Pi-shaped steel-concrete composite beam prefabrication supporting method

Abstract

The invention provides a method for prefabricating and supporting a pi-shaped steel-concrete composite beam, which is characterized in that the pi-shaped steel-concrete composite beam is supported by a supporting pedestal for producing the pi-shaped steel-concrete composite beam, and when the pi-shaped steel-concrete composite beam is produced, two steel beams are supported on steel supporting seats on two concrete raised lines in a one-to-one correspondence manner; the left side mold is supported on the left side mold supporting track, the right side mold is supported on the right side mold supporting track, the middle mold is supported on the middle mold supporting track, and then concrete is poured into the mold for pouring the bridge deck slab to form the bridge deck slab. The lifting device has the advantages that ground depression is not prone to being generated when a steel beam is supported, and the pi-shaped steel-concrete composite beam can be conveniently lifted by arranging a joist in a penetrating mode, and the problems that ground depression is prone to being generated and lifting is inconvenient when the steel beam is directly placed on the ground for pouring in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a prefabricated support method for a π-shaped steel-concrete composite beam. Background Art

[0002] During bridge construction, the arched steel-concrete composite beam will be prefabricated in the prefabrication yard first, and then the arched steel-concrete composite beam will be transported to the bridge pier by vehicle. The arched steel-concrete composite beam includes a concrete structure bridge deck, a left steel beam and a right steel beam. The lower surface of the bridge deck is provided with a left convex strip and a right convex strip extending in the longitudinal direction of the bridge. The left steel beam and the right steel beam are distributed along the transverse direction and extend in the longitudinal direction of the bridge. The left steel beam includes a left top plate, a left vertical plate and a left bottom plate. The left top plate, the left vertical plate and the left bottom plate are connected together in an "I" shape. The left top plate is fixed on the lower surface of the left convex strip. The right steel beam includes a right top plate, a right vertical plate and a right bottom plate. The right top plate, the right vertical plate and the right bottom plate are connected together in an "I" shape. The right top plate is fixed on the right convex plate. Summary of the invention

[0003] The present invention aims to provide a method for prefabricating and supporting π-shaped steel-concrete composite beams, which is not prone to ground depression when supporting steel beams and has support beams passing through the edges for lifting the π-shaped steel-concrete composite beams, thereby solving the problems of the existing method of directly placing the beams on the ground for casting, which is prone to ground depression and inconvenience in lifting.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technology: a method for prefabricating and supporting π-shaped steel-concrete composite beams, wherein the π-shaped steel-concrete composite beam comprises a bridge deck of a concrete structure and two steel beams connected to the lower surface of the bridge deck, wherein the two steel beams are distributed in the transverse direction of the bridge and extend in the longitudinal direction of the bridge, and the beams are supported by a support pedestal for the production of π-shaped steel-concrete composite beams, wherein the support pedestal for the production of π-shaped steel-concrete composite beams comprises a concrete hardened ground surface and two concrete convex strips arranged on the concrete hardened ground surface, wherein the two concrete convex strips are parallel, and the distance between the left steel beam and the right steel beam is equal to the distance between the two concrete convex strips, and a plurality of steel support seats distributed along the extension direction of the concrete convex strips are cast on the concrete convex strips, and a support pedestal is arranged on the left side of the two concrete convex strips. There is a left mold support track and a right mold support track on the right side. A middle mold support track is provided between the two concrete convex strips. Avoidance grooves are provided at both ends of the concrete boss. The avoidance grooves are for the bottom support beams of the π-shaped steel-concrete composite beams to pass through. The avoidance grooves are perpendicular to the extension direction of the concrete convex strips and penetrate the concrete convex strips. 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 by one on the steel support seats on the two concrete convex strips. 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 in the mold for casting the bridge deck to form the bridge deck. This technical solution sets a plurality of steel support seats for support, and can independently control each steel support seat, which is equivalent to full support, and effectively alleviates the sinking of the concrete hardened ground.

[0005] Preferably, angle steels are cast on the left and right edges of the upper end surface of the concrete convex strip as the edge wrapping, so as to avoid the edge of the concrete convex strip being damaged during the process of the steel beam being placed on the edge and then pushed forward.

[0006] Preferably, the steel support seat comprises two I-beam sections extending perpendicularly to the extension direction of the concrete convex strip and a plurality of channel steel sections connecting the I-beams together, the I-beam comprises an upper slat, a vertical slat and a lower slat connected together in an "I" shape, the lower slat is placed flat on the concrete convex strip and cast together with the concrete convex strip, so as to have 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 section is horizontal, and the channel steel section and the I-beam section are welded together.

[0008] Preferably, two rows of horizontally extending steel bars distributed in the up-down direction are cast in the concrete convex strip, and the horizontally extending steel bars in the same row are distributed in a direction perpendicular to the extension direction of the boss, and the horizontally extending steel bars extend in the extension direction of the concrete convex strip, so as to improve the structural strength.

[0009] Preferably, the horizontally extending steel bars in the upper and lower rows of horizontally extending steel bars are aligned one by one, and the aligned horizontally extending steel bars are connected together by a plurality of vertical steel bars, and the vertical steel bars are distributed along the extension direction of the concrete convex strips, so as to improve the structural strength.

[0010] Preferably, the horizontally extending steel bars in the same row of horizontally extending steel bars are connected together by a plurality of horizontal steel bars, the horizontal steel bars are distributed along the extending direction of the concrete convex strips, and the horizontally extending steel bars extend in a direction perpendicular to the concrete convex strips, so as to improve the structural strength.

[0011] Preferably, two vertical blocking pins are provided which penetrate the upper slats and are distributed at both ends of the length direction of the I-beam section, and the vertical blocking pins are used to prevent the steel beam placed on the steel support seat from falling down, thereby preventing the steel beam from falling down.

[0012] As a preference, it further comprises two return springs, the vertical blocking pins are telescopically arranged on the upper slats, the two return springs are used to drive the two vertical blocking rods to move downwards one by one until the upper ends of the vertical blocking rods are lower than the upper surface of the upper slats, the lower ends of the two vertical blocking pins are correspondingly placed on one end of the two seesaw rods, the other ends of the two seesaw rods are correspondingly supported on the lower ends of the two vertical trigger rods, the upper ends of the vertical trigger rods are arranged on the upper slats; when the steel support seat is in an empty 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 exceeds the upper surface of the upper slats. When the steel beam is not placed between the two vertical blocking pins, the vertical blocking pin is in a retracted avoidance state, so as to avoid interfering with the movement of the steel beam to the steel support seat, and when the steel beam moves into place, it squeezes the vertical trigger rod, so that the vertical blocking pin rises and plays a blocking role.

[0013] Preferably, the two vertical blocking rods are correspondingly arranged on the two channel steel sections, a guide block is arranged on the steel support seat, and the trigger rod is arranged in the guide block, so that the reliability during movement is good.

[0014] Beneficial effects: reliable support can be provided, and the supporting beam for hoisting the π-shaped steel-concrete composite beam can be conveniently installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view schematic diagram of a support pedestal for the production of π-shaped steel-concrete composite beams; Figure 2 for Figure 1 A schematic cross-sectional view of Figure 3 for Figure 1 A longitudinal cross-sectional schematic diagram of Figure 4 This is a schematic diagram of the use status of the support pedestal for the production of π-shaped steel-concrete composite beams; Figure 5 It is a schematic diagram of a second embodiment of a support pedestal for producing π-shaped steel-concrete composite beams; Figure 6 for Figure 5 A local enlarged schematic diagram of point A.

[0016] In the figure: bridge deck 1, left steel beam 2, right steel beam 3, concrete hardened ground 4, concrete convex strip 5, steel support seat 6, left mold support rail 7, right mold support rail 8, middle mold support rail 9, avoidance groove 10, angle steel 11, I-beam section 12, channel steel section 13, upper slat 14, vertical slat 15, lower slat 16, horizontal extension steel bar 17, vertical steel bar 18, horizontal steel bar 19, vertical blocking pin 20, reset spring 21, block 22, seesaw lever 23, hinge shaft 24, vertical trigger rod 25, guide block 26. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figures 1 to 4 A π-shaped steel-concrete composite beam prefabricated support method, the π-shaped steel-concrete composite beam includes a bridge deck 1 of a concrete structure 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, and the two steel beams are a left steel beam 2 and a right steel beam 3.

[0019] The support is provided by a support pedestal for the production of π-shaped steel-concrete composite beams, which includes a concrete hardened ground surface 4 and two concrete convex strips 5 arranged on the concrete hardened ground surface, wherein the two concrete convex strips are parallel, and the distance between the left steel beam and the right steel beam is equal to the distance between the two concrete convex strips, and a plurality of steel support seats 6 distributed along the extension direction of the concrete convex strips are cast on the concrete convex strips, a left mold support track 7 is provided on the left side of the two concrete convex strips, and a right mold support track 8 is provided on the right side, and an intermediate mold support track 9 is provided between the two concrete convex strips. Both ends of the platform are provided with avoidance grooves 10 for the bottom supporting beam of the hoisted π-shaped steel-concrete composite beam to pass through, and the avoidance grooves pass through the concrete convex strips perpendicular to the extension direction of the concrete convex strips; 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 by one on the steel support seats on the two concrete convex strips, the left mold is supported on the left mold support rail, the right mold is supported on the right mold support rail, and the middle mold is supported on the middle mold support rail, and then concrete is poured in the mold for casting the bridge deck to form the bridge deck.

[0020] Angle steel 11 is cast on the left and right edges of the upper end surface of the concrete convex strip as a edging. The steel support seat includes two I-beam sections 12 extending perpendicularly to the extension direction of the concrete convex strip and a plurality of channel steel sections 13 connecting the I-beams together. The I-beam includes an upper slat 14, a vertical slat 15 and a lower slat 16 connected together in an "I" shape. The lower slat is placed flat on the concrete convex strip and cast together with the concrete convex strip. The opening directions of the two channel steel sections are opposite, the opening direction of the channel steel section is horizontal, and the channel steel section and the I-beam section are welded together.

[0021] Embodiment 2 is different from Embodiment 1 in that: See also Figure 5 and Figure 6 Two rows of horizontally extending steel bars 17 are cast in the concrete convex strips and distributed in the up-down direction. The horizontally extending steel bars in the same row are distributed in a direction perpendicular to the extension direction of the boss, and the horizontally extending steel bars extend in the extension direction of the concrete convex strips. The horizontally extending steel bars in the upper and lower rows of horizontally extending steel bars are aligned one by one, and the horizontally extending steel bars aligned up and down are connected together by a plurality of vertical steel bars 18, and the vertical steel bars are distributed in the extension direction of the concrete convex strips. The horizontally extending steel bars in the same row of horizontally extending steel bars are connected together by a plurality of horizontal steel bars 19, and the horizontal steel bars are distributed in the extension direction of the concrete convex strips, and the horizontally extending steel bars extend in a direction perpendicular to the concrete convex strips.

[0022] It includes two vertical blocking pins 20 that pass through the upper slats. The two vertical blocking pins are distributed at both ends of the length direction of the I-beam section. The vertical blocking pins are used to prevent the steel beam placed on the steel support seat from falling. The two vertical blocking rods are arranged on the two sections of the channel steel section in a one-to-one correspondence. It also includes two return springs 21. The return springs are arranged on the two vertical blocking pins in a one-to-one correspondence. The upper ends of the return springs are abutted with the channel steel section, and the lower ends are abutted with the stoppers 22 arranged on the vertical blocking pins. The vertical blocking pins are telescopically arranged on the upper slats. The two return springs are used to drive the two vertical blocking rods to move downward in a one-to-one correspondence until the upper ends of the vertical blocking rods are lower than the upper surface of the upper slats. The lower ends of the two vertical blocking pins are placed on the two seesaw rods 23 in a one-to-one correspondence. The middle parts of the two seesaw rods are hinged on the steel support seat through a hinge shaft 24. The other ends of the two seesaw rods are supported on the lower ends of the two vertical trigger rods 25 in a one-to-one correspondence, and the upper ends of the vertical trigger rods are inserted into the upper slats; when the steel support seat is in an empty 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 exceeds the upper surface of the upper slats. A guide block 26 is provided on the steel support seat, and the trigger rod is inserted into the guide block.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention 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 bridge deck of a concrete structure and two steel beams connected to the lower surface of the bridge deck, wherein the two steel beams are distributed in the transverse direction of the bridge and extend in the longitudinal direction of the bridge, and wherein: The support is provided by a support pedestal for the production of π-shaped steel-concrete composite beams, which includes a concrete hardened ground and two concrete convex strips arranged on the concrete hardened ground. The two concrete convex strips are parallel, and the distance between the left steel beam and the right steel beam is equal to the distance between the two concrete convex strips. A number of steel support seats distributed along the extension direction of the concrete boss are cast on the concrete convex strips. A left mold support track is provided on the left side of the two concrete convex strips, and a right mold support track is provided on the right side. A middle mold support track is provided between the two concrete convex strips. Avoidance grooves are provided at both ends for the bottom supporting beams of the hoisted π-shaped steel-concrete composite beams to pass through, and the avoidance grooves pass through the concrete convex strips perpendicular to the extension direction of the concrete convex strips; 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 by one on the steel support seats on the two concrete convex strips, the left mold is supported on the left mold support rail, the right mold is supported on the right mold support rail, and the middle mold is supported on the middle mold support rail, and then concrete is poured in the mold for casting the bridge deck to form the bridge deck.

2. A method for prefabricating and supporting a π-shaped steel-concrete composite beam according to claim 2, characterized in that: Angle steels are cast on the left and right edges of the upper end surface of the concrete convex strip as edging.

3. A method for prefabricating and supporting a π-shaped steel-concrete composite beam according to claim 2, characterized in that: The steel support seat includes two I-beam sections extending perpendicular to the extension direction of the concrete convex strip and a plurality of channel steel sections connecting the I-beams together. The I-beam includes an upper slat, a vertical slat and a lower slat connected together in an "I" shape. The lower half is placed flat on the concrete convex strip and cast together with the concrete convex strip.

4. A method for prefabricating and supporting π-shaped steel-concrete composite beams according to claim 3, characterized in that: The opening directions of the two channel steel sections are opposite to each other, the opening direction of the channel steel section is horizontal, and the channel steel section and the I-beam section are welded together.

5. A method for prefabricating and supporting π-shaped steel-concrete composite beams according to claim 1, 2, 3 or 4, characterized in that: Two rows of horizontally extending steel bars distributed in the up-and-down directions are cast in the concrete convex strips. The horizontally extending steel bars in the same row are distributed in a direction perpendicular to the extension direction of the boss, and the horizontally extending steel bars extend along the extension direction of the concrete convex strips.

6. A method for prefabricating and supporting π-shaped steel-concrete composite beams according to claim 5, characterized in that: The horizontally extending steel bars in the upper and lower rows of horizontally extending steel bars are aligned one by one, and the upper and lower aligned horizontally extending steel bars are connected together by a plurality of vertical steel bars, and the vertical steel bars are distributed along the extension direction of the concrete convex strips.

7. The method for prefabricating and supporting a π-shaped steel-concrete composite beam according to claim 5, characterized in that: The horizontally extending steel bars in the same row of horizontally extending steel bars are connected together by a plurality of horizontal steel bars, the horizontal steel bars are distributed along the extending direction of the concrete convex strips, and the horizontally extending steel bars extend in a direction perpendicular to the concrete convex strips.

8. A method for prefabricating and supporting π-shaped steel-concrete composite beams according to claim 3 or 4, characterized in that: It comprises two vertical blocking pins which penetrate the upper slats and are distributed at both ends of the length direction of the I-beam section. The vertical blocking pins are used to prevent the steel beam placed on the steel support seat from falling.

9. A method for prefabricating and supporting π-shaped steel-concrete composite beams according to claim 8, characterized in that: The two return springs are also included, the vertical blocking pins are telescopically arranged on the upper slat, and the two return springs are used to drive the two vertical blocking rods to move downwards one by one until the upper ends of the vertical blocking rods are lower than the upper surface of the upper slat, and the lower ends of the two vertical blocking pins are placed on one end of the two seesaw rods one by one, and the other ends of the two seesaw rods are supported on the lower ends of the two vertical trigger rods one by one, and the upper ends of the vertical trigger rods are arranged on the upper slat; when the steel support seat is in an empty state, the upper ends of the vertical blocking pins are lower than the upper surface of the upper slat, and the upper ends of the vertical trigger rods exceed the upper surface of the upper slat; When the steel beam is not placed between the two vertical blocking pins, the vertical blocking pins are in a retracted avoidance state, thereby avoiding interfering with the movement of the steel beam to the rigid support seat. When the steel beam moves into place, it squeezes the vertical trigger rod, causing the vertical blocking pin to rise and play a blocking role.

10. A method for prefabricating and supporting π-shaped steel-concrete composite beams according to claim 9, characterized in that: The two vertical blocking rods are correspondingly passed through the two channel steel sections, a guide block is provided on the steel support seat, and the trigger rod is passed through the guide block.

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