Method for constructing a steel structure bridge

Abstract

A method for constructing a steel structure bridge relates to the construction of a steel structure bridge, wherein two combined frames are respectively arranged at relative positions on the river banks on both sides of a river, the two ends of a "U"-shaped connecting plate (33) are respectively located in the "U"-shaped plate cavity D (19) respectively provided on the two "U"-shaped beam plates D (8), and the tops of the two "U"-shaped beam plates D (8) extending out of the cover plates are covered with connecting cover blocks (32) whose two ends are respectively fixed to the ends of the two cover plates; the present invention forms a "U"-shaped support frame by using a plurality of "U"-shaped beam plates to advance step by step when constructing the steel structure bridge, and forms a cover plate by covering the cover blocks between two adjacent "U"-shaped beam plates on the top of the "U"-shaped support frame. After the "U"-shaped support frame and the cover plate are connected, a combined frame is formed, and the combined frames are respectively arranged at relative positions on the river banks on both sides of the river and finally closed, thereby achieving the purpose of building a sturdy river-spanning bridge without setting support columns on the riverbed.

Description

Technical Field

[0001] The present invention relates to the construction of a steel structure bridge, in particular to a method for constructing a steel structure bridge. Background Art

[0002] Steel bridges, defined as bridges whose primary load-bearing structures are made of steel, are technically challenging, complex to construct, and require a high level of engineering expertise from implementing companies. This has led to a relatively small number of companies in the industry. Furthermore, since large-scale bridge projects are typically national or regional key projects, they place relatively high demands on the engineering experience and track record of steel structure companies. Furthermore, limitations on engineering technology, site size, equipment availability, personnel, and qualifications have resulted in a relatively small number of large-scale, specialized companies competing for these projects. This industry is characterized by relatively low market concentration and market-based competition. As a crucial component of bridge construction, the quality of steel structure completion directly impacts the overall construction schedule and quality, and thus the overall road and bridge project. Furthermore, the design service life of large-span bridges can often be decades or even centuries, placing stringent quality demands on project contractors. Traditional steel bridges are typically constructed from spliced ​​steel trusses, which comprise a large number of separate components. Furthermore, river crossings require the installation of piers at the riverbed, making construction difficult, time-consuming, and disruptive to the riverbed. During construction, due to different assembly techniques, the construction quality is uneven, the construction speed is slow, and the strength is not high. Summary of the Invention

[0003] In order to overcome the shortcomings of the background technology, the present invention discloses a method for constructing a steel structure bridge. When constructing the steel structure bridge, a plurality of "U"-shaped beams and plates are used to advance step by step to form a "U"-shaped support frame, and a cover plate is formed on the top of the "U"-shaped support frame in a manner of covering cover blocks between two adjacent "U"-shaped beams and plates. After the "U"-shaped support frame and the cover plate are connected, a combined frame is formed. The combined frames are respectively set at relative positions on the river banks on both sides of the river and finally closed, thereby achieving the purpose of building a sturdy river-spanning bridge without setting support columns on the riverbed.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] The invention relates to a method for constructing a steel structure bridge, wherein the structure includes a combined frame, which includes a base, a "U"-shaped support frame and a cover plate. The base is set on the river bank, and a groove with one end communicating with the outside is provided at the middle position of the top of the base. The "U"-shaped support frame includes a "U"-shaped beam plate A, a "U"-shaped beam plate B, a "U"-shaped beam plate C and a "U"-shaped beam plate D with successively smaller heads. One end of the "U"-shaped beam plate A is fixedly connected to the base. The "U"-shaped beam plate A is provided with a "U"-shaped plate cavity A which is connected to the groove. An inner flange A is provided on both side walls of the other end of the "U"-shaped beam plate A. The "U"-shaped beam plate B can be in the "U"-shaped plate cavity A. The U-shaped plate is folded inwards so that the "U" shaped plate cavity B is formed. The outer flange A at one end of the "U" shaped beam plate B contacts the inner flange A. The other end of the "U" shaped beam plate B extends to the outside of the "U" shaped beam plate A. The inner flange B is provided on both sides of the other end of the "U" shaped beam plate B. The "U" shaped beam plate C can slide in the "U" shaped plate cavity B provided in the "U" shaped beam plate B. The outer flange B at one end of the "U" shaped beam plate C contacts the inner flange B. The other end of the "U" shaped beam plate C extends to the outside of the "U" shaped beam plate B. The inner flange C is provided on both sides of the other end of the "U" shaped beam plate C. The "U" shaped beam plate D can slide in the "U" shaped plate cavity B provided in the "U" shaped beam plate C The U-shaped plate slides in the cavity C, and the outer flange C at one end of the "U"-shaped beam plate D is in contact with the inner flange C. The other end of the "U"-shaped beam plate D extends out of the "U"-shaped beam plate C. The cover plate includes a cover block A, a cover block B and a cover block C. A through groove A is provided at the bottom of the cover block A, an expansion neck groove A is provided at one end of the through groove A, a through groove B is provided at the bottom of the cover block B, an expansion neck groove B is provided at one end of the through groove B, a through groove C is provided at the bottom of the cover block C, an expansion neck groove C is provided at one end of the through groove C, the cross-sections of the through groove B and the expansion neck groove C are the same, the cross-sections of the through groove A and the expansion neck groove B are the same, the cover block A, the cover block B and the cover block C are connected in sequence, the through groove A, through groove B and through groove C are connected to form a tapered trough body with stepped walls on both sides. The cover plate covers the "U"-shaped support frame. The upper end of the "U"-shaped support frame is located in the tapered trough body. The end of the "U"-shaped beam plate D extends out of the cover plate. There are two combined frames, which are respectively set at relative positions on the river banks on both sides of the river. The two ends of the "U"-shaped connecting plate are respectively located in the "U"-shaped plate cavities D provided in the two "U"-shaped beam plates D. The tops of the two "U"-shaped beam plates D extending out of the cover plates are covered with connecting cover blocks with their two ends fixed to the ends of the two cover plates. The upper ends of the two "U"-shaped beam plates D extending out of the cover plates are both located in the through grooves D provided in the connecting cover blocks;

[0006] When the U-shaped beam plate is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate A is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate A is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate A is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate A is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate A is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate A is in the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate B is lifted and fixed to the upper portion of the upright position, the "U"-shaped beam plate A is lifted and fixed to the upper portion of the upright position. When the U-shaped beam plate is in the same position as the front, the "C"-shaped block is stuck in the "U"-shaped beam plate C. When the U-shaped beam plate is in the same position as the front, the "C"-shaped block is stuck in the "U"-shaped beam plate C. When the U-shaped beam plate is in the same position as the front, the "C"-shaped block is stuck in the "U"-shaped beam plate C. At the end, extend the electric telescopic rod until the outer flange B and the inner flange B at one end of the "U"-shaped beam C are in contact, weld the outer flange B and the inner flange B firmly, disengage the "C"-shaped block from the other end of the "U"-shaped beam C, retract the manual telescopic rod and the electric telescopic rod, use a crane to lift the cover block A to the top of the "U"-shaped beam A, cover the neck expansion groove A provided on the cover block A on the top of the "U"-shaped beam A, and cover the remaining through groove A on half of the top of the "U"-shaped beam B, weld the contact parts of the cover block A with the "U"-shaped beam A and the "U"-shaped beam B firmly, lift the "U"-shaped beam D with the crane, drive the crane to the top of the cover block A, lift the "U"-shaped beam D into the "U"-shaped beam C, and make the other end of the "U"-shaped beam D slightly protrude. The U-shaped beam C is moved, the trolley is moved to one end of the U-shaped beam B, the electric telescopic rod is extended to the top of the other end of the U-shaped beam D, the operator adjusts the manual telescopic rod so that the "C"-shaped block is stuck at the end of the other end of the U-shaped beam D, and the electric telescopic rod is extended until the outer flange C and the inner flange C at one end of the U-shaped beam D are in contact, the outer flange C and the inner flange C are welded firmly, and after lifting the cover block B with a crane, the crane is driven to the top of the cover block A, and the neck expansion groove B provided on the cover block B is covered on the top of the "U"-shaped beam B that is not covered by the cover block A, and the through groove B provided on the cover block B is covered on half of the top of the "U"-shaped beam C, and the contact parts of the cover block B with the "U"-shaped beam B and the "U"-shaped beam C are welded firmly.Separate the "C"-shaped block from the other end of the "U"-shaped beam plate D, retract the manual telescopic rod and the electric telescopic rod, move the trolley into the trench, lift the trolley out of the trench with a crane, lift the cover block C with the crane, and drive the crane to the top of the cover block B, and cover the expanded neck groove C of the cover block C on the top of the "U"-shaped beam plate C that is not covered by the cover block B, and cover the through groove C of the cover block C on half of the top of the "U"-shaped beam plate D, and weld the contact parts of the cover block C with the "U"-shaped beam plate C and the "U"-shaped beam plate D firmly. Set up two identical combination frames at the relative positions of the river banks on both sides according to the above steps, and lift the "U"-shaped beam plate D with a crane. The U-shaped connecting plate is moved to the top of one of the assembled cover blocks C, so that the two ends of the "U"-shaped connecting plate are respectively located in the "U"-shaped plate cavities D provided on the two "U"-shaped beam plates D and are welded firmly. The connecting cover block is lifted by a crane and moved to the top of one of the assembled cover blocks C. The connecting cover block is covered on the top of the two "U"-shaped beam plates D extending out of the cover plates. The upper ends of the two "U"-shaped beam plates D extending out of the cover plates are both located in the through grooves D provided on the connecting cover block. The connecting cover block and the ends of the two cover plates and the upper ends of the two "U"-shaped beam plates D extending out of the cover plates are all welded firmly. Concrete is poured into both grooves and maintained to complete the construction of the steel structure bridge.

[0007] The method for constructing a steel structure bridge comprises the following steps: a bottom of a trolley is provided with wheels that can be moved and fixed.

[0008] In the method for constructing a steel structure bridge, a locking screw is provided on the "C"-shaped block.

[0009] In the method for constructing a steel structure bridge, the cover block A, the cover block B, the cover block C and the connecting cover block are respectively hollow structures.

[0010] In the construction method of the steel structure bridge, anti-rust paint is applied to the exterior of the U-shaped support frame and the cover plate respectively.

[0011] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0012] The method for constructing a steel structure bridge described in the present invention uses a plurality of "U"-shaped beams and plates to advance step by step when constructing the steel structure bridge to form a "U"-shaped support frame, and forms a cover plate on the top of the "U"-shaped support frame in a manner of covering cover blocks between two adjacent "U"-shaped beams and plates, and the plurality of "U"-shaped beams and plates and the plurality of cover blocks are in staggered contact with each other. After the "U"-shaped support frame and the cover plate are connected, a combined frame is formed, and the combined frames are respectively set at relative positions on the river banks on both sides of the river, and finally closed, thereby achieving the purpose of building a sturdy river-spanning bridge without setting support columns on the riverbed; the present invention has a novel structure, strong operability, low construction cost, good use effect, and has promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the combined frame of the present invention;

[0014] Figure 2 This is a schematic diagram of the assembly structure of the combined rack of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of the base and the "U"-shaped support frame of the present invention;

[0016] Figure 4 This is a schematic structural diagram of the cover plate of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the trolley of the present invention;

[0018] Figure 6 This is a schematic structural diagram of a U-shaped beam plate B that is to be pushed and installed in a U-shaped beam plate A using an electric telescopic rod according to the present invention;

[0019] Figure 7 For the present invention Figure 6 Structural diagram from another perspective;

[0020] Figure 8 This is a schematic structural diagram of the electric telescopic rod of the present invention when the U-shaped beam plate B is pushed and installed in the U-shaped beam plate A;

[0021] Figure 9 This is a schematic structural diagram of a "U"-shaped beam plate C that is to be pushed and installed in a "U"-shaped beam plate B using an electric telescopic rod according to the present invention;

[0022] Figure 10 This is a structural diagram of the electric telescopic rod of the present invention when the U-shaped beam plate C is pushed and installed in the U-shaped beam plate B and covered with a cover block A;

[0023] Figure 11 This is a schematic structural diagram of a "U"-shaped beam plate D that is ready to be pushed and installed in a "U"-shaped beam plate C using an electric telescopic rod according to the present invention;

[0024] Figure 12 This is a structural diagram of the electric telescopic rod of the present invention when the U-shaped beam plate D is pushed and installed in the U-shaped beam plate C and covered with a cover block B;

[0025] Figure 13 This is a schematic diagram of the assembly structure of two sets of racks of the present invention;

[0026] Figure 14 It is a structural schematic diagram of the present invention when the construction is completed.

[0027] In the figure: 1, base; 2, "U" shaped beam plate A; 3, cover block A; 4, "U" shaped beam plate B; 5, cover block B; 6, "U" shaped beam plate C; 7, cover block C; 8, "U" shaped beam plate D; 9, neck expansion groove A; 10, through groove A; 11, neck expansion groove B; 12, through groove B; 13, neck expansion groove C; 14, through groove C; 15, groove; 16, "U" shaped plate cavity A; 17, "U" shaped plate cavity B; 18, "U"-shaped plate cavity C; 19. "U"-shaped plate cavity D; 20. Outer flange A; 21. Inner flange A; 22. Outer flange B; 23. Inner flange B; 24. Inner flange C; 25. Outer flange C; 26. Wheels; 27. Trolley; 28. Electric telescopic rod; 29. ​​"C"-shaped block; 30. Locking screw; 31. Manual telescopic rod; 32. Connecting cover block; 33. "U"-shaped connecting plate; 34. Through slot D. DETAILED DESCRIPTION

[0028] The present invention can be explained in more detail by the following examples. The present invention is not limited to the following examples. The purpose of the disclosure is to protect all changes and improvements within the scope of the present invention.

[0029] Combined with attachment Figures 1 to 4The structure of the steel structure bridge described in 13 includes a combined frame, which includes a base 1, a "U"-shaped support frame and a cover plate. The base 1 is set on the river bank, and a groove 15 is provided at one end thereof and communicated with the outside at the middle position of the top of the base 1. The "U"-shaped support frame includes a "U"-shaped beam A2, a "U"-shaped beam B4, a "U"-shaped beam C6 and a "U"-shaped beam D8, which are successively reduced in size. One end of the "U"-shaped beam A2 is fixedly connected to the base 1. The "U"-shaped beam A2 is provided with a "U"-shaped plate cavity A16 and the groove 15 passing through. Inner flanges A21 are provided on both side walls of the other end of the "U"-shaped beam A2. The "U"-shaped beam B4 can slide in the "U"-shaped plate cavity A16. The "U"-shaped beam B4 is provided with an outer flange at one end thereof. A20 contacts the inner flange A21, and the other end of the "U"-shaped beam plate B4 extends out of the "U"-shaped beam plate A2, and inner flanges B23 are provided on both side walls of the other end of the "U"-shaped beam plate B4. The "U"-shaped beam plate C6 can slide in the "U"-shaped plate cavity B17 provided in the "U"-shaped beam plate B4, and the outer flange B22 provided at one end of the "U"-shaped beam plate C6 contacts the inner flange B23, and the other end of the "U"-shaped beam plate C6 extends out of the "U"-shaped beam plate B4, and inner flanges C24 are provided on both side walls of the other end of the "U"-shaped beam plate C6. The "U"-shaped beam plate D8 can slide in the "U"-shaped plate cavity C18 provided in the "U"-shaped beam plate C6, and the outer flange C25 and inner flange C23 provided at one end of the "U"-shaped beam plate D8 The edges C24 are in contact, and the other end of the "U"-shaped beam plate D8 extends out of the "U"-shaped beam plate C6. The cover plate includes a cover block A3, a cover block B5 and a cover block C7. A through groove A10 is provided at the bottom of the cover block A3, and a neck expansion groove A9 is provided at one end of the through groove A10. A through groove B12 is provided at the bottom of the cover block B5, and a neck expansion groove B11 is provided at one end of the through groove B12. A through groove C14 is provided at the bottom of the cover block C7, and a neck expansion groove C13 is provided at one end of the through groove C14. The cross-sections of the through groove B12 and the neck expansion groove C13 are the same, and the cross-sections of the through groove A10 and the neck expansion groove B11 are the same. The cover block A3, the cover block B5 and the cover block C7 are connected in sequence, and the through groove A10, the through groove B12 and the through groove C14 are connected to form a cone with stepped walls on both sides. The trough body and the cover plate are covered on the "U"-shaped support frame. The upper end of the "U"-shaped support frame is located in the conical trough body, and the end of the "U"-shaped beam D8 extends out of the cover plate. There are two combined frames, which are respectively arranged at relative positions on the river banks on both sides of the river. The two ends of the "U"-shaped connecting plate 33 are respectively located in the "U"-shaped plate cavity D19 provided in the two "U"-shaped beams D8. The tops of the two "U"-shaped beams D8 extending out of the cover plates are covered with connecting cover blocks 32 whose two ends are respectively fixed to the ends of the two cover plates. The upper ends of the two "U"-shaped beams D8 extending out of the cover plates are both located in the through grooves D34 provided in the connecting cover blocks 32. The cover blocks A3, B5, C7 and 32 are hollow structures respectively, and the outsides of the "U"-shaped support frames and the cover plates are respectively coated with anti-rust paint.

[0030] The method for constructing a steel structure bridge according to the present invention is implemented as follows: during construction, a crane is driven to a connecting road outside the base 1, and the U-shaped beam plate A2 is lifted to the end of the base 1 by the crane, and one end of the U-shaped beam plate A2 is fixed to the base 1, so that the U-shaped plate cavity A16 provided on the U-shaped beam plate A2 and the groove 15 are connected, and the trolley 27 is lifted into the groove 15 by the crane and the trolley 27 is connected to the switch and the power supply respectively, and the attached Figure 5 An electric telescopic rod 28 is provided on one side of the trolley 27, a manual telescopic rod 31 extending downward is provided at the end of the electric telescopic rod 28, a "C"-shaped block 29 is provided at the lower end of the manual telescopic rod 31, a locking screw 30 is provided on the "C"-shaped block 29, and a wheel 26 that can be moved and fixed is provided at the bottom of the trolley 27. Figure 6 Or 7, use a crane to lift the "U" shaped beam plate B4 into the "U" shaped beam plate A2, so that the other end of the "U" shaped beam plate B4 slightly extends out of the "U" shaped beam plate A2, extend the electric telescopic rod 28 to the top of the other end of the "U" shaped beam plate B4, and the operator adjusts the manual telescopic rod 31 so that the "C" shaped block 29 is stuck at the end of the other end of the "U" shaped beam plate B4, combined with the attached Figure 8 , extend the electric telescopic rod 28 until the outer flange A20 and the inner flange A21 at one end of the "U"-shaped beam plate B4 are in contact, weld the outer flange A20 and the inner flange A21 firmly, separate the "C"-shaped block 29 from the other end of the "U"-shaped beam plate B4, retract the manual telescopic rod 31 and the electric telescopic rod 28, and combine with the attached Figure 9 After lifting the U-shaped beam C6 with a crane, move the crane to the top of the base 1, ride on the top of the groove 15, and lift the U-shaped beam C6 into the U-shaped beam B4, so that the other end of the U-shaped beam C6 slightly extends out of the U-shaped beam B4, move the trolley 27 to one end of the U-shaped beam A2, and extend the electric telescopic rod 28 to the top of the other end of the U-shaped beam C6. The operator adjusts the manual telescopic rod 31 so that the C-shaped block 29 is stuck at the end of the other end of the U-shaped beam C6. Combined with the attached Figure 10 , extend the electric telescopic rod 28 until the outer flange B22 and the inner flange B23 provided at one end of the "U"-shaped beam plate C6 are in contact, weld the outer flange B22 and the inner flange B23 firmly, separate the "C"-shaped block 29 from the other end of the "U"-shaped beam plate C6, retract the manual telescopic rod 31 and the electric telescopic rod 28, use a crane to lift the cover block A3 to the top of the "U"-shaped beam plate A2, cover the neck groove A9 provided on the cover block A3 on the top of the "U"-shaped beam plate A2, and cover half of the top of the "U"-shaped beam plate B4 with the remaining through groove A10, and weld the contact parts of the cover block A3 to the "U"-shaped beam plate A2 and the "U"-shaped beam plate B4 firmly, and combine with the attached Figure 11After lifting the U-shaped beam D8 with a crane, move the crane to the top of the cover block A3, lift the U-shaped beam D8 into the U-shaped beam C6, so that the other end of the U-shaped beam D8 slightly extends out of the U-shaped beam C6, move the trolley 27 to one end of the U-shaped beam B4, extend the electric telescopic rod 28 to the top of the other end of the U-shaped beam D8, and the operator adjusts the manual telescopic rod 31 so that the "C"-shaped block 29 is stuck at the end of the other end of the U-shaped beam D8, and extend the electric telescopic rod 28 until the outer flange C25 and the inner flange C24 provided at one end of the U-shaped beam D8 are in contact, and the outer flange C25 and the inner flange C24 are firmly welded together. Figure 12 After lifting the cover block B5 with a crane, move the crane to the top of the cover block A3, cover the expanded neck groove B11 of the cover block B5 on the top of the "U"-shaped beam plate B4 not covered by the cover block A3, cover the through groove B12 of the cover block B5 on half of the top of the "U"-shaped beam plate C6, weld the contact parts of the cover block B5 with the "U"-shaped beam plates B4 and "U"-shaped beam plates C6 firmly, separate the "C"-shaped block 29 from the other end of the "U"-shaped beam plate D8, retract the manual telescopic rod 31 and the electric telescopic rod 28, move the trolley 27 into the groove 15, and use the crane to lift the trolley 27 out of the groove 15, and combine with the attached Figure 13 After lifting the cover block C7 with a crane, move the crane to the top of the cover block B5, cover the expanded neck groove C13 of the cover block C7 on the top of the "U"-shaped beam plate C6 not covered by the cover block B5, and cover the through groove C14 of the cover block C7 on half of the top of the "U"-shaped beam plate D8. Weld the contact parts of the cover block C7 with the "U"-shaped beam plates C6 and "U"-shaped beam plates D8 firmly. Set up two identical combination frames at the relative positions of the river banks on both sides according to the above steps. In order to facilitate the removal of the two "C"-shaped blocks 29 after the two "U"-shaped beam plates D8 are installed, it is necessary to leave a gap between the two combination frames. Use a crane to lift the cover block C7. Lift the "U"-shaped connecting plate 33 and move it to the top of one of the combined cover blocks C7, so that the two ends of the "U"-shaped connecting plate 33 are respectively located in the "U"-shaped plate cavity D19 respectively provided on the two "U"-shaped beam plates D8 and are welded firmly. Use a crane to lift the connecting cover block 32 and move it to the top of one of the combined cover blocks C7, and cover the connecting cover block 32 on the top of the "U"-shaped beam plates D8 extending out of the cover plates. The upper ends of the "U"-shaped beam plates D8 extending out of the cover plates are both located in the through grooves D34 provided on the connecting cover block 32. Weld the connecting cover block 32 and the ends of the two cover plates and the upper ends of the "U"-shaped beam plates D8 extending out of the cover plates firmly. Figure 14 , pour concrete into both grooves 15 and maintain them to complete the construction of the steel structure bridge.

[0031] The parts not described in detail in this invention are prior art.

Claims

1. A method for constructing a steel structure bridge, characterized by: The structure includes a combined frame, which includes a base (1), a "U"-shaped support frame and a cover plate. The base (1) is set on the river bank, and a groove (15) with one end communicating with the outside is provided at the middle position of the top of the base (1). The "U"-shaped support frame includes a "U"-shaped beam plate A (2), a "U"-shaped beam plate B (4), a "U"-shaped beam plate C (6) and a "U"-shaped beam plate D (8) with decreasing sizes. One end of the "U"-shaped beam plate A (2) is fixedly connected to the base (1), and the "U"-shaped beam plate A (2) is provided with a "U"-shaped plate cavity A (16) and the groove (15) passing through. An inner flange A (21) is provided on both side walls of the other end of the "U"-shaped beam plate A (2), and the "U"-shaped beam plate B (4) can be in the "U"-shaped plate cavity A (16) ) slides in the "U" shaped beam plate B (4), the outer flange A (20) and the inner flange A (21) provided at one end of the "U" shaped beam plate B (4) are in contact, the other end of the "U" shaped beam plate B (4) extends to the outside of the "U" shaped beam plate A (2), and inner flanges B (23) are provided on both side walls of the other end of the "U" shaped beam plate B (4), the "U" shaped beam plate C (6) can slide in the "U" shaped plate cavity B (17) provided in the "U" shaped beam plate B (4), the outer flange B (22) and the inner flange B (23) provided at one end of the "U" shaped beam plate C (6) are in contact, the other end of the "U" shaped beam plate C (6) extends to the outside of the "U" shaped beam plate B (4), and inner flanges C (24) are provided on both side walls of the other end of the "U" shaped beam plate C (6), the "U" The U-shaped beam plate D (8) can slide in the U-shaped plate cavity C (18) provided in the U-shaped beam plate C (6), the outer flange C (25) provided at one end of the U-shaped beam plate D (8) and the inner flange C (24) are in contact, and the other end of the U-shaped beam plate D (8) extends outside the U-shaped beam plate C (6), and the cover plate includes a cover block A (3), a cover block B (5) and a cover block C (7), a through groove A (10) is provided at the bottom of the cover block A (3), a neck expansion groove A (9) is provided at one end of the through groove A (10), a through groove B (12) is provided at the bottom of the cover block B (5), a neck expansion groove B (11) is provided at one end of the through groove B (12), a through groove C (14) is provided at the bottom of the cover block C (7), and a neck expansion groove A (9) is provided at one end of the through groove C (14). A neck expansion groove C (13) is provided, the cross sections of the through groove B (12) and the neck expansion groove C (13) are the same, the cross sections of the through groove A (10) and the neck expansion groove B (11) are the same, the cover block A (3), the cover block B (5) and the cover block C (7) are connected in sequence, and the through groove A (10), the through groove B (12) and the through groove C (14) are connected to form a tapered groove body with stepped walls on both sides, the cover plate is covered on the "U"-shaped support frame, the upper end of the "U"-shaped support frame is located in the tapered groove body, the end of the "U"-shaped beam plate D (8) extends out of the cover plate, the combined frame is two, respectively set at relative positions on the river banks on both sides of the river, the two ends of the "U"-shaped connecting plate (33) are respectively located in the "U"-shaped plate cavity D (19) provided in the two "U"-shaped beam plates D (8),The top of the two U-shaped beams D (8) extending out of the cover plates is covered with a connecting cover block (32) whose two ends are respectively fixed to the ends of the two cover plates, and the upper ends of the two U-shaped beams D (8) extending out of the cover plates are both located in the through grooves D (34) provided in the connecting cover block (32); During construction, a crane is driven to a connecting road outside the base (1), and the "U"-shaped beam plate A (2) is lifted to the end of the base (1) by the crane, and one end of the "U"-shaped beam plate A (2) is fixed to the base (1), so that the "U"-shaped plate cavity A (16) provided in the "U"-shaped beam plate A (2) and the groove (15) are connected. The trolley (27) is lifted into the groove (15) by the crane, and the trolley (27) is connected to the switch and the power supply respectively. An electric telescopic rod (28) is provided on one side of the trolley (27), and a manual telescopic rod (31) extending downward is provided at the end of the electric telescopic rod (28). A "C"-shaped block (29) is provided at the lower end of the manual telescopic rod (31). The "U"-shaped beam plate B (4) is lifted to the "U"-shaped beam plate A (2) by the crane. The other end of the "U"-shaped beam plate B (4) is slightly extended from the "U"-shaped beam plate A (2), and the electric telescopic rod (28) is extended to the top of the other end of the "U"-shaped beam plate B (4). The operator adjusts the manual telescopic rod (31) so that the "C"-shaped block (29) is stuck at the end of the other end of the "U"-shaped beam plate B (4), and the electric telescopic rod (28) is extended until the outer flange A (20) and the inner flange A (21) provided at one end of the "U"-shaped beam plate B (4) are in contact, and the outer flange A (20) and the inner flange A (21) are firmly welded, and the "C"-shaped block (29) and the other end of the "U"-shaped beam plate B (4) are separated, and the manual telescopic rod (31) and the electric telescopic rod (28) are retracted, and the "U"-shaped beam plate C (6) is lifted by a crane. ), the crane is driven to the top of the base (1), riding on the top of the groove (15), and the "U"-shaped beam plate C (6) is lifted into the "U"-shaped beam plate B (4), so that the other end of the "U"-shaped beam plate C (6) slightly extends out of the "U"-shaped beam plate B (4), and the trolley (27) is moved to one end of the "U"-shaped beam plate A (2), and the electric telescopic rod (28) is extended to the top of the other end of the "U"-shaped beam plate C (6). The operator adjusts the manual telescopic rod (31) so that the "C"-shaped block (29) is stuck at the end of the other end of the "U"-shaped beam plate C (6), and the electric telescopic rod (28) is extended until the outer flange B (22) and the inner flange B (23) provided at one end of the "U"-shaped beam plate C (6) are in contact, and the outer flange B (22) and the inner flange B (23) are connected. B (23) are welded firmly, the "C"-shaped block (29) and the other end of the "U"-shaped beam plate C (6) are separated, the manual telescopic rod (31) and the electric telescopic rod (28) are retracted, and the cover block A (3) is lifted to the top of the "U"-shaped beam plate A (2) by a crane, and the expansion groove A (9) provided on the cover block A (3) is covered on the top of the "U"-shaped beam plate A (2), and the remaining through groove A (10) covers half of the top of the "U"-shaped beam plate B (4), and the contact parts of the cover block A (3) and the "U"-shaped beam plate A (2) and "U"-shaped beam plate B (4) are welded firmly, and after the "U"-shaped beam plate D (8) is lifted by a crane, the crane is driven to the top of the cover block A (3), and the "U"-shaped beam plate D (8) is lifted into the "U"-shaped beam plate C (6),The other end of the "U"-shaped beam plate D (8) is slightly extended from the "U"-shaped beam plate C (6), the trolley (27) is moved to one end of the "U"-shaped beam plate B (4), and the electric telescopic rod (28) is extended to the top of the other end of the "U"-shaped beam plate D (8). The operator adjusts the manual telescopic rod (31) so that the "C"-shaped clamping block (29) is clamped at the end of the other end of the "U"-shaped beam plate D (8), and the electric telescopic rod (28) is extended until the outer flange C (25) and the inner flange C (24) provided at one end of the "U"-shaped beam plate D (8) are in contact, and the outer flange C (25) and the inner flange C (24) are welded firmly. After the cover block B (5) is lifted by a crane, the crane is driven to the cover block. A (3) is covered on the top of the "U"-shaped beam plate B (4) which is not covered by the cover block A (3), and the through groove B (12) provided on the cover block B (5) is covered on half of the top of the "U"-shaped beam plate C (6). The contact parts of the cover block B (5) and the "U"-shaped beam plate B (4) and the "U"-shaped beam plate C (6) are welded firmly, and the "C"-shaped block (29) and the other end of the "U"-shaped beam plate D (8) are separated. The manual telescopic rod (31) and the electric telescopic rod (28) are retracted, and the trolley (27) is moved into the groove (15). The trolley (27) is lifted out of the groove (15) by a crane, and lifted by a crane. After the cover block C (7) is installed, the crane is driven to the top of the cover block B (5), and the expansion groove C (13) provided on the cover block C (7) is covered on the top of the "U"-shaped beam plate C (6) not covered by the cover block B (5), and the through groove C (14) provided on the cover block C (7) is covered on half of the top of the "U"-shaped beam plate D (8), and the contact parts of the cover block C (7) and the "U"-shaped beam plate C (6) and the "U"-shaped beam plate D (8) are welded firmly. Two identical combination frames are set up at relative positions on the river banks on both sides according to the above steps, and the "U"-shaped connecting plate (33) is lifted by the crane and driven to the top of the cover block C (7) provided on one of the combination frames to make the "U"-shaped connecting plate The two ends of the plate (33) are respectively located in the "U"-shaped plate cavity D (19) provided in the two "U"-shaped beam plates D (8) and are welded firmly. The connecting cover block (32) is lifted by a crane and moved to the top of the cover block C (7) provided on one of the combined frames. The connecting cover block (32) is covered on the top of the "U"-shaped beam plates D (8) extending from the two cover plates. The upper ends of the "U"-shaped beam plates D (8) extending from the two cover plates are both located in the through groove D (34) provided in the connecting cover block (32). The connecting cover block (32) and the ends of the two cover plates and the upper ends of the "U"-shaped beam plates D (8) extending from the two cover plates are welded firmly. Concrete is poured into the two grooves (15) and maintained to complete the construction of the steel structure bridge.

2. The method for constructing a steel structure bridge according to claim 1, wherein: The bottom of the trolley (27) is provided with wheels (26) that can be moved and fixed.

3. The method for constructing a steel structure bridge according to claim 1, wherein: A locking screw (30) is provided on the "C"-shaped block (29).

4. The method for constructing a steel structure bridge according to claim 1, wherein: The cover block A (3), the cover block B (5), the cover block C (7) and the connecting cover block (32) are respectively hollow structures.

5. The method for constructing a steel structure bridge according to claim 1, wherein: The outside of the "U"-shaped support frame and the cover plate are painted with anti-rust paint respectively.

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