Method for manufacturing simply-supported box girder of high-speed rail

Abstract

The invention discloses a high-speed rail simply-supported box girder manufacturing method, and belongs to the technical field of high-speed rail box manufacturing. The method specifically comprises the steps that (1) box girder reinforcing steel bars are bound on a reinforcing steel bar binding mould to form a box girder reinforcing steel bar cage; (2) quality inspection is conducted on the box girder steel fine cage according to design requirements; (3) after quality inspection is qualified, the bound box girder reinforcement cage is conveyed into a box girder mold and adjusted to a proper position; (4) concrete conforming to the mark number is poured into the box girder mold to complete pouring; (5) after the concrete reaches the set strength, a leveling machine is installed, and after the concrete with the set thickness is laid, the leveling machine is operated to conduct leveling; by means of the box girder leveling method, leveling of the box girder can be rapidly achieved, the leveling effect is good, errors are small, time and labor are saved, and concrete lines are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of high - speed railway box girder manufacturing, and relates to a manufacturing method for simply - supported high - speed railway box girders. Background Art

[0002] As an important component for supporting high - speed railways, after the precast box girder of the high - speed railway is completed, a bridge erection machine is used to erect the precast box girder on the bridge. After a section of the box girder is poured, the upper surface needs to be leveled to meet the design requirements. The conventional method is to lay a certain thickness of concrete and level it manually. This method has problems such as insufficient flatness of the corresponding plane, large errors, and is time - consuming and labor - intensive when carried out manually. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a manufacturing method for simply - supported high - speed railway box girders, which can quickly level the box girder, has good leveling effect, small errors, saves time and labor, and avoids the generation of concrete lines.

[0004] The technical solution adopted by the present invention is as follows: A manufacturing method for simply - supported high - speed railway box girders, the method comprising the following steps: 1) Binding of the box girder steel reinforcement cage: According to the design requirements, bind the box girder steel bars on a steel bar binding jig to form a box girder steel reinforcement cage, and insert a rubber tube through the pre - stretching holes; 2) Quality inspection: Conduct quality inspection on the box girder steel reinforcement cage according to the design requirements; 3) Hoisting: After passing the quality inspection, transport the bound box girder steel reinforcement cage to the box girder mold and adjust it to the appropriate position; 4) Pouring: According to the design requirements, pour concrete of the corresponding grade into the box girder mold to complete the pouring; 5) Leveling: After the concrete reaches the set strength, install a leveling machine, lay a set thickness of concrete, and then operate the leveling machine for leveling; 6) Top surface curing: Conduct top surface curing after leveling; 7) Storage curing: After reaching the set strength, hoist it to the storage pier for storage curing.

[0005] Furthermore, during the binding process of the upper - layer transverse steel bars at the bottom plate of the above - mentioned box girder steel bars, a positioning device for the upper - layer transverse steel bars at the bottom plate of the box girder is used for positioning and then binding. The positioning device for the upper - layer transverse steel bars at the bottom plate of the box girder includes a strip - shaped positioning beam one, positioning clamps, and a positioning frame one. One end of the positioning beam one is fixedly connected with the positioning frame one, and the positioning frame one is used for detachably fixing and connecting to a positioning reference steel bar one. A plurality of positioning clamps are used, which are movably connected to the positioning beam one and fastened with fasteners. The plurality of positioning clamps can be clamped into multiple longitudinally arranged transverse steel bars to be positioned and positioned.

[0006] Further, the above-mentioned positioning frame one includes a fixing clip one, a connecting rod one, a pushing rod one, a connecting pipe one and a screw rod. The connecting pipe one is fixedly connected to one end of the positioning beam one. The fixing clip one is in a lying V-shaped structure and there are two of them. The upper ends are symmetrically hinged at the U-shaped notch parts on both sides of the lower end of the connecting pipe one, and the groove parts of the two fixing clips one are arranged oppositely to form a positioning steel bar clamping part. There are two pushing arms one which are integrally formed with and bent and extended from the upper ends of the two fixing clips one. The upper ends of the two pushing arms one are respectively hinged to one ends of the two connecting rods one. The other ends of the two connecting rods one are symmetrically hinged to both ends of the horizontal pushing rod one. The pushing rod one horizontally and movably passes through the vertical strip-shaped through hole one arranged on the connecting pipe one. The lower end of the screw rod is rotatably connected to the middle of the pushing rod one and is built into the connecting pipe one. The upper end of the screw rod is screwed to the adjusting nut, and the adjusting nut is fixedly connected to the upper end of the connecting pipe one.

[0007] Further, during the quality inspection of the steel cage of the box girder, the quality inspection of the upper-layer transverse steel bars on the bottom slab of the box girder is carried out by using a positioning error detection device for the upper-layer transverse steel bars. The positioning error detection device for the upper-layer transverse steel bars includes a strip-shaped positioning beam two, an error detection clamp and a positioning frame two. One end of the positioning beam two is fixedly connected with a positioning frame two. The positioning frame two is used for detachably and fixedly connecting to the positioning reference steel bar two. There are multiple error detection clamps, which are movably sleeved on the positioning beam two. Springs are symmetrically connected to both sides of each error detection clamp, and the other ends of the springs are fixedly connected to the connecting columns. The connecting columns are fixedly connected to the positioning beam two. Multiple error detection clamps can be clamped into multiple longitudinally arranged transverse steel bars to be detected. Scale lines two are arranged on the positioning beam two.

[0008] Further, the above-mentioned positioning frame two includes a fixing clip two, a connecting rod two, a pushing rod two, a connecting pipe two and a tension rod. The connecting pipe two is fixedly connected to one end of the positioning beam two. The fixing clip two is in a lying V-shaped structure and there are two of them. The upper ends are symmetrically hinged at the U-shaped notch two on both sides of the lower end of the connecting pipe two, and the groove parts of the two fixing clips two are arranged oppositely to form a positioning steel bar clamping part. There are two pushing arms two which are integrally formed with and bent and extended from the upper ends of the two fixing clips two. The upper ends of the two pushing arms two are respectively hinged to one ends of the two connecting rods two. The other ends of the two connecting rods two are symmetrically hinged to both ends of the horizontal pushing rod two. The pushing rod two horizontally and movably passes through the vertical strip-shaped through hole two arranged on the connecting pipe two. A tension spring abuts against the middle part of the bottom side of the pushing rod two. The tension spring is located inside the connecting pipe two and the lower end abuts against the spring fixing plate. The spring fixing plate is fixedly connected inside the connecting pipe two and is located above the U-shaped notch two. The lower end of the tension rod is fixedly connected to the middle of the pushing rod two and is built into the connecting pipe two. The upper end of the tension rod movably passes through the guide sleeve, and the guide sleeve is fixedly connected to the upper end of the connecting pipe two.

[0009] Further, the above leveling machine includes a frame, a traveling mechanism, an auger roller, a first slurry lifting roller, and a second slurry lifting roller. The traveling mechanisms are installed at both ends of the frame and are placed on two tracks arranged on both sides of the box girder. The auger roller, the first slurry lifting roller, and the second slurry lifting roller are arranged in sequence from front to back at the bottom of the frame and are respectively connected to a first transmission device, a second transmission device, and a third transmission device to drive their rotation. The first transmission device, the second transmission device, and the third transmission device are installed on the frame. The lowest points of the auger roller, the first slurry lifting roller, and the second slurry lifting roller are 1-2 cm lower than the height of the concrete to be leveled.

[0010] Further, symmetric annular concave conical surfaces are provided in the middle of the first slurry lifting roller and the second slurry lifting roller, and the slope of the annular concave conical surface is 2%. Annular convex conical surfaces are provided at both ends. The inner end of the annular convex conical surface is small and the outer end is large, and the slope is 3%. The length of the auger roller is 7 m, and the lengths of the first slurry lifting roller and the second slurry lifting roller are 8.6 m. The lengths of the middle annular concave conical surfaces of the first slurry lifting roller and the second slurry lifting roller are both 2 m, the length of the straight section is 2.7 m, and the lengths of the annular convex conical surfaces at both ends are 0.5 m.

[0011] Further, the above traveling mechanism includes a traveling frame and traveling wheels. The traveling wheels are rotatably connected to the bottom of the traveling frame. The traveling wheels are connected to a power mechanism for driving their travel. The traveling wheel frame is connected to the frame through a height adjusting device. The adjusting device includes a portal frame, a chute, and a lifting adjusting screw. The lower end of the portal frame is fixedly connected to the traveling frame through a flange plate. The two side columns of the portal frame are movably clamped into two chutes and are fixedly connected to the frame through bolt 1. Vertical strip-shaped through holes are provided in the columns at the position of bolt 1. Each chute is fixedly connected to the frame back to back by two angle steels through bolt 2. Horizontal strip-shaped through holes are provided in the frame at the positions of bolt 1 and bolt 2. Two lifting adjusting screws are used. Each lifting adjusting screw is rotatably connected to the top beam of the portal frame through a bearing block 3 near the top and is spirally connected to the frame through a nut at the lower part.

[0012] Further, two auger rollers are adopted and are rotatably connected side by side along the same horizontal axis to a lifting bearing block 1 provided at the bottom of the frame. The lifting bearing block 1 is fixedly connected to the frame. Each auger roller is connected to a first transmission device and the first transmission device is installed at the outer end. Reverse spiral feeding spiral blades are provided on the two auger rollers. The lifting bearing block 1 includes a portal frame 1, a sliding square frame 1, a bearing block 1, and a lifting screw 1. The bearing block 1 is fixedly connected to the bottom of the sliding square frame 1 in an inverted manner. The sliding square frame 1 is slidably placed in the chutes on both sides of the portal frame 1. The portal frame 1 is fixedly connected to the frame. The lifting screw 1 is spirally connected to the top cross beam of the sliding square frame 1. The lifting screw 1 is rotatably connected to the center of the top horizontal cross beam of the portal frame 1 through a support bearing block 1 near the upper end and a rotating handle 1 is fixedly connected to the extended end of this end.

[0013] Furthermore, the top surface curing is carried out by using a top surface water storage device. The top surface water storage device includes two groups of first steel bar rows and second steel bar rows respectively arranged at positions close to the edges on the top of the precast box girder. The first steel bar row is arranged along the length direction of the precast box girder, and the second steel bar row is arranged along the width direction of the precast box girder; the rectangular area enclosed by the first steel bar row and the second steel bar row is the pouring area; a strip-shaped water bag filled with water is arranged on the top of the precast box girder; the strip-shaped water bag is made of a deformable flexible material; the strip-shaped water bag forms a rectangular ring around the pouring area; two opposite sides of the rectangular ring are respectively arranged outside the first steel bar row, and the other two opposite sides are respectively set against the second steel bar row.

[0014] The beneficial effects of the present invention: Compared with the prior art, the effects of the present invention are as follows: 1) In the leveling step of the manufacturing method, a leveling machine is used, which can quickly level the box girder, with good leveling effect, small error, time-saving and labor-saving, and can avoid the generation of concrete lines; 2) One end of the positioning beam is fixed to the positioning reference steel bar on the bottom plate of the box girder (when starting, the rotating door head steel bar is folded into the upper layer of steel bars bent by the bottom plate, and then the last positioned transverse steel bar after each positioning is used as the positioning reference steel bar), and is fixed on the first positioning beam at a set spacing through a plurality of positioning clamps. The longitudinal limit of the transverse steel bar (the transverse steel bar to be positioned) is carried out according to the positioning clamps. After the limit, the transverse steel bar is tied, which can quickly realize the positioning of the transverse steel bar, greatly improve the binding efficiency of the transverse steel bar and the positioning accuracy after the transverse steel bar is tied. The positioning clamp is movably sleeved on the first positioning beam and fixed by a fastener, and can be adjusted according to the needs of the steel bar binding position, with a wide application range, greatly reducing the equipment cost, simple equipment operation and convenient and fast adjustment; 3) The driving and locking mechanism composed of the first push rod, the first connecting rod, the first connecting pipe and the screw rod is used to drive the V-shaped first fixing clamp to clamp and fix the positioning reference steel bar to realize the reference fixing, with reliable positioning, convenient operation, and can adapt to different steel bar diameters for clamping, with a wide application range and low cost. Moreover, the first push rod moves directionally in the vertical strip-shaped through hole, with good stability; 4) Fix one end of the second positioning beam to the positioning reference steel bars on the bottom slab of the box girder (select the header bars folded into the upper layer of steel bars bent on the bottom slab at the starting position, and then select the last transverse steel bar after each inspection as the positioning reference steel bar after adjusting the position). Obtain the detection error of the transverse steel bar positioning according to the data of the relative movement of multiple error detection fixtures on the second positioning beam relative to the theoretical value. It can quickly realize the detection of the positioning error of the transverse steel bar, greatly improve the detection efficiency and accuracy of the transverse steel bar. The error detection fixture is movably sleeved on the positioning beam and connected by springs that can move on both sides. It can be adjusted according to the need for error detection of the steel bar binding position, with a wide range of applications. The cost of the detection equipment is greatly reduced, the equipment operation is simple, the adjustment is convenient and fast, and scale lines are set, which can quickly realize the direct reading of the position of the error detection fixture, improve the position adjustment accuracy of the error detection fixture and the detection efficiency; 5) The driving and locking mechanism composed of the second push rod, the second connecting rod, the second connecting pipe, the tension spring and the tension rod is used to drive the V-shaped second fixed clamp to clamp and fix the positioning reference steel bar to achieve reference fixation. The positioning is reliable, the operation is convenient, the error detection is accurate, and it can adapt to the clamping of different steel bar diameters, with a wide range of applications and low cost. Moreover, the second push rod moves directionally in the vertical strip-shaped through hole, with good stability; 6) Use the auger roller for stirring, feeding and spreading, the first screed roller for rough leveling, and the third screed roller for fine leveling, which can greatly improve the leveling effect, avoid the appearance of traditional concrete ridges, and save time and effort without manual assistance; 7) The middle annular concave of the first screed roller and the second screed roller is convenient for extruding the middle concrete to both sides, making it more dense. The annular convex conical surfaces at both ends are convenient for compressing and stabilizing the leveling area, and also avoid the poor leveling effect on the side caused by excessive outflow of the slurry during the leveling process, and can play a certain role in converging. Set the length of the auger roller to meet the coverage range and feeding requirements of the stirred concrete. Set the lengths of each section of the first screed roller and the second screed roller to meet the requirements of the leveling area. 8) By rotating the lifting and adjusting screw, the lifting and adjusting screw rotates around the fixed point of the third bearing seat. The nut screwed to the lower end of the lifting and adjusting screw is fixed to the frame. After the lifting and adjusting screw rotates, it drives the nut to move up and down, thereby realizing the relative up and down movement of the frame and the portal frame. After the adjustment is in place, it is locked by the first bolt, thereby realizing the height adjustment of the frame and obtaining a large-size adjustment of the leveling height. The adjustment is convenient and fast, easy to adjust, and after adjustment, it also avoids the interference between the frame and the embedded steel bars on both sides of the surface to be leveled. Moreover, it can also be adjusted in width along the horizontal direction, and can adapt to the matching of different track widths directly, with simple adjustment; 9) The feeding screw blade can stir and feed the concrete, driving the middle material to both sides, making the thickness covered during leveling uniform, which is more conducive to leveling. Using two mixing auger rollers can reduce the weight of the support points, and the single mixing power performance is reduced, making it more conducive to controlling the mixing and feeding. The use of lifting bearing seats facilitates fine-tuning the height of the mixing auger rollers, avoiding inconsistent installation levels of the tracks of the walking mechanism, thus adapting to different application scenarios, reducing costs, lowering installation requirements, and improving installation efficiency; 10) Through the structure of using strip water bags as the moisture conservation and curing cofferdams on the top of precast box girders, the flexible strip water bags are used to replace traditional rigid cofferdam materials, greatly simplifying the installation process and reducing the labor cost of erection. Description of the Drawings

[0015] Figure 1 It is a schematic flow chart of the manufacturing method of simply supported box girders; Figure 2 It is a schematic structural diagram of the positioning device for the upper-layer transverse reinforcement of the box girder floor; Figure 3 It is a schematic structural diagram of the installation location of the positioning clamp; Figure 4 It is a schematic structural diagram of the installation location of the first positioning frame; Figure 5 It is a schematic structural diagram of the layout of the transverse reinforcement at the end of the box girder reinforcement; Figure 6 It is a front view schematic structural diagram of the door head reinforcement; Figure 7 It is a schematic structural diagram of the detection device for the upper-layer transverse reinforcement of the box girder floor; Figure 8 It is a schematic structural diagram of the installation location of the error detection clamp; Figure 9 It is a schematic structural diagram of the installation location of the second positioning frame; Figure 10 It is a schematic structural diagram of the spring mounting plate; Figure 11 It is a schematic sectional structural diagram of the installation location of the error detection clamp; Figure 12 It is a schematic sectional structural diagram of the installation location of the error detection clamp; Figure 13 It is a schematic structural diagram of the layout of the transverse reinforcement at the end of the box girder reinforcement; Figure 14 It is a front view schematic structural diagram of the door head reinforcement; Figure 15 It is a rear view schematic structural diagram of the high-speed rail box girder leveling machine; Figure 16 It is a schematic structural diagram of the layout of the mixing auger roller, the first slurry lifting roller and the second slurry lifting roller; Figure 17Schematic diagram of the lifting mechanism at the right end of the high-speed rail box girder leveling machine; Figure 18 Front view structural schematic diagram of the lifting mechanism; Figure 19 Right view structural schematic diagram of the high-speed rail box girder leveling machine (removing the power device of the lifting mechanism); Figure 20 Front view layout structural schematic diagram of the right-end power mechanism of the high-speed rail box girder leveling machine; Figure 21 Schematic diagram of the first lifting bearing seat; Figure 22 Schematic diagram of the second lifting bearing seat; Figure 23 Schematic diagram of the structure of the top water storage device; Figure 24 Schematic diagram of the overlapping position of the strip water bags end to end; Figure 25 For Figure 24 Cross-sectional schematic diagram at the position of the auxiliary water bag in; Figure 26 Planar structural schematic diagram of the modular curing device for the side end face of the precast box girder; Figure 27 Planar schematic diagram of a single outer frame; Figure 28 Three-dimensional structural disassembly and explosion schematic diagram of a single unit outer frame and the corresponding waterproof cloth and sponge pad. Specific implementation mode

[0016] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0017] Embodiment 1: As Figures 1 to 28 shown, a method for manufacturing a simply supported high-speed rail box girder includes the following steps: 1) Binding of the box girder steel reinforcement cage: According to the design requirements, bind the box girder steel bars on the steel bar binding jig to form a box girder steel reinforcement cage, and insert a rubber tube through the pre-stretching hole; 2) Quality inspection: Inspect the box girder steel reinforcement cage according to the design requirements; 3) Hoisting: After passing the quality inspection, transport the bound box girder steel reinforcement cage to the box girder mold and adjust it to the appropriate position; 4) Pouring: According to the design requirements, pour concrete of the appropriate grade into the box girder mold to complete the pouring; 5) Leveling: After the concrete reaches the set strength, install the leveling machine, lay concrete of the set thickness, and then operate the leveling machine for leveling; 6) Top surface curing: Carry out top surface curing after leveling; 7) Storage and curing: After reaching the set strength, it is hoisted to the storage pier for storage and curing until the set strength is reached, and then the rubber tube is pulled out; 8) Installation of pre-tensioned steel strands: The steel strands are inserted into the pre-tensioning holes, and both ends are connected by steel anchors and abutted against the steel anchor seats (precast). A hydraulic steel strand tensioning mechanism is used for pre-tensioning until the set value is reached and then stopped; 9) The end face and its grooves of the box girder are sealed with concrete; 10) After sealing and reaching the set strength, a waterproof layer is painted.

[0018] For the longitudinal positioning of the upper-layer transverse steel bars at the bottom plate of the box girder, a caliper is usually used for measurement, and then it is manually moved to the set position for binding. This method is time-consuming and laborious, and due to the bending and stress of the steel bars, there is a possibility of displacement, and the positioning accuracy is difficult to guarantee. Therefore, during the binding of the upper-layer transverse steel bars at the bottom plate of the box girder, a positioning device for the upper-layer transverse steel bars at the bottom plate of the box girder is used for positioning and then binding. As Figures 2 - 6 shown, the positioning device for the upper-layer steel bars at the bottom plate of the box girder includes a strip-shaped positioning beam 101, positioning clamps 102 and a positioning frame 103. One end of the positioning beam 101 is fixedly connected with a positioning frame 103, and the positioning frame 103 is used for detachably fixing and connecting to the positioning reference steel bar 104. Multiple positioning clamps 102 are used, which are movably connected to the positioning beam 101 and fastened by fasteners 105. Multiple positioning clamps 102 can be clamped into multiple longitudinally arranged transverse steel bars 106 to be positioned and positioned. The positioning beam 101 adopts a square tube structure of aluminum profile, and the fastener 105 adopts a set screw. A butterfly part is arranged at the top of the set screw to facilitate rotating the set screw to fix the positioning clamp on the positioning beam. The positioning frame is fixedly connected to the positioning reference steel bar 104, and multiple positioning clamps face multiple steel bars 106 to be positioned and keep close contact with them, realizing the positioning of the transverse steel bars to be positioned (the longitudinal steel bars at the bottom plate in the box girder length direction are through steel bars, arranged in the width direction, which is convenient for positioning, while the transverse steel bars are arranged at longitudinal intervals and are difficult to accurately position). After positioning, the transverse steel bars are bound.

[0019] Fix one end of the positioning beam to the positioning reference steel bar on the bottom plate of the box girder (when starting, the rotating head steel bar is folded into the upper-layer steel bar at the bottom plate, and then the last positioned transverse steel bar after each positioning is used as the positioning reference steel bar), and fix it on the positioning beam at a set interval through multiple positioning clamps. According to the positioning clamps, the longitudinal limit of the transverse steel bars (transverse steel bars to be positioned) is carried out. After limiting, the transverse steel bars are bound, which can quickly realize the positioning of the transverse steel bars, greatly improve the binding efficiency of the transverse steel bars and the positioning accuracy after binding. The positioning clamps are movably sleeved on the positioning beam and fixed by fasteners, and can be adjusted according to the needs of the steel bar binding position, with a wide application range, greatly reducing the equipment cost, simple equipment operation and convenient and fast adjustment.

[0020] Specifically, the positioning fixture 102 includes a first movable sleeve 10201 and an inverted V-shaped card slot 10202. The first movable sleeve 10201 adopts a square sleeve structure and is sleeved on the first positioning beam 101 with a square cross-section. The upper end of the V-shaped card slot 10202 is fixedly connected to the middle of the bottom side of the first movable sleeve 10201, and the width direction of the slot part of the V-shaped card slot 10202 is arranged along the length direction of the first positioning beam 101. With the structure of the V-shaped card slot 1 and the square movable sleeve 1, the sleeving is convenient, the operation is simple, the positioning is accurate in cooperation with the square positioning beam, and the V-shaped structure can adapt to the positioning of different steel bar diameters. In order to quickly install the positioning fixture, a first scale line 10101 is provided on the first positioning beam 101. By setting the scale line, the position of the positioning fixture can be quickly located, and the adjustment efficiency and positioning accuracy can be improved.

[0021] Specifically, a first threaded column 10203 is provided at the upper end of the V-shaped card slot 10202. The first threaded column 10203 is screwed to the center of the bottom of the first movable sleeve 10201 and locked with a first nut 10204. The connection with the first threaded column is convenient for manufacturing and installation, and is locked with the first nut, which can prevent the V-shaped card slot from skewing due to the force on the V-shaped card slot after the stud connection, and improve the reliability of the connection of the first stud.

[0022] Specifically, an installation through hole 10103 is provided in the middle of the top of the first positioning beam 101, and a first level 10102 is installed in the installation through hole 10103. The top surface of the first level 10102 is not higher than the top of the first positioning beam 101. By setting the first level, it is convenient to bind the steel bars after the first positioning beam is positioned horizontally, making the positioning accuracy of the steel bars higher.

[0023] Specifically, the above-mentioned positioning frame 103 includes a first fixed clamp 10301, a first connecting rod 10302, a first pushing rod 10303, a first connecting pipe 10304 and a screw 10305. The first connecting pipe 10304 is fixedly connected to one end of the first positioning beam 101. The first fixed clamp 10301 is in a lying V-shaped structure and there are two of them. The upper ends are symmetrically hinged at the U-shaped notches 10306 on both sides of the lower end of the first connecting pipe 10304, and the groove parts of the two first fixed clamps 10301 are arranged oppositely to form a positioning steel bar clamping part. There are two pushing arms 10307 integrally formed and bent and extended at the upper ends of the two first fixed clamps 10301. The upper ends of the two pushing arms 10307 are respectively hinged to one ends of the two first connecting rods 10302. The other ends of the two first connecting rods 10302 are symmetrically hinged at both ends of the horizontal first pushing rod 10303. The first pushing rod 10303 horizontally moves through the vertical strip-shaped through hole 10308 provided on the first connecting pipe 10304. The lower end of the screw 10305 is rotatably connected to the middle of the first pushing rod 10303 and is built into the first connecting pipe 10304. The upper end of the screw 10305 is screwed to the adjusting nut 10309. The adjusting nut 10309 is fixedly connected to the upper end of the first connecting pipe 10304. The driving and locking mechanism composed of the first pushing rod, the first connecting rod, the first connecting pipe and the screw is used to drive the V-shaped first fixed clamp to clamp and fix the positioning reference steel bar, realizing reliable positioning, convenient operation, and being able to adapt to the clamping of different steel bar diameters, with a wide application range, low cost, and the pushing rod moves directionally in the vertical strip-shaped through hole, having good stability; the first connecting pipe 10304 is fixedly connected to the first positioning beam 101 by a threaded part and locked by a first locking nut 10310. A step 10311 is provided at the bottom of the connection part of the first positioning beam 101 and the first connecting pipe 10304, and the horizontal step surface is closed by a first baffle 10312. A first guide sleeve 10313 is fixedly connected to the upper end surface of the first pushing rod 10303. The first guide sleeve 10313 is sleeved outside the first connecting pipe 10304, which can achieve better guiding stability and avoid the problem of poor directional movement stability caused by the reduced rigidity of the opening of the connecting pipe.

[0024] Due to the bending of the steel bar, there will be a certain elastic force, which will easily cause the positioning fixture to be stressed, resulting in the positioning fixture being unable to fit precisely with the steel bar to be positioned. To solve this problem, an annular binding rubber belt 107 is provided at one end of the first positioning beam 101 far from the first positioning frame 103. After the annular binding rubber belt 107 elastically binds the longitudinal steel bar, it is hung on the hook 108. The hook 108 is fixedly connected to the end of the first positioning beam 101 near the annular binding rubber belt 107. After using the annular binding rubber belt to bind the steel bar, it can ensure that the positioning and clamping only fit the steel bar to be positioned, improving the positioning accuracy, eliminating the need for manual pressing of the positioning beam, and improving the efficiency of steel bar binding and the accuracy of binding and positioning.

[0025] The operation method of the positioning device for the upper-layer transverse steel bars of the box girder bottom slab includes the following steps: Step 1: Adjust the spacing of the positioning clamps on the positioning beam according to the longitudinal spacing dimension of the transverse steel bars to be positioned as designed. Step 2: Arrange two sets of positioning devices for the upper-layer transverse steel bars of the box girder bottom slab near the longitudinal middle of the box girder steel bars. Adjust the height of the positioning frames. First, fix the two positioning frames to the header bars at the end of the box girder on the top-layer steel bars of the bottom slab, and snap the positioning clamps onto the steel bars to be positioned. Step 3: After positioning, use a circular binding rubber belt to bind the end of the positioning beam to the longitudinal steel bars, so that the positioning beam remains horizontal and the positioning clamps are clamped tightly on each transverse steel bar to be positioned to complete the positioning of the transverse steel bars to be positioned. Step 4: Tie the positioned transverse steel bars. After tying is completed, loosen the circular binding rubber belt and remove the positioning frames. Step 5: Take the last positioned transverse steel bar in Step 4 as the positioning reference steel bar, and repeat the operations in Steps 1-4 to complete the tying of the next round of transverse steel bars. Step 6: Repeat the operation in Step 5 until all the transverse steel bars are positioned and tied.

[0026] The starting position at the end of the operation method of the positioning device uses the header bar integrated with the lower-layer steel bars at the end of the bottom slab as the starting position, and with the positioning of the positioning clamps, it can achieve the precise positioning of the transverse steel bars at the bottom slab position, and improve the tying efficiency, tying accuracy and tying quality. The positioning saves time and effort.

[0027] For the longitudinal position positioning of the upper-layer transverse steel bars of the box girder bottom slab, a caliper is usually used for measurement and then tying. After tying is completed, quality inspection personnel need to conduct quality inspection. When the quality inspection personnel measure the spacing of the transverse steel bars, they also use a caliper for measurement. First, use the header bar as the reference for measurement. If each one is measured relative to the reference steel bar, it will cause the limited length of the tape measure and cannot be measured. But using the middle steel bar as the reference for measurement will lead to the accumulation of errors and exceed the error range, and the measurement is inaccurate. During the quality inspection of the box girder steel cage for the upper-layer transverse steel bars of the box girder bottom slab, an upper-layer transverse steel bar positioning error detection device is used for detection, such as Figures 7 - 14As shown in the figure, the positioning error detection device for the upper-layer horizontal steel bars includes a strip-shaped positioning beam II 201, an error detection fixture 202, and a positioning frame II 203. One end of the positioning beam II 201 is fixedly connected to the positioning frame II 203, and the positioning frame II 203 is used for detachably fixing to the positioning reference steel bar II 204. A plurality of error detection fixtures 202 are movably sleeved on the positioning beam II 201. Springs 205 are symmetrically connected to both sides of each error detection fixture 202, and the other ends of the springs 205 are fixedly connected to the connecting column 210, and the connecting column 210 is fixedly connected to the positioning beam II 201. A plurality of error detection fixtures 202 can be inserted into multiple horizontally arranged steel bars to be detected 206, and a scale line II 20101 is provided on the positioning beam II 201.

[0028] Fix one end of the positioning beam to the positioning reference steel bar on the bottom plate of the box girder (select the upper-layer steel bar formed by folding the door head bar at the bottom plate at the starting position, and then select the last horizontal steel bar after each detection as the positioning reference steel bar after adjusting the position). Obtain the detection error of the horizontal steel bar positioning according to the data of the relative movement of the multiple error detection fixtures installed on the positioning beam relative to the theoretical value. It can quickly realize the detection of the horizontal steel bar positioning error, greatly improve the detection efficiency and accuracy of the horizontal steel bar. The error detection fixture is movably sleeved on the positioning beam and is connected by springs that can move on both sides, and can be adjusted according to the error detection needs of the steel bar binding position. It has a wide range of applications, greatly reduces the cost of the detection equipment, the equipment is simple to operate, and the adjustment is convenient and fast. The scale line is set, which can quickly realize the direct reading of the position of the error detection fixture, improve the position adjustment accuracy of the error detection fixture and the detection efficiency.

[0029] Specifically, the error detection fixture 202 includes a movable sleeve II 20201 and an inverted V-shaped card slot II 20202. The movable sleeve II 20201 adopts a square sleeve structure and is movably sleeved on the positioning beam II 201 with a square cross-section. The upper end of the V-shaped card slot II 20202 is fixedly connected to the middle part of the bottom side of the movable sleeve II 20201, and the width direction of the slot part of the V-shaped card slot II 20202 is arranged along the length direction of the positioning beam II 201. With the structure of the V-shaped card slot II and the square movable sleeve II, the sleeving is convenient and the operation is simple. The positioning error detection is accurate in cooperation with the square positioning beam II. The V-shaped structure can adapt to the positioning error detection of different diameters of horizontal steel bars. A scale line II 20101 is provided on the positioning beam II 201. Setting the scale line II can also quickly realize the rapid adjustment of the position of the error detection fixture and improve the adjustment efficiency of the error detection fixture.

[0030] Specifically, a second threaded post 20203 is provided at the upper end of the second V-shaped card slot 20202. The second threaded post 20203 is screwed to the center of the bottom of the second movable sleeve 20201 and locked by a second nut 20204. The connection by the second threaded post is convenient for manufacturing and installation, and the use of the second nut for locking can prevent the second V-shaped card slot from tilting due to the force on the second V-shaped card slot after the connection of the second threaded post, improving the connection reliability of the second threaded post.

[0031] Specifically, an installation through hole 20103 is provided in the middle side of the top of the second positioning beam 201. A second level 20102 is installed in the installation through hole 20103, and the top surface of the second level 20102 is not higher than the top of the second positioning beam 201. The setting of the level can facilitate the detection of the positioning error of the transverse steel bars after the second positioning beam is positioned horizontally, making the positioning error detection accuracy of the steel bars higher.

[0032] Specifically, a strip-shaped groove 211 is provided in the middle of the side surface of the second positioning beam 201 along the length direction. Uniformly spaced positioning holes 212 are provided in the strip-shaped groove 211. The connecting column 210 is a stepped column, and its small end can be inserted into the positioning holes 212. Spring connecting plates 201011 are provided in the middle of both sides of the movable sleeve 20201. The spring connecting plates 201011 are embedded in the strip-shaped groove 211. After the spring 205 connects the spring connecting plates 201011 and the connecting column 210, it is parallel to the positioning beam 201. Fine scale lines 213 are provided on the lower side of the strip-shaped groove 211. The arrangement of the spring structure in the strip-shaped groove 211 provides a larger installation space and is more convenient for installation. The plug-in method is used, making it easy to install and disassemble, and convenient and fast to change positions as needed. The setting of the spring connecting plates 201011 is more convenient for installing the spring. The setting of the fine scale lines is conducive to reading the error size and improving the error reading accuracy.

[0033] Specifically, the above-mentioned positioning frame two 203 includes a fixed clamp two 20301, a connecting rod two 20302, a pushing rod two 20303, a connecting pipe two 20304 and a stretching rod 20305. The connecting pipe two 20304 is fixedly connected to one end of the positioning beam two 20301. The fixed clamp two 20301 is in a lying V-shaped structure and there are two of them. The upper ends are symmetrically hinged at the U-shaped notches two 20306 on both sides of the lower end of the connecting pipe two 20304, and the groove parts of the two fixed clamps two 20301 are arranged oppositely to form a positioning steel bar clamping part. There are two pushing arms two 20307 which are bent and extended integrally with the upper ends of the two fixed clamps two 20301. The upper ends of the two pushing arms two 20307 are respectively hinged to one ends of the two connecting rods two 20302. The other ends of the two connecting rods two 20302 are symmetrically hinged to both ends of the horizontal pushing rod two 20303. The pushing rod two 20303 horizontally moves through a vertical strip-shaped through hole two 20308 provided on the connecting pipe two 20304. There is a stretching spring 20314 against the middle part of the bottom side of the pushing rod two 20303. The stretching spring 20314 is located inside the connecting pipe two 20304 and the lower end abuts against the spring fixing plate 20315. The spring fixing plate 20315 is fixedly connected inside the connecting pipe two 20304 and is located above the U-shaped notch two 20306. The lower end of the stretching rod 20305 is fixedly connected to the middle part of the pushing rod two 20303 and is built into the connecting pipe two 20304. The upper end of the stretching rod 20305 movably passes through the guide sleeve 20309. The guide sleeve 20309 is fixedly connected to the upper end of the connecting pipe two 20304. When in use, in the original state, under the action of the stretching spring, the two fixed clamps are kept closed. If positioning is required, if the clamping force is too large and it is difficult to directly press onto the positioning reference steel bar, then the stretching rod is used to pull upwards, thereby opening the two fixed clamps, inserting the positioning reference steel bar, releasing the stretching rod, and under the action of the pulling rope spring (the spring force can ensure stable clamping), automatically clamping the positioning reference steel bar. When it needs to be disassembled after the error detection is completed, the stretching rod is operated to move upwards again, opening the fixed clamps, taking out the positioning frame. The driving and locking mechanism composed of the pushing rod two, the connecting rod two, the connecting pipe two, the stretching spring and the stretching rod is used to drive the V-shaped fixed clamp two to clamp and fix the positioning reference steel bar to achieve reference fixing. The positioning is reliable, the operation is convenient, the error detection is accurate, and it can adapt to clamping of different steel bar diameters, with a wide application range, low cost, and the pushing rod two moves directionally inside the vertical strip-shaped through hole two, with good stability;The connecting pipe II 20304 is fixedly connected to the positioning beam II 201 by a threaded part and locked by a locking nut II 20310. A step II 20311 is provided at the bottom of the positioning beam II 201 where it is connected to the connecting pipe II 20304, and a baffle II 20312 is used to close the horizontal step surface. A directional auxiliary sleeve II 20313 is fixedly connected to the upper end surface of the push rod II 20303. The directional auxiliary sleeve II 20313 is sleeved outside the connecting pipe II 20304. The setting of the directional auxiliary sleeve II can provide better guiding stability and avoid the problem of poor directional movement stability of the connecting pipe II due to the poor rigidity of the opening. The lower ends of the two fixing clips II are provided with an octagonal bending guiding part, which is convenient for feeding the fixing clips II onto the positioning reference steel bars for fixing.

[0034] In order to stably read the positioning error, a circular binding rubber belt II 207 is provided at one end of the positioning beam II 201 away from the positioning frame II 203. After the circular binding rubber belt II 207 elastically binds the longitudinal steel bars, it is hung on the hook II 208. The hook II 208 is fixedly connected to the end of the positioning beam II 201 near the circular binding rubber belt II 207. After binding the steel bars with the circular binding rubber belt II, it can ensure that the error detection fixture closely adheres to the transverse steel bars to be detected, improve the accuracy of error detection, eliminate the need for manual pressing of the positioning beam, and directly read the error data after installation, thereby improving the detection efficiency and accuracy of the steel bar positioning error.

[0035] The operation method of the positioning error detection device for the upper-layer transverse steel bars of the box girder bottom slab includes the following steps: Step 1: According to the longitudinal spacing dimension of the transverse steel bars to be detected designed, adjust the spacing of the error detection fixture on the positioning beam, and symmetrically install the springs on both sides. The installation distance of the connecting columns is greater than the error range of the transverse steel bars to be detected; Step 2: Use the detection device for the upper-layer transverse steel bars of the box girder bottom slab to measure while being arranged near the longitudinal middle of the box girder steel bars. Adjust the height of the positioning frame. First, fix the two positioning frames to the top-layer steel bars of the portal bars at the ends of the box girder, and insert the error detection fixture into the transverse steel bars to be detected; Step 3: After insertion, use the circular binding rubber belt to bind the end of the positioning beam to the longitudinal steel bars, so that the positioning beam remains horizontal and the error detection fixture is clamped tightly on each transverse steel bar to be detected to complete the detection of the transverse steel bars to be detected; Step 4: Read and record the moving distance of the error detection fixture of the detected transverse steel bars on the positioning beam. Subtract the detected data from the theoretical data to obtain the size of the steel bar positioning error, and obtain the error detection calculation of the first round of transverse steel bars to be detected; Step 5: After the last transverse steel bar in Step 4 is adjusted to meet the positioning requirements, use it again as the positioning reference steel bar for the next round of detection, and repeat the operations in Steps 1-4 to complete the error detection of the next round of transverse steel bars. Step 6: Repeat the operation in Step 5 until all additional lateral steel bar error measurements are completed.

[0036] The operating method of the lateral steel bar positioning error detection device uses the door-shaped steel bar integrated with the lower-layer steel bars at the end of the bottom plate as the starting position at the end starting position, and cooperates with the positioning error detection of the error detection fixture, which can achieve the positioning error of the lateral steel bars on the bottom plate. Moreover, the positioning error detection efficiency and positioning error detection accuracy are high, and the error detection saves time and effort.

[0037] Among them, as Figures 15 - 22 shown, the leveling machine includes a frame 301, a traveling mechanism 302, an auger roller 303, a first slurry lifting roller 304, and a second slurry lifting roller 305. The traveling mechanism 302 is installed at both ends of the frame 301 and is placed on two tracks 307 arranged on both sides of the box girder 306. The two tracks 307 are installed on the traveling frames on both sides of the top surface of the box girder formwork. The auger roller 303, the first slurry lifting roller 304, and the second slurry lifting roller 305 are arranged from front to back at the bottom of the frame 301 and are respectively connected to a first transmission device, a second transmission device, and a third transmission device to drive their rotation. The first transmission device, the second transmission device, and the third transmission device are installed on the frame 301. The lowest points of the auger roller 303, the first slurry lifting roller 304, and the second slurry lifting roller 305 are 1-2 cm lower than the height of the concrete to be leveled. Using the auger roller for stirring, feeding, and spreading, the first slurry lifting roller for rough leveling, and the third slurry lifting roller for fine leveling can greatly improve the leveling effect, avoid the appearance of traditional concrete ridges, and save time and effort without manual assistance.

[0038] To better achieve leveling, symmetric annular concave conical surfaces 308 are provided in the middle of the first slurry lifting roller 304 and the second slurry lifting roller 305. The slope of the annular concave conical surface 308 is 2%, and annular convex conical surfaces 309 are provided at both ends. The inner end of the annular convex conical surface 9 is small and the outer end is large, with a slope of 3%. The structure of the annular concave conical surface in the middle of the first slurry lifting roller and the second slurry lifting roller is adopted to facilitate the extrusion of the concrete in the middle to both sides, making it more dense and forming a slope structure with a high middle and low sides. The annular convex conical surfaces at both ends are convenient for compacting and stabilizing the leveling area, and also avoid poor leveling effect on the side due to excessive outflow of the slurry during the leveling process, and can play a certain role in converging.

[0039] To meet the requirements of leveling, stirring, and feeding, the length of the auger roller 303 is 7 m, and the lengths of the first slurry lifting roller 304 and the second slurry lifting roller 305 are 8.6 m. To meet the requirements of the leveling area, the lengths of the middle annular concave conical surfaces 308 of the first slurry lifting roller 304 and the second slurry lifting roller 305 are both 2 m, the straight section length is 2.7 m, and the lengths of the annular convex conical surfaces 309 at both ends are 0.5 m.

[0040] In order to walk stably, the walking mechanism 302 includes a walking frame 30201 and walking wheels 30202. The walking wheels 30202 are rotatably connected to the bottom of the walking frame 30201. The walking wheels 30202 are connected with a power mechanism for driving their walking. The walking frame 30201 is connected to the machine frame 301 through a height adjustment device 30203. Specifically, the adjustment device 30203 includes a portal frame 30204, a chute 30205 and a lifting adjustment screw 30206. The lower end of the portal frame 30204 is fixedly connected to the walking frame 30201 through a flange plate. The two side columns of the portal frame 30204 are movably clamped into the two chutes 30205 and are fixedly connected to the machine frame 301 through a bolt 30207. A vertical strip-shaped through hole 30208 is provided in the column at the connection bolt 30207. Each chute 30205 is fixedly connected to the machine frame 301 in a back-to-back manner by two angle steels 30209 through a bolt 30210. A horizontal strip-shaped through hole 30211 is provided at the position of the machine frame 301 where the connection bolt 30207 and the bolt 30210 are located. Two lifting adjustment screws 30206 are arranged along the front and back of the end of the machine frame 1 (i.e., arranged left and right in the width direction of the portal frame 30204). Each is rotatably connected to the top beam of the portal frame 30204 through a bearing block 30212 near the top, and the lower part is screwed to the machine frame 301 through a nut 30213. A rotating ring 30219 is fixedly connected to the top of the lifting adjustment screw 206. By rotating the lifting adjustment screw, the lifting adjustment screw rotates around the fixed point of the bearing block 30212. The nut screwed to the lower end of the lifting adjustment screw is fixed to the machine frame. After the lifting adjustment screw rotates, it drives the nut to move up and down, thereby realizing the relative up and down movement between the machine frame and the portal frame. After the adjustment is in place, it is locked by the bolt 30207, thereby realizing the height adjustment of the machine frame and obtaining a large-size adjustment of the leveling height. The adjustment is convenient and fast, easy to adjust, and after adjustment, it also avoids the interference between the machine frame and the embedded steel bars on both sides of the surface to be leveled. Moreover, it can also be adjusted in the width direction along the horizontal direction, and can adapt to the matching of different track widths directly. The adjustment is simple. The power mechanism includes a walking motor 30214, a walking belt transmission mechanism 30215 and a walking chain transmission mechanism 30216. The walking chain transmission mechanism 30216 includes two driven sprockets 30222 fixedly connected to the walking wheels, an idler sprocket 30223 and a driving sprocket 30224. The two driven sprockets 30222 and the idler sprocket 30223 and the idler sprocket 30223 and the driving sprocket 30224 are all connected by a transmission chain of a double-row chain. The idler sprocket 30223 is rotatably connected to the walking frame 30201 through a bearing block 5. The driving sprocket 30224 is fixedly connected to a transition transmission shaft 30220. The transition transmission shaft 30220 is rotatably connected to the walking frame 30201 through a bearing block 6 30221. The other end of the transition transmission shaft 30220 is connected to the motor shaft of the walking motor 30214 through a walking belt transmission mechanism 30215. The walking motor 30214 is fixedly connected to the walking frame 30201.The transmission mechanism drives the two wheels to directly have power to walk through belt transmission and secondary chain transmission, and can achieve stable and reliable power drive. There is a first shielding cover 30225 installed above the traveling motor 30214 and the transition transmission shaft 30220, which can play the role of safely protecting the motor and the sixth bearing seat, and prevent rainwater or other concrete slurry from dripping or splashing into the motor or the bearing seat, with higher use safety. There is a second shielding cover 30217 arranged outside the driven sprocket 30222 and the transition sprocket 30223. The second shielding cover 30217 has a bent cross-section, and its length covers outside the driven sprocket 30222 and the transition sprocket 30223. The second shielding cover 30217 is fixedly connected to the traveling frame 30201 through two cantilevers 30218. The setting of the second shielding cover 30217 can protect the driven sprocket 30222 and the transition sprocket 30223 from concrete slurry splashing onto the sprockets.,

[0041] In order to reduce the problem that it is difficult to better agitate and feed the material due to excessive bending of the agitating cage roller during the agitating and feeding process, two of the above-mentioned agitating cage rollers 303 are arranged side by side and rotatably connected along the same horizontal axis to the first lifting bearing seat 310 arranged at the bottom of the frame 301. Both ends of each agitating cage roller 303 are rotatably connected to the first lifting bearing seat 310, and the first lifting bearing seat 310 is fixedly connected to the frame 301. Each agitating cage roller 303 is connected with a first transmission device and the first transmission device is installed at the outer end. There are feeding spiral blades 30301 with reverse spirals arranged on the two agitating cage rollers 303; the feeding spiral blades can play the role of agitating and feeding the concrete, driving the middle material to both sides, making the covered thickness uniform during leveling, and being more conducive to leveling. Using two agitating cage rollers can reduce the weight of the support points, and the single agitating power performance is reduced, which is more conducive to controlling the agitation and feeding. Using the lifting bearing seat is convenient for fine-tuning the height of the agitating cage roller, avoiding the inconsistent horizontal installation of the tracks of the traveling mechanism, thus adapting to different application scenarios, reducing costs, also reducing the installation requirements, and improving the installation efficiency; Specifically, to facilitate the lifting of the first lifting bearing seat, the first lifting bearing seat 310 includes a first portal frame 31001, a first sliding square frame 31002, a first bearing seat 31003, and a first lifting screw rod 31004. The first bearing seat 31003 is fixedly connected upside down to the bottom of the first sliding square frame 31002. The first sliding square frame 31002 is slidably placed in the chute on both sides of the first portal frame 31001. The first portal frame 31001 is fixedly connected to the frame 301. The first lifting screw rod 31004 is helically connected to the top cross beam of the first sliding square frame 31002. The upper end of the first lifting screw rod 31004 is rotatably connected to the center of the top horizontal cross beam of the first portal frame 31001 through a first support bearing seat 31005, and a first rotating handle 31006 is fixedly connected to the extended end. By rotating the first lifting screw rod, the first lifting screw rod rotates relative to the first bearing seat, and the threaded part at the lower end drives the first cutting tool square frame to move up and down along the chute, realizing the fixation of the first bearing seat. A first locking screw 31007 is arranged on the side of the first portal frame 31001, and the first locking screw can lock the first sliding square frame after sliding, improving reliability.

[0042] The frame 301 is a truss structure, which is fixed by butt - joint at both ends and has a downward convex middle section for installing the agitating roller, the first slurry lifting roller, the second slurry lifting roller, and the transmission mechanism.

[0043] The first transmission device, the second transmission device, and the third transmission device all include a driving motor 312, a belt transmission mechanism 313, and a double - row chain drive mechanism 314. One end of the agitating roller 303, the first slurry lifting roller 304, and the second slurry lifting roller 305 is connected to one section of the transition shaft 315 through the double - row chain drive mechanism 314. The transition shaft 315 is rotatably connected to the frame 301 through a fourth bearing seat 316 and is connected to the motor shaft of the driving motor 312 through the belt transmission mechanism 313 with multiple belts at the other end. The driving motor 312 is fixedly connected to the frame 301. The second transmission device and the third transmission device are respectively arranged near both ends of the frame 301 and adopt belt transmission, which has low noise and is convenient for realizing fast power transmission. The double - row chain improves the transmission reliability. A splash guard 317 is installed outside the double - row chain drive mechanism 314, which can prevent concrete slurry from splashing onto the chain and sprocket, playing a protective role.

[0044] To avoid excessive bending of a single roller due to its too large self-weight, which may affect the leveling effect, both ends of the first slurry lifting roller 304 and the second slurry lifting roller 305 are respectively rotatably connected to two sets of second lifting bearing seats 311 provided at the bottom of the frame 301. The first slurry lifting roller 304 and the second slurry lifting roller 305 both adopt a two-roller structure with the same axis. The rotating shafts at the separation points of the two ends of the rollers are rotatably connected to the frame 301 through the second lifting bearing seats 311. The second lifting bearing seats 311 are fixedly connected to the frame 301. The disconnection positions of the two segments of the first slurry lifting roller 304 and the second slurry lifting roller 305 are arranged staggeredly. A support point is provided for a single slurry lifting roller, which can effectively reduce the probability of excessive bending. And in cooperation with the two staggeredly arranged slurry lifting rollers, the leveling effect is better.

[0045] Specifically, the second lifting bearing seat 311 includes a second portal frame 31101, a second sliding square frame 31102, a second bearing seat 31103 and a second lifting screw 31104. The second bearing seat 31103 is fixedly connected to the bottom of the second sliding square frame 31102 in an inverted manner. The second sliding square frame 31102 is slidably placed in the chutes on both sides of the second portal frame 31101. The second portal frame 31101 is fixedly connected to the frame 301. The second lifting screw 31104 is helically connected to the top cross beam of the second sliding square frame 31102. The upper end of the second lifting screw 31104 is rotatably connected to the center of the top horizontal cross beam of the second portal frame 31101 through a second support bearing seat 31105, and a second rotating handle 31106 is fixedly connected to the extended end. By rotating the second lifting screw, the second lifting screw rotates relative to the second bearing seat, and the threaded part at the lower end drives the second cutting tool square frame to move up and down along the chute, realizing the fixation of the first bearing seat. A first locking screw 31107 is provided on the side of the second portal frame 31101. The first locking screw can lock the second sliding square frame after sliding, improving the reliability.

[0046] In summary, the leveling machine has the following advantages: 1) Using the auger roller for stirring, feeding, and spreading, the first slurry lifting roller for rough leveling, and the third slurry lifting roller for fine leveling can greatly improve the leveling effect, avoid the appearance of traditional concrete ridges, and save time and effort without manual assistance; 2) The middle annular concave of the first slurry lifting roller and the second slurry lifting roller is convenient for extruding the middle concrete to both sides, making it more dense. The annular convex conical surfaces at both ends are convenient for compacting and stabilizing the leveling area, and also avoid poor leveling effect on the side due to excessive outflow of the slurry during the leveling process, and can play a certain converging role; setting the length of the auger roller can meet the coverage range of the stirred concrete and the feeding requirements; setting the lengths of each section of the first slurry lifting roller and the second slurry lifting roller can meet the requirements of the leveling area; 3) Two stirring screw rollers are adopted. The feeding spiral blades can stir and feed the concrete, driving the materials in the middle to both sides, making the thickness covered during leveling uniform, which is more conducive to leveling. Using two stirring screw rollers can reduce the weight of the support points and also reduce the single stirring power performance, making it more conducive to controlling the stirring and feeding. The lifting bearing seat is used to conveniently fine-tune the height of the stirring screw rollers, avoiding inconsistent installation levels of the tracks of the walking mechanism, thus adapting to different application scenarios, reducing costs, lowering installation requirements, and improving installation efficiency; 4) By rotating the first lifting screw rod, the first lifting screw rod rotates relative to the first bearing seat, and the threaded part at the lower end drives the first cutter box to move up and down along the chute, realizing the fixation of the first bearing seat; 5) Belt drive is adopted, which has low noise and is convenient for realizing rapid power transmission. The double-row chain improves the transmission reliability; 6) The single slurry lifting roller is provided with support points, which can effectively reduce the probability of excessive bending. And in combination with the two staggered slurry lifting rollers, the leveling effect is better, and the staggered arrangement does not affect the leveling effect caused by slurry leakage at the segmented part; 7) By rotating the second lifting screw rod, the second lifting screw rod rotates relative to the second bearing seat, and the threaded part at the lower end drives the second cutter box to move up and down along the chute, realizing the fixation of the first bearing seat; 8) By rotating the lifting adjustment screw rod, the lifting adjustment screw rod rotates around the fixed point of the third bearing seat. The nut screwed to the lower end of the lifting adjustment screw rod is fixed to the frame. After the lifting adjustment screw rod rotates, it drives the nut to move up and down, thereby realizing the relative up and down movement of the frame and the portal frame. After adjustment, it is locked with the first bolt, thus realizing the adjustment of the frame height and obtaining a large-size adjustment of the leveling height. The adjustment is convenient, fast, and easy. After adjustment, it also avoids interference between the frame and the embedded steel bars on both sides of the surface to be leveled. Moreover, it can also be adjusted in width along the horizontal direction, and can adapt to the matching of different track widths directly, and the adjustment is simple.

[0047] The operating method of the leveling machine is as follows: (1) The high-speed rail box girder leveling machine is installed at the starting point of the box girder to be leveled; (2) Spray the required amount of concrete on the top of the box girder to be poured. After spraying, spread out the concrete, and the concrete is 1 - 2 cm higher than the surface to be leveled; (3) Start the high-speed rail box girder leveling machine to move, and the moving speed is 0.1 m / s; it can level the top surface of the box girder while meeting the efficiency; (4) The front stirring screw roller stirs and feeds the materials, the first slurry lifting roller conducts rough leveling, and the second slurry lifting roller conducts fine leveling; (5) After the high-speed rail box girder leveling machine completes one-way movement, move back to the starting point in the reverse direction to complete the laying of the concrete on the top of the box girder. Moving back and forth in one cycle can avoid the problem that the disconnected point cannot be leveled.

[0048] The lowest points of the auger roller, the first screeding roller, and the second screeding roller are 1-2 cm lower than the height of the concrete to be leveled. The auger roller is used for stirring, feeding, and spreading the material, the first screeding roller is used for rough leveling, and the third screeding roller is used for fine leveling, which can greatly improve the leveling effect, avoid the appearance of traditional concrete ridges, and eliminate the need for manual assistance, saving time and effort. The walking speed is 0.1 m / s, and the leveling of the top surface of the box girder can be achieved while meeting the efficiency requirements.

[0049] In step 6), the top surface is cured using a top surface water storage device, as Figures 23 - 25 shown. The top surface water storage device includes two groups of first steel bar rows 401 and second steel bar rows 402 respectively arranged at positions close to the edges on the top of the precast box girder. The first steel bar row 401 is arranged along the length direction of the precast box girder, and the second steel bar row 402 is arranged along the width direction of the precast box girder. The rectangular area enclosed by the first steel bar row 401 and the second steel bar row 402 is the pouring area. There is a strip-shaped water bag 403 filled with water on the top of the precast box girder. The strip-shaped water bag 403 is made of a deformable flexible material, and specifically, a high-strength waterproof material or a rubber composite material can be selected. The strip-shaped water bag 403 forms a rectangular ring around the pouring area. Two opposite sides of the rectangular ring are respectively arranged outside the first steel bar row 401, and the other two opposite sides are respectively set against the second steel bar row 402. The number of strip-shaped water bags 403 is not less than one, and their heads and tails are detachably connected. An inlet and an outlet are respectively arranged at the head and tail of the strip-shaped water bag 403. Extension side strips 404 are also correspondingly arranged at the head and tail of the strip-shaped water bag 403. Matching male and female fasteners are respectively arranged on the extension side strips 404. The strip-shaped water bag 403 is detachably connected at its end through the male and female fasteners. A number of extension side strips 404 are arranged along the length direction at the head and tail of the strip-shaped water bag 403, and the length between adjacent two extension side strips 404 is not less than 30 cm. The head and tail of the strip-shaped water bag 403 are overlapped. An auxiliary water bag 405 is also arranged at the overlapping position of the head and tail of the strip-shaped water bag 3. To further enhance the sealing performance, an auxiliary water bag is added in the overlapping area at the head and tail. The auxiliary water bag is embedded in the gap of the overlapping part of the head and tail of the strip-shaped water bag 403 to fill the gap at the overlapping position.

[0050] A structure using a strip-shaped water bag as a moisture conservation cofferdam on the top of a precast box girder. The flexible strip-shaped water bag is used to replace traditional rigid cofferdam materials, greatly simplifying the installation process and reducing the labor cost of erection; the detachable connection design of the water bag supports repeated use, reducing material loss and long-term maintenance cost; it can closely fit the steel bar rows and the surface of the girder body, avoiding leakage problems caused by gaps in traditional cofferdams; the flexible strip-shaped water bag can also adjust its shape according to the actual environment to avoid interference with the structure on the top of the box girder; it supports the rapid assembly of the water bag to meet the long-distance enclosure requirements of long-span box girders; the two-way design of the water inlet / outlet is convenient for water injection, water replacement and water level control, simplifying the maintenance management process; in addition, using this application can effectively reduce the operation risk during the handling of traditional sandbags and other structures and reduce resource waste.

[0051] When using the top surface water storage device for maintenance, the following process can be followed for treatment; Step 1: After the box girder is poured, clean the surface debris and confirm the positions of the first and second steel bar rows; Step 2: Arrange the strip-shaped water bag along the steel bar rows and connect the head and tail through the male and female buckles of the extension side strip to form an internally enclosed cofferdam. When connecting, adjust the buckling position of the side strip according to the spacing of the steel bar rows to avoid interference with the embedded steel bars; Step 3: After filling the auxiliary water bag with water; Step 4: Inject water into the main water bag through the water inlet. After the water bag is filled, a water storage pool is formed to cover the entire pouring area; then inject water into the water storage pool to form a maintenance water layer; Step 5: After the maintenance period ends, open the water outlet to drain the water body, disassemble the water bag, clean and store it for repeated use.

[0052] Through the above implementation method, the device effectively solves the problems of high labor cost, poor sealing and interference with embedded parts of traditional cofferdams, and provides an efficient and reliable solution for the standardized maintenance of precast concrete components.

[0053] For the storage and maintenance in step 7), to solve the problem that it is difficult to spray water for maintenance on the end face, a modular maintenance device for the side end face of the precast box girder is used for the end face maintenance of the box girder, such as Figures 26 - 28As shown in the figure, the modular curing device for the side end face of the precast box girder includes a closed outer frame body 501; waterproof cloth 502 and sponge pads 503 are respectively covered on the front and rear end sides of the outer frame body 501; positioning bayonets 504 are arranged on the waterproof cloth 502 and the sponge pads 503 at positions corresponding to the pre-tensioned steel bars of the precast box girder; hooks 505 are arranged on the upper top of the outer frame body 501; the hooks 505 are detachably connected to the top-sealing embedded steel bars at the top of the precast box girder through a pulling rope. The outer frame body 501 includes two unit outer frame body structures with the same structure, and a single unit outer frame body is a closed structure surrounded by hollow steel pipes; its contour is the same as the half-side contour shape cut along the center line of the precast box girder; connecting pieces are arranged at positions on the unit outer frame body close to the center line of the precast box girder; the two unit outer frame bodies are detachably connected through the connecting pieces. An inner frame body 506 is arranged at the middle part of the outer frame body 501 corresponding to the inner cavity position of the precast box girder; a door frame 507 is also hinged and installed on the inner frame body 506 through a hinge; the waterproof cloth 502 and the sponge pads 503 at the door frame 507 are independent of those on the outer frame body 501. In this embodiment, the inner frame body is fixed to the outer frame body by welding; waterproof cloth 502 is also arranged on the other side surface of the sponge pad 503 corresponding to the edge position of the outer frame body 501; the front and rear waterproof cloths 502 are tied together with the sponge pad 503 and the outer frame body 501 through stainless steel wires. The positioning bayonet 504 arranged on the waterproof cloth 502 is in the shape of a cross cut at the axis corresponding to the pre-tensioned steel bar. The positioning bayonet 504 arranged on the sponge pad 503 is a petal-shaped opening structure with a symmetry axis coinciding with the axis of the pre-tensioned steel bar. An extension rod 508 is also arranged at the lower part of the outer frame body 501; a binding band is detachably arranged on the extension rod 508. In this embodiment, the other end of the binding band is connected to the pier where the precast box girder is placed, so as to provide an inward pulling force to the bottom side of the outer frame body, enabling the sponge pad to closely adhere to the precast box girder.

[0054] When using the modular curing device for the side end face of the precast box girder to cure the end face of the box girder, the following process can be referred to for treatment: 1. Splice the two unit frames on the precast yard ground and connect them through connecting pieces such as bolts or positioning pins; 2. Lift the device to the side end face of the box girder, horizontally insert it after aligning with the position of the pre-tensioned steel bar for installation, and then respectively connect the corresponding parts of the outer frame lifted through the top pulling rope and the bottom binding band to the upper and lower sides of the precast box girder; Spray clean water on the sponge pad as needed, and maintain the humidity of the end face through the double-layer structure of the waterproof cloth and the sponge pad.

[0055] As described above, it is only the specific implementation manner of the present invention. However, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A manufacturing method for simply supported box girders of high-speed railways, characterized in that, The method includes the following steps: 1) Binding the steel reinforcement cage of the box girder: According to the design requirements, bind the box girder steel bars on the steel bar binding jig to form a steel reinforcement cage of the box girder, and insert a rubber tube into the pre-stretched hole. 2) Quality inspection: Conduct quality inspection on the steel reinforcement cage of the box girder according to the design requirements. 3) Hoisting: After passing the quality inspection, transport the bound steel reinforcement cage of the box girder to the box girder mold and adjust it to the appropriate position. 4) Pouring: According to the design requirements, pour concrete of the corresponding grade into the box girder mold to complete the pouring. 5) Leveling: After the concrete reaches the set strength, install a leveling machine, lay concrete with a set thickness, and then operate the leveling machine to level it. 6) Top surface curing: Conduct top surface curing after leveling. 7) Storage curing: After reaching the set strength, hoist it to the storage pier for storage curing.

2. The manufacturing method of a simply supported box girder for high-speed railway according to claim 1, characterized in that, During the binding process of the upper-layer transverse steel bars at the bottom plate of the box girder steel bars, a positioning device for the upper-layer transverse steel bars at the bottom plate of the box girder is used for positioning and then binding. The positioning device for the upper-layer steel bars at the bottom plate of the box girder includes a strip-shaped positioning beam 1 (101), positioning clamps (102), and a positioning frame 1 (103). One end of the positioning beam 1 (101) is fixedly connected to the positioning frame 1 (103). The positioning frame 1 (103) is used for detachably fixedly connecting to the reference positioning steel bar 1 (104). A plurality of positioning clamps (102) are used, which are movably connected to the positioning beam 1 (101) and fastened by fasteners (105). A plurality of positioning clamps (102) can be inserted into multiple longitudinally arranged transverse steel bars to be positioned (106) for positioning.

3. The manufacturing method of a simply supported box girder for high-speed railway according to claim 1, characterized in that, The positioning frame 1 (103) includes a fixed clamp 1 (10301), a connecting rod 1 (10302), a pushing rod 1 (10303), a connecting pipe 1 (10304), and a screw rod (10305). The connecting pipe 1 (10304) is fixedly connected to one end of the positioning beam 1 (101). The fixed clamp 1 (10301) is in a lying V-shaped structure, with two of them. The upper ends are symmetrically hinged at the U-shaped notches 1 (10306) on both sides of the lower end of the connecting pipe 1 (10304), and the grooves of the two fixed clamps 1 (10301) are arranged oppositely to form a positioning steel bar clamping part. Two bent and extended pushing arms 1 (10307) are integrally formed at the upper ends of the two fixed clamps 1 (10301). The upper ends of the two pushing arms 1 (10307) are respectively hinged to one ends of the two connecting rods 1 (10302). The other ends of the two connecting rods 1 (10302) are symmetrically hinged to both ends of the horizontal pushing rod 1 (10303). The pushing rod 1 (10303) horizontally movably passes through the vertical strip-shaped through hole 1 (10308) provided on the connecting pipe 1 (10304). The lower end of the screw rod (10305) is rotatably connected to the middle of the pushing rod 1 (10303) and is placed inside the connecting pipe 1 (10304). The upper end of the screw rod (10305) is threadedly connected to the adjusting nut (10309), and the adjusting nut (10309) is fixedly connected to the upper end of the connecting pipe 1 (10304).

4. The manufacturing method of a simply supported box girder for high-speed railway according to claim 2, characterized in that, During the quality inspection of the steel cage of the box girder, the quality inspection of the upper-layer transverse steel bars at the bottom plate of the box girder is carried out by using a positioning error detection device for the upper-layer transverse steel bars. The positioning error detection device for the upper-layer transverse steel bars includes a strip-shaped positioning beam two (201), an error detection fixture (202) and a positioning frame two (203). One end of the positioning beam two (201) is fixedly connected to the positioning frame two (203), and the positioning frame two (203) is used for detachably fixedly connecting to the positioning reference steel bar two (204). A plurality of error detection fixtures (202) are movably sleeved on the positioning beam two (201). Springs (205) are symmetrically connected to both sides of each error detection fixture (202), and the other ends of the springs (205) are fixedly connected to the connecting column (210). The connecting column (210) is fixedly connected to the positioning beam two (201). A plurality of error detection fixtures (202) can be clamped into a plurality of horizontally arranged transverse steel bars to be detected (206). A scale line two (20101) is provided on the positioning beam two (201).

5. A method for manufacturing a simply supported box girder for high-speed railway according to claim 4, characterized in that, The positioning frame two (203) includes a fixed clamp two (20301), a connecting rod two (20302), a pushing rod two (20303), a connecting pipe two (20304) and a tension rod (20305). The connecting pipe two (20304) is fixedly connected to one end of the positioning beam two (201). The fixed clamp two (20301) is in a lying V-shaped structure and there are two of them. The upper ends are symmetrically hinged at the U-shaped notches two (20306) on both sides of the lower end of the connecting pipe two (20304), and the groove parts of the two fixed clamps two (20301) are arranged oppositely to form a positioning steel bar clamping part. Two pushing arms two (20307) which are bent and extended integrally with the upper ends of the two fixed clamps two (20301) are provided. The upper ends of the two pushing arms two (20307) are respectively hinged to one ends of the two connecting rods two (20302). The other ends of the two connecting rods two (20302) are symmetrically hinged to both ends of the horizontal pushing rod two (20303). The pushing rod two (20303) horizontally movably passes through a vertical strip-shaped through hole two (20308) provided on the connecting pipe two (20304). A tension spring (20314) abuts against the middle part of the bottom side of the pushing rod two (20303). The tension spring (20314) is located inside the connecting pipe two (20304) and the lower end abuts against the spring fixing plate (20315). The spring fixing plate (20315) is fixedly connected inside the connecting pipe two (20304) and is located above the U-shaped notch two (20306). The lower end of the tension rod (20305) is fixedly connected to the middle part of the pushing rod two (20303) and is built into the connecting pipe two (20304). The upper end of the tension rod (20305) movably passes through the guide sleeve (20309). The guide sleeve (20309) is fixedly connected to the upper end of the connecting pipe two (20304).

6. The manufacturing method of a simply supported box girder for high-speed railway according to claim 1, characterized in that, The leveling machine includes a frame (301), a traveling mechanism (302), an auger roller (303), a first slurry lifting roller (304) and a second slurry lifting roller (305). The traveling mechanisms (302) are installed at both ends of the frame (301), and the traveling mechanisms (302) are placed on two rails (307) arranged on both sides of the box girder (306). The auger roller (303), the first slurry lifting roller (304) and the second slurry lifting roller (305) are arranged from front to back at the bottom of the frame (301) and are respectively connected with a first transmission device, a second transmission device and a third transmission device to drive their rotation. The first transmission device, the second transmission device and the third transmission device are installed on the frame (301). The lowest points of the auger roller (303), the first slurry lifting roller (304) and the second slurry lifting roller (305) are 1 - 2 cm lower than the height of the concrete to be leveled.

7. The manufacturing method of a simply supported box girder for high-speed railway according to claim 6, characterized in that, Symmetric annular concave conical surfaces (308) are arranged in the middle of the first slurry lifting roller (304) and the second slurry lifting roller (305). The slope of the annular concave conical surface (308) is 2%, and annular convex conical surfaces (309) are arranged at both ends. The inner end of the annular convex conical surface (309) is small and the outer end is large, and the slope is 3%. The length of the auger roller (303) is 7 m, and the lengths of the first slurry lifting roller (304) and the second slurry lifting roller (305) are 8.6 m. The lengths of the middle annular concave conical surfaces (308) of the first slurry lifting roller (304) and the second slurry lifting roller (305) are both 2 m, the lengths of the straight sections are 2.7 m, and the lengths of the annular convex conical surfaces (309) at both ends are 0.5 m.

8. A method for manufacturing a simply supported box girder for high-speed railway, characterized in that, The traveling mechanism (302) includes a traveling frame (30201) and traveling wheels (30202). The traveling wheels (30202) are rotatably connected to the bottom of the traveling frame (30201). The traveling wheels (30202) are connected with a power mechanism to drive their traveling. The traveling wheel frame (30201) is connected to the frame (301) through a height adjusting device (30203). The adjusting device (30203) includes a portal frame (30204), a chute (30205) and a lifting adjusting screw (30206). The lower end of the portal frame (30204) is fixedly connected to the traveling frame (30201) through a flange plate. The two side columns of the portal frame (30204) are movably clamped into two chutes (30205) and are fixedly connected to the frame (301) through bolts 1 (30207). Vertical strip-shaped through holes (30208) are arranged at the columns where the connecting bolts 1 (30207) are located. Each chute (30205) is fixedly connected to the frame (301) back to back by two angle steels (30209) through bolts 2 (30210). Horizontal strip-shaped through holes (30211) are arranged at the frame (301) where the connecting bolts 1 (30207) and the bolts 2 (30210) are located. Two lifting adjusting screws (30206) are used. Each is rotatably connected to the top beam of the portal frame (30204) through a bearing block 3 (30212) near the top, and the lower part is helically connected to the frame (301) through a nut (30213).

9. The manufacturing method of a simply supported box girder for high-speed railway according to claim 6, characterized in that Two auger rollers (303) are adopted and are rotatably connected side by side along the same horizontal axis to a first lifting bearing seat (310) arranged at the bottom of the frame (301). The first lifting bearing seat (310) is fixedly connected to the frame (301). Each auger roller (303) is connected with a first transmission device and the first transmission device is installed at the outer end. Feeding spiral blades (30301) with reverse spirals are arranged on the two auger rollers (303). The first lifting bearing seat (310) includes a first portal frame (31001), a first sliding square frame (31002), a first bearing seat (31003) and a first lifting screw rod (31004). The first bearing seat (31003) is fixedly connected to the bottom of the first sliding square frame (31002) in an inverted manner. The first sliding square frame (31002) is slidably placed in the chutes on both sides of the first portal frame (31001). The first portal frame (31001) is fixedly connected to the frame (301). The first lifting screw rod (31004) is helically connected to the top cross beam of the first sliding square frame (31002). The upper end of the first lifting screw rod (31004) is rotatably connected to the center of the top horizontal cross beam of the first portal frame (31001) through a first support bearing seat (31005), and a first rotating handle (31006) is fixedly connected to the extended end of this end.

10. A method for manufacturing a simply supported box girder for high-speed railway, as described in claim 1, characterized in that, Top surface curing is carried out by using a top surface water storage device. The top surface water storage device includes two groups of first steel bar rows (401) and second steel bar rows (402) respectively arranged at positions close to the edges at the top of the precast box girder. The first steel bar rows (401) are arranged along the length direction of the precast box girder, and the second steel bar rows (402) are arranged along the width direction of the precast box girder. The rectangular area enclosed by the first steel bar rows (401) and the second steel bar rows (402) is the pouring area. A strip-shaped water bag (403) filled with water is arranged at the top of the precast box girder. The strip-shaped water bag (403) is made of a deformable flexible material. The strip-shaped water bag (403) forms a rectangular ring around the pouring area. Two opposite sides of the rectangular ring are respectively arranged outside the first steel bar rows (401), and the other two opposite sides are respectively placed against the second steel bar rows (402).

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