Deep foundation pit supporting structure in urban complex environment and construction method

Abstract

The invention belongs to the technical field of building construction, and discloses a deep foundation pit supporting structure in an urban complex environment and a construction method. Through cooperation of structures such as the triggering assembly and the first warning assembly, when the position, close to the upper end, of the inner wall of the foundation pit slightly collapses, the bearing plate and the first supporting plate do not form a 90-degree right angle any more, the first supporting plate drives the telescopic end of the telescopic plate to be away from the bearing plate, and a limiting plate is pulled at the same time; the trigger rod presses the locking plate to descend through a groove in the locking plate and is not connected with the positioning plate in a clamped mode any more, the tension spring pulls the positioning plate to extrude air in the corrugated pipe to flow, the two whistles are blown to sound, surrounding workers are warned, and the guide rod is inclined, so that the positioning plate moves while the positioning plate moves, and the positioning plate is prevented from falling off. And the warning plate can be erected through supporting of the guide rods, so that workers are further helped to determine the collapse position, and meanwhile continuous collapse of the foundation pit can be effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and specifically relates to a deep foundation pit support structure and a construction method under a complex urban environment. Background Art

[0002] The construction foundation pit refers to the earth pit excavated at the foundation design location according to the base elevation and foundation plane size. Eventually, the foundation pit will be backfilled with sand, fly ash or foam concrete and other materials to strengthen the foundation strength. However, due to the presence of many pipes in the soil layer in the city, the soil layer around the foundation pit is relatively loose. Therefore, before backfilling, the foundation pit needs to be supported to ensure that the foundation pit will not collapse during backfilling or when workers are working in the foundation pit.

[0003] In the existing technical solutions, the inner wall of the foundation pit is generally reinforced by pile support, soil nail wall support or anchor support. However, without exception, most of the support methods do not indicate the technical solution for warning of landslides. As a result, once a slight landslide occurs on the inner wall of the foundation pit, the workers on the ground cannot discover it in the first time and carry out remedial work. For this reason, we provide deep foundation pit support structure and construction method in complex urban environment. Summary of the invention

[0004] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a deep foundation pit support structure and a construction method in a complex urban environment, which solves the problem that most of the existing support methods do not provide a technical solution for warning of landslides. Once a slight landslide occurs on the inner wall of the foundation pit, the staff on the ground cannot discover it in the first time.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: A deep foundation pit support structure in a complex urban environment includes a foundation pit and a plurality of support structures placed on the top of the foundation pit;

[0006] The support structure comprises a bearing plate placed on the top of the foundation pit, a first support plate is hingedly connected to the side of the bearing plate, a second support plate is slidably connected to the side of the first support plate, and two positioning pins are symmetrically inserted through the top of the bearing plate;

[0007] The deep foundation pit support structure under the complex urban environment also includes a trigger component, a warning component 1 and a warning component 2;

[0008] The trigger assembly comprises a telescopic plate fixed to one side of the supporting plate, the telescopic end of the telescopic plate is hinged with a limit plate which slides horizontally on the top of the bearing plate, the top of the bearing plate is vertically slid with a locking plate, the middle part of the locking plate is provided with a groove, and the limit plate is provided with a trigger rod located in the groove;

[0009] The warning component 1 includes a warning plate hinged to the top of the bearing plate, a positioning plate is slidably installed at the bottom of the warning plate, the positioning plate is connected to the warning plate through a bellows, a support rod is fixed inside the warning plate, the support rod movably passes through the positioning plate and the bellows, a tension spring wound around the outer circumference of the support rod is installed inside the bellows, the side of the positioning plate is hinged to the top of the bearing plate through a guide rod, and the outer circumference of the bellows is respectively connected to two symmetrically arranged whistles;

[0010] The positioning plate and the locking plate are in a clamping connection;

[0011] The warning component 2 includes a base hinged to the bottom of the supporting plate 1, and the top of the base also penetrates two positioning pins, and each of the positioning pins is inserted into the foundation pit.

[0012] Preferably, a notch for placing a whistle is provided on the top of the warning plate, and the sound outlet of the whistle faces upward.

[0013] Preferably, the trigger assembly also includes a spring sheet 1, which is supported on the bottom of the locking plate, and the two sides of the groove on the top of the locking plate are inclined. A limiting groove is respectively provided at both ends of the top of the locking plate, and the limiting groove is semicircular and the inner diameter value is adapted to the outer diameter value of the trigger rod.

[0014] Preferably, the spring sheet always supports the locking plate to rise to a fixed posture, and the contact surfaces of the locking plate and the positioning plate are both frosted.

[0015] Preferably, the second warning component also includes a plastic rod symmetrically hinged to the top of the base, and two guide grooves are respectively provided at both ends of the side surfaces of the second support plate, and the ends of each plastic rod slide inside the guide groove respectively, and a warning device is respectively provided at both ends of the side surfaces of the second support plate.

[0016] Preferably, the alarm device comprises a plurality of baffles hinged to the side of one support plate, the top and the bottom of each baffle are hinged together by a metal rod, each metal rod is elastically connected to the side of the second support plate by a second spring sheet, and a rectangular groove for placing the baffle is provided on the second support plate, and the rectangular groove is painted with a color different from that of the baffle and the first support plate.

[0017] Preferably, the guide groove consists of a vertical groove and an inclined groove, and the second warning component also includes a spring telescopic rod located between the vertical groove and the inclined groove.

[0018] The construction method of deep foundation pit support structure in complex urban environment, the specific steps are as follows;

[0019] 1. When a slight collapse occurs near the upper end of the inner wall of the foundation pit, the bearing plate and the support plate 1 will gradually become an acute angle. The support plate 1 drives the telescopic end of the telescopic plate away from the bearing plate, the limit plate is pulled, and the trigger rod presses the locking plate itself down through the groove on the locking plate, so that the locking plate is not in a clamping relationship with the positioning plate. The tension spring pulls the positioning plate to squeeze the air flow inside the bellows and blows two whistles. The guide rod is inclined, which makes the positioning plate move while the warning plate is erected through the support of the guide rod;

[0020] 2. When the upper end of the inner wall of the foundation pit collapses, the angle between the base and the second support plate will be acute, the end of the plastic rod will be squeezed and slide in the guide groove, and the baffle close to the side of the plastic rod will be folded. Under the guidance of the metal rod, each baffle will be folded, and the color in the rectangular groove will be displayed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention cooperates with structures such as a trigger component and a warning component. When a slight landslide occurs near the upper end of the inner wall of the foundation pit, the bearing plate and the supporting plate will no longer be at a right angle of ninety degrees. The supporting plate drives the telescopic end of the telescopic plate away from the bearing plate, and the limit plate is pulled at the same time. The trigger rod presses the locking plate itself down through the groove on the locking plate and is no longer in a clamping state with the positioning plate. The tension spring pulls the positioning plate to squeeze the air flow inside the bellows, and two whistles are blown to warn the surrounding staff. The guide rod is inclined, which makes the positioning plate move while erecting the warning plate through the support of the guide rod, thereby further helping the staff to determine the location of the landslide and effectively preventing the continuous landslide of the foundation pit.

[0023] The present invention cooperates with the structures of the foundation pit and the warning component. When the upper end of the inner wall of the foundation pit collapses, the angle between the base and the second supporting plate will be acute. Furthermore, the end of the plastic rod will be squeezed and slide in the guide groove, and will gradually contact and fold the baffle plate close to one side of the plastic rod. At this time, the color display in the rectangular groove can effectively warn the workers in the foundation pit to quickly alert the workers on the ground, and at the same time, they can also obtain sufficient self-rescue time.

[0024] The present invention cooperates with the structures of the foundation pit and the warning component II, slides the spring telescopic rod, moves the plastic rod into the vertical groove, directly folds the base to be close to the support plate II, and at the same time folds the load-bearing plate to be close to the side of the support plate I. At this time, the limit plate and the trigger rod will be separated from the locking plate and the warning component I, and the warning component I will be triggered at this time. However, directly folding the warning plate can return all the structures of the warning component I to the original position, and the positioning plate will be clamped with the locking plate again, so that the device is easy to operate, and the folded device is also easy to carry and store. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the appearance structure of the support structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the structural splitting of the support plate 1 and the support plate 2 of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure coordination between the trigger component and the warning component of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal structure of the warning plate of the present invention;

[0030] Figure 6 It is a cross-sectional front view of the structure matching between the trigger component and the warning component of the present invention;

[0031] Figure 7 It is a schematic diagram of the positions of the whistle and the warning plate of the present invention;

[0032] Figure 8 It is a schematic cross-sectional view of the internal structure of the warning plate of the present invention;

[0033] Fig. 9 It is a schematic diagram of the structural coordination between the second support plate and the second warning component of the present invention;

[0034] Fig.10 It is a schematic diagram of the explosion of the support plate 2 and the warning component 2 structure of the present invention.

[0035] In the figure: 1. foundation pit; 2. supporting structure; 21. support plate 1; 22. support plate 2; 23. load-bearing plate; 24. positioning pin; 3. trigger assembly; 31. telescopic plate; 32. limit plate; 33. trigger rod; 34. locking plate; 35. limit groove; 36. spring sheet 1; 4. warning assembly 1; 41. warning plate; 42. bellows; 43. positioning plate; 44. support rod; 45. tension spring; 46. guide rod; 47. whistle; 5. warning assembly 2; 51. base; 52. plastic rod; 53. guide groove; 54. spring telescopic rod; 55. alarm; 551. baffle; 552. metal rod; 553. spring sheet 2. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 10 As shown, the present invention provides a deep foundation pit support structure in a complex urban environment, comprising a foundation pit 1, and a plurality of support structures 2 placed on the top of the foundation pit 1;

[0038] The supporting structure 2 includes a bearing plate 23 placed on the top of the foundation pit 1, a support plate 1 21 is hinged on the side of the bearing plate 23, a support plate 2 22 is slidably connected to the side of the support plate 1 21, and two positioning pins 24 are symmetrically inserted and penetrated on the top of the bearing plate 23;

[0039] The deep foundation pit support structure in the complex urban environment also includes a trigger component 3, a warning component 1 4 and a warning component 2 5;

[0040] The trigger assembly 3 includes a telescopic plate 31 fixed to the side of the supporting plate 21, the telescopic end of the telescopic plate 31 is hinged with a limit plate 32 that slides horizontally on the top of the bearing plate 23, and a locking plate 34 slides vertically on the top of the bearing plate 23. The middle of the locking plate 34 is provided with a groove, and the limit plate 32 is provided with a trigger rod 33 located in the groove;

[0041] The warning component 14 includes a warning plate 41 hinged to the top of the bearing plate 23, a positioning plate 43 is slidably installed at the bottom of the warning plate 41, and the positioning plate 43 is connected to the warning plate 41 through a bellows 42. A support rod 44 is fixed inside the warning plate 41, and the support rod 44 movably penetrates the positioning plate 43 and the bellows 42. A tension spring 45 wound around the outer periphery of the support rod 44 is installed inside the bellows 42. The side of the positioning plate 43 is hinged to the top of the bearing plate 23 through a guide rod 46, and the outer periphery of the bellows 42 is respectively connected to two symmetrically arranged whistles 47;

[0042] The positioning plate 43 and the locking plate 34 are in a clamping connection;

[0043] The warning component 2 5 includes a base 51 hinged to the bottom of the supporting plate 1 21 , and two positioning pins 24 are also penetrated through the top of the base 51 , and each positioning pin 24 is inserted into the foundation pit 1 .

[0044] The above scheme is adopted: when a slight collapse occurs near the upper end of the inner wall of the foundation pit 1, the bearing plate 23 and the supporting plate 1 21 will no longer be at a right angle of 90 degrees, but will gradually become an acute angle. At this time, the supporting plate 1 21 drives the telescopic end of the telescopic plate 31 away from the bearing plate 23, and the limit plate 32 is pulled at the same time. The trigger rod 33 presses the locking plate 34 itself down through the groove on the locking plate 34, so that the locking plate 34 is not in a clamping relationship with the positioning plate 43, and the tension spring 45 pulls the positioning plate 43 to squeeze the air flow inside the bellows 42, and blows two whistles 47 to further warn the surrounding staff, and at the same time, it can effectively prevent the foundation pit 1 from continuing to collapse;

[0045] It should also be noted that the guide rod 46 is inclined, so that when the positioning plate 43 moves, the warning plate 41 is erected through the support of the guide rod 46, thereby further helping the staff to determine the location of the landslide.

[0046] like Figure 7 and Figure 8 As shown, a slot for placing a whistle 47 is provided on the top of the warning plate 41, and the sound outlet of the whistle 47 faces upward.

[0047] With the above solution, the position and material design of the whistle 47 enable the sound it emits to be better transmitted to a distance, and the notch on the warning plate 41 can reduce the probability of the device being damaged by being hit by materials on the construction site during use.

[0048] like Figure 1-Figure 6 As shown, the trigger assembly 3 also includes a spring sheet 36, which is supported on the bottom of the locking plate 34. The two sides of the groove on the top of the locking plate 34 are inclined, and a limiting groove 35 is respectively provided at both ends of the top of the locking plate 34. The limiting groove 35 is semicircular and the inner diameter value is adapted to the outer diameter value of the trigger rod 33.

[0049] The spring sheet 1 36 always supports the locking plate 34 to rise to a fixed position, and the contact surfaces of the locking plate 34 and the positioning plate 43 are both frosted.

[0050] With the above solution, when the upper end of the inner wall of the foundation pit 1 collapses, the angle between the bearing plate 23 and the supporting plate 1 21 changes from a right angle to an acute angle, and the supporting plate 1 21 drives the limit plate 32 and the trigger rod 33 away from the bearing plate 23 through the telescopic end of the telescopic plate 31, and the inclined surface of the groove at the top of the locking plate 34 can help the trigger rod 33 to slide better and press the locking plate 34 to descend;

[0051] When the lower end of the inner wall of the foundation pit 1 collapses, the angle between the bearing plate 23 and the supporting plate 21 changes from a right angle to an obtuse angle, and the supporting plate 21 drives the limiting plate 32 and the trigger rod 33 to approach the bearing plate 23 through the telescopic end of the telescopic plate 31. Furthermore, the trigger rod 33 can still press the locking plate 34 to disengage from the positioning plate 43 through the inclined surface on the groove, and the trigger rod 33 is finally located in the limiting groove 35, and the warning component 4 can also be triggered well. Furthermore, no matter where the collapse position of the foundation pit 1 is, the device can issue a warning to the surrounding staff, thereby improving the warning effect of the device;

[0052] like Figure 1 , Figure 2 , Fig. 9 and Fig.10As shown, the warning component 2 5 also includes a plastic rod 52 symmetrically hinged to the top of the base 51, and two guide grooves 53 are respectively provided at both ends of the side of the support plate 22. The ends of each plastic rod 52 slide inside the guide groove 53, and a warning device 55 is respectively provided at both ends of the side of the support plate 22.

[0053] The warning device 55 includes a plurality of baffles 551 hinged to the side of the support plate 21, and the top and the bottom of each baffle 551 are hinged together through a metal rod 552 respectively, and each metal rod 552 is elastically connected to the side of the support plate 22 through a spring sheet 553. A rectangular groove for placing the baffle 551 is opened on the support plate 22, and the rectangular groove is painted with a color different from that of the baffle 551 and the support plate 21.

[0054] Using the above solution: Figure 2 The structural coordination between the supporting structure 2 and the base 51 can be clearly observed in the figure. When the lower end of the inner wall of the foundation pit 1 collapses, the workers in the foundation pit 1 can clearly feel it. However, when the upper end of the inner wall of the foundation pit 1 collapses slightly, since the upper end is far away from the workers in the foundation pit 1, their perception of the collapse becomes weaker. When the upper end collapses, the angle between the base 51 and the supporting plate 22 will be acute. Furthermore, the end of the plastic rod 52 will be squeezed and slide in the guide groove 53, and at the same time will gradually contact and fold the baffle 551 close to the side of the plastic rod 52. Under the guidance of the metal rod 552, each baffle 551 will be folded. At this time, the color display in the rectangular groove can effectively warn the workers in the foundation pit 1 to quickly and the workers on the ground, and at the same time, they can also get enough self-rescue time.

[0055] like Figure 1-Figure 10 As shown, the guide slot 53 is composed of a vertical slot and an inclined slot, and the warning component 2 5 also includes a spring telescopic rod 54 located between the vertical slot and the inclined slot.

[0056] The above solution is adopted: when the plastic rod 52 slides in the inclined groove, it can play a warning role, but the sliding spring telescopic rod 54 moves the plastic rod 52 to the vertical groove, directly folds the base 51 to be close to the supporting plate 22, and at the same time folds the bearing plate 23 to be close to the side of the supporting plate 1 21, at this time, the limit plate 32 and the trigger rod 33 will be separated from the locking plate 34 and the warning component 1 4;

[0057] However, it should be noted that the warning component 4 will be triggered at this time, but directly folding the warning plate 41 can make all the structures of the warning component 4 return to the original position, and the positioning plate 43 will also be engaged with the locking plate 34 again, making the device easy to operate and the folded device also easy to carry and store.

[0058] The construction method of deep foundation pit support structure in complex urban environment, the specific steps are as follows;

[0059] 1. When a slight collapse occurs near the upper end of the inner wall of the foundation pit 1, the bearing plate 23 and the supporting plate 1 21 will gradually become an acute angle, and the supporting plate 1 21 drives the telescopic end of the telescopic plate 31 away from the bearing plate 23, and the limit plate 32 is pulled, and the trigger rod 33 presses the locking plate 34 itself down through the groove on the locking plate 34, so that the locking plate 34 is not in a clamping relationship with the positioning plate 43, and the tension spring 45 pulls the positioning plate 43 to squeeze the air flow inside the bellows 42, and blows two whistles 47, and the guide rod 46 is inclined, so that while the positioning plate 43 moves, the warning plate 41 will also be erected through the support of the guide rod 46;

[0060] 2. When the upper end of the inner wall of the foundation pit 1 collapses, the angle between the base 51 and the supporting plate 22 will be acute, and the end of the plastic rod 52 will be squeezed and slid in the guide groove 53, and the baffle 551 close to the side of the plastic rod 52 will be folded. After being guided by the metal rod 552, each baffle 551 will be folded, and the color in the rectangular groove will be displayed.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deep foundation pit support structure in a complex urban environment, comprising a foundation pit (1), characterized in that: It also includes a plurality of support structures (2) placed on the top of the foundation pit (1); The support structure (2) comprises a bearing plate (23) placed on the top of the foundation pit (1), a side of the bearing plate (23) is hingedly connected with a supporting plate 1 (21), a side of the supporting plate 1 (21) is slidably connected with a supporting plate 2 (22), and two positioning pins (24) are symmetrically inserted and penetrated through the top of the bearing plate (23); The deep foundation pit support structure under complex urban environment also includes a trigger component (3), a warning component 1 (4) and a warning component 2 (5); The trigger assembly (3) comprises a telescopic plate (31) fixedly mounted on the side of a supporting plate (21), the telescopic end of the telescopic plate (31) is hinged with a limit plate (32) which slides horizontally on the top of a bearing plate (23), the top of the bearing plate (23) is vertically slid with a locking plate (34), a groove is provided in the middle of the locking plate (34), and a trigger rod (33) located in the groove is provided on the limit plate (32); The warning component 1 (4) comprises a warning plate (41) hinged to the top of the bearing plate (23), a positioning plate (43) is slidably installed at the bottom of the warning plate (41), the positioning plate (43) is connected to the warning plate (41) through a bellows (42), a support rod (44) is fixed inside the warning plate (41), the support rod (44) movably passes through the positioning plate (43) and the bellows (42), a tension spring (45) wound around the outer circumference of the support rod (44) is installed inside the bellows (42), the side of the positioning plate (43) is hinged to the top of the bearing plate (23) through a guide rod (46), and the outer circumference of the bellows (42) is respectively connected to two symmetrically arranged whistles (47); The positioning plate (43) and the locking plate (34) are in a clamping connection; The warning component 2 (5) comprises a base (51) hinged to the bottom of the supporting plate 1 (21), and two positioning pins (24) are also passed through the top of the base (51), and each of the positioning pins (24) is inserted into the foundation pit (1).

2. The deep foundation pit support structure under complex urban environment according to claim 1 is characterized by: The top of the warning plate (41) is provided with a notch for placing a whistle (47), and the sound outlet of the whistle (47) faces upward.

3. The deep foundation pit support structure under complex urban environment according to claim 2 is characterized by: The trigger assembly (3) further comprises a spring sheet (36), the spring sheet (36) being supported on the bottom of the locking plate (34), the two sides of the groove at the top of the locking plate (34) being inclined, and a limiting groove (35) being respectively formed at the two ends of the top of the locking plate (34), the limiting groove (35) being semicircular and having an inner diameter value matching the outer diameter value of the trigger rod (33).

4. The deep foundation pit support structure under complex urban environment according to claim 3 is characterized by: The spring sheet 1 (36) always supports the locking plate (34) to rise to a fixed posture, and the contact surfaces of the locking plate (34) and the positioning plate (43) are both frosted.

5. The deep foundation pit support structure under complex urban environment according to claim 4 is characterized by: The warning component 2 (5) further comprises a plastic rod (52) symmetrically hinged to the top of the base (51), two guide grooves (53) are respectively provided at both ends of the side surface of the supporting plate 2 (22), and the ends of each of the plastic rods (52) slide inside the guide grooves (53), and a warning device (55) is respectively provided at both ends of the side surface of the supporting plate 2 (22).

6. The deep foundation pit support structure under complex urban environment according to claim 5 is characterized by: The warning device (55) comprises a plurality of baffles (551) hinged to the side of the first support plate (21), the top and the bottom of each baffle (551) being hinged together via a metal rod (552), each metal rod (552) being elastically connected to the side of the second support plate (22) via a second spring sheet (553), and a rectangular groove for placing the baffle (551) is provided on the second support plate (22), and the rectangular groove is painted with a color different from that of the baffle (551) and the first support plate (21).

7. The deep foundation pit support structure under complex urban environment according to claim 6 is characterized by: The guide groove (53) consists of a vertical groove and an inclined groove, and the second warning component (5) also includes a spring telescopic rod (54) located between the vertical groove and the inclined groove.

8. A construction method for a deep foundation pit support structure under a complex urban environment, which is applied to the deep foundation pit support structure under a complex urban environment as claimed in claim 7, characterized in that: The specific steps are as follows; (1) When a slight collapse occurs near the upper end of the inner wall of the foundation pit (1), the bearing plate (23) and the supporting plate (21) gradually become an acute angle, the supporting plate (21) drives the telescopic end of the telescopic plate (31) away from the bearing plate (23), the limit plate (32) is pulled, and the trigger rod (33) presses the locking plate (34) itself downward through the groove on the locking plate (34), so that the locking plate (34) is not in a clamping relationship with the positioning plate (43), the tension spring (45) pulls the positioning plate (43) to squeeze the air flow inside the bellows (42), and blows two whistles (47), the guide rod (46) is inclined, so that when the positioning plate (43) moves, the warning plate (41) is also erected through the support of the guide rod (46); (2) When the upper end of the inner wall of the foundation pit (1) collapses, the angle between the base (51) and the second supporting plate (22) will be acute, and the end of the plastic rod (52) will be squeezed and slid in the guide groove (53), and the baffle (551) close to the side of the plastic rod (52) will be folded. After being guided by the metal rod (552), each baffle (551) will be folded, and the color in the rectangular groove will be displayed.

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