KR100418456B1 - Floor structure - Google Patents

Abstract

It provides a floor structure that can enhance the sound insulation performance while maintaining a frame structure made of a metal frame member or beam member.

The granular body 13, such as a reducing pellet, is enclosed in the space part 11 of the metal beam member 3, Comprising: It consists of frame | skeleton which consists of a frame member and the beam member 3, and is comprised.

Description

Floor structure {FLOOR STRUCTURE}

TECHNICAL FIELD The present invention relates to a floor structure having a frame structure of a metal frame member and a beam member made of a metal member crossing inside the frame member, and more particularly, to an excellent soundproofing performance.

In recent years, in the construction of a house by the conventional construction method, instead of a floor structure in which floor boards are joined to a frame of wood, a floor structure in which a floor board is joined by a frame made of a metal member and a frame made of a beam member is adopted. Since a frame made of a metal member frame and a beam member are used, the seismic resistance and durability are excellent.

In particular, when a thin member having a plate thickness of 1 to 3 mm is used as the frame member and the beam member, tapping or fixing of the field construction is possible, and construction can be performed in the same manner as in the conventional method.

When such a flooring structure having a frame made of a metal member and a frame is used as the boundary floor at the boundary of the upper and lower floors of the multi-family house, it is light and simple, and the weight and rigidity are small. It is necessary. In particular, when the tire is dropped directly on the boundary floor by simulating skipping or walking, the magnitude of the impact sound (hereinafter referred to as the heavy floor impact sound) or floor vibration generated under the floor is measured, and is generated by walking on the floor. It is necessary to take countermeasures against impacts.

As a method for reducing the heavy floor impact sound, there are (1) a method of increasing the weight of the floor structure and (2) a method of increasing the bending rigidity of the floor structure. There is also a method of increasing the impedance corresponding to the multiplication of (1) (2). Further, as a method of quickly attenuating the floor vibration after the impact force action and suppressing the discomfort, there is also a method of imparting vibration damping property to the floor. By providing this damping property, the suppression of the high frequency sound, ie, the metal sound, which occurs especially in the structure using a lot of metal is also realized.

As a method of increasing the weight of the floor structure of (1), there is a method in which a plurality of floorboards having a heavy weight such as a cement board or the like are placed on a frame made of a frame member made of a metal member and a beam member in a stacked form. However, when a heavy floorboard is placed, it is contrary to the original intention to form a floor structure lightly and simply using a metal framed frame.

As a method of increasing the rigidity of the floor structure of (2), there is a method of increasing the bending rigidity of constituent members such as a metal frame member and a beam member. Specifically, it is achieved by increasing the cross-sectional secondary moment by increasing the cross-sectional dimension, number, and plate thickness of the floorboard, or by constructing these members from a material having a high elastic modulus. However, a large cross section or increase in the number of frame members, beam members, and floorboards results in an increase in weight and occupancy volume, and the increase in the number of parts increases the material and construction cost. Moreover, as a method of (3), there is a method of adhering the vibration damping material to the floorboard or the beam member, and the unpleasant feeling becomes large, and a large effect cannot be obtained at a low frequency (for example, 100 Hz or less). In order to realize the above (1) and (3), as described in Japanese Patent Application Laid-open No. Hei 10-205043, instead of a heavy floorboard, a plurality of hollows inside the molded cement panel are filled with sand-like particles. In order to realize the sound insulation floor and the above (3), as disclosed in Japanese Patent Laid-Open No. 11-217891, a plurality of cell spaces (honeycomb cores) are formed between two opposing sheets, and within this cell space. It is also conceivable to use a vibration damping panel encapsulated with an elastic granular material for floorboards. However, since a thick floorboard with a complicated structure is used, it causes an increase in occupancy volume and an increase in construction cost. There is this.

Therefore, as a method of reducing heavy floor impact sound while maintaining a frame made of metal shape, in particular, the weights are concentrated in a place with high vibration, and at the same time, for example, at a low frequency of 100 Hz or less, A method of arranging a dynamic damper (or a dynamic damper: a vibration system composed of a weight and a panel) that can be given is considered. When the floor structure is made of metal frame, the weight is about 20 ~ 30kg / m2. When the floor is vibrated by walking force or the like and the floor vibrates, the floor is inserted into the outer wall. Since it vibrates, the inertial mass of a wall is added to the inertial mass of a floor, and the equivalent mass in the position where a floor vibrates most may be 100-300 kg.

Therefore, in order to reduce 3 decibels by weight floor impact sound by weight for weight floor impact sound reduction, for example, it is necessary to make the equivalent mass 600 kg of double weight, and therefore the weight of 300 kg is required. Moreover, since the damping effect by the copper reducer is increased with the increase of the mass of the weight constituting the copper reducer, a weight for reducing the floor-floor impact sound is added, and the damping effect by the copper reducer to the floor becomes heavy. For this purpose, the weight of the copper reducer needs to be heavy, resulting in an increase in the floor weight and loss of the feature that the floor structure is light and simple. In addition, the natural frequency of the dynamic reducer needs to be very close to the natural frequency of the floor structure. Therefore, the natural frequency of the floor structure in which the dynamic reducer is installed is measured every single case, or the numerical analysis is performed on the floor structure of various arrangements in advance. It is practically difficult to predict the natural frequency by implementing it.

Then, an object of this invention is to provide the floor structure which can improve a sound insulation performance, maintaining the frame structure by the metal frame frame material or a beam material.

1 is a top view showing a frame of a floor structure of an embodiment of the present invention;

2 is a cross-sectional view showing a cross-sectional structure of the beam member of FIG.

3 is a cross-sectional view showing a cross-sectional structure of another embodiment of a beam member;

4 is a sectional view showing a cross-sectional structure of still another embodiment of a beam member;

Fig. 5 is a graph showing the relationship between the excitation acceleration and the same mass when the filling amount of the granular material in the beam member is changed;

Fig. 6 is a graph showing reduction of radiated sound by use of noise treatment material.

7 is a side view showing the vibration mode of the floor structure having a frame of frame material and beam member;

8 is a graph showing the results of heavy floor impact sound level measurements;

9 is a graph showing a light floor impact sound level measurement result;

10 is a graph showing the vibration level during hammer strike excitation;

11 is a cross-sectional view showing a cross-sectional structure of still another embodiment of a beam member.

The floor structure of Claim 1 which solves the said subject is a floor structure which has a metal frame frame and the beam material of the metal sibling material which intersects inside this frame, and all or one part of the said beam material shall have a hollow part. And a granular body is accommodated in the hollow portion.

According to the structure of Claim 1, when a granular body is accommodated in the hollow part of a beam material, weight can be increased, maintaining the external shape of frame of a frame material and a beam material. In addition, since the floor vibration after the impact force acts largely with the abdominal part as the abdomen, the effect of reducing the floor-floor impact sound according to the increase in the weight of the beam is effectively exhibited. Moreover, when a granular body jumps in a hollow part by vibration, the damping effect to a floor is exhibited.

For example, when a steel plate having a plate thickness of 1 to 3 mm is used as a frame or beam material, and wood such as structural plywood is used as a floor board, the mass of the floor structure is about 20 to 30 kg / m 2, resulting in light weight. However, when an impact force acts on the floorboards constituting the floor structure, the frame, beams, and floorboards are integrated to start vibration, and the wall surface on which the periphery of the floor structure is fixed also vibrates, so that the floor structure vibrates most. Equivalent mass may be from 100 kg to 300 kg. Thus, the granular body is accommodated in the hollow portion of the beam and the weight of the frame is increased. For example, if 10 kg of granules per 1m are stored in the hollow part of the beams, the room size is 3.64m × 3.64m. In the case of 8 tatami rooms, 36 kg per beam will be provided. The beam is present so that the total weight of the granules is 288 kg. At this time, the equivalent mass m1 after the granular body storage is 588 kg, which is approximately twice that of m0 before installation even at the minimum, and the weight floor impact sound is 10 log (m1 / mo) = 3 decibels. In addition, when vibration exceeding the acceleration of gravity occurs, the granular body leaps inside the hollow portion and repeatedly exerts an impact force in a direction of suppressing the vibration of the floor by repeatedly impacting, thereby exhibiting the vibration effect on the floor.

The floor structure of Claim 2 WHEREIN: WHEREIN: The elastic body or viscoelastic body is sandwiched in all or one part between the inner wall of the said hollow part, and the said granular body. According to the structure of this claim 2, for example, when the beam member is composed of the shaped steel, even when the granular body repeatedly collides in the hollow portion of the beam and gives the impact strength to the shaped steel, impact sound is generated secondarily from the shaped steel. An elastic body or viscoelastic body is between the granular body and the hollow inner wall to prevent the occurrence of secondary impact sound.

In the floor structure of Claim 3, the said elastic body or viscoelastic body of Claim 2 is a bag body accommodated in the said hollow part. According to the configuration of claim 3, for example, a granular body is placed in a cylindrical bag and the elastic body or a viscoelastic body is sandwiched between the granular body and the hollow inner wall by simply placing the bag in the hollow part of the shape member. It becomes the structure to make.

In the floor structure according to claims 4 to 6, the granules are metal-containing, iron-containing, and reduced pellets. According to this configuration, since the reduced pellet is made of iron ore as a raw material, it contains a large amount of iron, which is a metal component, has a large specific gravity, is uniformly shaped, and the granules easily leap, even when the granules collide repeatedly in the hollow part. It is hard to be worn or crushed and exhibits stable vibration damping function. Moreover, since it is after baking, there is little moisture and there is no fear of mold and bacteria propagation after being incorporated into a house. In addition, stable supply is possible, so it can be obtained in large quantities at low cost.

In the floor structure of Claim 7, the said beam member is formed by combining the shape of the groove-shaped cross section so that the said hollow part may become a closed space.

According to this configuration, by forming the groove-shaped cross section in combination, a closed space is easily formed, and the cross-sectional coefficient of the beam member also increases. For example, two groove-shaped steels formed by roll forming from a thin steel plate are sandwiched by opposing concave portions to form hollow portions.

In the floor structure of Claim 8, 9, the floor board is joined to the upper surface of the said frame material and the said beam material. According to this structure, since it is a frame of a soundproof structure, the timber like structural plywood is used for a floor board, and a floor surface can be formed on the frame by site construction etc. In addition, the floorboard is soundproofed, and the soundproofing performance is further improved.

(Embodiment of invention)

Embodiments of the present invention will be described below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the frame of the floor structure of embodiment of this invention, and FIG. 2 is sectional drawing which shows the cross-sectional structure of the beam member of FIG.

In Fig. 1, 1 is a floor structure, 2 is a frame member, 3 is a beam member, and 4 is a floor board. The frame member 2 is a rectangular assembly of two end dog ears 2a and two side dog ears 2b. For example, a groove-shaped, forged steel thin member having a width of 40 mm, a height of 235 mm, and a plate thickness of 1.2 mm is used for the end ear mold 2a and the side ear mold 2b.

The beam member 3 is formed of a dongle frame which is spaced at approximately equal intervals in parallel with the side frame 2b between the end frame 2a, and a steel thin profile of steel is used. Both ends of the beam member 3 are fitted in the grooves of the end ears 2a, and the flanges formed at both ends are fixed to the bottom of the grooves of the end ears 2a so that the beam members 3 are fixed to the frame member 2. Are bonded. The frame 5 of the floor structure 1 is formed by the frame material 2 and the beam material 3. On the frame 5, the floor board 4 is mounted, and the floor board 4 is joined to the frame 5 with the nails 21 or the like to form the floor structure 1. The floorboard 4 is usually joined to the frame 5 at the construction site. In some cases, a set of the frame 5 and the floorboard 4 is produced at the factory and brought into the construction site.

As shown in FIG. 2, the beam member 3 groove | channels the 2nd thin profile member 3b of the rolled groove type | mold steel in the groove | channel of the 1st thin profile member 3a of the rolled groove type | mold. Is inserted so as to face, and forms a hollow portion 11 closed inward. The end of the rib of the first thin mold member 3a is straightened so that the hollow portion 11 is formed by the fitting, while the end of the rib of the second thin mold member 3b is folded inward. For example, the beam member 3 is formed using the shape members 3a and 3b of width 40mm x height 235mm x plate thickness 1.0mm.

In the hollow part 11, an elastic bag 12 of rubber-coated inner and outer surfaces is inserted, and a granular body 13 is filled in the bag 12. Therefore, a structure in which the elastic body or the bag body 12 of a viscoelastic body is interposed between the granular body 13 and the inner walls of the shape members 3a and 3b.

3 shows a cross section of the beam member 103 of another embodiment. Hollow steel is formed from a single plate by a combination of roll forming molding and caulking, and the granular body 113 is accommodated in the hollow portion 111 of the hollow steel. The engaging portion of the beam member 103 overlaps the floorboard 104 and is joined to the tab screw 122. Moreover, although not shown in figure, it is preferable to install the inner side of an elastic body or viscoelastic body on the inner wall of the hollow part 111. FIG.

4 shows a cross section of the beam member 203 of another embodiment. The beam forming material 203 forms the flange 203b on both sides of the opening 203a of the groove by roll forming, and the floorboard 204 of the laminate is placed on the flange 203b, and the nail 221 is used. Both are joined. The closed hollow portion 211 in the beam member 203 is formed jointly with the floorboard 204. The granular body 213 is accommodated in this hollow part 211. In addition, although illustration is abbreviate | omitted, it is preferable that the granular body 213 is accommodated in the hollow part 211 as a state which entered into the bag of an elastic body or viscoelastic body.

The granular bodies 13, 113 and 213 accommodated in the beams 3, 103 and 203 can be used as long as they satisfy the conditions of being heavy, inexpensive, uniform in shape and no change in aging. Especially, since it contains a lot of iron, specific gravity becomes heavy. Reduced iron pellets, slag (eg blast furnace slow cooling slag, blast furnace granulated slag, converter slag, converter slag, etc.), reduced pellets, jade iron, sintered steel, cold pellets (by cement) Iron, dust, flash ash or the like solidified into pellets) or the like is preferable as the granular body 13. In particular, the reduced pellets are particularly preferred because they can be obtained at low cost, the particles are uniformly sized, and they are calcined, so that the moisture content is small and the specific gravity is high.

The degree of filling of the granular bodies 13, 113, and 213 accommodated in the beams 3, 103, and 203 is allowed from a substantially full state to a state in which there is a space upwards, if the flow collision of the granular bodies 13, 113, and 213 is possible. When the weight increases, the granules 13, 113, and 213 in the hollow portions 11, 111, and 211 can be filled approximately enough to repeat the collision.

Three kinds of granules of converter slag, blast furnace slag and reducing pellet were obtained by excitation test, and the relationship between the particle diameter, the filling amount and the equivalent mass was obtained, and the ratio of the equivalent mass to the filling amount was the largest. Determinants of the type, particle diameter, and filling amount of the encapsulated particles in the section dongle steel were found. In addition, various granular bodies are enclosed in a box-section dongle steel cut to a length of 220 mm, attached to a 30 kgf exciter through an impedance pellet, subjected to a sine wave small vibration, and a vibration with excitation force. By calculating the transfer function from the acceleration using the FFT, a dynamic mass aimed for the vibration damping effect in the frequency domain of interest was obtained. As a result, the big difference in the dynamic mass according to the type of granular body was not recognized. because that. The particle size is provided uniformly, and the use of cheaper reducing pellets is preferable. The particle diameter of converter slag is widely distributed from less than Φ5mm to more than Φ22mm, but the difference in vibration damping effect by particle diameter is less than Φ5mm in 31.5Hz band (22.4 ~ 44.7Hz), and it is damped at other particle diameter. The effect was approximately the same.

In Fig. 5, a reduction pellet is employed as the granular body, and the excitation acceleration and the same mass in the case of approximately 3.95 kg of filling amount, the case of 3.3 kg of filling amount with a little space, and the case of 2.2 kg of filling amount with a considerable space Indicates the relationship between According to this, the copper mass aimed at the excitation effect tends to be proportional to the excitation acceleration and does not depend on the filling amount. For example, due to the tire drop used as the excitation source for the heavy floor impact test, the upper part is leaped without exertion depending on the filling amount of the granular body and exhibits a damping effect, and the remaining part is not leaped, and the heavy floor impact sound is reduced. It acts as a weight of the dragon. Therefore, what is necessary is just to determine the filling amount from the weight of weight required for reduction of a floor-floor impact sound.

An elastic body or viscoelastic body interposed between the inner walls of the hollow portions 11, 111, 211 and the granular bodies 13, 113, 213 is arranged by attachment to the inner wall or insertion of a bag-shaped cylinder. The elastomer or viscoelastic material can be used as long as it exhibits elasticity or viscoelasticity such as a resin or rubber coating on the surface of the core fiber, a resin sheet, a rubber sheet, a thick cloth, or the like.

As examples of elastomers or viscoelastic bodies, available rubber sacks and thick drain hoses were used. 2.2 kg of reducing pellets were filled with rubber or a hose, sealed with a beam material, and the noise generated when the beam had a beam material was measured by installing a sound level meter at a point of 10 mm from the jig surface. The result is shown in FIG. With the rubber sack and drain hose, the radiation noise level is lower than in the case where there is no, but the drain hose has a little less noise than the rubber sack. In addition, it was measured by using a bag of breathable fibrous textile cloth without the coated fabric of the core fiber + surface resin, the cloth coated with the core fiber + surface rubber material, the rubber sheet, the surface coating, etc. The same also showed a decrease in the radiation noise, and was usable as an elastic body or a viscoelastic body.

From the above experimental results, it is preferable that the Young's modulus of the elastic body or the viscoelastic body is a polymer material of 1 * 106 (Pa) to 1 * 109 (Pa). Moreover, it is preferable that an elastic body or viscoelastic body is a foaming material. Moreover, it is preferable that the loss coefficient of a viscoelastic body consists of a polymeric material of 0.05-5.0. Moreover, it is preferable to form a cylindrical bag structure using an elastic body or viscoelastic material, and to enclose a granular body in this bag structure. Moreover, it is preferable to arrange this cylindrical bag structure side by side in the longitudinal direction, and to provide it to the said cylindrical hollow part. Moreover, it is preferable to arrange this cylindrical bag structure side by side in the height direction of a floor structure, and to provide it to the said hollow part.

Next, the measurement result of the floor impact sound of the floor structure mentioned above is demonstrated below. Fig. 7 shows the vibration mode of the floor structure in which seven beams are placed at intervals of 455 mm in a frame for eight tatami pieces of 3.64 m by 3.64 m. In any of the tertiary mode, quaternary mode, and fifth mode included in the 63 Hz octavo band (44.7 to 89.1 Hz) for determining the floor-floor impact sound insulation performance, the amplitude of the beam is large. Therefore, the unbound portion of the granular body put into the hollow part inside the beam member works effectively as an effect of weight which reduces the floor-floor impact sound, and the jumping portion effectively acts as an effect of imparting damping to the floor. It is judged to work. In addition, although granular bodies may be put on all sides of the flooring material, the granular bodies only work in part, and the efficiency becomes poor. In particular, the granular body works effectively when the granular body is put into the beam member which becomes the abdomen of vibration, even without putting the granular body in all the beam members.

Floor structure of the present invention, comprising three hollow beams of 455 mm intervals in a frame for 8 pieces of tatami (3.64m × 3.64m), and putting 36 kg of reducing pellets per beam. The weight floor impact sound level is shown in FIG. 8, the light floor impact sound level is shown in FIG. 9, and the vibration level (hammer amplitude per unit vibration force) when hammer strikes is shown in FIG. In addition, in FIG.8 and FIG.10, for comparison, the data of the boundary floor 1 which used the heavy concrete floor and the weight of the boundary floor 2 which installed the dynamic damper after installing a weight on a beam are written together. Doing. In addition, the boundary floor 1 and the boundary floor 2 both ensure the LH65 grade of JIS (A) 1418.

In the heavy floor impact sound rating shown in Fig. 8, the granular body encapsulation example has the same level as the boundary floor 1 and the boundary floor 2, and can be used practically. In the lightweight floor impact sound rating shown in Fig. 9, the level of granular encapsulation is a level that can be used practically by arranging a cushion material such as a resin material or a nonwoven fabric on the flooring material and using the flooring as a surface material together with the soundproof flooring. Go down. According to the hammer striking vibration level of FIG. 10, the vibration of about 10 decibels is lowered compared to the base boundary floor which is not subjected to any treatment, and the vibration damping level is approximately the same as that of the boundary floor 1 and the boundary floor 2. It works.

In addition, embodiment mentioned above can be changed and implemented as follows.

(1) Although it is preferable to accommodate a granular body in all of the beams, a granular body can also be accommodated in a part of multiple beams or a part of the longitudinal direction of a beam. Depending on the vibration mode of the floor structure, a portion for storing the granular body may be selected.

(2) The beams may not be limited to the donkey frame, but may be attached to the yoke frame in a straight direction, and may have a portion corresponding to the yoke (joint support bar) used when placed in a lattice shape. As a hollow shape member, a granular body can also be accommodated. Moreover, a granular body can also be accommodated using a frame material as a hollow shape material.

(3) For example, when the beam member is made of a material having a vibration damping effect such as a damping steel sheet having a sandwich structure sandwiched with two sheets of steel, the elastic body or the viscoelastic body arranged in the hollow part of the beam member may be omitted. Can be.

(4) The frame member and the beam member are not limited to steel materials but may be made of aluminum alloy. The mold member forming the frame member and the beam member is not limited to roll forming, but may be an extruded molded article.

(5) Secondary noise generated from the beam due to the operation of the granular body is prevented by the ceiling and the interior space of the ceiling, such as when the sound absorbing material such as glass fiber is filled in the space inside the ceiling directly below the boundary floor. In this case, the elastic body or the viscoelastic body arranged in the hollow portion of the beam member can be omitted. (6) The hollow part of the beam member is not limited to the thing closed in cooperation with the beam member itself or a floor board like FIG. As shown in Fig. 11, the beam member 303 may be a C-shaped cross section, and the bottom recess may be a hollow portion. In this case, the granular body 313 may be put in the bag body 312, and the bag body 312 may be caught by the recessed part so that it may not fall from a hollow part. In addition, the beam member may have a U-shaped cross section and may be fixed with a wire so that the bag containing the granular body does not fall from the opening.

According to the invention described in claim 1, by enclosing the granular body in the hollow portion of the beam member, it is possible to exhibit excellent sound insulation effect while maintaining the basic structure of the frame member and the beam member. Compared with the soundproof treatment on the front surface of the floorboard, the whole can be produced at low cost. Moreover, since there is no restriction | limiting of a floorboard, it can use combining various floorboards, such as a synthetic wood. In addition, since the sheet member can be used for the frame member and the beam member, it can be applied to steel houses and the like that can be installed on-site.

According to invention of Claim 2, generation | occurrence | production of the secondary impact sound produced by the vibration in the inside of the beam member of a granular body can be prevented.

According to the invention of claim 3, since the cylindrical bag containing the granular body is inserted into the beam member, a plurality of bag bodies are arranged in series in the longitudinal direction of the beam member, or a plurality of bag bodies are laminated in the height direction of the beam member. In addition, the granular body can be accommodated simply and in place inside the beam.

According to the inventions of claims 4 to 6, an inexpensive granule having an effective soundproofing effect can be used.

According to the invention of claim 7, it is possible to easily obtain a beam member having a closed inner space.

According to the invention of Claims 8 and 9, the floorboard can be freely selected, and the soundproofing effect is increased by the soundproof flooring.

Claims (9)

A floor structure having a frame member made of a metal member and a beam member made of a metal member which is crossed over the inner side of the frame member, wherein all or part of the beam member has a hollow portion, and the granular body is accommodated in the hollow portion. Floor structure characterized by. The floor structure according to claim 1, wherein an elastic body or a viscoelastic body is interposed between all or part of the inner wall of the hollow portion and the granular body. The floor structure according to claim 2, wherein the elastic body or viscoelastic body is a bag body accommodated in the hollow part. The floor structure of claim 1, wherein the granular material is a metal material. The floor structure according to claim 1, wherein the granular material is iron-containing material. The floor structure according to claim 1, wherein the granules are reduced pellets. The floor structure according to claim 1, wherein the beam member is formed by combining a shape of a groove-shaped cross section so that the hollow portion becomes a closed space. The floor structure according to claim 1, wherein a floor board is joined to the upper surface of the frame member and the beam member. 9. The floor structure according to claim 8, wherein said floor board is a soundproof flooring.