Bolt type reinforcing structure for steel pipe wrapped outside net rack

Abstract

The utility model relates to the technical field of steel structure reinforcement, in particular to a net rack wrapping steel pipe bolt type reinforcing structure which comprises a newly-added outer pipe formed by splicing two semicircular pipes, the two semicircular pipes are provided with matched connecting plates, and the two semicircular pipes are fixedly connected into an integral structure through bolts arranged on the connecting plates. The newly-added outer pipe is arranged on the periphery of the existing steel pipe in a sleeved mode, a certain gap is reserved between the newly-added outer pipe and the existing steel pipe, and filling materials are poured into the gap. The steel pipe reinforcing device has the advantages that the existing steel pipe is effectively reinforced without damage, and the existing steel roof truss structure is not influenced; the structure is simple and reasonable, the prefabrication degree is high, construction is convenient and efficient, rapid construction can be achieved in the skylight operation period, uninterrupted operation is ensured, and the method is suitable for popularization.

Description

Technical Field

[0001] This utility model relates to the field of steel structure reinforcement technology, specifically to a bolt-type reinforcement structure for a space frame with steel pipe outer sheath. Background Technology

[0002] When existing subway stations are designed and constructed, seismic design is generally based solely on the codes and regulations in effect at the time. Common existing space frame roofs include steel roof trusses and roof panels supported on the steel trusses. Due to changes in building function requirements, such as replacing the roof panels (e.g., replacing the original color steel panels with aluminum-magnesium-manganese panels that offer better insulation, waterproofing, and durability), the dead load increases. Therefore, reinforcement is needed in conjunction with the overall seismic design, especially for space frame members that do not meet the calculation requirements.

[0003] If the existing steel pipes do not meet the requirements, effective supports must be set around the replacement members to restore the members to their pre-loading state before the steel pipes can be unscrewed and replaced. However, this method has a significant impact on station operations. Furthermore, since the steel roof truss is an integral load-bearing structure, removing a single steel pipe member will affect the overall load-bearing state. If a safety issue arises, it could lead to the collapse of the space frame, with extremely serious consequences.

[0004] Therefore, how to comprehensively consider factors such as design safety, tight construction time, and uninterrupted operation to reinforce the existing steel pipes of existing steel roof trusses is an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this utility model is to address the shortcomings of the prior art by providing a bolt-type reinforcement structure for a space frame with external steel pipes. By adding new steel pipes around the existing steel pipes and forming a whole, the structural performance of the existing steel pipes is improved, ensuring that the supporting load-bearing capacity of the steel roof truss meets the requirements.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A bolt-type reinforcement structure for steel pipes encasing a space frame is used to reinforce existing steel pipes in a steel roof truss. Its features include: a newly added outer pipe composed of two semi-circular pipes joined together; the two semi-circular pipes have matching connecting plates; the two semi-circular pipes are fixedly connected as a whole structure by bolts set on the connecting plates; the newly added outer pipe is sleeved around the existing steel pipe, and a certain gap is left between the newly added outer pipe and the existing steel pipe, the gap being filled with a filling material.

[0008] The semi-circular tube has pre-drilled injection holes at both ends and in the middle, which are sealed after the filling material is injected.

[0009] The end of the newly added outer tube is sealed to the existing node plate by fillet weld.

[0010] The filler material is epoxy resin.

[0011] The advantages of this utility model are: it achieves non-destructive and effective reinforcement of existing steel pipes without affecting the existing steel roof truss structure; the structure is simple and reasonable, with a high degree of prefabrication, convenient and efficient construction, and can be quickly constructed during the operation window period to ensure uninterrupted operation, making it suitable for widespread application. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the present invention;

[0013] Figure 2 This is a longitudinal view of the present invention. Detailed Implementation

[0014] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0015] like Figure 1-2 As shown in the figure, numbers 1-6 represent: existing steel pipe 1, newly added outer pipe 2, connecting plate and bolts 3, epoxy injection 4, fillet weld 5, and existing node plate 6, respectively.

[0016] Example: Combining Figure 1 and Figure 2 As shown, the bolted reinforcement structure for the steel roof truss in this embodiment is used to reinforce the existing steel pipe 1, which is a member of the existing steel roof truss. When it is necessary to improve the supporting load-bearing capacity of the steel roof truss, the existing steel pipe 1 can be reinforced using the reinforcement structure of this embodiment. In this embodiment, the steel roof truss adopts a bolted ball space frame system, and existing node plates 6 for connecting with bolted balls are provided at both ends of the existing steel pipe 1.

[0017] Combination Figure 1 and Figure 2 As shown, the reinforcement structure in this embodiment includes a new outer pipe 2 fitted around the existing steel pipe 1. The new outer pipe 2 is composed of two semi-circular pipes bolted together. Connecting plates and bolts 3 are respectively provided on the upper and lower sides of the semi-circular pipes. The two semi-circular pipes are connected by the butt joint of the bolts to form an integral structure that hugs the periphery of the existing steel pipe 1. The connecting plates and bolts 3 are evenly spaced along the longitudinal direction of the semi-circular pipes to ensure the connection performance between the two semi-circular pipes. The shape and size of the two semi-circular pipes are compatible with the shape and size of the existing steel pipe 1, and injection holes are reserved at both ends and the middle.

[0018] A certain gap is left between the newly added outer pipe 2 and the existing steel pipe 1. The gap is filled with epoxy resin 4. The newly added outer pipe 2 and the existing steel pipe 1 are connected longitudinally to form an integral structure through the epoxy resin 4, so that the existing steel pipe 1 and the newly added outer pipe 2 can work together.

[0019] In this embodiment, the existing steel pipe 1 and the newly added outer pipe 2 are connected by epoxy injection 4 to form an integral load-bearing structure. The two work together to improve the structural performance of the existing steel pipe 1, especially to improve the instability limit of the members, thereby increasing the support and bearing capacity of the steel roof truss.

[0020] In this embodiment, in order to enable the newly added outer tube 2 to participate in the stress of the steel roof truss, the newly added outer tube 2 is sealed to the existing node plate by fillet welding.

[0021] In practical applications, this embodiment includes the following process:

[0022] Based on the calculation results, steel pipes with a diameter and wall thickness no less than the required calculated value (leaving a few millimeters of gap between the inner wall and the original member) were used. The length of the existing steel pipe 1 was measured on site, and the steel pipe was cut into two semi-circular steel pipes. A connecting plate was installed with holes at certain intervals on the plate. After being fitted onto the existing steel pipe 1, the two semi-circular steel pipes were connected with bolts to form a new outer pipe 2 around the existing steel pipe 1. The new outer pipe 2 was welded to the existing node plate 6. Quick-drying adhesive was injected at the edges of the bolted connection to seal the gaps. Injection holes were reserved at both ends and in the middle of the member. The gap between the new outer pipe 2 and the existing steel pipe 1 was filled with epoxy injection adhesive 4.

[0023] In this way, the original structure can be strengthened while it continues to serve. After the epoxy grout is filled, the inner and outer walls can work together to improve the instability limit of the members and enhance their strength.

[0024] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A bolt-type reinforcement structure for a space frame with external steel pipes, used to reinforce existing steel pipes in a steel roof truss, characterized in that: The new outer tube is composed of two semi-circular tubes joined together. The two semi-circular tubes have matching connecting plates. The two semi-circular tubes are fixedly connected to each other as an integral structure by bolts set on the connecting plates. The new outer tube is sleeved around the existing steel pipe. A certain gap is left between the new outer tube and the existing steel pipe, and the gap is filled with filling material.

2. The bolt-type reinforcement structure for a space frame with external steel pipe as described in claim 1, characterized in that: The semi-circular tube has pre-drilled injection holes at both ends and in the middle, which are sealed after the filling material is injected.

3. The bolt-type reinforcement structure for a space frame with external steel pipe as described in claim 1, characterized in that: The end of the newly added outer tube is sealed to the existing node plate by fillet weld.

4. The bolt-type reinforcement structure for a space frame with an outer steel pipe as described in claim 1, characterized in that: The filler material is epoxy resin.

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