Heating furnace door roller bed foundation transformation structure

Abstract

The utility model belongs to the technical field of steel rolling of fixed buildings, and relates to a heating furnace door roller way foundation transformation structure which comprises a steel beam, a heat-resistant concrete layer and high-strength shrinkage-free grouting materials, after old foundation concrete is dismantled in a charging and discharging furnace door area of a heating furnace, the steel beam is arranged in the longitudinal direction of a foundation, and a bolt hole is formed in an upper flange of the steel beam. The roller way bolts are fixed on the upper and lower flanges of the steel beam through the bolt holes; after the steel beam is in place, high-strength shrinkage-free grouting materials are filled between the two ends and the beam bottom of the steel beam and the original foundation, and tight connection between the steel beam and the original foundation is ensured; and finally, wrapping a heat-resistant concrete layer on the outer surface of the steel beam as a heat-insulating and anti-corrosion measure of the steel beam. Through the combination of the steel beam, the heat-resistant concrete layer and the high-strength shrinkage-free grouting material, the foundation stability and normal continuous work of the charging and discharging furnace door of the heating furnace in the industrial building field are ensured; through steel structure bearing, the construction period can be greatly shortened, and the reliability of the structure is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of steel rolling technology for fixed buildings, and relates to a modified structure for the foundation of a heating furnace door roller conveyor. Background Technology

[0002] During production, the charging and discharging doors of the heating furnace need to be opened frequently. After the doors are opened, the roller conveyor foundation directly opposite them is subjected to the high temperatures inside the furnace. Over time, the concrete of the roller conveyor foundation evaporates moisture, its strength decreases, it cracks, peels, and may even become unable to bear the load, necessitating reinforcement or modification of the foundation. Common methods for modifying the roller conveyor foundation of the heating furnace door include demolition and re-pouring concrete, replacing it with a heat-resistant concrete foundation, or partially replacing it with a steel structure. In recent years, based on the actual situation of large steel plants in China, the modification of the roller conveyor foundation of the heating furnace door has mainly adopted the following three schemes.

[0003] The first option is to restore the structure using the original design drawings. First, the roller conveyor equipment is dismantled, the damaged concrete is removed, and then concrete is re-poured according to the original design drawings to meet the foundation's load-bearing requirements.

[0004] The second option involves using a heat-resistant concrete foundation. First, the roller conveyor equipment is dismantled, the damaged concrete is removed, and then heat-resistant concrete is poured anew.

[0005] The third option involves partially replacing the concrete with a steel structure. After removing the damaged concrete, the surface is smoothed and replaced with a steel structure in the affected area. This method meets the usage requirements, and the steel structure can be prefabricated, reducing on-site work time. However, it requires heat insulation and corrosion protection treatment for the steel structure.

[0006] Each of the three options has its advantages and disadvantages. The first option is simple in concept and requires no special design, allowing the steel plant to implement it independently. However, it requires a long concrete curing time, is prone to cracking at the interface between the old and new concrete, and has insufficient foundation durability, potentially requiring frequent modifications and reinforcements. The second option improves the high-temperature resistance of the concrete compared to the first, but also suffers from a long concrete curing time. The third option is more suitable as a temporary production maintenance measure; for long-term use, the durability of the steel structure itself and the connection between the steel structure and the concrete is difficult to guarantee.

[0007] Because steel structures have good overall integrity and can be prefabricated in the factory, ensuring component quality and not affecting on-site production during fabrication, while heat-resistant concrete can provide heat insulation and corrosion protection, the advantages of both can be effectively combined to improve the durability of the roller conveyor foundation and the reliability of its renovation, and to shorten the foundation renovation time. Utility Model Content

[0008] In view of this, the purpose of this utility model is to provide a modified structure for the foundation of the heating furnace door roller conveyor, which shortens the modification time and improves the durability of the foundation.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a modified foundation structure for a heating furnace door roller conveyor, comprising a steel beam, a heat-resistant concrete layer, and high-strength non-shrink grout. After removing the existing foundation concrete in the loading / unloading furnace door area, a steel beam is installed longitudinally along the foundation. Bolt holes are provided on the upper flange of the steel beam, and roller conveyor bolts are fixed to the upper and lower flanges of the steel beam through these bolt holes. After the steel beam is in place, high-strength non-shrink grout is filled between its two ends and the bottom of the beam and the original foundation to ensure a tight connection between the steel beam and the original foundation. Finally, a layer of heat-resistant concrete is wrapped around the outer surface of the steel beam as a heat insulation and corrosion protection measure.

[0010] Optionally, the steel beams can be tightly bonded to the existing concrete foundation using high-strength, non-shrink grouting material to form a composite foundation modification structure.

[0011] Optionally, the load-bearing structure mainly uses steel beams, and the roller conveyor is directly connected to the steel beams with bolts to ensure the load-bearing capacity of the roller conveyor foundation.

[0012] Optionally, the steel beams can be made with an I-shaped cross section to improve their bending strength and load-bearing capacity.

[0013] Optionally, the steel beams are fabricated in sections and spliced ​​on site to accommodate the modification needs of roller conveyor foundations of different lengths.

[0014] Optionally, high-strength, non-shrink grout is filled at both ends of the steel beam and between the bottom of the beam and the original foundation. Its 1-day strength is not less than 20MPa, its 3-day strength is not less than 40MPa, and its 28-day strength is not less than 60MPa, ensuring a stable connection between the steel beam and the original foundation.

[0015] Optionally, a heat-resistant concrete layer can be wrapped around the outer surface of the steel beam, the thickness of which can be determined according to actual needs, serving the functions of heat insulation and corrosion protection.

[0016] Optionally, the roller conveyor bolts are fixed to the upper and lower flanges of the steel beam by plug welding through the bolt holes, forming a solid welded connection to ensure the stable operation of the roller conveyor on the foundation.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1) This utility model, through the combination of steel beams, heat-resistant concrete layers and high-strength non-shrink grout, ensures the foundation stability and normal continuous operation of the charging and discharging furnace door of the heating furnace in the field of industrial buildings.

[0019] 2) This utility model uses a steel structure for load-bearing, which can greatly reduce the construction period and ensure the reliability of the structure;

[0020] 3) This utility model is simple to construct, has a short construction period, and has obvious overall technical and economic advantages.

[0021] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0024] Attached reference numerals: 1. Steel beam; 2. Roller bolt; 3. Heat-resistant concrete layer; 4. High-strength non-shrink grout. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] Please see Figure 1 This is a modification structure for the foundation of a heating furnace door roller conveyor, comprising the following components:

[0029] Steel beam 1: As the main load-bearing structure, it is longitudinally installed along the foundation of the charging and discharging furnace door area of ​​the heating furnace. Steel beam 1 adopts an I-shaped cross-section design to improve its bending strength and load-bearing capacity. Bolt holes are provided on the upper flange of steel beam 1 for fixing roller bolts 2.

[0030] Roller bolt 2: It is fixed by plug welding through the bolt holes on the upper flange of the steel beam 1, forming a solid welded connection with the steel beam 1, ensuring the stable operation of the roller conveyor on the foundation.

[0031] Heat-resistant concrete layer 3: Wrapped around the outer surface of steel beam 1, it mainly serves to insulate and prevent corrosion, protecting steel beam 1 from damage caused by high temperatures and corrosion. The thickness of heat-resistant concrete layer 3 is determined according to actual needs.

[0032] High-strength non-shrink grout 4: Filled at both ends of steel beam 1 and between the bottom of the beam and the original foundation to ensure a tight connection between steel beam 1 and the original foundation. The high-strength non-shrink grout 4 has a 1-day strength of not less than 20MPa, a 3-day strength of not less than 40MPa, and a 28-day strength of not less than 60MPa, ensuring the stability and durability of the connection.

[0033] The method for modifying the foundation of the heating furnace door roller conveyor in this embodiment specifically includes the following steps:

[0034] (1) Demolition of old equipment and foundation: Demolish the roller conveyor equipment of the heating furnace steel loading machine to expose the roller conveyor foundation area that needs to be modified; remove the damaged old foundation concrete to ensure that the construction surface is clean and free of debris.

[0035] (2) Fabrication and installation of steel beams: According to the design requirements, fabricate steel beam 1 with an I-shaped cross section and open bolt holes on its upper flange; place the prefabricated steel beam 1 along the longitudinal direction of the foundation and splice it in sections to adapt to roller foundations of different lengths.

[0036] (3) Fixing the roller conveyor bolts and grouting: Weld the roller conveyor foundation bolts to the steel beam 1; Use high-strength non-shrink grout 4 to fill the gaps between the two ends of the steel beam 1 and the bottom of the beam and the original foundation to ensure that the filling is dense.

[0037] (4) Pour the heat-resistant concrete layer: Pour the heat-resistant concrete layer 3 evenly on the outer surface of the steel beam 1 to achieve the required thickness; wait for the heat-resistant concrete layer 3 to solidify completely.

[0038] (5) Complete the renovation and inspection: Inspect the entire renovation area to ensure that all connections are firm and reliable, without any omissions or defects; restore the installation of the roller conveyor equipment of the heating furnace steel loading machine, and conduct debugging and trial operation to ensure that the roller conveyor foundation renovation structure can meet the production needs.

[0039] The modified structure of the heating furnace door roller conveyor foundation proposed in this application can effectively ensure the foundation stability and normal continuous operation of the heating furnace door for loading and unloading in industrial buildings. At the same time, it is simple to construct, has a short construction period, and has significant overall technical and economic advantages.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A modified structure for the foundation of a heating furnace door roller conveyor, characterized in that: The structure includes steel beams, a heat-resistant concrete layer, and high-strength non-shrink grout. After removing the existing foundation concrete in the charging / discharging furnace door area of ​​the heating furnace, steel beams are installed longitudinally along the foundation. Bolt holes are provided on the upper flange of the steel beams, and roller bolts are fixed to the upper and lower flanges of the steel beams through these holes. After the steel beams are in place, high-strength non-shrink grout is filled between the beam ends and the bottom of the beam and the original foundation to ensure a tight connection between the steel beams and the original foundation. Finally, a layer of heat-resistant concrete is wrapped around the outer surface of the steel beams as a heat insulation and corrosion protection measure.

2. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: The steel beams are tightly bonded to the original concrete foundation using high-strength, non-shrink grout, forming a composite foundation modification structure.

3. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: The load-bearing structure mainly uses steel beams, and the roller conveyor is directly connected to the steel beams with bolts to ensure the load-bearing capacity of the roller conveyor foundation.

4. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: The steel beams use an I-shaped cross section to improve their bending strength and load-bearing capacity.

5. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: The steel beams are fabricated in sections and spliced ​​on site to accommodate the needs of roller conveyor foundation modifications of different lengths.

6. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: High-strength, non-shrink grout is filled at both ends of the steel beam and between the bottom of the beam and the original foundation. Its 1-day strength is not less than 20MPa, its 3-day strength is not less than 40MPa, and its 28-day strength is not less than 60MPa, ensuring a stable connection between the steel beam and the original foundation.

7. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: A heat-resistant concrete layer is wrapped around the outer surface of the steel beam, and its thickness is determined according to actual needs, serving the functions of heat insulation and corrosion protection.

8. The structure for modifying the foundation of a heating furnace door roller conveyor according to claim 1, characterized in that: The roller conveyor bolts are fixed to the upper and lower flanges of the steel beam by plug welding through the bolt holes, forming a solid welded connection to ensure the stable operation of the roller conveyor on the foundation.

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