Extended foundation pile

Abstract

The extended pile of the present invention is characterized by including: a filling portion filled in a ground to provide a supporting force against a load of a structure for preventing settlement of the ground; and an extended wing portion drawn to an outside of the filling portion in a state where the filling portion is filled in the ground after being inserted into an inner space of the filling portion to generate a pull-out resistance against the structure, the extended wing portion being spread in a radial shape by a pressure applied by a pile driver after a branch-shaped penetration head of the pile driver is inserted into the inner space and penetrated into the ground.

Description

Technical Field

[0001] This invention relates to extended foundation piles, and specifically to extended foundation piles that provide stable support by generating pull-out resistance, even under specific foundation conditions such as fragile foundations or desert areas. Background Technology

[0002] Foundation piles are inserted into the ground to stably transfer the loads of various structures to the supporting layer, and are a core element affecting the safety and durability of structures.

[0003] Based on the installation method, materials, and load transfer method, foundation piles are classified into several types.

[0004] For example, depending on the installation method, the foundation piles include driven piles (published in Patent Publication No. 10-2016-0110055) which are installed by directly driving or pressing piles into the foundation, bored piles which are installed by drilling holes in the foundation and filling them with concrete or other materials, and cast-in-place piles which are installed by directly fabricating piles on site.

[0005] Furthermore, depending on the load transfer method, foundation piles can be classified into end-bearing piles, which transfer the load by reaching a solid support layer at the end of the pile; friction piles, which support the load by the friction between the side of the pile and the foundation; and combined piles, which combine the characteristics of end-bearing piles and friction piles.

[0006] As mentioned above, while existing foundation piles can provide effective load support in ordinary foundations, they cannot provide sufficient pull-out resistance in fragile foundations or sandy foundations, thus making it difficult to ensure stable support.

[0007] To address the problems of existing foundation piles as described above, expanded piles have been developed that utilize the method of extending the ends of the piles to increase the support area. However, these expanded piles also have limitations in providing sufficient pull-out resistance to the structure. Summary of the Invention

[0008] The problem to be solved

[0009] The purpose of this invention is to provide an extended foundation pile that, by providing sufficient pull-out resistance to the structure, prevents deformation, damage, tilting, or pull-out of the structure in advance, even in areas with weak foundations or easily deformable ground, thereby ensuring the stability of the structure.

[0010] Problem-solving methods

[0011] The extended pile of the present invention is characterized by comprising: a backfill portion, embedded in the foundation, providing support for the load of the structure and preventing settlement of the foundation; and an extended wing portion, which, after being inserted into the internal space of the backfill portion, extends outward from the backfill portion while the backfill portion is embedded in the foundation to generate pull-out resistance against the structure. After a branch-shaped penetration head mounted on a pile driver is inserted into the internal space, the extended wing portion expands radially by means of pressure applied by the pile driver and penetrates into the foundation.

[0012] The extended pile of the present invention is characterized in that the extended wing changes direction by means of the pressure caused by the branched permeable head and extends outward of the backfill portion, thereby permeating into the foundation.

[0013] The buried portion of the extended foundation pile of the present invention is characterized by comprising: a body portion having a first internal space for allowing the extended wing portion to fall freely; a posture guide portion having a second internal space for guiding the posture of the extended wing portion passing through the first internal space; and an exit guide portion having a third internal space for causing the extended wing portion passing through the second internal space to bend and exit at a predetermined angle relative to the body portion.

[0014] The extended foundation pile of the present invention is characterized in that the first internal space, based on the volume of the extended wing, has extra space, making it easy to insert the branch-shaped permeable head.

[0015] The extended foundation pile of the present invention is characterized in that the first internal space, the second internal space and the third internal space are arranged separately along the circumferential direction, such that multiple radial dividing walls corresponding to each other and used to define the first internal space enhance the rigidity of the backfill portion.

[0016] The extended foundation pile of the present invention is characterized in that the second internal space allows the extended wing to move vertically in a manner preventing rotation, and the lead-out guiding portion includes: a bending guide portion, which causes the extended wing, entering from the vertical direction, to bend outward and penetrate into the foundation as it passes through the third internal space; and a sharp portion, which facilitates burying into the foundation when the burial portion is being filled. The extended foundation pile of the present invention is characterized in that at least two of the body portion, the posture guiding portion, the bending guide portion, and the sharp portion are configured as a single structure or integrated by welding after being joined by threaded fastening.

[0017] The extended foundation pile of the present invention is characterized in that the second internal space has: a second-first internal space, such that the extended wing moves along the vertical direction in a manner that maintains its posture; and a second-second internal space, wherein, as the extended wing descends due to the pressure after passing through the first internal space, the arcuate surface contacted by the front end of the extended wing induces the entry posture and entry direction of the front end, such that the extended wing enters the second-first internal space.

[0018] The extended foundation pile of the present invention is characterized in that the pointed portion is a conical shape that is wider at the top and narrower at the bottom, and has a groove on the outer surface, the groove increasing the permeability for filling the foundation.

[0019] The extended foundation pile of the present invention is characterized in that the groove is a groove extending in at least one vertical direction along the central axis of the conical shape.

[0020] The extended pile of the present invention is characterized in that the extended wings form a height difference to increase the rigidity for penetration into the foundation and, after penetration into the foundation, increase the pull-out resistance against the structure. The extended pile of the present invention is further characterized in that, if the extended wings complete penetration into the foundation by means of pressure generated by the branched penetration head, the internal space leads out the branched penetration head and remains empty.

[0021] The extended foundation pile of the present invention is characterized in that the internal space is filled with filler to increase the load and thus increase the pull-out resistance.

[0022] The extended foundation pile of the present invention is characterized in that the extended wing is formed in an arc shape to improve the rigidity for penetration into the foundation and to increase the pull-out resistance against the structure after penetration into the foundation.

[0023] The extended foundation pile of the present invention is characterized in that the extended wings are spread out radially such that the vertex is located on the lower side.

[0024] Invention Effects

[0025] The extended foundation piles of the present invention provide sufficient pull-out resistance even in areas with weak or easily deformable foundations, such as fragile foundations or desert areas, preventing deformation, damage, tilting or pull-out of the structure in advance, thereby ensuring the safety of the structure.

[0026] Furthermore, the ease of construction can be maximized by using a simple method to perform the process of providing pull-out resistance. Attached Figure Description

[0027] Figure 1A simplified perspective view is provided to illustrate the state in which the extended foundation pile of the present invention is embedded in the foundation by a branched permeable head installed on a pile driver.

[0028] Figure 2 This is an exploded perspective view illustrating the extended foundation pile and the branched permeation head installed on the pile driver of the present invention.

[0029] Figures 3 to 7 This is a diagram illustrating the construction sequence of the extended foundation pile of the present invention.

[0030] Figure 8 and Figure 9 An exploded perspective view illustrating a modified example of the extended foundation pile of the present invention, and a simplified perspective view showing the state of completion of the filling into the foundation.

[0031] (Explanation of reference numerals in the attached diagram)

[0032] 100, 300: Extended foundation piles

[0033] 110, 310: Landfill Section

[0034] 112, 312: Body part

[0035] 114, 314: Posture Guidance Department

[0036] 115, 315: Bending guide section

[0037] 116, 316: Lead-out induction section

[0038] 117, 317: Sharp point

[0039] 120, 320: Extended wings

[0040] 200: Branched penetration head

[0041] S: Interior space

[0042] S1: First Internal Space

[0043] S2: Second Internal Space

[0044] S2-1: Second-first internal space

[0045] S2-2: Second-Second Internal Space

[0046] S3: Third Interior Space

[0047] SF: Arc surface

[0048] G: Foundation

[0049] GV: Groove Detailed Implementation

[0050] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the concept of the present invention is not limited to the embodiments shown. Those skilled in the art who understand the concept of the present invention can easily propose other inventions or other embodiments included in the concept of the present invention by adding, modifying, or deleting other structural elements within the same scope of the concept, and these also fall within the scope of the concept of this application.

[0051] Furthermore, the same reference numerals are used to describe the structural elements with the same concept and function shown in the accompanying drawings of each embodiment.

[0052] Figure 1 A simplified perspective view is provided to illustrate the state in which the extended foundation pile of the present invention is embedded in the foundation by a branched permeable head installed on a pile driver.

[0053] Reference Figure 1 The extended foundation pile 100 of the present invention (hereinafter referred to as "foundation pile") can provide sufficient pull-out resistance to the structure in areas where the foundation is weak or easily deformed (e.g., fragile foundation or desert), thereby ensuring the stability of the structure.

[0054] The foundation pile 100 may include a backfill section 110 and an extended wing section 120.

[0055] The landfill portion 110 can be buried in the foundation G to provide support for the load of the structure and to prevent the foundation G from settling. After being inserted into the internal space S of the landfill portion 110, the extended wing portion 120 can be extended to the outside of the landfill portion 110 to generate pull resistance against the structure when the landfill portion 110 is buried in the foundation G.

[0056] With the branch-shaped permeation head 200 installed on the pile driver (not shown) inserted into the internal space S, the extended wing 120 can be radially deployed by the pressure applied by the pile driver and permeate into the foundation G.

[0057] The branch-shaped permeation head 200, as a type of head that can be installed on a piling machine, can correspond to the characteristics of the landfill 110, namely, the shape of the internal space S.

[0058] In other words, the branched permeable head can be provided in various forms based on the number and shape of the internal spaces formed in the landfill. If the landfill in the foundation is specified, the branched permeable head that matches it can be installed on the piling machine.

[0059] If the extended wing 120 is drawn out by the pressure of the branched permeation head 200, the radially unfolded extended wing 120 provides pull-out resistance, thereby maximizing the safety of the structure constructed through the foundation pile 100.

[0060] In other words, even in conditions such as fragile foundations or deserts, the pull-out resistance provided by the extended wing 120 can prevent structures (e.g., inflatable tents, communication poles, or signs) from tilting or being pulled out by strong winds such as tornadoes.

[0061] Figure 2 This is an exploded perspective view illustrating the extended foundation pile and the branched permeation head installed on the pile driver of the present invention.

[0062] Reference Figure 2 The filling section 110 is a structure that fills the foundation G with the help of the impact resistance provided by the pile driver or the like, and may include a body section 112, a posture guide section 114 and an extraction guide section 116.

[0063] The main body 112 can be generally cylindrical, but is not limited to this, and can be changed to a polygonal shape, etc.

[0064] The main body 112 may have a first internal space S1 for allowing the extended wing 120 to fall freely, and a plurality of the first internal spaces S1 may be symmetrically arranged with respect to the center.

[0065] Multiple first internal spaces S1 can be set along the circumferential direction D1, and as shown in the figure, up to four can be set, but it is not limited to this.

[0066] In other words, the number of the first internal spaces S1 can vary depending on the magnitude of the pull-out resistance, which varies with the characteristics of the foundation G on which the foundation pile 100 of the present invention is constructed.

[0067] On the other hand, the radial partition walls 118 used to define the first internal space S1 can function as a rib, thereby strengthening the rigidity of the fill portion 110.

[0068] After the foundation pile 100 of the present invention is constructed, even if the first internal space S1 is left empty, the partition wall 118 is strengthened to ensure the support force for the structure.

[0069] The posture guiding part 114 may have a second internal space S2 for guiding the posture of the extended wing 120 passing through the first internal space S1, and the extraction guiding part 116 may have a third internal space S3 for causing the extended wing 120 passing through the second internal space S2 to bend and be drawn out at a predetermined angle with reference to the body part 112.

[0070] The posture guide 114 may be located at the lower end of the main body 112, and the lead-out guide 116 may be located at the lower end of the posture guide 114.

[0071] The second internal space S2 provided in the posture guide 114 allows the extended wing 120 to move along the vertical direction D2 in a manner that prevents rotation. The lead-out guide 116 may include a bending guide 115 and a sharp part 117.

[0072] The bending guide 115 causes the extended wing 120, which enters from the vertical direction D2, to bend outward and penetrate into the foundation G as it passes through the third internal space S3. When the filling part 110 is filled, the pointed part 117 can be in the shape of a cone that is wider at the top and narrower at the bottom to facilitate filling into the foundation G.

[0073] After being manufactured into a threaded state by means of casting or other methods, at least two of the body part 112, the posture guide part 114, the bending guide part 115 and the sharp part 117 can be connected to each other by means of thread fastening.

[0074] At least two of the main body 112, the posture guide 114, the bending guide 115, and the pointed part 117 can be integrated by welding after being joined together by the threaded fastening method. When performing threaded fastening, the rotation angle for achieving complete fastening can be specified as 80 to 100 degrees, taking into account the speed and efficiency of the fastening process, but is not limited to this.

[0075] Furthermore, at least two of the main body 112, the posture guide 114, the bending guide 115, and the pointed part 117 can be set as a single structure from the time of manufacture, and can then be combined with the remaining structures through various fastening methods such as threaded fastening.

[0076] On the other hand, the main body 112, the posture guide 114, the bending guide 115, the sharp part 117 and the extended wing 120 can be made of either metal or reinforced plastic.

[0077] That is, for structures requiring relatively high strength, metal materials can be used, while for structures requiring relatively low strength, reinforced plastic materials can be used.

[0078] On the other hand, the multiple first internal spaces S1, second internal spaces S2 and third internal spaces S3 can be arranged in a corresponding manner, for example, four can be arranged at 90-degree intervals along the circumferential direction D1.

[0079] The branch-shaped permeation head 200 installed on the piling machine can pressurize the extended wings 120, which are spaced apart along the circumferential direction D1, by means of the pressure transmitted by the piling machine after being inserted into the internal space S.

[0080] If the front end is inserted into the second internal space S2 to fix the posture, the extended wing 120 passes through the third internal space S3 and penetrates into the foundation G by means of the pressure caused by the branch-shaped permeation head 200 inserted into the first internal space S1.

[0081] The branch-shaped permeation head 200 can be configured to correspond to the shape of the first internal space S1, which has extra space based on the volume of the extended wing 120, thereby naturally pressurizing the extended wing 120 during insertion into the first internal space S1.

[0082] In other words, the first internal space S1 has extra space based on the volume of the extended wing 120, thereby making it easier to insert the branch-shaped permeation head 200.

[0083] The extended wing 120 can extend outward from the landfill portion 110 and penetrate into the foundation G to generate pull-out resistance, and a height difference can be formed to maximize the pull-out resistance.

[0084] The second internal space S2 can be formed to have a shape that is substantially the same as the horizontal cross-section of the extended wing 120, thereby fixing the posture of the extended wing 120 as described above.

[0085] The third interior space S3 can be formed in a shape substantially the same as the horizontal cross-section of the extended wing 120, and can be curved outwards.

[0086] The extended wing 120 inserted into the third internal space S3 changes direction by means of the pressure caused by the branch-shaped permeable head 200 inserted into the first internal space S1, and extends outward to the outside of the landfill 110.

[0087] Figures 3 to 7This is a diagram illustrating the construction sequence of the extended foundation pile of the present invention.

[0088] like Figure 3 As shown, the steps of filling a specific location on the foundation G include the introduction guide 116, the posture guide 114, and the body 112 of the filling section 110.

[0089] In order to carry out the landfill, a known piling machine can be used, and the landfill process can be made easier due to the sharp tip 117 formed at the pointed front end.

[0090] If the landfilling of the landfill section 110 is completed, then as follows Figure 4 As shown, the step of inserting the extended wing 120 into the internal space S is performed.

[0091] At this time, the extended wing 120 can be inserted into the second internal space S2 to fix the posture.

[0092] If the extended wing 120 is inserted into the second internal space S2 through the first internal space S1, then as Figure 5 As shown, the step of inserting the branch-shaped permeation head 200, which is installed on the pile driver, into the first internal space S1 is performed.

[0093] The branched permeation head 200 may include: branches 202, the same number as the first internal space S1, and forming a shape substantially the same as the first internal space S1; and a head 204, connecting the branches 202 and connecting to a piling machine.

[0094] On the other hand, the vertical interval based on the second internal space S2 can be the interval for ensuring that the extended wing 120 bends through the third internal space S3.

[0095] If only the third internal space S3 exists and the second internal space S2 does not exist, then even if the extended wing 120 passing through the first internal space S1 is subjected to pressure, it will be difficult to achieve the goal of leading out toward the foundation G.

[0096] like Figure 6 As shown, if the branched permeation head 200 is used to pressurize the extended wing 120, then as... Figure 7 As shown, the branched permeation head 200 separates from the first internal space S1.

[0097] In the internal space S, if the penetration of the extended wing 120 into the foundation G is accomplished by the pressure caused by the branch-shaped permeation head 200 installed on the pile driver, then the first internal space S1 leads out the branch-shaped permeation head 200 and retains it in an empty state.

[0098] However, the first internal space S1 can also be filled with fillers such as the material forming the foundation G, sand, gravel, concrete or mortar to increase the pull-out resistance in order to increase the load.

[0099] During passage through the third internal space S3, the extended wing 120 can be radially deployed and extended outwards towards the outside of the lead-out guide 116, thereby providing pull resistance.

[0100] During the passage through the third internal space S3, the extended wing 120 penetrates into the foundation G in a curved state, and the curved state of the extended wing 120 contributes to the pull-out resistance.

[0101] The extended wing 120 extends outward from the lead-out guide 116 and the angle at which it unfolds radially can vary depending on the rigidity of the extended wing 120 or the curvature of the third internal space S3, which can be varied based on the characteristics of the foundation G.

[0102] The extended wing 120 can form a height difference to increase the rigidity for penetration into the foundation G and increase the pull-out resistance to the structure after penetration into the foundation G.

[0103] If the extended wing does not have a height difference and is flat, then in the case of stones or other materials mixed in the foundation, the rigidity becomes relatively weak, which may cause it to bend or fail to penetrate into the foundation during the process.

[0104] Furthermore, even if the flat extended wing penetrates normally into the foundation through the third internal space in a curved state, the possibility of restoring verticality within the foundation can be increased even with a relatively small pull-out force. Therefore, it is difficult to ensure sufficient pull-out resistance to guarantee the stability of the structure.

[0105] However, the present invention can penetrate normally into the foundation because of the extended wing 120 having a specified area and forming a height difference, and after penetration, minimizes the possibility of restoring verticality by means of pull-out force, thereby ensuring maximum pull-out resistance.

[0106] Furthermore, the extended wing 120, having a specified width or area and forming a height difference, can ensure the area of ​​soil pressed into the foundation, and not only increase the resistance area but also increase the manual earth pressure, thereby ensuring the pull-out resistance used to guarantee the safety of the structure.

[0107] The extended wing 120 has been described above in terms of forming a height difference, but it is not limited to this; it may also form wrinkles or embossing, etc.

[0108] Figure 8 and Figure 9 An exploded perspective view illustrating a modified example of the extended foundation pile of the present invention, and a simplified perspective view showing the state of completion of the filling into the foundation.

[0109] The following is a detailed description of the modified examples, but they are not identical to those described in the reference examples. Figures 1 to 7 Compared to the extended foundation pile 100 described herein, the same structural effects are omitted.

[0110] Reference Figure 8 and Figure 9 The filling part 310 provided in the extended foundation pile 300 may include a body part 312, a posture guide part 314, and an extraction guide part 316.

[0111] The second internal space S2 formed in the posture guide 314 may have a second-first internal space S2-1 and a second-second internal space S2-2.

[0112] The second internal space S2-1 allows the extended wing 320 to move vertically in a manner that maintains its posture, and the vertical interval based on the second internal space S2-1 can be the interval that ensures the extended wing 320 bends through the third internal space S3.

[0113] The second internal space S2-2 can be the space defined by the arcuate surface SF that the front end of the extended wing 320 contacts during the process of descending through the first internal space S1 formed in the body part 312 due to the pressure caused by the branch-shaped permeation head 200 installed on the pile driver.

[0114] When the front ends of the extended wing 320 come into contact, the arc surface SF can induce the front end's entry posture and entry direction, so that the extended wing 320 enters the second-first internal space S2-1.

[0115] Specifically, during the process of the extended wing 320 passing through the first internal space S1, it is possible that it does not form a posture corresponding to the second internal space S2-1 or enters in a direction offset from the second internal space S2-1.

[0116] In this case, the front end can come into contact with the arc surface SF, and then it can naturally change its posture and direction of entry during the sliding process, thereby stably entering the second internal space S2-1.

[0117] On the other hand, the pointed portion 317 may be a conical shape that is wider at the top and narrower at the bottom, and has a groove GV on the outer surface, which increases the permeability for filling the foundation G.

[0118] The groove GV can be a groove extending in at least one vertical direction along the central axis of the conical shape.

[0119] As described above, the groove GV not only increases the permeability but also reduces the amount of raw materials, thereby improving economic efficiency.

[0120] To further improve the economy, at least one of the posture guide 314, the bending guide 315 and the sharp part 317 may have a space SP of a predetermined size inside as shown in the figure.

[0121] On the other hand, the extended wing 320 can be formed into an arc shape to increase the rigidity for penetration into the foundation G and increase the pull-out resistance to the structure after penetration into the foundation G.

[0122] If the extended wing 320 extends outward toward the outside of the bending guide 115 and penetrates into the foundation G, the extended wing 320 unfolds radially such that the vertex is located on the lower side, thereby maximizing the effect of the pull-out resistance.

[0123] While the structure and features of the present invention have been described above with reference to embodiments thereof, the present invention is not limited thereto. Various modifications or variations can be made within the spirit and scope of the present invention, which will be obvious to those skilled in the art. Therefore, such modifications or variations are included in the appended claims.

Claims

1. An extended foundation pile, characterized by, include: The landfill section, buried in the foundation, provides support for the load of the structure and is used to prevent settlement of the foundation; as well as The extended wing, after being inserted into the interior space of the landfill, extends outward from the landfill while it is buried in the foundation, to generate pull-out resistance against the structure. After the branched penetrating head installed on the pile driver is inserted into the internal space, the extended wings expand radially by the pressure applied by the pile driver and penetrate into the foundation.

2. The extended foundation pile according to claim 1, characterized in that, The extended wing changes direction by the pressure generated by the branched permeable head and extends outward from the landfill, thereby permeating into the foundation.

3. The extended foundation pile according to claim 1, characterized in that, The landfill includes: The main body has a first internal space for allowing the extended wings to fall freely. A posture guide, having a second internal space for guiding the posture of the extended wing through the first internal space; and The guide section has a third internal space for bending and leading out the extended wing section, which passes through the second internal space, at a predetermined angle relative to the main body section.

4. The extended foundation pile according to claim 3, characterized in that, The first internal space, based on the volume of the extended wing, has extra space, making it easy to insert the branch-shaped permeation head.

5. The extended foundation pile according to claim 3, characterized in that, The first internal space, the second internal space, and the third internal space are arranged separately along a circumferential direction, so that multiple spaces correspond to each other. The radial partition walls used to define the first internal space enhance the rigidity of the landfill.

6. The extended foundation pile according to claim 3, characterized in that, The second internal space allows the extended wing to move vertically in a manner that prevents rotation. The extraction induction unit includes: The curved guide section causes the extended wing, entering from the vertical direction, to bend outwards and penetrate into the foundation as it passes through the third interior space; and The pointed part facilitates burying into the foundation when the landfill is being filled.

7. The extended foundation pile according to claim 6, characterized in that, At least two of the body portion, the posture guide portion, the bending guide portion, and the pointed portion are configured as a single structure or are integrated by welding after being joined by threaded fastening.

8. The extended foundation pile according to claim 6, characterized in that, The second interior space has: A second internal space allows the extended wing to move along the vertical direction in a posture-maintaining manner; and The second internal space is defined by the arcuate surface contacted by the front end of the extended wing during the descent of the extended wing portion through the first internal space due to the pressure. The arc surface guides the entry posture and direction of the front end, causing the extended wing to enter the second-first interior space.

9. The extended foundation pile according to claim 6, characterized in that, The pointed portion is conical in shape, wider at the top and narrower at the bottom, and has a groove on its outer surface, which increases the permeability for filling the foundation.

10. The extended foundation pile according to claim 9, characterized in that, The groove is a slot extending in at least one vertical direction along the central axis of the conical shape.

11. The extended foundation pile according to claim 1, characterized in that, The extended wing creates a height difference to increase the rigidity for penetration into the foundation and, after penetration into the foundation, to increase the pull-out resistance to the structure.

12. The extended foundation pile according to claim 1, characterized in that, If the extended wing completes its penetration into the foundation by means of the pressure generated by the branched permeation head, then the internal space leads out the branched permeation head and remains empty.

13. The extended foundation pile according to claim 12, characterized in that, The internal space is filled with filler to increase the load and thus increase the pull-out resistance.

14. The extended foundation pile according to claim 1, characterized in that, The extended wing is formed in an arc shape to increase the rigidity for penetration into the foundation and to increase the pull-out resistance to the structure after penetration into the foundation.

15. The extended foundation pile according to claim 14, characterized in that, The extended wings unfold radially such that the apex is located on the lower side.

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