Hoistable prefabricated shear wall and hoisting tool

Abstract

This application relates to a hoistable precast shear wall, comprising a wall body with four connecting rods pre-embedded within it. These four connecting rods are located along the four sides of the wall body, parallel to each other in pairs. Multiple hangers are connected to the connecting rods. One end of each hanger is rotatably connected to a connecting rod, and the other end is equipped with a lifting ring. The wall body has multiple rotating grooves perpendicular to the connecting rods at each connecting rod location. Each rotating groove corresponds to a hanger, with one end connected to the connecting rod and the other end located at the edge of the wall body adjacent to that connecting rod. The length of each hanger is not less than the length of the rotating groove. The lifting rings are of male and female types. One type of lifting ring is provided on each connecting rod, while the types of lifting rings on two parallel connecting rods are different, with the male and female ends fitting together. The use of hanging rods and lifting rings facilitates the hoisting and transportation of the wall body. The two types of lifting rings allow for easy insertion, also facilitating the splicing of walls without the need for later removal, making it convenient and easy to use.

Description

Technical Field

[0001] This application relates to the technical field of building structures, and in particular to a hoistable precast shear wall and hoisting tools. Background Technology

[0002] Shear walls are the walls in buildings or structures that primarily bear horizontal loads and vertical loads (gravity) caused by wind loads or earthquakes. Prefabricated shear wall structures have advantages such as saving labor costs, reducing noise and dust pollution at construction sites, shortening construction periods, better product quality control, high production efficiency, and high material utilization, and are widely used in the construction industry.

[0003] The relevant technology can be found in Chinese Patent Publication No. CN110593417A, which discloses a prefabricated shear wall, which includes a wall unit, an adjustable connector, and an energy-dissipating component. The wall unit includes a shear wall and a first embedded part, which is located at one end of the shear wall in the height direction. The adjustable connector is connected to the end of the shear wall away from the first embedded part. The energy-dissipating component is detachably connected to the adjustable connector and extends to the side of the wall unit connected to it away from the first embedded part.

[0004] Currently, prefabricated shear walls are installed by hoisting. During hoisting, the method involves either binding and securing the wall around its perimeter, or creating hoisting points by damaging the wall structure and then filling the gaps with cement after installation. Both methods are cumbersome, inconvenient, and affect the construction progress. Summary of the Invention

[0005] To simplify operation and ensure construction period, this application provides a hoistable precast shear wall and hoisting tools.

[0006] One of the objectives of this application is to provide a hoistable precast shear wall, employing the following technical solution: A suspended precast shear wall includes a wall body with four connecting rods embedded within it. These four connecting rods are located along the four sides of the wall body, parallel to each other in pairs. Multiple hanging rods are connected to the connecting rods. One end of each hanging rod is rotatably connected to a connecting rod, and the other end is equipped with a hanging ring. The wall body has multiple rotating grooves perpendicular to the connecting rods at the connecting rod locations. Each rotating groove corresponds to a hanging rod, with one end connected to the connecting rod and the other end located at the edge of the wall body adjacent to the connecting rod. The length of each hanging rod is not less than the length of the rotating groove. The hanging rings are divided into male and female heads. One type of hanging ring is provided on the same connecting rod, while the hanging rings on two parallel connecting rods are of different types. The male and female heads are compatible and interlock.

[0007] By adopting the above technical solution, the lifting rod is rotatably connected to the connecting rod. Before lifting, the lifting rod is rotated so that it is perpendicular to the wall, with the lifting ring facing upwards. Construction workers can then connect the hook on the lifting tool to the lifting ring, thereby lifting and transporting the wall. After reaching the transport position, the construction workers lower the wall and rotate the lifting rod into the rotating groove. At this point, the lifting rod is no longer perpendicular to the wall, and the wall surface can be used normally. All lifting rings are located at the ends of the wall, with the male end on one side and the female end on the other. When splicing two wall sections together, the male and female ends are inserted face-to-face to increase the connection strength between the two wall sections. Then, concrete is filled between the two wall sections to seal them. With the lifting rod and lifting ring configuration of this application, on the one hand, the lifting rings facilitate the lifting and transportation of the wall, and construction workers do not need to perform on-site drilling or other operations; they can directly lift the wall. On the other hand, the lifting rings come in two types that can be plugged in, which facilitates the splicing of walls, improves strength, does not affect the normal use of the wall, and does not need to be removed later. They are convenient to use and easy to operate.

[0008] Optionally, the four sides of the wall are divided into two male sides and two female sides, with the male sides facing each other. The end of the female side is provided with an outwardly extending connecting edge. The end of the male side is provided with a connecting groove that matches the connecting edge. The depth of the connecting groove is equal to the thickness of the connecting edge. A notch is provided on the connecting edge to avoid the lifting ring. The length of the connecting edge is greater than the diameter of the lifting ring.

[0009] By adopting the above technical solution, when connecting walls, the male and female sides are inserted opposite each other, and the connecting edge is inserted into the connecting groove. The connection point between the walls is covered by the connecting edge, as is the connection point between the male and female ends. Pouring concrete into the connecting edge will fix the connection between the walls. The connecting edge can cover the lifting ring, improving the aesthetics of the connected walls. Furthermore, during concrete pouring, the connecting edge can prevent concrete overflow, reducing the workload of construction workers and facilitating operation.

[0010] Optionally, all the hangers on the same connecting rod are connected to a common connecting plate. When the hanger is located in the rotating groove, the connecting plate is parallel to and in contact with the wall.

[0011] By adopting the above technical solution, all the booms are connected by a connecting plate, and all the booms rotate synchronously, making operation convenient.

[0012] Optionally, the connecting rod has a plurality of threaded holes corresponding to the lifting rod, and the lifting rod has a fixing hole that matches the threaded hole. When the lifting rod is located in the rotating groove, the fixing hole and the threaded hole are aligned, and a fixing bolt that is threadedly connected to the threaded hole passes through the fixing hole.

[0013] By adopting the above technical solution, the hanger rod is embedded in the rotating ring and fixed by fixing bolts to prevent the hanger rod from jumping and affecting the stability of the connection between the walls.

[0014] Optionally, the female connector includes two parallel rings with a slot between them for inserting the male connector, and the male connector includes a ring for inserting into the slot.

[0015] By adopting the above technical solution, the male and female connectors are connected by plugging in, which is convenient to operate and easy to use.

[0016] Optionally, it also includes a plug for connecting the walls together, the diameter of which is equal to the inner diameter of the ring.

[0017] By adopting the above technical solution, when connecting walls, the male and female connectors are inserted, and the insertion rod passes through the center of all rings, thereby locking the male and female connectors together and preventing them from separating, thus further improving the connection stability between walls.

[0018] Another objective of this application is to provide a hoisting tool, employing the following technical solution: A hoisting tool for hoisting a type of hoistable precast shear wall, comprising two parallel support rods, at least one hoisting ring at the upper end of each support rod, a hoisting rope connected to the hoisting ring, one end of the hoisting rope connected to the hoisting ring and the other end connected to a hanging ring, all hoisting ropes connected to a single hanging ring, and several hoisting chains connected to the lower end of each support rod, the lower end of each hoisting chain connected to a hook for hooking the hoisting ring.

[0019] By adopting the above technical solution, the hanging ring is connected to the crane, and the hook is connected to the wall. The crane applies force to the support rod through the lifting rope. When the lifting rope tilts, the support rod receives an upward tension. Meanwhile, the lifting chain below the support rod hangs naturally under the action of gravity. The force exerted on the wall is basically a vertical tension, with no horizontal force. Therefore, the interior of the wall will not be compressed, and the wall is not easily damaged.

[0020] Optionally, the support rod has a slide rail parallel to the support rod, and the upper end of the lifting chain is fixed with a slider that is slidably connected in the slide rail. The slide rail has several locking holes, and the slider is threaded with locking bolts that are connected to the locking holes.

[0021] By adopting the above technical solution, the lifting chain can slide and change position according to the position of the lifting ring on the wall, thereby ensuring that the tension of the lifting chain is vertically upward and ensuring the stability and safety of the wall during lifting.

[0022] Optionally, multiple stabilizing rods perpendicular to the support rods are inserted between the two support rods. Several adjusting holes are opened on the stabilizing rods along their length. Adjusting bolts that are adapted to the adjusting holes are inserted on the support rods. The adjusting bolts are threadedly connected to the adjusting holes.

[0023] By adopting the above technical solution, the support rods are connected to each other by a stabilizing rod, which improves the overall stability of the device. The distance between the support rods can be adjusted by adjusting the holes, so that walls of different sizes can be lifted, making it convenient to use.

[0024] In summary, this application includes at least one of the following beneficial technical effects: The use of lifting rods and rings in this application offers several advantages. First, the rings facilitate the hoisting and transportation of the wall structure, eliminating the need for on-site drilling and other operations by construction workers; the lifting can proceed directly. Second, the two types of rings that can be interlocked facilitate the splicing of walls, increasing strength without affecting the normal use of the wall structure. They also eliminate the need for later removal, making them convenient and easy to use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a hoistable precast shear wall in one embodiment.

[0026] Figure 2 This is a schematic diagram of the connection between the connecting rod and the wall in the embodiment.

[0027] Figure 3 This is a schematic diagram of the connection between the connecting rod and the hanger in the embodiment.

[0028] Figure 4 This is a schematic diagram of the connection between walls in the embodiment.

[0029] Figure 5 This is a schematic diagram of the connection between the insertion rod and the lifting ring in the embodiment.

[0030] Figure 6 This is a schematic diagram of the overall structure of a hoisting tool in one embodiment.

[0031] Figure 7 This is a schematic diagram of the connection between the lifting chain and the support rod in the embodiment.

[0032] Explanation of reference numerals in the attached drawings: 1. Wall; 11. Rotating groove; 12. Male edge; 13. Female edge; 14. Connecting edge; 141. Notch; 15. Connecting groove; 2. Connecting rod; 21. Threaded hole; 3. Hanging rod; 31. Connecting plate; 32. Fixing hole; 33. Fixing bolt; 34. Rotary ring; 4. Hanging ring; 41. Male head; 42. Female head; 43. Ring body; 44. Slot; 5. Insert rod; 6. Support rod; 61. Lifting ring; 62. Lifting rope; 63. Hanging ring; 64. Lifting chain; 641. Sliding block; 642. Locking bolt; 65. Hook; 66. Slide rail; 661. Locking hole; 67. Adjusting bolt; 7. Stabilizing rod; 71. Adjusting hole. Detailed Implementation

[0033] The present application will be further described in detail below with reference to all the accompanying drawings.

[0034] This application discloses a hoistable precast shear wall, referring to... Figure 1 and Figure 2 The structure includes wall 1, which is made of cast concrete. Reinforcing steel bars and four connecting rods 2 are embedded within wall 1. The four connecting rods 2 are parallel to each other in pairs, and the reinforcing steel bars are fixedly connected to the connecting rods 2. Wall 1 has a flat, rectangular structure. The four connecting rods 2 are located at the four sides of wall 1, with a distance between the connecting rods 2 and the edges of wall 1.

[0035] Reference Figure 1 and Figure 3 One side of the wall 1 is called the tension surface. Several hangers 3 are rotatably connected to the connecting rod 2 along its length. Each hanger 3 includes a rotating ring 34 at its end, with an opening. The rotating ring 34 is rotatably connected to the connecting rod 2. A hanging ring 4 is located at the end of the hanger 3 away from the rotating ring 34. Several rotating grooves 11 are formed on the tension surface, divided into four groups. Each group of rotating grooves 11 corresponds to one connecting rod 2, and the rotating grooves 11 are perpendicular to the corresponding connecting rod 2, corresponding one-to-one with the hangers 3 on that connecting rod 2. The hangers 3 can be embedded in the corresponding rotating grooves 11. That is, the hangers 3 have two states: when the hanger 3 is perpendicular to the wall 1, the hanging ring 4 is located directly above the tension surface, facilitating lifting. When the hanger 3 is embedded in the rotating groove 11, the hanger 3 is submerged in the wall 1, and the hanging ring 4 is located at the end of the tension surface.

[0036] Reference Figure 1 and Figure 2The rotating groove 11 is located between the connecting rod 2 and the edge of the wall 1. One end of the rotating groove 11 is connected to the connecting rod 2, and the other end is located at the edge of the wall 1 adjacent to the connecting rod 2. The length of the lifting rod 3 is not less than the length of the rotating groove 11 to ensure that the lifting rod 3 can be embedded in the rotating groove 11 when rotating. The lifting ring 4 extends from the end of the rotating groove 11 away from the connecting rod 2. When hoisting the wall 1, the wall 1 is laid flat, and the lifting rod 3 is rotated so that the lifting rod 3 is perpendicular to the wall 1, with the lifting ring 4 facing vertically upward and connected to the lifting device, to lift the wall 1. After being lifted to the corresponding position, the wall 1 is removed. The lifting rod 3 is rotated so that the lifting rod 3 is embedded in the rotating groove 11 to ensure the flatness of the surface of the wall 1 and not affect the normal use of the wall 1.

[0037] Reference Figure 1 and Figure 2 A connecting plate 31 is connected to one side of the hanger 3. All hangers 3 on the same connecting rod 2 are connected to the same connecting plate 31. When the hanger 3 is embedded in the rotating groove 11, the connecting plate 31 is in close contact with the wall 1 and is parallel to the wall 1. Moreover, the hanging rings 4 on the same connecting rod 2 can rotate synchronously, eliminating the inconvenience of individual adjustment.

[0038] Reference Figure 1 and Figure 3 The rotating ring 34 has a fixing hole 32, and the connecting rod 2 has several threaded holes 21. The threaded holes 21 correspond one-to-one with the hanging rod 3. When the hanging rod 3 is inserted into the rotating groove 11, the fixing hole 32 and the threaded hole 21 are aligned. At this time, the fixing bolt 33 is inserted into the fixing hole 32. The fixing bolt 33 passes through the fixing hole 32 and is threadedly connected to the threaded hole 21, thereby fixing the hanging rod 3 and preventing the hanging rod 3 from rotating on its own, which would affect the normal use of the wall 1.

[0039] Reference Figure 1 and Figure 2 After wall 1 is hoisted to the appropriate position, it is then assembled. To facilitate the connection and assembly between wall 1 sections, the lifting ring 4 is divided into two types: a male head 41 and a female head 42. The female head 42 includes two parallel rings 43, with a slot 44 between the two rings 43 for inserting the male head 41. The male head 41 includes a ring 43 for inserting into the slot 44. During the assembly of wall 1 sections, the lifting rod 3 is embedded in the rotating groove 11, and the lifting ring 4 is located at the end of the wall 1 section. The two wall sections 1 are then interlocked, with the male head 41 on one wall section aligning with the female head 42 on the other wall section. The lifting ring 4 has two uses: it can be used for lifting wall 1 sections and for connecting wall 1 sections, making it convenient to use.

[0040] Reference Figure 2Each connecting rod 2 has a type of lifting ring 4, meaning that all the lifting rings 4 on a connecting rod 2 are either male heads 41 or all are female heads 42. Furthermore, the types of lifting rings 4 on two parallel connecting rods 2 are different, and the lifting rings 4 on the two parallel connecting rods 2 correspond one-to-one, are of equal height, and can be inserted into each other. That is, if all the lifting rings 4 on one of the two parallel connecting rods 2 are male heads 41, then all the lifting rings 4 on the other connecting rod 2 will be female heads 42. In this way, when wall panels 1 are spliced ​​together, the male heads 41 and female heads 42 can be smoothly inserted.

[0041] Reference Figure 1 and Figure 2 The wall 1 has four sides, divided into two male sides 12 and two female sides 13. The male sides 12 and female sides 13 are opposite each other and parallel to each other. The end of the female side 13 has an integrally formed outwardly extending connecting edge 14, and the wall 1 has two connecting edges 14 near the female side 13. The end of the male side 12 has a connecting groove 15 that matches the connecting edge 14, and the depth of the connecting groove 15 is equal to the thickness of the connecting edge 14. When the walls 1 are joined together, the male side 12 of one wall 1 is inserted into the female side 13 of another wall 1, with the connecting edge 14 inserted into the connecting groove 15. The connecting edge 14 covers and conceals the joint between the walls 1, improving the overall flatness and aesthetics.

[0042] Reference Figure 1 and Figure 2 The length of the connecting edge 14 is greater than the diameter of the lifting ring 4, and a notch 141 is provided on the connecting edge 14 to avoid the lifting ring 4. The lifting rod 3 is embedded in the rotating groove 11, and the lifting ring 4 rotates from the notch 141 between the two connecting edges 14. The wall 1 is inserted into the wall 1, and the connecting edge 14 covers the connection between the lifting rings 4.

[0043] Reference Figure 4 and Figure 5 A rod 5 is installed between wall sections 1, with the diameter of the rod 5 equal to the inner diameter of the ring 43. When wall sections 1 are connected, the lifting rings 4 at the ends of the two wall sections 1 are interlocked. The rod 5 is then inserted into the lifting ring 4 at the connection point between wall sections 1. The rod 5 passes through all the lifting rings 4, thus connecting wall sections 1 to wall sections 1, preventing them from loosening, and increasing the connection strength. The inserted rod 5 also acts as a keel, thereby enhancing the overall structural strength of wall sections 1. Finally, concrete is poured into the connection point between wall sections 1 to fill and seal it.

[0044] The implementation principle of a hoistable precast shear wall according to an embodiment of this application is as follows: When hoisting wall 1, wall 1 is laid flat, and the hoisting rod 3 is rotated so that the hoisting rod 3 is perpendicular to wall 1. The hook 65 on the hoisting device is connected to the lifting ring 4, thereby hoisting wall 1. After hoisting wall 1 to the corresponding position, the hook 65 is removed, and wall 1 can be used normally, which is convenient. When splicing wall 1, the hoisting rod 3 is rotated into the rotating groove 11, and the lifting ring 4 is located at the end of wall 1. Wall 1 is inserted into wall 1, the male side 12 is inserted into the female side 13, the male head 41 is inserted into the female head 42, and then the insertion rod 5 is inserted into the lifting ring 4 for fixation. Finally, the connection between wall 1 and wall 1 is filled with concrete.

[0045] This application also discloses a hoisting tool, as shown in the embodiments. Figure 6 The system includes two parallel support rods 6 and two stabilizing rods 7. Each end of the support rod 6 has a lifting ring 61 on its upper surface, with a lifting rope 62 connected to each ring. The end of each rope 62 away from the ring is connected to a hanging ring 63, with four ropes 62 sharing a single hanging ring 63. The hanging ring 63 is used to connect to the hook of the crane. Multiple lifting chains 64 are connected to the lower end of the support rod 6, with hooks 65 fixed to their lower ends. The hanging rings 63 are connected to the crane, and the hooks 65 are used to lift heavy objects. The crane applies force to the support rod 6 through the lifting ropes 62. When the lifting ropes 62 tilt, the support rod 6 receives an upward pulling force. Meanwhile, the lifting chains 64 below the support rod 6 hang naturally under gravity, so the force applied to the heavy object is primarily a vertical pulling force, with no horizontal force. This prevents internal compression of the heavy object and reduces the risk of damage.

[0046] Reference Figure 7 The support rod 6 has a slide rail 66 parallel to the support rod 6. The upper end of the lifting chain 64 is fixed with a slider 641 that is slidably connected in the slide rail 66. The lifting chain 64 can slide along the slide rail 66 to adjust the position of the lifting chain 64 to meet the lifting requirements of different weights.

[0047] Reference Figure 7 The slide rail 66 has several locking holes 661, and the slider 641 is fitted with locking bolts 642 that are threaded into the locking holes 661. After the lifting chain 64 is adjusted to the corresponding position, the lifting chain 64 is locked and fixed by the locking bolts 642 to prevent the lifting chain 64 from slipping and affecting the stability of the lifting.

[0048] Reference Figure 6The stabilizer bar 7 is perpendicular to the support bar 6. Support holes are provided at both ends of the support bar 6, and the stabilizer bar 7 passes through these holes. An adjusting bolt 67 passes through the upper end of the support bar 6. Several adjusting holes 71 are provided along the length of the upper surface of the stabilizer bar 7, and the adjusting bolt 67 is threaded into these holes 71. The stabilizer bar 7 is inserted into the support bar 6, and the adjusting bolt 67 is screwed into the adjusting holes 71 to fix the support bar 6 and the stabilizer bar 7, thereby improving the overall stability of the device. Furthermore, the large number of adjusting holes 71 on the stabilizer bar 7 allows construction personnel to adjust the position of the support bar 6, thus changing its position and enabling the lifting of heavy objects of different sizes. This design has a wide range of applications.

[0049] The implementation principle of a lifting tool according to this application embodiment is as follows: Construction personnel adjust the position of the support rod 6 according to the dimensions of the load and secure it with adjusting bolts 67. The position of the lifting chain 64 is adjusted and locked with locking bolts 642. The hanging ring 63 is connected to the crane, and the hook 65 is connected to the load for lifting.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hoistable precast shear wall, comprising a wall body (1), characterized in that: Four connecting rods (2) are pre-embedded in the wall (1). The four connecting rods (2) are located on the four sides of the wall (1) and are parallel to each other in pairs. Multiple hanging rods (3) are connected to the connecting rods (2). One end of the hanging rod (3) is rotatably connected to the connecting rod (2), and the other end is provided with a hanging ring (4). The wall (1) has multiple rotating grooves (11) perpendicular to the connecting rods (2) at the connecting rods (2). The rotating grooves (11) correspond one-to-one with the hanging rods (3). One end of the rotating groove (11) is connected to the connecting rod (2), and the other end is located on the side of the wall (1) adjacent to the connecting rod (2). The length of the hanging rod (3) is not less than the length of the rotating groove (11). The hanging ring (4) is divided into a male head (41) and a female head (42). A type of hanging ring (4) is provided on the same connecting rod (2). The types of hanging rings (4) on two parallel connecting rods (2) are different. The male head (41) and the female head (42) are compatible and plugged in.

2. A hoistable precast shear wall according to claim 1, characterized in that: The four sides of the wall (1) are divided into two male sides (12) and two female sides (13). The male sides (12) and female sides (13) are directly opposite each other. The end of the female side (13) is provided with an outwardly extending connecting edge (14). The end of the male side (12) is provided with a connecting groove (15) that matches the connecting edge (14). The depth of the connecting groove (15) is equal to the thickness of the connecting edge (14). The connecting edge (14) is provided with a notch (141) for avoiding the lifting ring (4). The length of the connecting edge (14) is greater than the diameter of the lifting ring (4).

3. A hoistable precast shear wall according to claim 1, characterized in that: All the hangers (3) on the same connecting rod (2) are connected to a connecting plate (31). When the hanger (3) is located in the rotating groove (11), the connecting plate (31) is parallel to and in contact with the wall (1).

4. A hoistable precast shear wall according to claim 1, characterized in that: The connecting rod (2) has a plurality of threaded holes (21) corresponding to the lifting rod (3) one by one. The lifting rod (3) has a fixing hole (32) that matches the threaded hole (21). When the lifting rod (3) is located in the rotating groove (11), the fixing hole (32) is directly opposite the threaded hole (21), and a fixing bolt (33) that is threadedly connected to the threaded hole (21) passes through the fixing hole (32).

5. A hoistable precast shear wall according to claim 1, characterized in that: The female head (42) includes two parallel rings (43), with a slot (44) between the two rings (43) for inserting the male head (41), and the male head (41) includes a ring (43) for inserting into the slot (44).

6. A hoistable precast shear wall according to claim 5, characterized in that: It also includes a plug (5) for connecting the wall (1) to the wall (1), the diameter of which is equal to the inner diameter of the ring (43).

7. A lifting tool for lifting a hoistable precast shear wall as described in any one of claims 1-6, characterized in that: It includes two parallel support rods (6), the upper end of the support rod (6) is provided with at least one lifting ring (61), the lifting ring (61) is connected to a lifting rope (62), one end of the lifting rope (62) is connected to the lifting ring (61), and the other end is connected to a hanging ring (63). All the lifting ropes (62) are connected to a hanging ring (63). The lower end of the support rod (6) is connected to several lifting chains (64), and the lower end of the lifting chain (64) is connected to a hook (65) for hooking the lifting ring (4).

8. A hoisting tool according to claim 7, characterized in that: The support rod (6) has a slide rail (66) parallel to the support rod (6), and the upper end of the lifting chain (64) is fixed with a slider (641) slidably connected in the slide rail (66). The slide rail (66) has a plurality of locking holes (661), and the slider (641) is provided with a locking bolt (642) threadedly connected to the locking hole (661).

9. A hoisting tool according to claim 7, characterized in that: Multiple stabilizing rods (7) perpendicular to the support rods (6) are inserted between the two support rods (6). Several adjusting holes (71) are opened on the stabilizing rods (7) along the length direction. Adjusting bolts (67) that are adapted to the adjusting holes (71) are inserted on the support rods (6). The adjusting bolts (67) are threadedly connected to the adjusting holes (71).

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