Bracket for jack and methods of its attaching to and detaching from jack

Abstract

To provide a bracket for a jack, and methods of its attaching to and detaching from the jack, which allows easy handle operation without using a tool such as a hammer when operating the jack.SOLUTION: A bracket 10 is used for a jack 100 having a spindle 102 with a thread groove 101 engraved on its outer periphery, a pair of pedestals 103 consisting of a first pedestal 103A and a second pedestal 103B arranged on the spindle 102 and separated from each other in the axial direction of the spindle 102, and an operating handle 104 for rotating the spindle 102. It has a bracket body 11 that is removably attached to the jack 100 by being attached to the back surface of the first pedestal 103A, and the bracket body 11 is configured to be able to apply a pressing force that presses the first pedestal 103A from the front surface side of the second pedestal 103B toward the back surface side of the first pedestal 103A.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bracket for a jack, a method for attaching a jack, and a method for removing a jack, and more particularly to a bracket for a jack, a method for attaching a jack, and a method for removing a jack for attaching and removing a jack between a temporary support column supporting a formwork for concrete and a floor surface or the like.

Background Art

[0002] Conventionally, when placing concrete at a building construction site or an elevated road construction site, temporary square columns for supporting formworks are arranged at appropriate intervals, and a jack is arranged between the square column and the receiving base on the floor side, and the formwork is held by the square column and the jack (see, for example, Patent Document 1).

[0003] FIG. 6 shows an example of a generally known jack 100. The jack 100 includes a spindle 102 having a thread groove 101 engraved on its outer peripheral surface, and a first pedestal 103A and a second pedestal 103B that are separated in the axial direction of the spindle 102 and are respectively screwed into the thread groove 101 and attached to one end side (upper end side) of the spindle 102. A pair of pedestals 103, and an operation handle 104 that is attached to the spindle 102 between the first pedestal 103A and the second pedestal 103B and rotates the spindle 102 to axially feed the first pedestal 103A. Further, the first pedestal 103A has a base plate 105A that abuts and is connected to the base plate 110A on the side of the square column 110, and the second pedestal 103B has a base plate 105B that abuts against the receiving base 111 on the floor side.

[0004] The jack 100 configured as described above is placed by abutting the base plate 105B against a predetermined location of the receiving base 111 on the floor side, with the first pedestal 103A on the upper side and the second pedestal 103B on the lower side. Then, after placing the base plate 110A of the square column 110 in surface contact on the base plate 105A of the first pedestal 103A, the space between the base plate 105A and the base plate 110A is fixed with bolts and nuts 112, and the square column 110 is integrally arranged on the jack 100. The upper end of the square column 110 is brought into contact with the formwork 106 to support the formwork 106. Further, when the spindle 102 is rotated by the operation handle 104 of the jack 100 to screw-feed the first pedestal 103A of the jack 100 in the axial direction, the square column 110 is adjusted and supported at the vertical height position required to support the formwork 106.

[0005] And after the placement work of the concrete into the formwork 106 supported in this way is completed, when the formwork 106 is disassembled later, a large load acts between the formwork 106 and each square column 110. Therefore, when disassembling the formwork 106, first, the operation handle 104 of the jack 100 is rotated to retract (lower) the first pedestal 103A to release the load from the formwork 106. Then, each square column 110 is lowered, and the formwork 106 is disassembled while ensuring a large space between the formwork 106 and the square column 110.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] In the method of disassembling the formwork 106 supported by the temporary square column 110 and the jack 100 as described above, before disassembly, a large load acts on the jack 100 via the square column 110, and the threaded portion of the first pedestal 103A (not shown) and the threaded portion of the thread groove 101 in the spindle 102 are engaged with each other. Therefore, when operating the operation handle 104 for rotating the spindle 102 of the jack 100, the operation of the operation handle 104 is very difficult, and for example, an operation such as hitting with a hammer is performed to rotate the spindle 102 together with the operation handle 104. Therefore, when hitting the operation handle 104 with a hammer or the like, a loud metallic sound is generated. In this case, in the work in an area adjacent to a residence, it directly stimulates the senses of the residents and has various effects on the daily life of the residents and the workers engaged in the work. For example, a loud metallic sound not only reduces the quality of sleep, but also inhibits concentration and memory, and causes stress and irritation. There are also research results indicating that it can cause hearing loss and hearing impairment, and further increase the risk of lifestyle-related diseases such as heart disease and hypertension, which poses a problem of having a significant impact on the health of residents and workers. In addition, there was also a concern that strongly hitting with a hammer might damage the operation handle.

[0008] Therefore, when operating the jack, a technical problem to be solved arises in order to provide a jack bracket, a jack mounting method, and a jack removal method that can easily perform the handle operation without using tools such as a hammer. The present invention aims to solve this problem.

Means for Solving the Problem

[0009] The present invention is proposed to achieve the above object. The invention according to claim 1 is a jack for attaching or detaching a jack provided with a spindle having a thread groove engraved on its outer peripheral surface, a pair of pedestals including a first pedestal and a second pedestal separately arranged on the spindle in the axial direction of the spindle, and an operation handle for rotating the spindle to the lower end side of a square pillar. It is a bracket for a jack used when attaching or detaching, and has a bracket body detachably attached to the jack in contact with the back surface of the first pedestal. The bracket body is configured to be able to apply a pressing force for pressing the first pedestal by an auxiliary jack from the surface side of the second pedestal toward the back surface side of the first pedestal, and provides a bracket for a jack.

[0010] According to this configuration, for example, when attaching or detaching the jack, with the bracket body attached to the back surface of the first pedestal, an auxiliary jack prepared separately is attached to the lower surface of the bracket body, and a pressing force is applied to the bracket from the attached auxiliary jack toward the back surface side of the first pedestal. When the bracket and the jack are lifted together, the large load applied to the screw portion between the first pedestal and the spindle is reduced. As a result, the biting engagement between the screws between the first pedestal and the spindle is eliminated, and the spindle can be easily rotated using the operation handle, so that the work efficiency can be improved. In addition, when operating the operation handle conventionally, the operation of strongly hitting the operation handle with a hammer or the like can be eliminated, so that the noise during construction can be reduced and the breakage of the operation handle or the like can be prevented.

[0011] The invention according to claim 2 provides a bracket for a jack, in the configuration according to claim 1, wherein the bracket body is composed of a first bracket half body and a second bracket half body that can be butt-joined and have recesses for accommodating the spindle and allowing the spindle to escape on surfaces facing each other, and the first bracket half body and the second bracket half body are integrally formed so as to be decomposable from each other.

[0012] According to this configuration, when the first bracket half and the second bracket half, which are decomposed into two parts from each other, are faced and joined together with the spindle accommodated in the recess and released into the recess, the bracket can be easily and removably attached to the jack with the bracket attached to the back surface of the first pedestal.

[0013] The invention according to claim 3 is a jack removal method for attaching a jack including a spindle having a thread groove engraved on an outer peripheral surface, a pair of pedestals including a first pedestal and a second pedestal respectively separated in the axial direction of the spindle and arranged on the spindle, and an operation handle for rotating the spindle to the lower end side of a square column, the method including: after arranging a bracket on the back surface of the first pedestal, applying a pressing force from the side facing the surface of the second pedestal toward the back surface side of the first pedestal to the bracket by an auxiliary jack, and operating the operation handle with the load on the second pedestal removed.

[0014] According to this method, for example, when removing the jack, with the bracket body attached to the back surface of the first pedestal of the jack, an auxiliary jack prepared separately is arranged on the lower surface of the bracket body, and a pressing force is applied from the auxiliary jack to the back surface side of the first pedestal through the bracket, and when the bracket and the jack are lifted together, the large load applied to the meshing threads between the first pedestal and the spindle can be reduced. Then, due to the reduction of the load, the biting engagement between the threads between the first pedestal and the spindle is eliminated, and the spindle can be easily rotated using the operation handle, so that the work efficiency can be improved. In addition, when operating the operation handle conventionally, the operation of strongly hitting the operation handle with a hammer or the like can be eliminated, so that the noise in the construction can be reduced and the breakage of the operation handle or the like can be prevented.

[0015] The invention according to claim 4 is a jack mounting method for mounting a jack including a spindle having a thread groove formed on an outer peripheral surface, a pair of pedestals including a first pedestal and a second pedestal separately arranged on the spindle in the axial direction of the spindle, and an operation handle for rotating the spindle, on the lower end side of a square column. After arranging a bracket along the back surface of the first pedestal, an auxiliary jack is used to apply a pressing force from the side facing the surface of the second pedestal toward the back surface side of the first pedestal to lift the second pedestal, and then the operation handle is operated to lower the second pedestal to a predetermined position.

[0016] According to this method, for example, when mounting a jack, with the bracket body attached to the back surface of the first pedestal of the jack, an auxiliary jack prepared separately is arranged on the lower surface of the bracket body, and a pressing force is applied from the auxiliary jack to the back surface side of the first pedestal through the bracket to lift the bracket and the jack together to a predetermined position. As a result, the second pedestal is lifted away from the receiving base on the floor side, and a large load applied between the meshing threads between the first pedestal and the spindle can be reduced. Then, due to the reduction of the load, the biting and meshing of the threads between the first pedestal and the spindle are eliminated, and the spindle can be easily rotated using the operation handle. Thereby, the work efficiency can be improved. Also, conventionally, when operating the operation handle, the operation of strongly hitting the operation handle with a hammer or the like can be eliminated, so that the noise during construction can be reduced and damage to the operation handle or the like can be prevented.

Effect of the Invention

[0017] According to the present invention, for example, when attaching or detaching a jack, with the bracket body placed against one surface of the first pedestal, an auxiliary jack prepared separately is placed against the lower surface of the bracket body, that is, the surface side facing the second pedestal. A force is applied from the attached auxiliary jack toward the back surface side of the first pedestal to the bracket, and the bracket is pressed against the first pedestal side to lift the bracket and the jack together. As a result, a large load applied to the threaded portion between the first pedestal and the spindle can be reduced, so that the spindle can be easily rotated using the operation handle. By rotating the spindle, the distance between the first pedestal and the second pedestal can be easily adjusted, and the attachment and detachment of the jack can be easily performed. Further, since the spindle can be easily rotated using the operation handle, when operating the operation handle conventionally, the operation of strongly hitting the operation handle with a hammer or the like can be eliminated. Thereby, the noise during construction can be reduced, and damage to the operation handle or the like can be prevented.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0019] The present invention aims to provide a bracket for removing a jack, a method for attaching a jack, and a method for removing a jack that enable easy handle operation without using tools such as a hammer when operating the jack. To achieve this purpose, a spindle having a thread groove engraved on its outer peripheral surface, a pair of pedestals including a first pedestal and a second pedestal separately arranged on the spindle in the axial direction of the spindle, and an operation handle for rotating the spindle. A bracket for use in a jack, having a bracket body detachably attached to the jack by attaching it to the back surface of the first pedestal, and the bracket body is configured to be able to apply a pressing force for pressing the first pedestal from the surface side of the second pedestal toward the back surface side of the first pedestal.

Example

[0020] Hereinafter, an example according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following examples, when referring to the number of components, numerical values, amounts, ranges, etc., unless otherwise specified or limited to a specific number in principle, it is not limited to that specific number, and it may be more or less than the specific number.

[0021] Also, when referring to the shape, positional relationship, etc. of components, etc., unless otherwise specified or considered not to be so in principle, it includes those substantially approximate or similar to the shape, etc.

[0022] In addition, the drawings may be exaggerated, such as enlarging characteristic parts for easy understanding of the characteristics, and the dimensional ratios of components are not necessarily the same as the actual ones. Also, in cross-sectional views, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

[0023] In the following description, expressions indicating directions such as up and down, left and right, etc. are not absolute. They are appropriate when each part of the bracket of the present invention is in the depicted posture. However, when the posture changes, they should be interpreted as being changed according to the change in posture. Also, the same reference numerals are assigned to the same elements throughout the description of the embodiments.

[0024] FIG. 1 is an overall configuration diagram of a jack attachment / detachment system (hereinafter simply referred to as the "system") shown as an embodiment of the present invention. The system shown in FIG. 1 includes a square column 110 that supports the formwork 106, a jack 100 disposed between the square column 110 and the floor-side pedestal 111, a bracket 10 that is detachably attached to the jack 100, a pair of auxiliary jacks 50 attached to the jack 100 via the bracket 10, and the like. Note that the structure supported by this system is not limited to only the formwork 106. Further, FIG. 2 is a perspective view of the main part of the system shown in FIG. 1, where (A) is a perspective view of the process of attaching the bracket 10 to the jack 100, and (B) is a perspective view showing the state after the bracket is attached to the jack 100. Furthermore, FIG. 3 is a view showing the structure of the bracket used in the same system, where (A) is an exploded perspective view and (B) is a plan view of the bracket shown in (A).

[0025] Note that the jack 100, square column 110, and formwork 106 shown in FIGS. 1 and 2 are equivalent to the conventional products described in FIG. 6. Therefore, the same reference numerals are assigned to the same components as in FIG. 6, and redundant descriptions are omitted. Also, in the following description, the jack 100 is taken as an example of the case where it is attached to the lower end side of the square column 110 and the formwork 106 is attached to the upper end side of the square column 110. In this embodiment, between the lower end of the square column 110 and the first pedestal 103A of the jack 100, the base plate 110A of the square column 110 is placed on the base plate 105A of the first pedestal 103A and butted together. With the square column 110 stacked and joined on the first pedestal 103A, the base plate 105A and the base plate 110A are detachably joined and fixed with bolts and nuts 112.

[0026] When attaching or detaching the jack 100 to / from the lower end side of the square column 110, the bracket 10 is arranged with its upper surface in contact with the back surface of the first pedestal 103A at the upper part of the jack 100, that is, the lower surface of the base plate 105A. The bracket 10 has a bracket body 11. The bracket body 11 is formed of steel material and is divided into two parts, a first bracket half body 11A and a second bracket half body 11B. The first bracket half body 11A and the second bracket half body 11B are parts with the same shape and structure. When in use, they are fixed with a fixing member 12 which is a bolt and nut in a state where the butting surfaces 17 face each other, so that in a plan view, they can be integrated into a bracket 10 with a schematic cross shape. Therefore, in the following description, the corresponding parts of the first bracket half body 11A and the second bracket half body 11B are given the same reference numerals and repeated descriptions are omitted.

[0027] The first bracket half body 11A and the second bracket half body 11B are provided with a horizontal wall portion 14A and a horizontal wall portion 14B at the upper and lower ends of the vertical wall portion 13 respectively, and are configured in a substantially "E" - shaped cross - section. Also, the first bracket half body 11A and the second bracket half body 11B integrally have a left - and - right arm portion 15 extending in the left - and - right direction and a protruding portion 16 protruding outward from a substantially central portion in the left - and - right direction of the left - and - right arm portion 15.

[0028] Also, on the surfaces of the first bracket half body 11A and the second bracket half body 11B that face each other, that is, on the butting surfaces 17 of the horizontal wall portions 14, when the first bracket half body 11A and the second bracket half body 11B are butted against each other, recesses 18 and 19 are provided to accommodate the outer diameter portion of the spindle 102 of the jack 100 and allow the spindle 102 to escape from between the first bracket half body 11A and the second bracket half body 11B respectively.

[0029] In addition, on the lower horizontal wall portion 14B of the first bracket half 11A and the second bracket half 11B, flat plate-shaped horizontal protruding pieces 20 are respectively provided. When the butting surfaces 17 of the first bracket half 11A and the second bracket half 11B are butted and joined together, the horizontal protruding pieces 20 are respectively attached to the lower surface of the lower horizontal wall portion 14B, and are for positioning the first bracket half 11A and the second bracket half 11B in the vertical direction, and also serve as the pressurizing surface of the hydraulic jack 50A.

[0030] On the other hand, hook portions 21 are provided on the upper horizontal wall portion 14A of the first bracket half 11A and the second bracket half 11B. As shown in FIGS. 1 and 2, when the first bracket half 11A and the second bracket half 11B are attached to the lower surface of the base plate 105A of the first pedestal 103A of the jack 100, that is, the back surface of the first pedestal 103A, the hook portions 21 commonly insert the corner portions of the base plate 105A of the jack 100 and the corner portions of the base plate 110A on the square column 110 side that are overlapped with each other between the hook portions 21 and the upper horizontal wall portion 14A, and are for temporarily fixing and engaging the first bracket half 11A and the second bracket half 11B with the jack 100 and the square column 110, and are also used as handles when carrying the first bracket half 11A and the second bracket half 11B respectively.

[0031] Further, on each vertical wall portion 13 of the first bracket half 11A and the second bracket half 11B, when the butting surfaces 17 of the first bracket half 11A and the butting surfaces 17 of the second bracket half 11B are butted and joined together, a plurality of mounting holes 22 are provided at positions facing each other. These mounting holes 22 temporarily engage the respective hook portions 21 of the first bracket half 11A and the second bracket half 11B with the first pedestal 103A and the square pillar 110, respectively. In a state where the butting surface 17 of the first bracket half 11A and the butting surface 17 of the second bracket half 11B are butted against each other, a bolt 23 is inserted from one surface side of the second bracket half 11B and inserted to the other surface side of the first bracket half 11A. When a nut 24 is screwed onto the tip side of the bolt 23 and the space between the bolt 23 and the nut 24 is tightened, the first bracket half 11A and the second bracket half 11B can be releasably fixed. Thereby, the bracket 10 can be attached to the back surface of the first pedestal 103A, that is, one surface (lower surface) of the base plate 105A, and the bracket 10 can be attached to the jack 100 side.

[0032] The auxiliary jack 50 is a hydraulic jack (hereinafter, the auxiliary jack 50 will be described by rephrasing it as "hydraulic jack 50A") in this embodiment. The hydraulic jack 50A is connected to a manual hydraulic pump 51. When the operation lever 51A of the manual hydraulic pump 51 is reciprocally rotated up and down, oil (hydraulic oil) is fed into the hydraulic jack 50A. By adjusting the amount of hydraulic oil fed into the hydraulic jack 50A, the ram 51a can be raised to a predetermined limit position, and at the same time as the ram 51a rises, a heavy object (the bracket 10 in this embodiment) can be pushed up. Also, when the oil in the hydraulic jack 50A is drained, the ram 51a can be lowered to a predetermined limit position to release the pushing up of the heavy object. Note that an attachment 52 is attached to the upper surface of the ram 51a when the bracket 10 cannot be raised to a predetermined position even when the ram 51a is raised to a predetermined upper limit position, and the bracket 10 is pushed up to a predetermined position via the attachment 52. In this embodiment, it is shown in a state where the attachment 52 is arranged on the upper surface of the ram 51a. Therefore, it may also be used in a state where the attachment 52 is not attached to the ram 51a. Also, the hydraulic jack 50A and the manual hydraulic pump 51 are well-known. The hydraulic jack 50A is, for example, model E23S15 manufactured by Osaka Jack Mfg. Co., Ltd., and the manual hydraulic pump 51 is also model TWA-0.7 manufactured by Osaka Jack Mfg. Co., Ltd.

[0033] Therefore, in this embodiment, when temporarily installing the formwork 106 using the temporary square support column 110 and the jack 100, as shown in FIG. 1, a pair of hydraulic jacks 50A are prepared. One of the pair of hydraulic jacks 50A is arranged below the left end of the left and right arm portions 15 and below the bracket 10, and the other hydraulic jack 50A is arranged below the right end of the left and right arm portions 15 and below the bracket 10. Also, in this state, when hydraulic pressure is applied to the left and right hydraulic jacks 50A respectively to raise the ram 51a, the ram 51a abuts against the lower surface of the bracket 10, and the bracket 10 is raised together with the jack 100 and the square support column 110, and the formwork 106 can be temporarily installed at a predetermined position. In addition, when the protruding amount of the ram 51a cannot be obtained as a desired amount, it may be adjusted by interposing several types of attachments prepared separately between the bracket 10 and the ram 51a.

[0034] Conversely, when disassembling, when the hydraulic pressure of the hydraulic jack 50A is released, the ram 51a slowly descends, and at the same time, the bracket 10 can be lowered together with the jack 100 and the square support column 110. Note that the auxiliary jack 50 does not necessarily have to be a hydraulic jack 50A, and the number of auxiliary jacks 50 used is not limited as long as it is two or more.

[0035] Next, in the system configured as described above, the operation of removing the jack 100 from the square support column 110 will be described in the order of (A) to (F) using FIG. 4.

[0036] (A) of FIG. 4 shows a state where concrete is placed in the formwork 106 (see FIG. 1), and the formwork 106 is held by the square column 110 and the jack 100. In this state, the jack 100 is attached to the lower end of the square column 110 that supports the formwork 106. Also, between the lower end of the square column 110 and the first pedestal 103A of the jack 100, the base plate 110A of the square column 110 is placed on the base plate 105A of the first pedestal 103A, and the first pedestal 103A and the square column 110 are butted and overlapped and joined. Further, the space between the base plate 105A and the base plate 110A is removably joined and fixed by bolts and nuts 112.

[0037] When disassembling the formwork 106 from the state of holding the formwork 106 at a predetermined position in this way, first, as shown in (B) of FIG. 4, the bracket 10 is attached to the back surface of the jack 100. When attaching this bracket 10, the first bracket half 11A and the second bracket half 11B are butted against each other, and the corner portions of the base plate 105A of the jack 100 and the corner portions of the base plate 110A on the side of the square column 110 that overlap each other are engaged with the hook portions 21, and the first bracket half 11A and the second bracket half 11B are joined by bolts 23 and nuts 24. As a result, the upper horizontal wall portion 14 of the bracket 10 is placed on the back surface (lower surface) of the first pedestal 103A of the jack 100, and the bracket 10 is fixed to the jack 100 and the square column 110.

[0038] Next, as shown in (C) of FIG. 4, a pair of hydraulic jacks 50A with a manual hydraulic pump 51 attached to each of the gaps between the lower surface of the bracket 10 and the receiving base 111 are arranged.

[0039] Once the hydraulic jack 50A is positioned, as shown in Fig. 4(D), reciprocally rotate the operation lever 51A of the manual hydraulic pump 51 up and down to send oil (hydraulic fluid) into the hydraulic jack 50A, and raise it while adjusting the amount of hydraulic fluid inside the hydraulic jack 50A until the ram 51a abuts against the lower surface of the bracket 10. Further, raise the ram 51a together with the bracket 10 and the square pillar 110 to eliminate the load acting between the first pedestal 103A and the spindle 102. In this state, when the operation handle 104 of the jack 100 is rotationally operated as necessary, the spindle 102 of the jack 100 can be gently rotated. Also, when the operation handle 104 is gently tapped with a hammer or the like as necessary, the load condition can be confirmed by the change in the knocking sound.

[0040] Then, when the spindle 102 can be rotated by the operation handle 104, as shown in Fig. 4(E), rotate the spindle 102 until the second pedestal 103B of the jack 100 reaches the height required for disassembly, and separate the second pedestal 103B from the receiving base 111.

[0041] Subsequently, as shown in Fig. 4(F), drain the oil from the hydraulic jack 50A, lower the jack 100 until the lower surface (base plate 105B) of the second pedestal 103B abuts against the receiving base 111, and remove the hydraulic jack 50A from below the bracket 10. Then, when the bolts 23 and nuts 24 of the bracket 10 are removed, the bracket 10 can be disassembled into the first bracket half 11A and the second bracket half 11B and removed from the jack 100 side.

[0042] Therefore, when removing the jack 100, for example, with the bracket body 11 attached to the back surface of the first pedestal 103A, a hydraulic jack 50A, which is a separately prepared auxiliary jack, is attached to the lower surface of the bracket body 11, that is, the back surface side facing the second pedestal 103B. By applying a pressing force to the bracket 10 toward the back surface side of the first pedestal 103A with the attached hydraulic jack 50A and pushing the bracket 10 toward the first pedestal 103A side to lift the bracket 10 and the jack 100 together, the large load applied to the screw portion between the first pedestal 103A and the spindle 102 is reduced. As a result, the load due to the biting engagement of the screws between the first pedestal 103A and the spindle 102 is reduced. Thereby, the spindle 102 can be rotated with a small force using the operation handle 104 to lift the second pedestal 103B and remove the jack 100. Also, since the spindle 102 can be easily rotated using the operation handle 104, in the present invention, instead of strongly hitting the operation handle 104 with a hammer or the like when operating the operation handle 104 in the prior art, it is only necessary to lightly hit it as needed, which can reduce the noise during construction and prevent damage to the operation handle 104 and the like.

[0043] Next, in this system, the operation of attaching the jack 100 to the square column 110 and holding a load such as the formwork 106 at a predetermined position with the jack 100 and the square column 110 will be described in the order of (A) to (F) using FIG. 5.

[0044] (A) of FIG. 5 shows a state where the jack 100 is attached to the lower end of the square column 110 and a load such as the formwork 106 is held at a predetermined temporary position. Between the lower end of the square column 110 and the first pedestal 103A of the jack 100, the base plate 110A of the square column 110 is placed on the base plate 105A of the first pedestal 103A, and the first pedestal 103A and the square column 110 are butted and overlapped and coupled. Further, the space between the base plate 105A and the base plate 110A is removably coupled and fixed with bolts and nuts 112.

[0045] Thus, when supporting the load such as the formwork 106 at a predetermined position from the state of holding the load on the formwork 106 or the like at a predetermined temporary position with the square pillar 110 and the jack 100, first, as shown in FIG. 5(B), the bracket 10 is attached to the back surface of the jack 100. When attaching this bracket 10, the first bracket half 11A and the second bracket half 11B are butted against each other, and the corner of the base plate 105A of the jack 100 and the corner of the base plate 110A on the side of the square pillar 110 that overlap each other are engaged with the hook portion 21 respectively, and the space between the first bracket half 11A and the second bracket half 11B is coupled with bolts 23 and nuts 24. As a result, the upper horizontal wall portion 14 of the bracket 10 is attached to the back surface (lower surface) of the first pedestal 103A of the jack 100, and the bracket 10 is fixed to the jack 100 and the square pillar 110.

[0046] Next, as shown in FIG. 5(C), a pair of hydraulic jacks 50A each having a manual hydraulic pump 51 attached thereto are arranged in the gap between the lower surface of the bracket 10 and the receiving base 111.

[0047] After arranging the hydraulic jacks 50A, as shown in FIG. 5(D), the operation lever 51A of the manual hydraulic pump 51 is reciprocally rotated up and down, oil (hydraulic oil) is sent into the hydraulic jacks 50A, and while adjusting the amount of hydraulic oil inside the hydraulic jacks 50A, the jack 100 is raised until the attachment 52 abuts against the lower surface of the bracket 10 and the base plate 105B of the jack 100 floats from the receiving base 111. As a result, the load applied between the first pedestal 103A and the spindle 102 is reduced. In this state, when the operation handle 104 of the jack 100 is rotated, the spindle 102 of the jack 100 can be gently rotated and lowered until the second pedestal 103B abuts on the receiving base 111. Also, if necessary, the spindle 102 can be easily rotated by gently hitting the operation handle 104 with a hammer or the like.

[0048] When the rotation of the spindle 102 by the operation handle 104 becomes possible, as shown in (E) of FIG. 5, when the hydraulic oil of the hydraulic jack 50A is drained, the hydraulic jack 50A is removed from the bracket 10, and the load such as the formwork 106 can be held at a predetermined position by the jack 100 and the square column 110. (F) of FIG. 5 shows the state after the bracket 10 is removed.

[0049] Note that the present invention can be modified in various ways without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

Explanation of Signs

[0050] 10: Bracket 11: Bracket main body 11A: First bracket half body 11B: Second bracket half body 12: Fixed member 13: Vertical wall portion 14: Horizontal wall portion 14A: Horizontal wall portion 14B: Horizontal wall portion 15: Left and right arm portions 16: Protruding portion 17: Butting surface 18: Recess 19: Recess 20: Horizontal protruding piece 21: Hook portion 22: Mounting hole 23: Bolt 24: Nut 50: Auxiliary jack 50A: Hydraulic jack 51: Manual hydraulic pump 51A: Operation lever 51a: Ram 52: Attachment 100: Jack 101: Thread groove 102: Spindle 103: Pedestal 103A: First pedestal 103B: Second pedestal 104: Operating handle 105A: Base plate 105B: Base plate 106: Formwork 110: Square pillar 110A: Base plate 111: Support stand

Claims

1. A jack bracket used when attaching or detaching a jack, which includes a spindle with a thread groove engraved on its outer peripheral surface, a pair of pedestals consisting of a first pedestal and a second pedestal respectively separated in the axial direction of the spindle and arranged on the spindle, and an operation handle for rotating the spindle, to the lower end side of a square pillar, comprising: It has a bracket body that is detachably attached to the jack by attaching it to the back surface of the first pedestal. The bracket body is configured such that a pressing force for pressing the first pedestal by an auxiliary jack can be applied from the surface side of the second pedestal toward the back surface side of the first pedestal. A jack bracket characterized by the above.

2. The bracket body consists of a first bracket half and a second bracket half that can be butt - joined, each having a recess for accommodating the spindle and allowing the spindle to escape on surfaces facing each other, and the first bracket half and the second bracket half are integrally formed so as to be decomposable from each other. The jack bracket according to Claim 1, characterized by the above.

3. A method for detaching a jack, which includes a spindle with a thread groove engraved on its outer peripheral surface, a pair of pedestals consisting of a first pedestal and a second pedestal respectively separated in the axial direction of the spindle and arranged on the spindle, and an operation handle for rotating the spindle, from the lower end side of a square pillar, comprising: After arranging a bracket against the back surface of the first pedestal, applying a pressing force from the side facing the surface of the second pedestal toward the back surface side of the first pedestal to the bracket by an auxiliary jack, and operating the operation handle in a state where the load on the second pedestal is reduced. A method for detaching a jack characterized by the above.

4. A method for attaching a jack, which includes a spindle with a thread groove engraved on its outer peripheral surface, a pair of pedestals consisting of a first pedestal and a second pedestal respectively separated in the axial direction of the spindle and arranged on the spindle, and an operation handle for rotating the spindle, to the lower end side of a square pillar, comprising: After arranging a bracket on the back surface of the first pedestal, an auxiliary jack is used to apply a pressing force to the bracket from the side facing the surface of the second pedestal toward the back surface side of the first pedestal to lift the second pedestal, and then the operation handle is operated to lower the second pedestal to a predetermined position. A method for attaching a jack, characterized by the above.

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