Cast-in-situ concrete cantilever flange plate steel composite beam bridge deck and construction method

Abstract

This invention relates to a cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck and its construction method, comprising the following steps: installing an adjustable movable formwork; installing brackets and cantilever formwork; installing side formwork; adjusting the formwork; integrally casting the bridge deck at the cantilever end on the same side and the bridge deck of the span section; and constructing the intermediate bridge deck section. The beneficial effects of this invention are: the steel formwork serves both as part of the span steel box girder structure and as a continuous, non-removable bottom formwork for casting the bridge deck, facilitating bridge deck casting construction; the cantilever end bridge deck on the same side and the bridge deck of the span section are integrally cast, avoiding quality problems caused by separate casting of the cantilever end in traditional processes, and improving the overall performance of the bridge deck; the intermediate bridge deck section is a pre-cast section, cast last, forming a function similar to a post-cast strip; the intermediate bridge deck section can be appropriately cast with micro-expansion concrete to benefit the overall performance of the bridge deck structure; the adjustable movable formwork is erected on the pre-cast section, resulting in a reasonable structure and saving space.

Description

Technical Field

[0001] This invention belongs to the field of steel-concrete composite beam bridge deck construction technology, and particularly relates to a cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck and its construction method. Background Technology

[0002] Steel-concrete composite girder bridges are mostly constructed using precast assembly methods, which involve first hoisting the main steel girder and then laying precast concrete bridge decks or casting-in-place concrete bridge decks. For the cantilever sections of the extensively used cast-in-place concrete bridge decks, construction is more difficult and the process relatively complex. Using conventional full-span scaffolding systems for cast-in-place bridge deck construction or wet-joint splicing would obstruct roads, disrupt traffic, and, more importantly, the significant stiffness difference between the cantilever section and the steel box girder section would severely affect the quality of concrete pouring. To address the concrete pouring issues in the cantilever sections, current methods generally involve installing suspended formwork above the steel box girder to suspend the bottom formwork or welding cantilever supports to the outer web of the steel box girder to support the cantilever section formwork. While these methods solve the problem of not being able to erect supports on the ground, they are structurally complex and difficult to install and dismantle. Therefore, there is an urgent need to propose a cast-in-place concrete cantilever flange steel-concrete composite girder bridge deck and its construction method to solve the aforementioned construction challenges of steel-concrete composite girder bridge decks. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck and its construction method.

[0004] The construction method for this type of cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck includes the following steps:

[0005] Step 1: Place a steel formwork on the top plate of the spandrel steel box girder, install a track in the reserved casting section between the spandrel bridge decks, and install a movable frame seat on the track; install a transverse main beam on the outer side of the movable frame seat; the two ends of the transverse main beam cantilever to the outside of the spandrel steel box girder.

[0006] Step 2: Install the adjusting short column and cantilever formwork under the cantilever end of the horizontal main beam using brackets;

[0007] Step 3: The side of the movable frame base is equipped with the side mold of the bridge panel of the span section through the support crossbar to form an adjustable movable mold frame;

[0008] Step 4: Slide the adjustable movable formwork along the track and slide the transverse main beam along the transverse through groove; adjust the bottom elevation of the cantilever formwork by adjusting the short columns; pour the cantilever end bridge deck and the segmented bridge deck as a whole.

[0009] As a preferred option, in step one, the adjustable movable formwork is set up on the upper part of the split steel box girder; after step four, there is also step five, which specifically involves removing the adjustable movable formwork in the reserved pouring section, pouring the middle section bridge deck, and forming the bridge deck by the cantilever end bridge deck, the split section bridge deck and the middle section bridge deck.

[0010] Preferably, in step one, the movable frame slides along the track, and the side of the movable frame has an anchoring end, through which a supporting crossbar is connected, and the other end of the supporting crossbar is fixed with a side mold.

[0011] Preferably, in step one, the movable frame is equipped with a column, and the upper part of the split steel box girder is provided with two tracks, each track is provided with two movable frames, the columns on the same track are connected by a connecting rod, and the corresponding movable frames on adjacent tracks are connected by a synchronous connecting rod.

[0012] Preferably, in step one, a column side plate is installed on the outer side of the column, and a horizontal main beam is installed on the column side plate. The horizontal main beam extends to the outer side of the two-section steel box main beams to form a cantilever end. A horizontal axis connecting rod and a horizontal axis are provided on the horizontal main beam. The column side plate has a transverse through groove that matches the horizontal axis. The horizontal axis moves relative to the transverse through groove.

[0013] Preferably, the column side plate has a transverse through groove that matches the horizontal main beam. In step four, the adjustable movable formwork is slid along the track to the set longitudinal position by using a winch as power, and the horizontal main beam is slid along the transverse through groove to the set transverse position.

[0014] Preferably, a support plate is installed under the cantilever end of the main beam, and a bracket is connected below the support plate. The bracket includes a horizontal bar, a diagonal bar, a side beam, an inner connecting rod, and an outer connecting rod. The top of the outer connecting rod is fixed below the support plate, and the bottom end is connected to one end of the horizontal bar. The other end of the horizontal bar is connected to the side beam, which is located on the outer side of the outer web. The two ends of the diagonal bar are connected to the side beam and the horizontal bar. An adjusting short column is installed on the horizontal bar, and the top of the adjusting short column supports the cantilever template of the cantilever end bridge deck. In step four, the cantilever template, the side formwork, and the steel formwork together form the template for casting the cantilever end bridge deck and the span bridge deck. The top surface elevation of the cantilever template and the steel formwork is consistent.

[0015] As a preferred option, in step four, the steel mold is installed on the top plate. The steel mold serves as both part of the structure of the segmented steel box girder and as a template for casting the segmented bridge deck and the intermediate bridge deck.

[0016] As a preferred option, in step five, after the cantilever end bridge deck and the span bridge deck are integrally cast, a reserved casting section is formed in the middle of the span bridge deck on both sides.

[0017] The cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck is obtained by any of the methods described above.

[0018] The beneficial effects of this invention are:

[0019] 1) The steel mold of the present invention serves as both part of the structure of the segmented steel box girder and as a continuous, non-removable bottom formwork for pouring the bridge deck, which facilitates the bridge deck pouring construction.

[0020] 2) In this invention, the cantilever end bridge deck and the segmented bridge deck on the same side are integrally cast, which avoids the quality problems caused by separate casting of the cantilever end in the traditional process and improves the overall performance of the bridge deck.

[0021] 3) This invention uses adjustable movable formwork and brackets to pour concrete for the cantilever end bridge deck, achieving rapid and accurate positioning of the cantilever formwork. The formwork structure system is safe and reliable, and easy to install and disassemble.

[0022] 4) The middle section of the bridge deck of this invention is a reserved pouring section, which is poured last and can form a function similar to a post-pouring strip. The middle section of the bridge deck can be appropriately poured with micro-expansion concrete to benefit the overall performance of the bridge deck structure. The adjustable movable formwork is set up on the reserved pouring section, which is reasonable in structure and saves space. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck structure of the present invention;

[0024] Figure 2 for Figure 1 Node A schematic diagram;

[0025] Figure 3 for Figure 1 Node B schematic diagram;

[0026] Figure 4 This is a schematic diagram showing the cantilever end bridge deck and the segmented bridge deck after they have been cast as a single piece.

[0027] Figure 5 This is a schematic diagram showing the bridge deck after it has been fully poured.

[0028] Explanation of reference numerals in the attached drawings: 1. Segmented steel box girder; 2. Crossbeam; 3. Bridge deck; 4. Inner web; 5. Outer web; 6. Bottom plate; 7. Top plate; 8. Lower crossbeam; 9. Upper crossbeam; 10. Cantilever end bridge deck; 11. Segmented bridge deck; 12. Reserved casting section; 13. Intermediate section bridge deck; 14. Steel formwork; 15. Track; 16. Movable frame; 17. Column; 18. Connecting rod; 19. Synchronous connecting rod; 20. Column side plate; 21. Horizontal main girder; 22. Horizontal axis; 23. Horizontal axis connecting rod; 24. Support plate; 25. Bracket; 26. Outer connecting rod; 27. Inner connecting rod; 28. Diagonal brace; 29. ​​Crossbeam; 30. Adjustable short column; 31. Anchorage end; 32. Supporting crossbeam; 33. Side formwork; 34. Cantilever formwork; 35. Side beam. Detailed Implementation

[0029] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0030] Example 1

[0031] As one example, such as Figures 1 to 5 As shown, the cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck includes two-span steel box girder 1, crossbeams 2 installed between the two-span steel box girder 1, and bridge deck 3; the two-span steel box girder 1 includes an inner web 4, an outer web 5, a bottom plate 6, a top plate 7, and a steel formwork 14; the crossbeam 2 includes a lower crossbeam 8 and an upper crossbeam 9; the bridge deck 3 includes a cantilever end bridge deck 10, a span section bridge deck 11, and a middle section bridge deck 13.

[0032] A steel mold 14 is installed on the top plate 7. The steel mold 14 serves as both part of the structure of the split steel box girder 1 and as a template for pouring the bridge deck.

[0033] The cantilever end bridge deck 10 and the segmented bridge deck 11 on the same side are integrally cast bridge decks. After the integrally cast bridge deck is completed, the middle section bridge deck 13 is cast in the reserved casting section 12.

[0034] Steel mold 14 was used for the concrete pouring of the bridge deck 11 of the span section, and adjustable movable mold and bracket 25 was used for the concrete pouring of the bridge deck 10 of the cantilever end.

[0035] An adjustable movable formwork is erected on the upper part of the segmented steel box girder 1, including: a track 15 set in the reserved casting section 12, a plurality of movable frame seats 16 installed on the track 15, the movable frame seats 16 can slide relative to the track 15; each movable frame seat 16 has a column 17; the plurality of columns 17 are respectively connected by synchronous connecting rods 19 and connecting rods 18; the outer side of the column 17 has a column side plate 20, a horizontal main beam 21 is installed on the column side plate 20, the horizontal main beam 21 extends to the cantilever ends on both sides, the horizontal main beam 21 has a horizontal axis connecting rod 23 and a horizontal axis 22, the column side plate 20 has a transverse through groove matching the horizontal axis 22, the horizontal axis 22 can move relative to the transverse through groove.

[0036] The adjustable movable mold frame is slid along the track 15 to the set longitudinal position using a winch as power, and the transverse main beam 21 is slid along the transverse through groove to the set transverse position.

[0037] The bracket 25 includes: a crossbar 29, a diagonal bar 28, a side beam 35, an inner connecting rod 27, an outer connecting rod 26, and a support plate 24 set under the cantilever end of the main beam 21. The support plate 24 directly connects the bracket 25 and the main beam 21. The crossbar 29 has an adjusting short column 30.

[0038] The cantilever formwork 34 is supported by the adjusting short column 30 on the bracket 25. The cantilever formwork 34 is used to pour concrete for the cantilever end bridge deck 10.

[0039] The movable frame 16 has an anchoring end 31 on its side, through which the supporting crossbar 32 and the side mold 33 are respectively connected.

[0040] The cantilever formwork 34, side formwork 33, and steel formwork 14 together form the formwork for casting the cantilever end bridge deck 10 and the segmented bridge deck. The top surface elevation of the cantilever formwork 34 and the steel formwork 14 is the same. After the cantilever end bridge deck 10 and the segmented bridge deck 11 are cast as a whole, a reserved casting section 12 is naturally formed in the middle.

[0041] Example 2

[0042] As another embodiment, this second embodiment, based on the first embodiment, proposes a construction method for a cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck, which includes the following steps:

[0043] Step 1: Install the adjustable movable formwork: The adjustable movable formwork is installed on the upper part of the main beam 1 of the split steel box girder.

[0044] S1. Steel mold 14 is installed on top plate 7. Steel mold 14 serves as both part of the structure of the spandrel steel box girder 1 and as a template for pouring the bridge deck. Rail 15 is installed in the reserved pouring section 12, and movable frame seat 16 is installed on rail 15; movable frame seat 16 can slide relative to rail 15.

[0045] S2. A column 17 is installed on each movable frame seat 16; multiple columns 17 are connected by a synchronous connecting rod 19 and a connecting rod 18. Specifically, the upper part of the split steel box girder 1 is provided with two tracks 15, and two movable frames 16 are provided on each track 15. The columns 17 on the same track 15 are connected by a connecting rod 18, and the corresponding movable frames 16 on adjacent tracks 15 are connected by a synchronous connecting rod 19.

[0046] S3. Install a column side plate 20 on the outer side of the column 17, install a horizontal main beam 21 on the column side plate 20, and install a horizontal axis connecting rod 23 and a horizontal axis 22 on the horizontal main beam 21. The horizontal main beam 21 extends to the cantilever ends on both sides. The horizontal main beam 21 has a horizontal axis connecting rod 23 and a horizontal axis 22. The column side plate 20 has a transverse through groove that matches the horizontal axis 22. The horizontal axis 22 can move relative to the transverse through groove.

[0047] Step 2: Install bracket 25 and cantilever formwork 34:

[0048] S1. Install a support plate 24 under the cantilever end of the transverse main beam 21.

[0049] S2. The bracket 25 is connected via the support plate 24. The bracket 25 includes a crossbar 29, a diagonal bar 28, a side beam 35, an inner connecting rod 27, and an outer connecting rod 26. The top end of the outer connecting rod 26 is fixed below the support plate 24, and the bottom end is connected to one end of the crossbar 29. The other end of the crossbar 29 is connected to the side beam 35, which is located on the outside of the outer web plate 5. The two ends of the diagonal bar 28 are connected to the side beam 35 and the crossbar 29.

[0050] S3. Install the adjusting short column 30 and the cantilever template 34 on the bracket 25. The adjusting short column 30 is installed on the crossbar 29, and the top of the adjusting short column 30 supports the cantilever template 34 of the cantilever end bridge panel 10.

[0051] Step 3: Install side mold 33:

[0052] The movable frame 16 has an anchoring end 31 on its side, through which the supporting crossbar 32 and the side mold 33 are respectively connected.

[0053] Step 4: Adjust the template:

[0054] S1. Using a winch as power, the adjustable movable mold frame is slid along the track 15 to the set longitudinal position, and the transverse main beam 21 is slid along the transverse through groove to the set transverse position.

[0055] S2. Adjust the bottom elevation of the cantilever template 34 by adjusting the short column 30 on the bracket 25.

[0056] The cantilever formwork 34, the side formwork 33, and the steel formwork 14 together form the template for casting the cantilever end bridge deck 10 and the segmented bridge deck 11. The top surfaces of the cantilever formwork 34 and the steel formwork 14 are at the same elevation.

[0057] Step 5: Integral casting of the cantilever end bridge deck 10 and the segmented bridge deck 11 on the same side.

[0058] The cantilever end bridge deck 10 and the segmented bridge deck 11 are integrally cast using cantilever formwork 34, steel mold 14, and side mold 33. After the cantilever end bridge deck 10 and the segmented bridge deck 11 on the same side are integrally cast, a reserved casting section 12 is naturally formed in the middle.

[0059] Step Six: Construction of the intermediate section of the bridge deck 13:

[0060] S1. Remove the aforementioned temporary structures within the reserved pouring section 12.

[0061] S2, pour the middle section of the bridge deck 13.

[0062] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction method for a cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck, characterized in that, Includes the following steps: Step 1: Place a steel formwork on the top plate of the spandrel steel box girder, install rails in the reserved casting section between the spandrel bridge decks, and install movable frame seats on the rails; install a transverse main beam on the outer side of the movable frame seat; the two ends of the transverse main beam cantilever to the outside of the spandrel steel box girder; install columns on the movable frame seat, and set two rails on the upper part of the spandrel steel box girder, with two movable frame seats on each rail. The columns on the same rail are connected by connecting rods, and the corresponding movable frame seats on adjacent rails are connected by synchronous connecting rods; install column side plates on the outer side of the columns, and install transverse main beams on the column side plates. The transverse main beams extend to the outer side of the spandrel steel box girder on both sides to form cantilever ends. The transverse main beams are equipped with transverse shaft connecting rods and transverse shafts. The column side plates have transverse through grooves that match the transverse shafts, and the transverse shafts move relative to the transverse through grooves; Step 2: Install the adjusting short column and cantilever formwork under the cantilever end of the horizontal main beam using brackets; Step 3: The side of the movable frame base is equipped with the side mold of the bridge panel of the span section through the support crossbar to form an adjustable movable mold frame; Step 4: Slide the adjustable movable formwork along the track and slide the transverse main beam along the transverse through groove; adjust the bottom elevation of the cantilever formwork by adjusting the short columns; pour the cantilever end bridge deck and the segmented bridge deck as a whole; install the steel formwork on the top plate, and the steel formwork serves as both part of the segmented steel box girder structure and as the template for pouring the segmented bridge deck and the intermediate bridge deck.

2. The construction method for cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck according to claim 1, characterized in that, In step one, the adjustable movable formwork is erected on the upper part of the spandrel steel box girder; after step four, there is also step five, which specifically involves removing the adjustable movable formwork in the reserved pouring section, pouring the middle section bridge deck, and forming the bridge deck by the cantilever end bridge deck, the spandrel bridge deck, and the middle section bridge deck.

3. The construction method for cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck according to claim 1, characterized in that, In step one, the movable frame slides along the track. The side of the movable frame has an anchoring end, through which a support crossbar is connected. The other end of the support crossbar is fixed with a side mold.

4. The construction method for cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck according to claim 1, characterized in that, In step four, the adjustable movable mold frame is slid along the track to the set longitudinal position using a winch, and the transverse main beam is slid along the transverse through groove to the set transverse position.

5. The construction method for cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck according to claim 1, characterized in that, A support plate is installed under the cantilever end of the main beam, and a bracket is connected below the support plate. The bracket includes a horizontal bar, a diagonal bar, a side beam, an inner connecting rod, and an outer connecting rod. The top of the outer connecting rod is fixed below the support plate, and the bottom end is connected to one end of the horizontal bar. The other end of the horizontal bar is connected to the side beam, which is located on the outer side of the outer web. The two ends of the diagonal bar are connected to the side beam and the horizontal bar. An adjusting short column is installed on the horizontal bar, and the top of the adjusting short column supports the cantilever template of the cantilever end bridge deck. In step four, the cantilever template, the side formwork, and the steel formwork together form the template for casting the cantilever end bridge deck and the span bridge deck. The top surface elevation of the cantilever template and the steel formwork is consistent.

6. The construction method for cast-in-place concrete cantilever flange steel-concrete composite beam bridge deck according to claim 2, characterized in that, In step five, after the cantilever end bridge deck and the span bridge deck are integrally cast, a reserved casting section is formed in the middle of the span bridge deck on both sides.

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