CN108871149B - Reinforced concrete protective layer thickness measuring device and measuring method - Google Patents
Reinforced concrete protective layer thickness measuring device and measuring method Download PDFInfo
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- CN108871149B CN108871149B CN201810433687.6A CN201810433687A CN108871149B CN 108871149 B CN108871149 B CN 108871149B CN 201810433687 A CN201810433687 A CN 201810433687A CN 108871149 B CN108871149 B CN 108871149B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
- G01B5/066—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness of coating
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Abstract
The invention provides a device and a method for measuring the thickness of a reinforced concrete protective layer, belongs to the technical field of building measurement, can quickly measure the thickness of the concrete protective layer at the bottom of a reinforcement cage, and has high accuracy of a measurement result. The measuring device comprises a trolley which can pass between the bottom of the reinforcement cage and a bottom plate of the mould, and a vehicle-mounted measuring unit is arranged on the trolley; the vehicle-mounted measuring unit comprises a supporting plate fixedly connected to the trolley, a fixed block is fixedly connected to the position, close to the tail of the trolley, of the supporting plate, a lifting block capable of descending along the vertical direction and automatically rising under the compression of a steel bar at the bottom of the steel bar cage is further arranged on the supporting plate, and the lifting block is located between the fixed block and the head of the trolley; the top surface of elevator is the plane, and the elevator is seted up the inclined groove of groove face slope towards one side of fixed block, and fixed block fixedly connected with is used for measuring the gauge of the horizontal distance variable quantity between the groove face of fixed block and inclined groove in real time.
Description
Technical Field
The invention belongs to the technical field of building measurement, and particularly relates to a reinforced concrete protective layer thickness measuring device and a measuring method.
Background
When a reinforced concrete member is poured, a reinforcement cage is generally welded or bound, then the reinforcement cage is placed in a mold, a cushion block is padded between the bottom of the reinforcement cage and a mold bottom plate, a certain distance is reserved between the bottom of the reinforcement cage and the mold bottom plate, and then concrete is poured. The part between outmost reinforcing bar outward flange and the concrete surface is the concrete protection layer, through the thickness of control concrete protection layer, can guarantee to pour the quality, avoids the exposed risk of reinforcing bar.
Currently, the thickness of the concrete protective layer at the bottom of the steel reinforcement cage is measured manually by a vernier caliper. However, this manual measurement method has low measurement efficiency, and when the reinforcing bars are arranged densely, the measurement is very inconvenient.
Therefore, how to measure the thickness of the concrete protective layer at the bottom of the reinforcement cage simply, conveniently and quickly is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the defects of low measurement efficiency and inconvenient measurement in the process of measuring the thickness of the concrete protective layer at the bottom of the steel reinforcement cage, the invention provides the device and the method for measuring the thickness of the concrete protective layer at the bottom of the steel reinforcement cage, the device and the method can be used for quickly measuring the thickness of the concrete protective layer at the bottom of the steel reinforcement cage, and the accuracy of the measurement result is high.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a reinforced concrete protective layer thickness measuring device, which is used for measuring the thickness of a concrete protective layer at the bottom of a reinforcement cage and comprises a trolley, wherein the trolley can pass between the bottom of the reinforcement cage and a mold bottom plate, and a vehicle-mounted measuring unit is arranged on the trolley; the vehicle-mounted measuring unit comprises a supporting plate fixedly connected to the trolley, a fixed block is fixedly connected to the position, close to the tail of the trolley, of the supporting plate, a lifting block capable of descending along the vertical direction and automatically rising under the pressure of reinforcing steel bars at the bottom of the reinforcement cage is further arranged on the supporting plate, and the lifting block is located between the fixed block and the head of the trolley; the top surface of the lifting block is a plane, one side of the lifting block, facing the fixed block, is provided with an inclined groove surface, and the fixed block is fixedly connected with a measuring meter which is used for measuring the horizontal distance variation between the fixed block and the groove surface of the inclined groove in real time.
Preferably, the measuring meter is a dial indicator or a dial indicator, a measuring rod of the dial indicator or the dial indicator extends out towards the lifting block along the horizontal direction, and the end of the measuring rod abuts against the groove surface of the inclined groove.
Preferably, the lifting block is fixedly connected to the supporting plate through an elastic piston, the elastic piston is arranged along the vertical direction, the upper end of the elastic piston is embedded into the lifting block, and the lower end of the elastic piston is fixedly connected to the supporting plate.
Preferably, the elastic piston comprises a piston cylinder, a piston column matched with the piston cylinder and a spring; the piston cylinder is embedded into the lifting block, the upper end of the piston column is sleeved in the piston cylinder, and the lower end of the piston column is fixedly connected to the supporting plate; the spring is arranged in the piston cylinder and supported between the piston cylinder and the piston column.
Preferably, one surface of the lifting block facing the trolley head is an inclined surface; the inclined plane of the lifting block forms an included angle of 135 degrees with the advancing direction of the trolley.
Preferably, an included angle between the groove surface of the inclined groove and the traveling direction of the trolley is 45 degrees or 135 degrees.
Preferably, the reinforced concrete protective layer thickness measuring device further comprises a supporting plate lifting member for adjusting the mounting height of the supporting plate, and the supporting plate is fixedly connected to the trolley through the supporting plate lifting member.
Preferably, the supporting plate lifting piece comprises a connecting column which penetrates through the supporting plate in the vertical direction, the lower end of the connecting column is welded on the trolley, external threads are arranged on the periphery of the connecting column, the connecting column is in threaded connection with an upper adjusting nut and a lower adjusting nut, and the upper adjusting nut and the lower adjusting nut are respectively abutted to the upper surface and the lower surface of the supporting plate.
Preferably, the supporting plate is provided with a level gauge.
The invention also provides a method for measuring the thickness of the reinforced concrete protective layer by using the reinforced concrete protective layer thickness measuring device in any technical scheme, which comprises the following steps:
moving the trolley to enable the trolley to carry the vehicle-mounted measuring unit to pass through the space between the bottom of the reinforcement cage and the bottom plate of the mold; when the trolley passes through the steel bars at the bottom of the steel bar cage, the lifting block descends along the vertical direction under the pressure of the steel bars; when the lifting block is separated from the compression of the steel bar, the lifting block automatically rises; when the lifting block descends and ascends, the measuring meter measures the variation of the horizontal distance between the fixed block and the groove surface of the inclined groove in real time; calculating the thickness of the reinforced concrete protective layer by the following calculation formula:
Si＝H-Xim|tanα|
wherein S isiThe thickness of the concrete protective layer of the ith steel bar at the bottom of the steel reinforcement cage is determined; h is the height between the top surface of the lifting block and the bottom plate of the mold at the beginning; ximα is the included angle between the groove surface of the inclined groove and the advancing direction of the trolley, and the fixed block is the maximum variation of the horizontal distance between the fixed block and the groove surface of the inclined groove measured by the measuring meter when the steel bar passes through the ith steel bar.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. according to the reinforced concrete protective layer thickness measuring device provided by the invention, the thickness of the concrete protective layer corresponding to the series of steel bars at the bottom of the steel reinforcement cage can be measured by the trolley which passes through the space between the bottom of the steel reinforcement cage and the bottom plate of the mould in one travel through the trolley and the vehicle-mounted measuring unit, so that the thickness of the concrete protective layer at the bottom of the steel reinforcement cage can be quickly measured, and the measuring efficiency is high;
2. the reinforced concrete protective layer thickness measuring device provided by the invention has the advantages of simple structure, wide application range and high accuracy of the measuring result.
Drawings
Fig. 1 is a front view of a reinforced concrete protective layer thickness measuring apparatus according to an embodiment of the present invention;
FIG. 2 is a top view of a reinforced concrete protective layer thickness measuring apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an elastic piston according to an embodiment of the present invention;
FIG. 4 is a front view of a first lift block provided in accordance with an embodiment of the present invention;
FIG. 5 is a top view of a first lifting block according to an embodiment of the present invention;
FIG. 6 is a front view of a second lift block provided in accordance with an embodiment of the present invention;
FIG. 7 is a top view of a second lift block provided in accordance with an embodiment of the present invention;
FIG. 8 is a front view of a third elevator block provided in accordance with an embodiment of the present invention;
FIG. 9 is a top view of a third elevator block provided in accordance with an embodiment of the present invention;
FIG. 10 is a diagram illustrating a variation of the horizontal distance between the elevator block and the groove surface of the inclined groove according to an embodiment of the present invention;
FIG. 11 is a schematic diagram illustrating the calculation of the thickness of the armored concrete protective layer when the thickness of the armored concrete protective layer is measured by using the thickness measuring apparatus for the armored concrete protective layer according to the embodiment of the present invention;
in the above figures: 1. a trolley; 11. a headstock; 12. a wheel; 13. a vehicle bottom plate; 2. a support plate; 3. a fixed block; 4. a measuring meter; 5. a lifting block; 51. an inclined groove; 52. an insertion hole; 6. an elastic piston; 61. a piston cylinder; 62. a spring; 63. a piston post; 7. a pallet lift; 71. an upper adjusting nut; 72. a lower adjusting nut; 73. connecting columns; 8. a level gauge; 9. reinforcing steel bars; 10. and (4) a die bottom plate.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the vertical direction refers to the up-down direction in fig. 1, and the horizontal direction refers to the left-right direction in fig. 1; the terms "inner", "outer", "upper", "lower", "front", "rear", and the like, indicate orientations or positional relationships based on the positional relationships shown in fig. 1, are merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the invention relates to a reinforced concrete protective layer thickness measuring device, which is used for measuring the thickness of a concrete protective layer at the bottom of a reinforcement cage, and comprises a trolley 1 which can pass between the bottom of the reinforcement cage and a mould bottom plate 10, wherein a vehicle-mounted measuring unit is arranged on the trolley 1; the vehicle-mounted measuring unit comprises a supporting plate 2 fixedly connected to the trolley 1, a fixed block 3 is fixedly connected to the position, close to the tail of the trolley 1, of the supporting plate 2, a lifting block 5 capable of descending in the vertical direction and automatically rising under the compression of a steel bar 9 at the bottom of the steel bar cage is further arranged on the supporting plate 2, and the lifting block 5 is located between the fixed block 3 and a head 11 of the trolley 1; the top surface of the lifting block 5 is a plane, and one side of the lifting block 5 facing the fixed block 3 is provided with an inclined groove 51 with an inclined groove surface, so that the height change of the lifting block 5 is converted into the change of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51; the fixed block 3 is fixedly connected with a measuring gauge 4 for measuring the variation of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 in real time.
It should be noted that the reinforced concrete protective layer thickness measuring device is used for measuring the thickness of the concrete protective layer at the bottom of the reinforcement cage before the concrete is poured, that is, measuring the distance between the outer edge of the reinforcement 9 at the bottom of the reinforcement cage and the mold bottom plate 10, and is used for controlling the thickness of the concrete protective layer after the concrete is poured, so as to ensure the pouring quality and avoid the risk of exposing the reinforcement 9.
In the above reinforced concrete protective layer thickness measuring device, the trolley 1 is used for driving the vehicle-mounted measuring unit to pass through between the bottom of the reinforcement cage and the mold bottom plate 10, the specific structure of the trolley 1 in this embodiment is not specifically limited, and the trolley 1 may be applicable as long as it can drive the vehicle-mounted measuring unit to pass through between the bottom of the reinforcement cage and the mold bottom plate 10, for example: as shown in fig. 1, the trolley 1 may include a head 11, wheels 12 and a floor 13, the floor 13 is pulled by the head 11 and may be used to mount a vehicle-mounted measuring unit, the trolley 1 may further include a power device, a steering device, a control response device, etc. to remotely control the trolley 1 to travel, the trolley 1 may also be provided with no power device, and the trolley 1 is controlled to travel by pulling a traction rope.
In the reinforced concrete protective layer thickness measuring device, the vehicle-mounted measuring unit is used for acquiring the distance between the outer edge of each steel bar 9 at the bottom of the steel bar cage and the bottom plate 10 of the mould in the process of the travelling of the trolley 1. Along with the marching of dolly 1, when elevator 5 runs into reinforcement cage bottom reinforcing bar 9, elevator 5 can descend along vertical direction under the oppression of this reinforcing bar 9, because the top surface of elevator 5 is the plane, when the top surface of elevator 5 was located the reinforcing bar 9 below, elevator 5 no longer descends, the height that this moment elevator 5 top surface apart from mould bottom plate 10 is the concrete protective layer thickness of this reinforcing bar 9, therefore, will be initial the height that elevator 5 top surface apart from mould bottom plate 10 makes a difference with the biggest descending height of elevator 5, can obtain the numerical value of the concrete protective layer thickness that this reinforcing bar 9 corresponds. Furthermore, the side of the lifting block 5 facing the fixed block 3 is provided with an inclined groove 51 with an inclined groove surface, so that the height change of the lifting block 5 can be converted into the change of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51, and the change quantity of the change quantity is measured by the arranged measuring meter 4, therefore, the thickness of the reinforced concrete protective layer can be obtained by conversion according to the measurement data of the measuring meter 4.
It should be noted that, in order to ensure that the lifting block 5 can descend under the compression of the steel bars 9 and ensure that the trolley 1 can carry the vehicle-mounted measuring unit to pass between the bottom of the steel bar cage and the mold base plate 10, the height from the top surface of the lifting block 5 to the mold base plate 10 needs to be greater than the height from the bottom of the steel bar cage to the mold base plate 10 at the beginning, and when the lifting block 5 is lowered to the lowest, the height from the top surface of the lifting block 5 to the mold base plate 10 needs to be less than or equal to the height from the bottom of the steel bar cage to the mold base plate 10.
In a specific embodiment, as shown in fig. 1 and 2, the measuring gauge 4 is a dial indicator or a dial indicator, a measuring rod of the dial indicator or the dial indicator extends out towards the lifting block 5 along the horizontal direction, and the end of the measuring rod is abutted against the groove surface of the inclined groove 51. When the lifting block 5 descends or rises, the measuring rod automatically stretches, the end part of the measuring rod slides up and down along the groove surface of the inclined groove 51, and then the change quantity of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 can be obtained according to the stretching quantity of the measuring rod of the dial indicator or the dial indicator. It should be noted that the dial indicator and the dial indicator are gauge-type general length measuring tools manufactured by using a precision rack and pinion mechanism, the structure and the use of which are well known to those skilled in the art, and detailed description is omitted here, and those skilled in the art can select a dial indicator or a dial indicator with a suitable measuring range. Meanwhile, according to the common knowledge in the field, the measuring rod of the dial indicator or the dial indicator is automatically telescopic, so that the change of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 can be measured in real time through the dial indicator or the dial indicator when the lifting block 5 descends or returns, and when the dial indicator or the dial indicator is installed, the measuring rod of the dial indicator or the dial indicator needs to be pre-compressed for a certain range to ensure that the measuring rod can be automatically telescopic. It will be appreciated that other gauges 4 may be used by those skilled in the art, as long as the amount of change in the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 can be measured. In addition, in order to record the reading of the measuring meter 4 in real time, the measuring meter 4 is electrically connected with a reading recording device, and the reading recording device can be installed in the fixed block 3; further, the reading recording device can be also connected with a data transmitter to transmit data to a handheld device of the detection personnel or transmit the data to a network. The specific structure of the reading recording device and the data transmitter is not limited in the embodiments of the present invention, and those skilled in the art can select from reading recording devices and data transmitters commonly used in the art.
In order to facilitate the lifting of the lifting block 5, in a specific embodiment, as shown in fig. 1, the lifting block 5 is fixedly connected to the supporting plate 2 through an elastic piston 6, the elastic piston 6 is disposed along a vertical direction, an upper end of the elastic piston 6 is embedded into the lifting block 5, and a lower end of the elastic piston 6 is fixedly connected to the supporting plate 2. Further, as shown in fig. 3, the specific structure of the elastic piston 6 is as follows: the elastic piston 6 includes a piston cylinder 61, a piston post 63 matching with the piston cylinder 61, and a spring 62; the piston cylinder 61 is embedded into the lifting block 5, the upper end of the piston column 63 is sleeved in the piston cylinder 61, and the lower end of the piston column 63 is fixedly connected to the supporting plate 2; the spring 62 is disposed in the piston cylinder 61, one end of the spring 62 abuts against the top surface of the piston cylinder 61, and the other end of the spring 62 abuts against the upper end of the piston post 63 to be supported between the piston cylinder 61 and the piston post 63. It will be appreciated that the resilient piston 6 may be of any suitable configuration, as long as it is capable of extending and retracting in a vertical direction.
The structure of the elevator block 5 is described in detail below in three specific embodiments:
fig. 4 and 5 show the structure of the first lifting block 5, the surface of the lifting block 5 facing the headstock 11 of the trolley 1 is an inclined surface, when the inclined surface is contacted with the steel bars 9 at the bottom of the steel bar cage, the acting force of the steel bars 9 on the inclined surface has component force in the vertical direction, and the lifting block 5 is easier to be pressed down under the action of the component force. Preferably, the angle between the inclined surface of the lifting block 5 and the travelling direction of the trolley 1 is 135 °. Furthermore, the side of the lifting block 5 facing the fixed block 3 is provided with an inclined groove 51 with an inclined groove surface, the inclined groove 51 can convert the height change of the lifting block 5 into the change of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51, for the convenience of conversion, preferably, the included angle between the groove surface of the inclined groove 51 and the advancing direction of the trolley 1 is 45 degrees, when the lifting block 5 descends, the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 becomes larger, at this time, the maximum change amount of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 measured by the measuring meter 4 is the maximum height of the lifting block 5. Further, as shown in fig. 5, the middle portion of the lift block 5 is provided with an insertion hole 52 for inserting the elastic piston 6, and the insertion hole 52 is located between the inclined groove 51 and the inclined surface.
Fig. 6 and 7 show the structure of the second lifting block 5, which differs from the structure of the first lifting block 5 in that: the included angle between the groove surface of the inclined groove 51 and the advancing direction of the trolley 1 is 135 degrees, when the lifting block 5 descends, the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 is reduced, and at the moment, the maximum variation of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51, which is measured by the measuring meter 4, is the maximum descending height of the lifting block 5. By providing the inclined groove 51 in this manner, the elevator block 5 can be reduced in size compared to the elevator block 5 of the first type. After the inclined groove 51 is provided in this manner, as shown in fig. 7, the insertion hole 52 is provided on one side of the inclined groove 51.
Fig. 8 and 9 show a third lifter block 5 structure, which is different from the second lifter block 5 structure in that: as shown in fig. 9, the insertion holes 52 are provided on both sides of the inclined groove 51, and the insertion holes 52 are provided so that the balance when the elevator block 5 is lowered after the elastic piston 6 is inserted can be secured.
In addition, as shown in fig. 1, the reinforced concrete protective layer thickness measuring device further comprises a supporting plate lifting member 7 for adjusting the installation height of the supporting plate 2, and the supporting plate 2 is fixedly connected to the trolley 1 through the supporting plate lifting member 7. When the height from the top surface of the lifting block 5 to the die bottom plate 10 is smaller than the height from the bottom of the steel bar cage to the die bottom plate 10 at the beginning, the mounting height of the supporting plate 2 is adjusted through the supporting plate lifting piece 7, so that the height of the whole vehicle-mounted measuring unit can be increased, the height from the top surface of the lifting block 5 to the die bottom plate 10 is larger than the height from the bottom of the steel bar cage to the die bottom plate 10, and the application range of the reinforced concrete protective layer thickness measuring device is widened. Specifically, as shown in fig. 1, the supporting plate lifting member 7 includes a connecting column 73 penetrating through the supporting plate 2 in the vertical direction, the lower end of the connecting column 73 is welded to the trolley 1, an external thread is arranged on the periphery of the connecting column 73, an upper adjusting nut 71 and a lower adjusting nut 72 are connected to the periphery of the connecting column 73 in a threaded manner, and the upper adjusting nut 71 and the lower adjusting nut 72 respectively abut against the upper surface and the lower surface of the supporting plate 2. It should be noted that, as shown in fig. 2, the pallet lifting members 7 are distributed at four corners of the pallet 2. Further, in order to make the pallet 2 fall on the trolley completely, as shown in fig. 1, the pallet 2 is provided with a pallet lifting member 7 having a groove for receiving the lower adjusting nut 72. Further, as shown in fig. 2, preferably, a level 8 is further provided on the pallet 2. When the height of the pallet 2 is adjusted, the upper adjusting nut 71 is loosened, and the lower adjusting nut 72 is further rotated, so that the lower adjusting nut 72 moves up and down along the connecting column 73 to a predetermined position, the pallet 2 moves up and down along with the lower adjusting nut 72, and then the upper adjusting nut 71 is tightened, and the pallet 2 is clamped by the upper adjusting nut 71 and the lower adjusting nut 72, so that the pallet 2 is fixed at the predetermined position. In the adjusting process, the level meter 8 is observed in real time to balance and adjust the supporting plate lifting pieces 7 positioned at four corners, so that the level of the supporting plate 2 is ensured.
The embodiment of the invention also provides a method for measuring the thickness of the reinforced concrete protective layer by using the reinforced concrete protective layer thickness measuring device, which comprises the following steps:
moving the trolley 1 to enable the trolley 1 to carry the vehicle-mounted measuring unit to pass between the bottom of the steel reinforcement cage and the die bottom plate 10; when the trolley 1 passes through the steel bars 9 at the bottom of the steel bar cage, the lifting block 5 descends along the vertical direction under the pressure of the steel bars 9; when the lifting block is separated from the pressing of the steel bar 9, the lifting block 5 automatically rises; while the lifting block 5 descends and ascends, the measuring gauge 4 measures the variation of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 in real time, as shown in fig. 10; and (3) calculating the thickness of the reinforced concrete protective layer, wherein a calculation schematic diagram is shown in FIG. 11, and the calculation formula is as follows:
Si＝H-Hi＝H-Xim|tanα|
wherein S isiThe thickness of the concrete protective layer of the ith steel bar 9 at the bottom of the steel reinforcement cage is set; h is the height between the top surface of the lifting block 5 and the bottom plate 10 of the mould at the beginning; hiThe maximum descending amount of the lifting block 5 when the steel bar passes through the ith steel bar 9; ximThe maximum variation of the horizontal distance between the fixed block 3 and the groove surface of the inclined groove 51 measured by the measuring meter 4 when the steel bar 9 passes through the ith steel bar, α is the included angle between the groove surface of the inclined groove 51 and the traveling direction of the trolley 1, wherein S isiH and XimThe unit of (A) is uniform length unit, and can be m, cm or mm.
According to the reinforced concrete protective layer thickness measuring device provided by the invention, the thickness of the concrete protective layer corresponding to the series of steel bars 9 at the bottom of the steel reinforcement cage can be measured by the trolley 1 which passes through the position between the bottom of the steel reinforcement cage and the mold bottom plate 10 in one travel through the trolley 1 and the vehicle-mounted measuring unit, so that the thickness of the concrete protective layer at the bottom of the steel reinforcement cage can be rapidly measured, and the measuring efficiency is high. Meanwhile, the reinforced concrete protective layer thickness measuring device provided by the invention is simple in structure, wide in application range and high in accuracy of measuring results.
Claims (10)
1. Reinforced concrete protective layer thickness measuring device for measure the thickness of reinforcement cage bottom concrete protective layer, its characterized in that: the device comprises a trolley (1) capable of passing between the bottom of a reinforcement cage and a mold bottom plate (10), wherein a vehicle-mounted measuring unit is mounted on the trolley (1); the vehicle-mounted measuring unit comprises a supporting plate (2) fixedly connected to the trolley (1), a fixed block (3) is fixedly connected to the position, close to the tail of the trolley (1), of the supporting plate (2), a lifting block (5) capable of descending in the vertical direction and automatically rising under the pressure of a steel bar (9) at the bottom of the steel bar cage is further arranged on the supporting plate (2), and the lifting block (5) is located between the fixed block (3) and the head of the trolley (1); the top surface of the lifting block (5) is a plane, one surface of the lifting block (5) facing the head of the trolley (1) is an inclined surface, one side of the lifting block (5) facing the fixed block (3) is provided with an inclined groove (51) with an inclined groove surface, and the fixed block (3) is fixedly connected with a measuring meter (4) for measuring the horizontal distance variation between the fixed block (3) and the groove surface of the inclined groove (51) in real time;
the formula for calculating the thickness of the reinforced concrete protective layer is as follows:
Si＝H-Xim|tanα|
wherein S isiThe thickness of the concrete protective layer of the ith steel bar (9) at the bottom of the steel reinforcement cage is determined; h is the height between the top surface of the lifting block (5) and the die bottom plate (10) at the beginning; ximThe maximum variation of the horizontal distance between the fixed block (3) and the groove surface of the inclined groove (51) measured by the measuring meter (4) when the steel bar (9) passes through the ith steel bar, and α is the included angle between the groove surface of the inclined groove (51) and the advancing direction of the trolley (1).
2. The reinforced concrete protective layer thickness measuring device according to claim 1, wherein: the measuring instrument (4) is a dial indicator or a dial indicator, a measuring rod of the dial indicator or the dial indicator extends out towards the lifting block (5) along the horizontal direction, and the end part of the measuring rod is abutted against the groove surface of the inclined groove (51).
3. The reinforced concrete protective layer thickness measuring device according to claim 1, wherein: the lifting block (5) is fixedly connected with the supporting plate (2) through an elastic piston (6), the elastic piston (6) is arranged along the vertical direction, the upper end of the elastic piston (6) is embedded into the lifting block (5), and the lower end of the elastic piston (6) is fixedly connected with the supporting plate (2).
4. The reinforced concrete protective layer thickness measuring device according to claim 3, wherein: the elastic piston (6) comprises a piston cylinder (61), a piston column (63) matched with the piston cylinder (61), and a spring (62); the piston cylinder (61) is embedded into the lifting block (5), the upper end of the piston column (63) is sleeved in the piston cylinder (61), and the lower end of the piston column (63) is fixedly connected to the supporting plate (2); the spring (62) is disposed within the piston cylinder (61) and supported between the piston cylinder (61) and the piston post (63).
5. The reinforced concrete protective layer thickness measuring device according to claim 1, wherein: the included angle between the inclined plane of the lifting block (5) and the advancing direction of the trolley (1) is 135 degrees.
6. The reinforced concrete protective layer thickness measuring device according to claim 1, wherein: the included angle between the groove surface of the inclined groove (51) and the advancing direction of the trolley (1) is 45 degrees or 135 degrees.
7. The reinforced concrete protective layer thickness measuring device according to claim 1, wherein: the reinforced concrete protective layer thickness measuring device further comprises a supporting plate lifting piece (7) used for adjusting the mounting height of the supporting plate (2), and the supporting plate (2) is fixedly connected to the trolley (1) through the supporting plate lifting piece (7).
8. The reinforced concrete protective layer thickness measuring device according to claim 7, wherein: the supporting plate lifting piece (7) comprises a connecting column (73) penetrating through the supporting plate (2) in the vertical direction, the lower end of the connecting column (73) is welded to the trolley (1), external threads are arranged on the periphery of the connecting column (73), an upper adjusting nut (71) and a lower adjusting nut (72) are connected to the connecting column (73) through threads, and the upper adjusting nut (71) and the lower adjusting nut (72) are respectively abutted to the upper surface and the lower surface of the supporting plate (2).
9. The reinforced concrete protective layer thickness measuring device according to claim 7 or 8, wherein: the supporting plate (2) is provided with a level gauge (8).
10. A method for measuring the thickness of a reinforced concrete cover layer using the reinforced concrete cover layer thickness measuring device according to any one of claims 1 to 9, comprising the steps of:
moving the trolley (1) to enable the trolley (1) to carry the vehicle-mounted measuring unit to pass between the bottom of the reinforcement cage and a mold bottom plate (10); when the trolley (1) passes through the steel bars (9) at the bottom of the steel bar cage, the lifting block (5) descends along the vertical direction under the pressure of the steel bars (9); when the lifting block is separated from the pressing of the steel bar (9), the lifting block (5) automatically rises; the measuring meter (4) measures the variation of the horizontal distance between the fixed block (3) and the groove surface of the inclined groove (51) in real time while the lifting block (5) descends and ascends; calculating the thickness of the reinforced concrete protective layer by the following calculation formula:
Si＝H-Xim|tanα|
wherein S isiThe thickness of the concrete protective layer of the ith steel bar (9) at the bottom of the steel reinforcement cage is determined; h is the height between the top surface of the lifting block (5) and the die bottom plate (10) at the beginning; ximThe maximum variation of the horizontal distance between the fixed block (3) and the groove surface of the inclined groove (51) measured by the measuring meter (4) when the steel bar (9) passes through the ith steel bar, and α is the included angle between the groove surface of the inclined groove (51) and the advancing direction of the trolley (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201514182U (en) * | 2009-11-05 | 2010-06-23 | 中国建筑第五工程局有限公司 | Multifunctional cast-in-situ floor slab concrete thickness detector |
| US9291441B2 (en) * | 2012-02-21 | 2016-03-22 | H. Houston Spear, IV | Concrete deck measuring device |
| CN202885772U (en) * | 2012-07-18 | 2013-04-17 | 贾卫兵 | Reinforced concrete protection layer thickness detector |
| CN104101288A (en) * | 2014-08-04 | 2014-10-15 | 中国建筑材料科学研究总院 | Device for measuring concrete surface stripping degree |
| CN104359391B (en) * | 2014-12-12 | 2017-01-25 | 张卫东 | Detecting device for reinforced concrete protective layer measurer and floor thickness measurer |
| CN106323130A (en) * | 2016-10-09 | 2017-01-11 | 广东省源天工程有限公司 | Concrete reinforcement cover pre-detection tool for beam, column and wall |
| CN206479124U (en) * | 2017-03-07 | 2017-09-08 | 中铁城建集团第一工程有限公司 | Roof steel bar protective layer thickness detects instrument |
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