Reinforced concrete silo top variable height steel beam connecting joint

Abstract

The utility model belongs to reinforced concrete silo technical field, concretely is a kind of reinforced concrete silo storehouse top variable height steel beam connecting joint, including beam lower embedded part, support steel backing plate, variable cross-section steel beam, filling concrete and cylinder wall, its characterized in that, variable cross-section steel beam includes upper layer steel beam and lower layer steel beam, the both ends of upper layer steel beam are fixed on support steel backing plate, lower layer steel beam is set below upper layer steel beam, and there is a distance between the both ends of lower layer steel beam and cylinder wall.Compared with prior art, the utility model increases insert plate, closing plate and other structural members at beam end, reduces support end steel beam cross-section height, reduces steel beam end rotation deformation under load action, improves steel beam end concrete stress performance, reduces cracking risk.

Description

Technical Field

[0001] This utility model belongs to the field of reinforced concrete silo technology, specifically a steel beam connection node for variable height on the top of a reinforced concrete silo. Background Technology

[0002] Reinforced concrete silos are commonly used industrial structures in the metallurgical and cement industries, primarily for storing loose granular and small-lump raw materials (such as ores and cement). The roof of a reinforced concrete silo typically uses a cast-in-place reinforced concrete beam-slab structure. Construction of such structures requires full-span formwork support. Due to the considerable height of the silos, full-span formwork support suffers from disadvantages such as large formwork support height, long construction period, and high cost.

[0003] The silo roof uses steel beams instead of concrete beams, and profiled steel sheets replace formwork, bearing all construction loads and serving as formwork for the concrete slab. This method is characterized by stability, reliability, simple construction, and low cost. Chinese utility model patent CN214615736U discloses "a steel beam connection node structure for the roof of a large-diameter, high-capacity reinforced concrete silo." The silo roof has pre-reserved slots for embedding steel components. A steel pad is placed above the steel components, and a steel beam is fixed on the steel pad. A profiled steel sheet is laid on top of the steel beam, and a cast-in-place concrete slab is laid on top of the profiled steel sheet.

[0004] However, a patent with publication number CN214615736U uses a steel beam with a constant height. As the diameter of the silo increases, the height of the beam section bearing the load increases accordingly. Under the action of the load, the greater the rotational deformation at the end of the steel beam, the higher the risk of cracking of the concrete slab at the end of the steel beam.

[0005] In view of the above, this utility model is hereby proposed. Utility Model Content

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0007] To address the problem mentioned in the background art that the greater the rotational deformation of the steel beam end under load, the higher the risk of cracking of the concrete slab at the steel beam end, the present invention adopts the following technical solution.

[0008] A variable-height steel beam connection node for the top of a reinforced concrete silo includes embedded parts under the beam, support steel pads, a variable cross-section steel beam, filling concrete, and a silo wall. The variable cross-section steel beam includes an upper steel beam and a lower steel beam. The two ends of the upper steel beam are fixed to the support steel pads, and the lower steel beam is located below the upper steel beam, with a distance between the two ends of the lower steel beam and the silo wall.

[0009] Preferably, the height of the lower steel beam is less than or equal to half the height of the variable cross-section steel beam.

[0010] Preferably, the distance between the two ends of the lower steel beam and the cylinder wall is greater than or equal to half the height of the variable cross-section steel beam.

[0011] Preferably, the embedded part under the beam is embedded in the bottom surface of the beam socket in the cylinder wall, the steel plate of the embedded part under the beam is ≥20mm thick and ≥170mm wide, and the two sides of the embedded part under the beam extend at least 40mm beyond the lower flange of the variable cross-section steel beam.

[0012] Preferably, the support steel pad and the variable cross-section steel beam are welded by fillet welds with a weld height of 12mm and a weld length of not less than 100mm; the support steel pad and the embedded parts under the beam are welded by full-length side fillet welds with a weld leg height of 12mm.

[0013] Preferably, support plates and transverse stiffening ribs are provided at both ends of the upper steel beam.

[0014] Preferably, the thickness of the support end plate and the transverse stiffening rib is the web thickness of the upper steel beam + 2mm, the width of the support end plate and the transverse stiffening rib is the same as the flange width of the upper steel beam, and the support end plate and the transverse stiffening rib are welded to the upper flange, lower flange and web of the upper steel beam by fillet welds.

[0015] Preferably, an inner circumferential reinforcing bar is provided inside the cylinder wall, and the inner circumferential reinforcing bar is connected to the transverse stiffening rib by a lap weld, the length of which is not less than 5 times the diameter of the inner circumferential reinforcing bar.

[0016] Compared with existing technologies, this utility model reduces the cross-sectional height of the steel beam at the support end by adding structural components such as insertion plates and sealing plates at the beam end, thereby reducing the rotational deformation of the steel beam end under load, improving the stress performance of the concrete at the steel beam end, and reducing the risk of cracking.

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a front view of a steel beam connection node for a variable height silo roof provided in an embodiment of the present utility model.

[0019] Figure 2 A side view of a steel beam connection node for a variable height silo roof provided in an embodiment of this utility model.

[0020] Figure 3 for Figure 1 AA section view in the image.

[0021] The correspondence between the labels and component names in the attached figures is as follows:

[0022] 1. Embedded parts under beam; 2. Support steel pad; 3. Variable cross-section steel beam; 4. Filling concrete; 5. Cylinder wall; 31. Support sealing plate; 32. Transverse stiffening rib; 33. Insert plate; 34. Sealing plate; 35. Lower steel beam; 36. Upper steel beam; 51. Inner circumferential reinforcement. Detailed Implementation

[0023] 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-3 This utility model provides a connection node for a variable-height steel beam on the top of a reinforced concrete silo, including an embedded part 1 under the beam, a support steel pad 2, a variable cross-section steel beam 3, filling concrete 4, and a silo wall 5. The variable cross-section steel beam 3 includes an upper steel beam 36 and a lower steel beam 35. The two ends of the upper steel beam 36 are fixed to the support steel pad 2, and the lower steel beam 35 is located below the upper steel beam 36, with a distance between the two ends of the lower steel beam 35 and the silo wall 5.

[0025] In the above embodiment, the pre-embedded part 1 under the beam is embedded in the bottom surface of the beam socket of the cylinder wall 5. The thickness of the pre-embedded steel plate is ≥20mm, the width is ≥170mm, the width on both sides extends 40mm beyond the lower flange of the steel beam, and the width at the end extends 20mm beyond the beam end.

[0026] The aforementioned support steel plate 2 is located above the embedded part 1 under the variable cross-section steel beam 3. The thickness of the support steel plate 2 is ≥20mm, and its width extends 20mm beyond the lower flange of the steel beam on both sides and 20mm beyond the beam end. The support steel plate 2 and the variable cross-section steel beam 3 are welded together by fillet welds to form a hoisting structure. The weld height is generally 12mm, and the weld length is a fillet weld with a minimum length of 100mm. The support steel plate 2 and the embedded part 1 under the beam use a continuous side fillet weld, and the weld leg height is generally 12mm.

[0027] The aforementioned variable cross-section steel beam 3 features abrupt height changes at its ends. Specifically, the variable cross-section steel beam 3 comprises an upper steel beam 36 and a lower steel beam 35, wherein the height of the lower steel beam 35 is less than or equal to half the height of the variable cross-section steel beam 3. The distance between the two ends of the lower steel beam 35 and the cylinder wall 5 is greater than or equal to half the height of the variable cross-section steel beam 3.

[0028] In the above embodiments of this utility model, the upper steel beam 36 is respectively provided with a support sealing plate 31 and a transverse stiffening rib 32. The thickness of the support sealing plate 31 and the transverse stiffening rib 32 is t + 2mm, which is the thickness of the web plate at the beam end of the upper steel beam 36. The width is the same as the width of the flange of the upper steel beam 36. At the same time, they are welded to the upper and lower flanges and web of the upper steel beam 36 by fillet welds. The inner circumferential reinforcing bars 51 of the cylinder wall 5 within the height range of the upper steel beam 36 are connected to the transverse stiffening rib 32 by lap welds. The weld length shall not be less than 5d (d is the diameter of the reinforcing bar); the insertion depth b of the slotted plate 33 into the web of the steel beam shall be ≥ 1.5 times the length of the variable height section, and the plate thickness shall be ≥ 1.5 times the thickness of the web of the steel beam. The insertion plate 33 shall be connected to the side fillet weld of the web of the steel beam, and the weld height shall be the same as the thickness of the web of the steel beam; the thickness of the sealing plate 34 shall be the thickness t + 2mm of the web of the beam end, and it shall be welded to the insertion plate with a full penetration groove, connected to the side fillet weld of the web of the steel beam, and connected to the lower flange plate of the steel beam with a side fillet weld.

[0029] In addition, after the steel beam is installed, the filling concrete 4 will be poured with micro-expansion concrete. The concrete strength is one grade higher than that of the cylinder wall 5 concrete. The restricted expansion rate after 14 days of water curing should not be less than 0.020%.

[0030] This utility model is a connection node for a steel beam with variable height on the top of a reinforced concrete silo. By adding structural components such as an insertion plate 33 and a sealing plate 34 to the beam end, the cross-sectional height of the steel beam at the support end is reduced, the rotational deformation of the steel beam end under load is reduced, the stress performance of the concrete at the steel beam end is improved, and the risk of cracking is reduced.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

Claims

1. A variable-height steel beam connection node for the roof of a reinforced concrete silo, comprising embedded parts under the beam, support steel plates, a variable cross-section steel beam, filling concrete, and the silo wall, characterized in that, The variable cross-section steel beam includes an upper steel beam and a lower steel beam. The two ends of the upper steel beam are fixed to the support steel pads, and the lower steel beam is located below the upper steel beam, with a distance between the two ends of the lower steel beam and the cylinder wall.

2. The reinforced concrete silo roof variable height steel beam connection node according to claim 1, characterized in that, The height of the lower steel beam is less than or equal to half the height of the variable cross-section steel beam.

3. The reinforced concrete silo roof variable height steel beam connection node according to claim 2, characterized in that, The distance between the two ends of the lower steel beam and the cylinder wall is greater than or equal to half the height of the variable cross-section steel beam.

4. The reinforced concrete silo roof variable height steel beam connection node according to claim 3, characterized in that, The embedded part under the beam is embedded in the bottom surface of the beam socket in the cylinder wall. The steel plate of the embedded part under the beam is ≥20mm thick and ≥170mm wide. The two sides of the embedded part under the beam extend at least 40mm beyond the lower flange of the variable cross-section steel beam.

5. A reinforced concrete silo roof variable height steel beam connection node according to claim 4, characterized in that, The support steel pad and the variable cross-section steel beam are welded by fillet welds with a weld height of 12mm and a weld length of not less than 100mm. The support steel pad and the embedded parts under the beam are welded by full-length side fillet welds with a weld leg height of 12mm.

6. A reinforced concrete silo roof variable height steel beam connection node according to claim 5, characterized in that, Support plates and transverse stiffening ribs are installed at both ends of the upper steel beam.

7. A steel beam connection node for variable height on the roof of a reinforced concrete silo according to claim 6, characterized in that, The thickness of the support end plate and the transverse stiffening rib is the web thickness of the upper steel beam + 2mm. The width of the support end plate and the transverse stiffening rib is the same as the flange width of the upper steel beam. The support end plate and the transverse stiffening rib are welded to the upper flange, lower flange and web of the upper steel beam by fillet welds.

8. A steel beam connection node for variable height on the top of a reinforced concrete silo according to claim 7, characterized in that, The inner circumferential reinforcing bars are arranged inside the cylinder wall. The inner circumferential reinforcing bars are connected to the transverse stiffening ribs by lap welds, and the weld length is not less than 5 times the diameter of the inner circumferential reinforcing bars.

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