JPH0216830B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for laying a prestressed sheath in a slipform system.

Conventionally, the slipform construction method has been used in the construction of tower-like structures such as television towers, observation towers, and very high chimneys.

Fig. 1 shows an example of the structure of the slipform system used in the slipform construction method described above, in which a yoke 2 is provided on each of the horizontal beams 1, which are called horizontal reference beams, and are provided in a radial manner. A cylindrical or polygonal cylindrical formwork 3 is provided at the bottom of these yokes 2, and a hydraulic or electric main jack 4 is provided at the center of the formwork, facing the upper opening of the formwork. It has a general structure in which a rod 5, which penetrates the inside of the formwork 3 in the length direction and is supported by the ground or the like, is held therethrough.

Then, concrete is poured into the formwork 3, reinforcement is placed on the upper part during the curing period of the concrete, and then the main jack 4 is operated to raise the formwork 3, and then the formwork 3 is raised. By sequentially repeating the process of pouring the upper layer of concrete into the formwork 3, the tower-like structure B of the desired height is created.
is beginning to form.

On the other hand, in the construction of the above-mentioned tower-like structure B, a prestressed structure is frequently adopted as the tower structure B becomes larger.

By the way, if the work for creating such a prestressed structure is attempted to be carried out in parallel with the above-mentioned slip form construction method, the following problems will occur.

That is, when installing the prestress sheath 6 necessary for making the prestress structure, as shown by the chain line in FIG. There are many operations for inserting the reinforcing bars 7 into the area surrounded by the yoke 2 and the reinforcing bars 7, which must be carried out around the entire circumference of the formwork 3 for each yoke 2. This is a problem in that the work has to be done from the outside of the reinforcing bar 7, making the work complicated.

This invention was made in order to cope with the above-mentioned circumstances, and its purpose is to provide an endless chain above the formwork along the circumferential direction of the formwork, and to apply a prestress sheath to the endless chain. The prestress sheath in the slipform system can be easily and reliably installed by locking one end and moving the endless chain along the circumferential direction of the formwork. The purpose of the present invention is to provide laying equipment.

The present invention will be explained below based on an embodiment shown in FIGS. 3 to 9. In the following explanation, the same reference numerals are used for parts common to FIGS. 1 and 2 to simplify the explanation.

As shown in FIG.
A large number of guide portions 8 are provided at intervals in the circumferential direction, and one end portion of a prestress sheath 6 that is provided in an annular shape surrounding these guide portions 8 and laid above the formwork 3 is engaged. A basic system comprising an endless chain 9 that is removably attached, and a drive mechanism 10 that pulls the prestressed sheath 6 along the circumferential direction of the formwork 3 by moving the endless chain 9 in its length direction. It is structured as follows.

Next, to explain these details, as shown in FIG.
The yoke 2 supporting the formwork 3 is provided at the lower part of the beam 11 along the radial direction of the formwork 3 so as to be located between both reinforcing bars 7, 7, and as shown in FIG. It is composed of a vertical roller 12 along the direction and a horizontal roller 13 along the radial direction of the formwork 3, and the support member 14 allows the horizontal roller 13 to move more in the radial direction of the formwork 3 than the vertical roller 12. It is rotatably and integrally attached to the beam 11 so as to be positioned outward. Further, these vertical rollers 12 and horizontal rollers 13 are
As shown in the figure, they are partially overlapped in the circumferential direction of the formwork 3.

As shown in FIGS. 3, 5, and 6, the endless chain 9 is constructed by connecting roller chains in an annular manner, and is placed on the horizontal rollers 13 of the guide section 8. By having the radius regulated by vertical rollers 12, they are supported above the formwork 3 so as to face each other over the entire circumference of the formwork 3.

Further, the endless chain 9 is formed to be longer than the shortest distance connecting each of the vertical rollers 12, and the extra length is extended to the support plate 15 provided between the horizontal beams 1, as shown in FIG. attached 2
This endless chain 9
A diameter adjusting portion 9a is formed.

One sprocket 16 of this diameter adjustment part 9a
is rotatably attached to the support plate 15, and constitutes the drive mechanism 10 together with an electric motor 18 that rotationally drives the sprocket 16. Further, the other sprocket 17 of the diameter adjusting portion 9a is slidably fixed in a guide groove 19 formed in the support plate 15 along the circumferential direction of the formwork 3 and at an arbitrary position. By moving it along this guide groove 19, the length of the folded portion can be adjusted and the diameter of the endless chain 9 can be adjusted (see FIG. 7).

The fixing structure of the other sprocket 17 is such that a bearing, etc. that supports the rotating shaft of this sprocket 17 is slidably fitted into the guide groove 19, and a space is provided between the bearing, etc. and the support plate 15. A locking/disengaging mechanism (not shown) for locking/unlocking may be provided, or a spring (not shown) may be stretched between the bearing, etc. and the support plate 15, and the spring may cause the bearing, etc. Various structures are conceivable, such as one in which the folded portion always bounces in the direction of increasing length.

On the other hand, the prestress sheath 6 that is removably attached to the endless chain 9 is attached to the bobbin 20 that is rotatably attached to the support plate 15.
One end pulled out from the bobbin 20 is locked to the endless chain 9 via a locking tool 21, as shown in FIGS. 3 and 8.

As shown in FIG. 8, this locking tool 21 has a locking rod 22 protruding from one end that is inserted between the rollers of the endless chain 9, and a locking rod 22 that is inserted between the rollers of the endless chain 9 at the other end. A locking portion 21a having a locking hole 23 that is bent in a direction opposite to the protruding direction of the prestressed sheath 6 and into which one end of the prestressed sheath 6 is inserted and locked.
is formed.

Next, a case in which a prestress sheath is laid along the upper part of the formwork 3 using the prestress sheath laying apparatus of this embodiment configured as described above will be described below.

First, pull out the prestress sheath 6 from the bobbin 20 and insert the end of the prestress sheath 6 into the locking hole 21 of the locking tool 21.
By inserting and locking the end of the prestress sheath 6 into the endless chain 9 by inserting the locking rod 22 of the locking tool 21 between the rollers of the endless chain 9 as shown in FIGS. Lock as shown in Figure 8.

Next, the electric motor 18 of the drive mechanism 10 is activated to rotate one sprocket 16 in the direction of the arrow in FIG. 7, thereby moving the endless chain 9 in the direction of the arrow in FIG.

As the endless chain 9 moves, the locking tool 21 is attached to the endless chain 9.
The prestress sheath 6, which is locked through the The formwork 3 is pulled while being successively inserted through the enclosed area.
The cable will be laid over the entire upper circumference.

On the other hand, the locking tool 21 is attached to the prestressed sheath 6
When the stopper 21 is rotated along the upper part of the formwork 3 together with the end thereof, the stopper 21 approaches the other sprocket 17, as shown in FIG. 9A. As the endless chain 9 continues to move, the other sprocket 17 meshes with the endless chain 9, and as shown in FIG. 9B, the other sprocket 17 locks the endless chain 9. The locking rod 22 of the locking tool 21 that is being held is pressed and released from the endless chain 9, whereby the locking tool 21 is released from the endless chain 9.

Therefore, the pulling of the prestressed sheath 6 is stopped when the prestressed sheath 6 has been pulled around the entire circumference of the formwork 3, so that the prestressed sheath 6 of a desired length can be laid.

After the prestress sheath 6 installed in this way is separated from the horizontal roller 13, it is temporarily fixed to the reinforcing bars 7, etc.
It is arranged above the formwork 3.

Then, by intermittently performing upward movement of the formwork 3 and repeatedly carrying out the installation work of the prestressed sheath 6 described above while stopping the upward movement, the movement range of the formwork 3,
That is, a desired number of prestress sheaths 6 can be laid within the concrete placement height for each step.

On the other hand, even when changing the diameter of the formwork 3 by moving the yoke 2 along the length direction of the horizontal beam 1 in order to change the casting diameter of the concrete C, the diameter adjustment By the action of the part 9a, that is, by sliding the other sprocket 17 to adjust the length of the folded part of the endless chain 9, the diameter of the endless chain 9 can be adjusted to follow the change in the diameter of the formwork 3. Can be easily adjusted.

In the above-mentioned embodiments, an example was described in which the guide section 8, the endless chain 9, the drive mechanism 10, etc. were provided in one system, but the present invention is not limited to this. It is also possible to provide a plurality of systems and install a plurality of prestressed sheaths 6 at the same time.

As explained above, the prestress sheath installation device for the slipform system according to the present invention includes a large number of guide parts provided at intervals in the circumferential direction at positions spaced apart above the formwork for the slipform system. , an annular endless chain for pulling the prestress sheath provided so as to surround these guide parts, a drive mechanism for moving this endless chain in its length direction, and a drive mechanism attached to one end of the prestress sheath. , a locking tool that is removably engaged with the endless chain, and the locking tool is inserted between the rollers of the endless chain and constitutes the drive mechanism as the endless chain moves. It is characterized in that it is engaged through a locking rod that is released from engagement by a sprocket, and has the following excellent effects.

By locking the end of the prestress sheath to the endless chain and moving the endless chain in its length direction, the prestress sheath can be laid over the entire circumference above the formwork. , the prestressed sheath can be easily and quickly installed in a narrow area above the formwork.

The prestress sheath and endless chain can be locked by inserting the locking rod of the locking tool attached to one end of the prestress sheath into the gap between the pins of the endless chain, making the operation simple. Also from this point of view, the installation work of the prestressed sheath can be carried out quickly.

When one end of the prestressed sheath has been routed to the end of the installation area, the locking rod of the locking device attached to this prestressed sheath is released from the endless chain by the sprocket of the drive mechanism. , the pulling of the prestress sheath is automatically stopped, and excessive pulling can be reliably prevented.

[Brief explanation of drawings]

In the drawings, FIGS. 1 and 2 show an example of the structure of the slipform system, with FIG. 1 being a vertical sectional view showing the outline of the overall structure, and FIG. 3 to 9 show one embodiment of the present invention, in which FIG. 3 is a plan view schematically showing the overall structure, FIG. 4 is a view similar to FIG. 2, and FIG.
The figure is a detailed view of the V section in Figure 4, Figure 6 is a sectional view taken along the - line in Figure 5, Figure 7 is an enlarged plan view for explaining the diameter adjustment mechanism, and Figure 8 is the 3 is a detailed view of the portion shown in FIG. 3, and FIG. 9 is a schematic diagram showing a state in which the prestressed sheath is removed from the endless chain. 1...Horizontal beam, 2...Yoke, 3...Formwork, 4
... Main jack, 5 ... Rod, 6 ... Prestress sheath, 8 ... Guide section, 9 ... Endless chain, 9a ... Diameter adjustment section, 10 ... Drive mechanism,
11... Beam, 12... Vertical roller, 13... Horizontal roller, 14... Support member, 15... Support plate, 16...
... Sprocket, 17... Sprocket, 18...
...Electric motor, 19...Guide groove, 21...Locking portion.

Claims (1)

[Claims] 1. A number of guide parts provided at intervals in the circumferential direction at positions spaced apart above the formwork for the slip form system, and an annular endless ring for pulling the prestress sheath provided to surround these guide parts. a chain, a drive mechanism for moving the endless chain in its length direction, and a locking tool attached to one end of the prestressed sheath and detachably engaged with the endless chain; The locking device is inserted between the rollers of the endless chain, and
A device for laying a prestress sheath in a slipform system, characterized in that the prestress sheath is engaged via a locking rod that is released from engagement by a sprocket that constitutes the drive mechanism as the endless chain moves. .