KR102614935B1 - Easy dam - Google Patents

Abstract

Easy Dam is provided. The Easy Dam includes an expansion part containing an expansion material that expands while absorbing water; It may include a wing portion formed in a plate shape at an end of the expansion portion.

Description

Easy Dam

The present invention relates to an easy dam that forms a dam by stacking a plurality of layers.

Currently, urban areas are covered with asphalt, concrete, and sidewalk blocks, which make it difficult for rainwater to penetrate through the ground surface.

Therefore, during rainfall, most of the rainwater does not penetrate into the soil below the ground surface and flows into rivers or sewage treatment plants through storm drains or sewer pipes.

Therefore, if the amount of rainwater to be treated through drainage facilities exceeds due to heavy or concentrated rain, damage such as backflow of rainwater, surface subsidence, etc., as well as river flooding if rainwater flows into the river all at once, occurs.

However, there are many practical difficulties in expanding drainage facilities or improving rivers to improve the rainwater treatment ability.

For this reason, when constructing a new building, efforts are being made to solve the problem of rainwater being drained at once by storing and treating rainwater that flows into the roof or grounds of the building in a separate storage tank.

However, if the amount of rainwater to be treated through drainage facilities exceeds the amount due to heavy rain or concentrated rain flowing into the roof of the building or the ground, the rainwater may flow into the building's entrance door, parking lot, shutter door, etc. due to backflow of rainwater and surface sinking. In order to prevent it from flowing into the room all at once, it is blocked with mops or sandbags, but it is only a temporary measure and there is no way to stop the rainwater that rushes in in an instant, so problems such as sinking of the room are repeated every year. .

In addition, in order to prevent water from entering the gap of the door or the entrance of the building, gunny bags filled with sand are placed to prevent the inflow of water. However, the bulky bag of the gunny bag is large, so there are problems with storage and transportation, and there are also problems such as storage and transportation in the gap of the door or the entrance of the building. Although it is possible to prevent the inflow of water to some extent by stacking gunny bags on the side, it is not possible to prevent water from flowing into the gap between the gunny bags, so ultimately there is a limit to preventing the inflow of water into the building.

Korean Utility Model Publication No. 0471868 discloses a water blocking block containing a superabsorbent polymer.

Korean Utility Model Bulletin No. 0471868

The present invention is intended to provide an easy dam that is easy to store and install, and can reliably block water or change the path of water.

The Easy Dam of the present invention includes an expansion part containing an expansion material that expands while absorbing water; It may include a wing portion formed in a plate shape at an end of the expansion portion.

The wing portion may include a flexible material that covers the expansion portion when the expansion portion is stored and is bent to unfold from the expansion portion when the expansion portion is used.

The Easy Dam of the present invention can have a similar effect to a so-called sand bag, which expands when it absorbs water and blocks the flow of water.

Easy Dams can be installed urgently in emergency situations where there is a need to block or alter the flow of water. Alternatively, the Easy Dam may be installed in advance at a set location to prevent water intrusion in an emergency situation.

In reality, a plurality of easy dams can be stacked up and down or arranged sideways to form a type of dam or water barrier that blocks water. In order for the barrier to function normally, the stacking and arrangement of the Easy Dam must be performed normally. However, a situation may occur where the Easy Dam, which normally maintains a thin board-like shape, expands rapidly through water absorption and deviates from the initially intended stacking or arrangement state.

According to this, some Easy Dams may collapse, making it difficult to form and maintain a normal water barrier.

In addition, even if the normal stacking and arrangement state is maintained, a situation may occur in which the Easy Dam located in some areas that receive intensive water pressure collapses. Even in this case, it may be difficult to form and maintain a normal water barrier.

To solve this problem, a method is required to ensure that the stacking state and arrangement of multiple Easy Dams are as initially designed regardless of expansion, and to ensure that the bonding state between the stacked/arranged Easy Dams is firmly established.

In order to simultaneously satisfy these requirements, the easy dam of the present invention may be provided with wings.

The easy dam is provided with an expansion portion that absorbs water and substantially expands. In this case, the wing portion may be connected to the side of the expansion portion and disposed on another adjacent expansion portion.

The wing portion disposed on the other expansion portion is pressurized by the self-weight of the other expansion portion, and the position may be fixed due to the pressing. Accordingly, the position of the specific expansion part connected to the wing can also be maintained constant regardless of whether it is expanded or not. Through this, the plurality of Easy Dams can maintain their initially designed stacking and arrangement state.

The Easy Dam of the present invention realistically reflects the wing formation plan and wing protection plan.

Figure 1 is a schematic diagram showing the Easy Dam of the present invention.
Figure 2 is a schematic diagram showing the wing portion in an unfolded state.
Figure 3 is a schematic diagram showing the Easy Dam in a water-absorbed state.
Figure 4 is a schematic diagram showing the installation method of the Easy Dam.
Figure 5 is a schematic diagram showing an easy dam with four wings.
Figure 6 is a schematic diagram showing the connection portion between the expansion part and the wing part.
Figure 7 is a cross-sectional view showing the connection portion between the expansion part and the wing part.
Figure 8 is a schematic diagram showing the edge of the expansion part.
Figure 9 is a process diagram showing the manufacturing method of the easy dam of the present invention.
Figure 10 is a schematic diagram showing one side of the wing portion.
Figure 11 is a schematic diagram showing the other side of the wing portion.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

In this specification, duplicate descriptions of the same components are omitted.

Also, in this specification, when a component is mentioned as being 'connected' or 'connected' to another component, it may be directly connected or connected to the other component, but may be connected to the other component in the middle. It should be understood that may exist. On the other hand, in this specification, when it is mentioned that a component is 'directly connected' or 'directly connected' to another component, it should be understood that there are no other components in between.

Additionally, the terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention.

Also, in this specification, singular expressions may include plural expressions, unless the context clearly dictates otherwise.

In addition, in this specification, terms such as 'include' or 'have' are only intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more It should be understood that this does not exclude in advance the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

Also, in this specification, the term 'and/or' includes a combination of a plurality of listed items or any of the plurality of listed items. In this specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Additionally, in this specification, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

Figure 1 is a schematic diagram showing the Easy Dam of the present invention. Figure 2 is a schematic diagram showing the wing portion 130 in an unfolded state. Figure 3 is a schematic diagram showing the Easy Dam in a water-absorbed state. Figure 4 is a schematic diagram showing the installation method of the Easy Dam.

The easy dam shown in the drawing may include an expansion part 110 and a wing part 130.

The expansion portion 110 may contain an expansion material that expands while absorbing water. The expansion part 110 may include a material that allows external water to flow inside. Water flowing into the expansion unit 110 is absorbed into the expansion material, and the expansion material can expand up to 100 times its usual volume.

As an example, the expansion material may include SAP (Super Absorbent Polymer). The expandable material may be in the form of powder or small granules.

The expansion part 110 may include a flexible material whose shape can be deformed while expanding along with the expansion of the expansion material included therein.

The expansion part 110 made of flexible material may have the shape of a flat plate or a flat cloth.

When the internal expansion material absorbs water and expands, the expansion part 110 may swell and change into the shape of a pillow or sand bag.

Meanwhile, the expansion material in the form of powder or granules may not be evenly distributed inside the expansion unit 110 and may be tilted to one side during the transport, storage, and installation process. Of course, even if the expansion material concentrated on one side expands first due to the limitation of the size of the internal space provided by the expansion part 110, due to the limitation of the allowable space, the expansion material concentrated on one side of the expansion part 110 expands during the expansion process. It can be naturally distributed to the other side of (110). Because of this, the final appearance of the expansion part 110 can follow the initial design value. However, in the early stages of expansion, a situation may frequently occur in which a specific portion of the expansion is not performed properly.

Due to the phenomenon in which the entire expansion part 110 does not expand evenly and some parts expand first, when a plurality of easy dams are stacked up and down (in the direction of gravity) or arranged left and right (in the direction parallel to the ground), a specific easy dam is The designated position of the dam may be distorted and the dam may deviate from the designated position. If some Easy Dams are twisted or deviated from their designated positions, the water barrier formed by multiple Easy Dams may be damaged.

To prevent this phenomenon, a method may be prepared in which the user supplies water to the Easy Dam on site and stacks or arranges them in a designated location after the expansion is completed. In other words, it may involve field work of so-called sandbags stacked one on top of the other. This solution requires real-time work on site where the user supplies water to each Easy Dam one by one and stacks the Easy Dam at a designated location once the Easy Dam expansion is complete. It is obvious that it would be advantageous if additional measures were put in place to ensure that Easy Dam adheres to its designated position during real-time work on site by workers.

In normal times, a plan can be made to stack and arrange easy dams, which have a plate shape because they do not drink water, at designated locations. In this case, when it rains or external water targeted by the barrier comes in, the Easy Dam can absorb the water that comes in at the designated location, expand, and form a barrier on its own without the user's on-site help.

In this way, in the process of creating an environment in which the Easy Dam voluntarily expands at a designated location, the problem of the Easy Dam moving out of its designated position due to a phenomenon in which some parts expand first can seriously impede the formation of a water barrier.

The wings 130 may be used to encourage the Easy Dam to stick to a designated position during real-time work on site or to prevent problems with the Easy Dam deviating from the designated position in an environment where the Easy Dam voluntarily expands from the designated position.

The wing portion 130 may be formed in a plate shape at an end of the expansion portion 110.

The wing portion 130 covers the expansion portion 110 from below or above as shown in FIG. 1 when the expansion portion 110 is stored, and is spread out from the expansion portion 110 as shown in FIG. 2 when the expansion portion 110 is used. It may include a flexible material that bends.

The wing portion 130 may include a first wing 131 and a second wing 132.

The first wing 131 may be formed at the first end of the expansion part 110.

The second wing 132 may be formed at the second end of the expansion part 110. For example, the expansion portion 110 may be formed in a rectangular shape in plan view. At this time, the first end may be one side of the long side of the rectangle, and the second end may be the other side of the long side of the rectangle.

Externally, the first wing 131 and the second wing 132 may be connected to the edge of the expansion part 110 with the expansion part 110 between them.

The expansion unit 110 having the first wing 131, the second wing 132, and the easy dam may be arranged in the following manner.

When the first expansion part 110 i1, the second expansion part 110 i2, and the third expansion part 110 i3 are arranged in order along the direction parallel to the ground, the first expansion part 110 i2 1 Wing 131 may be installed to lie underneath the first expansion part 110 i1.

The second wing 132 of the second expansion part 110 i2 may be installed to cover the third expansion part 110 i1 from above.

The second wing 132 of the first expansion part 110 i1 may be installed to cover the second expansion part 110 i2 from above.

The first wing 131 of the third expansion part 110 i3 may be installed to lie under the second expansion part 110 i2.

When the plurality of expansion parts 110 are installed in this way, the first expansion part 110 i1 is placed on the first wing 131 of the second expansion part 110 i2, and the first expansion part 110 ) i1 can pressurize the first wing 131 of the second expansion part 110 i2 with its own weight.

As a result, the second expansion part 110 i2 connected to the first wing 131 pressed by the first expansion part 110 I2 can maintain the designated position. This phenomenon occurs simultaneously for each of the plurality of expansion parts 110, and as a result, the wing parts 130 can be of great help in forming a solid water barrier.

Meanwhile, due to the expansion part 110 expanding or swelling according to the expansion of the expansion element, the connection point between the expansion part 110 and the wing part 130 may be higher than the bottom surface of the other neighboring expansion part 110. To provide an area that can be sufficiently pressurized to the other expansion part 110 while overcoming the height difference between the connection point of the expansion part 110 and the wing part 130 and the bottom surface of the other expansion part 110, The length of at least one of the wing 131 and the second wing 132 is preferably more than half the length of the expansion part 110 within the length range of the expansion part 110. According to this, regardless of the expansion of the expansion part 110, the first wing 131 or the second wing 132 is sufficiently pressurized by the other surrounding expansion part 110 or sufficiently covers the other expansion part 110. You can. The second wing 132 covering the other expansion part 110 may be pressed by another expansion part 110 stacked on the other expansion part 110.

In the case of FIG. 4, it is sufficient to install the expansion part 110 (i3 in FIG. 4) in order, which is not placed on the first wing 131 of the other expansion part 110. In the case of Figure 4, the installation order may be i3, i2, i1, i6, i5, and i4.

Figure 5 is a schematic diagram showing an easy dam with four wings.

The expansion portion 110 may be formed in a polygonal shape, for example, a square shape, with a left side c, a right side d, an upper side a, and a lower side b on a plane.

At this time, a first wing 131 formed on the left side a, a second wing 132 formed on the right side b, a third wing 133 formed on the upper side c, and a fourth wing 134 formed on the lower side d may be provided. .

The third wing 133 formed on the upper side c or the fourth wing 134 formed on the lower side d is an easy dam when a plurality of expansion parts 110 are arranged along the width direction rather than the longitudinal direction of the expansion part 110. It can be used to adhere to a designated location.

Figure 6 is a schematic diagram showing the connection portion between the expansion part 110 and the wing part 130. Figure 7 is a cross-sectional view showing the connection portion between the expansion part 110 and the wing part 130.

The wing portion 130 may be connected to the expansion portion 110 by sewing between the end e2 of the wing portion 130 and the end e1 of the expansion portion 110.

One surface of the expansion part 110 facing the ground may be defined as the first surface m1. One end of the first side m1 may be defined as the first side end. The end of one end of the wing portion 130 may be defined as the end of the wing.

A state in which the wing portions 130 are overlapped on the first side m1 so that the wing ends are aligned with the ends of the first side may be defined as an overlapped state.

In the stacked state, the ends of the first side and the ends of the wings may be sewn to be connected to each other.

A seam allowance 150 protruding outward from the expansion portion 110 may be formed by sewing the first surface end and the wing end to be connected to each other in a stacked state. At this time, the seam allowance 150 may refer to the area from the seam line 119 to the end of the sewing object. In order to firmly combine the expansion portion 110 and the wing portion 130 and maintain the free space 117 within the expansion portion 110 where the expansion material is stored, a plurality of sewing and stitching are performed on the seam allowance 150. You can. The sewing process is performed on many areas within the seam allowance 150, and the area where the sewing process is performed may be defined as sewing area k. At this time, the sewing area k may include a sewing line 119.

Due to the sewing of the first side ends and the wing ends connected to each other in a stacked state, the seam portion 150 is formed on the ground when the wing portion 130 is spread outward from the first side m1 as shown in FIG. It can be formed on the side opposite to . According to this embodiment, the phenomenon of the seam allowance 150 being swept on the ground and the sewing state being released while the wings 130 are unfolded and used can be fundamentally prevented.

In addition, the seam seam formed by sewing the first side end and the wing end to be connected to each other in the stacked state is used to store the wing portion 130 on the expansion portion 110 by stacking the wing portion 130 on the expansion portion 110. Since it is in a parallel state to 130, it can be prevented that the wing portion 130, etc. is seriously bent with respect to the seam allowance during the storage process. Through this, it is possible to provide an attractive packaging condition and at the same time prevent damage due to bending.

In order to improve the convenience of the manufacturing process, the wing portion 130 may include the same material and the same thickness as the expansion portion 110.

At this time, the expansion part 110 may be formed by folding a single plate of the same thickness and the same material as the wing part 130. According to this, in terms of thickness, the expansion portion 110 has twice the size of the wing portion 130, and as a result, the seam portion 150 is usually located at the center of the expansion portion 110, as shown in FIG. 7. can be maintained in a parallel state.

Figure 8 is a schematic diagram showing the edge of the expansion part 110.

The two sides where sewing is performed may meet at the vertex of the expanded portion 110. In Figure 8, the vertex h where the upper side a and the left side c meet is shown. In this case, a problem may arise in selecting which side to sew first during the sewing process.

In reality, it may be difficult to perform sewing on only one side of vertex h. As a result, sewing performed on each side can be applied to the vertices where a plurality of sides meet. Accordingly, a plurality of sewing may be performed at the vertex h. Multiple sewing performed on vertex h may be advantageous in that it strengthens the sewing state of vertex h, which is a weak part during the sewing process. However, which side it is advantageous to sew first will be described later.

Figure 9 is a process diagram showing the manufacturing method of the easy dam of the present invention.

The expansion portion 110 may be formed by folding a plate-shaped plate portion.

The plate portion may be divided into a first plate 111 on one side and a second plate 112 on the other side based on a fold line crossing the center.

When the plate portion is folded based on the fold line, the first plate 111 and the second plate 112 face each other, and an expansion material is placed between the first plate 111 and the second plate 112. An accommodating spare space 117 may be formed.

The expansion portion 110 may be created by sewing the edges of the first plate 111 and the edges of the second plate 112 with the expansion material inserted into the spare space 117. The free space 117 is closed from the outside by sewing the edges of the first plate 111 and the edge of the second plate 112, and the expansion material contained in the free space 117 cannot be discharged to the outside.

The expansion portion 110 formed by folding the plate portion based on the fold line may be formed in a polygonal shape with a left side c, a right side d, an upper side a, and a lower side b on a plane.

When the fold line corresponds to the lower side b, sewing for the lower side b can be excluded.

Therefore, it is sufficient if sewing is performed on the upper side a, left side c, and right side d. In this case, the seam line 119 may include a first sewing line k1 formed on the upper side a, a second sewing line k2 formed on the right side d, and a third sewing line k3 formed on the left side c.

First, a first sewing process may be performed to connect the upper edges of the first plate 111 and the second plate 112 with the upper side a as the target. A first sewing line k1 connecting the upper edge of the first plate 111 and the upper edge of the second plate 112 may be formed through the first sewing.

After performing the first sewing, a second sewing may be performed to connect the side edges of the first plate 111 and the second plate 112, targeting at least one of the left side c and the right side d. A second sewing line k2 or a third sewing line k3 connecting the side edge of the first plate 111 and the side edge of the second plate 112 may be formed through the second sewing. In this case, the sewing order for the left side c and the right side d can be done regardless of which side is performed first.

During the second sewing, sewing between the wing portion 130 and the expansion portion 110, which are provided separately from the expansion portion 110, may be performed together.

In the case of Figure 9, the second sewing targeting the right side d and the first wing 131 is performed first. At this time, the first wing 131 may be second sewn (sewing performed along the second sewing line k2) while being overlapped with the expansion portion 110 so as to cover the bottom of the expansion portion 110. Thereafter, the first wing 131 may be spread outward from the bottom of the expansion portion 110 so as not to interfere with the second sewing targeting the left side c and the second wing 132.

With the first wing 131 unfolded, the second wing 132 is overlapped with the expansion part 110 to cover the bottom of the expansion part 110, and the second sewing (performed along the third sewing line k3) sewing) can be done. Afterwards, when the second wing 132 is covered with the outwardly unfolded first wing 131, the plate-shaped Easy Dam is formed by stacking the first wing 131, the second wing 132, and the expansion part 110 in that order. manufacturing can be completed. The Easy Dam can be sold in plastic bags.

In Figure 9, sewing of the expansion portion 110 is performed in the order of the first wing 131 and the second wing 132. Conversely, sewing is performed in the order of the second wing 132 and the first wing 131. Sewing on the expansion portion may be performed. In the latter case, the manufacture of a plate-shaped easy dam in which the second wing 132, the first wing 131, and the expansion part 110 are stacked in that order can be completed as shown in FIG. 1.

Figure 10 is a schematic diagram showing one side of the wing portion 130.

A fixing ring 10 fixed to the ground may be formed on the edge of one side of the wing portion 130 facing the ground or the edge of the first side m1 of the expansion portion 110. High water pressure may be applied to some of the rings fixed to the ground during the irrigation process. Therefore, the fixing ring 10 on which water pressure is concentrated may be torn. During this process, if part of the expansion part 110 is torn apart, a serious situation may occur in which the expansion material inside is discharged to the outside. Therefore, if the hardness of the material of the expansion part 110 does not satisfy the set value, it may be advantageous for the fixing ring 10 to be formed in the wing part 130. In this case, even if part of the wing portion 130 is torn due to water pressure, the water blocking performance may not be significantly affected.

Figure 11 is a schematic diagram showing the other side of the wing portion 130.

Velcro 30 may be formed in the center of the opposite side of one side of the wing portion 130 facing the ground or in the center of the second side m2 of the expansion portion 110.

Velcro 30 can help maintain a designated position when the plurality of expansion parts 110 are arranged left and right or stacked up and down. In order to stick to the designated position, the larger the area of the Velcro 30, the better. However, if the Velcro 30 is formed on the expansion part 110 and its area becomes too large, the area of the expansion part 110 through which water can be absorbed may be reduced. If the Velcro 30 is formed on the wing portion 130, there is no problem even if the size of the Velcro 30 is expanded as much as possible.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. It falls within the scope of invention rights.

10...Fixing hook 30...Velcro
110...expansion 111...first plate
112...2nd edition 117...free space
119...seam 130...wing section
131...1st wing 132...2nd wing
133...3rd wing 134...4th wing
150...seam allowance

Claims (10)

An expansion portion containing an expansion material that expands while absorbing water;
It includes a wing portion formed in a plate shape at an end of the expansion portion,
The wing portion is connected to the expansion portion by sewing between the end of the wing portion and the end of the expansion portion,
One side of the expansion portion facing the ground is defined as the first side,
One end of the first side is defined as the first side end,
One end of the wing portion is defined as the wing end,
When the state in which the wings are overlapped on the first surface such that the wing ends are aligned with the ends of the first surface is defined as an overlapped state,
In the stacked state, the ends of the first side and the ends of the wings are sewn to be connected to each other,
A seam allowance protruding outward from the expansion portion is formed due to sewing of the first surface end and the wing end to be connected to each other in the stacked state,
The seam portion is formed on the side opposite to the ground when the wing portion is spread outward from the first side,
The wing portion is overlapped with the expansion portion in a manner that covers the expansion portion from below or from above when the expansion portion is stored,
Due to the sewing between the end of the first side and the end of the wing performed in the overlapped state, when the expansion part is stored, the seam allowance is in a state parallel to the expansion part and the wing part in a state in which bending is prevented. .
According to paragraph 1,
The wing portion covers the expansion portion when the expansion portion is stored, and includes a flexible material that is bent to unfold from the expansion portion when the expansion portion is used.
According to paragraph 1,
A first wing formed at a first end of the expansion part and a second wing formed at a second end of the expansion part are provided,
When the first expansion part, the second expansion part, and the third expansion part are arranged in order along the direction parallel to the ground,
The first wing of the second expansion part is installed to lie under the first expansion part,
The second wing of the second expansion part is installed to cover the third expansion part.
According to paragraph 3,
The length of at least one of the first wing and the second wing is more than half the length of the expansion part within the length range of the expansion part.
According to paragraph 1,
The expansion portion is formed in a polygonal shape having a left side, a right side, an upper side, and a lower side on a plane,
An easy dam provided with a first wing formed on the left side, a second wing formed on the right side, a third wing formed on the upper side, and a fourth wing formed on the lower side.
delete delete An expansion portion containing an expansion material that expands while absorbing water;
It includes a wing portion formed in a plate shape at an end of the expansion portion,
The expansion portion is formed by folding a plate-shaped plate portion,
The plate portion is divided into a first plate on one side and a second plate on the other side based on a fold line crossing the center,
When the plate portion is folded based on the fold line, the first plate and the second plate face each other, and a free space for accommodating the inflatable material is formed between the first plate and the second plate. is formed,
The expansion portion is created by sewing the edges of the first plate and the edge of the second plate with the expansion material inserted into the free space,
The expansion portion formed by folding the plate portion based on the fold line is formed in a polygonal shape having a left side, a right side, an upper side, and a lower side in a plane,
When the fold line corresponds to the lower side, a first sewing is performed to connect the upper edges of the first plate and the second plate, targeting the upper side,
After performing the first sewing, a second sewing is performed to connect the side edges of the first plate and the second plate targeting at least one of the left side and the right side,
The second sewing is performed in a state where the wing portion, which is provided separately from the expansion portion, is overlapped with the expansion portion so as to cover the bottom of the expansion portion,
When the second sewing connects the side edges of the first plate and the second plate, sewing between the wing portion and the expansion portion overlapped with the expansion portion is performed together through the second sewing.
According to clause 8,
The wing portion includes a first wing connected to a first end of the expansion portion and a second wing connected to a second end of the expansion portion,
A second sewing targeting the right side and the first wing is performed first,
The first wing is second sewn while being overlapped with the expansion portion to cover the bottom of the expansion portion,
The second sewn first wing extends outward from the bottom of the expansion portion,
With the first wing unfolded, a second sewing is performed targeting the left side and the second wing,
The second wing is second sewn while being overlapped with the expansion portion to cover the bottom of the expansion portion,
An easy dam in which the second wing is covered with the first wing spread outward so that the first wing, the second wing, and the expansion part are formed in a plate shape in which the first wing, the second wing, and the expansion part are sequentially stacked.
According to paragraph 1,
Velcro is formed in the center of the opposite side of one side of the wing facing the ground,
An easy dam in which a fixing ring that is fixed to the ground is formed on one edge of the wing portion facing the ground.

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