JP2011137334A - Timbering jack down device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To jack down a timbering by an inexpensive device noiselessly with high safety. <P>SOLUTION: This timbering jack down device includes a reaction force receiver 11 for a hydraulic cylinder 10 and a ratchet wheel 12 attached to the handle of a screw jack not to rotate therearound. The reaction force receiver 11 is supported on a horizontal member while being non-rotatably locked to a strut for timbering to the upper end with the screw jack attached. The base end of the body of the hydraulic cylinder 10 is rotatably supported on the reaction force receiver 11. A ratchet claw engagement element 32 engaged with the ratchet claw 31 of the ratchet wheel 12 is attached to the front end of the extending/retracting shaft 10a of the hydraulic cylinder 10. By extending and retracting the shaft 10a of the hydraulic cylinder 10, the ratchet claw engagement element 32 is engaged with the ratchet claw 31 during the extension, and the ratchet wheel 12 is rotated in the jack down direction. <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 that rotates, a hydraulic cylinder that moves the handle in a jackdown direction, a reaction force receiver that transmits a reaction force of the hydraulic cylinder to the support, and a rotation stop against the handle A ratchet wheel mounted in a state, and the reaction force receivers cross each other in a horizontal direction with their ends fixed to a support column having a screw jack for adjusting the height of the support. Oriented It is supported by the cross member in a state in which it is prevented from rotating by being spanned between the cross members, and the base end portion of the cylinder body of the hydraulic cylinder is rotatably supported with respect to the reaction force receiver, A ratchet pawl engaging element that engages with the ratchet pawl of the ratchet wheel is attached to the tip of the telescopic shaft that is moved in and out by the hydraulic pressure of the hydraulic cylinder, and the push-out operation is performed by moving the telescopic shaft of the hydraulic cylinder in and out. In some cases, the ratchet pawl engaging element engages with the ratchet pawl to rotate the ratchet wheel in the jack down direction.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the ratchet wheel includes a disc-shaped main body portion through which a screw shaft of the screw-type jack is inserted in the center, and an outer peripheral surface of the main body portion. A large number of ratchet claws projecting at regular intervals, the body is assembled into a disk shape by joining a pair of semicircular halves together, and the handle of the jack fits on the lower surface The fitting recess is provided integrally.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, the reaction force receiver is one of the cross members having different orientations intersecting each other in the horizontal direction. It has a hydraulic cylinder support shaft on a support column supported upright on a cross member, and has an oblique connection member spanned between the other cross members from the upper end of the support column.

  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.

  The present invention further includes a reaction force receiver that transmits a reaction force of the hydraulic cylinder to a support, and a ratchet wheel that is attached in a state of being prevented from rotating with respect to the handle. A state where the screw-type jack for adjusting the work height is locked against the support column attached to the upper end by spanning between different cross members in the direction that intersects each other in the horizontal direction with the end fixed. Is supported by the cross member, and a base end portion of the cylinder body of the hydraulic cylinder is rotatably supported with respect to the reaction force receiver, and at the distal end of the telescopic shaft that is moved in and out by the hydraulic pressure of the hydraulic cylinder. A ratchet pawl engaging element that engages with the ratchet pawl of the ratchet wheel is attached, and when the telescopic shaft of the hydraulic cylinder is moved in and out, the pushing operation is performed. The ratchet pawl engaging element engages with the ratchet pawl to rotate the ratchet wheel toward the jack down direction, thereby rotating the screw shaft lifting / lowering operation nut toward the screw shaft retracting side. Thus, it is possible to provide a jackdown device having a simple structure, high safety, and good operability.

  Further, in the present invention, the ratchet wheel has a disk-shaped main body portion through which the screw shaft of the screw-type jack is inserted in the center, and a large number of ratchet claws protruding at regular intervals on the outer peripheral surface of the main body portion, The body part is assembled in a disc shape by joining and combining a pair of semi-circular halves, and a support fitting work is provided by integrally providing a handle fitting recess in which the handle of the jack fits on the lower surface. It can be easily attached to and detached from the screw jack for height adjustment.

  Further, in the present invention, the reaction force receiver is configured such that a hydraulic cylinder support shaft is mounted on a support column supported on one of the cross members having different orientations that intersect in the horizontal direction. And having a structure having an oblique connecting member spanned between the other cross member from the upper end of the support column, an apparatus that can be easily attached to and detached from the support column and has good operability can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the 1st Example of this invention and shows the use condition of a support jackdown apparatus. It is the same top view. It is a longitudinal cross-sectional view which shows a support | pillar part same as the above. It is the sectional view on the AA line in FIG. It is a bottom view of the ratchet wheel part of the jackdown apparatus shown in FIG. It is a side view which shows the 2nd Example of this invention. It is the same top view.

  Next, embodiments of the present invention will be described based on the examples shown in the drawings. 1 to 5 show a first embodiment of a support jackdown apparatus according to the present invention. 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 in the jackdown direction by hydraulic pressure, and transmits the hydraulic cylinder 10 and the reaction force of the hydraulic cylinder 10 to the support column 2. The reaction force receiver 11 and a ratchet wheel 12 attached to the handle 6 of the screw jack 3 are configured.

  The reaction force receiver 11 is fixed in a state where the end is fixed to the support column 2 with the screw type jack 3 attached to the upper end and is suspended by crossing between the cross members in directions intersecting each other. In this example, there are two X-axis cross members 15 and two orthogonally arranged end faces with the support struts 2 sandwiched between them. It is supported by spanning the Y-axis direction cross members 16 and 16.

  The reaction force receiver 11 has a support column 20 erected on the X-axis direction cross member 15 and is fitted to the lower end of the support column 20 so as to straddle the X-axis direction cross member 15 in a horseshoe shape. An X-axis direction transverse member fitting concave portion 21 is formed, and a hydraulic cylinder support shaft 22 is erected vertically at the upper end portion of the support column 20, and the end portion of the hydraulic cylinder 10 rotates on this. It is supported movably. The column 20 has a hydraulic cylinder support shaft 22 that is substantially the same height as the ratchet wheel 12.

  An oblique connecting member 23 is stretched between the upper end of the support column 20 and both Y-axis direction cross members 16 and 16. In this example, the oblique connecting member 23 has a plate shape having a substantially isosceles triangle shape, and a hanging wall 23a directed downward is integrally formed on the entire periphery of the oblique connecting member 23, and a vertex portion between the isosceles sides. The support column 20 is fixed to the side end.

  The oblique connecting member 23 has an inclined portion that is inclined so as to reach the Y-axis direction cross members 16 and 16 from the upper end portion of the support column 20, and the lower edge of the hanging wall 23 a is inverted U under the both side portions of the end portion. Y-axis direction cross member fitting recesses 24, 24 that are recessed in a letter shape and are fitted on the Y-axis direction cross members 16, 16 so as to straddle a horseback are formed.

  At the center of the other end side of the diagonal connecting member 23, a U-shaped support column fitting recess 25 is formed in which the support column 2 is fitted, and this is fitted to the support column 2. In this state, the Y-axis cross member fitting recesses 24, 24 are fitted to the Y-axis cross members 16, 16 described above, and the X-axis cross member fitting recess 21 of the support column 20 is set in the X-axis direction. The entire reaction force receiver 11 is supported by the support under the screw-type jack so as not to move by being fitted to the cross member 15.

  The ratchet wheel 12 is supported on the handle 6 of the screw jack 3 so as not to rotate. The ratchet wheel 12 has a disk-shaped ratchet wheel main body 30 and has a large number of ratchet claws 31, 31...

  When this ratchet pawl 31 is on one side surface of the ratchet wheel main body 30, the ratchet pawl engagement element comprising a rotating roller attached to the tip of the telescoping shaft 10 a of the hydraulic cylinder 10 is moved in and out. This is formed into a non-return claw shape that is engaged during the pushing direction operation 32 and is not engaged during the backward operation.

  Therefore, the ratchet pawl engagement element 32 is engaged with the ratchet pawl 31 during the pushing operation by pushing the ratchet pawl engagement element 32 against the one side surface of the ratchet wheel 12 and moving the telescopic shaft 10a of the hydraulic cylinder 10 in and out. Then, the ratchet wheel 12 is rotated, and the operation in which the ratchet pawl engagement element 32 is retracted to the next ratchet pawl 31 position by the backward movement is repeated, so that the ratchet wheel 12 is rotated in the backward direction of the screw jack 3. It has become.

  A screw shaft through hole 35 is formed at the center of the disc shape of the ratchet wheel 12, and a handle fitting recess 36 in which the handle 6 of the screw jack 3 is fitted is formed on the lower surface. The recess 36 is formed by projecting a pair of ribs 36a, 36a having a shape matching the side shape of the handle downward.

  The handle 6 is rotated by rotating the ratchet wheel 12 with the handle 6 fitted in the handle fitting recess 36.

  The ratchet wheel 12 is assembled in a disk shape by combining halves 12a and 12b formed in half, and the joint edge of one half 12a has the other on its upper and lower surfaces. Connecting pieces 37, 37 facing toward the half body 12 b, the other half body 12 b is inserted between the connecting pieces 37, 37, the two halves are joined, and these are penetrated to fix the pins. The halves are connected by inserting 38.

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

  First, the reaction force receiver 11 and the ratchet wheel 12 are set on a support work. The hydraulic cylinder 10 is attached to the reaction force receiver 11 in advance with respect to the hydraulic cylinder support shaft 22. The reaction force receiver 11 is mounted by lowering the entire structure in a state where the support column 2 is fitted in the support column fitting recess 25, and the X axis direction horizontal member 15 is inserted into the X axis direction horizontal member fitting recess 21. This is done by fitting the Y-axis direction cross member 16 into the Y-axis direction cross member fitting recesses 24, 24.

  In addition, the ratchet wheel 12 is mounted by joining the halves 12a and 12b from both sides around the screw shaft 5 on the upper side of the handle 6 of the screw-type jack 3, and the screw shaft 5 in the screw shaft through hole 35 in the center portion. Assemble the disc with the inserted. The handle 6 is lowered in this state, and the handle 6 is fitted into the handle fitting recess 36 on the lower surface thereof.

  In this way, the support jackdown device is mounted, and the hydraulic cylinder 10 is operated while the ratchet pawl engagement element 32 of the hydraulic cylinder 10 is pressed against the side surface of the ratchet wheel 12 to reciprocate the ratchet pawl engagement element 32. As a result, the ratchet wheel 12 is rotated when the ratchet pawl engaging element 32 is pushed out, and the handle 6 is rotated in the jack-down direction.

  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.

  In the above-described embodiment, a plate-like material having a substantially isosceles triangle shape is used as an oblique connecting material spanned between the other side members from the upper end of the support column. As shown in FIG. 4, a rod-shaped diagonal connecting member 40 spanned between the upper end of the support column 20 and one Y-axis direction cross member 16 may be used. In this case, as shown in the figure, it is preferable to use a horizontal connecting member 41 that connects the support column 20 and the support column 2.

  In addition, since parts other than the diagonal connecting member 40 and the horizontal connecting member 41 are the same as those in the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Support jackdown apparatus 2 Supporting support pillar 3 Screw type jack 4 Screw shaft 5 Screw cylinder 6 Handle 7 Loading platform 10 Hydraulic cylinder 10a Entrance / exit rod 11 Reaction force receiver 12 Ratchet wheel 12a Half body 12b Half body 15 X axis direction sideways Material 16 Y-axis direction transverse member 20 Strut 21 X-axis direction transverse member fitting recess 22 Hydraulic cylinder support shaft 23 Oblique connecting member 23a Hanging wall 24 Y-axis direction transverse member fitting recess 30 Ratchet car body 31 Ratchet claw 32 Ratchet claw Engagement element 35 Screw shaft through hole 36 Recess 36a Rib 37 Connection piece 38 Fixing pin 40 Connection material 41 Horizontal connection material

Claims (3)

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 hydraulic cylinder that operates the handle in a jack-down direction, a reaction force receiver that transmits a reaction force of the hydraulic cylinder to a support, and a ratchet wheel that is attached in a state of being prevented from rotating with respect to the handle,
The reaction force receiver is hung between cross members of different orientations crossing each other in the horizontal direction with the ends fixed to the support pillars with the screw jacks for adjusting the support height attached to the upper ends. Supported by the cross member in a state of being prevented from rotating by passing,
A base end portion of the cylinder body of the hydraulic cylinder is rotatably supported with respect to the reaction force receiver, and at the tip of the telescopic shaft that is moved in and out by the hydraulic pressure of the hydraulic cylinder against the ratchet pawl of the ratchet wheel. An engaging ratchet pawl engaging element is attached,
A support jackdown device in which the ratchet pawl engaging element engages with the ratchet pawl when the telescopic shaft of the hydraulic cylinder is moved in and out to rotate the ratchet wheel in the jackdown direction. .   The ratchet wheel has a disc-shaped main body portion through which a screw shaft of the screw-type jack is inserted in the center, and a large number of ratchet claws protruding at regular intervals on the outer peripheral surface of the main body portion, and the main body portion is semicircular The support jack down according to claim 1, wherein the pair of half-shaped halves are assembled into a disk shape by joining and combining with each other, and a handle fitting concave portion into which a handle of the jack fits is integrally provided on a lower surface. apparatus.   The reaction force receiver has a hydraulic cylinder support shaft on a support column supported on one of the cross members having different orientations intersecting with each other in the horizontal direction, and an upper end of the support column. The support jackdown device according to claim 1, further comprising an oblique connecting member that is stretched between the other cross member from the portion.

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