阅读说明：本技术 圆形竖井混凝土底板钢筋支架体系及施工方法 (Circular shaft concrete bottom plate steel bar support system and construction method ) 是由 黄周琰 张哲彬 印成玺 曹俊逸 李煜峰 邹峰 李吉勇 顾欢 蔡素素 郑憧 陈志强 于 2021-07-09 设计创作，主要内容包括：本发明涉及一种圆形竖井混凝土底板钢筋支架体系及施工方法,该钢筋支架体系包括内环和外环两种单元标准模块；多个外环单元标准模块围成一个圆形钢筋支架,圆形钢筋支架内布置由多个内环单元标准模块组成的内环钢筋支架,所述内环单元标准模块对应布置形式为正交的钢筋网片；所述外环单元标准模块对应布置形式为径向与环向的钢筋网片。本发明应用贴合圆形底板钢筋受力形态,改变了传统钢筋支架需要现场焊接拼装,既占用大量人力资源现场施工质量又得不到保障的问题,具有质量可靠,安装快速,可与钢筋网铺设同时流水施工等优点。(The invention relates to a round shaft concrete bottom plate steel bar support system and a construction method thereof, wherein the steel bar support system comprises an inner ring and an outer ring which are two unit standard modules; the plurality of outer ring unit standard modules enclose a circular steel bar support, an inner ring steel bar support consisting of a plurality of inner ring unit standard modules is arranged in the circular steel bar support, and the inner ring unit standard modules are correspondingly arranged in an orthogonal steel bar mesh form; the standard modules of the outer ring unit are correspondingly arranged in the radial and circumferential reinforcing mesh sheets. The invention applies the stress shape of the steel bar attached to the circular bottom plate, changes the problem that the traditional steel bar bracket needs to be welded and assembled on site, occupies a large amount of human resources, and has the advantages of site construction quality occupation and incapability of guaranteeing, reliable quality, quick installation, capability of being laid with a steel bar mesh and simultaneously performing running water construction, and the like.)

1. The utility model provides a circular shaft concrete bottom plate steel bar support system which characterized in that: the steel bar support system comprises an inner ring and an outer ring which are unit standard modules; the plurality of outer ring unit standard modules enclose a circular steel bar support, an inner ring steel bar support consisting of a plurality of inner ring unit standard modules is arranged in the circular steel bar support, and the inner ring unit standard modules are correspondingly arranged in an orthogonal steel bar mesh form; the standard modules of the outer ring unit are correspondingly arranged in the radial and circumferential reinforcing mesh sheets.

2. The round shaft concrete floor steel bar bracket system of claim 1, which is characterized in that: the inner ring unit standard module and the outer ring unit standard module are respectively composed of a horizontal stress rod, a vertical stress rod, a horizontal connecting rod, a stable connecting rod and an adjustable base; the first row of steel bars of the steel bar net are placed on the horizontal stress rods from bottom to top, and the horizontal stress rods are arranged orthogonally to the horizontal stress rods; the vertical stress rod is arranged below the horizontal stress rod, the upper part of the vertical stress rod is connected with the horizontal stress rod, the lower part of the vertical stress rod is connected with the adjustable base, and the vertical stress rod is used for stress transmission and transmitting the load of the upper horizontal stress rod to the lower adjustable base; the horizontal connecting rods are orthogonally connected with the horizontal stress rods, and the horizontal connecting rods connect the plurality of horizontal stress rods into a whole to form a unit standard module; the stable connecting rods are connected with the vertical stress rods to form a whole, and the arrangement of the stable connecting rods ensures the stability requirement of the unit standard modules; the adjustable bottom support comprises a pre-buried base and an adjusting piece, the pre-buried base is installed in a bottom plate cushion layer and used for installing and positioning the unit standard module and transmitting the load of the vertical stress rod to a foundation, and the adjusting piece is used for adjusting the level of the unit module and guaranteeing the installation accuracy.

3. The circular shaft concrete floor steel bar bracket system of claim 2, which is characterized in that: the horizontal stress rods in the inner ring unit standard module are arranged into a group of rods arranged in parallel, the horizontal stress rods in the outer ring unit are arranged into a group of rods arranged in a radial mode, virtual connecting lines in the radial direction of the rods intersect at the circle center of the circular bottom plate, and the horizontal stress rods are used for directly bearing the weight of the reinforcing steel bars and construction load.

4. The round shaft concrete floor steel bar bracket system of claim 1, which is characterized in that: the inner ring unit standard modules and the outer ring unit standard modules are prefabricated, the inner ring unit standard modules are divided according to horizontal intervals, and the outer ring unit standard modules are divided according to the circle center angle of the circular concrete bottom plate; the division of the inner ring unit standard module and the division of the outer ring unit standard module both meet the requirement of hoisting installation capacity; the whole circular shaft concrete bottom plate steel bar support system is connected into a final stress whole through an additional horizontal connecting rod.

5. A construction method of the circular shaft concrete bottom plate steel bar support system according to any one of claims 1 to 4, characterized by comprising the following steps:

firstly, after a foundation pit is excavated to a bottom plate construction design elevation, paving a layer of broken stone cushion layer, inserting a pre-embedded base in a steel bar support system into soil to serve as an elevation control pile, and serving as a position positioning control point of the steel bar support system;

step two, pouring a plain concrete cushion layer on the broken stone cushion layer, and pouring a concrete cushion beam together, wherein the height of the cushion beam is equal to the thickness of the reinforced concrete protective layer on the soil facing surface of the reinforcing steel bars of the bottom plate; the width, position and shape of the pad beam are determined according to other conditions;

thirdly, laying a lower layer of steel bar mesh of the circular concrete bottom plate on the pad beam in different areas, synchronously installing unit standard modules of the steel bar support system, installing the unit standard modules in place in a hoisting mode, fixing the lower part of the vertical stress rod and the embedded base in a mechanical connection mode, and adjusting the horizontal precision of the support through an adjusting piece to ensure that the elevation of the upper layer of steel bar mesh and the overall stress of the steel bar support system are uniform;

after the local unit standard modules are installed, fixing different unit standard modules into a whole in a mechanical connection mode through additional horizontal connecting rods; paving a circular concrete bottom plate upper layer steel bar net sheet on the finished steel bar support system;

step five, repeating the step three and the step four, ensuring synchronous flow construction of upper and lower layers of reinforcing steel bars of the bottom plate in a spatial three-dimensional plane, reserving a unit standard module for final installation, and using the unit standard module as an upper and lower layer personnel channel during construction of the reinforcing steel bars of the bottom plate;

and step six, after the lower layer steel bars of the circular concrete bottom plate are qualified, installing the last unit standard module and the additional horizontal connecting rod to form a final bottom plate steel bar support system, completing the construction of the upper steel bar net piece and finally pouring the bottom plate concrete.

Technical Field

The invention relates to the technical field of thick-bottom concrete structure construction, in particular to a circular vertical shaft concrete bottom plate steel bar support system and a construction method.

Background

Along with the rapid development of urban buildings, on one hand, super high-rise buildings enter a rapid development stage, and on the other hand, the underground shallow layer of the city is developed completely, the embedding depth of the underground structure of the building (structure) is correspondingly and continuously deepened, and the thickness of the basic raft is correspondingly and continuously thickened. The bottom plate steel bars are characterized in that the arrangement forms are cross-shaped orthogonal and annular and radial intersected.

The circular concrete bottom plate steel bar support has the characteristics that firstly, the support height is high, and the requirements are difficult to meet by adopting the traditional temporary steel bar support (stirrup); secondly, the amount of the reinforcing bars is often large, the self weight of the reinforcing bars at the top and the construction load acting on the upper part are added, and the effect generated by load combination is not small, so that the reinforcing bar support needs to be specially designed, thirdly, the construction of the base plate is often in the moment of the maximum risk of the construction of the ultra-deep foundation pit, whether the construction of the base plate can be quickly completed or not, the safety of the supporting system project is formed, the safety and the installation quality of the installation and the construction of the reinforcing bars in the construction are ensured, and the problem that the field welding operation needs to be considered in the design process of the reinforcing bar support is reduced as much as possible.

Disclosure of Invention

The invention aims to provide a circular shaft concrete bottom plate steel bar support system and a construction method.

The technical scheme of the invention is as follows:

a circular shaft concrete bottom plate steel bar support system comprises an inner ring and an outer ring which are two unit standard modules; the plurality of outer ring unit standard modules enclose a circular steel bar support, an inner ring steel bar support consisting of a plurality of inner ring unit standard modules is arranged in the circular steel bar support, and the inner ring unit standard modules are correspondingly arranged in an orthogonal steel bar mesh form; the standard modules of the outer ring unit are correspondingly arranged in the radial and circumferential reinforcing mesh sheets.

Furthermore, the unit standard modules are all composed of a horizontal stress rod, a vertical stress rod, a horizontal connecting rod, a stable connecting rod and an adjustable base; the first row of steel bars of the steel bar net are placed on the horizontal stress rods from bottom to top, and the horizontal stress rods are arranged orthogonally to the horizontal stress rods; the vertical stress rod is arranged below the horizontal stress rod, the upper part of the vertical stress rod is connected with the horizontal stress rod, the lower part of the vertical stress rod is connected with the adjustable base, and the vertical stress rod is used for stress transmission and transmitting the load of the upper horizontal stress rod to the lower adjustable base; the horizontal connecting rods are orthogonally connected with the horizontal stress rods, and the horizontal connecting rods connect the plurality of horizontal stress rods into a whole to form a unit standard module; the stable connecting rods are connected with the vertical stress rods to form a whole, and the arrangement of the stable connecting rods ensures the stability requirement of the unit standard modules; the adjustable bottom support comprises a pre-buried base and an adjusting piece, the pre-buried base is installed in a bottom plate cushion layer and used for installing and positioning the unit standard module and transmitting the load of the vertical stress rod to a foundation, and the adjusting piece is used for adjusting the level of the unit module and guaranteeing the installation accuracy.

Furthermore, the horizontal stress rods in the inner ring unit standard module are arranged into a group of rods arranged in parallel, the horizontal stress rods in the outer ring unit are arranged into a group of rods arranged in a radial mode, virtual connecting lines in the radial direction of the rods intersect at the circle center of the circular bottom plate, and the horizontal stress rods are used for directly bearing the weight of the steel bars and construction load.

Further, the inner ring unit standard modules and the outer ring unit standard modules are prefabricated, the inner ring unit standard modules are divided according to horizontal intervals, and the outer ring unit standard modules are divided according to the circle center angle of the circular concrete bottom plate; the division of the inner ring unit standard module and the division of the outer ring unit standard module both meet the requirement of hoisting installation capacity; the whole circular shaft concrete bottom plate steel bar support system is connected into a final stress whole through an additional horizontal connecting rod.

A construction method of a circular shaft concrete bottom plate steel bar support system comprises the following steps:

firstly, after a foundation pit is excavated to a bottom plate construction design elevation, paving a layer of broken stone cushion layer, inserting a pre-embedded base in a steel bar support system into soil to serve as an elevation control pile, and serving as a position positioning control point of the steel bar support system;

step two, pouring a plain concrete cushion layer on the broken stone cushion layer, and pouring a concrete cushion beam together, wherein the height of the cushion beam is equal to the thickness of the reinforced concrete protective layer on the soil facing surface of the reinforcing steel bars of the bottom plate; the width, position and shape of the pad beam are determined according to other conditions;

thirdly, laying a lower layer of steel bar mesh of the circular concrete bottom plate on the pad beam in different areas, synchronously installing unit standard modules of the steel bar support system, installing the unit standard modules in place in a hoisting mode, fixing the lower part of the vertical stress rod and the embedded base in a mechanical connection mode, and adjusting the horizontal precision of the support through an adjusting piece to ensure that the elevation of the upper layer of steel bar mesh and the overall stress of the steel bar support system are uniform;

after the local unit standard modules are installed, fixing different unit standard modules into a whole in a mechanical connection mode through additional horizontal connecting rods; paving a circular concrete bottom plate upper layer steel bar net sheet on the finished steel bar support system;

step five, repeating the step three and the step four, ensuring synchronous flow construction of upper and lower layers of reinforcing steel bars of the bottom plate in a spatial three-dimensional plane, reserving a unit standard module for final installation, and using the unit standard module as an upper and lower layer personnel channel during construction of the reinforcing steel bars of the bottom plate;

and step six, after the lower layer steel bars of the circular concrete bottom plate are qualified, installing the last unit standard module and the additional horizontal connecting rod to form a final bottom plate steel bar support system, completing the construction of the upper steel bar net piece and finally pouring the bottom plate concrete.

The invention has the beneficial effects that: the stress form of the steel bar attached to the circular bottom plate is applied, the problem that the traditional steel bar support needs to be welded and assembled on site, the site construction quality of a large amount of human resources is occupied, and the problem that the site construction quality cannot be guaranteed is solved, and the steel bar support has the advantages of reliable quality, quickness in installation, capability of being laid with a steel bar mesh and performing flow construction simultaneously, and the like.

Drawings

FIG. 1 is an overall view of a circular concrete floor rebar bracket system;

FIG. 2 is a diagram of an inner ring unit standard block;

FIG. 3 is a standard block diagram of an outer ring unit;

FIG. 4 is a schematic view of a modular unit module mechanically connected to a node by additional horizontal rods;

FIG. 5 is a schematic plan view of a bolster;

FIG. 6 is a schematic view of the cross-sectional arrangement of the pad beam and the pre-buried base;

fig. 7 is a schematic cross-sectional view of the adjustable shoe.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

In the embodiment, the designed thickness of a bottom plate of a certain ultra-deep shaft is 3.0 m, and the upper layer and the lower layer of the bottom plate steel bars are configured and divided into an inner ring and an outer ring. The inner ring steel bars are transverse and longitudinal steel bars with the central diameter of 20.1m, and the outer ring steel bars are composed of annular radial steel bars with the outer side of 9.5 m. The main upper reinforcing steel bar that influences the steel bar support atress, upper reinforcing steel bar net piece adopt the reinforcing steel bar net piece of 40 millimeters double-deck two-way diameters to constitute, simultaneously, consider the load that the production was stacked temporarily to reinforcing steel bar semi-manufactured goods in the work progress, conventional steel bar support (stirrup) will not satisfy the construction requirement far away.

In the embodiment, a circular concrete bottom plate steel bar support system (shown in figure 1) is adopted, and comprises two unit standard modules, namely an inner ring unit (shown in figure 2) and an outer ring unit (shown in figure 3); the inner ring units are correspondingly arranged in the form of orthogonal steel bar meshes; the outer ring units are correspondingly arranged in the radial and annular reinforcing mesh sheets.

The unit standard module comprises a horizontal stress rod 1, a vertical stress rod 2, a horizontal connecting rod 3, a stable connecting rod 4 and an adjustable base 5.

The first row of steel bars of the steel bar net piece from bottom to top are placed on the horizontal stress rods, the horizontal stress rods 1 are arranged orthogonally to the horizontal stress rods, and the horizontal stress rods 1 of the inner ring unit are arranged into a group of rods arranged in parallel due to the arrangement shape of the first row of steel bars of the steel bar net piece from bottom to top; the horizontal stress rods 1 of the outer ring unit are arranged into a group of rods arranged in a radial mode, virtual connecting lines in the radial direction of the rods intersect at the circle center of the circular bottom plate, and the horizontal stress rods 1 are used for directly bearing the weight of the steel bars and construction load.

Vertical stress bar 2 arranges under horizontal stress bar 1, and upper portion is connected with horizontal stress bar, and the lower part is connected 5 with adjustable base, and vertical stress bar 2 is used for the atress transmission, transmits the load of upper portion horizontal stress bar 1 to lower part adjustable base 5.

The horizontal connecting rods 3 are orthogonally connected with the horizontal stress rods 1, and the horizontal connecting rods 3 connect the plurality of horizontal stress rods 1 into a whole to form a unit standard module.

The stabilizing connecting rods 4 are commonly called as cross braces in some building engineering and are connected with the plurality of vertical stress rods 2 to form a whole, and the stability requirements of the unit standard modules are guaranteed by the arrangement of the stabilizing connecting rods 4.

As shown in fig. 7, the adjustable bottom support 5 comprises an embedded base 6 and an adjusting piece 7, the embedded base 6 is installed in a bottom plate cushion layer and used for installing and positioning the unit standard module and transmitting the load of the vertical stress rod 2 to the foundation, and the adjusting piece 7 is used for adjusting the level of the unit module and ensuring the installation accuracy.

The unit standard modules are prefabricated, the inner ring units are divided according to the horizontal distance, and the outer ring units are divided according to the circle center angle of the circular concrete bottom plate; meanwhile, the hoisting installation capacity needs to be considered in the division of the two units; the whole steel bar support system is connected into a final stress whole through an additional horizontal connecting rod 8, and the final stress whole is shown in figure 4. In the embodiment, the horizontal stress rods of the inner ring unit are 4.0 meters long and 2.0 meters apart, and the vertical stress rods are 2.0 meters apart; the length of the horizontal stress rod of the outer ring unit is 7.0 meters, the concentric angle is 8 degrees, and the distance between the vertical stress rods in the plane from inside to outside is 2.0 meters, 2.5 meters and 3.0 meters according to calculation. The unit standard module is installed and positioned by a 50-ton portal crane in a construction site, and the dead weight of the unit standard module meets the rated hoisting quality requirement of the crane after calculation and confirmation.

The construction method of the circular concrete bottom plate steel bar support system in the embodiment comprises the following construction steps:

firstly, after a foundation pit is excavated to a bottom plate construction design elevation, paving a layer of broken stone cushion layer 9, inserting a pre-embedded base 6 in a steel bar support system into soil to serve as an elevation control pile, and meanwhile, serving as a position positioning control point of the steel bar support system;

step two, pouring a plain concrete cushion layer on the gravel cushion layer, and pouring a concrete cushion beam 10 together, wherein the height of the cushion beam is equal to the thickness of the reinforced concrete protective layer on the soil facing surface of the reinforcing steel bars of the bottom plate as shown in figures 5 and 6; the width, position and shape of the pad beam are determined according to other conditions;

thirdly, laying a lower layer of steel bar mesh of the circular concrete bottom plate on the pad beam 10 in different areas, synchronously installing a standard module of the steel bar support, installing the standard module of the steel bar support in place in a hoisting mode, fixing the lower part of the vertical stress rod and the embedded base in a mechanical connection mode, and adjusting the horizontal precision of the support through an adjusting piece to ensure that the elevation of the upper layer of steel bar mesh and the overall stress of the steel bar support system are uniform;

after the local unit standard module is installed, fixing different module parts into a whole in a mechanical connection mode through an additional horizontal connecting rod; paving a circular concrete bottom plate upper layer steel bar net sheet on the finished steel bar support system;

step five, repeating the step three and the step four, ensuring synchronous flow construction of upper and lower layers of reinforcing steel bars of the bottom plate in a spatial three-dimensional plane, simultaneously reserving a unit module for final installation, and using the unit module as an upper and lower layer personnel channel during construction of the reinforcing steel bars of the bottom plate;

and step six, after the lower layer steel bars of the circular concrete bottom plate are qualified, installing the last unit module and the additional horizontal connecting rod to form a final bottom plate steel bar support system, completing the construction of the upper steel bar net piece and finally pouring the bottom plate concrete.

The invention is not the best known technology.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.