Solid concrete main tower inhaul cable system of extradosed cable-stayed extra-large bridge

Abstract

The utility model relates to a solid concrete main tower inhaul cable system of an extradosed cable-stayed extra-large bridge. According to the system, piers are constructed on a bearing platform, 0 # box girders are poured on the piers, a main tower is constructed on the 0 # box girders, beam end anchorage devices and embedded pipes are embedded in the surfaces of the 0 # box girders, and tower end anchorage devices and embedded pipes are embedded in the two sides of the main tower; a bearing platform is arranged on the top of the main tower, cable hanging construction platforms are hung on the bearing platform on the two sides of the main tower, and an operation platform is arranged on the cable hanging construction platforms through jacks. The main bridge temporary consolidation system has the advantages that the hanging basket synchronous cable hanging construction technology is adopted, and the main bridge temporary consolidation system is formed through the concrete temporary supporting columns and used for 0 # box girder concrete pouring construction; and then hanging basket construction, main tower construction and cable hanging construction are synchronously carried out, and the construction efficiency of the extradosed cable-stayed bridge is improved.

Description

Technical Field

[0001] The utility model relates to the field of main tower cable construction, in particular to a solid concrete main tower cable system of a short-tower cable-stayed bridge. Background Art

[0002] The low-tower cable-stayed bridge is a new type of bridge that has appeared in the past 20 years. The low-tower cable-stayed bridge is also called a partial cable-stayed bridge. It has the structural advantages of both cable-stayed bridges and continuous beam bridges. It has greater rigidity and lower bridge tower height. The bridge is beautiful and has a large span capacity, showing great development potential. Cable-stayed construction is one of the most critical links in the construction of low-tower cable-stayed bridges. At present, the cable-stayed cable installation and construction method requires the installation of many embedded parts on the bridge deck in advance as reaction points for the traction rope guide pulley, which increases the cost of construction auxiliary materials and the risks during the construction process. At the same time, during the tensioning process of each steel strand, an external tower bracket needs to be set up to assist the construction. The bracket is high and time-consuming and labor-intensive. In addition, for the traction installation of the ultra-long cable of the large-span cable-stayed bridge, the conventional cable-stayed cable soft-hard combination traction device is not integrated. During the operation, the hard traction jack and the soft traction jack need to be replaced alternately, which is complicated and difficult to operate.

[0003] Therefore, in response to the above-mentioned problems found in the process, it is necessary to integrate and form a solid concrete main tower cable system for the low-tower cable-stayed bridge with high construction quality, fast construction speed and low construction cost, while ensuring the construction quality of the main tower cable of the low-tower cable-stayed bridge. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a solid concrete main tower cable system for a low-tower cable-stayed bridge.

[0005] The solid concrete main tower cable system of this low-tower cable-stayed bridge includes a cap, HDPE pipe and hoisting device;

[0006] There are bridge piers on the cap, 0# box beams are cast on the piers, main towers are constructed on the 0# box beams, beam end anchors and embedded pipes are pre-buried on the surface of the 0# box beams, tower end anchors and embedded pipes are pre-buried on both sides of the main towers; a load-bearing platform is set on the top of the main tower, and cable construction platforms are hung on both sides of the main tower. An operating platform is arranged on the cable construction platform through a jack;

[0007] One end of the HDPE pipe is covered with a clamp lifting device, and the load-bearing platform lifts the clamp lifting device through a steel wire rope. The two ends of the steel strands passed through the HDPE pipe are respectively connected to the tower end anchor and embedded pipe and the beam end anchor and embedded pipe; the beam end where the steel strands have been passed through is connected to the beam end soft and hard traction integrated combination device; the tower end where the steel strands have been passed through is connected to the tower end hard traction device.

[0008] Preferably, temporary concrete support columns and channel steel supports are cast around the piers on the cap to form a temporary consolidation system for the main bridge. Temporary supports are provided on the piers, and 0# box girder concrete is cast on the temporary consolidation system and temporary supports of the main bridge; beam end anchors and embedded pipes are pre-embedded on the surface of the 0# box girder, and tower end anchors and embedded pipes are pre-embedded on both sides of the main tower.

[0009] Preferably, a bracket is provided at the top of the main tower, a load-bearing platform is installed above the bracket, and a winch and a fixed pulley group are provided on the load-bearing platform; a cable-hanging construction platform is arranged on both sides of the main tower, and the cable-hanging construction platform is connected to a movable pulley group through a lifting ring, and the movable pulley group is connected to the winch and the fixed pulley group on the load-bearing platform to form a cyclic lifting system for coarse adjustment of the height of the cable-hanging construction platform; a frame structure is provided at each end of the load-bearing platform, and an operating platform is provided between the frame structures, and the frame structure includes an upper bottom plate, a telescopic plate and a lower bottom plate, and the telescopic plate is arranged between the upper bottom plate and the lower bottom plate, and the lower bottom plate is connected to the operating platform A jack is installed between the working platforms for fine-tuning the height of the cable-hanging construction platform; a traction piece and an inclined rod are installed on the upper bottom plate, and a number of supporting steel pipes are arranged between the traction piece and the inclined rod; the bottom of the traction piece passes through to the bottom of the operating platform and is installed with a bearing, and a chain is arranged between the two bearings; adjustment rails are slotted on both sides of the operating platform, and protective vertical rods are slidably connected to the adjustment rails, and the bottom of the protective vertical rod is placed on the adjustment rail through an adjustment block and an anti-sliding block, the anti-sliding block extends to the bottom of the operating platform, and the width of the anti-sliding block is greater than the width of the adjustment rail; a number of retractable protective cross bars and connecting rods are evenly arranged between the protective vertical rods.

[0010] Preferably, guide wheels are provided on both sides of the load-bearing platform, and the hoisting device comprises an arc plate and a connecting plate, and the arc plate is annular to form a limiting groove; three lifting rings are installed on the connecting plate by bolts, wherein the first two lifting rings are connected to the guide wheels of the load-bearing platform by steel wire ropes, and the last lifting ring is connected to a sleeve by steel wire ropes, and the sleeve is also sleeved on the HDPE pipe; the HDPE pipe is placed in the limiting groove provided on the arc plate, and fastening plates are provided between adjacent arc plates; the steel strand to be threaded is wound in the pay-off drum, and one end enters the HDPE pipe by a wire threading machine, and the steel strands at both ends of the HDPE pipe are respectively connected to the tower end anchor and embedded pipe and the beam end anchor and embedded pipe to form threaded steel strands.

[0011] Preferably, the integrated soft and hard traction combination device at the beam end includes a tensioning rod and a second support leg, wherein the beam end anchor and the embedded pipe are connected to the tensioning rod, the tensioning rod is placed in the second support leg and fixed by a tensioning end nut, a hard traction jack is installed on the second support leg, the hard traction jack is installed on the first support leg, a soft traction connector is installed in the first support leg using a soft traction nut, and a soft traction jack is also installed on the first support leg; wherein the soft traction connector includes an upper disc, an elastic support rod and a lower threaded disc, the elastic support rod is arranged between the upper disc and the lower threaded disc, through holes are opened on the upper disc and the lower threaded disc, and the steel strands are passed through the through holes through the soft traction connector, a spring and a connecting rod are arranged inside the elastic support rod, and the spring is sleeved on the connecting rod.

[0012] Preferably, the hard traction device at the tower end includes a tensioning rod and a second support leg. The tower end anchor and the embedded pipe are connected to the tensioning rod. The tensioning rod is connected to the second support leg through a tensioning end nut. A hard traction jack is provided on the second support leg for tensioning the tower end through which the steel strand has been passed. An anti-rotation device is provided between the tower end anchor and the embedded pipe and the second support leg. The anti-rotation device includes a pressure plate and a positioning vertical rod. A hole is opened in the middle of the pressure plate to form a limiting groove. The limiting groove is sleeved on the tower end anchor and the embedded pipe, and a serrated pattern is provided on the inner wall of the limiting groove. A rib plate is welded between the bottom of the positioning vertical rod and the pressure plate, a positioning rail is welded on the top of the positioning vertical rod, a positioning block is provided on the second support leg, and the positioning rail and the positioning block are connected and fixed.

[0013] The beneficial effects of the utility model are:

[0014] 1) The utility model adopts the hanging basket synchronous cable hanging construction technology, and uses the temporary concrete support column to form a temporary consolidation system of the main bridge, which is used for the 0# box girder concrete pouring construction; then supports the hanging basket construction, main tower construction and cable hanging construction to be carried out synchronously, thereby improving the construction efficiency of the low-tower cable-stayed bridge.

[0015] 2) The utility model uses a tower top bracket arranged on the top of the main tower, which is respectively connected with the movable pulley group, the winch and the fixed pulley group to form a cyclic lifting system, and roughly adjusts the height of the cable construction platform. At the same time, the height of the cable construction platform is accurately adjusted by the jack arranged on the cable construction platform. During the construction process, there is no need to specially install a tower bracket to assist the installation of the inclined cable, which improves the installation speed of the cable.

[0016] 3) The utility model places the HDPE pipe in the limiting groove of the clamp lifting device, utilizes the clamp lifting device, the guide wheel and the winch to form a lifting circulation system, and quickly positions and installs the HDPE pipe.

[0017] 4) The utility model aims at the large traction force of the super-long inclined cable, and utilizes the integrated soft and hard traction combination device at the beam end to carry out traction and tensioning. An elastic support rod containing a spring and a connecting rod is arranged to play the role of shock absorption and stability maintenance, and a hard traction jack and a soft traction jack are integrated. During the tensioning process, there is no need to alternately replace and install the hard traction jack and the soft traction jack, which is simple to operate and has high construction efficiency.

[0018] 5) The utility model has developed a hard traction device for preventing the tower end from rotating. The anti-rotation device consists of a pressure plate and a positioning vertical rod. A hole is opened in the middle of the pressure plate to form a limit groove, which is placed on the tower end anchor and the embedded pipe. The inner wall of the limit groove is provided with a serrated pattern to increase friction. The positioning vertical rod is quickly connected and fixed with the positioning block on the support foot by using the positioning track to prevent the torsional force released when the inclined cable is tensioned from driving the jack and the tensioning tooling to rotate together, thereby damaging the jack and causing a safety accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic elevation diagram of the construction technology of hanging basket and synchronous hanging cable;

[0020] Figure 2 It is the elevation layout of the lifting and hanging cable construction platform under the main tower;

[0021] Figure 3 It is a schematic diagram of the front structure of the cable hanging construction platform;

[0022] Figure 4 It is a schematic diagram of the bottom structure of the cable hanging construction platform;

[0023] Figure 5 This is a construction diagram of HDPE pipe lifting and installation;

[0024] Figure 6 It is a structural schematic diagram of the hoisting device;

[0025] Figure 7 This is a construction diagram of the cable-stayed cable strand threading;

[0026] Figure 8 This is a schematic diagram of the tensioning of the ends and towers of a low-tower cable-stayed super-large bridge;

[0027] Fig. 9 It is a cross-sectional view of the integrated soft and hard traction assembly at the beam end;

[0028] Fig.10 It is a structural schematic diagram of a soft traction connector;

[0029] Fig.11 is a schematic diagram of the structure of the elastic support rod;

[0030] Fig.12 It is a cross-sectional view of the integrated soft and hard traction assembly at the beam end;

[0031] Fig.13 It is a structural schematic diagram of the anti-rotation device.

[0032] In the figure: 1-cap, 2-temporary concrete support column, 3-channel steel support, 4-hanging basket, 5-0# box beam, 6-main tower, 7-bracket, 8-load-bearing platform, 9-winch, 10-hanging cable construction platform, 11-temporary support, 12-bridge pier, 13-lower bottom plate, 14-jack, 15-diagonal rod, 16-support steel pipe, 17-protective vertical rod, 18-protective horizontal rod, 19-adjustable track, 20-adjustment block, 21-connecting rod, 22-operating platform, 23-lifting ring, 24-traction piece, 25-upper bottom plate, 26-telescopic plate, 27-bearing, 28-anti-sliding block, 29-chain, 30-beam end anchor and embedded pipe, 31-HDPE pipe, 32-casing, 33-hoop lifting device, 34-guide wheel, 35-tower end anchor and embedded pipe, 36-wire rope, 37-limiting groove , 38-connecting plate, 39-arc plate, 40-bolt, 41-fastening plate, 42-threaded steel strand, 43-threading machine, 44-to-be-threaded steel strand, 45-pay-off drum, 46-moving pulley group, 47-fixed pulley group, 48-tower end hard traction device, 49-beam end soft and hard traction integrated combination device, 50-tensioning rod, 51-tensioning end nut, 52-hard traction jack, 53-soft traction nut , 54-soft traction jack, 55-first support foot, 56-soft traction connector, 57-second support foot, 58-threaded disc, 59-elastic support rod, 60-disc, 61-through hole, 62-spring, 63-connecting rod, 64-anti-rotation device, 65-positioning block, 66-limiting groove, 67-pressure plate, 68-toothed pattern, 69-rib plate, 70-positioning vertical rod, 71-positioning track. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0034] Embodiment 1

[0035] As an embodiment, the solid concrete main tower cable system of this short tower cable-stayed bridge is as follows: Figures 1 to 13 As shown, it includes a cap 1, a HDPE pipe 31 and a hoisting device 33;

[0036] A bridge pier 12 is constructed on the cap 1, a 0# box beam 5 is cast on the bridge pier 12, a main tower 6 is constructed on the 0# box beam 5, a beam end anchor and a pre-buried pipe 30 are pre-buried on the surface of the 0# box beam 5, and tower end anchors and pre-buried pipes 35 are pre-buried on both sides of the main tower 6; a load-bearing platform 8 is provided on the top of the main tower 6, and a hanging cable construction platform 10 is hung on both sides of the main tower 6 on the load-bearing platform 8, and an operating platform 22 is arranged on the hanging cable construction platform 10 through a jack 14;

[0037] A bracket 7 is provided at the top of the main tower 6, and a load-bearing platform 8 is installed above the bracket 7. A winch 9 and a fixed pulley group 47 are provided on the load-bearing platform 8; a cable-hanging construction platform 10 is arranged on both sides of the main tower 6, and the cable-hanging construction platform 10 is connected to a movable pulley group 46 through a lifting ring 23, and the movable pulley group 46 is connected to the winch 9 and the fixed pulley group 47 on the load-bearing platform 8 to form a cyclic lifting system for coarse adjustment of the height of the cable-hanging construction platform 10; a frame structure is provided at each end of the load-bearing platform 8, and an operating platform 22 is provided between the frame structures, and the frame structure includes an upper bottom plate 25, a telescopic plate 26 and a lower bottom plate 13, and the telescopic plate 26 is provided between the upper bottom plate 25 and the lower bottom plate 13, and a thousand-meter space is provided between the lower bottom plate 13 and the operating platform 22. The jack 14 is used for fine-tuning the height of the cable-hanging construction platform 10; a traction member 24 and an inclined rod 15 are installed on the upper base plate 25, and a plurality of supporting steel pipes 16 are arranged between the traction member 24 and the inclined rod 15; the bottom of the traction member 24 passes through the bottom of the operating platform 22 and is installed with a bearing 27, and a chain 29 is arranged between the two bearings 27; an adjustment track 19 is slotted on both sides of the operating platform 22, and a protective vertical rod 17 is slidably connected to the adjustment track 19, and the bottom of the protective vertical rod 17 is placed on the adjustment track 19 through an adjustment block 20 and an anti-sliding block 28, and the anti-sliding block 28 extends to the bottom of the operating platform 22, and the width of the anti-sliding block 28 is greater than the width of the adjustment track 19; a plurality of retractable protective cross bars 18 and connecting rods 21 are evenly arranged between the protective vertical bars 17.

[0038] One end of the HDPE pipe 31 is covered with a clamp lifting device 33, and the load-bearing platform 8 lifts the clamp lifting device 33 through a steel wire rope 36. The two ends of the steel strand 42 passed through the HDPE pipe 31 are respectively connected to the tower end anchor and embedded pipe 35 and the beam end anchor and embedded pipe 30; the beam end through which the steel strand 42 has been passed is connected to a beam end soft and hard traction integrated combination device 49; the tower end through which the steel strand 42 has been passed is connected to a tower end hard traction device 48.

[0039] Guide wheels 34 are provided on both sides of the load-bearing platform 8. The hoop lifting device 33 includes an arc plate 39 and a connecting plate 38. The arc plate 39 is annular to form a limiting groove 37; three lifting rings 23 are installed on the connecting plate 38 through bolts 40, wherein the first two lifting rings 23 are connected to the guide wheels 34 of the load-bearing platform 8 by means of steel wire ropes 36, and the last lifting ring is connected to a sleeve 32 by means of steel wire ropes 36, and the sleeve 32 is also sleeved on the HDPE pipe 31; the HDPE pipe 31 is placed in the limiting groove 37 provided on the arc plate 39, and fastening plates 41 are provided between adjacent arc plates 39; the steel strand 44 to be threaded is wound in the pay-off drum 45, and one end enters the HDPE pipe 31 by means of a wire threading machine 43, and the steel strands at both ends of the HDPE pipe 31 are respectively connected to the tower end anchor and the embedded pipe 35 and the beam end anchor and the embedded pipe 30 to form a threaded steel strand 42.

[0040] The beam end soft and hard traction integrated combination device 49 includes a tensioning rod 50 and a second support leg 57, wherein the beam end anchor and the embedded pipe 30 are connected to the tensioning rod 50, the tensioning rod 50 is placed in the second support leg 57 and fixed by a tensioning end nut 51, a hard traction jack 52 is installed on the second support leg 57, a first support leg 55 is installed on the hard traction jack 52, a soft traction connector 56 is installed in the first support leg 55 by using a soft traction nut 53, and a first support leg 55 is also installed A soft traction jack 54 is installed; wherein the soft traction connector 56 includes an upper disc 60, an elastic support rod 59 and a lower threaded disc 58, the elastic support rod 59 is arranged between the upper disc 60 and the lower threaded disc 58, the upper disc 60 and the lower threaded disc 58 are provided with a through hole 61, the steel strand 42 has passed through the through hole 61 and passes through the soft traction connector 56, the elastic support rod 59 is provided with a spring 62 and a connecting rod 63, and the spring 62 is sleeved on the connecting rod 63.

[0041] Embodiment 2

[0042] As another embodiment, the second embodiment proposes, on the basis of the first embodiment, a more specific solid concrete main tower cable system of a low-tower cable-stayed super-large bridge, including a cap 1, a temporary concrete support column 2, a channel steel support 3, a hanging basket 4, a 0# box beam 5, a main tower 6, a bracket 7, a load-bearing platform 8, a winch 9, a cable hanging construction platform 10, a temporary support 11, a pier 12, a lower base plate 13, a jack 14, a diagonal rod 15, a supporting steel pipe 16, a protective vertical rod 17, a protective horizontal rod 18, an adjustment track 19, an adjustment block 20, a connecting rod 21, an operating platform 22, a lifting ring 23, a traction piece 24, an upper base plate 25, a telescopic plate 26, a bearing 27, an anti-sliding block 28, a chain 29, a beam end anchor and an embedded pipe 30, a HDPE pipe 31, a sleeve 32, a hoisting device 33, and a guide wheel 34. , tower end anchor and embedded pipe 35, wire rope 36, limit groove 37, connecting plate 38, arc plate 39, bolt 40, fastening plate 41, worn steel strand 42, cable threading machine 43, steel strand to be worn 44, pay-off drum 45, movable pulley group 46, fixed pulley group 47, tower end hard traction device 48, beam end soft and hard traction integrated combination device 49, tensioning rod 50, tensioning end nut 51, hard traction jack 52, soft traction nut 53, soft traction jack 54, first support leg 55, soft traction connector 56, second support leg 57, threaded disc 58, elastic support rod 59, disc 60, through hole 61, spring 62, connecting rod 63, anti-rotation device 64, positioning block 65, limit groove 66, pressure plate 67, toothed pattern 68, rib plate 69, positioning vertical rod 70, positioning track 71;

[0043] It involves the use of synchronous cable hanging construction technology of hanging basket, the technology of liftable cable hanging construction platform 10 under the main tower 6, the technology of fast cable hanging by hoisting device 33, and the integrated combination technology of hard traction technology at the tower end + soft and hard traction technology at the beam end.

[0044] When the pier 12 is constructed on the abutment 1, temporary concrete support columns 2 are poured and channel steel supports 3 are installed to form a temporary consolidation system for the main bridge. The system and temporary supports 11 are used to complete the concrete pouring construction of the 0# box girder 5. After the construction of the 0# box girder 5 is completed, the construction of the hanging basket 4 and the main tower 6 is carried out simultaneously, wherein the beam end anchors and embedded pipes 30 are pre-embedded during the construction of the 0# box girder 5, and the tower end anchors and embedded pipes 35 are pre-embedded during the construction of the main tower 6.

[0045] A tower top bracket 7 is provided at the top of the main tower 6, and a load-bearing platform 8 is installed above the bracket 7; the cable-hanging construction platform 10 is arranged on both sides of the main tower 6, and the lifting ring 23 thereon is connected to the movable pulley group 46, and the movable pulley group 46 is respectively connected to the winch 9 and the fixed pulley group 47 on the load-bearing platform 8, thereby forming a cyclic lifting technology to roughly adjust the height of the cable-hanging construction platform 10; the upper bottom plate 25 is welded at both ends of the operating platform 22, and a frame structure is formed with the lower bottom plate 13 using the telescopic plate 26, and a jack 14 is arranged between the lower bottom plate 13 and the operating platform 22 to accurately adjust the height of the cable-hanging construction platform 10; a traction member 24 is installed on the upper bottom plate 25, and a number of supporting steel pipes are arranged between the traction member 24 and the inclined rod 15 16; During the construction process, when the inclined rod 15 connected to the lifting ring 23 breaks, the traction member 24 can be immediately tightened to form a protective barrier, wherein the bottom of the traction member 24 passes through the operating platform 22 and is installed with a bearing 27, and a chain 29 is arranged between the two bearings 27 to form a stable force system; the operating platform 22 has grooves on both sides with adjustment rails 19, and the protective vertical rod 17 is placed in the rail to adjust the relative position through the adjustment block 20 and the anti-sliding block 28 welded at the bottom, and the width of the anti-sliding block 28 is greater than the width of the adjustment rail 19 to ensure that the protective vertical rod 17 can be stably erected; a number of retractable protective cross bars 18 and connecting rods 21 are evenly arranged between the protective vertical rods 17 to form a safe and reliable construction protection system.

[0046] The hoop lifting device 33 is composed of three arc plates 39 welded with a connecting plate 38; three lifting rings 23 are installed on the connecting plate 38 by bolts 40, wherein the first two lifting rings 23 are connected to the guide wheel 34 of the load-bearing platform 8 by steel wire ropes 36, and the last lifting ring is connected to the casing 32 by steel wire ropes 36; the HDPE pipe 31 is placed in the limit groove 37 provided on the arc plate 39, and fastening plates 41 are provided between adjacent arc plates 39, and bolts 40 are installed to ensure the tightness of the device connection; when the HDPE pipe 31 is lifted and installed, the hoisting circulation system is formed by the hoisting device 33, the guide wheel 34 of the load-bearing platform 8 and the winch 9 of the 0# box beam 5, and the steel strand 44 to be worn is paid out through the pay-off drum 45, and the cable threading machine 43 is used to enter the HDPE pipe 31, and is respectively connected to the tower end anchor and the embedded pipe 35, the beam end anchor and the embedded pipe 30, to form the worn steel strand 42.

[0047] The described beam end soft and hard traction integrated combination device 49, wherein the beam end anchor and the embedded pipe 30 are connected to the tensioning rod 50, the tensioning rod 50 is placed in the second support leg 57 and fixed by the tensioning end nut 51, the second support leg 57 is installed with a hard traction jack 52, the first support leg 55 is installed on the hard traction jack 52, the first support leg 55 is installed with a soft traction connector 56 using a soft traction nut 53, and the first support leg 55 is also installed with a soft traction jack; wherein the soft traction connector 56 is composed of an upper disc 60, an elastic support rod 59 and a lower threaded disc 58, the steel strand 42 has passed through the soft traction connector 56 through the through hole 61 on the disc, and the elastic support rod 59 is provided with a spring 62 and a connecting rod 63 inside, which play a role in shock absorption and stability maintenance; when the steel strand 42 has been passed through the beam end for tensioning, the soft traction jack 54 is first used for tensioning, and then the hard traction jack 52 is used for tensioning.

[0048] The tower end hard traction device 48, the tower end anchor and the embedded pipe 35 are connected to the tensioning rod 50, the tensioning rod 50 is connected to the second support leg 57 through the tensioning end nut 51, the second support leg 57 is provided with a hard traction jack 52, and an anti-rotation device 64 is arranged between the tower end anchor and the embedded pipe 35 and the second support leg 57; the anti-rotation device 64 is composed of a pressure plate 67 and a positioning vertical rod 70, the pressure plate 67 has a hole in the middle to form a limiting groove 66, which is placed on the tower end anchor and the embedded pipe 35, and the inner wall of the limiting groove 66 is provided with a serrated pattern 68 to increase friction; the bottom of the positioning vertical rod 70 is welded with a rib plate 69 to strengthen the connection with the pressure plate 67, and the top is welded with a positioning rail 71 to connect and fix with the positioning block 65 arranged on the second support leg 57; when the tower end has been stretched through the steel strand 42, the hard traction jack 52 is directly used for tensioning.

[0049] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0050] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A solid concrete main tower cable system for a low-tower cable-stayed bridge, characterized in that: It includes the cap, HDPE pipe and hoisting device; There are bridge piers on the cap, 0# box beams are cast on the piers, main towers are constructed on the 0# box beams, beam end anchors and embedded pipes are pre-buried on the surface of the 0# box beams, tower end anchors and embedded pipes are pre-buried on both sides of the main towers; a load-bearing platform is set on the top of the main tower, and cable construction platforms are hung on both sides of the main tower. An operating platform is arranged on the cable construction platform through a jack; One end of the HDPE pipe is covered with a clamp lifting device, and the load-bearing platform lifts the clamp lifting device through a steel wire rope. The two ends of the steel strands passed through the HDPE pipe are respectively connected to the tower end anchor and embedded pipe and the beam end anchor and embedded pipe; the beam end where the steel strands have been passed through is connected to the beam end soft and hard traction integrated combination device; the tower end where the steel strands have been passed through is connected to the tower end hard traction device.

2. The solid concrete main tower cable system of the low-tower cable-stayed bridge according to claim 1 is characterized in that: On the described pedestal, temporary concrete support columns are cast around the piers and channel steel supports are installed to form a temporary consolidation system for the main bridge. Temporary supports are arranged on the piers, and 0# box girder concrete is cast on the temporary consolidation system and temporary supports of the main bridge; beam end anchors and embedded pipes are pre-embedded on the surface of the 0# box girder, and tower end anchors and embedded pipes are pre-embedded on both sides of the main tower.

3. The solid concrete main tower cable system of the low-tower cable-stayed bridge according to claim 1 is characterized in that: The top of the main tower is provided with a bracket, and a load-bearing platform is installed above the bracket, and a winch and a fixed pulley group are provided on the load-bearing platform; the cable hanging construction platform is arranged on both sides of the main tower, and the cable hanging construction platform is connected to a movable pulley group through a lifting ring, and the movable pulley group is connected to the winch and the fixed pulley group on the load-bearing platform to form a cyclic lifting system for coarse adjustment of the height of the cable hanging construction platform; a frame structure is provided at each end of the load-bearing platform, and an operating platform is provided between the frame structures, and the frame structure includes an upper bottom plate, a telescopic plate and a lower bottom plate, and the telescopic plate is arranged between the upper bottom plate and the lower bottom plate, and the lower bottom plate is connected to the operating platform A jack is installed between the platforms for fine-tuning the height of the cable-hanging construction platform; a traction piece and an inclined rod are installed on the upper bottom plate, and a number of supporting steel pipes are arranged between the traction piece and the inclined rod; the bottom of the traction piece passes through to the bottom of the operating platform and is installed with a bearing, and a chain is arranged between the two bearings; adjustment rails are slotted on both sides of the operating platform, and protective vertical rods are slidably connected to the adjustment rails, and the bottom of the protective vertical rod is placed on the adjustment rail through an adjustment block and an anti-sliding block, the anti-sliding block extends to the bottom of the operating platform, and the width of the anti-sliding block is greater than the width of the adjustment rail; a number of retractable protective cross bars and connecting rods are evenly distributed between the protective vertical rods.

4. The solid concrete main tower cable system of the low-tower cable-stayed bridge according to claim 1 is characterized in that: Guide wheels are provided on both sides of the load-bearing platform. The hoop lifting device includes an arc plate and a connecting plate, and the arc plate is ring-shaped to form a limiting groove; three lifting rings are installed on the connecting plate by bolts, among which the first two lifting rings are connected to the guide wheels of the load-bearing platform by steel wire ropes, and the last lifting ring is connected to a sleeve by steel wire ropes, and the sleeve is also sleeved on the HDPE pipe; the HDPE pipe is placed in the limiting groove set on the arc plate, and fastening plates are provided between adjacent arc plates; the steel strand to be threaded is wound in the pay-off drum, and one end enters the HDPE pipe by a wire threading machine, and the steel strands at both ends of the HDPE pipe are respectively connected to the tower end anchor and embedded pipe and the beam end anchor and embedded pipe to form threaded steel strands.

5. The solid concrete main tower cable system of the low-tower cable-stayed bridge according to claim 1 is characterized in that: The integrated soft and hard traction combination device at the beam end includes a tensioning rod and a second support leg, wherein the beam end anchor and the embedded pipe are connected to the tensioning rod, the tensioning rod is placed in the second support leg and fixed by a tensioning end nut, a hard traction jack is installed on the second support leg, and the first support leg is installed on the hard traction jack, a soft traction connector is installed in the first support leg using a soft traction nut, and a soft traction jack is also installed on the first support leg; wherein the soft traction connector includes an upper disc, an elastic support rod and a lower threaded disc, the elastic support rod is arranged between the upper disc and the lower threaded disc, through holes are opened on the upper disc and the lower threaded disc, and the steel strands are passed through the through holes through the soft traction connector, a spring and a connecting rod are arranged inside the elastic support rod, and the spring is sleeved on the connecting rod.

6. The solid concrete main tower cable system of the low-tower cable-stayed bridge according to claim 1 is characterized in that: The hard traction device at the tower end includes a tensioning rod and a second support leg. The tower end anchor and the embedded pipe are connected to the tensioning rod. The tensioning rod is connected to the second support leg through a tensioning end nut. A hard traction jack is provided on the second support leg for tensioning the tower end through which the steel strand has been passed. An anti-rotation device is provided between the tower end anchor and the embedded pipe and the second support leg. The anti-rotation device includes a pressure plate and a positioning vertical rod. A hole is opened in the middle of the pressure plate to form a limiting groove. The limiting groove is sleeved on the tower end anchor and the embedded pipe, and a serrated pattern is provided on the inner wall of the limiting groove. A rib plate is welded between the bottom of the positioning vertical rod and the pressure plate, a positioning rail is welded on the top of the positioning vertical rod, a positioning block is provided on the second support leg, and the positioning rail and the positioning block are connected and fixed.

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