CN102691266B - Construction Method of Superelevation Composite Support in Cast-in-place Section of Side Span of Bridge - Google Patents

Abstract

The invention provides a construction method of a bridge side-span cast-in-place section ultrahigh combined support, which comprises a beam-column type support, wherein a stand column of the beam-column type support is fixedly connected with a bridge transition pier body through a connecting rod, the combined support also comprises two cantilever brackets fixed on the bridge transition pier body, bearing beams are arranged on the stand column and the cantilever brackets of the beam-column type support, and longitudinal beams are arranged on the bearing beams. The invention organically combines the beam column type support and the cantilever bracket, has strong bearing capacity and large range of the use height, and is suitable for T-shaped rigid frames and cantilever beam side span cast-in-place sections with large ground clearance, complex geological conditions and severe climatic environment.

Description

Construction Method of Superelevation Composite Support in Cast-in-place Section of Side Span of Bridge

technical field

The invention relates to the field of bridge construction, in particular to a method for constructing a T-shaped steel structure of a bridge or a side-span cast-in-place section of a cantilever beam by using a superhigh bracket for construction.

Background technique

With the densification of road and railway networks, the application of T-shaped rigid structures and cantilever beams in bridge engineering has become very common. T-shaped rigid structures and cantilever beam side-span cast-in-place supports are mostly used as floor supports, and floor supports are divided into Mantang Brackets and post-and-beam brackets. The full hall support is generally suitable for the construction of the cast-in-place box girder with a small height from the ground, and the beam-column support is generally used for the cast-in-place construction of the cast-in-place box girder with a large height from the ground. Beam-column support, also known as less support, has low stability. When bridge construction will encounter complex geological conditions and harsh climate conditions, such as in Northwest my country, Xinjiang and other places, there are many and sudden monsoons, and the instantaneous wind force can reach 12 Above the level, the use of beam-column support for the cast-in-place section with a large or super high height from the ground obviously cannot meet the safety requirements.

Contents of the invention

The object of the present invention is to provide a high stability and high safety construction method for super-high supports, which can meet the construction requirements for the cast-in-place bridge section with a large height from the ground.

In order to realize the purpose of the present invention, at first a kind of ultra-high combined bracket is provided, and its technical scheme is as follows:

A bridge side-span cast-in-place super-high combined support, characterized in that: the combined support includes a beam-column support, and two cantilever brackets fixed on the bridge transition pier body, wherein,

The beam-column support includes four equal-height columns at the four apex positions of the rectangle in the horizontal direction, which are respectively the first column, the second column, the third column and the fourth column, and each column is perpendicular to the ground and Its lower end is fixed on the ground, and the upper end of each column is fixed with a column steel sand barrel; between the first column and the second column and the third column, and between the fourth column and the second column and the third column, The connection between the first column and the fourth column, and between the second column and the third column is welded by a diagonal brace; the first column and the third column of the beam-column support Columns are fixedly connected to the bridge transition pier body through horizontal connecting rods;

The two cantilever brackets are fixed on the body of the transition pier of the bridge at the same height. Each cantilever bracket includes a corbel and a tripod. The cap is fixed on the body of the transition pier, a distribution beam is erected on the corbels of the two brackets, and bracket steel sand barrels are respectively arranged on the distribution beam facing the two corbels; the tripod includes a horizontal bar, a A longitudinal bar perpendicular to the cross bar, and a diagonal bar connecting the longitudinal bar and the cross bar. The longitudinal bar is fixed on the transition pier with pressure beams and nuts using the finish-rolled rebar embedded in the pier body of the transition pier. On the pier body, the lower end of the longitudinal bar is supported on the bracket steel sand barrel, the upper end of the longitudinal bar is welded to one end of the horizontal bar, and the oblique bar is welded to the lower end of the longitudinal bar and the horizontal bar ; Between the diagonal bar and the longitudinal bar, between the diagonal bar and the horizontal bar, and between the connecting ends of the diagonal bar and the longitudinal bar and the horizontal bar of the tripod, the support rods are welded and connected;

The top surface of the crossbar of the tripod of the two cantilever brackets is flush with the top surface of the column steel sand barrel on the column, and the crossbar of one of the tripods is close to the first column and the second column, and Parallel to the straight line where the first column and the second column are located; the cross bar of another tripod is close to the third column and the fourth column, and is parallel to the straight line where the third column and the fourth column are located;

The combined support also includes three load-bearing beams, wherein the first load-bearing beam spans the column steel sand barrel on the second column and the fourth column and the crossbar of the two tripods, and the second load-bearing beam spans the first column and the column steel sand barrel on the third column and the cross bars of the two tripods, the third load-bearing beam spans above the connecting ends of the cross bars and longitudinal bars of the two tripods; The load beams are vertical to the stringers.

Further, the above combined bracket may also include the following features:

The first column and the third column of the beam-column support are respectively fixedly connected to the bridge transition pier body through transverse connecting rods;

Between the oblique bar and the longitudinal bar, between the oblique bar and the horizontal bar, and between the oblique bar and the connecting ends of the longitudinal bar and the horizontal bar of the tripod are connected by welding of support rods;

The length of the tripod cross bar is greater than or equal to the distance from the second column and the fourth column to the bridge transition pier body.

The present invention also provides a construction method for the super-elevation composite support of the cast-in-place section of the side span of the bridge, which is characterized in that:

(1) Sections 1 to n-1 of the installation of beam-column brackets: on the basis of the expansion of the pier body cap of the bridge transition pier, install four columns at the four apex positions of the rectangle in the horizontal direction, respectively for the first The column, the second column, the third column and the fourth column, each column is composed of n standard joints, the value of n is determined according to the predetermined height of the combined bracket, and n≥2; the standard section of each column They are connected by flanges; each column is perpendicular to the horizontal plane and its lower end is fixed on the expanded foundation of the pier cap of the bridge transition pier; between the first column, the second column and the third column, and the fourth column The connection between the second column and the third column is welded by a horizontal connecting rod, and the connection between the first column and the fourth column, and between the second column and the third column is welded by a diagonal brace;

(2) Install two cantilever brackets: on the transition pier of the bridge, fix and install two equal-height corbels with the pre-buried precision-rolled rebar in the transition pier body, and erect a distribution beam on the two corbels. Bracket steel sand barrels are respectively installed on the distribution beam opposite to the two corbels, and a tripod is respectively installed on the two bracket steel sand barrels; Rod, a diagonal bar connecting the longitudinal bar and the cross bar; the longitudinal bar is fixed on the transition pier body with pressure beams and nuts by using the finished rolled rebar embedded in the transition pier body, the longitudinal bar The lower end is supported on the bracket steel sand barrel, the upper end of the longitudinal bar is welded to one end of the horizontal bar, and the oblique bar is welded to the lower end of the longitudinal bar and the other end of the horizontal bar; the top surface of the horizontal bar It is flush with the predetermined height of the combination bracket, and the crossbar of one tripod is close to the first and second uprights and parallel to the line where the first and second uprights are located; the crossbar of the other tripod is close to the first and second uprights. Describe the third column and the fourth column, and be parallel to the straight line where the third column and the fourth column are located;

(3) Install the nth section of the beam-column bracket: install the nth standard section of each column, and install the column steel sand barrel on the top; the top surface of the column steel sand barrel and the top of the cross bar of the bracket tripod face flush;

(4) Install load-bearing beams and longitudinal beams: the first load-bearing beam spans the column steel sand barrels on the second and fourth columns and the crossbars of the two tripods, and the second load-bearing beam spans the first and fourth columns. On the column steel sand barrel on the three columns and the cross bars of the two tripods, the third load-bearing beam spans above the connecting ends of the cross bars and the longitudinal bars of the two tripods; stringer;

(5) Perform jack steel strand reaction force preloading on the combined support, and adjust the pre-camber of the support;

(6) Install the cast-in-place section formwork on the combined support, and carry out the pouring concrete construction of the cast-in-place section and the construction of the side-span closing section.

The invention organically combines the floor support and the bracket. Compared with the single beam-column support, the present invention has a strong bearing capacity, a large use height range, low requirements on topographic and geological conditions, and a small amount of foundation treatment; The invention has the advantages of small weight, low construction loss, small non-elastic deformation, can greatly reduce material input, low construction cost, high reuse rate, and good technical and economic indicators.

The combined bracket adopted in the present invention has strong system structure versatility, simple and quick assembly, small inelastic deformation, reliable connection quality, and high construction safety, and is suitable for T-shaped structures with high ground clearance, complex geological conditions, and harsh climate environments. Rigid frame and cantilever girder side span cast-in-place sections are also widely used in cast-in-place constructions such as cast-in-place box girders with high piers, cast-in-place box girders in soft soil areas, and main tower beams of cable-stayed bridges.

Description of drawings

Fig. 1 is a schematic plan view of the column layout of the beam-column support of the present invention

Fig. 2 is the front view of beam column type support of the present invention

Fig. 3 is the side view of beam-column type support of the present invention

Fig. 4 is a schematic view of the structure of the cantilever bracket of the present invention

Fig. 5 is the front view of the present invention

Fig. 6 is a side view structural representation of the present invention

Fig. 7 is a top view structural representation of the present invention

Figure 8 is a structural schematic diagram of the steel sand drum

Fig. 9 is a flow chart of the construction method of the super-elevation composite support for the cast-in-place section of the side bridge span of the present invention

Detailed ways

The present invention is a bridge side-span cast-in-place section ultra-high composite support, comprising a beam-column support 1, and two cantilever brackets 3 fixed on the bridge transition pier body 2;

As shown in Fig. 1, Fig. 2 and Fig. 3, the beam-column support 1 includes four equal-height columns at the four apex positions of the rectangle in the horizontal direction, which are respectively the first column 11, the second column 12, The third column 13 and the fourth column 14, each column is perpendicular to the ground and its lower end is fixed on the ground, usually fixed on the expanded foundation of the bridge transition pier cap. The upper end of each column is fixedly provided with a column steel sand cylinder 4, and the steel sand cylinder is generally welded and fixed with the upper end of the column; between the first column 11 and the second column 12 and the third column 13, and between the fourth column 14 and the first column Between the two uprights 12 and the third upright 13, through the welding connection of the transverse connecting rod 101, between the first upright 11 and the fourth upright 14, and between the second upright 12 and the third upright 13, through the diagonal bracing 102 solder connections.

The present invention also includes two cantilever brackets 3 fixed on the pier body 2 of the bridge transition pier. FIG. 4 shows a side view of one of the cantilever brackets 3, and the other side view is the same. The two cantilever brackets 3 are fixed on the bridge transition pier body 2 at the same height, and each cantilever bracket 3 includes a corbel 31 and a tripod 32 . There are a plurality of pre-embedded finish-rolled rebars 33 in the pier body 2 of the bridge transition pier, and the ends of the finish-rolled rebars 33 are exposed from the pier body, which is convenient for connecting with other parts. The corbel 31 is fixed on the transition pier body 2 with a nut 34 using the finish-rolled rebar 33 pre-buried in the transition pier body. A distribution beam 35 is erected on the corbels 31 of the two brackets, and the distribution beam 35 is facing the positions of the two corbels, and bracket steel sand barrels 36 are respectively arranged. The tripod 32 includes a horizontal bar 322 , a longitudinal bar 321 perpendicular to the bar, and an oblique bar 323 connecting the longitudinal bar 321 and the bar 322 . The longitudinal rod 321 is fixed on the transition pier body 2 with a pressure beam 37 and a nut using the finish-rolled threaded steel pre-buried in the transition pier body, and the lower end of the longitudinal rod 321 is supported on the bracket steel sand cylinder 36 Above, the upper end of the vertical bar 321 is welded to one end of the horizontal bar 322 , and the oblique bar 323 is welded to the lower end of the longitudinal bar 321 and the horizontal bar 322 . The connecting part of the oblique bar and the cross bar may be the other end of the cross bar, or a position close to the other end on the cross bar.

As shown in Fig. 5, Fig. 6, Fig. 7, the top surface of the cross bar 322 of the tripod 32 of the two cantilever brackets 3 of the present invention is flush with the top surface of the column steel sand barrel 4 on each column, one of them The crossbar 322 of the tripod is close to the first column 11 and the second column 12, and is parallel to the straight line where the first column 11 and the second column 12 are; the crossbar 322 of the other tripod is close to the third column 13 and the fourth column 14, and parallel to the straight line where the third column 13 and the fourth column 14 are located.

The present invention also includes three load-bearing beams, wherein the first load-bearing beam 51 is straddled on the column steel sand barrel 4 on the second column 12 and the fourth column 14 and on the crossbar 322 of the two tripods, and the second load-bearing beam 52 spans On the steel sand cylinder 4 on the first column 11 and the 3rd column 13 and the crossbar 322 of two tripods, the third load-bearing beam 53 spans the connecting ends of the crossbar 322 and the longitudinal bar 321 of the two bracket tripods. Above: on the load-bearing beams, a plurality of longitudinal beams 6 perpendicular to the load-bearing beams are arranged. The number of longitudinal beams 6 is generally more than 10.

As shown in Figure 6, in order to increase the structural stability of the present invention, the first column 11 and the third column 13 of the beam-column support 1 of the present invention can be fixedly connected to the pier body 2 of the bridge transition pier through a transverse connecting rod 101 respectively . The transverse connecting rod 101 can be fixed to the bridge transition pier body 2 by welding the pre-set finish-rolled rebar in the bridge transition pier body 2 .

The present invention is convenient for transportation, installation and disassembly, and each column constituting the beam-column support 1 is composed of at least two standard joints, and the standard joints are connected by flanges 7 . When the support needs to reach a higher height, the columns can be connected by multiple standard joints. Therefore, through this structure, the height of the present invention can be flexibly adjusted to meet the construction requirements of relatively high or super high cast-in-place sections.

As shown in Fig. 4, between the oblique bar 323 of the tripod 32 of the present invention and the longitudinal bar 321, between the oblique bar 323 and the cross bar 322, and between the oblique bar 323 and the welding connection ends of the longitudinal bar and the cross bar , the support rod 324 can be used for welding connection to enhance the stability and compressive capacity of the tripod 32 .

The present invention is provided with bracket steel sand cylinder 36 below the longitudinal bar of the tripod of cantilever bracket, and is provided with column steel sand cylinder 4 at the upper end of each column, is convenient to pouring formwork unloading.

The steel sand drum is a piston-type sleeve structure, as shown in Figure 8, it is a steel sand drum structure schematic diagram taking the structure of the column steel sand drum 4 as an example, including an upper steel drum 41 and a lower steel drum 42, the upper steel drum The bottom 411 of the cylinder 41 and the bottom 421 of the lower steel cylinder 42 are all sealed, the lower steel cylinder 42 is filled with sand 43, the bottom 411 of the upper steel cylinder 41 is located in the lower steel cylinder 42 and supported on the sand 43 in the lower steel cylinder , there is a certain distance between the bottom 411 of the upper steel cylinder and the bottom 421 of the lower steel cylinder, the gap between the outer wall of the upper steel cylinder 41 and the inner wall of the lower steel cylinder 42 is sealed with asphalt or concrete, and the top of the upper steel cylinder is provided with a top plate 412, A sand leaking port 422 is provided below the side wall of the lower steel cylinder 42 , and a valve 423 is provided at the sand leaking port 422 . Open the valve 423 of the sand leakage port 422, the sand in the lower steel cylinder 42 flows out, and the upper steel cylinder 41 descends under the action of dead weight and load pressure, so the height of the steel sand cylinder can be reduced by putting sand through the lower steel cylinder. The structure of bracket steel sand box 36 is identical with above-mentioned column steel sand box 4 structures. During the pouring construction of the present invention, the upper part of the combined support carries the formwork. After the pouring construction of the cast-in-place section is completed, the sand leakage valves on the bracket steel sand barrel 36 and the column steel sand barrel 4 are opened, and the sand in the steel sand barrel flows out. , the height of the steel sand barrel is reduced, and the height of the upper part of the combined support is lowered, which is convenient for the unloading of the formwork on the upper part of the combined support.

Fig. 9 is a flow chart of the construction method of the super-elevation composite bracket spanning the cast-in-situ section of the side bridge of the present invention, and the specific process is as follows:

(1) Sections 1 to n-1 of the installation of beam-column brackets: on the basis of the expansion of the pier body cap of the bridge transition pier, install four columns at the four apex positions of the rectangle in the horizontal direction, respectively for the first The column, the second column, the third column and the fourth column, each column is composed of n standard joints, the value of n is determined according to the predetermined height of the combined bracket, and n≥2; the standard section of each column They are connected by flanges; each column is perpendicular to the horizontal plane and its lower end is fixed on the expanded foundation of the pier cap of the bridge transition pier; between the first column, the second column and the third column, and the fourth column The connection between the second column and the third column is welded by a horizontal connecting rod, and the connection between the first column and the fourth column, and between the second column and the third column is welded by a diagonal brace;

(2) Install two cantilever brackets: on the transition pier of the bridge, fix and install two equal-height corbels with the pre-buried precision-rolled rebar in the transition pier body, and erect a distribution beam on the two corbels. Bracket steel sand barrels are respectively installed on the distribution beam opposite to the two corbels, and a tripod is respectively installed on the two bracket steel sand barrels; Rod, a diagonal bar connecting the longitudinal bar and the cross bar; the longitudinal bar is fixed on the transition pier body with pressure beams and nuts by using the finished rolled rebar embedded in the transition pier body, the longitudinal bar The lower end is supported on the bracket steel sand barrel, the upper end of the longitudinal bar is welded to one end of the horizontal bar, and the oblique bar is welded to the lower end of the longitudinal bar and the other end of the horizontal bar; the top surface of the horizontal bar It is flush with the predetermined height of the combination bracket, and the crossbar of one tripod is close to the first and second uprights and parallel to the line where the first and second uprights are located; the crossbar of the other tripod is close to the first and second uprights. Describe the third column and the fourth column, and be parallel to the straight line where the third column and the fourth column are located;

(3) Install the nth section of the beam-column bracket: install the nth standard section of each column, and install the column steel sand barrel on the top; the top surface of the column steel sand barrel and the top of the cross bar of the bracket tripod face flush;

(4) Install load-bearing beams and longitudinal beams: the first load-bearing beam spans the column steel sand barrels on the second and fourth columns and the crossbars of the two tripods, and the second load-bearing beam spans the first and fourth columns. On the column steel sand barrel on the three columns and the cross bars of the two tripods, the third load-bearing beam spans above the connecting ends of the cross bars and the longitudinal bars of the two tripods; stringer;

(5) Perform jack steel strand reaction force preloading on the combined support, and adjust the pre-camber of the support;

(6) Install the cast-in-place section formwork on the combined support, and carry out the pouring concrete construction of the cast-in-place section and the construction of the side-span closing section.

Further, the above method may also include the following steps:

(7) After the pouring concrete construction of the cast-in-place section and the construction of the side-span closure section are completed, sand is released into the column steel sand barrel and the bracket steel sand barrel, and the height of the combined support is lowered to facilitate the removal of the cast-in-place section formwork and combined support.

When the above method is implemented in practice, the first column and the third column of the beam-column support can be fixedly connected to the bridge transition pier body through transverse connecting rods respectively.

During the specific implementation of the above method, the support rods can be welded and connected between the diagonal rods and the longitudinal rods, between the diagonal rods and the horizontal rods, and between the diagonal rods and the connecting ends of the vertical rods and the horizontal rods of the tripod.

In the above method, the length of the tripod crossbar should be greater than or equal to the distance from the second column and the fourth column to the bridge transition pier body.

Claims (8)

1. a bridge end bay Cast-in-Situ Segment superelevation sectional shelf-unit, is characterized in that: described sectional shelf-unit comprises a beam-column type bracket, and two cantilever brackets that are fixed on bridge transition pier pier shaft, wherein,

Described beam-column type bracket comprises four contour columns of four vertex positions of the rectangle that is positioned at horizontal direction, be respectively the first column, the second column, the 3rd column and the 4th column, every described column is connected to form by least 2 standard knots, between standard knot, by flange, connects; Every root post fixes on the ground perpendicular to Qie Qi lower end, ground, and the upper end of every root post is provided with the husky cylinder of column steel; Between described the first column and the second column and the 3rd column, and the 4th between column and the second column and the 3rd column, by tranverse connecting rod, be welded to connect, between described the first column and the 4th column, and second between column and the 3rd column, by hound, be welded to connect; The first column of described beam-column type bracket and the 3rd column, be fixedly connected with bridge transition pier pier shaft by tranverse connecting rod respectively;

Described two cantilever brackets are contour to be fixed on bridge transition pier pier shaft, each cantilever bracket comprises a bracket, a tripod, described bracket utilization is embedded in the fining twisted steel in transition pier pier shaft, with nut, be fixed on transition pier pier shaft, one distribution beam is erected on the bracket of two brackets, is respectively arranged with the husky cylinder of bracket steel in distribution beam over against two bracket positions; Described tripod comprises that a horizontally disposed cross bar, a vertical pole, vertical with described cross bar are connected the brace of described vertical pole and cross bar, described vertical pole utilization is embedded in the fining twisted steel in transition pier pier shaft, with pressing beam and nut to be fixed on transition pier pier shaft, the lower end of vertical pole is supported on the husky cylinder of described bracket steel, the upper end of vertical pole and one end of described cross bar welding, the lower end of described brace and described vertical pole and described cross bar are welded to connect; Between the brace and vertical pole of described tripod, between brace and cross bar, and between brace and vertical pole and the link of cross bar, adopt support bar to be welded to connect;

The end face of the cross bar of the tripod of described two cantilever brackets flushes with the end face of the husky cylinder of column steel on described column, and the cross bar of one of them tripod is near described the first column and the second column, and with the straight line parallel at the first column and the second column place; The cross bar of another tripod is near described the 3rd column and the 4th column, and with the straight line parallel at described the 3rd column and the 4th column place;

Described sectional shelf-unit also comprises three spandrel girders, wherein on the cross bar of the first spandrel girder across the husky cylinder of the column steel on the second column and the 4th column and two tripods, on the cross bar of the second spandrel girder across the husky cylinder of the column steel on the first column and the 3rd column and two tripods, the 3rd spandrel girder is across above the cross bar at two tripods and vertical pole link; On described spandrel girder, be provided with the many longerons vertical with described spandrel girder.

2. sectional shelf-unit according to claim 1, it is characterized in that: the husky cylinder of described column steel and the husky cylinder of bracket steel include steel cylinder and lower steel cylinder, the bottom of upper steel cylinder and lower steel cylinder bottom seal with Plate Welding, in lower steel cylinder, sand is housed, upper steel cylinder bottom is positioned at lower steel cylinder and is supported on the sand of lower steel cylinder, between upper steel cylinder bottom and doffing bottom, there is certain distance, gap between upper steel cylinder outer wall and lower steel cylinder inwall adopts pitch or concrete sealing, upper steel cylinder top is provided with top board, the sidewall below of lower steel cylinder is provided with Lou husky mouthful, leak husky mouth and be provided with valve.

3. sectional shelf-unit according to claim 1, is characterized in that: the length of described tripod cross bar is more than or equal to described the second column and the 4th column to the distance of bridge transition pier pier shaft.

4. a bridge end bay Cast-in-Situ Segment superelevation sectional shelf-unit construction method, is characterized in that:

(1) the 1st to n-1 of beam-column type bracket being installed saves: on the expansion basis of bridge transition pier pier shaft cushion cap, by four vertex positions that are positioned at the rectangle of horizontal direction, four root posts are installed, be respectively the first column, the second column, the 3rd column and the 4th column, every described column is connected to form by n root standard knot, the value of n is determined according to the predetermined altitude of sectional shelf-unit, and n >=2; Between the standard knot of every root post, by flange, connect; Every root post is fixed on the expansion basis of bridge transition pier pier shaft cushion cap perpendicular to horizontal plane and its lower end; Between described the first column and the second column and the 3rd column, and the 4th between column and the second column and the 3rd column, by tranverse connecting rod, be welded to connect, between described the first column and the 4th column, and second between column and the 3rd column, by hound, be welded to connect;

(2) two cantilever brackets are installed: on bridge transition pier pier shaft, utilization is embedded in two the contour brackets of fining twisted steel fixed installation in transition pier pier shaft, on two brackets, set up a distribution beam, the husky cylinder of bracket steel is set respectively over against two bracket positions in distribution beam, on the husky cylinder of two bracket steel, a tripod is installed respectively; Described tripod comprises that a horizontally disposed cross bar, a vertical pole, vertical with described cross bar are connected the brace of described vertical pole and cross bar; Described vertical pole utilization is embedded in to the fining twisted steel in transition pier pier shaft, with pressing beam and nut to be fixed on transition pier pier shaft, the lower end of vertical pole is supported on the husky cylinder of described bracket steel, the upper end of vertical pole and one end of described cross bar welding, the lower end of brace and described vertical pole and the other end of described cross bar are welded to connect; The end face of cross bar flushes with the predetermined altitude of sectional shelf-unit, and the cross bar of a tripod is near described the first column and the second column, and with the straight line parallel at the first column and the second column place; The cross bar of another tripod is near described the 3rd column and the 4th column, and with the straight line parallel at described the 3rd column and the 4th column place;

(3) the n joint of beam-column type bracket is installed: the n root standard knot of every root post is installed, and the husky cylinder of column steel is installed at its top; The end face of the husky cylinder of column steel flushes with the cross bar end face of bracket tripod;

(4) spandrel girder and longeron are installed: wherein on the cross bar of the first spandrel girder across the husky cylinder of the column steel on the second column and the 4th column and two tripods, on the cross bar of the second spandrel girder across the husky cylinder of the column steel on the first column and the 3rd column and two tripods, the 3rd spandrel girder is across above the cross bar at two tripods and vertical pole link; On spandrel girder, the longeron vertical with described spandrel girder is set;

(5) sectional shelf-unit is carried out to the precompressed of lifting jack steel twisted wire counter-force, adjusting pole camber;

(6) Cast-in-Situ Segment template is installed on sectional shelf-unit, carries out Cast-in-Situ Segment concrete construction and end bay closure section construction.

5. method according to claim 4, is characterized in that, described method further comprises:

(7), after Cast-in-Situ Segment concrete construction and end bay closure section construction complete, the husky cylinder of column steel and the husky cylinder of bracket steel are put sand, reduce sectional shelf-unit height, to remove Cast-in-Situ Segment template and sectional shelf-unit.

6. according to the method described in claim 4 or 5, it is characterized in that: the first column of described beam-column type bracket and the 3rd column, be fixedly connected with bridge transition pier pier shaft by tranverse connecting rod respectively.

7. according to the method described in claim 4 or 5, it is characterized in that: between the brace and vertical pole of described tripod, between brace and cross bar, and between brace and vertical pole and the link of cross bar, adopt support bar to be welded to connect.

8. according to the method described in claim 4 or 5, it is characterized in that: the length of described tripod cross bar is more than or equal to described the second column and the 4th column to the distance of bridge transition pier pier shaft.

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