JP4623570B2 - Construction method of jack base and formwork support - Google Patents

Description

  The present invention relates to a jack base that adjusts the height of a vertical pipe body used for a formwork support material and a scaffold material up and down. The present invention also relates to a method for constructing a formwork supporting work in which a jack base is disposed below the unitized assembly frame.

  The jack base is a metal fitting that supports a vertically standing pipe body with formwork support materials and scaffolding materials, and adjusts the height of the pipe body up and down. The conventional metal fitting is a shaft body that is inserted into the pipe body from the bottom plate. In addition, a male screw is formed on the shaft body, an annular body with a handle is screwed, and the tubular body is supported on the upper surface of the annular body.

  The conventional jack base can adjust the lower end position of the tube body to be supported only within the range of the length of the formed screw, and generally a steel rod having a length of about 300 to 600 mm has been used.

  Some support works for supporting concrete molds are unitized by placing a jack base at the bottom of the assembly frame. When assembling the support, first arrange the ring base position of the jack base at a predetermined interval, after placing the assembly frame on this, after adjusting the height by placing the jack on the top, A large draw was placed to support the beam formwork or floor slab formwork.

  When moving these units after placing concrete, first lower the upper jack to remove the large pulling material, then raise the whole while supporting the assembly frame with a lifting machine etc., to the jack base Release the acting load and move the annular body position of the jack base downward, then store the jack base shaft body in the tube body of the assembly frame body and lock it with the hanging bracket etc. After reducing the overall height, it passed under the beam and moved to another concrete placement area while holding the unit with a lifting machine or the like.

As a construction method of the unit-type formwork supporting work including the jack base as described above, for example, there are conventional techniques as described below.
JP, 6-346597, A This technology also has a structure in which a jack base is attached to the lower end of a unit-type formwork support, and the support is lifted and supported by a moving carriage with a lifting platform inserted below the frame. Met. When the unit was moved to the next work site, first, the screw bases with handles of all jack bases were rotated in one direction to shorten the jack base length, thereby shortening the overall length of the support work.

  However, when the annular body is moved to the target position in the conventional jack base, it is necessary to always rotate the handle along the screw. In particular, when diverting unit-type formwork supports, it is generally necessary to pass under the beam, and in order to significantly reduce the overall height of the support work, it is necessary to adjust the length of the jack base significantly. It is indispensable, and it takes a lot of time to perform all this adjustment by rotating the handle, and the merit of diverting the unit has been halved in the method of supporting the formwork that repeats this work for each diversion.

  The present invention has been made to solve the above-described problems of the conventional jack base and the method of constructing the unit type formwork including the jack base, and shortening the time for adjusting the length of the jack base. The purpose of the present invention is to provide a construction method for unit-type formwork support with enhanced diversion merit.

  In order to solve the above-mentioned problems, the jack base of the present invention has a shaft body projecting from the bottom plate, and the height of the tube body supported above the annular body through an annular body with a handle screwed to the shaft body. In the jack base that moves up and down, the shaft body includes an inner tube that is fixed to the bottom plate and has pin holes formed at appropriate intervals, a male screw that loosely inserts the inner tube, and the annular body is screwed together with a pin insertion pin. An outer tube that forms a long hole, and a connecting member that holds the lower peripheral surface of the tubular body that is fixed to the upper outer surface of the outer tube and abuts on the top of the outer tube are provided.

  The inner tube has an outer diameter that can be inserted into the tube, and the outer tube preferably has the same outer diameter as the tube to support the tube. The annular body screwed to the outer tube is supported at the lower surface by a pin inserted into the pin hole of the inner tube through the long hole, and the outer tube is moved up and down with respect to the pin by rotating the handle. When the tube load is not applied to the outer tube, pulling out the pin while holding the outer tube can immediately move the outer tube to any position of the inner tube. By inserting, you can adjust the height significantly in a short time.

  The connection member is a member that holds the tube body supported by the outer tube top so that the tube body does not come off. In the connection member according to claim 2, the connection pipe into which the tube body is inserted and the upper surface of the connection pipe It is characterized by comprising a plate material that stands upright and abuts against the tube body, and a fastening fitting for locking the tube body to the plate material.

  As the plate material, for example, angle steel is used, and a notch is provided in this, and the tube body is held by an L-shaped bolt of a fastening bracket, and a nut is fastened and locked.

  According to a third aspect of the present invention, there is provided a method for supporting a formwork, in which a jack base is disposed at a lower portion of a unitized assembly frame body, and a height adjusting member and a large pulling material are disposed at an upper portion. In the construction method of the formwork support work, which is reduced in height after installation to reduce the overall height of the support work, and then moves to another area while holding the formwork support work by a lifting machine or the like. The jack base according to claim 1 is used, and at the time of disassembly, the height adjusting member is reduced to remove the large pulling material, and the entire support work is lifted while being supported by a lifting machine or the like to act on the jack base. The inner tube is accommodated in the outer tube and the tubular body by releasing the load of the tubular body and changing the insertion position of the pin, thereby reducing the overall height of the support work.

  As a unitized assembly frame, a tower-column-type assembly frame with four faces connected in a tower shape is desirable, but if the unit shape is firmly held when supported by a lifting machine or the like The construction may be such that the parallel building frames are connected together by bracing or the like. The assembly frame is provided with a horizontal member or the like for supporting a load by contact with a lifting machine or the like.

  When the entire support work is supported by a lifting machine or the like, the tube load does not act on the outer tube. For this reason, the pin can be pulled out and the inner tube can be moved freely. It should be noted that the outer tube and the tubular body are locked and can be lifted so that the jack base and the assembly frame can be moved simultaneously. After the inner tube is housed in the outer tube and the tube, a pin is inserted into a pin hole at an appropriate position to prevent the inner tube from dropping. As for the position of this pin, a pin hole for height adjustment may be used, or it may be inserted into a pin hole dedicated to a locking provided at the lower part of the inner tube.

  The jack base according to the present invention is provided with an inner tube that is provided with pin holes at appropriate intervals and an outer tube that is screwed into an annular body with a handle, and the tube body is supported at the top of the outer tube. If the pin is pulled out while holding the outer tube while the outer tube is not working, the outer tube can be moved immediately to any position of the inner tube, eliminating the trouble of turning the handle that was required in the past, Height adjustment can be performed in a short time.

  In the jack base according to claim 2, since the connecting member includes the connection pipe and the fastening metal fitting, the tube body can be easily erected on the jack base, and the tube body is prevented from being pulled out and firmly held. can do.

  The method for constructing the formwork supporter according to claim 3 is to lift the entire support work while supporting the whole supporter with a lifting machine or the like to release the load of the tubular body acting on the jack base and to change the insertion position of the pin. Since the pipe is accommodated in the outer pipe and the pipe body, the jack base length adjustment time for passing under the beam or the like can be shortened. Therefore, the diversion of the support work can be performed smoothly, the working time is shortened, the diversion efficiency is increased, and the diversion merit is enhanced.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a front view when the jack base is used, FIG. 2 is an enlarged cross-sectional view of a main part of the jack base, and FIG. 3 is an enlarged cross-sectional view showing a III-III cross section of FIG. The jack base 1 includes an inner tube 3 projecting from the bottom plate 2, an outer tube 4 into which the inner tube 3 is loosely inserted, an annular body 5 with a handle screwed into the outer tube 4, and an upper outer surface of the outer tube 4. The connection member 6 which adheres to is provided.

  In the inner tube 3, a pin hole 3 a drilled at an appropriate interval and a long hole 4 a drilled in the outer tube 4 and a matching pin 7 are inserted. The outer tube 4 is engaged with a male ring 4b formed on the outer surface of a ring-shaped body 5 with a handle, and a lower surface of the outer tube 4 is brought into contact with the pin 7 and locked to the inner tube 3.

  The connection member 6 includes a connection pipe 8, a plate material 9 erected on the upper surface thereof, and a fastener 10, and holds the lower peripheral surface of the tube body 11 that abuts on the top 4 c of the outer tube 4 as shown in FIG. 2. To do. The connection pipe 8 has an inner diameter slightly larger than that of the outer tube 4, and a tube body 11 having the same outer diameter as that of the outer tube 4 is inserted and held by the plate material 9 and the fastening bracket 10. When the angle steel as shown in FIG. 3 is used as the plate material 9, a notch 9 a is provided in the plate material 9, and the tube body 11 is locked by the L-type bolt fastener 10.

  The fastening bracket 10 holds the tubular body 11 supported at the top of the outer tube so as not to come off, and prevents the tubular body 11 and the jack base 1 from separating when the whole is lifted. Installed above the horizontal member 12 to be taken out. The inner tube 3 has an outer diameter that can be inserted into the tube body 11, and when the load of the tube body 11 is not acting on the outer tube 4, the pin 7 can be pulled out, thereby accommodating the inner tube 3 in the tube body 11. can do.

  Next, an embodiment of the formwork support using the jack base described above in the lower part of the unitized assembly frame will be described with reference to FIG. FIG. 4 is a perspective view of the formwork support. As a unitized assembly frame, a tower column type assembly frame in which four sides are connected in a tower shape is used.

  The tower-column-type assembly frame is used to support the concrete formwork to build the beams and slabs of the building, or to support the scaffolding board. It has sufficient strength.

  The assembly frame 13 is a tubular body erected at the four corners of a flat rectangular base frame 14 placed on the jack base 1 with the level accurately aligned and four horizontal members 12 constituting the base frame 14. 11 has a stacking frame 15 for inserting and connecting the end from above, and an end frame 16 for connecting to the uppermost of these. The material 18 is placed horizontally.

  The stacked frame 15 is configured such that the height of the assembly frame 13 can be arbitrarily changed by increasing or decreasing the number of stacked frames. The left and right support columns 15a are arranged in parallel at a predetermined interval, and the left and right support columns 15a. The horizontal connection rod 15b that connects the two in a substantially H shape, and a substantially cylindrical joint 15c that is fixed to the lower end of one support 15a and the upper end of the other support 15a, respectively. 15c is inserted in such a manner that the ends of the columns 15a of the other stacking frame 15 to be alternately added in each construction surface, the tubular body 11 of the foundation frame 14, the ends of the columns 16a of the end frame 16 and the like can be removed. By doing so, the frames are connected to each other to form the assembly frame 13. The horizontal connecting rod 15b is made of an appropriate metal square pipe material or the like having a predetermined length, and a bracing attachment hole 15d for mounting the bracing 19 is formed in each of both side portions near both ends. Yes.

  Next, the construction method at the time of diversion of an assembly frame is demonstrated based on FIG. FIG. 5 is an explanatory view showing a process during movement of the formwork support. After placing the concrete, the formwork supporter 21 of the floor slab 20 after the predetermined curing period has elapsed, reduces the jack 17 that supports the large pulling material 18 and removes the large pulling material 18 (FIG. 5A). While supporting the horizontal connection rod 15b of the assembly frame 13 with the arm 22a of the lifting machine 22, the whole is raised to release the load of the tube 11 at the lower end of the assembly frame 13 acting on the jack base 1 ( 5 (b)), after pulling out the pin 7 of the jack base 1, the inner tube 3 is accommodated in the outer tube 4 and the tube body 11, and the insertion position of the pin 7 is changed to reduce the overall height of the assembly frame 13. (FIG. 5C).

  Thereafter, the arm 22a of the lifting machine 22 is lowered to lower the entire assembly frame 13, and it passes under the beam 23 and moves to another concrete placement area (FIG. 5 (d)).

  The jack base of the present invention can be widely applied not only to a tower-column-type assembly frame body but also to a support work in which a building frame is assembled into a unit shape, or to a general formwork support work or a scaffold work. .

It is a front view at the time of jack base use. It is a principal part expanded sectional view of a jack base. It is an expanded sectional view which shows the III-III cross section of FIG. It is a perspective view of a formwork support work. It is explanatory drawing which shows the process at the time of the movement of a formwork support.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jack base 2 Bottom plate 3 Inner tube 3a Pin hole 4 Outer tube 4a Long hole 4b Male screw 5 Annular body with a handle 6 Connection member 7 Pin 8 Connection pipe 9 Plate material 10 Fastening bracket 11 Tube body

Claims (5)

A jack base arranged at the bottom of an assembly frame for formwork support,
An inner tube projecting from the bottom body, an outer tube into which the inner tube is loosely inserted, an annular body with a handle screwed into a male screw formed on the outer surface of the outer tube, and an upper outer surface of the outer tube And a connecting member fixed to
This connecting member holds the lower peripheral surface of the tubular body constituting the assembly frame,
A plurality of pin holes are formed in the inner tube at appropriate intervals, and a long hole is formed in the outer tube, and one of the plurality of pin holes and the long hole are formed. The pin is inserted,
The jack base according to claim 1, wherein a lower surface of the annular body with a handle is in contact with the pin by a load of the tubular body . The jack base according to claim 1, wherein a lower surface of the tubular body is in contact with a top surface of the outer tube. The jack base according to claim 1 or 2, wherein the inner pipe has a length reaching the inside of the pipe body. The jack base according to any one of claims 1 to 3, wherein the connection member includes a connection pipe into which the pipe body is inserted, a plate material that stands on an upper surface of the connection pipe and comes into contact with the pipe body, and the plate material. A jack base comprising a fastener for locking the tubular body. A jack base at the bottom of the unitized assembly frame, in the mold shoring placing height adjusting member and Obiki material on top, the formwork shoring by reducing the jack base concrete after casting After reducing the overall height, in the construction method of the formwork support that moves to another area while holding the formwork support by a lifting machine, etc.,
Rise above the jack base using a jack base according to claim 1, by reducing the height adjusting member to remove the Obiki material during dismantling, while supporting the entire formwork shoring in the crane or the like And releasing the load of the tube acting on the jack base, and inserting the pin inserted into one of the plurality of pin holes into another pin hole, thereby mold shoring method construction, characterized in that to reduce the outer pipe and accommodated in the formwork shoring overall height to said tube body.

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