Inverted pulling type construction method for large-diameter gas phase pipe in limited area

Abstract

The invention discloses an inverted pulling type construction method for a large-diameter gas-phase pipe in a limited area, which comprises the following steps of: aligning and installing the lower section of rectifying tower equipment, installing the upper section of the large-diameter gas-phase pipe on the upper section of the rectifying tower equipment on the ground, and assembling and installing the upper section of the rectifying tower equipment and the lower section of the rectifying tower equipment; and an assembly platform is erected at the reserved welded junction through a support of the gas phase pipe, horizontal transportation and vertical transportation are carried out on the lower section of the gas phase pipe in the limited area by using a winch in a matched mode through an inverted pulling method, and then assembly welding is carried out on the assembly platform erected in advance through an electric hoist. Use of a large crane in the pipeline installation process is avoided, the mechanical cost of construction is greatly reduced, the requirement for a construction site is low, the occupied space is small, and the method is suitable for construction in a limited area.

Description

Technical Field

[0001] The invention belongs to the technical field of installation of distillation tower equipment and tower-attached pipelines thereof, in particular to a reverse pulling construction method for a large-diameter gas phase pipe in a restricted area. Background Art

[0002] Polysilicon is the main raw material for manufacturing silicon polished wafers and photovoltaic cells. It is one of the most important and basic functional materials in the photovoltaic industry, semiconductor industry, and electronic information industry. At present, the dominant process for polysilicon is the modified Siemens process, which accounts for more than 95% of the production capacity. The distillation area of ​​the polysilicon project is the core of the entire polysilicon device.

[0003] At present, the construction method for installing large-diameter gas phase pipes in the distillation area of ​​large-scale polysilicon projects is to first install the distillation tower body in sections, and then install the gas phase pipes using a large crane after the gas phase pipes are assembled on the ground. This method is used to install the gas phase pipes in the distillation area of ​​the Ningxia GCL Crystal Project. The disadvantages of this construction method are: the cost of large machinery is greatly increased, the operation time of large machinery is increased, the requirements for the construction area are high, and the construction progress is slow. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for pulling out a large-diameter gas phase pipe in a restricted area. The method has low requirements on the construction area and reduces the machinery cost of the construction.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for pulling out a large-diameter gas phase pipe in a restricted area, comprising: Step 1: Align and install the lower section of the distillation tower equipment; Step 2: On the ground, install the upper section of the gas phase pipe on the upper section of the distillation tower equipment, and set up a temporary construction platform on the upper section of the distillation tower equipment; Step 3, assembling and installing the upper section of the distillation tower equipment and the lower section of the distillation tower equipment; Step 4: Install a winch on the concrete beam of the distillation tower equipment, and install a fixed pulley on the temporary construction platform; the winch is connected to the horizontal lower section of the gas phase pipe through a steel wire rope, and the winch is started to transport the lower section of the gas phase pipe horizontally to the lifting position; the winch is connected to one end of the steel wire rope, and the other end of the steel wire rope is connected to the lower section of the gas phase pipe after passing through the fixed pulley, and the winch is started to lift the lower section of the gas phase pipe to a vertical state; Step five: An electric hoist or hand hoist for hoisting the lower section of the gas phase pipe is set up on the temporary construction platform, and workers perform precise assembly and welding of the upper section and the lower section of the gas phase pipe on the temporary construction platform.

[0006] Furthermore, in step 2, the embedded plate of the gas phase pipe support at the lowest point of the upper section of the distillation tower equipment is found, the main beam of the pipeline support is installed at the embedded plate, and a temporary construction platform is set up using the main beam as support.

[0007] Furthermore, the installation limit of the upper section of the gas phase pipe at the bottom of the upper section of the distillation tower equipment is 0.5 meters above the temporary construction platform.

[0008] Furthermore, in step 4, a temporary lifting lug is provided on each side of the front end of the lower section of the gas phase pipe, and two winches are correspondingly installed on the concrete beam of the distillation tower equipment.

[0009] Furthermore, when the lower section of the gas phase pipe is transported horizontally, a crawler roller transporter is placed at the bottom of the lower section of the gas phase pipe.

[0010] Furthermore, two fixed pulleys are correspondingly arranged on the temporary construction platform.

[0011] According to the present invention, after the installation and alignment of the lower section of the large tower equipment is completed, the large-diameter tower pipeline of the upper section of the distillation tower equipment is hoisted together with the upper section of the distillation tower equipment; after the lower section of the tower pipeline is prefabricated, a winch fixed on the structure is used to carry it horizontally, and then the fixed pulley is used to hoist it, thereby avoiding the use of a large crane during the pipeline installation process and greatly reducing the mechanical cost of the construction.

[0012] The invention has low requirements on the construction site and occupies little space, so the construction method is also suitable for pipeline installation in restricted areas and environments where large cranes cannot be used for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0014] Figure 1 This is a schematic diagram of the horizontal transportation construction of the lower section of the gas phase pipe.

[0015] Figure 2 This is a schematic diagram of the vertical lifting construction of the lower section of the gas phase pipe.

[0016] In the figure, 1-lower section of gas phase pipe, 2-temporary lifting eye, 3-crawler roller transporter, 4-wire rope, 5-winch, 6-distillation tower equipment, 7-temporary construction platform, 8-fixed pulley, 9-upper section of gas phase pipe. DETAILED DESCRIPTION

[0017] The distillation area of ​​the polysilicon project is the core of the entire polysilicon device. In this embodiment, in an area of ​​only 62 meters wide and 177 meters long, the welding volume of process pipelines in the device reached 560,000 dynes. There are a large number of large-diameter pipelines in the entire internal pipe gallery. There are 20 distillation towers 100 meters high, and they are arranged in a row. The gas phase pipes of each distillation tower are large-diameter pipes, and the distance between the distillation tower and the frame is only 2.4 meters. The hoisting of the large-diameter gas phase pipe can only be carried out on one side, and the operation area is limited.

[0018] Based on the above reasons, the installation and assembly of large-diameter gas phase pipelines have brought severe challenges. The present invention improves the construction method. The overall concept is to first align and install the lower section of the distillation tower equipment, and the upper section 9 of the large-diameter gas phase pipe is installed on the ground. It is assembled and installed with the upper section of the distillation tower equipment together with the lower section of the distillation tower equipment. The bracket of the gas phase pipe is used to set up an assembly platform at the reserved weld. In the 2.4-meter-wide restricted area, the lower section of the large-diameter gas phase pipe is transported horizontally and vertically by the winch 5 using the reverse pulling method, and then the electric hoist is used to weld on the assembly platform set up in advance. This reverse pulling construction method greatly reduces the mechanical cost of the construction. The flexibility of small hoisting machinery is much higher than that of large hoisting machinery in terms of site requirements, deployment time, and hoisting speed, and the construction is less affected by weather factors, which greatly speeds up the construction progress. This construction method is suitable for installation in restricted areas and environments where large cranes cannot be used for construction.

[0019] A typical embodiment of the present invention provides a method for pulling out a large-diameter gas phase pipe in a restricted area, which includes the following steps 1 to 5.

[0020] Step 1: Align and install the lower section of the distillation tower equipment.

[0021] After the distillation tower equipment arrives at the site, the hoisting and alignment of the lower section of the distillation tower equipment is carried out normally.

[0022] Step 2: Install the large-diameter gas phase pipe in the upper section of the distillation tower on the ground and set up a temporary construction platform 7.

[0023] According to the pipeline layout diagram and axonometric diagram, the large-diameter gas-phase pipeline of the upper section of the distillation tower equipment is prefabricated and installed on the ground before the distillation tower equipment is hoisted. That is, after the upper section of the distillation tower equipment arrives, the installation of the upper section of the tower gas-phase pipeline and its pipeline supports and hangers is started.

[0024] Then, a temporary construction platform 7 is set up on the upper part of the distillation tower equipment. In this embodiment, a temporary construction platform 7 is set up at the reserved weld using the support of the gas phase pipe, and the embedded plate of the gas phase pipe support at the lowest part of the upper part of the distillation tower equipment is found, and the pipe support frame main beam is installed at the embedded plate, and the temporary construction platform 7 is set up using the main beam as support. The size of the platform should be large enough for 2 to 3 people to operate, and a safety rope guardrail must be set up.

[0025] The installation limit of the upper section 9 of the gas phase pipe at the bottom of the upper section of the distillation tower equipment is 0.5 meters above the temporary construction platform 7 to facilitate the assembly and welding of the lower section of the pipeline.

[0026] The upper section of the large-diameter gas phase pipeline, the temporary construction platform 7 and the upper section of the distillation tower equipment are combined into a whole and hoisted together.

[0027] Step three, assembling and installing the upper section of the distillation tower equipment and the lower section of the distillation tower equipment.

[0028] After the alignment of the lower section of the distillation tower is completed, and the gas phase pipeline of the upper section of the distillation tower and the temporary construction platform 7 are installed, the hoisting, assembly and welding of the upper section of the gas phase pipe 9 can be carried out.

[0029] Step 4: pull out and hoist the lower section 1 of the large-diameter gas phase pipe.

[0030] This step utilizes the winch 5 and the fixed pulley 8 to replace the large crane, and adopts the reverse pulling method to carry out the horizontal reverse transportation and vertical lifting of the lower section of the gas phase pipeline.

[0031] like Figure 1 As shown, a winch 5 is installed on the concrete beam of the distillation tower equipment, and a fixed pulley 8 is installed on the temporary construction platform 7; the winch 5 is connected to the horizontal gas phase pipe lower section 1 through a steel wire rope 4, and the winch 5 is started to transport the gas phase pipe lower section 1 horizontally to the lifting position. Figure 2 As shown, the winch 5 is connected to one end of the wire rope 4, and the other end of the wire rope 4 is connected to the lower section 1 of the gas phase pipe after passing through the fixed pulley 8. The winch 5 is started to lift the lower section 1 of the gas phase pipe to a vertical state.

[0032] In a preferred embodiment, when the upper section 9 of the gas phase pipe is transported horizontally, temporary lifting ears 2 are set on both sides of the axis of the upper section 9 of the gas phase pipe attached to the tower, two winches 5 are symmetrically installed on the concrete beam of the distillation tower equipment, and the winches 5 are connected to the temporary lifting ears 2 through steel wire ropes 4, and a crawler roller transporter 3 is placed at the bottom of the lower section 1 of the gas phase pipe.

[0033] In a preferred embodiment, when the upper section 9 of the gas phase pipe is transported vertically, two fixed pulleys 8 are symmetrically arranged on the temporary construction platform 7 .

[0034] Step 5: Welding of large-diameter gas phase pipe assemblies.

[0035] After the lower section 1 of the gas phase pipe is roughly in place, an electric hoist or a hand hoist for hoisting the lower section 1 of the gas phase pipe is set on the temporary construction platform 7, and workers perform precise assembly and welding of the upper section 9 of the gas phase pipe and the lower section 1 of the gas phase pipe on the temporary construction platform 7.

[0036] If traditional construction methods are used, the installation of the gas phase pipe requires a site 150 meters long and 10 meters wide, with the coordination of a 1,600-ton truck crane and a 160-ton truck crane, and is also affected by the climate and environment.

[0037] The present invention uses a winch 5 for horizontal reverse transportation, and then cooperates with a fixed pulley 8 for hoisting, which has low site requirements and avoids the use of large cranes during pipeline installation. If a large crane is used to assemble the lower section and the upper section of the gas phase pipe, a 600-ton truck crane and a 100-ton truck crane are required, and the distance between the distillation tower and the frame must be at least 20 meters, and the 600-ton truck crane needs to operate for a long time. The distance between the distillation tower and the frame of this project is only 2.4 meters, and the distance is narrow, so this method is obviously not applicable.

[0038] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for pulling out a large-diameter gas phase pipe in a restricted area, characterized in that: include: Step 1: Align and install the lower section of the distillation tower equipment; Step 2: On the ground, install the upper section of the gas phase pipe on the upper section of the distillation tower equipment, and set up a temporary construction platform on the upper section of the distillation tower equipment; Step 3, assembling and installing the upper section of the distillation tower equipment and the lower section of the distillation tower equipment; Step 4: Install a winch on the concrete beam of the distillation tower equipment, and install a fixed pulley on the temporary construction platform; the winch is connected to the horizontal lower section of the gas phase pipe through a steel wire rope, and the winch is started to transport the lower section of the gas phase pipe horizontally to the lifting position; the winch is connected to one end of the steel wire rope, and the other end of the steel wire rope is connected to the lower section of the gas phase pipe after passing through the fixed pulley, and the winch is started to lift the lower section of the gas phase pipe to a vertical state; Step five: An electric hoist or hand hoist for hoisting the lower section of the gas phase pipe is set up on the temporary construction platform, and workers perform precise assembly and welding of the upper section and the lower section of the gas phase pipe on the temporary construction platform.

2. The method for pulling out a large-diameter gas phase pipe in a restricted area according to claim 1 is characterized in that: In step 2, find the embedded plate of the gas phase pipe support at the lowest part of the upper part of the distillation tower equipment, install the main beam of the pipeline support at the embedded plate, and use the main beam as support to set up a temporary construction platform.

3. The method for inverted construction of a large-diameter gas phase pipe in a restricted area according to claim 1 or 2, characterized in that: The installation limit of the upper section of the gas phase pipe at the bottom of the upper section of the distillation tower equipment is 0.5 meters above the temporary construction platform.

4. The method for constructing a large-diameter gas phase pipe in a restricted area according to claim 3, characterized in that: In step 4, a temporary lifting lug is provided on each side of the front end of the lower section of the gas phase pipe, and two winches are installed correspondingly on the concrete beam of the distillation tower equipment.

5. The method for constructing a large-diameter gas phase pipe in a restricted area according to claim 4, characterized in that: When the lower section of the gas phase pipe is transported horizontally, a crawler roller transporter is placed at the bottom of the lower section of the gas phase pipe.

6. The method for constructing a large-diameter gas phase pipe in a restricted area by reverse pulling according to claim 4 or 5, characterized in that: Two fixed pulleys are correspondingly arranged on the temporary construction platform.

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