CN115874748A - 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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- CN115874748A CN115874748A CN202211546174.9A CN202211546174A CN115874748A CN 115874748 A CN115874748 A CN 115874748A CN 202211546174 A CN202211546174 A CN 202211546174A CN 115874748 A CN115874748 A CN 115874748A
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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, erecting a scaffold, erecting a lower plate template on the scaffold, binding a lower shell reinforcing mesh and ribbed plate joint bars above the lower plate template, and presetting an anti-floating embedded part; s2, pouring concrete into the lower-layer shell reinforcing mesh; s3, binding rib plate steel bars on the basis of the rib plate dowel bars; s4, placing light filling blocks between adjacent rib inserting bars, and binding an upper-layer shell reinforcing mesh; fixing the light filling block on a lower-layer shell steel bar net through an anti-floating embedded part; and S5, pouring concrete to form a partition rib plate and an upper concrete shell plate. The structure can overcome the problem that the roof shell in the prior art can not meet the requirements of the overall building structure strength and stability of the concrete flat shell with the rise 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
The reinforced concrete arc-shaped shell or the hyperbolic flat shell structure in the prior art can not meet the requirement of the ultra-large span reinforced concrete building thin-shell roof on the shell strength.
The existing building method of building an arc-shaped shell or a hyperbolic flat shell structure building generally needs to set up a steel pipe scaffold at high altitude, then a support steel frame is set up according to design requirements, and a shell is built on the support steel frame, so that a roof shell structure is formed. However, the roof shell of the existing structure can only meet the strength requirement of a small-span roof shell, and cannot meet the strength requirement of the whole building structure of a concrete flat shell with rise and minimum span not greater than 1/5 when the building span is large, and the problems of overlarge self weight and stress concentration of a large-span building cannot be solved. For example, the prior art can not solve the building requirements with large covering area such as gymnasiums with large building area or water sports centers. Therefore, there is a strong need for those skilled in the art to solve the problem of how to construct a large-span shell system under the condition of ensuring building strength and structural stability.
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 and cannot meet the strength requirement of the whole building structure of a concrete flat shell with rise and minimum span not greater than 1/5 when the building span is large, and the existing structure cannot solve the problems of overlarge self weight and stress concentration 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, erecting a scaffold, erecting a lower-layer template on the scaffold, binding a lower-layer shell reinforcing mesh and rib plate inserting ribs above the lower-layer template, and presetting anti-floating embedded parts;
s2, pouring concrete to the lower-layer shell reinforcing mesh to form a lower-layer concrete shell plate;
s3, binding rib plate steel bars on the basis of the rib plate dowel bars;
s4, placing a light filling block between the adjacent rib plate joint bars, and binding an upper-layer shell reinforcing mesh; the light filling block is fixed on the lower shell steel bar net through the anti-floating embedded part so as to prevent the light filling block from floating or deforming under the action of buoyancy when concrete is poured;
s5, pouring concrete to the rib plate inserting ribs and the rib plate reinforcing steel bars to form separating rib plates; and pouring concrete to the upper layer of shell reinforcing mesh to form an upper layer of concrete shell plate.
Optionally, in step S4, the method further includes: a protective layer clamping piece is arranged between the ribbed slab dowel 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 lower-layer shell reinforcing mesh;
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 includes, in step S1:
and when the included angles between the upper-layer concrete shell plate and the horizontal plane and between the lower-layer concrete shell plate and the horizontal plane are more than 45 degrees, the lower-layer plate formwork is a double-layer formwork, and a double-layer formwork construction method is adopted.
Optionally, there is a step S0 before the step S1,
the step S0 includes: erecting a bearing base; burying underground pile foundation and setting up bearing above pile foundation
The platform supports are connected with the adjacent bearing platform supports through tie beams; the plurality of the tension beams are sequentially connected with the plurality of the 5 bearing platform supports to form a closed loop; the tension beam is a prestressed reinforced concrete beam.
Optionally, in step S0, the prestress tensioning of the tension beam and the unloading of the support set for the roof shell construction are synchronized by setting a synchronization observation device to implement synchronization matching;
and when the upper structure is prepared for construction after the construction of the bearing platform support and the tension beam is finished, firstly applying 30% of prestress to the tension beam, applying the rest of prestress to the roof shell, and combining a 0-support dismantling and unloading construction scheme after the construction of the roof shell is finished, and performing step-by-step tensioning according to the principle of matching thrust and prestress so as to ensure that the bearing base does not deform outwards.
A reinforced concrete large-span thin shell system comprises
A roof housing comprising: a solid housing connection, a double-layer ribbed housing portion and a housing top;
the double-layer ribbed housing portion includes: the concrete floating structure comprises an upper concrete shell plate, a lower concrete shell plate, a separation rib plate, a light filling block and an anti-floating embedded part, wherein the separation rib plate is arranged between the upper concrete shell plate and the lower concrete shell plate 5; the separation rib plate divides a space enclosed by the upper concrete shell plate and the lower 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 upwards or deforming under the action of buoyancy when concrete is poured.
Optionally, the protective layer fastener is a wood cushion block or a mortar cushion block arranged between the partition 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 lower-layer shell reinforcing mesh 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 portion is oriented to the roof position of the roof shell, and the thickness of the double-layer ribbed shell portion is gradually reduced;
the thickness of the light filling block in the double-layer ribbed shell part towards the direction of the roof position of the roof shell is gradually reduced.
Optionally, the outer contour edge of the solid shell connecting part is further provided with a turned eave extending towards the bearing base so as to form an invisible arch-shaped reinforcing structure;
and a steel arch supporting structure and/or a concrete hidden arch structure extending along the outer contour direction of the roof shell is/are arranged at the eave turning position.
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, erecting a scaffold, erecting a lower-layer template on the scaffold, binding a lower-layer shell reinforcing mesh and rib plate inserting ribs above the lower-layer template, and presetting anti-floating embedded parts;
s2, pouring concrete into the lower-layer shell reinforcing mesh to form a lower-layer concrete shell plate;
s3, binding rib plate steel bars on the basis of the rib plate dowel bars;
s4, placing a light filling block between the adjacent rib plate joint bars, and binding an upper-layer shell reinforcing mesh; the light filling block is fixed on the lower-layer shell steel bar net through the anti-floating embedded part so as to prevent the light filling block from floating or deforming under the action of buoyancy when concrete is poured;
s5, pouring concrete to the rib plate inserting ribs and the rib plate reinforcing steel bars to form separating rib plates; and pouring concrete to the upper layer of shell reinforcing mesh to form an upper layer of concrete shell plate.
The existing method for building an arc-shaped shell or a hyperbolic flat shell structure building generally needs to set up a steel pipe scaffold at high altitude, then a support steel frame is set up according to design requirements, and a shell is constructed on the support steel frame, so that a house is formed
A lid housing structure. However, the roof shell of the existing structure can only meet the requirement of 5 degrees of strength of a small-span roof shell, and cannot meet the requirement of the overall building structure strength of the concrete flat shell with rise and minimum span not greater than 1/5 when the building span is large, and the problems of overlarge self weight and stress concentration of a large-span building cannot be solved. According to the construction method of the reinforced concrete large-span thin shell, a plurality of accommodating cavities can be formed by the upper concrete shell plate, the lower concrete shell plate and the partition rib plates, and then the light weight is formed
The light filling blocks of the material are filled into the accommodating cavity, so that the problem that the self weight of the large-span building is too large 0 can be effectively solved. And, through directly pouring concrete in floor dowel bar and light filling block, above-mentioned concrete can
So as to firmly and reliably fix the light filling block on the upper layer shell reinforcing mesh, the lower layer shell reinforcing mesh and the ribbed plate inserted bars. By the construction method, the roof shell can effectively meet the requirement of the overall building structure strength of the concrete flat shell with the rise and the minimum span not more than 1/5 when the building span is large. In addition, to solve
The problem that the light filling block is light in weight and floats upwards when concrete is poured is solved. The anti-floating embedded part is also arranged in the invention 5, and the anti-floating embedded part can effectively fix the position of the light filling block, so that the scheme can be realized.
2. The construction method of the reinforced concrete large-span thin shell provided by the invention further comprises the following steps in step S4:
a protective layer clamping piece is arranged between the ribbed slab dowel and the light filling block;
the protective layer clamping piece is used for supporting the light filling block to prevent the light filling block 0 from sliding when the concrete is poured in the step S5, so that the pouring effect of the concrete is ensured.
3. According to the construction method of the reinforced concrete large-span thin shell, the anti-floating embedded part is a reinforcing steel bar; the step S1 further includes: a first hook structure and a second hook structure for connecting the lower end of the anti-floating embedded part
The lower shell steel bar mesh is fixedly connected; step S4 further includes: and fixedly connecting the second hook structure at the upper end position 5 of the anti-floating embedded part with the light filling block.
The anti-floating embedded part is a steel bar of which the upper end and the lower end are respectively provided with a first hook structure and a second hook structure. The anti-floating embedded part can effectively fix the light filling block on the lower-layer shell steel bar net, so that the light filling block can not float upwards in the concrete pouring process simply and reliably.
4. The invention provides a construction method of a reinforced concrete large-span thin shell, which comprises the following steps in step S1: and when the included angles between the upper-layer concrete shell plate and the horizontal plane and between the lower-layer concrete shell plate and the horizontal plane are more 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 horizontal plane and the included angle between the lower-layer concrete shell plate and the horizontal plane are larger than 45 degrees, the construction effect can be effectively guaranteed through the double-layer formwork construction method.
5. The construction method of the reinforced concrete large-span thin shell provided by the invention also comprises a step S0 before the step S1, wherein the step S0 comprises the following steps: erecting a bearing base; embedding a pile foundation under the ground, erecting a bearing platform support above the pile foundation, and connecting adjacent bearing platform supports through tie beams; the plurality of tension beams are sequentially connected with the plurality of bearing platform supports to form a closed loop; the tension beam is a prestressed reinforced concrete beam.
In the invention, the tension beams are arranged between the adjacent bearing platform supports, and the plurality of tension 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 the horizontal thrust transmitted by a steel arch supporting structure or a 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 the step S0, the prestress tension of the tension beam and the unloading of the support for roof shell construction are synchronously matched by arranging synchronous observation equipment;
and when the upper structure is prepared for construction after the construction of the bearing platform support and the tension beam is finished, firstly applying 30% of prestress to the tension beam, applying the rest of prestress to the roof shell, combining a support dismantling and unloading construction scheme after the construction of the roof shell is finished, and performing step-by-step tensioning according to the principle of matching of thrust and prestress so as to ensure that the bearing base does not deform outwards.
In the invention, because of the characteristics of the flat shell, the roof shell is influenced by the self weight of the roof shell, and an outward thrust is applied to the bearing base, the thrust is firstly resisted by the horizontal bearing capacity of the pile foundation at the lower parts of the four bearing platform supports of the roof shell, the horizontal bearing capacity of the pile foundation is usually smaller, and a tension beam is required to be arranged for balancing when the structural span of the shell is larger. The shell structure in the invention has huge span, the straining beams with huge thrust need to be arranged to balance the thrust transmitted by the roof shell, and the straining beams with huge thrust need to be provided with prestress to control the cracks and the deformation of the straining beams, so the prestress tensioning of the straining beams needs to be matched with the construction of the shell roof to effectively control the thrust generated by the shell, and simultaneously, the invention can not apply all prestress to the straining beams at one time, thereby avoiding the problem that the pile foundation is damaged due to the reverse displacement.
7. The invention provides a reinforced concrete large-span thin shell system, which comprises
A roof housing comprising: a solid housing connection, a double-layer ribbed housing portion and a housing top;
the double-layer ribbed housing portion includes: the concrete floating structure comprises an upper concrete shell plate, a lower concrete shell plate, a partition rib plate, a light filling block and an anti-floating embedded part, wherein the partition rib plate is arranged between the upper concrete shell plate and the lower concrete shell plate; the partition rib plate partitions a space enclosed by the upper concrete shell plate and the lower 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 upwards or deforming under the action of buoyancy when concrete is poured.
In the invention, the solid shell connecting part, the double-layer ribbed shell part and the shell top form the roof shell, so that the stress on the upper part of the roof shell can be effectively dispersed to the solid shell connecting part on the bottom of the shell, thereby avoiding the problem of stress concentration. Through the structure, the roof shell can effectively meet the requirement of the overall building structure strength of the concrete flat shell with the rise and the minimum span not more than 1/5 when the building span is large. And moreover, a plurality of accommodating cavities are formed by the upper concrete shell plate, the lower concrete shell plate and the partition rib plates, and then the accommodating cavities are filled with light filling blocks made of light materials, so that the problem of overlarge self weight of a large-span building can be effectively solved.
8. According to the reinforced concrete large-span thin-shell system provided by the invention, the protective layer clamping piece is a wood cushion block or a mortar cushion block arranged between the separation rib plate and the light filling block.
In the invention, the wood cushion block or the mortar cushion block can effectively prevent the light filling block from sliding when the concrete is poured in the step S5, thereby ensuring the pouring effect of the concrete. Moreover, the wood cushion block or the mortar cushion block also 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 to the direction of the roof position of the roof shell, and the thickness of the double-layer ribbed shell part is gradually reduced; the thickness of the light filling block in the double-layer ribbed shell part towards the direction of the roof position of the roof shell is gradually reduced.
In the invention, 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 and gradually reduced by arranging the double-layer ribbed shell part towards the direction of the roof position of the roof shell, so that the problem of overlarge self weight of a large-span building can be effectively reduced. In addition, the invention adopts the special structure of the double-layer ribbed shell part. Namely, the upper concrete shell plate, the lower concrete shell plate and the partition rib plates form a plurality of accommodating cavity structures for accommodating 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 implementation 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 eave extending towards the bearing base so as to form an invisible arched reinforcing structure; and a steel arch supporting structure and/or a concrete hidden arch structure extending along the outer contour direction of the roof shell is/are arranged at the eave turning position.
In the invention, the edge of the outer contour of the connecting part of the solid shell is provided with the turned eaves. The turned eaves can form an invisible arch-shaped 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 ductility of the edge part of the shell. In the present invention, the concrete hidden arch structure and the steel arch structure are provided at the chamfered portions formed by the eave-turned form, respectively. The hidden arches are used as edge members of the shell, and the steel arch arranged in the middle can effectively reduce the self weight of concrete and increase the ductility of the whole structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a reinforced concrete large-span thin-shell building structure with reinforcement vertical surfaces;
FIG. 2 is a schematic diagram of the relative positions of an embedment member and a ribbed slab reinforcement provided by the present invention;
fig. 3 is an operation schematic diagram of binding a lower shell reinforcing mesh and ribbed plate joint bars and presetting anti-floating embedded parts in the reinforced concrete large-span thin shell construction method provided by the invention;
FIG. 4 is a schematic diagram illustrating operations of placing lightweight filling blocks and binding upper shell reinforcing meshes in the reinforced concrete large-span thin shell construction method provided by the present invention;
fig. 5 is a schematic view illustrating an operation of casting concrete to form a partition rib and an upper shell reinforcing mesh in the reinforced concrete large-span thin shell construction method according to the present invention;
FIG. 6 is a schematic view of a connection structure of the receiving base, the tie beam and the steel arch support structure provided by the present invention;
FIG. 7 is a schematic view of a three-dimensional structure of a reinforced concrete large-span thin-shell building structure provided by the present invention;
fig. 8 is a sectional view of a reinforced concrete large-span thin-shelled building structure provided by the present invention.
Description of the reference numerals:
1-lower layer shell steel bar mesh; 2-rib plate dowel bars; 3-preventing a floating embedded part; 4-lower concrete shell slab; 5-ribbed plate reinforcing steel bars; 6-light filling block; 7-upper shell reinforcing mesh; 8-a separating rib plate; 9-upper concrete shell slab; 10-protective layer cards; 11-a first hook configuration; 12-a second hook configuration; 13-receiving a base; 14-a cushion cap support; 15-pulling the beam; 16-solid housing connection; 17-a double-layer ribbed shell portion; 18-the top of the housing; 19-eaves overturning; 20-steel arch support structure.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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 bearing base 13; burying underground pile foundation, setting up bearing platform support 14 above the pile foundation, and connecting adjacent bearing platform supports 14 through tie beams 15; the plurality of tie beams 15 are sequentially connected with the plurality of bearing platform supports 14 to form a closed loop; the tension beam 15 is a prestressed reinforced concrete beam;
s1, as shown in figure 2, erecting a scaffold, erecting a lower-layer template on the scaffold, binding a lower-layer shell reinforcing mesh 1 and rib plate inserting ribs 2 above the lower-layer template, and presetting anti-floating embedded parts 3;
s2, as shown in fig. 4, pouring concrete into the lower shell steel bar mesh 1 to form a lower concrete shell slab 4;
s3, binding rib plate steel bars 5 on the basis of the rib plate inserting bars 2 as shown in the figure 4;
s4, as shown in the figure 4, placing a light filling block 6 between the adjacent ribbed slab dowel bars 2, and binding an upper-layer shell reinforcing mesh 7; the light filling blocks 6 are fixed on the lower-layer shell reinforcing mesh 1 through the anti-floating embedded parts 3, so that the light filling blocks 6 are prevented from floating or deforming under the action of buoyancy when concrete is poured; in step S4 of this embodiment, the method further includes: a protective layer clamping piece 10 is arranged between the ribbed slab dowel 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 concrete is poured in the step S5;
s5, as shown in fig. 5, pouring concrete to the rib plate inserting ribs 2 and the rib plate reinforcing steel bars 5 to form separating rib plates 8; concrete is poured into the upper shell rebar grid 7 to form an upper concrete shell slab 9.
In this embodiment, in step S0, the prestress tension of the tension beam 15 and the unloading of the supports set for the roof shell construction are synchronized by setting a synchronization observation device to realize synchronization matching;
when the upper structure is prepared for construction after the construction of the bearing platform support 14 and the tension beam 15 is completed, 30% of prestress is firstly applied to the tension beam 15, and the application of the rest of prestress needs to be combined with a construction scheme of support removal and unloading after the construction of the roof shell is completed, and step-by-step tensioning is carried out according to the principle of matching of thrust and prestress so as to ensure that the bearing base 13 does not deform outwards.
In the embodiment, the anti-floating embedded parts 3 shown in fig. 2 and 4 are steel bars;
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 mesh 1;
step S4 further includes: and fixedly connecting the 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 this embodiment further includes: and when the included angles between the upper-layer concrete shell plate 9 and the lower-layer concrete shell plate 4 and the horizontal plane are more than 45 degrees, the lower-layer plate template is a double-layer template, and a double-layer template construction method is adopted.
The reinforced concrete large-span thin shell system, as shown in fig. 7 and fig. 1, includes
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 concrete composite floor 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 partition rib plate 8 partitions the space enclosed 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 block 6 from floating upwards or deforming under the action of buoyancy when concrete is poured. In the present embodiment, as shown in fig. 8, the thickness of the double-layer ribbed shell portion 17 is gradually reduced towards the roof position of the roof shell 17; and the thickness of the light filling block 6 in the double-layer ribbed shell part 17 towards the direction of the roof position of the roof shell is gradually reduced;
the turned eaves 19 are arranged at the outer contour edge of the solid shell connecting part 16, and the turned eaves 19 extend towards the bearing base 13 to form an invisible arch-shaped reinforcing structure; and a steel arch supporting structure 20 and a concrete hidden arch structure which extend along the outer contour direction of the roof shell are arranged at the position of the turned eave 19.
In this embodiment, as shown in fig. 4, a protective layer fastener 10 is disposed between the rib plate 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 concrete is poured in the step S5; the protective layer fastener 10 is a wooden block arranged between the partition 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;
and a 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.
Of course, the present embodiment does not specifically limit whether the protective layer fastener 10 is disposed between the rib plate 2 and the light weight filling block 6, and in other embodiments, the protective layer fastener 10 is not disposed between the rib plate 2 and the light weight filling block 6.
Certainly, 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 connector that is prefabricated at the bottom of the light filling block 6 and is fixedly connected with the lower-layer casing rebar grid 1.
Certainly, the specific structure of the protective layer fastener 10 is not specifically limited in this embodiment, and in other embodiments, the protective layer fastener 10 is a mortar cushion block disposed between the partition rib 8 and the light filling block 6.
Of course, the specific structure of the support structure in the eaves 19 is not limited in this embodiment, and in other embodiments, a steel arch support structure 20 extending along the outer contour direction of the roof housing is disposed at the eaves 19.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (11)
1. A construction method of a reinforced concrete large-span thin shell is characterized by comprising the following steps:
s1, erecting a scaffold, erecting a lower-layer template on the scaffold, binding a lower-layer shell reinforcing mesh (1) and rib plate inserting ribs (2) above the lower-layer template, and presetting anti-floating embedded parts (3);
s2, pouring concrete into the lower-layer shell reinforcing mesh (1) to form a lower-layer concrete shell plate (4);
s3, binding rib plate steel bars (5) on the basis of the rib plate inserting bars (2);
s4, placing a light filling block (6) between the adjacent rib plate joint bars (2), and binding an upper-layer shell reinforcing mesh (7); the light filling blocks (6) are fixed on the lower-layer shell reinforcing mesh (1) through the anti-floating embedded parts (3) so as to prevent the light filling blocks (6) from floating or deforming under the action of buoyancy when concrete is poured;
s5, pouring concrete to the rib plate inserting ribs (2) and the rib plate reinforcing steel bars (5) to form separating rib plates (8); and pouring concrete into the upper-layer shell reinforcing mesh (7) to form an upper-layer concrete shell plate (9).
2. The construction method of the reinforced concrete large-span thin shell as claimed in claim 1, further comprising, in step S4: a protective layer clamping piece (10) is arranged between the ribbed slab dowel (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 concrete is poured 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 parts (3) are reinforcing steel bars;
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 mesh (1);
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 construction method of a reinforced concrete large-span thin shell according to claim 1, further comprising, in step S1:
and when the included angle between the upper-layer concrete shell plate (9) and the horizontal plane and the included angle between the lower-layer concrete shell plate (4) and the horizontal plane are more than 45 degrees, the lower-layer plate template is a double-layer template, and a double-layer template construction method is adopted.
5. The construction method of reinforced concrete large-span thin shell as claimed in claim 1, further comprising step S0 before step S1,
the step S0 includes: setting up a bearing base (13); burying underground pile foundation, setting up bearing platform support (14) above the pile foundation, and connecting adjacent bearing platform support (14) through tie beam (15); the plurality of tension beams (15) are sequentially connected with the plurality of bearing platform supports (14) to form a closed loop; the tension beam (15) is a prestressed reinforced concrete beam.
6. The construction method of reinforced concrete large-span thin shell as claimed in claim 5, wherein in step S0, the prestressed tension of said tension beam (15) and the unloading of the supports set for roof shell construction are synchronized by setting a synchronization observation device to achieve synchronization matching;
when the upper structure is prepared to be constructed after the construction of the bearing platform support (14) and the tension beam (15) is completed, 30% of prestress is firstly applied to the tension beam (15), the application of the rest of prestress needs to be combined with a construction scheme of support removal and unloading after the construction of the roof shell is completed, and step-by-step tensioning is carried out according to the principle of matching of thrust and prestress so as to ensure that the bearing base (13) does not deform outwards.
7. A reinforced concrete large-span thin shell system of the construction method of the reinforced concrete large-span thin shell as claimed in claim 2, comprising
A roof housing comprising: a solid housing connection (16), a double-layer ribbed housing portion (17) and a housing top (18);
the double-layer ribbed shell portion (17) comprises: the concrete-filled composite floor slab comprises an upper-layer concrete shell plate (9), a lower-layer concrete shell plate (4), a separation rib plate (8) arranged between the upper-layer concrete shell plate (9) and the lower-layer concrete shell plate (4), a light filling block (6) and an anti-floating embedded part (3); the space enclosed by the upper concrete shell plate (9) and the lower concrete shell plate (4) is divided into a plurality of accommodating cavities by the partition rib plate (8), 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 block (6) from floating upwards or deforming under the action of buoyancy when concrete is poured.
8. A reinforced concrete large-span thin shell system according to claim 7, characterized in that the protective layer fastener (10) is a wood or mortar block disposed between the partition rib (8) and the light filling block (6).
9. The reinforced concrete large-span thin-shell system according to claim 7, wherein the anti-floating embedded parts (3) are steel bars;
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);
and a 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 as claimed in claim 7, wherein the double-layer ribbed shell portion (17) has a thickness gradually decreasing toward a roof position of the roof shell;
the thickness of the light filling block (6) in the double-layer ribbed shell part (17) towards the direction of the roof position of the roof shell is gradually reduced.
11. A thin shell system of reinforced concrete large span according to claim 7, characterized in that the outer contour edges of the solid shell connecting parts (16) are further provided with eaves (19) extending towards the receiving base (13) to form an invisible arch reinforcement structure;
and a steel arch supporting structure (20) and/or a concrete hidden arch structure extending along the outer contour direction of the roof shell is/are arranged at the position of the turned eave (19).
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| CN115874748B (en) | 2023-08-29 |
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