A large-span cap beam support system spanning an existing road and its use method

Abstract

A large-span cap beam support system and its use method for crossing an existing road include a bracket, a discharging device and a supporting frame; the bracket includes a bracket unit and a connecting beam; the bracket unit is arranged on both sides of the road; the discharging device includes a fixed cylinder, a discharging cylinder and an outer locking cylinder; the vertical section of the side wall of the upper half of the fixed cylinder is wedge-shaped; the vertical section of the side wall of the lower half of the discharging cylinder is wedge-shaped; the outer locking cylinder is connected between the fixed cylinder and the discharging cylinder; the inner surface of the outer locking cylinder is provided with an annular protrusion; the upper part of the inner surface of the annular protrusion is an inclined surface, and the lower part of the inner surface of the annular protrusion is an inclined surface; the outer locking cylinder includes an adjusting cylinder unit and an adjusting bolt; the supporting frame is installed on the supporting plate at the top of the bracket and includes a longitudinal beam, a main cross beam and a distribution beam. The present invention solves the problem that traditional full-span and few-bracket support systems cannot ensure normal traffic on the existing road below, and also solves the technical problem that non-ground-mounted brackets are affected by the cross-sectional form of the pier column, the bracket bearing capacity and the installation and processing quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of road engineering construction, and in particular relates to a large-span cap beam support system spanning an existing road and a method for using the system. Background Art

[0002] With China's rapid economic growth and rapid urban construction, major cities are facing insufficient transportation capacity. To address this issue, new elevated expressways are being constructed on existing roads, capitalizing on above-ground space to meet the needs of urban development. However, due to construction on existing roads, the viaduct's cap beam design typically adopts a long-span design to free up ground space. To ensure the normal traffic flow of the existing road below, construction is prohibited from using existing road space. Currently, prefabricated cap beam construction in China mainly uses full-span scaffolding, minimal scaffolding, and non-ground scaffolding. Full-span scaffolding can be categorized into various types based on the type of scaffolding used, with socket-and-spigot-type disc scaffolding currently being the most commonly used. Full-span scaffolding construction primarily relies on manual erection, but this method has drawbacks such as high foundation requirements, low mechanization, long installation and dismantling times, which impact construction speed, numerous components, and the potential for scattered and falling parts to cause traffic accidents. It occupies a large area of existing road, making it difficult to ensure normal traffic flow on the existing road below, slowing construction speed, and posing high safety risks. Low-profile scaffolding is constructed using a combination of various steel frames, typically arranged in rows. This construction will occupy existing roads and cannot guarantee existing traffic capacity. Non-ground-mounted scaffolding structures include hoop scaffolding, through-steel rod scaffolding, and embedded corbel scaffolding. Non-ground-mounted scaffolding is typically constructed using manual labor combined with machinery, eliminating the need for foundation preparation. This reduces construction steps and speeds up construction. However, its use is subject to certain restrictions due to factors such as the cross-sectional form of the pier, the scaffolding's bearing capacity, and the quality of installation and processing. Summary of the Invention

[0003] The purpose of the present invention is to provide a large-span cap beam support system and a method of use that crosses an existing road. It is to solve the problem that the traditional full-frame and few-bracket support systems cannot ensure the normal passage of the existing road below. At the same time, it is also to solve the technical problem that the non-ground-type bracket is affected by the pier column cross-section form, bracket bearing capacity and installation processing quality.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions.

[0005] A large-span cap beam support system spanning an existing road is used to support the formwork of the cap beam to be cast on the top of the pier, including a bracket, a discharge device and a support frame; there are two brackets, which are arranged on the front and rear sides of each row of piers respectively; each bracket includes a bracket unit and a connecting beam; there are two bracket units, which are respectively arranged on both sides of the road and corresponding to the piers; the bracket unit is an inverted isosceles triangle, and the upper ends of the two inclined columns of the bracket unit are respectively located on the left and right sides of the corresponding pier; the connecting beam connects the two bracket units accordingly; the discharge device is installed on the top of each inclined column, and includes a fixed cylinder, a discharge cylinder and an outer locking cylinder; the fixed cylinder is fixedly connected to the top of the inclined column, and includes a lower half of the fixed cylinder and an upper half of the fixed cylinder. half section; the vertical section of the side wall of the lower half section of the fixed cylinder is rectangular; the vertical section of the side wall of the upper half section of the fixed cylinder is wedge-shaped, and the outer surface of the upper half section of the fixed cylinder is an inclined surface gradually inclined inward from bottom to top; the unloading cylinder is arranged directly above the fixed cylinder, and comprises the lower half section of the unloading cylinder and the upper half section of the unloading cylinder; the vertical section of the side wall of the upper half section of the unloading cylinder is rectangular; the vertical section of the side wall of the lower half section of the unloading cylinder is wedge-shaped, and the outer surface of the lower half section of the unloading cylinder is an inclined surface gradually inclined inward from top to bottom; the outer locking cylinder is connected between the fixed cylinder and the unloading cylinder, and the upper hoop of the outer locking cylinder is provided on the outer surface of the lower half section of the unloading cylinder, and the lower hoop of the outer locking cylinder is provided on the outer surface of the upper half section of the fixed cylinder; the top of the unloading cylinder exceeds the outer locking cylinder The top of the cylinder is provided with a bottom of the outer locking cylinder, and an annular protrusion is provided on the inner surface of the outer locking cylinder, corresponding to the fixed cylinder and the unloading cylinder; the upper part of the inner surface of the annular protrusion is an inclined surface that fits the outer surface of the lower half of the unloading cylinder, and the lower part of the inner surface of the annular protrusion is an inclined surface that adapts to the outer surface of the upper half of the fixed cylinder; the outer locking cylinder includes an adjusting cylinder unit and an adjusting bolt; there are two adjusting cylinder units, and the horizontal section of the adjusting cylinder unit is semicircular; vertical connecting plates are respectively provided on the vertical sides of the adjusting cylinder unit, and perforations are provided on the vertical connecting plates at vertical intervals; the two adjusting cylinder units are spliced and connected, and connected by adjusting bolts provided in the perforations; the top of the unloading cylinder is connected with a support Support plate; the support bracket is installed on the support plate at the top of the two brackets, and includes a longitudinal beam, a main cross beam and a distribution beam; there is a group of longitudinal beams, which are placed on the support plates corresponding to the longitudinal directions of the top of the two brackets, and a longitudinal beam limiting cover is provided on the support plate, which is located on the outer side of the longitudinal beam; the longitudinal beam limiting cover is connected to the longitudinal beam by a first bolt; there are two main cross beams, which are respectively arranged on the longitudinal beam limiting covers on the top of the two brackets, and each main cross beam is detachably connected to the longitudinal beam limiting cover corresponding in the transverse direction; there is a group of distribution beams, which are arranged at intervals in the transverse direction, and each distribution beam is placed on the two main cross beams in the longitudinal direction; and a distribution beam limiting cover is provided on the outer side of the distribution beam, corresponding to the main cross beam; the distribution beam and the distribution beam limiting cover are connected by a second bolt.

[0006] Preferably, the bottom end of the bracket unit is connected to a flange; U-shaped anchor rods are interspersed on the flange; the lower part of the U-shaped anchor rod extends into the foundation below the bracket unit, and the lower end of the U-shaped anchor rod is bent horizontally to form an anchoring section; the upper end of the U-shaped anchor rod is provided with a thread, and is anchored to the flange by a nut.

[0007] Preferably, the upper ends of the two inclined columns of the bracket unit are both beyond the top of the transverse connecting beam of the bracket unit; the upper ends of the inclined columns are provided with horizontal connecting plates; and the fixing tube is connected to the horizontal connecting plates.

[0008] Preferably, the fixing tube is made of a steel pipe and is filled with concrete; the height of the fixing tube is 30-40 cm, the height of the upper half of the fixing tube is 15-20 cm, and the slope angle of the outer surface of the upper half of the fixing tube is 60-75°.

[0009] Preferably, the unloading tube is made of steel pipe, and the inside of the unloading tube is filled with concrete; the height of the unloading tube is 30-40 cm, the height of the lower half of the unloading tube is 15-20 cm, and the slope angle of the outer surface of the lower half of the unloading tube is 60-75°.

[0010] Preferably, the height of the annular protrusion is not less than 40 cm; the thickness of the annular protrusion is not less than 1 cm.

[0011] Preferably, the cross-section of the longitudinal beam limit cover is an inverted U-shape, and the two ends of the bottom of the longitudinal beam limit cover are bent horizontally outward to form a first folded edge; the first folded edge is supported on the support plate and is detachably connected to the support plate; the material of the longitudinal beam limit cover is adapted to the material of the longitudinal beam, and the strength of the longitudinal beam limit cover is not lower than the strength of the longitudinal beam.

[0012] Preferably, the cross-section of the distribution beam limit cover is an inverted U-shape, and the two ends of the bottom of the distribution beam limit cover are bent outward horizontally to form a second folded edge; the second folded edge is supported on the main beam and is detachably connected to the main beam; the material of the distribution beam limit cover is adapted to the material of the distribution beam, and the strength of the distribution beam limit cover is not lower than the strength of the distribution beam.

[0013] A method for using a large-span cap beam support system across an existing road comprises the following steps.

[0014] Step 1: Punch holes in the steel plate to make flanges, and cut the steel pipe piles into inclined columns according to the designed size.

[0015] Step 2: Weld the two inclined columns and the flange firmly, and connect the transverse connecting beam between the upper ends of the two inclined columns to form a bracket unit.

[0016] Step three: connect the brackets on both sides of the pier using longitudinal connections.

[0017] Step 4: Install the unloading device on the bracket unit.

[0018] Step 5: Place the longitudinal beam on the support plate, and provide a longitudinal beam limiting cover on the support plate and on the outer side of the longitudinal beam.

[0019] Step 6. Use U-shaped bolts to fix the main beam to the longitudinal beam limit cover.

[0020] Step seven: Install the distribution beam limit cover on the main crossbeam, and pass the longitudinal beam through the corresponding distribution beam limit cover in the longitudinal direction.

[0021] Step eight, use a crane to lift the large-span cap beam support system as a whole, and connect the large-span cap beam support system to the foundation.

[0022] Step nine, laying the cap beam formwork to be cast on the top of the large-span cap beam support system, so that the top of the pier extends above the cap beam bottom formwork and is located in the cap beam to be cast;.

[0023] Step 10: Complete the binding of cap beam reinforcement and pouring of cap beam concrete.

[0024] Step 11: After the strength of the cap beam concrete reaches the requirement and the prestressed steel bars in the cap beam are tensioned, loosen the adjusting bolts to allow the unloading tube to descend evenly; the unloading tube descends at a uniform speed in multiple times, and the unloading tube descends once each time the adjusting bolts are loosened.

[0025] Step 12, then remove the cap beam formwork.

[0026] Step 13: Unscrew the second bolt and pull the distribution beam out of the distribution beam limit cover.

[0027] Step 14: Remove the main beam.

[0028] Step 15: Unscrew the first bolt and pull the longitudinal beam out of the longitudinal beam limit cover.

[0029] Step 16: Release the longitudinal connection between the brackets on both sides of the pier and hoist the bracket as a whole to the next hole cover beam.

[0030] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0031] 1. In this case, the present invention can be used to achieve rapid construction of the cap beam, and the support system is completely set up in the green belt area to ensure that the original road is not occupied and vehicles can pass normally, alleviating traffic pressure during construction, and ensuring the safety of passing vehicles through the lower assembled protective shed; in addition, this support system has strong adaptability and can be flexibly adjusted according to the width and erection height of the viaduct cap beam.

[0032] 2. This support system can simplify the installation, dismantling, and transportation of the cap beam support system, while meeting construction safety requirements. It is easy and quick to move into place and can be used flexibly. This support system is easy to install and dismantle, easy to move, and has low cost. The method of use is easy to master.

[0033] 3. The large-span cap beam support system of the present invention is provided with a unloading device, which includes an outer locking cylinder, an unloading cylinder and a fixed cylinder. The outer locking cylinder locks the unloading cylinder and the fixed cylinder. At the same time, the present invention provides a wedge structure at the lower part of the unloading cylinder and the upper part of the fixed cylinder. After the outer locking cylinder is loosened, the unloading cylinder automatically slides down under pressure, thereby realizing the unloading of the bracket. The use method is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Figure 1 It is a front structural schematic diagram of the large-span cap beam support system of the present invention.

[0036] Figure 2 It is a side structural schematic diagram of the large-span cap beam support system of the present invention.

[0037] Figure 3 It is a schematic diagram of the connection structure of the regulating cylinder unit in the present invention.

[0038] Figure 4 It is a structural schematic diagram of the unloading tube in the present invention.

[0039] Figure 5 It is a schematic diagram of the connection structure between the distribution beam and the main beam in the present invention.

[0040] Figure 6 It is a structural schematic diagram of the outer locking cylinder in the present invention.

[0041] Figure 7 It is a structural schematic diagram of the outer locking cylinder wrapped around the unloading cylinder and the fixing cylinder in the present invention.

[0042] Figure 8 It is a schematic diagram of the connection structure between the flange and the foundation in the present invention.

[0043] Figure 9 It is a structural schematic diagram of the bracket unit in the present invention.

[0044] Figure 10 It is a structural schematic diagram of a longitudinal beam provided on the top of the unloading device in the present invention.

[0045] Figure 11 It is a structural schematic diagram of the fixed cylinder in the present invention.

[0046] Figure numerals: 1-pillar, 2-bracket, 2.1-bracket unit, 2.1.1-inclined column, 2.1.2-transverse connecting beam, 2.2-connecting beam, 3-fixed tube, 3.1-lower half of fixed tube, 3.2-upper half of fixed tube, 4-unloading tube, 4.1-lower half of unloading tube, 4.2-upper half of unloading tube, 5-annular protrusion, 6-vertical connecting plate, 7-perforation, 8-support plate, 9-longitudinal beam, 10 - Main crossbeam, 11 - Distribution beam, 12 - Longitudinal beam limit cover, 13 - First bolt, 14 - Distribution beam limit cover, 15 - Second bolt, 16 - Cap beam, 17 - Sealing plug, 18 - Flange, 19 - U-shaped anchor rod, 20 - Foundation, 21 - Horizontal connecting plate, 22 - First folding edge, 23 - Second folding edge, 24 - Outer locking cylinder, 24.1 - Adjustment cylinder unit, 24.2 - Adjustment bolt. DETAILED DESCRIPTION

[0047] like Figure 1-11As shown, this large-span cap beam support system spanning an existing road is used to support the formwork of the cap beam 16 to be cast on the top of the pier 1, and includes a bracket 2, a discharge device and a support frame; there are two brackets 2, which are arranged on the front and rear sides of each row of piers 1 respectively; each bracket 2 includes a bracket unit 2.1 and a connecting beam 2.2; there are two bracket units 2.1, which are respectively arranged on both sides of the road and corresponding to the pier 1; the bracket unit 2.1 is an inverted isosceles triangle, and the upper ends of the two inclined columns 2.1.1 of the bracket unit 2.1 are respectively located on the left and right sides of the corresponding pier 1; the connecting beam 2.2 connects the two bracket units 2.1 accordingly; the discharge device is installed on each inclined column 2.1.1 The top of the slanted column 2.1.1 includes a fixed cylinder 3, a discharging cylinder 4 and an outer locking cylinder 24; the fixed cylinder 3 is fixedly connected to the top of the inclined column 2.1.1, and includes a fixed cylinder lower section 3.1 and a fixed cylinder upper section 3.2; the side wall vertical section of the fixed cylinder lower section 3.1 is rectangular; the side wall vertical section of the fixed cylinder upper section 3.2 is wedge-shaped, and the outer surface of the fixed cylinder upper section 3.2 is an inclined surface gradually inclined inward from bottom to top; the discharging cylinder 4 is arranged directly above the fixed cylinder 3, and includes a discharging cylinder lower section 4.1 and a discharging cylinder upper section 4.2; the side wall vertical section of the discharging cylinder upper section 4.2 is rectangular; the side wall vertical section of the discharging cylinder lower section 4.1 is wedge-shaped, and the discharging cylinder lower section 4.2 is 1 is an inclined surface that gradually tilts inward from top to bottom; the outer locking cylinder 24 is connected between the fixed cylinder 3 and the unloading cylinder 4, and the upper hoop of the outer locking cylinder 24 is arranged on the outer surface of the lower half 4.1 of the unloading cylinder, and the lower hoop of the outer locking cylinder 24 is arranged on the outer surface of the upper half 3.2 of the fixed cylinder; the top of the unloading cylinder 4 exceeds the top of the outer locking cylinder 24; the bottom of the fixed cylinder 3 exceeds the bottom of the outer locking cylinder 24; an annular protrusion 5 is provided on the inner surface of the outer locking cylinder 24, corresponding to the fixed cylinder 3 and the unloading cylinder 4; the upper part of the inner surface of the annular protrusion 5 is an inclined surface that fits with the outer surface of the lower half 4.1 of the unloading cylinder, and the lower part of the inner surface of the annular protrusion 5 is an inclined surface that fits with the outer surface of the upper half 3.2 of the fixed cylinder. The outer surface has an adapted inclined surface; the outer locking cylinder 24 includes an adjusting cylinder unit 24.1 and an adjusting bolt 24.2; there are two adjusting cylinder units 24.1, and the horizontal section of the adjusting cylinder unit 24.1 is semicircular; vertical connecting plates 6 are respectively provided on the vertical sides of the adjusting cylinder unit 24.1, and vertical perforations are provided on the vertical connecting plates 6 at intervals along the vertical direction; the two adjusting cylinder units 24.1 are spliced and connected and connected by adjusting bolts 24.2 passing through the perforations 7; in this embodiment, nine adjusting bolts 24.2 are provided on each side of the two adjusting cylinder units 24.1; the nine adjusting bolts 24.2 are arranged in a matrix; the annular protrusion 5 is provided by the two adjusting cylinder units 24.1 is composed of a semicircular arc-shaped protrusion on the inner side; the top of the unloading tube 4 is connected to a support plate 8; the support bracket is installed on the support plate 8 at the top of the two brackets 2, and includes a longitudinal beam 9, a main crossbeam 10 and a distribution beam 11; there is a group of longitudinal beams 9, which are placed on the longitudinal corresponding support plates 8 at the top of the two brackets 2, and a longitudinal beam limiting cover 12 is provided on the support plate 8 and on the outer side of the longitudinal beam 9; in this embodiment, a stiffening plate is provided between the support plate 8 and the inclined column 2.1.1; the longitudinal beam limiting cover 12 is connected to the longitudinal beam 9 by a first bolt 13; there are two main crossbeams 10, which are divided into They are arranged on the longitudinal beam limit covers 12 on top of the two brackets 2, and each main crossbeam 10 is detachably connected to the corresponding longitudinal beam limit cover 12 in the transverse direction. There is a group of distribution beams 11, spaced apart in the transverse direction, with each distribution beam 11 placed longitudinally on two main crossbeams 10. Distribution beam limit covers 14 are installed on the outside of the distribution beams 11, corresponding to the main crossbeams 10. The distribution beams 11 and distribution beam limit covers 14 are connected by second bolts 15. A cap beam bottom formwork is laid on top of the distribution beam limit covers 14, and the top of the pier 1 extends above the cap beam bottom formwork to connect with the cap beam to be cast.

[0048] In this embodiment, there are two rows of piers 1, which are respectively arranged on both sides of the passage; the cap beam 16 is cast between the piers 1 on both sides of the passage; the fixed cylinder 3 includes a bottom plate and a side plate, and the bottom plate is covered with an anti-corrosion lining plate; the horizontal section of the side plate is annular and welded to the bottom plate; the edges of the bottom edge extend beyond the side of the side plate, and the bottom plate is connected to the horizontal connecting plate 21; the unloading cylinder 4 is a steel tube concrete structure.

[0049] In this embodiment, the longitudinal beam 9 and the distribution beam 11 are both made of I-beams; the first bolt 13 and the second bolt 15 are both high-strength bolts; the cross-section of the main beam 10 is a double-piece I-beam; of course, in other embodiments, the longitudinal beam 9 and the distribution beam 11 can also be made of H-shaped steel or rectangular cross-section steel; the main beam 10 can also be made of H-shaped steel or rectangular cross-section steel.

[0050] In this embodiment, the bottom end of the bracket unit 2.1 is connected to a flange 18; U-shaped anchor rods 19 are interspersed on the flange 18; the lower part of the U-shaped anchor rod 19 extends into the foundation 20 below the bracket unit 2.1, and the lower end of the U-shaped anchor rod 19 is horizontally bent to form an anchoring section; the upper end of the U-shaped anchor rod 19 is provided with a thread and is anchored to the flange 18 by a nut.

[0051] In this embodiment, the bracket unit 2.1 includes an inclined column 2.1.1 and a transverse connecting beam 2.1.2; the upper ends of the two inclined columns 2.1.1 of the bracket unit 2.1 both extend beyond the top of the transverse connecting beam 2.1.2 of the bracket unit 2.1; a horizontal connecting plate 21 is provided at the upper end of the inclined column 2.1.1; a sealing plate is provided at the bottom of the fixed tube 3, and the fixed tube 3 is connected to the horizontal connecting plate 21 through the sealing plate.

[0052] In this embodiment, the fixed cylinder 3 is made of a steel pipe and is filled with concrete. The height of the fixed cylinder 3 is 30-40 cm, the height of the upper half 3.2 of the fixed cylinder is 15-20 cm, and the outer surface slope angle of the upper half 3.2 of the fixed cylinder is 60-75°.

[0053] In this embodiment, the unloading tube 4 is made of steel pipe, and the inside of the unloading tube 4 is filled with concrete; the height of the unloading tube 4 is 30-40cm, the height of the lower half 4.1 of the unloading tube is 15-20cm, and the outer surface slope angle of the lower half 4.1 of the unloading tube is 60-75°.

[0054] In this embodiment, the outer locking cylinder 24 is made of steel plate, and the inner diameter of the outer locking cylinder 24 is slightly smaller than the outer diameter of the unloading cylinder 4; the height of the annular protrusion 5 is not less than 40 cm; the thickness of the annular protrusion 5 is not less than 1 cm; a horizontal reinforcement plate is arranged between the vertical connecting plate 6 and the outer locking cylinder unit 24.1.

[0055] In this embodiment, the cross-section of the longitudinal beam limit cover 12 is an inverted U-shape, and the two ends of the bottom of the longitudinal beam limit cover 12 are bent horizontally outward to form a first folded edge 22; the first folded edge 22 is supported on the support plate 8 and is detachably connected to the support plate 8; the material of the longitudinal beam limit cover 12 is adapted to the material of the longitudinal beam 9, and the strength of the longitudinal beam limit cover 12 is not lower than the strength of the longitudinal beam 9.

[0056] In this embodiment, the cross-section of the distribution beam limit cover 14 is an inverted U-shape, and the two ends of the bottom of the distribution beam limit cover 14 are bent horizontally outward to form a second folded edge 23; the second folded edge 23 is supported on the main crossbeam 10 and is detachably connected to the main crossbeam 10; the material of the distribution beam limit cover 14 is adapted to the material of the distribution beam 11, and the strength of the distribution beam limit cover 14 is not lower than the strength of the distribution beam 11; the distance between the bottom surface of the top plate of the distribution beam limit cover 14 and the top surface of the distribution beam 11 is not less than 2 cm, and the distance between the bottom surface of the top plate of the longitudinal beam limit cover 12 and the top surface of the longitudinal beam 9 is not less than 2 cm; gaps are reserved between the distribution beam limit cover 14 and the distribution beam 11 and between the longitudinal beam limit cover 12 and the longitudinal beam 9, so that after lowering the height of the unloading device to separate the support system from the cap beam (i.e., unloading the load of the cap beam), it is convenient to pull out the distribution beam 11 and the longitudinal beam 9.

[0057] The method for using this large-span cap beam support system across an existing road includes the following steps.

[0058] Step 1: Punch the steel plate into a flange 18, and cut the steel pipe pile into the designed size to form the inclined column 2.1.1.

[0059] Step 2: Weld the two inclined columns 2.1.1 firmly to the flange 18, and connect the transverse connecting beam 2.1.2 between the upper ends of the two inclined columns 2.1.1 to form the bracket unit 2.1.

[0060] Step three: connect the brackets 2 on both sides of the pier 1 longitudinally.

[0061] Step 4: Install the unloading device on the bracket unit 2.1.

[0062] Step five: placing the longitudinal beam 9 on the support plate 8 , and providing a longitudinal beam limiting cover 12 on the support plate 8 and on the outer side of the longitudinal beam 9 .

[0063] Step six: Use U-shaped bolts to fix the main crossbeam 10 on the longitudinal beam limit cover 12.

[0064] Step seven: Install the distribution beam limiting cover 14 on the main cross beam 10 , and pass the longitudinal beam 9 through the corresponding distribution beam limiting cover 14 in the longitudinal direction.

[0065] Step eight, hoist the large-span cap beam support system as a whole by a crane, and connect the large-span cap beam support system to the foundation 20.

[0066] Step nine, laying the cap beam formwork to be cast on the top of the large-span cap beam support system; the cap beam formwork includes the cap beam bottom formwork and the cap beam side formwork, so that the top of the pier extends above the cap beam bottom formwork and is located in the cap beam to be cast;.

[0067] Step 10: Complete the binding of cap beam reinforcement and pouring of cap beam concrete.

[0068] Step 11: After the strength of the cap beam concrete reaches the requirement and the prestressed steel bars in the cap beam are tensioned, loosen the adjusting bolts 24.2 to allow the unloading tube 4 to drop evenly; the unloading tube 4 drops evenly in multiple times, and the unloading tube 4 drops once each time the adjusting bolts 24.2 are loosened.

[0069] Step 12, then remove the cap beam formwork.

[0070] Step 13: Unscrew the second bolt 15 and pull the distribution beam 11 out of the distribution beam limiting cover 14.

[0071] Step 14: remove the main beam 10.

[0072] Step 15: Unscrew the first bolt 13 and pull the longitudinal beam 9 out of the longitudinal beam limiting cover 12.

[0073] Step 16: Release the longitudinal connection between the brackets 2 on both sides of the pier 1, and hoist the brackets 2 as a whole to the next hole cover beam.

Claims

1. A large-span cap beam support system spanning an existing road, used to support the formwork of a cap beam (16) to be cast on the top of a pier (1), comprising a bracket (2), a discharging device and a support frame; characterized in that: There are two brackets (2), which are arranged on the front and rear sides of each row of piers (1); each bracket (2) includes a bracket unit (2.1) and a connecting beam (2.2); there are two bracket units (2.1), which are respectively arranged on both sides of the passage and corresponding to the piers (1); the bracket unit (2.1) is an inverted isosceles triangle, and the upper ends of the two inclined columns (2.1.1) of the bracket unit (2.1) are respectively located on the left and right sides of the corresponding pier (1); the connecting beam (2.2) connects the two bracket units (2.1) in correspondence; the unloading device is installed on the top of each inclined column (2.1.1), and includes a fixing cylinder (3), an unloading cylinder (4) and an outer locking cylinder (2.1). 4); the fixed cylinder (3) is fixedly connected to the top of the inclined column (2.1.1), and includes a fixed cylinder lower section (3.1) and a fixed cylinder upper section (3.2); the vertical section of the side wall of the fixed cylinder lower section (3.1) is rectangular; the vertical section of the side wall of the fixed cylinder upper section (3.2) is wedge-shaped, and the outer surface of the fixed cylinder upper section (3.2) is an inclined surface that gradually tilts inward from bottom to top; the unloading cylinder (4) is arranged directly above the fixed cylinder (3), and includes a unloading cylinder lower section (4.1) and an unloading cylinder upper section (4.2); the vertical section of the side wall of the unloading cylinder upper section (4.2) is rectangular; the vertical section of the side wall of the unloading cylinder lower section (4.1) is wedge-shaped, and The outer surface of the lower half (4.1) of the unloading tube is an inclined surface that gradually tilts inward from top to bottom; the outer locking tube (24) is connected between the fixed tube (3) and the unloading tube (4), and the upper hoop of the outer locking tube (24) is arranged on the outer surface of the lower half (4.1) of the unloading tube, and the lower hoop of the outer locking tube (24) is arranged on the outer surface of the upper half (3.2) of the fixed tube; the top of the unloading tube (4) exceeds the top of the outer locking tube (24); the bottom of the fixed tube (3) exceeds the bottom of the outer locking tube (24); an annular protrusion (5) is provided on the inner surface of the outer locking tube (24) corresponding to the fixed tube (3) and the unloading tube (4); the inner surface of the annular protrusion (5) is provided The upper portion of the surface is an inclined surface that fits the outer surface of the lower half (4.1) of the unloading cylinder, and the lower portion of the inner surface of the annular protrusion (5) is an inclined surface that adapts to the outer surface of the upper half (3.2) of the fixing cylinder; the outer locking cylinder (24) includes an adjusting cylinder unit (24.1) and an adjusting bolt (24.2); there are two adjusting cylinder units (24.1), and the horizontal section of the adjusting cylinder unit (24.1) is semicircular; vertical connecting plates (6) are respectively provided on the vertical sides of the adjusting cylinder unit (24.1), and through-holes are provided on the vertical connecting plates (6) at intervals along the vertical direction; the two adjusting cylinder units (24.1) are spliced and connected, and are adjusted by the adjusting bolt (24.2) provided in the through-hole (7).2) connection; the top of the unloading cylinder (4) is connected with a support plate (8); the support bracket is installed on the support plate (8) at the top of the two brackets (2), and includes a longitudinal beam (9), a main cross beam (10) and a distribution beam (11); the longitudinal beam (9) has a group, which is placed on the longitudinal corresponding support plates (8) at the top of the two brackets (2), and a longitudinal beam limiting cover (12) is provided on the support plate (8) and located on the outer side of the longitudinal beam (9); the longitudinal beam limiting cover (12) is connected to the longitudinal beam (9) by a first bolt (13); the main cross beam ( There are two main crossbeams (10), which are respectively arranged on the longitudinal beam limit covers (12) at the top of the two brackets (2), and each main crossbeam (10) is detachably connected to the longitudinal beam limit cover (12) corresponding to the longitudinal beam in the transverse direction; there is a group of distribution beams (11), which are arranged at intervals in the transverse direction, and each distribution beam (11) is placed on the two main crossbeams (10) in the longitudinal direction; and a distribution beam limit cover (14) is provided on the outer side of the distribution beam (11) at the position corresponding to the main crossbeam (10); the distribution beam (11) and the distribution beam limit cover (14) are connected by a second bolt (15).

2. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The bottom end of the bracket unit (2.1) is connected to a flange (18); U-shaped anchor rods (19) are arranged on the flange (18) at intervals; the lower part of the U-shaped anchor rod (19) extends into the foundation (20) below the bracket unit (2.1), and the lower end of the U-shaped anchor rod (19) is bent horizontally to form an anchoring section; the upper end of the U-shaped anchor rod (19) is provided with a thread and is anchored to the flange (18) by a nut.

3. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The upper ends of the two inclined columns (2.1.1) of the bracket unit (2.1) both extend beyond the top of the transverse connecting beam (2.1.2) of the bracket unit (2.1); a horizontal connecting plate (21) is provided at the upper end of the inclined column (2.1.1); and the fixing cylinder (3) is connected to the horizontal connecting plate (21).

4. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The fixing cylinder (3) is made of a steel pipe, and the interior of the fixing cylinder (3) is filled with concrete; the height of the fixing cylinder (3) is 30-40 cm, and the height of the upper half (3.2) of the fixing cylinder is 15-20 cm; the outer surface slope angle of the upper half (3.2) of the fixing cylinder is 60-75°.

5. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The unloading tube (4) is made of a steel pipe, and the inside of the unloading tube (4) is filled with concrete; the height of the unloading tube (4) is 30-40 cm, and the height of the lower half (4.1) of the unloading tube is 15-20 cm; the outer surface slope angle of the lower half (4.1) of the unloading tube is 60-75°.

6. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The height of the annular protrusion (5) is not less than 40 cm; the thickness of the annular protrusion (5) is not less than 1 cm.

7. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The cross section of the longitudinal beam limiting cover (12) is in an inverted U-shape, and both ends of the bottom of the longitudinal beam limiting cover (12) are bent outward horizontally to form a first folded edge (22); the first folded edge (22) is supported on the support plate (8) and is detachably connected to the support plate (8); the material of the longitudinal beam limiting cover (12) is compatible with the material of the longitudinal beam (9), and the strength of the longitudinal beam limiting cover (12) is not lower than the strength of the longitudinal beam (9).

8. The large-span cap beam support system across an existing road according to claim 1 is characterized in that: The cross section of the distribution beam limit cover (14) is in an inverted U-shape, and the two ends of the bottom of the distribution beam limit cover (14) are respectively bent outward horizontally to form a second folded edge (23); the second folded edge (23) is supported on the main crossbeam (10) and is detachably connected to the main crossbeam (10); the material of the distribution beam limit cover (14) is compatible with the material of the distribution beam (11), and the strength of the distribution beam limit cover (14) is not lower than the strength of the distribution beam (11).

9. A method for using the large-span cap beam support system across an existing road according to any one of claims 1 to 8, characterized in that: The steps are as follows: Step 1: punch the steel plate to form a flange (18), and cut the steel pipe pile into the designed size to form an inclined column (2.1.1); Step 2: Weld the two inclined columns (2.1.1) and the flange (18) firmly, and connect the transverse connecting beam (2.1.2) between the upper ends of the two inclined columns (2.1.1) to form a bracket unit (2.1); Step 3, connecting the brackets (2) on both sides of the pier (1) with longitudinal connections; Step 4: Install the unloading device on the bracket unit (2.1); Step 5: placing the longitudinal beam (9) on the support plate (8), and providing a longitudinal beam limiting cover (12) on the support plate (8) and located on the outer side of the longitudinal beam (9); Step 6: Use U-shaped bolts to fix the main crossbeam (10) to the longitudinal beam limit cover (12); Step seven, installing the distribution beam limiting cover (14) on the main crossbeam (10), and inserting the longitudinal beam (9) through the corresponding distribution beam limiting cover (14) in the longitudinal direction; Step 8, hoist the large-span cap beam support system as a whole by a crane, and connect the large-span cap beam support system to the foundation (20); Step 9: Lay the cap beam formwork to be cast on the top of the large-span cap beam support system so that the top of the column pier extends above the cap beam bottom formwork and is located in the cap beam to be cast; Step 10: Complete the cap beam reinforcement binding and cap beam concrete pouring; Step 11: After the strength of the cap beam concrete reaches the required level and the prestressed steel bars in the cap beam are tensioned, loosen the adjusting bolts (24.2) to allow the unloading tube (4) to descend evenly; the unloading tube (4) descends at a uniform speed in multiple times, and each time the adjusting bolts (24.2) are loosened, the unloading tube (4) descends once; Step 12, then remove the cap beam formwork; Step 13, unscrewing the second bolt (15), and pulling the distribution beam (11) out of the distribution beam limit cover (14); Step 14, dismantling the main beam (10); Step 15, unscrewing the first bolt (13), and pulling the longitudinal beam (9) out of the longitudinal beam limit cover (12); Step 16: Release the longitudinal connection between the brackets (2) on both sides of the pier (1), and hoist the bracket (2) as a whole to the next hole cover beam.

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