Roof steel structure reconstruction method

Abstract

The present invention relates to the field of building construction technology, and in particular to a method for rebuilding a roof steel structure. First, a construction platform is set up, and an upper support is provided on the construction platform to support the existing roof steel structure. After the existing roof and the existing roof steel structure are dismantled, concrete column heads are reinforced and sliding bearings are embedded. The position of the upper support is adjusted to support the new roof steel structure. Then, the new roof steel structure, auxiliary structure, and new roof are installed respectively, and the construction platform is dismantled. This reconstruction method makes up for the shortcomings of existing large-span truss structure roof reconstruction. Based on the stress characteristics of the large-span truss structure system, it realizes the effective connection between the dismantling of the existing roof steel structure and the installation of the new roof steel structure, and has high construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a method for rebuilding a roof steel structure. Background Art

[0002] With the continuous strengthening of China's comprehensive national strength, the construction industry in my country has developed rapidly. Large-scale sports venues are moving towards larger spans and lighter weight, with continuous innovation in structural forms. Roof steel structures are increasingly being used in modern building structures due to their lightweight structure, beautiful appearance, large spans, and steel savings. Furthermore, to accommodate performances or competitions, roof steel structures often serve as a support platform for pipelines, mechanical equipment, controllers, lighting equipment, and other equipment used in stage performances or competitions. However, as the venue's existing roof steel structure has been used for a long time, its load capacity has become limited, making it difficult to meet the requirements of the newly added shaking screen lifting stage lighting fixtures, necessitating the reconstruction of the roof steel structure within the existing building structure.

[0003] The reconstruction process includes the demolition of the existing roof steel structure and the installation of a new roof steel structure. Currently, there is no reconstruction method specifically for the roof steel structure of such a large building. If the two are constructed separately, it will obviously affect the construction efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a roof steel structure reconstruction method, which can achieve effective connection between the demolition of the existing roof steel structure and the installation of a new roof steel structure, thereby improving construction efficiency.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The roof steel structure reconstruction method includes the following steps:

[0007] S1. Set up a construction platform;

[0008] S2. Installing an upper support above the construction platform, wherein a plurality of upper supports are arranged below the existing roof steel structure to support the existing roof steel structure;

[0009] S3, demolition of existing roof;

[0010] S4. dismantling the existing roof steel structure;

[0011] S5. Reinforce the concrete column heads and embed sliding supports. Adjust the position and height of the upper supports on the construction platform according to the design drawings so that they can support the new roof steel structure.

[0012] S6. Installation of the new roof steel structure;

[0013] S7, construction of auxiliary structures;

[0014] S8, unloading the new roof steel structure;

[0015] S9: Purlin installation, then new roof installation;

[0016] S10: dismantling the construction platform.

[0017] Optionally, in step S1, before setting up the construction platform, the construction area is first divided into an internal partition and a cantilever partition, and the construction platform is located within the internal partition.

[0018] Optionally, in step S1, the construction platform includes a steel structure support platform, a scaffolding channel and a first operating scaffolding, and the scaffolding channel and the first operating scaffolding are both installed on the steel structure support platform, and the steel structure support platform includes a plurality of radial steel beams having the same direction as the trusses of the new roof steel structure and circumferential steel beams connecting the radial steel beams.

[0019] Optionally, the construction platform further includes a protective net and a hard isolation scaffolding, the protective net is arranged below the scaffolding channel, and the hard isolation scaffolding is arranged at the boundary between the internal partition and the cantilever partition.

[0020] Optionally, in step S2, the existing roof portion of the cantilever partition is removed in an order from outside to inside, and the existing roof portion of the internal partition is removed in an order from inside to outside.

[0021] Optionally, in step S4, the existing roof steel structure first dismantles the cantilever partition portion, and then dismantles the internal partition portion, and the portion of the roof steel structure located in the internal partition is dismantled in order from inside to outside.

[0022] Optionally, in step S6, the new roof steel structure includes a pressure ring and a truss arranged on the periphery of the pressure ring.

[0023] Optionally, the pressure ring is installed first, and then the truss is installed. The truss includes a radial truss arranged radially along the pressure ring and a circumferential truss arranged circumferentially. One radial truss is composed of multiple radial truss units, and one circumferential truss is composed of multiple circumferential truss units. When the truss is installed, one radial truss is installed symmetrically clockwise or counterclockwise according to the position of the pressure ring. After the adjacent radial truss is installed, the circumferential truss unit is installed, and then the next radial truss is constructed until all the trusses are installed.

[0024] Optionally, in step S8, the unloading is performed in an order from the outside to the inside.

[0025] Optionally, the unloading is carried out in multiple times. First, jacks are set to support the new roof steel structure, and then the upper support is cut off multiple times, and the unloading is repeated multiple times. The final unloading condition uses the jack. After the force is transmitted to the jack, the jacks located at different positions are synchronously and slowly unloaded multiple times.

[0026] The beneficial effects of the present invention are as follows: the roof steel structure reconstruction method used in the present invention realizes the effective connection between the demolition of the existing roof steel structure and the installation of the new roof steel structure, makes up for the deficiency of the existing large-span truss structure roof reconstruction, and makes the construction more reasonable according to the stress characteristics of the large-span truss structure system. While ensuring the smooth progress of the construction, it increases the simplicity of the workers' operation, improves the construction efficiency, and controls the project cost to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of the roof steel structure improvement in an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of an existing gymnasium in an embodiment of the present invention;

[0029] Figure 3 It is a construction area zoning map proposed in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the construction platform proposed in an embodiment of the present invention;

[0031] Figure 5 1 is a sequence diagram of dismantling an existing roof in an embodiment of the present invention (front view);

[0032] Figure 6 1. It is a diagram of the dismantling sequence of the existing roof steel structure in an embodiment of the present invention (top view);

[0033] Figure 7 This is a schematic diagram of dismantling an existing roof steel structure in an embodiment of the present invention;

[0034] Figure 8 Schematic diagram of the structure of the pressure ring and the air tower in the embodiment of the present invention;

[0035] Figure 9 This is a distribution diagram of the auxiliary structure on the new roof steel structure in an embodiment of the present invention;

[0036] Figure 10 2 is a schematic structural diagram of a rebuilt gymnasium in an embodiment of the present invention.

[0037] In the figure, 10, construction platform; 11, steel structure support platform; 11a, column; 11b, steel beam; 11c, column support; 12, scaffolding channel; 13, first operating scaffolding; 14, high stand full scaffolding; 15, steel support; 16, protective net; 17, second operating scaffolding; 20, existing roof steel structure; 30, new roof steel structure; 31, pressure ring; 32, air tower; 33, truss; 40, upper support; 50, reverse support scaffolding; 60, sliding support; 70, auxiliary structure; 71, roof purlin; 72, horseway; 73, shaking screen lamp connecting plate; 80, concrete column capital; A, first partition; B, second partition; C, third partition; D, fourth partition. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., referring to positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] Roof steel structures, due to their numerous components and the large construction workload, place high demands on site conditions, high-altitude rigidity, stability, safety factors, and precision. Therefore, appropriate construction methods are necessary for reconstruction to ensure quality and safety. Reconstruction primarily involves two steps: dismantling the existing roof steel structure and installing a new one. Given the localized deformation of long-span roof steel structures, both dismantling the existing roof steel structure and installing a new one require temporary supports. In order to set up temporary supports, it is often necessary to dismantle the lower buildings of large-span steel structures in advance. For example, when renovating the roof steel structure of a large sports stadium, the concrete of the stands needs to be dismantled first, which greatly prolongs the construction period of the entire renovation process. Moreover, due to the differences in the specific structures of the existing roof steel structure and the new roof steel structure, the temporary supports used when dismantling the existing roof steel structure may be different from the temporary supports used when installing the new roof steel structure in terms of position and height. This requires that the temporary supports be dismantled and reinstalled after the existing roof steel structure is dismantled to adapt to the new roof steel structure, further extending the construction period of the entire renovation process.

[0043] To this end, the inventors propose a roof steel structure reconstruction method, which is mainly suitable for converting an existing roof steel structure into a truss structure. The roof steel structure reconstruction method sets up a steel structure support platform and uses an upper support installed on the steel structure support platform to support the existing roof steel structure and the new roof steel structure. It only requires adjusting the position and length of the upper support after the existing roof steel structure is dismantled. Compared with dismantling temporary supports set on the ground, the construction period is greatly shortened.

[0044] The following detailed description of the steel roof structure reconstruction method proposed in the present invention uses a large gymnasium as an example. It is understood that this reconstruction method is applicable not only to large gymnasiums but also to other buildings utilizing truss structures as roofs. It should be noted that to ensure that the majority of spectator seats face the competition area, gymnasiums are generally designed to be circular or elliptical, and their steel roof structures are also designed to be circular or elliptical. Furthermore, the gymnasiums are equipped with a central competition area, a low stand area, and a high stand area.

[0045] refer to Figure 1-10As shown, in one embodiment of the present invention, a method for rebuilding a roof steel structure of a gymnasium includes the following steps:

[0046] S1. Setting up the construction platform 10: Before setting up the construction platform, the construction area is divided into an internal partition located inside the main body of the gymnasium and a cantilevered partition located outside the gymnasium according to the roof form of the gymnasium and the on-site working conditions. The internal partition can be further divided into multiple sub-partitions in order from the inside to the outside. Specifically, it can be divided into a first partition A where the air tower 32 is located, a second partition B where the competition area outside the air tower 32 and the low stands are located, and a third partition C where the high stands are located. At this time, the cantilevered partition exists as the fourth partition D at the outermost edge. The entire construction platform 10 includes a first construction platform and a second construction platform, wherein the first construction platform includes a steel structure support platform 11 and a scaffolding channel 12 and a first operating scaffolding 13 arranged on the steel structure support platform 11, which are used for the construction of the first partition A and the second partition B. Specifically, the scaffolding channel 12 mainly serves as a channel for construction workers to move on the steel structure support platform 11, and the vertically arranged operating scaffolding is used to dismantle the upper chord and diagonal web of the truss 33 constituting the existing roof steel structure 20; the second construction platform includes a high-rise full-hall scaffolding 14, an access channel and a steel support 15 arranged on the top of the high-rise full-hall scaffolding 14, and also includes a first operating scaffolding 13 arranged on the steel support 15, which is used for the construction of the third partition C. The first construction platform and the second construction platform are connected by the steel support 15. Construction workers can reach the top of the second construction platform through the access channel and then reach the first construction platform through the steel support 15.

[0047] During the erection process, a construction road is first set up leading to the competition area in the stadium, and then the steel structure support platform 11 is installed. The steel structure support platform 11 is set in the first partition A and the second partition B. The steel structure support platform 11 includes columns 11a, inter-column supports 11c and steel beams 11b. The columns 11a are fixed to the ground by expansion screws. The inter-column supports 11c connect multiple columns 11a to support the columns 11a. The steel beams 11b connect the tops of multiple columns 11a and are divided into radial steel beams and circumferential steel beams. The direction of the radial steel beams is the same as that of the trusses 33 in the new roof steel structure 30, and the circumferential steel beams connect adjacent radial steel beams. From the overall perspective, the circumferential steel beams form multiple hexagonal structures that gradually spread from the inside to the outside and form a circular or elliptical structure at the outermost edge according to the shape of the gymnasium. Multiple radial steel beams respectively pass through the angles of the hexagonal structures formed by the circumferential steel beams.

[0048] During construction of the steel structure support platform 11, the portion located in the second section B can be constructed from the outside inward, providing sufficient operating space for the portion located in the first section A. Construction of the steel structure support platforms 11 in the first and second sections A and B can proceed simultaneously, shortening the construction period. At this point, the entire steel structure support platform 11 is completed, and the scaffolding channel 12 and operating scaffolding are installed on the steel beams 11b. Simultaneously, a second construction platform is erected in the third section C. Of course, the erection of the second construction platform can also be carried out at the same time as the erection of the steel structure support platform 11. While the second construction platform is being erected, a reverse support scaffolding 50 can also be erected in the third section C to support the existing roof steel structure 20 located in the third section C.

[0049] It should be noted that a protective net 16 is required to be installed under the scaffolding channel 12 and on the high stand full-house scaffolding 14. The area of ​​the protective net 16 under the scaffolding channel 12 at least covers the first partition A and the second partition B. Hard isolation scaffolding (not shown in the figure) is also installed at the critical edge of the third partition C and the fourth partition D to prevent construction workers from accidentally falling. The protective net 16 and the hard isolation scaffolding mainly serve as safety protection facilities for the construction platform 10. During the construction process, construction workers can also use the wire rope tied to the roof or roof to secure themselves to achieve double protection.

[0050] While S2, the scaffolding channel 12, and the first operating scaffolding 13 are being installed, upper supports 40 can be installed on the steel beams 11b according to the distribution of the existing roof steel structure 20. These supports 40 are arranged below the existing roof steel structure 20 at regular intervals to support the existing roof steel structure 20. It is understood that the upper supports 40 can be installed on either the circumferential steel beams or the radial steel beams.

[0051] S3. Demolition of the existing roof: The fourth section D will be demolished from the outside to the inside, with construction workers using lifts including but not limited to boom lifts. The first section A, second section B, and third section C will be demolished from the inside to the outside. The demolition of the first section A and second section B will be carried out by construction workers on the first construction platform, and the demolition of the third section C will be carried out by construction workers on the second construction platform. During the demolition, crowbars can be used to dismantle each small unit roof layer by layer.

[0052] S4. Demolition of existing roof steel structure 20: Figure 6The figure shows a top view of the existing roof steel structure 20. During demolition, the demolition is carried out in the order of the fourth partition D - the first partition A - the second partition B - the third partition C. Considering the structural stress characteristics of the existing roof steel structure 20 and the safety and convenience of operation, a large regular hexagon with two spans is used as the demolition unit. The truss structure that constitutes the regular hexagon (composed of six triangles) is demolished from the inside to the outside. The undemolished area can still maintain the truss 33 shape, reducing the stress during the entire roof demolition process. Considering that the components of the existing roof steel structure 20 are relatively weak and difficult to hoist as a whole, the demolition unit of the regular hexagon needs to be split again. First, the loose parts in the large triangle are removed, and then the entire piece (the truss structure that constitutes the regular hexagon, including the upper chord + diagonal web and the lower chord) is demolished. When 1-2 pieces of the entire regular hexagon remain, it is necessary to arrange diagonal braces on the steel beam 11b to support it to prevent it from breaking and falling. It can be understood that the demolished components are lifted out of the entire gymnasium from above the steel structure support platform 11 by a tower crane.

[0053] It can be understood that, because the demolition of the internal partitions of the existing roof is also carried out from the inside to the outside, the internal partitions of the existing roof steel structure 20 are also carried out from the inside to the outside, so the demolition of the existing roof and the existing roof steel structure 20 can be carried out simultaneously, but the demolition of the existing roof should be slightly faster than the demolition of the existing roof steel structure 20, so that the dismantled roof steel structure can be moved away from the construction area from the outside by the tower crane.

[0054] S5. Reinforce the gymnasium's concrete capitals 80: Steel bars are implanted into the gymnasium's concrete capitals 80 to increase the concrete surface, and sliding supports 60 are embedded. The installation of sliding supports 60 can relieve stress in the truss structure caused by the large span, high load, or thermal expansion and contraction, thereby preventing the truss structure from fracturing. The position and height of the upper supports 40 on the steel structure support platform 11 are adjusted according to the design drawings of the new roof steel structure 30, so that the upper supports 40 correspond to the new roof steel structure 30. At least one upper support 40 is installed under each component unit of the new roof steel structure 30. It can be understood that the aforementioned radial steel beams are arranged in the same direction as the trusses 33 in the new roof steel structure 30, primarily because the trusses 33 bear more concentrated forces and the upper supports 40 bear greater loads during the subsequent unloading process of the new roof steel structure 30. Therefore, more upper supports 40 are installed on the radial steel beams to provide more support.

[0055] S6. Installation of the new roof steel structure 30: As mentioned above, the new roof steel structure 30 is a truss structure. The new roof steel structure 30 specifically includes a pressure ring 31 and trusses 33 arranged around the outer periphery of the pressure ring 31. The installation steps include:

[0056] S61. Installation of the pressure ring 31 and the air tower 32: Install a second vertical operating scaffolding 17 on the steel beam 11b to install the pressure ring 31 and the air tower 32. The construction sequence of the pressure ring 31 is from inside to outside and from bottom to top. During the installation process, diagonal braces can be used to support the pressure ring rods that constitute the pressure ring 31.

[0057] S62. Installation of truss 33: truss 33 includes radial trusses arranged radially and circumferential trusses arranged circumferentially, and a radial truss is composed of multiple radial truss units, and a circumferential truss is composed of multiple circumferential truss units. When installing truss 33, a radial truss is installed symmetrically clockwise or counterclockwise according to the position of pressure ring 31, and the truss unit is hoisted from outside the gymnasium to the pre-installation position above the construction platform 10 by a tower crane for installation. After the adjacent radial trusses are installed, the circumferential truss unit is installed, and then the next radial truss is constructed until the entire truss structure is installed.

[0058] S7. Construction of accessory structure 70: The accessory structure 70 here mainly refers to the horseway 72, roof purlin 71, shaking screen lamp connecting plate 73, etc. The construction of the accessory structure 70 belongs to the existing technology and will not be described in detail here.

[0059] S8. Unloading of the new roof steel structure 30: Unloading is carried out multiple times in the order of the third partition C - the second partition B - the first partition A. The specific unloading process is as follows:

[0060] First, a jack is set on the outside of the pressure ring 31 to support the truss 33, and then the upper support 40 is cut off in multiple times. Assuming that the total unloading amount is 50 mm, a part of the upper support 40 of the third partition C can be cut off first, and the cutting length can be 15 mm. Then the second partition B and the first partition A are cut off, and the unloading is repeated multiple times. In order to control the sliding amount of the sliding support 60 and prevent the structural deviation of the new roof steel structure 30, the final unloading condition uses a jack. After the force is transmitted to the jack, the jacks at different positions are synchronously and slowly unloaded multiple times, and finally the force is completely transferred to the sliding support 60.

[0061] S9: Install the main purlins of the roof, and then install the new roof.

[0062] S10: The construction platform 10 is dismantled and the roof steel structure reconstruction is completed.

[0063] The above-mentioned roof steel structure reconstruction method utilizes the setting of the construction platform 10 to transfer the main construction operation surface to a place above the ground close to the roof, which not only facilitates the position adjustment of the upper support 40 used to support the roof steel structure, but also reserves a certain amount of construction space on the ground, so that the roof and the internal structure of the building can be reconstructed at the same time, shortening the construction period.

[0064] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A roof steel structure reconstruction method, characterized in that: The following steps are involved: S1. Divide the construction area into an internal partition and a cantilever partition, and set up a construction platform (10). The construction platform (10) is set within the range of the internal partition. The construction platform (10) includes a first construction platform and a second construction platform. The first construction platform is used for construction of the first partition where the air building (32) is located, the competition area outside the air building (32), and the second partition where the low stand is located. The second construction platform is used for construction of the third partition where the high stand is located. The first construction platform includes a steel structure support platform (11), a scaffolding channel (12), and a first operating scaffolding (13). The scaffolding channel (12) and the first operating scaffolding (13) are both installed on the steel structure support platform (11). The steel structure support platform (11) includes a plurality of radial steel beams having the same direction as the trusses (33) of the new roof steel structure (30) and a circumferential steel beam connecting the radial steel beams. S2, installing an upper support (40) above the first construction platform, wherein a plurality of the upper supports (40) are arranged below the existing roof steel structure (20) to support the existing roof steel structure (20); S3, demolition of existing roof; S4, the existing roof steel structure (20) is dismantled; S5, reinforcing the concrete column head (80) and pre-embedding the sliding support (60), adjusting the position and height of the upper support (40) on the first construction platform according to the design drawings so that it can be used to support the new roof steel structure (30); S6, installing the new roof steel structure (30); S7, construction of auxiliary structures (70); S8, the new roof steel structure (30) is unloaded; S9. Install the main purlins of the roof and then install the new roof; S10, dismantling the construction platform (10).

2. The roof steel structure reconstruction method according to claim 1, characterized in that: The construction platform (10) further comprises a protective net (16) and a hard isolation scaffolding, wherein the protective net (16) is arranged below the scaffolding passage (12), and the hard isolation scaffolding (18) is arranged at the boundary between the internal partition and the cantilever partition.

3. The roof steel structure reconstruction method according to claim 1, characterized in that: In step S2, the existing roof portion of the cantilever partition is removed in order from the outside to the inside, and the existing roof portion of the internal partition is removed in order from the inside to the outside.

4. The roof steel structure reconstruction method according to claim 1, characterized in that: In step S4, the existing roof steel structure (20) first dismantles the cantilever partition portion, and then dismantles the internal partition portion, and the portion of the roof steel structure located in the internal partition is dismantled in order from the inside to the outside.

5. The roof steel structure reconstruction method according to claim 1, characterized in that: In step S6, the new roof steel structure (30) includes a pressure ring (31) and a truss (33) arranged on the periphery of the pressure ring (31).

6. The roof steel structure reconstruction method according to claim 5, characterized in that: The pressure ring (31) is installed first, and then the truss (33) located on the periphery of the pressure ring (31) is installed. The truss (33) includes a radial truss arranged radially along the pressure ring (31) and a circumferential truss arranged circumferentially. One radial truss is composed of multiple radial truss units, and one circumferential truss is composed of multiple circumferential truss units. When the trusses are installed, one radial truss is symmetrically installed clockwise or counterclockwise according to the position of the pressure ring (31). After the adjacent radial trusses are installed, the circumferential truss units are installed, and then the next radial truss is constructed until all the trusses (33) are installed.

7. The roof steel structure reconstruction method according to claim 1, characterized in that: In step S8, the unloading is performed in order from the outside to the inside.

8. The roof steel structure reconstruction method according to claim 7, characterized in that: The unloading is performed in multiple steps. First, jacks are set to support the new roof steel structure (30). Then, the upper support (40) is cut off multiple times. The unloading is repeated multiple times. The jacks are used in the final unloading condition. After the force is transmitted to the jacks, the jacks at different positions are synchronously and slowly unloaded multiple times.

Images