Villa elevator cross beam and stand column structure

Abstract

The utility model relates to the field of building parts, in particular to a villa elevator beam and stand column structure which comprises a stand column and a beam matched with the stand column, the side wall, making contact with the beam, of the stand column is provided with a positioning part, and the side, making contact with the beam, of the stand column is provided with a first beam buckle plate. A first positioning groove used for positioning the side edge of the glass wall is formed between the first cross beam buckle plate and the positioning part, the corner, corresponding to the first positioning groove, of the top face of the cross beam is sunken inwards, and the cross beam is provided with a cross beam decoration plate located on the same side with the positioning part. A second positioning groove used for positioning the side edge of the glass wall is formed in the concave position of the cross beam decorative plate and the cross beam. The cross beam stand column has the effects of improving the strength of the cross beam stand column, facilitating installation of the cross beam stand column by workers and reducing the use cost.

Description

Technical Field

[0001] The present application relates to the field of building components, and in particular, to a crossbeam and column structure for a villa ladder. Background Art

[0002] The crossbeam and column of the elevator hoistway mainly play the role of supporting the entire elevator hoistway structure; the crossbeam and column in the villa sightseeing elevator are also responsible for supporting the glass wall. Existing crossbeams and columns are mostly formed by extruding aluminum profiles. In order to position the glass wall, it is necessary to extrude the aluminum profile to form a groove for positioning the glass. However, the existing material cost is relatively high, there is too much bending of the aluminum material, and the corner strength is average. Summary of the Utility Model

[0003] In order to improve the strength of the crossbeam and column, facilitate the installation of the crossbeam and column by the staff, and reduce the use cost, the present application provides a crossbeam and column structure for a villa ladder.

[0004] A crossbeam and column structure for a villa ladder provided by the present application adopts the following technical solutions:

[0005] A crossbeam and column structure for a villa ladder includes a column and a crossbeam cooperating with the column. A positioning portion is provided on the side wall of the column in contact with the crossbeam. A first crossbeam buckle plate is provided on one side of the column in contact with the crossbeam. A first positioning groove for positioning the side of the glass wall is formed between the first crossbeam buckle plate and the positioning portion. The corner of the crossbeam corresponding to the first positioning groove is recessed inward. A crossbeam decorative plate is provided on the crossbeam on the same side as the positioning portion. A second positioning groove for positioning the side of the glass wall is formed between the crossbeam decorative plate and the recessed position of the crossbeam.

[0006] By adopting the above technical solutions, the positioning portion and the first crossbeam buckle plate cooperate to form a first positioning groove for positioning the side of the glass wall, improving the adaptability of the crossbeam and column structure and at the same time improving the positioning effect of the crossbeam and column on the glass wall; the recessed corner of the crossbeam cooperates with the crossbeam decorative plate to position the side of the glass wall. The first positioning groove and the second positioning groove improve the stability of the glass wall on the crossbeam and column. The crossbeam decorative plate facilitates the installation of the glass, allowing the staff to install the glass both inside and outside, and reducing the possibility of scratching and deformation of the crossbeam corners during installation.

[0007] Preferably, a reinforcing plate is provided on the crossbeam. The reinforcing plate includes a first connecting portion extending along the length direction of the crossbeam and a second connecting portion extending along the height direction of the column.

[0008] By adopting the above technical solutions, the first connecting portion is connected to the crossbeam, and the second connecting portion is connected to the column, and the reinforcing plate improves the stability between the crossbeam and the column.

[0009] Preferably, a second crossbeam buckle plate is provided at the bottom of the crossbeam. A third positioning groove is formed between the second crossbeam buckle plate and the crossbeam decorative plate.

[0010] By adopting the above technical solution, the positioning groove three formed between the crossbeam buckle plate two and the crossbeam decorative plate facilitates the positioning of both the upper and lower sides of the crossbeam for the side of the glass wall.

[0011] Preferably, a through groove one is provided along the length direction inside the crossbeam buckle plate one, and a limiting groove one communicating with the through groove one is provided along the length direction on the side of the crossbeam buckle plate one facing the column; a through groove two is provided along the length direction on the side of the crossbeam buckle plate two facing the column, and a limiting groove two communicating with the through groove two is provided along the length direction on the side of the crossbeam buckle plate two facing the crossbeam.

[0012] By adopting the above technical solution, the through groove one reduces the weight of the crossbeam buckle plate one and saves the production cost, and the limiting groove one facilitates the fixation of the crossbeam buckle plate one and the column; the through groove two reduces the weight of the crossbeam buckle plate two and saves the production cost, and the limiting groove two facilitates the fixation of the crossbeam buckle plate two and the crossbeam.

[0013] Preferably, a positioning member one for connecting the crossbeam buckle plate one and the column is provided on the crossbeam buckle plate one, and a positioning member two for connecting the crossbeam buckle plate two and the crossbeam is provided on the crossbeam buckle plate two.

[0014] By adopting the above technical solution, the positioning member one improves the stability between the crossbeam buckle plate one and the column, and the positioning member two improves the stability between the crossbeam buckle plate two and the crossbeam. At the same time, it is convenient to control the width between the crossbeam buckle plate one and the positioning part, and the width between the crossbeam buckle plate two and the crossbeam decorative plate according to the required width of the side of the glass wall.

[0015] Preferably, a hollow sandwich layer is provided inside the crossbeam decorative plate, and a plurality of support plates are provided along the length direction of the crossbeam decorative plate.

[0016] By adopting the above technical solution, the hollow sandwich layer is used to save the processing cost of the crossbeam decorative plate, and the plurality of support plates improve the strength of the crossbeam decorative plate.

[0017] Preferably, a positioning member three for connecting the crossbeam decorative plate and the crossbeam is provided on the crossbeam decorative plate. The positioning member three includes a limiting part and a threaded part, and the width of the limiting part is larger than the width of the threaded part.

[0018] By adopting the above technical solution, the positioning member three improves the stability between the crossbeam decorative plate and the crossbeam. The limiting part improves the fixing effect of the positioning member three, and the threaded part is used for the threaded fixation of the positioning member three.

[0019] Preferably, an embedding groove is provided on the side of the crossbeam decorative plate facing the crossbeam. The embedding groove communicates with the space between two adjacent support plates. The width of the limiting part is larger than the width of the embedding groove, and the width between two adjacent support plates is larger than the width of the limiting part.

[0020] By adopting the above technical solution, the embedding groove is used for the threaded portion to pass through. The embedding groove communicates with the space between two adjacent support plates, facilitating the limiting portion to enter the space between two adjacent support plates. The width, i.e., the spacing, between two adjacent support plates is larger than the width of the limiting portion, facilitating the accommodation of the limiting portion, improving the stability of the limiting portion, and at the same time improving the fixing effect of the positioning member on the three pairs of crossbeam decorative plates and the crossbeam.

[0021] Preferably, a plurality of grooves located in the second positioning groove and / or the third positioning groove are formed on the side of the crossbeam decorative plate facing the crossbeam, and the grooves extend along the length direction of the crossbeam decorative plate.

[0022] By adopting the above technical solution, the grooves increase the friction on the side of the crossbeam decorative plate facing the crossbeam, improve the stability of the side of the glass wall in the second positioning groove or the third positioning groove, and at the same time the grooves facilitate the installation of the side of the glass wall in the second positioning groove or the third positioning groove.

[0023] Preferably, an avoidance groove communicating with the first positioning groove is formed in the column along the length direction, and the avoidance groove is located at one end of the first positioning groove close to the positioning portion.

[0024] By adopting the above technical solution, the avoidance groove is used to avoid the corners of the glass or other accessories, and improve the stability of the glass or other accessories on the column.

[0025] In summary, the positioning portion and the first crossbeam buckle plate provide the first positioning groove for positioning the side of the glass wall, improving the positioning effect of the column on the glass; at the same time, the first crossbeam buckle plate reduces the number of bending times of the column, improves the strength of the column, and reduces the possibility of deformation of the column corners caused by impact; the crossbeam decorative plate and the concave position of the crossbeam corner form the second positioning groove, and the second positioning groove is used to position the side of the glass wall, cooperating with the first positioning groove to position the side of the glass wall, and improving the positioning effect of the crossbeam column on the glass wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the structural schematic diagram of a crossbeam column structure of a villa ladder in the present application Figure 1 ;

[0027] Figure 2 is the structural schematic diagram of a crossbeam column structure of a villa ladder in the present application Figure 2 ;

[0028] Figure 3 is the structural schematic diagram of the column in the present application Figure 1 ;

[0029] Figure 4 is the structural schematic diagram of the crossbeam in the present application;

[0030] Figure 5 is the structural schematic diagram of the crossbeam decorative plate in the present application;

[0031] Figure 6 is the structural schematic diagram of the column of the present application Figure 2 ;

[0032] Figure 7 is the structural schematic diagram of the column of the present application Figure 3 .

[0033] Explanation of reference numerals: 1, column; 2, cross beam; 3, positioning part; 4, first cross beam buckle plate; 41, first through groove; 42, first limiting groove; 5, first positioning groove; 6, cross beam decorative plate; 61, hollow interlayer; 62, support plate; 7, second positioning groove; 8, reinforcing plate; 81, first connecting part; 82, second connecting part; 9, second cross beam buckle plate; 91, second through groove; 92, second limiting groove; 10, third positioning groove; 11, first positioning member; 12, second positioning member; 13, third positioning member; 131, limiting part; 132, threaded part; 14, embedding groove; 15, groove; 16, avoiding groove. Detailed implementation manners

[0034] The following further describes the present utility model in conjunction with the attached Figures 1 - 7 The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present utility model.

[0035] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0036] The embodiment of the present application discloses a cross beam and column structure for a villa ladder. Referring to Figure 1 and Figure 2 , it includes a column 1 and a cross beam 2. In the embodiment of the present application, the column 1 is made of steel, and the column 1 is in an L-shaped hollow shape in the embodiment of the present application, which is convenient for adapting to the corners of the villa ladder and facilitating the installation and cooperation between the cross beam 2 and the column 1. The right-angle corners of the column 1 are arc-shaped, which improves the arc degree of the corners of the column 1 and reduces the possibility of deformation of the corners of the column 1. The side wall of the column 1 in contact with the cross beam 2 is provided with a positioning part 3 facing the cross beam 2. In the embodiment of the present application, the positioning part 3 is a double-layer setting of the wall thickness of the column 1, which improves the strength of the positioning part 3. A first cross beam buckle plate 4 is provided along the length direction on one side of the column 1 in contact with the cross beam 2. A first positioning groove 5 is formed between the first cross beam buckle plate 4 and the positioning part 3. The first positioning groove 5 is used for positioning the side of the glass wall, which improves the stability of the glass installed on the column 1.

[0037] Referring to Figure 1And Figure 2 ,the top surface of the cross beam 2 is recessed inward corresponding to the corners of the positioning groove 1-5. A cross beam decorative plate 6 is installed on the side wall of the cross beam 2 on the same side as the positioning part 3. A positioning groove 2-7 is formed between the cross beam decorative plate 6 and the recessed position of the cross beam 2. The positioning groove 2-7 is used to position the side of the glass wall, improving the stability of the glass wall on the cross beam 2. A cross beam buckle 2-9 is installed on the bottom surface of the cross beam 2. A positioning groove 3-10 communicating with the positioning groove 1-5 is formed between the cross beam buckle 2-9 and the cross beam decorative plate 6. The positioning groove 2-7 and the positioning groove 3-10 enable the cross beam 2 to position the glass both above and below. During the specific use process, the recessed position of the cross beam 2 can be one of the side corners with the bottom facing the cross beam decorative plate 6, and the cross beam buckle 2-9 can be arranged on the top surface of the cross beam 2, implementing diverse angles.

[0038] In the embodiment of the present application, referring to Figure 1 and Figure 2 ,the right-angled ends of the column 1 are respectively matched with a group of cross beams 2. During the specific installation process, the cross beam 2 can be installed and matched at the end of the column 1, or can be matched at the middle of the column 1 or any position in the height direction.

[0039] Referring to Figure 1 and Figure 3 ,in order to strengthen the stability between the cross beam 2 and the column 1, a reinforcing plate 8 is fixedly installed on the cross beam 2. The reinforcing plate 8 includes a connecting part 1-81 and a connecting part 2-82. The connecting part 1-81 extends along the length direction of the cross beam 2, and the connecting part 2-82 extends along the height direction of the column 1. In the embodiment of the present application, the reinforcing plate 8 is fixed by bolts or pan head screws. In the embodiment of the present application, one column 1 is connected to two cross beams 2, and two groups of reinforcing plates 8 are required to fix the column 1 and the two cross beams 2.

[0040] Referring to Figure 3 and Figure 4 ,in the embodiment of the present application, the connecting part 2-82 and the column 1 are fixed together by bolts and nuts; the connecting part 1-81 and the cross beam 2 are fixed by bolts and nuts, thereby indirectly improving the connection stability between the column 1 and the cross beam 2, facilitating the installation or disassembly by the staff.

[0041] Referring to Figure 3 and Figure 6, in order to further improve the fixing effect between the two connecting parts II 82 and the column 1, a connecting plate is provided on the inner side wall of the column 1 close to the connecting part II 82. The connecting plate is correspondingly arranged in an L shape corresponding to the shape of the column 1 in the embodiment of the present application, which is convenient for fitting the inner side wall of the column 1. Threaded holes are provided in the connecting plate corresponding to the through holes through which the bolts pass. The connecting plate is used for connecting the bolts of the two connecting parts II 82, which is convenient for the bolts to fix the connecting part II 82 and the column 1 together, and improves the stability of the two connecting parts II 82 on the column 1. The right-angle corners of the connecting plate are rounded to reduce the possibility of the connecting plate being bumped during handling or disassembly, and thus being deformed.

[0042] Referring to Figure 2 and Figure 3 , in order to reduce the weight of the crossbeam buckle I 4 and the crossbeam buckle II 9 and save production costs. A through groove I 41 is provided in the crossbeam buckle I 4 along the length direction, and a limiting groove I 42 communicating with the through groove I 41 is provided in the crossbeam buckle I 4 along the length direction on the side facing the column 1. A positioning member I 11 is installed on the crossbeam buckle I 4. The positioning member I 11 is used to fix the crossbeam buckle I 4 and the column 1, and improve the stability of the crossbeam buckle I 4 on the column 1. The positioning member I 11 includes a tightening part I and an abutting part I provided at one end of the tightening part. External threads are provided on the outer side wall of the tightening part I, and threaded holes adapted to the external threads are provided on the column 1. The width of the abutting part I is larger than the width of the limiting groove I 42, and the width of the tightening part I is smaller than the width of the limiting groove I 42. The abutting part I is located in the through groove 41, and the tightening part I passes through the limiting groove I 42 and is threadedly connected to the column 1. The abutting part I locks the column 1 by means of the tightening part I and clamps and fixes the crossbeam buckle I 4 on the column 1. The positioning member I 11 adopts bolts or pan head screws in the embodiment of the present application. The width of the limiting groove I 42 is smaller than the width of the bolt head, and the width of the limiting groove I 42 is larger than the width of the threaded column of the bolt.

[0043] Referring to Figure 2 and Figure 4, the crossbeam buckle plate two 9 is provided with a through groove two 91 along the length direction, and a limiting groove two 92 communicating with the through groove two 91 is opened along the length direction on the side of the crossbeam buckle plate two 9 facing the crossbeam 2. A positioning member two 12 is installed on the crossbeam buckle plate two 9. The positioning member two 12 is used to fix the crossbeam buckle plate two 9 on the crossbeam 2. The positioning member two 12 includes a tightening part two and an abutting part two arranged at the end of the tightening part two. The width of the abutting part two is smaller than the width of the limiting groove two 92, and the width of the tightening part two is larger than the width of the limiting groove two 92. The abutting part two is located in the through groove two 91, and the tightening part two passes through the limiting groove two 92 and is threadedly connected to the crossbeam 2, which is convenient for the tightening part two to cooperate with the abutting part two to position the crossbeam 2 and the crossbeam buckle plate two 9. The positioning member two 12 adopts a bolt or a pan head screw in the implementation of this application. The bolt head corresponds to the abutting part two, and the threaded column of the bolt corresponds to the tightening part two. During the installation process, the installer can first determine the width of the positioning groove two 7, drill holes at the corresponding positions, install bolts, and then there is a space for the crossbeam buckle plate two 9 to be inserted between the bolt head and the crossbeam 2. Directly align the limiting groove two 92 with the bolt position, and push the crossbeam buckle plate two 9 to be installed on the crossbeam 2. The bolt head positions the crossbeam buckle plate two 9.

[0044] Refer to Figure 1 and Figure 4 , the crossbeam decorative plate 6 adopts aluminum in the embodiment of this application and can adopt steel in the specific implementation process. A hollow sandwich layer 61 is opened in the crossbeam decorative plate 6. A plurality of support plates 62 are fixed along the length direction of the crossbeam decorative plate 6. The support plates 62 improve the strength of the crossbeam decorative plate 6, and the hollow sandwich layer 61 is used to reduce the processing cost of the crossbeam decorative plate 6. In order to improve the stability of the crossbeam decorative plate 6 on the crossbeam 2, a positioning member three 13 is installed on the crossbeam decorative plate 6. The positioning member three 13 includes a limiting part 131 and a threaded part 132 fixed at one end of the limiting part 131. A threaded hole adapted to the external thread on the threaded part 132 is opened on the crossbeam 2. The width of the limiting part 131 is larger than the width of the threaded part 132 to improve the positioning effect of the limiting part 131.

[0045] Refer to Figure 4 , an embedding groove 14 is opened along the length direction on the side of the crossbeam decorative plate 6 facing the crossbeam 2. The embedding groove 14 communicates with the space between two adjacent support plates 62. The width of the limiting part 131 is larger than the width of the embedding groove 14, and the distance between two adjacent support plates 62 is larger than the width of the limiting part 131. After the threaded part 132 is threadedly tightened with the crossbeam 2, the limiting part 131 clamps and positions the crossbeam decorative plate 6 on the crossbeam 2.

[0046] Refer to Figure 1 and Figure 4, the side of the glass wall is installed in the second positioning groove 7. To improve the stability of the glass on the cross beam 2, several grooves 15 communicating with the second positioning groove 7 are provided along the length direction on the side of the cross beam decorative plate 6 facing the cross beam 2. Several grooves 15 communicating with the third positioning groove 10 are provided along the length direction on the side of the cross beam decorative plate 6 facing the cross beam 2. The grooves 15 facilitate the insertion of the glass into the second positioning groove 7 or the third positioning groove 10, improving the stability of the glass on the cross beam 2.

[0047] Referring to Figure 1 and Figure 5 , to further reduce the weight of the cross beam decorative plate 6, the side of the cross beam decorative plate 6 facing the cross beam 2 is open, and a first fitting block that fits the side wall of the cross beam 2 is provided on the side of the support plate 62 facing the cross beam 2. Second fitting blocks are provided at the ends where the two side walls of the cross beam decorative plate 6 contact the side walls of the cross beam 2. The second fitting blocks are provided with grooves along the length direction, facilitating the installation of the glass on the cross beam 2.

[0048] Referring to Figure 6 and Figure 7 , to further improve the positioning effect of the column 1 on the glass or other accessories. An avoidance groove 6 communicating with the first positioning groove 5 is provided along the length direction of the column 1. The avoidance groove 6 is located at the corner of the first positioning groove 5 close to the positioning portion 3. When installing the glass or accessories, the avoidance groove 6 can effectively avoid the acute angles of the glass or accessories, improving the stability of the glass or accessories on the column.

[0049] The implementation principle of a villa ladder cross beam and column structure in an embodiment of the present application is as follows: First, determine the width of the first positioning groove 5 according to the thickness of the glass to be positioned, and then fixedly install the first cross beam buckle plate 4 on the column 1 through the first positioning member 11; the second positioning member 12 fixedly installs the second cross beam buckle plate 9 on the cross beam 2, and the third positioning member 13 fixedly installs the cross beam decorative plate 6 on the cross beam 2. Then install the glass on the cross beam 2 and the column 1, and further tighten the first positioning member 11, the second positioning member 12, and the third positioning member 13 to improve the stability of the glass on the cross beam 2 and the column 1. The on-site staff adjusts the fixed position of the first cross beam buckle plate 4 as needed, and adjusts the position of the second cross beam buckle plate 9 according to the position of the first cross beam buckle plate 4. In the specific implementation process, the cross beam 2 and the column 1 can be in an L-shaped fit or a cross-shaped fit, and can be correspondingly planned according to the number of glass panels arranged in the elevator, with good adaptability. At the same time, the column 1 and the cross beam 2 of the present application are made of steel, with good strength and low cost.

[0050] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A beam and column structure for a villa ladder, characterized in that: It includes a column (1) and a cross beam (2) that cooperates with the column (1). A positioning portion (3) is provided on the side wall of the column (1) that contacts the cross beam (2). On one side of the column (1) that contacts the cross beam (2), there is a first cross beam buckle plate (4). A first positioning groove (5) for positioning the side edge of the glass wall is formed between the first cross beam buckle plate (4) and the positioning portion (3). The corner of the top surface of the cross beam (2) corresponding to the first positioning groove (5) is recessed inward. A cross beam decorative plate (6) is provided on the cross beam (2) on the same side as the positioning portion (3). A second positioning groove (7) for positioning the side edge of the glass wall is formed between the cross beam decorative plate (6) and the recessed position of the cross beam (2).

2. The crossbeam column structure of a villa ladder according to claim 1, characterized in that: A reinforcing plate (8) is provided on the cross beam (2). The reinforcing plate (8) includes a first connecting portion (81) extending along the length direction of the cross beam (2) and a second connecting portion (82) extending along the height direction of the column (1).

3. A beam column structure of a villa ladder according to claim 2, characterized in that: A second cross beam buckle plate (9) is provided at the bottom of the cross beam (2). A third positioning groove (10) is formed between the second cross beam buckle plate (9) and the cross beam decorative plate (6).

4. A crossbeam and column structure of a villa ladder according to claim 3, characterized in that: A first through groove (41) is opened along the length direction inside the first cross beam buckle plate (4). A first limiting groove (42) communicating with the first through groove (41) is opened along the length direction on the side of the first cross beam buckle plate (4) facing the column (1); A second through groove (91) is opened along the length direction on the side of the second cross beam buckle plate (9) facing the column (1). A second limiting groove (92) communicating with the second through groove (91) is opened along the length direction on the side of the second cross beam buckle plate (9) facing the cross beam (2).

5. A crossbeam column structure of a villa ladder according to claim 4, characterized in that: A first positioning member (11) for connecting the first cross beam buckle plate (4) and the column (1) is provided on the first cross beam buckle plate (4). A second positioning member (12) for connecting the second cross beam buckle plate (9) and the cross beam (2) is provided on the second cross beam buckle plate (9).

6. A crossbeam and column structure of a villa ladder according to claim 1, characterized in that: A hollow interlayer (61) is provided inside the cross beam decorative plate (6). A plurality of support plates (62) are provided along the length direction of the cross beam decorative plate (6).

7. A crossbeam column structure of a villa ladder according to claim 6, characterized in that: A third positioning member (13) for connecting the cross beam decorative plate (6) and the cross beam (2) is provided on the cross beam decorative plate (6). The third positioning member (13) includes a limiting portion (131) and a threaded portion (132). The width of the limiting portion (131) is larger than the width of the threaded portion (132).

8. A crossbeam column structure of a villa ladder according to claim 7, characterized in that: An embedding groove (14) is opened on the side of the cross beam decorative plate (6) facing the cross beam (2). The embedding groove (14) communicates with the space between two adjacent support plates (62). The width of the limiting portion (131) is larger than the width of the embedding groove (14). The width between two adjacent support plates (62) is larger than the width of the limiting portion (131).

9. A crossbeam column structure of a villa ladder according to claim 1, characterized in that: A plurality of grooves (15) located in the second positioning groove (7) and / or the third positioning groove (10) are opened on the side of the cross beam decorative plate (6) facing the cross beam (2). The grooves (15) extend along the length direction of the cross beam decorative plate (6).

10. A crossbeam column structure of a villa ladder according to claim 1, characterized in that: An avoidance groove (16) communicating with the first positioning groove (5) is opened along the length direction of the column (1). The avoidance groove (16) is located at one end of the first positioning groove (5) close to the positioning portion (3).

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