Double-end face synchronous matching short line construction method for prefabricated bridge section

Abstract

The application discloses a double-end synchronous matching short-line construction method of prefabricated bridge segments, and the beam manufacturing platform is divided into a first prefabricated beam area, a matching cast-in-place area, a second prefabricated beam area, an independent cast-in-place area and a transfer area; first, the Nth and N+2th segment beams are prepared in the independent cast-in-place area, then the segment beams are transferred to the first prefabricated beam area and the second prefabricated beam area in sequence through a moving trolley, the Nth and N+2th segment beams are lofted and matched, and then the N+1th segment beam is cast in place in the matching cast-in-place area between the two segment beams; meanwhile, the N+4th segment beam is prepared in the independent cast-in-place area, and after curing, the segment beams are shifted, the Nth and N+1th segment beams are transferred to a beam storage area through the transfer area, the N+2th and N+4th segment beams are transferred to the first prefabricated beam area and the second prefabricated beam area, and the next cycle of prefabrication is carried out; the application has high matching precision, high utilization rate of a construction site and can greatly improve the segment beam prefabrication efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bridge engineering construction, and relates to a bridge segment short-line method construction technology, in particular to a double-end-face synchronous matching short-line construction method for prefabricating bridge segments. BACKGROUND

[0002] At present, the segmental precast assembly construction method is increasingly used for prestressed concrete bridges in China. The core of this method is the precast of segments, which is specifically divided into long-line method and short-line method. The long-line method segment precast construction technology is relatively mature, and has a history of more than 20 years in China. The short-line method segment precast is more commonly used in bridge engineering in busy urban areas due to its complex construction technology, high measurement accuracy requirement and complex linear control.

[0003] The so-called short-line method refers to the construction method of dividing a span structure into several segments, pouring the next segment as a matching segment with the already poured segment, and pouring the segments block by block with the same adjustable formwork. The short-line method precast assembly bridge has the characteristics of high industrialization, standardization and assembly, and has been widely used in China. Research shows that there is a lack of effective control method in the actual project using the short-line method segment precast, and the bridge linear control accuracy cannot meet the requirements, which to some extent limits the further development of the short-line method segment precast construction method.

[0004] Research shows that one of the main reasons for the inaccurate control of the linear of the short-line method construction bridge is the matching accuracy during precast beam and construction interference. Since the short-line method precast only pours one segment at a time for each pedestal, one of the key problems in this technology is the linear control during precast, which is mainly manifested as the accurate positioning problem of the matching beam segment. The existing matching beam positioning method is mainly to use the coordinate positioning of the control point, that is, to build two fixed measurement towers, to embed a total station instrument in the measurement tower, and to observe the coordinates of the control points embedded on the upper surface of the matching beam segment to accurately position. The positioning method based on coordinate control of the measurement tower has many problems, such as: the settlement of the measurement tower will seriously interfere with the positioning accuracy, the human error caused by the work error of the measurement personnel, the time cost caused by the repeated observation of the measurement personnel, and the high labor cost caused by the high-precision measurement of the measurement personnel. The fixed end form mainly relies on the support for fixation, and has limited stiffness and stability, so the accurate position is easily affected by the site vibration such as concrete vibration.

[0005] If the fixed end form is adjusted to the end of the precast beam, the settlement influence of the measurement tower can be eliminated through the matching of the interval precast beam segment, and the influence of vibration on the matching accuracy can be reduced, thereby effectively solving the above accuracy problems. SUMMARY

[0006] To solve the above problems, the application provides a double-end synchronous matching short-line construction method for prefabricated bridge segments, which divides the beam manufacturing platform into five sub-areas, namely, a first prefabricated beam area, a matching cast-in-place area, a second prefabricated beam area, an independent cast-in-place area, and a transfer area.

[0007] To solve the above technical problems, the application adopts the technical scheme as follows:

[0008] A double-end synchronous matching short-line construction method for prefabricated bridge segments, which divides the beam manufacturing platform into five sub-areas, namely, a first prefabricated beam area, a matching cast-in-place area, a second prefabricated beam area, an independent cast-in-place area, and a transfer area.

[0009] A set of support frames are arranged in each sub-area, four tracks are arranged on the beam manufacturing platform, and a mobile trolley is arranged on each track. The four tracks are a first track connecting the independent cast-in-place area and the second prefabricated beam area, a second track penetrating the beam manufacturing matching area, a third track connecting the first prefabricated beam area and the transfer area, and a fourth track connecting the transfer area and the second prefabricated beam area. The four tracks form a circulating motion between the five sub-areas.

[0010] A measuring tower is arranged on one side of the beam manufacturing platform to position and measure the segment beams in the beam manufacturing matching area. The outside of the first prefabricated beam area of the beam manufacturing platform is a transfer road for parking vehicles for transferring segment beams.

[0011] The double-end synchronous matching short-line construction method comprises the following steps:

[0012] S1, first install the leveling device on the support frame of the independent cast-in-place area, cast in place the N section beam on the leveling device, remove the formwork after curing, so that the leveling device directly supports the N section beam, transport the N section beam and the leveling device at the bottom to the second precast beam area by the moving trolley, then further move the N section beam to the first precast beam area by the moving trolley as the first matching beam;

[0013] S2, prepare the N+2 section beam in the independent cast-in-place area in the same way as step S1, after curing, transfer the N+2 section beam and the leveling device at the bottom thereof to the second precast beam area by the moving trolley as the second matching beam;

[0014] S3, measure and position the first matching beam and the second matching beam by the measuring equipment on the observation tower, adjust the attitude and position of the corresponding section beam by the leveling device, and perform lofting matching work of the two matching beams by the short line matching method;

[0015] S4, hoist a leveling device on the support frame of the matching cast-in-place area, and install the inner formwork and the outer formwork of the N+1 section beam, cast in place the N+1 section beam; at the same time, hoist a leveling device on the support frame of the independent cast-in-place area, and install the inner formwork, the outer formwork and the end form of the N+4 section beam, and cast in place the N+4 section beam;

[0016] S5, when the N+1 section beam and the N+4 section beam are cured, perform section beam displacement; first transfer and transport the N section beam and the N+1 section beam by the moving trolley, remove the section beams in the transfer area to the beam storage area by other hoisting equipment or vehicles; the leveling device is recycled through the transfer area; then move the N+2 section beam to the first precast beam area as a new first matching beam; transport the N+4 section beam to the second precast beam area as a new second matching beam, and cyclically execute steps S3 to S5 until the precast work of all section beams is completed.

[0017] Further, in step S5, the specific method of section beam displacement is as follows:

[0018] S5.1, transfer of the N section beam, first move the N section beam and the leveling device at the bottom thereof in the first precast beam area together to the vicinity of the transfer road along the second track by the moving trolley, hoist the N section beam onto the transfer vehicle by the hoisting equipment on the external hoisting equipment or the transfer vehicle, and transfer to the beam storage area by the transfer vehicle; after the N section beam is hoisted away, the moving trolley returns to the first precast beam area with the leveling device thereon, and places the leveling device on the support frame of the first precast beam area; at the same time, the moving trolley on the third track transfers the leveling device in the first precast beam area to the support frame in the transfer area;

[0019] S5.2, the transfer of the N+1 segment beam, the matching cast-in-place area N+1 segment beam and the leveling device at the bottom thereof are moved together to the first precast beam area by the moving trolley on the second track, and continue to move along the second track to the vicinity of the transfer road, and are removed by the transfer vehicle, after which the moving trolley carries the leveling device thereon back to the first precast beam area and places the leveling device thereon on the support frame of the first precast beam area, and the second support frame of the matching cast-in-place area is empty;

[0020] S5.3, the first transfer of the N+2 segment beam, the N+2 segment beam of the second precast beam area and the leveling device at the bottom thereof are moved together to the matching cast-in-place area by the moving trolley on the second track, and the second precast beam area is empty;

[0021] S5.4, the transfer of the N+4 segment beam, the N+4 segment beam of the independent cast-in-place area and the leveling device at the bottom thereof are moved together to the second precast beam area by the moving trolley on the first track, as the second matching beam, and the independent cast-in-place area is empty; then the leveling device of the transfer area is transferred to the support frame of the independent cast-in-place area by the moving trolley on the fourth track, preparing for the preparation of the N+6 segment beam in the next round;

[0022] S5.5, the second transfer of the N+2 segment beam, first move the leveling device of the first precast beam area to the support frame of the transfer area by the moving trolley on the third track; then move the N+2 segment beam of the matching cast-in-place area and the leveling device at the bottom thereof together to the support frame of the first precast beam area by the moving trolley on the second track, and the matching cast-in-place area is empty;

[0023] S5.6, the leveling device of the transfer area is hoisted to the support frame of the matching cast-in-place area by the external hoisting equipment, preparing for the cast-in-place preparation of the N+3 segment in the next round.

[0024] Further, steps S5.1 and S5.2 in the segment beam shifting are improved as follows:

[0025] In step S5.1, when transferring the N segment beam, the moving trolley on the third track is used to transfer the N segment beam of the first precast beam area and the leveling device at the bottom thereof together along the third track to the support frame of the transfer area; then in the same way as the original step S5.1, the N segment beam of the transfer area and the leveling device at the bottom thereof are moved together to the vicinity of the transfer road by the moving trolley on the fourth track, the N segment beam is hoisted onto the transfer vehicle by the hoisting equipment on the external hoisting equipment or the transfer vehicle, and is transferred to the beam storage area by the transfer vehicle; the moving trolley on the fourth track carries the leveling device back to the support frame of the transfer area;

[0026] In step S5.2, after the N section beam is transferred away from the first precast beam area in step S5.1, the transfer of the N+1 section beam is started, the N+1 section beam and the leveling device at the bottom thereof in the matching cast-in-place area are moved to the first precast beam area by the moving trolley on the second track, and then are continuously moved to the vicinity of the transfer road, and are then carried away by the transfer vehicle, after that, the moving trolley on the second track returns to the first precast beam area with the leveling device thereon, and then the leveling device thereon is placed on the support frame in the first precast beam area, and the second support frame in the matching cast-in-place area is empty.

[0027] Further, the moving trolley moves the section beam as follows:

[0028] When a section beam needs to be moved, the moving trolley is moved to the corresponding section beam along the track, the section beam and the leveling device thereunder are lifted together by the lifting device on the moving trolley, and are separated from the support frame, the moving trolley carries the section beam to move, and when the section beam is moved to the destination, the lifting device is lowered, and the section beam and the leveling device thereunder are lowered together on the support frame.

[0029] Further, each of the tracks is a double track, that is, a group of tracks is formed by two parallel single tracks.

[0030] Further, the leveling device has four, which are respectively arranged below the first precast section beam, the first cast-in-place section beam, the second precast section beam and the second cast-in-place section beam.

[0031] Further, each group of support frames is a plurality of support columns arranged on both sides of the corresponding sub-area track.

[0032] Further, the moving trolley is provided with a lifting device at the top, which facilitates lifting the corresponding section beam to separate from the support frame for transfer.

[0033] Further, at the intersection of the third track and the fourth track, a rotating disc is arranged on the beam forming table in the transfer area, the third track and the fourth track at the edge of the rotating disc are disconnected, when the rotating disc is rotated by 90 degrees or a multiple of 90 degrees, the tracks in the rotating disc can be connected with the third track and the fourth track outside; the third track and the fourth track share one moving trolley, and the moving trolley can be switched on the third track and the fourth track by rotating on the rotating disc.

[0034] Further, the formwork of the first cast-in-place section beam includes an inner formwork and an outer formwork, and the opposite ends of the first precast section beam and the second precast section beam are used as end formworks.

[0035] The present application has the following advantages:

[0036] This invention discloses a short-line construction method for synchronous matching of precast bridge segments at both ends. It improves upon the traditional short-line method of matching "precast beam segment + cast-in-place segment + end face formwork" to a method of matching "precast beam segment + cast-in-place segment + precast beam segment," combined with the traditional cast-in-place method of "end face formwork + cast-in-place segment + end face formwork" at the side. This achieves synchronous casting of two beam segments. Furthermore, since the traditional method of cast-in-place method using "end face formwork + cast-in-place segment + end face formwork" at the side eliminates the need for high-precision matching and layout of beam segments, thus accelerating construction speed. Simultaneously, by using precast beam segments to match the intermediate cast-in-place beam segments at intervals, compared to the traditional method of matching precast segments with cast-in-place segments, the matching and layout length is longer, eliminating the impact of construction section vibration on the observation targets and improving the accuracy of the matching process. Furthermore, replacing the end formwork with precast beam segments results in greater weight and better stability, reducing errors caused by site vibration and deformation of the end formwork supports. The beam fabrication platform of this invention features a compact design, and the displacement of the beam segments on the platform can be achieved using a moving trolley without the need for external force, resulting in high construction efficiency. In summary, this invention features high construction precision, small beam segment matching error, fast construction speed, and low modification cost. It represents a technological innovation over the traditional short-line prefabrication construction process, making it highly competitive in the market and suitable for widespread application. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the prefabrication construction system structure of the bridge segment short-line method in Embodiment 1 of the present invention.

[0038] Figure 2 This is a schematic diagram of the prefabrication construction system for segmental beams in Embodiment 1 of the present invention.

[0039] Figure 3 This is a schematic diagram of the construction of the second cast-in-place segment beam in the independent cast-in-place zone in Embodiment 1 of the present invention.

[0040] Figure 4 This is a schematic diagram of the plan layout of the prefabricated construction system in Embodiment 1 of the present invention.

[0041] Figure 5 This is a schematic diagram of the plan layout of the prefabricated construction system in Embodiment 3 of the present invention.

[0042] Figure 6 This is a schematic diagram of the segmental beam prefabrication construction method in Embodiment 2 of the present invention.

[0043] Figure 7 A schematic diagram of the specific method for segmental beam displacement in step S5 of Embodiment 2 of the present invention.

[0044] 100-beam platform, 101-first precast beam area, 102-matching cast-in-place area, 103-second precast beam area, 104-independent cast-in-place area, 105-transfer area, 111-first track, 112-second track, 113-third track, 114-fourth track, 121-first support frame, 122-second support frame, 123-third support frame, 124-fourth support frame, 125-fifth support frame, 130-operating temporary support, 140-L-shaped platform, 150-formwork temporary support, 160-rotating disc, 210-1st segment beam, 220-2nd segment beam, 230-3rd segment beam, 250-5th segment beam, 221-inner formwork, 222-outer formwork, 223-end formwork, 300-leveling device, 400-measuring tower, 410-first mobile trolley, 420-second mobile trolley, 430-third mobile trolley, 440-fourth mobile trolley. DETAILED DESCRIPTION

[0045] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0046] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] As Figures 1 to 4 shown, example 1: the present application provides a precast construction system for bridge segment short line method, comprising

[0049] The beam manufacturing platform 100, which is a site or platform for segment beam manufacturing operation, comprises at least five sub-zones, i.e., a first precast beam zone 101, a matching cast-in-place zone 102, a second precast beam zone 103, an independent cast-in-place zone 104, and a transfer zone 105, wherein the first precast beam zone 101, the matching cast-in-place zone 102, and the second precast beam zone 103 are sequentially arranged to form a beam manufacturing matching zone; the first precast beam zone 101 and the second precast beam zone 103 are respectively used for placing matching beams (segment beams) that have been precast; the matching cast-in-place zone 102 is used for casting a first cast-in-place segment beam between two matching beams; the independent cast-in-place zone 104 is used for independently casting a second cast-in-place segment beam; and the transfer zone 105 is used for transferring the prepared segment beams or leveling devices;

[0050] The first precast beam zone 101 of the beam manufacturing platform 100 is outside a transfer road, which is used for parking a vehicle for transferring segment beams;

[0051] Five groups of support frames are arranged in each sub-zone and are used for supporting or temporarily supporting segment beams, i.e., a first support frame 121 arranged in the first precast beam zone, a second support frame 122 arranged in the matching cast-in-place zone 102, a third support frame 123 arranged in the second precast beam zone 103, a fourth support frame 124 arranged in the transfer zone 105, and a fifth support frame 125 arranged in the independent cast-in-place zone 104, which are respectively used for supporting segment beams in each sub-zone;

[0052] The four tracks are arranged on the beam manufacturing platform 100 and comprise a first track 111 connecting the independent cast-in-place zone 104 and the second precast beam zone 103, a second track 112 extending through the beam manufacturing matching zone, a third track 113 connecting the first precast beam zone 101 and the transfer zone 105, and a fourth track 114 connecting the transfer zone 105 and the independent cast-in-place zone 104, and the four tracks form a well shape with a loop, so that the leveling device 300 can form a circulating motion among the five sub-zones through the four tracks;

[0053] Three moving trolleys are arranged on each track and can move back and forth on the track, i.e., a first moving trolley 410 on the first track 111, a second moving trolley 420 on the second track 112, and a third moving trolley 430 on the third track 113;

[0054] Four leveling devices 300 are arranged at the bottom of the segment beam and are used for supporting the segment beam;

[0055] A measurement tower 400 is used for positioning and measuring the segment beam in the beam manufacturing matching zone.

[0056] In the precast construction system, the formwork for constructing the first cast-in-place segment beam comprises an inner formwork 221 and an outer formwork 222, and the opposite ends of the first precast segment beam and the second precast segment beam are used as end formworks.

[0057] The formwork for the second cast-in-place segment beam is a traditional formwork, including an inner formwork 221, an outer formwork 222, and end formwork 223 located at both ends. The end formwork 223 is installed on the beam-making platform 100 of the independent cast-in-place area 104 using a temporary formwork support 150. The outline shape of the end formwork 223 is the same as the end shape of the segment beam, and there are pressed-out convex and concave grooves on the surface for generating convex and concave teeth and prestressed duct holes in the precast beam segment.

[0058] As a preferred embodiment, the distribution of the beam fabrication platform 100 area is set as follows:

[0059] First, the beam-making platform 100 is divided into two horizontal areas. The left side is the beam-making matching area, and the right side is the cast-in-place transfer area 105. The beam-making matching area on the left is divided into the first precast beam area 101, the matching cast-in-place area 102, and the second precast beam area 103 in the longitudinal direction. The cast-in-place transfer area 105 on the right is divided into the transfer area 105 and the independent cast-in-place area 104 in the longitudinal direction. The independent cast-in-place area 104 is aligned with the second precast beam area 103, and the transfer area 105 is aligned with the first precast beam area 101. After being arranged according to the above track function layout principle, the four tracks form a grid-shaped circular motion track.

[0060] In a preferred embodiment, each track is a double track, consisting of two parallel single tracks forming a set of tracks. This improves the stability of the mobile trolley as it moves along the tracks.

[0061] In a preferred embodiment, the mobile trolley is equipped with a lifting device on its top to facilitate lifting the corresponding segment beams off the support frame for transfer. When moving segment beams using the mobile trolley, the lifting device raises the segment beams and their bottom leveling devices 300 together off the support frame, allowing them to move along the track. Upon reaching the destination, the lifting device lowers, placing the segment beams and their leveling devices 300 back onto the support frame. This method also allows for the separate transfer of the leveling devices 300.

[0062] It should be noted that the specific type of the mobile trolley in this invention is not limited; it can be any form of track trolley, as long as it has a lifting device on its top, which is generally a hydraulic cylinder. Generally, for ease of control, the mobile trolley is preferably an automatically controlled or remotely controlled track trolley. If automatic control is used, it can be fully automatically controlled by preset action types, travel distances, etc.

[0063] Example 2: As Figure 6 As shown, the method for prefabricating segmental beams using the prefabrication construction system of the present invention is as follows:

[0064] S1, such as Figure 6As shown in the middle A, in the initial state, there is no leveling device 300 on the support frame of the first prefabricated beam area 101, the matching cast-in-place area 102, the second prefabricated beam area 103, and the transfer area 105, the leveling device 300 is hoisted on the fifth support frame 125 of the independent cast-in-place area 104, the formwork is installed on the leveling device 300 hoisted on the fifth support frame 125 (using external hoisting equipment), and the Nth segment beam (N = 1) is prepared by using the independent cast-in-place area 104, after curing, the first moving trolley 410 is used to transport the first segment beam 210 and the leveling device 300 at the bottom of the first segment beam 210 together to the second prefabricated beam area 103, and then the second moving trolley 420 is used to further move the first segment beam 210 and the leveling device 300 at the bottom of the first segment beam 210 together to the first prefabricated beam area 101, and the first segment beam 210 is used as the first matching beam;

[0065] S2, as shown in Figure 6 As shown in the middle B, the leveling device 300 is hoisted again on the fifth support frame 125 of the independent cast-in-place area 104, and the N+2th segment beam (N = 1) is prepared by using the independent cast-in-place area 104, after curing, the first moving trolley 410 is used to transport the third segment beam 230 and the leveling device 300 at the bottom of the third segment beam 230 together to the second prefabricated beam area 103, and the third segment beam 230 is used as the second matching beam;

[0066] S3, the first matching beam (the first segment beam 210) and the second matching beam (the third segment beam 230) are measured and positioned by using the measuring equipment on the observation tower, and the lofting matching work of the two matching beams is carried out by using the short line matching method;

[0067] S4, as shown in Figure 6 As shown in the middle C, an external hoisting equipment is used to hoist a leveling device 300 on the second support frame 122 of the matching cast-in-place area 102, and the inner formwork and the outer formwork of the N+1th segment beam (N = 1) are installed on the leveling device 300 of the matching cast-in-place area 102, and the second segment beam 220 is prepared by cast-in-place; meanwhile, a new leveling device 300 is hoisted on the fifth support frame 125 of the independent cast-in-place area 104, and the inner formwork 221 and the outer formwork 222 of the N+4th segment beam (N = 1) and the end form are installed, and the fifth segment beam 250 is prepared by cast-in-place, at this time, four leveling devices 300 have been used, and the four leveling devices 300 are used in cycles;

[0068] S5, when the No. 2 segment beam 220 and the No. 5 segment beam 250 are completed, the segment beam is displaced, the No. 1 segment beam 210 and the No. 2 segment beam 220 are transferred to the vicinity of the transfer road outside the first precast beam area 101 by the moving trolley, and are transferred to the beam storage area by the transfer vehicle; the leveling device 300 lowered by the No. 1 segment beam 210 and the No. 2 segment beam 220 are sequentially used in circulation by the moving trolley through the third track 113 and the fourth track 114; then the No. 3 segment beam 230 is moved to the first precast beam area 101 as the first matching beam; the No. 5 segment beam 250 is transported to the second precast beam area 103 as the second matching beam. Steps S3 to S5 are executed in circulation until all segment beam precast work is completed.

[0069] As shown in Figure 4 , 6 and 7, in step S5, the specific method of segment beam displacement is as follows:

[0070] S5.1, transfer of the No. 1 segment beam 210, the initial state is shown in Figure 6 A, first, the No. 1 segment beam 210 in the first precast beam area 101 and the leveling device 300 at the bottom thereof are moved together along the second track 112 to the vicinity of the transfer road by the second moving trolley 420, the No. 1 segment beam 210 is hoisted onto the transfer vehicle by the hoisting equipment on the external hoisting equipment or the transfer vehicle, and is transferred to the beam storage area by the transfer vehicle; after the No. 1 segment beam 210 is hoisted away, the second moving trolley 420 returns to the first precast beam area 101 with the leveling device 300 thereon, and places the leveling device 300 on the first support frame 121 (the placement action can be completed by the recovery jacking device of the moving trolley), the second moving trolley 420 passes through the middle of the first support frame 121 from below to below the second support frame 122, preparing to transfer the No. 2 segment beam 220; at the same time, the third moving trolley 430 moves to below the first support frame 121, transfers the leveling device 300 thereon to the fourth support frame 124 in the transfer area, and the result is shown in Figure 7 A;

[0071] S5.2, transfer of the No. 2 segment beam 220, the No. 2 segment beam 220 in the matching cast-in-place area 102 and the leveling device 300 at the bottom thereof are moved together to the first precast beam area 101 by the second moving trolley 420, and are continuously moved to the vicinity of the transfer road along the second track 112, and are then removed by the transfer vehicle, after which the second moving trolley 420 returns to the first precast beam area 101 with the leveling device 300 thereon, and places the leveling device 300 on the first support frame 121, the second support frame 122 in the matching cast-in-place area 102 is empty, and the result is shown in Figure 7 B;

[0072] S5.3, the first transfer of the segment beam 230 of No. 3, through the second moving trolley 420 from below the second support frame 122 to below the third support frame 123, the jacking device on the second moving trolley 420 jacks up the segment beam 230 of No. 3 of the second precast beam area 103 and the leveling device 300 at the bottom thereof together, and moves to the matching cast-in-place area 102 to pause, temporarily places the segment beam 230 of No. 3 and the leveling device 300 at the bottom thereof on the second support frame 122, and the second precast beam area 103 has a vacancy, as shown in Figure 7 C in the middle;

[0073] S5.4, the transfer of the segment beam 250 of No. 5, through the first moving trolley 410 to move the segment beam 250 of No. 5 of the independent cast-in-place area 104 and the leveling device 300 at the bottom thereof together to the second precast beam area 103 as the second matching beam, the independent cast-in-place area 104 has a vacancy (without the leveling device 300); and then through the fourth moving trolley 440 to transfer the leveling device 300 on the fourth support frame 124 of the transfer area 105 to the fifth support frame 125 of the independent cast-in-place area 104, in preparation for the next round of segment beam preparation of No. 7, as shown in Figure 7 D in the middle;

[0074] S5.5, the second transfer of the segment beam 230 of No. 3, first through the third moving trolley 430 to move the leveling device 300 on the first support frame 121 to the fourth support frame 124 of the transfer area 105 for temporary storage; and then through the second moving trolley 420 to move the segment beam 230 of No. 3 of the matching cast-in-place area 102 and the leveling device 300 at the bottom thereof together to the first support frame 121 of the first precast beam area 101, the matching cast-in-place area 102 has a vacancy, as shown in Figure 7 E in the middle;

[0075] S5.6, through external hoisting equipment to hoist the leveling device 300 of the transfer area 105 to the matching cast-in-place area 102, in preparation for the next round of cast-in-place preparation of the segment beam of No. 4, as shown in Figure 7 F in the middle, that is, the state of Figure 6 B in the middle.

[0076] After all the segment beams are displaced, a new round of cast-in-place preparation of the segment beam of No. 4 and the segment beam of No. 7 can be carried out.

[0077] Embodiment 3: As a preferred embodiment, other than the same as Embodiment 2, the difference lies in that the steps S5.1 and S5.2 of the segment beam displacement in step S5 are different, since it takes a certain time and process to hoist the segment beam onto the transfer vehicle, in order to improve the transfer efficiency, the segment beam of No. 1 210 and the segment beam of No. 2 220 can be hoisted onto the transfer vehicle (two transfer vehicles or the same larger transfer vehicle) at the same time, and the specific improvement is as follows:

[0078] In step S5.1, when the No. 1 segment beam 210 is being transferred, the third moving trolley 430 is used to transfer the No. 1 segment beam 210 and the leveling device 300 at the bottom of the No. 1 segment beam 210 together along the third track 113 to the fourth support frame 124 of the transfer area 105; then, in the same way as in the original step S5.1, the fourth moving trolley 440 is used to move the No. 1 segment beam 210 and the leveling device 300 at the bottom of the No. 1 segment beam 210 together along the fourth track 114 to the vicinity of the transfer road, the No. 1 segment beam 210 is hoisted onto the transfer vehicle by the hoisting equipment on the transfer vehicle or external hoisting equipment, and is transferred to the beam storage area by the transfer vehicle; the fourth moving trolley 440 returns to the fourth support frame 124 of the transfer area 105 with the leveling device 300;

[0079] In step S5.2, after the No. 1 segment beam 210 is transferred away from the first precast beam area 101 in step S5.1, the transfer of the No. 2 segment beam 220 can be started, the No. 2 segment beam 220 and the leveling device 300 at the bottom of the No. 2 segment beam 220 matching the cast-in-place area 102 are moved to the first precast beam area 101 by the second moving trolley 420, and are continuously moved to the vicinity of the transfer road along the second track 112, and are then taken away by the transfer vehicle, after which the second moving trolley 420 returns to the first precast beam area 101 with the leveling device 300 thereon, and places the leveling device 300 thereon onto the first support frame 121, and the second support frame 122 of the cast-in-place area 102 is empty; in this way, the No. 1 segment beam 210 and the No. 2 segment beam 220 can be hoisted and loaded onto the vehicle at the same time, saving time.

[0080] Embodiment 4: other than the same as Embodiment 1, as shown in Figure 5 In the transfer area 105, the third track 113 and the fourth track 114 intersect at the beam manufacturing table 100, and the rotating disc 160 is arranged on the beam manufacturing table 100, the third track 113 and the fourth track 114 are disconnected at the edge of the rotating disc 160, and the tracks in the rotating disc 160 can be connected to the third track 113 and the fourth track 114 outside when the rotating disc 160 is rotated by 90 degrees or a multiple of 90 degrees; the third track 113 and the fourth track 114 share one moving trolley, and the moving trolley can be switched between the third track 113 and the fourth track 114 by rotating on the rotating disc 160, so that one moving trolley can be saved, greatly saving the cost.

[0081] As a specific embodiment, each group of support frames is a plurality of support columns arranged on both sides of the corresponding sub-area track, and in this embodiment, there are four support columns, and in fact, the number of support columns is not limited, and the support columns are distributed on both sides of the track without affecting the operation of the moving trolley.

[0082] As a preferred embodiment, the transfer zone 105 is provided with an operation temporary support 130, and an L-shaped platform 140 is arranged on the operation temporary support 130, which is used for operating the segmental beam of the five sub-zones, such as measuring and error elimination in the measuring process, artificial observation review and the like for the prefabricated segment, and template installation, observation point placement and the like for the cast-in-place segment.

[0083] It should be noted that the measuring tower 400 is the same as the measuring tower 400 used in the conventional short-line method construction, and a total station instrument can be used for measurement.

[0084] The pouring construction system uses the same equipment as the conventional short-line method construction.

[0085] The segmental beam is a prestressed reinforced concrete structure, which is mostly a box girder section, and a convex tooth block is arranged on one side end face, and a concave tooth pit is arranged on the other side end face, which are engaged with the tooth blocks (tooth pits) of the adjacent prefabricated beam segment, and are connected in series by prestressed steel strands to form an integral structure. Observation marks for position relationship matching are arranged on the top of the segmental beam, and are arranged in rows and columns around the centerline and contour line of the beam segment.

[0086] The above embodiments are only used for describing the present application, but not limiting the present application. Although the present application is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the present application, and should be covered in the scope of the claims of the present application.

Claims

1. A double-end-face synchronous matching short-line construction method of a prefabricated bridge segment, the beam fabrication platform is divided into five sub-zones, which are a first prefabricated beam zone, a matching cast-in-place zone, a second prefabricated beam zone, an independent cast-in-place zone and a transfer zone, wherein, The first prefabricated beam area, the matching cast-in-place area and the second prefabricated beam area are sequentially arranged to form a beam manufacturing matching area; the first prefabricated beam area and the second prefabricated beam area are respectively used for placing the prefabricated matching beams, the matching cast-in-place area is used for casting and manufacturing the first cast-in-place segment beam between the two matching beams, the independent cast-in-place area is used for independently casting and manufacturing the second cast-in-place segment beam, and the transfer area is used for transferring the manufactured segment beam; A set of support frames are arranged in each sub-area; four tracks are arranged on the beam manufacturing platform, and a moving trolley is arranged on each track; the four tracks are respectively a first track connecting the independent cast-in-place area and the second prefabricated beam area, a second track penetrating through the beam manufacturing matching area, a third track connecting the first prefabricated beam area and the transfer area, and a fourth track connecting the transfer area and the independent cast-in-place area, and the four tracks form a circulating movement between the five sub-areas; A measuring tower is arranged on one side of the beam manufacturing platform, and is used for positioning and measuring the segment beam in the beam manufacturing matching area; an outside of the first prefabricated beam area of the beam manufacturing platform is a transfer road, and is used for parking a vehicle transferring the segment beam; The double-end-face synchronous matching short-line construction method comprises the following steps: S1, first, a leveling device is installed on the support frame of the independent cast-in-place area, N-number segment beams are cast in place on the leveling device, the formwork is removed after curing, the leveling device directly supports the N-number segment beams, the N-number segment beams and the bottom leveling device are transported to the second prefabricated beam area by the moving trolley, and then the N-number segment beams are further moved to the first prefabricated beam area as the first matching beam by the moving trolley; S2, N+2-number segment beams are prepared in the independent cast-in-place area in the same way as step S1, and after curing, the N+2-number segment beams and the leveling device at the bottom thereof are transferred to the second prefabricated beam area as the second matching beam by the moving trolley; S3, the measuring equipment on the observation tower is used to measure and position the first matching beam and the second matching beam, the posture and position of the corresponding segment beam are adjusted by using the leveling device, and the lofting matching work of the two matching beams is performed by using the short-line matching method; S4, a leveling device is hoisted on the support frame of the matching cast-in-place area, and the inner formwork and the outer formwork of the N+1-number segment beam are installed, and the N+1-number segment beam is cast in place; meanwhile, a leveling device is hoisted on the support frame of the independent cast-in-place area, and the inner formwork, the outer formwork and the end form of the N+4-number segment beam are installed, and the N+4-number segment beam is cast in place; S5, when the N+1-number segment beam and the N+4-number segment beam are cured, the segment beam is displaced; the N-number segment beam and the N+1-number segment beam are first transferred and removed by the moving trolley, the segment beam in the transfer area is removed to the beam storage area by other hoisting equipment or vehicles; the leveling device is recycled through the transfer area; then the N+2-number segment beam is moved to the first prefabricated beam area as a new first matching beam; the N+4-number segment beam is transported to the second prefabricated beam area as a new second matching beam, and steps S3 to S5 are cyclically executed until the prefabrication of all segment beams is completed.

2. The double-shouldered synchronous matching short-line construction method of claim 1, wherein: In step S5, the specific method of segment beam displacement is as follows: S5.1, the transfer of the N segment beam, first use the moving trolley along the second track to move the N segment beam of the first precast beam area and the leveling device at the bottom thereof to the vicinity of the transfer road, hoist the N segment beam to the transfer vehicle by the external hoisting equipment or the hoisting equipment on the transfer vehicle, and transfer to the beam storage area by the transfer vehicle; after the N segment beam is hoisted away, the moving trolley carries the leveling device on it back to the first precast beam area and places the leveling device on the support frame of the first precast beam area; at the same time, the moving trolley on the third track transfers the leveling device of the first precast beam area to the support frame of the transfer area; S5.2, the transfer of the N+1 segment beam, move the N+1 segment beam matched with the cast-in-place area and the leveling device at the bottom thereof together to the first precast beam area by the moving trolley on the second track, and continue to move along the second track to the vicinity of the transfer road, and then move away by the transfer vehicle, after that, the moving trolley carries the leveling device on it back to the first precast beam area and places the leveling device on the support frame of the first precast beam area, and the second support frame of the cast-in-place area is empty; S5.3, the first transfer of the N+2 segment beam, move the N+2 segment beam of the second precast beam area and the leveling device at the bottom thereof together to the cast-in-place area matched with the second precast beam area for temporary storage, and the second precast beam area has an empty space; S5.4, the transfer of the N+4 segment beam, move the N+4 segment beam of the independent cast-in-place area and the leveling device at the bottom thereof together to the second precast beam area by the moving trolley on the first track, as the second matched beam, and the independent cast-in-place area has an empty space; then transfer the leveling device of the transfer area to the support frame of the independent cast-in-place area by the moving trolley on the fourth track, and prepare for the preparation of the N+6 segment beam in the next round; S5.5, the second transfer of the N+2 segment beam, first move the leveling device of the first precast beam area to the support frame of the transfer area for temporary storage by the moving trolley on the third track; then move the N+2 segment beam matched with the cast-in-place area and the leveling device at the bottom thereof together to the support frame of the first precast beam area by the moving trolley on the second track, and the cast-in-place area has an empty space; S5.6, hoist the leveling device of the transfer area to the support frame of the cast-in-place area matched with the second precast beam area by the external hoisting equipment, and prepare for the cast-in-place preparation of the N+3 segment beam in the next round.

3. The double-shouldered synchronous matching short-line construction method of claim 2, wherein: The steps S5.1 and S5.2 in the segment beam displacement are improved as follows: In step S5.1, when transferring the N segment beam, the moving trolley on the third track is used to transfer the N segment beam of the first precast beam area and the leveling device at the bottom thereof together along the third track to the support frame of the transfer area; then, in the same way as the original step S5.1, the moving trolley on the fourth track is used to move the N segment beam of the transfer area and the leveling device at the bottom thereof together to the vicinity of the transfer road, hoist the N segment beam to the transfer vehicle by the external hoisting equipment or the hoisting equipment on the transfer vehicle, and transfer to the beam storage area by the transfer vehicle; the moving trolley on the fourth track carries the leveling device back to the support frame of the transfer area; In step S5.2, after the Nth segmental beam is transferred away from the first precast beam area in step S5.1, the transfer of the (N+1)th segmental beam is started. The mobile trolley on the second track moves the (N+1)th segmental beam and its leveling device on the cast-in-place area to the first precast beam area, and continues to move along the second track to the vicinity of the transfer road, and is then carried away by the transfer vehicle. Then the mobile trolley on the second track returns to the first precast beam area with the leveling device, and places the leveling device on the support frame in the first precast beam area. The second support frame in the cast-in-place area is empty.

4. The double-shouldered synchronous matching short-line construction method according to claim 2 or 3, characterized in that: The method of moving the segmental beam by the mobile trolley is as follows: When a segmental beam needs to be moved, the mobile trolley is moved to the corresponding segmental beam along the track, and the segmental beam and its leveling device are lifted together by the lifting device on the mobile trolley, and are separated from the support frame. The mobile trolley carries the segmental beam to move, and when it reaches the destination, the lifting device lowers the segmental beam and its leveling device together and places them on the support frame.

5. The double-shouldered synchronous matching short-line construction method according to claim 2 or 3, characterized in that: Each track is a double track, that is, a set of tracks is formed by two parallel single tracks.

6. The double-shouldered synchronous matching short-line construction method according to claim 2 or 3, characterized in that: The leveling device has four, respectively, set in the first precast segmental beam, the first cast-in-place segmental beam, the second precast segmental beam and the second cast-in-place segmental beam.

7. The double-shouldered synchronous matching short-line construction method according to claim 2 or 3, characterized in that: Each set of support frames is a plurality of support columns arranged on both sides of the corresponding sub-area track.

8. The double-shouldered synchronous matching short-line construction method according to claim 2 or 3, characterized in that: The formwork of the first cast-in-place segmental beam includes an inner formwork and an outer formwork, and the opposite ends of the first precast segmental beam and the second precast segmental beam are used as end formworks.

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