An assembled building for construction projects

Abstract

This application relates to the field of prefabricated building materials, and discloses an assembled building for construction projects, including precast slabs, fastening mechanisms, and installation mechanisms. Through the provided installation mechanism, when hoisting the precast slab, the guide plate is pre-sleeved on the inserted steel bars embedded at the construction site, and then one end of the steel cable is pulled. At this time, driven by the steel cable, the precast slab will move horizontally while being lifted, and the bottom opening of the grouting sleeve in the precast slab will align with the inserted steel bars embedded at the construction site. At this time, only need to lower the precast slab by the crane and keep the steel cable in a taut state, then the grouting sleeve can be accurately sleeved on the inserted steel bars, thus eliminating the need to use methods such as mirrors to observe the matching situation between the grouting sleeve and the inserted steel bars. Not only does it not require construction workers to approach to observe whether the precast slab is aligned, protecting the personal safety of construction workers, but also the precast slab can be quickly lowered, thereby improving the installation efficiency and reducing the construction time required.

Description

Technical Field

[0001] The present application relates to the technical field of prefabricated building materials, and in particular to an assembled building used in construction projects. Background Art

[0002] Prefabricated buildings refer to buildings whose floor slabs, wall panels, stairs, balconies and other components are first processed and manufactured in factories. After being transported to the construction site, they are assembled and installed on-site through fixing methods such as concrete grouting. Compared with cast-in-place buildings, prefabricated buildings have the advantages of saving resources and energy, reducing construction pollution, and improving labor productivity and quality and safety levels. They are being vigorously developed by the country.

[0003] During the construction of existing prefabricated buildings, the wall panels are first lifted by a crane, and then the pre-buried grouting sleeves at the bottom of the wall panels are put on the reserved dowel bars with the cooperation of the staff. Then, inclined supports are used to adjust the verticality of the wall panels, and then grouting is poured into the grouting sleeves. After the concrete solidifies, the installation of the wall panels is completed. After that, it is necessary to cast fixed columns to fix the two adjacent wall panels together. However, in the assembly construction process, since the grouting sleeve interface of the wall panel is located at the bottom of the wall panel, it is difficult to align it during hoisting, resulting in slow hoisting construction. At the same time, since the fixed columns need to be cast after the wall panels are installed, the binding steel bars extending from the left and right sides of the wall panel will collide with or interfere with the steel bars of the fixed columns during hoisting, increasing the difficulty of hoisting construction. Summary of the invention

[0004] The present application proposes an assembled building for construction projects, which has the advantage of quick assembly and is used to solve the problem that the existing prefabricated wall panels are easily blocked by reserved steel bars during installation, resulting in increased installation time.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a prefabricated building for construction engineering, comprising:

[0006] A prefabricated board, wherein the prefabricated board comprises symmetrically arranged reserved vertical grooves from the top surface to the bottom surface, two rows of circular grooves are arranged on the left and right sides of the prefabricated board, the circular grooves are connected to the reserved vertical grooves, and a plurality of grouting sleeves are pre-buried in the prefabricated board;

[0007] A fastening mechanism, the fastening mechanism comprising a sliding sleeve slidably connected in the circular groove, wherein a curved angle rod is fixedly sleeved in the sliding sleeve;

[0008] Installation mechanism, the installation mechanism includes a guide plate, a steel cable and an inclined plane slider. The guide plate is located at the bottom of the precast slab and is penetrated by the steel cable. A cylindrical slider is fixedly sleeved on the steel cable. The top end of the cylindrical slider is press-fitted into the guide plate. A plurality of installation holes are provided on the guide plate. A plurality of push columns are also press-fitted into the guide plate. The inclined plane slider is slidably connected in the reserved vertical groove and is penetrated by the steel cable.

[0009] Preferably, the fastening mechanism further includes a positioning sleeve. The positioning sleeve is fixedly sleeved at one end of the circular chute located on the outer side of the precast slab. One end of the sliding sleeve is located in the reserved vertical groove and is fixedly connected with a push block.

[0010] Preferably, a guide block is fixedly embedded on the inner side surface of the reserved vertical groove. A guide chute is provided on the outer side surface of the sliding sleeve. The guide block extends into the guide chute.

[0011] Preferably, a first spring is slidably sleeved on the bent angle rod. After the sliding sleeve is pushed towards the outside of the precast slab, the first spring is compressed and the guide block rotates the sliding sleeve and the bent angle rod by 90°.

[0012] Preferably, the installation mechanism further includes a metal plate fixedly connected to the bottom surface of the precast slab. The metal plate is located at the bottom end of the reserved vertical groove and is penetrated by the steel cable.

[0013] Preferably, parallel inclined planes are provided on the bottom surface of the push block and the top surface of the inclined plane slider. After the inclined plane slider moves upward and contacts the push block, the push block moves towards the outer side of the precast slab.

[0014] Preferably, the push columns are located around the cylindrical slider and are centrosymmetric about the center of the cylindrical slider.

[0015] Preferably, a plurality of storage chutes are provided on the outer side surface of the cylindrical slider. A clamping block is slidably connected in the storage chute. A second spring is elastically connected between the clamping block and the storage chute. The second spring pushes the clamping block outwards.

[0016] Preferably, the distance between two adjacent installation holes is equal to the distance between the reserved reinforcing bars on the construction site. A conical ring coaxial with the installation hole is fixedly connected to the top surface of the guide plate. The inner hole diameter of the conical ring is the same as that of the installation hole.

[0017] Preferably, symmetric lifting rings are pre-buried on the top surface of the precast slab. A fastening clamp is fixedly connected to the bottom end of the steel cable. The length of the fastening clamp is less than the diameter of the cylindrical slider. The fastening clamp abuts against the bottom surface of the cylindrical slider.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, through the provided installation mechanism, when hoisting a precast slab, the guide plate is pre - sleeved on the inserted steel bars embedded at the construction site. Subsequently, one end of the steel cable is pulled. At this time, driven by the steel cable, the precast slab will move horizontally while being lifted. When the section of the steel cable inside the precast slab is in a vertical state, the bottom opening of the grouting sleeve inside the precast slab is aligned with the inserted steel bars embedded at the construction site. At this time, only need to lower the precast slab by the crane while keeping the steel cable taut, then the grouting sleeve can be accurately sleeved on the inserted steel bars. Thus, there is no need to use methods such as mirrors to observe the matching situation between the grouting sleeve and the inserted steel bars. Not only does it not require construction workers to approach to observe whether the precast slab is aligned, protecting the personal safety of construction workers, but also when lowering the precast slab, just keeping the steel cable taut can quickly lower the precast slab, thereby improving the installation efficiency and reducing the construction time required.

[0020] 2. Secondly, through the provided fastening mechanism, when the crane lowers the precast slab, the bent part of the angled rod faces upward, thus avoiding the interference such as collision and crossing between the protruding steel bars on the left and right sides and the long strip steel bars embedded in the cast - in - place fixed column when the existing type of precast wall panel is lowered, which causes the precast slab to be unable to be stably lowered and requires frequent adjustment of the position of the precast slab to accurately sleeve the grouting sleeve on the inserted steel bars on the site. After the installation is completed, as the steel cable is continuously lifted upward, at this time the cylindrical slider is continuously lifted upward. Since the guide plate is in interference fit with the cylindrical slider, it moves upward synchronously. At this time, the top of the push column abuts against the bottom surface of the precast slab. As the steel cable is continuously pulled upward, the push column slides downward relative to the guide plate, thereby pushing the block inward, and then separating the cylindrical slider from the guide plate. After that, when the steel cable is continuously lifted, the steel cable drives the inclined - plane slider to move upward through the cylindrical slider, thereby pushing the push block to slide outward. At this time, the angled rod extends outward. As the angled rod slides, the sliding sleeve rotates during the sliding process due to the guiding action of the guiding block. At this time, the bent part of the angled rod faces the long strip steel bars embedded in the cast - in - place fixed column. And as the inclined - plane slider no longer contacts the push block, at this time, under the pushing action of the first spring, the angled rod slides into the interior of the precast slab, so that the bent part of the angled rod hooks the long strip steel bars. In the case where the long strip steel bars have been tied up, multiple angled rods hooking the steel reinforcement cages on both sides can ensure the stability of the precast slab and prevent large - amplitude shaking when construction workers adjust the verticality of the precast slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles of the present application in a clear and understandable manner.

[0022] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, wherein:

[0023] Figure 1Schematic diagram of the overall structure of the present invention;

[0024] Figure 2 Schematic diagram of the sectional structure of the upper left corner of the precast slab of the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged view at position A in;

[0026] Figure 4 Schematic diagram of the sectional structure of the lower left corner of the precast slab of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged view at position B in;

[0028] Figure 6 Partial sectional view of the installation mechanism of the present invention.

[0029] Wherein: 1, precast slab; 11, reserved vertical groove; 12, lifting ring; 13, circular sliding groove; 14, grouting sleeve; 2, fastening mechanism; 21, sliding sleeve; 22, positioning sleeve; 23, bent corner rod; 24, push block; 25, first spring; 26, guiding sliding groove; 27, guiding block; 3, installation mechanism; 31, guiding plate; 32, pushing column; 33, cylindrical slider; 34, steel cable; 35, fastening clamp; 36, metal plate; 37, inclined plane slider; 38, receiving sliding groove; 39, clamping block; 310, second spring; 311, installation hole. Detailed implementation manner

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0031] As Figures 1 to 6 shown, an assembled building for construction engineering in this embodiment includes:

[0032] Precast slab 1, the precast slab 1 includes symmetrically arranged reserved vertical grooves 11 from the top surface to the bottom surface, two rows of circular sliding grooves 13 are opened on both the left and right sides of the precast slab 1, the circular sliding grooves 13 communicate with the reserved vertical grooves 11, and a plurality of grouting sleeves 14 are embedded in the precast slab 1;

[0033] Fastening mechanism 2, the fastening mechanism 2 includes a sliding sleeve 21 slidably connected in the circular sliding groove 13, and a bent corner rod 23 is fixedly sleeved in the sliding sleeve 21;

[0034] Installation mechanism 3. The installation mechanism 3 includes a guide plate 31, a steel cable 34, and an inclined plane slider 37. The guide plate 31 is located at the bottom of the precast slab 1 and is penetrated by the steel cable 34. A cylindrical slider 33 is fixedly sleeved on the steel cable 34. The top end of the cylindrical slider 33 is press-fitted into the guide plate 31. A plurality of installation holes 311 are formed in the guide plate 31. A plurality of push columns 32 are also press-fitted into the guide plate 31. The inclined plane slider 37 is slidably connected in the reserved vertical groove 11 and is penetrated by the steel cable 34.

[0035] In the present invention, through the arranged installation mechanism 3, when hoisting the precast slab 1, the guide plate 31 is pre-sleeved on the inserted steel bars embedded at the construction site, and then one end of the steel cable 34 is pulled. At this time, driven by the steel cable 34, the precast slab 1 will move horizontally when being lifted. When the section of the steel cable 34 inside the precast slab 1 is in a vertical state, the bottom opening of the grouting sleeve 14 in the precast slab 1 is aligned with the inserted steel bars embedded at the construction site. At this time, it only needs to lower the precast slab 1 by the crane while keeping the steel cable 34 in a taut state, so that the grouting sleeve 14 can be accurately sleeved on the inserted steel bars, thus eliminating the need to use current methods such as mirrors to observe the matching situation between the grouting sleeve 14 and the inserted steel bars. Not only does it not require construction workers to approach to observe whether the precast slab 1 is aligned, protecting the personal safety of construction workers, but also when lowering the precast slab 1, only by keeping the steel cable 34 taut, the precast slab 1 can be quickly lowered, thereby improving the installation efficiency and reducing the construction time required.

[0036] Secondly, through the provided fastening mechanism 2, when the crane lowers the precast slab 1, the bent part of the bent-angle rod 23 faces upward, thus avoiding the interference such as collision and crossing between the steel bars protruding from the left and right sides and the long steel bars embedded in the casting fixed column when the existing type of precast wall panel is lowered, which causes the precast slab 1 to be unable to be lowered stably and requires frequent adjustment of the position of the precast slab 1 to accurately sleeve the grouting sleeve 14 onto the inserted steel bars on the site. After the installation is completed, as the steel cable 34 is continuously lifted upward, at this time, the cylindrical slider 33 is continuously lifted upward. Since the guide plate 31 is in interference fit with the cylindrical slider 33 and moves upward synchronously, the top end of the push column 32 abuts against the bottom surface of the precast slab 1 at this time. As the steel cable 34 is continuously pulled upward, the push column 32 slides downward relative to the guide plate 31, thereby pushing the clamping block 39 inward, and further separating the cylindrical slider 33 from the guide plate 31. After that, when the steel cable 34 is continuously lifted, the steel cable 34 drives the inclined-plane slider 37 to move upward through the cylindrical slider 33, thereby pushing the push block 24 to slide outward. At this time, the bent-angle rod 23 extends outward. As the bent-angle rod 23 slides, the sliding sleeve 21 rotates during the sliding process due to the guiding action of the guiding block 27. At this time, the bent part of the bent-angle rod 23 faces the long steel bars embedded in the casting fixed column. As the inclined-plane slider 37 no longer contacts the push block 24, at this time, under the pushing action of the first spring 25, the bent-angle rod 23 slides into the interior of the precast slab 1, so that the bent part of the bent-angle rod 23 hooks the long steel bars. In the case where the long steel bars have been tied up, multiple bent-angle rods 23 hooking the steel reinforcement cages on both sides can ensure the stability of the precast slab 1 and prevent large-amplitude shaking when the construction personnel adjust the verticality of the precast slab 1.

[0037] Among them, the fastening mechanism 2 further includes a positioning sleeve 22. The positioning sleeve 22 is fixedly sleeved at one end of the circular chute 13 located on the outer side of the precast slab 1. One end of the sliding sleeve 21 is located in the reserved vertical groove 11 and is fixedly connected with a push block 24. The inner side surface of the reserved vertical groove 11 is fixedly embedded with a guiding block 27. The outer side surface of the sliding sleeve 21 is provided with a guiding chute 26. The guiding block 27 extends into the guiding chute 26. A first spring 25 is slidably sleeved on the bent-angle rod 23. After the sliding sleeve 21 is pushed outward from the precast slab 1, the first spring 25 is compressed and the guiding block 27 rotates the sliding sleeve 21 and the bent-angle rod 23 by 90°.

[0038] The guiding chute 26 is composed of a straight line one, a straight line two and an inclined line one in the case of planar unfolding. The straight line one and the straight line two are parallel to each other, and the inclined line one forms a 45° angle with the straight line two. The guiding block 27 is initially located in the straight line one.

[0039] When the sliding sleeve 21 is driven to slide outward from the precast slab 1, as the guiding block 27 slides in the guiding chute 26, when the guiding block 27 enters the inclined line one, it will drive the sliding sleeve 21 to rotate, so that the bent-angle rod 23 rotates, so that the bent-angle rod 23 can be hooked on the long steel bars subsequently.

[0040] After the rotation of the sliding sleeve 21 and the angle rod 23 is completed, as the inclined slider 37 separates from the push block 24, the sliding sleeve 21 is pushed into the precast plate 1 under the action of the first spring 25, and the guide block 27 enters the straight line 2 from the oblique line 1 and slides in the straight line 2. The limiting effect of the guide block 27 on the guide slot 26 prevents the angle rod 23 from rotating and failing to stably hook on the long steel bar.

[0041] Among them, the installation mechanism 3 also includes a metal plate 36 fixedly connected to the bottom surface of the prefabricated panel 1, the metal plate 36 is located at the bottom end of the reserved vertical groove 11, the metal plate 36 is penetrated by the steel cable 34, and the bottom surface of the push block 24 and the top surface of the inclined slider 37 are provided with parallel inclined surfaces. After the inclined slider 37 moves upward and contacts with the push block 24, the push block 24 moves toward the outer side surface of the prefabricated panel 1.

[0042] The diameter of the hole in the metal plate 36 through which the steel cable 34 passes is larger than the diameter of the cylindrical slider 33, so that the cylindrical slider 33 can pass through the metal plate 36 and abut against the bottom of the inclined slider 37. In this way, when the steel cable 34 is recovered, the steel cable 34 can drive the inclined slider 37 to slide upward, thereby allowing the inclined slider 37 to drive the clamping mechanism 2 to work.

[0043] Among them, the pushing column 32 is located around the cylindrical slider 33 and is symmetrical with the center of the cylindrical slider 33. A plurality of receiving grooves 38 are opened on the outer side of the cylindrical slider 33. A block 39 is slidably connected in the receiving groove 38. A second spring 310 is elastically connected between the block 39 and the receiving groove 38. The second spring 310 pushes the block 39 outward.

[0044] The spacing between the two mounting holes 311 is equal to the spacing between the dowel bars reserved at the construction site. A truncated cone ring coaxial with the mounting hole 311 is fixedly connected to the top surface of the guide plate 31 , and the inner hole diameter of the truncated cone ring is the same as that of the mounting hole 311 .

[0045] On the one hand, the truncated cone ring plays a guiding role. When the grouting sleeve 14 is sleeved on the dowels reserved on the construction site, the axis of the dowels is coincident with the axis of the grouting sleeve 14 through the action of the truncated cone ring, so as to prevent the dowels from sticking to the inner wall of the grouting sleeve 14, resulting in the inability to effectively form a holding effect after grouting, making it easy for the dowels and the grouting sleeve 14 to separate in the later stage, affecting the stability of the prefabricated panel 1 during use. On the other hand, the truncated cone ring increases the contact area between the guide plate 31 and the dowels, increases the friction, and prevents the guide plate 31 from detaching from the dowels when the steel cable 34 is tightened.

[0046] Among them, the top surface of the prefabricated plate 1 is pre-embedded with symmetrical lifting rings 12, and the bottom end of the steel cable 34 is fixedly connected with a fastening card 35, the length of the fastening card 35 is smaller than the diameter of the cylindrical slider 33, and the fastening card 35 abuts against the bottom surface of the cylindrical slider 33.

[0047] Working principle:

[0048] When using the present invention, in the hoisting process, first, the top end of the steel cable 34 is sequentially passed through the guide plate 31, the metal plate 36 and the inclined surface slider 37. Then, the inclined surface slider 37 is placed into the reserved vertical groove 11. Next, the metal plate 36 is fixed to the bottom surface of the precast slab 1 to prevent the inclined surface slider 37 from sliding out of the reserved vertical groove 11 during hoisting, and the top end of the steel cable 34 extends out of the top end of the reserved vertical groove 11, so that the steel cable 34 is fixed or hangs on the outer side surface of the precast slab 1.

[0049] After the hoisting machine hoists the precast slab 1 to the construction site, first, the guide plate 31 is installed on the corresponding inserted bar. Subsequently, while the hoisting machine lowers the precast slab 1, the steel cable 34 is pulled / retracted. At this time, under the traction of the steel cable 34, the grouting sleeve 14 is aligned with the inserted bar below. As the hoisting machine continues to lower, the grouting sleeve 14 is accurately sleeved on the inserted bar to ensure the accuracy of the installation of the precast slab 1.

[0050] Then, continue to pull / retract the steel cable 34 to move the guide plate 31 upward, so that the push column 32 pushes the block 39 to retract into the cylindrical slider 33. At this time, continue to pull / retract the steel cable 34 to make the cylindrical slider 33 disengage from the guide plate 31 and abut against the bottom surface of the inclined surface slider 37. Thus, when continuing to pull / retract the steel cable 34, the inclined surface slider 37 contacts the push block 24 during the upward movement, thereby pushing the push block 24 to move outward of the precast slab 1, so that the bent angle rod 23 extends outward and rotates. Then, as the inclined surface slider 37 no longer contacts the push block 24, the bent angle rod 23 slides into the precast slab 1 under the resilience of the first spring 25, so that the bent part of the bent angle rod 23 hooks the long strip steel bar to ensure the stability of the precast slab 1 during installation.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An assembled building for construction projects, characterized in that, Comprising: A precast slab (1), the precast slab (1) includes reserved vertical grooves (11) symmetrically opened from the top surface to the bottom surface, two rows of circular sliding grooves (13) are opened on both the left and right sides of the precast slab (1), the circular sliding grooves (13) communicate with the reserved vertical grooves (11), and a plurality of grouting sleeves (14) are embedded in the precast slab (1); A fastening mechanism (2), the fastening mechanism (2) includes a sliding sleeve (21) slidably connected in the circular sliding groove (13), and a bent rod (23) is fixedly sleeved in the sliding sleeve (21); An installation mechanism (3), the installation mechanism (3) includes a guide plate (31), a steel cable (34) and an inclined plane slider (37), the guide plate (31) is located at the bottom of the precast slab (1) and is penetrated by the steel cable (34), a cylindrical slider (33) is fixedly sleeved on the steel cable (34), the top end of the cylindrical slider (33) is press-fitted in the guide plate (31), a plurality of installation holes (311) are opened on the guide plate (31), and a plurality of push columns (32) are also press-fitted in the guide plate (31), the inclined plane slider (37) is slidably connected in the reserved vertical groove (11) and is penetrated by the steel cable (34).

2. The prefabricated building for construction projects according to claim 1, wherein, The fastening mechanism (2) further includes a positioning sleeve (22), the positioning sleeve (22) is fixedly sleeved at one end of the circular sliding groove (13) located on the outer side surface of the precast slab (1), and one end of the sliding sleeve (21) is located in the reserved vertical groove (11) and is fixedly connected with a push block (24).

3. The prefabricated building for construction projects according to claim 2, wherein A guide block (27) is fixedly embedded on the inner side surface of the reserved vertical groove (11), a guide sliding groove (26) is opened on the outer side surface of the sliding sleeve (21), and the guide block (27) extends into the guide sliding groove (26).

4. The prefabricated building for construction engineering according to claim 3, characterized in that, A first spring (25) is slidably sleeved on the bent rod (23), after the sliding sleeve (21) is pushed towards the outer side of the precast slab (1), the first spring (25) is compressed and the guide block (27) rotates the sliding sleeve (21) and the bent rod (23) by 90°.

5. The prefabricated building for construction engineering according to claim 1, characterized in that, The installation mechanism (3) further includes a metal plate (36) fixedly connected to the bottom surface of the precast slab (1), the metal plate (36) is located at the bottom end of the reserved vertical groove (11), and the metal plate (36) is penetrated by the steel cable (34).

6. The prefabricated building for construction engineering according to claim 2, wherein, The bottom surface of the push block (24) and the top surface of the inclined plane slider (37) are provided with parallel inclined planes, after the inclined plane slider (37) moves upward and contacts the push block (24), the push block (24) moves towards the outer side surface of the precast slab (1).

7. The prefabricated building for construction engineering according to claim 1, characterized in that The push columns (32) are located around the cylindrical slider (33) and are centrosymmetric with the center of the cylindrical slider (33).

8. An assembled building for construction projects according to claim 1, characterized in that, A plurality of storage sliding grooves (38) are opened on the outer side surface of the cylindrical slider (33), a clamping block (39) is slidably connected in the storage sliding grooves (38), and a second spring (310) is elastically connected between the clamping block (39) and the storage sliding grooves (38), and the second spring (310) pushes the clamping block (39) outwards.

9. The prefabricated building for construction engineering according to claim 1, characterized in that, The distance between the two installation holes (311) is equal to the distance between the reserved inserted steel bars on the construction site. A frustum ring coaxial with the installation hole (311) is fixedly connected to the top surface of the guide plate (31), and the inner hole diameter of the frustum ring is the same as that of the installation hole (311).

10. An assembled building for construction projects according to claim 1, characterized in that, Symmetrical lifting rings (12) are embedded in the top surface of the precast slab (1). A fastening clamp (35) is fixedly connected to the bottom end of the steel cable (34). The length of the fastening clamp (35) is less than the diameter of the cylindrical slider (33), and the fastening clamp (35) abuts against the bottom surface of the cylindrical slider (33).

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