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

Abstract

The invention discloses a construction method of a water-rich soft soil steel pipe bailey beam support large cantilever prestress cast-in-place bent cap system, which comprises the steps of designing and constructing a large cantilever bent cap steel pipe bailey beam support system, and ensuring 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 invention 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] The present invention relates to the field of prestressed cast-in-situ cap beam construction, and in particular to a construction method of a large cantilever prestressed cast-in-situ cap beam system of a water-rich soft soil steel pipe Bailey beam support. Background Art

[0002] The construction of large-section overloaded frame beams is becoming more and more common. The beam reinforcement skeleton has the characteristics of complex structure, heavy weight, and multiple spans. During the construction of the beam reinforcement skeleton, the beam bottom pads are often cracked and the pads cannot be fully set in place, resulting in insufficient thickness of the concrete protective layer at the bottom of the beam, and even causing the beam bottom to be exposed after the concrete is poured. It is difficult to accurately control the spacing of the hoop reinforcement, the spacing of the main reinforcement, and the position of the embedded parts of the on-site assembled steel cage, which makes the stress of the poured finished product deviate from the design drawings. The on-site binding of the steel cage requires workers with professional knowledge to bind, which has high labor costs, slow speed, and low efficiency. The traditional method of concrete maintenance is to arrange special personnel to water with water pipes for maintenance. When facing large-span concrete cap beams, the maintenance efficiency is low and the effect is poor. Summary of the invention

[0003] The object of the present invention is to provide a construction method of a large cantilever prestressed cast-in-place cap beam system of a water-rich soft soil steel pipe Bailey beam support to solve the above-mentioned technical problems.

[0004] In order to achieve the above object, the present invention provides a construction method of a water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system, comprising the following steps:

[0005] Support system construction: Set up a cap beam support system including support foundation, columns, supporting beams, Bailey frame load-bearing structure, buckle bracket, distribution beam and supporting formwork. The support foundation is treated differently according to different location conditions. The columns are installed by setting the connection method and the top support structure is set. After the installation is completed, the support bearing capacity test and preloading are carried out. The preloading process includes loading, monitoring and qualification judgment;

[0006] Cap beam frame processing: Make an integral tyre frame of the cap beam frame with a specific structure, use the tyre frame to make and tie the cap beam reinforcement frame, use a movable precise positioning slot to assist the precise placement of the reinforcement, and set specific buffering and fixing measures;

[0007] Formwork and hoisting operation: Use a cap beam standardized formwork with a specific structure, and hoist the formwork through a hoisting device with a specific structure and function. The formwork connection and tensioning settings meet specific requirements;

[0008] Construction of tensioning operation platform: construct a prestressed cap beam tensioning hanging operation platform including main beam, frame structure, bottom platform and anchor holes, carry out corresponding welding, connection and reinforcement operations, and set up tensioning operation auxiliary structures and safety protection facilities;

[0009] Maintenance operation platform setting: A movable spraying intelligent maintenance cap beam operation platform is adopted, including a water tank, a spraying device and a movable track structure. The timed spraying maintenance of the cap beam concrete is realized through specific moving, supporting, driving and control devices. The platform has humidity monitoring and automatic control spraying functions.

[0010] Furthermore, in the construction of the support system, when the support foundation is located on the asphalt pavement, a C25 concrete leveling layer is poured on the asphalt pavement for leveling; when the support foundation is located on the gravel backfill layer around the pedestal, a concrete enlarged foundation with a size of 2.0m×2.0m is poured on the gravel backfill layer.

[0011] Furthermore, in the construction of the support system, the columns are composed of standard sections and adjustable sections. Flange connections are used between standard sections and between standard sections and between adjustable sections. The top supporting steel plate is circular and 10 mm thick. Its diameter is 6 cm larger than the diameter of the spiral pipe. The edge protection structure of the construction platform adopts an assembled protective net guardrail. The bottom of the guardrail is a platform steel plate. A protective mesh with an angle iron frame is installed or welded on the outer edge of the platform steel plate.

[0012] Furthermore, in the processing of the cap beam skeleton, the main beam of the overall tyre frame of the cap beam skeleton is made of two 20a channel steels, and is provided with a number of limit holes. The limit holes are plugged with steel pipes and cooperate with the limit holes to form stirrup limit; the support beam is connected to the main beam and arranged along the support beam, including an upper support beam, a middle support beam and a bottom support beam. The upper support beam is connected to the top of the main beam and is made of I-beam. A triangular support is set at the overlap with the main beam and is fully welded to support the upper main reinforcement of the large cap beam reinforcement skeleton; the middle support beam is made of 8×8cm square steel pipes and is set at the overlap with the main beam. The triangular support is fully welded and its function is to support the upper main reinforcement of the general cap beam reinforcement skeleton; the bottom supporting beam is connected to the bottom of the main beam and is made of I-beam, and is fully welded to the bottom longitudinal beam, and its function is to support the lower main reinforcement of the cap beam reinforcement skeleton; the stirrup limiter is made of small steel pipes welded to the main beam, and round steel is inserted into the limiting hole, and is arranged between the supporting beams; the bottom longitudinal beam is equipped with a bottom longitudinal beam connecting rod, the bottom longitudinal beam is respectively connected to the two ends of the bottom longitudinal beam connecting rod, the main beam is connected to one of the bottom longitudinal beams, the bottom longitudinal beam connecting rod is made of I-beam, and is fully welded to the two parallel bottom longitudinal beams.

[0013] Furthermore, in the cap beam skeleton processing, the movable precise positioning slot includes a transverse bottom plate steel bar positioning slot, which is made of two symmetrical angle steels; a longitudinal bottom plate steel bar positioning slot, which is made of a flat plate with multiple grooves, and bolt fixing plates are welded on both sides of the longitudinal bottom plate steel bar positioning slot; a movable pulley is bolted to the lower part of the transverse bottom plate steel bar positioning slot; a U-shaped support frame, including a U-shaped steel bar and a rubber cushion sleeve, the rubber cushion sleeve is installed at the lower part of the U-shaped steel bar, the height of the U-shaped frame is calculated according to the construction drawings, and the steel bars of the U-shaped support frame are processed and made of the leftovers generated by the steel bar construction at the construction site, during the cutting process;

[0014] After the cap beam reinforcement skeleton is tied, place buffer wood blocks above the beam mouth template perpendicular to the estimated direction of the beam reinforcement near the U-shaped support frame before sinking the beam, and the height should be higher than the height of the vertical reinforcement of the U-shaped support frame. After the beam is sunk, place the entire beam body on the buffer square bars. Before fixing the U-shaped support frame, select a suitable rubber pad model, and firmly fix the port of the U-shaped support frame. The height of the buffer square bar should be slightly higher than the height of the U-shaped support frame. After the U-shaped support frame passes through the bottom of the upper longitudinal reinforcement of the beam, its port is vertically downward, and the intersection of the upper longitudinal reinforcement of the upper beam is fixed by binding. After the U-shaped support frame is fixed, take out the buffer wood blocks.

[0015] Furthermore, in the formwork and hoisting operation, the cap beam finalized formwork includes an outer formwork, a bottom formwork, a side formwork, and a connecting section. The side formwork and the bottom formwork are connected by bolts, and the gaps are sealed with rubber plugs. The side formwork segment joints are all connected by bolts, and the gaps are sealed with rubber plugs. Two rows of precision-rolled threaded steel are set at the bottom and top of the formwork for tensioning. The cap beam finalized formwork is made of steel formwork, and the steel formwork panel is made of 8mm thick steel plate, 12mm rib plate, two-channel steel for the transverse rib steel on the outside of the panel, and 18 double-jointed channel steel for the vertical rib steel, with a maximum spacing of 90-100cm. The formwork bolting surface is bolted, and the formwork segment joints are bolted. The air The gap is padded with rubber pads; the lifting device includes a balance beam and a lifting plate. The balance beam is in a rectangular shape. Both ends of the balance beam are slidably connected with telescopic blocks. The telescopic blocks slide relatively along the length direction of the balance beam. A telescopic groove for the telescopic block to slide is opened through the balance beam. The telescopic block fits with the inner wall of the telescopic groove. A clamp is provided on the end of the telescopic block away from the balance beam. The clamp is a clamp that can clamp the steel bars on the steel cage. The lifting device also includes a lifting plate. The middle part of the lifting plate is hollow and is equipped with a hook. The lifting device also includes a flap, a fixed block, and an oil filling hole. The flap is installed on the fixed block. An adjusting screw is installed under the flap to adjust the stroke of the telescopic block.

[0016] Furthermore, in the construction of the tensioning operation platform, the crossbeam of the prestressed cap beam tensioning hanging operation platform is welded to the frame structure composed of channel steel, the crossbeam system and the main beam are welded by using triangular diagonal rods, the intersection position is reinforced by stiffening plates, the crossbeam and the platform frame structure are connected by crossbeam connecting rods, a steel pipe is arranged above the crossbeam to facilitate the hanging of the jack during the tensioning operation, the bottom platform skeleton is formed by welding with channel steel, square wood and templates are laid on the platform skeleton, and a bottom platform skirting board is arranged above the bottom platform, and a safety net is arranged around the entire bottom platform. After the frame structure is assembled, the crossbar is locked, and the expansion screws are driven through the anchor holes to anchor it. The wire rope passes through the reserved hole for the annular wire rope at the end of the main beam and surrounds the cross section of the cap beam to form a hoop state, and the end of the annular wire rope is connected to the hand winch, and the main beam and the cap beam are fixed by tightening the hand winch.

[0017] Further, in the setting of the maintenance operation platform, a pair of mutually spaced fixed groove rails of the movable spray intelligent maintenance cap beam operation platform are arranged along the longitudinal length direction of the cap beam concrete, one end of each fixed groove rail is hinged with a folding groove rail that is horizontally connected with it and can be folded upward, and the lower side of the hinged end of each fixed groove rail is respectively provided with a support leg that can be placed on the cap beam concrete, a water tank is arranged between the pair of fixed groove rails, a pair of sliding devices are relatively arranged on the pair of fixed groove rails, and a spraying device is arranged on the lower side of each sliding device, and the pair of sliding devices respectively drive the spraying device to move back and forth along the pair of fixed groove rails and the pair of folding groove rails to drive the spraying device to spray the cap beam concrete;

[0018] The sliding device includes a rack arranged on the outer side of a pair of fixed groove rails and a folding groove rail, each fixed groove rail is provided with a fixed plate seat at intervals at the lower end, and the lateral outer end of each fixed plate seat extends the end face of the rack on the same side, and a first reducer is arranged on the lateral outer end plate surface of each fixed plate seat, and driving gears meshing with the rack on the same side are respectively arranged on both sides of the first reducer, and a coaxial transmission shaft is connected to each driving gear, and the end of each transmission shaft extending downward from the fixed plate seat is connected to the coaxial transmission sprocket, and the first reducer is meshed with the transmission sprocket through the driving sprocket, and a roller mechanism sliding along its axial direction is embedded in the fixed groove rail or the folding groove rail, and a fixed suspension rod extending from the fixed groove rail or the folding groove rail is arranged on the roller mechanism, and the fixed suspension rod extends out The ends are connected to the transverse inner end plate surface of the fixed plate seat, and the lower sides of a pair of fixed plate seats are connected to the spraying device; a pair of fixed groove rails and a pair of folding groove rails have the same structure, and the cross-section of the fixed groove rails is a hole-shaped structure with a notch at the bottom, and the notch runs through the longitudinal direction of the fixed groove rails. The ends of a pair of fixed groove rails and a pair of folding groove rails are hinged and folded to facilitate the movement of the maintenance device between adjacent cap beam concretes. When moving, the folding groove rail forms a folded state along the fixed groove rail to reduce the length of the intelligent maintenance device and then move. When the movement is completed, the folding groove rail is rotated to open and connected to the fixed groove rail as a whole. The fixed groove rail, the folding groove rail and are longitudinally supported on the cap beam concrete by four legs. The supporting length of the four legs can make the spraying device and the sliding device separate from the upper surface of the cap beam concrete.

[0019] Furthermore, the spraying device includes a spraying water pipe connected to the lower end of a pair of fixed plate seats, and a spray head is arranged on the spraying water pipe. The spraying water pipe is arranged around the lower ends of the two fixed plate seats in sequence to cover the lateral surface of the cap beam concrete; the movable spraying intelligent maintenance cap beam operation platform also includes a humidity sensor, and the humidity sensor is connected to the intelligent control box. When the humidity of the cap beam concrete is lower than the set value, the intelligent control box automatically controls to turn on the water pump for spraying.

[0020] Furthermore, when the movable spraying intelligent maintenance cap beam operating platform is used, the entire device is hoisted through the lifting ring and placed at the top position of the bridge cap beam concrete, the second reducer is started to rotate and open the folding groove rail to align and engage with the fixed groove rail, so that the support legs are firmly supported on the cap beam concrete, the water inlet pipe of the water tank is connected, and the maintenance time of the cap beam concrete is set on the intelligent control box. When the set time is reached, the water pump will be automatically controlled to start spraying, and the first reducer is started at the same time to make the spraying device move along the fixed groove rail and the folding groove rail to perform regular maintenance operations on the cap beam concrete.

[0021] The beneficial effects of the present invention compared with the prior art are as follows:

[0022] 1) The large cantilever cap steel tube Bailey beam support construction technology has the characteristics of convenient lap joint and easy connection, which improves the efficiency of Bailey beam support erection and improves the material turnover rate at the construction site.

[0023] 2) The integrated cap beam frame technology realizes the overall processing and lifting of the cap beam frame, improves the integrity of the cap beam frame, and optimizes the lifting process of the cap beam frame.

[0024] 3) The standardized support auxiliary cap beam steel bar precise sinking technology realizes the precise binding of steel bars and the protection of steel bar skeleton. The steel bar positioning slot can be moved laterally, reducing the amount of steel plate used in the slot.

[0025] 4) The counterweighted conduit of the present invention is based on the principle of increasing deadweight and reducing buoyancy by immersion in water, and can be stably embedded in the borehole, thereby ensuring the quality of the borehole by preventing silt, gravel, etc. from backflowing and blocking the borehole. At the same time, it can further serve as a guide tube for charging and backfilling, effectively improving charging efficiency and quality;

[0026] 5) Movable spraying intelligent curing cap beam operation platform ensures uniform spraying during concrete curing and improves concrete quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the main view of the cap beam steel tube Bailey beam support system.

[0028] Figure 2 It is a schematic diagram of the main view of the integral tyre frame for the cap beam.

[0029] Figure 3 It is a schematic diagram of the side view of the precise positioning slot for steel bar binding.

[0030] Figure 4 It is a schematic diagram of the main view of the U-shaped support frame.

[0031] Figure 5 It is a schematic diagram of the side view of the cap beam finalized template.

[0032] Figure 6 It is a schematic diagram of the main view of the cap beam standardization template.

[0033] Figure 7 It is a schematic diagram of the steel cage lifting and stabilizing device.

[0034] Figure 8 This is a schematic diagram of the prestressed cap beam tensioning and hanging operating platform.

[0035] Fig. 9 It is a schematic diagram of the main structure of the intelligent maintenance device for bridge cap beam concrete.

[0036] In the figure: 1-I-beam; 2-column; 3-I-beam support beam; 4-Bailey frame load-bearing structure; 5-disc bracket; 6-steel pipe column; 7-bracket foundation; 8-distribution beam; 9-support formwork; 10-bottom flange; 11-high-strength bolt; 12-adjustment section; 13-top support steel plate; 14-platform steel plate; 15-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 steel bar positioning slot; 24-longitudinal bottom plate steel bar positioning slot; 25-bolt fixing plate; 26-movable pulley; 27-U-shaped support frame; 28-rubber pad; 29-U-shaped steel bar; 30-bottom formwork; 31-side formwork; 3 2-connecting section; 33-balance beam; 331-telescopic block; 332-oil filling hole; 34-lifting plate; 341-hook; 35-telescopic slot; 351-flip cover; 352-fixed block; 36-clamp; 37-main beam; 38-frame structure; 39-bottom platform skeleton; 40-anchor hole; 41-stiffening plate; 42-steel pipe; 43-square wood; 44-skirting board; 45-safety net; 46-fixed plate seat; 47-first reducer; 48-drive gear; 49-drive shaft; 50-drive sprocket; 51-fixed boom; 52-sprinkler; 53-lifting ring; 54-second reducer; 55-intelligent control box; 56-water pump; 57-water tank; 58-fixed groove rail; 59-folding groove rail; 60-support leg; 61-rack. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0038] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0039] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0040] The present invention provides a construction method for a water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system, such as Figure 1-9 As shown, the construction method includes the following steps:

[0041] Step 1: Design and construction of large cantilever cap steel tube Bailey beam support system:

[0042] The cap beam support system includes a support foundation 7, a φ500mmx8mm column 2, a double-jointed I40a I-beam supporting crossbeam 3, a standard 321-type Bailey frame load-bearing structure on the crossbeam 4, a disc-shaped support 5, an I20a I-beam distribution crossbeam 8, and an I10 I-beam supporting formwork 9.

[0043] The support structure is equipped with 6 groups of columns 2, with a horizontal spacing of 6.0m and a vertical spacing of 3.3m. The columns 2 are 500mm×8mm round tube structures. Double I40a I-beams are set above the steel pipe as supporting beams 3, and four groups of standard 321 Bailey frames 4 are arranged on the beams as the main load-bearing structure. A buckle bracket 5 is set above the Bailey frame to achieve height adjustment to meet the requirements of different pier heights. The bottom of the buckle bracket 5 uses I20a I-beams as distribution beams 8, and the top is set with I10 I-beam support templates 9.

[0044] During the support construction, a C30 reinforced concrete support foundation 7 of 1.2m×1.5m×0.7m (length×width×height) is used. When the support foundation 7 is placed on the asphalt pavement, a C25 concrete leveling layer is poured on the asphalt pavement to level the foundation of the precast concrete block (support foundation 7); when the precast block is located on the gravel backfill layer around the pedestal, a concrete expanded foundation is poured on the gravel backfill layer, and the size of the expanded foundation is 2.0m×2.0m.

[0045] The steel pipe column 6 is installed, and the flange 10 at the bottom end of the steel pipe column 6 is butted against the high-strength bolts 11 on the concrete prefabricated block steel plate. The steel pipe column 6 is composed of a standard section and an adjustment section 12. Flange connections are used between the standard sections and between the standard sections and the adjustment sections 12. After the standard sections are installed, the adjustment sections 12 are installed according to the calculated steel pipe height.

[0046] A supporting steel plate 13 is welded to the top of the spiral pipe. The supporting steel plate 13 is circular and 10 mm thick. Its diameter is 6 cm larger than the diameter of the spiral pipe. An I-beam crossbeam is placed on the supporting steel plate 13.

[0047] After the installation of the buckle bracket 5 is completed, the edge protection structure of the construction platform is installed, and an assembled protective net guardrail is adopted. The bottom of the guardrail is a platform steel plate 14, and a protective mesh with an angle iron frame is installed or welded on the outer edge of the platform steel plate 14.

[0048] The support bearing capacity test should be loaded at 1.1 times the deadweight of the cap beam structure and the formwork load, and the formula is "preloading load = (deadweight of concrete + weight of steel bars + weight of steel strands + weight of formwork + construction load) x 1.1", to ensure that the bearing capacity meets the requirements of the "Technical Specifications for Preloading of Steel Pipe Full-Span Support" (JGJ / T194-2009). The support preloading should ensure that the tarpaulin, thick patterned steel plate, etc. are ready, and the I-beams are arranged along the cross bridge at a fixed spacing, and the spacing is flexibly adjusted according to the size of the preloading concrete block. Before preloading, attention should be paid to whether the support part is stable, ensure that the preloading weight at each point is symmetrical, and keep records. During the preloading process, the load should be graded according to 60%, 80%, and 100% of the total preloading load value, and observation records should be kept. The lateral loading and longitudinal loading should be kept at an interval of 12h as required. When the average settlement value of each monitoring point for 24 consecutive hours is less than 1mm, the support foundation and support preloading should be judged to be qualified. When the average settlement value of each monitoring point for 72 consecutive hours is less than 5mm, the support foundation and support preload should also be judged to be qualified.

[0049] Step 2: Production and installation of integrated cap beam frame:

[0050] The cap beam skeleton is an integrally tied frame, which includes a main beam 15, a supporting beam 16, a bottom longitudinal beam 19 and a stirrup limiter 18; a single main beam 15 is spliced ​​by two 20a channel steels to ensure the strength and rigidity of the main beam 1; the main beam 15 is provided with a plurality of limit holes, in which steel pipes are inserted, and the steel pipes and the limit holes cooperate to form stirrup limiters; further, the stirrup limiters 18 are welded to the main beam 15 with small steel pipes, and round steels are inserted into the limit holes to form stirrup limiters 18, which are used to position the cap beam stirrups and ensure the linearity and accuracy of the stirrups.

[0051] The joist 16 is connected to the main beam 15 and arranged along the joist 16, the stirrup limiter 18 is connected to the main beam 15 and the stirrup limiter 18 is arranged between the joists 16. Further, the joist 16 includes an upper joist 19, a middle joist 20 and a bottom joist 21, the bottom of the main beam 15 is connected to the bottom longitudinal beam 19, the upper joist 19 is connected to the top of the main beam 15, the bottom joist 21 is connected adjacent to the bottom of the main beam 15, and the middle joist 20 is arranged between the upper joist 19 and the bottom joist 21. The connection between the upper joist 19 and the middle joist 20 and the main beam 15 is respectively welded with a support frame 17 to form a triangular support. The upper supporting beam 19 is made of I-beam No. 10, and a triangular support is set at the overlap between the upper supporting beam 19 and the main beam 15 and is fully welded. The upper supporting beam 19 serves to support the upper main reinforcement of the large cap beam reinforcement skeleton; the middle supporting beam 20 is made of 8×8cm square steel pipe, and a triangular support is set at the overlap between the middle supporting beam 20 and the main beam 15 and is fully welded. The middle supporting beam 20 serves to support the upper main reinforcement of the general cap beam reinforcement skeleton; the bottom supporting beam 21 is made of I-beam No. 10, and the bottom supporting beam 21 is fully welded to the bottom longitudinal beam 19, and the bottom supporting beam 21 serves to support the lower main reinforcement of the cap beam reinforcement skeleton.

[0052] The bottom longitudinal beam 19 is provided with a bottom longitudinal beam connecting rod 22, the bottom longitudinal beam 19 is respectively connected to both ends of the bottom longitudinal beam connecting rod 22, and the main beam 15 is connected to one of the bottom longitudinal beams 19. The bottom longitudinal beam connecting rod 22 is made of I-10 I-beam, and the bottom longitudinal beam connecting rod 22 is fully welded with two parallel bottom longitudinal beams 19. The bottom longitudinal beam connecting rod 22 plays the role of connecting the two bottom longitudinal beams 19, so that the cap beam frame is integrally tied to the tire frame to form a whole, thereby improving the overall stability of the tire frame.

[0053] Step 3: Use standardized support to assist the accurate placement of cap beam reinforcement:

[0054] The movable precise positioning slot comprises a transverse bottom plate steel bar positioning slot 23 , a longitudinal bottom plate steel bar positioning slot 24 , a bolt fixing plate 25 , a movable pulley 26 , and a U-shaped support frame 27 .

[0055] 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 bolted to the lower part of the transverse bottom plate reinforcement positioning slot 23.

[0056] The U-shaped support frame 27 includes a U-shaped steel bar 29 and a rubber sleeve 28. The rubber sleeve 28 is installed at the bottom of the U-shaped steel bar 29. The height of the U-shaped frame is calculated according to the construction drawings, and the calculation method is: the steel bar height of the U-shaped support frame 27 = plate thickness - beam steel bar protective layer thickness - beam stirrup diameter - first row beam surface longitudinal bar diameter - rubber sleeve thickness. The steel bars of the U-shaped support frame 27 are processed and manufactured using the leftover materials generated by the steel bar construction on the construction site. The vertical reinforcement cutting and manufacturing of the U-shaped support frame 27 should be strictly manufactured according to the calculated data to ensure that the beam bottom reinforcement protective layer is sufficient and the beam slab steel bar protective layer thickness also meets the design requirements. During the cutting process, if the steel bars are found to be split, shrunk or severely bent, they must be removed.

[0057] After the steel frame of the cap beam is processed and formed, it is transferred to the steel frame binding area in the field for the steel frame binding. The self-made steel frame binding platform is used to bind the steel frame of the cap beam, so that the steel frame can be better bound and the steel bar installation is quick and convenient. When using the tire frame, you only need to hang the skeleton sheet on the cantilever frame and install it in place using the special slot. The horizontal and longitudinal bars also have special slots to provide precision guarantee for the overall steel bar binding of the cap beam. When the steel bars of the cap beam skeleton are tied in the back field, the top stirrups and the steel bars of the skeleton sheet are fixed by CO2 gas shielded welding spot welding, and the side and bottom stirrups are fixed by wire binding. After the steel bar binding is completed, a buffer wooden square should be placed above the beam mouth template perpendicular to the estimated direction of the beam steel bar near the U-shaped support frame 27 before sinking the beam, and the height should be slightly higher than the height of the vertical steel bars of the U-shaped support frame 27. Prevent the U-shaped support frame 27 from being deformed due to the worker's operating error during the sinking process. After the sinking of the beam is completed, the entire beam body is placed on the buffer square bar to facilitate the placement of the U-shaped support frame 27. Before fixing the U-shaped support frame 27, you should choose a suitable rubber pad model and put it firmly on the end of the U-shaped support frame 27. The height of the buffer square bar should be slightly higher than the height of the U-shaped support frame 27. After the U-shaped support frame 27 passes under the upper longitudinal reinforcement of the beam, its end is vertically downward, and the intersection of the upper longitudinal reinforcement of the upper beam is tied and fixed. After the U-shaped support frame 27 is fixed, take out the buffer wood.

[0058] Step 4: Forming and hoisting the cap beam:

[0059] The cap beam forming template includes an outer template 37, a bottom template 30, a side template 31, and a connecting section 32. The side template 31 is connected to the bottom template 30 by bolts, and the gap is sealed with a rubber plug. The template segment joints of the side template 31 are all connected by bolts, and the gap is sealed with a rubber plug. Two precision-rolled threaded steel bars are set at the bottom and top of the template for tensioning.

[0060] The cap beam standard formwork is made of steel formwork. No tie rods are set for the cap beam concrete in the outer formwork 37. The steel formwork panel is made of 8mm thick steel plate, the rib plate is 12mm, the transverse rib steel on the outside of the panel is made of 2 channel steel, and the vertical rib steel is made of double-jointed channel steel 18, with a maximum spacing of 90 to 100cm. The formwork bolting surface is bolted, and the formwork segment joints are bolted, and rubber pads are used to fill the gaps. The bottom of the formwork is bolted, and two precision-rolled threaded steel bars are set at the bottom and top for tensioning.

[0061] The lifting device includes a balance beam 33 and a lifting plate 34. The balance beam 33 is in a rectangular shape. Both ends of the balance beam 33 are slidably connected with telescopic blocks 331. The telescopic blocks 331 slide relatively along the length direction of the balance beam 33. The balance beam 33 is provided with a telescopic slot 35 for the telescopic block 331 to slide. The telescopic block 331 fits with the inner wall of the telescopic slot 35. The end of the telescopic block 331 away from the balance beam 1 is provided with a clamp. In the embodiment of the present application, the clamp is a clamp 36. The clamp 36 can clamp the steel bars on the steel cage. Before clamping the steel 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 flap 351, a fixed block 352, and an oil filling hole 332. The flap 351 is installed on the fixed block 352. An adjusting screw is installed under the flap 351 to adjust the travel of the telescopic block.

[0062] Step 5: Prestressed cap beam tensioning hanging operation platform:

[0063] The prestressed cap beam tensioning hanging operation platform includes a main beam 37, a frame structure 38, a bottom platform 39, and anchor holes 40.

[0064] The frame structure 38 composed of the crossbeam and the channel steel is welded, the crossbeam system and the main beam 37 are welded by triangular diagonal rods, the intersection is reinforced by stiffening plates 41, the crossbeam and the platform frame structure 38 are connected by crossbeam connecting rods, and a steel pipe 42 is arranged above the crossbeam to facilitate the hanging of the jack during the tensioning operation. The bottom platform frame 39 is formed by welding the channel steel, square wood 43 and templates are laid on the platform frame, and the bottom platform skirting board 44 is arranged above the bottom platform 39, and a safety net 45 is arranged around the entire bottom platform 39; after the frame structure 38 is assembled, the crossbar is locked, and expansion screws are driven into the anchor holes 40 for anchoring, the wire rope passes through the ring wire rope reserved hole at the end of the main beam 37 and surrounds the cross section of the cap beam to form a hoop state, the end of the ring wire rope is connected to the hand chain hoist, and the main beam and the cap beam are fixed by tightening the hand chain hoist. After the entire frame platform and the cast-in-place cap beam are anchored, the hoisting equipment performs the tensioning operation.

[0065] Among them, the bottom formwork 30 of the cap beam adopts a steel formwork composed of a middle straight section and cantilever sections on both sides. The axes of the cap beam in the transverse and longitudinal directions of the bridge are laid out, the edge lines of the cap beam are determined according to the laid out center line, and the elevation of the bottom formwork is adjusted to make the elevation and slope of the bottom formwork consistent with the design. Rubber strips are attached to the side surfaces before installation of the formwork joints. Before installing the bottom formwork, the top surfaces of the piers are roughened.

[0066] Step 6: Movable spray intelligent maintenance cap beam operation platform:

[0067] The movable spraying intelligent maintenance cap beam operation platform includes: a water tank 41, a spraying device is connected to the water tank 41, a pair of fixed groove rails 42 spaced apart from each other are arranged along the longitudinal length direction of the cap beam concrete, one end of each fixed groove rail 42 is hinged with a folding groove rail 43 horizontally connected thereto and foldable upward, and a support leg 44 which can be placed on the cap beam concrete is respectively arranged on the lower side of the hinged end of each fixed groove rail 42, and the support leg 44 can support the ends of the fixed groove rail 42 and the folding groove rail 43 in a horizontal state, a water tank 41 is arranged between the pair of fixed groove rails 42, a pair of sliding devices are relatively arranged on the pair of fixed groove rails 42, and a spraying device is arranged on the lower side of each sliding device, and the pair of sliding devices respectively drive the spraying device to reciprocate relative to the pair of fixed groove rails 42 and the pair of folding groove rails 43 to drive the spraying device to spray the cap beam concrete.

[0068] The pair of fixed groove rails 42 and the pair of folding groove rails 33 have the same structure. The cross section of the fixed groove rail 42 is a slot-shaped structure with a notch at the bottom, and the notch runs through the longitudinal direction of the fixed groove rail 42. The ends of the pair of fixed groove rails 42 and the pair of folding groove rails 43 are hinged and folded to facilitate the movement of the maintenance device between adjacent cap beam concretes. When moving, the folding groove rail 43 forms a folded state along the fixed groove rail 42 to reduce the length of the intelligent maintenance device before moving. When the movement is completed, the folding groove rail 43 is rotated and opened to connect with the fixed groove rail 42 as a whole. The fixed groove rail 42, the folding groove rail 43 and the four legs 44 are longitudinally supported on the cap beam concrete. The support length of the four legs 44 can make the spraying device, the sliding device, etc. separate from the upper surface of the cap beam concrete.

[0069] The sliding device includes a rack 45 arranged on the outer side of a pair of fixed groove rails 42 and a folded groove rail 43, and a fixed plate seat 46 is arranged at intervals at the lower end of each fixed groove rail 42. The lateral outer end of each fixed plate seat 46 extends out of the end face of the same side rack 45, and a first reducer 47 is arranged on the lateral outer end plate surface of each fixed plate seat 46. The first reducer 47 is provided with a driving gear 48 meshing with the same side rack 45 on both sides, and each driving gear 48 is connected to a coaxial transmission shaft 49, and each transmission shaft 49 extends downward from the end of the fixed plate seat 46 and is connected to the end of the fixed plate seat 46. There is a transmission sprocket with coaxial transmission, and the first reducer 47 is meshed and connected with the transmission sprocket through the driving sprocket 50; a roller mechanism that slides along its axial direction is embedded in the fixed groove rail 42 or the folding groove rail 43, and a fixed suspension rod 51 extending from the fixed groove rail 42 or the folding groove rail 43 is provided on the roller mechanism, and the end extending from the fixed suspension rod 51 is connected to the transverse inner end plate surface of the fixed plate seat 46, and the lower side of a pair of fixed plate seats 46 is connected to a spray device, and the first reducer 47 drives a pair of driving gears 48 on both sides to move along the rack 45 to drive the fixed plate seat 46 to move longitudinally.

[0070] The spraying device includes a spraying water pipe connected to the lower end of a pair of fixed plate seats 46, a spray head 52 is arranged on the spraying water pipe, and the spraying water pipe is connected to the water tank 41. The spraying water pipe is sequentially arranged around the lower end of the two fixed plate seats 46 to cover the transverse surface of the cap beam concrete. When spraying, the pair of spraying devices reciprocate along the longitudinal ends of the cap beam concrete to spray, and the spraying device at each end moves from the middle position of the pair of fixed groove rails 42 to the ends of the folded groove rails 43 on both sides to realize the spraying operation of the upper part of the entire cap beam concrete.

[0071] When the movable spraying intelligent maintenance cap beam operating platform is in use, the entire device is hoisted through the lifting ring 53 and placed at the top position of the bridge cap beam concrete, the second reducer 54 is started to rotate and open the folding groove rail 43 to align and engage with the fixed groove rail 42, so that the support legs 44 are actually supported on the cap beam concrete, the water inlet pipe of the water tank 41 is connected, and the maintenance time of the cap beam concrete is set on the intelligent control box 55 as well as the number of maintenance times. When the set arrival time is reached, the water pump 56 will be automatically controlled to start spraying, and the first reducer 47 is started at the same time to make the spraying device move along the fixed groove rail 42 and the folding groove rail 43 to perform regular maintenance operations on the cap beam concrete.

[0072] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A construction method for a large cantilever prestressed cast-in-place cap beam system of a steel pipe Bailey beam support in water-rich soft soil, characterized in that: The following steps are involved: Construction of the support system: a cap beam support system including a support foundation (7), columns (2), supporting beams (3), Bailey frame load-bearing structures (4), buckle supports (5), distribution beams (8) and supporting formwork (9) is set up. The support foundation (7) is treated differently according to different position conditions. The columns (2) are installed by setting a connection method and a top support structure is set up. After the installation is completed, the support bearing capacity test and preloading are carried out. The preloading process includes loading, monitoring and qualification determination. Cap beam frame processing: Make an integral tyre frame of the cap beam frame with a specific structure, use the tyre frame to make and tie the cap beam reinforcement frame, use a movable precise positioning slot to assist the precise placement of the reinforcement, and set specific buffering and fixing measures; Formwork and hoisting operation: Use a cap beam standardized formwork with a specific structure, and hoist the formwork through a hoisting device with a specific structure and function. The formwork connection and tensioning settings meet specific requirements; Construction of tensioning operation platform: constructing a prestressed cap beam tensioning hanging operation platform including a main beam (37), a frame structure (38), a bottom platform (39) and anchor holes (40), performing corresponding welding, connection and reinforcement operations, and setting up tensioning operation auxiliary structures and safety protection facilities; Maintenance operation platform setting: A movable spray intelligent maintenance cap beam operation platform is adopted, including a water tank (41), a spray device and a movable track structure. The timed spray maintenance of the cap beam concrete is realized through specific moving, supporting, driving and controlling devices. The platform has humidity monitoring and automatic control spraying functions.

2. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 1 is characterized by: In the construction of the support system, 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 gravel backfill layer around the pedestal, a concrete enlarged foundation with a size of 2.0m×2.0m is poured on the gravel backfill layer.

3. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 1 is characterized by: In the construction of the support system, the column (2) is composed of a standard section and an adjustment section (12). The standard sections and the adjustment sections (12) are connected by flanges. The top supporting steel plate (13) is circular and 10 mm thick. Its diameter is 6 cm larger than the diameter of the spiral pipe. The edge protection structure of the construction platform adopts an assembled protective net guardrail. The bottom of the guardrail is a platform steel plate (14). The outer edge of the platform steel plate (14) is installed or welded with a protective mesh with an angle iron frame.

4. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 1 is characterized by: In the processing of the cap beam frame, the main beam (15) of the overall binding frame of the cap beam frame is spliced ​​by two 20a channel steels, and is provided with a plurality of limit holes, and the limit holes are plugged with steel pipes and cooperate with the limit holes to form stirrup limit (18); the support beam (16) is connected to the main beam (15) and arranged along the support beam (16), including an upper support beam (19), a middle support beam (20) and a bottom support beam (21), the upper support beam (19) is connected to the top of the main beam (15) and is made of I-beam, and a triangular support is set at the overlap with the main beam (15) and is fully welded, and the function is to support the upper main reinforcement of the large cap beam reinforcement frame; the middle support beam (20) is made of 8×8cm square steel pipe, and a triangular support is set at the overlap with the main beam (15) and is fully welded. The bottom supporting beam (21) is connected to the bottom of the main beam (15) and is made of I-beams. It is fully welded to the bottom longitudinal beam (19) and is used to support the lower main reinforcement of the cap beam reinforcement skeleton. The stirrup limiter (18) is made of small steel pipes welded to the main beam (15), and round steel is inserted into the limit hole, and is arranged between the supporting beams (16). The bottom longitudinal beam (19) is equipped with a bottom longitudinal beam connecting rod (22), and the bottom longitudinal beam (19) is respectively connected to the two ends of the bottom longitudinal beam connecting rod (22). The main beam (15) is connected to one of the bottom longitudinal beams (19). The bottom longitudinal beam connecting rod (22) is made of I-beams and is fully welded to the two parallel bottom longitudinal beams (19).

5. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 4 is characterized by: In the processing of the cap beam skeleton, the movable precise positioning slot includes a transverse bottom plate steel bar positioning slot (23), which is made of two symmetrical angle steels; a longitudinal bottom plate steel bar positioning slot (24), which is made of a flat plate with a plurality of grooves, and bolt fixing plates (25) are welded on both sides of the longitudinal bottom plate steel bar positioning slot (24); a movable pulley (26), which is fixed to the lower part of the transverse bottom plate steel bar positioning slot (23) by bolts; a U-shaped support frame (27), which includes a U-shaped steel bar (29) and a rubber cushion sleeve (28), and the rubber cushion sleeve (28) is installed at the lower part of the U-shaped steel bar (29), and the height of the U-shaped frame is calculated according to the construction drawings. The steel bars of the U-shaped support frame (27) are processed and made of the leftover materials generated by the steel bar construction at the construction site, and in the cutting process; After the cap beam reinforcement skeleton is tied, a buffer wood square is placed above the beam mouth template perpendicular to the estimated direction of the beam reinforcement near the U-shaped support frame (27) before sinking the beam, and the height is higher than the height of the vertical reinforcement of the U-shaped support frame (27). After the beam is sunk, the entire beam body is placed on the buffer square bar. Before fixing the U-shaped support frame (27), a suitable rubber pad sleeve model is selected to firmly cover the mouth of the U-shaped support frame (27). The height of the buffer square bar should be slightly higher than the height of the U-shaped support frame (27). After the U-shaped support frame (27) passes through the bottom of the upper longitudinal reinforcement of the beam, its port is vertically downward, and the intersection of the upper longitudinal reinforcement of the upper beam is fixed by binding. After the U-shaped support frame (27) is fixed, the buffer wood square is taken out.

6. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 1 is characterized by: During the template and hoisting operation, the cap beam forming template includes an outer template (37), a bottom template (30), a side template (31), and a connecting section (32). The side template (31) and the bottom template (30) are connected by bolts, and the gaps are sealed with rubber plugs. The template segment joints of the side template (31) are all connected by bolts, and the gaps are sealed with rubber plugs. Two precision-rolled threaded steel bars are set at the bottom and top of the template for tensioning. The cap beam forming templates are all made of steel templates. The steel template panel is made of 8mm thick steel plate, the rib plate is 12mm, the outer side of the panel is made of two-channel steel with horizontal ribs, and the vertical rib steel is made of double-jointed channel steel 18, with a maximum spacing of 90-100cm. The template bolting surface is bolted, and the template segment joints are all bolted, and the gaps are filled with rubber pads. The lifting device includes a balance beam (33) and a lifting plate (34), the balancing beam (33) is in the shape of a rectangular parallelepiped, both ends of the balancing beam (33) are slidably connected with a telescopic block (331), the telescopic block (331) slides relatively along the length direction of the balancing beam (33), a telescopic groove (35) for the telescopic block (331) to slide is provided through the balancing beam (33), the telescopic block (331) is fitted with the inner wall of the telescopic groove (35), a clamping piece is provided at one end of the telescopic block (331) away from the balancing beam (33), the clamping piece is a clamp (36) which can clamp the steel bars on the steel cage, the lifting device also includes a lifting plate, the middle part of the lifting plate is hollowed out and equipped with a hook, the lifting device also includes a flap, a fixing block, and an oil filling hole, the flap is installed on the fixing block, and an adjusting screw is installed under the flap to adjust the travel of the telescopic block.

7. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 1 is characterized by: In the construction of the tensioning operation platform, the crossbeam of the prestressed cap beam tensioning hanging operation platform is welded to the frame structure (38) composed of channel steel, the crossbeam system and the main beam (37) are welded by triangular diagonal rods, the intersection position is reinforced by a stiffening plate (41), the crossbeam and the platform frame structure (38) are connected by a crossbeam connecting tie rod, a steel pipe (42) is arranged above the crossbeam to facilitate the hanging of the jack during the tensioning operation, the bottom platform frame (39) is formed by welding the channel steel, and the square wood ( 43) and the template are laid on the platform frame, and a bottom platform skirting board (44) is arranged above the bottom platform (39). A safety net (45) is arranged around the entire bottom platform (39). After the frame structure (38) is assembled, the cross bar is locked and the expansion screws are driven through the anchor holes (40) for anchoring. The wire rope passes through the reserved hole for the circular wire rope at the end of the main beam (37) and surrounds the cross section of the cap beam to form a clamp state. The end of the circular wire rope is connected to a hand winch, and the main beam and the cap beam are fixed by tightening the hand winch.

8. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 7 is characterized by: In the maintenance operation platform setting, a pair of mutually spaced fixed groove rails (42) of the movable spray intelligent maintenance cap beam operation platform are arranged along the longitudinal length direction of the cap beam concrete, one end of each fixed groove rail (42) is hinged with a folding groove rail (43) horizontally connected with it and foldable upward, and the lower side of the hinged end of each fixed groove rail (42) is respectively provided with a support leg (44) that can be placed on the cap beam concrete, a water tank (41) is arranged between the pair of fixed groove rails (42), a pair of sliding devices are relatively arranged on the pair of fixed groove rails (42), and a spraying device is arranged on the lower side of each sliding device, and the pair of sliding devices respectively drive the spraying device to move back and forth along the pair of fixed groove rails (42) and the pair of folding groove rails (43) to drive the spraying device to spray the cap beam concrete; The sliding device comprises a rack (45) arranged on the outer side of a pair of fixed groove rails (42) and a folded groove rail (43), a fixed plate seat (46) is arranged at intervals at the lower end of each fixed groove rail (42), the lateral outer end of each fixed plate seat (46) extends out of the end face of the rack (45) on the same side, a first reducer (47) is arranged on the lateral outer end plate face of each fixed plate seat (46), and driving gears (48) meshing with the rack (45) on the same side are respectively arranged on both sides of the first reducer (47). ), each driving gear (48) is connected to a transmission shaft (49) of coaxial transmission, each transmission shaft (49) extends downward from the fixed plate seat (46) and is connected to a transmission sprocket of coaxial transmission, the first reducer (47) is meshedly connected to the transmission sprocket through a driving sprocket (50), a roller mechanism that slides along its axial direction is embedded in the fixed groove rail (42) or the folding groove rail (43), and a fixed suspension rod ( 51), the end extending from the fixed suspension rod (51) is connected to the transverse inner end plate surface of the fixed plate seat (46), and the lower side of the pair of fixed plate seats (46) is connected to the spray device; the pair of fixed groove rails (42) and the pair of folding groove rails (43) have the same structure, the cross section of the fixed groove rails (42) is a mouth-shaped structure with a notch at the bottom, and the notch runs through the longitudinal direction of the fixed groove rails (42), and the ends of the pair of fixed groove rails (42) and the pair of folding groove rails (43) are hinged and folded to facilitate the maintenance of the device. The folding groove rail (43) moves between adjacent cap beam concretes. When moving, the folding groove rail (43) forms a folded state along the fixed groove rail (42) to reduce the length of the intelligent maintenance device and then moves. After the movement is completed, the folding groove rail (43) is rotated to open and connected to the fixed groove rail (42) as a whole. The fixed groove rail (42), the folding groove rail (43) and the four supporting legs (44) are longitudinally supported on the cap beam concrete. The supporting length of the four supporting legs (44) can make the spraying device and the sliding device separate from the upper surface of the cap beam concrete.

9. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to claim 8 is characterized by: The spraying device comprises a spraying water pipe connected to the lower ends of a pair of fixed plate seats (46), a nozzle (52) being arranged on the spraying water pipe, and the spraying water pipe is arranged around the lower ends of the two fixed plate seats (46) in sequence to cover the lateral surface of the cap beam concrete; the movable spraying intelligent maintenance cap beam operation platform also comprises a humidity sensor, and the humidity sensor is connected to the intelligent control box (55), and when the humidity of the cap beam concrete is lower than the set value, the intelligent control box (55) automatically controls to start the water pump (56) for spraying.

10. The construction method of the water-rich soft soil steel pipe Bailey beam support large cantilever prestressed cast-in-place cap beam system according to any one of claims 1 to 9, characterized in that: When the movable spraying intelligent maintenance cap beam operation platform is used, the entire device is hoisted and placed at the top position of the bridge cap beam concrete through the lifting ring (53), and the second reducer (54) is started to rotate and open the folding groove rail (43) to align and engage with the fixed groove rail (42), so that the support leg (44) is actually supported on the cap beam concrete, and the water inlet pipe of the water tank (41) is connected. The maintenance time of the cap beam concrete is set on the intelligent control box (55) to start and close and the number of maintenance times. When the set time is reached, the water pump (56) will be automatically controlled to start spraying. At the same time, the first reducer (47) is started at the same time to make the spraying device move along the fixed groove rail (42) and the folding groove rail (43) to perform regular maintenance operations on the cap beam concrete.

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