CN115874748B - Construction method of reinforced concrete large-span thin shell and shell system thereof - Google Patents
Construction method of reinforced concrete large-span thin shell and shell system thereof Download PDFInfo
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- CN115874748B CN115874748B CN202211546174.9A CN202211546174A CN115874748B CN 115874748 B CN115874748 B CN 115874748B CN 202211546174 A CN202211546174 A CN 202211546174A CN 115874748 B CN115874748 B CN 115874748B
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Abstract
The invention relates to the technical field of building construction, in particular to a construction method of a reinforced concrete large-span thin shell and a shell system thereof. The construction method comprises the following steps: s1, setting up a scaffold, setting up a lower layer plate template on the scaffold, binding a lower layer shell reinforcing mesh and rib plate dowel bars above the lower layer plate template, and presetting an anti-floating embedded part; s2, pouring concrete into the lower shell reinforcing steel bar net; s3, binding rib plate reinforcing steel bars on the basis of rib plate dowel bars; s4, placing light filling blocks between adjacent rib plate dowel bars, and binding upper-layer shell reinforcing steel bar meshes; fixing the light filling blocks on a lower shell reinforcing steel bar net through an anti-floating embedded part; and S5, pouring concrete to form the separation rib plates and the upper layer concrete shell plate. The structure can solve the problems that the roof shell in the prior art cannot meet the overall building structural strength and stability requirements of the concrete flat shell with the rise height and the minimum span not more than 1/5 when the building span is large.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method of a reinforced concrete large-span thin shell and a shell system thereof.
Background
Reinforced concrete arc-shaped shells or hyperbolic flat shell structures in the prior art often cannot meet the requirements of ultra-large span reinforced concrete building thin shell roofs on shell strength.
The existing mode of building an arc-shaped shell or a hyperbolic flat shell building generally needs to build a steel pipe scaffold at high altitude, builds a support steel frame according to design requirements, and builds a shell on the support steel frame, so that a roof shell structure is formed. However, the roof shell with the existing structure can only meet the strength requirement of the small-span roof shell, cannot meet the overall building structure strength requirement of the concrete flat shell with the rise height and the minimum span not more than 1/5 when the building span is larger, and cannot solve the problem of overlarge dead weight and concentrated stress of the large-span building. For example, the prior art cannot address the large building requirements of large coverage areas such as stadiums or water sports centers where the building area is large. Therefore, there is an urgent need for those skilled in the art to solve the problem of how to construct a large span shell system under conditions that ensure the strength and structural stability of the building.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the roof shell in the prior art can only meet the strength requirement of a small-span roof shell, cannot meet the integral building structure strength requirement of a concrete flat shell with the rise height and the minimum span not more than 1/5 when the building span is larger, and the existing structure cannot solve the problems of overlarge dead weight and concentrated stress of a large-span building. Therefore, the invention provides a construction method of a reinforced concrete large-span thin shell, which comprises the following steps:
s1, building a scaffold, building a lower plate template on the scaffold, binding a lower shell reinforcing mesh and rib plate dowel bars above the lower plate template, and presetting an anti-floating embedded part;
s2, pouring concrete into the lower-layer shell reinforcing steel bar net to form a lower-layer concrete shell plate;
s3, binding rib plate reinforcing steel bars on the basis of the rib plate dowel bars;
s4, placing light filling blocks between adjacent rib plate dowel bars, and binding upper-layer shell reinforcing steel bar meshes; the light filling blocks are fixed on the lower shell reinforcing steel bar net through the anti-floating embedded parts, so that the light filling blocks are prevented from floating or deforming due to buoyancy when concrete is poured;
s5, pouring concrete to the rib plate dowel bars and the rib plate reinforcing steel bars to form separation rib plates; and pouring concrete into the upper layer shell reinforcing steel bar net to form an upper layer concrete shell plate.
Optionally, in step S4, the method further includes: a protective layer clamping piece is arranged between the rib plate dowel bar and the light filling block;
the protective layer clamping piece is used for supporting the light filling block so as to prevent the light filling block from sliding when concrete is poured in the step S5.
Optionally, the anti-floating embedded part is a steel bar;
the step S1 further includes: fixedly connecting a first hook structure at the lower end of the anti-floating embedded part with the reinforcing mesh of the lower shell;
the step S4 further includes: and fixedly connecting the second hook structure at the upper end position of the anti-floating embedded part with the light filling block.
Optionally, the construction method of the reinforced concrete large-span thin shell further comprises the following step of:
when the included angle between the upper layer concrete shell plate and the lower layer concrete shell plate and the horizontal plane is larger than 45 degrees, the lower layer plate template is a double-layer template, and a double-layer template construction method is adopted.
Optionally, step S0 is also provided before step S1,
the step S0 includes: erecting a receiving base; burying underground pile foundation and bearing Fang Dashe on pile foundation
The platform supports are connected with adjacent platform supports through pull beams; the plurality of pull beams are sequentially connected with the plurality of 5 bearing platform supports to form a closed loop; the pull beam is a prestressed reinforced concrete beam.
Optionally, in step S0, the prestress tensioning of the tensioning beam and the unloading of the support set in the construction of the roof housing are matched synchronously by setting synchronous observation equipment;
when the bearing platform support and the pull beam are used for preparing a construction upper structure after construction is completed, 30% of prestress is firstly applied to the pull beam, the rest of prestress is applied, the construction scheme of dismantling and unloading is combined with 0 support after construction of the roof shell is completed, and step tensioning is performed according to the principle of matching thrust and prestress, so that the bearing base is ensured not to change outwards.
A reinforced concrete long span thin shell system comprises
A roof housing comprising: a solid housing connection portion, a double-layered ribbed housing portion, and a housing top portion;
the double-layer ribbed housing portion includes: the concrete slab comprises an upper concrete shell plate, a lower concrete shell plate, a separation rib plate arranged 5 between the upper concrete shell plate and the lower concrete shell plate, and a light filling block and an anti-floating embedded part; the separation rib plates divide the space surrounded by the upper layer concrete shell plate and the lower layer concrete shell plate into a plurality of accommodating cavities, and the light filling blocks are filled in the accommodating cavities; the anti-floating embedded part is used for preventing the light filling block from floating or deforming due to buoyancy when concrete is poured.
0, the protective layer clamping piece is a wooden cushion block or a mortar cushion block arranged between the separation rib plate and the light filling block.
Optionally, the anti-floating embedded part is a steel bar;
a first hook structure fixedly connected with the reinforcing mesh of the lower shell is arranged at the lower end of the anti-floating embedded part;
and a second hook structure fixedly connected with the light filling block is arranged at the upper end of the anti-floating embedded part.
Optionally, the double-layer ribbed shell part is towards the roof position direction of the roof shell, and the thickness of the double-layer ribbed shell part is gradually reduced;
the thickness of the lightweight filler blocks in the double-layer ribbed housing portion in the direction of the roof position of the roof housing is gradually reduced.
Optionally, the outer edge of the solid shell connecting part is further provided with a turnover edge extending towards the direction of the receiving base so as to form a hidden arched reinforcing structure;
and the eave turning position is provided with a steel arch supporting structure and/or a concrete hidden arch structure extending along the outer contour direction of the roof shell.
The technical scheme of the invention has the following advantages:
1. the invention provides a construction method of a reinforced concrete large-span thin shell, which comprises the following steps:
s1, building a scaffold, building a lower plate template on the scaffold, binding a lower shell reinforcing mesh and rib plate dowel bars above the lower plate template, and presetting an anti-floating embedded part;
s2, pouring concrete into the lower-layer shell reinforcing steel bar net to form a lower-layer concrete shell plate;
s3, binding rib plate reinforcing steel bars on the basis of the rib plate dowel bars;
s4, placing light filling blocks between adjacent rib plate dowel bars, and binding upper-layer shell reinforcing steel bar meshes; the light filling blocks are fixed on the lower shell reinforcing steel bar net through the anti-floating embedded parts, so that the light filling blocks are prevented from floating or deforming due to buoyancy when concrete is poured;
s5, pouring concrete to the rib plate dowel bars and the rib plate reinforcing steel bars to form separation rib plates; and pouring concrete into the upper layer shell reinforcing steel bar net to form an upper layer concrete shell plate.
The existing mode of building an arc-shaped shell or a hyperbolic flat shell building generally needs to build a steel pipe scaffold at high altitude, build a support steel frame according to design requirements, and build a shell on the support steel frame so as to form a house
And a cover housing structure. However, the roof shell with the existing structure can only meet the strong 5-degree requirement of the small-span roof shell, cannot meet the overall building structural strength requirement of the concrete flat shell with the sagittal height and the minimum span not more than 1/5 when the building span is larger, and cannot solve the problem of overlarge dead weight and concentrated stress of the large-span building. In the invention, by the reinforced concrete large-span thin-shell construction method, a plurality of accommodating cavities are formed by the upper layer concrete shell plate, the lower layer concrete shell plate and the separating rib plates, and then the reinforced concrete large-span thin-shell construction method is light
The light filling blocks of the material are filled into the accommodating cavity, so that the problem that the dead weight of the large-span building is overlarge by 0 can be effectively reduced. In addition, the rib plate dowel bar and the light filling block are directly poured with concrete
So as to firmly and reliably fix the light filling blocks on the upper layer shell reinforcing steel bar net, the lower layer shell reinforcing steel bar net and the rib plate dowel bars. The construction method can effectively enable the roof shell to meet the integral building structural strength requirement of the concrete flat shell with the sagittal height and the minimum span not more than 1/5 when the building span is larger. In addition, for the purpose of solution
The problem that the weight of the light filling block is light, and the light filling block floats upwards when concrete is poured is solved. The anti-floating embedded part is further arranged in the invention 5, and can effectively fix the position of the light filling block, so that the scheme can be realized.
2. The invention provides a construction method of a reinforced concrete large-span thin shell, which comprises the following steps:
a protective layer clamping piece is arranged between the rib plate dowel bar and the light filling block;
the protective layer clamping piece is used for supporting the light filling block so as to prevent the light filling block 0 from sliding when concrete is poured in the step S5, thereby ensuring the pouring effect of the concrete.
3. According to the construction method of the reinforced concrete large-span thin shell, the anti-floating embedded part is a reinforced bar; the step S1 further includes: a first hook structure and the first hook structure for preventing the lower end of the floating embedded part from being floated
The lower shell reinforcing steel bar mesh is fixedly connected; the step S4 further includes: and fixedly connecting the second hook structure at the 5-position of the upper end of the anti-floating embedded part with the light filling block.
The anti-floating embedded part is a steel bar with a first hook structure and a second hook structure respectively arranged at the upper end and the lower end. The anti-floating embedded part can effectively fix the light filling blocks on the lower shell reinforcing steel bar net, so that the light filling blocks are simply and reliably ensured not to float upwards in the concrete pouring process.
4. The invention provides a construction method of a reinforced concrete large-span thin shell, which comprises the following steps: when the included angle between the upper layer concrete shell plate and the lower layer concrete shell plate and the horizontal plane is larger than 45 degrees, the lower layer plate template is a double-layer template, and a double-layer template construction method is adopted.
When the included angle between the upper layer concrete shell plate and the lower layer concrete shell plate and the horizontal plane is larger than 45 degrees, the construction effect can be effectively ensured by the double-layer template construction method.
5. The construction method of the reinforced concrete large-span thin shell provided by the invention further comprises a step S0 before the step S1, wherein the step S0 comprises the following steps: erecting a receiving base; embedding a pile foundation positioned underground, erecting a bearing platform support above the pile foundation, and connecting adjacent bearing platform supports through a pull beam; the plurality of pull beams are sequentially connected with the plurality of bearing platform supports to form a closed loop; the pull beam is a prestressed reinforced concrete beam.
In the invention, the pull beams are arranged between the adjacent bearing platform supports, and the plurality of the pull beams are sequentially connected with the plurality of bearing platform supports to form a closed-loop structure. The structure can form a self-balancing system, so that horizontal thrust transmitted by the steel arch supporting structure or the concrete hidden arch structure in the shell structure is offset, and the stability of the whole shell is improved.
6. The invention provides a construction method of a reinforced concrete large-span thin shell,
in step S0, the prestress tensioning of the tensioning beam and the unloading of the support set in the construction of the roof shell are matched synchronously by setting synchronous observation equipment;
when the bearing platform support and the pull beam are used for preparing a construction upper structure after construction is completed, 30% of prestress is firstly applied to the pull beam, the rest of prestress is applied, the construction scheme of combining support and dismantling and unloading is combined after construction of the roof shell is completed, and step tensioning is performed according to the principle of matching thrust and prestress, so that the bearing base is ensured not to change outwards.
In the invention, because of the characteristics of the flat shell, the roof shell is influenced by the dead weight of the flat shell, and an outward thrust is exerted on the bearing base, the thrust is firstly resisted by the horizontal bearing capacity of pile foundations at the lower parts of four bearing platform supports of the roof shell, the horizontal bearing capacity of the pile foundations is usually smaller, and when the structural span of the shell is larger, a pull beam is required to be arranged for balancing. The shell structure of the invention has huge span, and the pull beams are required to balance the thrust transmitted by the shell of the roof, and because the huge pull beams of the thrust all need to be provided with prestress to control the crack and deformation, the prestress tensioning of the pull beams and the construction of the shell roof can be matched to effectively control the thrust generated by the shell, and meanwhile, the invention can not apply all prestress to the pull beams at one time, thereby avoiding the problem of damage caused by reverse deflection of the pile foundation.
7. The invention provides a reinforced concrete large-span thin shell system, which comprises
A roof housing comprising: a solid housing connection portion, a double-layered ribbed housing portion, and a housing top portion;
the double-layer ribbed housing portion includes: the anti-floating concrete slab comprises an upper concrete shell plate, a lower concrete shell plate, a separation rib plate arranged between the upper concrete shell plate and the lower concrete shell plate, and a light filling block and an anti-floating embedded part; the separation rib plates divide the space surrounded by the upper layer concrete shell plate and the lower layer concrete shell plate into a plurality of accommodating cavities, and the light filling blocks are filled in the accommodating cavities; the anti-floating embedded part is used for preventing the light filling block from floating or deforming due to buoyancy when concrete is poured.
In the invention, the roof shell is formed by the solid shell connecting part, the double-layer ribbed shell part and the shell top, so that the stress on the upper part of the roof shell can be effectively dispersed to the solid shell connecting part at the bottom of the shell, thereby avoiding the problem of stress concentration. Through the structure, the roof shell can effectively meet the integral building structural strength requirement of the concrete flat shell with the sagittal height and the minimum span not more than 1/5 when the building span is larger. And moreover, the upper concrete shell plate, the lower concrete shell plate and the separation rib plates form a plurality of accommodating cavities, and then the light filling blocks made of light materials are filled into the accommodating cavities, so that the problem of overlarge dead weight of the large-span building can be effectively reduced.
8. The reinforced concrete large-span thin-shell system provided by the invention is characterized in that the protective layer clamping piece is a wooden cushion block or a mortar cushion block arranged between the separation rib plate and the light filling block.
According to the invention, the wooden cushion blocks or the mortar cushion blocks can effectively prevent the light filling blocks from sliding in position when concrete is poured in the step S5, so that the pouring effect of the concrete is ensured. In addition, the wooden cushion block or the mortar cushion block has the advantage of low production and use cost.
9. According to the reinforced concrete large-span thin-shell system provided by the invention, the double-layer ribbed shell part faces the roof position direction of the roof shell, and the thickness of the double-layer ribbed shell part is gradually reduced; the thickness of the lightweight filler blocks in the double-layer ribbed housing portion in the direction of the roof position of the roof housing is gradually reduced.
In the invention, the double-layer ribbed shell part is arranged towards the roof position direction of the roof shell, so that the thickness of the light filling block and the thicknesses of the upper layer concrete shell plate and the lower layer concrete shell plate are respectively gradually reduced, thereby effectively reducing the problem of overlarge dead weight of the large-span building. Moreover, since the special structure of the double-layered ribbed shell portion is adopted in the present invention. That is, the upper concrete shell plate, the lower concrete shell plate and the separation rib plates form a plurality of containing cavity structures for containing the light filling blocks, so that the thickness of each part of the double-layer ribbed shell part can be simply and effectively adjusted, and the scheme realization difficulty is reduced.
10. According to the reinforced concrete large-span thin shell system provided by the invention, the outer contour edge of the solid shell connecting part is also provided with the turning eave extending towards the direction of the receiving base so as to form a hidden arched reinforcing structure; and the eave turning position is provided with a steel arch supporting structure and/or a concrete hidden arch structure extending along the outer contour direction of the roof shell.
In the invention, the flange is arranged at the outer contour edge of the connecting part of the solid shell. The turning eave can form an invisible arched reinforcing structure, so that the structural strength of the reinforced concrete large-span thin-shell building structure is improved. The steel arch supporting structure and the concrete hidden arch structure can effectively enhance the rigidity and the ductility of the edge part of the shell. In the present invention, a concrete arch structure and a steel arch structure are provided at the chamfer portions formed by the reverse eave shape. The hidden arch is used as an edge member of the shell, and the steel arch is arranged in the middle, so that the dead weight of the concrete can be effectively reduced, and the ductility of the whole structure can be increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a reinforcement elevation structure of a reinforced concrete large-span thin-shell building structure provided by the invention;
FIG. 2 is a schematic view of the relative positions of an embedment and a rib rebar provided by the invention;
FIG. 3 is an operation schematic diagram of binding a lower shell reinforcing steel mesh and rib plate dowel bars and presetting an anti-floating embedded part in the reinforced concrete large-span thin shell construction method provided by the invention;
fig. 4 is a schematic operation diagram of the reinforced concrete large-span thin-shell construction method for placing the light filling blocks and binding the upper-layer shell reinforcing steel bar net;
fig. 5 is a schematic operation diagram of pouring concrete to form a separation rib plate and an upper layer shell reinforcing mesh in the reinforced concrete large-span thin-shell construction method provided by the invention;
FIG. 6 is a schematic view of the connection structure of the receiving base, the tension beam and the steel arch support structure according to the present invention;
fig. 7 is a schematic perspective view of a reinforced concrete large-span thin-shell building structure provided by the invention;
fig. 8 is a cross-sectional view of a reinforced concrete large-span thin-shell building structure provided by the invention.
Reference numerals illustrate:
1-a lower layer shell reinforcing mesh; 2-rib plate dowel bars; 3-an anti-floating embedded part; 4-lower concrete shell plates; 5-rib plate reinforcing steel bars; 6-a lightweight filler block; 7-an upper layer shell reinforcing mesh; 8-separating rib plates; 9-upper concrete shell plates; 10-a protective layer clip; 11-a first hook structure; 12-a second hook structure; 13-receiving a base; 14-a bearing platform support; 15-bracing beams; 16-solid housing connection; 17-a double-layered ribbed shell portion; 18-top of the housing; 19-turning the eave; 20-steel arch support structure.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
The embodiment provides a construction method of a reinforced concrete large-span thin shell, which comprises the following steps:
step S0, as shown in fig. 6, includes: erecting a receiving base 13; embedding a pile foundation positioned underground, erecting a bearing platform support 14 above the pile foundation, and connecting adjacent bearing platform supports 14 through a pull beam 15; the plurality of pull beams 15 are sequentially connected with the plurality of bearing platform supports 14 to form a closed loop; the pull beam 15 is a prestressed reinforced concrete beam;
s1, as shown in FIG. 2, a scaffold is erected, a lower plate template is erected on the scaffold, a lower shell reinforcing steel bar net 1 and rib plate dowel bars 2 are bound above the lower plate template, and an anti-floating embedded part 3 is preset;
s2, pouring concrete into the lower-layer shell reinforcement mat 1 to form a lower-layer concrete shell plate 4 as shown in FIG. 4;
s3, binding rib plate reinforcing steel bars 5 on the basis of the rib plate dowel bars 2 as shown in FIG. 4;
s4, as shown in FIG. 4, placing light filling blocks 6 between adjacent rib plate dowel bars 2, and binding upper-layer shell reinforcing steel bar meshes 7; the light filling blocks 6 are fixed on the lower shell reinforcing steel bar net 1 through the anti-floating embedded parts 3, so that the light filling blocks 6 are prevented from floating or deforming due to buoyancy when concrete is poured; in step S4 of the present embodiment, further includes: a protective layer clamping piece 10 is arranged between the rib plate dowel bar 2 and the light filling block 6; the protective layer clamping piece 10 is used for supporting the light filling block 6 so as to prevent the light filling block 6 from sliding when the light filling block 6 is used for pouring concrete in the step S5;
s5, as shown in FIG. 5, concrete is poured to the rib plate dowel bars 2 and the rib plate reinforcing steel bars 5 to form separation rib plates 8; concrete is poured into the upper-layer concrete reinforcement mesh 7 to form an upper-layer concrete casing panel 9.
In the present embodiment, in step S0, the prestress tensioning of the tensioning beam 15 and the unloading of the support set in the construction of the roof housing are matched synchronously by setting a synchronous observation device;
when the construction of the bearing platform support 14 and the pull beam 15 is finished and the construction of the upper structure is prepared, 30% of prestress is firstly applied to the pull beam 15, the application of the rest of prestress is needed to wait for the construction of the roof shell to be finished, the support is combined to dismantle the unloading construction scheme, and the step tensioning is performed according to the principle of matching the thrust and the prestress, so that the bearing base 13 is ensured not to change outwards.
In this embodiment, the anti-floating embedded part 3 as shown in fig. 2 and 4 is a reinforcing steel bar;
the step S1 further includes: fixedly connecting a first hook structure 11 at the lower end position of the anti-floating embedded part 3 with the lower-layer shell reinforcing steel bar net 1;
the step S4 further includes: and fixedly connecting a second hook structure 12 at the upper end position of the anti-floating embedded part 3 with the light filling block 6.
Step S1 in the present embodiment further includes: when the included angle between the upper layer concrete shell plate 9 and the lower layer concrete shell plate 4 and the horizontal plane is larger than 45 degrees, the lower layer plate template is a double-layer template, and a double-layer template construction method is adopted.
A reinforced concrete long span thin shell system, as shown in fig. 7 and 1, comprising
A roof housing comprising: a solid housing connection 16, a double ribbed housing portion 17 and a housing top 18;
the double-layered ribbed housing portion 17 includes: an upper concrete casing plate 9, a lower concrete casing plate 4, a separation rib plate 8 arranged between the upper concrete casing plate 9 and the lower concrete casing plate 4, and a light filling block 6 and an anti-floating embedded part 3; the separation rib plates 8 divide the space enclosed by the upper layer concrete shell plate 9 and the lower layer concrete shell plate 4 into a plurality of accommodating cavities, and the light filling blocks 6 are filled in the accommodating cavities; the anti-floating embedded part 3 is used for preventing the light filling blocks 6 from floating or deforming due to buoyancy when concrete is poured. In the present embodiment, as shown in fig. 8, the double-layered ribbed housing part 17 is directed toward the roof position of the roof housing, and the thickness of the double-layered ribbed housing part 17 is gradually reduced; and, the thickness of the light filler 6 in the double-layer ribbed housing portion 17 toward the roof position of the roof housing gradually decreases;
the turnover edge 19 is arranged at the edge of the outer contour of the solid shell connecting part 16, and the turnover edge 19 extends towards the direction of the receiving base 13 to form a hidden arched reinforcing structure; the position of the turning eave 19 is provided with a steel arch supporting structure 20 and a concrete hidden arch structure which extend along the outer contour direction of the roof shell.
In this embodiment, as shown in fig. 4, a protective layer clip 10 is disposed between the rib plate dowel bar 2 and the lightweight filler block 6; the protective layer clamping piece 10 is used for supporting the light filling block 6 so as to prevent the light filling block 6 from sliding when the light filling block 6 is used for pouring concrete in the step S5; the protective layer clamping piece 10 is a wooden cushion block arranged between the separation rib plate 8 and the light filling block 6.
In this embodiment, as shown in fig. 4, the anti-floating embedded part 3 is a steel bar;
a first hook structure 11 fixedly connected with the lower-layer shell reinforcing mesh 1 is arranged at the lower end of the anti-floating embedded part 3;
the upper end position of the anti-floating embedded part 3 is provided with a second hook structure 12 fixedly connected with the light filling block 6.
Of course, in this embodiment, it is not specifically limited whether the protective layer clip 10 is provided between the rib plate dowel 2 and the light weight filler block 6, and in other embodiments, the protective layer clip 10 is not provided between the rib plate dowel 2 and the light weight filler block 6.
Of course, the specific structure of the anti-floating embedded part 3 is not specifically limited in this embodiment, and in other embodiments, the anti-floating embedded part 3 may also be a connecting part prefabricated at the bottom of the light filling block 6 and fixedly connected with the lower shell reinforcing mesh 1.
Of course, the specific structure of the protective layer clip 10 is not specifically limited in this embodiment, and in other embodiments, the protective layer clip 10 is a mortar pad disposed between the partition rib 8 and the lightweight filler 6.
Of course, the specific structure of the support structure in the turnover edge 19 is not specifically limited in this embodiment, and in other embodiments, the turnover edge 19 is provided with a steel arch support structure 20 extending along the outer contour direction of the roof housing.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (11)
1. The construction method of the reinforced concrete large-span thin shell is characterized by comprising the following steps of:
s1, building a scaffold, building a lower plate template on the scaffold, binding a lower shell reinforcing steel bar net (1) and rib plate dowel bars (2) above the lower plate template, and presetting an anti-floating embedded part (3);
s2, pouring concrete into the lower-layer shell reinforcement mesh (1) to form a lower-layer concrete shell plate (4);
s3, binding rib plate reinforcing steel bars (5) on the basis of the rib plate dowel bars (2);
s4, placing light filling blocks (6) between the adjacent rib plate dowel bars (2), and binding upper-layer shell reinforcing steel bar meshes (7); the light filling blocks (6) are fixed on the lower-layer shell reinforcing steel bar net (1) through the anti-floating embedded parts (3) so as to prevent the light filling blocks (6) from floating or deforming due to buoyancy when concrete is poured;
s5, pouring concrete to the rib plate dowel bars (2) and the rib plate reinforcing steel bars (5) to form separation rib plates (8); and pouring concrete into the upper layer shell reinforcing steel bar net (7) to form an upper layer concrete shell plate (9).
2. The method of constructing a long span thin shell of reinforced concrete as claimed in claim 1, further comprising, in step S4: a protective layer clamping piece (10) is arranged between the rib plate dowel bar (2) and the light filling block (6);
the protective layer clamping piece (10) is used for supporting the light filling block (6) so as to prevent the light filling block (6) from sliding when the light filling block (6) is used for pouring concrete in the step S5.
3. The construction method of the reinforced concrete large-span thin shell according to claim 1, wherein the anti-floating embedded part (3) is a steel bar;
the step S1 further includes: fixedly connecting a first hook structure (11) at the lower end position of the anti-floating embedded part (3) with the lower-layer shell reinforcing steel bar net (1);
the step S4 further includes: and fixedly connecting a second hook structure (12) at the upper end position of the anti-floating embedded part (3) with the light filling block (6).
4. The method of constructing a long span thin reinforced concrete shell according to claim 1, further comprising in step S1:
when the included angle between the upper layer concrete shell plate (9) and the lower layer concrete shell plate (4) and the horizontal plane is larger than 45 degrees, the lower layer plate template is a double-layer template, and a double-layer template construction method is adopted.
5. The method for constructing a long-span thin reinforced concrete shell according to claim 1, further comprising a step S0 before the step S1,
the step S0 includes: erecting a receiving base (13); burying a pile foundation positioned underground, erecting a bearing platform support (14) above the pile foundation, and connecting adjacent bearing platform supports (14) through a pull beam (15); the plurality of pull beams (15) are sequentially connected with the plurality of bearing platform supports (14) to form a closed loop; the tensile beam (15) is a prestressed reinforced concrete beam.
6. The method of construction of a reinforced concrete large-span thin shell according to claim 5, characterized in that in step S0, the prestress tensioning of the tension beam (15) and the unloading of the support provided for construction of the roof shell are matched in synchronization by setting a synchronization observation device;
when the bearing platform support (14) and the pull beam (15) are used for preparing a construction upper structure after construction is completed, 30% of prestress is firstly applied to the pull beam (15), the rest of prestress is applied, the construction scheme of combining support and dismantling and unloading is needed after construction of the roof shell is completed, and step tensioning is performed according to the principle of matching thrust and prestress, so that the bearing base (13) is ensured not to change outwards.
7. A reinforced concrete long-span thin-shell system according to the construction method of a reinforced concrete long-span thin-shell as claimed in claim 2, characterized by comprising
A roof housing comprising: a solid housing connection (16), a double ribbed housing portion (17) and a housing top (18);
the double-layer ribbed housing portion (17) includes: the anti-floating embedded part comprises an upper concrete shell plate (9), a lower concrete shell plate (4), a separation rib plate (8) arranged between the upper concrete shell plate (9) and the lower concrete shell plate (4), a light filling block (6) and an anti-floating embedded part (3); the separation rib plates (8) divide the space surrounded by the upper concrete shell plate (9) and the lower concrete shell plate (4) into a plurality of accommodating cavities, and the light filling blocks (6) are filled in the accommodating cavities; the anti-floating embedded part (3) is used for preventing the light filling blocks (6) from floating or deforming due to buoyancy when concrete is poured.
8. The reinforced concrete large span thin shell system according to claim 7, characterized in that the protective layer clip (10) is a wooden or mortar spacer arranged between the partition rib (8) and the lightweight filler block (6).
9. The reinforced concrete long span thin shell system of claim 7, wherein the anti-floating embedment (3) is a steel bar;
a first hook structure (11) fixedly connected with the lower-layer shell reinforcing steel bar net (1) is arranged at the lower end of the anti-floating embedded part (3);
the second hook structure (12) fixedly connected with the light filling block (6) is arranged at the upper end of the anti-floating embedded part (3).
10. The reinforced concrete large span thin shell system of claim 7, wherein the double ribbed shell portion (17) tapers in thickness towards the roof location of the roof shell;
the thickness of the lightweight filler blocks (6) in the double-layer ribbed housing part (17) in the direction of the roof position of the roof housing is gradually reduced.
11. The reinforced concrete large span thin shell system as claimed in claim 7, characterized in that the outer contour edge of the solid shell connection (16) also has a turned-over eave (19) extending towards the receiving base (13) to form a hidden arched reinforcement structure;
the position of the turnover eave (19) is provided with a steel arch supporting structure (20) and/or a concrete hidden arch structure which extend along the outer contour direction of the roof shell.
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| CN115874748A (en) | 2023-03-31 |
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