JP2011137333A - Timbering jack down device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To jack down a timbering with an inexpensive device noiselessly with high safety. <P>SOLUTION: This timbering jack down device 1 is configured so that the handle 6 of a screw jack including a screw shaft 4 with one end of inserted into the end part of a strut for timbering and a screw tube 5 screwed with the outer periphery of the screw shaft 4 and on the outer periphery of which the handle 6 is disposed to project radially is rotated to the retreating side of the screw shaft 4. The timbering jack down device includes a hydraulic cylinder 10 for operating the handle 6 in the jack down direction and a reaction force receiver for the hydraulic cylinder 10. The reaction force receiver includes a jack support base attached to the outer periphery of the strut for timbering preventing rotation therearound. The hydraulic cylinder 10 is fixed to the jack support base. The front end of the extending/retracting rod 10a of the hydraulic cylinder 10 is made to abut on the side surface of the handle 6, and the cylinder is operated so that a nut for lifting the screw shaft 4 can be rotated in the retreating direction of the screw shaft 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mainly relates to a support jackdown device for releasing a load applied to a screw jack for adjusting the height of a support used for supporting a formwork when a concrete structure is constructed.

  In general, a support structure for supporting a formwork is used for the construction of a concrete structure. There are various support works such as a frame support work, a column-type support work, and a wedge-type support work, and jacks for adjusting the height are generally used at the upper and lower ends. Since a large number of jacks are required, a manual vertical screw shaft type jack is usually used.

  This jack has little or no load when assembling the formwork, so the height can be easily adjusted manually, but it will support the load after placing concrete. Therefore, a large load is applied, and when removing the support after the concrete is hardened, a large force is required for the jack-down operation for rotating the handle in order to shrink the screw-type jack.

  For this reason, conventionally, an operator has struck a handle using a hammer to rotate the jack in a direction to retract, that is, an unloading direction.

  However, this method generates a loud noise and strikes a handle which is a small part with a set hammer, and the work is often done at a high place, so there is a problem in safety. there were.

  In order to solve such a problem, a stretchable part is provided in a part of the support column, a taper surface directed in the circumferential direction is used, and the upper and lower cylinder parts are relatively moved along the taper. Supporting strut with jack-down device that slightly reduces the length of the supporting strut by turning or moving the moving member sandwiched between the tapered surfaces to bring them closer to each other Have been developed (for example, Patent Documents 1, 2, and 3).

JP-A-7-197672 Japanese Patent Laid-Open No. 7-310443 JP 2007-205081 A

  All of the devices shown in the above-mentioned patent documents have lower noise and higher safety than those in which the handle is struck with a hammer, but all of these devices are jacked down in the middle of the support column. Since the structure is complicated and a large load resistance is required, the support column becomes expensive.

  Furthermore, since it is necessary to use an expensive support column provided with this expansion / contraction mechanism for all the vertical columns supporting the formwork, there is a problem that the entire support column is expensive.

  In view of such a conventional problem, the present invention can easily perform jackdown in support work using an inexpensive support strut having a simple shape and a screw-type jack that does not have a conventional extension mechanism. The purpose of the present invention is to provide a jack-down device with a small number of jack-down devices that is noise-free and highly safe.

  The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving an intended purpose is a screw shaft having one end inserted into an end portion of a columnar support column, The handle of the screw-type jack for adjusting the support height, which has a screw cylinder that is screwed onto the outer periphery of the screw shaft and has a handle projecting radially on the outer periphery, in a direction to move toward the screw shaft retreat side. A support jackdown device for rotating, comprising: a hydraulic cylinder that moves the handle in a jackdown direction; and a reaction force receiver that transmits a reaction force of the hydraulic cylinder to the support.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the reaction force receiver is supported by a jack that is attached to a shape projecting to the outer periphery in a state in which the reaction force receiver is prevented from rotating with respect to the support column. The hydraulic cylinder is fixed so that the loading / unloading rod is moved in and out horizontally on the jack support table, and the hydraulic cylinder is brought into contact with the side surface of the handle. By operating, the screw shaft lifting / lowering nut is rotated in a direction to move to the screw shaft retreat side.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the jack support base has a column through hole through which the support column is inserted in a central portion, and communicates with the opening on the lower surface side. A lower plate that integrally has a detent cylinder, and an upper plate that can be fixed on the lower plate so that the relative angle in the circumferential direction can be adjusted relative to the lower plate. Is fixed, and the hydraulic cylinder position relative to the handle can be adjusted by adjusting the relative circumferential angle with respect to the lower plate.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the two plates of the jack support base each fix the halves divided into two by a line passing through the center of the detent cylinder. This is because it can be assembled into a disk shape.

  The present invention includes a screw shaft having one end inserted into an end portion of a columnar support column, and a screw cylinder screwed onto the outer periphery of the screw shaft and having a handle projecting radially on the outer periphery. By operating the handle of the screw-type jack for adjusting the support height in the jack-down direction using a hydraulic cylinder and a reaction force receiver that transmits the reaction force of the hydraulic cylinder to the support Because there is no noise when hitting with a hammer like before, and because it can be installed and operated only during jackdown operation to the existing support column, it is supported as before The cost can be significantly reduced as compared with a structure that must be installed in advance on all support columns that use a screw-type jack for adjusting the work height.

  Further, in the present invention, the reaction force receiver is configured to have a jack support base that is attached to a shape projecting to the outer periphery in a state in which the reaction force receiver is prevented from rotating with respect to the support column, and is horizontally mounted on the jack support base. The hydraulic cylinder is fixed so that the entrance / exit rod is moved in / out of the arrangement, and the nut for moving the screw shaft is operated by operating the hydraulic cylinder by bringing the tip of the entrance / exit rod into contact with the side surface of the handle. By rotating in the direction of moving toward the screw shaft retreat side, a jackdown device with a simple structure, high safety, and good operability can be provided.

  Further, in the present invention, the jack support base has a column through hole through which the support column is penetrated in a central part, and a lower plate integrally including a rotation prevention cylinder communicating with the opening on the lower surface side, On the lower plate, there is an upper plate that can be fixed so that the circumferential relative angle can be adjusted relative to the lower plate. A hydraulic cylinder is fixed to the upper plate, and the relative circumferential angle with respect to the lower plate By adjusting the position of the hydraulic cylinder with respect to the handle, it is possible to provide a device that can be easily attached to and detached from the support column and has good operability.

  Further, in the present invention, the two plates of the front jack support base are each assembled in a disk shape by fixing the halves divided into two by a line passing through the center of the detent cylinder, respectively. It becomes easy to attach and detach the support column.

It is a longitudinal cross-sectional view which shows the use condition of the support jackdown apparatus which concerns on this invention. It is a top view which shows the jackdown apparatus part same as the above. It is a bottom view same as the above. It is a disassembled perspective view of the jackdown apparatus.

  Next, embodiments of the present invention will be described based on the examples shown in the drawings. 1-3 has shown the state which attached the support jackdown apparatus which concerns on this invention to the support | pillar for support supporting the formwork. Reference numeral 1 in the figure is a support jackdown device, 2 is a cylindrical support strut constituting the support, and 3 is a screw type jack for adjusting the support height.

  The screw-type jack 3 includes a screw shaft 4 having a male screw on the outer periphery, and a screw tube 5 in which a female screw to be screwed onto the male screw of the screw shaft is formed on the inner surface of the short cylindrical tube. A pair of handles 6 and 6 projecting radially from each other are provided at positions symmetrical to each other. A loading table 7 is rotatably attached to the protruding end of the screw shaft 4. Further, the base end side of the screw shaft 4 is rotatably fitted in the end portion of the support column 2, and the screw cylinder 5 screwed on the outer periphery thereof is brought into contact with the end surface of the support column 2. The position of the loading platform 7 relative to the support column 2 is changed by moving the position of the screw cylinder 5 relative to the screw shaft 4 in the axial direction.

  The support jackdown device 1 is for operating the handle 6 of the screw-type jack 3 to rotate in the jackdown direction by hydraulic pressure, and supports the hydraulic cylinder 10 and the reaction force of the hydraulic cylinder 10 as shown in FIG. It is comprised from the reaction force receiver transmitted to the support | pillar 2 for a work.

  The reaction force receiver is constituted by a disk-shaped jack support 11 that is attached to a shape projecting on the outer periphery in a state in which the reaction force receiver is prevented from rotating with respect to the support column 2. The jack support 11 is composed of a disk-like upper plate 12 and lower plate 13, and column through holes 14 and 15 through which the support column 2 is vertically penetrated are opened at the center.

  On the lower surface of the lower plate 13, a short cylindrical anti-rotation cylinder 16 communicating with the support column through hole 15 is projected.

  The upper and lower plates 12 and 13 are each formed in a disc shape by joining half-divided halves 12a and 12b and 13a and 13b, and the anti-rotation cylinder 16 on the lower surface of the lower plate 13 is also divided in half. Is formed.

  The upper plate 12 is integrally formed with brackets 17, 17 projecting upward from the joining edges of the halves 12 a, 12 b on the upper surface side, and a bolt 18 is used to fix these brackets together. Can be assembled.

  In the lower plate 13, brackets 19, 19 projecting downward from the joint edges of both halves are integrally formed, and the lower plate 13 is fixed by bolts 20 between the brackets. It can be assembled into a disk shape. Note that one end of each of the brackets 19, 19 is integrated with the outer side of the halved partial joint edge of the rotation stopper cylinder 16.

  Between the upper and lower plates 12 and 13, the upper and lower plate fixing bolts 27 are screwed through the bolt insertion holes 26 formed in the upper plate 12 to the fixing holes 25 formed at regular intervals on the peripheral edge of the lower plate 13. It is supposed to be fixed. The circumferential angle of the upper plate 12 with respect to the lower plate 13 can be adjusted by selecting the fixing hole 25.

  A pin insertion hole 22 that can be communicated with a lateral hole 21 formed in the support column 2 is horizontally opened in the detent tube 16, and as shown in the figure, the support column is provided in the detent tube 16. 2, the half bodies 13 a and 13 b are fixed to each other, the lower plate 13 is assembled, and the detent pin 23 is inserted into the pin insertion hole 20 of the detent cylinder 16 and the lateral hole 19 of the support column 2. Thus, the lower plate 13 is fitted in a state in which it is prevented from rotating with respect to the support column 2.

  The non-rotating pin 23 has a male screw engraved on the outer periphery of the base end portion thereof, and is set so as not to fall off by being screwed into a female screw in the pin insertion hole 20.

  A pair of hydraulic cylinders 10 and 10 are fixed to the upper plate 12 by bolts at a point-symmetrical position with the center portion as the center. The both hydraulic cylinders 10 are fixed in a direction in which the access rods 10a and 10a pushed out by hydraulic pressure are moved in and out toward the tangential direction of the same circle, whereby the pair of handles 6 and 6 of the screw-type jack 3 are fixed. The entrance / exit rods 10a and 10a are brought into contact with a side surface which is turned to the jack down direction side, that is, the side where the screw shaft 4 is retracted.

  Next, the jack down process using the support jack down apparatus comprised in this way is demonstrated.

  First, the lower plate 13 is attached to the support column 2 in which the screw type jack 3 for performing the jackdown operation is used. In this attachment, the half body 12a, 12b is bolted so that the support column 2 is fitted in the rotation stopper cylinder 16. Thereafter, the detent pin 23 is inserted through the pin insertion hole 20 of the detent cylinder 16 into the lateral hole 21 of the support column 2.

  After fixing the lower plate 13 to the support column 2 in this manner, the upper plate 12 is assembled thereon so that the support column 2 is inserted into the column through hole 14. Thereafter, the relative circumferential angle of the upper plate 12 with respect to the lower plate 13 is adjusted. Thus, the bolt insertion hole formed in the upper plate 12 with respect to the fixing hole 25 closest to the position where the access rod 10a of the hydraulic cylinder 10 contacts the side surface on the side where the handle 6 of the screw-type jack 3 is rotated in the jack down direction. The upper and lower plate fixing bolts 27 are screwed through 26.

  In this way, the upper and lower plates 12 and 13 are fixed to each other to assemble the jack support 11 that is a reaction force receiver. In this state, hydraulic pressure is supplied to the hydraulic cylinders 10 and 10 to push out the entrance / exit rods 10a and 10a, thereby rotating the handles 6 and 6 in the jack-down direction to release the load on the jacks.

  After the jackdown of one supporting column 2 is completed in this way, the supporting jackdown device is removed and used for jacking down another supporting column 2.

DESCRIPTION OF SYMBOLS 1 Supporting jack down apparatus 2 Supporting support pillar 3 Screw type jack 4 Screw shaft 5 Screw cylinder 6 Handle 7 Loading platform 10 Hydraulic cylinder 10a In / out rod 11 Jack support stand 12 Upper plate 12a, 12b Half body 13 Lower plate 13a, 13b Half body 14, 15 Column through-hole 16 Anti-rotation cylinder 17 Bracket 18 Bolt 19 Bracket 20 Bolt 21 Horizontal hole 22 Pin insertion hole 23 Anti-rotation pin 25 Fixing hole 26 Bolt insertion hole 27 Upper and lower plate fixing bolt

Claims (4)

Supporting height having a screw shaft having one end inserted into an end portion of a columnar support column, and a screw cylinder screwed onto the outer periphery of the screw shaft and having a handle protruding radially on the outer periphery. A support jack down device for rotating the handle of the screw jack for adjustment in a direction to move to the screw shaft retreat side,
A support jackdown device comprising: a hydraulic cylinder that moves the handle in a jackdown direction; and a reaction force receiver that transmits a reaction force of the hydraulic cylinder to the support. The reaction force receiver is configured to have a jack support base that is attached to a shape projecting to the outer periphery of the support pole in a state of being prevented from rotating with respect to the support column, and the input / output rod moves in and out horizontally on the jack support base. The hydraulic cylinder is fixed as
2. The hydraulic cylinder according to claim 1, wherein the nut for moving up and down the screw shaft is rotated in a direction to move the screw shaft back and forth by operating the hydraulic cylinder by bringing the tip of the entrance / exit rod into contact with the side surface of the handle. The support jackdown device described.   The jack support base has a pillar through hole through which the support pillar is penetrated in a central portion, and a lower plate integrally including a rotation-preventing cylinder communicating with the opening on the lower surface side, on the lower plate, The upper plate has an upper plate that can adjust the circumferential relative angle to the lower plate in an adjustable manner, a hydraulic cylinder is fixed to the upper plate, and the relative circumferential angle with respect to the lower plate is adjusted. The support jackdown device according to claim 2, wherein the position of the hydraulic cylinder relative to the handle can be adjusted.   3. The support structure according to claim 2, wherein the two plates of the jack support base are assembled in a disk shape by fixing the halves divided into two by a line passing through the center of the detent cylinder. Jack down device.

Images