KR102006961B1 - Multifunctional fall-prevention net - Google Patents

Abstract

The present invention relates to a multi-functional falling object prevention net designed to block a falling object falling from a tower crane by being installed in the tower crane, comprising: a falling prevention net forming an opening corresponding to a shape of a column of the tower crane; and a support frame installed along an edge of the falling prevention net so as to maintain a shape of the falling prevention net.

Description

Multifunctional Falling Object Protection Net {MULTIFUNCTIONAL FALL-PREVENTION NET}

The present invention relates to a multi-functional falling object prevention network, and more particularly, to a multi-function falling object prevention network designed to block falling objects falling from the tower crane is installed on the tower crane.

The conventional fall prevention net is mainly used in building construction, for example, a building, an apartment, or a high-rise building such as a factory, and bricks or wood gravel fall off the upper floor of a building under construction, causing pedestrians and construction workers to be injured. To prevent wearing, it was installed on the outer wall of the building. In addition, in order to install the fall prevention nets all around the outer wall of such a large building, dozens or hundreds of fall prevention nets are closely connected to each other.

In the construction site of high-rise buildings, falling cranes were not installed on tower cranes, but in recent years, construction workers and pedestrians on the ground have fallen off bolts, nuts, other tools or heavy objects from the top of high tower cranes. In case of injury, there was a need to install a drop protection net in the tower crane.

However, at present, there are no tower crane drop protection nets installed on the pillars of the tower crane, and there are cases in which several drop barrier nets installed on the outer wall of the existing high-rise building are woven and installed around the pillars of the tower crane. It is difficult to install around the high tower crane column, and there is a costly problem because it is installed by weaving the existing drop prevention network.

Existing tower crane special fall prevention net has a disadvantage in that it is generally disposed to be disposed of because of its large size, when it is separated after installation due to its shape, it is not easy to store.

On the other hand, the background art described above is technical information acquired by the inventor for the derivation of the present invention or obtained in the derivation process of the present invention, and can not necessarily be a known technology disclosed to the general public before the application of the present invention .

Korea Patent Registration No. 10-0817326 Korean Utility Model Registration No. 20-0438874

One side of the present invention is provided in the tower crane provides a multi-functional fall prevention net designed to block falling objects falling from the tower crane.

In addition, it provides a multi-functional fall prevention screen designed to reduce the volume by folding the screen in multiple stages.

In addition, it provides an adhesive composition that can be applied with sufficient thickness and evenness, and which can reduce odor and bacterial development.

 The technical problem of the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Multifunctional falling object prevention net according to an embodiment of the present invention, the fall prevention net to form an opening corresponding to the shape of the pillar of the tower crane; And a support frame installed along an edge of the drop prevention net so as to maintain the shape of the drop prevention net.

"형태로 형성되는 제1 프레임; 내측 공간에 상기 낙하 방지망이 설치될 수 있도록 내측이 빈 "

" 형태로 형성되며, 상기 제1 프레임과 대향하고 설치되어 타워크레인의 기둥의 형태에 대응하는 개구부를 형성하는 제2 프레임; 상기 제1 프레임의 일측 대향면과 상기 제2 프레임의 일측 대향면이 회전 가능하도록 연결 설치하는 프레임 회전부; 및 상기 제1 프레임의 다른 일측과 상기 제2 프레임의 다른 일측을 체결시키는 체결부를 포함하며, 상기 제1 프레임은, 수평 방향으로 연장 형성되는 제1 지지부, 상기 제1 지지부의 일측으로부터 상기 제2 프레임 방향으로 연장 형성되는 제2 지지부 및 상기 제1 지지부의 다른 일측으로부터 상기 제2 프레임 방향으로 연장 형성되는 제3 지지부를 포함하며, 상기 제1 지지부, 상기 제2 지지부 및 상기 제2 지지부에 의하여 전체로서 "

" 형태를 형성하며, 상기 제3 지지부는, 상기 제1 지지부로부터 독립되어 형성되며, 내측 공간에 상기 낙하 방지망이 설치될 수 있도록 내측이 빈 "ㅁ" 형태의 프레임으로 형성되고, 상기 제1 지지부의 다른 일측의 전단면에 회동 가능하도록 연결 설치되며, 상기 제1 지지부는, 상기 제2 지지부로부터 독립되어 형성되며, 내측 공간에 상기 낙하 방지망이 설치될 수 있도록 내측이 빈 프레임으로 형성되고, 상기 제2 지지부와 45°각도의 경사면으로 회동 가능하도록 연결 설치되며, 상기 제1 프레임은, 전체 부피를 감소시켜 보관될 수 있도록 상기 제3 지지부가 상기 제1 지지부와 포개지도록 1차 폴딩된 후, 상기 제1 지지부가 상기 제2 지지부와 포개지도록 2차 폴딩되며, 상기 프레임 회전부는, 상기 제1 프레임의 일측 대향면과 상기 제2 프레임의 일측 대향면이 회전 가능하도록 연결 설치하는 회전부; 및 상기 제1 프레임 또는 상기 제2 프레임이 하측 방향으로 회동되어 다른 프레임의 하측으로 포개지도록 상기 회전부의 하부에 설치되는 회동부를 포함하며, 상기 제1 프레임은, 1차 폴딩 및 2차 폴딩 후, 상기 회동부에 의하여 상기 제1 프레임과 상기 제2 프레임이 서로 포개지도록 3차 폴딩되며, 상기 지지 프레임은, "ㄴ"형태로 형성되어 상부가 상기 제2 프레임의 다른 일측 하부에 설치되며, 상기 제1 프레임 방향으로 절곡된 전단으로 상기 제1 프레임의 다른 일측을 지지하는 지지 플레이트; 및 상기 지지 플레이트의 전단 상부에 설치되어 탄성력을 이용하여 상기 제1 프레임의 안착에 따른 충격을 흡수하는 충격 흡수부를 더 포함하는, 상기 충격 흡수부는, 상기 제1 프레임이 안착되는 받침 프레임; 상측에 안착된 상기 받침 프레임을 지지하는 네 개의 받침 플레이트; 상기 네 개의 받침 플레이트의 각각의 하부에 회동 가능하도록 연결 설치되는 제1 프레임 및 제2 프레임을 포함하는 네 쌍의 지지 프레임; 및 사각 기둥 형태로 형성되며, 상기 제1 프레임이 상측면에 회동 및 수평 방향 슬라이딩 이동이 가능하도록 연결 설치되고, 상기 제2 프레임이 일 측면에 회동 및 수직 방향 슬라이딩 이동이 가능하도록 연결 설치되는 지지 기둥을 포함하며, 상기 지지 기둥은, 사각 기둥 형태로 형성되는 기둥 바디; 상기 기둥 바디의 상부에 "+"형태로 함몰 형성되는 십자홈; 상기 십자홈의 형태에 대응하는 형상으로 형성되어 상기 십자홈에 삽입되며, 네 개의 가지의 말단 상부에 상기 제1 프레임의 하측이 회동 가능하도록 연결 설치되는 십자 탄성부; 상기 기둥 바디의 각 면에 상하 수직 방향으로 형성되는 네 개의 수직홈; 및 상기 수직홈의 형태에 대응하는 형상으로 형성되어 상기 수직홈에 각각 삽입되며, 상부 외측에 상기 제2 프레임의 하측이 회동 가능하도록 연결 설치되는 네 개의 수직 탄성부를 포함한다.In one embodiment, it further comprises a fixing rope for fixing the support frame to the tower crane, the support frame, the inner side is empty so that the drop prevention net can be installed in the inner space "

"First frame formed in the shape; the inner side is empty so that the fall prevention net can be installed in the inner space"

"Is formed in a shape, the second frame facing the first frame is formed to form an opening corresponding to the shape of the pillar of the tower crane; one facing surface of the first frame and one facing surface of the second frame A frame rotating part connected to and rotatably installed, and a fastening part for fastening the other side of the first frame and the other side of the second frame, wherein the first frame includes a first support part extending in a horizontal direction; And a second support portion extending from one side of the first support portion in the second frame direction and a third support portion extending from the other side of the first support portion in the second frame direction. 2 support and said second support as a whole "

Form a shape, and the third support part is formed independently of the first support part, and is formed as a frame having an empty “ㅁ” shape so that the drop preventing net can be installed in an inner space, and the first support part Is rotatably connected to the other end of the side of the first support, the first support, is formed independently from the second support, the inner side is formed of an empty frame so that the drop prevention net can be installed in the inner space, It is rotatably connected to the second support and the inclined surface of the 45 ° angle, the first frame, after the first support is folded so that the third support is folded with the first support so that the overall volume can be stored, The first support is second-folded so as to overlap with the second support, and the frame rotating part includes one opposing surface of the first frame and one opposing surface of the second frame. And a rotating part connected to and installed to be rotatable, and a rotating part installed below the rotating part so that the first frame or the second frame is rotated in a downward direction and is folded below the other frame. After the primary folding and the secondary folding, the first frame and the second frame are folded by the rotating unit so that the first frame and the second frame are superimposed on each other. A support plate installed at a lower side of the other side of the frame and supporting the other side of the first frame with a front end bent in the first frame direction, and installed at an upper end of the support plate to use the first frame by using an elastic force The shock absorbing portion further comprises a shock absorbing portion for absorbing the impact of the seat, the support frame on which the first frame is seated; Four support plates supporting the attached support frame, four support frames including a first frame and a second frame rotatably connected to respective lower portions of the four support plates, and formed in a rectangular pillar shape. The first frame is connected to the upper side to enable the pivoting and horizontal sliding movement, and the second frame includes a support pillar connected to the rotational and vertical sliding movement on one side, The support pillar may include a pillar body formed in a square pillar shape; Cruciform grooves are formed recessed in the upper portion of the pillar body in a "+"shape; A cross elastic portion formed in a shape corresponding to the shape of the cross groove and inserted into the cross groove and connected to the upper portion of the four branches so that the lower side of the first frame is rotatable; Four vertical grooves formed vertically on each side of the column body; And four vertical elastic parts formed in a shape corresponding to the shape of the vertical grooves, respectively inserted into the vertical grooves, and connected to the upper outer side so that the lower side of the second frame is rotatable.

According to one aspect of the present invention described above, it is possible to provide an effect that the structure is simple and easy to install on the tower crane.

In addition, by reducing the volume by folding the screen in a number of steps, it can also provide the effect of easy storage after separation.

In addition, it has the effect of providing an adhesive composition that is hygienic and excellent in adhesion when the barrier net is attached.

The effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within the scope apparent to those skilled in the art from the following description.

1 is a view showing a schematic configuration of a multi-functional falling object prevention net according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating another example of the support frame of FIG. 1.
FIG. 3 is a diagram illustrating a first frame of FIG. 2.
4 is a diagram illustrating a folding method of the first frame of FIG. 3.
5 is a view illustrating a connection relationship between a first support part and a second support part.
6 is a view for explaining a folding method of the first support of FIG. 5.
FIG. 7 is a view illustrating another example of the support frame of FIG. 1.
8 is a view showing still another example of the support frame of FIG.
9 is a view showing a shock absorbing part.
10 and 11 illustrate the support pillar of FIG. 9.
FIG. 12 is a view showing the cross elastic part of FIG. 10.
FIG. 13 is a view illustrating the vertical elastic part of FIG. 11.

DETAILED DESCRIPTION OF THE INVENTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a view showing a schematic configuration of a multi-functional falling object prevention net according to an embodiment of the present invention.

Referring to FIG. 1, the multifunctional fall prevention net 10 according to an embodiment of the present invention includes a drop prevention net 100, a support frame 200, and a fixing rope 300.

The fall prevention net 100 forms the opening part 1 corresponding to the shape of the pillar of a tower crane, and the support frame 200 is installed along the edge, and the shape is maintained.

The support frame 200 is installed along the edge of the drop prevention net 100 so as to maintain the shape of the drop prevention net 100, and is installed on the tower crane by the fixing rope 300.

The fixing rope 300 fixes the support frame 200 to the tower crane.

The multifunctional falling object prevention net 10 having the configuration as described above can be easily installed on the tower crane because the structure is simple.

FIG. 2 is a diagram illustrating another example of the support frame of FIG. 1.

2, the support frame 200a includes a first frame 210, a second frame 220, a frame rotating part 230, and a fastening part 240.

"형태로 형성되며, 제2 프레임(220)와 대향하고 설치된다.The first frame 210 has an empty inner side so that the drop preventing net 100 can be installed in the inner space.

It is formed in the form, and is opposed to the second frame 220 is installed.

" 형태로 형성되며, 제1 프레임(210)과 대향하고 설치되어 타워크레인의 기둥의 형태에 대응하는 개구부(1)를 형성한다.The second frame 220 has an empty inner side so that the drop preventing net 100 can be installed in the inner space.

It is formed in the form, facing the first frame 210 is installed to form an opening 1 corresponding to the shape of the pillar of the tower crane.

The frame rotating part 230 is connected to one side facing surface of the first frame 210 and one side facing surface of the second frame 220 so as to be rotatable, and as shown in FIG. 2, the first frame 210 or The second frame 220 is rotated.

The fastening part 240 is formed in a “F” shape to fasten the other side of the first frame 210 and the other side of the second frame 220.

The support frame 200a having the above-described configuration rotates one side of the first frame 210 or the second frame 220 with the frame rotating part 230 as a rotation axis so that the other side is opened to open the tower crane. Can be easily fastened to, or easily separated.

FIG. 3 is a diagram illustrating a first frame of FIG. 2.

" 형태를 형성한다.Referring to FIG. 3, the first frame 210 is defined as a whole by the first support 211, the second support 212, and the second support 212.

Form the shape.

" 형태를 형성한다.That is, the first frame 210 may include a first support portion 211 extending in a horizontal direction, a second support portion 212 extending in a direction from the side of the first support portion 211 to the second frame 220, and By the third support portion 213 extending in the direction of the second frame 220 from the other side of the first support portion 211 "

Form the shape.

In this case, the third support part 213 is formed independently of the first support part 211, and is formed as a frame having an empty “ㅁ” shape so as to allow the drop preventing net 100 to be installed in the inner space. It may be connected to the other end of the support portion 211 so as to be rotatable.

And, as shown in Figure 5, the first support portion 211 is formed independently from the second support portion 212, the inner side is formed of an empty frame so that the fall prevention net 100 can be installed in the inner space, The second support part 212 may be connected to be rotatable on an inclined surface at an angle of 45 °.

The first frame 210 having the configuration as described above, after the third support 213 is first folded so as to be superimposed with the first support 211 so as to be stored by reducing the overall volume, the first support ( 211 may be secondary folded to overlap with the second support 212.

Since the structure of the first frame 210 having the configuration as described above is equally applied to the first frame 210 in a symmetrical structure, description thereof will be omitted to avoid duplication of description.

As shown in FIG. 4, in the first frame 210 having the above-described configuration, the other side of the support frame 200 is opened and closed according to the rotation of the third support part 213 to be fastened or separated to the tower crane. Can be made easy.

In addition, the first frame 210 having the configuration as described above, as shown in FIG. 6, as the overall volume of the support frame 200 is reduced according to the primary folding and the secondary folding, as shown in FIG. It can be done easily.

FIG. 7 is a view illustrating another example of the support frame of FIG. 1.

Referring to FIG. 7, the support frame 200b according to another embodiment includes a first frame 210, a second frame 220, a frame rotating part 230a, and a fastening part 240. Here, the frame rotating part 230a includes a rotating part 231 and a rotating part 232.

The rotating unit 231 is connected to one side facing surface of the first frame 210 and one side facing surface of the second frame 220 so as to be rotatable.

As shown in (b) of FIG. 7, the rotating part 232 includes a lower part of the rotating part 231 such that the first frame 210 or the second frame 220 is rotated in a downward direction to overlap the lower side of another frame. Is installed on.

According to the support frame 200b according to another embodiment as described above, the first frame 210, as shown in Figure 6, after the primary folding and secondary folding, as shown in Figure 6 By tertiary folding such that the first frame 210 and the second frame 220 are superimposed on each other, the volume can be reduced so that the storage efficiency can be improved more than that shown in FIG. 6.

8 is a view showing still another example of the support frame of FIG.

Referring to FIG. 8, the support frame 200c according to still another embodiment may include a first frame 210, a second frame 220, a frame rotating part 230, a fastening part 240, and a support plate 250. ) And the shock absorbing part 500. Here, the first frame 210, the second frame 220, the frame rotating part 230, and the fastening part 240 are the same as those of the component of FIG. 2, and description thereof will be omitted.

The support plate 250 is formed in a “b” shape, the upper part of which is installed at the lower side of the other side of the second frame 220, and the other side of the first frame 210 is sheared in the direction of the first frame 210. Support one side.

The shock absorbing part 500 is installed at the upper end of the support plate 250 to absorb the impact of the mounting of the first frame 210 by using the elastic force.

The support frame 200c having the above-described configuration further improves the durability of the equipment by absorbing the shock caused by the fastening between the first frame 210 and the second frame 220 by using the shock absorber 500. You can.

9 is a view showing a shock absorbing part.

Referring to FIG. 9, the shock absorber 500 includes a support frame 540, four support plates 510, four pairs of support frames 520, and a support column 530.

The supporting frame 540 is supported by the supporting plate 510 installed on the lower side, and the first frame 210 is seated on the upper surface.

The support plate 510 supports the support frame 540 that is seated on the upper side and is supported by the support columns 530 by the support frame 520 connected to the lower side.

In other words, the support plate 510 seats the support frame 540 on the upper side, and the support plate 540 supports the left and right direction (i.e., the first frame 521a) by the elastic force corresponding to vibration, Or the support frame 520 which is slidably moved in the vertical direction (i.e., the second frame 521b).

In addition, the present invention is formed by varying the length of the first frame (521a) or the second frame (521b), to overcome the limitations of the existing elastic body that can reduce the impact by simply adjusting the height in the vertical direction The support position by the plate 510 can be freely adjusted not only in the vertical direction but also in the left and right directions.

The support frame 520 is connected to two frames of the first frame 521a and the second frame 521b so as to be rotatable at the bottom of each of the four support plates 510 to support the plate 510 , The length of the first frame 521a or the second frame 521b is adjusted as described above to determine the support position of the support frame 540 by the plate 510. [

The upper portion of the first frame 521a and the upper portion of the second frame 521b are connected to the lower portion of the receiving plate 510 and the lower portion of the first frame 521a is rotated and rotated on the upper surface of the supporting column 530. [ And the lower portion of the second frame 521b is connected to one side of the support pillar 530 so as to be rotatable and vertically slidable.

That is, the first frame 521a or the second frame 521b can receive vibration or shock transmitted from the support plate 510 through the rotation or sliding movement by the elastic force on the upper side or one side of the support column 530 To support pillars 530.

The lower part of the second frame 521b is connected to the upper surface of the first frame 521a so as to be rotatable and horizontally slidable, And the elastic force (that is, the cross elastic portion 533 or the vertical elastic portion 535) when the first frame 521a or the second frame 521b is slidingly moved is provided so as to be rotatable and vertically slidable Thereby absorbing vibration or shock.

Each of the supporting plate 510 or the supporting frame 520 is driven by the same method as the symmetrical structure of each other, so that the contents of the supporting plate 510 or the supporting frame 520 as described above are described. The same may be applied to the other support plate 510 or the other support frame 520, the description thereof will be omitted.

In addition, the shock absorbing part 500 having the above-described configuration may be formed in a vertically symmetrical structure. In FIG. 9, the respective components are formed only on the upper portion of the support pillar 530. The configuration associated with the four support plates 510 and the four pairs of support frames 520 as described above may be equally applicable to the lower portion of the support pillar 530.

10 and 11 illustrate the support pillar of FIG. 9.

Referring to FIG. 10, the support pillar 530 includes a pillar body 531, a cross groove 532, a cross elastic portion 533, four vertical grooves 534 (see FIG. 11), and four vertical elastic portions. 535 (see FIG. 11).

The pillar body 531 is formed in the shape of a square pillar, a cross groove 532 is formed on the upper portion, the vertical groove 534 is formed on each side.

The cross groove 532 is formed in the upper portion of the column body 531 in a "+" shape, and the cross-elastic portion 533 is inserted into the inner space.

The cross elastic portion 533 is formed in a shape corresponding to the shape of the cross groove 532 and is inserted into the cross groove 532 so that the lower side of the first frame 521a can be rotated And the vibration or shock transmitted from the first frame 521a is absorbed by elastic force to attenuate vibrations or shocks.

The vertical grooves 534 are vertically formed on the respective surfaces of the column body 531, and the vertical elastic portions 535 are inserted into the inner spaces.

The vertical elastic part 535 is formed in a shape corresponding to the shape of the vertical groove 534 and is inserted into the vertical groove 534 and the lower part of the second frame 521b is rotatably connected to the outside of the upper part, To absorb vibration or shock transmitted from the second frame 521b to attenuate vibrations or shocks.

FIG. 12 is a view showing the cross elastic part of FIG. 10.

Referring to FIG. 12, the cross elastic part 533 includes a cross case part 5313, an upper support part 5332, four upper elastic parts 5333, four upper elastic support parts 5340, and four upper connecting links. A part 5335 is included.

The cross housing portion 5331 is formed in a hollow shape and is inserted into the cross groove 532 and has an upper support portion 5332, four upper elastic portions 5333, Upper elastic supporting portions 5334 are provided.

At this time, the length of each branch of the cross case portion 5311 is formed shorter than the length of each branch of the cross groove 532, as shown in Figure 12, the upper portion in the space formed on the outside of the cross case portion (5331) The connecting link portion 5335 may be disposed and may form a space for sliding movement.

The upper support portion 5332 is formed as a cube and is disposed at the center portion of the cross case portion 5331 and supports the upper elastic portion 5333 so that the upper elastic portion 5333 is disposed outside the four surfaces, do.

The upper elastic part 5333 is disposed on each side of the upper supporting part 5332 and supports the upper elastic supporting part 5334 by elastic force to absorb vibration or impact transmitted from the upper elastic supporting part 5334. [

The upper elastic supporting portions 5334 are respectively disposed at the ends of the respective branches of the inner space of the cross case portion 5331 and are supported by the elastic force of the upper elastic portion 5333 and are disposed between the upper connecting link portions 5335 And supports the upper connecting link portion 5335 by the supporting bar 5336.

The upper connecting link portions 5335 are disposed at the ends of the respective branches of the cross groove 532 and are provided with supporting bars 5336 provided between one side surface facing the cross case portion 5331 and the upper elastic supporting portion 5334 And the lower part of the first frame 521a is rotatably connected to the lower part of the upper frame 521. The lower end of the first frame 521a is connected to the upper end of the first frame 521a, And moves along the groove of the cross groove 532 in the center direction.

FIG. 13 is a view illustrating the vertical elastic part of FIG. 11.

Referring to FIG. 13, the vertical elastic part 535 includes a vertical case part 5331, a side support part 5332, a side elastic part 5435, a side elastic support part 5344, and a side connection link part 5345. do.

The vertical case portion 5331 is formed in a shape corresponding to the shape of the vertical groove 534 in which the inner space is empty, and the side support portion 5332, the side elastic portion 5431, and the side elastic support portion 5344 are formed from the lower side of the inner space. ) Are installed in order.

The side support portion 5342 is formed as a cube and disposed in the lower space of the vertical case portion 5341 and the side elastic portion 5343 is disposed on the upper side to support the side elastic portion 5343.

The side elastic part 5343 is disposed on the upper side of the side supporting part 5342 and supports the side elastic supporting part 5344 disposed on the upper side by an elastic force so that the vibration or shock transmitted from the side elastic supporting part 5344 Absorbed.

The side elastic support portion 5344 is disposed on the upper side of the inner space of the vertical case portion 5341 and is supported by the elastic force of the side elastic portion 5343 and is supported by the support bars 5346 Thereby supporting the side connecting link portion 5345.

The side connection link portion 5345 is disposed at the upper end of the vertical groove 534 and has a support bar 5346 installed between the lower side opposed to the vertical case portion 5341 and the upper side surface of the side elastic support portion 5344 And the second frame 521b is rotatably connected to the outer side of the second frame 521b so as to be slidable along the groove of the vertical groove 534 in the lower direction of the vertical groove 534 .

Multifunctional falling object prevention net 10 according to another embodiment of the present invention may further include a composition for repairing a building structure including an acrylic binder for filling and repairing where the crack is generated when a crack occurs in the structure.

Here, the structure, the support frame 200 may correspond to this, but is not limited thereto, and each of the components constituting the present invention may correspond thereto.

The inventors of the present invention have found that, in a composition for repairing a conventionally existing building structure, a composition exhibiting satisfactory effects among compositions having improved water resistance, water resistance and crack resistance is not present, and as a result, Water resistance, water resistance, and crack resistance, all of which have satisfactory effects.

In the present invention, the acrylic binder may be an acrylic ester copolymer. The acrylic ester copolymer may be an acrylic ester copolymer having a CAS number of 30445-28-4. The inventors of the present invention found that when the composition contains the acrylic ester copolymer, it is possible to achieve both the water resistance and the crack resistance, which are the problems to be solved by the present invention, while searching for various compounds that can be added to the composition for repairing a building structure Respectively.

In the present invention, the acrylic binder may include 10 to 50 parts by weight, preferably 15 to 40 parts by weight, and more preferably 20 to 30 parts by weight.

The composition of the present invention may further include, in particular, EVA binder, butyl cellosolve, rosin, texanol and propylene glycol in order to achieve waterproofness and water resistance among the problems to be solved by the present invention. .

In the present invention, the EVA binder is preferably ethylene vinyl acetate and the CAS number is 24937-78-8.

In the present invention, the butylcellosolve may be a compound having CAS No. 111-76-2.

In the present invention, the rosin refers to a natural resin obtained by distilling rosin. Any rosin that is commercially available rosin may be included as a solution for solving the problem of the present invention.

In the present invention, TEXANOL may be a compound having CAS No. 25265-77-4.

In the present invention, the propylene glycol may be a compound having CAS No. 57-55-6.

The inventors of the present invention have found that the effect of water resistance is particularly improved when EVA binder, butyl cellosolve, rosin, texanol and propylene glycol are further contained as a constitution of a composition for repairing a building structure including an acrylic binder .

Specifically, the composition comprises 0.01 to 10 parts by weight of an EVA binder, 0.01 to 5 parts by weight of butyl cellosolve, 0.01 to 5 parts by weight of rosin, 0.01 to 5 parts by weight of texanol, and 0.01 to 3 parts by weight of propylene glycol .

More specifically, the present inventors have found that when the composition further comprises 2-amino-2-methyl-1-propanol and 2-methylamino-2-methyl-1-propanol, the effect of water resistance is remarkably improved Respectively. That is, EVA binder, butyl cellosolve, rosin, texanol and propylene glycol, and 2-amino-2-methyl-1-propanol and 2-methylamino in the building repair composition containing the acrylic binder. When the 2-methyl-1-propanol is further included, the present invention has been completed through improved water resistance and water resistance.

In the present invention, the composition may contain the 2-amino-2-methyl-1-propanol and the 2-methylamino-2-methyl-1-propanol in a weight ratio of 15 to 20: 1, : 1, and more preferably in a weight ratio of 17 to 20: 1.

The 2-amino-2-methyl-1-propanol and 2-methylamino-2-methyl-1-propanol may be included in the composition in an amount of 0.1 to 5 parts by weight.

The inventors of the present invention have confirmed that the above composition can improve the water resistance in particular among the problems to be achieved by the present invention.

Also, the composition for repairing a building structure including the acrylic binder may further include ethylene glycol, butyl cellosolve, calcium carbonate, titanium dioxide, and water.

If the composition described above has excellent waterproofing and water resistance effects, the composition is characterized by improved crack resistance. The butyl cellosolve is as described above.

In the present invention, ethylene glycol refers to a compound having a CAS number of 107-21-1.

In the present invention, the calcium carbonate means a compound having a CAS number of 1317-65-3.

In the present invention, the titanium dioxide refers to a compound having a CAS number of 13463-67-7.

Specifically, the composition comprises 0.01 to 5 parts by weight of ethylene glycol, 0.01 to 5 parts by weight of butyl cellosolve, 20 to 50 parts by weight of calcium carbonate, 0.01 to 5 parts by weight of titanium dioxide, Weight part.

The present inventors have come to realize the idea in natural extracts while searching for a composition for improving crack resistance. The present inventors have found that the effect of crack resistance is remarkably improved when the composition further contains flaxseed mucus or flaxseed mucilage extract. That is, when ethylene glycol, butyl cellosolve, calcium carbonate, titanium dioxide and water, and flaxseed mucilage or flaxseed mucilage extract are additionally contained in the composition for building and repair containing the acrylic binder, The present invention has been completed through confirmation.

In the present invention, flax is an annual herbaceous herbaceous herbaceous plant of the dicotyledonous plant, and the seed is flat, long elliptical and yellowish brown.

In the present invention, the flaxseed mucilage can be produced by various methods, but for example, a mulberry slime can be prepared by scraping mucous from flaxseed with a scraper.

In the present invention, the flaxseed mucus extract may be prepared by way of example as follows.

1 g of flaxseed was put into 50 L of purified water and stirred at 25 ° C for 5 hours and then filtered through a 300-mesh filter cloth. The same amount of alcohol, preferably ethanol, was added to the filtrate to precipitate the wastewater, Only filter paper NO. 5, and dried to obtain a white powdery form.

Conventionally, various uses for flaxseed have been known. However, the effect of improving the crack resistance by incorporation into a composition for repairing a building structure as in the present invention has not been known to date, and research has been limited.

Specifically, the composition may contain 1 to 10 parts by weight of the flaxseed mucilage or the flaxseed mucilage extract.

The composition for repairing a building structure may further include at least one additive selected from a dispersant, an antifoaming agent, an antimicrobial agent, an antiseptic, and an antifreezing agent within a range that does not impair the basic physical properties of the composition for repairing a building structure.

The present invention also provides a method of manufacturing a building structure, comprising: S1) removing a deteriorated portion of a surface of a building structure; And S2) cracking and repairing of the structure may be performed by coating and drying the composition for repairing the building structure on the surface of the building structure from which the deteriorated portion has been removed to form a cracking repair film.

Hereinafter, the structure and effects of the present invention will be described in more detail with reference to specific examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

Material preparation

Information on the main raw materials used in the building structure repair composition for the following Examples and Evaluation Examples is as follows.

1) Acrylic binder: Acrylic ester copolymer CAS NO 30445-28-4

2) EVA binder: ethylene vinyl acetate CAS NO 24937-78-8

3) Butylcellosolve: CAS NO 111-76-2

4) TEXANOL: CAS NO 25265-77-4

5) Propylene glycol: CAS NO 57-55-6

6) Ethylene glycol: CAS NO 107-21-1

7) Calcium carbonate: CAS NO 1317-65-3

8) Titanium dioxide: CAS NO 13463-67-7

9) 2-Amino-2-methyl-1-propanol: CAS NO 124-68-5

10) 2-Methylamino-2-methyl-1-propanol: CAS NO 27646-80-6

11) flaxseed mucus

The scum was used to scrape the mucous from flaxseed to obtain flaxseed mucilage.

12) Flaxseed mucus extract

1 g of flaxseed was put into 50 L of purified water, stirred at 25 ° C for 5 hours, and then filtered through a 300-mesh filter cloth. The same amount of ethanol was added to the filtrate to precipitate. 5, and dried to obtain about 0.2 g of a white powder.

Example 1

5 parts by weight of EVA binder, 1 part by weight of butyl cellosolve, 0.5 part by weight of rosin, 0.5 part by weight of texanol, 0.1 part by weight of propylene glycol and other thickener After slowly adding a pH adjuster, etc. in order, 50 parts by weight of calcium carbonate was added thereto and stirred at room temperature for 1 hour at a speed of 300 rpm to prepare a composition for repairing building structures.

Example 2

30 parts by weight of an acrylic binder was placed in a mixing tank, and 5 parts by weight of EVA binder, 1 part by weight of butyl cellosolve, 0.5 part by weight of rosin, 0.5 parts by weight of texanol, 0.1 part by weight of propylene glycol, Amino-2-methyl-1-propanol, 0.06 part by weight of 2-methylamino-2-methyl-1-propanol and other thickening assistants and pH adjusting agents were gradually added in this order and 50 parts by weight of calcium carbonate And the mixture was stirred at room temperature for 1 hour at a rate of 300 rpm to prepare a composition for repairing a building structure.

Example 3

30 parts by weight of an acrylic binder was placed in a mixing tank and stirred at 600 rpm at a rate of 1 part by weight of ethylene glycol, 1 part by weight of butyl cellosolve, 0.5 part by weight of titanium dioxide, 5 parts by weight of water and other viscosity aids, And 50 parts by weight of calcium carbonate as a filler were added and stirred at a speed of 300 rpm for 1 hour at room temperature to prepare a composition for repairing a building structure.

Example 4

30 parts by weight of an acrylic binder was added to a mixing tank, and 1 part by weight of ethylene glycol, 1 part by weight of butyl cellosolve, 0.5 part by weight of titanium dioxide, 5 parts by weight of water, 5 parts by weight of flaxseed extract and flaxseed extract And other pH adjusters were added in order. Then, 50 parts by weight of calcium carbonate as a filler was added and stirred at a speed of 300 rpm for 1 hour at room temperature to prepare a composition for repairing a building structure.

Evaluation example 1

The deteriorated parts of the civil engineering structure were removed, and the repair compositions for the building structures of Examples 1 to 4 were painted and dried, respectively, to form a crack repair film. The adhesion strength, crack resistance and slip resistance of the crack repair film thus obtained and the storage stability of the crack repair agent composition were evaluated based on the test method of the KS standard and KSL 1593 and the results are shown in Table 1 below. In addition, in the case of water resistance, the degree of water absorption inside the crack repair film was evaluated by a five-point scale method. In Table 1, Product X represents a product for repairing a building structure of a building structure B, which is commercially available in Korea, and is evaluated as a comparative object to the composition of Examples 1 to 4.

[Table 1]

As shown in Table 1, it can be confirmed that the compositions for repairing building structures of Examples 1 to 4 have improved water resistance, water resistance and crack resistance compared with the product X, and that the storage stability and slip resistance are also satisfactory . Particularly, in Examples 1 and 2 of the present invention, it was confirmed that the waterproof property and the water resistance were evaluated more favorably, and in Examples 3 and 4, the crack resistance was further evaluated.

Adhesive composition according to an embodiment of the present invention, when a portion of the drop prevention net 100 is damaged as a protective net attachment adhesive composition for adhering to each other between the drop prevention net 100, 40 to 80 parts by weight of a thermoplastic resin, tackifier resin 5 40 parts by weight, 1 to 5 parts by weight of rosin, 1 to 10 parts by weight of plasticizer, 1 to 10 parts by weight of filler, and 0.1 to 1 parts by weight of antioxidant. The present invention is a hot melt adhesive composition, generally manufactured in a state of being bonded between the release agent and the silicone band, to remove the release agent when applied to the fabric to perform a role to make the anti-drop net 100 is attached to each other do. Hereinafter, each component will be described in detail.

The thermoplastic resin serves as a main component of the composition to control adhesion and cohesion. If the type includes a vinyl group or a hydroxyl group, the type is not particularly limited, and examples thereof include ethylene vinyl acetate copolymer, polyvinylacetate, polyvinyl alcohol, ethylene-acrylic acid copolymer and ethylene-methacrylic acid copolymer, and polyurethane. It may be composed of one or more selected from the group consisting of.

The content of the thermoplastic resin is preferably 40 to 80 parts by weight based on the total composition. If the content is less than 40 parts by weight, the melt viscosity is high and the melt flow index is low, the workability is very poor, if the content is more than 80 parts by weight it is difficult to exert sufficient adhesive force to be applied directly to the fabric.

The tackifier resin is a low molecular weight resin, lowers the melt viscosity to improve workability, improves the initial wettability of adhesion and adhesion of the adhesive on the surface of the adherend, and enables control of the solidification time.

The tackifying resin is not particularly limited in kind, but is preferably a petroleum resin. More specifically, the tackifier resin may be composed of one or more selected from the group consisting of aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, aromatic hydrocarbon resins, aromatic hydrocarbon-modified aliphatic hydrocarbon resins, and hydrogenated hydrocarbon resins.

The aliphatic hydrocarbon resins are commercial products such as Hikorez A-1100, Hikorez A-1100S, Hikorez C-1100, Hikorez R-1100, Hikorez R-1100S, and the like. In addition, alicyclic hydrocarbon resins include hydrocarbon resins containing dicyclopentadiene (DCPD) as monomers, and aromatic hydrocarbon resins are commercially available from Kolon Oil Co., Ltd. of Hikotack P-110S, Hikotack P-120, Hikotack P-120HS, Hikotack P-120S, Hikotack P-140, Hikotack P-140M, Hikotack P-150, Hikotack P-160, Hikotack P-90, Hikotack P-90S, Hirenol PL-1000, Hirenol PL-400. In addition, aromatic hydrocarbon-modified aliphatic hydrocarbon resins include Hikorez T-1080, Hikorez T-1100, etc. of Kolon Oils. Hydrogenated hydrocarbon resins can also be subdivided into hydrogenated aliphatic hydrocarbon resins, hydrogenated aromatic hydrocarbon resins, and the like, and commercially available from Kolon Oil Co., Ltd. Sukorez SU-120, Sukorez SU-130 and Sukorez SU-90.

The tackifier resin is preferably a hydrocarbon resin having 4 to 10 carbon atoms in the monomer, and specifically, a C5 aliphatic resin, a C9 aromatic resin, a C5 / C9 aliphatic / aromatic copolymer resin, or the like may be used.

In addition, the tackifying resin of the present invention is more preferably characterized in that the hydrocarbon hydrocarbon resin containing dicyclopentadiene as a monomer, commercially available from Sukorez D-300, Sukorez D-390, Kolon Emulsifier (Korea), Sukorez SU-100, Sukorez SU-110, Sukorez SU-120, SukorezSU-130 and Sukorez SU-90.

On the other hand, the adhesive composition of the present invention, in order to minimize the irritation as much as applied to the part directly in contact with the skin, it is preferable to use a mixture of biodegradable hypoallergenic resin in the various petroleum resin described above.

The biodegradable hypoallergenic resin may be prepared by melt-mixing a monomer of a polymer into a biodegradable polymer, and polylactic acid is preferably used as the biodegradable polymer.

The polylactic acid is a polyester synthesized by polycondensation of lactate or ring-opening polymerization of lactide, and has a medium physical property between polyamide and polyethylene terephthalate, and is mainly made of natural vegetable sugar components obtained from potatoes and corn. Biodegradability is high, but generally has high hardness, low elasticity, and poor durability.

The biodegradable polymer is melt-mixed with the same polymer monomer, wherein the biodegradable polymer is partially bonded with the monomer to cause chain breakage, thereby lowering the overall number average molecular weight. As the number average molecular weight falls, the physical properties that can be used as an adhesive are exhibited, and the workability is increased.

With respect to 100 parts by weight of the polylactic acid, the lactic acid monomer may be mixed 20 to 30 parts by weight. When the monomer is mixed in less than 20 parts by weight, the number average molecular weight is high and hard to be used as a pressure-sensitive adhesive, when the monomer exceeds 40 parts by weight migration may occur on the surface and may also be difficult to use as an adhesive.

It is preferable that the mixing ratio of the petroleum resin and the biodegradable hypoallergenic resin is 1 to 2: 1 (w / w). When the mixing ratio of the petroleum resin is too high, the biodegradable hypoallergenic effect is less likely to occur. If the mixing ratio is too high, economic efficiency may be lowered and the overall adhesive effect may be lowered.

In addition, the content of the tackifying resin is preferably 5 to 40 parts by weight relative to the total composition. If the content is less than 5 parts by weight, the effect of lowering the melt viscosity due to the addition of the tackifying resin is insufficient, and there is a fear that the increase in the melt flow index is not so large that the workability may not be satisfactorily reached, and the content is more than 30 parts by weight. If the melt flow index increase rate due to the excess of the tackifier resin is not large, the economical efficiency is lowered and the content of the thermoplastic polymer is relatively reduced, thereby reducing the overall physical properties of the composition.

The rosin acts to improve the overall adhesion of the adhesive composition and is harmless to the human body and acts as a natural preservative. The content of the rosin is preferably 1 to 5 parts by weight based on the total composition. If the content is less than 1 part by weight, it is difficult to obtain an effect of improving the adhesive strength, and if the content exceeds 5 parts by weight, there is a problem in that the adhesion is increased during processing, making it difficult to process the product.

The plasticizer is used to impart flexibility and adhesion to the polymer, and the type of plasticizer according to the present invention is not particularly limited, and for example, sorbitol, ethylene glycol, glycerin, glycerin diacetate, and pentaerythritol It may consist of one or more selected from the group consisting of.

The amount of the plasticizer is preferably 1 to 10 parts by weight based on the total composition. If the content is less than 1 part by weight, the effect of the addition of the plasticizer is insignificant. If the content is more than 10 parts by weight, the economical efficiency may be reduced by excessive use of the plasticizer, and there is a concern that the overall physical properties of the adhesive may be lowered.

The filler is used to control the reinforcement and flow of the composition. The type of filler is not particularly limited, and for example, calcium carbonate, clay, bentonite, calcium stearate or the like can be used.

On the other hand, the adhesive composition of the present invention is applied to the pressure lever 350 or the attachment surface of the cover, the odor and bacteria are likely to occur in the application environment. Therefore, in order to reduce the odor and bacteria generation while controlling the reinforcement and flow of the adhesive composition, it is preferable to use a mixture of stone powder and pulp powder as a filler. Stone powder can achieve high strength without using additives due to the compactness of the particles, and the cracking of the adhesive hardly occurs even when the temperature change is large due to low volumetric strain according to the surrounding environment.

The stone powder may be used in the form of powder of various rocks such as loess, marble, ganban stone, granite, jadeite, preferably characterized in that the loess has various functions such as antibacterial, anti-fungal, UV emission.

The pulp powder serves to agglomerate the stone powders while sucking the liquid components, to improve the miscibility and improve the cohesion between the components. At this time, the stone powder and the pulp powder is preferably mixed in a ratio of about 7: 3 to 8: 2 (w / w).

The content of the filler is preferably 1 to 10 parts by weight based on the total composition. If the content is less than 1 part by weight, the effect of adding the filler is insignificant, and if the content is more than 10 parts by weight, there is a concern that the overall physical properties of the adhesive may be lowered.

The antioxidant is intended to improve the change in viscosity, yellowing, deterioration of adhesion and degradation of durability due to oxidation and decomposition, and the type thereof is not particularly limited, and specifically, phenols, aromatic amines, citric acid, or ascorbic acid may be used. Can be.

The content of the antioxidant is preferably 0.1 to 1 parts by weight relative to the total composition. If the content is less than 0.1 part by weight, the effect of the addition of the antioxidant is insignificant, and if the content exceeds 1 part by weight, not only the economical efficiency of the adhesive is lowered but also the overall physical properties may be lowered.

On the other hand, the adhesive composition of the present invention may further include a nano-silica that can be improved evenly to the adhesive force to be uniformly distributed on the attachment surface of the drop prevention net (100). At this time, the content of the nano silica is preferably 0.1 to 5 parts by weight, and the size of the nano silica (primary particles) is preferably 100 nm or less.

If the content of the nano-silica is less than 0.1 parts by weight, the effect of the addition of nano-silica is insignificant, and if the content exceeds 5 parts by weight, not only the adhesive force is lowered but also a bad phenomenon that blooming (blooming) occurs on the surface of the adhesive over time May occur.

Hereinafter, the structure and effects of the present invention will be described in more detail with reference to specific examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

Example 1

60 parts by weight of ethylene-vinylacetate copolymer, 25 parts by weight of Sukorez D-300, 3 parts by weight of rosin, 5 parts by weight of ethylene glycol, 4 parts by weight of ocherite, 2 parts by weight of pulp powder and 1 part by weight of ascorbic acid. Melt kneading at ° C to prepare an adhesive composition and then molded into pellets. At this time, the biodegradable hypoallergenic resin was prepared by melt-mixing 2.5 parts by weight of lactic acid monomer to 100 parts by weight of polylactic acid at 160 ° C. for 5 minutes.

[Example 2]

60 parts by weight of ethylene-vinylacetate copolymer, 15 parts by weight of Sukorez D-300, 10 parts by weight of biodegradable hypoallergenic resin, 3 parts by weight of rosin, 5 parts by weight of ethylene glycol, 4 parts by weight of loess, 2 parts by weight of pulp powder and ascorb 1 part by weight of acid was mixed and melt kneaded at 170 to 180 ° C. to prepare an adhesive composition, and then molded into pellets. At this time, the biodegradable hypoallergenic resin was prepared by melt-mixing 2.5 parts by weight of lactic acid monomer to 100 parts by weight of polylactic acid at 160 ° C. for 5 minutes.

[Example 3]

Except for adding 1 part by weight of nanosilica, it was prepared in the same manner as in Example 1, and was made as Example 3.

[Comparative Example]

It was used after removing the backing paper from the conventional TPU hot melt film.

[Experimental Example]

(1) Mesh adhesive strength

In order to evaluate the mesh adhesive strength of the hot melt adhesive, the adhesive pellet quantified between the drop preventing nets 100 was melt-coated at 170 ° C., and then pressed at 130 ° C. for 30 seconds at a pressure of 60 kgf / cm 2. Mesh adhesion strength (kgf / cm 2) was measured.

(2) Melt Flow Index

The heating cylinder of the melt flow rate meter was filled with a pellet type adhesive and melted at 160 ° C. for about 5 minutes. The weight (g) of the adhesive passed through the cylinder for 10 minutes was measured by putting a weight of 3 kg.

As can be seen from the table, it was confirmed that the adhesive composition of the present invention has improved adhesion and flow index than the existing product, even when using a biodegradable hypoallergenic resin it was confirmed that the adhesion and flow index does not fall significantly. Also, when the nano-silica is mixed, the flow index can be seen to increase significantly.

The above-described embodiments are for illustrative purposes, and those of ordinary skill in the art to which the above-described embodiments belong may easily change to other specific forms without changing the technical spirit or essential features of the above-described embodiments. I can understand. Therefore, it is to be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

It is to be understood that the scope of the present invention is defined by the appended claims rather than the foregoing description and should be construed as including all changes and modifications that come within the meaning and range of equivalency of the claims, .

10: Multifunctional Falling Protection Screen
100: drop protection net
200: support frame
210: first frame
211: first support
212: second support
213: third support portion 213
220: second frame
230: frame rotating part
231: rotating part
232: rotating part
240: fastening part
250: support plate
300: fixed rope
500: shock absorber

Claims (2)

Drop prevention net to form an opening corresponding to the shape of the pillar of the tower crane; And
It includes a support frame which is installed along the edge of the drop prevention net so as to maintain the shape of the drop prevention net,
Further comprising a fixing rope for fixing the support frame to the tower crane,
The support frame has a hollow inner side so that the drop preventing net can be installed in the inner space.

"First frame formed in the shape; the inner side is empty so that the fall prevention net can be installed in the inner space"

"Is formed in a shape, the second frame facing the first frame is formed to form an opening corresponding to the shape of the pillar of the tower crane; one facing surface of the first frame and one facing surface of the second frame A frame rotating part for rotatably connected and installed, and a fastening part for fastening the other side of the first frame and the other side of the second frame,
The first frame may include a first support part extending in a horizontal direction, a second support part extending from one side of the first support part in the second frame direction, and another side of the first support part in the second frame direction. A third support extending, wherein said first support, said second support and said second support are "

"Form the shape,
The third support part is formed independently of the first support part, and is formed as a frame having an empty “ㅁ” shape so that the drop preventing net is installed in an inner space, and a shear surface of the other side of the first support part. To be pivotally connected to the
The first support part is formed independently from the second support part, and the inner side is formed of an empty frame so that the drop preventing net can be installed in the inner space, and is connected to the second support part so as to be rotated at an inclined surface at an angle of 45 °. Installed,
The first frame is first folded to be superimposed with the first support so that the third support is superimposed with the first support so as to be stored with reduced total volume, and then the second support is superimposed with the second support.
The frame rotating part may include: a rotating part connected to one side facing surface of the first frame and one side facing surface of the second frame to be rotatable; And a rotating part installed at a lower portion of the rotating part so that the first frame or the second frame is rotated in a downward direction and is folded below the other frame.
The first frame is third-folded so that the first frame and the second frame overlap each other by the pivoting part after the first folding and the second folding,
The support frame, the support plate is formed in the form of "b" is installed on the lower side of the other side of the second frame, the support plate for supporting the other side of the first frame with the front end bent in the first frame direction; And an impact absorbing part installed at an upper end of the support plate to absorb an impact according to the seating of the first frame by using an elastic force.
The shock absorbing unit may include a support frame on which the first frame is seated; Four support plates supporting the support frame seated on the upper side; Four pairs of support frames including a first frame and a second frame rotatably connected to lower portions of the four support plates; The first frame is connected to the upper side in such a manner that the first frame can pivot and slide in the horizontal direction, and the second frame is connected to the first frame in such a manner that the second frame can be rotated and vertically slidably moved. Comprising a column,
The supporting column includes: a pillar body formed in a square pillar shape; Cruciform grooves are formed recessed in the upper portion of the pillar body in a "+"shape; A cross elastic portion formed in a shape corresponding to the shape of the cross groove and inserted into the cross groove and connected to the upper portion of the four branches so that the lower side of the first frame is rotatable; Four vertical grooves formed vertically on each side of the column body; And four vertical elastic parts formed in a shape corresponding to the shape of the vertical grooves, respectively inserted into the vertical grooves, and installed on the upper outer side so that the lower side of the second frame is rotatable. delete

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