Construction method for large-span cylindrical shell grid dismantling and reinstallation

Abstract

The application provides a construction method for large-span cylinder shell net rack dismantling and reinstallation, comprising the following steps: S1: performing surface leveling and rolling treatment on the pavement layer foundation inside the cylinder shell net rack; S2: erecting a scaffold structure on the pavement layer foundation, wherein the erection of the scaffold structure comprises two stages: a first stage of erecting a starting section scaffold at the starting position of the cylinder shell net rack, after the erection of the starting section scaffold in the first stage is completed, performing cylinder shell net rack dismantling work on the starting section area, and simultaneously performing erection work of a middle section scaffold in a second stage, and erecting the middle section scaffold towards the inside of the cylinder shell net rack with the end of the starting section scaffold as a reference. The application realizes synchronous construction of cylinder shell net rack dismantling and scaffold erection by segmentally erecting the starting section scaffold and the middle section scaffold, improves construction efficiency, and simultaneously reserves a certain construction space between the dismantling span and the installation span.

Description

Technical Field

[0001] This invention relates to the field of space frame dismantling and installation technology, specifically to a construction method for dismantling and reinstalling a large-span cylindrical shell space frame. Background Technology

[0002] Shell structures combine the main characteristics of rod structures and thin-shell structures, offering rational stress distribution and the ability to span large distances. The cylindrical shell space frame is supported by multiple points around the lower chord, with bolted ball joints. The overall integrity of the upper and lower chords is good, with no intermediate support structure, allowing for zoned use according to actual needs. However, modifications to the space frame, as well as the dismantling and restoration of deformed space frames, are typically high-altitude operations, leading to high construction difficulty and significant impacts on the safety and structure of the space frame during dismantling. This is especially true for large-span space frames, where dismantling and reassembly are extremely challenging, not only hindering construction but also causing unnecessary damage to the overall cylindrical shell space frame. Summary of the Invention

[0003] The purpose of this invention is to provide a construction method that offers high safety during the dismantling and reassembly of space frames and minimizes the impact on non-dismantled space frame sections. To this end, this invention adopts the following technical solution:

[0004] A construction method for dismantling and reassembling a large-span cylindrical shell space frame includes the following steps:

[0005] S1: The surface of the foundation layer inside the cylindrical shell grid structure is leveled and compacted.

[0006] S2: Erect a scaffolding structure on the foundation of the paved layer. The erection of the scaffolding structure includes two stages: the first stage is to erect the starting section scaffolding at the starting position of the cylindrical shell space frame. After the erection of the starting section scaffolding in the first stage is completed, the cylindrical shell space frame in the starting section area is dismantled. At the same time, the erection of the intermediate section scaffolding in the second stage is carried out. The intermediate section scaffolding is built towards the inside of the cylindrical shell space frame with the end of the starting section scaffolding as the reference.

[0007] S3: A crane is arranged outside the cylindrical shell space frame, and the roof panels and purlins are removed sequentially from high to low by the crane;

[0008] S4: Dismantle the cylindrical shell frame from the highest point in the middle to the lowest point, dismantling the upper chord and the lower chord in turn, and cut and hoist the two sides of each span as a whole, while reserving supports.

[0009] S5: The reinstallation of the cylindrical shell grid frame starts from the support as the starting reference point and is installed from the supports on both sides toward the center;

[0010] S6: while the tube shell space frame is being removed and reconstructed, the construction of the installation span is carried out at the same time, and the construction space is reserved between the removal span and the installation span, and the inside of the tube shell space frame is pushed forward, and steps S3-S5 are repeated until the whole tube shell space frame is recovered.

[0011] Further, the axial direction erection length of the scaffold structure is greater than the axial length of the tube shell space frame which needs to be removed and reconstructed, and the elevation of the scaffold structure is slightly less than the elevation of the high tube shell space frame, so that the height of the scaffold structure is close to the height of the tube shell space frame.

[0012] Further, in step S2, the scaffold structure needs to be separated from the area where the belt conveyor column is located, and a plurality of columns of scaffold structures are arranged in this way, and a corridor is formed between adjacent scaffold structures, which is independent of the belt conveyor column.

[0013] Further, a connecting scaffold is arranged between adjacent scaffold structures, and the connecting scaffold is arranged staggered with the belt conveyor column.

[0014] Further, in step S4, the removal of the tube shell space frame in the middle area is carried out in the form of a tetrahedron, and before removal, the root of the tetrahedron ball is fastened with a hoisting belt, and the hoisting belt rope buckle is hung on the hoist hook.

[0015] Further, in step S5, when the tube shell space frame is reconstructed, the lower chord, the web member and the upper chord are installed in sequence.

[0016] Further, in step S6, first, three groups of removal spans of the tube shell space frame in the starting section area are removed, and the removal span and the installation span are simultaneously removed and installed.

[0017] Further, in step S2, the erection of the intermediate section scaffold is pushed forward from the starting section scaffold at both ends of the tube shell space frame to the middle of the tube shell space frame.

[0018] Further, during the removal and reconstruction of the tube shell space frame, the space frame deformation observation, the space frame axis offset observation and the crane foundation settlement observation are arranged to strengthen the fine control of the construction process.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application realizes the synchronous construction of the tube shell space frame removal and the scaffold erection by segmenting the starting section scaffold and the intermediate section scaffold, improves the construction efficiency. At the same time, a certain construction space is reserved between the removal span and the installation span, which can realize the reasonable organization of construction resources on the one hand, save construction space, improve economic benefits, and on the other hand, reduce the influence on other parts of the tube shell space frame, which is beneficial to ensure the safety of the project. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 This is a schematic diagram of the planar arrangement structure of the present invention;

[0022] Fig. 2 This is a schematic cross-sectional view of the starting section cylindrical shell grid structure of the present invention;

[0023] Fig. 3 This is a schematic cross-sectional view of the intermediate section of the cylindrical shell frame of the present invention.

[0024] The markings in the attached diagram are as follows: 1. Foundation of paving layer; 2. Purlin; 3. Upper chord; 4. Lower chord; 5. Starting section scaffold; 6. Support; 7. Intermediate section scaffold; 8. Connecting scaffold; 9. Cylindrical shell space frame; 11. Crane; 10. Conveyor belt column; 11. Crane; 12. Corridor; 13. Web member. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0026] like Figs. 1-3 As shown, a construction method for dismantling and reassembling a large-span cylindrical shell space frame includes the following steps:

[0027] S1: The surface of the foundation layer 1 inside the cylindrical shell space frame 9 is leveled and compacted, and the characteristic value of the bearing capacity of the foundation must meet the bearing requirements before the scaffolding structure is erected.

[0028] S2: Erect a scaffolding structure on the foundation 1 of the paving layer. The erection of the scaffolding structure includes two stages: In the first stage, the starting section scaffolding 5 is erected at the starting positions on both sides of the cylindrical shell space frame 9 in the axial direction. After the erection of the starting section scaffolding 5 in the first stage is completed, the cylindrical shell space frame 9 in the starting section area is dismantled. At the same time, the erection of the intermediate section scaffolding 7 in the second stage is carried out. The intermediate section scaffolding 7 is built towards the inside of the cylindrical shell space frame 9 with the end of the starting section scaffolding 5 as the reference. That is, it is advanced from the starting section area on both sides to the middle. The connecting scaffolding 8 is gradually set up when the intermediate section scaffolding 7 is erected.

[0029] S3: Cranes 11 are arranged on both sides of the outer shell space frame 9. The cranes 11 are used to remove the roof panels and purlins 2 in sequence from high to low, so that the roof panels are removed one by one from the highest point. After the high point is removed, the removal continues downward. It should be noted that the roof panels are removed first, and then the secondary purlins and main purlins of purlin 2 are removed.

[0030] S4: Remove the cylindrical shell space frame 9 from the highest point in the middle to the lowest point, remove the upper chord 3 and the lower chord 4 in turn, cut and hoist the two sides of each span as a whole, and reserve two oblique triangular grids at the bottom as supports 6.

[0031] S5: The reinstallation of the cylindrical shell grid 9 is started from the support 6 as the starting reference point, and the first chord 4, the rear web member 13, and then the upper chord 3 are sequentially installed, and the installation is from both sides of the support 6 to the center, and at the same time, the cone is assembled on the ground on both sides of the cylindrical shell grid 9 according to the installation sequence, and the assembly should be placed as close to the target installation area as possible;

[0032] S6: Firstly, three groups of the cylindrical shell grid 9 in the starting section are removed, so that there is a corresponding construction space between the installation span and the removal span during installation, and secondly, the installation span of the corresponding interval span is constructed while the removal span of each span of the cylindrical shell grid 9 is constructed, that is, the subsequent removal span and the installation span are removed and installed synchronously, and the inside of the cylindrical shell grid 9 is pushed in, and the contents in steps S3-S5 are repeated until the entire cylindrical shell grid 9 is restored.

[0033] As shown in Figs. 1-3 , in this embodiment, the cylindrical shell grid 9 is composed of a roof panel, a purlin 2, an upper chord 3, and a lower chord 4. The scaffold structure is separated from the area where the belt conveyor column 10 is located, and three columns of scaffold structures are arranged, and a corridor 12 is formed between adjacent scaffold structures, and the corridor 12 is independent of the belt conveyor column 10; in this embodiment, the axial direction of the scaffold structure is increased by 9 m in the axial direction of the cylindrical shell grid 9, and the scaffold structure is arranged close to the height position of the cylindrical shell grid 9 in the height direction, and the average height of the scaffold structure is 30 m, and the highest is 36 m; the length of the starting section scaffold 5 is 25 m, and the width of each column of the starting section scaffold 5 in the starting section area is 22.5 m.

[0034] Among them, the connecting scaffold 8 is arranged between the adjacent scaffold structures, and the connecting scaffold 8 is arranged staggered with the belt conveyor column 10, so as to increase the structural integrity of the scaffold structure.

[0035] Among them, the scaffold structure is a full-scaffold, and the deformation observation of the grid foundation, the grid, and the scaffold should be strengthened during the construction and use process, and timely analysis should be made.

[0036] Among them, in step S4, the cylindrical shell grid 9 in the middle section is removed in the form of a tetrahedron, and before removal, the root of the cone ball is fastened with a hoisting belt, and the belt buckle is hung on the hook of the crane 11. During the removal process, if the bolt cannot be unscrewed, it is cut off by gas cutting. The whole cutting and hoisting are carried out in the two side areas, and two inclined triangular grids are left at the bottom as support.

[0037] Specifically, in the process of dismounting and reassembling the cylindrical shell net rack 9, the net rack deformation observation, the net rack axis offset observation and the crane foundation settlement observation are arranged to strengthen the fine control of the construction process. At the same time, attention should be paid to the fact that the observation reference points should be arranged outside the deformation influence range, close to the observation target, and the stable positions for long-term preservation and observation should be facilitated. The monitoring points should be arranged at positions that can exactly reflect the deformation amount and deformation characteristics, and obvious marks should be arranged, and the monitoring points should not be rolled, disturbed, blocked and the like.

[0038] The above embodiments are only one of the more optimal technical solutions of the present application, and those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principles and essence of the present application, and all should be covered within the protection scope of the present application.

Claims

1. A construction method for dismantling and reassembling a large-span cylindrical shell space frame, characterized in that: The method comprises the following steps: S1: surface leveling and rolling treatment are performed on the pavement foundation (1) inside the cylindrical shell space frame (9); S2: a scaffold structure is erected on the pavement foundation (1), and the erection of the scaffold structure comprises two stages: a first stage of erecting a starting section scaffold (5) at a starting position of the cylindrical shell space frame (9), after the erection of the starting section scaffold (5) is completed, a cylindrical shell space frame (9) in the starting section area is removed, and a second stage of erecting a middle section scaffold (7) is simultaneously performed, and the middle section scaffold (7) is erected inside the cylindrical shell space frame (9) from the end of the starting section scaffold (5) as a reference; S3: a crane (11) is arranged outside the cylindrical shell space frame (9), and the roof panel and purlin (2) are sequentially removed from high to low by the crane (11); S4: the cylindrical shell space frame (9) is removed from the highest point to the lowest point, and the top chord (3) and the bottom chord (4) are sequentially removed, each span area is integrally cut and hoisted, and the support (6) is reserved; S5: the cylindrical shell space frame (9) is reassembled, and the support (6) is taken as a starting reference point, and the support (6) is installed from both sides to the center; S6: the installation span construction is performed while the cylindrical shell space frame (9) is removed and reassembled, a construction space is reserved between the removed span and the installed span, the construction space is used to advance into the cylindrical shell space frame (9), and steps S3-S5 are repeated until the entire cylindrical shell space frame (9) is recovered.

2. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 1, characterized in that: The axial direction erection length of the scaffold structure is greater than the axial length of the cylindrical shell space frame (9) that needs to be removed and reassembled, and the scaffold structure elevation is less than the cylindrical shell space frame (9) elevation.

3. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 1, characterized in that: In step S2, the scaffold structure needs to be separated from the area where the tape machine column (10) is located, and a plurality of scaffold structures are arranged in this way, and a corridor (12) is formed between adjacent scaffold structures.

4. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 3, characterized in that: A connecting scaffold (8) is arranged between adjacent scaffold structures, and the connecting scaffold (8) is arranged staggered with the tape machine column (10).

5. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 1, characterized in that: In step S4, the cylindrical shell space frame (9) in the middle area is removed in the form of a tetrahedron, the root of the tetrahedron ball is fastened by a hoisting belt before removal, and the hoisting belt rope buckle is hung on the hoist hook of the crane (11).

6. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 1, characterized in that: In step S5, the cylindrical shell space frame (9) is reassembled, and the bottom chord (4), the web member (13), and the top chord (3) are sequentially installed.

7. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 1, characterized in that: In step S6, 2-4 groups of removed spans of the cylindrical shell space frame (9) in the starting section area are first removed, and the removed spans and the installed spans are simultaneously removed and installed.

8. The construction method for dismantling and reassembling a large-span cylindrical shell grid according to claim 1, characterized in that: In step S2, the middle section scaffold (7) is erected from the starting section scaffold (5) at both ends of the cylindrical shell space frame (9) to the middle of the cylindrical shell space frame (9).

9. The construction method for dismantling and reassembling a long-span cylindrical shell space truss according to claim 1, characterized in that: In the process of removing and reassembling the cylindrical shell space frame (9), the space frame deformation observation, the space frame axis offset observation, and the crane foundation settlement observation are arranged to strengthen the fine control of the construction process.

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