Construction structure of water-rich soft soil steel pipe bailey beam support large cantilever prestress cast-in-place bent cap system

Abstract

The utility model discloses a construction structure of a water-rich soft soil steel pipe bailey beam support large cantilever prestress cast-in-place bent cap system, which comprises design and construction of a large cantilever bent cap steel pipe bailey beam support system, and guarantees the quality of a large cantilever bent cap. Manufacturing and installing a cover beam integral jig frame to realize integral processing and hoisting of a cover beam framework; a shaped support is adopted to assist accurate sinking of bent cap steel bars, and accurate binding of the steel bars and protection of a steel bar framework are achieved; setting a template of the cover beam and hoisting; the utility model discloses a prestressed cover beam tensioning hanging type operation platform. The movable spraying intelligent maintenance bent cap operation platform ensures that concrete maintenance spraying is uniform and the concrete quality is ensured, and the construction method has the characteristics that the integrity of the steel reinforcement framework is high, the steel reinforcement binding position is accurate, the concrete maintenance effect is good, the operation platform is movable and the like, and is suitable for construction of a large cantilever bent cap steel pipe bailey beam support system.

Description

Technical Field

[0001] This utility model relates to the construction structure of a prestressed cast-in-place cap beam system in the field of prestressed cast-in-place cap beam construction, specifically involving a large cantilever prestressed cast-in-place cap beam system supported by a steel pipe Bailey beam in water-rich soft soil. Background Technology

[0002] The construction of large-section, ultra-heavy-load frame beams is becoming increasingly common. These beams feature complex structures, high self-weight, and multiple spans. During the installation of the beam reinforcement cage, problems frequently arise, such as cracking of the bottom support blocks or incomplete placement of the blocks, leading to insufficient concrete cover thickness at the bottom of the beam and even exposed reinforcement after concrete pouring. On-site assembly of the reinforcement cage, including the spacing of stirrups, main reinforcement bars, and embedded parts, is difficult to control precisely, resulting in deviations between the final product's stress distribution and the design drawings. On-site binding of the reinforcement cage requires skilled workers, resulting in high labor costs, slow speed, and low efficiency. Traditional concrete curing methods, such as watering with hoses, are inefficient and ineffective for large-span concrete cap beams. Utility Model Content

[0003] The purpose of this utility model is to provide a construction structure for a large cantilever prestressed cast-in-place cap beam system with steel pipe Bailey beam support in water-rich soft soil, which solves the above-mentioned technical problems.

[0004] To achieve the above objectives, this utility model provides a construction structure for a large cantilever prestressed cast-in-place cap beam system with steel pipe Bailey beam support in water-rich soft soil, comprising:

[0005] The support system consists of a support foundation, columns, supporting beams, Bailey bridge load-bearing structure, disc-lock scaffolding, distribution beams, and supporting formwork. The columns have preset specifications, preset connection structures at the bottom, and top support structures at the top. The support system also includes an edge protection structure for the construction platform and a loading device for testing the load-bearing capacity of the support.

[0006] The cap beam frame fabrication and positioning device includes an overall binding jig for the cap beam frame and a movable precision positioning slot. The overall binding jig for the cap beam frame has a pre-set structure for the main beam, support beam, bottom longitudinal beam and stirrup limiter. The movable precision positioning slot includes a pre-set structure for the transverse and longitudinal bottom plate reinforcement positioning slots, bolt fixing plates, movable pulleys and U-shaped support frames.

[0007] Template and hoisting device: including standardized template for the cap beam and hoisting device. The standardized template for the cap beam has preset connection, material and tie structure. The hoisting device has preset balance beam, telescopic block, clamping parts and other auxiliary adjustment structure.

[0008] Tensioning operation platform device: It consists of main beam, frame structure, bottom platform, anchor holes and tensioning operation auxiliary structure. The frame structure has preset connection and reinforcement methods, the bottom platform has preset laying and protection structure, and safety protection net is set around the perimeter.

[0009] Maintenance operation platform device: includes a water tank, a spray device, a movable track structure and a control device. The track structure consists of fixed groove rails and folding groove rails with preset structures and connection methods. The sliding device has preset drive and transmission structures. The spray device has preset arrangement methods. The platform also includes a humidity sensor and automatic control spray function.

[0010] Furthermore, when the support foundation is located on an asphalt pavement, a C25 concrete leveling layer is poured on the asphalt pavement for leveling; when the support foundation is located on a crushed stone backfill layer around the abutment, a 2.0m × 2.0m concrete enlarged foundation is poured on the crushed stone backfill layer.

[0011] Furthermore, the column is composed of standard sections and adjusting sections. The standard sections are connected to each other and to the adjusting sections by flanges. The top support steel plate is circular with a thickness of 10mm and its diameter is 6cm larger than that of the spiral pipe. The edge protection structure of the construction platform adopts a prefabricated protective net railing. The bottom of the railing is a platform steel plate, and a protective net with an angle iron frame is installed or welded on the outer edge of the platform steel plate.

[0012] Furthermore, the main beam of the overall binding frame of the cap beam is made of two 20a channel steels spliced ​​together, with several limiting holes. Steel pipes are inserted into these limiting holes to form stirrups for limiting the movement. Support beams are connected to the main beams and arranged along them, including upper, middle, and bottom support beams. The upper support beam is connected to the top of the main beam and is made of I-beams (10mm). Triangular supports are provided at the overlap with the main beam and fully welded, serving to support the upper main reinforcement of the large cap beam's steel reinforcement frame. The middle support beam is made of 8×8cm square steel pipes, with triangular supports at the overlap with the main beam and fully welded, serving to support the upper main reinforcement of the general cap beam's steel reinforcement frame. The bottom support beam is connected adjacent to the bottom of the main beam and is made of I-beams (10mm). The bottom longitudinal beam is made of I-beams and fully welded to the bottom longitudinal beams. Its function is to support the lower main reinforcement of the cap beam reinforcement skeleton. The stirrups are limited by small steel pipes welded to the main beams and round steel inserted into the limiting holes. They are located between the supporting beams. The bottom longitudinal beams are equipped with bottom longitudinal beam connecting rods. The bottom longitudinal beams are connected to the two ends of the bottom longitudinal beam connecting rods. The main beam is connected to one of the bottom longitudinal beams. The bottom longitudinal beam connecting rods are made of 10 I-beams and fully welded to the two parallel bottom longitudinal beams.

[0013] Furthermore, the movable precision positioning slot includes a transverse bottom plate rebar positioning slot, made of two symmetrical angle steels; a longitudinal bottom plate rebar positioning slot, made of a flat plate with multiple grooves, with bolt fixing plates welded to both sides of the longitudinal bottom plate rebar positioning slot; movable pulleys, fixed to the lower part of the transverse bottom plate rebar positioning slot with bolts; and a U-shaped support frame, including U-shaped rebar and rubber pads, with the rubber pads installed on the lower part of the U-shaped rebar. The rebar of the U-shaped support frame is made from leftover materials generated during on-site rebar construction.

[0014] Furthermore, the standardized formwork for the cap beam includes an outer formwork, a bottom formwork, side formwork, and connecting sections. The side formwork and the bottom formwork are connected by bolts, and the gaps are sealed with rubber gaskets. All joints of the side formwork sections are connected by bolts, and the gaps are sealed with rubber gaskets. Two sets of precision-rolled threaded steel are installed at the bottom and top of the formwork for tie rods. All standardized formwork for the cap beam is made of steel. The steel formwork panel is made of 8mm thick steel plate, and the stiffening plate is 12mm. The horizontal ribs on the outside of the panel are made of two channel steels, and the vertical ribs are made of double-channel steel with a maximum spacing of 90-100cm. The bolted surfaces of the formwork are bolted together, and all joints of the formwork sections are bolted together. The gaps are sealed with rubber gaskets.

[0015] The lifting device includes a balance beam and a lifting platform. The balance beam is rectangular, and telescopic blocks are slidably connected to both ends of the balance beam. The telescopic blocks slide relative to each other along the length of the balance beam. A telescopic groove is opened through the balance beam for the telescopic blocks to slide. The telescopic blocks fit against the inner wall of the telescopic groove. A clamping device is provided at the end of the telescopic block away from the balance beam. The clamping device is a clamp that can clamp the steel bars located on the steel cage. The lifting device also includes a lifting plate with a hollow center and a hook. The lifting device also includes a flip cover, a fixing block, and an oil injection hole. The flip cover is installed on the fixing block, and an adjusting screw is installed under the flip cover to adjust the stroke of the telescopic blocks.

[0016] Furthermore, the frame structure composed of crossbeams and channel steel of the prestressed cap beam tensioning and hanging operation platform is welded. The crossbeam system is welded to the main beam using triangular diagonal braces, and stiffening plates are used to reinforce the joints. The crossbeams and platform frame structure are connected by crossbeam connecting rods. A steel pipe is installed above the crossbeams to facilitate the suspension of jacks during tensioning operations. The bottom platform skeleton is formed by welding channel steel, and square timber and templates are laid on the platform skeleton. A bottom platform kickboard is installed above the bottom platform, and a safety net is installed around the entire bottom platform. After the frame structure is assembled, the crossbeams are locked and anchored by inserting expansion bolts through the anchoring holes. The wire rope passes through the pre-drilled holes of the annular wire rope at the end of the main beam and wraps around the cross section of the cap beam to form a clamp. The end of the annular wire rope is connected to a hand-operated hoist, and the main beam and cap beam are fixed by tightening the hand-operated hoist.

[0017] Furthermore, the movable spray intelligent curing cap beam operating platform has a pair of fixed rails spaced apart from each other, which are set along the longitudinal length of the cap beam concrete. One end of each fixed rail is hinged to a folding rail that is horizontally connected to it and can be folded upward. Each fixed rail has a support leg on the lower side of the hinged end that can be placed on the cap beam concrete. A water tank is set between the pair of fixed rails. A pair of sliding devices are set opposite each other on the pair of fixed rails. A spraying device is set below each sliding device. The pair of sliding devices drive the spraying device to reciprocate along the pair of fixed rails and the pair of folding rails, respectively, so that the spraying device sprays the cap beam concrete.

[0018] The sliding device includes a rack disposed on the outer side of a pair of fixed rails and a folded rail. Each fixed rail has a fixed plate seat at a distance from its lower end. The outer lateral end of each fixed plate seat extends outward from the end face of the rack on the same side. A first reducer is disposed on the outer lateral end plate of each fixed plate seat. Drive gears that mesh with the rack on the same side are disposed on both sides of the first reducer. Each drive gear is connected to a coaxial drive shaft. The end of each drive shaft that extends downward from the fixed plate seat is connected to a coaxial drive sprocket. The first reducer is meshed with the drive sprocket through the drive sprocket. A roller mechanism that slides along its axial direction is embedded in the fixed rail or folded rail. A fixed hanger rod that extends outward from the fixed rail or folded rail is disposed on the roller mechanism. The end of the fixed hanger rod that extends outward is connected to the inner lateral end plate of the fixed plate seat. A spraying device is connected to the lower side of the pair of fixed plate seats.

[0019] The fixed rails and the folded rails have the same structure. The cross-section of the fixed rails is a slotted structure with a groove at the bottom. The groove runs through the longitudinal direction of the fixed rails. The ends of the fixed rails and the folded rails are hinged and folded to facilitate the movement of the curing device between adjacent cap beam concrete. When moving, the folded rails fold along the fixed rails to reduce the length of the intelligent curing device before moving. After the movement is completed, the folded rails are rotated open and connected to the fixed rails as one unit. The fixed rails, the folded rails and the folded rails are longitudinally supported on the cap beam concrete by four legs.

[0020] Furthermore, the spraying device includes a spraying water pipe connected to the lower end of a pair of fixed plate seats, and a spray nozzle is provided on the spraying water pipe. The spraying water pipe is arranged in sequence around the lower end of the two fixed plate seats to cover the transverse surface of the cap beam concrete. The movable spraying intelligent curing cap beam operation platform also includes a humidity sensor, which is connected to the intelligent control box.

[0021] Furthermore, when using the mobile spray intelligent curing cap beam operating platform device, the entire device is hoisted and placed on top of the bridge cap beam concrete using lifting rings. The second reducer is then activated to rotate and open the folding groove rail, aligning it with the fixed groove rail, so that the outriggers are firmly supported on the cap beam concrete, and the water inlet pipe of the water tank is connected.

[0022] The advantages of this utility model compared to the prior art are as follows:

[0023] 1) The construction technology of steel pipe Bailey beam support for large cantilever cap beam has the characteristics of convenient splicing and easy connection, which improves the efficiency of Bailey beam support erection and increases the material turnover rate on the construction site.

[0024] 2) The integrated girder frame technology enables the overall processing and hoisting of the girder frame, improving the integrity of the girder frame and optimizing the hoisting process.

[0025] 3) The standardized support technology for precise placement of reinforcing bars in cap beams enables precise binding of reinforcing bars and protection of the reinforcing bar skeleton. The reinforcing bar positioning slots can move laterally, reducing the amount of steel plates used for the slots.

[0026] 4) The counterweight guide tube of this utility model is based on the principle of increasing its own weight and reducing buoyancy when immersed in water. It can be stably embedded in the borehole. By avoiding the backflow of silt, gravel and other debris that block the borehole, the quality of the borehole is guaranteed. At the same time, it can also be used as a guide tube for loading and backfilling, which can effectively improve the loading efficiency and quality.

[0027] 5) A mobile intelligent spray curing platform for the cap beam ensures uniform spraying during concrete curing and improves concrete quality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the main view of the steel pipe Bailey beam support system.

[0029] Figure 2 This is a schematic diagram of the main view of the integrated binding frame for the cap beam.

[0030] Figure 3 This is a side view schematic diagram of the rebar binding precision positioning slot.

[0031] Figure 4 This is a front view schematic diagram of the U-shaped support frame.

[0032] Figure 5 This is a schematic side view of the standardized template for the cap beam.

[0033] Figure 6 This is a schematic diagram of the main view of the standardized template for the cap beam.

[0034] Figure 7 This is a schematic diagram of the steel cage lifting and stabilizing device.

[0035] Figure 8 This is a schematic diagram of a prestressed cap beam tensioning and suspension operation platform.

[0036] Figure 9 This is a schematic diagram of the main structure of the intelligent curing device for bridge cap beam concrete.

[0037] In the diagram: 1-I-beam; 2-Column; 3-I-beam supporting beam; 4-Bailey bridge load-bearing structure; 5-Disc-lock scaffold; 6-Steel pipe column; 7-Scaffold foundation; 8-Distribution beam; 9-Support formwork; 10-Bottom flange; 11-High-strength bolt; 12-Adjusting section; 13-Top support steel plate; 14-Platform steel plate; 15-First main beam; 16-Support beam; 17-Diagonal brace; 18-Stirrup limiter; 19-Upper support beam; 20-Middle support beam; 21-Bottom support beam; 22-Bottom longitudinal beam connecting rod; 23-Transverse bottom plate reinforcement positioning slot; 24-Vertical bottom plate reinforcement positioning slot; 25-Bolt fixing plate; 26-Movable pulley; 27-U-shaped support frame; 28-Rubber pad; 29-U-shaped reinforcement; 30-Bottom formwork; 31-Side formwork; 32-Connecting section; 33-Balance beam; 331-Telescopic block; 332-Oil injection hole; 34-Hanging platform; 341-Hanging hook; 35-Telescopic groove; 351-Flip cover; 352-Fixing block; 36-Clamp; 37-Second main beam; 38-Frame structure; 39-Bottom platform; 40-Anchor hole; 41-Stiffening plate; 42-Steel pipe; 43-Square timber; 44-Kickboard; 45-Safety net; 46-Fixing plate seat; 47-First reducer; 48-Drive gear; 49-Transmission shaft; 50-Drive sprocket; 51-Fixing rod; 52-Sprayer head; 53-Lifting ring; 54-Second reducer; 55-Intelligent control box; 56-Water pump; 57-Water tank; 58-Fixing rail; 59-Folding rail; 60-Outrigger; 61-Rack; 62-Bottom longitudinal beam; 63-Outer mold. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0039] Those skilled in the art should understand that, in the disclosure of this utility model, 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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a preset orientation, or be constructed and operated in a preset orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0040] 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.

[0041] This utility model provides a construction method for a large cantilever prestressed cast-in-place cap beam system with steel pipe Bailey beam support in water-rich soft soil, such as... Figure 1-9 As shown, the construction method includes the following steps:

[0042] Step 1: Design and construction of the steel pipe Bailey beam support system for the large cantilever cap beam:

[0043] The girder support system includes support foundation 7. 1. 500 mm x 8 mm steel pipe columns; 2. Double-jointed I40a I-beam supporting beams; 3. Standard 321 Bailey bridge load-bearing structure on the beams; 4. Disc buckle brackets; 5. I20a I-beam distribution beams; 8. I10 I-beam supporting formwork; 9.

[0044] The support structure consists of six sets of steel pipe columns 2, with a horizontal spacing of 6.0 m and a longitudinal spacing of 3.3 m. Each steel pipe column 2 is a 500 mm × 8 mm circular pipe structure. Double-layered I40a I-beams are installed above the steel pipes as supporting beams 3, and four sets of standard 321 Bailey bridge frames 4 are arranged on the beams as the main load-bearing structure. Disc-lock scaffolding 5 is installed above the Bailey bridge frames to allow for height adjustment to meet the requirements of different pier heights. The bottom of the disc-lock scaffolding 5 uses I20a I-beams as distribution beams 8, and the top is supported by I10 I-beams for formwork 9.

[0045] During the scaffolding construction, a C30 reinforced concrete scaffolding foundation 7 with dimensions of 1.2m × 1.5m × 0.7m (length × width × height) is used. When the scaffolding foundation 7 is placed on the asphalt pavement, a C25 concrete leveling layer is poured on the asphalt pavement to level the concrete precast block (scaffolding foundation 7) foundation. When the precast block is located on the crushed stone backfill layer around the abutment, a concrete enlarged foundation is poured on the crushed stone backfill layer, with the enlarged foundation having dimensions of 2.0m × 2.0m.

[0046] Install steel pipe columns 6, with the bottom flange 10 of the steel pipe column 6 mating with high-strength bolts 11 on the precast concrete block steel plate. The steel pipe column 6 consists of standard sections and adjusting sections 12. Standard sections are connected to each other and to adjusting sections 12 using flanges. After the standard sections are installed, the adjusting sections 12 are installed according to the calculated steel pipe height.

[0047] A top support steel plate 13 is welded to the top of the spiral tube. The top support steel plate 13 is circular, 10 mm thick, and its diameter is 6 cm larger than that of the spiral tube. An I-beam crossbeam is placed on the top support steel plate 13.

[0048] After the installation of the button plate support 5, install the edge protection structure of the construction platform. An assembled protective net guardrail is adopted. The bottom of the guardrail is the platform steel plate 14, and a protective net piece with an angle iron frame is installed or welded on the outer edge of the platform steel plate 14.

[0049] The bearing capacity test of the support should be loaded at 1.1 times the self-weight of the bent cap structure and the loads such as the formwork. The formula is "preloading load = (concrete self-weight + steel bar weight + steel strand weight + formwork weight + construction load) x 1.1" to ensure that the bearing capacity meets the requirements of the "Technical Specification for Preloading of Steel Pipe满堂支架 (JGJ / T 194 - 2009)". The preloading of the support should ensure that the tarpaulin, thick pattern steel plate, etc. are ready, and the I-beams should be arranged along the transverse bridge at a fixed spacing, and the spacing should be flexibly adjusted according to the size of the preloading concrete blocks. Before preloading, attention should be paid to whether the support part is stable, ensure that the preloading weights at each point are symmetrical, and make records. During the preloading process, the loading should be carried out in grades of 60%, 80%, and 100% of the total preloading load value, and observation records should be made. The transverse loading and longitudinal loading should be carried out according to the requirements, with a 12-hour interval. When the average settlement of each monitoring point in 24 consecutive hours is less than 1 mm, it should be determined that the support foundation and the support preloading are qualified. When the average settlement of each monitoring point in 72 consecutive hours is less than 5 mm, it should also be determined that the support foundation and the support preloading are qualified.

[0050] Step 2: Fabrication and installation of the integral bent cap formwork support:

[0051] The integral binding formwork support for the bent cap skeleton includes the first main beam 15, the supporting beam 16, the bottom longitudinal beam 62, and the stirrup limit 18; a single first main beam 15 is spliced by two 20a channel steels to ensure the strength and stiffness of the main beam 1; the first main beam 15 is provided with a number of limit holes, and steel pipes are inserted into the limit holes, and the steel pipes and the limit holes cooperate to form the stirrup limit; further, the stirrup limit 18 is formed by welding small steel pipes to the first main beam 15, and round steel is inserted into the limit holes to form the stirrup limit 18, and its function is to position the bent cap stirrups and ensure the linear shape and accuracy of the stirrups.

[0052] The supporting beam 16 is connected to the first main beam 15 and arranged along the supporting beam 16. The stirrup limiting 18 is connected to the first main beam 15 and is located between the supporting beams 16. Further, the supporting beam 16 includes an upper supporting beam 19, a middle supporting beam 20, and a bottom supporting beam 21. The bottom of the first main beam 15 is connected to the bottom longitudinal beam 62, the upper supporting beam 19 is connected to the top of the first main beam 15, the bottom supporting beam 21 is connected adjacent to the bottom of the first main beam 15, and the middle supporting beam 20 is located between the upper supporting beam 19 and the bottom supporting beam 21. Support frames 17 are welded to the connections of both the upper supporting beam 19 and the middle supporting beam 20 to the first main beam 15 to form a triangular support. The upper support beam 19 is made of I-beam 10. The upper support beam 19 and the first main beam 15 are connected by a triangular support and fully welded. The function of the upper support beam 19 is to support the upper main reinforcement of the main beam of the cap beam. The middle support beam 20 is made of 8×8cm square steel pipe. The middle support beam 20 and the first main beam 15 are connected by a triangular support and fully welded. The function of the middle support beam 20 is to support the upper main reinforcement of the main beam of the cap beam. The bottom support beam 21 is made of I-beam 10. The bottom support beam 21 is fully welded to the bottom longitudinal beam 62. The function of the bottom support beam 21 is to support the lower main reinforcement of the main beam of the cap beam.

[0053] The bottom longitudinal beam 62 is equipped with a bottom longitudinal beam connecting rod 22. The bottom longitudinal beam 62 is connected to both ends of the bottom longitudinal beam connecting rod 22, and the first main beam 15 is connected to one of the bottom longitudinal beams 62. The bottom longitudinal beam connecting rod 22 is made of I-beam 10 and is fully welded to the two parallel bottom longitudinal beams 62. The bottom longitudinal beam connecting rod 22 serves to connect the two bottom longitudinal beams 62, so that the entire cap beam frame is bound together to form a whole, thereby improving the overall stability of the frame.

[0054] Step 3: Use standardized supports to assist in the precise placement of the cap beam reinforcement:

[0055] The movable precision positioning slot includes a transverse bottom plate reinforcement positioning slot 23, a longitudinal bottom plate reinforcement positioning slot 24, a bolt fixing plate 25, a movable pulley 26, and a U-shaped support frame 27.

[0056] The longitudinal bottom plate reinforcement positioning slot 24 is made of a flat plate with multiple grooves. The transverse bottom plate reinforcement positioning slot 23 is made of two symmetrical angle steels. Bolt fixing plates are welded to both sides of the longitudinal bottom plate reinforcement positioning slot 24. The movable pulley 26 is fixed to the lower part of the transverse bottom plate reinforcement positioning slot 23 by bolts.

[0057] The U-shaped support frame 27 includes U-shaped reinforcing bars 29 and rubber gaskets 28. The rubber gaskets 28 are installed at the bottom of the U-shaped reinforcing bars 29. The height of the U-shaped frame is calculated according to the construction drawings, using the following formula: Reinforcing bar height of U-shaped support frame 27 = Slab thickness - Beam reinforcing bar cover thickness - Beam stirrup diameter - Diameter of the first row of longitudinal reinforcing bars on the beam surface - Rubber gasket thickness. The reinforcing bars of the U-shaped support frame 27 are fabricated from leftover materials generated during on-site reinforcing bar construction. The fabrication of the vertical reinforcing bars of the U-shaped support frame 27 should strictly adhere to the calculated data to ensure sufficient cover for the bottom reinforcing bars of the beam, while also meeting the design requirements for the cover thickness of the beam and slab reinforcing bars. During the cutting process, any reinforcing bars found to be split, shortened, or severely bent must be removed.

[0058] After the reinforcing steel skeleton of the cap beam is fabricated, it is transferred to the cap beam skeleton binding area on site for binding. A self-made cap beam skeleton binding platform is used for binding the reinforcing steel skeleton, which improves binding efficiency and makes steel reinforcement installation quick and convenient. When using a jig, the skeleton pieces are simply hung on the cantilever frame and installed in place using special slots. Horizontal and longitudinal reinforcement also have special slots, ensuring precision in the overall binding of the cap beam reinforcement. During the binding of the cap beam skeleton reinforcement in the later stage, the top stirrups are spot-welded to the skeleton piece reinforcement using CO2 gas shielded welding, while the side and bottom stirrups are fixed using wire binding. After the reinforcement binding is completed, before the beam is lowered, a buffer wooden block should be placed near the U-shaped support frame 27, perpendicular to the estimated direction of the beam reinforcement, above the beam opening formwork. The height should be slightly higher than the height of the vertical reinforcement of the U-shaped support frame 27. This prevents deformation of the U-shaped support frame 27 due to worker error during beam lowering. After the beam is lowered, the entire beam is placed on the buffer wooden block to facilitate the placement of the U-shaped support frame 27. Before fixing the U-shaped support frame 27, select a suitable rubber pad size and securely fit it onto the opening of the U-shaped support frame 27. The height of the buffer strip should be slightly higher than the height of the U-shaped support frame 27. After passing the U-shaped support frame 27 under the upper longitudinal reinforcement of the beam, its opening should be vertically downward. The intersection of the upper longitudinal reinforcement of the upper beam should be secured by binding. After fixing the U-shaped support frame 27, remove the buffer strip.

[0059] Step 4: Standardized formwork and hoisting of the cap beam:

[0060] The standardized formwork for the cap beam includes an outer formwork 63, a bottom formwork 30, side formwork 31, and connecting sections 32. The side formwork 31 is bolted to the bottom formwork 30, with rubber gaskets used to seal any gaps. All joints of the side formwork 31 are bolted together, with rubber gaskets used to seal any gaps. Two sets of precision-rolled threaded steel bars are installed at the bottom and top of the formwork for tie rods.

[0061] All standardized formwork for the cap beams uses steel molds. The outer formwork (63mm) does not have tie rods penetrating the cap beam concrete. The steel formwork panels use 8mm thick steel plates and 12mm thick reinforcing ribs. The outer horizontal ribs of the panels use two-channel steel, and the vertical ribs use double-channel steel, with a maximum spacing of 90-100cm. All formwork joints are bolted, and gaps are sealed with rubber pads. The bottom of the formwork is bolted, and two sets of precision-rolled threaded steel are installed at the bottom and top for tie rods.

[0062] The lifting device includes a balance beam 33 and a lifting platform 34. The balance beam 33 is rectangular, and telescopic blocks 331 are slidably connected to both ends of the balance beam 33. The telescopic blocks 331 slide relative to each other along the length of the balance beam 33. A telescopic groove 35 is provided through the balance beam 33 for the telescopic blocks 331 to slide. The telescopic blocks 331 fit against the inner wall of the telescopic groove 35. A clamping element is provided at the end of the telescopic block 331 away from the balance beam 33. In this embodiment, the clamping element is a clamp 36, which can clamp the reinforcing bars located on the reinforcing cage. Before clamping the reinforcing cage, the distance between the telescopic blocks 331 at both ends of the balance beam 33 and the balance beam 33 is adjusted. The lifting device also includes a hook 341, a flip cover 351, a fixing block 352, and an oil injection hole 332. The flip cover is installed on the fixing block 352, and an adjusting screw is installed under the flip cover to adjust the stroke of the telescopic blocks.

[0063] Step 5: Tensioning the prestressed cap beam using a suspended operating platform:

[0064] The prestressed cap beam tensioning and hanging operation platform consists of a second main beam 37, a frame structure 38, a bottom platform 39, and anchoring holes 40.

[0065] The frame structure 38, composed of crossbeams and channel steel, is welded together. The crossbeam system is welded to the second main beam 37 using triangular diagonal braces. Stiffening plates 41 are used to reinforce the joint. The crossbeams and platform frame structure 38 are connected by crossbeam connecting rods. A steel pipe 42 is installed above the crossbeams to facilitate the suspension of jacks during tensioning operations. The bottom platform skeleton is formed by welding channel steel. Square timber 43 and templates are laid on the platform skeleton, and a bottom platform kick plate 44 is installed above the bottom platform 39. A safety net 45 is installed around the entire bottom platform 39. After the frame structure 38 is assembled, the crossbeams are locked and anchored by inserting expansion bolts through the anchoring holes 40. The wire rope passes through the pre-drilled hole at the end of the second main beam 37 and wraps around the cross section of the cap beam to form a clamp. The end of the wire rope is connected to a hand-operated hoist. The main beam and cap beam are fixed by tightening the hand-operated hoist. After the entire frame platform and the cast-in-place cap beam are anchored, the hoisting equipment is used for tensioning operations.

[0066] Among them, the bottom formwork 30 of the cap beam adopts a steel formwork composed of a straight middle section and two cantilevered arm sections. The transverse and longitudinal axes of the cap beam are laid out. The edge line of the cap beam is determined according to the laid-out center line. The elevation of the bottom formwork is adjusted so that the elevation and slope of the bottom formwork are consistent with the design. Rubber strips are installed on the front side of the formwork joints. Before the bottom formwork is installed, the top surface of the pier column is roughened.

[0067] Step Six: Mobile Spray Intelligent Curing Platform for Cover Beams:

[0068] The mobile intelligent spray curing cap beam operating platform includes: a water tank 57, on which a spraying device is connected; a pair of fixed rails 58 spaced apart along the longitudinal length of the cap beam concrete; one end of each fixed rail 58 is hinged to a folding rail 59 that is horizontally connected to it and can be folded upwards; each fixed rail 58 has a support leg 60 on its lower side at the hinged end, which can be placed on the cap beam concrete; the support leg 60 can support the ends of the fixed rail 58 and the folding rail 59 to be in a horizontal state; the water tank 57 is placed between the pair of fixed rails 58; a pair of sliding devices are arranged opposite each other on the pair of fixed rails 58; a spraying device is arranged below each sliding device; the pair of sliding devices drive the spraying device to reciprocate along the pair of fixed rails 58 and the pair of folding rails 59, thereby spraying the cap beam concrete.

[0069] A pair of fixed track rails 58 and a pair of folded track rails 33 have the same structure. The cross-section of the fixed track rail 58 is an opening-shaped structure with a groove at the bottom, and the groove runs through the longitudinal direction of the fixed track rail 58. The ends of the pair of fixed track rails 58 and the pair of folded track rails 59 are hinged and folded to facilitate the movement of the curing device between adjacent cap beam concrete. During movement, the folded track rail 59 folds along the fixed track rail 58 to reduce the length of the intelligent curing device before moving. After the movement is completed, the folded track rail 59 rotates open and connects with the fixed track rail 58 as one unit. The fixed track rail 58 and the folded track rail 59 are longitudinally supported on the cap beam concrete by four legs 60. The support length of the four legs 60 allows the spraying device, sliding device, etc., to detach from the upper surface of the cap beam concrete.

[0070] The sliding device includes racks 61 disposed on the outer sides of a pair of fixed rails 58 and folding rails 59. Each fixed rail 58 has a fixed plate seat 46 spaced apart at its lower end. The outer lateral end of each fixed plate seat 46 extends beyond the end face of the rack 61 on the same side. A first reducer 47 is disposed on the outer lateral end plate surface of each fixed plate seat 46. Drive gears 48 meshing with the rack 61 on both sides of the first reducer 47 are respectively disposed on both sides. Each drive gear 48 is connected to a coaxial drive shaft 49. Each drive shaft 49 extends downward beyond the end of the fixed plate seat 46 and connects to… A transmission sprocket with coaxial transmission is provided. The first reducer 47 is meshed with the transmission sprocket through the drive sprocket 50. A roller mechanism that slides along its axial direction is embedded in the fixed groove rail 58 or the folded groove rail 59. A fixed hanger 51 extending out of the fixed groove rail 58 or the folded groove rail 59 is provided on the roller mechanism. The end of the fixed hanger 51 is connected to the transverse inner end plate surface of the fixed plate seat 46. A spraying device is connected to the lower side of a pair of fixed plate seats 46. The first reducer 47 drives a pair of drive gears 48 on both sides to move along the rack 61, thereby driving the fixed plate seat 46 to move longitudinally.

[0071] The spraying device includes a spray pipe connected to the lower end of a pair of fixed plate seats 46, with nozzles 52 installed on the spray pipe, and the spray pipe is connected to a water tank 57. The spray pipe is arranged sequentially around the lower end of the two fixed plate seats 46 to cover the transverse surface of the cap beam concrete. During spraying, the pair of spraying devices move back and forth along the longitudinal ends of the cap beam concrete to spray. The spraying device at each end moves from the middle position of a pair of fixed rails 58 to the ends of the folded rails 59 on both sides to achieve the spraying operation on the upper part of the entire cap beam concrete.

[0072] When using the mobile intelligent spray curing cap beam operating platform, the entire device is hoisted and placed on top of the bridge cap beam concrete using the lifting ring 53. The second reducer 54 is started to rotate and open the folded track 59 to align with the fixed track 58, so that the support legs 60 are firmly supported on the cap beam concrete. The water inlet pipe of the water tank 57 is connected. The curing time, on / off time and number of curing times of the cap beam concrete are set on the intelligent control box 55. When the set time is reached, the water pump 56 will be automatically started to spray. At the same time, the first reducer 47 is started to make the spraying device move along the fixed track 58 and the folded track 59 to carry out timed curing operations on the cap beam concrete.

[0073] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A construction structure for a large cantilever prestressed cast-in-place cap beam system using steel pipe Bailey beam supports in water-rich soft soil, characterized in that... include: The support system consists of a support foundation (7), columns (2), supporting beams (3), Bailey bridge load-bearing structure (4), disc buckle support (5), distribution beams (8) and support templates (9). The steel pipe columns (2) have preset specifications, the bottom of the columns (2) has a preset connection structure, and the top is equipped with a top support structure. The support system also includes a construction platform edge protection structure and a loading device for the support bearing capacity test. The girder frame fabrication and positioning device includes a girder frame binding jig and a movable precision positioning slot. The girder frame binding jig has a first main beam (15), a support beam (16), a bottom longitudinal beam (62), and a stirrup limiter (18) with a preset structure. The movable precision positioning slot includes a transverse bottom plate reinforcement positioning slot (23) and a longitudinal bottom plate reinforcement positioning slot (24) with a preset structure, a bolt fixing plate (25), and a movable pulley (26). Template and hoisting device: including standardized template for cap beam and hoisting device. The standardized template for cap beam has preset connection, material and tie structure. The hoisting device has preset balance beam (33), telescopic block (331), clamping parts and auxiliary adjustment structure. Tensioning operation platform device: It consists of a second main beam (37), a frame structure (38), a bottom platform (39), anchor holes (40) and tensioning operation auxiliary structure. The frame structure (38) has a preset connection and reinforcement method, the bottom platform (39) is equipped with a preset laying and protection structure, and a safety net (45) is set around it. Maintenance operation platform device: includes water tank (57), spray device, movable track structure and control device. The track structure consists of fixed groove rail (58) and folding groove rail (59) with preset structure and connection method. The sliding device has preset drive and transmission structure. The spray device has preset arrangement method. The platform also includes humidity sensor and automatic control spray function.

2. The construction structure of the large cantilever prestressed cast-in-place cap beam system for water-rich soft soil steel pipe Bailey beam support according to claim 1, characterized in that: The support foundation (7) has different treatment methods in different locations. When the support foundation (7) is located on the asphalt pavement, a C25 concrete leveling layer is poured on the asphalt pavement for leveling. When the support foundation (7) is located on the crushed stone backfill layer around the abutment, a concrete enlarged foundation with a size of 2.0m×2.0m is poured on the crushed stone backfill layer.

3. The construction structure of the large cantilever prestressed cast-in-place cap beam system for steel pipe Bailey beam support in water-rich soft soil as described in claim 1, characterized in that: The first main beam (15) of the overall binding frame of the cap beam is made of two 20a channel steels spliced ​​together, and has several limiting holes. Steel pipes are inserted into the limiting holes to form stirrup limiting (18). The support beam (16) is connected to the first main beam (15) and arranged along the support beam (16), including the upper support beam (19), the middle support beam (20) and the bottom support beam (21). The upper support beam (19) is connected to the top of the first main beam (15) and is made of I-beam 10. Triangular supports are provided at the overlap with the first main beam (15) and fully welded. Its function is to support the upper main reinforcement of the large cap beam steel skeleton. The middle support beam (20) is made of 8×8cm square steel pipe. Triangular supports are provided at the overlap with the first main beam (15) and fully welded. The function is to support the upper main reinforcement of the general cap beam reinforcement skeleton; the bottom support beam (21) is connected to the bottom of the first main beam (15) and is made of I-beam 10. It is fully welded to the bottom longitudinal beam (62) and is used to support the lower main reinforcement of the cap beam reinforcement skeleton; the stirrup limiter (18) is made of small steel pipe and welded to the first main beam (15). It is composed of round steel inserted into the limit hole and is located between the support beams (16); the bottom longitudinal beam (62) is equipped with bottom longitudinal beam connecting rod (22). The bottom longitudinal beam (62) is connected to the two ends of the bottom longitudinal beam connecting rod (22). The first main beam (15) is connected to one of the bottom longitudinal beams (62). The bottom longitudinal beam connecting rod (22) is made of I-beam 10 and is fully welded to the two parallel bottom longitudinal beams (62).

4. The construction structure of the large cantilever prestressed cast-in-place cap beam system for water-rich soft soil steel pipe Bailey beam support according to claim 3, characterized in that: The movable precision positioning slot includes a transverse bottom plate reinforcement positioning slot (23), made of two symmetrical angle steels; a longitudinal bottom plate reinforcement positioning slot (24), made of a flat plate with multiple grooves, with bolt fixing plates (25) welded on both sides of the longitudinal bottom plate reinforcement positioning slot (24); a movable pulley (26), which is fixed to the lower part of the transverse bottom plate reinforcement positioning slot (23) with bolts; and a U-shaped support frame (27), including a U-shaped reinforcement (29) and a rubber pad (28), with the rubber pad (28) installed on the lower part of the U-shaped reinforcement (29), and the reinforcement of the U-shaped support frame (27) is made from the leftover materials generated during the construction site.

5. The construction structure of the large cantilever prestressed cast-in-place cap beam system for steel pipe Bailey beam support in water-rich soft soil according to claim 1, characterized in that: The standardized formwork for the cap beam includes an outer formwork (63), a bottom formwork (30), a side formwork (31), and a connecting section (32). The side formwork (31) and the bottom formwork (30) are connected by bolts. All joints of the formwork segments of the side formwork (31) are connected by bolts. Two sets of finely rolled threaded steel are provided at the bottom and top of the formwork for tie rods. All standardized formwork for the cap beam is made of steel. The steel formwork panel is made of 8mm thick steel plate and 12mm stiffener. The outer side of the panel is made of 2 channel steel for the horizontal ribs and 2 double channel steel for the vertical ribs. The maximum spacing is 90-100cm. The bolted surfaces of the formwork are bolted together. All joints of the formwork segments are bolted together. The gaps are filled and sealed with rubber pads. The lifting device includes a balance beam (33) and a lifting plate (34). The balance beam (33) is rectangular. Both ends of the balance beam (33) are slidably connected to telescopic blocks (331). The telescopic blocks (331) slide relative to each other along the length of the balance beam (33). A telescopic groove (35) for the telescopic blocks (331) to slide is opened through the balance beam (33). The telescopic blocks (331) fit against the inner wall of the telescopic groove (35). A clamping element is provided at the end of the telescopic block (331) away from the balance beam (33). The clamping element is a clamp (36) that can clamp the steel bars located on the steel cage. The lifting device also includes a lifting plate. The lifting plate has a hollow center and is equipped with a hook. The lifting device also includes a flip cover, a fixing block, and an oil injection hole. The flip cover is installed on the fixing block. An adjusting screw is installed under the flip cover to adjust the travel of the telescopic blocks.

6. The construction structure of the large cantilever prestressed cast-in-place cap beam system for steel pipe Bailey beam support in water-rich soft soil according to claim 1, characterized in that: The crossbeam and channel steel frame structure (38) of the tensioning operation platform device are welded together. The crossbeam system and the second main beam (37) are welded together using triangular diagonal braces. The joint position is reinforced with stiffening plates (41). The crossbeam and the platform frame structure (38) are connected by crossbeam connecting rods. A steel pipe (42) is set above the crossbeam to facilitate the suspension of jacks during tensioning operations. The bottom platform skeleton is formed by welding channel steel. Square timber (43) and templates are laid on the platform skeleton. The bottom platform kick plate (44) is set above the bottom platform (39). The entire bottom platform (39) is surrounded by a safety net (45). After the frame structure (38) is assembled, the crossbeam is locked and anchored by inserting expansion bolts through the anchoring holes (40). The wire rope passes through the pre-drilled hole of the annular wire rope at the end of the second main beam (37) and wraps around the cross section of the cap beam to form a clamp. The end of the annular wire rope is connected to the hand-operated hoist. The main beam and the cap beam are fixed by tightening the hand-operated hoist.

7. The construction structure of the large cantilever prestressed cast-in-place cap beam system for steel pipe Bailey beam support in water-rich soft soil as described in claim 6, characterized in that: The maintenance operation platform device has a pair of fixed rails (58) spaced apart from each other, which are set along the longitudinal length of the cap beam concrete. One end of each fixed rail (58) is hinged to a folding rail (59) that is horizontally connected to it and can be folded upward. Each fixed rail (58) has a support leg (60) that can be placed on the cap beam concrete on the lower side of the hinged end. A water tank (57) is set between the pair of fixed rails (58). A pair of sliding devices are set opposite to each other on the pair of fixed rails (58). A spraying device is set on the lower side of each sliding device. The pair of sliding devices drive the spraying device to reciprocate along the pair of fixed rails (58) and the pair of folding rails (59) to spray the cap beam concrete. The sliding device includes a rack (61) disposed on the outer side of a pair of fixed rails (58) and a folded rail (59). Each fixed rail (58) has a fixed plate seat (46) spaced at its lower end. The outer lateral end of each fixed plate seat (46) extends out of the end face of the rack (61) on the same side. A first reducer (47) is disposed on the outer lateral end plate of each fixed plate seat (46). Drive gears (48) that mesh with the rack (61) on the same side are respectively disposed on both sides of the first reducer (47). Each drive gear (48) is connected to a coaxial transmission shaft (49). Each drive shaft (49) extends downward from the end of the fixed plate seat (46) and is connected to a coaxial drive sprocket. The first reducer (47) is meshed with the drive sprocket through the drive sprocket (50). The fixed groove rail (58) or the folded groove rail (59) is embedded with a roller mechanism that slides along its axial direction. The roller mechanism is provided with a fixed hanger (51) extending from the fixed groove rail (58) or the folded groove rail (59). The end of the fixed hanger (51) is connected to the transverse inner end plate surface of the fixed plate seat (46). The lower side of a pair of fixed plate seats (46) is connected to a spraying device. A pair of fixed rails (58) and a pair of folded rails (59) have the same structure. The cross-section of the fixed rail (58) is a slotted structure with a groove at the bottom. The groove runs through the longitudinal direction of the fixed rail (58). The ends of the pair of fixed rails (58) and the pair of folded rails (59) are hinged and folded to facilitate the movement of the curing device between adjacent cap beam concrete. When moving, the folded rail (59) forms a folded state along the fixed rail (58) to reduce the length of the intelligent curing device before moving. After the movement is completed, the folded rail (59) is rotated open and connected to the fixed rail (58) as a whole. The fixed rail (58), the folded rail (59) and the four legs (60) are longitudinally supported on the cap beam concrete.

8. The construction structure of the large cantilever prestressed cast-in-place cap beam system for steel pipe Bailey beam support in water-rich soft soil as described in claim 7, characterized in that: The spraying device includes a spraying water pipe connected to the lower end of a pair of fixed plate seats (46), and a nozzle (52) is provided on the spraying water pipe. The spraying water pipe is arranged in sequence around the lower end of the two fixed plate seats (46) to cover the transverse surface of the cap beam concrete. The movable spraying intelligent curing cap beam operation platform also includes a humidity sensor, which is connected to the intelligent control box (55).

9. The construction structure of the large cantilever prestressed cast-in-place cap beam system for steel pipe Bailey beam support in water-rich soft soil according to any one of claims 1-8, characterized in that: When the maintenance operation platform device is in use, the entire device is hoisted and placed on the top of the bridge cap beam concrete by the lifting ring (53), the second reducer (54) is started to rotate and open the folding groove rail (59) and align it with the fixed groove rail (58), so that the support leg (60) is firmly supported on the cap beam concrete, and the water inlet pipe of the water tank (57) is connected.

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