Double steel column combined column base structure and its construction method

Abstract

The present invention discloses a double steel column combined column base structure and a construction method thereof. The double steel column combined column base structure comprises a base plate, a first steel column, a second steel column and a connecting plate, wherein the first steel column and the second steel column are spaced apart on the base plate and form an expansion joint therebetween, and the connecting plate is connected to one end of the first steel column and the second steel column close to the base plate, and the connecting plate is located in the expansion joint. With this solution, when the first steel column and the second steel column are subjected to bending moments or shear forces in the same direction, the stiffness superposition effect of the first steel column and the second steel column can be utilized to reduce the stress of the base plate and the anchor bolts of the base, thereby avoiding the possibility of fracture of the base plate and the anchor bolts of the base due to stress concentration. When the first steel column and the second steel column are subjected to bending moments or shear forces in opposite directions, the connecting plate can reduce the forces exerted on the first steel column and the second steel column, thereby ensuring the safety of the first steel column and the second steel column.

Description

Technical Field

[0001] The invention relates to the technical field of steel column base structures, and in particular to a double steel column combined base structure and a construction method thereof. Background Art

[0002] The expansion joints of building structures are often designed as double columns. The expansion joint between the two columns is generally about 200mm. According to this size, it is impossible to achieve the independence of the column bases of the two columns. It is necessary to design a double column joint column base. In related technologies, the double column joint column base is mainly achieved by welding the steel column directly to the column base plate, and the columns above the column base plate are independent of each other. This approach cannot achieve the common force of the two columns and cannot give full play to the advantages of the superposition of the stiffness of the two columns. Summary of the invention

[0003] The embodiment of the present invention discloses a double steel column combined column base structure and a construction method thereof, which takes advantage of the superposition of double column stiffness and improves the economy, safety and feasibility of the combined design of double steel column bases at expansion joints.

[0004] In order to achieve the above-mentioned object, in the first aspect, the present invention discloses a double steel column combined column base structure, the double steel column combined column base structure comprises:

[0005] Base plate;

[0006] a first steel column, the first steel column being arranged on the bottom plate;

[0007] a second steel column, the second steel column being disposed on the bottom plate, the second steel column being spaced apart from the first steel column to form an expansion joint therebetween;

[0008] A connecting plate is connected to one end of the first steel column and the second steel column close to the bottom plate, and the connecting plate is located in the expansion joint.

[0009] As an optional implementation, in an embodiment of the present invention, the number of the connecting plates is two, and the two connecting plates are respectively connected to both sides of the first steel column and the second steel column;

[0010] The connecting plate has a connecting surface facing away from the expansion joint, the first steel column has a first surface, the second steel column has a second surface, the first surface is flush with the second surface, and the connecting surface is flush with the first surface and the second surface.

[0011] As an optional implementation, in an embodiment of the present invention, the shape of the first steel column cut along a plane perpendicular to the height direction of the first steel column is a first rectangle, the first rectangle has a first long side and a first short side, and the shape of the second steel column cut along a plane perpendicular to the height direction of the second steel column is a second rectangle, the second rectangle has a second long side and a second short side;

[0012] The height of the connecting plate h = (1.3-1.7)*d1+(1.0-1.6)*d2;

[0013] Wherein, d1 is the maximum value among the first long side, the first short side, the second long side and the second short side; d2 is the width of the expansion joint.

[0014] As an optional implementation, in an embodiment of the present invention, a groove is provided at the top end of the connecting plate, and the groove is used to disperse the stress on the connecting plate.

[0015] As an optional implementation, in an embodiment of the present invention, the width of the groove gradually decreases from the top end of the connecting plate to the bottom end of the connecting plate.

[0016] As an optional implementation, in an embodiment of the present invention, the double steel column combined column base structure further includes an inter-column ring plate, and the inter-column ring plate is sleeved on the outer circumference of the first steel column and the second steel column.

[0017] As an optional implementation, in an embodiment of the present invention, the inter-column ring plate is sleeved on the outer periphery of the first steel column and the second steel column at a position corresponding to the top end of the connecting plate, and the projection of the upper edge of the inter-column ring plate on the connecting plate is located below the groove.

[0018] As an optional implementation, in an embodiment of the present invention, the height of the inter-column ring plate is (0.2-0.3)*d1, and the thickness of the inter-column ring plate is the same as the wall thickness of the first steel column and the second steel column;

[0019] Among them, the shape of the first steel column cut along a plane perpendicular to the height direction of the first steel column is a first rectangle, the first rectangle has a first long side and a first short side, the shape of the second steel column cut along a plane perpendicular to the height direction of the second steel column is a second rectangle, the second rectangle has a second long side and a second short side; d1 is the maximum value of the first long side, the first short side, the second long side and the second short side.

[0020] As an optional implementation, in an embodiment of the present invention, a plurality of first pegs and a plurality of second pegs are respectively arranged on the surfaces of the first steel column and the second steel column facing the expansion joint, the plurality of first pegs are arranged at intervals along the height direction of the first steel column, the plurality of second pegs are arranged at intervals along the height direction of the second steel column, and each of the first pegs is arranged corresponding to each of the second pegs;

[0021] The first concrete is poured in the expansion joint, the pouring height of the first concrete in the expansion joint is close to or flush with the upper edge of the inter-column ring plate, and the first concrete covers each of the first bolts and each of the second bolts.

[0022] As an optional implementation, in an embodiment of the present invention, the second concrete and the third concrete are respectively poured into the first steel column and the second steel column, and the pouring height of the second concrete and the third concrete in the first steel column and the second steel column is close to or flush with the upper edge of the inter-column ring plate.

[0023] In a second aspect, the present invention discloses a construction method for a double steel column combined column base structure, the construction method is used to construct the double steel column combined column base structure, the construction method comprises:

[0024] Fixing the first steel column and the second steel column on the bottom plate at intervals so that the expansion joint is formed between the first steel column and the second steel column;

[0025] The connecting plate is connected to the first steel column and one end of the second steel column close to the bottom plate, so that the connecting plate is located in the expansion joint.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The double steel column combined column base structure provided by the embodiment of the present invention is provided with a connecting plate in the expansion joint formed between the first steel column and the second steel column, and the connecting plate connects the first steel column and the second steel column, so that the force between the first steel column and the second steel column can be continuous. When the first steel column and the second steel column are subjected to bending moment or shear force in the same direction, the stiffness superposition effect of the first steel column and the second steel column can be used to reduce the stress of the column base plate and the column base anchor bolt, thereby avoiding the possibility of fracture of the column base plate and the column base anchor bolt due to stress concentration. When the first steel column and the second steel column are subjected to bending moment or shear force in opposite directions, the connecting plate can reduce the stress at the root of the first steel column and the second steel column, thereby ensuring the safety of the first steel column and the second steel column. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a three-dimensional effect diagram of the double steel column combined column base structure disclosed in the embodiment of the present invention;

[0030] Figure 2 It is a plan view of a double steel column combined column base structure disclosed in an embodiment of the present invention;

[0031] Figure 3 It is an AA cross-sectional view of a double steel column combined column base structure disclosed in an embodiment of the present invention;

[0032] Figure 4 yes Figure 2 A magnified view of the M region in FIG.

[0033] Figure 5 is the bending moment diagram of the connecting plate groove;

[0034] Figure 6 It is a finite element analysis diagram of a double steel column base structure in the related art;

[0035] Figure 7 is a finite element analysis diagram of a double steel column combined column base structure disclosed in an embodiment of the present invention;

[0036] Figure 8 It is a flow chart of a construction method of a double steel column combined column base structure disclosed in an embodiment of the present invention.

[0037] Icons: 10. Double steel column combined column base structure; 11. Bottom plate; 12. First steel column; 121. First wall; 122. First surface; 12a. Second concrete; 13. Second steel column; 131. Second wall; 132. Second surface; 13a. Third concrete; 14. Connecting plate; 141. Connecting surface; 14a. Groove; 14b. Top end; 14c. Bottom end; 15. Expansion joint; 15a. First concrete; 16. Column base anchor bolt; 17. Inter-column ring plate; 18. First bolt; 19. Second bolt. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0040] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0043] In the related art, in order to prevent the building components from expanding and contracting due to climate temperature changes, causing cracks or damage to the structure, an expansion joint is set at an appropriate position along the construction joint direction of the building or building components during the construction process. The expansion joint divides the building components above the foundation, such as the floor slab, into two independent parts, and the floor slab is mainly supported by steel columns. Therefore, double steel columns are often designed at the expansion joint of the building structure to support the two parts of the building components respectively. However, in this way, each steel column independently supports the building component. This approach cannot achieve the common force of the double steel columns and cannot give play to the advantages of the superposition of the stiffness of the double steel columns.

[0044] Based on this, the present application discloses a double steel column joint column base structure. A connecting plate is arranged in the expansion joint formed between the first steel column and the second steel column, and the connecting plate connects the first steel column and the second steel column, so that the force between the first steel column and the second steel column is continuous. In this way, the advantages of common force and rigidity superposition of the double steel columns can be achieved, and the safety of the first steel column and the second steel column can be ensured.

[0045] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0046] First, please also refer to Figures 1 to 4 The present invention provides a double steel column combined column base structure 10, comprising a bottom plate 11, a first steel column 12, a second steel column 13 and a connecting plate 14. The first steel column 12 is arranged on the bottom plate 11; the second steel column 13 is arranged on the bottom plate 11, and the second steel column 13 is spaced from the second steel column 12 to form an expansion joint 15 therebetween. The connecting plate 14 is connected to one end of the first steel column 12 and the second steel column 13 close to the bottom plate 11, and the connecting plate 14 is located in the expansion joint 15.

[0047] It can be understood that, since the first steel column 12 and the second steel column 13 are both arranged on the bottom plate 11, the column feet of the first steel column 12 and the second steel column 13 are fixed to the bottom plate 11 by the column foot anchor bolts 16. Specifically, there can be a plurality of column foot anchor bolts 16, and the plurality of column foot anchor bolts 16 can be arranged at intervals along the outer periphery of the first steel column 12 and the second steel column 13.

[0048] By arranging a connecting plate 14 in the expansion joint 15 formed between the first steel column 12 and the second steel column 13, and connecting the first steel column 12 and the second steel column 13 with the connecting plate 14, the force between the first steel column 12 and the second steel column 13 can be made continuous. When the first steel column 12 and the second steel column 13 are subjected to bending moments or shear forces in the same direction, the stress of the bottom plate 11 and the column foot anchor bolts 16 can be reduced by utilizing the stiffness superposition effect of the first steel column 12 and the second steel column 13, thereby avoiding the situation that the bottom plate 11 and the column foot anchor bolts 16 may be broken due to stress concentration. When the first steel column 12 and the second steel column 13 are subjected to bending moments or shear forces in opposite directions, due to the connecting effect of the connecting plate 14, the first steel column 12, the second steel column 13 and the connecting plate 14 become an integral force-bearing structure, so that the forces in opposite directions can offset each other, thereby reducing the stress at the roots of the first steel column 12 and the second steel column 13, and ensuring the safety of the first steel column 12 and the second steel column 13.

[0049] That is to say, the double steel column combined column base structure 10 provided in this embodiment realizes the advantages of the common force and stiffness superposition of the first steel column 12 and the second steel column 13, solves the problem of being difficult to accurately analyze the actual effect of the force of each steel column on the column base of the steel column under various working conditions, and improves the safety of the project.

[0050] In some embodiments, the first steel column 12 and the second steel column 13 are both box-shaped steel columns, that is, the shape of the first steel column 12 cut along a plane perpendicular to the height direction of the first steel column 12 is a first rectangle, and the shape of the second steel column 13 cut along a plane perpendicular to the height direction of the second steel column 13 is a second rectangle. The area of ​​the second rectangle may be the same as the area of ​​the first rectangle, that is, the first steel column 12 and the second steel column 13 may be steel columns of the same volume, and the wall thickness of the first steel column 12 and the second steel column 13 is the same. It can be understood that in other embodiments, the first steel column 12 and the second steel column 13 may also be circular steel columns, H-shaped steel columns, etc.

[0051] Furthermore, when the first steel column 12 and the second steel column 13 are spaced apart, the first steel column 12 has a first wall 121, and the second steel column 13 has a second wall 131. The second wall 131 is spaced apart from the first wall 121 to form the expansion joint 15. The connecting plate 14 can be connected to the first wall 121 and the second wall 131, so that the first steel column 12 and the second steel column 13 are connected through the connecting plate 14, so that the force of the first steel column 12 and the second steel column 13 can be transmitted through the connecting plate 14.

[0052] In some embodiments, the connecting plate 14 is made of a steel plate, and the connecting plate 14 can be fixed to the first wall surface 121 and the second wall surface 131 by welding. It is understood that the fixing method of welding can effectively ensure the connection reliability of the connecting plate 14 and the first steel column 12 and the second steel column 13. It is understood that in other embodiments, the connecting plate 14 can also be fixed to the first steel column 12 and the second steel column 13 by screws.

[0053] Furthermore, there are two connecting plates 14, and the two connecting plates 14 are connected to both sides of the first steel column 12 and the second steel column 13 respectively. Among them, the connecting plate 14 has a connecting surface 141 facing away from the expansion joint 15, the first steel column 12 has a first surface 122, and the first surface 122 is adjacent to the above-mentioned first wall surface 121, the second steel column 13 has a second surface 132, and the second surface 132 is adjacent to the above-mentioned second wall surface 131, the first surface 122 is flush with the second surface 132, and the connecting surface 141 is flush with the first surface 122 and the second surface 132. By connecting the connecting plate 14 to both sides of the first steel column 12 and the second steel column 13 respectively, and the connecting surface 141 of the connecting plate 14 is flush with the first surface 122 and the second surface 132, the force transmission effect between the first steel column 12 and the second steel column 13 is better, which is conducive to ensuring the safety of the first steel column 12 and the second steel column 1.

[0054] That is to say, the connection surface 141 of the connection plate 14 is flush with the first surface 122 and the second surface 132. When the first steel column 12 is subjected to an external force, the force can be directly transmitted to the second surface 132 of the second steel column 13 through the connection plate 14; similarly, when the second steel column 13 is subjected to an external force, the force can be directly transmitted to the first surface 122 of the first steel column 12 through the connection plate 14. This force transmission route is simple and direct. If the connection plate 14 is set in the expansion joint between the first steel column 12 and the second steel column 13 and the connection surface 141 of the connection plate 14 is not flush with the first surface 122 and the second surface 132, when the first steel column 12 or the second steel column 13 is subjected to a large stress, it will cause the first wall 121 or the second wall 131 to buckle, affecting the safety of the double steel column combined column base structure.

[0055] In some embodiments, the shape of the first steel column 12 cut along a plane perpendicular to the height direction of the first steel column 12 is a first rectangle, the shape of the second steel column 13 cut along a plane perpendicular to the height direction of the second steel column 13 is a second rectangle, the first rectangle has a first long side a and a first short side b, and the second rectangle has a second long side c and a second short side d, then the height h of the connecting plate 14 = (1.3-1.7)*d1+(1.0-1.6)*d2. Wherein, d1 is the maximum value among the first long side a, the first short side b, the second long side c and the second short side d; d2 is the width of the expansion joint 15.

[0056] For example, when the first long side a is the largest among the first long side a, the first short side b, the second long side c and the second short side d, d1 is the value of the first long side a; and when the second long side c is the largest among the first long side a, the first short side b, the second long side c and the second short side d, d1 is the value of the second long side c. It can be understood that the width d2 of the expansion joint 15 can be determined according to the spacing between the first steel column 12 and the second steel column 13 during the actual construction process.

[0057] Considering that the height of the connecting plate 14 must be within a suitable range, the connecting plate 14 can fully exert the connecting effect on the first steel column 12 and the second steel column 13, and realize the advantages of the common force and rigidity superposition of the first steel column 12 and the second steel column 13. If the height of the connecting plate 14 is low, the force transmission effect between the first steel column 12 and the second steel column 13 is not good. When the first steel column 12 and the second steel column 13 are subjected to the bending moment or shear force in the same direction, the rigidity superposition effect between the first steel column 12 and the second steel column 13 is not good; if the height of the connecting plate 14 is high, it will cause waste of materials and increase construction costs, because the forces of the first steel column 12 and the second steel column 13 are mainly concentrated on the bottom plate 11 and the steel column foot position. In order to reduce the construction cost, the height of the connecting plate does not need to be set too high. Therefore, by limiting the height of the connecting plate 14 by the above d1 and d2, the connecting plate 14 can realize the connecting effect of the first steel column 12 and the second steel column 13 on the premise of reasonable use of construction materials, and exert the advantages of the common force and rigidity superposition of the first steel column 12 and the second steel column 13.

[0058] In some embodiments, the thickness of the connecting plate 14 may be substantially equal to the wall thickness of the first steel column 12 and the second steel column 13. On the one hand, when the connecting plate 14 is connected between the first steel column 12 and the second steel column 13, the force of the first steel column 12 transmitted from the connecting plate 14 to the second steel column 13 is continuous, which is more conducive to the transmission of force between the first steel column 12 and the second steel column 13; on the other hand, since the thickness of the connecting plate 14 is substantially equal to the wall thickness of the first steel column 12 and the second steel column 13, when the connecting plate 14 is connected to the first steel column 12 and the second steel column 13 by welding, the connection of the connecting plate 14 is more reliable.

[0059] In some embodiments, when the connecting plate 14 is connected between the first steel column 12 and the second steel column 13, it extends upward from one end of the first steel column 12 and the second steel column 13 connected to the bottom plate 11. In other words, the height direction of the connecting plate 14 is consistent with the height direction of the first steel column 12 and the second steel column 13. Therefore, the connecting plate 14 has a top end 14b and a bottom end 14c opposite to each other, the bottom end 14c of the connecting plate 14 can be connected to the bottom plate 11, and the two sides of the bottom end 14c of the connecting plate 14 can be connected to the first steel column 12 and the second steel column 13 respectively, and the top end 14b of the connecting plate 14 is provided with a groove 14a, and the groove 14a can be used to disperse the stress on the connecting plate 14.

[0060] Specifically, see Figure 5 When the first steel column 12 and the second steel column 13 are subjected to horizontal shear force, the closer the first steel column 12 and the second steel column 13 are to the root (i.e., the column foot), the greater the bending moment. Therefore, providing a groove 14a at the top 14b of the connecting plate 14 is equivalent to adding an armpit at the root of the first steel column 12 and the second steel column 13, so that the stress at the root can be distributed as evenly as possible, and the stress concentration at the root is alleviated. In other words, when the steel column is subjected to shear force, the bending moment increases toward the root, and providing the connecting plate 14 with a groove 14a is equivalent to adding an armpit at the root. After the armpit is added at the root, the cross-section of the connecting plate 14 increases toward the root, and the bending moment of the connecting plate 14 increases. Corresponding to the change in the bending moment of the steel column, the stress at the root will be smaller than that without the armpit, achieving the purpose of alleviating the stress concentration at the root.

[0061] Specifically, the groove 14a is slotted from both sides of the top 14b of the connecting plate 14, that is, the groove 14a runs through both sides of the top 14b of the connecting plate 14, and the width of the groove 14a gradually decreases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14. In other words, the width of the groove 14a is larger at a position close to the top 14b of the connecting plate 14, and because the groove 14a runs through both sides of the top 14b of the connecting plate 14, the width of the groove 14a at the top 14b of the connecting plate 14 is substantially equal to the width of the connecting plate 14, and the width of the groove is smaller at a position away from the top 14b of the connecting plate 14. It can be understood that the width of the groove 14a gradually decreases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14, which means that the cross-sectional area of ​​the groove 14a in the direction perpendicular to the height of the first steel column 12 gradually increases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14. In this way, the bending moment of the connecting plate 14 will become larger and larger, which corresponds to the change of the bending moment of the steel column, and can alleviate the stress concentration at the root.

[0062] Further, the depth of the groove 14a may be (1.0-1.6)*d2. For example, the depth of the groove 14a may be 1.0d2, 1.1d2, 1.2d2, 1.3d2, 1.4d2, 1.5d2 or 1.6d2, etc. Wherein, d2 is the width of the expansion joint 15. It can be understood that the depth of the groove 14a is determined according to the shape of the groove 14a. As can be seen from the above, the width of the groove 14a gradually decreases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14, that is, the cross-sectional area of ​​the groove 14a in the direction perpendicular to the height of the first steel column 12 gradually increases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14, and the greater the increase in the cross-sectional area of ​​the groove 14a, the shallower the depth of the groove 14a; the smaller the increase in the cross-sectional area of ​​the groove 14a, the deeper the depth of the groove 14a. That is to say, when the cross-sectional area of ​​the groove 14a in the direction perpendicular to the height of the first steel column 12 gradually increases from the top end 14b of the connecting plate 14 to the bottom end 14c of the connecting plate 14, the greater the change range, the smaller the depth of the groove 14a, the faster the stress magnitude of the connecting plate 14 from the top end 14b to the bottom end 14c changes, and the smaller the effect of relieving stress concentration at the root; conversely, when the cross-sectional area of ​​the groove 14a in the direction perpendicular to the height of the first steel column 12 gradually increases from the top end 14b of the connecting plate 14 to the bottom end 14c of the connecting plate 14, the smaller the change range, the greater the depth of the groove 14a, the slower the stress magnitude of the connecting plate 14 from the top end 14b to the bottom end 14c changes, and the more obvious the effect of relieving stress concentration at the root, but because the greater the depth of the groove 14a and the greater the height of the connecting plate 14, the more material is required. Therefore, this embodiment limits the range of the groove 14 a to a suitable range, namely (1.0-1.6)*d2, which can effectively ensure the stress relief effect of the groove 14 a on the roots of the first steel column 12 and the second steel column 13 .

[0063] Optionally, the shape of the groove 14a cut along a plane parallel to the height direction of the connecting plate 14 can be a right-angled trapezoid, an isosceles trapezoid, a U-shape or a V-shape, etc., as long as the width of the groove 14a gradually decreases from the top end 14b of the connecting plate 14 to the bottom end 14c of the connecting plate 14. This embodiment does not make any specific limitation on this.

[0064] Please refer again Figure 1 and Figure 3In some embodiments, the double steel column combined column base structure 10 further includes an inter-column ring plate 17, which is sleeved on the outer periphery of the first steel column 12 and the second steel column 13. Specifically, the inter-column ring plate 17 can be welded on the outer periphery of the first steel column 12 and the second steel column 13, so that the connection between the inter-column ring plate 17 and the first steel column 12 and the second steel column 13 can be more reliable. By sleeved the inter-column ring plate 17 on the outer periphery of the first steel column 12 and the second steel column 13, the stability of the double steel column combined column base structure 10 can be further consolidated, so that the stiffness superposition advantage of the first steel column 12 and the second steel column 13 can be better realized.

[0065] Furthermore, the inter-column ring plate 17 is sleeved on the outer periphery of the first steel column 12 and the second steel column 13 at a position corresponding to the top 14b of the connecting plate 14, and the projection of the upper edge of the inter-column ring plate 17 on the connecting plate 14 is located below the groove 14a. It can be understood that the cross-sectional area of ​​the groove 14a in the direction perpendicular to the height of the first steel column 12 gradually increases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14, and the bending moment of the groove 14a also gradually increases from the top 14b of the connecting plate 14 to the bottom 14c of the connecting plate 14 in the direction perpendicular to the height of the first steel column 12. At this time, the force below the groove 14a is the largest. Therefore, sleeved on the upper edge of the inter-column ring plate 17 at the position corresponding to the bottom of the groove 14a of the first steel column 12 and the second steel column 13, it is more conducive to alleviating the bending moment of the first steel column 12 and the second steel column 13 at the root.

[0066] As can be seen from the above, the inter-column ring plate 17 is sleeved on the outer periphery of the first steel column 12 and the second steel column 13, and the height direction of the inter-column ring plate 17 is consistent with the height direction of the first steel column 12 and the second steel column 13. The height of the inter-column ring plate 17 is (0.2~0.3)*d1, such as 0.2d1, 0.25d1, 0.3d1, etc. Among them, d1 is the maximum value among the aforementioned first long side a, the aforementioned first short side b, the aforementioned second long side c, and the aforementioned second short side d. For example, when the first long side a is the largest among the first long side a, the first short side b, the second long side c, and the second short side d, d1 is the value of the first long side a; and when the second long side c is the largest among the first long side a, the first short side b, the second long side c, and the second short side d, d1 is the value of the second long side c.

[0067] It is understandable that if the height of the inter-column ring plate 17 is too low, its force-bearing area is small, and the force-bearing effect of the inter-column ring plate 17 is not good; and the higher the height of the inter-column ring plate 17, the larger its force-bearing area and the better the force-bearing effect. However, if the height of the inter-column ring plate 17 exceeds the aforementioned limited height range, its force-bearing effect does not change much, so if the height of the inter-column ring plate 17 is too high, it will cause material waste. Therefore, in order to ensure good force and save construction costs, the height of the inter-column ring plate 17 is limited to a certain range, that is, the height of the inter-column ring plate 17 is limited to (0.2~0.3)*d1.

[0068] Optionally, the thickness of the inter-column ring plate 17 may be roughly equal to the wall thickness of the first steel column 12 and the second steel column 13. In this way, the force of the inter-column ring plate 17 will be more reasonable. In other words, the thickness of the inter-column ring plate 17 is as thick as the column wall of the first steel column 12 and the second steel column 13, and the cross-sectional strength of the inter-column ring plate 17 is equal to the cross-sectional strength of the column wall of the first steel column 12 and the second steel column 13 calculated by the column bottom shear force. In this way, the first steel column 12 and the second steel column 13 can better transfer the force to the inter-column ring plate 17, making the force of the double steel column combined column base structure 10 more reasonable.

[0069] In some embodiments, the inter-column ring plate 17 is made of a steel plate, and the inter-column ring plate 17 is fixed by welding. It is understood that the use of welding can effectively ensure the connection reliability between the inter-column ring plate 17 and the first steel column 12 and the second steel column 13. It is understood that in other embodiments, the inter-column ring plate 17 can also be fixed to the first steel column 12 and the second steel column 13 by screws.

[0070] In some embodiments, a plurality of first pegs 18 and a plurality of second pegs 19 are respectively disposed on the surfaces of the first steel column 12 and the second steel column 13 facing the expansion joint 15, that is, a plurality of first pegs 18 and a plurality of second pegs 19 are respectively disposed on the aforementioned first wall surface 121 and the aforementioned second wall surface 131. The plurality of first pegs 18 are disposed at intervals along the height direction of the first steel column 12, and the plurality of second pegs 19 are disposed at intervals along the height direction of the second steel column 13, and each first peg 18 is disposed correspondingly to each second peg 19. Specifically, the spacing between the first bolt 18 and the second bolt 19 in the vertical direction (i.e., the height direction of the first steel column 12 and the second steel column 13) is 170-230 mm, such as 170 mm, 180 mm, 190 mm, 200 mm, 210 mm, 220 mm, 230 mm, etc.; the spacing between the first bolt 18 and the second bolt 19 in the horizontal direction is 50-500 mm, such as 50 mm, 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, etc. Since the bolts play a role in transmitting force, the more bolts there are, the better the force transmission effect. If the bolt spacing is too large, the bolt transmission effect will be poor; if the bolt spacing is small, although the force transmission effect is better, it will cause material waste due to excessive bolt usage. Therefore, in some embodiments, the spacing between the bolts is limited to ensure that the amount of bolts used is reduced while satisfying the force transmission effect, thereby reducing the construction cost.

[0071] Furthermore, a first concrete 15 a is poured in the expansion joint 15 , and the pouring height of the first concrete 15 a in the expansion joint 15 is close to or flush with the upper edge of the inter-column ring plate 17 .

[0072] It can be understood that the function of the bolt is to transfer the force. That is, when the first steel column 12 and the second steel column 13 are subjected to pressure, the first steel column 12 and the second steel column 13 can transfer the force to the first concrete 15a poured in the expansion joint 15 through the bolt; when the first concrete 15a poured in the expansion joint 15 is subjected to tension, the first concrete 15a poured in the expansion joint 15 can transfer the force to the first steel column 12 and the second steel column 13 through the bolt. In this way, the tensile performance of the first steel column 12 and the second steel column 13 and the compressive performance of the first concrete 15a poured in the expansion joint 15 can be fully utilized to ensure the safety of the double steel column combined column base structure 10.

[0073] As can be seen from the above, the bending moment at the bottom end 14c of the groove 14a is the largest, and it can be deduced that the bending moment is the largest at the upper edge of the inter-column ring plate 17. Therefore, making the pouring height of the concrete in the expansion joint 15 close to or flush with the upper edge of the inter-column ring plate 17 can reduce the stress at the roots of the first steel column 12 and the second steel column 13 as a whole.

[0074] Among them, the first concrete 15a poured in the expansion joint 15 covers all the first bolts 18 and all the second bolts 19. It can be understood that the first concrete 15a poured in the expansion joint 15 and the bolts need to cooperate with each other to play their own force-bearing and force-transmitting functions. In other words, if there is no first concrete 15a, the bolts will have no transmission carrier to transmit the force received by the first steel column 12 and the second steel column 13. Therefore, the first concrete 15a poured in the expansion joint 15 needs to cover all the first bolts 18 and all the second bolts 19. In other words, the setting heights of the first bolts 18 and the second bolts 19 on the first steel column 12 and the second steel column 13 are respectively approximately close to or flush with the upper edge of the inter-column ring plate 17.

[0075] In some embodiments, the second concrete 12a and the third concrete 13a are poured in the first steel column 12 and the second steel column 13. The pouring height of the second concrete 12a and the third concrete 13a in the first steel column 12 and the second steel column 13 is close to or flush with the upper edge of the inter-column ring plate 17. As can be seen from the above, the bending moment is the largest at the upper edge of the inter-column ring plate 17, and the first steel column 12 and the second steel column 13 are subjected to the largest force at the upper edge of the inter-column ring plate 17. Therefore, the pouring height of the second concrete 12a and the third concrete 13a in the first steel column 12 and the second steel column 13 is close to or flush with the upper edge of the inter-column ring plate 17, which can reduce the stress at the root of the double steel column combined column base structure 10 as a whole. That is to say, the second concrete 12a and the third concrete 13a poured in the first steel column 12 and the second steel column 13 can disperse the compressive stress of the first steel column 12 and the second steel column 13, making the double steel column combined column base structure 10 more stable.

[0076] The double steel column combined column base structure 10 provided in this embodiment will be subjected to finite element analysis in combination with experimental data.

[0077] Specifically, it is taken as an example that the thickness of the connecting plate 14 is 30 mm, the height is 1800 mm, wherein the depth of the groove 14 a is 400 mm; and the height of the inter-column ring plate 17 is 400 mm, and the thickness is 30 mm.

[0078] Form 1: Please refer to Figure 6In the absence of any reinforcement structure (equivalent to the first steel column 12 and the second steel column 13 being independent of each other in the related art), under the action of the set axial force and bending moment, the tensile stress at the root of the double steel column combined column base structure is 59.5103MPa and the compressive stress is -73.5059MPa. Figure 6 As shown, Figure 6 The middle steel column is at the root, and is subject to greater tensile and compressive stresses.

[0079] Form 2: When a connecting plate 14 is provided at the expansion joint 15 between the first steel column 12 and the second steel column 13, under the action of the set axial force and bending moment, the tensile stress at the root of the double steel column combined column base structure is 27.5183MPa, and the compressive stress is -62.7350MPa. The tensile stress of the double steel column combined column base structure using Form 2 is 47% of the tensile stress of the double steel column combined column base structure of Form 1, and the compressive stress of the double steel column combined column base structure of Form 2 is 85% of the compressive stress of the double steel column combined column base structure of Form 1.

[0080] That is, the connecting plate 14 is arranged between the first steel column 12 and the second steel column 13, and by limiting the height and thickness of the connecting plate 14 and the arrangement of the groove 14a on the connecting plate 14, the tensile stress and compressive stress at the column feet of the first steel column 12 and the second steel column 13 can be effectively reduced.

[0081] Form 3: When a connecting plate 14 is provided between the first steel column 12 and the second steel column 13 and an inter-column ring plate 17 is sleeved on the outer periphery of the first steel column 12 and the second steel column 13, under the action of the set axial force and bending moment, the tensile stress at the root of the double steel column combined column base structure is 23.1024MPa and the compressive stress is -57.9243MPa. The tensile stress of the double steel column combined column base structure of Form 3 is 39% of the tensile stress of the double steel column combined column base structure of Form 1, and the compressive stress of the double steel column combined column base structure of Form 3 is 79% of the compressive stress of the double steel column combined column base structure of Form 1.

[0082] That is, in addition to the connection plate 14 described above, an inter-column ring plate 17 is provided between the first steel column 12 and the second steel column 13 , thereby further effectively alleviating the tensile stress and compressive stress on the column feet of the first steel column 12 and the second steel column 13 .

[0083] Form 4: Please refer to Figure 7, when a connecting plate 14 is provided between the first steel column 12 and the second steel column 13, an inter-column ring plate 17 is sleeved on the outer periphery of the first steel column 12 and the second steel column 13, and an expansion joint is provided between the columns, and concrete is poured inside the first steel column 12 and the second steel column 13, under the action of the set axial force and bending moment, the tensile stress at the root of the double steel column combined column base structure is 22.8531MPa, and the compressive stress is -56.3452MPa. The tensile stress of the double steel column combined column base structure of form 4 is 38% of the tensile stress of the double steel column combined column base structure of form 1, and the compressive stress of the double steel column combined column base structure of form 4 is 77% of the compressive stress of the double steel column combined column base structure of form 1.

[0084] That is, in addition to the above-mentioned connection plate 14 and inter-column ring plate 17, the first concrete 15a, the second concrete 12a, the third concrete 13a, the first bolt 18 and the second bolt 19 are also added between the first steel column 12 and the second steel column 13, which has a better effect of alleviating the tensile stress and compressive stress at the column base of the first steel column 12 and the second steel column 13.

[0085] Specifically, as shown in the following Table 1, Table 1 shows the magnitude of tensile stress and compressive stress on the root of the double steel column combined column base structure in different forms under the action of the set axial force and bending moment.

[0086] Table 1

[0087]

[0088] It can be seen from Table 1 that when the first steel column 12 and the second steel column 13 are subjected to the same external force, compared with the double steel column combined column base structure in the related art in which the first steel column 12 and the second steel column 13 are independent of each other, the double steel column combined column base structure 10 of this embodiment can significantly reduce the tensile stress and compressive stress at the root of the double steel column combined column base structure 10, thereby ensuring the safety of the double steel column combined column base structure 10.

[0089] The double steel column combined column base structure 10 disclosed in the embodiment of the present application realizes the advantages of double column common force and stiffness superposition by setting a connecting plate 14 in the expansion joint formed between the first steel column 12 and the second steel column 13 arranged at intervals, so that the connecting plate 14 is connected to the first steel column 12 and the second steel column 13 at one end close to the bottom plate 11. In addition, the inter-column ring plate 17 is sleeved on the outer periphery of the first steel column 12 and the second steel column 13, and bolts are set in the expansion joint 15, and concrete is poured in the expansion joint 15, the first steel column 12 and the second steel column 13. With the double steel column combined column base structure 10 of this embodiment, when the first steel column 12 and the second steel column 13 are subjected to bending moment or shear force in the same direction, the stiffness superposition effect of the first steel column 12 and the second steel column 13 can be used to reduce the stress of the bottom plate 11 and the column base anchor bolt 16, thereby avoiding the situation that the bottom plate 11 and the column base anchor bolt 16 may be broken due to stress concentration. When the first steel column 12 and the second steel column 13 are subjected to bending moments or shear forces in opposite directions, due to the joint action of the connecting plate 14, the inter-column ring plate 17 and the expansion joint 15, and the concrete poured in the first steel column 12 and the second steel column 13, the first steel column 12, the second steel column 13, the connecting plate 14, the inter-column ring plate 17 and the expansion joint 15, and the concrete poured in the first steel column 12 and the second steel column 13 become an integral force-bearing structure, so that the forces in opposite directions can offset each other, thereby reducing the stress at the roots of the first steel column 12 and the second steel column 13, and ensuring the safety of the first steel column 12 and the second steel column 13. In addition, since the double steel column combined column foot structure 10 disclosed in this embodiment is simple in structure and easy to construct, the economy of its construction is guaranteed.

[0090] Second, see Figure 1 and Figure 8 The present invention also provides a construction method for a double steel column combined column base structure, which is used to obtain the double steel column combined column base structure as described in the first aspect above.

[0091] Specifically, the construction method of the double steel column combined column base structure described in this embodiment includes the following steps:

[0092] Step 201: a plurality of first bolts and a plurality of second bolts are respectively arranged on mutually facing surfaces of a first steel column and a second steel column.

[0093] Specifically, considering that the first steel column and the second steel column in the double steel column combined column base structure need to be spaced apart on the bottom plate. Since the space between the first steel column and the second steel column is small, the space for installing the bolt is small and the installation is difficult. The purpose of this step is to facilitate the installation of the bolt. If the first steel column and the second steel column are fixed first, it will increase the difficulty of installing the bolt, or even make it impossible to install the bolt.

[0094] Among them, the first bolts are arranged at intervals along the height direction of the first steel column, the second bolts are arranged at intervals along the height direction of the second steel column, and the vertical spacing between the first bolts and the second bolts is 170-230mm; each first bolt is arranged corresponding to each second bolt, and the horizontal spacing between the first bolt and the second bolt is 50-500mm.

[0095] Furthermore, the first bolt and the second bolt are respectively arranged to preset positions along the height direction of the first steel column and the second steel column.

[0096] Step 202: Fix the first steel column and the second steel column on the bottom plate at intervals, so that the expansion joint is formed between the first steel column and the second steel column.

[0097] Among them, pouring openings are reserved on the first steel column and the second steel column to facilitate pouring concrete into the first steel column and the second steel column later.

[0098] Step 203: Connect the connection plate to one end of the first steel column and the second steel column close to the bottom plate, so that the connection plate is located in the expansion joint.

[0099] Specifically, the connection plate can be welded between the first steel column and the second steel column, and the extension height direction of the connection plate in the expansion joint is consistent with the height direction of the first steel column and the second steel column. The connection plate has a connection surface facing away from the expansion joint, the first steel column has a first surface, the second steel column has a second surface, the first surface is flush with the second surface, and the connection surface is flush with the first surface and the second surface.

[0100] It is understandable that before installing the connecting plate, a groove may be provided at one end of the mounting plate. The groove may be in the shape of a right-angled trapezoid, an isosceles trapezoid, a U-shape, a V-shape, or the like.

[0101] When actually installing the connecting plate, the end of the connecting plate with the groove should be used as the top of the connecting plate, and the end of the connecting plate without the groove should be used as the bottom of the connecting plate, so that the bottom end of the connecting plate is connected to the base plate, and at the same time, the two sides of the bottom end of the connecting plate are respectively connected to the first steel column and the second steel column.

[0102] Step 204: Sleeve the inter-column ring plate on the outer periphery of the first steel column and the second steel column, corresponding to the position of the top end of the connecting plate, and the projection of the upper edge of the inter-column ring plate on the connecting plate is located below the groove.

[0103] The upper edge of the inter-column ring plate is flush with the aforementioned preset position, and the inter-column ring plate can be welded to the outer periphery of the first steel column and the second steel column by welding.

[0104] Step 205: Pour the first concrete, the second concrete, and the third concrete into the expansion joint, the first steel column, and the second steel column respectively.

[0105] The pouring heights of the first concrete, the second concrete and the third concrete are all close to or flush with the upper edge of the inter-column ring plate.

[0106] It can be seen that the construction method of the double steel column combined column base structure is simple and easy to operate, and has the advantages of easy construction and low cost. In addition, the double steel column combined column base structure obtained by this construction method has all the technical effects of the double steel column combined column base structure described in the first aspect. Since the technical effects of the double steel column combined column base structure have been fully described in the first aspect, they will not be repeated here.

Claims

1. A double steel column combined column base structure, characterized in that: include Base plate; a first steel column, the first steel column being arranged on the bottom plate; a second steel column, the second steel column being disposed on the bottom plate, the second steel column being spaced apart from the first steel column to form an expansion joint therebetween; A connecting plate, the connecting plate is connected to one end of the first steel column and the second steel column close to the bottom plate, and the connecting plate is located in the expansion joint; An inter-column ring plate, wherein the inter-column ring plate is sleeved on the outer circumference of the first steel column and the second steel column; The second concrete and the third concrete are poured into the first steel column and the second steel column respectively. The pouring height of the second concrete and the third concrete in the first steel column and the second steel column is close to or flush with the upper edge of the inter-column ring plate.

2. The double steel column combined column base structure according to claim 1 is characterized in that: There are two connecting plates, and the two connecting plates are respectively connected to two sides of the first steel column and the second steel column; The connecting plate has a connecting surface facing away from the expansion joint, the first steel column has a first surface, the second steel column has a second surface, the first surface is flush with the second surface, and the connecting surface is flush with the first surface and the second surface.

3. The double steel column combined column base structure according to claim 1 is characterized in that: The shape of the first steel column cut along a plane perpendicular to the height direction of the first steel column is a first rectangle, the first rectangle has a first long side and a first short side, and the shape of the second steel column cut along a plane perpendicular to the height direction of the second steel column is a second rectangle, the second rectangle has a second long side and a second short side; The height of the connecting plate h = (1.3-1.7)*d1+(1.0-1.6)*d2; Wherein, d1 is the maximum value among the first long side, the first short side, the second long side and the second short side; d2 is the width of the expansion joint.

4. The double steel column combined column base structure according to claim 1, characterized in that: A groove is arranged at the top end of the connecting plate, and the groove is used to disperse the stress on the connecting plate.

5. The double steel column combined column base structure according to claim 4 is characterized in that: The width of the groove gradually decreases from the top end of the connecting plate to the bottom end of the connecting plate.

6. The double steel column combined column base structure according to claim 4 is characterized in that: The inter-column ring plate is sleeved on the outer periphery of the first steel column and the second steel column at a position corresponding to the top end of the connecting plate, and the projection of the upper edge of the inter-column ring plate on the connecting plate is located below the groove.

7. The double steel column combined column base structure according to claim 4 is characterized in that: The height of the inter-column ring plate is (0.2-0.3)*d1, and the thickness of the inter-column ring plate is the same as the wall thickness of the first steel column and the second steel column; Among them, the shape of the first steel column cut along a plane perpendicular to the height direction of the first steel column is a first rectangle, the first rectangle has a first long side and a first short side, the shape of the second steel column cut along a plane perpendicular to the height direction of the second steel column is a second rectangle, the second rectangle has a second long side and a second short side; d1 is the maximum value of the first long side, the first short side, the second long side and the second short side.

8. The double steel column combined column base structure according to claim 4, characterized in that: A plurality of first pegs and a plurality of second pegs are respectively arranged on the surfaces of the first steel column and the second steel column facing the expansion joint, wherein the plurality of first pegs are arranged at intervals along the height direction of the first steel column, and the plurality of second pegs are arranged at intervals along the height direction of the second steel column, and each of the first pegs is arranged correspondingly to each of the second pegs; The first concrete is poured in the expansion joint, the pouring height of the first concrete in the expansion joint is close to or flush with the upper edge of the inter-column ring plate, and the first concrete covers each of the first bolts and each of the second bolts.

9. A construction method of a double steel column combined column base structure, characterized in that: The double steel column combined column base structure is the double steel column combined column base structure according to any one of claims 1 to 8, and the construction method comprises: Fixing the first steel column and the second steel column on the bottom plate at intervals so that the expansion joint is formed between the first steel column and the second steel column; The connecting plate is connected to the first steel column and one end of the second steel column close to the bottom plate, so that the connecting plate is located in the expansion joint.

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