Double-helix structure system and construction method

Abstract

The invention belongs to the technical field of building construction, and discloses a double-helix structure system and a construction method.The double-helix structure system comprises a core column, a first inner spiral body, a second inner spiral body, a first outer spiral body and a second outer spiral body, and the first inner spiral body and the second inner spiral body adopt curved concrete thick shells; the first inner spiral body and the second inner spiral body are both connected with the core column and spirally ascend to the top of the core column from the two opposite sides of the bottom of the core column. The first outer spiral body is rigidly connected with the overhanging end of the first inner spiral body, the first outer spiral body comprises a plurality of overhanging prefabricated UHPC beams, and the adjacent overhanging prefabricated UHPC beams are connected through split bolts and form steps; the second outer spiral body is in rigid connection with the overhanging end of the second inner spiral body, the orthographic projection of the second outer spiral body in the ground direction is larger than that of the first outer spiral body in the ground direction, the second outer spiral body is of a steel frame structure, and the steel frame structure is provided with a supporting column supported on the ground.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a double helix structure system and a construction method. Background Art

[0002] The spiral structure system has been gradually widely used in large domestic public buildings, staircase buildings and other fields due to its beautiful shape and large building space. The double spiral structure system is mainly designed around a single column. The two spiral structures with large spans on the periphery rise from both sides of the bottom of the column to the top of the column, forming a cantilever structure as a whole.

[0003] The traditional central column spiral structure system is usually divided into two structural forms: twisted plate type and twisted beam type. The twisted plate type means that the entire staircase is composed of spiral steps, and its plane projection is usually arc-shaped or elliptical. This form is common in public buildings and industrial buildings, such as spiral steel staircases; twisted beam spiral staircases mostly use steel structures, mainly because steel structures have the advantages of high strength, light weight, good overall stiffness, strong deformation ability and good ability to withstand dynamic loads.

[0004] These two types of spiral structures are subject to the combined effects of bending, shear, torsion and axial force, and have complex forces, short force transmission paths and small span ranges. Therefore, they are mostly used in spiral staircases with smaller cantilevers and cannot be used in spiral structure systems with ultra-large spans in large public buildings. Summary of the invention

[0005] The purpose of the present invention is to provide a double helix structure system to solve the problem that the short force transmission path leads to a small span range and cannot be applied to large public buildings.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A double helix structure system comprises a core column, a first inner helix, a second inner helix, a first outer helix and a second outer helix, wherein the first inner helix and the second inner helix are formed of a curved concrete thick shell, both of which are connected to the core column and spirally rise from opposite sides of the bottom of the core column to the top of the core column; the first outer helix is ​​rigidly connected to the cantilevered end of the first inner helix, and the first outer helix comprises a plurality of cantilevered prefabricated UHPC beams, and adjacent cantilevered prefabricated UHPC beams are connected by tension bolts to form a step; the second outer helix is ​​rigidly connected to the cantilevered end of the second inner helix, and the orthographic projection of the second outer helix to the ground is greater than the orthographic projection of the first outer helix to the ground, the second outer helix is ​​formed of a steel frame structure, and the second outer helix has a support column supported on the ground.

[0008] Optionally, the core column includes an inner tube and an outer tube, the outer tube is located outside the inner tube, and a concrete layer is provided between the inner tube and the outer tube and outside the outer tube.

[0009] Optionally, the inner tube includes a plurality of first tubular segments connected axially in sequence, the outer tube includes a shear-resistant portion and a plurality of second tubular segments connected axially in sequence, the shear-resistant portion includes a plurality of T-shaped steels arranged inside and outside of the second tubular segments; adjacent second tubular segments are connected via a patching section, the patching section includes T-shaped steels arranged inside and outside of the second tubular segment and welded one-to-one with the T-shaped steels in the shear-resistant portion.

[0010] Optionally, the first inner helix and the second inner helix are symmetrically arranged, and the thickness of the first inner helix and the second inner helix decreases from bottom to top.

[0011] Optionally, the second outer spiral also includes annular steel beams and radial steel beams, the annular steel beams are arranged in two circles from the inside to the outside, the radial steel beams connect the two circles of the annular steel beams and the second inner spiral body, and a plurality of the radial steel beams are arranged at intervals along the circumferential spiral of the second inner spiral body.

[0012] A construction method for constructing any of the above-mentioned double helix structure systems, the construction method comprising the following steps:

[0013] S1, constructing the core column;

[0014] S2, casting the first inner helical body and the second inner helical body in situ;

[0015] S3, constructing the first outer spiral;

[0016] S4, constructing the second outer helical body.

[0017] Optionally, when constructing the first inner spiral body and the second inner spiral body, a temporary support system combining a steel structure platform and a fastener-type support frame is provided at the bottom of the first inner spiral body and the second inner spiral body.

[0018] Optionally, when constructing the first outer spiral, a temporary support system combining a steel structure platform and a fastener-type support frame is used to support the cantilevered prefabricated UHPC beam.

[0019] Optionally, the core column includes an inner cylinder and an outer cylinder, and the inner cylinder and the outer cylinder are installed in sections and staggered.

[0020] Optionally, the first inner spiral body and the second inner spiral body are constructed using double-sided formwork, and the double-sided formwork includes a bottom formwork and a surface formwork, wherein the bottom formwork uses a small wooden formwork to simulate a curved surface, and the surface formwork uses a customized GFRP curved surface formwork.

[0021] Beneficial effects of the present invention:

[0022] The above-mentioned double helix structure system is composed of core columns + inner double helix + outer double helix to form a structurally stable large-span double helix structure system. It innovatively adopts the structural form of high-performance concrete prefabricated components + steel frames, which can greatly increase the span range of the spiral structure system, and the overall stability and safety of the spiral structure system are higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the three-dimensional structure of the double helix structure system in an embodiment of the present invention;

[0024] Figure 2 is a bottom view of a double helix structure system in an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the three-dimensional structure of the first inner helix, the second inner helix and the core column in an embodiment of the present invention;

[0026] Figure 4 is a top view of the first inner helix, the second inner helix and the core column in an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the connection structure of the first outer helical body and the first inner helical body in an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of the connection structure of the second outer helical body and the second inner helical body in an embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the construction of the core column in the embodiment of the present invention;

[0030] Figure 8 is a top view of a core column in an embodiment of the present invention;

[0031] Fig. 9 It is a schematic diagram of the construction of the first outer helicoid in an embodiment of the present invention.

[0032] In the figure:

[0033] 1. Core column; 11. Inner tube; 111. First pipe column section; 12. Outer tube; 121. Second pipe column section; 122. Inlay section; 123. Shear resistant part; 2. First inner spiral; 3. Second inner spiral; 4. First outer spiral; 41. Cantilever precast UHPC beam; 42. Cast-in-place concrete section; 43. Tension bolts; 5. Second outer spiral; 51. Circumferential steel beam; 52. Radial steel beam; 53. Support column; 6. Inner tube operating platform; 7. Outer tube operating platform. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] refer to Figure 1-Figure 9As shown, a double helix structure system is proposed in this embodiment, including a core column 1, a first inner helix 2, a second inner helix 3, a first outer helix 4 and a second outer helix 5, wherein the first inner helix 2 and the second inner helix 3 are both cast-in-place curved concrete thick shells, and the first inner helix 2 and the second inner helix 3 spirally rise from the opposite sides of the bottom of the core column 1 to the top of the core column 1; the first outer helix 4 is rigidly connected to the cantilevered end of the first inner helix 2, and the first outer helix 4 includes a plurality of cantilevered prefabricated UHPC beams 41 (UHPC refers to Ultra-High Performance Concrete), and one end of the cantilevered prefabricated UHPC beam 41 connected to the first inner helix 2 is provided with post-tensioned prestressed steel bars, which are anchored in the first inner helix 2 and tensioned to form a rigid connection. Adjacent cantilevered prefabricated UHPC beams 41 are connected by tension bolts 43 to form steps, and adjacent cantilevered UHPC prefabricated beams are also connected by cast-in-place concrete sections 42 to improve the structural strength of the first outer spiral 4. The second outer spiral 5 is rigidly connected to the cantilevered end of the second inner spiral 3. The second outer spiral 5 adopts a steel frame structure. The second outer spiral 5 has a support column 53 supported on the ground, and the orthographic projection of the second outer spiral 5 to the ground is greater than the orthographic projection of the first outer spiral 4 to the ground.

[0039] The double helix structure system is composed of a core column 1, an inner double helix and an outer double helix, forming a structurally stable large-span double helix structure system. It innovatively adopts a structural form of high-performance concrete prefabricated components + steel frame, wherein the core column 1 and the first inner helix 2 and the second inner helix 3 are cast in situ to form a structure with ultra-high rigidity, which bears the combined effects of the bending, shear, torsion and axial force of the entire first outer helix 4 and the second outer helix 5, and the compressive strength of the cantilever prefabricated UHPC beam 41 reaches 165MPa, which greatly increases the span range of the spiral structure system and improves the overall stability of the spiral structure system.

[0040] refer to Figure 7 As shown, the core column 1 includes an inner tube 11 and an outer tube 12 coaxially spaced apart, the outer tube 12 is sleeved outside the inner tube 11, and a concrete layer is poured between the inner tube 11 and the outer tube 12 and outside the outer tube 12.

[0041] Specifically, in order to reduce the construction difficulty of the core column 1, the inner tube 11 includes a plurality of first pipe string sections 111 connected in sequence along the axial direction, and the outer tube 12 includes a plurality of second pipe string sections 121 connected in sequence along the axial direction. Both the first pipe string section 111 and the second pipe string section 121 are steel pipe columns. At the same time, in order to improve the shear resistance of the core column 1, the outer tube 12 also includes a shear resistance part 123, which includes a plurality of T-shaped steels arranged inside and outside the second pipe string section 121.

[0042] In order to provide installation accuracy, the outer cylinder 12 also includes a patching section 122, which includes a plurality of T-shaped steels arranged around the inside and outside of the second pipe string section 121 and welded one-to-one with the T-shaped steels in the shearing part 123 and anchored with the concrete layer, and the two ends of the length of the T-shaped steel of the patching section 122 are respectively welded to the shearing parts 123 on the two adjacent second pipe string sections 121. It can be understood that the length of the shearing part is less than the length of the second pipe string section 121 to provide space for the installation of the patching section 122.

[0043] It should be emphasized that connecting steel bars for connecting the steel bars frames in the first inner spiral 2 and the second inner spiral 3 are inserted into the outer tube 12. It can be understood that the connecting steel bars can be set on the second steel pipe column or on the T-shaped steel.

[0044] In this embodiment, the first inner spiral 2 and the second inner spiral 3 are symmetrically arranged, and the thickness of the first inner spiral 2 and the second inner spiral 3 decreases from bottom to top to lower the center of gravity of the first inner spiral 2 and the second inner spiral 3, and the slope of the first inner spiral 2 and the second inner spiral 3 on the side close to the core column 1 is greater than the slope on the side away from the core column 1.

[0045] refer to Figure 1 and 2 As shown, the second outer spiral body 5 also includes an annular steel beam 51 and a radial steel beam 52, wherein the annular steel beam 51 is arranged in two circles from the inside to the outside, and the radial steel beam 52 connects the two circles of annular steel beam 51 and the second inner spiral body 3, and multiple radial steel beams 52 are arranged at intervals along the circumferential spiral of the second inner spiral body 3.

[0046] This embodiment also proposes a construction method for constructing the above double helix structure system, and the construction method mainly includes the following steps:

[0047] S1. Construct the core column 1. The inner tube 11 and the outer tube 12 of the core column 1 are installed in a "staggered segmentation with height difference" manner, and the inner tube 11 and the outer tube 12 are synchronously and staggeredly constructed. The segmentation surface of the inner tube 11 is higher than the segmentation surface of the outer tube 12, and the concrete layer inside and outside the outer tube 12 is poured synchronously to ensure that the pouring is dense and the quality is controllable. When installing the inner tube 11 and the outer tube 12, the inner tube 11 and the outer tube 12 correspond to the inner tube operating platform 6 and the outer tube operating platform 7 respectively, wherein the inner tube operating platform 6 is fixed on the outer surface of the inner tube 11, and the outer tube operating platform 7 is fixed on the outer surface of the outer tube 12.

[0048] S2, cast-in-place first inner spiral 2 and second inner spiral 3. Since the slope of the concrete thick shell curved surface of the first inner spiral 2 and the second inner spiral 3 changes gradually, and the slope close to the core column 1 is larger, double-sided formwork is required for construction. The double-sided formwork includes a bottom formwork and a surface formwork, wherein the bottom formwork uses a small wooden formwork to simulate the curved surface, and the surface formwork uses a customized GFRP curved surface formwork. For the thicker part (bottom) of the first inner spiral 2 and the second inner spiral 3, a temporary support system combining a steel structure platform and a fastener-type support frame is used at the bottom of the bottom formwork to improve construction efficiency and ensure casting safety.

[0049] S3, construct the first outer spiral 4. Hoist the cantilever UHPC precast beam to the target height, set the tensioning end of the post-tensioned prestressed steel bar set inside the cantilever UHPC precast beam on the first inner spiral 2 to complete the tensioning. During the construction of the first outer spiral 4, a temporary support system combining a steel structure platform and a fastener-type support frame is also set at the bottom of the first outer spiral 4, and the arching accuracy of the first outer spiral 4 is controlled according to calculations. Adjacent cantilever UHPC precast beams are connected by tension bolts 43 and cast-in-place concrete sections 42.

[0050] It should be noted that when setting up the temporary support system, a nonlinear construction phase process analysis is carried out on the temporary support system to ensure the safety of the frame structure; at the same time, based on the curved surface shapes of the first inner spiral 2 and the second inner spiral 3, the arrangement principles of the fastener-type support frame are determined to ensure the feasibility of the curved surface construction of the first inner spiral 2 and the second inner spiral 3.

[0051] S4, construct the second outer spiral 5. During construction, the annular steel beam 51 is constructed first, and the radial steel beam 52 is constructed after the annular steel beam 51 is finally fixed. It should be noted that when constructing the annular steel beam 51, a temporary support is set below the annular steel beam 51 to adjust the elevation, thereby controlling the spiral ascent accuracy of the second outer spiral 5. The starting and ending points of the annular steel beam 51 are both on the same straight line as the starting and ending points of the second inner spiral 3.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A double helix structure system, characterized in that: The double helix structure system comprises: Core column (1); A first inner spiral (2) and a second inner spiral (3), wherein the first inner spiral (2) and the second inner spiral (3) are made of a curved concrete thick shell, and the first inner spiral (2) and the second inner spiral (3) are both connected to the core column (1), and spirally rise from opposite sides of the bottom of the core column (1) to the top of the core column (1); A first outer spiral (4), wherein the first outer spiral (4) is rigidly connected to the cantilevered end of the first inner spiral (2), and the first outer spiral (4) comprises a plurality of cantilevered prefabricated UHPC beams (41), and adjacent cantilevered prefabricated UHPC beams (41) are connected by tension bolts (43) to form a step; The second outer spiral (5) is rigidly connected to the cantilevered end of the second inner spiral (3), and the orthographic projection of the second outer spiral (5) to the ground is larger than the orthographic projection of the first outer spiral (4) to the ground. The second outer spiral (5) adopts a steel frame structure, and the second outer spiral (5) has a support column (53) supported on the ground.

2. The double helix structure system according to claim 1, characterized in that: The core column (1) comprises an inner tube (11) and an outer tube (12), wherein the outer tube (12) is located outside the inner tube (11), and a concrete layer is provided between the inner tube (11) and the outer tube (12) and outside the outer tube (12).

3. The double helix structure system according to claim 2, characterized in that: The inner tube (11) comprises a plurality of first pipe string sections (111) connected in sequence in the axial direction, the outer tube (12) comprises a shearing portion (123) and a plurality of second pipe string sections (121) connected in sequence in the axial direction, the shearing portion (123) comprises a plurality of T-shaped steels arranged inside and outside the second pipe string sections (121); adjacent second pipe string sections (121) are connected via a patching section (122), the patching section (122) comprises T-shaped steels arranged inside and outside the second pipe string sections (121) and welded one-to-one with the T-shaped steels in the shearing portion (123).

4. The double helix structure system according to claim 1, characterized in that: The first inner helix (2) and the second inner helix (3) are symmetrically arranged, and the thickness of the first inner helix (2) and the second inner helix (3) decreases from bottom to top.

5. The double helix structure system according to claim 1, characterized in that: The second outer spiral further comprises an annular steel beam (51) and a radial steel beam (52); the annular steel beam (51) is arranged in two circles from the inside to the outside; the radial steel beam (52) connects the two circles of the annular steel beam (51) and the second inner spiral body (3); and a plurality of the radial steel beams (52) are arranged at intervals along the circumferential spiral of the second inner spiral body (3).

6. A construction method for constructing the double helix structure system according to any one of claims 1 to 5, characterized in that: The construction method comprises the following steps: S1, constructing the core column (1); S2, casting the first inner helical body (2) and the second inner helical body (3) in situ; S3, constructing the first outer helical body (4); S4, constructing the second outer helical body (5).

7. The construction method according to claim 6, characterized in that: During the construction of the first inner spiral (2) and the second inner spiral (3), a temporary support system combining a steel structure platform and a fastener-type support frame is provided at the bottom of the first inner spiral (2) and the second inner spiral (3).

8. The construction method according to claim 6, characterized in that: When constructing the first outer spiral (4), a temporary support system combining a steel structure platform and a fastener-type support frame is used to support the cantilevered prefabricated UHPC beam (41).

9. The construction method according to claim 6, characterized in that: The core column (1) comprises an inner tube (11) and an outer tube (12), and the inner tube (11) and the outer tube (12) are installed in sections and staggered.

10. The construction method according to claim 6, characterized in that: The first inner spiral body (2) and the second inner spiral body (3) are constructed using double-sided formwork, and the double-sided formwork includes a bottom formwork and a surface formwork, wherein the bottom formwork uses a small wooden formwork to simulate a curved surface, and the surface formwork uses a customized GFRP curved surface formwork.

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