Intercommunication area small-radius large-cross-slope ultrahigh cast-in-place box girder construction system

Abstract

The utility model relates to an ultra-high cast-in-place box girder construction system with a small radius and a large cross slope in an intercommunication area. The ultra-high cast-in-place box girder construction system comprises a cast-in-place box girder, a bottom-wrapped profile steel outer mold, a profile steel reinforcing bracket, a box girder bracket, a profile steel cross beam, a bottom mold supporting cross beam and an adjustable integral inner mold, the bottom-wrapped profile steel outer mold comprises a bottom mold plate and box girder outer side mold plates located on the two sides of the bottom mold plate. The box girder support comprises a support vertical rod and a support transverse rod, a limiting plate and an adjustable jacking are arranged at the upper end of the support vertical rod, and the bottom die supporting cross beam is arranged at the upper end of the support vertical rod; a bottom template of the bottom-wrapped profile steel outer mold is arranged on the bottom mold supporting cross beam; the profile steel reinforced support comprises a profile steel support middle cross beam, profile steel support stand columns and a profile steel support top cross beam, and the profile steel support top cross beam is arranged below the box girder outer side formwork. The utility model belongs to the field of civil engineering, aims at a construction method of a small-radius large-cross-slope ultrahigh cast-in-place box girder in an intercommunication area, effectively reduces the engineering cost, accelerates the construction speed, and can obtain better technical and economic benefits when being applied to actual engineering.

Description

Technical Field

[0001] This utility model relates to a construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas. It belongs to the field of civil engineering and is applicable to the construction of ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas. Background Technology

[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 bridges are currently moving towards larger and longer structures, while also placing greater emphasis on bridge aesthetics and environmental protection. Therefore, the ultra-long prestressed construction technology for cast-in-place box girder bridges will be increasingly widely used in bridge construction in my country.

[0003] However, conventional small-radius, large-slope cast-in-place box girder construction has disadvantages such as difficulty in installing and positioning formwork supports and box girder inner formwork, and low construction efficiency. Summary of the Invention

[0004] The purpose of this utility model is to address the problem of constructing ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas, and to provide a method for constructing such girders to meet the needs of structural construction.

[0005] To achieve the above technical objectives, this utility model adopts the following technical solution: a construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas, including cast-in-place box girders, bottom-encased steel outer formwork, steel reinforcement supports, box girder supports, steel crossbeams, bottom formwork support crossbeams, and adjustable integral inner formwork; the bottom-encased steel outer formwork includes a bottom template and outer box girder templates located on both sides of the bottom template; the box girder supports include support uprights and support crossbeams, with limit plates and adjustable top supports provided at the upper ends of the support uprights, and the bottom formwork support crossbeams are located at the upper ends of the support uprights; the bottom template of the bottom-encased steel outer formwork is located on the bottom formwork support crossbeams;

[0006] The steel reinforcement support includes a crossbeam, columns, and a top crossbeam. The top crossbeam is located below the outer formwork of the box girder, and the columns are located between the top crossbeam and the crossbeam. The adjustable integral inner mold includes an integral inner mold positioning support, an inner mold body, adjustable columns, and adjustable crossbars.

[0007] Preferably, a steel support is installed below the bottom formwork support beam, and a jack is installed on the steel support. The upper end of the jack supports the bottom formwork support beam; the bottom formwork support beam is adjusted by the jack.

[0008] Preferably, a height adjustment block is provided between the jack and the bottom formwork support beam.

[0009] Preferably, the crossbeams in the steel frame are connected to the columns of the steel frame, and one end of the crossbeams in the steel frame abuts against the side of the bottom formwork.

[0010] Preferably, the inner mold body includes an inner template top mold and an inner template bottom mold. Several adjustable side molds are provided between the two ends of the inner template top mold and the inner template bottom mold. Adjacent adjustable side molds, adjustable side molds and inner template top molds, and adjustable side molds and inner template bottom molds are all hinged by adjusting hinge shafts. Adjustable uprights and adjustable crossbars are provided inside the inner mold body to provide internal support for the inner mold body.

[0011] As a preferred embodiment, the overall inner mold positioning support includes a template support beam and a hanger. The template support beam is connected to the inner mold body through the hanger. Adjusting bolts are connected to the hanger, and the upper end of the hanger is connected to the template support beam through the adjusting bolt.

[0012] This utility model has the following features and beneficial effects:

[0013] (1) Box girder supports and steel reinforced supports were used to adjust the formwork support of ultra-high cast-in-place box girders with large cross slopes, thereby improving the construction efficiency of formwork support for ultra-high cast-in-place box girders with small radius and large cross slopes in the interchange area.

[0014] (2) Adjustable top supports, jacks and height adjustment blocks are used to precisely adjust the installation position of the box girder formwork, thereby improving the installation positioning accuracy of the super high cast-in-place box girder formwork with small radius and large cross slope in the interchange area;

[0015] (3) Adjustable integral inner mold and integral inner mold positioning bracket are used for the installation of box girder inner mold to improve the efficiency and quality of box girder inner mold installation. Attached Figure Description

[0016] Figure 1 This is a construction structural diagram of a small-radius, large-slope, ultra-high cast-in-place box girder in the interchange area;

[0017] Figure 2 This is a structural drawing of the formwork and support structure for cast-in-place box girders;

[0018] Figure 3 This is a structural diagram of a steel-reinforced support frame;

[0019] Figure 4 This is a diagram of an adjustable integral internal mold structure.

[0020] In the diagram: 1. Cast-in-place box girder; 2. Outer formwork of bottom steel section; 3. Steel reinforcement support; 4. Box girder support; 5. Steel crossbeam; 6. Steel pier; 7. Bottom formwork support crossbeam; 8. Jack; 9. Height adjustment block; 10. Support upright; 11. Support crossbar; 12. Limiting plate; 13. Adjustable top support; 14. Outer formwork of box girder; 15. Bottom formwork; 16. Middle crossbeam of steel support; 17. Steel support column; 18. Top crossbeam of steel support; 19. Adjustable integral inner formwork; 20. Integral inner formwork positioning support; 21. Formwork support crossbeam; 22. Hanging rod; 23. Adjusting bolt; 24. Adjustable side formwork; 25. Adjusting hinge shaft; 26. Inner formwork bottom formwork; 27. Adjustable upright; 28. Adjustable crossbar; 29. ​​Inner formwork top formwork. Detailed Implementation

[0021] The detailed structural treatment and other construction technical requirements in the embodiments of this utility model will not be repeated. The focus is on describing the implementation of this utility model. The following description, in conjunction with the accompanying drawings and through embodiments, will provide a more detailed explanation of this utility model. This description is not limited to the following embodiments.

[0022] Figure 1 This is the construction structure drawing of the ultra-high cast-in-place box girder with a small radius and large cross slope in the interchange area. Figure 2 This is the structural drawing of the formwork and support for cast-in-place box girder 1. Figure 3 This is a structural diagram of the steel-reinforced support frame 3. Figure 4 This is a structural diagram of an adjustable integral inner mold (model 19).

[0023] like Figure 1 The construction structure diagram of the ultra-high cast-in-place box girder 1 with a small radius and large cross slope in the interchange area shown includes the cast-in-place box girder 1, the bottom-encased steel outer formwork 2, the steel reinforcing support 3, the box girder support 4, the steel crossbeam 5, the steel pier 6, the bottom formwork support crossbeam 7, the jack 8, and the height adjustment block 9. For the construction of the ultra-high cast-in-place box girder with a small radius and large cross slope in the interchange area, the box girder support 4 and the steel reinforcing support 3 are set on the steel crossbeam 5 to support the bottom-encased steel outer formwork 2 and the bottom formwork support crossbeam 7. The steel pier 6, the jack 8, and the height adjustment block 9 are set on the steel crossbeam 5 to adjust the bottom formwork support crossbeam 7. The bottom-encased steel outer formwork 2 is used for casting the cast-in-place box girder 1.

[0024] Among them, the bottom steel outer formwork 2 includes the bottom formwork 15 and the outer formwork 14 of the box girder located on both sides of the bottom formwork 15.

[0025] like Figure 2The diagram shows the formwork and support structure for the cast-in-place box girder. The box girder support 4 includes support uprights 10 and support crossbars 11. The upper end of the support uprights 10 is equipped with a limit plate 12 and an adjustable top support 13, used for positioning and supporting the outer formwork 14 and bottom formwork 15 of the box girder, and for adjusting the installation positions of the outer formwork 14 and bottom formwork 15. The support uprights 10 are arranged vertically, and the support crossbars 11 are arranged horizontally. The bottom formwork support beam 7 is located at the upper end of the support uprights 10. The bottom formwork 15 of the outer formwork 2 is mounted on the bottom formwork support beam 7.

[0026] A steel support pier 6 is installed below the bottom formwork support beam 7. A jack 8 is installed on the steel support pier 6, with the upper end of the jack 8 pressing against the bottom formwork support beam 7 for adjustment. A height adjustment block 9 is provided between the jack 8 and the bottom formwork support beam 7.

[0027] like Figure 3 The diagram shows the structure of the steel reinforcement support 3. The steel reinforcement support 3 includes a middle crossbeam 16, steel support columns 17, and a top crossbeam 18. The steel reinforcement support 3 is used to reinforce and support the bottom steel outer formwork 2 of the small-radius, large-slope, ultra-high cast-in-place box girder 1. The top crossbeam 1 is located below the outer formwork 14 of the box girder, and the steel support columns 17 are located between the top crossbeam 1 and the steel crossbeam 5, used to reinforce and support the outer formwork 14 of the box girder. The middle crossbeam 16 is arranged horizontally and connected to the steel support columns 17. One end of the middle crossbeam 16 abuts against the side of the bottom formwork 15.

[0028] like Figure 4The adjustable integral inner mold structure diagram shown illustrates that the cast-in-place box girder 1 uses an adjustable integral inner mold 19 as the inner casting template. The adjustable integral inner mold 19 includes an integral inner mold positioning bracket 20, an inner mold body, adjustable uprights 27, and adjustable crossbars 28. The inner mold body includes adjustable side templates 24, adjusting hinge pins 25, an inner mold bottom 26, and an inner mold top 29. Several adjustable side templates 24 are provided between the two ends of the inner mold top 29 and the inner mold bottom 26. Adjacent adjustable side templates 24, between adjustable side templates 24 and the inner mold top 26, and between adjustable side templates 24 and the inner mold bottom 26 are all hinged by adjusting hinge pins 25, allowing relative rotation between adjacent templates. The adjustable side templates 24, inner mold bottom 26, and inner mold top 29 are interconnected to form the inner mold body. The adjustable uprights 27 and adjustable crossbars 28 are located inside the inner mold body to support it. The integral inner mold positioning bracket 20 is used to hoist the inner mold body. The integral inner mold positioning bracket 20 includes a template support beam 21 and a hanging rod 22. The template support beam 21 is connected to the inner mold body through the hanging rod 22. An adjusting bolt 23 is connected to the hanging rod 22. The upper end of the hanging rod 22 is connected to the template support beam 21 through the adjusting bolt 23.

[0029] The construction method for ultra-high cast-in-place box girders with small radius and large cross slope in the interchange area is as follows:

[0030] Step 1: Installation of supports and steel beams 5: Erect supports under the cast-in-place box girder 1 and install steel beams 5;

[0031] Step 2, Box Girder Support 4 Installation: Install the box girder support 4 on the steel crossbeam 5. During installation, first erect the support uprights 10 and support crossbeams 11. Install the limiting plate 12 and adjustable top support 13 on the upper end of the support uprights 10. Install the bottom formwork support beam 7 on the top of the support uprights 10. Set up steel supports 6 below the bottom formwork support beam 7. Install jacks 8 on the steel supports 6. The upper end of the jacks 8 supports the bottom formwork support beam 7. Adjust the bottom formwork support beam 7 using the jacks 8.

[0032] Step 3, Box Girder Formwork Installation: The outer formwork of the box girder adopts the bottom-encased steel outer formwork 2, and the inner formwork of the box girder adopts the adjustable integral inner formwork 19. The bottom-encased steel outer formwork 2 is placed on the bottom formwork support beam 7. The adjustable integral inner formwork 19 includes the inner formwork body and the integral inner formwork positioning bracket 20. The inner formwork body is hoisted into the bottom-encased steel outer formwork 2 through the integral inner formwork positioning bracket 20.

[0033] Step 4: Installation of Steel Reinforcement Support 3: The steel reinforcement support 3 includes a middle crossbeam 16, a steel support column 17, and a top crossbeam 18. The top crossbeam 18 is installed on the lower side of the outer template 14 of the box girder of the bottom steel outer formwork 2. The bottom steel outer formwork 2 is supported by the steel support column 17. The top crossbeam 18 is installed on the steel support column 17, with one end of the top crossbeam 18 abutting against the side of the bottom template 15 of the bottom steel outer formwork 2. The middle crossbeam 16, the steel support column 17, and the top crossbeam 18 reinforce the bottom steel outer formwork of the small-radius, large-slope, ultra-high cast-in-place box girder 1.

[0034] Step 5, Pre-stressing of supports: The steel reinforced support 3 and the box girder support 4 are pre-stressed in sections using water bags;

[0035] Step 6, Box Girder Construction: The reinforcement of the box girder is tied and the concrete is poured on the outer formwork 2 of the bottom steel frame.

Claims

1. A construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas, characterized by: The system includes a cast-in-place box girder (1), a bottom-encased steel outer formwork (2), a steel reinforcement bracket (3), a box girder bracket (4), a steel crossbeam (5), a bottom formwork support crossbeam (7), and an adjustable integral inner formwork (19). The bottom-encased steel outer formwork (2) includes a bottom template (15) and box girder outer templates (14) located on both sides of the bottom template (15). The box girder bracket (4) includes a bracket upright (10) and a bracket crossbeam (11). The upper end of the bracket upright (10) is provided with a limit plate (12) and an adjustable top support (13). The bottom formwork support crossbeam (7) is located at the upper end of the bracket upright (10). The bottom template (15) of the bottom-encased steel outer formwork (2) is located on the bottom formwork support crossbeam (7). The steel reinforcement support (3) includes a crossbeam (16) in the middle of the steel support, a column (17) in the steel support and a top crossbeam (18) in the steel support. The top crossbeam (18) in the steel support is located below the outer template (14) of the box girder, and the column (17) in the steel support is located between the top crossbeam (18) and the crossbeam (5) in the steel support. The adjustable integral inner mold (19) includes an integral inner mold positioning support (20), an inner mold body, an adjustable upright (27), and an adjustable crossbar (28).

2. The construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas according to claim 1, characterized in that, A steel support pier (6) is set below the bottom formwork support beam (7), and a jack (8) is installed on the steel support pier (6). The upper end of the jack (8) supports the bottom formwork support beam (7); the bottom formwork support beam (7) is adjusted by the jack (8).

3. The construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas according to claim 2, characterized in that, A height adjustment block (9) is provided between the jack (8) and the bottom formwork support beam (7).

4. The construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas according to claim 1, characterized in that, The crossbeam (16) of the steel frame is connected to the column (17) of the steel frame, and one end of the crossbeam (16) of the steel frame abuts against the side of the bottom template (15).

5. The construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas according to claim 1, characterized in that, The inner mold body includes an inner template top mold (29) and an inner template bottom mold (26). Several adjustable side molds (24) are provided between the two ends of the inner template top mold (29) and the inner template bottom mold (26). The adjacent adjustable side molds (24), the adjustable side molds (24) and the inner template top mold, and the adjustable side molds (24) and the inner template bottom mold (26) are all hinged by adjusting hinge shafts (25). The inner mold body is provided with adjustable uprights (27) and adjustable crossbars (28). The adjustable uprights (27) and adjustable crossbars (28) provide internal support for the inner mold body.

6. The construction system for ultra-high cast-in-place box girders with small radius and large cross slope in interchange areas according to claim 1, characterized in that, The overall inner mold positioning bracket (20) includes a template bracket beam (21) and a hanger (22). The template bracket beam (21) is connected to the inner mold body through the hanger (22). An adjusting bolt (23) is connected to the hanger (22). The upper end of the hanger (22) is connected to the template bracket beam (21) through the adjusting bolt (23).

Images