CN111593674A - Suspended casting beam cable construction structure and construction method for n-shaped beam bridge - Google Patents
Suspended casting beam cable construction structure and construction method for n-shaped beam bridge Download PDFInfo
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- CN111593674A CN111593674A CN202010536711.6A CN202010536711A CN111593674A CN 111593674 A CN111593674 A CN 111593674A CN 202010536711 A CN202010536711 A CN 202010536711A CN 111593674 A CN111593674 A CN 111593674A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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Abstract
The invention discloses a suspended casting beam cable construction structure of an n-shaped beam bridge, wherein an electric hoist hoisting cable pipeline is arranged on a shaped temporary support; the entrance end of the inclined lower end of the cableway pipe is connected with an anchor backing plate, the inclined lower end of the transition pipe in the cableway pipe penetrates through the anchor backing plate and is connected with a tensioning end anchorage device, the exit end of the cableway pipe is sequentially coaxially connected with a steel taper pipe and an HDPE (high-density polyethylene) stay cable sleeve pipe, the inclined upper end of the HDPE stay cable sleeve pipe extends to a tower column of a cable-stayed bridge, a plurality of extension pipes are arranged in the anchor ring in the transition pipe, the lower end of a stay cable belt PE (polyethylene) steel strand in each extension pipe is anchored in the tensioning end anchorage device, and the upper end of; the tower column of the cable-stayed bridge is provided with an upper connecting steel sleeve and a lining pipe, and a tower column fixing ring is connected with a double-semicircle clamp of the HDPE stay cable sleeve through a steel wire rope. The invention also discloses a construction method, so that the HDPE stay cable sleeve is high in welding processing speed, and the stay cable on the tower column is high in installation efficiency.
Description
Technical Field
The invention relates to the field of suspended casting beam and cable construction of n-shaped beam bridges, in particular to a suspended casting beam and cable construction structure and a suspended casting beam and cable construction method of n-shaped beam bridges.
Background
In the construction process of the cable-stayed bridge, because the construction elevation of the beam body and the control of the internal force seriously affect the driving speed and safety of vehicles in the later period, the linear shape and the control of the internal force of the bridge are mutually restricted, which becomes a difficult point for preventing the rapid transportation of traffic. The bridge linear control is not only an important component of the bridge construction technology, but also a key for ensuring the macroscopic construction and quality control of the bridge and the safety guarantee of the bridge construction.
The structure of large-span cable-stayed bridge is complicated, and in the construction process, the following problems often exist: (1) the HDPE sleeve has low on-site welding processing efficiency and loose splicing seam; (2) because the weight of the cable duct pipe and the stay cable is large, the angle adjustment is difficult in the installation process of the beam surface; (3) the construction platform of the stay cable on the tower column is not firmly fixed, and the stay cable and the upper cable saddle are difficult to install.
In view of this, in order to improve the welding processing efficiency and quality of the on-site HDPE casing pipes, facilitate angle adjustment of the cable duct pipes and the stay cables, and enhance the firmness and safety of the tower column construction platform, the invention provides a simple and effective auxiliary structure and construction method for cantilever casting beams and cables of an n-shaped beam bridge.
Disclosure of Invention
The invention aims to provide a suspended casting beam cable construction structure and a construction method for an n-shaped beam bridge, which are used for improving the welding processing efficiency and quality of HDPE (high-density polyethylene) sleeves on site, facilitating the angle adjustment of cable duct pipes and stay cables and enhancing the firmness and safety of a tower column construction platform
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
II type beam bridge hangs and waters beam cable construction structures, its characterized in that: the method comprises the following steps:
the sizing temporary support is vertically fixed on the middle bin steel bars of the cable-stayed bridge, and an electric hoist is arranged on the sizing temporary support to obliquely lift the cable duct;
the inclined lower end of the cableway pipe is embedded into a concrete girder of the cable-stayed bridge in advance, the inclined lower end of the cableway pipe is an inlet, the inlet end of the cableway pipe is connected with an anchor backing plate, the anchor backing plate is fixedly connected with a steel bar inside the concrete girder, a transition pipe is coaxially arranged inside the cableway pipe close to the inlet, the range inside the transition pipe is used as an anchor transition area, the inclined lower end of the transition pipe penetrates through the anchor backing plate and is coaxially and fixedly connected with a tensioning end anchor, an anchor ring is coaxially arranged inside the transition pipe, a plurality of extension pipe holes which are parallel to the axial direction of the anchor ring and penetrate through the anchor ring are arranged in the anchor ring, extension pipes coaxially penetrate through the extension pipe holes respectively, the inclined lower end of each extension pipe penetrates into the tensioning end anchor respectively, the inclined upper end of each extension pipe penetrates out of the inclined upper end of the transition pipe into the cableway pipe respectively;
the inclined upper end of each cable stay belt PE steel strand penetrates through the steel cone pipe and extends to the tower column of the cable-stayed bridge along the HDPE cable sleeve;
an inclined liner tube is embedded in a tower column of the cable-stayed bridge, the inclined lower end of the liner tube extends to the surface of the tower column and is connected with an embedded steel plate, the embedded steel plate is fixed on the surface of the tower column, the embedded steel plate is outwards connected with an upper connecting steel sleeve coaxial with the liner tube, the tower column is positioned below the upper connecting steel sleeve and is connected with a construction platform, the inclined upper end of the HDPE stayed cable sleeve extends to the upper connecting steel sleeve, a space for connecting and installing the inclined upper end of the HDPE stayed cable sleeve is provided in the upper connecting steel sleeve, and the inclined upper end of a stay cable belt PE steel strand provided in the liner tube penetrates through the embedded steel plate and then is connected and fixed with a space, the inclined upper end of the HDPE stay cable sleeve is coaxially sleeved with a thermal expansion HDPE pipe, the thermal expansion HDPE pipe is coaxially sleeved with a double-semicircle hoop, the surface of the tower column is positioned above the upper-joint steel sleeve and is fixedly provided with a fixing ring, and the fixing ring is connected with the double-semicircle hoop through a steel wire rope so as to temporarily lock and fix the HDPE stay cable sleeve.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the top of the standardized temporary support is provided with a plurality of electric hoists in a hanging mode, a steel wire rope of each electric hoist is connected with a steel sleeve ring, the steel sleeve rings are sleeved on the cable duct pipe, and the cable duct pipe is obliquely hoisted through the electric hoists.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the HDPE suspension cable sleeve is formed by welding a plurality of HDPE pipe end opposite ends, every two adjacent HDPE pipes are respectively arranged on a fixing frame and a pushing wheel on the pipe welding machine, the butt joints of the two adjacent HDPE pipes are supported by a reinforcing plate, and welding seams are formed at the butt joints of the two adjacent HDPE pipes after welding.
II type beam bridge hang and water beam cable construction structures, its characterized in that: an O-shaped sealing ring is arranged between the transition pipe and the anchor ring, and a plurality of limiting ends are arranged between the cable channel pipe and the transition pipe to limit the transition pipe.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the inclined lower end of the tensioning end anchorage device is coaxially connected with a protective cover through a steel nail, the inclined lower end of each cable-stayed belt PE steel strand penetrates through the tensioning end anchorage device and penetrates into the protective cover, the part of each cable-stayed belt PE steel strand, which is inclined in the tensioning end anchorage device, is anchored through a clamping piece, and the protective cover is filled with anti-corrosive grease.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the outer wall of the tensioning end anchorage device is formed with external threads, a tensioning adjusting nut is screwed on the tensioning end anchorage device, and the tensioning end anchorage device is locked on the anchor backing plate by the tensioning adjusting nut.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the inner part of the cableway pipe close to the outlet is coaxially provided with a shock absorber.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the liner tube in the tower column of the cable-stayed bridge consists of an inner liner tube and an outer liner tube coaxially sleeved outside the inner liner tube.
II type beam bridge hang and water beam cable construction structures, its characterized in that: the construction platform is tied up on the pylon through the steel wire, the position that the pylon outer wall is located the construction platform below encircles there is the staple bolt steel sheet, the both ends of staple bolt steel sheet are connected with enhancement fore shaft board respectively, strengthen connecting bolt through excelling in between the fore shaft board and connect, the construction platform bottom is arranged in on the enhancement fore shaft board that the staple bolt steel sheet is connected, the construction platform bottom still is fixed with the bottom girder steel, the surface of the pylon is located the pre-buried built-in fitting that is fixed with in staple bolt steel sheet below, the bottom girder steel, be connected with the angle steel of double pin between the pre-built-in fitting and carry out the.
A construction method for cantilever casting of a beam cable of an n-shaped beam bridge is characterized by comprising the following steps: the method comprises the following steps:
(1) and construction preparation: preparing a storage and assembly site, stacking a stay cable belt PE steel strand, an HDPE stay cable sleeve, a cable duct pipe and a tensioning end anchorage device, prefabricating a shaped temporary support frame, an anchor ear steel plate and a construction platform in advance, and taking measures for preventing materials from being damaged, preventing plastic components from being deformed by heating and preventing iron components from being rusted by damp;
(2) and prefabricating an anchorage device: cutting an extension pipe according to the length of the extension pipe required by each anchor device transition area, installing the extension pipe on an anchor ring, calibrating an extension pipe bundle, plugging a steel pipe or a hard plastic pipe into the extension pipe to ensure verticality, selecting a correct transition pipe according to the type of the anchor ring and covering the extension pipe with the transition pipe, ensuring that an O-shaped sealing ring is correctly installed between the transition pipe and the anchor ring, and manufacturing high-strength cement grout between the extension pipe and the transition pipe;
(3) welding the HDPE outer sleeve: calculating the length of an HDPE pipe required by each cable, welding the HDPE pipe in an assembly area by using a pipe welding machine to obtain an HDPE stay cable sleeve, and neatly placing the HDPE stay cable sleeve after welding;
(4) hoisting the cable channel pipe: when the bridge deck beam steel bars are bound, a middle bin channel is preset, the position of installation of the cable channel pipe is reserved, a shaped temporary support frame formed by welding angle steel in advance is hung to the middle bin, the shaped temporary support frame is welded with the middle bin steel bars, an electric hoist is installed on the shaped temporary support frame, a steel lantern ring is sleeved on the cable channel pipe, the cable channel pipe is obliquely hung through the electric hoist, the angle of the cable channel pipe is adjusted, and the cable channel pipe is placed in the position designed by the concrete main beam.
(5) And installing a tower column construction platform: the anchor ear steel plate prefabricated in advance is hoisted, installed on the tower column according to the designed position, the construction platform is hoisted after the position of the anchor ear steel plate is verified, the construction platform is placed on a reinforced locking opening plate of the anchor ear steel plate, the upper part of the construction platform is bound with the tower column through a steel wire, and the bottom cross beam is hinged with double-spliced angle steel which is connected with an embedded part embedded in the surface of the tower column.
(6) Installing an upper connecting steel sleeve: after the tower column construction platform is installed, hoisting the upper connecting steel sleeve, and connecting the upper connecting steel sleeve with an embedded steel plate in the tower column through a high-strength bolt;
(7) hoisting the HDPE outer sleeve: sleeving a heat-expansion HDPE pipe on the end part of a welded HDPE stay cable sleeve, arranging a double-semicircle hoop outside the heat-expansion HDPE pipe, drawing the HDPE stay cable sleeve to the opening of a steel sleeve pipe on a tower column by a tower crane, connecting the double-semicircle hoop by a fixing ring on the tower column, and temporarily locking the HDPE stay cable sleeve;
(8) and installing bridge deck anchorage devices: mounting a prefabricated anchorage device on a structure in the concrete main beam according to the direction of an anchorage device hole site, connecting an anchor backing plate with a steel bar in the concrete main beam, and dynamically adjusting the tightness of a tensioning adjusting nut on the anchorage device;
(9) and threading: and when the strength of the current section of concrete girder reaches more than% of the design value and the prestress tension of the section is finished, the stay cable is installed. Installing a winch, a steel strand plate and an eccentric wheel at two ends of a concrete main beam, drawing a PE steel strand of a stay cable belt by the winch to pass through an HDPE stay cable sleeve, a tower column and a cableway pipe to a bridge floor at the other end, installing the PE steel strand of the stay cable belt into an anchorage at a tensioning end, and installing a clamping piece for anchoring;
(10) tensioning: when the PE steel twisted wires of the stay cable belts are installed, hydraulic jacks are adopted to stretch the PE steel twisted wires of the stay cable belts one by one according to designed cable force, and during stretching, the stretching force, the deformation of a concrete main beam and the deformation of a tower column are monitored at any time so as to prevent the PE steel twisted wires of the stay cable belts from exceeding the specified deviation; repeating the operation until all the stay cable belts with the PE steel strand wires are installed, and installing and connecting the HDPE stay cable sleeve with the concrete main beam and the cableway pipe of the tower column;
(11) final assembly and protection: and after the final cable force is finished, jacking and pressing the clamping piece at the anchoring end of the concrete girder, cutting off the redundant stay cable with the PE steel hinge wire at the anchoring end, installing a protective cover, connecting the edge part of the protective cover with the anchorage at the tensioning end through a steel nail, and injecting anti-corrosion grease into the protective cover.
The invention has the following characteristics and beneficial effects:
(1) the high-density polyethylene outer sleeve (HDPE) is constructed by adopting a shaped jig frame for rapid welding
The sleeve welding speed is high, and the welding quality is good.
(2) The invention adopts the shaped temporary support frame to assist the installation of the stay cable bundle and the cableway pipe, the angle adjustment is convenient when the stay cable bundle and the cableway pipe crane are installed, and the construction efficiency is high.
(3) According to the invention, the anchor ear steel plate is matched with the double-spliced angle steel and the steel wire to assist in supporting the tower column construction platform, the construction platform is firmly fixed, and the stay cable on the tower column is conveniently and quickly installed.
Drawings
FIG. 1 is a schematic view of a shaped jig welded HDPE pipe;
FIG. 2 is a plan view of the tension end anchor ring;
FIG. 3 is a schematic view of the extension pipe and anchor ring assembly;
FIG. 4 is a schematic view of a shaped temporary support frame for hoisting a cableway pipe;
FIG. 5 is a view of the anchoring of the ends of the stay cables of the concrete main beams;
FIG. 6 is a structural diagram of an HDPE pipe installed in a tower column construction platform in an auxiliary manner;
FIG. 7 is a sectional view of the hoop steel plate and the tower shown in FIG. 6;
wherein: 1-stayed cable with PE steel strand; 2-HDPE stayed cable sleeve; 3-a steel conical pipe; 4-a shock absorber; 5-a cable duct; 6-concrete girder; 7-an extension tube; 8-a transition pipe; 9-high strength cement; 10-a limiting end; 11-anchor backing plate; 12-tensioning the adjusting nut; 13-a clip; 14-anti-corrosive grease; 15-tensioning end anchorage; 16-a protective cover; 17-steel nails; 18-a column; 19-an outer liner tube; 20-pre-burying a steel plate; 21-middle bin reinforcing steel bars; 22-lining tube; 23-extended tube holes; 24-an anchor ring; 25-a fixing frame; 26-HDPE pipe; 27-a pipe welding machine; 28-a push wheel; 29-heating plate; 30-a weld; 31-thermally expanded HDPE pipe; 32-double semicircular hoops; 33-connecting a steel sleeve; 34-a steel wire rope; 35-a fixed ring; 36-high strength bolts; 37-steel wire; 38-anchor ear steel plate; 39-construction platform; 40-bottom cross beam; 41-double angle steel; 42-high strength locking bolt; 43-reinforced locking plate; 44-embedded parts; 45-electric hoist; 46-a steel collar; 47-finalized temporary support.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
II type beam bridge hangs and waters beam cable construction structures includes:
as shown in fig. 4, the shaped temporary support 47 is vertically fixed on the middle bin steel bar 21 of the cable-stayed bridge, and the electric hoist 45 is arranged on the shaped temporary support 47 to hoist the cable duct 5;
as shown in fig. 2, 3 and 5, the inclined lower end of the cableway pipe 5 is pre-embedded into the concrete main beam 6 of the cable-stayed bridge, the inclined lower end of the cableway pipe 5 is an inlet, the inlet end of the cableway pipe 5 is connected with an anchor backing plate 11, the anchor backing plate 11 is fixedly connected with the steel bars inside the concrete main beam 6, a transition pipe 8 is coaxially installed inside the cableway pipe 5 close to the inlet, the range inside the transition pipe 8 is used as an anchor transition area, the inclined lower end of the transition pipe 8 penetrates through the anchor backing plate 11 and is coaxially and fixedly connected with a tensioning end anchor 15, an anchor ring 24 is coaxially installed inside the transition pipe 8, a plurality of extension pipe holes 23 which are parallel to the axial direction of the anchor ring 24 and penetrate through the anchor ring 24 are arranged in the anchor ring 24, an extension pipe 7 coaxially penetrates through each extension pipe hole 23, the inclined lower end of the extension pipe 7 respectively penetrates into the tensioning end anchor 15, the inclined upper end of each extension pipe 7 penetrates through the inclined upper end of the, high-strength cement 9 is filled in the space between the transition pipe 8 and the extension pipe 7;
the inclined upper end of the cable duct pipe 5 is an outlet, the outlet end of the cable duct port 5 is coaxially connected with a steel taper pipe 3, the steel taper pipe 3 is connected with the outlet end of the cable duct pipe 5 through the radially larger end of the steel taper pipe 3, the radially smaller end of the steel taper pipe 3 is coaxially connected with an HDPE (high-density polyethylene) stay cable sleeve 2, the inclined upper end of the HDPE stay cable sleeve 2 extends to a tower column 18 of the cable-stayed bridge, a stay cable belt PE steel strand 1 is coaxially arranged in each extension pipe respectively, the inclined lower end of each stay cable belt PE steel strand 1 penetrates into a tension end anchorage device 15 respectively, the inclined lower end of each stay cable belt PE steel strand 1 is anchored in the tension end anchorage device 15 through a clamping piece 13, and the inclined upper end of each stay cable belt PE steel strand 1 penetrates through the steel taper pipe 3 and extends to the tower column 18 of the cable-stayed bridge along the inside of the HDPE stay cable sleeve 2;
as shown in fig. 6 and 7, an inclined liner tube is pre-embedded in a tower column 18 of a cable-stayed bridge, the inclined lower end of the liner tube extends to the surface of the tower column 18 and is connected with a pre-embedded steel plate 20, the pre-embedded steel plate 20 is fixed on the surface of the tower column 18 through a high-strength bolt 36, the pre-embedded steel plate 20 is externally connected with an upper connecting steel sleeve 33 coaxial with the liner tube, a construction platform is connected to the position of the tower column 18 below the upper connecting steel sleeve 33, the inclined upper end of an HDPE stayed cable sleeve 2 extends to the upper connecting steel sleeve 33, a space for connecting and installing the inclined upper end of the HDPE stayed cable sleeve 2 is provided inside the upper connecting steel sleeve 33, a space for connecting and fixing the inclined upper end of a stayed cable belt PE stranded wire 1 passing through the pre-embedded steel plate 20 is provided inside the liner tube, a thermally expanded HDPE pipe 31 is coaxially sleeved on the inclined upper end of the HDPE stayed cable sleeve 2, a double semi-circle 32 is coaxially sleeved outside the thermally expanded HDPE pipe 31, the fixing ring 35 is connected with the double semicircular clips 32 through the steel wire rope 34 to temporarily lock the HDPE stay cable sleeve 2.
As shown in fig. 5, a plurality of electric hoists 45 are suspended on the top of the standardized temporary support 47, the steel wire rope 34 of each electric hoist 45 is connected with a steel collar 46, the steel collar 46 is sleeved on the cable duct 5, and the cable duct 5 is obliquely lifted by the electric hoists 45.
As shown in fig. 1, the HDPE stayed cable sleeve 2 is formed by welding a plurality of HDPE pipes 26 end to end, every two adjacent HDPE pipes 26 are respectively arranged on a fixed frame 25 and a pushing wheel 28 on a pipe welding machine 27, the butt joint of the two adjacent HDPE pipes 26 is supported by a reinforcing plate 29, and a welding seam 30 is formed at the butt joint of the two adjacent HDPE pipes 26 after welding.
In the invention, an O-shaped sealing ring is arranged between the transition pipe 8 and the anchor ring 24, and a plurality of limiting ends 10 are arranged between the cableway pipe 5 and the transition pipe 8 to limit the transition pipe 8.
In the invention, the inclined lower end of the anchorage device 15 at the tensioning end is coaxially connected with a protective cover 16 through a steel nail 17, the inclined lower end of each PE steel strand 1 passes through the anchorage device 15 at the tensioning end and penetrates into the protective cover 16, the part of each PE steel strand 1, which is inclined in the anchorage device 15 at the tensioning end, is anchored through a clamping piece 13, and the protective cover 16 is filled with anti-corrosive grease 14.
In the invention, external threads are formed on the outer wall of the tensioning end anchorage device 15, the tensioning end anchorage device 15 is screwed with the tensioning adjusting nut 12, and the tensioning end anchorage device 15 is locked on the anchor backing plate 11 by the tensioning adjusting nut 12.
In the invention, a damper 4 is coaxially arranged in the cableway pipe 5 near the outlet.
In the invention, the liner tube in the tower column 18 of the cable-stayed bridge is composed of an inner liner tube 22 and an outer liner tube 19 coaxially sleeved outside the inner liner tube 22,
according to the invention, a construction platform 39 is bound on a tower column 18 through a steel wire 37, an anchor ear steel plate 38 is encircled on the outer wall of the tower column 18 at a position below the construction platform 39, two ends of the anchor ear steel plate 38 are respectively connected with reinforced locking hole plates 43, the reinforced locking hole plates 43 are connected through high-strength fastening bolts 42, the bottom of the construction platform 39 is arranged on the reinforced locking hole plates 43 connected with the anchor ear steel plate 38, a bottom steel beam 40 is also fixed at the bottom of the construction platform 39, embedded parts 44 are embedded and fixed on the surface of the tower column 18 below the anchor ear steel plate 38, and double-spliced angle steel 41 is connected between the bottom steel beam 40 and the embedded parts 44 for reinforcing and supporting.
A construction method for cantilever casting of a beam cable of an n-shaped beam bridge comprises the following steps:
(1) and construction preparation: preparing a storage and assembly site, stacking a stay cable belt PE steel strand 1, an HDPE stay cable sleeve 2, a cableway pipe 5 and a tensioning end anchorage device 15, prefabricating a shaped temporary support frame 47, an anchor ear steel plate 38 and a construction platform 39 in advance, and taking measures for preventing materials from being damaged, plastic components from being deformed by heating and iron components from being wetted and rusted;
(2) and prefabricating an anchorage device: cutting the extension pipe 7 according to the length of the extension pipe 7 required by each anchorage device transition area, installing the extension pipe 7 on an anchor ring 24, calibrating an extension pipe bundle, plugging a steel pipe or a hard plastic pipe into the extension pipe 7 to ensure verticality, selecting a correct transition pipe 8 according to the type of the anchor ring, covering the extension pipe 7 with the transition pipe 8, ensuring that an O-shaped sealing ring is correctly installed between the transition pipe 8 and the anchor ring 24, manufacturing high-strength cement 9, and grouting between the extension pipe 7 and the transition pipe 8;
(3) welding the HDPE outer sleeve: calculating the length of an HDPE pipe 26 required by each cable, welding the HDPE pipe 26 by using a pipe welding machine 27 in an assembly area to obtain an HDPE stay cable sleeve 2, and neatly placing the HDPE stay cable sleeve after welding;
(4) hoisting the cable channel pipe: when the bridge deck beam steel bars are bound, a middle bin channel is preset, the position of installation of the cable duct pipe 5 is reserved, a shaped temporary support frame 47 formed by welding angle steel in advance is hung to the middle bin, the shaped temporary support frame 47 is welded with the middle bin steel bars 21, an electric hoist 45 is installed on the shaped temporary support frame 47, a steel sleeve ring 46 is sleeved on the cable duct pipe 5, the cable duct pipe 5 is obliquely hung through the electric hoist 45, the angle of the cable duct pipe 5 is adjusted, and the cable duct pipe is placed in the position designed by the concrete main beam 6.
(5) And installing a tower column construction platform: the method comprises the steps of hoisting an anchor ear steel plate 38 prefabricated in advance, installing the anchor ear steel plate on a tower column 18 according to a designed position, hoisting a construction platform 39 after the position is verified, placing the construction platform 39 on a reinforcing locking opening plate 43 of the anchor ear steel plate 38, binding the upper part of the construction platform 39 with the tower column 18 through a steel wire 37, and connecting a bottom cross beam 40 with double-spliced angle steel 41 in a hinged mode and an embedded part 44 embedded in the surface of the tower column 18.
(6) Installing an upper connecting steel sleeve: after the tower column construction platform 39 is installed, the upper steel sleeve 33 is lifted, and is connected with the embedded steel plate 20 in the tower column 18 through the high-strength bolt 36;
(7) hoisting the HDPE outer sleeve: sleeving the end part of the welded HDPE stay cable sleeve 2 on a thermal expansion HDPE pipe 31, arranging a double-semicircle hoop 32 outside the thermal expansion HDPE pipe 31, drawing the HDPE stay cable sleeve 2 to the pipe orifice of a steel sleeve 33 on a tower column 18 by a tower crane, connecting the double-semicircle hoop 32 through a fixing ring 35 on the tower column 18, and temporarily locking the HDPE stay cable sleeve 2;
(8) and installing bridge deck anchorage devices: mounting a prefabricated anchorage device on a structure in the concrete main beam 6 according to the direction of an anchorage device hole site, connecting an anchor backing plate 11 and a steel bar in the concrete main beam 6 together, and dynamically adjusting the tightness of a tensioning adjusting nut 12 on the anchorage device;
(9) and threading: and when the strength of the current section of concrete girder 6 reaches more than 90% of the design value and the prestress tension of the section is finished, the stay cable is installed. A winch, a steel strand plate and an eccentric wheel are installed at two ends of a concrete main beam 6, the winch pulls a stay cable belt PE steel strand 1 to pass through an HDPE stay cable sleeve 2, a tower column 18 and a cable duct pipe 5 to a bridge floor at the other end, the stay cable belt PE steel strand 1 is installed in a tensioning end anchorage device 15, and a clamping piece 13 is installed for anchoring;
(10) tensioning: when the PE steel hinge wires 1 of the stay cable belts are installed, hydraulic jacks are adopted to stretch the PE steel hinge wires 1 of the stay cable belts one by one according to the designed cable force, and during stretching, the stretching force, the deformation of the concrete main beam 6 and the deformation of the tower column 18 are monitored at any time to prevent the specified deviation from being exceeded; repeating the operations until all the stay cable belts PE steel strand wires 1 are installed, and installing and connecting the HDPE stay cable sleeve 2 with the concrete main beam 6 and the cableway pipe 5 of the tower column 18;
(11) final assembly and protection: and after the final cable force is finished, jacking and pressing the clamping piece 13 at the anchoring end of the concrete girder 6, cutting off the redundant stay cable with the PE steel hinge wire 1 at the anchoring end, installing a protective cover 16, connecting the edge part of the protective cover 16 with an anchorage 15 at the tensioning end through a steel nail 17, and pressing and injecting anticorrosive grease 14 into the protective cover 16.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (10)
1. II type beam bridge hangs and waters beam cable construction structures, its characterized in that: the method comprises the following steps:
the sizing temporary support is vertically fixed on the middle bin steel bars of the cable-stayed bridge, and an electric hoist is arranged on the sizing temporary support to obliquely lift the cable duct;
the inclined lower end of the cableway pipe is embedded into a concrete girder of the cable-stayed bridge in advance, the inclined lower end of the cableway pipe is an inlet, the inlet end of the cableway pipe is connected with an anchor backing plate, the anchor backing plate is fixedly connected with a steel bar inside the concrete girder, a transition pipe is coaxially arranged inside the cableway pipe close to the inlet, the range inside the transition pipe is used as an anchor transition area, the inclined lower end of the transition pipe penetrates through the anchor backing plate and is coaxially and fixedly connected with a tensioning end anchor, an anchor ring is coaxially arranged inside the transition pipe, a plurality of extension pipe holes which are parallel to the axial direction of the anchor ring and penetrate through the anchor ring are arranged in the anchor ring, extension pipes coaxially penetrate through the extension pipe holes respectively, the inclined lower end of each extension pipe penetrates into the tensioning end anchor respectively, the inclined upper end of each extension pipe penetrates out of the inclined upper end of the transition pipe into the cableway pipe respectively;
the inclined upper end of each cable stay belt PE steel strand penetrates through the steel cone pipe and extends to the tower column of the cable-stayed bridge along the HDPE cable sleeve;
an inclined liner tube is embedded in a tower column of the cable-stayed bridge, the inclined lower end of the liner tube extends to the surface of the tower column and is connected with an embedded steel plate, the embedded steel plate is fixed on the surface of the tower column, the embedded steel plate is outwards connected with an upper connecting steel sleeve coaxial with the liner tube, the tower column is positioned below the upper connecting steel sleeve and is connected with a construction platform, the inclined upper end of the HDPE stayed cable sleeve extends to the upper connecting steel sleeve, a space for connecting and installing the inclined upper end of the HDPE stayed cable sleeve is provided in the upper connecting steel sleeve, and the inclined upper end of a stay cable belt PE steel strand provided in the liner tube penetrates through the embedded steel plate and then is connected and fixed with a space, the inclined upper end of the HDPE stay cable sleeve is coaxially sleeved with a thermal expansion HDPE pipe, the thermal expansion HDPE pipe is coaxially sleeved with a double-semicircle hoop, the surface of the tower column is positioned above the upper-joint steel sleeve and is fixedly provided with a fixing ring, and the fixing ring is connected with the double-semicircle hoop through a steel wire rope so as to temporarily lock and fix the HDPE stay cable sleeve.
2. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the top of the standardized temporary support is provided with a plurality of electric hoists in a hanging mode, a steel wire rope of each electric hoist is connected with a steel sleeve ring, the steel sleeve rings are sleeved on the cable duct pipe, and the cable duct pipe is obliquely hoisted through the electric hoists.
3. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the HDPE suspension cable sleeve is formed by welding a plurality of HDPE pipe end opposite ends, every two adjacent HDPE pipes are respectively arranged on a fixing frame and a pushing wheel on the pipe welding machine, the butt joints of the two adjacent HDPE pipes are supported by a reinforcing plate, and welding seams are formed at the butt joints of the two adjacent HDPE pipes after welding.
4. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: an O-shaped sealing ring is arranged between the transition pipe and the anchor ring, and a plurality of limiting ends are arranged between the cable channel pipe and the transition pipe to limit the transition pipe.
5. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the inclined lower end of the tensioning end anchorage device is coaxially connected with a protective cover through a steel nail, the inclined lower end of each cable-stayed belt PE steel strand penetrates through the tensioning end anchorage device and penetrates into the protective cover, the part of each cable-stayed belt PE steel strand, which is inclined in the tensioning end anchorage device, is anchored through a clamping piece, and the protective cover is filled with anti-corrosive grease.
6. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the outer wall of the tensioning end anchorage device is formed with external threads, a tensioning adjusting nut is screwed on the tensioning end anchorage device, and the tensioning end anchorage device is locked on the anchor backing plate by the tensioning adjusting nut.
7. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the inner part of the cableway pipe close to the outlet is coaxially provided with a shock absorber.
8. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the liner tube in the tower column of the cable-stayed bridge consists of an inner liner tube and an outer liner tube coaxially sleeved outside the inner liner tube.
9. The cantilever beam cable construction structure of an n-type beam bridge according to claim 1, wherein: the construction platform is tied up on the pylon through the steel wire, the position that the pylon outer wall is located the construction platform below encircles there is the staple bolt steel sheet, the both ends of staple bolt steel sheet are connected with enhancement fore shaft board respectively, strengthen connecting bolt through excelling in between the fore shaft board and connect, the construction platform bottom is arranged in on the enhancement fore shaft board that the staple bolt steel sheet is connected, the construction platform bottom still is fixed with the bottom girder steel, the surface of the pylon is located the pre-buried built-in fitting that is fixed with in staple bolt steel sheet below, the bottom girder steel, be connected with the angle steel of double pin between the pre-built-in fitting and carry out the.
10. A construction method for cantilever casting of a beam cable of an n-shaped beam bridge is characterized by comprising the following steps: the method comprises the following steps:
(1) and construction preparation: preparing a storage and assembly site, stacking a stay cable belt PE steel strand, an HDPE stay cable sleeve, a cable duct pipe and a tensioning end anchorage device, prefabricating a shaped temporary support frame, an anchor ear steel plate and a construction platform in advance, and taking measures for preventing materials from being damaged, preventing plastic components from being deformed by heating and preventing iron components from being rusted by damp;
(2) and prefabricating an anchorage device: cutting an extension pipe according to the length of the extension pipe required by each anchor device transition area, installing the extension pipe on an anchor ring, calibrating an extension pipe bundle, plugging a steel pipe or a hard plastic pipe into the extension pipe to ensure verticality, selecting a correct transition pipe according to the type of the anchor ring and covering the extension pipe with the transition pipe, ensuring that an O-shaped sealing ring is correctly installed between the transition pipe and the anchor ring, and manufacturing high-strength cement grout between the extension pipe and the transition pipe;
(3) welding the HDPE outer sleeve: calculating the length of an HDPE pipe required by each cable, welding the HDPE pipe in an assembly area by using a pipe welding machine to obtain an HDPE stay cable sleeve, and neatly placing the HDPE stay cable sleeve after welding;
(4) hoisting the cable channel pipe: when bridge deck beam steel bars are bound, presetting a middle bin channel, reserving the position for installing a cable pipe, hoisting a shaped temporary support frame formed by welding angle steel in advance to the middle bin, welding the shaped temporary support frame and the middle bin steel bars, installing an electric hoist on the shaped temporary support frame, sleeving a steel lantern ring on the cable pipe, obliquely hoisting the cable pipe through the electric hoist, adjusting the angle of the cable pipe, and placing the cable pipe into the designed position of a concrete main beam;
(5) and installing a tower column construction platform: hoisting an anchor ear steel plate prefabricated in advance, installing the anchor ear steel plate on a tower column according to a designed position, hoisting a construction platform after the position is verified, placing the construction platform on a reinforced locking notch plate of the anchor ear steel plate, binding the upper part of the construction platform with the tower column through a steel wire, and connecting a bottom cross beam with double-spliced angle steel in a hinged mode with an embedded part embedded in the surface of the tower column;
(6) installing an upper connecting steel sleeve: after the tower column construction platform is installed, hoisting the upper connecting steel sleeve, and connecting the upper connecting steel sleeve with an embedded steel plate in the tower column through a high-strength bolt;
(7) hoisting the HDPE outer sleeve: sleeving a heat-expansion HDPE pipe on the end part of a welded HDPE stay cable sleeve, arranging a double-semicircle hoop outside the heat-expansion HDPE pipe, drawing the HDPE stay cable sleeve to the opening of a steel sleeve pipe on a tower column by a tower crane, connecting the double-semicircle hoop by a fixing ring on the tower column, and temporarily locking the HDPE stay cable sleeve;
(8) and installing bridge deck anchorage devices: mounting a prefabricated anchorage device on a structure in the concrete main beam according to the direction of an anchorage device hole site, connecting an anchor backing plate with a steel bar in the concrete main beam, and dynamically adjusting the tightness of a tensioning adjusting nut on the anchorage device;
(9) and threading: when the strength of the current section of concrete girder reaches more than% of a design value and the prestress tension of the section is finished, the stay cable is installed, a winch, a steel strand plate and an eccentric wheel are installed at two ends of the concrete girder, the winch pulls the PE steel strand of the stay cable to pass through an HDPE stay cable sleeve, a tower column and a cableway pipe to the bridge floor at the other end, the PE steel strand of the stay cable is installed in an anchorage device at the tensioning end, and a clamping piece is installed for anchoring;
(10) tensioning: when the PE steel twisted wires of the stay cable belts are installed, hydraulic jacks are adopted to stretch the PE steel twisted wires of the stay cable belts one by one according to designed cable force, and during stretching, the stretching force, the deformation of a concrete main beam and the deformation of a tower column are monitored at any time so as to prevent the PE steel twisted wires of the stay cable belts from exceeding the specified deviation; repeating the operation until all the stay cable belts with the PE steel strand wires are installed, and installing and connecting the HDPE stay cable sleeve with the concrete main beam and the cableway pipe of the tower column;
(11) final assembly and protection: and after the final cable force is finished, jacking and pressing the clamping piece at the anchoring end of the concrete girder, cutting off the redundant stay cable with the PE steel hinge wire at the anchoring end, installing a protective cover, connecting the edge part of the protective cover with the anchorage at the tensioning end through a steel nail, and injecting anti-corrosion grease into the protective cover.
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| CN113356018A (en) * | 2021-06-22 | 2021-09-07 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of rigid-flexible combined pull rod structure for improving prestress effect of stay cable |
| CN114436116A (en) * | 2022-02-10 | 2022-05-06 | 中铁广州工程局集团有限公司 | Hanging method for ultra-long and ultra-heavy steel strand stay cable |
| CN114775430A (en) * | 2022-04-13 | 2022-07-22 | 江阴法尔胜住电新材料有限公司 | Steel strand tie rod cable system with layered wire-dividing supporting structure and installation method |
| CN115045190A (en) * | 2022-06-01 | 2022-09-13 | 中冶天工集团有限公司 | Steel anchor box mounting mechanism and mounting method |
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| CN113356017A (en) * | 2021-06-22 | 2021-09-07 | 上海市城市建设设计研究总院（集团）有限公司 | Rigid-flexible combined pull rod structure for improving prestress effect of stay cable |
| CN113356018A (en) * | 2021-06-22 | 2021-09-07 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of rigid-flexible combined pull rod structure for improving prestress effect of stay cable |
| CN113356017B (en) * | 2021-06-22 | 2023-03-31 | 上海市城市建设设计研究总院（集团）有限公司 | Rigid-flexible combined pull rod structure for improving prestress effect of stay cable |
| CN113356018B (en) * | 2021-06-22 | 2023-03-31 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of rigid-flexible combined pull rod structure for improving prestress effect of stay cable |
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| CN115045190A (en) * | 2022-06-01 | 2022-09-13 | 中冶天工集团有限公司 | Steel anchor box mounting mechanism and mounting method |
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Application publication date: 20200828 |