Navigation hole support and cast-in-place beam construction method adopting navigation hole support

Abstract

The invention provides a navigation hole support and a cast-in-place beam construction method adopting the navigation hole support. The navigation hole support comprises support stand columns, pile top cross beams and truss beams. The pile top cross beam is fixed to the top of the support stand column, and the pile top cross beam is provided with a shakeout unloading cylinder. The truss girder comprises a plurality of segmental girders, each segmental girder comprises two lower chord members, an upper chord member, a transverse link and two groups of web members, the two lower chord members are arranged on the same horizontal plane in parallel at intervals, the lower chord members are supported on the shakeout unloading cylinder, and the two lower chord members are fixedly connected through the transverse link; the lower chord members of the plurality of segmental beams are connected in sequence; the upper chord members are parallel to the lower chord members, and the upper chord members are arranged above the lower chord members and located between the two lower chord members; the upper chords of the plurality of segmental beams are connected in sequence, and the top surfaces of the upper chords are used for mounting distribution beams; and the two groups of web members are fixedly connected with the two lower chords and the upper chord respectively. The bearing capacity of the support can be improved, the span of the support can be increased, the height of the support can be reduced, and the support is suitable for cast-in-place beam construction of navigation holes with large span clear width and clear height.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a navigation hole bracket and a cast-in-place beam construction method using the bracket. Background Art

[0002] The bridge superstructure adopts the support method to construct the cast-in-place beam. When the bridge crosses the navigable channel, the construction of the cast-in-place beam needs to reserve the navigation width. For this purpose, it is necessary to design the navigation hole support, and the navigation hole support must meet the channel clearance and clear width requirements. When the channel width under the bridge is large, the span of the navigation hole support also increases, and the requirements for the strength, rigidity and stability of the support structure are also increased. In the prior art, the navigation hole support usually includes a support column and a cast-in-place beam support main beam fixed to the top of the support column. The cast-in-place beam support main beam spans the navigable channel, and the formwork for concrete pouring is laid on it. Generally speaking, the main beam of the cast-in-place beam support mostly adopts an I-beam main beam or a Bailey plate main beam, and the maximum spanning capacity is within 12 to 30m. If double-layer Bailey plates are stacked, the spanning capacity can be further improved, but this also leads to a significant increase in the overall height of the support, thereby reducing the clearance under the support, which is not conducive to navigation. Summary of the invention

[0003] In view of the technical problems mentioned in the above background technology, a navigation hole bracket is provided, which can improve the bearing capacity of the bracket, increase the span of the bracket, and reduce the height of the bracket, so as to be suitable for the construction of cast-in-place beams across navigation holes with large net width and net height.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A navigation hole support, used for the construction of cast-in-place beams across navigation holes with large net width and net height, comprises support columns, pile top cross beams and truss beams, wherein the number of the support columns is multiple, and the multiple support columns are respectively arranged on opposite sides of the navigation hole; the pile top cross beam is fixed to the top of the support column, and a sand unloading cylinder is installed on the top surface of the pile top cross beam; the truss beam comprises a plurality of segment beams, each of which comprises two lower chords, an upper chord, a cross link and two sets of web members, and the two lower chords are connected to the cross link. The lower chords are arranged in parallel and at intervals on the same horizontal plane, the lower chord is supported on the top surface of the sand unloading cylinder, and the two lower chords are fixedly connected by the cross-link; the lower chords of several segment beams are connected in sequence; the upper chord is parallel to the lower chord, and the upper chord is arranged above the lower chord and between the two lower chords; the upper chords of several segment beams are connected in sequence, and the top surface of the upper chord is used to install the distribution beam; two groups of web bars are respectively fixedly connected to the two lower chords and the upper chord.

[0006] Furthermore, each group of the web members includes two vertical rods and several pairs of diagonal rods, the two vertical rods are respectively arranged at the opposite ends of the segmental beam, and each of the vertical rods is vertically connected to the upper chord and the corresponding lower chord; several pairs of diagonal rods are arranged between the two vertical rods and are spaced apart along the length direction of the segmental beam, each of the diagonal rods is fixedly connected to the upper chord and the corresponding lower chord, and the distance between a pair of diagonal rods gradually increases in the direction away from the upper chord.

[0007] Furthermore, the navigation hole support also includes an unloading assembly located below the truss beam, the unloading assembly includes a plurality of tracks, a plurality of beam transport vehicles and a plurality of jacks, the plurality of tracks are arranged at intervals along the length direction of the truss beam, each of the tracks is fixed on a support column, the tracks extend along the cross bridge to the outside of the projection of the cast-in-place beam to be constructed, a plurality of the beam transport vehicles are respectively slidably installed on the plurality of tracks, each of the beam transport vehicles is equipped with at least one jack, and the jack is used to lift and unload the truss beam.

[0008] Furthermore, the track is fixed to the top of the peripheral wall of the corresponding support column through a corner brace.

[0009] Furthermore, the beam transport vehicle includes a frame, wheels and a travel drive component, the wheels are rotatably mounted on the frame and mounted on the corresponding track, and the travel drive component is mounted on the frame and connected to the wheels to drive the beam transport vehicle to move along the corresponding track.

[0010] Furthermore, a mounting groove is concavely provided on the top surface of the support column, and the pile top crossbeam is welded and fixed in the corresponding mounting groove.

[0011] Furthermore, the support column includes a plurality of steel pipe piles, and two adjacent steel pipe piles are fixedly connected together by a plurality of horizontal cross braces arranged along the vertical interval, and a scissors brace is arranged between each two adjacent horizontal cross braces, and the scissors brace fixedly connects two adjacent steel pipe piles so that a plurality of the steel pipe piles form a lattice column; the pile top beam is fixed to the top of the steel pipe pile.

[0012] Furthermore, the lower chords of two adjacent segment beams are detachably connected via a first pin; and the upper chords of two adjacent segment beams are detachably connected via a second pin.

[0013] The present invention also provides a cast-in-place beam construction method using the navigation hole bracket, which is used for the construction of a cast-in-place beam spanning a navigation hole with a large clear width and clear height, and comprises the following steps:

[0014] S1, installing the support column;

[0015] S2, fixing the pile top cross beam to the top surface of the support column, the pile top cross beam extends in the transverse direction, and installing a sand removal cylinder on the top surface of the pile top cross beam;

[0016] S3, fixing the track on the top of the support column, the track extending in the transverse direction of the bridge, and installing a beam transport vehicle with a jack on the track;

[0017] S4, supporting the lower chord of the truss beam on the sand unloading cylinder so that the truss beam spans the navigation hole;

[0018] S5, laying a distribution beam on the top surface of the upper chord of the truss beam, and directly arranging formwork and square timber on the top of the distribution beam below the box bottom plate of the cast-in-place beam for pouring concrete; installing a disc-hook bracket on the top of the distribution beam below the wing plate of the cast-in-place beam, and then setting a formwork and square timber on the top of the disc-hook bracket for pouring concrete, thereby completing the construction of the cast-in-place beam.

[0019] Furthermore, after the concrete pouring is completed and the navigation support reaches the removal condition, the truss beam is removed and dismantled by using the removal assembly, including the following steps:

[0020] S61: driving the truss beam to drop by 10-15 cm through the sand unloading tube located on the top of the pile top cross beam, so that the truss beam and the formwork on the truss beam and the distribution beam are separated from the cast-in-place beam;

[0021] S62: Move the beam transport vehicle to the bottom of the truss beam, lift the jack on the beam transport vehicle to support the bottom of the truss beam, and gradually remove the template and distribution beam on the truss beam;

[0022] S63: After all the jacks on the beam transport vehicles below the segmental beam to be removed are lifted to the bottom of the truss beam, all the jacks on the beam transport vehicles are simultaneously lifted by 5 to 10 cm to separate the truss beam from the sand unloading cylinder;

[0023] S64: Make each beam transport vehicle slide synchronously along the track until the truss beam leaves the projection range of the cast-in-place beam, and use a floating crane or a bridge truck crane to lift the truss beam away from the beam transport vehicle; repeat steps S61-S64 to remove the next truss beam.

[0024] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0025] 1. The above-mentioned navigation hole bracket, the truss beam as the main beam is an upper and two lower chords, a web and a cross-connection to form a spatial truss beam structure. The use of a spatial structure truss beam can improve the bearing capacity, increase the bracket span, and reduce the bracket height, thereby enabling the navigation hole bracket to be suitable for the construction of cast-in-place beams across navigation holes with large net width and net height. At the same time, the truss beam includes multiple segmental beams, and the segmental beams can be detachably connected to facilitate span combination.

[0026] 2. The support columns of the above-mentioned navigation hole are in the form of lattice columns, and tracks for unloading truss beams are set on the top sides of the support columns. Since the bridge has a large span and is located in the water, it is difficult to remove the formwork. The unloaded truss beams are transported to the outside of the bridge by the beam transport vehicle on the track, and then removed by a floating crane or a crane, which is more convenient for construction and conducive to improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a navigation hole bracket according to a preferred embodiment of the present invention;

[0028] Figure 2 for Figure 1 A magnified view of the structure at A;

[0029] Figure 3 for Figure 2 A magnified view of the structure in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of a segment beam in a navigation hole bracket according to a preferred embodiment of the present invention;

[0031] Figure 5 This is a schematic structural diagram of a beam transport vehicle in a navigation hole support according to a preferred embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the state of the navigation hole bracket of a preferred embodiment of the present invention when the jack is lifted to contact with the lower chord;

[0033] Figure 7 It is a schematic diagram of a state in which the navigation hole support of a preferred embodiment of the present invention is lifted by a jack so that the segment beam is separated from the sand unloading and shakeout cylinder;

[0034] Figure 8 This is a schematic diagram of a state in which a navigation hole bracket according to a preferred embodiment of the present invention is transported by a beam transport vehicle to a position outside the projection of a cast-in-place beam;

[0035] Main component symbols

[0036] 100. Navigation hole support; 10. Support column; 11. Steel pipe pile; 110. Installation groove; 13. Horizontal cross brace; 15. Scissors brace; 20. Pile top cross beam; 30. Truss beam; 31. Segmental beam; 311. Lower chord; 312. Upper chord; 313. Transverse connection; 314. Cross bar; 315. Diagonal brace; 316. Web bar; 317. Vertical bar; 318. Diagonal bar; 32. Insert block; 34. Slot; 40. Sand unloading barrel; 60. Unloading assembly; 61. Track; 62. Beam transport vehicle; 621. Frame; 622. Wheel; 624. Connecting rod; 63. Jack; 70. Angle brace. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] See also Figure 1 A preferred embodiment of the present invention provides a navigation hole support 100, which is used for the construction of cast-in-place beams across navigation holes with large net width and net height. The navigation hole support 100 includes a support column 10, a pile top cross beam 20 and a truss beam 30. The pile top cross beam 20 is installed on the top of the support column 10, and the truss beam 30 is erected on the pile top cross beam 20 and spans the navigation hole (not shown).

[0041] There are multiple support columns 10, and the multiple support columns 10 are respectively arranged on opposite sides of the navigation hole. Figure 2In this embodiment, the support column 10 includes a plurality of steel pipe piles 11, and two adjacent steel pipe piles 11 are fixedly connected together by a plurality of horizontal cross braces 13 arranged along the vertical interval, and a scissors brace 15 is arranged between each two adjacent horizontal cross braces 13 of the adjacent steel pipe piles 11, and the scissors brace 15 is fixedly connected to the adjacent steel pipe piles 11, and the connection between the scissors brace 15 and the steel pipe pile 11 is located at the intersection of the horizontal cross brace 13 and the steel pipe pile 11, so that the plurality of steel pipe piles 11 form a lattice column.

[0042] The pile top cross beam 20 is fixed to the top of the support column 10. In this embodiment, the pile top cross beam 20 is fixed to the top of the steel pipe pile 11. For details, please refer to Figure 3 , the top surface of the steel pipe pile 11 of the support column 10 is recessed with an installation groove 110, and the pile top crossbeam 20 is welded and fixed in the corresponding installation groove 110. The length direction of the pile top crossbeam 20 is parallel to the transverse bridge direction. In this embodiment, a plurality of pile top crossbeams 20 are arranged at intervals along the longitudinal bridge direction, and the pile top crossbeams 20 are made of I-beams. A sand unloading cylinder 40 is installed on the top surface of the pile top crossbeam 20; in this embodiment, a plurality of sand unloading cylinders 40 are arranged at intervals along the length direction of the pile top crossbeam 20, and the structure and installation method of the sand unloading cylinder 40 belong to the prior art, and will not be repeated here to omit space.

[0043] In this embodiment, the navigation hole support 100 includes a plurality of truss beams 30 arranged along the transverse bridge direction, the length direction of each truss beam 30 is parallel to the longitudinal bridge direction, and each truss beam 30 includes a plurality of segment beams 31, and the plurality of segment beams 31 are sequentially detachably connected. In this embodiment, a segment beam 31 is 6m or 12m long. Please refer to Figure 4 Each segment beam 31 includes two lower chords 311, an upper chord 312, a cross link 313 and two sets of web members 316. The two lower chords 311 are arranged in parallel and spaced apart on the same horizontal plane. The lower chord 311 is supported on the top surface of the sand unloading cylinder 40. In this embodiment, the lower chord 311 is made of two double-jointed I-beams welded together, and the length direction of the lower chord 311 is parallel to the longitudinal bridge direction. The two lower chords 311 are fixedly connected by a cross link 313. Specifically, the cross link 313 includes a plurality of cross bars 314 and a plurality of diagonal braces 315. The cross bars 314 and the diagonal braces 315 are both made of channel steel. The plurality of cross bars 314 are arranged at intervals along the length direction of the lower chord 311. Each cross bar 314 vertically connects the two lower chords 311 by welding. A diagonal brace 315 is arranged between two adjacent cross bars 314. The diagonal brace 315 is inclined relative to the lower chord 311. Each diagonal brace 315 connects the two lower chords 311 by welding, and the connection between the diagonal brace 315 and the lower chord 311 is located at the intersection of the cross bar 314 and the lower chord 311.

[0044] The upper chord 312 is parallel to the lower chord 311, and the upper chord 312 is arranged above the lower chord 311 and between the two lower chords 311, so that the cross section of the truss beam 30 is roughly an isosceles triangle. In this embodiment, the lower chord 311 is made by welding two double-jointed I-beams, and the top surface of the upper chord 312 is used to install the distribution beam. Two groups of web members 316 are respectively fixedly connected to the two lower chords 311 and the upper chord 312, that is, one group of web members 316 is fixedly connected to a lower chord 311 and the upper chord 312, and the other group of web members 316 is fixedly connected to the other lower chord 311 and the upper chord 312. In this embodiment, each set of web members 316 includes two vertical rods 317 and a plurality of pairs of diagonal rods 318, both of which are made of channel steel, and the two vertical rods 317 are respectively arranged at opposite ends of the segment beam 31, and each vertical rod 317 is vertically connected to the upper chord rod 312 and the corresponding lower chord rod 311; a plurality of pairs of diagonal rods 318 are arranged between the two vertical rods 317 and are spaced along the length direction of the segment beam 31, and each diagonal rod 318 is fixedly connected to the upper chord rod 312 and the corresponding lower chord rod 311, and the distance between a pair of diagonal rods 318 gradually increases in the direction away from the upper chord rod 312. In this embodiment, the vertical rods 317, the upper chord rod 312 and the lower chord rod 311 are fixed by welding, and the diagonal rods 318, the upper chord rod 312 and the lower chord rod 311 are fixed by welding.

[0045] The lower chords 311 of several segment beams 31 are connected in sequence. In the present embodiment, the lower chords 311 of two adjacent segment beams 31 are detachably connected via a first pin shaft (not shown). Specifically, an insert block 32 is protruding from one end of the lower chord 311, and a first insert hole (not marked) is provided on the insert block 32. A slot 34 and a second insert hole (not marked) connected to the slot 34 are provided at the other end of the lower chord 311. In the present embodiment, the slot 34 is formed between two I-beams constituting the lower chord 311, wherein the insert block 32 of a lower chord 311 is inserted into the slot 34 of an adjacent lower chord 311, and the first pin shaft passes through the second insert hole and the first insert hole, thereby connecting the lower chords 311 of two adjacent segment beams 31 together. The upper chords 312 of several segment beams 31 are connected in sequence. In the present embodiment, the upper chords 312 of two adjacent segment beams 31 are detachably connected via a second pin shaft (not shown). Specifically, an insert block 32 is protruding from one end of the upper chord 312. The insert block 32 of the upper chord 312 and the insert block 32 on the lower chord 311 are arranged at the same end of the segment beam 31. A first plug hole (not marked) is arranged on the insert block 32 of the upper chord 312. A slot 34 and a second plug hole (not marked) connected to the slot 34 are arranged at the other end of the upper chord 312. In the present embodiment, the slot 34 is formed between two I-beams constituting the upper chord 312, wherein the insert block 32 of one upper chord 312 is inserted into the slot 34 of an adjacent upper chord 312, and the second pin shaft passes through the second plug hole and the first plug hole, thereby detachably connecting the upper chords 312 of two adjacent segment beams 31 together.

[0046] The navigation hole support 100 also includes a discharging assembly 60 located below the truss beam 30. The discharging assembly 60 is used to discharging the truss beam 30 after the cast-in-place beam is cast. The discharging assembly 60 includes a plurality of rails 61, a plurality of beam transport vehicles 62, and a plurality of jacks 63. The plurality of rails 61 are arranged at intervals along the length direction of the truss beam 30. In this embodiment, two rails 61 are correspondingly arranged below each segment beam 31, and the two rails 61 are respectively arranged at opposite ends of the corresponding segment beam 31. Each rail 61 is fixed to the steel pipe pile 11 of the support column 10. Specifically, the rail 61 is fixed to the top of the peripheral wall of the corresponding steel pipe pile 11 through an angle brace 70. The angle brace 70 is made of angle steel, and the angle brace 70 is fixed to the top of the peripheral wall of the corresponding steel pipe pile 11 by welding. The rail 61 is made of I-beam, and the rail 61 is fixed to the top surface of the angle brace 70 by welding. The rail 61 extends to both sides along the cross bridge to the outside of the projection of the cast-in-place beam to be constructed, so as to facilitate the removal of the support.

[0047] A plurality of beam transport vehicles 62 are slidably mounted on a plurality of tracks 61. In this embodiment, a pair of beam transport vehicles 62 is correspondingly provided below each segment beam 31. The pair of beam transport vehicles 62 are respectively mounted on two tracks 61 below the two ends of the segment beam 31 and can move along the corresponding tracks 61 to transport the corresponding segment beam 31. Figure 5 The beam transport vehicle 62 includes a frame 621, a wheel 622 and a travel drive member (not shown), the wheel 622 is rotatably mounted on the frame 621, and the travel drive member is mounted on the frame 621 and connected to the wheel 622, so as to drive the wheel 622 to rotate and drive the beam transport vehicle 62 to move along the corresponding track 61. The travel drive member can adopt a motor of the prior art, etc., and its structure belongs to the prior art. For the sake of omitting the space, it will not be repeated here. In addition, the frame 621 of a pair of beam transport vehicles 62 below the two ends of each segment beam 31 can also be fixedly connected together by a connecting rod 624 to ensure that a pair of beam transport vehicles 62 below the two ends of each segment beam 31 move synchronously, thereby improving the stability of the transportation of the segment beam 31. In this embodiment, the movement of the beam transport vehicle 62 is synchronously controlled by a remote controller (not shown), and the remote controller can be connected to the travel drive member signal through the radio signal of the prior art. The means for realizing the synchronous control of the movement of the beam transport vehicle 62 by the remote controller belongs to the prior art, and for the sake of omitting the space, it will not be repeated here.

[0048] At least one jack 63 is installed on each beam transport vehicle 62, and the jack 63 is used for lifting and unloading the truss beam 30. In this embodiment, two jacks 63 are fixed on the frame 621 of each beam transport vehicle 62.

[0049] The embodiment of the present invention further provides a cast-in-place beam construction method using the navigation hole bracket 100, which is used for the construction of a cast-in-place beam spanning a navigation hole with a large clear width and clear height, and comprises the following steps:

[0050] S1, drive the support column 10. In this embodiment, Φ820*10 steel pipes are used as steel pipe piles 11, and the steel pipe piles 11 are driven by a pile driving ship at a longitudinal and transverse spacing of 6m. After driving, Φ315*10 steel pipes are welded between the steel pipe piles 11 as horizontal cross braces 13 and scissor braces 15, so that the steel pipe piles 11 become lattice columns to enhance the stability of the support column 10. The arrangement range of the support column 10 should be 4 to 6m wide on both sides of the pouring beam to facilitate demoulding.

[0051] S2, fix the pile top cross beam 20 to the top surface of the steel pipe pile 11, the pile top cross beam 20 extends in the transverse direction, and installs the sand removal tube 40 on the top surface of the pile top cross beam 20. In this embodiment, the top of the steel pipe pile 11 is provided with an I-beam along the transverse direction as the pile top cross beam 20, and the pile top cross beam 20 is welded and fixed to the steel pipe pile 11.

[0052] S3, a track 61 is fixed on the top of the support column 10, the track 61 extends along the transverse direction, and a beam transport vehicle 62 with a jack 63 is installed on the track 61. In this embodiment, a 10# angle steel angle brace 70 is set on the pile top side of the steel pipe pile 11 of the support column 10, for installing an I25a I-beam track 61 for the beam transport vehicle 62 to travel on, and the track 61 is welded to the angle brace 70. The track 61 extends to both sides along the transverse direction to the outside of the cast-in-place beam projection, which is convenient for the removal of the support.

[0053] S4, supporting the lower chord 311 of the truss beam 30 on the sand unloading cylinder 40, so that the truss beam 30 spans the navigation hole.

[0054] In this embodiment, the segment beam 31 is processed and manufactured off-site and is a triangular truss structure. The length of a single segment beam 31 is 6m or 12m. The upper chord 312 and the lower chord 311 are both welded by two 2I36a I-beams. The center distance between the two lower chords 311 is 1200mm, and the center distance between the upper and lower chords 311 is 2500mm. 20a channel steel is set between the chords as a cross link 313 and a web member 316, which are evenly arranged according to the length of the segment beam 31. After the segment beam 31 is assembled into a truss beam 30 with a length of 60m in the processing site, it is hoisted and launched as a whole, transported to the installation site by a transport ship, and installed on the pile top cross beam 20 at the top of the steel pipe pile 11 by floating crane.

[0055] S5, lay the distribution beam on the top surface of the upper chord 312 of the truss beam 30, determine the longitudinal spacing of the distribution beam according to the weight of the cast-in-place beam, directly arrange the formwork and square timber on the top of the distribution beam below the box bottom plate of the cast-in-place beam to pour concrete; install the disc bracket on the top of the distribution beam below the wing plate of the cast-in-place beam, and then set the formwork and square timber on the top of the disc bracket to pour concrete, thereby completing the construction of the cast-in-place beam.

[0056] S6, after the concrete pouring is completed and the navigation hole bracket 100 reaches the removal condition, the truss beam 30 is removed and removed by using the removal assembly 60, including the following steps:

[0057] S61: The truss beam 30 is driven to drop by 10-15 cm by the sand unloading tube 40 located on the top of the pile top cross beam 20, so that the truss beam 30 and the formwork on the truss beam 30 are separated from the cast-in-place beam;

[0058] S62: Move the beam transport vehicle 62 to the bottom of the truss beam 30, lift the jack 63 of the beam transport vehicle 62 to contact the bottom of the truss beam 30, and gradually remove the template and distribution beam on the upper part of the truss beam 30;

[0059] S63: After all the jacks 63 on the beam transport vehicles 62 below the truss beam 30 are lifted to the bottom of the truss beam 30, all the jacks 63 on the beam transport vehicles 62 are simultaneously lifted by 5 to 10 cm to separate the truss beam 30 from the sand unloading cylinder 40;

[0060] S64: Make each beam transport vehicle 62 slide synchronously along the track 61 until the truss beam 30 leaves the projection range of the cast-in-place beam, and use a floating crane or a bridge truck crane to lift the truss beam 30 away from the beam transport vehicle 62; repeat steps S61-S64 to remove the next truss beam 30.

[0061] The effect of the navigation hole bracket 100 of this embodiment is briefly described below with reference to a specific embodiment.

[0062] A certain bridge is a beam-arch composite arch bridge with a main span of 180m. The main beam is a cast-in-place prestressed reinforced concrete box beam, and the arch rib is a steel box arch. The bridge crosses a river below, and the net width and net height of the navigation hole are maintained at 48m and 18m during construction. The cast-in-place box beam is planned to be constructed with steel pipe supports, and 1.5m high Bailey beam supports are used at non-navigation holes. Due to the large span at the navigation hole, if Bailey beam supports are used, 2m high Bailey beam supports need to be stacked on both sides, which results in the navigation net height not meeting the requirements. For this reason, the truss beam 30 of this embodiment is used as the main beam at the navigation hole, and the net height of the main beam is 2.86m, which meets the requirements of the navigation hole.

[0063] The above-mentioned navigation hole bracket 100, the truss beam 30 as the main beam is an upper chord 312, two lower chords 311, a web 316 and a cross-link 313 to form a spatial truss beam structure. The use of the spatial structure truss beam 30 can improve the bearing capacity, increase the bracket span, and reduce the bracket height, thereby enabling the navigation hole bracket 100 to be suitable for the construction of cast-in-place beams across navigation holes with large net width and net height. At the same time, the truss beam 30 includes a plurality of segment beams 31, and the segment beams 31 can be detachably connected to facilitate span combination.

[0064] Since the span of the bridge is large and it is located in the water, it is difficult to remove the formwork. The above-mentioned navigation hole support 100 and the support column 10 are in the form of lattice columns. The top side of the support column 10 is provided with a track 61 for unloading the truss beam 30. After the truss beam 30 is unloaded by the sand unloading cylinder 40 on the pile top beam 20, the jack 63 on the beam transport vehicle 62 lifts the truss beam 30 to separate it from the sand unloading cylinder 40. Then the beam transport vehicle 62 is moved along the track 61 to drive the truss beam 30 away from the range of the cast-in-place beam. Finally, the truss beam 30 can be lifted off the support by a floating crane and transported away by a transport ship. The main beam can also be lifted to the bridge deck by a crane on the bridge, disassembled into a single segment beam 31 and then transported away, thereby simplifying the operation of removing the formwork on the water and helping to improve construction efficiency.

[0065] In order to ensure the navigation clearance requirements, the above-mentioned cast-in-place beam construction method further reduces the support height. The disc bracket is no longer set on the distribution beam below the box bottom plate of the cast-in-place beam, but square timber and bottom formwork are directly laid, and cast-in-place beam supports are only set at the position of the cast-in-place beam wing plate.

[0066] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A navigation hole bracket, used for the construction of cast-in-place beams across navigation holes with large net width and net height, characterized in that: The sprocket wheel is annularly fixed to the top of the support column, and the sprocket wheel is vertically connected to the bottom of the support column and the vertically connected rod is vertically connected to the bottom of the support column. The sprocket wheel is vertically connected to the bottom of the support column and the vertically connected rod is vertically connected to the bottom of the support column. The sprocket wheel is vertically connected to the bottom of the support column and the vertically connected rod is vertically connected to the bottom of the support column.

2. The navigation hole bracket according to claim 1, characterized in that: Each group of the web members includes two vertical rods and a plurality of pairs of diagonal rods, the two vertical rods are respectively arranged at the opposite ends of the segmental beam, and each of the vertical rods is vertically connected to the upper chord and the corresponding lower chord; a plurality of pairs of diagonal rods are arranged between the two vertical rods and are spaced apart along the length direction of the segmental beam, each of the diagonal rods is fixedly connected to the upper chord and the corresponding lower chord, and the distance between a pair of the diagonal rods gradually increases in the direction away from the upper chord.

3. The navigation hole bracket according to claim 1, characterized in that: The navigation hole support also includes an unloading assembly located below the truss beam, the unloading assembly includes a plurality of tracks, a plurality of beam transport vehicles and a plurality of jacks, the plurality of tracks are arranged at intervals along the length direction of the truss beam, each of the tracks is fixedly connected to the support column, the tracks extend along the cross bridge to the outside of the projection of the cast-in-place beam to be constructed, a plurality of the beam transport vehicles are respectively slidably installed on the plurality of tracks, each of the beam transport vehicles is equipped with at least one jack, and the jack is used to lift and unload the truss beam.

4. The navigation hole bracket according to claim 3, characterized in that: The track is fixed to the top of the peripheral wall of the corresponding support column through a corner brace.

5. The navigation hole bracket according to claim 3, characterized in that: The beam transport vehicle includes a frame, wheels and a travel drive component. The wheels are rotatably mounted on the frame and mounted on the corresponding tracks. The travel drive component is mounted on the frame and connected to the wheels to drive the beam transport vehicle to move along the corresponding tracks.

6. The navigation hole bracket according to claim 1, characterized in that: The top surface of the support column is concavely provided with an installation groove, and the pile top crossbeam is welded and fixed in the corresponding installation groove.

7. The navigation hole bracket according to claim 1, characterized in that: The support column includes a plurality of steel pipe piles, and two adjacent steel pipe piles are fixedly connected together by a plurality of horizontal cross braces arranged along the vertical interval, and a scissors brace is arranged between each two adjacent horizontal cross braces, and the scissors brace is fixedly connected to the adjacent steel pipe piles so that a plurality of the steel pipe piles form a lattice column; the pile top beam is fixed to the top of the steel pipe pile.

8. The navigation hole bracket according to claim 1, characterized in that: The lower chords of two adjacent segment beams are detachably connected via a first pin shaft; and the upper chords of two adjacent segment beams are detachably connected via a second pin shaft.

9. A method for constructing a cast-in-place beam using the navigation hole support as claimed in claim 3, which is used for constructing a cast-in-place beam across a navigation hole with a large clear width and clear height, characterized in that: The following steps are involved: S1, installing the support column; S2, fixing the pile top cross beam to the top surface of the support column, the pile top cross beam extends in the transverse direction, and installing a sand removal cylinder on the top surface of the pile top cross beam; S3, fixing the track on the top of the support column, the track extending in the transverse direction of the bridge, and installing a beam transport vehicle with a jack on the track; S4, supporting the lower chord of the truss beam on the sand unloading cylinder so that the truss beam spans the navigation hole; S5, laying a distribution beam on the top surface of the upper chord of the truss beam, and directly arranging formwork and square timber on the top of the distribution beam below the box bottom plate of the cast-in-place beam for pouring concrete; installing a disc-hook bracket on the top of the distribution beam below the wing plate of the cast-in-place beam, and then setting a formwork and square timber on the top of the disc-hook bracket for pouring concrete, thereby completing the construction of the cast-in-place beam.

10. The method for constructing a cast-in-place beam of a navigation hole support according to claim 9, characterized in that: After the concrete pouring is completed and the navigation support reaches the removal condition, the truss beam is removed and dismantled by using the removal assembly, including the following steps: S61: driving the truss beam to drop by 10-15 cm through the sand unloading tube located on the top of the pile top cross beam, so that the truss beam and the formwork on the truss beam and the distribution beam are separated from the cast-in-place beam; S62: Move the beam transport vehicle to the bottom of the truss beam, lift the jack on the beam transport vehicle to support the bottom of the truss beam, and gradually remove the template and distribution beam on the truss beam; S63: After all the jacks on the beam transport vehicles below the truss beam are lifted to the bottom of the truss beam, all the jacks on the beam transport vehicles are simultaneously lifted by 5 to 10 cm to separate the truss beam from the sand unloading cylinder; S64: Make each beam transport vehicle slide synchronously along the track until the truss beam leaves the projection range of the cast-in-place beam, and use a floating crane or a bridge truck crane to lift the truss beam away from the beam transport vehicle; repeat steps S61-S64 to remove the next truss beam.

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