Construction method for installing the large beam inside the tower by trolley horizontal transportation method

Abstract

The present invention relates to a construction method for installing the large beam inside the tower by means of horizontal transportation of a trolley. Tracks are laid inside the tower before the tower body is hoisted into place; the tower body is placed horizontally, and the tracks are laid along the length direction of the tower body, and the front end part of the tracks extends out of the tower body as the track extension end; a carrier trolley cooperating with the tracks is used to horizontally transport the large beam into the tower; first, the carrier trolley is placed at the track extension end, the large beam is hoisted onto the carrier trolley, and then the carrier trolley is pushed to transport the large beam to the installation position; the large beam is lifted by an electric hoist pre-arranged above the interior of the tower body and the large beam is connected to the connecting plate inside the tower, and each large beam is installed in sequence from the inside to the place. The present invention pre-installs the large beam of the internal parts of the tower when the tower body is placed horizontally before the tower body is in place, reduces the safety risks brought by high-altitude operations, improves the working environment in the confined space, reduces the construction difficulty, and improves the construction efficiency.

Description

Technical Field

[0001] The present invention relates to a method for installing a large beam inside a cylindrical chemical equipment, and more specifically, to a construction method for installing a large beam inside a tower by a trolley horizontal transportation method. Background Art

[0002] Modern petrochemical construction projects are developing towards refinement, diversification, large scale, and large scale. The manufacturing and installation dimensions of large cylindrical equipment such as towers are also continuously expanding. Generally, the installation workload of the steel large beam inside a large tower can reach hundreds of tons. In view of the characteristics of its large installation workload, long assembly and installation cycle, high mechanical and labor costs, and difficult control of safety risks, it is an urgent problem to seek a convenient and fast installation method.

[0003] Currently, the steel large beam inside the tower is usually hoisted piece by piece from the top of the tower by a large crane and assembled and installed in the restricted space inside the tower after the equipment is installed, positioned, and fixed. The characteristics of this method are large workload of scaffolding erection, high construction difficulty in the restricted space at high altitude, easy collision between the steel large beam and the equipment body, resulting in deformation and affecting the installation accuracy, high safety risk, and low construction efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a construction method for installing a large beam inside a tower by a trolley horizontal transportation method, so as to achieve the purpose of improving construction efficiency and safety.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A construction method for installing a large beam inside a tower by a trolley horizontal transportation method, including:

[0007] Step 1, laying tracks inside the tower before the tower body is hoisted and positioned; the tower body is placed horizontally, and the tracks are laid along the length direction of the tower body, and the front end of the tracks extends out of the tower body as the track extension end;

[0008] Step 2, using a carrier trolley cooperating with the tracks to horizontally transport the large beam into the tower; first place the carrier trolley at the track extension end, hoist the large beam onto the carrier trolley, and then push the carrier trolley to transport the large beam to the installation position;

[0009] Step 3, hoisting the large beam by an electric hoist pre-arranged above the inside of the tower body and connecting the large beam with the connecting plate inside the tower, and installing each large beam in sequence from the inside to the outside.

[0010] Further, in Step 1, inside the equipment, two tracks are laid at the lower positions on both sides of the center line in the length direction of the equipment.

[0011] Further, each track is composed of two channel steels. The distance between the two channel steels serving as the track is 500 mm, and round steel with a diameter of Ф20 mm is used for spacing between the two channel steels.

[0012] Further, the track extends 800 mm to 1000 mm outside the equipment as the outer extension end of the track, and a buffer stop is provided at the end of the outer extension end of the track.

[0013] Further, in step two, the two carrier trolleys are grouped to transport the girder.

[0014] Further, two scaffolding platforms parallel to the track are erected at a distance of 1000 mm to 1200 mm below the track as the working passage.

[0015] Further, above the working passage, two steel strands for hanging safety belts are erected parallel to the working passage.

[0016] Further, in step three, when using the electric hoist to lift the girder, one end of the girder is preliminarily connected to the connecting plate inside the tower, and then the other end of the girder is lifted or lowered to align and connect the position of the other end of the girder with the connecting plate inside the tower.

[0017] The present invention changes the traditional installation method of the support girder for the internals of large tower vessels at the construction site, transforms the difficult construction method of installing the internal part girder after the tower body is in place into pre-installing the internal part girder of the tower when the tower body is horizontally placed before the tower body is in place, reduces the safety risks brought by high-altitude operations, improves the working environment in the confined space, reduces the construction difficulty, and improves the construction efficiency, providing a convenient and fast construction method for the installation of the internal part girder of large cylindrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings here are used to provide further illustration of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitation to the present invention.

[0019] Figure 1 It is a simplified drawing of the carrier trolley and the track;

[0020] Figure 2 It is a simplified layout drawing of the carrier trolley and the track inside the tower;

[0021] Figure 3 It is a simplified layout drawing of the electric hoist inside the tower.

[0022] In the figure, 1 - track, 2 - carrier trolley, 3 - electric hoist, 4 - tower body, 5 - girder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To enable those skilled in the art to better understand the present invention, the present invention will be further described clearly and completely below in conjunction with the reference drawings and embodiments. It should be noted that, without conflict, the implementation manners in the present application and the features in the embodiments can be combined with each other.

[0024] The overall concept of the present invention is that before the tower is hoisted and positioned, when the tower body 4 is in a horizontal placement posture, the steel girder inside the tower is installed and fixed, and then it is hoisted together with the tower body 4. The main method adopted is to lay tracks inside the barrel of the tower body 4, install a flat carrier trolley, set up an electric hoisting tool, etc. With this temporary and simple tooling, the installation of the support girder of the internal parts of large tower equipment is completed safely and efficiently.

[0025] Based on this, a construction method for installing the internal girder of the tower by the trolley horizontal transportation method provided by a typical embodiment of the present invention includes the following steps.

[0026] Step 1, lay tracks 1 inside the tower before the tower body 4 is hoisted and positioned; the tower body 4 is placed horizontally, and the tracks 1 are laid along the length direction of the tower body 4, and the front end of the tracks 1 extends out of the tower body 4 as the track extension end;

[0027] Step 2, use the carrier trolley 2 that cooperates with the tracks 1 to horizontally transport the girder into the tower body 4; first place the carrier trolley 2 at the track extension end, hoist the girder 5 onto the carrier trolley 2, and then push the carrier trolley 2 to transport the girder 5 to the installation position;

[0028] Step 3, hoist the girder 5 by the electric hoist 3 pre-arranged above the inside of the tower body 4 and connect the girder 5 with the internal connection plate in the tower, and install each girder 5 in sequence from the inside to the outside.

[0029] According to the above implementation manner, the installation of the internal part girder 5 is carried out before the tower body 4 is hoisted and positioned. By setting tracks 1 and carrier trolleys 2 inside the tower, the internal part girder 5 is horizontally transported to the installation site, and then hoisted inside the tower by the electric hoist 3. After manual assembly, it is hoisted and positioned together with the whole tower. This installation method avoids the erection of a large number of vertical scaffolds inside the tower, improves the working environment in the limited space inside the tower, avoids the safety risks brought by high-altitude hoisting and installation operations, and also well avoids the collision and deformation between the girder and the equipment body, ensures the installation accuracy, and has high working efficiency and remarkable economic benefits.

[0030] The following, using the installation process of the raffinate extraction tower for the No. 3 aromatics PX unit in a petrochemical company's 40 million tons / year integrated refining and chemical project (Phase II), provides a further, clearer and more complete description of the claimed technical solution. The tower described in this example is relatively large, with multiple layers of internals girders 5, resulting in a significant installation effort. This is a typical large-scale tower internals installation project. The tower stands 113 meters tall, with diameters ranging from 13.2 meters to 7.6 meters. The tower arrived in three sections, comprising 145 layers of internals and requiring the installation of 226 girders, the heaviest of which weighs approximately 2 tons each, for a total weight of 284 tons.

[0031] According to the conditions of the equipment arriving in sections, a 3,200-ton crawler crane was selected at the construction site to undertake the lifting of the tower body 4 sections, which were assembled and welded in the air. Since the selected lifting machinery has a large tonnage, it has the ability to lift the internal beams together with the tower body 4.

[0032] Transport trolley 2: According to the weight of a single beam 5, two six-wheeled flatbed transport trolleys 2 with safe carrying capacity are manufactured.

[0033] Laying track 1: prepare 280 meters of [14 channel steel as track 1, and lay two [14 channel steel tracks at the lower position on both sides of the center line of the equipment in the longitudinal direction. Each track 1 is composed of two [14 channel steels, with a channel steel spacing of 500mm, and Ф20mm round steel is used for spacing. Track 1 extends 800mm to 1000mm outside the equipment, and a vehicle stop is installed at the end.

[0034] Set up working passage: set up two scaffolding platforms parallel to track 1 at 1000mm to 1200mm below track 1 as working passage. The scaffolding platforms are equipped with guardrails.

[0035] Add lifeline: Above the working channel, set up two lifelines parallel to the working channel, namely Ф14mm steel wire ropes, which are used to hang safety belts.

[0036] Set up electric hoists 3: Set up one electric hoist 3 with a lifting capacity of 3 tons at the top of the beam installation position and at appropriate positions on both sides (three in total) for horizontal and inclined lifting of the internal beam 5.

[0037] Construction Procedure: Two transport trolleys 2 are manually pushed to the outboard ends of the two rails 1. The upper girder 5, located at the innermost part of the tower, is selected. Under the guidance of professional crane operators, a 25-ton truck crane is used to lift the beam, and both ends of the beam 5 are gently placed simultaneously on the two transport trolleys 2. Second, the trolleys are manually pushed to transport the beam 5 to the installation location. Third, three electric hoists 3, pre-positioned above the tower, asynchronously lift and connect one end of the beam to the initial connection plate inside the tower. The other end of the beam 5 is then raised or lowered to align and connect with the connection plate. Fourth, the connecting bolts are tightened symmetrically and in stages, completing the installation of the first beam 5.

[0038] Since the layout of the carrying orbit may affect the installation position of the large beam 5 inside the tower, the large beam 5 of the internals inside the tower is installed in a backward manner from the inside to the outside. After installing the innermost first-layer large beam 5, the innermost section of the orbit 1 that may affect the installation position of the large beam 5 is removed simultaneously, and it is retracted towards the material inlet direction to the installation position of the second-layer internals large beam 5, and the installation of the second-layer internals large beam 5 is carried out.

[0039] When installing the four large beams 5 (including cross beams and vertical beams) on the same layer inside the tower, the installation sequence of first installing the cross beams and then the vertical beams is adopted. Because the installation difficulty of the horizontal cross beam is relatively small, two electric hoists 3 respectively lift the two ends of the large beam 5, and the large beam 5 can be positioned by appropriately adjusting the position. The installation difficulty of the vertical beam is relatively large. First, three electric hoists 3 respectively lift the middle and two ends of the large beam 5. After the large beam 5 leaves the carrying trolley 2, one end of the electric hoist 3 stops lifting, and the electric hoist 3 at the other end continues to lift. The electric hoist 3 in the middle intermittently lifts according to the actual situation, so that the large beam 5 is changed from horizontal to inclined until vertical during the suspended hoisting process. A small amount of position deviation can be finely adjusted by hanging a chain block on the previously installed horizontal cross beam, and finally the large beam 5 reaches the appropriate installation position and is fixed.

[0040] The scope of protection required by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention can have various deformations and modifications. Any modification, improvement, and equivalent replacement made within the concept and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for installing a large beam inside a tower by using a trolley horizontal transportation method, characterized in that, Including: Step 1: Lay tracks inside the tower before hoisting and positioning the tower body; The tower body is placed horizontally. Inside the equipment, two tracks are laid at the lower positions on both sides of the center line in the length direction of the equipment. The front end of the track extends 800 mm to 1000 mm outside the tower body as the outer extension end of the track, and a buffer stop is provided at the end of the outer extension end of the track; Two scaffolding platforms parallel to the track are erected 1000 mm to 1200 mm below the track as working passages; Above the working passage, two steel strands parallel to the working passage for hanging safety belts are erected; Step 2: Use a carrier trolley that matches the track to horizontally transport the girder into the tower; First, place the carrier trolley at the outer extension end of the track, hoist the girder onto the carrier trolley, and then push the carrier trolley to transport the girder to the installation position; Step 3: Use an electric hoist pre-arranged above the inside of the tower body to lift the girder and connect the girder to the connecting plate inside the tower, and install each girder in sequence from the inside to the outside; When installing the four girders (5) including cross beams and vertical beams on the same layer inside the tower, the installation sequence of first the cross beam and then the vertical beam is adopted. When installing the horizontal cross beam, two electric hoists (3) respectively lift the two ends of the girder (5), and the position can be adjusted to place the girder (5) in place; When installing the vertical beam, first, three electric hoists (3) respectively lift the middle and two ends of the girder (5). After the girder (5) leaves the carrier trolley (2), the electric hoist (3) at one end stops lifting, and the electric hoist (3) at the other end continues to lift. The electric hoist (3) in the middle intermittently lifts according to the actual situation, so that the girder (5) changes from horizontal to inclined until vertical during the suspended hoisting process. A chain block is hung on the previously installed horizontal cross beam for fine adjustment of the position deviation, and finally the girder (5) reaches the appropriate installation position and is fixed.

2. The construction method for installing the large beam inside the tower by the trolley horizontal transportation method according to claim 1, characterized in that: Each track is composed of two channel steels. The distance between the two channel steels serving as the track is 500 mm, and the two channel steels are fixed at intervals with Ф20 mm round steel.

3. The construction method for installing the large beam inside the tower by the trolley horizontal transportation method according to claim 2, characterized in that: In Step 2, the two said carrier trolleys are in a group to transport the girder.

4. The construction method for installing the large beam inside the tower by the trolley horizontal transportation method according to claim 1 or 3, characterized in that: In Step 3, when using the electric hoist to lift the girder, one end of the girder is preliminarily connected to the connecting plate inside the tower, and then the other end of the girder is lifted or lowered to align and connect the other end of the girder with the connecting plate inside the tower.

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