Pile foundation steel casing sinking guide device

Abstract

The utility model discloses a pile foundation steel casing sinking guide device. A working platform is horizontally arranged on a working face. The mounting frame is vertically arranged on the table top of the working platform, and one end of the steel casing body penetrates through the mounting frame and the working platform and is connected to the working platform in a sliding mode. The multiple pushing pieces are arranged on the top of the mounting frame in the circumferential direction, and the movable ends of the multiple pushing pieces can abut against or be away from the outer wall of the steel casing body in the horizontal direction. The multiple restraining pieces are arranged on the mounting frame, and the working end faces of the restraining pieces abut against the stress weak positions of the steel casing body. According to the application, the peripheral surface of the steel casing body is jointly restrained through the pushing piece and the restraining piece, so that the circumference direction of the steel casing body is always in the same straightness in the sinking process of the steel casing body, and the sinking error and deviation of the steel casing body in the construction process are reduced. And the restraining pieces are arranged, so that deformation and damage of the steel casing body in the sinking process are effectively prevented, and the construction safety is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation construction, and in particular to a pile foundation steel casing sinking guide device. Background Art

[0002] Bridge construction in riverside areas, especially in areas with significant tides and silt-covered riverbeds, is extremely difficult. While bearing its own weight, the steel casing also needs to cope with the dynamic scouring and pressure of tidal water flow, which greatly increases the difficulty of stability and precise control during the sinking process.

[0003] As a protective barrier for pile foundations, the accuracy and verticality of the steel casing’s placement are directly related to the safety and stability of the pile foundation. In a muddy riverbed, the soil has weak bearing capacity and strong fluidity, which makes it extremely difficult to adjust the plane position and verticality of the steel casing once it starts to sink. This requires the construction team to not only have superb professional skills, but also rely on advanced placement technology.

[0004] In traditional technology, the combination of vibratory hammer and crawler crane is widely used in the sinking of steel casing. The vibratory hammer reduces soil resistance through high-frequency vibration, while the crawler crane is responsible for lifting and positioning. However, faced with complex geological environments and the need to sink long casings, traditional methods have exposed obvious shortcomings. The unevenness of the soil and the instability of the tides cause the lower part of the steel casing to tilt easily, which not only increases the difficulty of pile foundation drilling, increases the risk of drill jamming and slurry leakage, but also seriously affects the construction progress and quality. Long-term tilting and uneven force are more likely to damage mechanical equipment, increase construction costs and safety risks.

[0005] Therefore, there is an urgent need for a pile foundation steel casing sinking guide device to solve the above problems. Utility Model Content

[0006] The embodiment of the present application provides a pile foundation steel casing sinking guide device, aiming to ensure that the same straightness can be maintained during the lowering process of the steel casing body while reducing safety risks.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A pile foundation steel casing sinking guide device, which is used in construction scenes in tidal mud areas, comprises a working platform, a mounting frame, a steel casing body, a plurality of jacking members and a plurality of restraining members;

[0009] The working platform is horizontally arranged on the working surface;

[0010] The mounting frame is vertically arranged on the tabletop of the working platform;

[0011] One end of the steel casing body passes through the mounting frame and the working platform and is slidably connected to the working platform;

[0012] A plurality of push members are circumferentially arranged on the top of the mounting frame, and the movable ends of the plurality of push members can horizontally contact or move away from the outer wall of the steel casing body;

[0013] A plurality of restraining members are all circumferentially arranged on the inner wall of the mounting frame, and the working end faces of the plurality of restraining members are all in contact with the stress weak point of the steel casing body.

[0014] Furthermore, the mounting frame includes multiple vertical columns and multiple horizontal columns, both ends of the multiple horizontal columns are fixedly connected to the corresponding ends of adjacent vertical columns to form a frame structure; the multiple horizontal columns located below the multiple vertical columns are fixedly arranged on the working platform.

[0015] Further, the push member includes a mounting seat and a jack;

[0016] The mounting seat is arranged on the top end surface of the horizontal column located at the top of the column, and a mounting groove is arranged on one side of the mounting seat, and the groove length direction of the mounting groove is consistent with the radial direction of the steel casing body;

[0017] The fixed end of the jack is fixedly arranged in the installation groove, and the end surface of the movable end thereof is in contact with or away from the outer wall of the steel casing body.

[0018] Further, the restraining member includes a base, a top seat, a telescopic rod, an elastic member and a ball;

[0019] The base is fixedly arranged on a side surface of the vertical column and / or horizontal column close to the steel casing body;

[0020] One end of the telescopic rod is fixedly arranged on the base, and the other end thereof extends horizontally to a side close to the steel casing body;

[0021] The top seat is fixedly arranged at one end of the telescopic rod away from the base;

[0022] The elastic member is sleeved on the periphery of the telescopic rod, and one end of the elastic member is fixedly connected to the base, and the other end of the elastic member is fixedly connected to the top seat;

[0023] The ball is arranged on a side of the top seat close to the steel casing body, and a part of the outer wall of the ball abuts against the stress weak point of the steel casing body.

[0024] Furthermore, it also includes a plurality of reinforcing ribs; one end of the plurality of reinforcing ribs is fixedly connected to a side surface of the column away from the steel casing body, and the other end thereof is fixedly connected to the table surface of the working platform to form a triangular structure.

[0025] Furthermore, a light hole for the steel casing body to pass through is penetrated on the table surface of the working platform, and the hole wall of the light hole is slidably connected to the peripheral surface of the steel casing body.

[0026] Furthermore, guide plates with arc-shaped tops are provided on at least three sides of the aperture of the light hole, one side of the guide plate close to the steel casing body abuts against the circumference of the steel casing body, and the bottom of the guide plate is fixedly connected to the working platform.

[0027] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0028] In this application, the jacking piece achieves precise control of the steel casing body through the coordinated work of the jack and the mounting seat, ensuring that the construction personnel can accurately position the steel casing body to the target position when sinking it, thereby improving the precision and accuracy of the construction. The setting of the jacking piece allows the construction personnel to adjust the working pressure and stroke of the jack according to the construction requirements, and at the same time allows the construction personnel to stay away from the moving path of the steel casing body during the operation, thereby reducing the construction risk. By using the jacking piece to perform the sinking operation of the steel casing body, the construction personnel can complete the construction task more efficiently, while reducing the labor cost and time cost, and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure in an assembled state provided by an embodiment of the present application;

[0031] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0032] Figure 3 A schematic diagram of the structure of the restraining member provided in the embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a working platform provided in an embodiment of the present application.

[0034] Icons: 10-working platform; 101-light hole; 102-guide plate; 20-steel casing body; 30-mounting frame; 31-cross column; 32-vertical column; 33-reinforcement rib; 40-thrust piece; 41-mounting seat; 42-jack; 50-restraint piece; 51-base; 52-top seat; 53-telescopic rod; 54-elastic piece; 55-ball; 60-guardrail. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0037] Combination Figure 1-Figure 4 As shown, a pile foundation steel casing sinking guide device is used in construction scenarios in tidal mud areas, including a working platform 10, a mounting frame 30, a steel casing body 20, a plurality of push members 40 and a plurality of restraining members 50; the working platform 10 is horizontally arranged on the working surface; the mounting frame 30 is vertically arranged on the table top of the working platform 10; one end of the steel casing body 20 passes through the mounting frame 30 and the working platform 10, and is slidably connected to the working platform 10; a plurality of push members 40 are circumferentially arranged on the top of the mounting frame 30, and the movable end of each push member 40 can horizontally contact or move away from the outer wall of the steel casing body 20; a plurality of restraining members 50 are respectively circumferentially arranged on the inner wall of the mounting frame 30, and the working end faces of the plurality of restraining members 50 contact the stress weak point of the steel casing body 20.

[0038] In the above scheme, it should be noted that when the lower part of the steel casing body 20 is inserted into the tidal mud section, the soft soil or thick mud will form a radial thrust on the steel casing body 20 when flowing, and the sunken part of the steel casing body 20 will continue to sink during the process, the whole steel casing body 20 will be in an inclined state, and the contact part (stress weak point) of the steel casing body 20 and the working platform 10 will produce a relative force with the working platform 10.

[0039] In the present application, the working platform 10 is fixed horizontally on the working surface (the construction working surface in the tidal mud area), and the mounting frame 30 is fixed vertically on the working platform 10, so that the steel casing body 20 can be in the same axiality with the mounting frame 30 and vertical to the table surface of the working platform 10 when the installation begins. When the position of the steel casing body 20 needs to be adjusted or pushed into the soil or mud, the movable end of the push piece 40 will contact the outer wall of the steel casing body 20, generating a horizontal thrust to move or position the steel casing body 20; during the sinking process of the steel casing body 20, the peripheral surface of the steel casing body 20 is slidably connected with the end surface of the movable end of the push piece 40, ensuring that the steel casing body 20 can be sunk normally when the push piece 40 pushes the steel casing body 20, while avoiding scratches on the peripheral surface of the steel casing body 20. The restraint 50 is circumferentially arranged on the inner wall of the mounting frame 30, and its working end face contacts the weak stress point of the steel casing body 20, which not only further ensures that the steel casing body 20 always maintains the same straightness during the vertical sinking process, but also prevents the steel casing body 20 from being deformed or damaged due to excessive stress during the jacking process. The working end face of the restraint 50 contacts the weak stress point, which can provide additional support and protection for the circumference of the steel casing body 20.

[0040] The present application uses the jacking member 40 and the restraining member 50 to restrain the circumference of the steel casing body 20, ensuring that the axial length direction of the steel casing body 20 always maintains the same straightness during the sinking process, thereby reducing the error and deviation of the sinking of the steel casing body 20 during the construction process. The setting of the restraining member 50 effectively prevents the deformation and damage of the steel casing body 20 during the sinking process, thereby improving the safety of the construction.

[0041] The mounting frame 30 includes a plurality of vertical columns 32 and a plurality of horizontal columns 31 . Both ends of the plurality of horizontal columns 31 are fixedly connected to corresponding ends of adjacent vertical columns 32 to form a frame structure. The plurality of horizontal columns 31 located below the plurality of vertical columns 32 are fixedly arranged on the working platform 10 .

[0042] In the above scheme, the mounting frame 30 is composed of a plurality of columns 32 and a plurality of cross columns 31, and the plurality of columns 32 and the plurality of cross columns 31 can form a frame structure by welding and screwing to ensure that the mounting frame 30 has high strength and good stability. Due to the high strength and stability of the mounting frame 30, it can adapt to various complex geological conditions, such as soft mud sections and hard rock sections, and the mounting frame 30 can provide strong support and guidance for the sinking of the steel casing body 20. The two ends of the plurality of cross columns 31 are respectively fixedly connected to the corresponding ends of the adjacent columns 32, so that the entire mounting frame 30 has strong rigidity in both horizontal and vertical directions and can effectively resist external forces. In addition, the mounting frame 30 can provide good guidance for the steel casing body 20 through its frame structure and the connection method with the working platform 10, so that the steel casing body 20 can move along the predetermined direction during the sinking process and accurately reach the target position, thereby improving the construction efficiency of the sinking of the steel casing body 20.

[0043] The push member 40 includes a mounting seat 41 and a jack 42; the mounting seat 41 is arranged on the top end face of the horizontal column 31 located at the top of the column 32, and a mounting groove is arranged on one side of the mounting seat 41, and the groove length direction of the mounting groove is consistent with the radial direction of the steel casing body 20; the fixed end of the jack 42 is fixedly arranged in the mounting groove, and the end face of the movable end thereof is in contact with or away from the outer wall of the steel casing body 20.

[0044] In the above scheme, the mounting seat 41 is arranged on the end face of the horizontal column 31 located at the top of the column 32, so that the push piece 40 provides horizontal thrust for the steel casing body 20. A mounting groove whose groove length direction is consistent with the radial direction of the steel casing body 20 is arranged on one side of the mounting seat 41, and the fixed end of the jack 42 is fixedly arranged in the mounting groove. When the steel casing body 20 needs to be pushed, the movable end of the jack 42 will apply pressure to the outer wall of the steel casing body 20, thereby generating horizontal thrust. By adjusting the working pressure and stroke of the jack 42, the moving speed and distance of the steel casing body 20 can be accurately controlled.

[0045] In the present application, the jacking member 40 achieves the guidance and correction of the steel casing body 20 through the cooperation of the jack 42 and the mounting seat 41, ensuring that the construction personnel can accurately position the steel casing body 20 when sinking it, thereby improving the precision and accuracy of the construction. The setting of the jacking member 40 allows the construction personnel to adjust the working pressure and stroke of the jack 42 according to the construction requirements, and at the same time allows the construction personnel to stay away from the moving path of the steel casing body 20 during the operation, thereby reducing the construction risk.

[0046] By using the push piece 40 to perform the sinking operation of the steel casing body 20, the construction personnel can complete the construction task more efficiently, while reducing the labor cost and time cost, and improving the construction efficiency. It is feasible that a guardrail 60 is fixedly arranged on the top of the mounting frame 30, and the enclosed area of ​​the guardrail 60 is larger than the top area of ​​the mounting frame 30, so as to ensure the personal safety of the construction personnel on the top of the mounting frame 30 and improve the structural modal strength of the mounting frame 30.

[0047] The restraining member 50 includes a base 51, a top seat 52, a telescopic rod 53, an elastic member 54 and a ball 55; the base 51 is fixedly arranged on a side surface of the column 32 and / or the cross column 31 close to the steel casing body 20; one end of the telescopic rod 53 is fixedly arranged on the base 51, and the other end thereof extends horizontally to the side close to the steel casing body 20; the top seat 52 is fixedly arranged on the end of the telescopic rod 53 away from the base 51; the elastic member 54 is sleeved on the periphery of the telescopic rod 53, and one end of the elastic member 54 is fixedly connected to the base 51, and the other end thereof is fixedly connected to the top seat 52; the ball 55 is rotatably arranged on one side of the top seat 52 close to the steel casing body 20, and part of the outer wall of the ball 55 abuts against the stress-weakened part of the steel casing body 20.

[0048] In the above scheme, the base 51 is fixedly arranged on a side surface of the column 32 and / or the cross column 31 close to the steel casing body 20. It can be implemented that the base 51 can be fixed on a side surface of the cross column 31 close to the steel casing body 20, a side surface of the column 32 close to the steel casing body 20, or a side surface of the connection between the cross column 31 and the column 32 close to the steel casing body 20 by welding or screw connection. One end of the telescopic rod 53 is fixedly arranged on the base 51, and the other end thereof extends horizontally to a side close to the steel casing body 20. This arrangement enables the telescopic rod 53 to be telescopically adjusted according to the movement and deformation of the steel casing body 20. The top seat 52 is fixedly arranged on an end of the telescopic rod 53 away from the base 51. The top seat 52 serves as a support structure for the ball 55, ensuring that the ball 55 can stably roll on the stress-weakened part of the steel casing body 20. The elastic member 54 is sleeved on the periphery of the telescopic rod 53, and one end thereof is fixedly connected to the base 51, and the other end is fixedly connected to the top seat 52. The setting of the elastic member 54 makes the constraint member 50 as a whole have a certain elasticity and buffering capacity, which can absorb the impact force generated by the steel casing body 20 during the sinking process, so that the peripheral surface of the steel casing body 20 is not damaged. It is feasible that the elastic member 54 in the present application is preferably a compression spring. The ball 55 is rollingly arranged on the side of the top seat 52 close to the steel casing body 20, and part of its outer wall abuts against the stress weak point of the steel casing body 20. The rolling action of the ball 55 can reduce the friction resistance between the constraint member 50 and the steel casing body 20, so that the steel casing body 20 can move more smoothly during the sinking process. At the same time, the ball 55 can also disperse the stress of the steel casing body 20 to a larger area, thereby reducing the risk of damage caused by stress concentration.

[0049] The present application also includes a plurality of reinforcing ribs 33; one end of the plurality of reinforcing ribs 33 is fixedly connected to a side of the column 32 away from the steel casing body 20, and the other end thereof is fixedly connected to the table top of the working platform 10, forming a triangular structure.

[0050] In the above scheme, one end of the plurality of reinforcing ribs 33 is fixedly connected to a side of the column 32 away from the steel casing body 20, so that the reinforcing ribs 33 can effectively transfer the supporting force of the column 32 to the working platform 10. The reinforcing ribs 33, the column 32 and the working platform 10 form a triangular structure to ensure the firmness between the reinforcing ribs 33 and the working platform 10. In the process of sinking the steel casing body 20, the reinforcing ribs 33 transmit the supporting force of the column 32 to the working platform 10, so that the entire device can withstand greater loads and impact forces. At the same time, the triangular structure of the reinforcing ribs 33 can effectively resist the torsion and bending of external forces, thereby maintaining the stability and accuracy of the entire device.

[0051] A light hole 101 for the steel casing body 20 to pass through is formed on the table surface of the working platform 10 , and the hole wall of the light hole 101 is slidably connected to the circumference of the steel casing body 20 .

[0052] In the above scheme, the setting of the light hole 101 ensures that the steel casing body 20 can smoothly pass through the working platform 10 and continue to sink to the predetermined position, thereby improving construction efficiency and accuracy. Since the hole shape of the light hole 101 is slidably connected to the steel casing body 20, the steel casing body 20 will not be squeezed or deflected when passing through the working platform 10, thereby avoiding damage to the steel casing body 20 due to deformation. At the same time, it is convenient for construction personnel to observe and monitor the sinking process of the steel casing body 20, so as to timely discover and deal with potential safety hazards. It is feasible that the size of the light hole 101 is adapted to the size of the steel casing body 20.

[0053] A guide plate 102 with an arc-shaped top is provided on at least three sides of the opening of the light hole 101 . A side of the guide plate 102 close to the steel casing body 20 abuts against the circumference of the steel casing body 20 , and the bottom of the guide plate 102 is fixedly connected to the working platform 10 .

[0054] In the above scheme, the guide plate 102 is at least arranged at the opening surrounding the light hole 101 on three sides, which can effectively guide the movement trajectory of the steel casing body 20 when passing through the light hole 101. The top of the guide plate 102 is in an arc transition, which can better fit the circumference of the steel casing body 20, reduce the friction and resistance of the steel casing body 20 when sliding through the guide plate 102, and thus extend the service life of the steel casing body 20. The side of the guide plate 102 close to the steel casing body 20 abuts against the circumference of the steel casing body 20, ensuring that the steel casing body 20 will not deviate from the predetermined path when passing through the guide plate 102. The bottom of the guide plate 102 can be fixed to the working platform 10 by welding or screwing, ensuring that the guide plate 102 can withstand the impact force generated by the steel casing body 20 during the sinking process, ensuring the safety and reliability of the construction.

[0055] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0056] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A pile foundation steel casing sinking guide device, used in tidal muddy construction scenes, characterized in that: It comprises a working platform (10), a mounting frame (30), a steel casing body (20), a plurality of jacking members (40) and a plurality of restraining members (50); The working platform (10) is horizontally arranged on the working surface; The mounting frame (30) is vertically arranged on the tabletop of the working platform (10); One end of the steel casing body (20) passes through the mounting frame (30) and the working platform (10), and is slidably connected to the working platform (10); The plurality of push members (40) are all circumferentially arranged on the top of the mounting frame (30), and the movable ends of the plurality of push members (40) are all able to horizontally contact or move away from the outer wall of the steel casing body (20); The plurality of restraining members (50) are all circumferentially arranged on the inner wall of the mounting frame (30), and the working end surfaces of the restraining members (50) are all in contact with the stress-weakened portion of the steel casing body (20).

2. The pile foundation steel casing sinking guide device according to claim 1 is characterized in that: The mounting frame (30) comprises a plurality of upright posts (32) and a plurality of transverse posts (31), and the two ends of the plurality of transverse posts (31) are respectively fixedly connected to the corresponding ends of the adjacent upright posts (32) to form a frame structure; The plurality of transverse columns (31) located at the bottom of the plurality of vertical columns (32) are all fixedly arranged on the working platform (10).

3. The pile foundation steel casing sinking guide device according to claim 2 is characterized in that: The pushing member (40) comprises a mounting seat (41) and a jack (42); The mounting seat (41) is arranged on the top end surface of the horizontal column (31) located at the top of the vertical column (32), and a mounting groove is arranged on one side of the mounting seat (41), and the groove length direction of the mounting groove is consistent with the radial direction of the steel casing body (20); The fixed end of the jack (42) is fixedly arranged in the installation groove, and the end surface of the movable end thereof is in contact with or away from the outer wall of the steel casing body (20).

4. The pile foundation steel casing sinking guide device according to claim 3 is characterized in that: The restraining member (50) comprises a base (51), a top seat (52), a telescopic rod (53), an elastic member (54) and a ball (55); The base (51) is fixedly arranged on a side surface of the upright column (32) and / or the horizontal column (31) close to the steel casing body (20); One end of the telescopic rod (53) is fixedly disposed on the base (51), and the other end thereof extends horizontally toward a side close to the steel casing body (20); The top seat (52) is fixedly arranged on an end of the telescopic rod (53) away from the base (51); The elastic member (54) is sleeved on the periphery of the telescopic rod (53), and one end of the elastic member (54) is fixedly connected to the base (51), and the other end is fixedly connected to the top seat (52); The ball bearing (55) is rollingly arranged on a side of the top seat (52) close to the steel casing body (20), and a portion of the outer wall of the ball bearing (55) abuts against a stress-weakened portion of the steel casing body (20).

5. The pile foundation steel casing sinking guide device according to claim 4 is characterized in that: It also includes a plurality of reinforcing ribs (33); one end of the plurality of reinforcing ribs (33) is fixedly connected to a side surface of the column (32) away from the steel casing body (20), and the other end thereof is fixedly connected to the table surface of the working platform (10), forming a triangular structure.

6. The pile foundation steel casing sinking guide device according to claim 1, characterized in that: A light hole (101) for the steel casing body (20) to pass through is formed on the table surface of the working platform (10), and the hole wall of the light hole (101) is slidably connected to the peripheral surface of the steel casing body (20).

7. The pile foundation steel casing sinking guide device according to claim 6 is characterized in that: A guide plate (102) with an arc-shaped top is provided on at least three sides of the opening of the light hole (101); a side surface of the guide plate (102) close to the steel casing body (20) abuts against the circumference of the steel casing body (20), and a bottom thereof is fixedly connected to the working platform (10).

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