Support structure for large-span cast-in-situ beam in confined space

Abstract

The utility model discloses a kind of large-span cast-in-place beam support structures in restricted space, including support (1), column (2) is equipped on the support (1), large unloading block (3) is equipped on the column (2), load-bearing beam (4) is equipped on the large unloading block (3), special-shaped bailey truss (5) is equipped on the load-bearing beam (4), the side of special-shaped bailey truss (5) is equipped with conventional bailey truss (6);The multiple module compositions, so large system structure can be split into multiple modules under the condition of guaranteeing installation support strength, it is convenient to be assembled in section in restricted space, to solve the problem that traditional support is installed and removed difficultly under the space limited scene of bailey beam support tower set in cast-in-place beam construction, stability is insufficient and topography condition (cross river or cross road etc.) Complex, realize the efficient, safe construction of large-span cast-in-place beam in restricted space.

Description

Technical Field

[0001] This utility model belongs to the field of bridge technology. Specifically, this utility model relates to a support structure for a large-span cast-in-place beam in a confined space. Background Technology

[0002] Traditional construction using minimal support points or scaffolding involves first treating the foundation or driving steel pipe piles according to the design, then pouring concrete foundations or arranging steel bases to ensure the load-bearing capacity meets requirements. Subsequently, Bailey beam truss panels are assembled using connectors such as pins and bolts, or scaffolding is erected. Longitudinal beams and distribution beams are laid on top, and finally, the formwork system is installed. During construction, the quality of node connections is strictly controlled, bolts are tightened, pins are hammered in, and diagonal bracing is installed to enhance overall stability. After erection, a preload of 1.1-1.2 times the design load is required to monitor settlement and eliminate inelastic deformation. Once the concrete strength meets the requirements, it is dismantled layer by layer in the order of "support first, then dismantle".

[0003] A patent application published on June 18, 2024, with patent number 201910271504.X, discloses a construction device for a large-span Bailey bridge spanning a karst cave in a tunnel. The device includes a support frame, comprising guide supports and lifting supports positioned on opposite sides of the karst cave pit; a longitudinal track, erected between the guide supports and the lifting supports, with a sliding device on the longitudinal track, the lower end of which is fixedly connected to the end of the Bailey bridge near the lifting support; transverse tracks, laid along the two sides of the karst cave pit; and a traction device, positioned on one side of the lifting support and connected to the front end of the Bailey bridge via a first steel wire rope. This Bailey bridge construction device solves the problem of limited tunnel space preventing the use of large cranes for support frame installation when a tunnel encounters a large karst cave requiring bridge crossing.

[0004] The construction of multi-support scaffolding has obvious spatial limitations: the assembly of its standardized components requires open and flat site conditions, especially for dismantling. When the space under the bridge is limited, some steel pipe piles may not be able to be pulled out. When encountering rivers, roads, or narrow spaces in the construction area, the span of the standard Bailey beam is limited, and some may even be unable to be crossed due to insufficient space or the Bailey beams being unable to cross, resulting in the inability to bring equipment into the site or complete the dismantling work. If large-span Bailey beam scaffolding is used, its own height is relatively high, and the requirements for the clearance above are strict, making some implementations quite difficult. Furthermore, the implementation of the pan-type scaffolding is also quite difficult when encountering roads or water, as it cannot be supported by a reliable foundation. Utility Model Content

[0005] The present invention aims to provide a support structure for large-span cast-in-place beams in confined spaces that can be easily installed in such spaces.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a support structure for a large-span cast-in-place beam in a confined space, including a support, a column on the support, a large unloading block on the column, a load-bearing beam on the large unloading block, an irregular Bailey truss on the load-bearing beam, and a conventional Bailey truss on the side of the irregular Bailey truss.

[0007] The column is a flanged steel pipe, and the outside of the column is equipped with a clamp. The bottom of the column is equipped with a column foot installed on a support.

[0008] The column base is provided with reinforcing bars, and the reinforcing bars on the column base are located inside the support.

[0009] The load-bearing beam is equipped with stiffening plates.

[0010] The irregular Bailey truss and the conventional Bailey truss are provided with truss top supports, and the top of the truss top supports is provided with transverse distribution beams.

[0011] A force-transmitting crossbeam is provided between the load-bearing beam and the irregular Bailey truss.

[0012] Both the irregular Bailey truss and the conventional Bailey truss are equipped with reinforcing support frames.

[0013] The irregular Bailey truss is a right-angled triangle, and the center of the hypotenuse of the irregular Bailey truss is connected to the load-bearing beam.

[0014] Multiple support rods are provided between the force-transmitting crossbeam and the irregular Bailey truss.

[0015] The technical advantages of this utility model are as follows: By dividing the support structure into multiple modules, which consists of steel pipe column support, large unloading blocks, load-bearing beam conversion, conventional Bailey trusses and irregular Bailey trusses, distribution beams and formwork system, the large system structure can be divided into multiple modules while ensuring the strength of the installation support. This facilitates segmented assembly in confined spaces, solving the problems of difficult installation and dismantling, insufficient stability and complex terrain conditions (such as crossing rivers or roads) in the construction of cast-in-place beams using traditional supports. This enables efficient and safe construction of large-span cast-in-place beams in confined spaces. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a structural schematic diagram of a large-span cast-in-place beam support structure in a confined space according to the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of a load-bearing beam in a large-span cast-in-place beam support structure within a confined space.

[0019] The markings in the diagram are as follows: 1. Support; 2. Column; 3. Large unloading block; 4. Load-bearing beam; 5. Irregular Bailey truss; 6. Conventional Bailey truss; 7. Hoop; 8. Column base; 9. Rebar; 10. Stiffening plate; 11. Truss top support; 12. Distribution beam; 13. Force transmission beam; 14. Support frame; 15. Support rod. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0021] Please see Figure 1-2 A large-span cast-in-place beam support structure for confined spaces includes a support 1, a column 2 on the support 1, a large unloading block 3 on the column 2, a load-bearing beam 4 on the large unloading block 3, an irregular Bailey truss 5 on the load-bearing beam 4, and a conventional Bailey truss 6 on the side of the irregular Bailey truss 5. By dividing the support structure into multiple modules, the support structure consists of steel pipe columns 2, large unloading blocks 3, load-bearing beams 4, conventional Bailey trusses 6 and irregular Bailey trusses 5, distribution beams 12, and a formwork system. This allows for the large system structure to be divided into multiple modules while ensuring the strength of the installation support, facilitating segmented assembly within confined spaces. This invention addresses the challenges of installation and dismantling difficulties, insufficient stability, and complex terrain conditions such as river or road crossings associated with traditional Bailey bridge support towers in confined spaces during cast-in-place beam construction. It enables efficient and safe construction of large-span cast-in-place beams within restricted spaces. Column 2, within 2.5m of the edge of support 1, utilizes Φ630×10mm flanged steel pipes with a minimum variable spacing of 1.9m. Both types of Bailey trusses are connected to the load-bearing beam 4 via detachable flanges at the edge of support 1, facilitating segmented assembly within confined spaces. The load-bearing beam 4, above support 1, uses 2HN600×200 steel pipes paired with adjustable large unloading blocks 3 with a height of 2300-2800mm.

[0022] The column 2 is a flanged steel pipe. The outer side of the column 2 is equipped with a clamp 7, and the bottom of the column 2 is equipped with a column foot 8 installed on the support 1. In terms of space utilization, the space occupied by the support 1 is reduced by adjusting the spacing of the steel pipe columns 2 and using clamps 7 to bolt the pier body.

[0023] The column base 8 is equipped with a rebar 9, and the rebar 9 on the column base 8 is located inside the support 1; the rebar 9 is installed at the reserved hole position of the steel pipe column base 8, the rebar 9 depth is not less than 30cm, the exposed length is not less than 15cm, and then the reserved hole of the column base 8 is aligned with the threaded steel bar and inserted, and the double nuts are tightened. A single column 2 is equipped with 4 rebar 9s.

[0024] The load-bearing beam 4 is equipped with stiffening plates 10; the load-bearing beam 4 increases the span bearing capacity by 20% and facilitates segmented assembly in confined spaces.

[0025] The irregular Bailey truss 5 and the conventional Bailey truss 6 are equipped with truss top supports 11, and the top of the truss top supports 11 is equipped with transverse distribution beams 12. The distribution beams 12 are made of 22a steel within 1.5m of the edge of the support 1, with the spacing reduced to 625mm. The elevation adjustment of ±50mm is achieved through the truss top supports 11 to adapt to the slope of the bottom plate of the widened continuous beam. The distribution beams 12 are spaced more closely together with the truss top supports 11 to achieve elevation adjustment to adapt to the slope of the bottom plate of the widened continuous beam. Ten distribution beams 12 are hoisted at one time and placed on the truss, corresponding to ten positions, and so on.

[0026] A force-transmitting beam 13 is provided between the load-bearing beam 4 and the irregular Bailey truss 5; 2HN600×200 steel is installed above the unloading block as a force-transmitting beam 13, which is used to distribute the pressure and reduce the risk of the irregular Bailey truss 5 breaking.

[0027] Both the irregular Bailey truss 5 and the conventional Bailey truss 6 are equipped with reinforcing support frames 14 to enhance the overall structural strength and improve load-bearing capacity.

[0028] The irregular Bailey truss 5 is a right-angled triangle, and the center of the hypotenuse of the irregular Bailey truss 5 is connected to the load-bearing beam 4; this reduces the footprint and facilitates installation.

[0029] Multiple support rods 15 are provided between the force transmission beam 13 and the irregular Bailey truss 5 to improve the support capacity.

[0030] The Bailey bridge scaffolding system has significant advantages in many aspects after its renovation. In terms of space utilization, the space occupied by the support 1 is reduced by adjusting the spacing of the steel pipe columns 2 and using clamps 7 to bolt the pier body. The spacing of the distribution beams 12 is increased and the elevation is adjusted in conjunction with the truss top support 11 to adapt to the slope of the bottom plate of the widened continuous beam. In terms of load-bearing capacity, the XT300 truss is used and the connection nodes are modified, and the web stiffening plates 10 are added, which increases the span load-bearing capacity to 32.7m without any driven piles in the middle. In terms of construction efficiency, the large unloading block 3 is equipped with an operating window and a spiral jack to achieve symmetrical unloading. The truss is assembled in sections in the support 1 area and the weight of each section is controlled within 2.5t, which is convenient for hoisting in confined spaces. In terms of safety, the cross bracing of the channel steel between the steel pipe columns 2 enhances the overall stability, and the load-bearing beams 4 are connected by L-shaped transition steel plates, which increases the shear bearing capacity of the nodes by 30%.

[0031] The technical advantages of this utility model are as follows: By dividing the support structure into multiple modules, which consists of steel pipe columns 2 for support, large unloading blocks 3, load-bearing beams 4 for conversion, conventional Bailey trusses 6 and irregular Bailey trusses 5, distribution beams 12 and formwork system, the large system structure can be divided into multiple modules while ensuring the strength of the installation support. This facilitates segmented assembly in confined spaces, solving the problems of difficult installation and dismantling, insufficient stability, and complex terrain conditions such as crossing rivers or roads in the construction of cast-in-place beams under confined space conditions of traditional supports. This enables efficient and safe construction of large-span cast-in-place beams in confined spaces.

[0032] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A support structure for a large-span cast-in-place beam in a confined space, comprising a support (1), characterized in that: The support (1) is provided with a column (2), the column (2) is provided with a large unloading block (3), the large unloading block (3) is provided with a load-bearing beam (4), the load-bearing beam (4) is provided with an irregular Bailey truss (5), and the side of the irregular Bailey truss (5) is provided with a conventional Bailey truss (6).

2. The large-span cast-in-place beam support structure in a confined space according to claim 1, characterized in that: The column (2) is a flanged steel pipe, and the outside of the column (2) is provided with a clamp (7). The bottom of the column (2) is provided with a column foot (8) installed on the support (1).

3. The large-span cast-in-place beam support structure in a confined space according to claim 2, characterized in that: The column base (8) is provided with reinforcing bars (9), and the reinforcing bars (9) on the column base (8) are located inside the support (1).

4. The large-span cast-in-place beam support structure in a confined space according to claim 1, characterized in that: The load-bearing beam (4) is provided with stiffening plates (10).

5. The large-span cast-in-place beam support structure in a confined space according to claim 1, characterized in that: The irregular Bailey truss (5) and the conventional Bailey truss (6) are provided with truss top supports (11) at the top, and the truss top supports (11) are provided with transverse distribution beams (12) at the top.

6. The large-span cast-in-place beam support structure in a confined space according to claim 1, characterized in that: A force-transmitting crossbeam (13) is provided between the load-bearing beam (4) and the irregular Bailey truss (5).

7. A large-span cast-in-place beam support structure in a confined space according to claim 1 or 2, characterized in that: Both the irregular Bailey truss (5) and the conventional Bailey truss (6) are equipped with reinforcing support frames (14).

8. A large-span cast-in-place beam support structure in a confined space according to claim 1 or 2, characterized in that: The irregular Bailey truss (5) is a right triangle, and the center of the hypotenuse of the irregular Bailey truss (5) is connected to the load-bearing beam (4).

9. A large-span cast-in-place beam support structure in a confined space according to claim 6, characterized in that: Multiple support rods (15) are provided between the force-transmitting crossbeam (13) and the irregular Bailey truss (5).

Images