KR101665503B1

KR101665503B1 - Jack-up mount

Info

Publication number: KR101665503B1
Application number: KR1020150066025A
Authority: KR
Inventors: 윤은중; 이장현; 이재국
Original assignee: (주)엔에스브이
Priority date: 2015-05-12
Filing date: 2015-05-12
Publication date: 2016-10-13

Abstract

A jack-up mount is disclosed. The present invention comprises a housing, a jack bolt, a base plate, a coil spring, a press plate, a presetting bolt, and vibration-proof rubber. The present invention can improve damping performance and reliability through complex vibration insulation of the coil spring and the vibration-proof rubber.

Description

Jack-up mount {JACK-UP MOUNT}

The present invention relates to a jack-up mount, and more particularly to a jack-up mount capable of realizing a low natural frequency by pre-setting a coil spring and improving a vibration isolation effect, .

A floating floor system is a structure in which an air gap is formed between a floor slab or a foundation slab of a building and a floored floor for insulation of vibration, impact and noise, It is often called the raised floor. Floating floor system is able to extend the lifespan of buildings by preventing or blocking vibration, shock and noise transmission to the surroundings, and it can be installed in various machine room and air conditioning room because it can create quiet environment and comfortable environment of machinery .

On the other hand, the floors are constructed so as to be supported by the foundation slabs by a plurality of jack-up mounts. Jack-up mounts have been developed in a variety of shapes and configurations, and are equipped with a jack bolt for lifting the floated floor. Jack bolts are often called jack screws or lifting bolts. Construction of floating floor system by such jack-up mount is prescribed in Seoul Special Building Machinery Equipment Specification (M08040 Dustproofing and Soundproofing). According to this specification, the floors are constructed of reinforced concrete slabs of at least 100 mm thickness and the air layer should be constructed of 50 mm height and 150 mm height from the floor slabs.

As an example of a jack-up mount for a floating floor system, Korean Patent No. 10-0538817 entitled " Floor vibration high floor of a building "has a mount, a cover and a screw. The mount consists of an anti-vibration rubber placed on the foundation slab. The lower surface of the vibration proof rubber and the lower surface of the outer surface are surrounded by the lower flat plate and the support ring. The upper portion of the anti-vibration rubber projects in a trapezoidal shape on the upper portion of the support ring. The cover is installed on the reinforced concrete slab. The screw is fastened to the female screw of the cover and fixed to the center of the top of the vibration proof rubber.

The vibration, shock, and noise transmitted from mechanical devices installed on floors are damped by the buffering action of the anti-vibration rubber. However, since the vibration proof rubber has a creep phenomenon in which the physical property changes with time, the mechanical characteristics are severely changed due to environmental factors such as temperature and moisture, so mechanical characteristics must be considered when the construction is carried out. In addition, the fatigue life of the anti-vibration rubber is reduced when the vibration fatigue load is applied, and the fatigue life is greatly reduced when the resonance region where the resonance frequency and the natural frequency overlap exists.

Another example of a jack-up mount for a floating floor system is disclosed in Korean Patent Laid-Open Publication No. 10-2012-0127902 entitled " Spring jack-up mount and floating floor structure using the same ", which comprises a hollow housing, a lower support plate, . The housing is mounted on a floating floor, and a female thread is formed on the inner surface. The lower support plate is disposed on the foundation slab and aligned with the housing at the bottom of the housing. The upper support plate is composed of a male screw fastened to a female screw. The coil spring is mounted between the lower support plate and the upper support plate.

Vibration, shock and noise transmitted from a mechanical device installed on a floated floor are attenuated by the buffering action of the coil spring. The coil spring has excellent vibration damping performance due to low natural frequency and has excellent environmental performance such as temperature and moisture. However, it has problems such as transient vibration, surging, rocking, . Particularly, when the coil spring is subjected to a fluctuating load close to the natural frequency, there is a disadvantage that the vibration proof performance is low due to surging which generates natural vibration in the high vibration region.

2. Description of the Related Art [0002] In a float floor system constructed using a conventional jack-up mount, various types of machines such as a blower, a pump, etc. constituting a machine installed on a floated floor, for example, a heating and ventilation system In order to increase the vibration insulation effect according to the low vibration and low noise of the rotating device, a jack-up mount capable of lowering the natural frequency of the floated floor system is required in the market. In case of base excitation, the lower the stiffness of the spring, the larger the insulation effect. However, if the spring force is too low, the load can not be properly supported. Therefore, It is difficult to lower the natural frequency of the motor.

On the other hand, the natural frequency of the floating floor system can be reduced by increasing the free length (Height or Free length) while maintaining the stiffness of the spring to support the housing. In order to increase the free length of the spring in the jack-up mount, the height of the housing in which the spring is received must be increased. However, since the height of the housing is about 100 mm, which is equal to the thickness of the floored bottom, there is a fundamental limitation in increasing the free length of the spring. If the thickness of the floored floor is increased to increase the height of the free space of the spring, that is, the height of the housing, the rigidity of the floored floor increases, but the workability and safety due to weight increase is lowered It is very difficult to do.

The present invention is intended to solve various problems of the conventional jack-up mount as described above. It is an object of the present invention to provide a new jack-up mount capable of realizing a low natural frequency and improving the vibration insulation effect by pre-setting the coil spring.

Another object of the present invention is to provide a jack-up mount capable of improving dustproof performance and reliability by a composite vibration insulation that compensates for the strength and weakness of the coil spring and the vibration-proof rubber.

It is a further object of the present invention to provide a structure that is housed in a bellows with a coil spring and a vibration-proof rubber to ensure performance and life from environmental factors, and also prevents the coil spring from swinging and rocking A jack-up mount capable of improving dustproof performance.

According to an aspect of the invention, a jack-up mount is provided. A jack-up mount according to the present invention is a jack-up mount for supporting a floated floor with respect to a floor slab so as to form an air layer between the floor slab and a floored floor, A housing having a female thread formed to pass through the center of the upper surface and communicate with the accommodation space; A jack bolt fastened to the female thread of the housing for lifting the floating floor; A base plate accommodated in the accommodation space so as to be placed on the floor slab and having a bore formed at the center; A coil spring mounted on the base plate; A press plate accommodated in the accommodation space for pressing the coil spring and having a female screw formed at the center thereof; The bottom portion of the base plate is received so that the bottom portion thereof is restricted from moving upward and can be rotated and moved downward and passes through the base plate to move the press plate toward the base plate for presetting the coil spring A pre-setting bolt having an upper portion fastened to a female screw of a press plate; And a bore formed in the receiving space and adapted to receive a base plate, a coil spring, a press plate and a presetting bolt, wherein the press plate is fixed to the upper side, the lower end of the jack bolt is passed, And a bellows having a hole formed at the center of the upper surface thereof and having a plurality of corrugations formed on the outer surface thereof.

In addition, the bore of the base plate has a clearance allowing the lower portion of the pre-setting bolt to move downward, and the lower portion of the pre-setting bolt is moved along the bore of the base plate before the coil spring reaches the close- And is moved downward to be supported by the floor slab.

The jack-up mount according to the present invention can realize a low natural frequency of a floor system floated by a pre-setting of a coil spring with a limited free space and improve the vibration insulation effect. In addition, vibration isolation performance and reliability can be improved by the combined vibration isolation of the coil spring and the vibration proof rubber. In addition, the coil spring is accommodated in the bellows with the vibration-proof rubber, thereby ensuring performance maintenance and lifetime from environmental factors, as well as preventing the surge and rocking of the coil spring, thereby improving the dustproof performance.

FIG. 1 is a perspective view showing a jack-up mount according to the present invention. FIG.
FIG. 2 is a perspective view showing a separate structure of a jack-up mount according to the present invention. FIG.
3 is a cross-sectional view showing a configuration of a jack-up mount according to the present invention.
FIG. 4 is a cross-sectional view illustrating a structure in which the housing is lifted by fastening a jack bolt in FIG. 3;
5 is a cross-sectional view illustrating the operation of the coil spring in the jack-up mount according to the present invention.
6 to 9 are cross-sectional views illustrating a process for constructing a floated floor by a jack-up mount according to the present invention.
10 is a cross-sectional view for explaining the operation of the pre-setting bolt in the operation of the excessive load in the jack-up mount according to the present invention.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of a jack-up mount according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIGS. 1 to 4 and 9, a jack-up mount 100 according to the present invention is used in the construction of the floored floor system 10. The floated floor system 10 is lifted from the floor slab 20 by the jack-up mount 100 so that the floor 30 is floated so that an air layer 40 is formed between the floor slab 20 and the floored floor 30 .

The jack-up mount (100) according to the present invention has a housing (110) embedded in a floating floor (30). The housing 110 is formed in a Bell-shaped shape having a receiving space 112 formed so as to be curved downward. The through hole 112a is formed at the center of the upper surface of the housing 110 so as to communicate with the accommodation space 112. A female screw 114 is formed in the lower portion of the inner surface of the through hole 112a.

The housing 110 may be formed of plastic by injection molding or casting metal. When the housing 110 is formed by plastic injection molding, the female screw 114 can be formed by insert molding a nut 116 into the through hole 112a. When the housing 110 is formed by casting, the female screw 114 can be formed by tapping the inner surface of the through hole 112a. A plurality of rebar lugs 118a and 118b or a plurality of hooks are formed on the lower and upper surfaces of the outer surface of the housing 110, respectively. The floors 32a and 32b constituting the floored floor 30, that is, the reinforced concrete slab 32 are supported by the rebar lugs 118a and 118b.

The jack-up mount 100 according to the present invention includes a jack bolt 120 fastened to the female screw 114 of the housing 110 for lifting the floated floor 30. The lower end of the jack bolt 120 is inserted into the receiving space 112 through the female screw 114. And the pushing protrusion 122 is extended to the lower end of the jack bolt 120. A recess 124 capable of engaging a tool such as a wrench or a jack-up driver for fastening the jack bolt 120 is provided at the upper end of the jack bolt 120 As shown in Fig. In some embodiments, the top of the jack bolt 120 may be configured with a hexagonal head capable of engaging the tool.

As shown in FIG. 6, the jack bolt 120 may be detached from the female screw 114 prior to the placement of the concrete for construction of the floored floor system 10. [0064] As shown in FIG. A plug 126 is detachably coupled to the female screw 114 when the jack bolt 120 is detached. The plug 126 may be made of flexible plastic or resin.

1 to 4 and 9, a jack-up mount 100 according to the present invention includes a base plate (not shown) received in a receiving space 112 of a housing 110 so as to be placed on a floor slab 20 And a base plate 130. The base plate 130 is received in the lower portion of the accommodation space 112 in such a manner that the base 110 closes the accommodation space 112 of the housing 110 before the application of the reinforced concrete slab 22. Bosses 132 are formed at the center of the upper surface of the base plate 130. And a bore 134 is formed at the center of the boss 132. The bore 134 is communicated with the through hole 136 formed in the center of the upper surface of the boss 132. The diameter of the through hole 136 is smaller than the diameter of the bore 134. The base plate 130 is formed of a steel plate.

An anti-vibration rubber pad 140 is attached to the lower surface of the base plate 130 for vibration isolation. The anti-vibration rubber pad 140 may be bonded to the lower surface of the base plate 130 by crosslinking or may be integrally formed with the base plate 130 by outsert molding. In some embodiments, a plurality of ribs may be formed on the bottom surface of the anti-vibration rubber pad 140 to reduce the contact area between the anti-vibration rubber pad 140 and the bottom slab 20.

The jack-up mount 100 according to the present invention includes a coil spring 150 mounted on the base plate 130 and a coil spring 150 mounted on the base plate 130 for substantial vibration insulation between the floor slab 20 and the floor 30, And a press plate 160 disposed above the coil spring 150 so as to be pressed. Each of the coil spring 150 and the press plate 160 is accommodated in the housing space 112 of the housing 110. A subcoil spring 152 is further mounted inside the coil spring 150. The sub coil spring 152 interlocked with the coil spring 150 can be usefully used for high-load vibration insulation.

The press plate 160 may be formed of a steel plate. A through hole 162 through which the pushing protrusion 122 of the jack bolt 120 is fitted is formed at the center of the press plate 160. The female screw 164 is formed so as to communicate with the through hole 162 at the center of the press plate 160. As shown in FIGS. 3 and 4, the female screw 164 is formed by welding a nut 166 to the center of the lower surface of the press plate 160. In some embodiments, the nut 166 may be formed by tapping in the center of the press plate 160.

The jack-up mount 100 according to the present invention includes a pre-setting bolt 170 for moving the press plate 160 toward the base plate 130 in order to preset the coil spring 150. And a head 172 is formed at the lower portion of the free setting bolt 170. [ The diameter of the head 172 is formed to be larger than the diameter of the through hole 136 and can not pass through the through hole 136. The head 172 is received in the bore 174 of the base plate 130. The head 172 contacts the edge of the through hole 136 to restrain the upward movement and rotate in place. The length of the bore 134 is longer than the height of the head 172. The bore 134 thus has a free space for the head 172 to move downward. The upper portion of the pre-setting bolt 170 passes through the through hole 136 and is fastened to the female screw 164 of the press plate 160.

The jack-up mount 100 according to the present invention includes a vibration-damping rubber accommodated in the housing space 112 of the housing 110 to interlock with the press plate 160 for buffering between the floor slab 20 and the floor 30, (180). The anti-vibration rubber 180 is composed of a bellows 182 of a longitudinal shape capable of expanding and contracting in the axial direction. The bellows 182 has a plurality of corrugations 184 formed along the axial direction and a bore 186 formed at the center of the corrugation 184. A through hole 186 is formed in the upper center of the bellows 182 so as to communicate with the bore 188.

Each of the base plate 130, the coil spring 150, the sub coil spring 152 and the press plate 160 is accommodated in the bore 186 of the bellows 182. A through hole 188 is formed in the center of the upper surface of the bellows 182. The pushing protrusion 122 of the jack bolt 120 passes through the through hole 188 of the bellows 182 and is fitted into the through hole 162 of the press plate 160. The edge of the press plate 160 is fitted and fixed in a groove 190 formed on the inner surface of the bore 186. The upper portion of the bellows 182 may be bonded to the press plate 160 by the bridging or integrally formed with the press plate 160 by insert molding. In some embodiments, the anti-vibration rubber 180 includes a longitudinal or inverted cup-shaped container (not shown) capable of receiving a base plate 130, a coil spring 150, a sub coil spring 152 and a press plate 160, reverse cup-shaped vessel).

Hereinafter, the operation of the jack-up mount according to the present invention having such a configuration will be described.

Referring to FIG. 6, an operator installs an insulation board 60 around all the walls 50 and the columns to isolate the floors 30 before the jack-up mount 100 is installed. Extruded polystyrene foam 62, Styrofoam, or the like is used as the heat insulating board 60. The expanded polystyrene foam 62 is often referred to as Iso Pink (trade name) and is widely used for the use of the floated floor system 10.

After the installation of the heat insulating board 60, the operator inserts a vinyl sheet 70 as a release material of concrete on the entirety of the bottom slab 20 and the heat insulating board 60, for example, a poly- ethylene film). At this time, the vinyl sheet 70 sufficiently covers the upper portion of the heat insulating board 60. The joint of the vinyl sheet 70 is joined by an OPP film (Oriented poly propylene film).

Subsequently, after laying the vinyl sheet 70, the operator installs the jack-up mount 100 on the vinyl sheet 70 laid on the bottom slab 20. 6 to 9, one jack-up mount 100 is shown, but the jack-up mount 100 is installed at a plurality of locations based on the construction drawing. At this time, the jack bolt 120 is separated from the female screw 114, and the through hole 112a is blocked by the plug 126. [ Each of the base plate 110, the coil spring 150, the sub coil spring 152, the press plate 160 and the presetting bolt 170 is accommodated in the bore 186 of the bellows 182 .

Referring to FIGS. 3, 4 and 8, the jack-up mount 100 according to the present invention includes a coil spring 152 before installation of the floored floor 30 to realize a low natural frequency of, for example, Preset. When the worker rotates the free setting bolt 170 in the clockwise direction and engages the female screw 164 of the press plate 160, the press plate 160 is moved toward the base plate 130. The press plate 160, which is moved downward, presses the coil spring 150 to generate a deformation, thereby increasing the elastic limit of the coil spring 150. In this embodiment, the displacement of the coil spring 150 by presetting is about 10 mm. In addition, the maximum displacement of the coil spring 150 in the housing space 112 of the housing 110 is about 10 mm before presetting, but is increased to about 20 mm by presetting.

6 to 8, when the installation of the jack-up mount 100 is completed, the operator installs the floor 30 in which the housing 110 is embedded. The floated floor 30 is constructed of a reinforced concrete slab 32 in which a plurality of rebars 32a and 32b and a plurality of reinforcing bars 32c and 32d are laid and then a concrete 32c is laid and cured. The ribs 32a and 32b are supported by the lever lugs 118a and 118b of the housing 110, respectively. In some embodiments, the reinforcing bars 32c and 32d may be supported by the ribs 32a and 32b and a plurality of spacers. Therefore, when the curing of the concrete 32c is completed, the housing 110 is firmly embedded in the bottom 30 fixed to the ribs 32a and 32b and the concrete 32c. The vinyl sheet 70 prevents the concrete 32c from sticking to the floor slab 20 and the heat insulating board 60. [

7 and 8, the worker separates the plug 126 from the female screw 114 after completion of the installation of the floating floor 30, and uses a tool such as a wrench or a jack- (120) is fastened to the female screw (114). The lower end of the jack bolt 120 which has passed through the female screw 114 is supported by being inserted into the through hole 162 of the press plate 160. The housing 100 is moved upward by fastening the jack bolts 120 and the bottom 30 floated together with the housing 100 is lifted from the bottom slab 20.

9, when the air layer 40 having a height of about 50 mm is formed between the floor slab 20 and the floored floor 30 by lifting the floored floor 30, As shown in Fig. At this time, the upper end of the jack bolt 120 is immersed or slightly protruded above the housing 100. The pressing protrusion 122 of the jack bolt 120 is inserted into the through hole 162 of the press plate 160 and presses the press plate 160. Therefore, the coil spring 150 is maintained in the preset state by the pressing of the press plate 160.

9, when the lifting of the floored floor 30 is completed, the operator finishes the vinyl sheet 70 laid on the heat insulating board 60 and exposes the heat insulating board 60 with a width of about 20 mm, A sealant (80) having a thickness of about 10 mm is caulked. In addition, the operator caulkes the sealant 82 against the female screw 114 to prevent the penetration of foreign matter such as moisture through the female screw 114. [

Upon completion of the installation of the floor system 10 opened by the jack-up mount 100 according to the present invention, mechanical devices such as various rotary devices of the air-conditioning and air-conditioning system are installed on the floored floor 30. Vibration, shock, and noise generated by the operation of the mechanical device are transmitted to the coil spring 150 through the floating floor 30, the housing 110, the jack bolt 120, and the press plate 160. The coil spring 150 performs vibration insulation while being stretched, compressed, or expanded in accordance with the transmitted vibration and impact.

Referring to FIG. 5, the coil spring 150 generally uses about 80 to 90% of the maximum displacement amount without using it in a tightly adhering field (Hs), and it is 50 to 60% Degree. In the jack-up mount 100 according to the present invention, the coil spring 150 holds a preset position P1 where the free length H is, for example, about 60 mm and is compressed to about 50 mm by presetting. The coil spring 150 is further compressed by about 10 mm in the preset position P1 to maintain the equilibrium state P2 when a load due to the floating floor 30 and the mechanical device is applied to the coil spring 150 . Therefore, the displacement of the coil spring 150 is increased about twice as much as before the presetting, and becomes about 20 mm.

The natural frequency? _N of the floated floor system 10 is, as is well known,

. Where k is the spring constant and m is the mass applied to the jack-up mount. When the frequency of the floor slab 20 is?, The frequency region having the vibration insulation effect

And amplification occurs in a frequency range shorter than this. The jack-up mount 100 according to the present invention can be used without increasing the spring constant, i.e., the stiffness of the coil spring 150

The coil spring 150 with the free length H extended is accommodated in the housing 110 by presetting and the amount of displacement? X of the coil spring 150 is increased to about 20 mm in the housing 110, The natural frequency of the floated floor system 10 as a whole can be reduced to 4.5 Hz or less when the frequency of the floor system 20 is, for example, about 7 Hz.

On the other hand, the bellows 182 cooperates with the coil spring 150 to perform vibration insulation. As described above, the jack-up mount 100 according to the present invention is constructed by the composite vibration insulation of the bellows 182 with the coil spring 150 having excellent vibration-proof performance in the low-frequency region and the vibration- Vibration, shock, and noise. In addition, since the coil spring 150 is accommodated in the bellows 182, excessive vibration, surging, and oscillation of the coil spring 150 are prevented, thereby enhancing the insulation effect.

Referring to FIG. 10, when the excessive load or the impact load acts on the instantly floating floor 30, the coil spring 150 reaches the close contact area or is deformed shorter than the close contact area so that the function of the jack- Can be lost. At this time, since the jack-up mount 100 functions as a point of the floated floor 30, the floored floor 30 may be broken. The head 172 of the presetting bolt 170 which has moved down the bore 134 is supported by the bottom slab 20 before the coil spring 150 reaches the close contact area due to an excessive load or an impact load, And serves as a stopper for preventing the spring 150 from coming into close contact. When the pre-setting bolt 170 is supported on the bottom slab 20, the pre-setting bolt 170 functions as a load support for supporting the load together with the jack bolt 120 and the press plate 160 Thereby preventing breakage of the floated floor 30. Therefore, safety and reliability of the floated floor system 10 against an excessive load or an impact load can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, 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.

10: Floating floor system 20: Floor slab
30: Floating floor 40: Air layer
50: wall 60: insulating board
100: Jack-up mount 110: Housing
112: accommodation space 114: female thread
120: Jack bolt 122: Pushing projection
130: base plate 134: bore
140: anti-vibration rubber pad 150: coil spring
152: sub coil spring 160: press plate
164: female thread 170: presetting bolt
180: Dustproof rubber 182: Crease

Claims

A jack-up mount for supporting a floated floor with respect to the floor slab so that an air layer is formed between the floor slab and the floored floor,
A housing in which a receiving space is formed to be inserted into the floating floor and the lower wall is formed, and a female screw is formed to pass through the center of the upper surface;
A jack bolt fastened to the female screw of the housing for lifting the floating floor;
A base plate accommodated in the accommodation space so as to be placed on the floor slab and having a bore formed at a center thereof;
A coil spring mounted on the base plate;
A press plate accommodated in the accommodating space for pressing the coil spring and having a female screw formed at the center thereof;
Wherein the bore of the base plate is received in such a manner that the bottom portion thereof is restricted in its upward movement and can be rotated and moved downward, and the press plate is moved to the base plate in order to preset the coil spring. A pre-setting bolt passing through the base plate and having an upper portion fastened to a female screw of the press plate;
And a bore accommodated in the accommodation space and configured to receive the base plate, the coil spring, the press plate, and the presetting bolt, wherein the platen plate is fixed to the upper side, And a bellows having a hole formed at the center of the upper surface thereof to allow the press plate to pass therethrough and having a plurality of wrinkles formed on the outer surface thereof.

delete

The method according to claim 1,
Wherein a groove is formed on the inner surface of the bore of the bobbin to fix the edge of the pre-vibration-damping rubber plate.

delete

The method according to claim 1 or 3,
The bore of the base plate has a clearance space in which the lower portion of the presetting bolt can be moved downward and the lower portion of the presetting bolt is fixed to the base plate before the coil spring reaches the close- And is configured to be moved downward along the bore to be supported by the bottom slab.

The method according to claim 1 or 3,
A sub coil spring mounted on the inner side of the coil spring, and a vibration proof rubber pad attached to a lower surface of the base plate.