Efficient steel net rack module type dismantling method

Abstract

The present application relates to a kind of high-efficiency steel grid module dismantling method, belong to building structure dismantling technical field.The method divides whole grid into multiple construction sections, and the first several construction sections are subdivided into block units for cutting and dismantling, and the last section is set as reference span for separate processing;Before hoisting, simulate calculation is carried out on lifting point, and the type of truck crane is controlled according to that the lifting weight does not exceed 80% of rated load;Before cutting, a rope is set on the lower chord ball, and the crane can be started after cutting completely separates;When reference span is dismantled, limiting device is set to prevent support ball from sliding off, and by controlling the rotation of support ball in ball socket, it is avoided to pop out;Dismantling and ground decomposition are parallel operation, and the site is quickly turned over.The present application is scientific, hoisting is safe and controllable, reference span processing is reliable, and construction efficiency is high, and it is suitable for efficient and safe dismantling of steel grid structure with different span.

Description

Technical Field

[0001] This invention belongs to the field of building structure demolition technology, specifically a high-efficiency modular demolition method for steel space frames. Background Technology

[0002] Steel space frame structures have advantages such as light weight, large span, reasonable stress distribution, and flexible design, and are widely used in large-span buildings such as stadiums, exhibition halls, airport terminals, and industrial plants. With the advancement of urban renewal and the adjustment of building functions, a large number of existing steel space frame structures are facing demolition needs.

[0003] Existing methods for dismantling steel space frames mainly include the overall lowering method and the high-altitude dismantling method. The overall lowering method involves lowering the height of the space frame as a whole using equipment such as jacks or chain hoists before dismantling it. This method is suitable for small space frames, but for large space frames with large spans and heavy loads, it has problems such as large support reaction forces, high difficulty in synchronous control, and high construction risks. In view of this, a highly efficient modular dismantling method for steel space frames is proposed. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides: a high-efficiency modular dismantling method for steel space frames, comprising the following steps; S1. Divide the overall space frame into multiple construction sections. The first few construction sections are divided into multiple block units for cutting and dismantling. The last section is used as the reference span and divided into the middle block and the two side blocks. S2. After personnel are in place, check the integrity of the rods and ball joints at the lifting points and adjust the lifting points accordingly; S3. Before cutting the block unit, a guide rope is installed on the lower chord. The unit can only be lifted after it has been completely cut and detached. S4. Sequentially cut off the connecting rods between each construction section block unit and the main body or adjacent units, and use a truck crane to lift the block unit to the designated ground area; S5. Use a shears to dismantle and clean up the demolished block units on the ground; S6. For the reference span, multiple truck cranes are used in coordination. First, a limit device is set on the outside of the support ball to prevent slippage. Then, the connection between the middle block and the two side blocks and the support connection are cut off. After lifting the middle block, the two side blocks are slowly lowered to the ground. S7. During the removal of the reference span, control the support ball to rotate within the ball socket with the starting support as the fulcrum to prevent it from popping out.

[0005] As a preferred technical solution for a modular dismantling method of high efficiency steel space frame, in S1, the construction section is divided into 10 sections. The 1st to 9th construction sections are each divided into 7 block units A to G. The 10th construction section is divided into three sections A1, B1, and C1 as the reference span. The F and G blocks of the 9th construction section are hoisted and dismantled together with the B1 and C1 blocks of the 10th construction section.

[0006] As a preferred technical solution for a highly efficient modular dismantling method for steel space frames, in step S2, the lifting points of the block units are simulated and calculated before hoisting, and the lifting capacity of a single truck crane is controlled at ≤80% of the rated load.

[0007] As a preferred technical solution for a modular dismantling method of a high-efficiency steel space frame, in S6, the limiting device is a hoop structure formed by welding Φ16 round steel and support stiffener plate.

[0008] As a preferred technical solution for a highly efficient modular dismantling method for steel space frames, in step S3, two guide ropes are installed on the lower chord of the unit block, and pulling or lifting is strictly prohibited.

[0009] As a preferred technical solution for a highly efficient modular dismantling method for steel space frames, in step S5, the spacing between the block units after hoisting is >10m, and the vertical spacing from the cutting point is >6m.

[0010] The beneficial effects of this invention are: 1. This invention divides the overall space frame into multiple construction sections. The first few sections are further subdivided into multiple block units for cutting and dismantling, and the last section is set as a reference span and treated separately. This division method comprehensively considers the lifting weight, working space, and construction sequence, effectively avoiding the problem of excessively large single lifting units or insufficient working space, and significantly reducing the lifting risk. 2. This invention provides a limiting device (using round steel welded to the support stiffener plate to form a clamping structure) for the removal of the reference span, preventing the support ball from slipping during the removal process; at the same time, by cutting the connecting weld between the support ball and the support stiffener plate, the support ball can be controlled to rotate within the ball socket with the starting support as the fulcrum, effectively avoiding the support ball popping out and solving the major safety hazard of the reference span removal in the traditional method.

[0011] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0012] Figure 1 This is a schematic diagram before the steel frame was removed.

[0013] Figure 2 This is a schematic diagram showing the division of the entire project into 10 construction sections.

[0014] Figure 3 This is a schematic diagram of the seven block units from segment 1 to segment 9.

[0015] Figure 4This is a schematic diagram of the demolition of block A in section 1.

[0016] Figure 5 This is a schematic diagram of the demolition of the first segment B / C block unit.

[0017] Figure 6 This is a schematic diagram of the dismantling of the first D / E block unit.

[0018] Figure 7 This is a schematic diagram of the dismantling of the first segment F / G block unit.

[0019] Figure 8 This is a diagram showing the placement of the first section after its removal.

[0020] Figure 9 This is a schematic diagram of the three block units in the 10th segment.

[0021] Figure 10 This is a schematic diagram of the welding of the support stiffener plate.

[0022] Figure 11 This is a schematic diagram of the 9th segment F / G block unit and the 10th segment.

[0023] Figure 12 This is a schematic diagram of the demolition of section A1, number 10.

[0024] Figure 13 This is a schematic diagram of the demolition of section B1 / C1, number 10.

[0025] Figure 14 This is a schematic diagram of the decomposition of segment B1 / C1 in section 10.

[0026] Figure 15 A diagram illustrating the installation of seat belts.

[0027] Figure 16 This is a schematic diagram simulating the lifting point. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] The embodiments provided by the present invention will be described in detail below: A highly efficient modular dismantling method for steel space frames includes the following steps: S1, Reference Figures 1 to 3The entire structure is divided into 10 construction sections. Sections 1-9 are further divided into 7 block units (A, B, C, D, E, F, and G) for cutting and demolition. Section 10, the benchmark span, is divided into 3 sections (A1, B1, and C1) for cutting and demolition. Specifically, the F and G block units of the 9th construction section were hoisted to the ground together with the B and C block units of the 10th construction section for disassembly, and were no longer cut and dismantled separately; S2, Reference Figure 15 Personnel use a 25T top-frame crane to ascend to the dismantling position of the space frame, and attach themselves to the space frame members to be dismantled with safety belts. They check that the space frame members and ball joints at the lifting points are intact and can withstand the corresponding lifting weight; otherwise, the position of the lifting points should be adjusted to meet the safety requirements for lifting. S21, Reference Figure 16 Among them, block units A, B, C, D, E, F and G need to have their lifting points simulated before being hoisted in order to ensure the safety of the hoisting. S3, Reference Figure 4 and Figure 8 Flame cutting or mechanical cutting is used to cut off the rods connecting the first section of the space frame A block unit to the main body. It is used in conjunction with a 130T truck crane and placed on the ground outside the projection position of the space frame to be cut, with a placement spacing of >10m and a vertical distance from the cutting point of >6m. S31, Reference Figure 15 Before dismantling and cutting the unit block, two guide ropes should be installed on the lower chord of the unit block. The unit block can only be lifted after the cutting component is completely detached. Pulling is strictly prohibited. S4, Reference Figures 5-8 Following the S3 method, the B, C, D, E, F and G block units of the first section of the space frame are dismantled. After the first section of the space frame is dismantled, the 7 unit blocks dismantled from the first section of the space frame are hoisted to the rear to leave working space for the dismantling of the second section. When dismantling the second section of the space frame, the shearing machine disassembles the 7 unit blocks of the first section of the space frame, cleans up and transports the waste materials and stacks them, cleans up the site, and completes the dismantling of the main body of the space frame. S5, Reference Figure 11 Following the steps S1 to S4, dismantle and decompose the space frame sections 2-9, while retaining the F and G block units of section 9. S6, Reference Figure 10 Using two 130T truck cranes and one 260T truck crane, the three trucks were first set up with lifting points and put into lifting mode. Then, Φ16 round steel (i.e., limit steel bar) was welded to the support stiffener plate outside the support ball of the reference span to clamp the support ball and prevent the space frame from slipping during the dismantling process. S7, Reference Figures 11-13Two 130-ton trucks were used to temporarily lift block units B1 and C1 respectively. The connecting rods between the middle block unit A1 and the two side grid blocks B1 and C1 were cut off. Then the connection between the support ball and the support was cut off. Then, the grid block A was lifted and placed in the pre-prepared open space. Finally, the two side grid blocks B and C were disconnected at one end and slowly lowered to the ground. S71, Reference Figure 10 The weld connecting the support ball and the support stiffener is cut open, so that the support ball will continuously rotate around the starting support as the fulcrum during the dismantling of the space frame. In other words, the space frame support ball will continuously rotate in the support ball socket to prevent the support ball from popping out of the socket. S8, Reference Diagram Figure 14 After reducing the height of the main structure, the space frame is disassembled using a shearing machine; waste materials are cleaned up, transported and stacked, the site is cleaned up, and the dismantling of the main space frame is completed.

[0030] In the above, it is necessary to consider the reaction force at each lifting point and the lifting height, as well as the influence of the boom, when selecting a single truck crane for lifting, based on the principle that the truck crane's lifting capacity is ≤80% of its rated load: For block unit A of sections 1-9, a 130T (XCA130L8) truck crane is selected for lifting. The maximum lifting weight of the lifting point reaction force plus the sling is 6.05t, and the weight of the hook is 0.64t. Considering a dynamic load factor of 1.2, the total lifting weight is calculated as (6.05+0.64)*1.2=8.03t. The boom length of the 130T truck crane is selected as 70m, the turning radius is selected as 24m, and the lifting weight is 12.8t. The distance between the boom and the existing structure during lifting is about 2.5m>1m. The load rate is 8.03 / 12.8=63%<80%, which meets the lifting requirements. For the B and C block units of sections 1-9, a 130T (XCA130L8) truck crane will be used for lifting. The maximum lifting weight of the lifting point reaction force plus the sling is 8.11t, and the weight of the hook is 0.64t. Considering a dynamic load factor of 1.2, the total lifting weight is calculated as (8.11+0.64)*1.2=10.5t. The boom length of the 130T truck crane is selected as 65.3m, the turning radius is selected as 24m, and the lifting weight is 14.9t. The distance between the boom and the existing structure during lifting is about 3m>1m. The load rate is 10.5 / 14.9=70%<80%, which meets the lifting requirements. For block units D and E in sections 1-9, a 130T (XCA130L8) truck crane will be used for lifting. The maximum lifting weight of the lifting point reaction force plus the sling is 8.98t, and the weight of the hook is 0.64t. Considering a dynamic load factor of 1.2, the total lifting weight is calculated as (8.97+0.47)*1.2=11.54t. The boom length of the 130T truck crane is selected as 60.7m, the turning radius is selected as 20m, and the lifting weight is 18.9t. The distance between the boom and the existing structure during lifting is about 1.6m>1m. The load rate is 11.34 / 18.9=60%<80%, which meets the lifting requirements. For block units F and G in sections 1-9, a 130T (XCA130L8) truck crane will be used for lifting. The maximum lifting weight of the lifting point reaction force plus the sling is 11.61t, and the weight of the hook is 0.64t. Considering a dynamic load factor of 1.2, the total lifting weight is calculated as (11.61+0.64)*1.2=14.7t. The boom length of the 130T truck crane is selected as 60.7m, the turning radius is selected as 20m, and the lifting weight is 18.9t. The distance between the boom and the existing structure during lifting is about 5m>1m. The load rate is 14.7 / 18.9=77%<80%, which meets the lifting requirements. For the A block unit of section 10, a 260T (XCA260C) truck crane is selected for lifting. The maximum lifting point reaction force + rigging weight is 13.09t, and the hook weight is 0.7t. Considering a dynamic load factor of 1.2, the total lifting weight is calculated as (13.09 + 0.7) * 1.2 = 16.55t. The 130T truck crane boom length is selected as 63.1m, the turning radius is selected as 20m, and the lifting weight is 22.3t. The distance between the boom and the existing structure during lifting is about 2m > 1m. The load factor is 16.55 / 22.3 = 74% < 80%, which meets the lifting requirements. For blocks B and C of section 10, a 130T (XCA130L8) truck crane will be used for lifting. The maximum lifting force of the lifting point plus the weight of the rigging is 10.14t, and the weight of the hook is 0.64t. Considering a dynamic load factor of 1.2, the total lifting weight is calculated as (10.14 + 0.64) * 1.2 = 12.94t. The boom length of the 130T truck crane is selected as 60.7m, the turning radius is selected as 20m, and the lifting weight is 18.9t. The distance between the boom and the existing structure during lifting is about 2.7m > 1m. The load factor is 12.94 / 18.9 = 68% < 80%, which meets the lifting requirements.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for the modular dismantling of a high-efficiency steel space frame, characterized in that: Includes the following steps; S1. Divide the overall space frame into multiple construction sections. The first few construction sections are divided into multiple block units for cutting and dismantling. The last section is used as the reference span and divided into the middle block and the two side blocks. S2. After personnel are in place, check the integrity of the rods and ball joints at the lifting points and adjust the lifting points accordingly; S3. Before cutting the block unit, a guide rope is installed on the lower chord. The unit can only be lifted after it has been completely cut and detached. S4. Sequentially cut off the connecting rods between each construction section block unit and the main body or adjacent units, and use a truck crane to lift the block unit to the designated ground area; S5. Use a shears to dismantle and clean up the demolished block units on the ground; S6. For the reference span, multiple truck cranes are used in coordination. First, a limit device is set on the outside of the support ball to prevent slippage. Then, the connection between the middle block and the two side blocks and the support connection are cut off. After lifting the middle block, the two side blocks are slowly lowered to the ground. S7. During the removal of the reference span, control the support ball to rotate within the ball socket with the starting support as the fulcrum to prevent it from popping out.

2. The high-efficiency modular dismantling method for steel space frames according to claim 1, characterized in that: In S1, the construction section is divided into 10 sections. Sections 1 to 9 are each divided into 7 block units, A to G. Section 10 is divided into three segments, A1, B1, and C1, as the reference span. Blocks F and G of section 9 are hoisted and disassembled together with blocks B1 and C1 of section 10.

3. The high-efficiency modular dismantling method for steel space frames according to claim 1, characterized in that: In S2, the lifting points of the block unit are simulated and calculated before hoisting, and the lifting capacity of a single truck crane is controlled at ≤80% of the rated load.

4. The high-efficiency modular dismantling method for steel space frames according to claim 1, characterized in that: In S6, the limiting device is a hoop structure formed by welding Φ16 round steel and support stiffener plate.

5. The high-efficiency modular dismantling method for steel space frames according to claim 1, characterized in that: In S3, two guide ropes are installed on the lower chord of the unit block, and pulling or lifting them is strictly prohibited.

6. The high-efficiency modular dismantling method for steel space frames according to claim 1, characterized in that: In S5, the block units are placed with a spacing of >10m after being hoisted, and the vertical spacing from the cutting point is >6m.

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