Optimized structure of steel guide beam

Abstract

A steel guide beam optimized structure belongs to the technical field of steel box beam incremental launching construction and comprises a guide beam body, the guide beam body comprises two opposite guide beam frames arranged in parallel, a truss structure is connected between the two guide beam frames, each guide beam frame is formed by welding a plurality of joist steel sections, and the joist steel sections are connected with the truss structure. The guide beam frame sequentially comprises a guide beam frame front section, a guide beam frame middle section and a guide beam frame rear section from front to back, the upper end of the guide beam frame rear section is a plane and used for being connected with the bottom of a rigid box beam, the top of the guide beam frame front section and the top of the guide beam frame middle section are both arc-shaped faces, and a guide mechanism is further welded to the front end of the guide beam frame front section. And an assembly type reinforcing structure is arranged at the welding seam of the adjacent I-shaped steel sections. The utility model discloses an optimized structure of a steel guide beam, which is simple in structure, convenient to manufacture, reliable in connection and good in stability by optimizing the structure of the steel guide beam, and can fully meet the requirements of stability, rigidity and deflection in the process of pushing a steel box beam.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel box girder pushing construction, and particularly relates to a steel guide beam optimized structure. BACKGROUND

[0002] Steel box girder pushing construction is an important technology in bridge construction, and has the advantages of fast construction speed and small influence on traffic. With the development of bridge pushing technology, the guide beam has become an indispensable device in the construction process.

[0003] In order to reduce the internal force of the main beam in the pushing process, increase the pushing span, and enhance the crossing capacity of the main beam, a temporary steel structure, i.e. the guide beam, is usually arranged at the front end of the main beam. Among them, the variable cross-section I-shaped steel guide beam has great advantages in stress and is convenient to construct, and is widely used in the construction of large and super large bridges.

[0004] However, the design of the guide beam has not yet formed a complete theoretical system, and the design of the guide beam according to the method of steel structure design is relatively complex. Therefore, the simplified design, manufacturing, connection and stability of the steel guide beam need to be innovated and optimized, and at the same time, the stress and stability, stiffness and deflection problems in the pushing process need to be ensured. CONTENT OF THE INVENTION

[0005] The present application discloses a steel guide beam optimized structure, which is simple in structure, convenient to manufacture, reliable in connection and good in stability by optimizing the steel guide beam structure, and can fully meet the stability, stiffness and deflection needs in the process of pushing the steel box girder.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows:

[0007] A steel guide beam optimized structure, comprising a guide beam body, the guide beam body comprising two guide beam frames arranged opposite to each other and parallel to each other, and a truss structure connected between the two guide beam frames, the guide beam frame being formed by segmentally welding a plurality of I-shaped steels, and comprising a guide beam frame front segment, a guide beam frame middle segment and a guide beam frame rear segment from front to back, the upper end of the guide beam frame rear segment being a plane for connecting with the bottom of the rigid box girder, the top of the guide beam frame front segment and the guide beam frame middle segment being arc surfaces, the front end of the guide beam frame front segment being further welded with a guide mechanism, and a fabricated reinforcing structure being arranged at the weld seam of adjacent I-shaped steel segments.

[0008] Preferably, an elliptical ventilation hole is arranged at the center of the web of the I-shaped steel segment.

[0009] Preferably, the arc-shaped surface comprises a first arc-shaped surface arranged on the top of the middle section of the guide beam frame and a second arc-shaped surface arranged on the top of the front section of the guide beam frame, and the first arc-shaped surface and the second arc-shaped surface are both formed by welding the arc-shaped upper flange plates of the I-beam sections.

[0010] Preferably, the top of the rear section of the guide beam frame is formed by welding the upper horizontal flange plates of the I-beam sections.

[0011] Preferably, the guide mechanism comprises vertical steel plates welded with the front ends of the front sections of the guide beam frames, and oblique steel plates arranged on the front sides of the vertical steel plates, the top of the vertical steel plate is welded with the top of the oblique steel plate, and the arc-shaped guide plates are welded between the bottom of the vertical steel plate and the bottom of the oblique steel plate, the height of the outer surface of the arc-shaped guide plate gradually increases relative to the bottom of the front section of the steel guide beam, and the inner surface of the arc-shaped guide plate is welded with the anti-deformation structure.

[0012] Preferably, the anti-deformation structure comprises first stiffening plates and second stiffening plates which are transversely and longitudinally arranged and welded with the inner surface of the arc-shaped guide plate.

[0013] Preferably, the vertical steel plates are welded with the front ends of two oppositely arranged front sections of the steel guide beams.

[0014] Preferably, the assembly type reinforcing structure comprises oppositely arranged top reinforcing plates and bottom reinforcing plates, the shape of the top reinforcing plate matches the shape of the upper flange plate of the I-beam section, two positioning grooves are respectively arranged on the opposite surfaces of the top reinforcing plate and the bottom reinforcing plate, the positioning grooves on the top and the bottom are opposite to each other, and the telescopic rods are connected between the positioning grooves on the top and the bottom.

[0015] Preferably, the telescopic rod comprises a first screw rod, a second screw rod and a sleeve, the inner surfaces of the two ends of the sleeve are provided with inner threads with opposite rotation directions, the ends of the first screw rod and the second screw rod are respectively screwed into the two ends of the sleeve, the other ends of the first screw rod and the second screw rod are respectively clamped into the positioning grooves on the top or the bottom, and the sleeve is rotated to move the first screw rod and the second screw rod towards or away from the sleeve.

[0016] Preferably, the assembly type reinforcing structure is respectively arranged between the upper flange plates and the lower flange plates on both sides of the welding seams of the adjacent I-beam sections, and is symmetrically arranged about the webs of the I-beam sections.

[0017] The steel guide beam with the optimized structure has the following advantages:

[0018] The steel guide beam structure is simple, convenient to manufacture, reliable in connection and good in stability, and can fully meet the stability, rigidity and deflection requirements in the process of pushing the steel box beam. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The side view structural schematic diagram of the new type.

[0020] Figure 2 The side view structural schematic diagram of the guide mechanism of the new type.

[0021] Figure 3 The structural schematic diagram of the inner surface of the arc-shaped guide plate of the new type after being unfolded.

[0022] Figure 4 The top view structural schematic diagram of the new type.

[0023] Figure 5 The installation structural schematic diagram of the assembled reinforcing structure of the new type.

[0024] 1, guide beam body; 2, guide beam frame; 21, guide beam frame one; 22, guide beam frame two; 3, guide mechanism; 31, oblique steel plate; 32, vertical steel plate; 4, truss structure; 5, ventilation hole; 6, I-beam section; 61, upper flange plate; 62, lower flange plate; 63, web plate; 7, steel guide beam bottom; 8, first arc surface; 9, second arc surface; 10, weld; 11, guide beam frame rear section; 12, guide beam frame middle section; 13, guide beam frame front section; 14, arc-shaped guide plate; 141, first stiffener; 142, second stiffener; 15, top reinforcing plate; 16, bottom reinforcing plate; 17, sleeve; 18, first screw rod; 19, second screw rod; 20, positioning groove. DETAILED DESCRIPTION

[0025] The following description is only a preferred embodiment of the new type and is not used to limit the protection scope of the new type, and any modification, equivalent replacement and improvement made within the spirit and principle of the new type should be included in the protection scope of the new type.

[0026] The following embodiments can be understood as a part of expressing the partial structure or method of the new type alone, or can be understood as mutually combined embodiments to explain the connotation of the structure or method of the new type in a larger range.

[0027] In the embodiment, a steel guide beam optimization structure is provided, which comprises a guide beam body, a guide beam frame and a guide mechanism. Figures 1-5As shown, including the guide beam body 1, the guide beam body 1 includes two opposite and parallel guide beam frame 2, 2 guide beam frame 2 between the truss structure 4 is connected, the guide beam frame 2 by several segments of I-beam segment 6 is welded, from front to back in turn including guide beam frame front section 13, guide beam frame middle section 12, guide beam frame rear section 11, the upper end of the guide beam frame rear section 11 is a plane, used to connect with the rigid box beam bottom, the top of the guide beam frame front section 13 and the guide beam frame middle section 12 are arc surface, the front end of the guide beam frame front section 13 is also welded with guide mechanism 3, the weld of adjacent I-beam segment 6 is provided with assembly type reinforcing structure, such as Figure 5 As shown. Among them, the truss structure 4 can be configured according to the needs of the truss that can realize the function, preferably the truss of cubic structure, each side of the truss is adopted several K-shaped link structure, to suppress the lateral deformation of steel guide beam.

[0028] In this embodiment, as shown in Figure 1 The web 63 of the I-beam segment 6 is provided with an elliptical ventilation hole 5 at the center, which can reduce the self weight of the steel guide beam and improve the wind resistance when used in high altitude.

[0029] In this embodiment, as shown in Figure 1 The arc surface includes the first arc surface 8 provided on the top of the guide beam frame middle section 12 and the second arc surface 9 provided on the top of the guide beam frame front section 13, and the first arc surface 8 and the second arc surface 9 are welded by the arc upper flange plate of the top of the I-beam segment 6. The first arc surface 8 and the second arc surface 9 can avoid stress concentration of the steel guide beam segment and improve the structural strength. At the same time, the first arc surface is lower than the height of the top of the guide beam frame rear section, and the second arc surface is lower than the height of the first arc surface, which can reduce the self weight of the steel guide beam while ensuring the structural strength.

[0030] In this embodiment, as shown in Figure 1 , 5 The top of the guide beam frame rear section 11 is welded by the upper horizontal flange plate of the I-beam segment 6, and the bottom of the guide beam frame front section 13, the guide beam frame middle section 12 and the guide beam frame rear section 11 is flush.

[0031] In this embodiment, as shown in Figure 1 , 2As shown in FIG. 3, the guiding mechanism 3 comprises a vertical steel plate 32 welded with the front end of the front section 13 of the guide beam frame, an inclined steel plate 31 arranged on the front side of the vertical steel plate 32, the top of the vertical steel plate 32 is welded with the top of the inclined steel plate 31, and an arc-shaped guiding plate 14 is welded between the bottom of the vertical steel plate 32 and the bottom of the inclined steel plate 31, the height of the outer surface of the arc-shaped guiding plate 14 gradually increases relative to the bottom of the front section 13 of the steel guide beam, and an anti-deformation structure is welded on the inner surface of the arc-shaped guiding plate 14. When the front section of the guide beam frame passes through the temporary pier, in order to avoid the passing obstacle caused by the drooping of the front section of the guide beam frame, the guiding mechanism is arranged, the arc-shaped guiding plate is in contact with the top of the temporary pier, and gradually transitions to the contact between the bottom of the front section of the steel guide beam and the temporary pier.

[0032] In this embodiment, as shown in FIG. 1, Figure 1 、 2 As shown in FIG. 3, the anti-deformation structure comprises a first stiffener 141 and a second stiffener 142 which are transversely and longitudinally arranged and welded with the inner surface of the arc-shaped guiding plate 14.

[0033] In this embodiment, as shown in FIG. 1, Figure 4 As shown in FIG. 3, the vertical steel plate 32 is welded with the front end of the two oppositely arranged front sections 13 of the steel guide beam, that is, the vertical steel plate 32 spans the steel guide beam.

[0034] In this embodiment, as shown in FIG. 1, Figure 1 、 5 As shown in FIG. 3, the assembly type reinforcing structure comprises a top reinforcing plate 15 and a bottom reinforcing plate 16 which are oppositely arranged, the shape of the top reinforcing plate 15 matches the shape of the upper flange plate of the I-beam section (that is, if the upper flange plate of the I-beam section is an arc-shaped plate, the top reinforcing plate is an arc-shaped plate structure which can be attached to the upper flange plate), two positioning grooves 20 are respectively arranged on the opposite surfaces of the top reinforcing plate 15 and the bottom reinforcing plate 16, the upper and lower positioning grooves 20 are opposite to each other, and an extension rod is connected between the upper and lower positioning grooves 20.

[0035] Further, the extension rod comprises a first screw rod 18, a second screw rod 19 and a sleeve 17, the inner surface of the sleeve 17 is provided with opposite threads at both ends, the ends of the first screw rod 18 and the second screw rod 19 are respectively screwed into the sleeve 17, the other ends of the first screw rod 18 and the second screw rod 19 are respectively clamped into the upper or lower positioning groove, the sleeve is rotated, the first screw rod and the second screw rod are simultaneously moved towards or away from the sleeve, so as to realize the close contact between the top reinforcing plate and the bottom reinforcing plate and the upper flange plate and the lower flange plate respectively, thereby strengthening the structural strength of the welding seam.

[0036] Further, the assembled reinforcing structures are respectively arranged between the upper flange plates and the lower flange plates on both sides of the weld 10 of the adjacent I-beam sections 6 and symmetrically arranged with respect to the webs of the I-beam sections. Of course, they can be arranged at positions where the strength of the structure needs to be reinforced according to the actual construction.

Claims

1. A steel girder optimization structure, characterized in that it comprises a girder body, the girder body comprises two opposite and parallel girder frames, and a truss structure is connected between the two girder frames; the girder frame is formed by segmentally welding a plurality of I-beams, and comprises a front segment, a middle segment and a rear segment from front to back; the upper end of the rear segment is a flat surface for connecting with the bottom of a rigid box girder; the top of the front segment and the middle segment are arc surfaces; a guide mechanism is welded to the front end of the front segment; and an elliptical ventilation hole is formed in the center of the web of the I-beam segment.

2. A steel girder optimization structure as claimed in claim 1, characterized in that: The arc surface comprises a first arc surface arranged on the top of the middle segment and a second arc surface arranged on the top of the front segment; the first arc surface and the second arc surface are both formed by welding the arc upper flange plates of the top of the I-beam segment; the height of the first arc surface is lower than the height of the top of the rear segment, and the height of the second arc surface is lower than the height of the first arc surface.

3. A steel girder optimization structure as claimed in claim 2, characterized in that: The top of the rear segment is formed by welding the upper horizontal flange plates of the I-beam segments; and the bottoms of the front segment, the middle segment and the rear segment are flush.

4. A steel girder optimization structure as claimed in claim 3, characterized in that: The guide mechanism comprises a vertical steel plate welded to the front end of the front segment and an inclined steel plate arranged on the front side of the vertical steel plate; the top of the vertical steel plate is welded to the top of the inclined steel plate; an arc guide plate is welded between the bottom of the vertical steel plate and the bottom of the inclined steel plate; the height of the outer surface of the arc guide plate gradually increases relative to the bottom of the front segment; and an anti-deformation structure is welded to the inner surface of the arc guide plate.

5. A steel girder optimization structure as claimed in claim 4, characterized in that: The anti-deformation structure comprises a first stiffener and a second stiffener which are transversely and longitudinally arranged and welded to the inner surface of the arc guide plate.

6. A steel girder optimization structure as claimed in claim 5, characterized in that: The vertical steel plate is welded to the front end of two opposite front segments.

7. A steel girder optimization structure as claimed in claim 6, characterized in that: The assembly type reinforcing structure comprises top reinforcing plates and bottom reinforcing plates which are arranged oppositely; the shape of the top reinforcing plate matches the shape of the upper flange plate of the I-beam segment; two positioning grooves are formed in the opposite surfaces of the top reinforcing plate and the bottom reinforcing plate; the positioning grooves on the top and the bottom are opposite to each other; and an extension rod is connected between the positioning grooves on the top and the bottom.

8. A steel girder optimization structure as claimed in claim 7, characterized in that: The extension rod comprises a first screw rod, a second screw rod and a sleeve; the inner surfaces of the two ends of the sleeve are provided with inner threads which are opposite in rotation direction; the ends of the first screw rod and the second screw rod are screwed into the two ends of the sleeve respectively; the other ends of the first screw rod and the second screw rod are clamped into the positioning grooves on the top or the bottom respectively; and the sleeve is rotated to move the first screw rod and the second screw rod towards or away from the sleeve.

9. A steel girder optimization structure as claimed in claim 8, characterized in that: The assembly type reinforcing structure is arranged between the upper flange plates and the lower flange plates on the two sides of the welding seam of the adjacent I-beam segments, and is symmetrically arranged with respect to the web of the I-beam segment.

10. A steel girder optimization structure as claimed in claim 9, characterized in that: ​

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