Transverse comprehensive pipe rack for tunnel portal

Abstract

The utility model provides a tunnel portal transverse comprehensive pipe gallery which comprises the steps of pre-burying of precast blocks of a fixed rail, installation of a plastic formwork trolley, accurate pre-burying of a U-shaped channel, main body construction, dismantling of an early-dismantling plastic formwork, through-wall waterproof construction of a water collecting well and a water drainage pipe, installation of a pipeline and a support and the like. Nuts are embedded in precast blocks of the fixed rails and connected with guide rail bolts, the plastic formwork trolley is divided into an early-dismantled formwork and a late-dismantled formwork, a changing device for mutual conversion of walking and jacking is designed at the bottom of the trolley, a U-shaped channel is finely adjusted up and down and left and right, and when the early-dismantled plastic formwork is dismantled, a hydraulic rod is shrunk to be separated from a concrete side wall and a top plate. The pre-buried steel pipe is pre-buried in a pipe gallery side wall in advance to serve as a drainage pipe through-wall channel, and the corrugated steel pipe is moved and transported to a designated position through the novel support to be installed. The comprehensive pipe gallery drainage device has the advantages of being high in construction efficiency, good in comprehensive pipe gallery drainage effect and high in pipeline installation and positioning precision, and can obtain good technical and economic benefits when being applied to actual engineering.

Description

Technical Field

[0001] The utility model relates to the field of tunnels, in particular to a transverse integrated pipe gallery at the tunnel entrance. Background Art

[0002] Most of the integrated pipe galleries are constructed by open excavation. The construction process of using traditional formwork supports is numerous and the construction period is long. While using steel formwork has a high cost, and due to its large weight and difficulty in movement, the formwork and formwork system are particularly important for the construction quality of the integrated pipe gallery. For the optimization of the formwork system, the convenience of construction, formwork turnover rate, construction efficiency and cost need to be further considered. At the same time, the integrated pipe gallery drains through the setting of drainage ditches and catch basins. Its drain pipes have the situation of passing through the wall, so waterproof treatment of the integrated pipe gallery is required, and the timeliness of drainage should be ensured. In addition, the positioning accuracy and installation efficiency of cable brackets, pipe brackets, etc. also become construction problems.

[0003] In summary, at present, for the construction of the transverse integrated pipe gallery at the tunnel entrance, it is necessary to consider from aspects such as the formwork system, drainage, waterproofing, bracket positioning, and bracket installation, and a transverse integrated pipe gallery at the tunnel entrance is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a transverse integrated pipe gallery at the tunnel entrance that solves the above technical problems.

[0005] To solve the above technical problems, the utility model provides a transverse integrated pipe gallery at the tunnel entrance, which includes a pipe gallery bottom plate, precast blocks for fixing guide rails, and a plastic formwork trolley. Nuts are embedded in the precast blocks. The plastic formwork trolley is formed by sequentially installing an early demolition support frame, late demolition support rods, pulleys, and a flip-up top support chassis. The two sides of the late demolition support rods are respectively connected to vertical support rods by transverse connecting rods to form a formwork support. The formwork support is formed integrally and is connected to the support fasteners on the half-frame support rods.

[0006] Further, the early demolition support frame includes vertical support rods, half-frame support rods, hydraulic rods, and diagonal braces. The vertical support rods are fixed on the half-frame support rods. The hydraulic rods are horizontally fixed between the vertical support rods and the half-frame support rods. Diagonal braces are arranged between the lower part of the hydraulic rods and the vertical support rods.

[0007] Further, sleeves are connected to the bottoms of the late demolition support rods, vertical support rods, and half-frame support rods. The cross bar of the U-shaped support rod is embedded in the sleeve. The open end of the U-shaped support rod is connected to the bottom plate so that the convex lock buckle extends out from the small hole of the sleeve. A limit plate is connected to the sleeve and is located inside the U-shaped support rod. The pulley is rotatably connected to the limit plate. The U-shaped support rod, the bottom plate, and the convex lock buckle form a flip-up top support chassis.

[0008] Further, a number of equally spaced pin holes are arranged at intervals on the side of the late-demolition support rod. The vertical support rod is installed at one end of the horizontal connecting rod, and the other end of the horizontal connecting rod is inserted into the pin holes. The top of the late-demolition support rod is connected to a U-shaped top support. Holes are opened on both side plates of the U-shaped top support. Screws are installed on both sides of the main rib. A limiting piece is arranged on the screw. After the screw passes through the hole, it is fixed by a hexagonal nut.

[0009] Further, it also includes a horizontal fixing rod and a U-shaped channel. The two ends of the horizontal fixing rod are installed on the steel bars. A number of anchor rods are distributed at intervals along the length direction of the U-shaped channel. The end of the anchor rod is connected to an extended fixing rod. The extended fixing rod passes through the sliding groove of the horizontal fixing rod, and the end of the extended fixing rod away from the anchor rod is fixed with a nut.

[0010] Further, the end of the anchor rod and the head of the extended fixing rod are connected by a fixing pipe. The tail of the extended fixing rod is sleeved with a nut Ⅰ, extends out from the sliding groove and is sleeved with a nut Ⅱ.

[0011] Further, it also includes a sump. A water pump fixing frame is fixed at the bottom of the sump. The water pump is fixed on the water pump fixing frame. The water pump is connected and installed with one end of a drain pipe. The other end of the drain pipe is connected to a pre-buried steel pipe joint inside the pipe gallery main body. Another drain pipe is connected to the pre-buried steel pipe joint outside the pipe gallery main body, so that the water pump discharges the water in the sump along the drain pipe to the outside.

[0012] Further, sealing rings are arranged at both ends of the pre-buried steel pipe, and a water stop ring is arranged in the middle; a sealing paste is laid on the outer periphery of the sealing ring.

[0013] Further, guide rails are installed along a number of precast blocks. There are sliding rails on the guide rails. Corrugations are arranged on the concave surface of the new type of support. Sliders are arranged at the bottom. The sliders move and are embedded in the sliding rails. The corrugated steel pipe is placed on the concave surface of the new type of support.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model uses a plastic formwork trolley for the construction of the utility tunnel, and uses the changing device of walking and jacking to control the trolley construction, effectively improving the construction efficiency of the utility tunnel.

[0016] 2. The present utility model adjusts the position of the U-shaped channel through the U-shaped channel fixing device, adjusts the horizontal fixing rod vertically along the steel bars, and moves the extended fixing rod left and right in the sliding groove, improving the installation accuracy of the U-shaped channel.

[0017] 3. The present utility model uses precast blocks to be pre-buried on the bottom slab of the tunnel. Through the positioning of the precast blocks and the installation of guide rails, and further through the new type of support to transport and install the corrugated steel pipe, improving the installation accuracy and speed of the corrugated steel pipe.

[0018] 4. The utility model uses embedded steel pipes as the wall-piercing channels for the drain pipes, solves the water-stop problem of the wall-piercing pipes through the water-stop rings and sealing rings of the embedded steel pipes, and at the same time arranges water level sensors to monitor and guide the water pump to pump water in real time, improving the drainage effect of the utility tunnel. Description of the Drawings

[0019] Figure 1 is the structure diagram of the plastic formwork trolley;

[0020] Figure 2 is the elevation view of the trolley walking and jacking change device;

[0021] Figure 3 is the enlarged view of A;

[0022] Figure 4 is the enlarged view of B;

[0023] Figure 5 is the front view of the U-shaped channel fixing;

[0024] Figure 6 is the side view of the U-shaped channel fixing;

[0025] Figure 7 is the cross-sectional view of the precast block embedding;

[0026] Figure 8 is the schematic diagram of the corrugated steel pipe installation and positioning;

[0027] Figure 9 is the schematic diagram of the overall layout structure of the sump;

[0028] Figure 10 is the structure diagram of the sump;

[0029] Figure 11 is the cross-sectional view of the embedded steel pipe installation.

[0030] In the figure, 1 is the early demolition support frame; 2 is the semi-frame support rod; 3 is the vertical support rod; 4 is the late demolition support rod; 5 is the transverse connecting rod; 6 is the support fastener; 7 is the late demolition plastic formwork; 8 is the early demolition plastic formwork; 9 is the hydraulic rod; 10 is the diagonal brace; 11 is the reversible jack chassis; 12 is the pulley; 13 is the sleeve; 14 is the U-shaped support rod; 15 is the convex lock; 16 is the bottom plate; 17 is the limit plate; 18 is the steel bar; 19 is the U-shaped channel; 20 is the transverse fixing rod; 21 is the sliding groove; 22 is the anchor rod; 23 is the nut I; 24 is the nut II; 25 is the fixed pipe; 26 is the extended fixing rod; 27 is the pin hole; 28 is the precast block; 29 is the guide rail; 30 is the slide rail; 31 is the slider; 32 is the bolt; 33 is the nut; 34 is the pipe gallery bottom plate; 35 is the new type of support; 36 is the corrugated steel pipe; 37 is the sump; 38 is the water pump; 39 is the water pipe; 40 is the embedded steel pipe; 41 is the water pump fixing frame; 42 is the fixing frame; 43 is the water level sensor; 44 is the cast iron cover plate; 45 is the side wall; 46 is the water stop ring; 47 is the joint; 48 is the sealant; 49 is the sealing ring; 50 is the screw rod; 51 is the U-shaped top support; 52 is the limit piece; 53 is the hexagonal nut; 54 is the main joist. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0032] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 invention 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. Therefore, the above terms should not be construed as limiting the present invention.

[0033] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of one element can be one, and in other embodiments, the number of this element can be multiple. The term "one" should not be construed as limiting the quantity.

[0034] As Figures 1-11 described, the present invention provides a transverse integrated pipe gallery at the tunnel entrance, which can be obtained through the following construction steps:

[0035] Step 1: Embedding of precast blocks for fixed tracks

[0036] Pre-fabricate square precast blocks 28 with the same thickness as the bottom slab 34 of the utility tunnel. Embed nuts 33 at the four corners of the precast blocks 28 and seal them with plastic film to prevent concrete from blocking the holes. After the bottom slab 34 of the utility tunnel and the steel bars 18 are tied up, place several precast blocks 28 at the designated positions according to the layout position in advance, and then complete the concrete construction of the bottom slab 34 of the utility tunnel.

[0037] Step 2: Installation of plastic formwork trolley

[0038] Install the early removal support frame 1, late removal support rod 4, pulley 12, and reversible jacking chassis 11 in sequence to form a plastic formwork trolley. Among them, on both sides of the late removal support rod 4, connect the vertical support rods 3 with transverse connecting rods 5 to form a formwork support, and process the formwork support into an integrated unit, and then transport it to the site and connect it with the support fasteners 6 on the half-frame support rod 2.

[0039] Specifically, the early removal support frame 1 includes a vertical support rod 3, a half-frame support rod 2, a hydraulic rod 9, and a diagonal brace 10. The vertical support rod 3 is fixed to the half-frame support rod 2 by means of bolt connection. The hydraulic rod 9 is horizontally fixed between the vertical support rod 3 and the half-frame support rod 2, and a diagonal brace 10 is arranged between the lower part of the hydraulic rod 9 and the vertical support rod 3 to provide support.

[0040] Specifically, welding sleeves 13 are provided at the bottoms of the late removal support rod 4, the vertical support rod 3, and the half-frame support rod 2. The cross bar of the U-shaped support rod 14 is embedded in the sleeve 13 in advance. The open end of the U-shaped support rod 14 is welded to the bottom plate 16, so that the raised lock 15 extends out of the small hole of the sleeve 13, so as to facilitate the positioning of the relative position between the sleeve 13 and the U-shaped support rod 14. The limit plate 17 is welded on the sleeve 13 and is located inside the U-shaped support rod 14. The pulley 12 is rotatably connected to the limit plate 17.

[0041] Among them, the U-shaped support rod 14, the bottom plate 16, and the raised lock 15 form a reversible jacking chassis 11. The cross bar of the U-shaped support rod 14 is in rotational fit with the sleeve 13 and is positioned by the small hole of the sleeve 13 through the raised lock 15 to avoid the situation that the cross bar of the U-shaped support rod 14 rotates by itself. After unlocking the raised lock 15, the U-shaped support rod 14 can be rotated relative to the sleeve 13, and then drive the bottom plate 16 to rotate away from the bottom surface, so that the pulley 12 touches the ground.

[0042] Among them, the raised lock 15 can be telescoped relative to the cross bar of the U-shaped support rod 14, and a spring is arranged at the telescoping position to ensure that the raised lock 15 can protrude and be fixed towards the small hole of the sleeve 13 under the drive of the spring.

[0043] Specifically, a number of equally spaced pin holes 27 are arranged at intervals on the side of the late-demolition support rod 4. The vertical support rod 3 is installed at one end of the horizontal connecting rod 5 by means of bolt connection, and the other end of the horizontal connecting rod 5 is inserted into the pin hole 27.

[0044] Specifically, a U-shaped top support 51 is welded to the top of the late-demolition support rod 4. Holes are opened on both side plates of the U-shaped top support 51. The main rib 54 is pre-installed with a screw rod 50, and a limit piece 52 is welded on the screw rod 50. After the screw rod 50 passes through the hole, it is fixed with a hexagonal nut 53, so that both sides of the connection between the screw rod 50 and the side plate of the U-shaped top support 51 are positioned by the limit piece 52 and the hexagonal nut 53 respectively.

[0045] Among them, the hole is of a U-shaped structure, so that the screw rod 50 can enter the hole from the opening of the U-shaped structure, thereby ensuring the stable positioning of the screw rod.

[0046] Step Three: Precise Embedding of U-shaped Channels

[0047] After the main body steel bars are tied up, both ends of the horizontal fixing rod 20 are installed on the steel bars 18 by means of hoop. A number of anchor rods 22 are distributed at intervals along the length direction of the U-shaped channel 19, and the end of the anchor rod 22 is connected to the extended fixing rod 26. Then, the threaded extended fixing rod 26 is passed through the sliding groove 21 of the horizontal fixing rod 20, and the end of the extended fixing rod 26 away from the anchor rod 22 is fixed with a nut. The height is adjusted by sliding the horizontal fixing rod 20 up and down, and the distance is adjusted by moving the extended fixing rod 26 left and right.

[0048] Specifically, a fixing pipe 25 is used to hoop between the end of the anchor rod 22 and the head of the extended fixing rod 26. The tail of the extended fixing rod 26 is sleeved with a nut Ⅰ 23, then extends out from the sliding groove 21 and is sleeved with a nut Ⅱ 24 and tightened, so that the relative positions of the nut Ⅰ 23 and the nut Ⅱ 24 to the extended fixing rod 26 are positioned.

[0049] Among them, the horizontal fixing rod 20 is connected to the anchor rod 22 through the extended fixing rod 26, so that the horizontal fixing rod 20 and the U-shaped channel 19 form an integral structure. When the horizontal fixing rod 20 moves up and down along the steel bar 18, the integral structure moves up and down synchronously to ensure the accurate position of the U-shaped channel 19.

[0050] Step Four: Main Body Construction and Early Demolition of Plastic Formwork

[0051] The plastic formwork trolley is positioned in place according to the design position, the outer formwork is erected correspondingly, and then concrete is poured. When the concrete reaches the designed strength for form removal, the early-demountable plastic formwork 8 is removed. First, the transverse connecting rod 5 is removed, then the special handle between the late-demountable plastic formwork 7 and the early-demountable plastic formwork 8 is removed. Subsequently, the hydraulic rod 9 is retracted to retract the semi-frame support rod 2, and then the reversible jack chassis 11 is flipped so that the pulley 12 touches the ground, and the plastic formwork trolley is moved out of the construction section. The late-demountable plastic formwork 7 remains fixed in place. Another late-demountable support rod 4 is connected to the early-demountable support frame 1. At the same time, another late-demountable plastic formwork 7 is installed on the top of the late-demountable support rod 4, and both sides of the other late-demountable plastic formwork 7 are connected to the early-demountable plastic formwork 8 to form a new complete plastic formwork trolley, which is moved into the next construction section to continue construction.

[0052] Among them, the outer formwork refers to the top formwork and side formwork located at the top of the plastic formwork trolley, and the outer formwork located on the outer side of the plastic formwork trolley. The late-demountable plastic formwork 7 and the early-demountable plastic formwork 8 together form the inner formwork, so that the inner and outer formworks jointly position the formwork for concrete pouring.

[0053] Step 5: Waterproof construction of the catch pit and the drain pipe passing through the wall

[0054] After the construction of the catch pit 37 is completed, the water pump fixing bracket 41 is fixed at its bottom, the water pump 38 is fixed on the water pump fixing bracket 41, and then the water pump 38 is connected and installed with one end of the drain pipe 39. The other end of the drain pipe 39 is connected to the joint of the embedded steel pipe 40 inside the pipe gallery main body. The joint of the embedded steel pipe 40 outside the pipe gallery main body is connected to another drain pipe 39, so that the water pump 38 discharges the water in the catch pit 37 along the drain pipe 39 to the outside.

[0055] Among them, sealing rings 49 are arranged at both ends of the embedded steel pipe 40, and a water stop ring 46 is arranged in the middle. The embedded steel pipe 40 is fixed at the designed position during the process of tying the steel bars 18 of the pipe gallery main body and is poured together with the main body. After removing the inner and outer formworks, sealant 48 is applied in a circle along the sealing ring 49.

[0056] It is worth mentioning that the drain pipe 39 located inside the catch pit 37 is connected to the inner wall of the catch pit 37 through a number of fixing frames 42, and a water level sensor 43 is arranged on the inner wall of the catch pit 37. The water level height in the catch pit 37 is detected through the water level sensor 43, and the pump stop water level, the pump start water level and the alarm water level are set in sequence. When the accumulated water in the catch pit 37 reaches the pump start water level, the water pump 38 starts to discharge the accumulated water along the drain pipe 39 to the outside. When the accumulated water in the catch pit 37 reaches the pump stop water level, the operation of the water pump 38 stops. When the accumulated water in the catch pit 37 reaches the alarm water level, an alarm is sent to the staff to indicate that the water level is too high.

[0057] Among them, a cast iron cover plate 44 is covered at the opening on the upper side of the catch pit 37.

[0058] Step Six: Installation of Pipes and Supports

[0059] Install guide rails 29 along the embedding positions of several precast blocks 28. The guide rails 29 are provided with slide rails 30. Corrugations are provided on the concave surface of the new support 35, and a slider 31 is provided at the bottom. Move the slider 31 and embed it into the slide rail 30, and then place the corrugated steel pipe 36 on the concave surface of the new support 35. As the new support 35 moves, convey the corrugated steel pipe 36 along the axial direction of the corrugated steel pipe 36. At the same time, install another new support 35, connect one end of another corrugated steel pipe 36 to the corrugated steel pipe 36 on the original new support 35, and slowly convey the connected corrugated steel pipe 36 along the axial direction. Repeat the above steps in sequence until the installation of the corrugated steel pipe 36 is completed.

[0060] Specifically, holes with internal threads are pre-set on the guide rails 29. Align the holes on the guide rails 29 with the holes at the nut 33 on the precast block 28, and then pass the bolt 32 through the holes on the guide rails 29 and screw it into the nut 33 until it is tightened.

[0061] The present utility model is not limited to the above-mentioned optimal implementation manner. Any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to the present application, it falls within the protection scope of the present utility model.

Claims

1. A transverse integrated utility tunnel at the tunnel entrance, characterized in that: It includes a pipe gallery bottom plate (34), a precast block (28) for fixing a guide rail (29), and a plastic formwork trolley. A nut (33) is embedded in the precast block (28). The plastic formwork trolley is formed by sequentially installing an early demolition support frame (1), a late demolition support rod (4), a pulley (12), and a reversible jacking chassis (11). On both sides of the late demolition support rod (4), a transverse connecting rod (5) is used to connect a vertical support rod (3) to form a formwork support. The formwork support is formed integrally and is connected to a support fastener (6) on a half-frame support rod (2).

2. The transverse integrated utility tunnel at the tunnel entrance according to claim 1, wherein: The early demolition support frame (1) includes a vertical support rod (3), a half-frame support rod (2), a hydraulic rod (9), and a diagonal brace (10). The vertical support rod (3) is fixed to the half-frame support rod (2). The hydraulic rod (9) is horizontally fixed between the vertical support rod (3) and the half-frame support rod (2). A diagonal brace (10) is provided between the lower part of the hydraulic rod (9) and the vertical support rod (3).

3. The lateral integrated pipe gallery at the tunnel entrance according to claim 1, characterized in that: A sleeve (13) is connected to the bottom of the late demolition support rod (4), the vertical support rod (3), and the half-frame support rod (2). The cross bar of a U-shaped support rod (14) is embedded in the sleeve (13). The open end of the U-shaped support rod (14) is connected to a bottom plate (16) so that a raised lock (15) extends out of a small hole in the sleeve (13). A limit plate (17) is connected to the sleeve (13) and is located inside the U-shaped support rod (14). The pulley (12) is rotatably connected to the limit plate (17). The U-shaped support rod (14), the bottom plate (16), and the raised lock (15) form a reversible jacking chassis (11).

4. The transverse integrated utility tunnel at the tunnel portal according to claim 1, characterized in that: A number of equally spaced pin holes (27) are arranged at intervals on the side of the late demolition support rod (4). The vertical support rod (3) is installed at one end of the transverse connecting rod (5), and the other end of the transverse connecting rod (5) is inserted into the pin hole (27). The top of the late demolition support rod (4) is connected to a U-shaped top support (51). Holes are provided on both side plates of the U-shaped top support (51). Screws (50) are installed on both sides of a main rib (54). A limit piece (52) is provided on the screw (50). After the screw (50) passes through the hole, it is fixed by a hexagonal nut (53).

5. The lateral integrated pipe gallery at the tunnel entrance according to claim 1, characterized in that: It further includes a transverse fixing rod (20) and a U-shaped channel (19). Both ends of the transverse fixing rod (20) are installed on a steel bar (18). A number of anchor bolts (22) are distributed at intervals along the length direction of the U-shaped channel (19). The end of the anchor bolt (22) is connected to an extended fixing rod (26). The extended fixing rod (26) passes through a sliding slot (21) of the transverse fixing rod (20), and the end of the extended fixing rod (26) away from the anchor bolt (22) is fixed with a nut.

6. The transverse integrated pipe gallery at the tunnel entrance according to claim 5, characterized in that: The end of the anchor bolt (22) is connected to the head of the extended fixing rod (26) through a fixing pipe (25). The tail of the extended fixing rod (26) is sleeved with a nut Ⅰ (23), extends out from the sliding slot (21), and is sleeved with a nut Ⅱ (24).

7. The lateral integrated utility tunnel at the tunnel entrance according to claim 1, wherein: It further includes a sump well (37). A water pump fixing bracket (41) is fixed to the bottom of the sump well (37). A water pump (38) is fixed on the water pump fixing bracket (41). One end of a drain pipe (39) is connected and installed to the water pump (38). The other end of the drain pipe (39) is connected to a joint of a pre-buried steel pipe (40) inside the pipe gallery main body. The joint of the pre-buried steel pipe (40) outside the pipe gallery main body is connected to another drain pipe (39), so that the water pump (38) discharges the water in the sump well (37) outward along the drain pipe (39).

8. The lateral integrated pipe gallery at the tunnel entrance according to claim 7, characterized in that: Sealing rings (49) are arranged at both ends of the pre-buried steel pipe (40), and a water stop ring (46) is arranged in the middle; a sealing paste (48) is laid on the outer circumference of the sealing ring (49).

9. The transverse integrated pipe gallery at the tunnel entrance according to claim 1, characterized in that: A guide rail (29) is installed along a number of precast blocks (28). The guide rail (29) has a slide rail (30). Corrugations are arranged on the concave surface of the new bracket (35), and a slider (31) is arranged at the bottom. The slider (31) moves and is embedded in the slide rail (30). The corrugated steel pipe (36) is placed on the concave surface of the new bracket (35).

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