KR20090095091A - Ditch of punching type and the method of executing the same - Google Patents

Abstract

A driven side ditch for drainage and a construction method thereof are provided to carry out construction easily and improve draining function and obtain safety of a slope by preventing outflow of soil. A driven side ditch for drainage(10) comprises an anchorage, a wing, a perforation, and a filter member. The anchorage(11) is pointedly formed downward at the lower end or a side wall(12) along the longitudinal direction. In the anchorage, a wedge-shaped fixation piece(11a) is formed on the upper end. The wing is horizontally extended from the top of the side wall to the outside. In the wing, a driven projection(15) is pointedly formed downward at the outside. A plurality of perforations(13) is formed along the longitudinal direction from the top of the side wall to drain seepage water in contact side between the ground and the gutter. The filter member thoroughly adheres all over the perforation in order to prevent inflow of soil through the perforation.

Description

Type drain hole and construction method {Ditch of punching type and the method of executing the same}

The present invention relates to a type drainage side opening and a construction method thereof, while the conventional drainage side opening has a larger width than the side opening, and is mounted through a side opening and backfilled with high quality soil, whereas the type is based on the base. In this way, the construction of the side gate minimizes the damage to the natural environment and significantly increases the work efficiency.

More specifically, the present invention relates to a type drainage side outlet which is installed to drain surface water during rainy season to improve the stability of the slope. The installation minimizes environmental damage and is fixed tightly to the ground by the fixing unit, so the installation is very stable and the drainage function can be improved by allowing the infiltration water to penetrate into the ground contacting the side opening. In addition, it is possible to secure the stability of the slope by preventing scour and sediment outflow of the surrounding ground is installed, and relates to a type drainage side port for easy construction and its construction method.

In general, when creating a site such as a road, railroad, or complex by cutting or stacking slopes, a V-type or U-shaped port is installed for the purpose of increasing the stability of the slope by inducing and draining surface water that descends to the slope. The concrete is made of concrete or synthetic resin (mainly polyethylene; hereafter called 'PE').

Conventional concrete sidewalls are difficult to handle with heavy structures and are difficult to replace when cracks or leaks occur.

In addition, the conventional PE material side weight is light, but a plurality of fixing holes are formed at a predetermined distance from the bottom surface to become a drainage passage by the side wall in order to prevent slippage and buoyancy with the installed ground, and fixing pins in these fixing holes It is installed on the ground by passing through it, and leakage occurs through the fixing hole in which the fixing pin is coupled, which hinders the stability of the inclined surface, and the state of fixing by the fixing pin was not firm, and work inconvenience was caused. After installation, foreign matters are caught by the fixing pins protruding from the bottom surface, so that it is difficult to secure water supply capacity.

As shown in Figure 11, the construction method of the conventional side opening proceeds in the order of trench, side opening installation, backfill, mainly by using a large excavator to pick a flat around the side installation location and excavate to a greater width than the side opening, the base is tilted In the case of a rough terrain, earthwork such as excessive cutting or fill must be preceded to select a flat land. When the excavation is completed, the side hole is mounted, and the side hole and the excavation surface are filled with high quality earth and sand to be backfilled, but most of them use the ground soil sand that has been dug and the portion to be backfilled is almost impossible. On the other hand, if the backfilling operation is not made surely, after construction, the infiltration water penetrates into the backfilled ground, which is relatively weaker than the original ground, or it is dug out due to rain, so that the unit units having a certain length are separated from each other and cannot function properly. This occurred.

In addition, since the infiltration water penetrating through the inside of the ground is blocked by the side wall of the side opening, the soil formed around the side wall of the side opening is directed to the wing portion which is in close contact with the earth's surface, and the soil around the side surface is swept together and the inside of the drain passage of the side opening. As the erosion occurs, scour occurs, and the scour area is already weak, so it is not long before the surface water, including the infiltration water, penetrates into the lower sidewall and penetrates the slope. There was a problem that the drainage function is lost, causing the slope of the slope.

In addition, in order to solve this problem, although the infiltration water blocking concrete is placed on the upper part of the backfill, the infiltration water that penetrates into the ground and flows into the side opening cannot be treated. It is true.

The present invention is to solve the above problems, the object is as follows.

First, by minimizing the excavation work required for the installation of the gutter, the gutter is installed regardless of the slope of the ground to minimize the damage to the natural environment and to provide an economical type drainage gutter.

Second, since there is no backfilling operation when installing the side port, there is no scour occurrence factor of the ground around the side of the ground due to the difference in the ground characteristics of the back ground and the backfilled part. To provide.

Third, by using the dedicated equipment, the side opening is constructed by type to secure the fixing part to the ground, ensuring durability by responding to the sliding caused by the side opening and buoyancy generated when the groundwater rises. It is to provide a construction method of the side mouth.

Fourth, by allowing the drainage of the infiltration water penetrating through the inside of the ground contacting the side opening, it is possible to prevent scour and sediment spillage of the surrounding ground where the side opening is installed, and to improve drainage function and to ensure the stability of the slope surface. It is to provide a type side drain.

Type-type drainage side opening according to the present invention for achieving the object as described above is characterized in that it has a fixing portion formed pointed downward in the longitudinal direction on the side wall or the bottom of the side opening.

In addition, the side wall is formed to have a cross-sectional shape to be a drain passage, the outer surface of the side wall is characterized in that the wedge-shaped fixing piece protrudes to the outside of the side wall at a predetermined portion.

In addition, the wedge-shaped fixing piece may be used by attaching a panel having a rigid triangular or square pyramid shape or rigidity downward depending on the material.

In addition, a plurality of holes are formed in the upper side wall of the side opening along the longitudinal direction, characterized in that further comprises a filter material attached to the hole.

In addition, further comprising a wing portion extending horizontally outward from the upper portion of the side wall, characterized in that the outer side of the wing portion is formed with a sharply bumped downwards in the longitudinal direction.

In addition, it is connected to the upper end of the side wall, it is characterized in that it further comprises a connecting wing portion is formed with a plurality of pores, the filter material is attached to the back.

The construction method of the type | mold drainage side opening which concerns on this invention is characterized by installing said side opening by type.

In the above construction method, the step of displaying the ground surface stop operation and the excavation location line; Forming a trench groove along a location line; Mounting a side opening in the trench groove; Inserting a type protector into the mounted side opening; It is characterized in that it comprises a step of fixing the side opening to the trench groove by applying a blow to the upper portion of the type protector and removing the type protector from the side opening.

In addition, the trench groove is excavated using a dedicated excavator equipped with a drilling drum having a cross-sectional shape of the side opening.

In addition, the type guard is characterized in that the pressing body is formed so as to abut the inner surface of the side wall of the side opening, characterized in that the upper portion is formed of a flat plate.

It characterized in that it further comprises the step of fixing to the ground by connecting the connection blade to the upper end of the side wall of the side opening.

According to the present invention, the following effects can be obtained.

First, since the type drainage side opening according to the present invention is constructed on a ground plate by a dedicated excavator without having to stop the installation space on a flat surface, it minimizes the paper required for the installation of the side opening, thereby dramatically damaging the natural environment and economic efficiency. There is.

Secondly, since the fixing part formed at the lower end of the side opening is very firmly fixed to the ground, it prevents slippage caused during construction of the side opening, and there is no fear of lifting or losing by excellent even after a long time, and durability of the side opening The effect can be dramatically increased.

Third, the pores and filter material formed on the side wall of the side opening prevents scour and sediment leakage of the surrounding ground, thereby improving drainage function and ensuring stability of the slope.

Fourth, according to the construction method according to the present invention, in the installation of the side opening does not need to backfill around the side of the mouth, the land surface surrounding soil due to the difference in the ground characteristics of the ground and backfilled part when the surface water inflow, which is a problem of the conventional side Since there is no scouring factor, there is an effect of maintaining a stable drainage function and increasing the stability of the slope.

Fifth, in addition to the excavation work of the side cross-sectional shape, additional processes such as flattening, backfilling, and concrete placing for blocking penetration of the upper part of the backfill do not occur, thereby simplifying construction and improving work efficiency.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only this embodiment to make the disclosure of the present invention complete and to those skilled in the art to fully understand the scope of the invention It is provided to inform you.

1 is a perspective view of the type-type drainage side opening according to the present invention, Figure 2 is a side cross-sectional view of the type-type drainage side opening according to the present invention.

As shown, the side opening 10 according to the present invention is produced to a certain length, the basic configuration is formed in the lower end or side wall 12 of the side opening pointed downwardly 11 in the longitudinal direction downward will be.

As shown in Figure 1, the fixing unit 11 is formed at the lower end of the side port 10 should have a rigidity to minimize the penetration resistance to the ground when the type and to prevent damage to the side port.

It may further comprise a wing portion 14 extending horizontally outward from the top of the side wall (12).

In addition, a plurality of holes 13 may be formed along the longitudinal direction at the upper side of the side wall 12, and the filter material 16 may be attached to the entire holes 13.

The hole 13 is to enable the drainage of the infiltration water at the contact surface of the ground and the side opening 10, the filter material 16 is to prevent the soil from flowing through the hole (13).

The filter material 16 is preferably used to filter fine earth and sand, it has a myriad of pore layers can be used a non-woven fabric with excellent water permeability, the method of attaching the side wall 12 except for the hole 13 The adhesive can be applied to a portion of the outer surface of the panel.

As shown in FIG. 1, the upper end of the fixing unit 11 increases the frictional force between the side opening 10 and the ground after installation, and fixes the side opening in close contact with the ground, and increases the resistance to buoyancy ( 11a) may be formed, and a plurality of fixing pieces 11a may be formed at predetermined intervals, but the present invention is not limited thereto, and the fixing pieces 11a may be formed continuously along the longitudinal direction.

In addition, the wedge-shaped fixing piece (11a) may be used by attaching a panel with a pointed triangular or square pyramid shape or stiffness downward depending on the material, it can be formed in various shapes and shapes.

Here, the cross-sectional shape of the side opening 10 according to the present invention may be formed in a 'V' type or 'U' type, and the like, such as concrete, steel or synthetic resin material (polyethylene; hereinafter 'PE'.) Production is possible.

In addition, it is preferable to form the nailing protrusion 15 sharply downward in the longitudinal direction on the outer side of the wing portion 14.

Meanwhile, the filter material 16 is easily attached to the entire hole 13 formed on the side wall 12, and the surface of the attached filter material 16 and the outer surface of the lower side wall 12 coincide with each other. In order to prevent the filter material 16 from flowing down from the outer surface of the side wall 12 by the earth pressure, the hole 13 formed at the bottom of the upper side wall 12 is formed. At the lower portion, the support jaw 12a may be formed to support the lower portion of the filter material 16 along the longitudinal direction.

Reference numeral H1 shown in FIG. 2 denotes a 'water passage' having an effective cross section required for drainage, and shows a range from the bottom surface of the side opening 10 to the bottom hole 13 located at the bottom. H2) is a 'pore' having a filter material 16 attached to a hole 13 to prevent scour and sediment inflow of the ground in contact with the side port 10, and has a hole at the top of the upper side of the side wall 12. It shows the range between (13) and the bottom hole (13).

In FIG. 2, the ranges of the water passage (H1) and the hole (H2) are shown to be similar, but in actual application, the size should be determined according to the inflow of infiltration and surface water.

Figure 3 is a view showing the main device for installing the type drainage side opening according to the present invention, (A) the drawing shows a state of working the trench using a dedicated excavator, (B) and (C) drawings Is a side view showing an excavation drum mounted on a dedicated excavator, (B) drawing is a V-type drilling drum, (C) is a U-type drilling drum, and (D) is a side cross-sectional view of the type guard.

The side opening 10 according to the present invention can be easily installed in a type by excavating only the cross section of the side opening 10 shape on the base while minimizing the environmental damage when construction on the slope.

Here, the 'type' means to install on the ground by hitting the side opening (10) itself, or to install using a type protector described later in the side opening (10).

To this end, a dedicated excavator 20 that can improve the basic trench method for installing the side port 10, and a type protector 30 and a type machine that can minimize damage to the side port 10 are used.

As schematically illustrated in FIG. 3A, the dedicated excavator 20 performs a digging operation for installing the side opening 10.

The dedicated excavator 20 is equipped with an excavation drum 21 that can excavate the trench groove in the cross-sectional shape of the side opening (10).

The drilling drum 21 forms a V-shaped groove by using the V-type drilling drum 21a shown in (B) of FIG. 3, or uses a U-type drilling drum 21b such as (C). It can form a mold groove.

The type guard 30 shown in (d) of FIG. 3 is manufactured to a certain length, so that the side mouth 10 can be firmly inserted and fixed to the ground while preventing damage to the side mouth 10 according to the present invention. It is to.

The type guard 30 is composed of a pressing body 31 which presses against the inner surface of the side opening 10, that is, the pressing body side 32 is formed to be in close contact with the inner surface of the side opening 10. .

Here, the inner bottom surface of the side opening 10 and the lower end of the pressing body 31 may be formed to have a smooth curved surface, because the lower end of the pressing body 31 is in close contact with the bottom surface of the side opening 10 so that the pressing is performed. This is to prevent damage by being applied.

In addition, the upper portion of the pressing body 31 is formed of a flat plate 33, both sides of the flat plate 33 is in close contact with both side wing portions 14 of the side opening 10, the wing in the flat plate 33 The portion in close contact with the portion 14 becomes the wing portion pressing surface 34 while pressing the wing portion 14 of the side opening 10, the flat plate 33 is in close contact with the inner surface of the side opening (10) The even pressure is exerted on the pressing body 31 as a whole.

On the other hand, the type guard 30 is inserted into the inside of the side port 10 by hitting the flat plate 33 by a type machine (not shown) such as a hammer or a vibrator, the fixing portion formed in the side port 10 (11) acts to be firmly embedded in the ground.

Figure 4 is a block diagram showing the construction sequence of the type-type drainage side opening according to the present invention, Figure 5 is a view for explaining the construction method of the type-type drainage side opening in accordance with the present invention, Destroyed state, (B) drawing is a side opening, (C) drawing is a type guard inserted into the inside, (D) the drawing shows a state of hitting the type using a type protector.

Side opening 10 according to the present invention is a simple type construction using the dedicated excavator 20, the type protector 30 and the type described above, with reference to Figures 4 and 5 for the construction order and construction method The explanation is as follows.

First, as a step (S1) for the ground stop operation and the operation to display the trench location line, this step is to flatten the ground surface, and then the position for installing the side opening 10 as equipment for displaying the trench location line It is a task to clearly specify.

Next step (S2), using the dedicated excavator 20 to excavate along the position line to form the trench groove 1 as shown in Fig. 5 (a).

Then, as shown in (b) of FIG. 5, the side opening 10 is mounted on the trench groove 1 (S3).

As shown in FIG. 5 (C), the type guard 30 is inserted into the side opening 10 mounted to the trench groove 1 (S4). At this time, since the pressing body 31 constituting the type guard 30 is formed in the same manner as the inner surface of the side opening 10, the type guard 30 is inserted and at the same time as shown in (d) of FIG. The press body 31 naturally comes into close contact with the inner surface of 10 by its own weight.

In the state in which the type protector 30 is inserted into the side opening 10, the upper surface of the type protector 30 is hit by using a type machine on the upper surface of the flat plate 33. Including the 32, the side opening 10 in close contact with the pressing body 31 is firmly fixed to the ground while being lodged in the trench groove 1 by the fixing unit 11 (S5).

Here, the side opening 10 according to the present invention does not have to work, such as backfilling and backfilling ground compaction and scour prevention concrete casting after the excavation, the reason is the cross section of the side opening 10 by a dedicated excavator 20 While forming only the trench groove 1 in the shape, while the fixing portion 11 formed in the side opening 10 by the type guard 30 and the type machine is embedded in the ground wing 14 of the side opening 10 This is because the outer surface of the side wall 12 is naturally folded into the trench groove 1 while pressing the ground by), and on the other hand, as the type guard 30 hits the type protector with the type, This is because the ground ground around the side opening 10 is improved by compacting the ground to be improved than the existing ground ground.

On the other hand, the wing 14 of the side opening 10 is embedded in the ground by the nailing protrusion 15, and the wing 14 is not lifted from the ground.

In the case of installing the side opening 10 in the flat, after the above-described step to complete the construction through the step (S7) of removing the type guard 30 from the side opening (10).

By the way, in the case of installing the side opening 10 on the inclined land side connection construction including the step (S6) to connect the connection wing portion 14A to the side opening 10, as shown in another embodiment shown in FIG. You can complete

6 is a view showing a state of completing the construction by the construction method of the side opening for drainage according to the present invention.

The present invention can minimize the environmental damage by minimizing the excavation of the ground required to install the side opening using a dedicated excavator regardless of the terrain, and when the material is made of PE, the weight is light, so the construction is convenient and easy to settle Due to the part 11, the construction can be carried out by type, and the wedge-shaped fixing piece 11a of the fixing part 11 is hung on the ground and firmly fixed, thereby preventing slippage and buoyancy due to earth pressure. have.

In addition, the surface water is guided through the wing 14 connected to the upper side of the side wall 12, and the water penetrating through the inside of the ground E, which is in contact with the side wall 11, passes through the filter material 14. It is naturally guided to 13) and drained. At this time, while the permeated water passes through the filter material 14, the earth and sand do not escape to the oil hole 13 by the filter material 14, and only the water penetrated into the oil hole 13 is drained.

Since the permeate water is naturally drained through the hole 13, the scour and sediment leakage of the surrounding ground on which the side opening 10 is installed may be prevented, thereby improving drainage and securing stability of the slope.

7 is a view showing a perspective view of the type drainage side opening applicable to the terrain of the slope as another embodiment of the present invention, Figure 8 is a side cross-sectional view showing the installation state of FIG.

7 and 8 is a side opening 10A applicable to the topography of the slope, the side opening 10 according to the embodiment described with reference to FIGS. 1 and 2 is installed on the flat surface of the slope There is no problem in this, but it is not suitable for the slope where the terrain is inclined.

Accordingly, the side opening 10A according to another embodiment includes all of the fixing unit 11, the side wall 12, the hole 13, and the filter material 16 configured in the side opening 10 according to an embodiment. There is a difference in that only the wing part is separated from the side port 10A and formed by the connection wing part 14A.

Specifically, the side opening 10A is formed by combining the connection wing portions 14A separated without the wing portions integrally formed as in one embodiment according to the inclination of the trench groove and the ground.

The connecting wing portion 14A has a plate-like structure in which a plurality of holes 13a are formed, and as shown in FIG. 8, a filter material 16 may be attached to the back surface which is in contact with the ground. Can be cut to length.

As a method of connecting the connecting wing portion 14A, one end of the connecting wing portion 14A is opposed to the upper end portion of the side wall 12 at a predetermined interval along the longitudinal direction of the side wall 12 using the connecting pin 17. It can be fixed and attached.

Here, as shown in Fig. 8, the connecting wing portion 14A is connected to both side walls 12 at the slope of the slope. Although not shown in the drawings, depending on the terrain on which the side opening 10A is installed, that is, when installing from the bottom of the slope, the connecting wing 14A may be connected only to one side wall 12 which is in contact with the slope. to be.

On the other hand, the connecting wing 14A is preferably made of a soft synthetic resin material to be in close contact with the ground.

As shown in FIG. 8, the other end of the connection blade portion 14A can be installed in close contact with the ground using a fixing pin 18 or an anchor 18a on the ground.

Accordingly, as described above, the surface water and the infiltration water are guided and drained into the side opening 10A, thereby improving the drainage function and ensuring the stability of the slope.

Thus, the side opening 10A applied to the steep slope can also be installed by the construction method described above, and the type guard 30 can be used without the wing pressing surface 34.

On the other hand, the connecting wing portion 14A may be attached to an existing side opening installed below the slope to prevent scouring of the slope, and may be applied alone to ensure durability and slope stability of the existing side opening by inducing and draining water.

9 is a perspective view of a type drainage side opening that can be applied to an area close to the impermeable layer having strong adhesive force as another embodiment of the present invention, and FIG. 10 is a side cross-sectional view showing an installation state of FIG. 9.

If the base is close to the impermeable layer, there is little generation of permeated water, so that the pores shown in the above-described embodiments hardly play a role, so that side holes 10B without pores can be used as shown in FIG. 9. The side opening 10B can also be simply installed by the construction method described above.

As described above with reference to the drawings illustrating the type-type drainage side opening and the construction method according to the present invention, the present invention is not limited by the embodiments and drawings disclosed herein, the present invention Of course, various modifications may be made by those skilled in the art within the scope of the idea.

1 is a perspective view of a type side drain for drainage according to the present invention;

Figure 2 is a side cross-sectional view of the type drainage side opening according to the present invention,

Figure 3 is a view showing the main device for installing the type drainage side opening according to the present invention, (A) the drawing shows a state of working the trench using a dedicated excavator, (B) and (C) drawings Is a side view showing an excavation drum mounted on a dedicated excavator, (B) drawing is a V-type drilling drum, (C) is a U-type drilling drum, (D) a drawing is a side cross-sectional view of a type guard,

Figure 4 is a block diagram showing the construction sequence of the type-type side opening for drainage according to the present invention,

Figure 5 is a view for explaining the construction method of the type drainage side opening according to the present invention, (a) the drawing is a state of exploding, (b) the drawing is a side opening, (c) the drawing is inside the side opening The type guard is inserted in the state, (D) the drawing is a state of hitting the type protector using a type device,

6 is a side cross-sectional view showing a state in which the construction is completed by the construction method of the type-type drainage side opening according to the present invention;

7 is a view showing a perspective view of the type-type drainage side opening that can be applied according to the terrain of the slope as another embodiment of the present invention;

Figure 8 is a side cross-sectional view showing the installation state of FIG.

9 is a further embodiment of the present invention, a perspective view of a type drainage side opening that the base can be applied to a region close to the impermeable layer is strong adhesive force,

10 is a side cross-sectional view showing the installation state of FIG.

11 is a view showing a construction example of a conventional side mouth.

<Explanation of symbols for the main parts of the drawings>

10, 10A, 10B: side opening 11: fixing unit

12: sidewall

12a: filter material base 13, 13a: hole

14 wing 14A: connecting wing

15: nailing projection 16: filter material

17: connecting pin 18: fixing pin

18a: anchor 20: dedicated excavator

21: excavating drum 22: vertical holding device

30: type guard 31: pressure body

32: pressure body side 33: flat plate

34: wing pressing surface

Claims (12)

Side drainage having a fixing part 11 formed pointed downward along the longitudinal direction. Side wall (12) is formed so as to have a cross-sectional shape to be a drain passage, the side surface for drainage characterized in that the fixing piece (11a) protrudes in a predetermined portion on the outer surface of the side wall (12). The method of claim 1, The fixing unit (11) forms a lower portion of the side opening (10) (10A) (10B), side wall for drainage characterized in that the side wall (12) is formed extending from both sides of the upper portion of the fixing unit (11). The method of claim 2, Cross section of the fixing piece (11a) is a drainage side, characterized in that the upper portion is wedge-shaped wider than the lower portion. The method of claim 2 or 3, The side opening for drainage further comprises a plurality of holes formed in the longitudinal direction in the upper portion of the side wall (12), the filter material 16 is attached to the hole. The method of claim 2 or 3, Further comprising a wing portion (14) extending horizontally outward from the top of the side wall 12, the outer side of the wing portion 14 is sharply pushed downwards 15 in the longitudinal direction downwards Drainage side, characterized in that formed. The method of claim 2 or 3, It is connected to the upper end of the side wall (12), the drainage side opening, characterized in that it further comprises a connecting wing portion (14A) is formed with a plurality of holes (13a) and the filter material 16 is attached to the back. The construction method of the drainage side opening characterized by installing the side opening (10) (10A) (10B) according to any one of claims 1 to 4. The method of claim 8, Performing a step of displaying the ground stop operation and the trench location line (S1); Forming a trench groove 1 along the location line (S2); Mounting side openings (10, 10A, 10B) in the trench groove (1) (S3); Inserting the type guard 30 into the mounted side openings 10, 10A, 10B (S4); Fixing side openings (10) (10A) (10B) to the trench groove (1) by hitting the upper portion of the type guard (30) (S5); And Construction method of the side opening for drainage, characterized in that it comprises the step (S7) of removing the type guard (30) from the side opening (10) (10A) (10B). The method of claim 9, The excavation groove 1 is excavated using a dedicated excavator 20 equipped with an excavating drum 21 having a cross-sectional shape of the side openings 10, 10A, 10B. Way. The method of claim 9, The type guard 30 is a pressing side 31 is formed so as to abut against the inner surface of the side wall 12 of the side openings 10, 10A, 10B, the upper side is characterized in that formed by a flat plate 33 Construction method. The method of claim 9, The method of installing the drainage side opening, characterized in that it further comprises the step of connecting the connection wing portion (14A) to the upper end of the side wall (12) of the side opening (10A) fixed to the ground.

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