An assembled double-layer corrugated steel-UHPC stiffening rib composite structure and construction method

Abstract

The present invention provides an assembled double-layer corrugated steel-UHPC stiffening rib composite structure and a construction method, which belong to the technical field of arched corrugated steel composite structures. In order to solve the problem that the existing arched corrugated steel roof needs to set up side molds and build temporary supports when cast in situ, the processing technology is high, the curing time is long, the construction speed is slow, and the thermal insulation effect is poor. It includes two layers of corrugated steel connected by embedded parts, and a plurality of UHPC stiffening ribs are arranged between the two layers of corrugated steel. The UHPC stiffening ribs include at least one UHPC stiffening rib unit, and the shape of each UHPC stiffening rib unit matches the shape between the two layers of corrugated steel. The space or gap between the two layers of corrugated steel except the UHPC stiffening ribs is filled with lightweight filler. The present invention is an assembled structure. Compared with cast-in-situ construction, it improves the construction speed and has higher construction efficiency; it also adds thermal insulation function and has relatively strong bearing capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of arched corrugated steel composite structures, and in particular to an assembled double-layer corrugated steel-UHPC stiffening rib composite structure and a construction method. Background Art

[0002] Arched corrugated steel structure (also known as beamless arch or space tile) is a new type of spatial light steel structure. This structure has the advantages of light weight, material saving, fast construction speed, low cost (excluding insulation), high indoor clearance, large spanning capacity, beautiful shape, and excellent performance. In the 1940s, some American structural engineers were inspired by the structural shape of the plant epidermis texture in nature and began to seek to use extremely thin materials to reinforce the corrugation to make a larger span structure. They used thin steel plates as materials, established mechanical models, and theoretically analyzed reasonable structural forms. On the road to realizing this structure, structural engineers and mechanics came together. The structural construction requirements guided the mechanics to develop a unit that can produce corrugated thin-walled structures. This is the metal roof forming machine.

[0003] Existing arched corrugated steel roofs are generally single-layered during assembly. Single-layer corrugated steel roofs have low bearing capacity and often fail (structural collapse) under snow loads or wind loads, causing huge casualties and economic losses. At the same time, single-layer corrugated steel roofs have poor thermal insulation performance. When the arched corrugated steel roof is double-layered, the two layers of corrugated steel need to be fixed and concrete poured in the middle. During the pouring process, side formwork is required to prevent leakage and temporary supports are built. The processing technology is relatively high, and the concrete needs to be cured for at least 28 days after pouring. The construction speed is slow, affecting construction efficiency. In addition, the thermal insulation performance of existing arched corrugated steel roofs is relatively poor, making them difficult to use in buildings with high thermal insulation requirements. Summary of the Invention

[0004] The technical problems to be solved by the present invention are:

[0005] In order to solve the problems of poor bearing capacity and thermal insulation of existing single-layer arched corrugated steel roof, double-layer arched corrugated steel roof needs to set up side formwork and build temporary support when cast in place, which requires high processing technology, long curing time, slow construction speed and poor thermal insulation effect.

[0006] The present invention is to solve the above technical problems using the following technical solutions:

[0007] The present invention provides an assembled double-layer corrugated steel-UHPC stiffening rib composite structure, comprising two layers of corrugated steel connected by embedded parts, wherein the corrugated steel layers are prefabricated corrugated steel layers, each corrugated steel layer comprises a plurality of spliced ​​corrugated steel plates, the crests and troughs of the upper and lower corrugated steel layers are relative or staggered, a plurality of UHPC stiffening ribs are arranged between the two layers of corrugated steel, wherein the UHPC stiffening ribs are prefabricated UHPC stiffening ribs, each UHPC stiffening rib comprises at least one UHPC stiffening rib unit, the shape of each UHPC stiffening rib unit matches the shape between the two layers of corrugated steel, and the space or gap between the two layers of corrugated steel except the UHPC stiffening ribs is filled with lightweight filler.

[0008] Furthermore, the corrugated steel layer includes a plurality of corrugated steel plates connected by high-strength bolts, and a waterproof pad is provided between the nuts of the high-strength bolts and the corrugated steel layer.

[0009] Furthermore, a plurality of interlayer supports are provided on the corrugated steel layer between two adjacent UHPC stiffening ribs, and the interlayer supports are evenly distributed along the arched extension direction of the corrugated steel layer.

[0010] Furthermore, the interlayer support is an X-shaped bracket, and the ends of the X-shaped bracket are connected to the upper and lower corrugated steel layers by high-strength bolts.

[0011] Furthermore, both ends of the bottom of the X-shaped bracket are arranged at the trough of the corrugated steel layer, and the intersection of the X-shaped bracket is located above the peak of the lower corrugated steel layer.

[0012] Furthermore, the embedded part is an embedded anchor bolt, both ends of which pass through two layers of corrugated steel and are fixed by nuts, and a waterproof pad is provided between the nuts and the corrugated steel layer.

[0013] Furthermore, the embedded anchor bolts are evenly distributed at the crests or troughs of the two corrugated steel layers.

[0014] Furthermore, the lightweight filler may be a flame retardant foaming agent, lightweight concrete or rock wool.

[0015] Furthermore, the shape of each UHPC stiffening rib unit matches the shape between two adjacent wave crests or two adjacent wave troughs.

[0016] The present invention provides a construction method for an assembled double-layer corrugated steel-UHPC stiffening rib composite structure, comprising the following steps: placing a lower corrugated steel layer on the ground at a construction site, placing UHPC stiffening ribs on the lower corrugated steel layer in sequence according to construction requirements, wherein the UHPC stiffening ribs are provided with embedded anchor bolts, and the embedded anchor bolts can penetrate corresponding bolt holes of the upper and lower corrugated steel layers; then, the upper corrugated steel layer is hoisted onto the lower corrugated steel layer; and the embedded anchor bolts penetrating the upper and lower corrugated steel layers are tightened by nuts; and then, a lightweight filler is filled in the space between the two corrugated steel layers.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention discloses an assembled double-layer corrugated steel-UHPC stiffening rib composite structure, comprising two prefabricated corrugated steel layers connected by embedded parts, wherein each corrugated steel layer comprises a plurality of spliced ​​corrugated steel plates, and the crests and troughs of the upper and lower corrugated steel layers are opposite or staggered, and a plurality of UHPC stiffening ribs are arranged between the two corrugated steel layers. The UHPC stiffening ribs are prefabricated UHPC stiffening ribs, and the UHPC stiffening ribs include at least one UHPC stiffening rib unit. The shape of each UHPC stiffening rib unit matches the shape between the two corrugated steel layers, and the space or gap between the two corrugated steel layers except the UHPC stiffening ribs is filled with lightweight filler.

[0019] The present invention provides a construction method for an assembled double-layer corrugated steel-UHPC stiffening rib composite structure. During the assembly process, since the UHPC stiffening ribs and the corrugated steel layers are both prefabricated, it is only necessary to fill the space between the two layers of corrugated steel with lightweight filler. No side formwork is required, the processing requirements are relatively low, the curing period of the concrete is shortened, the construction steps are effectively reduced, the construction speed is increased, and the construction efficiency is high.

[0020] The double-layer corrugated steel roof has a better thermal insulation effect than the single-layer corrugated steel roof, which is equivalent to the thermal insulation layer. It can be used for granary roofs and warm corridors, as well as large-span roofs and station roofs. Compared with the existing arched corrugated steel roof, it has a wider range of applications and achieves thermal insulation function.

[0021] Because UHPC stiffeners are installed between the two layers of corrugated steel, the combination of the two greatly improves the overall bearing capacity of the arched corrugated steel. At the same time, UHPC stiffeners are high in strength, lightweight compared to concrete, and can be hoisted, making them more convenient for transportation and installation during assembly. At the same time, the UHPC stiffeners are connected to the upper and lower layers of corrugated steel through embedded parts, creating a combined effect between the UHPC stiffeners and the upper and lower layers of corrugated steel. The three work together to greatly improve the mechanical properties of the structure.

[0022] The lightweight filler has good thermal insulation effect, which is further enhanced by the double-layer corrugated steel layer. It also inhibits the buckling failure of the corrugated steel and improves the overall strength. It fully utilizes the water-insulating effect of the corrugated steel to effectively prevent water seepage in the structure.

[0023] Since the lightweight filler is filled between the two layers of corrugated steel to form a lightweight structure, combined with UHPC stiffeners, it is equivalent to a poured concrete structure, ensuring overall high bearing capacity with a relatively light weight. The spacing between the two layers of corrugated steel can also be increased according to design requirements. As the spacing increases, the bearing capacity is further increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of an assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to an embodiment of the present invention;

[0025] Figure 2 is a three-dimensional diagram of the corrugated steel layer in an embodiment of the present invention;

[0026] Figure 3 A side view of an assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to an embodiment of the present invention Figure 1 ;

[0027] Figure 4 A side view of an assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to an embodiment of the present invention Figure 2 ;

[0028] Figure 5 A partial perspective view of an assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to an embodiment of the present invention;

[0029] Figure 6 for Figure 5 Exploded diagram;

[0030] Figure 7 This is a comparison chart of the mechanical properties of the present invention and a single-layer corrugated steel roof.

[0031] Description of reference numerals:

[0032] 1. Corrugated steel layer; 2. Lightweight filling material layer; 3. UHPC stiffeners; 4. Interlayer support; 5. Embedded parts; 6. Waterproof pad. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be noted that the terminology in each embodiment, such as "up", "down", "front", "back", "left", "right", etc., which indicate directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated in accordance with the specific directions and defined operations and methods and structures in the specification. Such directional nouns do not constitute a limitation to the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Specific implementation plan 1: Combined Figures 1 to 7 As shown, the present invention provides an assembled double-layer corrugated steel-UHPC stiffening rib composite structure, comprising two layers of corrugated steel layers 1 connected by embedded parts 5, each layer of corrugated steel layer 1 comprising a plurality of spliced ​​corrugated steel plates, the corrugated steel layer 1 is a prefabricated corrugated steel layer, the crests and troughs of the upper and lower layers of corrugated steel layers 1 are opposite or staggered, that is, the crests of the upper corrugated steel layer 1 are opposite to the troughs of the lower corrugated steel layer 1, or the crests of the upper corrugated steel layer 1 are opposite to the crests of the lower corrugated steel layer 1, and the two layers of corrugated steel layers are opposite to each other. A plurality of UHPC stiffening ribs 3 are arranged between the steel layers 1. The UHPC stiffening ribs 3 are prefabricated UHPC stiffening ribs. The UHPC stiffening ribs 3 include at least one UHPC stiffening rib unit. The shape of each UHPC stiffening rib unit matches the shape between the two corrugated steel layers 1. The space or gap between the two corrugated steel layers 1 except the UHPC stiffening ribs 3 is filled with lightweight filler. The lightweight filler filled between two adjacent UHPC stiffening ribs 3 is a lightweight filler layer 2.

[0036] During the assembly process, since the corrugated steel layer 1 and the UHPC stiffeners 3 are both prefabricated, it is only necessary to fill the space between the two layers of corrugated steel layers 1 with lightweight filler. No side formwork is required, which places relatively low demands on the processing technology. This also shortens the curing period of the concrete, effectively saves construction steps, increases construction speed, and has high construction efficiency.

[0037] The double-layer corrugated steel layer 1 has a good thermal insulation effect, which is equivalent to a thermal insulation layer. It can be used for granary roofs and warm corridors, as well as large-span roofs and station roofs. Compared with the existing arched corrugated steel, it has achieved thermal insulation function and has a wider range of applications.

[0038] Because UHPC stiffeners 3 are provided between the two layers of corrugated steel 1, the combination of the two greatly improves the overall bearing capacity of the arched corrugated steel. Furthermore, the UHPC stiffeners 3 are high in strength, lightweight compared to concrete, and can be hoisted, making them more convenient for transportation and installation during assembly. Furthermore, the UHPC stiffeners 3 are connected to the upper and lower layers of corrugated steel 1 via embedded components 5, creating a combined effect between the UHPC stiffeners 3 and the upper and lower layers of corrugated steel 1. The three work together to greatly improve the mechanical properties of the structure.

[0039] The lightweight filler has good thermal insulation effect. The thermal insulation effect is further improved when combined with the double-layer corrugated steel layer 1. At the same time, it can inhibit the buckling failure of the corrugated steel and improve the overall strength. It fully utilizes the water-insulating effect of the corrugated steel to effectively prevent water seepage in the structure.

[0040] Since the lightweight filler is filled between the two layers of corrugated steel 1, it forms a lightweight structure. Together with the UHPC stiffener 3, it is equivalent to a poured concrete structure. It ensures high overall bearing capacity with a relatively light weight. The spacing between the two layers of corrugated steel 1 can be increased according to design requirements. As the spacing increases, the bearing capacity is further increased. Figure 7 As shown, experiments have proved that under the condition of the same amount of corrugated steel, the load of the structure of the present invention is about 16.6 times that of the single-layer corrugated steel roof structure, which significantly improves the overall bearing capacity.

[0041] Preferably, the corrugated steel layer 1 comprises a plurality of corrugated steel sheets connected by high-strength bolts to form an upper and lower layer of corrugated steel sheets. In this application, the upper layer is equivalent to the outer layer, and the lower layer is equivalent to the inner layer. A waterproof pad 6 is provided between the nuts of the high-strength bolts and the corrugated steel layer 1 to prevent water seepage.

[0042] Preferably, a plurality of interlayer supports 4 are provided on the corrugated steel layer 1 between two adjacent UHPC stiffeners 3. The interlayer supports 4 are evenly arranged along the extension direction of the corrugated steel and serve to support the two layers of corrugated steel 1, thereby ensuring uniform internal spacing between the two layers of corrugated steel 1 and improving overall strength and bearing capacity, as well as the tightness of the connection between the flame retardant foaming agent and the corrugated steel layer 1. The X-shaped supports have the function of preventing the corrugated steel from buckling. At the same time, the X-shaped supports can serve as shear connectors between the filler material and the upper and lower layers of corrugated steel, thereby providing a combined effect between the filler material and the upper and lower layers of corrugated steel, allowing the three to work together.

[0043] Preferably, the interlayer support 4 is an X-shaped bracket, and the X-shaped bracket is connected to the upper and lower corrugated steel layers 1 through high-strength bolts, and a waterproof pad 6 is provided between the nut of the high-strength bolt and the corrugated steel layer 1.

[0044] Preferably, both ends of the bottom of the X-shaped bracket are arranged at the trough of the corrugated steel layer 1, and the intersection of the X-shaped bracket is located above the peak of the corrugated steel layer 1.

[0045] Preferably, the embedded part 5 is an embedded anchor bolt, which passes through two layers of corrugated steel layers 1 and is fixed by a nut, and a waterproof pad 6 is provided between the nut and the corrugated steel layer 1.

[0046] Preferably, the embedded anchor bolts are evenly distributed at the crests or troughs of the two corrugated steel layers 1 .

[0047] Preferably, the lightweight filler may be a flame retardant foaming agent, lightweight concrete or rock wool.

[0048] Preferably, the shape of each UHPC stiffening rib unit matches the shape between two adjacent wave crests or two adjacent wave troughs.

[0049] Specific implementation plan 2: Combined Figures 1 to 4 As shown, the present invention provides a construction method for an assembled, high-bearing-capacity, double-layer corrugated steel-UHPC stiffening rib 3-flame-retardant foaming agent composite structure, comprising the following steps: placing an inner corrugated steel layer 1 on the ground at the construction site; sequentially placing UHPC stiffening ribs 3 on the inner corrugated steel layer 1 according to construction requirements; the UHPC stiffening ribs 3 are provided with embedded anchor bolts that penetrate corresponding bolt holes in the upper and lower corrugated steel layers 1; hoisting the outer corrugated steel layer 1 onto the inner corrugated steel layer 1; and tightening the embedded anchor bolts that penetrate the upper and lower corrugated steel layers 1 with nuts; and finally filling the space between the two corrugated steel layers 1 with a lightweight filler. Other combinations and connection relationships of this embodiment are the same as those of the first specific embodiment.

[0050] Although the present invention is disclosed as above, the scope of protection disclosed by the present invention is not limited thereto. Those skilled in the art of the present invention may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A construction method for an assembled double-layer corrugated steel-UHPC stiffening rib composite structure, characterized in that: The following steps are involved: The lower corrugated steel layer (1) is placed on the ground at the construction site, and the UHPC stiffening ribs (3) are sequentially placed on the lower corrugated steel layer (1) according to the construction requirements, wherein the UHPC stiffening ribs (3) are provided with embedded anchor bolts, and the embedded anchor bolts can penetrate the corresponding bolt holes of the upper and lower corrugated steel layers (1), and then the upper corrugated steel layer (1) is hoisted onto the lower corrugated steel layer (1) and the embedded anchor bolts penetrating the upper and lower corrugated steel layers (1) are tightened by nuts, and then the space between the two corrugated steel layers (1) is filled with lightweight filler; The assembled double-layer corrugated steel-UHPC stiffening rib composite structure comprises two layers of corrugated steel (1) connected by embedded parts (5), the corrugated steel layer (1) is a prefabricated corrugated steel layer, each layer of corrugated steel (1) comprises a plurality of spliced ​​corrugated steel plates, the crests and troughs of the upper and lower layers of corrugated steel (1) are arranged relative to or staggered, a plurality of UHPC stiffening ribs (3) are arranged between the two layers of corrugated steel (1), the UHPC stiffening ribs (3) are prefabricated UHPC stiffening ribs, the UHPC stiffening ribs (3) comprise at least one UHPC stiffening rib unit, the shape of each UHPC stiffening rib unit matches the shape between the two layers of corrugated steel (1), and the space or gap between the two layers of corrugated steel (1) except the UHPC stiffening ribs (3) is filled with lightweight filler; A plurality of interlayer supports (4) are provided on the corrugated steel layer (1) between two adjacent UHPC stiffening ribs (3), and the interlayer supports (4) are evenly distributed along the arched extension direction of the corrugated steel layer (1); The interlayer support (4) is an X-shaped bracket, and the ends of the X-shaped bracket are connected to the upper and lower corrugated steel layers (1) via high-strength bolts.

2. The construction method of a prefabricated double-layer corrugated steel-UHPC stiffening rib composite structure according to claim 1, characterized in that: The corrugated steel layer (1) comprises a plurality of corrugated steel plates connected by high-strength bolts, and a waterproof pad (6) is provided between the nuts of the high-strength bolts and the corrugated steel layer (1).

3. The construction method of the assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to claim 2, characterized in that: Both ends of the bottom of the X-shaped bracket are arranged at the trough of the corrugated steel layer (1), and the intersection of the X-shaped bracket is located above the crest of the lower corrugated steel layer (1).

4. The construction method of the assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to claim 3 is characterized by: The embedded part (5) is an embedded anchor bolt, both ends of which penetrate two layers of corrugated steel (1) and are fixed by nuts, and a waterproof pad (6) is provided between the nuts and the corrugated steel (1).

5. The construction method of the assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to claim 4 is characterized by: The embedded anchor bolts are evenly distributed at the crests or troughs of the two corrugated steel layers (1).

6. The construction method of the assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to claim 5, characterized in that: The lightweight filler can be a flame retardant foaming agent, lightweight concrete or rock wool.

7. The construction method of the assembled double-layer corrugated steel-UHPC stiffening rib composite structure according to claim 6, characterized in that: The shape of each UHPC stiffener unit matches the shape between two adjacent wave crests or two adjacent wave troughs.

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