CN119736843A - Small radius, large cross slope, super-high cast-in-place box girder and construction method in interchange area - Google Patents

Abstract

The present invention relates to a super-high cast-in-place box girder with a small radius and a large transverse slope in an interchange area and a construction method, step one, support and steel beam installation: set up a support at the lower part of the cast-in-place box girder and install the steel beam; step two, box girder bracket installation on the steel beam: first build a bracket upright and a bracket crossbar, install a limit plate and an adjustable top support at the upper end of the bracket upright, and install the bottom mold support beam on the top of the bracket upright; step three, box girder template installation: place the bottom steel outer mold on the bottom mold support beam; step four, steel reinforced bracket installation; step five, bracket pre-compression: steel reinforced bracket and box girder bracket are pre-compressed by water bag partitions; step six, box girder construction. The present invention belongs to the field of civil engineering, and is aimed at the construction method of super-high cast-in-place box girder with a small radius and a large transverse slope in an interchange area, which effectively reduces engineering costs, speeds up construction speed, and can achieve good technical and economic benefits when applied to actual projects.

Description

Intercommunicating area small-radius large-transverse slope ultrahigh cast-in-situ box girder and construction method

Technical Field

The invention relates to a construction method of an intercommunicating area small-radius large-transverse-slope ultrahigh cast-in-situ box girder, which belongs to the field of civil engineering and is suitable for construction of the intercommunicating area small-radius large-transverse-slope ultrahigh cast-in-situ box girder.

Background

With the continuous development of urban construction in China, a large number of bridges are required to be constructed. In view of the cost and structural stability of the bridge, prestressed concrete bridges are mostly used in bridge construction. The development trend of bridge construction can be seen to develop in the current trend of larger and longer bridge construction, and meanwhile, the aesthetic and environmental protection of the bridge are also more emphasized. Therefore, the super-long pre-stressing construction process of the cast-in-situ box girder bridge can be widely applied to bridge construction in China.

However, the conventional construction of the cast-in-situ box girder with small radius and large transverse slope has the defects of difficult installation and positioning of the template bracket and the box girder inner mold, low construction efficiency and the like.

Disclosure of Invention

The invention aims to provide the small-radius large-transverse-slope ultrahigh cast-in-situ box girder in the intercommunicating area and the construction method thereof, aiming at the problem of construction of the small-radius large-transverse-slope ultrahigh cast-in-situ box girder in the intercommunicating area, and meeting the requirements of structural construction.

In order to achieve the technical aim, the invention adopts the following technical scheme that the construction method of the intercommunicating area small-radius large-transverse slope ultrahigh cast-in-situ box girder comprises the following specific steps:

step one, supporting and installing a section steel beam, namely erecting a support and installing the section steel beam at the lower part of a cast-in-situ box girder;

Step two, box girder bracket installation is carried out on the section steel cross beam, namely, a bracket vertical rod and a bracket cross rod are firstly built, a limiting plate and an adjustable jacking are installed at the upper end of the bracket vertical rod, and a bottom die supporting cross beam is installed at the top of the bracket vertical rod;

Step three, installing a box girder template, wherein an outer mold of the box girder adopts a bottom-covered steel outer mold, and an inner mold of the box girder adopts an adjustable integral inner mold, and the bottom-covered steel outer mold is placed on a bottom mold supporting beam;

The fourth step, installing the steel reinforced support, namely installing the steel reinforced support comprising a steel support middle beam, a steel support upright post and a steel support top beam, installing the steel support top beam at the lower side of a box girder outer side template of the bottom-wrapping steel outer mold, supporting the Bao Dexing steel outer mold through the steel support upright post, installing the steel support top beam on the steel support upright post, and enabling one end of the steel support top beam to prop against the side surface of the bottom template of the bottom-wrapping steel outer mold;

step five, prepressing the support, namely prepressing the section steel reinforced support and the box girder support by adopting water bag partition;

And step six, box girder construction, namely binding and concreting the box girder steel bars on the bottom-covered steel outer mold.

In the second step, a section steel buttress is arranged below the bottom die supporting beam, a jack is arranged on the section steel buttress, the upper end of the jack props against the bottom die supporting beam, and the bottom die supporting beam is adjusted through the jack.

In the step three, the inner mold main body comprises an inner mold top mold and an inner mold bottom mold, a plurality of adjustable side mold plates are arranged between two ends of the inner mold top mold and the inner mold bottom mold, the adjacent adjustable side mold plates, the adjustable side mold plates and the inner mold top mold and the adjustable side mold plates and the inner mold bottom mold are all hinged through adjusting hinge shafts, and an adjustable vertical rod and an adjustable cross rod are arranged in the inner mold main body and internally support the inner mold main body through the adjustable vertical rod and the adjustable cross rod.

In the step three, the integral internal mold positioning support comprises a template support beam and a suspender, wherein the template support beam is connected with the internal mold main body through the suspender, an adjusting bolt is connected to the suspender, and the upper end of the suspender is connected with the template support beam through the adjusting bolt.

The construction method of the small-radius large-transverse-slope ultrahigh cast-in-situ box girder in the intercommunicating area is implemented.

The invention has the following characteristics and beneficial effects:

(1) Adopt case roof beam support and shaped steel reinforcing support to carry out big transverse slope superelevation cast-in-situ box the beam template is supported and adjusted, increase the small radius and large transverse slope of the intercommunication area the cast-in-situ box girder template support supports the construction efficiency;

(2) The mounting position of the box girder template is accurately adjusted by adopting an adjustable jacking, a jack and a height adjusting block, so that the mounting and positioning precision of the small-radius large-transverse-slope ultrahigh cast-in-situ box girder template in the intercommunicating area is improved;

(3) And the adjustable integral internal mold and the integral internal mold positioning bracket are adopted for installing the internal mold of the box girder, so that the installation and construction efficiency and the construction quality of the internal mold of the box girder are improved.

Drawings

FIG. 1 is a construction structure diagram of an intercommunicating area small-radius large-transverse slope ultrahigh cast-in-situ box girder;

FIG. 2 is a cast-in-place box girder template a bracket structure diagram;

FIG. 3 is a structural view of a section steel reinforced bracket;

Fig. 4 is a diagram of the adjustable integral internal mold.

In the drawing, a cast-in-situ box girder, 2, a bottom-covered steel outer mold, 3, a steel reinforced bracket, 4, a box girder bracket, 5, a steel beam, 6, a steel buttress, 7, a bottom die supporting beam, 8, a jack, 9, a height adjusting block, 10, a bracket vertical rod, 11, a bracket horizontal rod, 12, a limiting plate, 13, an adjustable jacking, 14, a box girder outer template, 15, a bottom template, 16, a steel bracket middle beam, 17, a steel bracket vertical rod, 18, a steel bracket top beam, 19, an adjustable integral inner mold, 20, an integral inner mold positioning bracket, 21, a template bracket horizontal rod, 22, a hanging rod, 23, an adjusting bolt, 24, an adjustable side template, 25, an adjustable hinge shaft, 26, an inner template bottom die, 27, an adjustable vertical rod, 28, an adjustable horizontal rod and 29, and an inner template top mold are shown.

Detailed Description

The construction technical requirements such as detailed structural treatment in the embodiments of the present invention are not repeated, and the embodiments of the present invention are mainly described, and the present invention is further described in detail by way of examples with reference to the accompanying drawings, and the description is not limited to the following examples.

Fig. 1 is a construction structure diagram of an intercommunicating area small-radius large-transverse slope ultrahigh cast-in-situ box girder 1, fig. 2 is a construction diagram of a cast-in-situ box girder 1 template and a bracket, fig. 3 is a construction diagram of a section steel reinforced bracket 3, and fig. 4 is a construction diagram of an adjustable integral internal mold 19

The construction structure diagram of the intercommunicating area small-radius large-transverse slope ultrahigh cast-in-situ box girder 1 shown in fig. 1 comprises a cast-in-situ box girder 1, a bottom-covered steel outer mold, a section steel reinforcing bracket 3, a box girder bracket 4, a section steel cross beam 5, a section steel buttress 6, a bottom mold supporting cross beam 7, a jack 8 and a height adjusting block 9. For construction of the small-radius large-transverse-slope ultrahigh cast-in-situ box girder in the intercommunicating area, a box girder bracket 4 and a steel reinforcing bracket 3 are arranged on a steel beam 5 to support a bottom-covered steel outer mold 2 and a bottom mold supporting beam 7, a steel buttress 6, a jack 8 and a height adjusting block 9 are arranged on the steel beam 5 to adjust the bottom mold supporting beam 7, and the bottom-covered steel outer mold 2 is used for casting the cast-in-situ box girder 1.

Wherein, the bottom-covered steel outer mold 2 comprises a bottom mold plate 15 and box girder outer mold plates 14 positioned at two sides of the bottom mold plate 15.

As shown in fig. 2, the cast-in-situ box girder template and support structure diagram, the box girder support 4 comprises a support upright rod 10 and a support cross rod 11, wherein a limiting plate 12 and an adjustable jacking 13 are arranged at the upper end of the support upright rod 10 and used for positioning and supporting a box girder outer template 14 and a bottom template 15 and adjusting the installation positions of the box girder outer template 14 and the bottom template 15. Wherein the support uprights 10 are arranged along a vertical direction and the support cross bars 11 are arranged along a horizontal direction. The bottom die supporting cross beam 7 is arranged at the upper end of the bracket upright 10. The bottom template 15 of the Bao Dexing steel outer die 2 is arranged on the bottom die supporting beam 7.

The section steel buttress 6 is arranged below the bottom die supporting beam 7, a jack 8 is arranged on the section steel buttress 6, and the upper end of the jack 8 props against the bottom die supporting beam 7 and is used for adjusting the bottom die supporting beam 7. A height adjusting block 9 is arranged between the jack 8 and the bottom die supporting beam 7.

The structural diagram of the steel reinforced bracket 3 shown in fig. 3 is that the steel reinforced bracket 3 comprises a steel bracket middle beam 16, a steel bracket upright 17 and a steel bracket top beam 18, and the steel reinforced bracket 3 is used for carrying out reinforced support treatment on the bottom-covered steel outer die 2 of the small-radius large-transverse-slope ultrahigh cast-in-situ box girder 1. The section steel support top beam 1 is arranged below the box girder outer side template 14, and the section steel support upright 17 is arranged between the section steel support top beam 1 and the section steel beam 5 and used for reinforcing and supporting the box girder outer side template 14. The middle cross beam 16 of the steel support is arranged in the horizontal direction, the middle cross beam 16 of the steel support is connected with the upright post 17 of the steel support, and one end of the middle cross beam 16 of the steel support props against the side face of the bottom template 15.

As shown in fig. 4, the cast-in-situ box girder 1 adopts an adjustable integral internal mold 19 as an inner pouring template, the adjustable integral internal mold 19 comprises an integral internal mold positioning bracket 20, an internal mold main body, an adjustable vertical rod 27 and an adjustable cross rod 28, the internal mold main body comprises an adjustable side template 24, an adjustable hinge shaft 25, an internal template bottom die 26 and an internal template top die 29, a plurality of adjustable side templates 24 are arranged between two ends of the internal template top die 29 and the internal template bottom die 26, adjacent adjustable side templates 24, adjustable side templates 24 and the internal template top die and adjustable side templates 24 and the internal template bottom die 26 are hinged through the adjustable hinge shaft 25 so as to enable the adjacent two templates to rotate relatively, and the adjustable side templates 24, the internal template bottom die 26 and the internal template top die 29 are connected with each other to form the internal mold main body. An adjustable upright 27 and an adjustable cross bar 28 are arranged inside the inner mould body and are used for supporting the inner mould body. The integral internal mold positioning support 20 is used for hanging an internal mold main body, the integral internal mold positioning support 20 comprises a template support beam 21 and a suspender 22, the template support beam 21 is connected with the internal mold main body through the suspender 22, an adjusting bolt 23 is connected to the suspender 22, and the upper end of the suspender 22 is connected with the template support beam 21 through the adjusting bolt 23.

Small radius large transverse slope superhigh of intercommunication area the construction method of the cast-in-situ box girder comprises the following steps:

Step one, supporting and installing a section steel beam 5, namely erecting a supporting and installing the section steel beam 5 at the lower part of a cast-in-situ box girder 1;

Step two, installing a box girder bracket 4, namely, when installing the box girder bracket 4 on a section steel cross beam 5, firstly building a bracket vertical rod 10 and a bracket cross rod 11, installing a limiting plate 12 and an adjustable jacking 13 at the upper end of the bracket vertical rod 10, and installing a bottom die supporting cross beam 7 at the top of the bracket vertical rod 10;

Step three, installing a box girder template, wherein an outer die of the box girder adopts a bottom-covered steel outer die 2, and an inner die of the box girder adopts an adjustable integral inner die 19, and the bottom-covered steel outer die 2 is placed on a bottom die supporting beam 7, wherein the adjustable integral inner die 19 comprises an inner die main body and an integral inner die positioning bracket 20, and the inner die main body is hoisted into the bottom-covered steel outer die 2 through the integral inner die positioning bracket 20;

The fourth step, the steel reinforced bracket 3 is installed, wherein the steel reinforced bracket 3 comprises a steel bracket middle beam 16, a steel bracket upright post 17 and a steel bracket top beam 18, the steel bracket top beam 18 is installed on the lower side of a box girder outer side template 14 of the bottom-covered steel outer mold 2, the bottom-covered steel outer mold 2 is supported by the steel bracket upright post 17, the steel bracket top beam 18 is installed on the steel bracket upright post 17, one end of the steel bracket top beam 18 props against the side surface of a bottom template 15 of the bottom-covered steel outer mold 2;

step five, prepressing the support, namely prepressing the section steel reinforced support 3 and the box girder support 4 by adopting water bag partitions;

And step six, box girder construction, namely binding and concreting the box girder steel bars on the bottom-covered steel outer die 2.

Claims (5)

1. A construction method for a super-high cast-in-place box girder with a small radius and a large transverse slope in an interchange area, characterized in that it comprises the following specific steps: Step 1: Install support and steel beam (5): Set up support and install steel beam (5) at the bottom of cast-in-place box beam (1); Step 2: Install the box beam support (4) on the steel beam (5): first build the support uprights (10) and the support crossbars (11), install the limit plates (12) and the adjustable top supports (13) on the upper ends of the support uprights (10), and install the bottom mold support crossbar (7) on the top of the support uprights (10); Step 3: box girder formwork installation: the outer formwork of the box girder adopts a bottom steel outer formwork (2), and the inner formwork of the box girder adopts an adjustable integral inner formwork (19), and the bottom steel outer formwork (2) is placed on the bottom formwork support beam (7); the adjustable integral inner formwork (19) comprises an inner formwork body and an integral inner formwork positioning bracket (20), and the inner formwork body is suspended and placed in the bottom steel outer formwork (2) through the integral inner formwork positioning bracket (20); Step 4, installation of the steel reinforcement bracket (3): the steel reinforcement bracket (3) comprises a steel bracket middle crossbeam (16), a steel bracket column (17) and a steel bracket top crossbeam (18), the steel bracket top crossbeam (18) is installed on the lower side of the box beam outer template (14) of the bottom steel outer template (2), the bottom steel outer template (2) is supported by the steel bracket column (17), the steel bracket top crossbeam (18) is installed on the steel bracket column (17), and one end of the steel bracket top crossbeam (18) is supported against the side of the bottom template (15) of the bottom steel outer template (2); Step 5: Pre-pressing the support: The steel reinforced support (3) and the box beam support (4) are pre-pressed by using water bags in different areas; Step 6: Box girder construction: Binding of box girder reinforcement and pouring of concrete are carried out on the bottom steel outer formwork (2). 2. The construction method of the small-radius, large-slope, and super-high cast-in-place box girder in the interchange area according to claim 1 is characterized in that, in step 2, a steel pier (6) is arranged below the bottom mold support beam (7), and a jack (8) is installed on the steel pier (6), and the upper end of the jack (8) supports the bottom mold support beam (7); the bottom mold support beam (7) is adjusted by the jack (8). 3. The construction method of the small-radius, large-cross-slope, super-high cast-in-place box girder in the interchange area according to claim 1 is characterized in that, in step three, the inner mold body includes an inner mold top mold (29) and an inner mold bottom mold (26), and a plurality of adjustable side molds (24) are provided between the two ends of the inner mold top mold (29) and the inner mold bottom mold (26). Adjacent adjustable side molds (24), between the adjustable side molds (24) and the inner mold top mold, and between the adjustable side molds (24) and the inner mold bottom mold (26) are all hinged by adjusting hinge shafts (25), and the interior of the inner mold body is provided with adjustable vertical rods (27) and adjustable cross rods (28), and the inner mold body is internally supported by the adjustable vertical rods (27) and adjustable cross rods (28). 4. The construction method of the small-radius, large-slope, and super-high cast-in-place box girder in the interchange area according to claim 1 is characterized in that, in step three, the integral inner mold positioning bracket (20) includes a template bracket crossbeam (21) and a hanger (22), the template bracket crossbeam (21) is connected to the inner mold body through the hanger (22), and an adjusting bolt (23) is connected to the hanger (22), and the upper end of the hanger (22) is connected to the template bracket crossbeam (21) through the adjusting bolt (23). 5. A super-elevated cast-in-place box girder with a small radius and a large transverse slope in an interchange area, characterized in that it is constructed by the construction method of the super-elevated cast-in-place box girder with a small radius and a large transverse slope in an interchange area according to any one of claims 1 to 4.