A method for prefabricating support for π-shaped steel-concrete composite beams

Abstract

This invention provides a method for prefabricating and supporting π-shaped steel-concrete composite beams. The method utilizes a support platform for producing π-shaped steel-concrete composite beams. During production, two steel beams are supported one-to-one on steel support seats on two concrete protrusions. The left mold is supported on a left mold support track, the right mold on a right mold support track, and the middle mold on a middle mold support track. Concrete is then poured into the mold for casting the bridge deck to form the bridge deck. This invention aims to overcome the advantages of preventing ground subsidence when supporting the steel beams and facilitating the installation of support beams for lifting the π-shaped steel-concrete composite beams. It solves the problems of ground subsidence and inconvenient lifting associated with existing methods that directly place the beams on the ground for pouring.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for prefabricating support for π-shaped steel-concrete composite beams. Background Technology

[0002] In bridge construction, U-shaped steel-concrete composite beams are prefabricated in a prefabrication yard and then transported to the bridge piers by vehicles. The U-shaped steel-concrete composite beam includes a concrete bridge deck, a left steel beam, and a right steel beam. The lower surface of the bridge deck has longitudinally extending left and right convex bars. The left and right steel beams are distributed transversely and extend longitudinally. The left steel beam includes a left top plate, a left vertical plate, and a left bottom plate, which are connected in an "I" shape. The left top plate is fixed to the lower surface of the left convex bar. The right steel beam includes a right top plate, a right vertical plate, and a right bottom plate, which are also connected in an "I" shape. The right top plate is fixed to the right convex bar. However, this design can easily cause ground subsidence and is inconvenient for lifting. Summary of the Invention

[0003] The present invention aims to provide a prefabricated support method for π-shaped steel-concrete composite beams that is less prone to ground subsidence when supporting steel beams and has a support beam through the edge for lifting π-shaped steel-concrete composite beams. This method solves the problems of ground subsidence and inconvenience in lifting existing methods that involve directly placing the beams on the ground for casting.

[0004] To achieve the above-mentioned objectives, the present invention employs the following technology: a prefabricated support method for a π-shaped steel-concrete composite beam. The π-shaped steel-concrete composite beam includes a concrete bridge deck and two steel beams connected to the lower surface of the bridge deck. The two steel beams are distributed transversely and extend longitudinally. The method is characterized by support provided by a support platform for the production of the π-shaped steel-concrete composite beam. The support platform includes a hardened concrete surface and two concrete protrusions set on the hardened concrete surface. The two concrete protrusions are parallel, and the distance between the left and right steel beams is equal to the distance between the two concrete protrusions. A plurality of steel support seats are cast on the concrete protrusions, distributed along the extension direction of the concrete protrusions. A support is provided on the left side of the two concrete protrusions. The system includes a left-side mold support rail, a right-side mold support rail, and a middle mold support rail between two concrete protrusions. Both ends of the concrete protrusions have clearance grooves for the bottom support beams that lift the π-shaped steel-concrete composite beam. These grooves are perpendicular to the extension direction of the concrete protrusions and penetrate them. The molds for casting the bridge deck include a left-side mold, a middle mold, and a right-side mold. When producing the π-shaped steel-concrete composite beam, two steel beams are supported one-to-one on steel support seats on the two concrete protrusions. The left mold is supported on the left-side mold support rail, the right mold on the right-side mold support rail, and the middle mold on the middle mold support rail. Concrete is then poured into the molds to form the bridge deck. This technical solution uses multiple steel support seats, allowing independent control of each support seat, effectively providing full-span support and mitigating the subsidence of the hardened concrete surface.

[0005] Preferably, the left and right edges of the upper surface of the concrete protrusion are reinforced with angle steel. This prevents damage to the edges of the concrete protrusion during the process of the steel beam resting on the edge and then being pushed in.

[0006] Preferably, the steel support includes two H-beam segments extending perpendicular to the direction of the concrete ridge beam and several channel steel segments connecting the H-beams together. Each H-beam comprises an upper strip, a vertical strip, and a lower strip connected in an "I" shape. The lower strip rests flat on the concrete ridge beam and is cast together with it. This design provides good structural strength and reliable connection.

[0007] Preferably, the opening directions of the two channel steel sections are opposite to each other, the opening direction of the channel steel sections is horizontal, and the channel steel sections and the I-beam sections are welded together.

[0008] Preferably, the concrete protrusion contains two rows of horizontally extending reinforcing bars distributed in the vertical direction. The horizontally extending reinforcing bars in the same row are distributed perpendicular to the extension direction of the protrusion, and extend along the extension direction of the concrete protrusion. This improves structural strength.

[0009] Preferably, the horizontally extending reinforcing bars in the upper and lower rows are aligned one-to-one, and the aligned horizontally extending reinforcing bars are connected together by several vertical reinforcing bars, which are distributed along the extension direction of the concrete ridge. This can improve the structural strength.

[0010] Preferably, the horizontally extending reinforcing bars in the same row are connected together by several horizontal reinforcing bars, which are distributed along the extension direction of the concrete ridge and extend in a direction perpendicular to the concrete ridge. This can improve the structural strength.

[0011] Preferably, the system includes two vertical blocking pins that penetrate the upper slat, located at both ends of the I-beam segment along its length. These pins prevent the steel beam resting on the steel support from falling off. This effectively prevents the steel beam from falling.

[0012] Preferably, the system also includes two return springs. The vertical blocking pins are retractably mounted on the upper slat. The two return springs drive the two vertical blocking rods downwards until their upper ends are below the upper surface of the upper slat. The lower ends of the two vertical blocking pins rest on one end of two rocker arms, and the other ends of the rocker arms support the lower ends of two vertical trigger rods. The upper ends of the vertical trigger rods are mounted on the upper slat. When the steel support is in an unsupported state, the upper ends of the vertical blocking pins are below the upper surface of the upper slat, and the upper ends of the vertical trigger rods extend beyond the upper surface of the upper slat. When the steel beam is not positioned between the two vertical blocking pins, the vertical blocking pins are in a retracted, yielding state, thus avoiding interference with the movement of the steel beam onto the steel support. When the steel beam moves into position, it presses against the vertical trigger rods, causing the vertical blocking pins to rise and act as a stop.

[0013] Preferably, the two vertical barrier bars are threaded one-to-one through the two sections of the channel steel, and the steel support base is provided with a guide block, with the trigger rod passing through the guide block. This ensures good reliability during movement.

[0014] Beneficial effects: It can provide reliable support, and the support beam for lifting the π-shaped steel-concrete composite beam can be installed easily. Attached Figure Description

[0015] Figure 1 A top view of the support platform used in the production of π-shaped steel-concrete composite beams;

[0016] Figure 2 for Figure 1 A schematic diagram of a cross-section;

[0017] Figure 3 for Figure 1 A longitudinal sectional view;

[0018] Figure 4A schematic diagram showing the usage status of the support platform used in the production of π-shaped steel-concrete composite beams;

[0019] Figure 5 A schematic diagram of Embodiment 2 of a support platform for the production of π-type steel-concrete composite beams;

[0020] Figure 6 for Figure 5 A magnified view of a portion of point A.

[0021] In the diagram: 1. Bridge deck; 2. Left steel beam; 3. Right steel beam; 4. Hardened concrete ground; 5. Concrete ridge; 6. Steel support seat; 7. Left mold support rail; 8. Right mold support rail; 9. Middle mold support rail; 10. Clearance groove; 11. Angle steel; 12. I-beam segment; 13. Channel steel segment; 14. Upper strip; 15. Vertical strip; 16. Lower strip; 17. Horizontal extension reinforcement; 18. Vertical reinforcement; 19. Horizontal reinforcement; 20. Vertical blocking pin; 21. Return spring; 22. Stop block; 23. Seesaw; 24. Hinge shaft; 25. Vertical trigger rod; 26. Guide block. Detailed Implementation

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0023] See Figures 1 to 4 A method for prefabricating and supporting a π-shaped steel-concrete composite beam, wherein the π-shaped steel-concrete composite beam includes a concrete bridge deck 1 and two steel beams connected to the lower surface of the bridge deck. The two steel beams are distributed in the transverse direction of the bridge and extend in the longitudinal direction of the bridge. The two steel beams are a left steel beam 2 and a right steel beam 3.

[0024] The π-shaped steel-concrete composite beam is supported by a support platform for its production. The support platform includes a hardened concrete surface 4 and two parallel concrete protrusions 5 set on the hardened concrete surface. The distance between the left and right steel beams is equal to the distance between the two concrete protrusions. Several steel support seats 6 are cast on the concrete protrusions, distributed along the extension direction of the concrete protrusions. A left-side mold support rail 7 is provided on the left side of the two concrete protrusions, a right-side mold support rail 8 is provided on the right side, and a middle mold support rail 9 is provided between the two concrete protrusions. The platform has clearance grooves 10 at both ends, which are used to allow the bottom support beam of the π-shaped steel-concrete composite beam to pass through. The clearance grooves are perpendicular to the extension direction of the concrete protrusions and pass through the concrete protrusions. The mold for casting the bridge deck includes a left mold, a middle mold and a right mold. When producing the π-shaped steel-concrete composite beam, the two steel beams are supported one-to-one on the steel support seats on the two concrete protrusions. The left mold is supported on the left mold support track, the right mold is supported on the right mold support track, and the middle mold is supported on the middle mold support track. Then, concrete is poured into the mold to form the bridge deck.

[0025] Angle steel 11 is cast along the left and right edges of the upper surface of the concrete ridge strip as edging. The steel support includes two I-beam segments 12 extending perpendicular to the extension direction of the concrete ridge strip and several channel steel segments 13 connecting the I-beams. The I-beams include an upper strip 14, a vertical strip 15, and a lower strip 16 connected in an "I" shape. The lower strip rests flat on the concrete ridge strip and is cast together with it. The openings of the two channel steel segments face each other, and the openings of the channel steel segments are horizontal. The channel steel segments and the I-beam segments are welded together.

[0026] Example 2 differs from Example 1 in that:

[0027] See Figure 5 and Figure 6 Two rows of horizontally extending reinforcing bars 17 are cast within the concrete protrusion, distributed vertically. The horizontally extending reinforcing bars in the same row are distributed perpendicular to the extension direction of the protrusion and extend along the direction of the concrete protrusion. The horizontally extending reinforcing bars in the two rows are aligned one-to-one and connected together by several vertical reinforcing bars 18, which are distributed along the extension direction of the concrete protrusion. The horizontally extending reinforcing bars in the same row are connected together by several horizontal reinforcing bars 19, which are distributed along the extension direction of the concrete protrusion and extend perpendicular to the concrete protrusion.

[0028] The system includes two vertical blocking pins 20 that pass through the upper slat, located at both ends of the I-beam segment along its length. These pins prevent the steel beam resting on the steel support from falling. Two vertical blocking bars are correspondingly threaded onto the two channel steel segments. It also includes two return springs 21, each fitted onto one of the vertical blocking pins. The upper end of each spring abuts against the channel steel segment, and the lower end abuts against a stop block 22 located on the vertical blocking pin. The vertical blocking pins are retractably threaded through the upper slat, and the two return springs drive the two vertical blocking bars downwards until their upper ends are below the upper surface of the upper slat. The lower ends of the two vertical blocking pins rest on two rocker arms 23. Each rocker arm is hinged to the steel support via a hinge pin 24 at its center. The other ends of the two rocker arms are respectively supported on the lower ends of the two vertical trigger rods 25, and the upper ends of the vertical trigger rods are inserted through the upper slats. When the steel support base is in an unloaded state, the upper end of the vertical blocking pin is lower than the upper surface of the upper slats, and the upper end of the vertical trigger rod extends beyond the upper surface of the upper slats. The steel support base is provided with a guide block 26, and the trigger rod is inserted through the guide block.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for prefabricating and supporting a π-shaped steel-concrete composite beam, wherein the π-shaped steel-concrete composite beam comprises a concrete bridge deck and two steel beams connected to the lower surface of the bridge deck, the two steel beams being distributed transversely and extending longitudinally, characterized in that... The beams are supported by a support platform for the production of π-shaped steel-concrete composite beams. The support platform includes a hardened concrete surface and two parallel concrete protrusions on the surface. The distance between the left and right steel beams is equal to the distance between the two concrete protrusions. Several steel support seats are cast on the concrete protrusions, distributed along the extension direction of the concrete protrusions. A left-side mold support rail is provided on the left side of the two concrete protrusions, a right-side mold support rail is provided on the right side, and a middle mold support rail is provided between the two concrete protrusions. The two concrete protrusions... The end is provided with a clearance groove, which allows the bottom support beam for lifting the π-shaped steel-concrete composite beam to pass through. The clearance groove is perpendicular to the extension direction of the concrete protrusion and passes through the concrete protrusion. The mold for casting the bridge deck includes a left mold, a middle mold, and a right mold. When producing the π-shaped steel-concrete composite beam, the two steel beams are supported one-to-one on the steel support seats on the two concrete protrusions. The left mold is supported on the left mold support track, the right mold is supported on the right mold support track, and the middle mold is supported on the middle mold support track. Then, concrete is poured into the mold to form the bridge deck. Angle steel is cast along the left and right edges of the upper surface of the concrete ridge strip as edging. The steel support base includes two I-beam segments extending perpendicular to the extension direction of the concrete ridge strip and several channel steel segments connecting the I-beams. The I-beams include an upper strip, a vertical strip, and a lower strip connected in an "I" shape. The lower strip rests flat on the concrete ridge strip and is cast together with it. The support base also includes two vertical blocking pins penetrating the upper strip, distributed at both ends along the length of the I-beam segment. These vertical blocking pins prevent the steel beam resting on the steel support base from falling off. Two return springs are provided. The vertical blocking pins are telescopically inserted on the upper plate. The two return springs are used to drive the two vertical blocking pins downwards in a one-to-one correspondence until the upper end of the vertical blocking pin is lower than the upper surface of the upper plate. The lower ends of the two vertical blocking pins rest on one end of two rocker arms in a one-to-one correspondence. The other ends of the two rocker arms support the lower ends of two vertical trigger rods in a one-to-one correspondence. The upper ends of the vertical trigger rods are inserted on the upper plate. When the steel support is in an unloaded state, the upper ends of the vertical blocking pins are lower than the upper surface of the upper plate, and the upper ends of the vertical trigger rods extend beyond the upper surface of the upper plate. When the steel beam is not placed between the two vertical blocking pins, the vertical blocking pins are in a retracted and yielding state, thus avoiding interference with the movement of the steel beam onto the rigid support. When the steel beam moves into place, it presses against the vertical trigger rod, causing the vertical blocking pin to rise and play a blocking role.

2. The method for prefabricating support of a π-shaped steel-concrete composite beam according to claim 1, characterized in that, The two channel steel sections have openings facing each other, with the opening direction of the channel steel sections being horizontal. The channel steel sections and the I-beam sections are welded together.

3. A prefabricated support method for a π-shaped steel-concrete composite beam according to claim 1 or 2, characterized in that, The concrete protrusion has two rows of horizontally extending steel bars distributed in the vertical direction. The horizontally extending steel bars in the same row are distributed in a direction perpendicular to the extension of the protrusion and extend along the extension direction of the concrete protrusion.

4. The method for prefabricating support of a π-shaped steel-concrete composite beam according to claim 3, characterized in that, The horizontal extension bars in the upper and lower rows are aligned one-to-one, and the aligned horizontal extension bars are connected together by several vertical bars, which are distributed along the extension direction of the concrete convex strip.

5. The method for prefabricating support of a π-shaped steel-concrete composite beam according to claim 3, characterized in that, The horizontal extension bars in the same row are connected together by several horizontal bars. The horizontal bars are distributed along the extension direction of the concrete ridge bar and extend in a direction perpendicular to the concrete ridge bar.

6. A method for prefabricating support of a π-shaped steel-concrete composite beam according to claim 1 or 2, characterized in that, The two vertical blocking pins are inserted one-to-one on the two sections of the channel steel, and the steel support base is provided with a guide block, and the trigger rod is inserted into the guide block.

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