阅读说明：本技术 一种钢筋混凝土平面转体拱桥混凝土磨心施工方法 (Reinforced concrete plane turning arch bridge concrete grinding core construction method ) 是由 陈雁雁 沙建 胡文明 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种钢筋混凝土平面转体拱桥混凝土磨心施工方法,涉及钢筋混凝土技术领域。本发明包括磨心钢轴定位、磨心制作、磨心安装和磨心初磨,磨心钢轴定位包括以下步骤：步骤一：将磨心钢轴定位在下转盘第一次浇筑混凝土的预埋钢板上,步骤二：在浇筑第一次混凝土时利用全站仪准确定位预埋钢板的平面位置和高程,使平面位置偏差在±5mm范围内,高程控制在±2mm范围内。本发明通过在绑扎磨心顶层钢筋时带磨进行安装,严格控制磨心保护层厚度,进而使保护层厚度偏差只能存在正偏差,这样防止在磨心磨合过程中造成钢筋外露,使磨心和磨盖完全磨合,使转体段可以正常转动,避免转体不稳。(The invention discloses a reinforced concrete plane turning arch bridge concrete grinding core construction method, and relates to the technical field of reinforced concrete. The invention comprises grinding core steel shaft positioning, grinding core manufacturing, grinding core mounting and grinding core primary grinding, wherein the grinding core steel shaft positioning comprises the following steps: the method comprises the following steps: positioning the grinding core steel shaft on a pre-buried steel plate of the lower rotary table for pouring concrete for the first time, and performing the second step: and when the first concrete is poured, the total station is utilized to accurately position the plane position and the elevation of the embedded steel plate, so that the plane position deviation is within the range of +/-5 mm, and the elevation is controlled within the range of +/-2 mm. The invention carries out installation by the belt grinding when binding the top layer steel bar of the grinding core, strictly controls the thickness of the protective layer of the grinding core, and further ensures that the thickness deviation of the protective layer only has positive deviation, thereby preventing the steel bar from being exposed in the grinding process of the grinding core, completely grinding the grinding core and the grinding cover, ensuring that the rotary body section can normally rotate, and avoiding the instability of the rotary body.)

1. A reinforced concrete plane rotation arch bridge concrete grinding construction method comprises grinding steel shaft positioning, grinding manufacturing, grinding installation and grinding initial grinding, and is characterized in that: the positioning of the grinding core steel shaft comprises the following steps:

the method comprises the following steps: positioning the grinding core steel shaft on an embedded steel plate of the lower turntable for the first concrete pouring;

step two: accurately positioning the plane position and the elevation of the embedded steel plate by using a total station during the first concrete pouring, so that the plane position deviation is within the range of +/-5 mm, and the elevation is controlled within the range of +/-2 mm;

step three: after the concrete is solidified for the first time, chiseling the concrete around the grinding core reserved area, and then cleaning the reserved area;

step four: then, four longitudinal and transverse axis points are determined at the same distance on four sides of the embedded steel plate by using a total station;

step five: the grinding center steel shaft is adjusted to the center and kept vertical through a plumb bob;

step six: then, temporarily fixing the grinding core steel shaft and the embedded steel plate through spot welding by using short steel bars;

step seven: then, taking the lower turntable steel bars chiseled out from the edge of the hole wall as acting points, connecting the upper parts of the grinding core steel shafts by using three turn bolts, and screwing the turn bolts;

step eight: and after the position and the verticality of the grinding core steel shaft are checked to be accurate and correct by using a total station, welding the embedded steel plate and the grinding core steel shaft by using a steel batten plate.

2. The reinforced concrete plane swivel arch bridge concrete grinding core construction method according to claim 1, characterized in that: the grinding core manufacturing method comprises the following steps:

the method comprises the following steps: the spherical surface of the grinding core is formed by a bus device which is customized according to the designed spherical diameter, and the bus device is formed by welding a steel sleeve and a curved plate;

step two: the inner diameter of the steel sleeve is the same as the outer diameter of the grinding core steel shaft exposed out of the top surface of the spherical hinge, the outer layer of the curved plate is an arc-shaped steel plate, a screw is drilled on the surface of the curved plate, the inner layer of the curved plate is connected with the arc-shaped wood plate, the exposed surface of the arc-shaped wood plate is planed, and the curvature radius is the same as the radius of the curved surface of the spherical hinge;

step three: before concrete is poured in concrete operation, 3 pieces of phi 10 straight steel bars with the length of 10cm are cut, one end of each straight steel bar is polished smoothly, the straight steel bars are vertically adhered and welded on the outer wall of a grinding core steel shaft at an included angle of 120 degrees, and the polished end faces upwards and is as same as the top of the grinding core;

step four: when concrete is poured on the top surface of the grinding core, sleeving the bus plate on the grinding core steel shaft, slowly rotating the bus plate, firstly, rotatably cutting the concrete into a spherical surface shape, and then, roughly smearing the spherical surface to be smooth;

step five: and (5) after the concrete operation is finished and the surface of the spherical hinge is slightly dry, pressing and polishing the surface of the spherical hinge by using an iron trowel until the curved surface of the spherical hinge is smooth and round.

3. The reinforced concrete plane swivel arch bridge concrete grinding core construction method according to claim 1, characterized in that: the grinding core mounting comprises the following steps:

the method comprises the following steps: integrally binding and molding the grinding core steel bars, and then hoisting the grinding core steel bars to the grinding core position;

step two: then welding and connecting the radial reinforcing steel bars of the grinding core and the reserved connecting reinforcing steel bars of the lower turntable;

step three: then selecting an annular steel plate with the same inner diameter as the grinding center, ensuring that the concentric circle of the annular steel plate does not deform by adopting an inner supporting method, and installing and fixing the annular steel plate on the top surface of the lower turntable;

step four: accurately centering the annular steel plate by a total station cross centering method, so that the center of the annular steel plate is superposed with the center of the grinding center, and the error is controlled within 1 mm;

step five: the elevations of all the circumferential points of the annular steel plate are the same, and the steel plate and the embedded steel bars are welded and fixed after accurate adjustment.

4. The reinforced concrete plane swivel arch bridge concrete grinding core construction method according to claim 1, characterized in that: the grinding core primary grinding comprises the following steps:

the method comprises the following steps: when the grinding core concrete is initially set, sleeving the bus plate on the grinding core steel shaft, rotating the bus plate and grinding the grinding core by using a grinding machine;

step two: the grinding is based on a toothless steel saw blade with the thickness of 1mm which is uniformly moved between the bus plate and the surface of the grinding core;

step three: after the grinding reaches the standard, using a triangular oilstone to finely grind and smooth the rough part on the surface of the grinding core;

step four: after the grinding core concrete is finally set, drawing concentric circles on the grinding core at the same interval of 10cm by taking a grinding core steel shaft as the center, equally dividing the concentric circles into latitude and longitude lines on a grinding core spherical segment body according to a 10-degree central angle on the concentric circles, and repeatedly measuring the elevation of the intersection point of the same latitude by using a precise optical leveling instrument so as to check the curvature of each direction on the arc surface;

step five: and (4) manually polishing the non-smooth part on the arc surface until the elevation between every two points is controlled within +/-1 mm.

Technical Field

The invention belongs to the technical field of reinforced concrete, and particularly relates to a reinforced concrete plane turning arch bridge concrete grinding core construction method.

Background

The existing reinforced concrete grinding core construction method has certain defects, the existing reinforced concrete grinding core often has the defects that the grinding core and a grinding cover cannot be ground in the construction process, and finally, the driving force of a rotating body is increased, the rotating body is unstable, so that the rotating body section cannot rotate, and the application range is limited.

Disclosure of Invention

The invention aims to provide a reinforced concrete plane swivel arch bridge concrete grinding core construction method, which solves the existing problems: the existing reinforced concrete grinding core often cannot be ground into the grinding core and the grinding cover during construction, the driving force of a rotating body is increased, the rotating body is unstable, the rotating body section cannot rotate, and the application range is limited.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a reinforced concrete plane rotation arch bridge concrete grinding core construction method, which comprises grinding core steel shaft positioning, grinding core manufacturing, grinding core installation and grinding core primary grinding, wherein the grinding core steel shaft positioning comprises the following steps:

the method comprises the following steps: positioning the grinding core steel shaft on an embedded steel plate of the lower turntable for the first concrete pouring;

step two: accurately positioning the plane position and the elevation of the embedded steel plate by using a total station during the first concrete pouring, so that the plane position deviation is within the range of +/-5 mm, and the elevation is controlled within the range of +/-2 mm;

step three: after the concrete is solidified for the first time, chiseling the concrete around the grinding core reserved area, and then cleaning the reserved area;

step four: then, four longitudinal and transverse axis points are determined at the same distance on four sides of the embedded steel plate by using a total station;

step five: the grinding center steel shaft is adjusted to the center and kept vertical through a plumb bob;

step six: then, temporarily fixing the grinding core steel shaft and the embedded steel plate through spot welding by using short steel bars;

step seven: then, taking the lower turntable steel bars chiseled out from the edge of the hole wall as acting points, connecting the upper parts of the grinding core steel shafts by using three turn bolts, and screwing the turn bolts;

step eight: and after the position and the verticality of the grinding core steel shaft are checked to be accurate and correct by using a total station, welding the embedded steel plate and the grinding core steel shaft by using a steel batten plate.

Further, the grinding core manufacturing method comprises the following steps:

the method comprises the following steps: the spherical surface of the grinding core is formed by a bus device which is customized according to the designed spherical diameter, and the bus device is formed by welding a steel sleeve and a curved plate;

step two: the inner diameter of the steel sleeve is the same as the outer diameter of the grinding core steel shaft exposed out of the top surface of the spherical hinge, the outer layer of the curved plate is an arc-shaped steel plate, a screw is drilled on the surface of the curved plate, the inner layer of the curved plate is connected with the arc-shaped wood plate, the exposed surface of the arc-shaped wood plate is planed, and the curvature radius is the same as the radius of the curved surface of the spherical hinge;

step three: before concrete is poured in concrete operation, 3 pieces of phi 10 straight steel bars with the length of 10cm are cut, one end of each straight steel bar is polished to be smooth, the straight steel bars are vertically adhered and welded on the outer wall of a grinding core steel shaft at an included angle of about 120 degrees, and the polished end faces upwards and is as same as the top of the grinding core;

step four: when concrete is poured on the top surface of the grinding core, sleeving the bus plate on the grinding core steel shaft, slowly rotating the bus plate, firstly, rotatably cutting the concrete into a spherical surface shape, and then, roughly smearing the spherical surface to be smooth;

step five: and (5) after the concrete operation is finished and the surface of the spherical hinge is slightly dry, pressing and polishing the surface of the spherical hinge by using an iron trowel until the curved surface of the spherical hinge is smooth and round.

Further, the burr mounting comprises the steps of:

the method comprises the following steps: integrally binding and molding the grinding core steel bars, and then hoisting the grinding core steel bars to the grinding core position;

step two: then welding and connecting the radial reinforcing steel bars of the grinding core and the reserved connecting reinforcing steel bars of the lower turntable;

step three: then selecting an annular steel plate with the same inner diameter as the grinding center, ensuring that the concentric circle of the annular steel plate does not deform by adopting an inner supporting method, and installing and fixing the annular steel plate on the top surface of the lower turntable;

step four: accurately centering the annular steel plate by a total station cross centering method, so that the center of the annular steel plate is superposed with the center of the grinding center, and the error is controlled within 1 mm;

step five: the elevations of all the circumferential points of the annular steel plate are equal, and the steel plate and the embedded steel bars are welded and fixed after accurate adjustment.

Further, the grinding core primary grinding comprises the following steps:

the method comprises the following steps: when the grinding core concrete is initially set, sleeving the bus plate on the grinding core steel shaft, rotating the bus plate and grinding the grinding core by using a grinding machine;

step two: the grinding is based on the condition that a toothless steel saw blade with the thickness of 1mm can be uniformly moved between the bus plate and the surface of the grinding core;

step three: after the grinding reaches the standard, using a triangular oilstone to finely grind and smooth the rough part on the surface of the grinding core;

step four: after the grinding core concrete is finally set, drawing concentric circles on the grinding core at equal intervals of 10cm by taking a grinding core steel shaft as the center, equally dividing the concentric circles into latitude and longitude lines on a grinding core spherical segment body according to a 10-degree central angle on the concentric circles, and repeatedly measuring the elevation of the intersection point of the same latitude by using a precise optical leveling instrument so as to check the curvature of each direction on the arc surface;

step five: and (4) manually polishing the non-smooth part on the arc surface until the elevation between every two points is controlled within +/-1 mm.

The invention has the following beneficial effects:

1. the invention installs the grinding head when binding the top layer of the grinding core, strictly controls the thickness of the protective layer of the grinding core, and further ensures that the thickness deviation of the protective layer only has positive deviation, thereby preventing the reinforcing steel bar from being exposed in the grinding process of the grinding core, completely grinding the grinding core and the grinding cover, enabling the rotary section to normally rotate and avoiding the unstable rotation.

2. The distance between the reinforcing steel bars is strictly controlled in the process of installing the grinding core reinforcing steel bars, and meshes of the reinforcing steel bars between each layer of reinforcing steel bars are ensured to correspond, so that the vibrating rod can be placed below the grinding core to vibrate in the concrete pouring process, and the compactness of the grinding core concrete is ensured.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the installation and positioning of the steel spindle of the present invention;

FIG. 2 is a view of the construction of the bus bar apparatus of the present invention;

FIG. 3 is a schematic plan view of the elevation measurement of the grinding core according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-3, the invention relates to a reinforced concrete plane swivel arch bridge concrete grinding core construction method, which comprises grinding core steel shaft positioning, grinding core manufacturing, grinding core installation and grinding core primary grinding, wherein the grinding core steel shaft positioning comprises the following steps:

the method comprises the following steps: positioning the grinding core steel shaft on an embedded steel plate of the lower turntable for the first concrete pouring;

step two: accurately positioning the plane position and the elevation of the embedded steel plate by using a total station during the first concrete pouring, so that the plane position deviation is within the range of +/-5 mm, and the elevation is controlled within the range of +/-2 mm;

step three: after the concrete is solidified for the first time, chiseling the concrete around the grinding core reserved area, and then cleaning the reserved area;

step four: then, four longitudinal and transverse axis points are determined at the same distance on four sides of the embedded steel plate by using a total station;

step five: the grinding center steel shaft is adjusted to the center and kept vertical through a plumb bob;

step six: then, temporarily fixing the grinding core steel shaft and the embedded steel plate through spot welding by using short steel bars;

step seven: then, taking the lower turntable steel bars chiseled out from the edge of the hole wall as acting points, connecting the upper parts of the grinding core steel shafts by using three turn bolts, and screwing the turn bolts;

step eight: and after the position and the verticality of the grinding core steel shaft are checked to be accurate and correct by using a total station, welding the embedded steel plate and the grinding core steel shaft by using a steel batten plate.

The grinding core manufacturing method comprises the following steps:

the method comprises the following steps: the spherical surface of the grinding core is formed by a bus device which is customized according to the designed spherical diameter, and the bus device is formed by welding a steel sleeve and a curved plate;

step two: the inner diameter of the steel sleeve is the same as the outer diameter of the grinding core steel shaft exposed out of the top surface of the spherical hinge, the outer layer of the curved plate is an arc-shaped steel plate, a screw is drilled on the surface of the curved plate, the inner layer of the curved plate is connected with the arc-shaped wood plate, the exposed surface of the arc-shaped wood plate is planed, and the curvature radius is the same as the radius of the curved surface of the spherical hinge;

step three: before concrete is poured in concrete operation, 3 pieces of phi 10 straight steel bars with the length of 10cm are cut, one end of each straight steel bar is polished to be smooth, the straight steel bars are vertically adhered and welded on the outer wall of a grinding core steel shaft at an included angle of about 120 degrees, and the polished end faces upwards and is as same as the top of the grinding core;

step four: when concrete is poured on the top surface of the grinding core, sleeving the bus plate on the grinding core steel shaft, slowly rotating the bus plate, firstly, rotatably cutting the concrete into a spherical surface shape, and then, roughly smearing the spherical surface to be smooth;

step five: and (5) after the concrete operation is finished and the surface of the spherical hinge is slightly dry, pressing and polishing the surface of the spherical hinge by using an iron trowel until the curved surface of the spherical hinge is smooth and round.

The installation of the grinding core comprises the following steps:

the method comprises the following steps: integrally binding and molding the grinding core steel bars, and then hoisting the grinding core steel bars to the grinding core position;

step two: then welding and connecting the radial reinforcing steel bars of the grinding core and the reserved connecting reinforcing steel bars of the lower turntable;

step three: then selecting an annular steel plate with the same inner diameter as the grinding center, ensuring that the concentric circle of the annular steel plate does not deform by adopting an inner supporting method, and installing and fixing the annular steel plate on the top surface of the lower turntable;

step four: accurately centering the annular steel plate by a total station cross centering method, so that the center of the annular steel plate is superposed with the center of the grinding center, and the error is controlled within 1 mm;

step five: the elevations of all the circumferential points of the annular steel plate are equal, and the steel plate and the embedded steel bars are welded and fixed after accurate adjustment.

The grinding core primary grinding comprises the following steps:

the method comprises the following steps: when the grinding core concrete is initially set, sleeving the bus plate on the grinding core steel shaft, rotating the bus plate and grinding the grinding core by using a grinding machine;

step two: the grinding is based on the condition that a toothless steel saw blade with the thickness of 1mm can be uniformly moved between the bus plate and the surface of the grinding core;

step three: after the grinding reaches the standard, using a triangular oilstone to finely grind and smooth the rough part on the surface of the grinding core;

step four: after the grinding core concrete is finally set, drawing concentric circles on the grinding core at equal intervals of 10cm by taking a grinding core steel shaft as the center, equally dividing the concentric circles into latitude and longitude lines on a grinding core spherical segment body according to a 10-degree central angle on the concentric circles, and repeatedly measuring the elevation of the intersection point of the same latitude by using a precise optical leveling instrument so as to check the curvature of each direction on the arc surface;

step five: and (4) manually polishing the non-smooth part on the arc surface until the elevation between every two points is controlled within +/-1 mm.

Grinding steel bars are processed strictly according to a drawing, construction is carried out strictly according to the drawing in the steel bar installation process, the distance between the grinding steel bars is properly adjusted at the position where the lower turntable steel bars conflict with each other, the steel bars cannot be cut absolutely, the distance between the steel bars is strictly controlled in the grinding steel bar installation process, and the mesh of the steel bars between each layer of steel bars is ensured to correspond, so that a vibrating rod can be placed below the grinding center to vibrate in the concrete pouring process, the grinding concrete is ensured to be dense, grinding is carried out during binding of the top layer of the grinding center steel bars, the thickness of a protective layer of the grinding center is strictly controlled, the thickness deviation of the protective layer can only have positive deviation, the steel bars are prevented from being exposed in the grinding process, the grinding center and a grinding cover cannot be ground if the grinding steel bars are exposed, finally, the driving force of a rotating body is increased, the rotating body is unstable, and even the rotating body section cannot rotate, the swivel fails.

One specific application of this embodiment is: positioning a grinding steel shaft on an embedded steel plate of a lower turntable for the first concrete pouring, accurately positioning the plane position and the elevation of the embedded steel plate by using a total station when the first concrete is poured, ensuring that the plane position deviation is within a range of +/-5 mm and the elevation is controlled within a range of +/-2 mm, roughening concrete on the periphery of a reserved grinding area after the first concrete is solidified, cleaning the reserved area, then determining four longitudinal and transverse axis points by using the total station at the same distance on the four sides of the embedded steel plate, moving the grinding steel shaft forwards, backwards, leftwards and rightwards, adjusting the grinding steel shaft to the center, keeping the grinding steel shaft vertical by using a plumb bob, temporarily fixing the grinding steel shaft and the embedded steel plate by using short steel bars through spot welding, using a turntable steel bar on the side of a hole wall as an exposure force point, connecting three basket bolts with the upper part of the grinding steel shaft, screwing the basket bolts, checking the position and the perpendicularity of the grinding steel shaft by using the total station to be accurate, welding an embedded steel plate and a grinding core steel shaft by using a steel batten plate, forming the spherical surface of a grinding core by a bus device customized according to the designed spherical diameter, wherein the bus device is formed by welding a steel sleeve and a curved plate, the inner diameter of the steel sleeve is the same as the outer diameter of the grinding core steel shaft exposing the top surface of a spherical hinge, the outer layer of the curved plate is an arc-shaped steel plate, drilling a screw on the surface, connecting an arc-shaped wood plate at the inner layer, planing the exposed surface of the arc-shaped wood plate, the curvature radius is the same as the radius of the spherical hinge curved surface, cutting 3 phi 10 straight steel bars with the length of 10cm before concrete is poured in concrete operation, polishing one end of each straight steel bar, vertically welding the straight steel bars on the outer wall of the grinding core steel shaft at an included angle of about 120 degrees, enabling the polishing end to be upward and be the same as the top of the concrete grinding core, sleeving the bus plate on the grinding core steel shaft when the top surface of the concrete is poured, slowly rotating the bus plate, firstly spinning the concrete into a spherical surface shape, then smoothing the spherical surface, finishing the concrete operation, when the surface of the spherical hinge is slightly dry, rolling and press polishing the surface of the spherical hinge by using an iron trowel until the curved surface of the spherical hinge is smooth and smooth, integrally binding and forming a grinding center steel bar, hoisting the grinding center steel bar to the position of the grinding center, welding and connecting the radial steel bar of the grinding center with a reserved stub steel bar of a lower turntable, selecting an annular steel plate with the same inner diameter as the grinding center, ensuring that the concentric circle of the annular steel plate is not deformed by adopting an internal bracing method, installing and fixing the annular steel plate on the top surface of the lower turntable, accurately centering the annular steel plate by using a total station cross centering method, ensuring that the center of the annular steel plate is superposed with the center of the grinding center, controlling the error within 1mm, ensuring that the elevations of all points on the circumference of the annular steel plate are equal, welding and fixing the steel plate and an embedded steel bar after accurate adjustment, sleeving the bus plate on a grinding center steel shaft when the concrete of the grinding center is initially set, rotating the bus plate, grinding the grinding center by using a grinding machine, and grinding the grinding center so as to uniformly move a toothless steel saw blade with the thickness of 1mm between the bus plate and the surface of the grinding center, after grinding to reach the standard, using triangular oilstone to finely grind and smooth rough parts on the surface of the grinding core, after concrete of the grinding core is finally set, drawing concentric circles on the grinding core at equal intervals of 10cm by taking a steel shaft of the grinding core as the center, equally dividing the concentric circles into longitude and latitude lines on the defect body of the grinding core according to a central angle of 10 degrees on the concentric circles, repeatedly measuring the elevation of the intersection point of the same latitude by using a precise optical leveling instrument to check the curvature of each direction on the arc surface, and manually grinding the non-circular and non-smooth parts on the arc surface until the elevation between each two points is controlled within +/-1 mm.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.