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

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

Technical Field

[0001] The invention relates to 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, belongs to the field of civil engineering, and is suitable for the construction of a super-high cast-in-place box girder with a small radius and a large transverse slope in an interchange area. Background Art

[0002] With the continuous development of urban construction in my country, a large number of bridges need to be built. Considering the cost and structural stability of bridges, prestressed concrete bridges are mostly used in bridge construction. Looking at the development trend of bridge construction, we can see that the current bridge construction is developing in the direction of larger and longer bridges, while also paying more attention to bridge aesthetics and environmental protection. Therefore, the super-long prestressed construction technology of cast-in-place box girder bridges will be more and more widely used in bridge construction in my country.

[0003] However, the conventional small-radius and large-slope cast-in-place box girder construction has the disadvantages of difficult installation and positioning of formwork supports and box girder inner formwork and low construction efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a super-elevated cast-in-place box girder with a small radius and a large transverse slope in an interchange area and a construction method to meet the needs of structural construction.

[0005] In order to achieve the above technical purpose, the present invention adopts the following technical scheme: a construction method of a super-high cast-in-place box girder with a small radius and a large transverse slope in an interchange area, comprising the following specific steps:

[0006] Step 1: Support and steel beam installation: Set up support and install steel beam at the bottom of cast-in-place box beam;

[0007] Step 2: Install the box beam support on the steel beam: first build the support pole and support crossbar, install the limit plate and adjustable top support on the upper end of the support pole, and install the bottom mold support crossbeam on the top of the support pole;

[0008] Step 3: Box girder formwork installation: The outer formwork of the box girder adopts the outer formwork of the bottom steel, and the inner formwork of the box girder adopts the adjustable integral inner formwork. The outer formwork of the bottom steel is placed on the bottom formwork support beam; the adjustable integral inner formwork includes an inner formwork body and an integral inner formwork positioning bracket, and the inner formwork body is suspended and placed in the outer formwork of the bottom steel through the integral inner formwork positioning bracket;

[0009] Step 4: Installation of the steel reinforcement bracket: The steel reinforcement bracket includes a steel bracket middle beam, a steel bracket column and a steel bracket top beam. The steel bracket top beam is installed on the lower side of the outer template of the box beam of the bottom steel outer mold. The bottom steel outer mold is supported by the steel bracket column. The steel bracket top beam is installed on the steel bracket column. One end of the steel bracket top beam supports the side of the bottom template of the bottom steel outer mold.

[0010] Step 5: Pre-compression of support: The steel reinforced support and box beam support are pre-compressed by water bags in different areas;

[0011] Step 6. Box girder construction: Bind the box girder reinforcement and pour the concrete on the bottom steel outer formwork.

[0012] Preferably, in step 2, a steel pier is provided below the bottom mold supporting beam, a jack is installed on the steel pier, and the upper end of the jack supports the bottom mold supporting beam; the bottom mold supporting beam is adjusted by the jack.

[0013] Preferably, in step three, the inner mold body includes an inner mold top mold and an inner mold bottom mold, a plurality of adjustable side molds are provided between the two ends of the inner mold top mold and the inner mold bottom mold, adjacent adjustable side molds, the adjustable side molds and the inner mold top mold, and the adjustable side molds and the inner mold bottom mold are hinged by adjusting hinges, and adjustable vertical poles and adjustable cross bars are provided inside the inner mold body, and the inner mold body is internally supported by the adjustable vertical poles and adjustable cross bars.

[0014] Preferably, in step three, the integral inner mold positioning bracket includes a template support beam and a hanger, the template support beam is connected to the inner mold body through the hanger, the hanger is connected with an adjustment bolt, and the upper end of the hanger is connected to the template support beam through the adjustment bolt.

[0015] The invention discloses a super-elevated cast-in-place box girder with a small radius and a large transverse slope in an interchange area, and is obtained by a construction method of a super-elevated cast-in-place box girder with a small radius and a large transverse slope in an interchange area.

[0016] The present invention has the following characteristics and beneficial effects:

[0017] (1) Use box beam supports and steel reinforced supports to adjust the formwork support of large-slope super-high cast-in-place box beams, and improve the construction efficiency of the formwork support support of small-radius large-slope super-high cast-in-place box beams in the interchange area;

[0018] (2) Use adjustable jacks, jacks and height adjustment blocks to accurately adjust the installation position of the box girder template to improve the installation positioning accuracy of the small radius, large cross slope and super-high cast-in-place box girder template in the interchange area;

[0019] (3) An adjustable integral inner mold and an integral inner mold positioning bracket are used to install the box girder inner mold, thereby improving the installation efficiency and construction quality of the box girder inner mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the construction structure diagram of the small radius, large cross slope and super-high cast-in-place box girder in the interchange area;

[0021] Figure 2 It is the cast-in-place box girder formwork and support structure diagram;

[0022] Figure 3 This is the structural diagram of the steel reinforced support;

[0023] Figure 4 This is an adjustable overall inner mold structure diagram.

[0024] In the figure, 1 is a cast-in-place box girder; 2 is a bottom steel outer formwork; 3 is a steel reinforcement bracket; 4 is a box girder bracket; 5 is a steel beam; 6 is a steel pier; 7 is a bottom formwork supporting beam; 8 is a jack; 9 is a height adjustment block; 10 is a bracket upright; 11 is a bracket crossbar; 12 is a limit plate; 13 is an adjustable top support; 14 is a box girder outer formwork; 15 is a bottom formwork; 16 is a steel bracket middle beam; 17 is a steel bracket column; 18 is a steel bracket top beam; 19 is an adjustable integral inner formwork; 20 is an integral inner formwork positioning bracket; 21 is a template bracket crossbeam; 22 is a hanger; 23 is an adjustment bolt; 24 is an adjustable side template; 25 is an adjustment hinge; 26 is an inner template bottom template; 27 is an adjustable upright; 28 is an adjustable crossbar; 29 is an inner template top template. DETAILED DESCRIPTION

[0025] The construction technical requirements such as detailed structure processing in the implementation mode of the present invention will not be repeated here, and the implementation mode of the present invention will be explained in detail below with reference to the accompanying drawings and examples. The description is not limited to the following examples.

[0026] Figure 1 This is the construction structure diagram of the small radius, large cross slope and super-high cast-in-place box girder 1 in the interchange area. Figure 2 This is the cast-in-place box girder 1 template and support structure diagram. Figure 3 This is the structural diagram of the steel reinforced bracket 3. Figure 4 It is an adjustable integral inner mold 19 structure diagram

[0027] like Figure 1 The construction structure diagram of the small radius, large transverse slope and super-high cast-in-place box girder 1 in the interchange area shown includes a cast-in-place box girder 1, a bottom steel outer formwork, a steel reinforcement bracket 3, a box girder bracket 4, a steel cross beam 5, a steel pier 6, a bottom formwork support beam 7, a jack 8, and a height adjustment block 9. For the construction of the small radius, large transverse slope and super-high cast-in-place box girder in the interchange area, a box girder bracket 4 and a steel reinforcement bracket 3 are arranged on the steel cross beam 5 to support the bottom steel outer formwork 2 and the bottom formwork support beam 7, a steel pier 6, a jack 8 and a height adjustment block 9 are arranged on the steel cross beam 5 to adjust the bottom formwork support beam 7, and the bottom steel outer formwork 2 is used to cast the cast-in-place box girder 1.

[0028] The bottom steel outer formwork 2 includes a bottom formwork 15 and box beam outer side formworks 14 located on both sides of the bottom formwork 15 .

[0029] like Figure 2In the cast-in-place box beam formwork and support structure diagram shown, the box beam support 4 includes a support upright 10 and a support cross bar 11. A limit plate 12 and an adjustable top support 13 are provided at the upper end of the support upright 10 to position and support the outer formwork 14 and the bottom formwork 15 of the box beam, and to adjust the installation position of the outer formwork 14 and the bottom formwork 15 of the box beam. Among them, the support upright 10 is arranged along the vertical direction, and the support cross bar 11 is arranged along the horizontal direction. The bottom formwork support crossbeam 7 is arranged at the upper end of the support upright 10. The bottom formwork 15 of the bottom steel outer formwork 2 is arranged on the bottom formwork support crossbeam 7.

[0030] The steel pier 6 is arranged below the bottom mold supporting beam 7, and a jack 8 is arranged on the steel pier 6. The upper end of the jack 8 bears against the bottom mold supporting beam 7 for adjusting the bottom mold supporting beam 7. A height adjustment block 9 is arranged between the jack 8 and the bottom mold supporting beam 7.

[0031] like Figure 3 The structural diagram of the steel reinforced support 3 shown in the figure shows that the steel reinforced support 3 includes a steel support middle cross beam 16, a steel support column 17 and a steel support top cross beam 18. The steel reinforced support 3 is used to strengthen the support of the bottom steel outer formwork 2 of the small radius, large cross slope and super-high cast-in-place box girder 1. Among them, the steel support top cross beam 1 is arranged below the outer formwork 14 of the box girder, and the steel support column 17 is arranged between the steel support top cross beam 1 and the steel cross beam 5, which is used to reinforce the support of the outer formwork 14 of the box girder. The steel support middle cross beam 16 is arranged in the horizontal direction, and the steel support middle cross beam 16 is connected to the steel support column 17, and one end of the steel support middle cross beam 16 is against the side of the bottom formwork 15.

[0032] like Figure 4As shown in the structural diagram of the adjustable integral inner formwork, the cast-in-place box girder 1 adopts an adjustable integral inner formwork 19 as the inner casting formwork, and the adjustable integral inner formwork 19 includes an integral inner formwork positioning bracket 20, an inner formwork body, an adjustable vertical rod 27, and an adjustable horizontal rod 28. The inner formwork body includes an adjustable side formwork 24, an adjustable hinge shaft 25, an inner formwork bottom formwork 26, and an inner formwork top formwork 29. A plurality of adjustable side formworks 24 are arranged between the inner formwork top formwork 29 and the inner formwork bottom formwork 26. The adjacent adjustable side formworks 24, the adjustable side formworks 24 and the inner formwork top formwork, and the adjustable side formworks 24 and the inner formwork bottom formwork 26 are all hinged by adjusting the hinge shaft 25, so that the two adjacent formworks can rotate relative to each other; the adjustable side formworks 24, the inner formwork bottom formwork 26, and the inner formwork top formwork 29 are connected to each other to form the inner formwork body. The adjustable vertical rod 27 and the adjustable horizontal rod 28 are arranged inside the inner formwork body to support the inner formwork body. The integral inner mold positioning bracket 20 is used to suspend the inner mold body. The integral inner mold positioning bracket 20 includes a template support beam 21 and a suspension rod 22. The template support beam 21 is connected to the inner mold body through the suspension rod 22. The suspension rod 22 is connected with an adjustment bolt 23. The upper end of the suspension rod 22 is connected to the template support beam 21 through the adjustment bolt 23.

[0033] The construction method of the super-high cast-in-place box girder with small radius and large cross slope in the interchange area is as follows:

[0034] 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;

[0035] Step 2, box beam support 4 installation: box beam support 4 is installed on the steel beam 5. During installation, first build support poles 10 and support cross bars 11, install limit plates 12 and adjustable top supports 13 on the upper ends of support poles 10, install bottom mold support cross beam 7 on the top of support poles 10; set steel support piers 6 below bottom mold support cross beam 7, install jacks 8 on steel support piers 6, and the upper ends of jacks 8 support bottom mold support cross beam 7; adjust bottom mold support cross beam 7 by jacks 8;

[0036] Step 3: box girder formwork installation: the outer formwork of the box girder adopts the bottom steel outer formwork 2, and the inner formwork of the box girder adopts the 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 includes 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;

[0037] Step 4, installation of the steel reinforced support 3: the steel reinforced support 3 includes a steel support middle beam 16, a steel support column 17 and a steel support top beam 18, the steel support top beam 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 support column 17, the steel support top beam 18 is installed on the steel support column 17, and one end of the steel support top beam 18 is supported on the side of the bottom template 15 of the bottom steel outer template 2; the bottom steel outer template of the small radius and large cross slope super-high cast-in-place box beam 1 is reinforced and supported by the steel support middle beam 16, the steel support column 17 and the steel support top beam 18;

[0038] 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;

[0039] Step 6: Box girder construction: Bind the box girder reinforcement and pour the concrete on the bottom steel outer formwork 2.

Claims

1. The construction method of small radius, large cross slope and super-high cast-in-place box girder in the interchange area is characterized by: The specific steps include: 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 transverse 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 supporting beam (7), and a jack (8) is installed on the steel pier (6), with the upper end of the jack (8) supporting the bottom mold supporting beam (7); the bottom mold supporting beam (7) is adjusted by the jack (8).

3. The construction method of the small radius, large transverse 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 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 arranged between the two ends of the inner mold top mold (29) and the inner mold bottom mold (26). Adjacent adjustable side molds (24), the adjustable side molds (24) and the inner mold top mold, and the adjustable side molds (24) and the inner mold bottom mold (26) are all hinged by adjusting hinge shafts (25). An adjustable vertical rod (27) and an adjustable cross rod (28) are arranged inside the inner mold body, and the inner mold body is internally supported by the adjustable vertical rod (27) and the adjustable cross rod (28).

4. The construction method of the small radius, large transverse 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 suspension rod (22). The template bracket crossbeam (21) is connected to the inner mold body through the suspension rod (22). An adjusting bolt (23) is connected to the suspension rod (22). The upper end of the suspension rod (22) is connected to the template bracket crossbeam (21) through the adjusting bolt (23).

5. A super-high cast-in-place box girder with small radius and large transverse slope in an interchange area, characterized in that: The invention is obtained by the construction method of the interchange area small radius large cross slope super-high cast-in-place box girder as described in any one of claims 1-4.

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