Cantilever cast-in-place bridge builder and construction method thereof

Abstract

The application provides a cantilever cast-in-situ bridge machine and a construction method thereof, which comprises a main truss, an outer mold system, an inner mold system, a rear anchor system, a supporting trolley and a formwork hanger, two or more groups of supporting trolleys are installed at the bottom of the main truss and are arranged in a lifting structure; the formwork hanger comprises a hanger body and a supporting rod connected to the bottom of the hanger body, the hanger body is slidingly installed at the top of the main truss, and the supporting rod is arranged in a lifting structure; a horizontal inner mold bracket is arranged at the lower part of the front end of the hanger body, the inner mold bracket supports the top mold plate of the inner mold system, and the rear end of the inner mold bracket is hung on the cast box girder; horizontal wing mold brackets are arranged at the lower parts of the two sides of the hanger body, the two wing mold brackets are oppositely arranged, the outer mold system is hung on the hanger body and the cast box girder, and the two wing mold brackets are supported at the bottom of the flange plate of the outer mold system. The main truss, the outer mold system and the inner mold system can be stepwise overpunched, and the overpunching safety is high.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a cantilever cast-in-place bridge construction machine and its construction method. Background Technology

[0002] With the rapid development of high-speed railway construction, the design and application of long-span continuous beam structures are becoming increasingly widespread, and continuous beam bridges account for a large proportion of bridge construction. The main construction methods for continuous beam bridges include cast-in-place scaffolding, cantilever casting, cantilever assembly, and incremental launching. Among these, the cantilever casting process avoids the need for numerous scaffolding structures and large lifting equipment, thus accelerating construction progress. It is particularly advantageous in situations involving high piers, deep water, and conditions where traffic disruption is not feasible. The main equipment used in the cantilever casting method is the formwork, which has been widely applied in the construction of continuous beams, T-shaped rigid frames, and continuous rigid frames. In the construction of continuous beams, segmental casting is often employed. After the segmental reinforcement is tied on the formwork, the segmental concrete is poured. However, with existing diamond-shaped formwork, the entire formwork carries the formwork through the span, and if the track and box girder are not properly anchored, the main structure is prone to overturning. Summary of the Invention

[0003] To address the aforementioned shortcomings in the existing technology, this invention provides a cantilever cast-in-place bridge construction machine and its construction method, which enables the main truss, outer formwork system, and inner formwork system to pass through the hole in stages. When the main truss passes through the hole, the outer formwork system and inner formwork system are fixed, and when the outer formwork system and inner formwork system pass through the hole, the main truss is fixed. This ensures high safety during the hole passage and avoids the problem of the cantilever cast-in-place bridge construction machine overturning during the hole passage process. Furthermore, it eliminates the need to anchor the rear end of the main truss, saving labor.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this invention is as follows:

[0005] A cantilever cast-in-place bridge construction machine includes at least a main truss, an outer formwork system, an inner formwork system, a rear anchor system, auxiliary mechanisms, and an electro-hydraulic system. The cantilever cast-in-place bridge construction machine further includes:

[0006] Support trolleys are installed at the bottom of the main truss in two or more sets. The support trolleys are designed to be liftable, so that the main truss can be supported or detached from the cast box girder.

[0007] The formwork hanger includes a hanger body and support rods connected to the bottom of the hanger body. The hanger body is slidably installed on the top of the main truss, allowing the hanger body and the main truss to slide relative to each other in the longitudinal direction. The support rods are configured as liftable structures, allowing the support rods to be supported or detached from the cast-in-place box girder. A horizontal inner formwork bracket is provided at the lower front end of the hanger body, which supports the top formwork of the inner formwork system. The rear end of the inner formwork bracket is suspended on the cast-in-place box girder. Horizontal wing formwork brackets are provided at the lower sides of the hanger body, with the two wing formwork brackets facing each other. The outer formwork system is suspended on the hanger body and the cast-in-place box girder, with the two wing formwork brackets supporting the bottom of the flange plates of the outer formwork system.

[0008] The top of each wing mold bracket is provided with a transverse track along the lateral direction, and the bottom of the wing plate is provided with a transverse wheel set. The transverse wheel set is connected to the transverse track, so that the wing plate moves laterally along the wing mold bracket.

[0009] The front end of the bottom formwork of the outer formwork system is suspended on the main body of the hanger via the front suspension point assembly; the rear end of the bottom formwork of the outer formwork system is suspended on the main body of the hanger and the already poured box girder via the side rear suspension point assembly and the middle rear suspension point assembly, respectively.

[0010] The number and position of the inner mold brackets match the number and position of the inner mold system.

[0011] The bottom of the main body of the hanger is equipped with a reverse hanging device and a sliding pair. The reverse hanging device is reversed and hung on the main truss, and the sliding pair is slidably connected to the guide rail set on the top of the main truss, so that the main body of the hanger is slidably connected to the main truss. A longitudinal movement cylinder is connected between the main body of the hanger and the main truss. The longitudinal movement cylinder extends and retracts, causing the main body of the hanger and the main truss to slide relative to each other in the longitudinal direction.

[0012] Each support rod includes an upper rod body and a helical column foot. The bottom of the upper rod body is provided with a threaded hole, and the outer surface of the upper part of the helical column foot is provided with a corresponding thread. By adjusting the connection length of the helical column foot in the threaded hole, the length of the entire support rod can be adjusted, thereby enabling the support rod to support or detach from the cast box girder.

[0013] The main truss includes multiple main longitudinal beams and connecting beams connecting the multiple main longitudinal beams. The number and position of the main longitudinal beams match the number and position of the box girder web.

[0014] Each set of supporting trolleys includes a trolley crossbeam and lifting cylinders. The trolley crossbeam is connected to the bottom of the main truss. Two sets of lifting cylinders are symmetrically installed at the bottom of the trolley crossbeam along the longitudinal central axis. The lifting cylinders lift or retract, thereby supporting or detaching the main truss from the cast box girder.

[0015] The support trolley is slidably connected to the main truss, allowing the support trolley and the main truss to slide relative to each other in the longitudinal direction.

[0016] Two sets of hanging wheels A and two sets of pulleys A are symmetrically installed on the top of the trolley beam along the longitudinal central axis. The two sets of hanging wheels A are hung upside down on the main truss, so that the two sets of pulleys A are slidably connected to the guide rails set at the bottom of the main truss, thereby making the supporting trolley slidably connected to the main truss.

[0017] The rear anchoring system is provided in multiple sets at the rear end of the main truss. The number and position of the rear anchoring system match the number and position of the box girder web. Each set of rear anchoring system includes an upper crossbeam, a lower suspension beam, and anchor rods. The upper crossbeam is fixed to the top of the main truss. There are two lower suspension beams, which are connected to the lower ends of the upper crossbeam by pin shaft assemblies. Both lower suspension beams are set longitudinally. There are four sets of anchor rods. The upper ends of the four sets of anchor rods are respectively anchored to the two ends of the two lower suspension beams, and the lower ends of the four sets of anchor rods are anchored to the top plate of the cast box girder.

[0018] The present invention also provides a construction method for a cantilever cast-in-place bridge construction machine, including the following steps: S1, after the concrete pouring of the box girder segment is completed and the segment concrete strength reaches the standard, the tie rods of the inner formwork system and the outer formwork system are released, the inner side template of the inner formwork system is loosened, and permanent prestressing is applied to the segment concrete.

[0019] S2. The support rods of the formwork hanger are supported on the already poured box girder, and the connection between the outer formwork system and the inner formwork bracket and the already poured box girder is removed;

[0020] S3. Remove the connection between the rear anchor system and the cast box girder, and retract the support trolley to detach the main truss from the cast box girder.

[0021] S4. The longitudinal movement cylinder on the formwork hanger is activated, causing the main truss and the support trolley to move forward longitudinally into place.

[0022] S5. After the main truss is moved into position, the support trolley is lifted up so that the main truss is supported on the cast box girder. The rear anchor system is then anchored to the cast box girder, and the support rods of the formwork hanger are retracted and released.

[0023] S6. The support trolley descends as a whole, unloading and demolding the inner and outer mold systems together.

[0024] S7. The longitudinal movement cylinder on the formwork hanger is activated, and the formwork hanger moves forward longitudinally, driving the outer mold system and the inner mold system to move forward longitudinally into place together;

[0025] S8. Raise the support trolley to adjust the height of the formwork to a suitable elevation, then remove the connecting parts of the bottom formwork and the outer formwork of the outer formwork system, and raise the bottom formwork to the construction height to meet the construction needs of the next segment.

[0026] S9. Precisely adjust the height and position of the formwork bed, install the connection between the outer formwork system and inner formwork bracket removed in step S2 and the already poured box girder, and prepare for the next segment construction.

[0027] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0028] 1. In this invention, the outer mold system and the inner mold system are suspended below the formwork hanger, so that the main truss and the outer and inner mold systems can pass through the hole in stages through the alternating operation between the support trolley and the support rods of the formwork hanger. That is, when the main truss passes through the hole, the outer mold system and the inner mold system are fixed on the formwork hanger and supported on the cast box girder; when the outer mold system and the inner mold system pass through the hole, the main truss is supported and fixed on the cast box girder, which ensures high safety during the hole passage.

[0029] 2. In this invention, when the outer mold system and the inner mold system pass through the hole, the rear end of the main truss is first anchored by the rear anchor system. The overturning effect of the outer mold system on the main truss is very small, and there is no need to anchor the support trolley to the cast box girder. The hole-passing operation is simple.

[0030] 3. In this invention, the outer formwork system is suspended on the main body of the hanger and the already cast box girder, and the formwork hanger is connected to the wing formwork bracket for supporting the flange plate of the outer formwork system; the inner formwork system is supported by the inner formwork bracket, and the rear end of the inner formwork bracket is suspended on the already cast box girder, ensuring the suspension stability of the inner formwork system and the outer formwork system and high construction safety; the inner formwork system and the outer formwork system pass through the hole together, making construction efficient.

[0031] 4. The wing formwork bracket of the cantilever cast-in-place bridge construction machine provided by the present invention supports the wing plate of the outer formwork system, and the wing plate is slidably connected to the wing formwork bracket. When the formwork bed is lowered and demolded, if the outer template of the outer formwork system is too tightly attached to the already poured concrete beam and it is not convenient to pass through the hole forward, the wing plate can be opened laterally to ensure that the formwork bed passes through the hole without obstruction. Attached Figure Description

[0032] Figure 1 This is a side view of the cantilever cast-in-place bridge construction machine under the casting state provided by the present invention;

[0033] Figure 2 This is a cross-sectional view of the front lifting point system of the cantilever cast-in-place bridge construction machine provided by the present invention during the casting process;

[0034] Figure 3 This is a cross-sectional view of the cantilever cast-in-place bridge construction machine provided by the present invention at the rear lifting point system during the casting process;

[0035] Figure 4 This is a schematic diagram of the main truss structure in this invention, wherein (a) is a top view, (b) is a side view, (c) is a cross-sectional view of the rear end of the main truss, and (d) is a cross-sectional view of the front end of the main truss.

[0036] Figure 5 This is a schematic diagram of the supporting trolley in the present invention, wherein (a) is the front view, (b) is the top view, and (c) is the side view;

[0037] Figure 6 This is a top view of the template hanger in this invention;

[0038] Figure 7 This is a cross-sectional view of the template hanger at the front suspension beam in this invention;

[0039] Figure 8 This is a cross-sectional view of the template hanger at the rear suspension beam in this invention;

[0040] Figure 9 for Figure 7 Schematic diagram of the cross section at point AA;

[0041] Figure 10 for Figure 7 Schematic diagram of the cross section at point BB;

[0042] Figure 11 This is a side view showing the connection of the inner mold bracket, inner mold system, and inner mold lifting point assembly in this invention.

[0043] Figure 12 This is a side view of the template hanger in this invention;

[0044] Figure 13 This is a top view of the wing mold bracket in this invention;

[0045] Figure 14 This is a cross-sectional view of the cantilever cast-in-place bridge construction machine under the casting state at the rear anchor system, provided by the present invention.

[0046] Figure 15 This is a front view of the rear anchor system in this invention;

[0047] Figure 16 This is a side view of the rear anchor system in this invention;

[0048] Figure 17 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 1 ;

[0049] Figure 18 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 2 ;

[0050] Figure 19 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 3 ;

[0051] Figure 20 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 4 ;

[0052] Figure 21 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 5 ;

[0053] Figure 22 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 6 ;

[0054] Figure 23 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 7 ;

[0055] Figure 24 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 8 ;

[0056] Figure 25 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 9 ;

[0057] Figure 26 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 10 ;

[0058] Figure 27 This is a schematic diagram of the construction method of the cantilever cast-in-place bridge building machine in this invention. Figure 10 one;

[0059] In the diagram: 1-Main truss, 11-Main longitudinal beam, 12-Connecting beam, 2-Support trolley, 21-Trolley crossbeam, 22-Hanging device A, 23-Sliding pair A, 24-Lifting cylinder, 3-Inner formwork system, 31-Top formwork, 32-Inner side formwork, 4-Outer formwork system, 41-Flange plate, 42-Outer side formwork, 43-Bottom formwork, 44-Bottom formwork protection platform, 5-Formwork hanger, 51-Hanger body, 511-Front hanger beam, 512-Rear hanger beam, 513-Longitudinal connecting beam, 514-Hanging device B, 515-Sliding pair B, 52-Support rod, 521-Upper rod body, 522-Spiral column base, 53-Longitudinal... 54-Moving cylinder, 541-Moving bracket crossbeam, 542-Moving bracket longitudinal beam, 55-Moving bracket lifting beam, 56-Wing mold bracket, 561-Transverse track, 57-Wing mold bracket lifting beam, 61-Moving rod of inner mold, 71-Front inner side lifting rod, 72-Front outer upper lifting rod, 73-Front outer lower lifting rod, 74-Rear side upper lifting rod, 75-Rear side lower lifting rod, 76-Middle rear lifting rod, 8-Rear anchor system, 81-Upper crossbeam, 82-Lower lifting beam, 83-Anchor rod, 84-Pin assembly, 841-Ear plate, 842-Pin, 843-Shaft end clamping plate, 85-Inclined pad, 9-Auxiliary mechanism, 10-Cast box girder. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0061] The structure of the cantilever cast-in-place bridge construction machine provided by this invention is as follows: Figures 1-3 As shown, the cantilever cast-in-place bridge construction machine includes a main truss 1, a support trolley 2, an inner formwork system 3, an outer formwork system 4, a formwork hanger 5, a rear anchor system 8 for anchoring the rear end of the main truss, auxiliary mechanisms 9, and an electro-hydraulic system. In this embodiment, the inner and outer formwork systems are suspended from the formwork hanger and the already cast box girder. The box girder in this embodiment is a single-span box girder. It should be noted that the cantilever cast-in-place bridge construction machine provided by this invention is also applicable to double-span or multi-span box girders.

[0062] The structure of the main truss is as follows Figure 4 As shown, the structure includes two main longitudinal beams 11 and a connecting beam 12 between them. The main longitudinal beams serve as track beams for supporting the trolley and formwork hangers, connecting them as described later. The positions of the main longitudinal beams correspond to the positions of the webs of the single-span box girder. Figure 2 Furthermore, the main longitudinal beams and connecting beams adopt a box-type structure. A connecting beam is connected to the upper and lower parts of the front end of the two main longitudinal beams, and a connecting beam is connected to the rear end of the two main longitudinal beams to ensure the stability of the main truss.

[0063] Two or more sets of support trolleys are installed at the bottom of the main truss. In this embodiment, two sets of support trolleys are provided, see... Figure 1 Two sets of support trolleys are located at the front end of the cast-in-place beam segment and the rear end of the main truss, respectively. The support trolleys are configured with a lifting structure, allowing the main truss to be supported or detached from the cast-in-place box girder 10. Specifically, each set of support trolleys includes a trolley crossbeam 21 and a lifting cylinder 24. The trolley crossbeam is connected to the bottom of the main truss, and the lifting cylinder is connected to the bottom of the trolley crossbeam. The lifting cylinder lifts or retracts, thereby allowing the main truss to be supported or detached from the cast-in-place box girder. In this embodiment, the length of the trolley crossbeam matches the transverse width of the main truss, see [reference needed]. Figure 3 Multiple sets of lifting cylinders are installed at the bottom of the trolley beam to ensure that the supporting trolley can provide overall support for the main truss and maintain good stability.

[0064] In this embodiment, the support trolley is slidably mounted at the bottom of the main truss, allowing the support trolley and the main truss to slide relative to each other longitudinally, facilitating adjustment of the support position of the support trolley. Specifically, the top of the trolley crossbeam is connected to an anti-hanging device A22 and a sliding pair A23, as shown below. Figure 5As shown, the anti-hanging device A is anti-hanging on the main truss (i.e., on the lower flange plate of the main longitudinal beam of the main truss), so that the sliding pair A is slidably connected to the guide rail set at the bottom of the main truss (i.e., at the bottom of the main longitudinal beam of the main truss), thereby making the support trolley slidably connected to the main truss. Further, multiple sets of anti-hanging devices A and sliding pairs A are provided. In this embodiment, two sets of anti-hanging devices A and sliding pairs A are symmetrically installed along the longitudinal central axis at the top of the trolley crossbeam. Specifically, each set of anti-hanging devices A includes two anti-hanging devices A that are anti-hanging on the inner side of the main longitudinal beam in parallel along the longitudinal direction, each set of sliding pairs A includes sliding pairs A connected to both sides of the bottom of the main longitudinal beam, and each set of lifting cylinders includes two lifting cylinders that are connected to the bottom of the main longitudinal beam in parallel along the longitudinal direction.

[0065] The internal formwork system includes a top formwork 31 and inner formwork 32 connected to both sides of the top formwork. The top formwork and inner formwork are connected to form a portal structure adapted to the box girder opening, see [link / details]. Figure 2 Once the poured concrete reaches a certain strength, the inner formwork of the inner formwork system can be loosened and bent inwards for fixation. After the top formwork is demolded, the inner formwork system passes through the hole along with the inner formwork bracket. Wooden formwork is used for sections of the inner formwork system that require height adjustment, and can be combined and used according to different internal cavity heights, making it highly practical. The outer formwork system includes flange plates 41, outer formwork 42, bottom formwork 43, and a bottom formwork protection platform 44. The flange plates, outer formwork, and bottom formwork are connected to form a structure that matches the sides and bottom of the box girder. The bottom formwork protection platform is connected around the bottom formwork. Specifically, the outer formwork system uses an outer formwork wrapping around the bottom formwork, which facilitates adjusting the height of the bottom formwork to adapt to the parabolic control of the concrete beam bottom slab. In the pouring state, the inner formwork of the inner formwork system and the outer formwork of the outer formwork system are fixed together by tension, as shown in the figure. Figure 2 In this embodiment, the box girder structure is a single-hole structure, and one set of inner mold system and one set of outer mold system are provided respectively.

[0066] The formwork support system includes a main support body 51, support rods 52, an inner formwork bracket 54, and a wing formwork bracket 56, as shown below. Figures 6-12 As shown. The main body of the hanger is slidably installed on the top of the main truss, allowing the hanger body and the main truss to slide relative to each other longitudinally. Specifically, the hanger body includes a front hanger beam 511 and a rear hanger beam 512 arranged transversely, and a longitudinal connecting beam 513 connecting the front hanger beam and the rear hanger beam. Further, longitudinal connecting beams are provided at the connection points of the support rod, the inner mold bracket, and the wing mold bracket with the hanger body, as shown. Figure 6 In this embodiment, two sets of reverse-hanging devices B514 and two sets of sliding pairs B515 are symmetrically installed along the longitudinal central axis at the bottom of both the front and rear suspension beams. The reverse-hanging devices B are reverse-hanging on the main truss (i.e., on the upper flange plate of the main longitudinal beam of the main truss), so that all four sets of sliding pairs B are slidably connected to the guide rails set at the top of the main truss (i.e., at the top of the main longitudinal beam of the main truss), thereby making the main body of the suspension frame slidably connected to the main truss. See Figure 7 and Figure 8Specifically, each set of anti-hanging devices B includes two anti-hanging devices B that are anti-hanging on both sides of the main longitudinal beam, and each set of sliding pairs B includes two sliding pairs B connected to both sides of the bottom of the main longitudinal beam. In this embodiment, a longitudinal movement cylinder 53 is connected between the hanger body and the main truss, see... Figure 1 The longitudinal movement cylinders extend and retract, causing the main body of the hanger and the main truss to slide relative to each other in the longitudinal direction. Specifically, there are two longitudinal movement cylinders. One end of each cylinder is fixed to the outer surface of the two main longitudinal beams, and the other end is fixed to the side of the longitudinal connecting beam of the hanger body.

[0067] In this embodiment, two sets of support rods are symmetrically arranged along the longitudinal central axis at the bottom of the main body of the hanger, see... Figure 7 and Figure 8 The support rods are designed to be liftable, allowing them to be supported or detached from the cast-in-place box girder. In this embodiment, two sets of support rods are located on the outer sides of the main truss. Each set of support rods includes two support rods arranged side-by-side along the longitudinal direction. One support rod is connected to the bottom of the rear suspension beam, and the other support rod is connected to the bottom of the longitudinal connecting beam near the end of the front suspension beam. Figure 9 As shown. Each support rod includes an upper rod body 521 and a helical column foot 522. The helical column foot is threaded to the bottom of the upper rod body. Specifically, the bottom of the upper rod body is provided with a threaded hole, and the outer surface of the upper part of the helical column foot is provided with a corresponding thread. By adjusting the connection length of the helical column foot in the threaded hole, the length of the entire support rod is adjusted, thereby enabling the support rod to support or detach from the cast box girder.

[0068] The inner mold bracket is horizontally positioned and suspended from the lower front end of the main frame via the inner mold bracket suspension beam 55, thus supporting the inner mold system. The number and position of the inner mold brackets match the number and position of the inner mold system. Specifically, the inner mold bracket includes a bracket crossbeam 541 and a bracket longitudinal beam 542, such as... Figure 7 and Figure 10 As shown, the bracket longitudinal beam and bracket transverse beam are connected to form a bracket frame. The bracket frame is horizontally connected to the bottom of the inner mold bracket lifting beam and faces the rear end of the lifting body. The bracket frame is bolted to the bottom of the top template of the inner mold system, thus lifting the inner mold system. Figure 2 Furthermore, the inner mold bracket has two hanging beams, two cross beams, and two longitudinal beams. The two inner mold bracket hanging beams are connected to the bottom of the main body of the bracket, the two longitudinal beams are connected to the bottom of the two inner mold bracket hanging beams, and the two cross beams are connected to the two ends of the two longitudinal beams, ensuring the stability of the entire inner mold bracket.

[0069] The inner formwork bracket extends from the rear end of the inner formwork system and is suspended from the cast-in-place box girder via the inner formwork lifting point assembly, see... Figure 1 , Figure 3 and Figure 11The inner formwork lifting assembly includes vertically arranged inner formwork lifting rods 61. Two sets of inner formwork lifting rods are distributed at the rear end of the inner formwork bracket. The upper part of the inner formwork lifting rods is anchored to the top slab of the already cast box girder, and the lower part of the inner formwork lifting rods is anchored to the bracket crossbeam at the rear end of the inner formwork bracket. (See...) Figure 11 During the pouring process, the inner formwork bracket is anchored and suspended. When passing through the hole, the inner formwork lifting point assembly at the rear end of the inner formwork bracket is removed. Figure 19 As shown.

[0070] Two wing formwork brackets are horizontally installed and connected to the lower sides of the main body of the hanger via wing formwork bracket suspension beam 57. The two wing formwork brackets are arranged opposite each other. See Figure 7 and Figure 8 Two wing mold brackets support the bottom of the outer mold system's flange plate and connect to it. Each set of wing mold bracket lifting beams includes two wing mold bracket lifting beams, respectively connected to the bottom of the front and rear lifting beams, such as... Figure 12 As shown. The wing mold bracket is a rectangular frame structure, as... Figure 13 As shown. In this embodiment, each wing mold bracket has a transverse track 561 arranged at its top along the lateral direction, see... Figure 12 and Figure 13 A set of transverse wheels is correspondingly provided at the bottom of the flange plate, and the transverse wheels are connected to the transverse rails, allowing the flange plate to move laterally along the wing mold bracket. Furthermore, three transverse rails are provided at the top of each wing mold bracket, with the number of transverse wheels corresponding to the arrangement. In this embodiment, the flange plate of the outer mold system can be laterally opened by 100mm on the wing mold bracket. If, after the mold bed is lowered and demolded, the outer template of the outer mold system is too tightly fitted to the already poured concrete beam, making it difficult to pass through the hole forward, the flange plate can be opened laterally to ensure that the mold bed passes through the hole without obstruction.

[0071] The external formwork system is suspended from the main body of the hanger and the already poured box girder. The front end of the bottom formwork of the external formwork system is suspended from the main body of the hanger via the front lifting point assembly. See Figure 1 and Figure 2The front suspension point assembly includes a vertically arranged inner front suspension rod 71 and an outer front suspension rod. The inner front suspension rod is located on one side of the box girder web, at the box girder opening. The upper part of the inner front suspension rod is anchored to the front end of the main suspension frame (i.e., the front suspension beam), and the lower part is anchored to the front end of the bottom formwork (i.e., the front crossbeam of the bottom formwork). In this embodiment, two sets of inner front suspension rods are provided. If it is a double-hole box girder, four sets of inner front suspension rods are provided. The outer front suspension rods are arranged at the flange plates on both sides, i.e., two sets of outer front suspension rods are provided. In this embodiment, the outer front suspension rod includes an upper outer front suspension rod 72 and a lower outer front suspension rod 73. The upper part of the upper outer front suspension rod is anchored to the front end of the main suspension frame, and the lower part is anchored to the wing formwork bracket. The upper part of the lower outer front suspension rod is anchored to the wing formwork bracket, and the lower part is anchored to the front end of the bottom formwork. The front lifting point assembly of the cantilever cast-in-place bridge construction machine provided by this invention is always in the state of casting the largest segment (4m in length), which can cast segment box girders of 2.0m to 4.0m, and has strong practicality.

[0072] The rear end of the bottom formwork of the outer formwork system is suspended from the main body of the hanger and the already poured box girder via the side rear suspension point assembly and the middle rear suspension point assembly, respectively. See Figure 3 The rear side lifting point assemblies are arranged at the flange plates on both sides, so there are two sets of rear side lifting point assemblies. In this embodiment, the rear side lifting point assembly includes a vertically arranged upper rear side lifting rod 74 and a lower rear side lifting rod 75. The upper part of the upper rear side lifting rod is anchored to the rear end of the main body of the hanger (i.e., the rear lifting beam), and the lower part of the upper rear side lifting rod is anchored to the wing formwork bracket. The upper part of the lower rear side lifting rod is anchored to the wing formwork bracket, and the lower part of the lower rear side lifting rod is anchored to the rear end of the bottom formwork (i.e., the rear crossbeam of the bottom formwork). The middle rear lifting point assembly is arranged on one side of the box girder web located at the box girder opening. The middle rear lifting point assembly includes a vertically arranged middle rear lifting rod 76, and there are two sets of middle rear lifting rods. If it is a double-hole box girder, then there are four sets of middle rear lifting point assemblies. The upper part of the middle rear lifting rod is anchored to the bottom plate of the cast box girder, and the lower part of the middle rear lifting rod is anchored to the rear end of the bottom formwork.

[0073] Multiple sets of rear anchor systems are distributed at the rear end of the main truss. The number and location of the rear anchor systems match the number and location of the box girder web. In this embodiment, two sets of rear anchor systems are distributed at the rear end of the main truss, located at the two main longitudinal beams respectively. Figure 14 As shown. Each rear anchor system includes an upper crossbeam 81, a lower suspension beam 82, and an anchor bolt 83, as shown. Figure 15 and Figure 16As shown. The upper crossbeam is fixed to the top of the main truss (i.e., the top of the main longitudinal beam). Two lower suspension beams are provided, both connected to the lower ends of the upper crossbeam by a pin assembly 84, and both lower suspension beams are arranged longitudinally. Specifically, the pin assembly includes ear plates 841, pins 842, and shaft end clamping plates 843. Two ear plates are provided and fixed longitudinally to the bottom of the upper crossbeam. The lower suspension beams are located between the two ear plates, and each ear plate and the lower suspension beam has a corresponding pin hole. The pin passes through the pin hole to connect the two ear plates to the lower suspension beam. The shaft end clamping plate is placed between the pin end and the ear plate and fixed to the ear plate by bolts and washers, thereby limiting and fixing the end of the pin. The shaft end clamping plate is detachable to facilitate the anchoring of the anchor rod. Four sets of anchor bolts are installed, each set consisting of two anchor bolts. The upper ends of the four sets of anchor bolts are anchored to both ends of the two lower suspension beams, and the lower ends of the four sets of anchor bolts are anchored to the top slab of the cast-in-place box girder. Specifically, the anchor bolts are anchored to the lower suspension beams and the top slab of the cast-in-place box girder through anchoring devices and pre-tightened. The anchoring devices include a washer plate, a tapered nut, and a flat nut connected sequentially to the anchor bolt. An inclined washer plate 85 is inserted through the anchor bolt below the top slab of the cast-in-place box girder. The inclination angle of the inclined washer plate matches the angle of the bottom of the top slab of the cast-in-place box girder, and the inclined washer plate is locked against the bottom of the top slab of the cast-in-place box girder by the anchoring devices.

[0074] The auxiliary mechanisms are mainly used for personnel access and equipment maintenance during construction. In this embodiment, auxiliary mechanisms are provided at both the main body of the formwork hanger and the wing formwork bracket, see... Figures 1-3 .

[0075] The construction method of the cantilever cast-in-place bridge construction machine provided by the present invention includes the following steps:

[0076] S1. The concrete pouring of the box girder segment is completed, such as Figure 17 As shown, after the segmental concrete strength reaches the standard, the tie rods of the inner and outer formwork systems are removed, the inner formwork of the inner formwork system is loosened, and permanent prestressing is applied to the segmental concrete.

[0077] S2. The support rods of the formwork hanger are supported on the already poured box girder, such as... Figure 18 As shown, dismantle the connections between the outer formwork system and the inner formwork bracket and the already cast box girder (i.e., the inner formwork lifting point assembly and the middle and rear suspension rods), as follows. Figure 19 As shown; at this time, the entire weight of the inner and outer formwork systems is borne by the formwork hangers, which are supported on the already poured box girder.

[0078] S3. Dismantle the connection between the rear anchor system and the cast-in-place box girder. The supporting trolley retracts, causing the main truss to detach from the cast-in-place box girder. At this point, the main truss is suspended upside down under the formwork hanger. Figure 20 and Figure 21 As shown;

[0079] S4. The longitudinal movement cylinders on the formwork hanger operate, causing the main truss, along with the supporting trolley, to move forward longitudinally into position. Figure 22 and Figure 23 As shown;

[0080] S5. After the main truss is longitudinally moved into position, the support trolley is raised to support the main truss on the cast-in-place box girder. The rear anchoring system is then anchored to the cast-in-place box girder. Finally, the support rods of the formwork hanger are retracted and released from the ground. Figure 24 As shown; at this time, the self-weight of the formwork hanger, outer formwork system and inner formwork system is entirely borne by the main truss and support trolley;

[0081] S6. Lower the support trolley as a whole by 150mm to unload and demold the inner and outer formwork systems. If, after demolding, the outer formwork of the outer formwork system is too tightly fitted to the poured concrete beam, making it difficult to pass through the hole, remove the front outer upper suspension rod anchored between the main body of the hanger and the wing formwork bracket, and then open the outer formwork laterally by 100mm. Figure 25 and Figure 26 As shown;

[0082] S7. When the longitudinal movement cylinder on the formwork hanger operates, the formwork hanger moves forward longitudinally, driving the outer formwork system and the inner formwork system forward longitudinally into place together. Figure 27 As shown;

[0083] S8. Raise the support trolley to adjust the height of the formwork to a suitable elevation, then remove the connecting parts of the bottom formwork and the outer formwork of the outer formwork system, and raise the bottom formwork to the construction height to meet the construction requirements of the next segment; specifically, the two sets of support trolleys are raised alternately.

[0084] If the outer template is opened laterally in step S6, the outer template must be closed laterally before the support trolley is raised.

[0085] S9. Precisely adjust the height and position of the formwork bed, install the connection between the outer formwork system and inner formwork bracket removed in step S2 and the already poured box girder, and prepare for the next segment construction.

Claims

1. A cantilever cast-in-place bridge construction machine, comprising at least a main truss, an outer formwork system, an inner formwork system, a rear anchor system, auxiliary mechanisms, and an electro-hydraulic system, characterized in that: The main truss includes multiple main longitudinal beams and connecting beams between the main longitudinal beams. The number and position of the main longitudinal beams match the number and position of the box girder web. The cantilever cast-in-place bridge construction machine also includes: Support trolleys are installed at the bottom of the main truss in two or more sets. The support trolleys are designed to be liftable, so that the main truss can be supported or detached from the cast box girder. The formwork hanger includes a hanger body and support rods connected to the bottom of the hanger body. The hanger body is slidably installed on the top of the main truss, allowing the hanger body and the main truss to slide relative to each other longitudinally. The support rods are configured as liftable structures, allowing them to support or detach from the cast-in-place box girder. A horizontal inner formwork bracket is suspended from the lower front end of the hanger body via an inner formwork bracket lifting beam. The inner formwork bracket supports the top formwork of the inner formwork system and extends from the rear end of the inner formwork system, being suspended from the cast-in-place box girder via an inner formwork lifting point assembly. Horizontal wing formwork brackets are provided on the lower sides of the hanger body. The two wing formwork brackets are arranged opposite each other and support the bottom of the flange plates of the outer formwork system. The front end of the bottom formwork of the outer formwork system is suspended from the hanger body via a front lifting point assembly. The rear end of the bottom formwork of the outer formwork system is suspended from the hanger body and the cast-in-place box girder via a side rear lifting point assembly and a middle rear lifting point assembly, respectively.

2. The cantilever cast-in-place bridge construction machine according to claim 1, characterized in that: The top of each wing mold bracket is provided with a transverse track, and the bottom of the wing mold template is provided with a transverse wheel set. The transverse wheel set is connected to the transverse track, so that the wing mold template moves laterally along the wing mold bracket.

3. The cantilever cast-in-place bridge construction machine according to claim 1, characterized in that: The number and position of the inner mold brackets match the number and position of the inner mold system.

4. The cantilever cast-in-place bridge construction machine according to claim 1, characterized in that: The bottom of the main body of the hanger is equipped with a reverse hanging device and a sliding pair. The reverse hanging device is reversed and hung on the main truss, and the sliding pair is slidably connected to the guide rail set on the top of the main truss, so that the main body of the hanger is slidably connected to the main truss. A longitudinal movement cylinder is connected between the main body of the hanger and the main truss. The longitudinal movement cylinder extends and retracts, causing the main body of the hanger and the main truss to slide relative to each other in the longitudinal direction.

5. The cantilever cast-in-place bridge construction machine according to claim 1, characterized in that: Each support rod includes an upper rod body and a helical column foot. The bottom of the upper rod body is provided with a threaded hole, and the outer surface of the upper part of the helical column foot is provided with a corresponding thread. By adjusting the connection length of the helical column foot in the threaded hole, the length of the entire support rod can be adjusted, thereby enabling the support rod to support or detach from the cast box girder.

6. The cantilever cast-in-place bridge construction machine according to claim 1, characterized in that: Each set of supporting trolleys includes a trolley crossbeam and a lifting cylinder. The trolley crossbeam is connected to the bottom of the main truss, and the lifting cylinder is connected to the bottom of the trolley crossbeam. The lifting cylinder lifts or retracts, thereby supporting or detaching the main truss from the cast box girder.

7. The cantilever cast-in-place bridge construction machine according to claim 1, characterized in that: The rear anchoring system is provided in multiple sets at the rear end of the main truss. The number and position of the rear anchoring system match the number and position of the box girder web. Each set of rear anchoring system includes an upper crossbeam, a lower suspension beam, and anchor rods. The upper crossbeam is fixed to the top of the main truss. There are two lower suspension beams, which are connected to the lower ends of the upper crossbeam by pin shaft assemblies. Both lower suspension beams are set longitudinally. There are four sets of anchor rods. The upper ends of the four sets of anchor rods are respectively anchored to the two ends of the two lower suspension beams, and the lower ends of the four sets of anchor rods are anchored to the top plate of the cast box girder.

8. A construction method for a cantilever cast-in-place bridge construction machine according to any one of claims 1-7, characterized in that... Includes the following steps: S1. After the concrete pouring of the box girder segment is completed and the concrete strength of the segment reaches the standard, the tie rods of the inner formwork system and the outer formwork system are removed, the inner formwork of the inner formwork system is loosened, and permanent prestressing is applied to the concrete segment. S2. The support rods of the formwork hanger are supported on the already poured box girder, and the connection between the outer formwork system and the inner formwork bracket and the already poured box girder is removed; S3. Remove the connection between the rear anchor system and the cast box girder, and retract the support trolley to detach the main truss from the cast box girder. S4. The longitudinal movement cylinder on the formwork hanger is activated, causing the main truss and the support trolley to move forward longitudinally into place. S5. After the main truss is moved into position, the support trolley is lifted up so that the main truss is supported on the cast box girder. The rear anchor system is then anchored to the cast box girder, and the support rods of the formwork hanger are retracted and released. S6. The support trolley descends as a whole, unloading and demolding the inner and outer mold systems together. S7. The longitudinal movement cylinder on the formwork hanger is activated, and the formwork hanger moves forward longitudinally, driving the outer mold system and the inner mold system to move forward longitudinally into place together; S8. Raise the support trolley to adjust the height of the formwork to a suitable elevation, then remove the connecting parts of the bottom formwork and the outer formwork of the outer formwork system, and raise the bottom formwork to the construction height to meet the construction needs of the next segment. S9. Precisely adjust the height and position of the formwork bed, install the connection between the outer formwork system and inner formwork bracket removed in step S2 and the already poured box girder, and prepare for the next segment construction.

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