Retractable and movable working platform in heat absorption tower

Abstract

The present invention belongs to the technical field of construction inside a tower, and relates to equipment for hoisting a steel structure platform inside a tower. A retractable mobile working platform inside a heat absorbing tower comprises a central ring bracket and a platform body welded to the lower part of the central ring bracket; the platform body is fan-shaped; a lifting sling is provided on the upper surface of the platform body; and a telescopic rod is provided on the periphery of the platform body. The retractable mobile working platform inside a heat absorbing tower of the present invention adopts a retractable structure, which can adapt to the needs of changing the radius of the tower body and can be repeatedly recycled; the safety and efficiency of hoisting the steel structure platform inside the heat absorbing tower are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction inside a tower and relates to hoisting equipment for a steel structure platform inside a tower. Background Art

[0002] At present, in tower-type CSP power stations, the internal steel structure platform of the heat absorption tower is used as the support platform for the molten salt pipeline and its auxiliary equipment in the tower, the support platform between electronic and electrical equipment, the support platform between HVAC equipment, and the official elevator landing platform in the tower. Due to the complex structure and the large number of layers, the design of the steel platform has high requirements for the safety, speed and efficiency of the platform construction. The earlier the construction of the platform in the tower is completed, the earlier the installation environment can be provided for the installation of other pipelines, electrical equipment and other equipment, which directly determines the project progress of the entire heat absorption tower and even the entire CSP power station. At present, the development of tower-type CSP power stations in my country is still in the exploratory stage, and there is not much basis for the hoisting of the internal steel structure platform of the heat absorption tower. In addition, the structure of the steel platform in the heat absorption tower of the Luneng CSP project is more special than that of other projects, so it is urgent to develop a new type of operating platform suitable for the current environment to meet the construction needs of this project. Summary of the invention

[0003] The purpose of the present invention is to meet the needs of construction conditions inside a heat absorption tower and to provide a work platform specially used for welding and hoisting of steel structures inside the tower.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a retractable movable working platform in a heat absorption tower, including a central ring bracket and a platform body welded to the lower part of the central ring bracket; the platform body is fan-shaped; a lifting sling is provided on the upper surface of the platform body; and a telescopic rod is provided on the periphery of the platform body.

[0005] Furthermore, the platform body is mainly composed of chords and connecting rods between the chords; one end of the chord is welded to the central ring bracket and arranged radially at intervals; adjacent chords are welded and connected by connecting rods; the chord is a hollow tube, and a telescopic rod is provided inside the chord.

[0006] Furthermore, the extension length of the telescopic rod is adjustable, and the diameter of the telescopic rod is slightly smaller than the inner diameter of the chord rod;

[0007] Furthermore, the chord includes an upper chord and a lower chord; the upper chord and the lower chord respectively form two parallel layers of structures with the connecting rod; the two layers of structures are welded together via a supporting rod.

[0008] Furthermore, the central ring bracket is composed of a plurality of circular ring channel steels and intermediate supporting channel steels which are arranged and welded together in an up-and-down manner, and the bottom of the central ring bracket is welded together with the upper and lower chords of the platform.

[0009] Furthermore, the upper surface of the platform body is paved with a double-layer steel plate mesh.

[0010] Furthermore, a wire mesh and a safety net are installed at the bottom of the platform body.

[0011] Furthermore, guide rollers are provided on the sides of the opening of the platform body.

[0012] The retractable movable working platform in the heat absorption tower of the present invention adopts a circular ring structure design, so that the surrounding area of ​​the working platform is subjected to force simultaneously when it moves up and down in the tower, and can fully cover the entire cross-section of the tower. All the layered steel platforms that need to be installed can be installed in place at one time, and the operation difficulty is reduced and the lifting efficiency is improved; the retractable structure is adopted to meet the needs of changes in the radius of the tower body and can be repeatedly recycled; the safety and efficiency of lifting the steel structure platform inside the heat absorption tower are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the retractable and movable working platform in the heat absorption tower of the present invention;

[0014] Figure 2 yes Figure 1 Schematic diagram of the AA section along the middle;

[0015] Figure 3 It is a schematic diagram of the three-dimensional structure of the retractable and movable working platform in the heat absorption tower of the present invention;

[0016] Figure 4 It is the construction status diagram of the minimum radius in the heat absorption tower;

[0017] Figure 5 This is the construction status diagram of the maximum radius inside the heat absorption tower. DETAILED DESCRIPTION

[0018] The following is a complete, clear and detailed description of the retractable and movable working platform in the heat absorption tower of the present invention in combination with the accompanying drawings and embodiments, so that those skilled in the art can better understand the technical solution of the present invention.

[0019] like Figure 1 , Figure 2 and Figure 3As shown, the retractable and movable working platform in the heat absorption tower of the present invention includes a central ring bracket 1 and a peripheral fence 2, and the upper and lower corresponding upper chords 7 and lower chords 8 are welded at the lower part of the central ring bracket 1. The upper chords 7 and the lower chords 8 are arranged in a radial fan shape. The adjacent upper chords 7 and the adjacent lower chords 8 are welded and connected by connecting rods 16. The connecting rods welded to the outer ends of the upper chords 7 and the lower chords 8 constitute the periphery of the platform. Vertical support rods 11 and oblique support rods 10 are welded between the corresponding upper chords 7 and the lower chords 8, and between the upper and lower connecting rods, respectively, so that the upper chords 7 and the lower chords 8 are connected to form a platform frame. The peripheral fence 2 is welded to the periphery of the platform, and the platform frame and the peripheral fence 2 together constitute the platform body.

[0020] like Figure 1 and 3 As shown, the central ring bracket 1 is composed of a plurality of circular channel steels 17 with the same radius stacked and welded on a fixed channel steel 18. The area inside the central ring bracket 1 is used as a hoisting channel for steel structure platform materials such as steel beams.

[0021] On the upper surface of the platform body, a steel plate mesh is laid, and workers stand on the steel plate mesh to perform welding operations. In order to prevent falling objects from high altitude and improve safety, a steel wire mesh 5 and a complete mesh 13 are installed in sequence on the lower surface of the platform body. Figure 2 shown.

[0022] A lifting sling 3 is provided on the upper surface of the platform body. A suspension ring 6 is welded on the upper surface of the upper chord 7, with a total of 4, 2 on each side. The lifting sling 3 is connected between the two suspension rings. The platform can be hoisted by connecting the lifting sling 3 with a winch wire rope.

[0023] In order to adapt to the special irregular structure of the upper and lower parts of the heat absorption tower, the platform body is provided with a telescopic rod 9, by means of which the operating radius of the platform can be increased. In order to set the telescopic rod, the upper chord rod 7 and the lower chord rod 8 are made of seamless steel pipes, and the telescopic rod 9 is made of steel pipes with a diameter slightly smaller than that of the upper chord rod 7 and the lower chord rod 8. For example, the upper chord rod 7 and the lower chord rod 8 are Φ89mm seamless steel pipes with an inner diameter of 81mm, and the telescopic rod 9 is Φ76mm seamless steel pipe with an outer diameter of 76mm. As a preferred embodiment of the present invention, Figure 2 As shown, only the telescopic rod 9 is inserted into the upper chord 7. If necessary, the telescopic rod can also be inserted into the lower chord. The clearance between the telescopic rod and the chord is small. Due to the weight of the telescopic rod and the friction force, the telescopic rod cannot move freely inside the chord. That is, in actual use, the worker needs to use force to pull out or push in the telescopic rod. In order to facilitate pulling out or pushing in the telescopic rod, a push plate 12 is welded to the outer end of the telescopic rod 9. When in use, the worker applies force to the push plate 12 with his hands or other tools to pull out or push in the telescopic rod.

[0024] When the telescopic rod 9 is extended, a wooden board or steel plate is laid on the telescopic rod 9 and fixed to the telescopic rod with wire to form an extended working platform. The radius of the extended working platform can be adjusted by adjusting the extended length of the telescopic rod according to the radius of the heat absorbing tower. The sum of the length of the telescopic rod plus the remaining length is not greater than the length of the chord.

[0025] In order to facilitate the up and down movement of the working platform in the heat absorption tower, a guide roller 4 is provided on the side of the opening of the platform body. The guide roller 4 contacts the side of the concrete structure 15 in the concrete cylinder wall 14 of the heat absorption tower, which can reduce the resistance when the platform moves up and down, making the platform move more smoothly and labor-saving.

[0026] The use method and application examples of the retractable and movable working platform in the heat absorption tower of the present invention are introduced as follows.

[0027] According to the minimum concrete wall radius R6.75m and the maximum radius R10.6m of the installation position of the steel structure platform inside the heat absorption tower, the initial minimum operating radius of the retractable mobile working platform is designed to be R6.575m. At this time, the telescopic rod is in the initial state and is retracted inside the upper chord rod. Figure 4 When the platform is constructed from top to bottom, the inner diameter of the heat absorption tower concrete wall 14 becomes larger. At this time, the telescopic rod 9 is extended outward. After the telescopic rod 9 is fully extended outward, the maximum operating radius of the original platform can be increased by 2m (at this time, the inner part of the upper chord still retains a safety length of 1m), that is, the maximum operating radius is increased to R8.575m. Figure 5 As shown. When the platform continues to construct downward, in order to avoid the extension rod extending too long and causing the platform stability of the extended part to be poor, it is necessary to weld and lengthen the platform of the initial state R6.575m on the ground, and increase the body radius to R8.4m, that is, weld a section of seamless steel pipe at the outer end of the upper chord rod 7, and then insert the original telescopic rod into the extended seamless steel pipe. The maximum extension length of the telescopic rod is still 2m. Continue to construct downward. As the inner diameter of the concrete cylinder wall increases, the maximum radius of the platform increases to R10.4m after the telescopic rod is fully extended. During the entire construction project, a certain gap is left between the platform and the inner side of the concrete cylinder wall of the heat absorption tower to facilitate the up and down movement of the platform.

[0028] The initial design weight of the work platform is 6.5t, and the maximum load weight is 1.5t (including 10 workers and some construction equipment on the upper part, without placing steel structure materials). After finite element stress analysis, it meets the load requirements.

[0029] The maximum main beam of the steel structure platform inside the heat absorption tower weighs 2.7t. During the hoisting, the platform steel beam is hoisted by a 10t winch arranged on the upper platform, and the special construction work platform is lifted and lowered by two 10t winches arranged on both sides of the upper platform. The specific hoisting process is described as follows:

[0030] (1) Before the steel structure platform in the heat absorption tower is hoisted, three 10t winches are arranged on the upper concrete platform or the top of the concrete, of which the two outer winches are used to lift the special working platform of the present invention, and the other one is used to lift the platform steel beam to be installed;

[0031] (2) Lower the wire ropes of the two 10t winches to 0m above the heat absorption tower. Use 2 Φ26 wire ropes of 3m / piece at the bottom of each wire rope, add 3 sets of 10t clasps and securely fasten them to the platform lifting slings. Before the platform is lifted, perform load tests on the 3 winches and the working platform;

[0032] (3) An electric lifting basket is arranged in advance on the north side of the working platform of the present invention, and two construction workers stand inside the electric lifting basket, and are lifted or lowered together with the working platform to monitor the lifting or lowering process of the working platform;

[0033] (4) After the working platform of the present invention is lifted to a height where the steel platform can be installed, two construction workers enter first and use no less than three 3t hand winches evenly distributed on the working platform to tie the working platform to the bottom of the upper platform steel beam that has been installed, so as to provide secondary protection for the working platform. After the protection measures are completed, the construction workers wear safety belts and anti-fall self-locking devices to enter the working platform for construction. The steel beam lifted by the 10t winch in the middle passes over the reserved lifting hole in the central ring bracket of the working platform to reach the steel beam installation height, and the construction workers begin to install the steel beam;

[0034] (5) The steel structure platform is constructed from top to bottom. The working platform can complete the construction of all the steel platforms in the cylinder from top to bottom at one time, which greatly improves the construction efficiency of the steel platform.

[0035] The use effects of the retractable movable working platform in the heat absorption tower of the present invention are as follows:

[0036] (1) The working platform can be lifted once to complete the construction of the steel platform in the cylinder from top to bottom at one time, and the working platform has a wide construction area in the cylinder, which greatly improves the operating efficiency of the steel platform in the heat absorption tower cylinder;

[0037] (2) The working platform can be used under different cylinder wall inner diameter conditions and can be extended to the construction of internal platforms of other concrete cylinder walls with variable cross-sections such as smoke towers and cooling water towers. It has strong practicality and a wide range of applications.

[0038] (3) The safety of the working platform has been greatly improved through various safety measures, such as a closed safety mesh net at the bottom of the working platform, a protective fence around the working platform, construction personnel monitoring the rise and fall of the platform in the electric hanging basket, and adding a secondary tie-down with the upper platform after the working platform is in place.

[0039] (4) The use of a dedicated working platform inside the heat absorption tower steel structure platform has obvious social and economic benefits.

Claims

1. The retractable and movable working platform in the heat absorption tower is characterized by: The platform body comprises a central ring bracket and a platform body welded to the lower part of the central ring bracket; the platform body is fan-shaped; a lifting sling is provided on the upper surface of the platform body; a telescopic rod is provided on the outer periphery of the platform body; the platform body is arranged along the outer periphery of the central ring bracket, and the platform body has a stepped irregular opening; the platform body is mainly composed of a chord and a connecting rod between the chords; one end of the chord is welded to the central ring bracket and is arranged radially and spaced apart; adjacent chords are welded and connected by connecting rods; the chord is a hollow tube, and a telescopic rod is provided inside the chord; a guide roller is provided on the side of the opening of the platform body; the extension length of the telescopic rod is adjustable, and the diameter of the telescopic rod is slightly smaller than the inner diameter of the chord; the chord comprises an upper chord and a lower chord; the upper chord and the lower chord respectively form an upper and lower layer structure parallel to each other with the connecting rod; the two-layer structure is welded together by a support rod; the central ring bracket is welded together by a circular ring channel steel and an intermediate support channel steel arranged up and down, and the bottom of the central ring bracket is welded to the upper and lower chords of the platform.

2. The retractable and movable working platform in the heat absorption tower according to claim 1 is characterized in that: The upper surface of the platform body is paved with a double-layer steel plate mesh.

3. The retractable and movable working platform in the heat absorption tower according to any one of claims 1 to 2, characterized in that: A wire mesh and a safety net are installed at the bottom of the platform body.

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