A subway station steel support connected hanging plate and its construction technology

Abstract

The present invention relates to the technical field of installation of steel support hanging plates for subway stations, specifically to a one-piece steel support hanging plate for subway stations and a construction process thereof. The one-piece hanging plate comprises a hanging plate, a flange plate, a steel support tube and a sealing plate, and has the following beneficial effects: by arranging the coordination of uprights, stepped columns and sealing plates, it is adapted to the installation of flange plates of different sizes, thereby improving the installation and use range of the hanging plate; the sealing plate is utilized to form a gap between the flange plate and the steel support tube, thereby facilitating the installation of the support plate, forming a stable support for the end of the steel support tube, and improving the stress strength; the cone rod is driven forward by the rotation of the screw tube, thereby driving the fan-shaped slider to advance and fit with the inner wall of the steel support tube, thereby increasing the staggered connection length between the hanging plate and the steel support tube, further improving the stress strength of the steel support tube, and at the same time enabling the fan-shaped slider to adapt to steel support tubes of different inner diameters, greatly enhancing the adaptability and installation range of the hanging plate.

Description

Technical Field

[0001] The invention relates to the technical field of steel support hanging plate installation for subway stations, in particular to a steel support connected hanging plate for subway stations and a construction process thereof. Background Art

[0002] The hanging plates currently used for steel supports in urban subway stations are welded upper hanging teeth hung on the edge of the steel purlin. The flat plate at the bottom of the hanging plate holds the steel support. When installing the steel support, first hang the hanging plate on the purlin, then put the steel pipe support into the hanging plate, and support the steel support through the hanging plate.

[0003] A steel support hanging plate with application number CN201920924058.3 discloses a fixed connection between the hanging plate and the steel support, but its connection position is supported by a flange plate. When the outer diameter of the steel support tube changes, the overall structure of the hanging plate needs to be adjusted so that the connection position of its bolts is suitable for the installation of the new flange plate.

[0004] The existing hanging plates cannot be adapted to different flange plate installations, which limits the scope of its installation and use. For the steel support pipes installed with the hanging plates, the size of the hanging plates corresponds one to one with the size of the steel support pipes. When the sizes do not correspond, the steel support cannot ensure axial force, and the fixing position of the steel support pipe is small. It is only fixed by the connection between bolts and flanges, which is easy to cause breakage when subjected to a large impact force. Summary of the Invention

[0005] The purpose of the present invention is to provide a subway station steel support connected type hanging plate and its construction process, so as to solve the pressure bearing and adaptation range problems of the hanging plate.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A subway station steel support one-piece hanging plate, the one-piece hanging plate comprising:

[0008] A hanging plate, wherein the upper and lower ends of the hanging plate are respectively slidably connected with a lower support plate and an upper support plate, one side of the hanging plate is fixed to the surrounding purlin through the upper support plate, a stud is provided in the middle of the other side of the hanging plate, and the outer wall of the stud is provided with four groups of columns distributed in a circumferential array, and the ends of the columns are provided with stepped columns;

[0009] A flange plate, wherein the outer edge of the flange plate is provided with four groups of mounting holes distributed in a circumferential array, and the flange plate is provided with positioning holes corresponding one-to-one with the columns, the positioning holes are sleeved on the stepped columns, and the side surface of the flange plate is pressed onto the stepped surface between the columns and the stepped columns, and the lower and upper support plates are clamped and fixed at the upper and lower ends of the flange plate;

[0010] A sealing plate, wherein the sealing plate is fixed to the end face of the step column by fastening screws, one side of the sealing plate is attached to the flange plate, and the other side of the sealing plate is provided with four groups of fixing rods distributed in a circumferential array, the ends of the fixing rods are connected with a pair of first fixing rings and second fixing rings distributed in parallel, six groups of fan-shaped sliders distributed in a circumferential array are slidably inserted in the gap between the first fixing ring and the second fixing ring, a tapered rod is inserted in the middle of the six groups of fan-shaped sliders, a connecting rod is provided at the other end of the tapered rod, the connecting rod and the tapered rod are rotatably connected by a bearing, the other end of the connecting rod passes through the flange plate and the sealing plate, and the end of the connecting rod is provided with a screw tube that is threaded and rotatably sleeved on the stud;

[0011] The ends of the steel support pipe are fixedly connected to the flange plate, the lower support plate and the upper support plate by connecting bolts inserted into the mounting holes.

[0012] Preferably, a slide groove is vertically provided in the middle of the upper and lower ends of the hanging plate, and a slide plate is provided on the lower support plate and the upper support plate. The slide plate is slidably inserted in the slide groove, and the slide plate is fixed to the side wall of the hanging plate by a through bolt.

[0013] Preferably, the upper support plate and the lower support plate are both provided with a clamping frame corresponding to the flange plate, the thickness of the clamping frame is the same as the thickness of the flange plate, the clamping frame is provided with a through hole that coincides with the mounting hole, and the connecting bolt is inserted through the through hole and the mounting hole.

[0014] Preferably, the sealing plate is pressed onto the end face of the steel support tube, the outer diameter of the sealing plate is smaller than that of the flange plate, and one side of the clamping frame is inserted into the gap formed on the outer side of the sealing plate.

[0015] Preferably, the left and right end faces of the fan-shaped slider are provided with sliding bars, and a pair of the sliding bars distributed on the left and right are slidably inserted into the first fixed ring and the second fixed ring. The first fixed ring and the second fixed ring are connected by a fixed rod located in the gap between adjacent fan-shaped sliders, and the arc-shaped outer wall of the fan-shaped slider rests on the inner wall of the steel support tube.

[0016] Preferably, a connecting plate is provided on one side of the upper end of the purlin on the upper supporting plate, and a pair of front-to-back symmetrical connecting holes are provided on the connecting plate, and screws fixedly connected to the purlin are inserted into the connecting holes.

[0017] Preferably, a through hole is provided in the middle of the flange plate and the sealing plate, one end of the connecting rod is fixedly connected to the spiral tube, and the middle section of the connecting rod passes through the flange plate and the sealing plate in sequence along the through hole.

[0018] Preferably, a threaded inner hole is provided on the stepped column, and the fastening screw passes through the sealing plate and is threadably installed in the threaded inner hole.

[0019] A construction process for implementing the aforementioned subway station steel support connected hanging plate comprises the following steps:

[0020] Install the screw tube and turn the screw thread to install it on the stud;

[0021] Install the flange plate. Select a flange plate with a suitable outer diameter according to the size of the steel support pipe. Insert the flange plate along the positioning socket into the stepped surface of the column and the stepped column to achieve pre-installation. Then, insert the sealing plate and tighten the screws to achieve extrusion-type fixed installation of the flange plate.

[0022] To install the tapered rod, insert the tapered rod between the sector sliders and rotate the end of the connecting rod to the end bearing of the tapered rod;

[0023] To install the support plate, plug the lower support plate and the upper support plate along the slide groove, clamp them on the flange plate through the clamping frame, plug the steel support tube so that the fan-shaped slider extends into the inner cavity of the steel support tube, and use the connecting bolts to achieve fixed connection between the end of the steel support tube, the lower support plate, the upper support plate and the flange plate;

[0024] The rotation of the screw tube on the stud causes the conical rod to advance, thereby increasing the inner diameter of the conical rod in the fan-shaped slider, driving the fan-shaped slider to slide outward. As the advancement continues, the six groups of fan-shaped sliders distributed in a circular array rest against the arc inner wall of the steel support tube.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention is suitable for the installation of flange plates of different sizes by arranging the coordination of columns, stepped columns and sealing plates, thereby improving the installation and use range of the hanging plate, and utilizing the sealing plate to form a gap between the flange plate and the steel support tube, thereby facilitating the installation of the support plate, forming a stable support for the end of the steel support tube, and improving the stress strength, and driving the cone rod to advance through the rotation of the screw tube, thereby driving the fan-shaped slider to advance and fit with the inner wall of the steel support tube, increasing the staggered connection length between the hanging plate and the steel support tube, further improving the stress strength of the steel support tube, and at the same time enabling the fan-shaped slider to adapt to steel support tubes of different inner diameters, greatly enhancing the adaptable installation range of the hanging plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the installation structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the flange plate of the present invention;

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure of the hanging plate of the present invention;

[0031] Figure 5 is a side view of the present invention;

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the upper supporting plate of the present invention;

[0033] Figure 7 It is a schematic diagram of the installation three-dimensional structure of the present invention.

[0034] In the figure: 1. Purlin; 2. Steel support pipe; 3. Hanging plate; 4. Slide; 5. Lower support plate; 6. Stud; 7. Screw; 8. Connecting rod; 9. Conical rod; 10. Flange plate; 11. Sealing plate; 12. First fixing ring; 13. Second fixing ring; 14. Fan-shaped slider; 15. Column; 16. Upper support plate; 17. Connecting bolt; 18. Fixing rod; 19. Mounting hole; 20. Through hole; 21. Positioning socket; 22. Stepped column; 23. Threaded inner hole; 24. Through hole; 25. Fastening screw; 26. Slide; 27. Connecting plate; 28. Clamping frame; 29. ​​Connecting hole; 30. Slide plate. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 7 , the present invention provides a technical solution:

[0037] Example 1:

[0038] A steel support one-piece hanging plate for a subway station, comprising a hanging plate 3, a flange plate 10, a steel support pipe 2 and a sealing plate 11.

[0039] The lower and upper ends of the hanging plate 3 are respectively slidably connected with a lower supporting plate 5 and an upper supporting plate 16. One side of the hanging plate 3 is fixed to the purlin 1 through the upper supporting plate 16, and the hanging plate 3 is fixedly installed by the upper supporting plate 16.

[0040] The outer wall of the stud 6 is provided with four groups of columns 15 distributed in a circular array, and the end of the column 15 is provided with a stepped column 22. The outer edge of the flange plate 10 is provided with four groups of mounting holes 19 distributed in a circular array. The flange plate 10 is provided with positioning sockets 21 corresponding to the columns 15 one by one. The positioning sockets 21 are sleeved on the stepped columns 22, and the side of the flange plate 10 is pressed on the stepped surface between the column 15 and the stepped column 22. The lower support plate 5 and the upper support plate 16 are clamped and fixed to the upper and lower ends of the flange plate 10.

[0041] By utilizing the cooperation between the stepped columns 22 and the positioning sockets 21 , accurate installation of different flange plates 10 is achieved, thereby increasing the adaptability range of the hanging plate 3 .

[0042] The sealing plate 11 is fixed to the end surface of the stepped column 22 by means of fastening screws 25 , and one side of the sealing plate 11 is attached to the flange plate 10 .

[0043] The sealing plate 11 is fixed to the flange plate 10 by means of an extrusion method by tightening the screws 25 .

[0044] The end of the steel support tube 2 is fixedly connected to the flange plate 10, the lower support plate 5 and the upper support plate 16 by means of connecting bolts 17 inserted into the mounting holes 19. By setting a sliding connection between the lower support plate 5 and the upper support plate 16, the fan-shaped clamping of the flange plate 10 is achieved, thereby forming a support for the fan-shaped end face of the flange plate 10, further improving its support strength.

[0045] Four groups of fixing rods 18 distributed in a circular array are provided on the other side of the sealing plate 11. The ends of the fixing rods 18 are connected to a pair of first fixing rings 12 and second fixing rings 13 distributed in parallel. Six groups of fan-shaped sliders 14 distributed in a circular array are slidably inserted in the gap between the first fixing rings 12 and the second fixing rings 13. The positions of the sliders 14 are limited by the first fixing rings 12 and the second fixing rings 13, and the fixing rods 18 are used to achieve fixed installation of the first fixing rings 12 and the second fixing rings 13.

[0046] A stud 6 is provided in the middle of the other side of the hanging plate 3, and a tapered rod 9 is inserted in the middle of the six groups of fan-shaped sliders 14. A connecting rod 8 is provided at the other end of the tapered rod 9. The connecting rod 8 and the tapered rod 9 are rotatably connected by a bearing. The other end of the connecting rod 8 passes through the flange plate 10 and the sealing plate 11, and the end of the connecting rod 8 is provided with a screw tube 7 that is threaded and rotatably sleeved on the stud 6.

[0047] By rotating the screw tube 7 at the upper end of the stud 6, the push rod 9 is pushed horizontally, thereby squeezing the fan-shaped slider 14, so that the fan-shaped slider 14 is pressed against the inner wall of the steel support tube 2 to the outside, increasing the staggered connection length between the hanging plate 3 and the steel support tube 2, further improving the stress strength of the steel support tube 2, and at the same time making the fan-shaped slider 14 adaptable to steel support tubes 2 with different inner diameters, greatly enhancing the adaptability and installation range of the hanging plate 3.

[0048] Example 2:

[0049] On the basis of Example 1, in order to realize the positioning and sliding of the lower support plate 5 and the upper support plate 16, the present application also has a slide groove 4 vertically arranged in the middle of the upper and lower ends of the hanging plate 3, and a slide plate 30 is provided on the lower support plate 5 and the upper support plate 16. The slide plate 30 is slidably inserted in the slide groove 4, and the slide plate 30 is fixed to the side wall of the hanging plate 3 by through bolts.

[0050] By arranging the petals 30 and the slide groove 4, the positioning and sliding of the lower support plate 5 and the upper support plate 16 are achieved, so that the lower support plate 5 and the upper support plate 16 are accurately clamped at the upper and lower ends of the flange plate 10 to form support for the flange plate 10.

[0051] Example 3:

[0052] On the basis of Example 2, in order to achieve fixed installation of the lower support plate 5 and the upper support plate 16, the present application also has a clamping frame 28 corresponding to the flange plate 10 on both the upper support plate 16 and the lower support plate 5. The thickness of the clamping frame 28 is the same as the thickness of the flange plate 10. The clamping frame 28 is provided with a through hole 24 that coincides with the mounting hole 19. The connecting bolt 17 is inserted through the through hole 24 and the mounting hole 19. The sealing plate 11 is pressed on the end face of the steel support tube 2. The outer diameter of the sealing plate 11 is smaller than the flange plate 10. One side of the clamping frame 28 is inserted into the gap formed on the outside of the sealing plate 11.

[0053] By arranging the plug-in connection of the clamping frame 28, a staggered plug-in connection with the flange plate 10 is formed, so that the lower support plate 5 and the upper support plate 16 are integrally fixed to the steel support pipe 2, the flange plate 10 and the hanging plate 3, forming a stable connection structure.

[0054] Example 4:

[0055] On the basis of Example 3, in order to further limit the position of the fan-shaped slider 14 and prevent the fan-shaped slider 14 from rotating in a circle in the first fixed ring 12 and the second fixed ring 13, the present application also has slide bars 26 provided on the left and right end faces of the fan-shaped slider 14, and a pair of slide bars 26 distributed on the left and right are slidably inserted into the first fixed ring 12 and the second fixed ring 13. The first fixed ring 12 and the second fixed ring 13 are connected by a fixed rod 18 located in the gap between adjacent fan-shaped sliders 14, and the arc-shaped outer wall of the fan-shaped slider 14 rests on the inner wall of the steel support tube 2.

[0056] By arranging the slide bar 26 to slide on the first fixing ring 12 and the second fixing ring 13 , the circumferential position of the sector-shaped slider 14 is limited, so that under the extrusion of the tapered rod 9 , the sector-shaped slider 14 can only slide in the axial direction.

[0057] Example 5:

[0058] On the basis of Example 1, in order to achieve convenient installation of the flange plate 10, the present application also has a connecting plate 27 provided on one side of the upper support plate 16 located at the upper end of the purlin 1, and a pair of front-to-back symmetrical connecting holes 29 are provided on the connecting plate 27. Screws fixedly connected to the purlin 1 are inserted into the connecting holes 29. A through hole 20 is provided in the middle position of the flange plate 10 and the sealing plate 11. One end of the connecting rod 8 is fixedly connected to the spiral tube 7, and the middle section of the connecting rod 8 passes through the flange plate 10 and the sealing plate 11 in sequence along the through hole 20. A threaded inner hole 23 is provided on the stepped column 22, and the fastening screw 25 passes through the sealing plate 11 and is threadedly installed in the threaded inner hole 23.

[0059] The through hole 20 is provided to realize the through extension of the connecting rod 8 , and the flange plate 10 is further conveniently installed by utilizing the cooperation between the threaded inner hole 23 and the fastening screw 25 .

[0060] A construction process for implementing the aforementioned subway station steel support connected hanging plate comprises the following steps:

[0061] Install the screw tube 7 and screw the screw tube 7 onto the stud 6;

[0062] Install the flange plate 10. Select a flange plate with an appropriate outer diameter based on the size of the steel support pipe 2. Insert the flange plate 10 along the positioning socket 21 onto the stepped surface of the column 15 and the stepped column 22 to achieve pre-installation. Insert the sealing plate 11 and tighten the screws 25 to achieve a squeeze-type fixed installation of the flange plate 10.

[0063] Install the tapered rod 9 by inserting it between the sector sliders 14 and rotating the end of the connecting rod 8 with the end bearing of the tapered rod 9;

[0064] To install the support plates, insert the lower support plate 5 and the upper support plate 16 along the slide groove 4 and clamp them on the flange plate 10 through the clamping frame 28. Insert the steel support tube 2 so that the fan-shaped slider 14 extends into the inner cavity of the steel support tube 2. Use the connecting bolts 17 to achieve a fixed connection between the end of the steel support tube 2, the lower support plate 5, the upper support plate 16 and the flange plate 10.

[0065] The rotation of the screw 7 on the stud 6 causes the tapered rod 9 to advance, thereby increasing the inner diameter of the tapered rod 9 in the sector slider 14, driving the sector slider 14 to slide outward. As the advancement continues, the six groups of sector sliders 14 distributed in a circumferential array are pressed against the arc inner wall of the steel support tube 2. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A subway station steel support joint type hanging plate, characterized by: The one-piece hanging plate includes: A hanging plate (3), wherein the upper and lower ends of the hanging plate (3) are respectively slidably connected with a lower support plate (5) and an upper support plate (16), one side of the hanging plate (3) is fixed to the surrounding purlin (1) through the upper support plate (16), a stud (6) is provided in the middle of the other side of the hanging plate (3), and the outer wall of the stud (6) is provided with four groups of columns (15) distributed in a circumferential array, and the ends of the columns (15) are provided with stepped columns (22); A flange plate (10), wherein the outer edge of the flange plate (10) is provided with four groups of mounting holes (19) distributed in a circumferential array, and the flange plate (10) is provided with positioning holes (21) corresponding one to one with the columns (15), the positioning holes (21) are sleeved on the step columns (22), and the side surface of the flange plate (10) is pressed onto the step surface between the column (15) and the step column (22), and the lower support plate (5) and the upper support plate (16) are clamped and fixed at the upper and lower ends of the flange plate (10); A sealing plate (11), wherein the sealing plate (11) is fixed to the end face of the stepped column (22) by means of a fastening screw (25), one side of the sealing plate (11) is attached to the flange plate (10), and the other side of the sealing plate (11) is provided with four groups of fixing rods (18) distributed in a circumferential array, the ends of the fixing rods (18) are connected to a pair of first fixing rings (12) and second fixing rings (13) distributed in parallel, six groups of fan-shaped sliders (14) distributed in a circumferential array are slidably inserted in the gap between the first fixing rings (12) and the second fixing rings (13), a tapered rod (9) is inserted in the middle of the six groups of fan-shaped sliders (14), a connecting rod (8) is provided at the other end of the tapered rod (9), the connecting rod (8) and the tapered rod (9) are rotatably connected by a bearing, the other end of the connecting rod (8) passes through the flange plate (10) and the sealing plate (11), and the end of the connecting rod (8) is provided with a screw tube (7) that is threaded and rotatably sleeved on the stud (6); A steel support tube (2), the end of which is fixedly connected to the flange plate (10), the lower support plate (5) and the upper support plate (16) by means of connecting bolts (17) inserted into the mounting holes (19).

2. The subway station steel support integrated cladding according to claim 1, characterized in that: A slide groove (4) is vertically provided in the middle of the upper and lower ends of the hanging plate (3), and a slide plate (30) is provided on both the lower support plate (5) and the upper support plate (16). The slide plate (30) is slidably inserted into the slide groove (4), and the slide plate (30) is fixed to the side wall of the hanging plate (3) by through bolts.

3. The subway station steel support integrated cladding according to claim 2, characterized in that: The upper support plate (16) and the lower support plate (5) are both provided with a clamping frame (28) corresponding to the flange plate (10), the thickness of the clamping frame (28) is the same as that of the flange plate (10), and the clamping frame (28) is provided with a through hole (24) that coincides with the mounting hole (19), and the connecting bolt (17) is inserted through the through hole (24) and the mounting hole (19).

4. The subway station steel support integrated cladding according to claim 3, characterized in that: The sealing plate (11) is pressed onto the end face of the steel support tube (2), the outer diameter of the sealing plate (11) is smaller than the flange plate (10), and one side of the clamping frame (28) is inserted into the gap formed on the outer side of the sealing plate (11).

5. The subway station steel support integrated cladding according to claim 4, characterized in that: The left and right end surfaces of the sector-shaped slider (14) are provided with slide bars (26), and a pair of the slide bars (26) distributed on the left and right are slidably inserted into the first fixing ring (12) and the second fixing ring (13). The first fixing ring (12) and the second fixing ring (13) are connected by a fixing rod (18) located in the gap between adjacent sector-shaped sliders (14), and the arc-shaped outer wall of the sector-shaped slider (14) is against the inner wall of the steel support tube (2).

6. The subway station steel support integrated cladding according to claim 5, characterized in that: The upper supporting plate (16) is provided with a connecting plate (27) on one side of the upper end of the surrounding purlin (1), and the connecting plate (27) is provided with a pair of front-to-back symmetrical connecting holes (29), and screws fixedly connected to the surrounding purlin (1) are inserted into the connecting holes (29).

7. The subway station steel support integrated cladding according to claim 6, characterized in that: A through hole (20) is provided in the middle of the flange plate (10) and the sealing plate (11), one end of the connecting rod (8) is fixedly connected to the spiral tube (7), and the middle section of the connecting rod (8) passes through the flange plate (10) and the sealing plate (11) in sequence along the through hole (20).

8. The subway station steel support integrated cladding according to claim 7, characterized in that: A threaded inner hole (23) is provided on the stepped column (22), and the fastening screw (25) passes through the sealing plate (11) and is threadably mounted in the threaded inner hole (23).

9. A construction process for the steel-supported one-piece cladding for a subway station according to claim 8, characterized in that: The construction process comprises the following steps: Install the screw tube (7) and rotate the screw tube (7) to install it on the stud (6); Install the flange plate (10). Select a flange plate with a suitable outer diameter according to the size of the steel support pipe (2). Insert the flange plate (10) along the positioning socket (21) onto the stepped surface of the column (15) and the stepped column (22) to achieve pre-installation. Implement the extrusion-type fixed installation of the flange plate (10) by inserting the sealing plate (11) and the fastening screws (25). The tapered rod (9) is installed by inserting the tapered rod (9) between the sector sliders (14), and rotating the end of the connecting rod (8) and the end face bearing of the tapered rod (9); The support plate is installed by plugging the lower support plate (5) and the upper support plate (16) along the slide groove (4), clamping them on the flange plate (10) through the clamping frame (28), plugging the steel support tube (2) so that the fan-shaped slider (14) extends into the inner cavity of the steel support tube (2), and achieving fixed connection between the end of the steel support tube (2), the lower support plate (5), the upper support plate (16) and the flange plate (10) through the connecting bolts (17); The rotation of the screw tube (7) on the stud (6) causes the conical rod (9) to advance, thereby increasing the inner diameter of the conical rod (9) in the fan-shaped slider (14), driving the fan-shaped slider (14) to slide outward. As the advancement continues, the six groups of fan-shaped sliders (14) distributed in a circular array are pressed against the inner wall of the arc of the steel support tube (2).

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