A spatial truss concrete composite arch shell structure and construction method thereof

Abstract

The invention discloses a space truss concrete composite arch shell structure and a construction method thereof, which relates to the technical field of roof construction, including a space steel truss, an upper concrete slab is fixed on the upper end of the space steel truss, and a lower concrete slab is fixed on the lower end of the space steel truss; the upper concrete slab includes an upper grid precast concrete slab and an upper grid cast-in-place slab belt, and the upper grid cast-in-place slab belt is cast around the upper grid precast concrete slab; the lower concrete slab has the same structure as the upper concrete slab; the space steel truss includes an upper chord grid layer and a lower chord grid layer, the upper chord grid layer includes an upper chord assembly, the lower chord grid layer includes a lower chord assembly, and the upper chord grid layer and the lower chord grid layer are connected by a web bar; the upper chord assembly includes an upper chord rectangular steel pipe, and upper chord horizontal support plates are respectively fixed on both sides of the upper chord rectangular steel pipe, and an upper chord stiffening ear plate is provided on the upper chord horizontal support plate; the lower chord assembly has the same structure as the upper chord assembly. The invention has a large span, and has good fire resistance and corrosion resistance.

Description

Technical Field

[0001] The invention relates to the technical field of roof construction, and in particular to a space truss concrete combined arch shell structure and a construction method thereof. Background Art

[0002] The truss structure is a structural form with a long history. The ancient Romans used trusses to build the Tregen Bridge across the Danube. During the Renaissance, Italian architects (Palladio) also began to use wooden trusses to build bridges. With the continuous growth of steel production, steel trusses are being used more and more widely. A large number of steel trusses are used in public buildings such as industrial plants, exhibition halls, and gymnasiums. The main characteristics of the truss structure are light weight, reasonable force, and large spans, which make it have a very broad application space in the field of structure. However, the spatial steel truss structure also has its shortcomings. The structure is mainly used for light-loaded roofs. For heavy-loaded roofs, it shows large deformation and poor economy. In addition, the steel structure has poor corrosion resistance and fire resistance. It needs to be painted with corresponding fire-proof and anti-corrosion coatings and needs regular maintenance during the use stage. The maintenance cost of the structure is high throughout its life cycle.

[0003] The concrete shell structure is a structural form with a long history. When faced with heavy loads, corrosive environments, high fire protection requirements, and moderate spans, the integral cast-in-place reinforced concrete dome still has advantages, but its span is still not comparable to that of the steel structure dome. The reinforced concrete dome structure was developed in my country in the late 1950s and early 1960s. At that time, some medium-span spherical concrete shell structures were built (such as the dome structure of the Beijing Railway Station Hall). A lot of effort was invested in theoretical research and corresponding design regulations were formulated. With the development of lightweight roof materials and the widespread application of high-strength steel, the structural span is getting larger and larger, which limits the application of concrete domes. The large-span integral cast concrete shell will show problems of long-term cracking and reduced stiffness. In addition, the curved concrete formwork cannot be reused and the casting requires full-hall scaffolding, which leads to high construction measures and long construction periods.

[0004] Therefore, the art is in urgent need of a novel spatial truss concrete composite arch shell structure and a construction method thereof to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a spatial truss concrete composite arch shell structure and a construction method thereof, so as to solve the problems existing in the above-mentioned prior art. By combining the steel truss and the concrete shell, it is possible to realize large-span construction and also has good fire and corrosion resistance.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention discloses a space truss concrete combined arch shell structure, comprising a space steel truss, an upper concrete slab is fixed to the upper end of the space steel truss, and a lower concrete slab is fixed to the lower end of the space steel truss;

[0008] The upper concrete slab comprises an upper grid precast concrete slab and an upper grid cast-in-place slab belt, and the upper grid cast-in-place slab belt is cast around the upper grid precast concrete slab; the lower concrete slab comprises a lower grid precast concrete slab and a lower grid cast-in-place slab belt, and the lower grid cast-in-place slab belt is cast around the lower grid precast concrete slab;

[0009] The spatial steel truss comprises an upper chord grid layer and a lower chord grid layer, wherein the upper chord grid layer comprises a plurality of upper chord components, and the lower chord grid layer comprises a plurality of lower chord components, and the upper chord grid layer and the lower chord grid layer are connected via a plurality of web bars;

[0010] The upper chord component includes an upper chord rectangular steel pipe, and an upper chord horizontal support plate is respectively fixed on both sides of the lower end of the upper chord rectangular steel pipe, and a plurality of upper chord stiffening ear plates are arranged on the upper chord horizontal support plate at intervals; the lower chord component includes a lower chord rectangular steel pipe, and a lower chord horizontal support plate is respectively fixed on both sides of the lower end of the lower chord rectangular steel pipe, and a plurality of lower chord stiffening ear plates are arranged on the lower chord horizontal support plate at intervals.

[0011] Preferably, the shape of the spatial steel truss is a sphere, a cylinder, a hyperbolic parabola or an elliptical parabola.

[0012] Preferably, the webs are all rectangular tubes or circular tubes.

[0013] Preferably, the upper grid precast concrete slab comprises an upper steel bar truss formwork, and the center of the upper steel bar truss formwork is poured with an upper precast concrete;

[0014] The lower grid precast concrete slab comprises a lower steel bar truss formwork, and the center of the lower steel bar truss formwork is poured with lower precast concrete.

[0015] Preferably, the width of the upper grid cast-in-place slab and the lower grid cast-in-place slab is 300-500 mm.

[0016] Preferably, the upper chord horizontal support plate is connected to the upper concrete slab via upper chord shear bolts; and the lower chord horizontal support plate is connected to the lower concrete slab via lower chord shear bolts.

[0017] The present invention also discloses a method for constructing a spatial truss concrete composite arch shell structure, comprising the following steps:

[0018] S1. Process the upper chord assembly, lower chord assembly and belly rod in the factory;

[0019] S2. Prefabricate the upper grid precast concrete slab and the lower grid precast concrete slab in the factory;

[0020] S3. Assemble the spatial steel truss at the construction site;

[0021] S4, installing the lower grid precast concrete slab in the grid of the lower chord assembly;

[0022] S5, pouring the lower layer grid cast-in-place slab;

[0023] S6. When the strength of the cast-in-place slab of the lower grid reaches 75%, the precast concrete slab of the upper grid is installed in the grid of the upper chord assembly;

[0024] S7, pouring the cast-in-place slab strip of the upper zone grid; thus completing the entire construction process.

[0025] Compared with the prior art, the present invention has achieved the following technical effects:

[0026] The present invention combines steel and concrete by embedding the upper concrete slab and the lower concrete slab into the upper chord grid layer and the lower chord grid layer respectively, thereby forming a space truss concrete composite arch shell structure. In terms of force performance, the advantages of the excellent compression resistance of concrete and the good bending resistance of the space steel truss structure are fully utilized, and the bearing capacity and stability are greatly improved.

[0027] In terms of construction, the present invention uses a spatial steel truss as a support system for the upper concrete slab and the lower concrete slab, and does not require the construction of scaffolding or other temporary construction support systems, thereby having the advantages of convenient construction and short construction period.

[0028] In terms of structural durability, the upper concrete slab and the lower concrete slab of the present invention can be used as protection measures for the spatial steel trusses, greatly improving the corrosion resistance and fire resistance of the steel structure. At the same time, the discrete upper concrete slab and the lower concrete slab separated by the upper chord grid layer and the lower chord grid layer can effectively solve the problem of long-term shrinkage and cracking of large-volume concrete, effectively reduce the temperature stress of concrete, and ensure that the structure can be used in engineering projects with larger spans. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the overall structure of the spatial truss concrete composite arch shell structure of Example 1;

[0031] Figure 2 It is a partial schematic diagram of the spatial truss concrete composite arch shell structure of Example 1;

[0032] Figure 3 It is a partial exploded view of the spatial truss concrete composite arch shell structure of Example 1;

[0033] Figure 4 It is a partial enlarged view of the lower chord connection assembly in the spatial truss concrete composite arch shell structure of Example 1;

[0034] In the figure: 1-spatial steel truss; 2-lower concrete slab; 3-lower grid precast concrete slab; 4-lower grid cast-in-place slab strip; 5-upper concrete slab; 6-upper grid precast concrete slab; 7-upper grid cast-in-place slab strip; 1a-lower chord assembly; 1b-upper chord assembly; 1c-web member; 3a-lower steel truss formwork; 3b-lower precast concrete; 6a-upper steel truss formwork; 6b-upper precast concrete; 8a-lower chord rectangular steel pipe; 8b-lower chord horizontal support plate; 8c-lower chord stiffening ear plate; 8d-lower chord shear stud; 9a-upper chord rectangular steel pipe; 9b-upper chord horizontal support plate; 9c-upper chord stiffening ear plate; 9d-upper chord shear stud. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The purpose of the present invention is to provide a spatial truss concrete composite arch shell structure and a construction method thereof, so as to solve the problems existing in the above-mentioned prior art. By combining the steel truss and the concrete shell, it is possible to realize large-span construction and also has good fire and corrosion resistance.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] like Figure 1-Figure 4 As shown, this embodiment provides a spatial truss-concrete composite arch shell structure, including a spatial steel truss 1, an upper concrete slab 5 is fixed to the upper end of the spatial steel truss 1, and a lower concrete slab 2 is fixed to the lower end of the spatial steel truss 1.

[0040] The upper concrete slab 5 includes an upper grid precast concrete slab 6 and an upper grid cast-in-place slab strip 7, and the upper grid cast-in-place slab strip 7 is cast on-site at the construction site around the upper grid precast concrete slab 6. Similarly, the lower concrete slab 2 includes a lower grid precast concrete slab 3 and a lower grid cast-in-place slab strip 4, and the lower grid cast-in-place slab strip 4 is cast on-site at the construction site around the lower grid precast concrete slab 3.

[0041] The spatial steel truss 1 includes an upper chord grid layer and a lower chord grid layer, wherein the upper chord grid layer includes a plurality of upper chord components 1b, and the plurality of upper chord components 1b are arranged in a horizontal and vertical staggered manner. Similarly, the lower chord grid layer includes a plurality of lower chord components 1a, and the plurality of lower chord components 1a are also arranged in a horizontal and vertical staggered manner. The upper chord grid layer and the lower chord grid layer are connected by a plurality of web members 1c, i.e., the upper and lower ends of the web members 1c are respectively fixed to the upper chord component 1b and the lower chord component 1a.

[0042] Further, such as Figure 2-Figure 3 As shown, the spatial steel truss 1 can be regarded as being formed by welding a plurality of steel truss units end to end in sequence. In this embodiment, each steel truss unit is an approximate rectangular frame. Of course, in other embodiments, frames of other shapes can also be used. The upper chord grid layer at the upper end is a rectangular shape surrounded by four upper chord components 1b, and the lower chord grid layer at the lower end is a rectangular shape surrounded by four lower chord components 1a. The upper chord grid layer and the lower chord grid layer are welded and fixed by a plurality of inclined web bars 1c.

[0043] Furthermore, each steel truss unit in the spatial steel truss 1 can be unidirectionally distributed or bidirectionally distributed. The spatial steel truss 1 in this embodiment is an arc-shaped structure, so each steel truss unit is bidirectionally distributed, including annular and radial distributions, and each steel truss unit is welded and fixed. The unidirectional distribution is that multiple steel truss units are fixed in sequence along a straight line.

[0044] like Figure 4As shown, the upper chord component 1b includes an upper chord rectangular steel tube 9a, and an upper chord horizontal support plate 9b is fixed on both sides of the lower end of the upper chord rectangular steel tube 9a, and a plurality of upper chord stiffening ear plates 9c are arranged on the upper chord horizontal support plate 9b at intervals. The upper chord stiffening ear plates 9c are vertically arranged with the upper chord horizontal support plate 9b to improve the vertical strength of the upper chord horizontal support plate 9b. The cross-section of the upper chord component 1b looks like a "convex" structure, and the upper chord rectangular steel tube 9a, the upper chord horizontal support plate 9b and the upper chord stiffening ear plates 9c are manufactured as a whole by welding. Similarly, the lower chord component 1a includes a lower chord rectangular steel tube 8a, and a lower chord horizontal support plate 8b is fixed on both sides of the lower end of the lower chord rectangular steel tube 8a, and a plurality of lower chord stiffening ear plates 8c are arranged on the lower chord horizontal support plate 8b at intervals, so that the cross-section of the lower chord component 1a looks similar to a "convex" structure, and the lower chord rectangular steel tube 8a, the lower chord horizontal support plate 8b and the lower chord stiffening ear plate 8c are also manufactured as an integral body by welding.

[0045] In actual use, the present invention combines steel and concrete by embedding the upper concrete slab 5 and the lower concrete slab 2 into the upper chord grid layer and the lower chord grid layer respectively, thereby forming a space truss concrete composite arch shell structure. In terms of force performance, the advantages of the excellent compressive performance of concrete and the good bending performance of the space steel truss 1 structure are fully utilized, and the bearing capacity and stability are greatly improved. In addition, the upper concrete slab 5 and the lower concrete slab 2 can be used as protective measures for the space steel truss 1, greatly improving the corrosion resistance and fire resistance of the steel structure.

[0046] In this embodiment, the shape of the spatial steel truss 1 can be one of a sphere, a cylinder, a hyperbolic parabola or an elliptical parabola. Figure 1 Of course, the shapes of the upper concrete slab 5 and the lower concrete slab 2 also change in coordination with the shape of the spatial steel truss 1 .

[0047] In this embodiment, the web 1c is any one of a rectangular tube or a circular tube. Figure 2-Figure 3 The web member 1c in the embodiment is a rectangular tube, and the web member 1c is arranged obliquely.

[0048] In this embodiment, if Figure 2-Figure 4As shown, the upper grid precast concrete slab 6 includes an upper steel bar truss template 6a, and the upper steel bar truss template 6a includes a bottom steel plate and a steel cage assembly installed on the bottom steel plate. These are all existing technologies, so they will not be described in detail here. Further, a rectangular upper precast concrete 6b is poured in the center of the upper steel bar truss template 6a. During actual installation, the bottom steel plate in the upper steel bar truss template 6a should be flush with the upper chord horizontal support plate 9b, and the edge of the steel cage assembly in the upper steel bar truss template 6a should be located on the upper surface of the upper chord horizontal support plate 9b. Similarly, the lower grid precast concrete slab 3 includes a lower steel bar truss template 3a, and the lower steel bar truss template 3a also includes a bottom steel plate and a steel cage assembly installed on the bottom steel plate, and a rectangular lower precast concrete 3b is also poured in the center of the lower steel bar truss template 3a. During actual installation, the bottom steel plate in the lower steel truss formwork 3a should be flush with the lower chord horizontal support plate 8b, and the edge of the steel cage assembly in the lower steel truss formwork 3a should be located on the upper surface of the lower chord horizontal support plate 8b.

[0049] In this embodiment, the width of the upper grid cast-in-place slab strip 7 and the lower grid cast-in-place slab strip 4 is 300-500 mm, and the specific width can be selected according to actual needs.

[0050] In this embodiment, the upper chord horizontal support plate 9b is connected to the upper concrete slab 5 through the upper chord shear bolts 9d; the lower chord horizontal support plate 8b is connected to the lower concrete slab 2 through the lower chord shear bolts 8d.

[0051] Specifically, in the actual installation process, the lower surface of the upper steel truss template 6a (the bottom steel plate therein) is directly placed on the upper end of the upper chord horizontal support plate 9b in the corresponding upper chord assembly 1b, and then the bottom steel plate in the upper steel truss template 6a is fixed to the upper chord horizontal support plate 9b through the upper chord shear bolts 9d. Similarly, the lower surface of the lower steel truss template 3a (the bottom steel plate therein) is directly placed on the upper end of the lower chord horizontal support plate 8b in the corresponding lower chord assembly 1a, and then the bottom steel plate in the lower steel truss template 3a is fixed to the lower chord horizontal support plate 8b through the lower chord shear bolts 8d.

[0052] Embodiment 2

[0053] This embodiment provides a method for constructing a space truss concrete composite arch shell structure, which is used to construct the space truss concrete composite arch shell structure in Embodiment 1, and includes the following steps:

[0054] S1. Process the upper chord assembly 1b, the lower chord assembly 1a and the web member 1c separately in the factory.

[0055] S2. Prefabricate the upper grid precast concrete slab 6 and the lower grid precast concrete slab 3 in the factory.

[0056] S3. The spatial steel truss 1 is assembled at the construction site, and the various components are welded and fixed.

[0057] S4, installing the lower grid precast concrete slab 3 in the grid of the lower chord assembly 1a, and fixing it with the lower chord shear bolts 8d.

[0058] S5. Cast the lower zone cast-in-place slab strip 4.

[0059] S6. When the strength of the cast-in-place slab 4 of the lower grid reaches 75%, the precast concrete slab 6 of the upper grid is installed in the grid of the upper chord assembly 1b and fixed by the upper chord shear bolts 9d.

[0060] S7, pouring the upper zone cast-in-place slab strip 7; thereby completing the entire construction process.

[0061] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A spatial truss concrete composite arch shell structure, characterized in that: It comprises a spatial steel truss, an upper concrete slab is fixed to the upper end of the spatial steel truss, and a lower concrete slab is fixed to the lower end of the spatial steel truss; The upper concrete slab comprises an upper grid precast concrete slab and an upper grid cast-in-place slab belt, and the upper grid cast-in-place slab belt is cast around the upper grid precast concrete slab; the lower concrete slab comprises a lower grid precast concrete slab and a lower grid cast-in-place slab belt, and the lower grid cast-in-place slab belt is cast around the lower grid precast concrete slab; The spatial steel truss comprises an upper chord grid layer and a lower chord grid layer, wherein the upper chord grid layer comprises a plurality of upper chord components, and the lower chord grid layer comprises a plurality of lower chord components, and the upper chord grid layer and the lower chord grid layer are connected via a plurality of web bars; The upper chord component includes an upper chord rectangular steel pipe, and an upper chord horizontal support plate is respectively fixed on both sides of the lower end of the upper chord rectangular steel pipe, and a plurality of upper chord stiffening ear plates are arranged on the upper chord horizontal support plate at intervals; the lower chord component includes a lower chord rectangular steel pipe, and a lower chord horizontal support plate is respectively fixed on both sides of the lower end of the lower chord rectangular steel pipe, and a plurality of lower chord stiffening ear plates are arranged on the lower chord horizontal support plate at intervals.

2. The spatial truss concrete composite arch shell structure according to claim 1 is characterized in that: The shape of the spatial steel truss is a sphere, a cylinder, a hyperbolic parabola or an elliptical parabola.

3. The spatial truss concrete composite arch shell structure according to claim 1 is characterized in that: The webs are all rectangular tubes or circular tubes.

4. The spatial truss concrete composite arch shell structure according to claim 1 is characterized in that: The upper grid precast concrete slab comprises an upper steel bar truss formwork, and the center of the upper steel bar truss formwork is poured with an upper precast concrete; The lower grid precast concrete slab comprises a lower steel bar truss formwork, and the center of the lower steel bar truss formwork is poured with lower precast concrete.

5. The spatial truss concrete composite arch shell structure according to claim 1 is characterized in that: The width of the upper grid cast-in-place slab and the lower grid cast-in-place slab is 300-500 mm.

6. The spatial truss concrete composite arch shell structure according to claim 1 is characterized in that: The upper chord horizontal support plate is connected to the upper concrete slab via the upper chord anti-shear bolts; the lower chord horizontal support plate is connected to the lower concrete slab via the lower chord anti-shear bolts.

7. A method for constructing a spatial truss concrete composite arch shell structure, used to construct the spatial truss concrete composite arch shell structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Process the upper chord assembly, lower chord assembly and belly rod in the factory; S2. Prefabricate the upper grid precast concrete slab and the lower grid precast concrete slab in the factory; S3. Assemble the spatial steel truss at the construction site; S4, installing the lower grid precast concrete slab in the grid of the lower chord assembly; S5, pouring the cast-in-place slab strip in the lower grid; S6. When the strength of the cast-in-place slab of the lower grid reaches 75%, the precast concrete slab of the upper grid is installed in the grid of the upper chord assembly; S7, pouring the cast-in-place slab strip of the upper zone grid; thus completing the entire construction process.

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