Hydraulic synchronous sliding construction method for large-span steel box girder crossing river channel

Abstract

The application provides a hydraulic synchronous sliding construction method for a large-span steel box girder crossing a river, which comprises the following steps: S1, measurement and lofting, foundation treatment; S2, support system erection; S3, embankment integral type steel support preloading; S4, pier column steel bar bending treatment; S5, sliding system installation; S6, windproof construction shed hoisting; S7, steel box girder hoisting, welding and jacking to the bridge position. The hydraulic synchronous sliding construction system for the large-span steel box girder crossing the river has high support stability, fast construction speed, good steel box girder installation quality, and many construction advantages such as high quality, high efficiency, high benefit and the like, and the technical benefit is remarkable.

Description

Technical Field

[0001] This invention relates to the field of highway engineering technology, and in particular to a hydraulic synchronous sliding construction method for large-span steel box girders crossing rivers. Background Technology

[0002] Against the backdrop of rapid economic and technological development, the construction of viaducts has become increasingly frequent in order to alleviate intercity traffic pressure. However, the foundations for viaduct construction are diverse, and sometimes construction even requires crossing existing river channels. If conventional segmented hoisting is used within the river channel, a large number of temporary pile supports must be installed, which presents challenges in foundation management. Not only is the workload for component assembly and welding enormous, but the project also faces significant safety risks. The difficulty of constructing viaducts across river channels is self-evident, resulting in a longer construction period for the entire project.

[0003] Hydraulic synchronous sliding construction technology can precisely compensate for these shortcomings. Furthermore, steel box girders are lightweight, easy to install, and convenient to transport, leading to their increasingly widespread application in bridge construction. However, existing hydraulic sliding technology faces the following challenges: 1) When piers are located on riverbanks, the space for erecting scaffolding on the riverside is generally limited, and using simple single-sided scaffolding results in insufficient stability of the sliding system; 2) The sliding track conflicts with some piers, and there are even localized broken beam joints, significantly reducing the stability of the sliding track; 3) Welding of steel box girders in open construction areas is severely affected by weather conditions.

[0004] Therefore, there is an urgent need to invent a sliding installation method for large-span steel box girders across river channels that offers high support stability, fast construction speed, good installation quality, and outstanding economic and technical benefits. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic synchronous sliding construction method for large-span steel box girders crossing rivers, which features high support stability, fast construction speed, good installation quality of steel box girders, and outstanding economic and technical benefits.

[0006] To achieve the above objectives, this technical solution provides a hydraulic synchronous sliding construction method for large-span steel box girders spanning a river, comprising the following steps:

[0007] S1: Surveying and setting out, foundation treatment: delineate the construction area, set out the support position, pour independent concrete foundation, excavate the embankment foundation pit on the embankment and tie the steel cage in the embankment foundation pit, install the steel pipe pile connected to the steel cage in the embankment foundation pit, and after the installation is completed, pour the embankment concrete foundation in the embankment foundation pit and then backfill the foundation pit.

[0008] S2: Support system construction: Install the lattice column support and the pier side steel pipe column support on the top of the independent concrete foundation, and install the embankment integral steel support on the top of the steel pipe pile, and the top elevations of the lattice column support, the side steel pipe column support and the embankment integral steel support are the same.

[0009] S3: Pre-stressing of the integral steel support for the embankment: Multiple water-fillable bags are stacked inside and on top of the integral steel support for the embankment. The water-fillable bags are used to pre-stress the integral steel support for the embankment. The water-fillable bags are connected by water injection pipes. The water flow from the river embankment is directly introduced into the water-fillable bags using the water injection pipes and the pumping equipment connected to the water injection pipes. After the pre-stressing is completed, the water is released and the water-fillable bags are recycled.

[0010] S4: Pier Reinforcement Bending Treatment: All piers near the track beams are equipped with clamp-type reinforcement bending and positioning devices on their upper parts. The clamp-type reinforcement bending and positioning device consists of a main clamp, a clamp wall ring, a sliding positioning plate, and a limiting pin. The main clamp and the clamp wall ring are an integral structure and are symmetrically arranged on both sides of the pier and connected by high-strength bolts. The outer surface of the clamp wall ring is provided with vertical grooves, and multiple limiting holes are provided at equal intervals on the vertical grooves. The inner wall of the sliding positioning plate is provided with sliding rods, which are embedded in the vertical grooves. After the reinforcement bending points are located with the assistance of the sliding positioning plate, the reinforcement of the pier is bent uniformly.

[0011] S5. Sliding system installation: Install the distribution beam, track beam and track in sequence from bottom to top on the top of the support system, and install the hydraulic crawler on the track. When the track beam conflicts with the position of the existing pier, cut the track beam and install it across the pier.

[0012] S6. Installation of windproof construction shed: The windproof construction shed is installed above the support system of the initial sliding section. First, the retaining wall columns and distribution beams are anchored. Then, baffles are installed between the retaining wall columns to form a retaining wall. Finally, the shed cover is installed using the foundations of the retaining walls on both sides.

[0013] S7. Steel box girder hoisting, welding and jacking to the bridge position: The steel box girder will be slid in two sections, left and right, one by one. The left section will be hoisted and welded first, and then slid to the bridge position through the guide beam. The right section will be hoisted and welded and slid to the bridge position. After completion, the support system will be dismantled.

[0014] Compared to existing technologies, this invention, through field experimental research and comparison of support systems and construction methods, proposes a hydraulic synchronous sliding construction method for large-span steel box girders spanning river channels. It combines novel components such as integral steel supports, clamp-type rebar bending and positioning devices, and windproof construction sheds. Verified through multiple projects, this method can provide technical reference for steel box girder engineering and offers good economic and technical benefits. Specifically, this technical solution has the following characteristics and beneficial effects:

[0015] (1) A reverse construction technology for temporary pier foundation of lattice column was developed: the foundation pit was excavated at the site of the embankment to set up the embankment concrete foundation, the steel pipe piles were embedded in the embankment concrete foundation and backfilled, and then a temporary support system was set up on the top of the steel pipe piles, which greatly improved the stability of the support of the embankment section.

[0016] (2) A steel pipe column reinforcement technology for crossing piers was developed: steel pipe columns were added on both sides of the pier where there was a positional conflict with the track beam, and a clamp system was set on the upper part of the pier to connect with the steel pipe columns on both sides, which greatly improved the stability of the sliding system.

[0017] (3) A mechanical device for bending the steel bars of the pier column was developed: the steel bars of the pier column are bent at the clamping points by a clamp-type steel bar bending and positioning device to prevent the steel bars from damaging the concrete at the root during the bending process and affecting the quality of the pier column.

[0018] (4) A prefabricated windproof construction shed for steel box girders was developed: it can be quickly assembled using prefabricated components, avoiding delays in the construction period caused by weather affecting the welding and painting of steel box girders. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the prestressed structure of the integral steel support for the embankment in this invention;

[0020] Figure 2 This is a cross-sectional view of the windproof construction shed structure in this invention;

[0021] Figure 3 This is a side view of the windproof construction shed structure in this invention;

[0022] Figure 4 In this invention Figure 3 AA cross-section view;

[0023] Figure 5 This is a schematic diagram of the integral steel support structure in this invention;

[0024] Figure 6 This is a schematic diagram of a general lattice column support structure in this invention;

[0025] Figure 7 This is a schematic diagram of the pier-side steel pipe column support structure in this invention;

[0026] Figure 8 This is a schematic diagram of the track beam spanning the existing pier structure in this invention;

[0027] Figure 9 This is a schematic diagram of the clamp wall ring installation in this invention;

[0028] Figure 10 This is a cross-sectional view of the clamp-type rebar bending and positioning device of the present invention;

[0029] Figure 11 This is a schematic diagram of the position of the limiting pin in this invention;

[0030] Figure 12 This is a schematic diagram of the hydraulic synchronous sliding system for a large-span steel box girder spanning a river channel according to the present invention.

[0031] In the diagram: 1-Water injection pipe; 2-Water-fillable bag; 3-Top end plate; 4-Bottom end plate; 5-Integral steel support for the embankment; 6-Backfill soil; 7-Steel pipe pile; 8-Embankment concrete foundation; 9-Reinforcing cage; 10-Steel box girder; 11-Track; 12-Base; 13-Distribution beam; 14-Central crossbeam; 15-Canopy; 16-Top bolt; 17-Retaining wall column; 18-Track beam; 19-Bottom bolt; 20-Grid column support; 21-Independent concrete foundation; 22-Support baffle; 23-Cross baffle; 24-Steel pipe column support on the pier side; 25-Pier column; 26-Pier column reinforcement; 27-Sliding positioning plate; 28-Limiting pin; 29-Auxiliary clamp; 30-Clamp wall ring; 31-Slide groove; 32-High-strength bolt; 33-Main clamp; 34-Sliding rod; 35-Limiting hole; 36-Guide beam; 37-Embankment. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0033] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0034] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0035] The hydraulic synchronous sliding construction method for large-span steel box girders spanning river channels provided in this plan includes the following steps:

[0036] S1. Surveying and setting out, foundation treatment: Delineate the construction area, set out the support position, pour independent concrete foundation 20, excavate the embankment foundation pit on the embankment 37 and tie the steel cage 9 in the embankment foundation pit, install the steel pipe pile 7 connected to the steel cage 9 in the embankment foundation pit, and after the installation is completed, pour the embankment concrete foundation 8 in the embankment foundation pit and then backfill the foundation pit.

[0037] In this step, such as Figure 1 and Figure 12 As shown, multiple steel pipe piles 7 are vertically embedded in the concrete foundation 8 of the embankment at intervals, and all steel pipe piles 7 are exposed outside the embankment pit. The portion of the steel pipe piles 7 placed inside the embankment pit is filled with backfill soil 6. The bottom end plate 4 of the steel pipe piles 7 is welded to the reinforcing cage 9 inside the concrete foundation 8 of the embankment. In addition, multiple independent concrete foundations 20 are set at intervals on the embankment 37 along with the concrete foundation 8 of the embankment.

[0038] S2. Support system construction: Install the lattice column support 20 and the pier side steel pipe column support 24 on the top of the independent concrete foundation 20, and install the embankment integral steel support 5 on the top of the steel pipe pile 4, and the top elevations of the lattice column support 20, the side steel pipe column support 24 and the embankment integral steel support 5 are the same.

[0039] In this step, such as Figure 1 and Figure 12 As shown, the integral steel support 5 of the embankment is installed on the top end plate 3 of the steel pipe pile 4. The top end plate 3 of each steel pipe pile 4 has the same elevation to ensure that the integral steel support 5 of the embankment can be placed horizontally on the steel pipe pile 4.

[0040] S3. Pre-compression of the integral steel support 5 of the embankment: Multiple water-fillable bags 2 are stacked inside and on top of the integral steel support 5 of the embankment. The water-fillable bags 2 are used to pre-compress the integral steel support 5 of the embankment. The water-fillable bags 2 are connected by water injection pipes 1. The river water flow is directly introduced into the water-fillable bags 2 by water injection pipes 1 and pumping equipment connected to water injection pipes 1. After the pre-compression is completed, water is released and the water-fillable bags 2 are recycled.

[0041] like Figure 1 As shown, the integral steel support 5 for the embankment includes an upper support plate and a lower support plate connected by support plates. The upper and lower support plates are arranged parallel to each other at intervals, and a support plate connects the upper and lower support plates. In some embodiments, the support plate includes a vertical support plate perpendicularly connected to the upper support plate and an inclined support plate obliquely connected to the upper support plate. The two ends of the support plate are respectively connected to the upper and lower support plates. In this case, multiple stacked water-fillable bags 2 are placed on the lower and upper support plates respectively. Specifically, the water-fillable bags 2 in this embodiment are stacked in a triangular shape.

[0042] S4. Reinforcing bar bending treatment of pier columns: A clamp-type reinforcing bar bending and positioning device is installed on the upper part of all pier columns 25 near the track beam. The clamp-type reinforcing bar bending and positioning device consists of a main clamp 33, a clamp wall ring 30, a sliding positioning plate 27, and a limiting pin 28. The main clamp 33 and the clamp wall ring 30 are an integral structure and are symmetrically arranged on both sides of the pier column 25 and connected by high-strength bolts 32. The outer surface of the clamp wall ring 30 is provided with a vertical groove 31, and multiple limiting holes 35 are evenly spaced on the vertical groove 31. The inner wall of the sliding positioning plate 27 is provided with a sliding rod 34, which is embedded in the vertical groove 31. After the bending point of the reinforcing bar is located with the assistance of the sliding positioning plate 27, the reinforcing bar of the pier column 25 is bent uniformly.

[0043] In this step, such as Figure 8 , 9 As shown in Figures 10 and 11, an auxiliary clamp 29 is connected to the side of the main clamp 33. The auxiliary clamp 29 is fitted onto the outer surface of the steel pipe column support 24 on the pier side, and the main clamp 33 is fitted onto the outer surface of the pier column 25. The auxiliary clamp 29 and the steel pipe column support 24 on the pier side, as well as the main clamp 33 and the pier column 25, are connected and fixed by high-strength bolts 32. In some specific embodiments, the main clamp 33 and the auxiliary clamp 29 are located on the same horizontal line perpendicular to the pier column 25.

[0044] The clamp wall ring 30 is located above the main clamp 33 and is fitted onto the outer surface of the pier column 25 and connected by high-strength bolts 32. Multiple vertical grooves 31 are parallel to each other on the surface of the clamp wall ring 30, with the vertical direction of the grooves 31 parallel to the vertical direction of the pier column 25. Multiple limiting holes 35 are spaced apart on the grooves 31, and the sliding rod 34 of the sliding alignment plate 27 is embedded into the limiting hole 35 for fixation. In other words, after adjusting the position of the sliding alignment plate 27 to a specific position, the sliding rod 34 of the sliding alignment plate 27 is inserted into the limiting hole 35 of the groove 31 for fixation. Figure 10 and Figure 11 As shown, the sliding alignment plate 27 has an arc-shaped structure. Two sliding alignment plates 27 are symmetrically fitted on the pier column 25 to achieve sliding. In addition, the clamp wall ring 30 is provided with a limiting pin 28. When the sliding rod 34 of the sliding alignment plate 27 is inserted into the limiting hole 35, the limiting pin 28 is used to fix the sliding alignment plate 27.

[0045] S5. Sliding system installation: Install the distribution beam 13, track beam 18 and track 11 sequentially from bottom to top on the top of the support system, and install the hydraulic crawler on the track 11. When the track beam 18 conflicts with the position of the existing pier 25, cut the track beam 18 and install it across the pier 25.

[0046] Specifically, when installation needs to cross the pier 25, additional steel pipe columns 7 are installed on both sides of the pier 25 for support. The steel pipe columns 7 are connected and reinforced to the pier 25 by main clamps 34 and auxiliary clamps 29. Specifically, the auxiliary clamps 29 are connected to the side of the main clamps 33. The auxiliary clamps 29 are fitted onto the outer surface of the steel pipe columns 7, and the main clamps 33 are fitted onto the outer surface of the pier 25. The auxiliary clamps 29 and the steel pipe column supports 24 on the pier side, as well as the main clamps 33 and the pier 25, are connected and fixed by high-strength bolts 32.

[0047] like Figure 5 , 6 and Figure 7 As shown, the distribution beam 13 is laid flat on top of the lattice column support 20, the pier side steel pipe column support 24, and the integral steel support 5 of the embankment. The track beam 18 is set perpendicular to the distribution beam 13 and placed on the upper surface of the distribution beam 13. A track 11 is laid flat on each track beam 18. Steel box girders 10 are placed on the track 11, and a middle cross beam 14 is set between adjacent steel box girders 10.

[0048] S6. Installation of windproof construction shed: The windproof construction shed is installed above the support system of the initial sliding section. First, the retaining wall column 17 and the distribution beam 13 are anchored. Then, the baffle is installed between the retaining wall columns 17 to form a retaining wall. Finally, the shed cover 15 is installed using the foundation of the retaining walls on both sides.

[0049] In this step, such as Figure 2 , 3 As shown in Figure 4, the windproof construction shed consists of retaining wall columns 17, support baffles 22, cross baffles 23, and a canopy 15. The retaining wall columns 17 are equipped with bases 12, which are anchored to the distribution beams 13 by bottom bolts 19 and are placed on both sides of the steel box beam 10. The top bolts 16 at the top of the retaining wall columns 17 are anchored to the canopy 15, which is placed on top of the steel box beam 10.

[0050] like Figure 3 and Figure 4 As shown, the baffle includes a support baffle 22 and a cross baffle 23. The support baffle 22 is suspended between the retaining wall columns 17, and the cross baffle 23 is between the support baffles 22. The support baffle 22 and the cross baffle 23 together form the retaining wall.

[0051] S7. Steel box girder hoisting, welding and jacking to the bridge position: The steel box girder 10 is slid in two sections, left and right, and then slid to the bridge position through the guide beam 36. The right section is then hoisted, welded and slid to the bridge position. After completion, the support system is dismantled.

[0052] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A hydraulic synchronous sliding construction method for large-span steel box girders spanning a river, characterized in that: include: S1: Surveying and setting out, foundation treatment: delineate the construction area, set out the support position, pour independent concrete foundation, excavate the embankment foundation pit on the embankment and tie the steel cage in the embankment foundation pit, install the steel pipe pile connected to the steel cage in the embankment foundation pit, and after the installation is completed, pour the embankment concrete foundation in the embankment foundation pit and then backfill the foundation pit. S2: Support system construction: Install the lattice column support and the pier side steel pipe column support on the top of the independent concrete foundation, and install the embankment integral steel support on the top of the steel pipe pile, and the top elevations of the lattice column support, the pier side steel pipe column support and the embankment integral steel support are the same. S3: Pre-stressing of the integral steel support structure of the embankment: Multiple water-fillable bags are stacked inside and on top of the integral steel support structure of the embankment. The water-fillable bags are used to pre-stress the integral steel support structure of the embankment. The water-fillable bags are connected by water injection pipes. The water flow from the river embankment is directly introduced into the water-fillable bags using the water injection pipes and pumping equipment connected to the water injection pipes. After the pre-stressing is completed, the water is released and the water-fillable bags are recycled. S4: Pier Reinforcement Bending Treatment: All piers near the track beams are equipped with clamp-type reinforcement bending and positioning devices on their upper parts. These devices consist of a main clamp, a clamp wall ring, a sliding positioning plate, and limiting pins. The main clamp and clamp wall ring are an integrated structure, symmetrically positioned on both sides of the pier and connected by high-strength bolts. The outer surface of the clamp wall ring has vertical grooves with multiple equally spaced limiting holes. The inner wall of the sliding positioning plate has sliding rods that are embedded in the vertical grooves. After the bending points of the reinforcement are located with the assistance of the sliding positioning plate, the reinforcement of the pier is uniformly bent. An auxiliary clamp is connected to the side of the main clamp. The auxiliary clamp is fitted onto the outer surface of the pier-side steel pipe column support, and the main clamp is fitted onto the outer surface of the pier. The auxiliary clamp and the pier-side steel pipe column support, as well as the main clamp and the pier, are fixed together by high-strength bolts. S5. Sliding System Installation: Install the distribution beam, track beam, and track sequentially from bottom to top on the top of the support system, and install hydraulic crawlers on the track. When the track beam conflicts with the position of the existing pier, cut the track beam and install it across the pier. When it is necessary to install across the pier, add steel pipe columns on both sides of the pier for support. The steel pipe columns are connected and reinforced to the pier through main clamps and auxiliary clamps. S6. Installation of windproof construction shed: The windproof construction shed is installed above the support system of the initial sliding section. First, the retaining wall columns and distribution beams are anchored. Then, baffles are installed between the retaining wall columns to form a retaining wall. Finally, the shed cover is installed using the retaining wall columns on both sides. S7. Steel box girder hoisting, welding and jacking to the bridge position: The steel box girder will be slid in two sections, left and right, one by one. The left section will be hoisted and welded first, and then slid to the bridge position through the guide beam. The right section will be hoisted and welded and slid to the bridge position. After completion, the support system will be dismantled.

2. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 1, characterized in that, Multiple steel pipe piles are vertically embedded in the concrete foundation of the embankment at intervals, and all steel pipe piles are exposed outside the embankment pit. The portion of the steel pipe piles placed inside the embankment pit is filled with backfill soil, and the bottom end plate of the steel pipe piles is welded to the reinforcing cage in the concrete foundation of the embankment.

3. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 1, characterized in that, The integral steel support frame for the embankment includes an upper support plate and a lower support plate connected by a support plate. The upper and lower support plates are arranged in parallel with intervals and are connected by a support plate. Multiple stacked water-fillable bags are placed on the lower support plate and the upper support plate respectively.

4. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 1, characterized in that, The sliding alignment plate has an arc-shaped structure. Two sliding alignment plates are symmetrically fitted onto the pier to achieve sliding. After adjusting the position of the sliding alignment plate to a specific position, the sliding rod of the sliding alignment plate is inserted into the limiting hole of the sliding groove to achieve fixation.

5. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 1, characterized in that, The distribution beams are laid flat on top of the lattice column supports, the pier side steel pipe column supports, and the integral steel supports of the embankment. The track beams are set perpendicular to the distribution beams and placed on the upper surface of the distribution beams. Tracks are laid flat on each track beam, and steel box girders are placed on the tracks. A middle cross beam is set between adjacent steel box girders.

6. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 1, characterized in that, The retaining wall consists of support retaining walls and cross retaining walls. Support retaining walls are suspended between the retaining wall columns, and cross retaining walls are placed between the support retaining walls. The support retaining walls and cross retaining walls together form the retaining wall.

7. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 6, characterized in that, The windproof construction shed consists of retaining wall columns, support panels, cross panels, and a canopy. The retaining wall columns are equipped with bases, which are anchored to the distribution beams by bottom bolts and are placed on both sides of the steel box girder. The top bolts of the retaining wall columns are anchored to the canopy, which is placed on top of the steel box girder.

8. The hydraulic synchronous sliding construction method for large-span steel box girders spanning a river as described in claim 1, characterized in that, The integral steel support frame of the embankment is installed on the top end plate of the steel pipe piles, and the top end plate of each steel pipe pile is at the same elevation.

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