JPH048198Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application field>> This invention relates to guiding vertical reinforcing bars in the slipform construction method.

《Prior art》 As shown in Fig. 1A, the slip form construction method uses a slip form formwork 1-1 arranged in an annular shape.
This is a method of constructing reinforced concrete structures such as silos and super-high chimneys by continuously pouring concrete using rods 3-3 embedded in concrete 2 as pillars and gradually raising them with jacks 4-4. .

By the way, in this slipform construction method, it is necessary to assemble the reinforcing bars as the formwork rises, and at that time, the vertical reinforcing bars 5 always protrude above the horizontal reinforcing bars (not shown), so a steady rest is required. .

The upper part of the vertical reinforcing bar 5-5 is placed on the upper work floor 6 to prevent it from swinging by inserting the vertical reinforcing bar 5 into the squares of the wire mesh 7 shown in FIG. 1B. The effect has been fully achieved.

On the other hand, in the lower part of the vertical reinforcing bars 5-5, it is necessary to maintain or change the spacing between the vertical reinforcing bars depending on the thickness, slope, diameter, etc. of the wall. U on guide 9 and square pipe
Vertical reinforcing bars 5 were placed in each node of the guide 13 to which bolts were attached.

The comb-shaped guide 9, as shown in FIG. The vertical reinforcing bars 5 were placed horizontally above the yoke legs 12 at the upper ends of the yoke legs 12, and the vertical reinforcing bars 5 were inserted between the short bars 11-11.

On the other hand, guide 1 with U bolts attached to the square pipe
3 is a curved square pipe 14 as shown in FIG.
U-bolt mounting holes are drilled at regular intervals on the inside and outside of the yoke leg 12, and U-bolts 15 are installed in the mounting holes. -1 was placed horizontally above the U-bolts 15, and the vertical reinforcing bars 5 were inserted into each U-bolt 15 from its lower end.

<<Problems to be solved by the invention>> However, in the comb-shaped guide 9, the vertical reinforcing bars 5 easily come off from the ends of the short bars 11, so that the vertical reinforcing bars cannot be guided sufficiently. Since they are integrally fixed by welding or the like, there is a drawback that if the pitch of the vertical reinforcing bars 5 changes, it cannot be adequately accommodated.

In addition, in the guide 13 in which the U bolt 15 is attached to the square pipe 14, when changing the pitch of the U bolt 15, the U bolt must be replaced, and this work is complicated and takes a long time. Furthermore, changes in the pitch of the U-bolts are restricted to the positions of the U-bolt mounting holes, making it impossible to make fine adjustments corresponding to variations in the pitch of the vertical reinforcing bars 5.

This idea was made in view of these problems, and its purpose is to be able to easily and accurately change the pitch of the vertical reinforcing bars in response to variations in pitch, and to make it possible to easily and accurately change the pitch of the longitudinal reinforcing bars in the horizontal direction. The purpose is to provide a guide for the longitudinal reinforcing bars that will not slip out.

《Means for solving the problem》 In order to achieve the above object, the vertical reinforcing bar guide in the slipform construction method according to this invention is a type such as an angle that is installed approximately horizontally on the upper part of the formwork of the slipform device. It consists of a frame and a large number of reinforcing bar guide means that can be attached to and detached from the shape material, and each reinforcing bar guide means includes a bent plate material fitted to the shape material and a flat surface U fixed to one outer surface of the plate material. attached to the letter-shaped member and the other outer surface of the plate,
and a fastener that can freely fasten the plate material to the shape material.

《Operation》 When trying to change the pitch of vertical reinforcing bars when connecting new upper vertical reinforcing bars to the upper ends of lower vertical reinforcing bars buried in concrete that has already been placed, tighten the reinforcing bar guide means. The tool is loosened, the reinforcing bar guide means is appropriately moved along the shape material, and after a predetermined interval is determined, the fastener is tightened to fix the reinforcing bar guide means to the shape material.

The above-mentioned pitch changing work can be performed not only with the vertical reinforcing bars still inserted, but also while pouring concrete and sliding the formwork upward. Then, when the working height of the middle work floor reaches the upper end of this vertical reinforcing bar, a new vertical reinforcing bar is added. Incidentally, if it is necessary to change the pitch of the vertical reinforcing bars, the reinforcing bar guide means is moved again along the shape material at any time to set the pitch to a predetermined pitch, and the above operation is repeated.

<<Examples>> Hereinafter, preferred embodiments of this invention will be described with reference to the accompanying drawings.

FIGS. 2 to 4 show an embodiment of the vertical reinforcing bar guide according to this invention.

FIG. 2 is a cross-sectional view in the circumferential direction of the formwork showing the vertical reinforcing bar guide 20 of the present invention installed in a slipform device. 20 is Yokretsugu 1
It is held along the circumferential direction of the mold frame 1-1 toward the inside of the opposing mold frame 1-1 by a guide holding piece 21 fixed to the upper end of the mold frame 1-1.

The guide 20 according to the present invention is made up of a shaped steel 22 made of angle material or the like as shown in FIG. 3A, and a large number of reinforcing bar guide fittings 23 as shown in FIG. It is configured.

This shaped steel 22 is curved with approximately the same radius of curvature as the slipform form 1, and is horizontally attached to the upper end of the yoke leg 12 by a guide holding piece 21, as shown in FIG. In this installed state, the shape steel 22
The vertical surface portion 22a is substantially parallel to the formwork 1.

On the other hand, the reinforcing bar guide hardware 23 has a bent iron plate 24 which is curved into an inverted U shape.
The curved groove 25 is adapted to be fitted into the vertical surface portion 22a of the shaped steel 22. Both ends of a planar U-shaped guide reinforcing bar 26 are integrally joined to one outer surface of the bent iron plate 24 by welding, and a through hole is bored in the other outer surface, and a through hole is formed coaxially with the through hole. A nut 27 is fixed to the nut 27, and a bolt 2 is attached to this nut 27.
8 are screwed together. Therefore, by rotating the bolt 28 in the forward and reverse directions, the tip of the bolt 28 can freely move in and out of the groove 25 of the bent iron plate 24.

When in use, attach the shaped steel 22 to the yoke leg 12.
The vertical surface portion 22a of this steel mold 22 is attached to the upper end of the
grooves 25 in the bent iron plate 24 of the guide hardware 23.
When the guide metal fittings 23 are placed at predetermined intervals and the bolts 28 are tightened, the tips of the bolts 28 are crimped onto the mold steel 22, and the guide metal fittings 23 are fixed on the mold steel 22 while maintaining the predetermined spacing. Ru. Next, the lower end of the vertical reinforcing bar 5 is lowered through the wire mesh 7 of the upper work floor 6 and passed through the U-shaped guide reinforcing bar 26 of the guide hardware 23. Thereafter, while pouring concrete, the slipform device is raised by operating the jack 4-4. Then, the above-mentioned guide hardware 23 is attached to the formwork 1
Because they are arranged at a predetermined pitch in the circumferential direction of
As described above, the vertical reinforcing bars 5 are
Since they are guided by the letter-shaped guide reinforcing bars, a large number of vertical reinforcing bars 5 are arranged at a predetermined pitch.

When the upper end of the lower vertical reinforcing bar protruding from the upper end of the concrete 2 that has already been placed reaches an appropriate position on the middle work floor 8 due to the lift of the slipform device, a new wire mesh is passed through the upper work floor and The vertical reinforcing bars are lifted up and tied to the vertical reinforcing bars below on the middle work floor 8 to form a lap joint.

In this way, while the upper and lower vertical reinforcing bars are integrally connected, the formwork 1 is moved by operating the jack 4-4.
-1 is raised and concrete is poured.

Next, when it becomes necessary to change the pitch of the vertical reinforcing bars 5 as the formwork 1-1 rises, the bolts 28 screwed into the nuts 27 of each guide hardware 23 are rotated in the opposite direction. Release the tip of each guide fitting 23 from the crimping against the mold steel 22.
is made movable relative to the shaped steel 22, and each guide hardware 23 is moved in accordance with the fluctuation of the pitch of the vertical reinforcing bars 5. Then, at that position, each guide hardware 23
By rotating the bolts 28 in the forward direction, the tips of the bolts 28 are crimped onto the molded steel 22, and each guide metal fitting 2 is
3 is fixed to the shaped steel 22.

In addition, when the pitch of the vertical reinforcing bars 5 is reduced, it is also when the radius of the formwork 1 is reduced, so in this case, adjacent mold steels 22 may collide with each other. In this case, as shown in FIG. 4, by making the adjacent steel molds 22 different in height and arranging them symmetrically in the vertical direction, it is possible to prevent the adjacent steel molds 22 from colliding with each other.

《Effects of the invention》 The present invention allows the reinforcing bar guide means to be attached to and detached from a profile such as an angle by loosely tightening the fastener attached to the reinforcing bar guide means, so it is extremely easy to change the pitch of the reinforcing bar guide means. And it can be done in a short time.

In addition, the reinforcing bar guide means can be attached to and removed from the shape material such as an angle by loosening and tightening the fasteners attached to the reinforcing bar guide means, so it is possible to fix the reinforcing bar guide means at any position on the shape material. This makes it possible to finely adjust the pitch of the reinforcing bar guide means in response to variations in the pitch of the vertical reinforcing bars 5.

Furthermore, since the longitudinal reinforcing bars are inserted into the planar U-shaped member, they do not come out laterally from the longitudinal reinforcing bar guide.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the slipform construction method, Figure A is its overall view, Figure B is a plan view showing the wire mesh used to steady the upper part of the vertical reinforcing bars, and Figure 2 is a diagram of the method of the present invention. FIG. 3 is a cross-sectional view in the circumferential direction of the formwork showing a vertical reinforcing bar guide according to an embodiment attached to a slip form device; FIG. 3 is a perspective view showing the components of the guide according to an embodiment of the present invention; Figure A is a perspective view of the shaped steel, Figure B is a perspective view of the reinforcing bar guide hardware, Figure 4 is a diagram showing a method of avoiding the case where adjacent shaped steel overlaps, and Figure A is a vertical reinforcing bar guide. FIG. 5 is a perspective view of a conventional reinforcing bar guide, and FIG. 6 is a perspective view of another conventional reinforcing bar guide. DESCRIPTION OF SYMBOLS 1...Formwork, 5...Vertical reinforcing bar, 12...Yoke leg, 20...Vertical reinforcing bar guide, 21...Guide holding piece, 22...Shape steel, 23...Reinforcing bar guide hardware,
24...Bent iron plate, 26...Guide reinforcing bar, 27...
...Natsuto, 28...Boruto.

Claims (1)

[Scope of utility model registration request] It consists of a shape material such as an angle that is installed approximately horizontally on the upper part of the formwork of the slip form device, and a number of reinforcing bar guide means that can be attached to and detached from the shape material, and each reinforcing bar guide means is fitted into the shape material. It consists of a bent plate, a planar U-shaped member fixed to one outer surface of the plate, and a fastener attached to the other outer surface of the plate to allow the plate to be fastened to the profile. Vertical reinforcing bar guide in the slip form construction method.