WO2002002890A1

WO2002002890A1 - Apparatus and method for setting horizontal state of bottom plane

Info

Publication number: WO2002002890A1
Application number: PCT/KR2001/001090
Authority: WO
Inventors: Khang-Shic Kim; Jea-Kwan Kim
Original assignee: Kim Khang Shic; Kim Jea Kwan
Priority date: 2000-07-03
Filing date: 2001-06-26
Publication date: 2002-01-10
Also published as: AU2001266395A1

Abstract

Disclosed is an apparatus and method for setting a horizontal state of a bottom plane, the apparatus including lower plates being fixed on a slab mold and each having a guide screw upwardly fixed on a center surface thereof, an upper plate being disposed on an upper part of the guide screw and forming a reference height to which a cement mortar is filled, and a height setting unit for setting the reference height so as for the upper plate to be positioned at the guide screw at the reference height to which the cement mortar is filled. The apparatus for setting the horizontal state of the bottom plane according to the present invention is capable of achieving the level bottom plane at a point of filling the cement mortar, since a nut disposed on the guide screw is settable at an uniform height by means of the height setting unit. Hence, the present invention has an advantage of ensuring a stable construction of multi-story buildings, roads, or the likes.

Description

APPARATUS AND METHOD FOR SETTING HORIZONTAL STATE OF BOTTOM PLANE

Technical field

The present invention generally relates to an apparatus and method for setting a horizontal state of a bottom plane, and in particular to an apparatus and method for setting a horizontal state of a bottom plane, which helps to achieve a stable construction of concrete buildings and roads by sensing a laser beam emitted from an existing laser beam injector and automatically setting the horizontal state of the bottom plane based on the sensed result.

Background art

In general, a conventional method for constructing a structure in a construction site is characterized in performing the steps of measuring a reference height at a horizontal state by referring to a central position of a bubble generated on a glass tube inside which a liquid is sealed, positioning the structure by means of a thread or a steel wire to be at a level with the measured reference height, laying bricks or timbers in parallel based on the level plane and the horizontal line. In an attempt to set a vertical line, the conventional method requires the steps of suspending a weight with a string to set a reference height at a vertical state and erecting pillars based on the reference height.

In this manner, the conventional art achieves a balanced state of the structure. The conventional horizontal and vertical state measuring devices include a horizontal state indicator(level gauge), which measures the horizontal state by measuring the position of the bubble within the liquid tube with the naked eye as shown in FIG. 1, and a vertical indicator, which measures the vertical state by suspending the weight with the string and making the string and weight forming the vertical line by virtue of gravity.

It is no exaggeration to say that the balance of the structure under construction is determined during an initial course of setting the horizontal state of the bottom plane, since a stable construction of the structure and any roads cannot be ensured unless the bottom plane is not balanced as a whole.

By way of example, a method for constructing a concrete structure, such as a multi-story building or the likes, is performed by initially installing a mold, and arranging iron bars, and filling a cement mortar in an inside and a bottom surface of the mold. At this time, the mold should be installed at an exact height and at an exact horizontal state to stably construct the whole structure.

The horizontal string was often used to install the mold. But, the current trend is directed to maintaining the whole horizontal state by simply adjusting heights of horizontal supports on a slab mold. To be specific, the horizontal state is maintained by fixing the horizontal supports in the vicinity of an upper surface of the slab mold, arranging the bars, and filling the concrete mortar.

The method, however, has a disadvantage of failing to exactly set the horizontal state of the slab, since the concrete slab is formed according to the heights of the plurality of horizontal supports which are installed on the slab mold. For the reason, the method has problems that the mold, which is installed on the horizontal supports, cannot be surely installed at the exact vertical and horizontal state and workability is deteriorated and work period is prolonged.

This is basically because that it is difficult to exactly set positions of the plurality of horizontal supports when being installed.

Also, since the thread, the weight, the horizontal state indicator, the measuring meter, etc., should be used to set the horizontal state and the vertical state in such a site as a construction site, a civil-engineering site, a shipbuilding site where a large structure is welded, a large sculpture and art work place, etc., there is needed more time consumption and laborious work done in installing the thread, the weight, the horizontal state indicator, etc., and in varying their positions. Even though the horizontal state indicator may be seen at each position in narrow perspective, in the event that the subject is massive, the subject cannot be seen in broad perspective, thereby causing a lot of difficulty during the horizontal and vertical setting work.

For making horizontal relations being recognizable even in the broad perspective, a laser displaying unit is currently being introduced in some sections. The laser displaying unit does not display a laser beam line but generally displays a laser spot. As for the laser beam displaying unit which displays the laser beam line, a producing and controlling process thereof is complex so much that it is expensive, complex and difficult to be used by a user, thereby suffering deterioration in productivity.

Nevertheless, many attempts have been made to apply technology employing the laser displaying unit. For instance, there is "Korean Patent Publication No. 60663".

The "Korean Patent Publication No. 60663" discloses a technology comprising the steps of converting the laser beam emitted from the existing laser beam injector by means of a cylindrical lens or a rotational polygon mirror and maintaining the laser beam line at a level with the reference horizontal line through a calibration process, so as to easily measure the horizontal state and/or the vertical state with the naked eye. However, the aforementioned technology disadvantageously requires a manual handling when adjusting the heights of the horizontal supports to form the mold, thereby having the conventional problems still remaining unsolved in setting the horizontal state of the bottom plane.

Disclosure of Invention

It is, therefore, an object of the present invention to provide an apparatus and method for setting a horizontal state of a bottom plane, which helps to achieve a stable construction of concrete buildings and roads by sensing a laser beam emitted from an existing laser beam injector and automatically setting the horizontal state of the level bottom plane based on the sensed result. To achieve the above object, there is provided an apparatus for setting a horizontal state of a bottom plane, comprising lower plates being fixed on a slab mold and each having a guide screw upwardly fixed on a center surface thereof; an upper plate being disposed on an upper part of the guide screw and forming a reference height to which a cement mortar is filled; and a height setting unit for setting the reference height for the upper plate to be positioned on the guide screw at the reference height up to which the cement mortar is filled.

In another aspect of the apparatus for setting the horizontal state of the bottom plane according to the present invention, the height setting unit includes a laser generating unit being positioned roughly at a central part of the slab mold for emitting a laser beam in all directions by being rotated; a nut being coupled on the guide screw of the lower plate to be upwardly and downwardly slidable and having the upper plate mounted on an upper surface thereof; a guide shaft being positioned in an upright direction of the guide screw, having a guide hole on an inner peripheral surface thereof, a light receiving part on an outer peripheral surface thereof, and a chuck on a lower part thereof with the nut and the chuck being coupled with each other; a control part being installed on an outer peripheral surface of other side of the guide shaft adjacent to the light receiving part; a motor being installed on an outer peripheral surface of a lower part of the guide shaft for rotating the chuck coupled with the nut; and a battery being connected to the control part and the motor, respectively, for supplying an electric power to them. In further another aspect of the apparatus for setting the horizontal state of the bottom plane according to the present invention, the control part includes the light receiving part for receiving the laser beam emitted from the laser generating unit, sensing how far the laser beam deviates from a set position, and outputting the sensed data; a mi-com for receiving a selection signal of an operation mode indicating whether an automatic operation is performed or a manual operation is performed from a user, receiving the light reception sensing signal generated form the light receiving part, and accordingly generating a control signal; and a motor driving part for operating the motor in a normal rotation or in a reverse rotation according to the control signal generated from the mi-com.

In still another aspect of the apparatus for setting the horizontal state of the bottom plane according to the present invention, the motor driving part includes a first LED for receiving a first control signal output from the mi-com through a first resistance, emitting light, and transferring an indication that the motor is normally rotated to the user; a second LED for receiving a second control signal output from the mi-com through a fifth resistance, emitting light, and transferring an indication that the motor is reversely rotated to the user; a first photocoupler for receiving a current passing through the first LED and performing what is called an on-operation; a second photocoupler for receiving a current passing through the second LED and performing the on-operation; a first variable resistance and a second resistance for partially pressing a predetermined positive voltage applied to the first photocoupler at a point of the on-operation of the first photocoupler to such an extent of a transistor driving voltage; a second variable resistance and a sixth resistance for partially pressing the predetermined positive voltage applied to the second photocoupler at a point of the on-operation of the second photocoupler to such an extent of the transistor driving voltage; a first voltage supplier for receiving the voltage partially pressed by the first variable resistance and the second resistance through a third resistance, performing the on- operation, amplifying the predetermined positive voltage and supplying the amplified positive voltage to the motor; a first voltage forwarding part for receiving the voltage partially pressed by the first variable resistance and the second resistance through a fourth resistance, performing the on-operation, and forwarding the voltage, which is supplied from the first voltage supplying part and passes through the motor, to a ground; a second voltage supplying part for receiving the voltage partially pressed by the second variable resistance and the sixth resistance through an eighth resistance, performing the on-operation, amplifying the predetermined positive voltage, and supplying the amplified positive voltage to the motor; and a second voltage forwarding part for receiving the voltage partially pressed by the second variable resistance and the sixth resistance through a seventh resistance, performing the on-operation, and forwarding the voltage, which is supplied from the second voltage supplying part and passes through the motor, to the ground.

In yet another aspect of the apparatus for setting the horizontal state of the bottom plane according to the present invention, the first and second variable resistances are adapted to control a rotational speed of the motor by controlling size of the variable resistances.

In still yet another aspect of the apparatus for setting the horizontal state of the bottom plane according to the present invention, a counter electromotive force absorbing resistance being connected to a voltage output terminal of the first voltage supplying part and a voltage output terminal of the second voltage supplying part is further included to absorb a voltage generated due to the counter electromotive force of the motor.

In another aspect of the apparatus for setting the horizontal state of the bottom plane according to the present invention, a level block is arranged on an outer peripheral surface of a central part of the guide shaft and has a plurality of horizontal state indicators for ensuring a horizontal state of the guide shaft.

A method for setting the horizontal state of the bottom plane according to the present invention comprises of the steps: fixing the lower plates, each having the guide screw upwardly extended therefrom, at a predetermined interval on the slab mold; coupling the nut to be upwardly and downwardly slidable on the guide screw of the lower plate; transferring the nut coupled on the guide screw of the lower plate to be positioned at the reference height by means of the height setting unit; fixing the upper plate on the upper surface of the nut positioned at the reference height; and filling the cement mortar up to a bottom surface of the upper plate.

Brief Description of the Drawings

Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a cross view illustrating a horizontal state indicator inside which a liquid is sealed in the conventional art;

FIG. 2 is a view for explaining a process for setting a reference height at a vertical state by means of a thread and a weight in the conventional art; FIG. 3 is a cross view of an apparatus for setting a horizontal state of a bottom plane according to the present invention;

FIG. 4 and FIG. 5 are a cross view and a front view illustrating a state where the apparatus for setting the horizontal state of the bottom plane according to the present invention is used;

FIG. 6 is a cross view illustrating another embodiment of an apparatus for setting a horizontal state of a bottom plane according to the present invention; FIG. 7 is a cross view illustrating a state where the present invention is used; and

FIG. 8 is an exemplary view illustrating a circuitry of the apparatus for setting the horizontal state of the bottom plane according to the present invention.

Best Mode for Carrying Out the Invention

The present invention will now be described in connection with preferred embodiments with reference to the accompanying drawings.

FIG. 3 is a cross view of an apparatus for setting a horizontal state of a bottom plane according to the present invention. FIG. 4 and FIG. 5 are a cross view and a front view illustrating a state where the apparatus for setting the horizontal state of the bottom plane according to the present invention is used. FIG. 6 is a cross view illustrating another embodiment of an apparatus for setting a horizontal state of a bottom plane according to the present invention. FIG. 7 is a cross view illustrating a state where the present invention is used.

Referring to the figures, the apparatus for setting the horizontal state of the bottom plane according to the present invention roughly comprises lower plates 10, an upper plate 20 and a height setting unit.

The lower plates 10 for example, are plural in number and fixed to a slab mold (not shown) of a concrete structure with a predetermined interval and each has a guide screw 30 on a central surface thereof.

The upper plate 20 is installed on the guide screw 30 of the lower plate 10 and forms a reference height to which a cement mortar is filled.

That is to say, the cement mortar is filled up to a lower surface of the upper plate to form the bottom plane.

The height setting unit serves to control the upper plate 20 to be exactly positioned at the reference height on the guide screw 30, and in detail includes a laser generating unit 40, a nut N, a guide shaft 50, a control part 60, a motor M and a battery B.

The laser generating part 40 is arranged to be adjacent to the lower plate 10 and injects a laser beam of a predetermined wavelength in all directions by being rotated.

The nut N is coupled on the guide screw 30 of the lower plate 10 to be upwardly and downwardly transferable and whose upper surface forms the reference height of the bottom plane in practice.

That is to say, the upper plate 20 is mounted on the upper surface of the nut N and fixed there.

The guide shaft 50 is disposed on an upper part of the lower plate 10, has a through hole (not shown) formed on an inner surface thereof; a light receiving part 51 formed on an outer peripheral surface of the upper part thereof, and including a photo diode (not shown) to receive the beam injected from the laser generating part 40; and a chuck 52 formed on a lower part thereof, rolling-supported by a bearing (not drawn) to be revolutionarily rotated, and having a chucking groove for connecting the chuck to the nut coupled on the guide screw 30.

The control part 60 is installed to be adjacent to the light receiving part 61, and controls a display part for displaying the beam injected from the laser generating part 40 and received through the light receiving part 61 and an on-off of an electric power through the battery B, and the motor M, which will be explained.

The motor M is installed on an outer peripheral surface of a lower part of the guide shaft 50 and rotates the chuck 52 coupled with the nut N.

The battery B applies a power to the motor M and the control part 60.

Meantime, the guide shaft 50 should have the same axle with the guide screw 30 when the chuck 52 disposed on the lower part of the guide shaft 50 is coupled with the nut N, so as to achieve a stable coupling between the chuck 52 and the nut N. In other words, the guide shaft 50 should be maintained in a vertical state.

For the purpose of confirming whether the guide shaft 50 maintains the vertical state with the naked eye, a horizontal state indicator 70 is arranged roughly on an outer peripheral surface of the center of the guide shaft 50, so as to confirm the balance state in all directions, namely, the vertical state of the guide shaft 50.

Operation of the apparatus for setting the horizontal state of the bottom plane according to the present invention will be explained herein below.

Initially, the nut N is coupled to the guide screw 30 of one lower plate 10 among the plurality of lower plates 10 formed on the slab mold.

In this state, a height of the nut N is set by the height setting unit.

To be specific, the guide shaft 50 is positioned in an upright direction of the guide screw 30 and the chuck 52 arranged on the lower part of the guide shaft 50 is coupled with the nut N. Then, when the motor to which the electric power is applied from the battery B is driven in a normal direction or a reverse direction, the nut N together with the chuck 52 is rotated along the guide screw 30 and moved upwardly and downwardly.

The guide shaft 50 is slidably transferred upwardly and downwardly by virtue of the upward and downward motion of the chuck 52 and the nut N as the chuck 52 and the nut N are rotated.

Meantime, the laser beam of the predetermined wavelength is injected in all directions by the laser generating unit 40 and the laser beam injected by the laser generating unit 40 is injected in a horizontal direction at a desired height.

Thus, in the state that the guide shaft 50 is transferred in the upper and lower directions to some extent, the light receiving part 61 of the control part 60 positioned on the outer peripheral surface of the upper part of the guide shaft 50 receives the laser beam and senses the same, and simultaneously the control part 60 stops the operation of the motor M.

Since the operation is conducted in each lower plate 10, although the bottom plane of the slab mold is not level, the uniform height is achieved in the final position of the nut N as a whole.

Thereafter, the chuck 52 is separated from the nut N, the upper plate 20 is positioned on the upper part of the nut N maintaining the uniform height, and the cement mortar is filed up to the lower surface of the upper plate 20, resulting in completion of the level bottom plane. In the apparatus for setting the horizontal state of the bottom plane operated as stated above, an electronic circuitry of the control part 60 will be described with reference to FIG. 8. Referring to FIG. 8, the circuitry of the apparatus for setting the horizontal state of the bottom plane according to the present invention is roughly comprised of a mi-com 61 for receiving a selection signal of an operation mode indicating whether the operation is automatically performed or the operation is manually operated from a user, receiving the light reception sensing signal generated in the light receiving part 51 (not shown in FIG. 8), and accordingly generating a control signal; and a motor driving part for operating the motor indicated at the reference numeral M in the normal rotation or in the reverse rotation according to the control signal generated in the mi-com.

The motor driving part is divided into an area for normally rotating the motor and another area for reversely rotating the motor according to the control signal of the mi-com 61. First, the area for normally rotating the motor includes a first LED LI for receiving a first control signal output from the mi-com 61 through a first resistance Rl, emitting light, transferring an indication that the motor M is normally rotated to the user; a first photocoupler PCI for receiving a current passing through the first LED LI and performing what is called an on-operation; a first variable resistance VRl and a second resistance R2 for partially pressing a predetermined positive voltage V+ applied at a time of the on-operation of the first photocoupler PCI to such an extent of a transistor driving voltage; a first voltage supplying part PU1 for receiving the voltage partially pressed by the first variable resistance VRl and the second resistance R2 through a third resistance R3, performing the on-operation, amplifying the predetermined positive voltage V+ and supplying the amplified positive voltage to the motor M; and a first forwarding part PD1 for receiving the voltage partially pressed by the first variable resistance VRl and the second resistance Re through a fourth resistance R4, performing the on- operation, and forwarding the voltage passing through the motor M to a ground.

Further, the area for reversely rotating the motor M is roughly comprised of a second LED L2 for receiving a second control signal output from the mi-com 61 through a fifth resistance R5, emitting light, and transferring an indication that the motor M is reversely rotated to the user; a second photocoupler PC2 for receiving a current passing through the second LED L2 and performing the on-operation; a second variable resistance VR2 and the sixth resistance R6 for partially pressing the predetermined positive voltage V+ applied to the second photocoupler PC2 at a point of the on-operation of the second photocoupler PC2 to such an extent of the transistor driving voltage; a second voltage supplying part PU2 for receiving the voltage partially pressed by the second variable resistance VR2 and the sixth resistance R6 through an eighth resistance R8, performing the on-operation, amplifying the predetermined positive voltage V+, and supplying the amplified positive voltage to the motor M; and a second forwarding part PD2 for receiving the voltage partially pressed by the second variable resistance VR2 and the sixth resistance R6 through a seventh resistance R7, performing the on-operation, and forwarding the voltage passing through the motor M to the ground. Here, the first voltage supplying part PU1 includes a first transistor TRl for receiving the voltage inputted through the third resistance R3 at a base terminal thereof and performing the on-operation, and a second transistor TR2 being connected to a collector terminal of the first transistor TRl at a collector terminal thereof for receiving the voltage caught in an emitter terminal of the first transistor TRl at a base terminal thereof to amplify the voltage to a huge driving voltage.

Also, the second voltage supplying part PU2 includes a fifth transistor TR5 for receiving the voltage inputted through the eighth resistance R8 at a base terminal thereof and performing the on-operation, and a sixth transistor TR6 being connected to a collector terminal of the fifth transistor TR5 at a collector terminal thereof for receiving the voltage caught in an emitter terminal of the fifth transistor TR5 at a base terminal thereof to amplify the voltage to the huge driving voltage.

The reason why the first and second voltage supplying parts PU1 and PU2 perform the amplification twice, respectively, is that fastening and loosening of the nut N through the rotation of the screw can not be achieved if the voltage applied to the motor M is not huge.

Similarly, the reason why the first and second voltage forwarding parts PD1 and PD2 have two transistors, respectively, is that the current passing through the motor M can be smoothly flowed.

The variable resistances VR 1 and VR 2 are adapted to control the rotational speed of the motor by strong size of the variable resistances.

Finally, an unexplained reference numeral TNR represents a construction for absorbing the voltage generated due to the counter electromotive force of the motor M.

Besides, circuits indicated at reference numerals Ra, Rb, D and C are reset circuits. As shown in the circuit composing of the reference numerals Ra and C at a point of supplying the electric power, the voltage caught in a "CLS" terminal of the mi-com 61 is slowly increased while an electric charge is filled in a condenser C by an RC time constant. The mi-com is reset before the voltage filled in the condenser C becomes Vdd during the above course.

That is to say, the mi-com 61 is not reset when the voltage caught in the "CLS" terminal is at a ground voltage condition or a predeteπnined positive voltage Vdd but is reset when the voltage is a certain voltage within a range from zero to Vdd.

Hence, if a driving power is supplied, the system is reset before the normal operation, thereby serving to accomplish an exact operation.

Futhermore, the reference numeral D in the reset circuit is a discharge path forming diode for discharging the voltage filled in the condenser C in a rapid way, and the reference numeral Rb is a current limiting resistance for preventing the current from being flowed into the "CLS" terminal from the condenser C when a break down phenomenon is generated within the mi-com 61.

Overall operation has been already explained with reference to FIG. 3 through FIG. 7, and thus only a normal operation of the control part 60 will be explained herein below with reference to the circuitry according to the present invention. After all installation is completed as shown in FIG. 4, if an automatic mode is selected in the apparatus for setting the horizontal state of the bottom plane, the mi-com 61 generates the sensing signal according to the received position of the laser beam sensed through the light receiving part 51.

At this time, if the mi-com 61 judges the normal rotation is needed, it outputs the first control signal and controls the first LED LI to emit light. The second control signal should maintain a high impedance condition.

Accordingly, the first photocoupler PCI performs the on-operation, and the predetermined positive voltage V+ applied to the first photocoupler PCI is forwarded to the ground through the first variable resistance VRl and the second resistance R2, whereby the voltage connected to the first variable resistance VRl and partially pressed is transferred to a rear end through the third resistance R3 and the fourth resistance R4.

As the partially pressed voltage inputted through the third resistance R3 is inputted to the base terminal of the first transistor TRl comprised in the first voltage supplying part PUl, the first transistor TRl performed the on-operation and the second transistor TR2 connected to the emitter terminal of the first transistor at the base terminal thereof is accordingly turned on.

Therefore, the predetermined positive voltage V+ is amplified to the huge driving voltage through the second transistor TR2 and supplied to the motor M. Moreover, as the partially pressed voltage inputted through the fourth resistance R4 is inputted to the base terminal of the third transistor TR3 comprised in the first voltage forwarding part PD1, the third transistor TR3 performs the on- operation, and the fourth transistor TR4 being connected to the emitter terminal of the third transistor TR3 at the base terminal thereof is accordingly turned on, whereby the voltage passing through the motor M is forwarded to the ground.

At that time, since the second control signal is not output from the mi-com

61 and hence the second voltage supplying part PU2 and the second voltage forwarding part PD2 can not perform the on-operations, the voltage is actually applied to the motor M. As a result, the normal rotation is performed in view that only one forwarding path of the pertinent voltage is formed.

During the course of performing the normal rotation, in case that a critical position set according to the rotation of the motor is exceeded in an opposite direction, the mi-com 61 judges that the reverse rotation is needed, and thereafter converts the first control signal into the high impedance condition and outputs the second control signal.

Consequently, the mi-com 61 outputs the second control signal and controls the second LED L2 to emit light, and the predetermined positive voltage V+ applied to the second photocoupler PC2 at the point of the on-operation of the second photocoupler PC2 is forwarded to the ground through the second variable resistance VR2 and the sixth resistance R6, whereby the voltage connected to the second variable resistance VR 2 and partially pressed is transferred to the rear end through the seventh resistance R7 and the eighth resistance R8.

As the partially pressed voltage inputted through the eighth resistance R8 is inputted to the base terminal of the fifth transistor TR5 comprised in the second voltage supplying part PU2, the fifth transistor TR5 performs the on-operation, and the sixth transistor Tr6 connected to the emitter terminal of the fifth transistor Tr5 at the base terminal thereof is accordingly turned on.

In consequence, the predetermined positive voltage V+ is amplified to the huge driving voltage through the sixth transistor TR6 and then supplied to the motor M.

Next, as the partially pressed voltage inputted through the seventh resistance R7 is inputted to the base terminal of the seventh transistor TR7 comprised in the second voltage forwarding part PD2, the seventh transistor Tr7 performs the on-operation, and the eighth transistor TR8 connected to the emitter terminal of the seventh transistor TR7 at the base terminal thereof is accordingly turned on, whereby the voltage passing through the motor M is forwarded to the ground.

Thereupon, since the mi-com 61 does not output the first control signal and thus the first voltage supplying part PUl and the first voltage forwarding part PD1 can not perform the on-operations, the voltage is actually applied to the motor M. In view that only one forwarding path of the pertinent voltage is formed, the current is flowed in opposite direction to that of the current flowed during the normal rotation and the reverse rotation is performed. Reiteratively undergoing the process, the system is converged on the set position.

In the meanwhile, in case of the manual operation, the same operation may be carried out in a manner that the user manipulates switches (not drawn) arranged on portions indicated at A and B in FIG. 8 and applies the voltage in a discretionary way.

Therefore, roads requiring a level plane can be constructed with ease as well as the mold for the concrete structure can be installed with ease.

Meanwhile, the above embodiments exemplifies construction of a multistory structure but are not limited to it. It will be known by those skilled in the art that the embodiments according to the present inventions are applicable to various constructions of roads and buildings requiring the level plane.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Industrial Applicability

As stated above, an apparatus for setting a horizontal state of a bottom plane according to the present invention is capable of achieving a level bottom plane at a point of filling cement mortar, since a nut disposed on a guide screw is settable at an uniform height by means of a height setting unit. Hence, the present invention has an advantage of ensuring a stable construction of multi-story buildings, roads, or the likes.

Claims

Claims:

1. An apparatus for setting a horizontal state of a bottom plane, comprising: lower plates being fixed on a slab mold and each having a guide screw upwardly fixed on a center surface thereof; an upper plate being disposed on an upper part of the guide screw and forming a reference height to which cement mortar is filled; and a height setting unit for setting a reference height for the upper plate to be positioned on the guide screw at the reference height to which the cement mortar is filled.

2. The apparatus of claim 1, wherein the height setting unit includes: a laser generating unit being positioned roughly at a central part of the slab mold for emitting a laser beam in all directions by being rotated; a nut being coupled on the guide screw of the lower plate to be upwardly and downwardly slidable and having the upper plate mounted on an upper surface thereof; a guide shaft being positioned in an upright direction of the guide screw, having a guide hole through an inner peripheral surface thereof, a light receiving part on an outer peripheral surface of an upper part thereof and a chuck on a lower part thereof with the chuck being coupled with the nut; a control part being installed on an outer peripheral surface of other side of the guide shaft adjacent to the light receiving part; a motor being installed on an outer peripheral surface of a lower part of the guide shaft and rotating the chuck coupled with the nut; and a battery being connected to the control part and the motor, respectively, and supplying electric power to them.

3. The apparatus of claim 2, wherein the control part includes: the light receiving part for receiving the laser beam emitted from the laser generating unit, sensing how far the laser beam deviates from a set position, and outputting the sensed data; a mi-com for receiving a selection signal of an operation mode indicating whether an automatic operation is performed or a manual operation is performed from a user, receiving the light reception sensing signal generated form the light receiving part, and accordingly generating a control signal; and a motor driving part for operating the motor in a normal rotation or in a reverse rotation according to the control signal generated from the mi-com.

4. The apparatus of claim 3, wherein the motor driving part includes: a first LED for receiving a first control signal output from the mi-com through a first resistance, emitting light, and transferring an indication that the motor is normally rotated to the user; a second LED for receiving a second control signal output from the mi-com through a fifth resistance, emitting light, and transferring an indication that the motor is reversely rotated to the user; a first photocoupler for receiving a current passing through the first LED and performing what is called an on-operation; a second photocoupler for receiving a current passing through the second LED and performing the on-operation; a first variable resistance and a second resistance for partially pressing a predetermined positive voltage applied to the first photocoupler at a point of on- operation of the first photocoupler to such an extent of a transistor driving voltage; a second variable resistance and a sixth resistance for partially pressing the predetermined positive voltage applied to the second photocoupler at a point of on-operation of the second photocoupler to such an extent of the transistor driving voltage; a first voltage supplier for receiving the voltage partially pressed by the first variable resistance and the second resistance through a third resistance, performing the on-operation, amplifying the predetermined positive voltage and supplying the amplified positive voltage to the motor; a first voltage forwarding part for receiving the voltage partially pressed by the first variable resistance and the second resistance through a fourth resistance, performing the on-operation, and forwarding the voltage, which is supplied from the first voltage supplying part and passes through the motor, to a ground; a second voltage supplying part for receiving the voltage partially pressed by the second variable resistance and the sixth resistance through an eighth resistance, performing the on-operation, amplifying the predetermined positive voltage and supplying the amplified positive voltage to the motor; and a second voltage forwarding part for receiving the voltage partially pressed by the second variable resistance and the sixth resistance through a seventh resistance, performing the on-operation, and forwarding the voltage, which is supplied from the second voltage supplying part and passes through the motor, to the ground.

5. The apparatus of claim 4, wherein the first and second variable resistances are adapted to control a rotational speed of the motor by controlling size of the variable resistances.

6. The apparatus of claim 4, wherein the motor driving part further includes a counter electromotive force absorbing resistance being connected to a voltage output terminal of the first voltage supplying part and a voltage output terminal of the second voltage supplying part to absorb a voltage generated due to a counter electromotive force of the motor.

7. The apparatus of claim 2, wherein a level block is arranged on an outer peripheral surface of a central part of the guide shaft and has a plurality of horizontal state indicators for ensuring a horizontal state of the guide shaft.

8. A method for setting a horizontal state of a bottom plane comprising the steps of: fixing lower plates, each having a guide screw upwardly extended therefrom, at a predetermined interval on a slab mold; coupling a nut to be upwardly and downwardly slidable on the guide screw of the lower plate; transferring the nut coupled on the guide screw of the lower plate to be positioned at a reference height by means of a height setting unit; fixing an upper plate on an upper surface of the nut positioned at the reference height; and filling a cement mortar up to a bottom surface of the upper plate.