the protrusions and the receiving grooves are formed around the exposed portion.
Top file. 3. The method of claim 2,
A notch portion extending in the longitudinal direction along the top axis of the top-like pile is formed around the top opening of the top portion,
Characterized in that the projection is received in the notch when the top cover is engaged with the top opening of the top portion.
Top file. The method according to claim 1,
The fastening portion
Four or more receiving grooves formed around the top cover; And
And a detachable portion mounted in the receiving groove and detachable from the receiving groove and the top cover,
Wherein a receiving recess is formed between the top covers when the top type file is installed, and the attaching / detaching holes are inserted and fastened in receiving grooves corresponding to each other.
Top file. 6. The method according to any one of claims 1 to 5,
The top cover may be arranged in a plurality of directions along a first direction and a second direction perpendicular to the first direction, and each of the top covers may be arranged to have a network structure in which edges are integrally formed by being in contact with each other ,
Characterized in that the network top top cover is coupled to a plurality of top-
Top file. 6. The method according to any one of claims 1 to 5,
Characterized in that the top portion includes a plurality of openings formed around the top portion and formed in the inside direction of the top portion.
Top file. delete

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