JP4329124B2 - Floor slab reinforcement device - Google Patents

Description

  The present invention relates to a floor slab reinforcing device that reinforces a floor slab to which a load is applied and a method for reinforcing the floor slab reinforcing device.

  In order to reinforce the floor slab against the load applied to the floor slab, in the case of a new building, it can be dealt with by taking measures such as installing joists on the floor slab or thickening the floor slab. There is a problem. That is, as the floor slab joists and the thickness of the floor slab increase, it becomes heavier. When the joists are installed, the shape becomes complicated and the construction becomes complicated. Also, taking into account uncertain factors such as an unexpected load that is different from the design time leads to overdesign.

  On the other hand, in the case of existing buildings, there is a problem that a new load is applied to the floor slab when environmental conditions change due to refurbishment such as changing the partition. There is a problem of vibration. On the other hand, a method of increasing the rigidity of the floor slab by applying an iron plate under the floor slab to form an embedded form, filling the non-shrink mortar between the iron plate and the floor, and increasing the thickness of the floor slab. is there.

  However, in this method, installation of iron plates and placement of mortar under the floor slab takes time and effort, and in particular, in mortar placement between the floor slab and the iron plate, filling is difficult. There is concern about things going wrong. In addition, since the span of the floor slab does not change, the bending stress increases when the thickness is increased. Furthermore, when viewed over a long period of time, it is questionable that the existing floor slab and the thickened part will be seen as an integral structure.

  In order to reinforce the floor slab without taking measures such as increasing the thickness of the floor slab, and in particular to prevent vibration of the floor slab, an additional beam (steel beam) is placed in parallel below the floor slab. In addition, a damping structure (for example, Patent Document 1) is proposed in which a damping material made of a viscous material or a viscoelastic material is interposed between the additional beam and the floor slab, and the damping material is sandwiched between the floor slab and the additional beam. Has been.

  However, this damping structure is not a structure in which the damping material supports the floor slab. Therefore, the span of the floor slab is basically unchanged, the bending stress generated in the floor slab cannot be reduced, and the floor slab vibrates. It remains easy to do. In addition, when the damping material is used, the cost is higher than that of a general material, the mounting adjustment is complicated, and problems such as deterioration due to long-term use are expected.

Therefore, as a method of reinforcing the floor slab without using a damping material, the flat bottom surface of the inclusion having a tensile material support groove on the top surface is formed on the lower surface of the floor slab that is bent downward. A vibration obstacle reducing method for lifting the deflection of the floor slab by abutting and tensioning the tension material passing through the support groove between the floor slab portions with high rigidity and little deflection located on both sides of the floor slab. There is literature 2).
JP-A-10-299824 Japanese Patent Laid-Open No. 10-205044

  In Patent Document 2, it is described that the floor rigidity can be changed by adjusting the tension applied to the tension material, but the change in the tension of the tension material in the horizontal direction is caused by the longitudinal inclusion. Since it is converted into a force for lifting the floor slab, it is expected that the adjustment becomes complicated.

  In addition, when a plurality of interpositions are arranged in the tensile material, it is difficult to adjust the force for lifting the floor slab by a plurality of inclusions, and in order to adjust, at least one tensile material is required for one interposition. It becomes. Furthermore, the tension of the tensile material is used only for the force that pushes up the inclusions, which is effective for lifting the deflection, but has an inferior anti-vibration effect.

  An object of the present invention is to provide a floor slab reinforcing device and a method for reinforcing the same, which are excellent in workability on site and can easily adjust the force for pressing the floor slab. In addition, an object of the present invention is to provide a floor slab reinforcement device excellent in vibration preventing effect and its reinforcement method.

The invention of claim 1, a reinforcement device that reinforces under the floor slab relative to the load applied to the floor slab lying between the beams, the said beams floor slabs is integral structure, provided between the beam A string member, and a jack that holds the floor slab so that a load is applied to the string member , and attaches an attachment member to the beam, and the attachment member is used to attach the string member under the beam. When a body is attached and a force for pushing up the floor slab by the jack is applied, a tensile force acts on the string-like body, and a tensile force acts on the upper surface side of the floor slab via the beam It is.

The invention of claim 2 is such that the jack is mounted on the string-like body .

The invention of claim 3 is one in which prestress is applied to the string-like body .

According to a fourth aspect of the present invention, the jack is a rotary type having a male screw.

In the invention of claim 5 , the floor slab is an existing structure.

According to a sixth aspect of the present invention, the load is a load due to vibration.

  According to the configuration of the first aspect, since the load applied to the floor slab is pressed by the jack, the span of the floor slab is shortened, the floor slab is reinforced, and vibration is not easily generated particularly in the floor slab. In addition, jacking up gives prestress to the floor slab, ensures reinforcement, and suppresses the generation of vibrations. Further, since the jack is used as it is, the insufficient prestress amount accompanying the relaxation of the member or the change of the working load can be easily adjusted at any time by the jack, and maintenance management becomes easy.

And since it can be applied to existing structures, a new load is applied to the floor slab. Based on this, vibration can be easily installed even when it is understood after a while. . In addition, even with a new structure, it is possible to cope with stresses that are insufficient at the floor slab by being provided at a necessary place, and to prevent occurrence of vibration. Furthermore, since the string-like body is attached between the beams in both the existing and new installations, it can be easily attached to any place.

Also, when a force that pushes up the floor slab with a jack is applied, a tensile force acts on the string-like body, and since the beam and the floor slab are an integral structure, a tensile force acts on the upper surface side of the floor slab via the beam, Thus, the load applied to the floor slab is dealt with and acts in the direction of suppressing the generation of vibration.

  Moreover, according to the structure of Claim 2, a jack can be attached simply.

According to the third aspect of the present invention, when installing the string-like body by applying prestress, the load of the floor slab, particularly the generation of vibration, is reliably supported by the string-like body via the jack.

Moreover, according to the structure of Claim 4 , since a jack can be easily obtained as a commercial item by using a rotary type jack, and since operation is easy, it becomes a simple and cheap construction method.

Further, according to the configuration of claim 5 , even if the load of the floor slab, particularly the occurrence of vibration, is known after a long time after completion of the structure, it can be easily attached and the existing structure The load of the floor slab, especially the generation of vibrations can be suppressed.

Moreover, according to the structure of Claim 6 , since it limited to a vibration especially as a load, the response | compatibility to a dynamic load becomes easy.

  In addition, pre-stress means applying a stress opposite to the applied load before the applied load is applied to the members such as the support material and the floor slab. The prestress may be applied either before or after the member such as the support member is installed at a predetermined location.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, by adopting a new floor slab reinforcement device different from the conventional one, an unprecedented floor slab reinforcement device is obtained, and the floor slab reinforcement device and its reinforcement method are described respectively.

Hereinafter, reference examples of the present invention will be described with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention. As shown in FIG. 1, the structure 1 includes concrete columns 2, 2, 2, and 4 on four sides, adjacent columns 2, 2, 2. 2 and 2 are connected by concrete beams 3, 3, 3 and 3, and a concrete floor slab 4 is integrally formed with the pillars 2, 2, 2 and 2 above the beams 3, 3, 3 and 3. Is provided. The floor slab 4 is also provided continuously outside the pillar 2. And the said pillar 2 and the beam 3 are lower structures. If a concrete wall (not shown) is provided in place of the beam 3, this wall also becomes a lower structure.

  The floor slab 4 and the lower structure beam 3 are both made of concrete and have an integral structure. Moreover, when the beam 3 which is a lower structure consists of H-shaped steel etc., the upper part of the H-shaped steel shall be embed | buried in the floor slab 4, or the upper part shall be fixed and integrated.

  The reinforcing device 11 reinforces the floor slab 4 with respect to a load applied to the floor slab 4, for example, an overload, particularly a load due to vibration, and includes a support member 12 and a jack 13. In this example, a rigid beam is formed by using steel, wood, or the like for the support member 12. As shown in FIG. 2, a plurality of (two) support members 12 are attached at intervals in the length direction of the beam 3 to be attached. Further, as shown in FIG. 1, the support member 12 is attached between the beams 3 and 3 facing each other at a predetermined distance from the lower surface of the floor slab 4. In this way, by separating the support material 12 from the lower surface of the floor slab 4 by a predetermined distance, a space for attaching the jack 13 can be provided between the support material 12 and the floor slab 4. Thus, a tensile force is applied to the upper surface side of the floor slab 4 to act in a direction to suppress the load on the floor slab 4, particularly vibration generation. In FIG. 1, the support material 12 is attached to the floor slab 4 in parallel, but the support material 12 may be attached to the floor slab 4 obliquely. Further, it is preferable to reinforce the iron plate or the like on the portion of the beam 3 to which the support member 12 is attached.

  The support material 12 constituting the rigid beam is made of hot rolled steel such as L-shaped steel or H-shaped steel, and special steel can be used as necessary, or a concrete beam or the like may be used. The hot-rolled steel material is a general commercial product. The support member 12 is directly attached to the beam 3 by attachment means 14 such as an anchor bolt. In FIG. 1, a mounting plate 15 is integrally provided at the end of the support member 12, and the mounting plate 15 is fixed to the beam 3 by mounting means 14 which is a hole-in anchor. In addition to mounting directly fixed in this way, a bracket (not shown) is attached to the beam 3, and the end of the support material 12 is installed on the bracket, so that the support material is provided between the beams 3 and 3. 12 may be installed.

  The support member 12 is a beam member supported at both ends between the beams 3 and 3, and when the length adjustment is necessary when mounting between the beams 3 and 3, it is divided into two or more pieces in the length direction. The divided parts are joined and used. Further, when the span between the beams 3 and 3 is short and the jack 13 can be held diagonally and the floor slab 4 can be held, it is not necessary to use the support 12 over the entire length of the span. Install and use as a cantilever. Furthermore, when prestress is applied to the support member 12, that is, a compressive force is applied to the lower side of the cross section and a tensile force is applied to the upper side of the cross section before the upper load applied to the floor slab 4 is applied, the amount of deflection of the support material 12 is reduced.

  The jack 13 is a manual rotary type that does not use a power source. For example, as shown in FIG. 3, a hollow column 132 is erected integrally with a plate-like lower base portion 131, A lower part of the male screw rod 133 is inserted, an operating body 134 larger than the support 132 is screwed into the male screw rod 133, and a plate-like upper base portion 135 is fixed to the upper end of the male screw rod 133. By rotating the operating body 134 while sliding on the upper end of the column 132, it is possible to adjust the projecting dimension of the male screw bar 134 from the upper end of the column 132 and to extend and contract the jack 13. Thus, the rotation type means that the member is rotated and converted into the movement of the male screw rod 133 as a member by the screw. In this example, the jack 13 is installed directly on the support member 12 so that the upper load of the floor slab 4 is applied. Alternatively, the jack 13 may be placed at a position where the support member 12 is suspended. As the jack 13, a jack for a support work is used, and as a jack for a support work, there are a commercially available product such as a giraffe jack and a jack for a scaffold, and a jack that moves up and down by manually rotating a member is used. Thereby, it becomes a simple and inexpensive construction method. In addition, you may use the jack which requires power sources, such as an electric type and a hydraulic type, as needed. The jack 13 is arranged with its expansion / contraction direction aligned with the vertical direction for efficient use. In addition, as above-mentioned, when the span length of the floor slab 4 is short, it is good also as a diagonal arrangement | positioning by placing a fulcrum in the beam 3. FIG. The jack 13 is provided with an appropriate anti-rotation measure so as not to rotate backward due to vibration after adjustment. In this case, it is assumed that the jack 13 can be actuated again by releasing the anti-rotation measure even after taking the anti-rotation measure. Further, a punching shear works as a supporting pressure on the floor slab 4 where the upper surface of the jack 13 hits. For this reason, it is possible to prevent the floor slab 4 from cracking by using the upper base portion 135 which is a steel plate having a constant area.

  When an electric jack is used, a measuring means for measuring the force applied to the jack is provided, and while the force applied to the jack is measured by this measuring means, a plurality of jacks can be automatically adjusted and jacked up. .

  In the construction, a support member 12 is attached between the beams 3 and 3, a jack 13 is attached on the support member 12, the jack 13 is extended, and an upper load applied to the floor slab, particularly a load due to vibration is measured. Based on this measurement data, the length of the plurality of jacks 13, 13,... Is adjusted to obtain an effect of suppressing the overload applied to the floor slab, particularly the generation of vibration.

  In addition, when an electric jack is used, a measuring means for measuring the force applied to the jack is provided, and while the force applied to the jack is measured by this measuring means, a plurality of jacks can be automatically adjusted and jacked up. .

  Since the generation of the floor slab vibration is caused by the vertically downward exciting force, when the downward exciting force is applied to the floor slab 4 by applying an upward force to the floor slab 4 in advance by the jack 13, Thus, the vibration of the floor slab 4 can be effectively reduced. Further, in the present reinforcing device 11, excellent effects such as light weight of the structure, low cost, short construction period, and easy construction can be obtained.

As described above, in this reference example, the reinforcing device 11 reinforces a load applied to the floor slab 4 between the beams 3 and 3 , for example, an upper load, under the floor slab. Since it has an integral structure and includes a support member 12 provided between the beams 3 and 3 and a jack 13 that holds the floor slab 4 so that a load is applied to the support member 12, an upper load of the floor slab 4, especially vibration The load by the jack 13 is pressed by the jack 13, the span of the floor slab 4 is shortened, and the load on the floor slab 4 is dealt with. In particular, vibration is less likely to occur. Further, by jacking up, prestress is applied to the floor slab 4, and generation of vibration can be suppressed. Furthermore, since the jack 13 is used as it is, the amount of insufficient prestress associated with the relaxation of the member or the change of the working load can be easily adjusted at any time by the jack 13, and maintenance management becomes easy.

  And since this reinforcement device 11 can be applied to existing structures, it can be easily installed even when the overload of the floor slab, especially the occurrence of vibration, is known after a while after the structure is completed. Can do. In addition, even in a newly-installed structure, it can be provided at a necessary location to cope with an overload, and in particular, generation of vibration can be prevented. Furthermore, since the support member 12 is attached between any of the beam 3, the wall, and the pillar 2 in both the existing and new installations, the support member 12 can be easily attached to any place.

In this way, in this reference example, since the jack 13 is mounted on the support member 12 in accordance with the second aspect, the jack 13 can be easily mounted.

In this way, in the present reference example, the support member 12 is secured to the beam 3 as the lower structure at both ends thereof at a position away from the lower surface of the floor slab 4, thereby securing a mounting space for the jack 13. Further, since the beam 3 is integrated with the floor slab 4, a tensile force acts on the upper surface side of the floor slab 4 through the beams 3 and 3, and a direction to suppress an overload applied to the floor slab 4, particularly vibration generation. Act on.

Also, in this way the reference example, supporting lifting member 12 is steel, because it is rigid beams such as wood, load due to vibration of the floor slab 4 is reliably supported by the support member 12 through a jack 13.

In this way, in this reference example, in correspondence with claim 4 , the jack 13 is a rotary type having a male screw. Therefore, by using the rotary type jack 13, it can be easily obtained as a commercial product, In addition, since the operation is simple, the construction method is simple and inexpensive.

In this way, in this reference example, the floor slab 4 is an existing structure corresponding to the fifth aspect . Therefore, the overload applied to the floor slab, particularly the generation of vibrations, takes time after completion. Even when it is found out, the reinforcing device 11 can be easily attached, and it is possible to cope with the overload applied to the floor slab 4 of the existing structure, and particularly to suppress the generation of vibration.

In this way, in this reference example, in correspondence with claim 6 , since the load is a load due to vibration, it is easy to deal with a dynamic load.

In this way, the present reference example is a floor slab reinforcement method for reinforcing a load applied to the floor slab 4 between the beams 3 and 3 as the lower structure, for example, an upper load under the floor slab. The lower structure is one of the beam 3, the wall, and the column 2 fixed to the floor slab 4. In this example, the beam 3 is a beam 3, and the support material 12 is provided between the beams 3 and 3. After the jack 13 is attached to the position where the load is applied, the pressure applied to the jack 13 is controlled to reinforce the floor slab 4 against the overload applied to the floor slab 4, and particularly the vibration is controlled. Regardless of the structure, and whether it is a single jack or a plurality of jacks 13, by adjusting the pressure applied to the individual jacks 13, it is possible to optimize the generation of an overload applied to the floor slab 4, particularly vibration. Things can be controlled.

Also, as an effect on the reference example, since a plurality of jacks 13 are arranged between the beams 3 and 3, the span of the floor slab 4 is shortened. In this example, since two jacks 13 are arranged, the span is 3 minutes. The acting stress applied to the floor slab 4 is reduced. Further, a structure in which vibration is difficult to occur can be obtained. Furthermore, when an electric jack is used, a measuring means for measuring the force applied to the jack is provided, and while the force applied to the jack is measured by this measuring means, a plurality of jacks can be automatically adjusted and jacked up. . The reinforcing device 11 of the present reference example is a vibration damping device that suppresses the vibration of the floor slab 4 between the lower structures under the floor slab, and the reinforcing method of the present reference example includes a floor One of the beam 3 and the wall or the column 2 fixed to the slab 4, which is the beam 3 in this example, a support member 12 is provided between the beams 3 and 3, and a jack 13 is provided at a position where a load is applied to the support member 12. This is a floor slab vibration control method for controlling the vibration of the floor slab 4 by adjusting the pressure applied to the jack 13 after mounting, and the vibration of the floor slab 4 can be effectively prevented.

4 to 7 show Embodiment 1 of the present invention. The same reference numerals are given to the same parts as those in the above-described reference example, and detailed description thereof will be omitted. In this example, a support made of a string-like body is used. When the support 12A is used, if a force for pushing up the floor slab 4 by the jack 13 is applied, a tensile force acts on the support 12A, and the beam 3 and the floor slab 4 are integrated. Therefore, a tensile force is applied to the upper surface side of the floor slab 4 via the beams 3 and 3, thereby dealing with an overload applied to the floor slab 4 and acting in a direction to suppress generation of vibration. In this example, an interpolation material is combined with a support material 12A made of a string-like body, and the jack 13 is arranged on the interpolation material.

  The support member 12A that is a string-like body is an elastic material such as a wire rope or a tie rod. In construction, there are a method of using the support member 12A in a suspended state where no pretension is applied, and a method of using the support member 12A with a pretension applied. As shown in FIG. 6, a substantially U-shaped attachment member 21 is attached to the beam 3, and this attachment member 21 connects the lower portions of both side slope portions 22, 22 with a bottom plate portion 23. The beam 3 is sandwiched from both sides, and the side slope portion 22 is attached to the beam 3 by attachment means 14 which is a hole-in anchor, and a pair of attachment receiving portions 24, 24 provided at the lower portion of the bottom plate portion 23 are Support material 12A is fixed. In FIG. 6, the support member 12A is attached under the beam 3 using the attachment member 21, but if there is no problem in terms of member stress, a hole may be formed in the side surface of the beam 3 to attach the support member 12A. In this case, it is preferable to reinforce the periphery of the hole on the side surface of the beam 3 or the entire beam 3 with a reinforcing material such as an iron plate.

  Prestress can be applied to the support material 12A. For example, fixing holes 24A and 24A are formed in the mounting receiving portions 24 and 24, the end portions of the support member 12A are inserted into the fixing holes 24A and 24A, and the end portions inserted from the outer mounting receiving portions 24 are pulled. In this state, the end portion is fixed by the fixing tool 25, so that prestress, that is, pretension in this case, can be applied. The fixing device 25 may be a well-known one having a structure such as fixing an end portion by a wedge action. The pretension may be before the installation of the jack 13 or after the installation as long as the preload is applied to the floor slab, or may be adjusted while the apparatus is moving after the adjustment of the jack 13 is completed. As described above, since the beam 3 and the floor slab 4 have an integral structure by applying the pretension to the support member 12A, a tensile force acts on the floor slab 4 via the beam 3. When a load due to vibration is applied, a stronger tensile force is generated in the floor slab 4 and acts synergistically as a force for suppressing the vibration.

  As shown in FIG. 5, a plurality of support members 12A are provided between the beams 3 and 3, and a plurality of support members 12A, 12A, 12A and an interpolating material 31 in the crossing direction are provided. The interpolating material 31 is made of hot-rolled steel such as H-shaped steel, L-shaped steel, groove-shaped steel, or flat steel, and special steel can be used as required, or a string made of an elastic material such as a wire rope or tie rod. The support member 12A may be used. That is, the support material 12A in one side direction and the support material 12A in the other side direction intersecting with the support material 12A may be used in combination as the interpolation material 31. The hot-rolled steel material is a general commercial product. The position of the jack 13 is limited only by the support material 12A, whereas the jack 13 can be installed at an arbitrary position by using the interpolation material 31 and the arrangement of the interpolation material 31. The interpolating material 31 is used to increase the lateral resistance of the supporting materials 12 and 12A. Therefore, it is particularly effective when the string-like support material 12A is used, but is unnecessary when the interpolation material 31 is not required. And when attaching the jack 13 directly on the support material 12A of a string-like body, the jack 13 can be stably attached if two support materials 12A are used in parallel.

  FIG. 7 shows an example of attachment of the interpolation material 31 to the support material 12 </ b> A, and two L-shaped steels 32 and 32 are used as the interpolation material 31. Two L-shaped steels 32, 32 are arranged in parallel with the support material 12A in the crossing direction, and these parallel L-shaped steels 32, 32 are attached on the support material 12A by clips 33 with their inner pieces 32A, 32A. Place the outer piece upright. Then, the lower base portion 131 of the jack 13 is placed on the inner pieces 32A, 32A, and is fixed with bolts and nuts as necessary. The upper base portion 135 of the jack 13 is fixed to the lower surface of the floor slab 4 by attachment means 14 such as a hole-in anchor.

Thus, in this embodiment, the response rate the same operation and effect as the above Reference Example, also, in response to claim 1, the beam 3 and the floor slab 4 is integral structure, provided between the beam 3 and 3 12A, and a jack 13 attached to the floor 12 to hold the floor slab 4 so that a load is applied to the support member 12A. A mounting member 21 is attached to the beam 3, and the beam 3 is used by using the mounting member 21. When the support material 12A is attached underneath and a force for pushing up the floor slab 4 by the jack 13 is applied, a tensile force acts on the support material 12A, and a tensile force acts on the upper surface side of the floor slab 4 via the beam 3. Therefore, a tensile force is applied to the upper surface side of the floor slab 4 via the beams 3 and 3, thereby dealing with an overload applied to the floor slab 4 and acting in a direction to suppress generation of vibration.

Further, in the present embodiment in this manner, supporting lifting member 12A, since a string-like member such as wire rope, tie rods, downward force of the floor slab 5 is to generate a tensile force to the support member 12A is a string-like body By the elastic damping action, it is possible to obtain the effect of suppressing the overload applied to the floor slab 4, particularly the generation of vibration of the floor slab 4.

In this way, in this embodiment, corresponding to claim 3 , since the prestress is applied to the support member 12A as the string-like body, that is, in this case, the pretension is applied, the tensile force is applied to the upper surface side of the floor slab 4. Acts positively and acts in a direction to suppress the overload applied to the floor slab 4, in particular the generation of vibrations.

  Further, as an effect of the embodiment, the supporting member 12A is attached to the lower side of the beam 3, the mounting position is away from the floor slab 4, and the supporting member 12A is pre-tensioned, whereby the beam 3 and the floor are provided. Since the slab 4 has a monolithic structure, a large tensile force is generated on the upper surface side of the floor slab 4, and it is possible to effectively suppress the loading load, particularly vibration.

FIG. 8 shows another reference example of the present invention. The same reference numerals are given to the same parts as those of the above-described embodiments, and detailed description thereof will be omitted. Sensor 36 is used. A vibration meter is used as the sensor 36, and the shape is a cube of about 10 cm square. The sensor 36 measures speed, acceleration, displacement, etc., and calculates the amplitude and frequency of vibration based on these measured values. The sensor 36 is usually installed at the center of the upper surface of the floor slab 4, but when the span between the beams 3 and 3 is long and the floor slab 4 is wide, a plurality of sensors 36 are arranged at appropriate positions. Further, when there is a problem in the measurement or installation on the upper surface of the floor slab 4, it is embedded in the floor slab 4. The measurement by the sensor 36 is performed appropriately according to the purpose such as regular, regular, and repair. Furthermore, the display of the sensor 36 may be directly read visually, or the measurement data of the sensor 36 may be sent to a computer or the like for display.

  As a control procedure, the data of the sensor 36 is analyzed, the control amount of the individual jack 13 is calculated, and the expansion / contraction (up / down) of the jack 13 is controlled based on this calculated value. In the analysis, the position of the sensor 36, the physical properties (for example, the natural frequency) of the floor slab 4 and the position of the jack 13 are previously input and stored in the control means 37 such as a computer. The expansion / contraction (up / down) amount of the jack 13 is calculated based on data such as speed, acceleration, and displacement, and if the jack 13 is an electric type, the expansion / contraction of the jack 13 is controlled by the control means 37.

  When the jack 13 is manually controlled, the measured value of the sensor 36 is visually read, the measured value is analyzed, the amount of expansion / contraction (up / down) of the jack 13 is calculated, and the jack 13 is controlled manually. Therefore, the type of jack does not matter.

  On the other hand, in the automatic control using the control means 37 described above, the data of the sensor 36 is sent to the control means, the control means 37 stores the data and analyzes the data, and sends an electric signal of a control amount to each jack 13, The jack 13 is automatically controlled. When automatic control is performed as described above, the jack 13 is operated by an electric signal such as an electric type, an electromagnetic type, a pneumatic type, or a hydraulic type. Note that the time from the measurement by the sensor 36 to the actual operation of the jack 13 may be simultaneous or after a predetermined time has elapsed.

As described above, in this reference example, the sensor 36 for detecting the state of the floor slab 4 is provided, and the amplitude and frequency of the vibration of the floor slab are calculated from the detection data of the sensor 36, and the individual data is calculated based on the calculated data. By adjusting the jack 13, the generation of floor slab vibration can be controlled to an optimum value.

In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible. For example, the position and number of jacks provided on one support member, the position and number of jacks with respect to the entire floor slab, and the like can be selected as appropriate, and may be one or two or more .

It is sectional drawing of the floor slab which shows the reference example of this invention, and a reinforcement apparatus. It is a plane explanatory drawing same as the above. It is a front view of a jack same as the above. It is sectional drawing of the floor slab which shows Example 1 of this invention, and a reinforcement apparatus. It is a plane explanatory drawing same as the above. It is sectional drawing of the principal part same as the above. It is a front view which shows the attachment state of a jack same as the above. It is a block diagram which shows the other reference example of this invention.

1 Structure 2 Pillar (under structure)
3 Beam (under structure)
4 Floor slab
11 Reinforcing device
12A Support material (string)
13 Jack
133 Male screw rod
21 Mounting member
31 Interpolating material

Claims (6)

A reinforcement device for reinforcing under the floor slab relative to the load applied to the floor slab lying between the beam, the beam and the a floor slab integral structure, a string-like body which is provided between said beam, said A jack that presses a floor slab and is attached so that a load is applied to the string-like body , and an attachment member is attached to the beam, and the string-like body is attached to the beam under the beam using the attachment member. Reinforcement of floor slab characterized in that when a force for pushing up the floor slab is applied, a tensile force acts on the string-like body, and a tensile force acts on the upper surface side of the floor slab via the beam. apparatus. The floor slab reinforcing device according to claim 1, wherein the jack is mounted on the string-like body . Floor slab reinforcement device according to claim 1, wherein the addition of pre-stress to the string-like body. The floor slab reinforcing device according to claim 1 or 2, wherein the jack is a rotary type having a male screw. The floor slab reinforcing device according to any one of claims 1 to 4 , wherein the floor slab is an existing structure. The floor slab reinforcement device according to any one of claims 1 to 5 , wherein the load is a load caused by vibration.

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