A reinforcement method for improving the bearing capacity of old welded iron towers

Abstract

The invention discloses a reinforcement method for improving the bearing performance of an old welded iron tower. The outer steel frame is composed of a main material reinforcement angle steel, a transverse material reinforcement angle steel and a reinforcement node plate. The method comprises: respectively drilling holes at two limbs of the main material reinforcement angle steel and the original angle steel and drilling holes at one limb of the transverse material reinforcement angle steel, and then connecting the outer steel frame composed of the main material reinforcement angle steel and the transverse material reinforcement angle steel with the original iron tower main material angle steel by bolts, and connecting the outer steel frame, the original outer angle steel and the reinforcement node plate together to form a whole through a weld; a new concrete guardrail is poured on the original concrete guardrail; after the reinforcement is completed, corrosion-resistant paint is applied to the whole to prevent the rods from rusting; the method of the invention can not only effectively reduce the stress over-limit of the main material of the old welded iron tower, enhance the safety performance of the nodes of the old welded iron tower, and improve the bearing performance of the old welded iron tower, but also has the advantages of convenient construction, low cost and beautiful appearance.

Description

Technical Field

[0001] The invention relates to the field of transmission tower structure reinforcement, and in particular to a reinforcement method for improving the bearing performance of an old welded tower. Background Art

[0002] Due to the long service time, some rods of the old welded iron towers have rusted. Since the rods of the old welded iron towers are connected by welding, it is difficult to replace the rods, resulting in the stress of the rods of the old welded iron towers exceeding the limit. Because there are many old welded iron towers and some old welded iron towers are in good service, the economic benefits of targeted reinforcement are significantly higher than rebuilding the iron tower. Therefore, it is urgent to provide a reinforcement method that is convenient to construct, safe and reliable, economical and beautiful to improve the bearing performance of old welded iron towers. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention provides a reinforcement method for improving the bearing performance of old welded iron towers. The method of the present invention can not only effectively reduce the stress excess of the main material of the old welded iron tower, enhance the safety performance of the nodes of the old welded iron tower, and improve the bearing performance of the old welded iron tower, but also has the advantages of convenient construction, low cost and beautiful appearance.

[0004] To achieve the above object, the present invention provides a reinforcement method for improving the bearing performance of an old welded iron tower. The outer steel frame is composed of angle steel for main material reinforcement, angle steel for horizontal material reinforcement and node plate for reinforcement. The method comprises:

[0005] Step 1: Remove the paint film and rust residue on the outer surface of the original angle steel of the tower to ensure that the surface of the original angle steel is flat;

[0006] Step 2: Drill holes at the two ends of the main material reinforcement angle steel and the original angle steel;

[0007] Step 3: Drill a hole at one leg of the angle steel used for horizontal reinforcement;

[0008] Step 4: Use bolts to connect the main material reinforcement angle steel and the horizontal material reinforcement angle steel with the original angle steel of the tower main material to form an outer steel frame;

[0009] Step 5: The end of the angle steel used for main material reinforcement is welded to the end of the original outer angle steel;

[0010] Step 6: Weld the reinforcement node plate between the main material reinforcement angle steel and the edge of the original outer angle steel;

[0011] Step 7: Pour a new concrete guardrail on the bottom concrete guardrail of the old welded iron tower;

[0012] Step 8: After all reinforcement is completed, paint the entire rod with corrosion-resistant paint to prevent rust.

[0013] Preferably, the specifications of the angle steel used for reinforcing the main material in step 2 are the same as the specifications of the original outer angle steel.

[0014] Preferably, in step 3, the angle steel used for reinforcing the horizontal material is selected from L50×5 specification angle steel, and the angle steel used for reinforcing the bottom horizontal material is selected from L56×5 specification angle steel.

[0015] Preferably, in step 4, the inner fillet of the angle steel used for main material reinforcement is polished to facilitate fitting with the original angle steel to form a tight whole.

[0016] Preferably, the holes punched at both ends of the angle steel used for reinforcing the main material in step 2 are consistent in size and aligned in position with those of the original angle steel.

[0017] Preferably, in step 3, the holes for the angle steel used for reinforcing the horizontal material are punched at a position where the angle steel used for reinforcing the main material is in contact with one limb of the angle steel used for reinforcing the main material.

[0018] Preferably, the holes punched in the angle steel for reinforcing the horizontal material in step 3 are consistent in size and aligned in position with the holes punched in the angle steel for reinforcing the main material and the original angle steel.

[0019] Preferably, in step 4, the angle steel used for reinforcing the main material is attached to the outside of the original angle steel by bolt connection, thereby increasing the strength net cross-sectional area of ​​the main material of the tower and reducing the strength stress during the main material verification.

[0020] Preferably, in step 4, the angle steel for reinforcing the horizontal material is connected with the angle steel for reinforcing the main material through bolts to form an outer steel frame and the original angle steel to become one. The angle steel for reinforcing the horizontal material should be arranged at the equal-division point between the connection between the original tower diagonal material and the original angle steel, so that the original tower rod arrangement is changed from parallel axis arrangement to minimum axis arrangement, reducing the calculated length and slenderness ratio of the main material, and reducing the stable stress during the main material verification.

[0021] Preferably, in step 5, the angle steel used for reinforcing the main material is connected to the original outer angle steel through a weld.

[0022] Preferably, in step 6, the thickness of the node plate used for reinforcement is selected to be consistent with the thickness of the original outer angle steel.

[0023] Preferably, in the step 6, the reinforcement node plate is connected to the main material reinforcement angle steel and the original outer angle steel through welds, so that the upper and lower outer jacket steel frames of the original tower cross member and the original outer angle steel form a whole, thereby enhancing the safety performance of the tower main material connection node.

[0024] Preferably, in the step 7, the newly cast concrete guardrail should have angle steels for reinforcing the bottom cross members buried inside to enhance the safety performance of the bottom of the tower.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In a reinforcement method for improving the bearing performance of an old welded iron tower provided by the present invention, an outer steel frame is formed by main material reinforcement angle steel, cross material reinforcement angle steel and reinforcement node plate to reinforce the rods and nodes of the old welded iron tower. The outer steel frame composed of main material reinforcement angle steel and cross material reinforcement angle steel is connected to the outer shell of the main material of the old welded iron tower by bolts, so as to increase the net cross-sectional area of ​​the strength of the main material of the iron tower, change the arrangement mode of the rods of the old welded iron tower from parallel axis arrangement to minimum axis arrangement, reduce the calculated length and slenderness ratio of the main material, and significantly reduce the strength stress and stable stress during the main material verification; the outer steel frame is connected to the original outer angle steel by welds to improve the safety performance at the nodes of the iron tower; the safety of the bottom of the iron tower is enhanced by increasing the height of the concrete guard platform; after the reinforcement is completed, the corrosion-resistant paint is applied to the whole to prevent the rods from rusting; the method of the present invention can not only effectively reduce the stress over-limit of the main material of the old welded iron tower, enhance the safety performance of the nodes of the old welded iron tower, and improve the bearing performance of the old welded iron tower, but also has the advantages of convenient construction, low cost and beautiful appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0028] In the attached picture:

[0029] Figure 1 It is a schematic diagram of the middle part of a reinforcement method for improving the bearing performance of an old welded iron tower according to the present invention;

[0030] Figure 2 A bottom schematic diagram of a reinforcement method for improving the bearing performance of an old welded iron tower according to the present invention;

[0031] Figure 3 This is a schematic diagram of the middle part of the original tower;

[0032] Figure 4 This is a schematic diagram of the original tower bottom;

[0033] Figure 5 It is a schematic diagram of section 1-1;

[0034] Figure 6 It is a schematic diagram of section 2-2;

[0035] Figure 7 This is the schematic diagram of the original angle steel;

[0036] Figure 8 Schematic diagram of angle steel used for main material reinforcement;

[0037] Fig. 9 This is a schematic diagram of angle steel used for horizontal reinforcement;

[0038] Fig.10 It is a schematic diagram of the connection at the node;

[0039] Fig.11 Schematic diagram of the newly poured concrete guardrail at the bottom.

[0040] In the figure: 1. Original angle steel, 2. Angle steel for main material reinforcement, 3. Angle steel for cross material reinforcement, 4. Bolts, 5. Original angle steel hole, 6. Angle steel hole for main material reinforcement, 7. Fillet, 8. Angle steel hole for cross material reinforcement, 9. Original tower diagonal material, 10. Original tower cross material, 11. Original outer wrapped angle steel, 12. Original bolts, 13. Original node plate, 14. Node plate for reinforcement, 15. Weld, 16. Angle steel for bottom cross material reinforcement, 17. Original concrete guardrail, 18. Newly poured concrete guardrail.

[0041] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0043] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] like Figures 1 to 11 As shown, a reinforcement method for improving the bearing performance of an old welded iron tower, wherein the outer steel frame is composed of angle steel for main material reinforcement, angle steel for horizontal material reinforcement and node plate for reinforcement, comprises the following steps:

[0046] Step 1: Remove the paint film and rust residue on the outer surface of the original angle steel 1 of the tower to ensure that the surface of the original angle steel 1 is flat;

[0047] Step 2: Drill the original angle steel hole 5 and the main material reinforcement angle steel hole 6 at the two limbs of the main material reinforcement angle steel 2 and the original angle steel 1 respectively;

[0048] Step 3: Drill a hole 8 for the angle steel for reinforcing the horizontal material at one end of the angle steel 3 for reinforcing the horizontal material;

[0049] Step 4: Use bolts 4 to connect the main material reinforcement angle steel 2 and the horizontal material reinforcement angle steel 3 with the tower main material original angle steel 1 to form an outer jacket steel frame;

[0050] Step 5: The end of the main material reinforcement angle steel 2 is welded to the end of the original outer angle steel 11;

[0051] Step 6: Weld the reinforcement node plate 14 between the edges of the main material reinforcement angle steel 2 and the original outer angle steel 11.

[0052] Step 7: Pour a new concrete guardrail 18 on the concrete guardrail 17 at the bottom of the old welded iron tower.

[0053] Step 8: After all reinforcement is completed, apply corrosion-resistant paint to the entire rod to prevent rust

[0054] Preferably, the specifications of the angle steel 2 used for main material reinforcement in step 2 are the same as the specifications of the original outer angle steel 11.

[0055] Preferably, in step 3, the angle steel 3 for reinforcing the horizontal material is selected from angle steels with specifications of L50×5, and the angle steel 16 for reinforcing the bottom horizontal material is selected from angle steels with specifications of L56×5.

[0056] Preferably, in step 4, the internal fillet 7 of the main material reinforcement angle steel 2 is polished to facilitate fitting with the original angle steel 1 to form a tight whole.

[0057] Preferably, the angle steel 2 for main material reinforcement in step 2 has the same size and aligned positions as the holes 5 and 6 punched at both ends of the original angle steel 1.

[0058] Preferably, in step 3, the hole 8 of the angle steel 3 for reinforcing the horizontal material is punched at a position where the angle steel 2 for reinforcing the main material is in contact with the horizontal material.

[0059] Preferably, the holes 8 punched in the angle steel 3 for reinforcing the horizontal material in step 3 are of the same size and aligned in position as the holes 5 and 6 punched in the angle steel 2 for reinforcing the main material and the original angle steel 1.

[0060] Preferably, in step 4, the angle steel 2 for main material reinforcement is attached to the outside of the original angle steel 1 by bolts 4, so as to increase the strength net cross-sectional area of ​​the main material of the tower and reduce the strength stress of the main material during verification.

[0061] Preferably, in step 4, the angle steel 3 for reinforcing the horizontal material is connected with the angle steel 2 for reinforcing the main material by bolts 4 to form an outer sleeve steel frame and the original angle steel 1 to become one. The angle steel 3 for reinforcing the horizontal material should be arranged at the equal-division point between the connection between the original tower diagonal material 9 and the original angle steel 1, so that the original tower rod arrangement is changed from parallel axis arrangement to minimum axis arrangement, reducing the calculated length and slenderness ratio of the main material, and reducing the stable stress during the main material verification.

[0062] Preferably, in step 5, the main material reinforcement angle steel 2 is connected to the original outer angle steel 11 through a weld 15 .

[0063] Preferably, the thickness of the node plate 14 used for reinforcement in step 6 is selected to be consistent with the thickness of the original outer angle steel 11.

[0064] Preferably, the reinforcement node plate 14 in step 6 is connected to the main material reinforcement angle steel 2 and the original outer angle steel 11 through a weld 15, so that the upper and lower outer jacket steel frames of the original tower cross member 10 and the original outer angle steel 11 form a whole, thereby enhancing the safety performance of the tower main material connection node.

[0065] Preferably, in the step 7, the newly cast concrete guard platform 18 should bury the angle steel 16 for bottom cross member reinforcement inside to enhance the safety performance of the bottom of the tower.

[0066] In summary, in a reinforcement method for improving the bearing capacity of an old welded iron tower provided by the present invention, an outer steel frame is formed by using main material reinforcement angle steel, horizontal material reinforcement angle steel and reinforcement node plates to reinforce the old welded iron tower rods and nodes. By bolting the outer jacket steel frame composed of the main material reinforcement angle steel and the cross material reinforcement angle steel on the outer jacket of the main material of the old welded iron tower, the net cross-sectional area of ​​the strength of the main material of the iron tower is increased, the arrangement of the rods of the old welded iron tower is changed from parallel axis arrangement to minimum axis arrangement, the calculated length and slenderness ratio of the main material are reduced, and the strength stress and stability stress of the main material during verification are significantly reduced; the outer jacket steel frame is connected with the original outer angle steel through welds to improve the safety performance at the nodes of the iron tower; the safety of the bottom of the iron tower is enhanced by increasing the height of the concrete guardrail; after the reinforcement is completed, the corrosion-resistant paint is applied to the whole to prevent the rods from rusting; the method of the present invention can not only effectively reduce the stress over-limit of the main material of the old welded iron tower, enhance the safety performance of the nodes of the old welded iron tower, and improve the bearing performance of the old welded iron tower, but also has the advantages of convenient construction, low cost and beautiful appearance.

[0067] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0068] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0069] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A reinforcement method for improving the bearing capacity of old welded iron towers, characterized in that The outer steel frame is composed of angle steel for main material reinforcement, angle steel for horizontal material reinforcement and node plate for reinforcement, including the following steps: Step 1: remove the paint film and rust residue on the outer surface of the original angle steel (1) of the tower to ensure that the surface of the original angle steel (1) is smooth; Step 2: drilling holes at the two ends of the main material reinforcement angle steel (2) and the original angle steel (1); Step 3: Drill a hole at one end of the angle steel (3) used for horizontal reinforcement; Step 4: Use bolts (4) to connect the main material reinforcement angle steel (2) and the transverse material reinforcement angle steel (3) with the tower main material original angle steel (1) to form an outer steel frame; Step 5: The end of the main material reinforcement angle steel (2) is welded to the end of the original outer angle steel (11); Step 6: Welding a reinforcement gusset plate (14) to the edges of the main material reinforcement angle steel (2) and the original outer angle steel (11); Step 7: pouring a new concrete guardrail (18) on the original concrete guardrail (17) at the bottom of the old welded iron tower; Step 8: After all reinforcement is completed, paint the entire rod with corrosion-resistant paint to prevent rust; The angle steel (3) for reinforcing the horizontal member is connected with the angle steel (2) for reinforcing the main member by bolts (4) to form an outer steel frame and the original angle steel (1) to form a whole. The angle steel (3) for reinforcing the horizontal member should be arranged at the equally divided point between the connection points of the original tower diagonal member (9) and the original angle steel (1), so that the arrangement of the original tower members is changed from parallel axis arrangement to minimum axis arrangement, thereby reducing the calculated length and slenderness ratio of the main member and reducing the stability stress during the main member verification. The reinforcement node plate (14) is connected to the main material reinforcement angle steel (2) and the original outer angle steel (11) through a weld (15), so that the upper and lower outer jacket steel frames of the original tower cross member (10) and the original outer angle steel (11) form a whole, thereby enhancing the safety performance of the connection node of the tower main member.

2. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The specifications of the angle steel (2) used for main material reinforcement are the same as the specifications of the original outer angle steel (11).

3. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The angle steel (3) used for reinforcing the horizontal material is an angle steel of L50×5 specification, and the angle steel (16) used for reinforcing the bottom horizontal material is an angle steel of L56×5 specification.

4. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The internal rounded corners (7) of the main material reinforcement angle steel (2) are ground to facilitate fitting with the original angle steel (1) to form a tight whole.

5. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The holes punched at the two ends of the main material reinforcement angle steel (2) and the original angle steel (1) are of the same size and aligned in position.

6. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The punching position of the angle steel (3) for reinforcing the horizontal material is at the place where it fits one limb of the angle steel (2) for reinforcing the main material.

7. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 6, characterized in that: The holes punched in the angle steel (3) for reinforcing the horizontal material are of the same size and aligned in position as the holes punched in the angle steel (2) for reinforcing the main material and the original angle steel (1).

8. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The angle steel (2) for main material reinforcement is connected and attached to the outside of the original angle steel (1) by bolts (4), thereby increasing the strength net cross-sectional area of ​​the main material of the iron tower and reducing the strength stress during the main material verification.

9. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The main material reinforcement angle steel (2) is connected to the original outer angle steel (11) through a weld (15).

10. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The thickness of the reinforcement node plate (14) is selected to be consistent with the thickness of the original external angle steel (11).

11. A reinforcement method for improving the bearing capacity of an old welded iron tower according to claim 1, characterized in that: The newly poured concrete guardrail (18) should have the bottom cross-member reinforcement angle steel (16) buried inside to enhance the safety performance of the bottom of the tower.

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