Jack-up method

Abstract

To precisely set loads that beams of respective layers of a structure bear, based upon the pressure reception area of a temporary bearing jack.SOLUTION: The present invention relates to a jack-up method for temporarily jacking up a predetermined layer where a jack-up object part of a structure is located, and the jack-up method includes a first jack installation step of installing a first jack at the jack-up object part of the predetermined layer, a second jack installation step of installing a second jack above a jack-up object part of the upper layer above the predetermined layer or below a jack-up object part of the lower layer below the predetermined layer, and a synchronous push-up step of pushing up an upper part of the predetermined layer with the first jack and also pushing up an upper part of the upper layer or an upper part of the lower layer with the second jack so that the pushing-up force of the first jack and the pushing-up force of the second jack are synchronized, wherein the first jack and the second jack are fluid operation type jacks in communication with piping for supplying liquid to the respective jacks.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a jack-up method. [Background technology]

[0002] For example, in a construction work for replacing a seismic isolation device installed in a seismic isolation layer of a structure, a construction method is sometimes adopted in which structural materials located above and below the seismic isolation layer are supported by temporary support jacks. Specifically, in this construction method, temporary support jacks are placed across beams located above and below the seismic isolation layer, so that the load on the seismic isolation device can be transferred to the temporary support jacks. However, in the case of this construction method, the load of the structure above the seismic isolation layer is concentrated on the beam across which the temporary support jacks are placed, and the beam may not be strong enough. For this reason, a method is sometimes used in which the beam across which the temporary support jacks are placed and the column connected to the beam are reinforced or reinforced with brackets to reinforce the structure so that the load on the structure can be supported.

[0003] However, even if the above-mentioned methods for reinforcing structures are used, the following problems still remain: (1) The load on the beams that support the temporary support jacks may be too large to begin with, and the load may not be able to be handled by reinforcing the structure alone. Also, (2) when reinforcing the beams and columns of an existing structure, the reinforcement work becomes large-scale, and the work area increases, which may increase the construction period and costs. Furthermore, (3) the reinforced area after the reinforcement work is completed may narrow the area available to users of the structure.

[0004] Therefore, in the layers above (upper layer) and below (lower layer) the seismic isolation layer, temporary support jacks are placed in succession at the same positions on the plane as the temporary support jacks. This allows the load on the beams that connect the temporary support jacks on the seismic isolation layer to be transferred to the beams that connect the temporary support jacks on the upper and lower layers. This allows the load on the seismic isolation device to be distributed and transferred by the temporary support jacks on each layer (seismic isolation layer, upper layer, and lower layer). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6770328 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the temporary support jacks of the seismic isolation layer are applied, the structure may deform indefinitely depending on the rigidity of the structure, and the load on the temporary support jacks of the upper and lower layers may vary. For this reason, it has been difficult to precisely distribute an arbitrary load to beams of a given layer of the structure based on the pressure-receiving area of ​​the temporary support jacks of the seismic isolation layer and the pressure-receiving area of ​​the temporary support jacks of the upper and lower layers.

[0007] An object of the present invention is to provide a jacking-up method that can accurately set the load borne by the beams of each floor of a structure based on the pressure-receiving area of ​​the temporary-support jack. [Means for solving the problem]

[0008] Some embodiments of the present invention are a jacking-up method for temporarily jacking up a specified floor on which a part of a structure to be jacked up is located, the method comprising: a first jack installation step of installing a first jack on the part to be jacked up on the specified floor; a second jack installation step of installing a second jack above the part to be jacked up on an upper floor of the specified floor and / or below the part to be jacked up on a floor below the specified floor; and a synchronous push-up step of pushing up an upper part of the specified floor with the first jack and pushing up an upper part of the upper floor or at least one of an upper part of the lower floor with the second jack so that the pushing force of the first jack and the pushing force of the second jack are synchronized, wherein each of the first jack and the second jack is a fluid-operated jack connected to a piping that supplies a fluid to each of the jacks.

[0009] Other features of the present invention will become apparent from the following specification and drawings. Effect of the Invention

[0010] According to some embodiments of the present invention, the load borne by the beams of each floor of a structure can be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an explanatory diagram of a temporary support structure 10 of the present embodiment. [Diagram 2] FIG. 2 is an explanatory diagram showing how a load is transmitted in a seismic isolation structure 90 in which a seismic isolation device 80 is installed. [Diagram 3] FIG. 3 is an explanatory diagram showing a state in which a load is transmitted in the temporary receiving structure 10A of the first comparative example. [Figure 4] FIG. 4 is an explanatory diagram showing a state in which a load is transmitted in the temporary support structure 10B of the second comparative example. [Diagram 5] FIG. 5 is a flow diagram of the jacking up method of the present embodiment. [Figure 6] FIG. 6 is an explanatory diagram showing how a load is transmitted in the temporary support structure 10 of this embodiment. [Figure 7] FIG. 7 is an explanatory diagram of a temporary support structure 10C which is another example of the present embodiment. [Figure 8] FIG. 8 is an explanatory diagram of a temporary receiving structure 10D of the first modified example. [Figure 9] FIG. 9 is an explanatory diagram of a temporary receiving structure 10E of the second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] At least the following points will become apparent from the following specification and drawings.

[0013] A jacking-up method for temporarily jacking up a specified floor on which a jack-up target portion of a structure is located, comprising: a first jack installation step of installing a first jack on the jack-up target portion on the specified floor; a second jack installation step of installing a second jack above the jack-up target portion on an upper floor of the specified floor and / or below the jack-up target portion on a lower floor of the specified floor; and a synchronous push-up step of pushing up an upper portion of the specified floor with the first jack and pushing up an upper portion of the upper floor or at least one of an upper portion of the lower floor with the second jack so that the pushing force of the first jack and the pushing force of the second jack are synchronized, wherein each of the first jack and the second jack is a fluid-operated jack connected to piping that supplies fluid to each of the jacks.

[0014] According to this jacking-up method, the load borne by the beams of each floor of the structure can be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0015] In such a jacking up method, it is preferable that each of the jacks is a hydraulic jack connected to hydraulic piping.

[0016] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0017] In such a jacking-up method, it is desirable that the specified layer is a seismic isolation layer in which a seismic isolation device is placed, the jacking-up target part is a column and beam located in the seismic isolation layer, and the method further includes a seismic isolation device removal step of removing the seismic isolation device after the synchronous push-up step.

[0018] As a result, even when removing the seismic isolation device, the load borne by the beams on each floor of the structure can be set with high precision based on the pressure-receiving area of ​​the temporary support jack.

[0019] In such a jacking-up method, it is desirable to set the load obtained by multiplying the first jack load applied to the first jack by the ratio of the differential pressure receiving area, obtained by subtracting the second jack pressure receiving area of ​​the second jack from the first jack pressure receiving area of ​​the first jack, to the first jack pressure receiving area as the specified layer upper burden load to be borne by the upper part of the specified layer.

[0020] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0021] In such a jacking up method, it is preferable that a second jack pressure receiving area of ​​the second jack is equal to or smaller than a first jack pressure receiving area of ​​the first jack.

[0022] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0023] In such a jacking-up method, it is desirable that the load borne by the upper part of the specified layer and the load borne by the upper part of the upper layer or the upper part of the lower layer be set based on the ratio of the first jack pressure-receiving area of ​​the first jack to the second jack pressure-receiving area of ​​the second jack.

[0024] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0025] In such a jacking-up method, it is desirable that the upper part of the upper layer is a joint corner between an upper part of a vertical structural member of the upper layer and a horizontal structural member of the upper layer.

[0026] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0027] In such a jacking up method, it is desirable that the second jack has a jack body and a temporary material installed between the jack body and the upper part of the upper layer or the upper part of the lower layer.

[0028] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0029] In such a jacking-up method, it is desirable that the temporary material has a vertical portion connected to the jack body, and a connection portion connecting the vertical portion to the upper part of the upper layer or the upper part of the lower layer.

[0030] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0031] In such a jacking-up method, it is desirable that the connection portion has a horizontal surface portion that horizontally expands the area that bears the vertical load acting on the vertical portion and reduces the surface pressure applied to the upper part of the upper layer or the upper part of the lower layer.

[0032] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0033] In such a jacking-up method, it is desirable that the connection portion has a vertical surface portion that is connected to the horizontal surface portion and increases the shear resistance in the vertical direction by frictional force due to tension.

[0034] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0035] In this jacking-up method, it is desirable that the connection portion is an inclined connection member.

[0036] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0037] In such a jacking-up method, it is desirable that the temporary material is a diagonal material, that the lower part of the jack body has an inclined base, and that the jack body is installed at the same inclination as the diagonal material.

[0038] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0039] In such a jacking-up method, it is desirable that the temporary material is a diagonal material and has a balancing diagonal material that is balanced with the diagonal material in a vertically symmetrical direction to the diagonal material.

[0040] This allows the load borne by the beams on each floor of the structure to be set with high accuracy based on the pressure-receiving area of ​​the temporary support jack.

[0041] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same or equivalent components, members, etc. shown in each drawing are designated by the same reference numerals, and duplicated descriptions will be omitted as appropriate.

[0042] ===This embodiment=== <Outline of Temporary Support Structure 10> FIG. 1 is an explanatory diagram of a temporary support structure 10 of the present embodiment.

[0043] The temporary support structure 10 is a structure in which a part of the structural material of a structure is temporarily supported by a jack etc. The temporary support structure 10 has a structure 70, a jack 6 and a jack 15.

[0044] The structure 70 has a temporary supporting layer lower beam 2, a temporary supporting layer upper beam 4, and a first upper layer beam 13, which are horizontal structural members, and a first upper layer column 14, which is a vertical structural member. A temporary supporting layer 1 is formed between the temporary supporting layer lower beam 2 and the temporary supporting layer upper beam 4. Furthermore, a first upper layer 11 is formed between the temporary supporting layer upper beam 4 and the first upper layer beam 13. A temporary supporting layer slab 3 is installed on the upper part of the temporary supporting layer lower beam 2, and a first upper layer slab 12 is installed on the upper part of the temporary supporting layer upper beam 4.

[0045] In the temporary support structure 10 of this embodiment, a temporary support target portion 5 is formed on a portion of the vertical structural material (here, a column) of the temporary support layer 1. In the temporary support structure 10 of this embodiment, the temporary support target portion 5 is a portion of the structure 70 where a seismic isolation device is to be installed (seismic isolation device installation portion). In the temporary support structure 10 of this embodiment, as shown in Fig. 1, the seismic isolation device is in a removed state, and the structural materials located at the upper and lower portions of the temporary support layer 1 are supported by jacks or the like (here, jack 6, which will be described later).

[0046] The temporary support layer 1 is a layer in which structural materials located at the upper and lower parts are temporarily supported by jacks 6. In the temporary support structure 10 of this embodiment, the temporary support layer 1 is a seismic isolation layer. That is, in the temporary support structure 10 of this embodiment, the temporary support layer 1 is a layer in which a seismic isolation device is installed. Therefore, in the following description, the "temporary support layer" may be called the "seismic isolation layer". However, the temporary support layer 1 is not limited to a seismic isolation layer (a layer in which a seismic isolation device is installed). In other words, the temporary support layer 1 may be a layer in which structural materials located at the upper and lower parts are temporarily supported by jacks when repairing a damaged column. In this case, the temporary support layer 1 is temporarily jacked up with a jack, the damaged column is repaired, and then the layer is jacked down. In addition, the temporary support layer 1 may be a layer in which a seismic isolation device is installed when a seismic isolation retrofit is applied to seismically isolate an existing structure. In this case, the temporary support layer 1 is temporarily jacked up with a jack, the columns located on the temporary support layer 1 are cut, the columns are reconstructed by installing seismic isolation devices on the cut columns, and then the columns are jacked down.

[0047] The first upper layer 11 is a layer located on the upper part of the temporary support layer 1. The first upper layer 11 is temporarily supported by a jack 15 described later. In the temporary support structure 10 of this embodiment, the layer located on the upper part of the temporary support layer 1 is only the first upper layer 11. However, a plurality of layers may be located on the upper part of the temporary support layer 1. In a temporary support structure 10C of another example of this embodiment shown in FIG. 7 described later, a second upper layer 21 is formed on the upper part of the temporary support layer 1 in addition to the first upper layer 11. In the following description, the layer located on the upper part of the temporary support layer 1, including the first upper layer 11, may be simply referred to as the "upper layer". In addition, the temporary support structure 10 of this embodiment may have a layer (lower layer) located below the temporary support layer 1.

[0048] The jack 6 is a device that temporarily supports the structural materials located at the upper and lower parts of the temporary support layer 1. In the following description, the jack 6 may be called a "temporary support layer jack" or a "seismic isolation layer jack." In the temporary support structure 10 of this embodiment, the jack 6 is a hydraulic jack, and oil is supplied from the hydraulic device 30 through the hydraulic piping 9, and the hydraulic force is used to push up the structural materials located at the upper part of the temporary support layer 1 (here, the upper beam 4 of the temporary support layer) and at the same time push down the structural materials located at the lower part of the temporary support layer 1 (here, the lower beam 2 of the temporary support layer). This makes it possible to temporarily support the structural materials located at the upper and lower parts of the temporary support layer 1 (here, the upper beam 4 of the temporary support layer and the lower beam 2 of the temporary support layer). However, the jack 6 may be a jack other than a hydraulic jack, such as an air-operated jack, or may be a liquid-operated jack other than a hydraulic jack or an air-operated jack. In other words, the jack 6 may be a fluid-operated jack.

[0049] In the following, when comparing the cases of pushing up (structural materials located at the top of the temporary support layer 1) and pushing down (structural materials located at the bottom of the temporary support layer 1), only the case of "pushing up" may be explained. In other words, in the following, the explanation of the "pushing up force" of the jack 6 can be similarly applied to the case of the "pushing down force" of the jack 6 pushing down the structural materials located at the bottom of the temporary support layer 1. Note that the explanation of only the case of "pushing up" also applies to the explanation of jack 15 described later.

[0050] The jacks 6 are installed at a jack-up target portion in the temporary support layer 1 of the temporary support target portion 5 (a portion where a seismic isolation device is to be installed). In the temporary support structure 10 of this embodiment, a pair of jacks 6 are installed on both sides of the temporary support target portion 5, as shown in FIG.

[0051] The jack 6 has a jack body 7 and a temporary material 8. The jack body 7 is a part to which oil is supplied from the hydraulic device 30 via hydraulic piping 9, and is equipped with a cylinder, etc. The temporary material 8 is a member installed between the jack body 7 and a structure 70 (here, the temporary support layer upper beam 4 located on top of the temporary support layer 1). In the temporary support structure 10 of this embodiment, the temporary material 8 is, for example, an H-beam, but may be a member other than an H-beam. The temporary material 8 transmits the force of the hydraulic pressure generated in the jack body 7 to the structure 70 (here, the temporary support layer upper beam 4).

[0052] The jack 15 is a device that temporarily supports the structural materials located at the upper and lower parts of the first upper layer 11. In the following description, the jack 15 may be referred to as the "first upper layer jack" or simply as the "upper layer jack." In the temporary support structure 10 of this embodiment, the jack 15 is a hydraulic jack, and oil is supplied from the hydraulic device 30 through the hydraulic piping 18, and the hydraulic force is used to push up the structural material located at the upper part of the first upper layer 11 (here, the first upper layer beam 13), and at the same time, push down the structural material located at the lower part of the first upper layer 11 (here, the temporary support layer upper beam 4). However, the jack 15 may be a jack other than a hydraulic jack, such as an air-operated jack, or may be a liquid-operated jack other than a hydraulic jack, or an air-operated jack. In other words, the jack 15 may be a fluid-operated jack.

[0053] The jack 15 is installed at the jack-up target portion in the first upper layer 11 of the first upper layer column 14. In the temporary support structure 10 of this embodiment, as shown in FIG. 1, a pair of jacks 15 are installed on both sides of the first upper layer column 14. In the temporary support structure 10 of this embodiment, the jacks 15 are installed in the first upper layer 11 in the same position on the plane as the jacks 6 of the temporary support layer 1, in a continuous layer. Note that the jacks 15 may be misaligned on the plane from the jacks 6 of the temporary support layer 1, as long as the temporary support layer upper beam 4 has a strength capable of resisting the bending moment generated at the position between the jacks 6 and 15. This allows the load applied to the beams (e.g., the temporary support layer upper beam 4) that span the jacks 6 of the temporary support layer 1 to be transmitted to the beams (e.g., the first upper layer beam 13) that span the jacks 15 of the first upper layer 11.

[0054] The jack 15 has a jack body 16 and a temporary material 17. The jack body 16 is a part to which oil is supplied from the hydraulic device 30 via hydraulic piping 18, and is equipped with a cylinder, etc. The temporary material 17 is a member installed between the jack body 16 and a structure 70 (here, the first upper layer beam 13 located at the top of the first upper layer 11). In the temporary support structure 10 of this embodiment, the temporary material 17 is, for example, an H-beam, but may be a member other than an H-beam. The temporary material 17 transmits the force of the hydraulic pressure generated in the jack body 16 to the structure 70 (here, the first upper layer beam 13).

[0055] The jacks 6 and 15 are connected by piping that supplies fluid to each jack. In the temporary support structure 10 of this embodiment, the jacks 6 and 15 are hydraulic jacks with hydraulic piping that communicates with each other. That is, as shown in FIG. 1, the hydraulic piping 9 that supplies oil to the jack 6 and the hydraulic piping 18 that supplies oil to the jack 15 are connected by a communication piping 31. This allows the jack 6 to push up the upper part of the temporary support layer 1 and the jack 15 to push up the upper part of the first upper layer 11 so that the pushing-up force of the jack 6 and the pushing-up force of the jack 15 are synchronized.

[0056] <Comparative Example> ·Seismic isolation structure 90 In the following, the details of the temporary support structure 10 of this embodiment will be described in comparison with a temporary support structure of a comparative example. First, before describing the temporary support structure of the comparative example, a state before jacking up with the jacks 6 and 15, that is, a seismic isolation structure 90 with a seismic isolation device 80 installed will be described.

[0057] FIG. 2 is an explanatory diagram showing how a load is transmitted in a seismic isolation structure 90 in which a seismic isolation device 80 is installed.

[0058] The seismic isolation structure 90 is a structure in which a seismic isolation device 80 is installed in a part of a structural material of a structure 70. The seismic isolation structure 90 has the seismic isolation device 80 in a part of a vertical structural material (here, a column) of the structure 70, as shown in FIG.

[0059] The seismic isolation device 80 is a device that supports the structure above the seismic isolation device 80 so that it can move relatively in the horizontal direction. The seismic isolation device 80 is installed (mounted) on a part of a column located on the temporary support layer 1. The seismic isolation device 80 may be a laminated rubber, or may be a sliding bearing or a rolling bearing.

[0060] In Fig. 2, arrows show an example of the flow of load acting on the structural materials of structure 70 in seismic isolation structure 90. In the following description, the load acting on the structural materials of structure 70 may be referred to as the "burden load." In other words, the flow of load shown in Fig. 2 is the flow of the borne load. In seismic isolation structure 90, the borne load is transmitted from the horizontal structural materials (temporary support layer upper beams 4 and first upper layer beams 13) through the vertical structural materials (first upper layer columns 14 and the upper columns of seismic isolation device 80) and then through seismic isolation device 80.

[0061] First Comparative Example FIG. 3 is an explanatory diagram showing a state in which a load is transmitted in the temporary receiving structure 10A of the first comparative example.

[0062] In the construction work for replacing the seismic isolation device 80 installed in the temporary support layer 1 of the seismic isolation structure 90 described above, it is necessary to remove the seismic isolation device 80. Therefore, the load transmitted to the seismic isolation device 80 described above is temporarily supported by another device, so that the seismic isolation device 80 can be removed. In the temporary support structure 10A of the first comparative example, a jack 6 is installed in the temporary support layer 1 to temporarily support (temporarily support) the load applied to the structural materials located at the upper and lower parts of the temporary support layer 1. However, unlike the temporary support structure 10 of this embodiment, the temporary support structure 10A of the first comparative example does not have a jack installed in the first upper layer 11. Therefore, the load is concentrated on the structural materials located at the upper and lower parts of the temporary support layer 1, and the structural materials may become insufficient in strength.

[0063] Therefore, in the temporary support structure 10A of the first comparative example, as shown in the shaded area in Fig. 3, the beams (the temporary support layer lower beams 2 and the temporary support layer upper beams 4) across which the jacks 6 are placed and the columns (the first upper layer columns 14) connected to the beams are reinforced with additional reinforcement or brackets. This makes it possible to prevent the structural material of the structure 70 from becoming insufficient in strength.

[0064] However, in the temporary support structure 10A of the first comparative example, the load on the beams that span the jacks 6 is too large to begin with, and it may not be possible to handle it by simply reinforcing the structural materials of the structure 70. Also, if the structure 70 is an existing structure, the reinforcement work for the structural materials may be large-scale, and the work area may increase, which may increase the construction period and costs. Furthermore, the area available to users of the structure 70 may be narrowed due to the reinforced parts after the reinforcement work is completed.

[0065] Second Comparative Example FIG. 4 is an explanatory diagram showing a state in which a load is transmitted in the temporary support structure 10B of the second comparative example.

[0066] In the temporary support structure 10B of the second comparative example, a jack 15 is installed in the first upper layer 11. The jack 15 is installed in the same position on the plane as the jack 6 of the temporary support layer 1 in the first upper layer 11, in a continuous manner, as in the temporary support structure 10 of the present embodiment. This allows the load applied to the beam (e.g., the temporary support layer upper beam 4) that spans the jack 6 of the temporary support layer 1 to be transmitted to the beam (e.g., the first upper layer beam 13) that spans the jack 15 of the first upper layer 11. Therefore, in the temporary support structure 10B of the second comparative example, the load applied to the temporary support layer upper beam 4 located at the top of the temporary support layer 1 can also be distributed to the first upper layer beam 13.

[0067] However, in the temporary support structure 10B of the second comparative example, unlike the temporary support structure 10 of this embodiment, the jack 6 installed on the temporary support layer 1 and the jack 15 installed on the first upper layer 11 are not connected by hydraulic piping. Specifically, the hydraulic piping 9 through which oil is supplied to the jack 6 is not connected to the hydraulic piping 18 through which oil is supplied to the jack 15. In the temporary support structure 10B of the second comparative example, as shown in Fig. 4, the jack 6 is supplied with oil from a hydraulic device 301 via the hydraulic piping 9, and the jack 15 is supplied with oil from another hydraulic device 302 via the hydraulic piping 18.

[0068] In the temporary support structure 10B of the second comparative example, the procedure for operating the jacks 6 and 15 (jacking up) is, for example, as follows. That is, first, the jack 15 of the first upper layer 11 is operated to push up the first upper layer beam 13 (pressurizing the jack 15). At this time, the jack 15 can be considered as a structural model that is simply a support member that connects the temporary support layer upper beam 4 and the first upper layer beam 13. Next, the jack 6 of the temporary support layer 1 is operated to push up the temporary support layer upper beam 4. At this time, the distribution of the load depends on the rigidity of each structurally related member. The load borne by the temporary support layer upper beam 4 varies depending on the rigidity of the temporary support layer upper beam 4 and the first upper layer beam 13, the first upper layer column 14, and the temporary material 17.

[0069] In the temporary support structure 10B of the second comparative example, in order to distribute an arbitrary load to the beams of a specified layer, the rigidity of the structural materials of the structure 70 must be taken into consideration, and the load to be borne by the temporary support layer upper beam 4 and the first upper layer beam 13 must be determined through complex structural analysis.

[0070] In contrast to the temporary support structure 10B of the second comparative example, in the temporary support structure 10 of this embodiment, the jack 6 and the jack 15 are hydraulic jacks with hydraulic piping communicating with each other, so that the pushing-up force of the jack 6 and the pushing-up force of the jack 15 are synchronized, the jack 6 can push up the upper part of the temporary support layer 1, and the jack 15 can push up the upper part of the first upper layer 11. At this time, the jack 15 can be considered as a structural model that is regarded as a force application point on the temporary support layer upper beam 4 and the first upper layer beam 13, and the load applied to the temporary support layer upper beam 4 and the first upper layer beam 13 is always the same proportion according to the load related to the jack (hereinafter, sometimes referred to as the "jack load"). In other words, unlike the temporary support structure 10B of the second comparative example, in the temporary support structure 10 of this embodiment, the distribution of the load applied to the structural material can be calculated only by the exchange of the jack load, regardless of the rigidity and deflection of the structural member.

[0071] Incidentally, when jacks 6 and jacks 15 are hydraulic jacks, and in a configuration in which oil is supplied from the same hydraulic device 30 in communication with each other, the hydraulic pressure of each hydraulic jack is constant. As a result, the load that each hydraulic jack imparts to structure 70 is kept constant regardless of the amount of expansion or contraction of the hydraulic jack due to an external force from structure 70. In addition, when the hydraulic pressure in each hydraulic jack is constant, the ratio of the loads that each hydraulic jack imparts to structure 70 is characterized by being proportional to the pressure-receiving area of ​​each hydraulic jack.

[0072] For this reason, in the temporary support structure 10 of this embodiment, by adjusting the ratio of the pressure-receiving area of ​​the jacks 15 of the first upper layer 11 to the pressure-receiving area of ​​the jacks 6 installed on the temporary support layer 1, it is possible to distribute any load with high precision to the beams of a given layer without considering the rigidity of the structural materials of the structure 70. In other words, the proportion of the load borne by the beams of a given layer of the structure 70 can be set with high precision and easily based on the pressure-receiving area of ​​the jacks 6 and the pressure-receiving area of ​​the jacks 15.

[0073] <How to jack up> Fig. 5 is a flow diagram of the jacking up method of the present embodiment. Fig. 6 is an explanatory diagram showing how a load is transmitted in the temporary support structure 10 of the present embodiment.

[0074] The jacking up method of this embodiment is a jacking up method (specifically, a seismic isolation device removal method) for removing the seismic isolation device 80 provided in the seismic isolation layer (here, the temporary support layer 1) shown in Fig. 2 described above. In the jacking up method of this embodiment, first, a seismic isolation layer jack (here, jack 6) is installed at the jacking up target portion in the seismic isolation layer of the seismic isolation device 80 (seismic isolation layer jack installation step: S001 in Fig. 5). At this point, the jack 6 has not yet been operated.

[0075] Next, an upper layer jack (here, jack 15) is installed above the above-mentioned jack-up target portion in the upper layer (here, first upper layer 11) of the seismic isolation layer (upper layer jack installation step: S002 in FIG. 5). At this point, the jack 15 has not yet been operated.

[0076] Next, the seismic isolation layer jack (jack 6) pushes up the upper part of the seismic isolation layer, and the upper layer jack pushes up the upper part of the upper layer, so that the pushing-up force of the seismic isolation layer jack and the pushing-up force of the upper layer jack (jack 15) are synchronized (synchronized pushing-up step: S003 in FIG. 5). In this embodiment, the seismic isolation layer jack and the upper layer jack are hydraulic jacks with hydraulic piping communicating therebetween, so that such a synchronized pushing-up step can be easily performed.

[0077] Finally, the seismic isolation device 80 is removed (seismic isolation device removal step: S004 in FIG. 5). In the jacking-up method of this embodiment, the ratio of the load borne by the beams of a predetermined layer of the structure 70 can be set accurately and easily based on the pressure-receiving areas of the temporary support jacks (seismic isolation layer jack and upper layer jack). The seismic isolation layer jack pressure-receiving area of ​​the seismic isolation layer jack and the upper layer jack pressure-receiving area of ​​the upper layer jack may be the same, or the upper layer jack pressure-receiving area of ​​the upper layer jack may be equal to or smaller than the seismic isolation layer jack pressure-receiving area of ​​the seismic isolation layer jack. The load borne by the upper beams of the seismic isolation layer and the load borne by the upper beams of the upper layer or the upper beams of the lower layer are automatically set depending on the ratio of the seismic isolation layer jack pressure-receiving area of ​​the seismic isolation layer jack to the upper layer jack pressure-receiving area of ​​the upper layer jack.

[0078] In the temporary support structure 10 shown in Fig. 6, for example, it is planned that a jack 15 with 40% of the pressure-receiving area of ​​the jack 6 is installed on the first upper layer 11 with the jack 6 on the temporary support layer 1 as a reference, and the load of the structure 70 is shared by two layers of beams (the temporary support layer upper beams 4 and the first upper layer beams 13). In this case, if the hydraulic pipe 9 through which oil is supplied to the jack 6 and the hydraulic pipe 18 through which oil is supplied to the jack 15 are connected by the communication pipe 31, the jack load of each jack is determined by the ratio of the pressure-receiving area of ​​the jack 6 to the pressure-receiving area of ​​the jack 15. In this case, the first upper layer beam 13 of the jack 15 bears 40% of the jack load of the jack 6. The remaining load flows entirely to the columns and then through the upper beam 4 of the temporary support layer directly above the jack 6 to the jack 6, so the upper beam 4 of the temporary support layer inevitably bears 60% of the total load borne by the jack 6. In this way, the load borne by each jack can be adjusted by the ratio of the pressure-receiving areas of the jacks installed on each floor, and the load borne by the beams can be distributed.

[0079] <Calculation method for distributing load> FIG. 7 is an explanatory diagram of a temporary support structure 10C which is another example of the present embodiment.

[0080] In the following, a calculation formula for distributing the load will be described using a temporary support structure 10C, which is another example of this embodiment shown in Fig. 7. In the temporary support structure 10C, in addition to the first upper layer 11, a second upper layer 21 is formed on the upper part of the temporary support layer 1.

[0081] As shown in FIG. 7, the pressure-receiving area of ​​the jack 6 installed on the temporary support layer 1 is A. The pressure-receiving area of ​​the jack 15 installed on the first upper layer 11 is A1. The pressure-receiving area of ​​the jack 25 installed on the second upper layer 21 is A2. As shown in FIG. 7, the load applied to the upper beam 4 of the temporary support layer is P n The load applied to the first upper beam 13 is designated as P1, and the load applied to the second upper beam 23 is designated as P2.

[0082] Here, the following formula is established. In the following formula, N is the load applied to the jack 6 installed on the temporary support layer 1, and n is the number of jack stages in the calculation formula (i.e., the number of beam stages). Furthermore, Pn is the load applied to the beam on which the jack is installed (the load borne by the beam), and An is the pressure-receiving area of ​​the jack. A is the pressure-receiving area of ​​the jack installed on the temporary support layer 1. Here, Pn and An each indicate the amount of a single jack, but rather the total amount of multiple jacks installed on each layer.

[0083]

number

[0084]

number

[0085]

number

[0086]

number

[0087] ·Calculation example 1 An example of calculation in which n=3 and the load carried by each beam is the same is shown below.

[0088] Since the load carried by each beam is the same, the relationship between P1 to P3 is as follows. P1 = P2 = P3 (1) Here, for simplicity, let P denote each of the loads P1 to P3 borne by each beam.

[0089] Then, from the above-mentioned formula 1, the jack load N of the jack 6 on the temporary support layer 1 is calculated as follows. N = P1 + P2 + P3 = 3P (2) Solving (2) for P gives us the following: P = N / 3 (3)

[0090] Substituting (3) into the above formula 2, we get the following: A1 / A=1 / 3 (4) Furthermore, substituting (3) into the above formula 3 gives the following: A2 / A=P / N+A1 / A =1 / 3+1 / 3 =2 / 3 (5)

[0091] Therefore, by selecting jacks so that the topmost jack 15 has a pressure-receiving area that is 1 / 3 of that of the jack 6 on the temporary support layer 1, and the second jack 25 has a pressure-receiving area that is 2 / 3 of that of the jack 6 on the temporary support layer 1, the same load will be applied to each beam. In this way, the proportion of the load borne by the beams on a specified layer of the structure 70 can be easily set based on the pressure-receiving area of ​​the temporary support jacks.

[0092] ·Calculation example 2 An example of calculation is shown below when n=3 and jacks A1=A×40% and A2=A×70% are selected.

[0093] Substituting each jack load into Equation 2 and Equation 3, we get the following. P1=A1 / A×N =0.4N (6) P2 = (A2 - A1) / A × N =(0.7A-0.4A) / A×N =0.3N (7) P3 = (A3 - A2) / A × N =(A-0.7A) / A×N =0.3N (8)

[0094] Therefore, the jack load N of the seismic isolation layer is distributed to each beam in a ratio of P1:P2:P3 = 4:3:3. In this way, the ratio of the load borne by the beams of a given layer of the structure 70 can be easily set based on the pressure-receiving area of ​​the temporary support jack.

[0095] <Modification> First modified example FIG. 8 is an explanatory diagram of a temporary receiving structure 10D of the first modified example.

[0096] In the temporary support structure 10D of the first modification, the temporary material 27 has a vertical part 29A connected to the jack body 26 and a connection part 29B connecting the vertical part 29A to the upper part of the second upper layer 21 (or the upper part of the lower layer). The connection part 29B has a horizontal surface part 29C that expands the area that bears the vertical load acting on the vertical part 29A in the horizontal direction and reduces the surface pressure applied to the upper part of the second upper layer 21 (or the upper part of the lower layer). The connection part 29B also has a vertical surface part 29D that connects to the horizontal surface part 29C and increases the shear force in the vertical direction by frictional force due to tension. The connection part 29B may be an inclined connection material. Even in this case, the proportion of the load that the beam of a specified layer of the structure 70 bears can be easily set based on the pressure-bearing area of ​​the temporary support jack.

[0097] Second variant FIG. 9 is an explanatory diagram of a temporary receiving structure 10E of the second modified example.

[0098] In the temporary support structure 10E of the second modification, the temporary material 27 is a diagonal material, and has an inclined base 29E at the bottom of the jack body 26, and the jack body 26 is installed at the same inclination as the diagonal material 27. The jack body 26 may further have a balancing diagonal material that balances with the diagonal material 27 in the vertical symmetrical direction of the temporary material 27. Even in this case, the proportion of the load borne by the beam of a predetermined layer of the structure 70 can be easily set based on the pressure-receiving area of ​​the temporary support jack.

[0099] ===Other=== The above-described embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0100] 1. Temporary Receptacle Layer 2. Temporary support layer lower beam 3. Temporary support layer slab 4. Temporary support layer upper beam 5. Temporary receiving area 6,15,25 Jack 7,16,26 Jack body 8,17,27 Temporary materials 9,18,28 Hydraulic piping 10 Temporary support structure 11 1st upper layer 12 First upper slab 13 1st upper beam 14 First Upper Pillar 21 2nd upper layer 22 Second upper slab 23 2nd upper layer beam 24 Second Upper Pillar 29A Vertical section 29B Connection 29C Horizontal part 29D Vertical surface 29E tilting base 30,301,302 Hydraulic system 31 Communication piping 70 Structures 80 Seismic isolation device 90 Earthquake-proof structure

Claims

1. A jacking-up method for temporarily jacking up a predetermined layer on which a jack-up target portion of a structure is located, comprising the steps of: A first jack installation step of installing a first jack on the jack-up target portion on the predetermined floor; a second jack installation step of installing a second jack above the jack-up target portion in the upper layer of the predetermined layer and / or below the jack-up target portion in the lower layer of the predetermined layer; A synchronized push-up step of pushing up an upper portion of the predetermined layer with the first jack and pushing up at least one of an upper portion of the upper layer and an upper portion of the lower layer with the second jack so that the pushing force of the first jack and the pushing force of the second jack are synchronized; having Each of the first jack and the second jack is a fluid-operated jack to which a pipe for supplying a fluid to each of the jacks is connected. How to jack up.

2. Each of the jacks is a hydraulic jack connected to a hydraulic pipe. The jacking up method according to claim 1.

3. The predetermined layer is a seismic isolation layer in which a seismic isolation device is installed, and the jack-up target portion is a column and beam located in the seismic isolation layer, a seismic isolation device removal step of removing the seismic isolation device after the synchronous push-up step; having The jacking up method according to claim 1.

4. A load obtained by multiplying a ratio of a differential pressure receiving area obtained by subtracting a second jack pressure receiving area of ​​the second jack from a first jack pressure receiving area of ​​the first jack to the first jack pressure receiving area by a first jack load applied to the first jack is set as a predetermined layer upper load to be borne by the upper portion of the predetermined layer. The jacking up method according to claim 1.

5. The second jack pressure receiving area of ​​the second jack is equal to or smaller than the first jack pressure receiving area of ​​the first jack, The jacking up method according to claim 1.

6. The load borne by the upper part of the predetermined layer and the load borne by the upper part of the upper layer or the upper part of the lower layer are set by the ratio of the first jack pressure receiving area of ​​the first jack to the second jack pressure receiving area of ​​the second jack. The jacking up method according to claim 1.

7. The upper part of the upper layer is a joint corner between the upper part of the vertical structural member of the upper layer and the horizontal structural member of the upper layer. The jacking up method according to claim 1.

8. The second jack has a jack body and a temporary material installed between the jack body and the upper part of the upper layer or the upper part of the lower layer. The jacking up method according to claim 1.

9. The temporary material has a vertical portion connected to the jack body and a connection portion connecting the vertical portion to the upper part of the upper layer or the upper part of the lower layer, The jacking up method according to claim 8.

10. The connection portion has a horizontal surface portion that expands an area that bears a vertical load acting on the vertical portion in a horizontal direction and reduces a surface pressure applied to an upper portion of the upper layer or an upper portion of the lower layer. The jacking up method according to claim 9.

11. The connection portion has a vertical surface portion connected to the horizontal surface portion and increasing the vertical shear resistance by frictional force due to tension. The jacking up method according to claim 10.

12. The connecting portion is a gradient connecting material. The jacking up method according to claim 9.

13. The temporary material is a diagonal material, The jack body has an inclined base at the bottom, and the jack body is installed at the same inclination as the diagonal member. The jacking up method according to claim 8.

14. The temporary material is a diagonal material, In a vertically symmetrical direction of the diagonal member, a balancing diagonal member is provided which is balanced with the diagonal member; The jacking up method according to claim 8.

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